DE202024107232U1 - bit holder - Google Patents

Abstract

bit holder, comprehensive
- a main body (11) comprising a center hole (20) arranged inside the main body (11); a polygonal hole (21) arranged inside the main body (11) and communicating with the center hole (20); a plurality of blocking edges (22) formed at the point where the polygonal hole (21)h and the center hole (20) intersect; a first hole (23) passing through the main body (11) toward two opposite corners of the polygonal hole (21); and a second hole (24) passing through the main body (11) in the radial direction of the center hole (20);
- a sliding sleeve (14) which is slidably fitted over the main body (11) and comprises a movement hole (42) which receives the locations of the main body (11) forming the first and second holes (23, 24), a groove (44) which is recessed on the wall of the movement hole (42), and a conical hole (45) through which the movement hole (42) and an opening of the sliding sleeve (14) are connected;
- a piston holder (30) which is inserted into the central hole (20) and can be moved back and forth therein and comprises a magnet (32) which is arranged on the piston holder (30);
- a ball (25) which is inserted into the first hole (23) in such a way that it comes into contact with the wall of the conical hole (45) and thereby protrudes from the polygonal hole (21); and
- a steel ball (26) which is inserted into the second hole (24) in such a way that it comes into contact with the wall of the movement hole (42) and thereby protrudes from the central hole (20) and blocks the piston holder (30), wherein the groove (44) is directed towards the second hole (24) and receives the steel ball (26), wherein the piston holder (30) is pushed over the steel ball (26) and is mounted so that it cannot slip out by blocking the blocking edges (22).

Description

technical field

The invention relates to a coupling for connecting two tools, in particular a bit holder.

State of the art

In the US 9,731,356 B2 discloses a tool connector comprising a tool receiving part arranged to be displaceable back and forth between a first fixing position and a second fixing position.

In the normal position, the tool holder is in the first fixing position and can be moved to the second fixing position.

The tool holder further comprises a magnetic mechanism and a locking mechanism, the magnetic mechanism comprising a pendulum device and a plug. The pendulum device is built into the tool holder so that it can move back and forth. The tool holder has an annular lip that serves as the end point of the pendulum device's travel. The plug is inserted into the pendulum device and thereby has a magnetic force that is exerted on a working tool, such as a screwdriver bit, so that the working tool is connected to the tool holder in the first or second fixing position.

The locking mechanism comprises two balls that move in opposite directions. In the first locking position, the two balls have no effect on the screwdriver bit at all. In the second locking position, the two balls are brought into a circumferential notch on the screwdriver bit, so that the screwdriver bit is locked.

In the US 7,424,841 B2 discloses a device for locking and releasing a screw bit, in which an effect similar to an annular lip is achieved by changing the locking mechanism and influencing the structure of the magnetic mechanism by changing the locking mechanism. The locking mechanism consists of a first ball and two second balls, the first ball being caused to engage in a third notch on the screwdriver bit in order to connect the screwdriver bit to the said device for locking and releasing a screw bit. The magnetic mechanism inserts a magnet into a movable part on which a second notch is recessed in the circumferential direction, which notch can be locked by means of the two second balls moving in opposite directions.

When unlocked, the first ball is released from the third notch and the second notch is therefore no longer locked by the second two balls. Under the action of the mechanism, the screwdriver bit moves away from the screwdriver bit locking and unlocking device and attracts the moving part so that the moving part moves in the same direction. The two balls come into contact with the outer surface of the moving part and resist the magnetic force with the resulting friction force, allowing the moving part to remain in the screwdriver bit locking and unlocking device.

task of the invention

The invention is based on the object of creating a bit holder in which locking and blocking are achieved with few components, so that the manufacturing costs for the bit holder are reduced.

Technical solution

This object is achieved according to the invention by a bit holder having the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

The invention provides a bit holder consisting of a main body, a sliding sleeve, a plunger holder, a ball and a steel ball. The main body includes a center hole disposed inside the main body; a polygonal hole disposed inside the main body and communicating with the center hole; a plurality of blocking edges formed at the location where the polygonal hole and the center hole intersect; a first hole passing through the main body toward two opposite corners of the polygonal hole; and a second hole passing through the main body in the radial direction of the center hole. The sliding sleeve is slidably fitted over the main body and includes a moving hole receiving the locations of the main body forming the first and second holes; a groove recessed on the wall of the moving hole; and a tapered hole through which the moving hole and an opening of the sliding sleeve are communicated. The piston holder is inserted into the center hole and can be moved back and forth therein and includes a magnet which is arranged on the piston holder. The ball is inserted into the first hole in such a way that it comes into contact with the wall of the conical hole and thereby protrudes from the polygonal hole. The steel ball is inserted into the second hole in such a way that it comes into contact with the wall of the movement hole and thereby protrudes from the central hole and blocks the piston holder, whereby the groove is aligned with the second hole and receives the steel ball, whereby the piston holder is pushed over the steel ball and is mounted so that it cannot slip out by blocking the blocking edges.

