US20030175091A1 - Floating captive screw - Google Patents
Floating captive screw Download PDFInfo
- Publication number
- US20030175091A1 US20030175091A1 US10/364,828 US36482803A US2003175091A1 US 20030175091 A1 US20030175091 A1 US 20030175091A1 US 36482803 A US36482803 A US 36482803A US 2003175091 A1 US2003175091 A1 US 2003175091A1
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- United States
- Prior art keywords
- ferrule
- screw
- collar
- captive screw
- head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- 230000035515 penetration Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B41/00—Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
- F16B41/002—Measures against loss of bolts, nuts or pins
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/24—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
- F16B31/04—Screwed connections specially modified in view of tensile load; Break-bolts for maintaining a tensile load
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/041—Specially-shaped shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
- F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
- F16B5/0266—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread using springs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
- Y10S411/999—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener with retainer, e.g. tether
Definitions
- the present invention relates generally to captive screws.
- Captive screws are screws that are “captivated” or held within a collar or ferrule.
- the ferrule is mounted in a first panel or like object.
- the screw portion is captivated so that it can be moved perpendicular to the first panel and the screw's threads can engage a corresponding aperture in a second panel, so that the first and second panels can be secured together.
- the panels are unscrewed and disengage, the screw is retained in the first panel.
- Captive screws are useful in applications where it is important to avoid dropping or losing screws during assembly or repair, such as electronic devices, where a lost screw can cause catastrophic electrical shorts damaging equipment.
- One particular application for captive screws is to hold down a heat sink which is mounted on top of a microchip and is intended to dissipate the heat of the microchip.
- the microchip in turn, is fastened to a circuit board.
- a compressible or elastic material in the form of the sheet is placed between the heat sink and the microchip. If one were to put the heat sink directly on top of the microchip, there would be tiny gaps between the two. Since air conducts heat poorly, these gaps have a detrimental effect on heat transfer.
- This interface material in the form of a sheet is needed and the sheet has a high thermal conductivity.
- microchips during operation have been getting warmer and warmer as space has been getting more and more limited on circuit boards.
- the captive screw should be able to pass stringent vibration testing and be able to allow for thermal expansion.
- the present invention solves the problem of providing for secure fastening of a lower panel to an upper panel while providing a constant pressure on an upper panel to which the captive screw is captive.
- a captive screw which includes a ferrule, a screw, and a spring.
- the screw has a head, a shank adapted to pass through the ferrule, a threaded portion at the end of the shank opposite the head, and a collar formed on the shank proximate the threaded portion.
- the screw is captivated on the ferrule between the head and the collar.
- the spring extends on the shank of the screw between the head and the ferrule.
- the ferrule has a generally cylindrical exterior surface having a plurality of knurls for securing the captive screw in a preformed aperture in a first structure, such as a lever.
- the ferrule be formed with an inner ring formed on the interior surface of the ferrule having a generally circular opening large enough to permit the threads collar the screw to pass through but not large enough to permit the spring to pass through.
- the ferrule has an annular lip and an exterior circumferential exterior groove.
- the annular lip and exterior groove permit the captive screw to be press fit in a structure.
- the ferrule of the captive screw has a first and a second annular lip which provide for the captive screw to be pressed into a structure.
- a captive screw which has a collar connected to the shank of the screw in the proximity of the threaded portion of the screw.
- the collar has outwardly extending legs.
- FIG. 1 is a side elevational view of a first embodiment of a captive screw according to the present invention, partially in section in a heat sink and a circuit board.
- FIG. 2 is an exploded perspective view of a first embodiment of the screw of the captive screw of FIG. 1.
- FIG. 3 is a side elevational cross-sectional view of the captive screw of FIG. 1 in an unfastened position.
- FIG. 4 is a side elevational cross-sectional view of the captive screw of FIG. 1 in a fastened position.
- FIG. 5 is a side view of the captive screw of FIG. 1 in a fastened position.
- FIG. 6 is an isometric view of the captive screw of FIG. 1 in a fastened position.
- FIG. 7 is a side view of the captive screw of FIG. 1 in an unfastened position.
- FIG. 8 is a perspective view of the captive screw of FIG. 1 in an unfastened position.
- FIG. 9 is a top plan view of the captive screw of FIG. 1.
- FIG. 10 is a side view of the screw in the captive screw of FIG. 1.
- FIG. 11 is a perspective view of the screw in the captive screw of FIG. 1.
- FIG. 12 is a perspective view of the spring in the captive screw of FIG. 1.
- FIG. 13 is a top view of the ferrule in the captive screw of FIG. 1.
- FIG. 14 is a side view of the ferrule in the captive screw of FIG. 1.
- FIG. 15 is a perspective view of the ferrule in the captive screw of FIG. 1.
- FIG. 16 is a side elevational view of a second embodiment of the captive screw of the present invention partially in section.
- FIG. 17 is a side view of a third embodiment of the captive screw of the present invention.
- FIG. 18 is a side elevational view of the captive screw of FIG. 17 partially in section in a structure.
- FIG. 19 is a side elevational view of a fourth embodiment of a captive screw according to the present invention, partially in section in a heat sink and a circuit board.
- FIG. 20 is a side elevational view of the captive screw of FIG. 19 partially in section in a structure.
- FIG. 21 is a perspective view of the captive screw of FIG. 19.
- FIG. 22 is a side elevational view of the captive screw of FIG. 19.
- FIG. 23 is a bottom view of the captive screw of FIG. 19.
- FIG. 24 is a perspective view of the collar of the captive screw of FIG. 19.
- FIG. 25 is a perspective view of the collar of the captive screw of FIG. 19.
- the present invention provides a captive screw for securing a first structure such as a first panel or heat sink to a second structure such as a circuit board.
- FIG. 1 a captive screw 10 according to the present invention.
- the captive screw 10 includes a ferrule 20 , a screw 40 and a spring 50 .
- the screw 40 (FIG. 2) includes a head 42 adapted to receive a driver (FIG. 3), a shank 44 adapted to pass through the ferrule 20 , and a threaded portion 46 at the end of the shank 44 opposite the head 42 .
- the 40 screw also includes a collar 48 formed on the shank 44 proximate the threaded portion 46 .
