EP1568444A2 - Drilling Adapter - Google Patents

Abstract

The drill adapter (28) has a clamping device for releasable attachment to the tool end of a screwdriver tool (4), with a sleeve (30) fitting over a cylindrical section (66) of the latter and a drill chuck (32) for reception of a drill bit, a torque transfer device coupling the drill chuck with the tool spindle (12) of the screwdriver tool and a setting element having an axial stop (46) acting against the tool spindle for operation of a drive coupling (10) for the tool spindle.

Description

The invention relates to a drilling adapter, for use on a screwdriver, as well a Bohradapter screwdriver assembly with a fixing device, for releasable attachment at a tool-side end of the screwdriver, which is a slip-on sleeve, for application to a substantially cylindrical attachment region of the screwdriver, and fastening means having a fixed position, for securing the Bohradapters at Aufsteckbereich, and a release position, for separating or attaching the Bohradapters of or on the slip-on, have, a chuck, for receiving a drilling tool, which is rotatably supported relative to the fixing device, and a torque transmission device for rotatably coupling the drill chuck with a tool spindle of the screwdriver.

Such drill adapters are used to extend the function of a pure screwdriver, so that it can also be used for drilling. This way it is possible, for example with the screwdriver with attached drill adapter a guide bore in a workpiece, as a wood wall or a sheet pre-drill. Then it will the drill adapter removed from the screwdriver and this now for screwing a screw used in the guide hole.

From US 5,564,717 a drilling adapter is known, the slip-on molded in such a way is that they are placed over a remaining on the screwdriver depth stop can. In this case, the fixing device has an outer sleeve which displaceably the slip-on sleeve holds and in which a screw is stored. To set the drilling adapter on the screwdriver, the adjusting screw of the outer sleeve is screwed against the depth stop, as soon as a screwdriver bit remaining on the screwdriver goes into one with the chuck connected screw head engages.

An advantage of the known Bohradapters is that both the depth stop as also the screwdriver bit while using the drill adapter on the screwdriver remain. This is a quick attachment and removal of the depth stop and a quick change between the screwing and drilling function possible.

A disadvantage of the prior art drilling adapter is that it only intended for screwdrivers and is suitable, in which the remaining on the screwdriver Screwdriver bit in an axially fixed position slightly above the depth stop or a protruding nose ring. Thus, the applicability of Bohradapters is relative highly limited.

In addition, the connection between the drill adapter and the screwdriver is not very stable, so that it can often lead to malfunction during operation. Furthermore, there is in the known torque transmission device the risk that when attaching the Bohradapters the screwdriver bit does not engage correctly in the screw head. This can cause it Damage comes.

In addition, when attaching the Bohradapters the outer sleeve with one hand in a position spent and held in this, in which the screwdriver bit with the Screw head is engaged. In this position must be with the other hand at the same time the adjusting screw are tightened relatively firmly. Thus, no hand is free, for example to hold the screwdriver. The attachment of the drilling adapter is thus relatively complicated.

The present invention is based on the object with a drilling adapter for screwdrivers avoid the disadvantages mentioned and a broader applicability and better To enable handling.

According to the invention the object is achieved in that on the drilling adapter an actuator is provided, with an axial stop, to rest against the tool spindle of the Schraubgerätes and for operating a driving clutch on the tool spindle, in a partially limited by the slip-on and open to one side receiving space protrudes, and with respect to the axial direction positively with at least one in the Aufsteckhülse mounted engagement body is connected, in the Festlegestellung, for Producing an axial positive connection between the slip-on sleeve and the slip-on area, partially protrudes beyond an inner surface of the slip-on.

In many screwdrivers, the tool spindle is only then connected to a drive, when a driven by the tool spindle fastener against a workpiece is pressed. Here, the tool spindle against a spring force against a housing axially displaced while the take-up clutch engaged. in the unloaded state is the driving clutch, however, due to the on the tool spindle acting spring force out of engagement. This separate in the unloaded state driving clutch is advantageous in screwing operations to ensure safe engagement of the screwdriver bit to ensure in the screw head. In a drilling process, however, is a direct Torque transmission desirable because the sliding tool spindle in many cases would lead to an inaccurate drilling of the workpiece and the drill at the latest when retracting the screwdriver stops in the borehole, causing jamming and may cause damage.