Preferably, the main body further comprises a shoulder formed on the outside of the main body. A ring is provided and arranged to fit snugly against the outside of the main body, the ring and the shoulder being arranged at a certain distance from each other. The sliding sleeve further comprises a rib formed raised on the inside of the sliding sleeve, the rib being arranged between the ring and the shoulder. A compression spring is placed over the outside of the main body and is supported on the ring, the compression spring in the normal position pressing the rib so that the rib is adjacent to the shoulder.

Preferably, a shaft is combined with one end of the central hole to prevent the piston holder from undesirably slipping out of the main body. The piston holder further comprises a pin which extends from one end of the piston holder and is thus located at the end which is different from the end with the magnet. An elastic element is placed over the pin and is supported on the shaft, wherein the elastic element presses the magnet of the piston holder such that the magnet in the normal position moves towards the polygonal hole of the main body.

Short description of the drawings

• 1 shows an exploded view of a preferred embodiment of a bit holder according to the invention.
• 2 shows a perspective view of the bit holder according to the invention in 1 in assembled state.
• 3 shows a sectional view of the internal structure of the bit holder according to the invention in 1 in assembled state.
• 4 shows a perspective view of a cut-open sliding sleeve to illustrate the relative position of the ball and the steel ball in the main body of the bit holder according to the invention.
• 5 shows a perspective view of the bit holder according to the invention to illustrate the coupling of the components inside the bit holder.
• 6 shows a sectional view illustrating the internal structure of the bit holder according to the invention ready for use.

Detailed Description of a Preferred Embodiment

In the following, objects, features and advantages of the present invention will be explained in more detail with reference to the detailed description of an embodiment and the accompanying drawings. However, the invention is not limited to the description of this embodiment and its representation in the accompanying drawings.

In 1 a preferred embodiment of a bit holder 10 according to the invention is shown. The bit holder 10 consists of a main body 11, a shaft 12, a ring 13, a sliding sleeve 14, a ball 25, a ball bearing 26, a piston holder 30, a magnet 32, an elastic element 34 and a compression spring 47.

Inside the main body 11 there is a center hole 20 (see 3 ) and a polygonal hole 21, these two holes 20, 21 being connected to one another. The main body 11 is a tube. In this exemplary embodiment, the polygonal hole 21 is a hexagonal hole, the distance between two opposite corners being greater than the diameter of the central hole 20. The polygonal hole 21 has six edges, the distance between two opposite sides being smaller than the diameter of the central hole 20. The respective side crosses the central hole 20 in such a way that a blocking edge 22 is formed, six blocking edges 22 being provided on the central hole 21.

In this embodiment, the shaft 12 is a hexagonal pin on which a circumferential notch 17 is recessed. As can be seen from 2 and 3 As can be seen, the six corners of the shaft 12 engage the walls of the central hole 20 so that the shaft 12 is assembled with the main body 11 in a slip-proof manner. The circumferential notch 17 ensures that the bit holder 10 can be connected to a tool (not shown), e.g. a manual, electric or pneumatic tool.

In a further embodiment, it is conceivable to use a round shaft 12 which is frictionally engaged in one end of the center hole 20 sits so that the shaft 12 is connected to the main body 11 in a slip-proof manner.

In a further embodiment, it is conceivable to connect the main body 11 to a handle (not shown), wherein the handle closes one end of the center hole 20. This structural design is within the permissible scope of the present invention.

As in 1 and 3 As shown, the piston holder 30 is inserted into the center hole 20 and is blocked by the shaft 12 (or the handle) so that the piston holder 30 does not undesirably slip out of the main body 11. The diameter of the piston holder 30 is smaller than the diameter of the center hole 20. On an imaginary center axis of the center hole 20, the piston holder 30 pushes the shaft 12 between the blocking edges 22 relative to the main body 11. A round recess 31 is recessed at one end of the piston holder and is provided for receiving the magnet 32. The piston holder 30 further has a pin 33 which extends from one end of the piston holder 30 and is directed towards the shaft 12 (or the handle). The magnet 32 is directed towards the opening of the polygonal hole 21, with the magnet 32 and the pin 33 each located at the two ends of the piston holder 30.