- the generally cylindrical ferrule 20 can have a plurality of knurls formed on its exterior cylindrical surface for securing the captive screw 10 in a preformed aperture 102 in a first structure 100 such as a heat sink by a press fit.
- the threaded portion 46 of the screw 40 is intended for securing the captive screw 10 in a preformed, threaded aperture 112 formed in second structure 110 such as a circuit board shown in FIG. 1 having a chip 5 .
- the chip is shown on a sheet 6 of flexible material which absorbs vibrations.
- the captive screw 10 is positioned precisely relative to the second structure by virtue of the collar 48 formed on the shank 44 of the screw 40 .
- the collar 48 limits the depth of penetration of the screw 40 into a threaded insert 7 which has been inserted from the bottom of the circuited board 112 .
- the threaded portion of the captive screw can be screwed directly into a preformed, threaded aperture in a second structure. By coming into contact with the threads of threaded insert 7 , the screw 40 is being rotationally driven into the second structure.
- the ferrule 20 is formed with an annular ring section 24 .
- the captive screw 10 is assembled by placing the spring 50 on the screw 40 and then passing the screw 40 through the ferrule 20 .
- the annular ring 24 on the interior surface of the ferrule is large enough to permit the threads 46 of the screw 40 to pass through but not large enough to permit the spring 50 to pass through.
- pressure can be applied uniformly on the generally cylindrical portion of the ferrule and plastic deformation can form the annular ring 24 .
- the ferrule Prior to the pressure being applied to the ferrule the ferrule can have an annular circumferential groove which allows for the formation of the ring section.
- the annular ring section 24 reduces the size of the opening in the ferrule so that the resultant opening is slightly larger than the diameter of the screw shaft 44 but smaller than both the screw head diameter and the diameter of the collar, thus captivating the screw 40 on the ferrule 20 in between the screw head 42 and the collar 48 .
- the collar can be rolled onto the screw after the screw has been inserted into the ferrule. After installation of the ferrule into the first structure 100 the end of the ferrule can be flared.
- the ferrule 20 also has an annular lip 28 or stop formed on the exterior cylindrical surface proximate the top of the ferrule 20 for limiting the penetration of the ferrule 20 in the preformed aperture 102 in the first structure 100 .
- the collar 48 precisely limits the vertical position of the screw 40 above the second structure 110 , while the first structure 100 floats above the second structure 110 , while being urged towards the second structure 110 by the spring 50 of the captive screw 10 .
- FIG. 6 is a perspective view of the captive screw of the first embodiment of the invention showing the position of the screw when the screw is in a fastened position.
- FIG. 8 is a perspective view of the captive screw of the first embodiment of the invention showing the position of the screw when the screw is in a fastened position.
- the ferrule 120 also has an annular lip 38 or stop formed on the exterior cylindrical surface proximate the top of the ferrule 120 for limiting the penetration of the ferrule 120 in the preformed aperture 102 in the first structure, as well as an annular circumferential groove 30 formed in the exterior cylindrical surface of the ferrule immediately adjacent and below the annular lip 38 , for receiving the plastic flow of material 104 when the ferrule 120 is pressed into the preformed aperture.
- the collar 48 precisely limits the vertical position of the screw 40 above the second structure (not shown), while the first structure 100 floats above the second structure, while being urged towards the second structure by the spring 50 of the captive screw 310 .
- the captive screw shown in FIG. 1 can be pressed into the underside of the first structure from the bottom. Alternately, the captive screw shown could be installed from the top when groove 30 is placed near the bottom of the first structure 30 .
- the collar of the second embodiment can be shaped as part of the screw after the screw has been inserted in the ferrule.
- the ferrule 220 also has a first annular lip 58 or stop formed on the exterior cylindrical surface proximate the top of the ferrule 220 for limiting the penetration of the ferrule 220 in the preformed aperture 102 in the first structure, as well as an annular circumferential groove 130 formed in the exterior cylindrical surface of the ferrule immediately adjacent and below the first annular lip 58 , for receiving the plastic flow of material 104 when the ferrule 220 is pressed into the preformed aperture.
- a second annular lip 68 is shown at the opposite end of the ferrule.
- the collar 48 precisely limits the vertical position of the screw 40 above the second structure (not shown), while the first structure 100 floats above the second structure, while being urged towards the second structure by the spring 50 of the captive screw 210 .
- the collar can be pressed on.
- FIGS. 19, 20, 21 and 22 show a captive screw in first structure 100 having a collar 148 which has outwardly extending legs and a base portion.
- the collar has outwardly extending legs 248 and the base portion 348 .
- the ends 448 of the legs 248 extend outwardly and define a collar cross section. Since the legs are flexible, the ends of the legs deform elastically and permit the collar to pass through a first structure when being passed through an aperture in a structure and the aperture has a smaller cross section than that defined by the ends of the legs.
- the arrangement shown in FIG. 19 is one way in which to install the collar 48 into a second structure 110 .
- the base portion 348 of the collar limits the penetration of the screw into the second structure. In the embodiment shown in FIG.
- the collar can be in the shape of a crown and the collar can be threaded on, crimped on or pressed on, etc.
- the legs are also dimensioned and configured to not allow the spring to pass over the legs.
- the collar shown and described in the first three embodiments can be rolled on pressed on or screwed on.
- the screw in the above embodiments includes a generally cylindrical head 42 having a central recess 34 formed therein and adapted to receive a driver. While a Phillip-type driver recess is illustrated, other types of driver recesses, such as slotted, Torx®, hexagonal, and the like, and combinations thereof (e.g. slot-Torx), can also be used.
- a generally cylindrical upper section extends coaxially downward from the head 42 .
- the screw, and ferrule are formed from a suitable metallic material such as aluminum.
- ferrule of the present invention is adapted to be press fit into the first structure
- other means of mounting the captive screw on the structure can be employed, including conventional installation methods known as “flare-in,” “floating,” “p.c. board,” and “snap-in” installation methods.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
- Bolts, Nuts, And Washers (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
A captive screw for securing together two panels has a screw and a spring extending between the screw head and a ferrule. A collar is formed on the screw shank under the ferrule to limit penetration of the screw threads in a bottom panel so that the upper panel floats on the spring.