By the proposed actuator, it is now possible, the drilling adapter to screwdrivers to use, which have a normally separate driving clutch. It comes when inserting the Aufsteckbereiches in the receiving space of the axial stop of the steep element in contact with the tool spindle. This will now be attached further of the drilling adapter on the screwdriver is moved through the axial stop until the driving clutch engaged. Now the slip-on sleeve over the engagement body with the attachment area be brought into engagement of the screwdriver. Since the axial stop opposite the slip-on sleeve is axially fixed, the driving clutch is due to the positive connection between the slip-on and the screwdriver permanently and stably engaged held. In this way, when attached Bohradapter a direct drive of Tool spindle achieved. Thus, the drill adapter is also in connection with screwdrivers, which have a normally separate driving clutch, usable in a comfortable manner.

In a preferred embodiment, the actuating element is together with the torque transmission device formed in one piece on a pestle, whereby the required Baurum the Bohradapters and the manufacturing cost can be reduced.

Advantageously, the plunger has a threaded end which is in a mating thread of the drill chuck can be screwed, and a spigot with polygonal cross-section, for insertion in a bit holder of the screwdriver, on. As a result, the torque is very high transferred directly from the tool spindle to the chuck, resulting in a higher efficiency can be achieved when drilling. In addition, the chuck on the plunger at Need to be exchanged. Further, by the adapted to the bit holder insertion end a simple and quick attachment or removal of the Bohradapters possible.

Preferably, from the insertion end is a stop element in the axial direction, the has a stopper cross-section which is smaller than the polygonal cross-section and whose free end forms the axial stop. As a result, when attaching the Bohradapters ensures axial contact between the plunger and the tool spindle, in turn a sufficient displacement of the tool spindle and thus a secure engagement achieved the driving clutch.

Alternatively, the plunger between the threaded end and the insertion end one Cross-section jump on which forms the axial stop. Such a jump in the cross section can, for example, at an end face of the tool spindle when attaching the Bohradapters come into contact with this, which shortens the length of the plunger and thus for better handling of the Bohradapters provides.

Advantageously, the at least one engagement body is in a transverse opening of the slip-on sleeve mounted, whose length is smaller than a longitudinal extent of the engagement body in the direction the transverse opening is. This is a simple disengagement of the engagement body of the Contact surface of the slip-on addition and a stable positive connection with the attachment area of the screwdriver possible.

It is particularly advantageous if the fastening means have a control body, which is displaceable on an outside of the slip-on parallel to this and through a spring force is biased in the fixed position, in which it rests against the transverse opening. This will easily a permanent positive connection between the drilling adapter and the screwdriver secured.

It is advantageous if the adjusting body is formed by a ring element, which on the Push-on sleeve is pushed and with an oblique annular surface, which is attached to the engagement body can be applied, an inner cone limited, wherein between the ring member and the slip-on an axial spring, which is also pushed onto this, acts. By such a shaped Ring element can be made a particularly stable positive connection and a tilt-free Move the adjusting body can be achieved. In addition, this is a convenient Holding the Bohradapters possible with simultaneous operation of the fixing device what the attachment of the Bohradapters on the screwdriver much easier.

Advantageously, the engagement body is spherical, whereby jamming of the engagement body can be avoided when moving in the transverse opening.

The invention is further by a drilling adapter screwdriver assembly with one of Previously described embodiments of the Bohradapters solved, the Schraubgerät one formed on the tool spindle counter-stop, to create the Axialanschlages, and formed on Aufsteckbereich engagement, for partial Receiving the protruding from the inner surface engagement body, comprising, wherein the axial distance between the counter stop and a center of engagement in the unshifted state of the tool spindle is greater than the axial distance between the axial stop and a center of the engagement body.

In this respect, the counter-stop of the tool spindle in one direction of the Schraubgerätes before the engagement of the Aufsteckbereichs is, the axial stop comes in Attach the Bohradapters in this way with the counter-stop in contact before the engagement body is located at the height of the engagement receptacle. Thus, the tool spindle already shifted over a predetermined length when the engagement body with the Engagement receptacle is brought into positive engagement. This is a safe intervention the driving clutch can be produced.

It is advantageous if the axial distance between the counter-stop and the engagement receiving about 3 to 7mm larger than the axial distance between axial stop and the engagement body. The difference of the distances is equal to the shift length the tool spindle and ensures safe intervention in this size range usual driving clutches.

Advantageously, the engagement reception by an annular groove for fixing a depth stop formed, wherein the diameter of the engagement body to the cross section of Ring groove is adjusted. In this way, on the one hand, the manufacturing costs are reduced and on the other hand ensures a secure positive connection.