In this embodiment, the elastic element 34 is also a compression spring. The elastic element 34 is inserted into the central hole 20 in such a way that it is inserted over the pin 33. The elastic element 34 is supported on the shaft 12 (or the handle) and presses the piston holder 30 in the normal position so that the piston holder 30 moves in the direction of the opening of the polygonal hole 21.

As in 3 As shown, the main body 11 is designed such that the sleeve wall has two different thicknesses from the center hole 20 to the outside of the main body 11, with a shoulder 19 being present at the point where a thick sleeve wall and a thin sleeve wall of the main body 11 adjoin each other. The segment of the main body 11 which has the thin sleeve wall runs through the ring 13, through the sliding sleeve 14 and through the compression spring 47.

As in 1 As shown, the sliding sleeve 14 is a round sleeve. A ribbing (not shown) is provided on the outer peripheral surface of the round sleeve to increase friction, whereby the ribbing can be a knurling, for example. The ribbing ensures that the sliding sleeve 14 is secured against loosening.

As in 3 As shown, a rib 40 is raised on the inside of the sliding sleeve 14 to separate the movement hole 42 from a receiving chamber 43 inside the sliding sleeve 14. An inner peripheral surface 41 forms the inside of the rib 40, the diameter of the inner peripheral surface 41 being smaller than the diameter of the main body segment with the thick sleeve wall, but larger than the diameter of the main body segment with the thin sleeve wall. Thus, the main body segment with the thin sleeve wall passes through the rib 40 so that the main body 11 is movable relative to the sliding sleeve 14. The thin sleeve wall fits together with the wall of the rib 40 and the wall of the sliding sleeve 14 such that the receiving chamber 43 represents a semi-open annular space intended to accommodate the compression spring 47.

The ring 13 fits tightly against the thin sleeve wall when the main body 11 is kept immobile. The ring 13 blocks the opening of the annular space and is at a certain distance from the shoulder 19. Thus, the ring 13 becomes a foundation stone with which the compression spring 47 generates a force.

The compression spring 47 is supported on the ring 13 and exerts the force on the rib 40 to push the sliding sleeve 14 so that the sliding sleeve 14 moves in the axial direction of the main body 11 so that the rib 40 comes into contact with the shoulder 19. When the compression spring 47 is in the state in which force is released, the rib 40 moves away from the ring 13 and represents the end point of the displacement path of the sliding sleeve 14. Conversely, when the ring 40 approaches the ring 13, the compression spring 47 comes into the state in which force accumulates (see 6 ).

As in 4 As shown, a first hole 23 and a second hole 24 are provided on the segment of the main body 11 which segment has the thick sleeve wall, the first and second holes 23, 24 passing through the thick sleeve wall. The compression spring 47 presses the sliding sleeve 14 such that the movement hole 42 receives the thick sleeve wall.

As in 5 As shown, the first hole 23 extends in the direction of two opposite corners of the polygonal hole 21 through the thick sleeve wall of the main body 11 and serves to receive the ball 25.

The movement hole 42 of the sliding sleeve 14 receives the main body segment with the thick sleeve wall and thereby blocks the openings of the first and second holes 23, 24. The movement hole 42 is connected to the end of a conical The ball 25 is connected to the wall of the movement hole 42 and/or the wall of the conical hole 45, which end has a smaller diameter, while the end of the conical hole 45, which end has a larger diameter, is connected to an opening 46 of the sliding sleeve 14. Under the action of the compression spring 47, the ball 25 comes into contact with the wall of the movement hole 42 and/or the wall of the conical hole 45 and partially protrudes from the polygonal hole 21, whereby the ball 25 remains secure against slipping out.

As in 3 As shown, the second hole 24 passes through the thick sleeve wall of the main body 11 in the radial direction of the center hole 20 and serves to receive the steel ball 26. The steel ball 26 is in contact with the wall of the movement hole 42 and partially protrudes from the center hole 20 so that the piston holder 30 can be blocked by the steel ball 26.

As in 6 , a groove 44 is recessed on the wall of the movement hole 42 so that the exit of the groove 44 is directed towards the second hole 24, the groove 44 being intended to receive the steel ball 26 receded into the second hole 24. Here, the steel ball 26 protrudes no more than the central hole 20, so that the elastic member 34 presses the piston holder 30 so that the piston holder 30 exceeds the steel ball 26 and continuously advances towards the polygonal hole 21. The piston holder 30 is then blocked by the blocking edges 22 and does not detach from the main body 11. In other words, the steel ball 26 represents the starting point and the blocking edges 22 represent the end point of the course of the linear movement of the piston holder 30 relative to the main body 11.