Description
- This application claims the benefit of U.S. patent application Ser. No. 09/803,221 filed Mar. 9, 2001, entitled floating captive screw which is based on U.S. Provisional Application No. 60/188,406 filed Mar. 10, 2000.
- 1. Field of the Invention
- The present invention relates generally to captive screws.
- 2. Brief Description of the Prior Art
- Captive screws are screws that are “captivated” or held within a collar or ferrule. The ferrule is mounted in a first panel or like object. The screw portion is captivated so that it can be moved perpendicular to the first panel and the screw's threads can engage a corresponding aperture in a second panel, so that the first and second panels can be secured together. However, when the panels are unscrewed and disengage, the screw is retained in the first panel. Captive screws are useful in applications where it is important to avoid dropping or losing screws during assembly or repair, such as electronic devices, where a lost screw can cause catastrophic electrical shorts damaging equipment.
- One particular application for captive screws is to hold down a heat sink which is mounted on top of a microchip and is intended to dissipate the heat of the microchip. The microchip, in turn, is fastened to a circuit board. Oftentimes, between the heat sink and the microchip a compressible or elastic material in the form of the sheet is placed. If one were to put the heat sink directly on top of the microchip, there would be tiny gaps between the two. Since air conducts heat poorly, these gaps have a detrimental effect on heat transfer. This interface material in the form of a sheet is needed and the sheet has a high thermal conductivity. Recently, microchips during operation have been getting warmer and warmer as space has been getting more and more limited on circuit boards. Accordingly, heat sinks have been getting larger and larger as the requirements for withstanding vibrations has been getting more stringent. Standoffs have been used which rise from the board to which the heat sinks are screwed down. Difficulties encountered with standoffs have been that the standoffs do not compensate for chip height variation and they do not provide consistent compression of the interface material between the chip and the heat sink.
- In the past, various clamps, latches, pins, etc have been used to hold heat sinks down. Plastic clips have been used, however, this requires that the use of a screwdriver to screw in the clip directly onto the circuit board which makes the board susceptible to damage. Plastic clips, although they are not clostly, are limited by the weight of the heat sink and the clips have proven to be unreliable in vibration and drop shock testing. Some varieties of clips are clipped onto the heat sink at the ends of fins in the middle of the heat sink. Unfortunately, the middle fins are the most important fins in a heat sink as they carry most of the heat load. Therefore, when such clips are used the need for a larger heat sink results.
- Accordingly, a need exists for a captive screw which is captive or fixed to a first panel such as a heat sink whereby a collar on the screw bottoms out at a fixed distance on a lower panel when the screw is screwed into the lower panel thereby allowing the captive screw to provide a constant pressure on the top panel. In addition, the captive screw should be able to pass stringent vibration testing and be able to allow for thermal expansion.
- The present invention has been developed in view of the foregoing and to overcome the deficiencies of the prior art.
- The present invention solves the problem of providing for secure fastening of a lower panel to an upper panel while providing a constant pressure on an upper panel to which the captive screw is captive.
- In one embodiment of the present invention, a captive screw is disclosed which includes a ferrule, a screw, and a spring. The screw has a head, a shank adapted to pass through the ferrule, a threaded portion at the end of the shank opposite the head, and a collar formed on the shank proximate the threaded portion. The screw is captivated on the ferrule between the head and the collar. The spring extends on the shank of the screw between the head and the ferrule. Preferably, the ferrule has a generally cylindrical exterior surface having a plurality of knurls for securing the captive screw in a preformed aperture in a first structure, such as a lever. Is also preferred that the ferrule be formed with an inner ring formed on the interior surface of the ferrule having a generally circular opening large enough to permit the threads collar the screw to pass through but not large enough to permit the spring to pass through.
- In a second embodiment of this invention, the ferrule has an annular lip and an exterior circumferential exterior groove. Preferably, the annular lip and exterior groove permit the captive screw to be press fit in a structure.
- In a third embodiment of the present invention, the ferrule of the captive screw has a first and a second annular lip which provide for the captive screw to be pressed into a structure.
- In a fourth embodiment of the present invention, a captive screw is provided which has a collar connected to the shank of the screw in the proximity of the threaded portion of the screw. The collar has outwardly extending legs.
- FIG. 1 is a side elevational view of a first embodiment of a captive screw according to the present invention, partially in section in a heat sink and a circuit board.
- FIG. 2 is an exploded perspective view of a first embodiment of the screw of the captive screw of FIG. 1.
- FIG. 3 is a side elevational cross-sectional view of the captive screw of FIG. 1 in an unfastened position.
- FIG. 4 is a side elevational cross-sectional view of the captive screw of FIG. 1 in a fastened position.
- FIG. 5 is a side view of the captive screw of FIG. 1 in a fastened position.
- FIG. 6 is an isometric view of the captive screw of FIG. 1 in a fastened position.
- FIG. 7 is a side view of the captive screw of FIG. 1 in an unfastened position.
- FIG. 8 is a perspective view of the captive screw of FIG. 1 in an unfastened position.
- FIG. 9 is a top plan view of the captive screw of FIG. 1.
- FIG. 10 is a side view of the screw in the captive screw of FIG. 1.
- FIG. 11 is a perspective view of the screw in the captive screw of FIG. 1.
- FIG. 12 is a perspective view of the spring in the captive screw of FIG. 1.
- FIG. 13 is a top view of the ferrule in the captive screw of FIG. 1.
- FIG. 14 is a side view of the ferrule in the captive screw of FIG. 1.
- FIG. 15 is a perspective view of the ferrule in the captive screw of FIG. 1.
- FIG. 16 is a side elevational view of a second embodiment of the captive screw of the present invention partially in section.
- FIG. 17 is a side view of a third embodiment of the captive screw of the present invention.
- FIG. 18 is a side elevational view of the captive screw of FIG. 17 partially in section in a structure.
- FIG. 19 is a side elevational view of a fourth embodiment of a captive screw according to the present invention, partially in section in a heat sink and a circuit board.
- FIG. 20 is a side elevational view of the captive screw of FIG. 19 partially in section in a structure.
- FIG. 21 is a perspective view of the captive screw of FIG. 19.
- FIG. 22 is a side elevational view of the captive screw of FIG. 19.