Preferably, the tool spindle forms a bit holder and the polygonal Cross-section of the insertion end of the plunger is in size and shape to a receiving cross-section adapted to the bit holder, whereby a particularly good torque transmission is achieved.

Fig. 1

eine teilweise längsgeschnittene Explosionsdarstellung einer erfindungsgemässen Bohradapter-Schraubgerät-Anordnung,

Fig. 2

einen Längsschnitt durch Befestigungsmittel der Bohradapter-Schraubgerät-Anordnung nach Fig. 1 während dem Anbringen des Bohradapters am Schraubgerät und

Fig. 3

einen Längsschnitt durch die Bohradapter-Schraubgerät-Anordnung nach Fig. 1 im angebrachten Zustand des Bohradapters am Schraubgerät.

The invention will be explained in more detail below with reference to an embodiment. Show it:

Fig. 1

a partially longitudinally sectioned exploded view of an inventive Bohradapter screwdriver assembly,

Fig. 2

a longitudinal section through fastening means of Bohradapter screwdriver assembly of FIG. 1 during attachment of the Bohradapters on Schraubgerät and

Fig. 3

a longitudinal section through the Bohradapter screwdriver assembly of FIG. 1 in the attached state of the Bohradapters on screwdriver.

Fig. 1 shows a Bohradapter screwdriver assembly 2 with a screwdriver 4 in the form a Metallbausteraubers, of which only relevant for the invention tool side End is shown, to which an unillustrated tool bit is attachable. The Screwdriver 4 has a dashed line engine 6, which has a drive pinion. 8 and a driving clutch 10 a tool spindle 12 drives.

The driving clutch 10 in this case has a first coupling part 14, which on the tool spindle 12 is rotatably mounted and meshes with the drive pinion 8. A second Coupling member 16 of the driving clutch 10 is rotatably connected to the tool spindle 12. The two coupling parts 14, 16 have claws 18 which by moving the second coupling part 16 relative to the first coupling part 14 in and out of engagement can be brought. For this purpose, the tool spindle 12 is displaceable in a housing 20 of the Bolt 4 stored. For separating the driving clutch in the normal, i. unloaded, Condition of the tool spindle 12 is between the coupling parts 14, 16 a Coil spring 22 is provided which presses apart the two coupling parts 14, 16.

On a side facing away from the driving coupling 10 end of the tool spindle 12 has this one bit receptacle 24 with hexagonal cross section. The bit receptacle 24 is in Axial direction bounded by a bottom 25. To establish a not shown Screwdriver bits protrudes a clamping ball 26 partially into the bit holder 24th

At the screwdriver 4, a total of 28 designated drilling adapter is attached, the essentially of a slip-on sleeve 30, a chuck 32 and one by a plunger 34 formed torque transmission device consists. The drill chuck 32 is included can be mounted on the plunger 34 via a screw connection and can therefore be exchanged at any time become. The plunger 34 itself is rotatable about a ball bearing 36 but in the direction an axis A of the drilling adapter 28 immovably mounted on the slip-on sleeve 30.

The slip-on sleeve 30 partially defines a receiving space 38, which has an opening 40. In this receiving space 38 into the ram 34 protrudes with a spigot 42, which has a cross section adapted to the receiving cross section of the bit holder 24 is. From this insertion end 42 projects a stop element 44 in the direction of the opening 40, whose free end forms an axial stop 46. The stop element 44 has while a stop cross section, which is smaller than the cross section of the insertion 42nd is, which is engageable with the bit holder 24 an engagement.

At the slip-on sleeve 30 are three transverse openings 48 at angular intervals of 120 ° formed in the radial direction of the receiving space 38 with an outer side 50 of the Connect slip-on sleeve 30. As shown in dashed lines for a transverse opening 48, these serve for receiving an engagement body 52 in the form of a sphere whose diameter is larger as the length of the transverse opening 48.

On the outer side 50, an actuating sleeve 54 is provided, which is on the slip-on 30 is pushed and is mounted relative to this displaceable in the axial direction. At an inner side 56 of this actuating sleeve 54, an annular actuating body 58 is formed, which rests against the outside 50. This has a fixed position in which he auf axial height of the transverse opening 48 is and can be brought into contact with the engagement body 52, and a release position in which it is axially spaced from the transverse opening 48.