With reference to 1 the principle of handling the bit holder 10 is explained. A screwdriver bit 15 has a drive end 16. In this embodiment, the drive end 16 has a Torx shape. In further embodiments, the drive end 16 can have a slotted, cross, hexagonal, square, Pozidriv shape or other geometric shapes. The screwdriver bit 15 also has six corners and edges (not shown) on which corner notches 18 are formed.

As in 4 and 6 As shown, the sliding sleeve 14, when loaded with force, shifts from the main body segment with the thick sleeve wall towards the main body segment with the thin sleeve wall. The rib 40 approaches the ring 13 and thereby compresses the compression spring 47. The rib 44 is located opposite the exit of the second hole 24 and partially receives the steel ball 26. The steel ball 26 retracts from the center hole 20 and unlocks the piston holder 30. The force released by the elastic element 34 is acted on the piston holder 30 such that the piston holder 30 passes over the steel ball 26 and reaches the center hole 21. Now the blocking edges 22 rest on the piston holder 30 such that the magnet 32 is located in the center hole 21.

Now the conical hole 45 is opposite the exit of the first hole 23, which allows the ball 25 to withdraw from the central hole 21. The screwdriver bit 15 is inserted into the polygonal hole 21 and, together with the piston holder 30, is pushed deep into the central hole 20 of the main body 11. The pin 22 is located close to the shaft 12, with the piston holder 30, together with the shaft 12, compressing the elastic element 34. At the same time, the magnet 32 firmly attracts the screwdriver bit 15.

As in 4 and 5 , the compression spring 47 releases force as soon as the sliding sleeve 14 is released. The rib 40 is then pushed with the released force, thus causing the sliding sleeve 14 to shift from the main body segment with the thin sleeve wall to the main body segment with the thick sleeve wall. The conical hole 45 exits the exit of the first hole 23. The wall of the movement hole 42 presses the ball 25 such that the ball 25 partially protrudes from the polygonal hole 21. The ball 25 then engages the corner notch 18, thereby preventing unwanted separation of the screwdriver bit 15 from the bit holder 10. At the same time, the groove 44 exits the second hole 24 and the wall surface of the movement hole 42 presses against the steel ball 26 such that the steel ball 26 partially protrudes from the center hole 20.

As in 3 As shown, the steel ball 26 blocks the piston holder 30, which does not affect the actuation of the screwdriver bit 15 by the bit holder 10.

As in 2 As shown, the bit holder 10 connects the screwdriver bit 15 to a tool. The drive end 15 protrudes from the bit holder 10 and is used to tighten or loosen a workpiece (not shown), such as a screw.

As in 6 As shown, the sliding sleeve 14 is loaded with a force such that it moves from the main body segment with the thick sleeve wall to the main body segment with the thin sleeve wall. The conical hole 45 is located opposite the exit of the first hole 23, which allows the ball 25 to withdraw from the central hole 21, so that the ball 25 moves away from the Corner notch 18 is released. The screwdriver bit 15 is pulled out of the bit holder 10 and can be exchanged for another screwdriver bit 15. Since the groove 44 is opposite the second hole 24 and the steel ball 26 recedes from the center hole 20, the elastic element 34 presses the piston holder 30 into the piston holder 30, the blocking edges 22 causing the piston holder 30 to separate from the screwdriver bit 15 and interrupt the attraction of the magnet 32.

As in 5 shown, the polygonal hole 21 accommodates another screwdriver bit 15. If the sliding sleeve 14 is released, the compression spring 47 presses the sliding sleeve 14 such that the sliding sleeve 14 returns to the starting position. The wall surface of the movement hole 42 presses the ball 25 such that the ball 25 protrudes from the polygonal hole 21 and snaps back into the corner notch 18 of the screwdriver bit 15. Since the groove 44 is not directed exactly at the second hole 24, the wall surface of the movement hole 42 prevents the steel ball 26 from receding. The steel ball 26 thus protrudes from the center hole 20 and blocks the piston holder 30, whereby the magnet 32 can attract the screwdriver bit 15 unhindered.

