EP1655105A1 - Depth stop assembly - Google Patents

Depth stop assembly Download PDF

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Publication number
EP1655105A1
EP1655105A1 EP05109884A EP05109884A EP1655105A1 EP 1655105 A1 EP1655105 A1 EP 1655105A1 EP 05109884 A EP05109884 A EP 05109884A EP 05109884 A EP05109884 A EP 05109884A EP 1655105 A1 EP1655105 A1 EP 1655105A1
Authority
EP
European Patent Office
Prior art keywords
depth stop
connecting sleeve
adjusting ring
stop arrangement
arrangement according
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.)
Granted
Application number
EP05109884A
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German (de)
French (fr)
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EP1655105B1 (en
Inventor
Thomas Bader
Matthias Keith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
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Hilti AG
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Publication date
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Publication of EP1655105A1 publication Critical patent/EP1655105A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/003—Stops for limiting depth in rotary hand tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/0064—Means for adjusting screwing depth
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/55—Cutting by use of rotating axially moving tool with work-engaging structure other than Tool or tool-support
    • Y10T408/566—Axially fixed to Tool

Definitions

  • the invention relates to a depth stop arrangement for presetting a desired insertion depth for a fastener to be set for a motor-driven screwdriver, which has a tool holder on a tool-side nosepiece of a device housing.
  • the depth stop arrangement has an adjusting ring, which can be attached to the nosepiece of the screwdriving device in a rotatable manner via a connecting sleeve, wherein the connecting sleeve can be formed separately or as part of the device housing.
  • the depth stop arrangement on a substantially sleeve-shaped depth stop, which is displaceable by turning the adjusting ring in an axial direction relative to the connecting sleeve.
  • an axial securing is provided, via which the adjusting ring on the connecting sleeve and thus also the depth stop on the device housing in the axial direction can be fixed.
  • a rotation lock is provided on the depth stop arrangement, via which the adjusting ring for maintaining a preset position of the depth stop relative to the device housing until reaching an adjusting torque applied by an operator in the direction of rotation on the connecting sleeve can be fixed.
  • Such depth stop arrangements are used in a known manner to set a maximum insertion depth for a clearlynavendes with the screwdriver in a workpiece fastener, such as in particular a screw in advance.
  • the torque transmission from the engine to the tool holder is usually interrupted by separation of a slip when reaching the set depth.
  • the depth stop arrangement is removable from the screwdriver, for example, to use this without depth stop or to exchange a screwdriver bit.
  • a disadvantage of the known Tiefeneinstellsystem is that in particular the adjusting ring has a very complex construction as a result of the resilient elements formed on it. In addition, it is mainly between the elevations of the nose piece and the indentations of the spring elements to increased wear, leading to a relatively short life of the anti-rotation.
  • the present invention has for its object to avoid at a depth stop arrangement, the disadvantages mentioned and both a stable axial securing the detachable attachment of the depth stop on the screwdriver and a rotation lock for sufficient assurance of a set position of the depth stop relative to the device housing of the screwdriver with easier To assemble and low cost manufacturing.
  • the object is achieved in that the axial securing has a relation to the adjusting ring and the connecting sleeve separately shaped, at least partially elastic locking element. This can be brought into an axially acting engagement both with the adjusting ring and with the connecting sleeve.
  • the elastic means required for the axial securing can be formed separately from the adjusting ring as well as from the connecting sleeve.
  • the construction of both the adjusting ring and the connecting sleeve can be greatly simplified, which in turn reduces the manufacturing cost. Due to the elastic design of the locking element at the same time a simple installation of the depth stop arrangement is possible.
  • the blocking element can be brought into engagement with at least one receiving recess of the adjusting ring, at least in the axial direction.
  • the blocking element has at least one elastic latching means which can be latched with a counter-latching means of the connecting sleeve.
  • the blocking element is substantially U-shaped and the counter-locking means formed by a circumferential receiving groove.
  • the two free legs of the U-shaped locking element act as spring arms that snap when mounting in the recess. In this way, a particularly simple assembly is achieved.
  • the blocking element is formed from wire, whereby on the one hand the wear is minimized and on the other hand, the locking element is particularly inexpensive to produce.
  • the connecting sleeve on the tool side of the receiving groove forms a cone section, which tapers away from the receiving groove.
  • the blocking element is automatically spread apart when attaching the adjusting ring on the connecting sleeve through the conically shaped portion to subsequently snap into the receiving groove. In this way, the assembly is further simplified.
  • the anti-rotation device has a contact profile formed on the connecting sleeve, against which the blocking element can be supported against rotation until it reaches the setting torque on the contact profile.
  • the blocking element is both part of the axial securing and part of the anti-rotation device. In this way, the items required for the depth stop arrangement can be kept low, which simplifies the assembly and further reduces the manufacturing cost. In addition, this can reduce the space required for the depth stop arrangement and the wear on the rotation lock.