- FIG. 23 is a bottom view of the captive screw of FIG. 19.
- FIG. 24 is a perspective view of the collar of the captive screw of FIG. 19.
- FIG. 25 is a perspective view of the collar of the captive screw of FIG. 19.
- The present invention provides a captive screw for securing a first structure such as a first panel or heat sink to a second structure such as a circuit board.
- Referring now to the drawings in detail, wherein like reference numerals indicate like elements throughout the several views, there is shown in FIG. 1 a
captive screw 10 according to the present invention. Thecaptive screw 10 includes aferrule 20, ascrew 40 and aspring 50. The screw 40 (FIG. 2) includes ahead 42 adapted to receive a driver (FIG. 3), ashank 44 adapted to pass through theferrule 20, and a threadedportion 46 at the end of theshank 44 opposite thehead 42. The 40 screw also includes acollar 48 formed on theshank 44 proximate the threadedportion 46. - The generally
cylindrical ferrule 20 can have a plurality of knurls formed on its exterior cylindrical surface for securing thecaptive screw 10 in a preformedaperture 102 in afirst structure 100 such as a heat sink by a press fit. The threadedportion 46 of thescrew 40 is intended for securing thecaptive screw 10 in a preformed, threadedaperture 112 formed insecond structure 110 such as a circuit board shown in FIG. 1 having achip 5. The chip is shown on asheet 6 of flexible material which absorbs vibrations. Thecaptive screw 10 is positioned precisely relative to the second structure by virtue of thecollar 48 formed on theshank 44 of thescrew 40. Thecollar 48 limits the depth of penetration of thescrew 40 into a threadedinsert 7 which has been inserted from the bottom of the circuitedboard 112. Alternatively, the threaded portion of the captive screw can be screwed directly into a preformed, threaded aperture in a second structure. By coming into contact with the threads of threadedinsert 7, thescrew 40 is being rotationally driven into the second structure. - As can be seen in the FIGS. 1, 3 and4, the
ferrule 20 is formed with anannular ring section 24. Thecaptive screw 10 is assembled by placing thespring 50 on thescrew 40 and then passing thescrew 40 through theferrule 20. Theannular ring 24 on the interior surface of the ferrule is large enough to permit thethreads 46 of thescrew 40 to pass through but not large enough to permit thespring 50 to pass through. When theferrule 20 is formed during assembly, pressure can be applied uniformly on the generally cylindrical portion of the ferrule and plastic deformation can form theannular ring 24. Prior to the pressure being applied to the ferrule the ferrule can have an annular circumferential groove which allows for the formation of the ring section. Theannular ring section 24 reduces the size of the opening in the ferrule so that the resultant opening is slightly larger than the diameter of thescrew shaft 44 but smaller than both the screw head diameter and the diameter of the collar, thus captivating thescrew 40 on theferrule 20 in between thescrew head 42 and thecollar 48. The collar can be rolled onto the screw after the screw has been inserted into the ferrule. After installation of the ferrule into thefirst structure 100 the end of the ferrule can be flared. - The
ferrule 20 also has an annular lip 28 or stop formed on the exterior cylindrical surface proximate the top of theferrule 20 for limiting the penetration of theferrule 20 in the preformedaperture 102 in thefirst structure 100. When the captive screw of 10 the present invention is installed, thecollar 48 precisely limits the vertical position of thescrew 40 above thesecond structure 110, while thefirst structure 100 floats above thesecond structure 110, while being urged towards thesecond structure 110 by thespring 50 of thecaptive screw 10. For example, FIG. 6 is a perspective view of the captive screw of the first embodiment of the invention showing the position of the screw when the screw is in a fastened position. FIG. 8 is a perspective view of the captive screw of the first embodiment of the invention showing the position of the screw when the screw is in a fastened position. - In the second embodiment of the invention as shown in FIG. 16, the
ferrule 120 also has anannular lip 38 or stop formed on the exterior cylindrical surface proximate the top of theferrule 120 for limiting the penetration of theferrule 120 in the preformedaperture 102 in the first structure, as well as an annularcircumferential groove 30 formed in the exterior cylindrical surface of the ferrule immediately adjacent and below theannular lip 38, for receiving the plastic flow ofmaterial 104 when theferrule 120 is pressed into the preformed aperture. When the captive screw of 310 the present invention is installed, thecollar 48 precisely limits the vertical position of thescrew 40 above the second structure (not shown), while thefirst structure 100 floats above the second structure, while being urged towards the second structure by thespring 50 of thecaptive screw 310. The captive screw shown in FIG. 1 can be pressed into the underside of the first structure from the bottom. Alternately, the captive screw shown could be installed from the top whengroove 30 is placed near the bottom of thefirst structure 30. Also, the collar of the second embodiment can be shaped as part of the screw after the screw has been inserted in the ferrule. - In the third embodiment of the invention as shown in FIGS. 17 and 18, the
ferrule 220 also has a firstannular lip 58 or stop formed on the exterior cylindrical surface proximate the top of theferrule 220 for limiting the penetration of theferrule 220 in the preformedaperture 102 in the first structure, as well as an annularcircumferential groove 130 formed in the exterior cylindrical surface of the ferrule immediately adjacent and below the firstannular lip 58, for receiving the plastic flow ofmaterial 104 when theferrule 220 is pressed into the preformed aperture. A secondannular lip 68 is shown at the opposite end of the ferrule. When the captive screw of 210 the present invention is installed, thecollar 48 precisely limits the vertical position of thescrew 40 above the second structure (not shown), while thefirst structure 100 floats above the second structure, while being urged towards the second structure by thespring 50 of thecaptive screw 210. In this embodiment of the present invention the collar can be pressed on. - In the fourth embodiment, FIGS. 19, 20,21 and 22 show a captive screw in
first structure 100 having acollar 148 which has outwardly extending legs and a base portion. The collar has outwardly extendinglegs 248 and thebase portion 348. The ends 448 of thelegs 248 extend outwardly and define a collar cross section. Since the legs are flexible, the ends of the legs deform elastically and permit the collar to pass through a first structure when being passed through an aperture in a structure and the aperture has a smaller cross section than that defined by the ends of the legs. The arrangement shown in FIG. 19 is one way in which to install thecollar 48 into asecond structure 110. Thebase portion 348 of the collar limits the penetration of the screw into the second structure. In the embodiment shown in FIG. 20 theends 448 of the legs contact the underside of the first structure. The collar can be in the shape of a crown and the collar can be threaded on, crimped on or pressed on, etc. The legs are also dimensioned and configured to not allow the spring to pass over the legs. - The collar shown and described in the first three embodiments can be rolled on pressed on or screwed on.