In the release position, an annular release space 60 is at the axial height of the transverse opening 48 arranged in the radial direction through the outer side 50 of the slip sleeve 30 and the inside 56 of the actuating sleeve 54 is limited. At the release space 60th adjacent axial end of the actuating body 58 of this forms an oblique annular surface 62, which limits an inner cone.

Between the slip-on sleeve 30 and the actuating sleeve 54 is also an axial spring 64th clamped, the adjusting body 58 relative to the slip-on 30 in the Festlegestellung biases.

To attach the Bohradapters 28 to the screwdriver 4, the slip-on 30, the serves as part of a fixing device, in a mounting direction B on a slip-on 66, which is formed on a surface 67 of a device neck 68, pushed. For this purpose, the receiving space 38 of the slip-on sleeve 30 in size and shape to the attachment area Adjusted 66 of the screwdriver 4. In this case, on an inner surface 70 of the slip-on 30 Axialaufnahmen formed 72, when mounting the Bohradapters 28 for Receiving axial ribs 74 serve formed on the surface 67 of the device neck 68 are. Further, in the surface 67 an annular groove 76 is inserted, which normally for fixing a depth stop, not shown, is used. In determining the Bohradapters 28 this is used to partially receive the engagement body 52.

As can be seen from Fig. 1, the annular groove 76 in the unloaded state of the tool spindle 12 an axial distance a to the bottom 25 of the bit holder 24. This one is 3 up to 7 mm larger than an axial distance b between the axial stop 46 and the center the engagement body 52.

In Fig. 2 is one of the engagement body 52 in its transverse opening 48 and the actuating sleeve 54 with the adjusting body 58, which serves as a fastening means of the fixing device of the drilling adapter Serve 28, shown when pushing the slip-on sleeve 30 on the Aufsteckbereich 66. In this case, the actuating sleeve 54 against the axial spring 64 against the slip-on 30 moved in the mounting direction B. In this way, the release space 60 is on axial height of the transverse opening 48.

The engagement body 52 can thus, as shown, at the entrance of the device neck 68 in the Receiving space 38 are moved in the transverse opening 48 so that he does not have the Inner surface 70 out into the receiving space 38 but on the outside 50 in addition the release space 60 protrudes into it. The Aufsteckbereich 66 of the screwdriver 4 can thus unhindered be inserted into the receiving space 38.

As can also be seen from FIG. 2, the transverse openings 48 on the receiving space side End of a minimal constriction 78 to a falling out of the respective engagement body 52 to prevent.

Because of the greater distance a from the distance b comes when pushing the Aufsteckhülse 30 on the Aufsteckbereich 66 of the axial stop 46 on the counter-stop functioning ground 25 in abutment before the engagement body 52 at the axial height the annular groove 76 has arrived, as shown in Fig. 2. In this case, the axial stop 46 due to the smaller stop cross-section of the stop element 44 unhindered the clamping ball 26 are pushed past.

As an alternative to the stop element 44, the axial stop 46 can be dashed as shown in FIG represented and designated by 46 ', also be formed by a cross-sectional jump 80, which can be applied to an end face 82 of the tool spindle 12.

By a further displacement of the slip-on sleeve 30 with respect to the attachment region 66 in the fastening direction B, the tool spindle 12 is counteracted by the axial stop 46 the coil spring 22 is displaced until the engagement body 52 at the axial height of the Ring groove 76 is and thus can be engaged with this, as shown in Fig. 3. In this position of the tool spindle 12 is now the driving clutch 10 in engagement. Of the Plunger 34 thus acts as an actuator for the displacement of the tool spindle 12 and Actuation of the driving clutch 10.

When releasing the actuating sleeve 54 of the actuating body 58 in consequence of the spring force of Axial spring 64 pressed into the set position, in the outside of the transverse opening 48 abuts against the engagement body 52. Hereby, the engaging body 52 and above it, the slip-on sleeve 30, the ball bearing 36 and the plunger 34 and the axial stop 46 in positively held axial engagement with the device neck 68. At the same time it is doing also the tool spindle 12 in its displaced position and the driving clutch 10th kept in a coupled state.

In this fixed position of the drilling adapter 28 on the screwdriver 4, the tool spindle 12 thus directly by switching on the motor 6 without externally applied force are set in rotation and the screwdriver 4 are used for drilling.