  • both the axial securing and the rotation lock between the adjusting ring and the connecting sleeve are formed solely by the locking element held on the adjusting ring and the receiving groove of the connecting sleeve.
  • both fuses can be implemented in a simple manner and with minimal space and with few components.
  • the groove bottom on a six-sided cross section on the one hand in each rotational position, a sufficiently large support of the adjusting ring on the blocking element on the connection sleeve and on the other hand ensures a sufficiently accurate adjustability of the Eincardiefe.
  • Fig. 1 shows a screwdriver 2 in the form of a drywall screwdriver.
  • This has a device housing 4, which forms an opening 8 on a nose piece 6.
  • a nose piece 6 Through the nose piece 6 extends an axially displaceable tool spindle 10, which is rotatably driven by a motor 14 about a shaft A about a gear 12 and a conventional, biased in release position slip clutch 13 from an engine around.
  • the tool spindle 10 is rotatably coupled to a tool holder 16, in which a bit 18 is inserted for screwing a screw, not shown.
  • connection sleeve 22 with a plurality of spring arms 24, at whose free ends in each case a latching element 26 is formed.
  • this is pushed onto the nose piece 6, wherein the formed on the spring arms 24 locking elements 26 first pivot to the side and then snap into a circumferential locking groove 28 which is embedded in the nose piece 6.
  • the connection sleeve 22 may also be connected via a screw connection to the device housing 4 or be formed integrally therewith.
  • the depth stop arrangement 20 has an adjusting ring 30, which in the manner described below is held rotatably on the connecting sleeve 22 about the axis A. is and has an internal thread 32 which cooperates with an external thread 34 of a screwed into the adjusting ring 30, sleeve-shaped depth stop 36 together.
  • axial securing As can be seen from Figs. 2 and 3, for axial securing of the adjusting ring 30 on the connecting sleeve 22, a total of 38 designated axial securing is provided which has a U-shaped locking element 40 which is made of spring wire. Consequently, the locking element 40 forms two spring legs 41, which act as locking means of the axial securing.
  • the axial securing 38 on the adjusting ring 30 at least two receiving recesses 42 in the form of breakthroughs, can be used in the parts of the locking element 40 to set this on the adjusting ring 30 in both the axial and in a rotational direction D by positive engagement.
  • the axial securing device 38 has a counter-locking means in the form of a recessed receiving groove 43 which is let into the connecting sleeve 22.
  • the connecting sleeve 22 has a longitudinal bore 44 for partially receiving the depth stop 36.
  • Longitudinal ribs 46 project into this longitudinal bore 44.
  • longitudinal grooves 48 are arranged on the depth stop 36, as can be seen from FIG.
  • the depth stop 36 is first introduced into the adjusting ring 30 and the external thread 34 of the depth stop 36 with the internal thread 32 of the adjusting ring 30 is screwed.
  • the blocking element 40 is inserted into the receiving recesses 42 of the adjusting ring 30.
  • the adjusting ring 30 is pushed onto the connecting sleeve 22, wherein the longitudinal ribs 46 of the connecting sleeve 22 are received in the longitudinal grooves 48 of the depth stop 36 to prevent rotation of the depth stop 36 relative to the connecting sleeve.
  • the spring legs 41 of the retaining element 30 retained in the locking element 40 are spread apart by a tapered section 50 away from the receiving groove 43 in the direction of the tool-side end of the connecting sleeve, in order subsequently to snap into the receiving groove 43.
  • the axial securing 38 is closed and the adjusting ring 30 thus fixed axially to the connecting sleeve 22.
  • the receiving groove 43 has a groove bottom 52, which forms a hexagonal profile with six abutment sides 54.
  • the two spring legs 41 are pressed by their remindverformungs within one of the Anleeodor 54.
  • the spring element 40 supports the adjusting ring 30 via the two spring legs 41 in the direction of rotation D on the groove bottom 52.
  • the blocking element 40 thus forms together with the receiving recesses 42 and the Anleelois 54 of the groove bottom 52 a total of 55 designated rotation lock.
  • This rotation lock 55 prevents unintentional rotation of the adjusting ring 30 up to a certain actuating torque to be applied to the adjusting ring 30 by an operator, from which an adjustment of the screwing-in depth prescribed by the position of the depth stop 36 would result.
  • the spring leg 41 Upon reaching the setting torque by the operator, however, the spring leg 41 are spread by the hexagonal profile of the groove bottom 52 so that they can skip from one of the Anleelois 54 to the subsequent landing page 54.
  • the adjusting ring 30 is rotated relative to the depth stop 36, which is non-rotatably held on the connecting sleeve 22 as a result of the interaction of the longitudinal ribs 46 with the longitudinal grooves 48.
  • the interlocking threads 32, 34 while the depth stop 36 is axially displaced relative to the connecting sleeve 22 and the device housing 4 and thus the predetermined insertion depth at which the slip clutch 13 is separated adjusted.
  • a directional mark 58 is provided to indicate in which direction of rotation D of the adjusting ring 30, the Eindusiefe is reduced or increased.

Abstract

The arrangement has an adjusting ring (30) fixable to a connection sleeve (22) by an axial lock (38). A twist lock (55) fixes the ring to the sleeve until achievement of adjusting torques introduced by a user in a rotating direction. The axial lock has a stopping unit (40) which is separately drawn-out opposite to the ring and sleeve. The unit is brought in contact with the ring and sleeve in an axial direction, and made of filament.