- The screw in the above embodiments includes a generally
cylindrical head 42 having a central recess 34 formed therein and adapted to receive a driver. While a Phillip-type driver recess is illustrated, other types of driver recesses, such as slotted, Torx®, hexagonal, and the like, and combinations thereof (e.g. slot-Torx), can also be used. A generally cylindrical upper section extends coaxially downward from thehead 42. - Preferably, the screw, and ferrule are formed from a suitable metallic material such as aluminum.
- While the ferrule of the present invention is adapted to be press fit into the first structure, other means of mounting the captive screw on the structure can be employed, including conventional installation methods known as “flare-in,” “floating,” “p.c. board,” and “snap-in” installation methods.
- Various other modifications can be made in the details of the various embodiments of the apparatus of the present invention, all within the scope and spirit of the invention and defined by the appended claims.
Claims (20)
1. A captive screw comprising:
a ferrule having an inner annular ring on an interior surface of the ferrule;
a screw having a head, a shank adapted to pass through the ferrule, a threaded portion at the end of the shank opposite the head, and a collar formed on the shank proximate the threaded portion; and
a spring extending on the shank of the screw between the head and the ferrule;
wherein the screw is captivated on the ferrule between the head and the collar, and the inner ring is dimensioned such that the collar does not permit movement of the collar past the inner annular ring but permits the passing through of the threads of the screw through the collar.
2. The captive screw according to claim 1 wherein the ferrule has a generally cylindrical exterior surface having a plurality of knurls for securing the captive screw in a preformed aperture in a first structure.
3. The captive screw according to claim 1 wherein the inner annular ring forms a generally circular opening in the ferrule.
4. The captive screw according to claim 2 wherein the ferrule has an annular lip formed on the exterior cylindrical surface proximate the top of the ferrule for limiting the penetration of the ferrule in the preformed aperture in the first structure.
5. The captive screw according to claim 2 wherein the ferrule has an annular circumferential groove formed in the exterior cylindrical surface of the ferrule immediately adjacent and below the annular lip for receiving the plastic flow of material when the ferrule is pressed into the preformed aperture.
6. A captive screw comprising:
a ferrule having a first and a second opposed ends and an inner annular ring on an interior surface of the ferrule, said ferrule having an annular lip at one of said first and second opposed ends and an annular circumferential exterior groove adjacent said annular a screw having a head, a shank adapted to pass through the ferrule, a threaded portion at one end of the shank opposite the head, and a collar formed on the shank proximate the threaded portion; and
a spring extending on the shank of the screw between the head and the ferrule;
wherein the screw is captivated on the ferrule between the head and the collar, and the inner annular ring is dimensioned such that the collar does not permit movement of the collar past the inner annular ring but permits the passing through of the threads of the screw through the collar.
7. The captive screw according to claim 6 wherein the annular lip and the circumferential exterior groove are dimensioned and configured for pressing the ferrule into a panel and securing the captive screw in a preformed aperture in a first structure.
8. The captive screw according to claim 6 wherein the end of the ferrule at which the annular lip is located faces the screw head.
9. The captive screw according to claim 6 wherein the end of the ferrule at which the annular lip is located faces the threaded portion of the screw.
10. The captive screw according to claim 6 wherein the inner annular ring forms a generally circular opening.
11. The captive screw according to claim 6 wherein the inner ring is formed by plastic flow of the ferrule during assembly of the captive screw.
12. A captive screw comprising:
a ferrule having a first and a second opposed ends, said ferrule having:
a first annular lip at one of said first and second opposed ends;
an annular circumferential exterior groove adjacent said first annular lip; and
a second annular lip adjacent to the annular circumferential exterior groove and located across the annular circumferential exterior groove with respect to the first annular lip;
a screw having a head, a shank adapted to pass through the ferrule, a threaded portion at one end of the shank opposite the head, and a collar formed on the shank proximate the threaded portion; and
a spring extending on the shank of the screw between the head and the ferrule;
wherein the screw is captivated on the ferrule between the head and the collar, and the ferrule is dimensioned such that the collar does not permit movement of the collar past the ferrule but permits the passing through of the threads of the screw through the collar.
13. The captive screw according to claim 12 wherein the ferrule has a generally circular interior surface.
14. The captive screw according to claim 12 wherein the annular lip and the circumferential exterior groove are dimensioned and configured for pressing the ferrule into a panel and securing the captive screw in a preformed aperture in a first structure.
15. The captive screw according to claim 12 wherein the first annular lip extends outwardly away from the ferrule farther than the second annular lip.
16. The captive screw of claim 12 in combination with a heat sink.
17. A captive screw comprising:
a screw having a head, a shank adapted to pass through the ferrule, a threaded portion at one end of the shank opposite the head, and a collar having a plurality of outwardly extending legs formed on the shank proximate the threaded portion; and
a spring extending on the shank of the screw between the head and the legs of the collar;
wherein said collar is dimensioned and configured so as not to permit the passing of the spring past the collar thereby captivating the screw.
18. The captive screw of claim 17 wherein the outwardly extending legs are substantially flexible thereby permitting the legs to fit through an aperture in a structure which has a cross section larger than a cross section of the collar defined by the ends of the legs when the legs of the collar are in an unflexed state.