To remove the drilling adapter 28 from the screwdriver 4, the actuating sleeve 54 moved back in the mounting direction B and at the same time the slip-on 30 in opposite Direction pulled from the device neck 68. In this case, the engagement body 52 slip out of engagement with the annular groove 76 through the transverse opening 48 until it partially into the Release chamber 60 protrude. They give the receiving space 38 free to the neck of the device 68th to be able to move out of it.

Claims (13)

Drill adapter (28), for use on a screwdriver (4), with
a fixing device, for releasable attachment to a tool-side end of the screwing device (4),
the one Aufsteckhülse (30), for application to a substantially cylindrical Aufsteckbereich (66) of the Schraubgerätes (4), and
Fastening means, which have a fixing position, for securing the drilling adapter (28) to the attachment region (66), and a release position for separating or attaching the drilling adapter (28) from or to the attachment region (66),
a chuck (32) for receiving a drilling tool, which is rotatably supported relative to the fixing device, and
a torque transmission device for rotatably coupling the drill chuck (32) with a tool spindle (12) of the screwdriver (4),
characterized in that an adjusting element is provided,
with an axial stop (46), for abutment with the tool spindle (12) and for actuating a drive coupling (10) via the tool spindle (12), into a receiving space (38) partially bounded by the slip-on sleeve (30) and open to one side sticks out, and
with respect to the axial direction is positively connected to at least one in the slip sleeve (30) mounted engagement body (52) in the Festlegestellung, for establishing an axial positive connection between the slip-on sleeve (30) and the Aufsteckbereich (66), via an inner surface ( 70) of the slip-on sleeve (30) partially protrudes. Bohradapter according to claim 1, characterized in that the adjusting element is formed integrally with the torque transmitting device in one piece on a plunger (34). A drilling adapter according to claim 2, characterized in that the plunger (34) has a threaded end which can be screwed into a mating thread of the drill chuck (32) and a plug-in end (42) with a polygonal cross section for insertion into a bit receptacle (24) of the screwdriver ( 4). Bohradapter according to claim 3, characterized in that from the insertion end (42) projects a stop element (44) in the axial direction, which has a stop cross-section which is smaller than the polygonal cross-section and whose free end forms the axial stop (46). Bohradapter according to claim 3, characterized in that the plunger (34) between the threaded end and the insertion end has a cross-sectional jump (80) which forms the axial stop (46 '). Bohradapter according to one of claims 1 to 5, characterized in that the at least one engagement body (52) in a transverse opening (48) of the Aufsteckhülse (30) is mounted, whose length is smaller than a longitudinal extension of the engagement body (52) in the direction of the transverse opening ( 48). Bohradapter according to claim 6, characterized in that the fastening means comprise a control body (58) on an outer side (50) of the slip sleeve (30) is parallel to this and is biased by a spring force in the Festlegestellung in which he on the Transverse opening (48) is applied. Bohradapter according to claim 7, characterized in that the adjusting body (58) is formed by a ring member which is pushed onto the slip-on sleeve (30) and with an oblique annular surface (62) which can be applied to the engagement body (52), an inner cone limited, between the ring member and the slip-on sleeve (30) also an axial spring (64) which is slid on this. Bohradapter according to one of claims 1 to 8, characterized in that the engagement body (52) is spherical. Bohradapter screwdriver assembly (2) with a drilling adapter (28) according to one of claims 1 to 9, characterized in that the screwing device (4) formed on the tool spindle (12) counter-stop for abutment of the axial stop (46) of the actuating element,
and an engagement receptacle formed on the attachment region (66) for partially receiving the engagement body (52) projecting from the inner surface (70),
wherein the axial distance (a) between the counter-stop and a center of engagement engagement in the unshifted state of the tool spindle (12) is greater than the axial distance (b) between the axial stop (46) and a center of the engagement body (52). Bohradapter screwdriver assembly according to claim 10, characterized in that the axial distance (a) between the counter-stop and the engagement seat by 3 to 7 mm greater than the axial distance (b) between the axial stop (46) and the engagement body (52). Bohradapter screwdriver assembly according to claim 10 or 11, characterized in that the engagement reception by an annular groove (76), for receiving a depth stop, is formed and the diameter of the engagement body is adapted to the cross section of the annular groove (76). Bohradapter screwdriver assembly according to one of claims 10 to 12, characterized in that the tool spindle (12) forms a bit holder (24) and the polygonal cross-section of the insertion end (42) of the plunger (34) in size and shape to a receiving cross section of Bit recording (24) is adjusted.

Images