Description

Die Erfindung betrifft eine Tiefenanschlag-Anordnung zum Voreinstellen einer gewünschten Eindrehtiefe für ein zu setzendes Befestigungsmittel für ein motorisch betriebenes Schraubgerät, das an einem werkzeugseitigen Nasenstück eines Gerätegehäuses eine Werkzeugaufnahme aufweist. Die Tiefenanschlag-Anordnung weist einen Stellring auf, der über eine Anschlusshülse verdrehbar an dem Nasenstück des Schraubgerätes anbringbar ist, wobei die Anschlusshülse separat oder als Teil des Gerätegehäuses ausgeformt sein kann. Zudem weist die Tiefenanschlag-Anordnung einen im Wesentlichen hülsenförmigen Tiefenanschlag auf, der durch Verdrehen des Stellringes in einer axialen Richtung gegenüber der Anschlusshülse verschiebbar ist. Ferner ist eine Axialsicherung vorgesehen, über die der Stellring an der Anschlusshülse und somit auch der Tiefenanschlag an dem Gerätegehäuse in axialer Richtung festlegbar ist. Ferner ist an der Tiefenanschlag-Anordnung eine Drehsicherung vorgesehen, über die der Stellring zur Beibehaltung einer voreingestellten Position des Tiefenanschlages gegenüber dem Gerätegehäuse bis zum Erreichen eines durch einen Bediener aufgebrachten Stelldrehmomentes in Drehrichtung an der Anschlusshülse festlegbar ist.The invention relates to a depth stop arrangement for presetting a desired insertion depth for a fastener to be set for a motor-driven screwdriver, which has a tool holder on a tool-side nosepiece of a device housing. The depth stop arrangement has an adjusting ring, which can be attached to the nosepiece of the screwdriving device in a rotatable manner via a connecting sleeve, wherein the connecting sleeve can be formed separately or as part of the device housing. In addition, the depth stop arrangement on a substantially sleeve-shaped depth stop, which is displaceable by turning the adjusting ring in an axial direction relative to the connecting sleeve. Further, an axial securing is provided, via which the adjusting ring on the connecting sleeve and thus also the depth stop on the device housing in the axial direction can be fixed. Furthermore, a rotation lock is provided on the depth stop arrangement, via which the adjusting ring for maintaining a preset position of the depth stop relative to the device housing until reaching an adjusting torque applied by an operator in the direction of rotation on the connecting sleeve can be fixed.

Derartige Tiefenanschlag-Anordnungen dienen in bekannter Weise dazu, eine maximale Eindrehtiefe für ein mit dem Schraubgerät in ein Werkstück einzudrehendes Befestigungselement, wie insbesondere eine Schraube, vorab festzulegen. Dabei wird bei Erreichen der eingestellten Eindrehtiefe die Drehmomentübertragung vom Motor zur Werkzeugaufnahme üblicherweise durch Trennung einer Rutschkupplung unterbrochen. Die Tiefenanschlag-Anordnung ist dabei vom Schraubgerät abnehmbar, beispielsweise um dieses auch ohne Tiefenanschlag benutzen zu können oder um ein Schrauberbit auszutauschen.Such depth stop arrangements are used in a known manner to set a maximum insertion depth for a einzudrehendes with the screwdriver in a workpiece fastener, such as in particular a screw in advance. In this case, the torque transmission from the engine to the tool holder is usually interrupted by separation of a slip when reaching the set depth. The depth stop arrangement is removable from the screwdriver, for example, to use this without depth stop or to exchange a screwdriver bit.

Aus der US 5,830,132 ist ein Tiefeneinstellsystem für kraftbetriebene Schraubgeräte bekannt, bei dem der Stellring an seinem vom Werkzeug abgewandten Ende zwei federnde Hakenelemente aufweist. Bei der Montage schnappen diese hinter eine an einer Gehäuseöffnung umlaufend ausgeformte Rippe. Ferner sind an dem Stellring ringförmig angeordnete Federelemente vorgesehen, die mehrere Einbuchtungen ausbilden. Diese Einbuchtungen verrasten in mehreren Drehpositionen des Stellringes gegenüber dem Gehäuse mit entsprechend angeordneten Erhebungen, die an einem am Gehäuse festgeschraubten Nasenstück ausgeformt sind.From US 5,830,132 a Tiefeneinstellsystem for power-driven screwing is known in which the adjusting ring has at its end facing away from the tool end two resilient hook elements. During assembly, they snap behind a rib formed on a housing opening. Furthermore, annularly arranged on the adjusting ring Provided spring elements that form a plurality of indentations. These indentations engage in several rotational positions of the adjusting ring relative to the housing with correspondingly arranged elevations, which are formed on a nut-piece screwed to the housing.

Bei dieser bekannten Konstruktionsweise des Tiefeneinstellsystems werden die Axialsicherung und die Drehsicherung im Wesentlichen durch die verschiedenen federnden Elemente des Stellringes gebildet, die jeweils mit entsprechend ausgebildeten Formteilen zusammenwirken.In this known construction of the Tiefeneinstellsystems the axial securing and rotational security are essentially formed by the different resilient elements of the adjusting ring, which cooperate with correspondingly shaped parts.