19. The captive screw of claim 17 wherein the collar is in the shape of a crown.
20. The captive screw of claim 16 in combination with a heat sink.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/364,828 US20030175091A1 (en) | 2000-03-10 | 2003-02-10 | Floating captive screw |
TW093102901A TW200500557A (en) | 2003-02-10 | 2004-02-09 | Floating captive screw |
DE200410006381 DE102004006381A1 (en) | 2003-02-10 | 2004-02-09 | Captive screw for electronic devices, has screw captivated on ferrule and collar that does not permit movement of inner annular ring past collar but permits ring passing through of threads of screw through collar |
KR1020040008617A KR20040072478A (en) | 2003-02-10 | 2004-02-10 | Floating captive screw |
CNB2004100283562A CN100497969C (en) | 2003-02-10 | 2004-02-10 | Floating captive screw |
US11/856,577 US8794889B2 (en) | 2000-03-10 | 2007-09-17 | Floating captive screw |
US14/330,462 US20140321942A1 (en) | 2000-03-10 | 2014-07-14 | Floating captive screw |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18840600P | 2000-03-10 | 2000-03-10 | |
US09/803,221 US20010024607A1 (en) | 2000-03-10 | 2001-03-09 | Floating captive screw |
US10/364,828 US20030175091A1 (en) | 2000-03-10 | 2003-02-10 | Floating captive screw |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/803,221 Continuation-In-Part US20010024607A1 (en) | 2000-03-10 | 2001-03-09 | Floating captive screw |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/856,577 Continuation US8794889B2 (en) | 2000-03-10 | 2007-09-17 | Floating captive screw |
Publications (1)
Publication Number | Publication Date |
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US20030175091A1 true US20030175091A1 (en) | 2003-09-18 |
Family
ID=33096652
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
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US10/364,828 Abandoned US20030175091A1 (en) | 2000-03-10 | 2003-02-10 | Floating captive screw |
US11/856,577 Expired - Fee Related US8794889B2 (en) | 2000-03-10 | 2007-09-17 | Floating captive screw |
US14/330,462 Abandoned US20140321942A1 (en) | 2000-03-10 | 2014-07-14 | Floating captive screw |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
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US11/856,577 Expired - Fee Related US8794889B2 (en) | 2000-03-10 | 2007-09-17 | Floating captive screw |
US14/330,462 Abandoned US20140321942A1 (en) | 2000-03-10 | 2014-07-14 | Floating captive screw |
Country Status (5)
Country | Link |
---|---|
US (3) | US20030175091A1 (en) |
KR (1) | KR20040072478A (en) |
CN (1) | CN100497969C (en) |
DE (1) | DE102004006381A1 (en) |
TW (1) | TW200500557A (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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US10041518B1 (en) | 2017-01-09 | 2018-08-07 | Heartland Precision Fasteners, Inc. | Captive screw |
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US10687435B2 (en) | 2017-08-28 | 2020-06-16 | Facebook, Inc. | Apparatus, system, and method for enabling multiple storage-system configurations |
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US20230111661A1 (en) * | 2021-10-12 | 2023-04-13 | Hewlett Packard Enterprise Development Lp | Compact screw-latching assembly with overdrive protection |
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Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3204680A (en) * | 1963-02-04 | 1965-09-07 | South Chester Corp | Stand-off for retractable screw fastener |
US3465803A (en) * | 1967-07-26 | 1969-09-09 | Penn Eng & Mfg Corp | Captive screw device and a method for securing together the parts thereof |
US3502130A (en) * | 1968-03-04 | 1970-03-24 | Deutsch Fastener Corp | Captive jacking screw |
US3843080A (en) * | 1971-02-25 | 1974-10-22 | Itt | Mounting device for depending structural members from deck plate or the like |
US4557653A (en) * | 1981-10-13 | 1985-12-10 | Micro Plastics, Inc. | Captive panel screw |
US4915557A (en) * | 1988-09-13 | 1990-04-10 | Rexnord Holdings Inc. | Captive screw assembly |
US5059075A (en) * | 1989-03-31 | 1991-10-22 | Cooper Industries, Inc. | Retracting screw assembly |
US5558480A (en) * | 1994-01-20 | 1996-09-24 | Aoyama Seisakusho Co., Ltd. | Bolt for truss, wherein the bolt has shaft portions separated by a groove and a stopper having protrusions engaged in the groove |
US5743692A (en) * | 1997-02-18 | 1998-04-28 | Schwarz; Hans U. | Captive bolt assembly |
US6679666B2 (en) * | 2000-12-07 | 2004-01-20 | Aoyama Seisakusho Co., Ltd. | Screw having a temporary holding member on the screw shank |
Family Cites Families (55)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US748078A (en) * | 1903-08-03 | 1903-12-29 | Stromberg Carlson Telephone | Fastening device. |
US2201793A (en) * | 1939-06-05 | 1940-05-21 | Charles Richenburg | Window sash fastener |
US2967557A (en) * | 1956-11-23 | 1961-01-10 | Reeves Instrument Corp | Captive screw with sleeve to prevent engagement of the screw head with the work |
US3059736A (en) * | 1960-03-30 | 1962-10-23 | Illinois Tool Works | Spring loaded retractable captured screw assembly |
US3180389A (en) * | 1962-03-02 | 1965-04-27 | Frank Charles | Fastener-captive front panel |
US3250559A (en) * | 1963-10-14 | 1966-05-10 | Northrop Corp | Captive screw |
US3209806A (en) * | 1963-11-12 | 1965-10-05 | Automatic Elect Lab | Floatingly mounted captive thumbscrew fastener |
US3346032A (en) * | 1966-01-18 | 1967-10-10 | Deutsch Fastener Corp | Floating captive screw |
FR1541778A (en) * | 1966-10-31 | 1968-10-11 | Deutsch Fastener Corp | Captive screw and its manufacturing process |
US3426819A (en) * | 1967-02-20 | 1969-02-11 | Federal Screw Works | Bolt with deformable washer |