Nachteilig an dem bekannten Tiefeneinstellsystem ist, dass insbesondere der Stellring infolge der an ihm ausgebildeten federnden Elemente eine sehr aufwändige Konstruktion aufweist. Zudem kommt es vor allem zwischen den Erhebungen des Nasenstückes und den Einbuchtungen der Federelemente zu erhöhten Verschleisserscheinungen, die zu einer relativ geringen Lebensdauer der Drehsicherung führen.A disadvantage of the known Tiefeneinstellsystem is that in particular the adjusting ring has a very complex construction as a result of the resilient elements formed on it. In addition, it is mainly between the elevations of the nose piece and the indentations of the spring elements to increased wear, leading to a relatively short life of the anti-rotation.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, bei einer Tiefenanschlag-Anordnung die genannten Nachteile zu vermeiden und sowohl eine stabile Axialsicherung zur lösbaren Anbringung des Tiefenanschlages an dem Schraubgerät als auch eine Drehsicherung zur ausreichenden Sicherung einer eingestellten Position des Tiefenanschlages gegenüber dem Gerätegehäuse des Schraubgerätes bei leichter Montierbarkeit und geringen Herstellungskosten zu gewährleisten.The present invention has for its object to avoid at a depth stop arrangement, the disadvantages mentioned and both a stable axial securing the detachable attachment of the depth stop on the screwdriver and a rotation lock for sufficient assurance of a set position of the depth stop relative to the device housing of the screwdriver with easier To assemble and low cost manufacturing.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass die Axialsicherung ein gegenüber dem Stellring und der Anschlusshülse separat ausgeformtes, zumindest teilweise elastisches Sperrelement aufweist. Dieses ist sowohl mit dem Stellring als auch mit der Anschlusshülse in einen axial wirkenden Eingriff bringbar. Hierdurch können die für die Axialsicherung benötigten elastischen Mittel separat vom Stellring als auch von der Anschlusshülse ausgeformt werden. Somit kann die Konstruktion sowohl des Stellringes als auch der Anschlusshülse stark vereinfacht werden, wodurch wiederum die Herstellungskosten verringert werden. Durch die elastische Ausbildung des Sperrelementes wird dabei gleichzeitig eine einfache Montage der Tiefenanschlag-Anordnung ermöglicht.According to the invention the object is achieved in that the axial securing has a relation to the adjusting ring and the connecting sleeve separately shaped, at least partially elastic locking element. This can be brought into an axially acting engagement both with the adjusting ring and with the connecting sleeve. As a result, the elastic means required for the axial securing can be formed separately from the adjusting ring as well as from the connecting sleeve. Thus, the construction of both the adjusting ring and the connecting sleeve can be greatly simplified, which in turn reduces the manufacturing cost. Due to the elastic design of the locking element at the same time a simple installation of the depth stop arrangement is possible.

In einer besonders bevorzugten Ausführungsform ist das Sperrelement mit wenigstens einer Aufnahmeausnehmung des Stellringes zumindest in axialer Richtung in Eingriff bringbar. Zudem weist das Sperrelement mindestens ein elastisches Rastmittel auf, das mit einem Gegenrastmittel der Anschlusshülse verrastbar ist. Hierdurch kann bei vereinfachter Montage eine stabile Festlegung des Stellringes an der Anschlusshülse und damit gleichzeitig eine stabile axiale Festlegung des Tiefenanschlages an dem Gerätegehäuse gewährleistet werden.In a particularly preferred embodiment, the blocking element can be brought into engagement with at least one receiving recess of the adjusting ring, at least in the axial direction. In addition, the blocking element has at least one elastic latching means which can be latched with a counter-latching means of the connecting sleeve. This can be simplified assembly a stable fixing of the adjusting ring on the connecting sleeve and thus at the same time a stable axial fixing of the depth stop are ensured on the device housing.

Vorteilhafterweise ist das Sperrelement im Wesentlichen U-förmig und das Gegenrastmittel durch eine umlaufende Aufnahmenut gebildet. Hierbei wirken die beiden freien Schenkel des U-förmigen Sperrelementes als Federarme, die beim Montieren in die Rastausnehmung schnappen. Auf diese Weise wird eine besonders einfache Montage erzielt.Advantageously, the blocking element is substantially U-shaped and the counter-locking means formed by a circumferential receiving groove. Here, the two free legs of the U-shaped locking element act as spring arms that snap when mounting in the recess. In this way, a particularly simple assembly is achieved.

Bevorzugterweise ist das Sperrelement aus Draht gebildet, wodurch einerseits der Verschleiss minimiert wird und andererseits das Sperrelement besonders kostengünstig herstellbar ist.Preferably, the blocking element is formed from wire, whereby on the one hand the wear is minimized and on the other hand, the locking element is particularly inexpensive to produce.

Vorteilhafterweise bildet die Anschlusshülse werkzeugseitig der Aufnahmenut einen Konusabschnitt aus, der sich von der Aufnahmenut weg verjüngt. Hierdurch wird das Sperrelement beim Aufstecken des Stellringes auf die Anschlusshülse durch den konisch geformten Abschnitt selbsttätig aufgespreizt, um anschliessend in die Aufnahmenut zu schnappen. Auf diese Weise wird die Montage weiter vereinfacht.Advantageously, the connecting sleeve on the tool side of the receiving groove forms a cone section, which tapers away from the receiving groove. As a result, the blocking element is automatically spread apart when attaching the adjusting ring on the connecting sleeve through the conically shaped portion to subsequently snap into the receiving groove. In this way, the assembly is further simplified.

Ferner ist es besonders günstig, wenn die Drehsicherung ein an der Anschlusshülse ausgeformtes Anlegeprofil aufweist, an dem das Sperrelement bis zum Erreichen des Stelldrehmomentes an dem Anlegeprofil drehfest abstützbar ist. Hierdurch ist das Sperrelement sowohl Teil der Axialsicherung als auch Teil der Drehsicherung. Auf diese Weise können die für die Tiefenanschlag-Anordnung benötigten Einzelteile gering gehalten werden, was die Montage vereinfacht und die Herstellungskosten weiter senkt. Zudem können hierdurch der benötigte Bauraum der Tiefenanschlag-Anordnung sowie der Verschleiss an der Drehsicherung verringert werden.Furthermore, it is particularly advantageous if the anti-rotation device has a contact profile formed on the connecting sleeve, against which the blocking element can be supported against rotation until it reaches the setting torque on the contact profile. As a result, the blocking element is both part of the axial securing and part of the anti-rotation device. In this way, the items required for the depth stop arrangement can be kept low, which simplifies the assembly and further reduces the manufacturing cost. In addition, this can reduce the space required for the depth stop arrangement and the wear on the rotation lock.

Dabei ist es vorteilhaft, wenn das Anlegeprofil durch einen Nutboden der umlaufenden Aufnahmenut gebildet ist. Hierdurch werden sowohl die Axialsicherung als auch die Drehsicherung zwischen dem Stellring und der Anschlusshülse allein durch das am Stellring gehaltene Sperrelement und die Aufnahmenut der Anschlusshülse gebildet. Somit können beide Sicherungen auf einfache Weise und bei minimiertem Bauraum und mit wenigen Bauteilen umgesetzt werden.It is advantageous if the application profile is formed by a groove bottom of the circumferential receiving groove. As a result, both the axial securing and the rotation lock between the adjusting ring and the connecting sleeve are formed solely by the locking element held on the adjusting ring and the receiving groove of the connecting sleeve. Thus, both fuses can be implemented in a simple manner and with minimal space and with few components.

Vorteilhafterweise weist der Nutboden einen sechsseitigen Querschnitt auf, der einerseits in jeder Drehstellung eine ausreichend grosse Abstützung des Stellringes über das Sperrelement an der Anschlusshülse und andererseits eine ausreichend genaue Einstellbarkeit der Eindrehtiefe gewährleistet.Advantageously, the groove bottom on a six-sided cross section, on the one hand in each rotational position, a sufficiently large support of the adjusting ring on the blocking element on the connection sleeve and on the other hand ensures a sufficiently accurate adjustability of the Eindrehiefe.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispieles näher erläutert. Es zeigen:

Fig. 1
eine teilweise geschnittene Ansicht eines Schraubgerätes mit einer erfindungsgemässen Tiefenanschlag-Anordnung,
Fig. 2
eine perspektivische Ansicht der Tiefenanschlag-Anordnung in explodierter Darstellung und
Fig. 3
einen Querschnitt in der Ebene III-III der Fig. 2 im Bereich einer kombinierten Axial- und Drehsicherung bei verbundenem Zustand einer Anschlusshülse und einem Stell-ring.
The invention will be explained in more detail below with reference to an embodiment. Show it:
Fig. 1
a partially sectioned view of a screwdriver with a novel depth stop arrangement,
Fig. 2
a perspective view of the depth stop assembly exploded and
Fig. 3
a cross-section in the plane III-III of Fig. 2 in the region of a combined axial and rotational locking in the connected state of a connection sleeve and a control ring.

Fig. 1 zeigt ein Schraubgerät 2 in Form eines Trockenbauschraubers. Dieses weist ein Gerätegehäuse 4 auf, das an einem Nasenstück 6 eine Öffnung 8 ausbildet. Durch das Nasenstück 6 hindurch ragt eine axial verschiebbare Werkzeugspindel 10, die über ein Getriebe 12 und eine übliche, in Trennstellung vorgespannte Rutschkupplung 13 von einem Motor 14 um eine Achse A herum rotatorisch antreibbar ist. Die Werkzeugspindel 10 ist mit einer Werkzeugaufnahme 16 drehfest gekoppelt, in die ein Bit 18 zum Eindrehen einer nicht dargestellten Schraube eingesteckt ist.Fig. 1 shows a screwdriver 2 in the form of a drywall screwdriver. This has a device housing 4, which forms an opening 8 on a nose piece 6. Through the nose piece 6 extends an axially displaceable tool spindle 10, which is rotatably driven by a motor 14 about a shaft A about a gear 12 and a conventional, biased in release position slip clutch 13 from an engine around. The tool spindle 10 is rotatably coupled to a tool holder 16, in which a bit 18 is inserted for screwing a screw, not shown.

Um eine maximale Eindrehtiefe der Schraube voreinstellen zu können, ist an dem Nasenstück 6 eine insgesamt mit 20 bezeichnete Tiefenanschlag-Anordnung angebracht. Diese weist eine Anschlusshülse 22 mit mehreren Federarmen 24 auf, an deren freien Enden jeweils ein Rastelement 26 ausgeformt ist. Um die Anschlusshülse 22 an dem Gerätegehäuse 4 zu befestigen, wird diese auf das Nasenstück 6 aufgeschoben, wobei die an den Federarmen 24 ausgeformten Rastelemente 26 zunächst zur Seite schwenken und dann in eine umlaufende Rastnut 28 schnappen, die in das Nasenstück 6 eingelassen ist. Alternativ zu einer solchen oder ähnlichen Rastverbindung kann die Anschlusshülse 22 auch über eine Schraubverbindung mit dem Gerätegehäuse 4 verbunden werden oder mit diesem einteilig ausgeformt sein.In order to preset a maximum insertion depth of the screw, a total of 20 designated depth stop arrangement is attached to the nose piece 6. This has a connection sleeve 22 with a plurality of spring arms 24, at whose free ends in each case a latching element 26 is formed. In order to secure the connecting sleeve 22 to the device housing 4, this is pushed onto the nose piece 6, wherein the formed on the spring arms 24 locking elements 26 first pivot to the side and then snap into a circumferential locking groove 28 which is embedded in the nose piece 6. As an alternative to such a locking connection or similar, the connection sleeve 22 may also be connected via a screw connection to the device housing 4 or be formed integrally therewith.