US3437119A (en) * | 1967-07-26 | 1969-04-08 | Standard Pressed Steel Co | Captive bolt unit |
US3614799A (en) * | 1969-07-14 | 1971-10-26 | Deutsch Fastener Corp | Method of producing a shear resistant captive screw |
US4212224A (en) * | 1978-09-25 | 1980-07-15 | American Optical Corporation | Jacking screw type fastener |
US4387497A (en) * | 1980-11-07 | 1983-06-14 | Bulent Gulistan | Captive screw assembly method and product |
US4720223A (en) * | 1985-05-07 | 1988-01-19 | Rexnord Inc. | Controlled preload, self-retracting captive fastener assembly |
US5130210A (en) * | 1989-08-25 | 1992-07-14 | Tonen Corporation | Stabilized zirconia solid electrolyte and process for preparation thereof |
DE4390783C1 (en) | 1992-02-28 | 1999-11-25 | Aavid Eng Inc | Device for connecting a heat sink to an electronic circuit |
DE4310002C1 (en) * | 1993-03-27 | 1994-04-21 | Kellermann Fa Rudolf | Noise discharge connecting component - has body with projection having recess in which seal sits and has friction surfaces between body and screw |
US5336028A (en) * | 1993-04-13 | 1994-08-09 | Vsi Corporation | Captive screw assembly |
DE29521903U1 (en) * | 1994-02-01 | 1998-11-12 | Bergner Richard Gmbh Co | Assembly unit consisting of an assembly part, a fixing part and a sleeve as a protection against loss |
US5475564A (en) | 1994-12-20 | 1995-12-12 | Chiou; Ming D. | CPU heat sink holding-down device |
FR2729045B1 (en) * | 1994-12-29 | 1997-01-24 | Bull Sa | METHOD AND DEVICE FOR FIXING TWO ELEMENTS SUCH AS AN INTEGRATED CIRCUIT RADIATOR IN A PRINTED CIRCUIT BOARD |
US5638258A (en) | 1995-10-24 | 1997-06-10 | Lin; Jen-Cheng | CPU heat sink fastener |
US5743531A (en) * | 1995-11-24 | 1998-04-28 | Rosa; Elsie | Mathematical investment game |
US5662163A (en) | 1995-11-29 | 1997-09-02 | Silicon Graphics, Inc. | Readily removable heat sink assembly |
US5782595A (en) * | 1995-12-23 | 1998-07-21 | Richard Bergner Gmbh & Co. | Assembly unit comprised of an assembly element and a fastening element |
US5757621A (en) * | 1996-06-06 | 1998-05-26 | Lucent Technologies Inc. | Heat sink assembly employing spring-loaded standoffs |
US5738531A (en) | 1996-09-09 | 1998-04-14 | International Business Machines Corporation | Self-alligning low profile socket for connecting ball grid array devices through a dendritic interposer |
US5875699A (en) * | 1997-01-16 | 1999-03-02 | Dynamic Dies, Inc. | Cutting die mounting system |
US5730210A (en) | 1997-02-24 | 1998-03-24 | Silicon Integrated Systems Corporation | Heat sink having an assembling device |
US5903434A (en) | 1997-06-10 | 1999-05-11 | Chiou; Ming Chin | CPU heat sink clamping device |
US5828553A (en) | 1997-06-10 | 1998-10-27 | Chiou; Ming Chin | CPU heat sink fastener |
US5755276A (en) | 1997-06-10 | 1998-05-26 | Chiou; Ming Chin | CPU heat sink fastener |
US5999402A (en) | 1997-10-28 | 1999-12-07 | Dell Usa, L.P. | Heat sink fastener retention apparatus and method for computer systems |
US5881800A (en) | 1998-04-03 | 1999-03-16 | Chung; Kuang-Hua | Heat sink fastener |
US5910052A (en) * | 1998-04-14 | 1999-06-08 | Southco, Inc. | Process for manufacturing a captive screw |
US6025994A (en) | 1998-06-29 | 2000-02-15 | Chiou; Ming Horng | Heat sink fastener |
DE29815492U1 (en) | 1998-08-28 | 1998-10-29 | Kuo Jung Feng | Improved screw element |
US6246584B1 (en) | 1999-04-16 | 2001-06-12 | Hon Hai Precision Ind. Co., Ltd. | Heat sink |
US6101096A (en) | 1999-06-10 | 2000-08-08 | Intel Corporation | Heat sink clip for an electronic assembly |
TW500244U (en) | 1999-06-11 | 2002-08-21 | Foxconn Prec Components Co Ltd | Buckle device for heat dissipater |
TW443715U (en) | 1999-06-17 | 2001-06-23 | Foxconn Prec Components Co Ltd | Fastener of heat dissipation device |
US6182958B1 (en) | 1999-07-12 | 2001-02-06 | Lucent Technologies Inc. | Fixture for securing a component to a heat sink |
US6157539A (en) * | 1999-08-13 | 2000-12-05 | Agilent Technologies | Cooling apparatus for electronic devices |
US6055159A (en) | 1999-08-20 | 2000-04-25 | Compal Electronics, Inc. | Heat dissipating module for a heat generating electronic component |
US6282761B1 (en) | 2000-01-27 | 2001-09-04 | The United States Of America As Represented By The Secretary Of The Navy | Heat sink pressure clip |
TW465907U (en) | 2000-03-15 | 2001-11-21 | Foxconn Prec Components Co Ltd | Heat sink fastening device |
TW468821U (en) | 2000-03-31 | 2001-12-11 | Foxconn Prec Components Co Ltd | Cooler device combination |
TW534367U (en) | 2000-04-05 | 2003-05-21 | Foxconn Prec Components Co Ltd | Heat dissipation device assembly |
TW585387U (en) | 2000-04-20 | 2004-04-21 | Foxconn Prec Components Co Ltd | Heat sink locking device |
TW531146U (en) | 2000-07-01 | 2003-05-01 | Foxconn Prec Components Co Ltd | Heat sink fastening device |
GB2385646B (en) * | 2000-12-16 | 2004-04-14 | Southco | Captive screw |
US6449157B1 (en) * | 2001-10-03 | 2002-09-10 | Ho Kang Chu | IC package assembly with retention mechanism |
US6786691B2 (en) * | 2002-05-07 | 2004-09-07 | Tyco Electronics Corporation | Load cell for securing electronic components |
US7641431B2 (en) * | 2007-08-15 | 2010-01-05 | Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. | Fastening device for heat sink |
-
2003
- 2003-02-10 US US10/364,828 patent/US20030175091A1/en not_active Abandoned
-
2004
- 2004-02-09 DE DE200410006381 patent/DE102004006381A1/en not_active Withdrawn
- 2004-02-09 TW TW093102901A patent/TW200500557A/en unknown
- 2004-02-10 CN CNB2004100283562A patent/CN100497969C/en not_active Expired - Lifetime
- 2004-02-10 KR KR1020040008617A patent/KR20040072478A/en not_active Application Discontinuation