Ferner weist die Tiefenanschlag-Anordnung 20 einen Stellring 30 auf, der in nachfolgend beschriebener Weise an der Anschlusshülse 22 um die Achse A herum verdrehbar gehalten ist und der ein Innengewinde 32 aufweist, das mit einem Aussengewinde 34 eines in den Stellring 30 eingeschraubten, hülsenförmigen Tiefenanschlages 36 zusammen wirkt.Furthermore, the depth stop arrangement 20 has an adjusting ring 30, which in the manner described below is held rotatably on the connecting sleeve 22 about the axis A. is and has an internal thread 32 which cooperates with an external thread 34 of a screwed into the adjusting ring 30, sleeve-shaped depth stop 36 together.

Wie aus den Fig. 2 und 3 zu entnehmen ist, ist zur axialen Sicherung des Stellringes 30 an der Anschlusshülse 22 eine insgesamt mit 38 bezeichnete Axialsicherung vorgesehen, die ein U-förmiges Sperrelement 40 aufweist, das aus Federdraht hergestellt ist. Folglich bildet das Sperrelement 40 zwei Federschenkel 41 aus, die als Rastmittel der Axialsicherung fungieren. Zudem weist die Axialsicherung 38 an dem Stellring 30 wenigstens zwei Aufnahmeausnehmungen 42 in Form von Durchbrüchen auf, in die Teile des Sperrelementes 40 eingesetzt werden können, um dieses an dem Stellring 30 sowohl in axialer als auch in einer Drehrichtung D durch Formschluss festzulegen. Ferner weist die Axialsicherung 38 ein Gegenrastmittel in Form einer an der Anschlusshülse 22 eingelassenen, umlaufenden Aufnahmenut 43 auf.As can be seen from Figs. 2 and 3, for axial securing of the adjusting ring 30 on the connecting sleeve 22, a total of 38 designated axial securing is provided which has a U-shaped locking element 40 which is made of spring wire. Consequently, the locking element 40 forms two spring legs 41, which act as locking means of the axial securing. In addition, the axial securing 38 on the adjusting ring 30 at least two receiving recesses 42 in the form of breakthroughs, can be used in the parts of the locking element 40 to set this on the adjusting ring 30 in both the axial and in a rotational direction D by positive engagement. Furthermore, the axial securing device 38 has a counter-locking means in the form of a recessed receiving groove 43 which is let into the connecting sleeve 22.

Wie aus den Fig. 2 und 3 weiter zu entnehmen ist, weist die Anschlusshülse 22 eine Längsbohrung 44 zur teilweisen Aufnahme des Tiefenanschlages 36 auf. In diese Längsbohrung 44 ragen Längsrippen 46. Entsprechend diesen Längsrippen 46 sind an dem Tiefenanschlag 36 Längsnuten 48 angeordnet, wie aus Fig. 2 zu entnehmen ist.As can also be seen from FIGS. 2 and 3, the connecting sleeve 22 has a longitudinal bore 44 for partially receiving the depth stop 36. Longitudinal ribs 46 project into this longitudinal bore 44. Corresponding to these longitudinal ribs 46, longitudinal grooves 48 are arranged on the depth stop 36, as can be seen from FIG.

Bei der Anbringung der Tiefenanschlag-Anordnung 20 an dem Schraubgerät 2 wird zunächst der Tiefenanschlag 36 in den Stellring 30 eingeführt und das Aussengewinde 34 des Tiefenanschlages 36 mit dem Innengewinde 32 des Stellringes 30 verschraubt. Zudem wird das Sperrelement 40 in die Aufnahmeausnehmungen 42 des Stellringes 30 eingesetzt. Anschliessend wird der Stellring 30 auf die Anschlusshülse 22 aufgeschoben, wobei die Längsrippen 46 der Anschlusshülse 22 in den Längsnuten 48 des Tiefenanschlages 36 aufgenommen werden, um ein Verdrehen des Tiefenanschlages 36 gegenüber der Anschlusshülse zu verhindern. Gleichzeitig werden die Federschenkel 41 des im Stellring 30 gehaltenen Sperrelementes 40 durch einen sich von der Aufnahmenut 43 weg in Richtung des werkzeugseitigen Endes der Anschlusshülse 22 verjüngenden Konusabschnitt 50 aufgespreizt, um anschliessend in die Aufnahmenut 43 zu schnappen. Auf diese Weise wird die Axialsicherung 38 geschlossen und der Stellring 30 somit an der Anschlusshülse 22 axial festgelegt.When attaching the depth stop assembly 20 to the screwdriver 2, the depth stop 36 is first introduced into the adjusting ring 30 and the external thread 34 of the depth stop 36 with the internal thread 32 of the adjusting ring 30 is screwed. In addition, the blocking element 40 is inserted into the receiving recesses 42 of the adjusting ring 30. Subsequently, the adjusting ring 30 is pushed onto the connecting sleeve 22, wherein the longitudinal ribs 46 of the connecting sleeve 22 are received in the longitudinal grooves 48 of the depth stop 36 to prevent rotation of the depth stop 36 relative to the connecting sleeve. At the same time, the spring legs 41 of the retaining element 30 retained in the locking element 40 are spread apart by a tapered section 50 away from the receiving groove 43 in the direction of the tool-side end of the connecting sleeve, in order subsequently to snap into the receiving groove 43. In this way, the axial securing 38 is closed and the adjusting ring 30 thus fixed axially to the connecting sleeve 22.

Wie aus den Fig. 2 und 3 weiter zu entnehmen ist, weist die Aufnahmenut 43 einen Nutboden 52 auf, der ein sechseckiges Profil mit sechs Anlegeseiten 54 ausformt. Im angebrachten Zustand werden die beiden Federschenkel 41 durch ihre Rückverformungskräfte gegen jeweils eine der Anlegeseiten 54 gepresst. Hierdurch stützt das Federelement 40 den Stellring 30 über die beiden Federschenkel 41 in Drehrichtung D an dem Nutboden 52 ab.As can also be seen from FIGS. 2 and 3, the receiving groove 43 has a groove bottom 52, which forms a hexagonal profile with six abutment sides 54. In the attached state, the two spring legs 41 are pressed by their Rückverformungskräfte against one of the Anleeseiten 54. As a result, the spring element 40 supports the adjusting ring 30 via the two spring legs 41 in the direction of rotation D on the groove bottom 52.

Das Sperrelement 40 bildet somit zusammen mit den Aufnahmeausnehmungen 42 und den Anlegeseiten 54 des Nutbodens 52 eine insgesamt mit 55 bezeichnete Drehsicherung. Diese Drehsicherung 55 verhindert bis zu einem bestimmten am Stellring 30 durch einen Bediener aufzubringendes Stellmoment ein ungewolltes Verdrehen des Stellringes 30, aus dem eine Verstellung der durch die Position des Tiefenanschlages 36 vorgegebenen Eindrehtiefe resultieren würde. Bei Erreichen des Stellmomentes durch den Bediener werden dagegen die Federschenkel 41 durch das sechseckige Profil des Nutbodens 52 derart aufgespreizt, dass sie von einer der Anlegeseiten 54 zur nachfolgenden Anlegeseite 54 überspringen können. Hierdurch wird der Stellring 30 gegenüber dem Tiefenanschlag 36 verdreht, der infolge des Zusammenwirkens der Längsrippen 46 mit den Längsnuten 48 drehfest an der Anschlusshülse 22 gehalten ist. Durch die ineinander greifenden Gewinde 32, 34 wird dabei der Tiefenanschlag 36 gegenüber der Anschlusshülse 22 und dem Gerätegehäuse 4 axial verschoben und somit die vorbestimmte Eindrehtiefe, bei der die Rutschkupplung 13 getrennt wird, verstellt.The blocking element 40 thus forms together with the receiving recesses 42 and the Anleeseiten 54 of the groove bottom 52 a total of 55 designated rotation lock. This rotation lock 55 prevents unintentional rotation of the adjusting ring 30 up to a certain actuating torque to be applied to the adjusting ring 30 by an operator, from which an adjustment of the screwing-in depth prescribed by the position of the depth stop 36 would result. Upon reaching the setting torque by the operator, however, the spring leg 41 are spread by the hexagonal profile of the groove bottom 52 so that they can skip from one of the Anleeseiten 54 to the subsequent landing page 54. As a result, the adjusting ring 30 is rotated relative to the depth stop 36, which is non-rotatably held on the connecting sleeve 22 as a result of the interaction of the longitudinal ribs 46 with the longitudinal grooves 48. By the interlocking threads 32, 34 while the depth stop 36 is axially displaced relative to the connecting sleeve 22 and the device housing 4 and thus the predetermined insertion depth at which the slip clutch 13 is separated adjusted.

An einer Aussenfläche 56 der Anschlusshülse 22 ist dabei eine Richtungsmarkierung 58 vorgesehen, um anzuzeigen, in welcher Drehrichtung D des Stellringes 30 die Eindrehtiefe verringert beziehungsweise vergrössert wird.On an outer surface 56 of the connecting sleeve 22 is a directional mark 58 is provided to indicate in which direction of rotation D of the adjusting ring 30, the Eindrehiefe is reduced or increased.