-
2007
- 2007-09-17 US US11/856,577 patent/US8794889B2/en not_active Expired - Fee Related
-
2014
- 2014-07-14 US US14/330,462 patent/US20140321942A1/en not_active Abandoned
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3204680A (en) * | 1963-02-04 | 1965-09-07 | South Chester Corp | Stand-off for retractable screw fastener |
US3465803A (en) * | 1967-07-26 | 1969-09-09 | Penn Eng & Mfg Corp | Captive screw device and a method for securing together the parts thereof |
US3502130A (en) * | 1968-03-04 | 1970-03-24 | Deutsch Fastener Corp | Captive jacking screw |
US3843080A (en) * | 1971-02-25 | 1974-10-22 | Itt | Mounting device for depending structural members from deck plate or the like |
US4557653A (en) * | 1981-10-13 | 1985-12-10 | Micro Plastics, Inc. | Captive panel screw |
US4915557A (en) * | 1988-09-13 | 1990-04-10 | Rexnord Holdings Inc. | Captive screw assembly |
US5059075A (en) * | 1989-03-31 | 1991-10-22 | Cooper Industries, Inc. | Retracting screw assembly |
US5558480A (en) * | 1994-01-20 | 1996-09-24 | Aoyama Seisakusho Co., Ltd. | Bolt for truss, wherein the bolt has shaft portions separated by a groove and a stopper having protrusions engaged in the groove |
US5743692A (en) * | 1997-02-18 | 1998-04-28 | Schwarz; Hans U. | Captive bolt assembly |
US6679666B2 (en) * | 2000-12-07 | 2004-01-20 | Aoyama Seisakusho Co., Ltd. | Screw having a temporary holding member on the screw shank |
Cited By (43)
Publication number | Priority date | Publication date | Assignee | Title |
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US6871431B2 (en) * | 2002-03-28 | 2005-03-29 | Tyson Schmidt | License plate having captive thumb screw fastener |
US20030182828A1 (en) * | 2002-03-28 | 2003-10-02 | Tyson Schmidt | License plate having captive thumb screw fastener |
US7179037B2 (en) * | 2002-12-18 | 2007-02-20 | Southco, Inc. | Telescopic captive fastener |
US20040165966A1 (en) * | 2002-12-18 | 2004-08-26 | Aukzemas Thomas V. | Telescopic captive fastener |
US20050163588A1 (en) * | 2004-01-22 | 2005-07-28 | Gass Richard C. | Pop-up fastener |
US7114899B2 (en) * | 2004-01-22 | 2006-10-03 | Richard Christopher Gass | Pop-up fastener |
US20060093456A1 (en) * | 2004-11-04 | 2006-05-04 | Delcourt Mark H | Positive hold weld stud |
US20080087024A1 (en) * | 2006-10-13 | 2008-04-17 | Dell Products, Lp | Hybrid heat exchanger |
US8453467B2 (en) | 2006-10-13 | 2013-06-04 | Dell Products, Lp | Hybrid heat exchanger |
US9588554B2 (en) | 2006-10-13 | 2017-03-07 | Dell Products, Lp | Hybrid heat exchanger |
US20080127463A1 (en) * | 2006-11-30 | 2008-06-05 | Foxconn Technology Co., Ltd. | Fastener and heat dissipation device using the same |
US20090047097A1 (en) * | 2007-08-15 | 2009-02-19 | Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. | Fastening device for heat sink |
US7641431B2 (en) * | 2007-08-15 | 2010-01-05 | Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. | Fastening device for heat sink |
US7564683B2 (en) * | 2007-08-30 | 2009-07-21 | Dell Products, Lp | Cooling subsystem with easily adjustable mounting assembly |
US20090110511A1 (en) * | 2007-10-25 | 2009-04-30 | Chia-Chun Cheng | Elastic fastener |
US20090277617A1 (en) * | 2008-05-08 | 2009-11-12 | Dell Products, Lp | Liquid Cooling System with Automatic Pump Speed Control |
US7893635B2 (en) | 2008-05-08 | 2011-02-22 | Dell Products, Lp | Liquid cooling system with automatic pump speed control |
US20110100595A1 (en) * | 2009-10-30 | 2011-05-05 | Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. | Fastener and heat dissipation device using the same |
US8511956B2 (en) * | 2009-10-30 | 2013-08-20 | Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. | Fastener and heat dissipation device using the same |
US20110228451A1 (en) * | 2010-03-16 | 2011-09-22 | Foxconn Technology Co., Ltd. | Fastener and fixing device and electronic device using the same |
US8292562B2 (en) * | 2010-03-16 | 2012-10-23 | Foxconn Technology Co., Ltd. | Fastener and fixing device and electronic device using the same |
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US20120009041A1 (en) * | 2010-07-09 | 2012-01-12 | Vega Grieshaber Kg | Mounting device for fastening a module onto a component, in particular an outside housing of another module |
US8784025B2 (en) * | 2010-07-09 | 2014-07-22 | Vega Grieshaber Kg | Mounting device for fastening a module onto a component, in particular an outside housing of another module |
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US20120189400A1 (en) * | 2011-01-20 | 2012-07-26 | Ming-Chung Chiu | Floating fastener |
US8585336B2 (en) * | 2011-08-18 | 2013-11-19 | Furui Precise Component (Kunshan) Co., Ltd. | Fastener |
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US20130045062A1 (en) * | 2011-08-18 | 2013-02-21 | Foxconn Technology Co., Ltd. | Fastener |
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US20140000855A1 (en) * | 2012-06-27 | 2014-01-02 | Foxconn Technology Co., Ltd. | Heat dissipation device with fastener |
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US20210229244A1 (en) * | 2020-01-24 | 2021-07-29 | The Wooster Brush Company | Tool holder and packaging therefor |
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Also Published As
Publication number | Publication date |
---|---|
TW200500557A (en) | 2005-01-01 |
US20140321942A1 (en) | 2014-10-30 |
CN1550682A (en) | 2004-12-01 |
DE102004006381A1 (en) | 2004-10-28 |
CN100497969C (en) | 2009-06-10 |
KR20040072478A (en) | 2004-08-18 |
US8794889B2 (en) | 2014-08-05 |
US20080056844A1 (en) | 2008-03-06 |
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