Claims (8)

Tiefenanschlag-Anordnung (20) für ein motorisch betriebenes Schraubgerät (2), das an einem werkzeugseitigen Nasenstück (6) eines Gerätegehäuses (4) eine Werkzeugaufnahme (16) aufweist,
mit einem Stellring (30), der über eine Anschlusshülse (22) verdrehbar an dem Nasenstück (6) anbringbar ist,
einem im Wesentlichen hülsenförmigen Tiefenanschlag (36), der durch Verdrehen des Stellringes (30) in einer axialen Richtung gegenüber der Anschlusshülse (22) verschiebbar ist,
einer Axialsicherung (38), über die der Stellring (30) in axialer Richtung an der Anschlusshülse (22) festlegbar ist und
einer Drehsicherung (55), über die der Stellring (30) bis zum Erreichen eines durch einen Bediener aufgebrachten Stelldrehmomentes in Drehrichtung (D) an der Anschlusshülse (22) festlegbar ist,
dadurch gekennzeichnet, dass die Axialsicherung (38) ein gegenüber dem Stellring (30) und der Anschlusshülse (22) separat ausgeformtes, zumindest teilweise elastisches Sperrelement (40) aufweist, das in axialer Richtung sowohl mit dem Stellring (30) als auch mit der Anschlusshülse (22) in Eingriff bringbar ist.Depth stop arrangement (20) for a motor-driven screwdriving device (2), which has a tool holder (16) on a tool-side nose piece (6) of a device housing (4),
with an adjusting ring (30) which can be attached to the nose piece (6) in a rotatable manner via a connecting sleeve (22),
a substantially sleeve-shaped depth stop (36), which is displaceable by turning the adjusting ring (30) in an axial direction relative to the connecting sleeve (22),
an axial securing device (38), by way of which the adjusting ring (30) can be fixed in the axial direction to the connecting sleeve (22) and
a rotation lock (55), by means of which the adjusting ring (30) can be fixed to the connecting sleeve (22) in the direction of rotation (D) until a setting torque applied by an operator is reached,
characterized in that the axial securing device (38) has a locking element (40), which is formed separately from the adjusting ring (30) and the connecting sleeve (22) and which is in the axial direction with both the adjusting ring (30) and the connecting sleeve (22) is engageable. Tiefenanschlag-Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass das Sperrelement (40) in wenigstens einer Aufnahmeausnehmung (42) des Stellringes (30) in axialer Richtung formschlüssig festlegbar ist und mindestens ein elastisches Rastmittel aufweist, das mit einem Gegenrastmittel der Anschlusshülse (22) verrastbar ist.Depth stop arrangement according to claim 1, characterized in that the blocking element (40) in at least one receiving recess (42) of the adjusting ring (30) is positively fixed in the axial direction and at least one resilient locking means, which with a counter-locking means of the connecting sleeve (22). is latched. Tiefenanschlag-Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Sperrelement (40) im Wesentlichen U-förmig und das Gegenrastmittel durch eine umlaufende Aufnahmenut (43) gebildet ist.Depth stop arrangement according to claim 1 or 2, characterized in that the blocking element (40) is substantially U-shaped and the counter-locking means by a circumferential receiving groove (43) is formed. Tiefenanschlag-Anordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Sperrelement (40) aus Draht gebildet ist.Depth stop arrangement according to one of claims 1 to 3, characterized in that the blocking element (40) is formed from wire. Tiefenanschlag-Anordnung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Anschlusshülse (22) werkzeugseitig der Aufnahmenut (43) einen Konusabschnitt (50) ausbildet, der sich von der Aufnahmenut (43) weg verjüngt.Depth stop arrangement according to claim 3 or 4, characterized in that the connection sleeve (22) on the tool side of the receiving groove (43) forms a cone portion (50) which tapers away from the receiving groove (43). Tiefenanschlag-Anordnung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Drehsicherung (55) ein an der Anschlusshülse (22) ausgeformtes Anlegeprofil aufweist, an dem das Sperrelement (40) bis zum Erreichen des Stelldrehmomentes drehfest abstützbar ist.Depth stop assembly of claims 1 to 5, characterized in that the rotation device (55) has a molded on the connecting sleeve (22) contact profile to which the lock member (40) rotationally fixed to reach the actuating torque is supported by one. Tiefenanschlag-Anordnung nach Anspruch 6, dadurch gekennzeichnet, dass das Anlegeprofil durch einen Nutboden (52) der umlaufenden Aufnahmenut (43) gebildet ist.Depth stop arrangement according to claim 6, characterized in that the contact profile by a groove bottom (52) of the circumferential receiving groove (43) is formed. Tiefenanschlag-Anordnung nach Anspruch 7, dadurch gekennzeichnet, dass der Nutboden (52) einen sechsseitigen Querschnitt aufweist.Depth stop arrangement according to claim 7, characterized in that the groove bottom (52) has a hexagonal cross-section.
EP05109884.6A 2004-11-04 2005-10-24 Depth stop assembly Active EP1655105B1 (en)

Applications Claiming Priority (1)

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DE102004053250A DE102004053250A1 (en) 2004-11-04 2004-11-04 Depth stop arrangement

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EP1655105A1 true EP1655105A1 (en) 2006-05-10
EP1655105B1 EP1655105B1 (en) 2013-07-03

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US (1) US7337697B2 (en)
EP (1) EP1655105B1 (en)
JP (1) JP4971624B2 (en)
CN (1) CN100551629C (en)
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ES (1) ES2422421T3 (en)

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CN1769008A (en) 2006-05-10
US20070163397A1 (en) 2007-07-19
JP4971624B2 (en) 2012-07-11
ES2422421T3 (en) 2013-09-11
EP1655105B1 (en) 2013-07-03
US7337697B2 (en) 2008-03-04
CN100551629C (en) 2009-10-21
DE102004053250A1 (en) 2006-05-11
JP2006130651A (en) 2006-05-25

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