The bit holder 10 according to the invention has the following advantages. Firstly, the bit holder 10 is mechanically improved compared to conventional bit holders or tool couplings by replacing a first ball with the ball 25 and two second balls with the steel ball 26, whereby the bit holder 10 with few components achieves similar effects of locking and blocking with the conventional tool coupling in the US 7,424,841 B2 achieved, so that the manufacturing costs are reduced. Secondly, the blocking edges 22 block the piston holder 30 and thereby act like an annular lip in the prior art, and the steel ball 26 additionally blocks the piston holder 30 so that the magnet 32 approaches the entrance and exit of the polygonal hole 21, whereby the piston holder 30 thus attracts the screwdriver bit 15 and moves together with the screwdriver bit 15, which is compared to the conventional tool coupling from the US 9,731,356 B2 Thirdly, the ball 25 acts as strongly as two balls in the US 9,731,356 B2 as regards the locking of the screwdriver bit 15, so that the same effect is achieved with fewer components, which contributes to reducing manufacturing costs.

Although the present invention has been described in detail using an embodiment, it is obvious to those skilled in the art that the invention is not limited to this embodiment, but rather that modifications are possible in such a way that individual features can be omitted or other combinations of features can be implemented, as long as the scope of protection of the appended claims is not exceeded. The disclosure of the present invention includes all combinations of the individual features presented.

list of reference symbols

10

bit holder

11

main body

12

shaft

13

ring

14

sliding sleeve

15

screwdriver bit

16

drive end

17

circumferential notch

18

corner notch

19

shoulder

20

center hole

21

polygonal hole

22

blocking edge

23

first hole

24

second hole

25

Bullet

26

steel ball

30

piston holder

31

round recess

32

magnet

33

cones

34

elastic element

40

rib

41

inner circumferential surface

42

movement hole

43

recording chamber

44

groove

45

conical hole

46

opening

47

compression spring

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• US 9,731,356 B2 [0002, 0039]
• US 7,424,841 B2 [0006, 0039]

Claims (6)

Bit holder comprising - a main body (11) comprising a central hole (20) arranged inside the main body (11); a polygonal hole (21) arranged inside the main body (11) and communicating with the central hole (20); a plurality of blocking edges (22) formed at the point where the polygonal hole (21)h and the central hole (20) intersect; a first hole (23) passing through the main body (11) in the direction of two opposite corners of the polygonal hole (21); and a second hole (24) passing through the main body (11) in the radial direction of the central hole (20); - a sliding sleeve (14) which is slidably fitted over the main body (11) and comprises a movement hole (42) which receives the locations of the main body (11) forming the first and second holes (23, 24), a groove (44) which is recessed in the wall of the movement hole (42), and a conical hole (45) through which the movement hole (42) and an opening of the sliding sleeve (14) are connected; - a piston holder (30) which is inserted into the central hole (20) and can be moved back and forth therein and comprises a magnet (32) which is arranged on the piston holder (30); - a ball (25) which is inserted into the first hole (23) in such a way that it comes into contact with the wall of the conical hole (45) and thereby protrudes from the polygonal hole (21); and - a steel ball (26) which is inserted into the second hole (24) in such a way that it comes into contact with the wall of the movement hole (42) and thereby protrudes from the central hole (20) and blocks the piston holder (30), wherein the groove (44) is directed towards the second hole (24) and receives the steel ball (26), wherein the piston holder (30) is pushed over the steel ball (26) and is mounted in a way that prevents it from slipping out by blocking the blocking edges (22). bit holder after claim 1 , characterized in that the main body (11) comprises a shoulder (19) which is formed on the outside of the main body (11), and a ring (13) which fits tightly against the outside of the main body (11), the ring (13) and the shoulder (19) being arranged at a certain distance from one another; and in that the sliding sleeve (14) comprises a rib (40) which is raised on the inside of the sliding sleeve (14) and arranged between the ring (13) and the shoulder (19), and a compression spring (47) which is inserted over the outside of the main body (11), the compression spring (47) being supported on the ring (13) and, in the normal position, pressing the rib (40) such that the rib (40) is adjacent to the shoulder (19). bit holder after claim 1 , characterized in that the main body (11) is connected to a shaft (12), the shaft (12) closing one end of the central hole (20) to prevent the piston holder (30) from undesirably slipping out of the main body (11). bit holder after claim 1 , characterized in that the main body (11) is connected to a handle, the handle closing one end of the central hole (20) to prevent the piston holder (30) from undesirably slipping out of the main body (11). bit holder after claim 3 , characterized in that the piston holder (30) further comprises: - a pin (33) extending from one end of the piston holder (30) and thus located at the end different from the end with the magnet (32); and - an elastic element (34) which is inserted over the pin (33) and is supported on the shaft (12), wherein the elastic element (34) presses the magnet (32) of the piston holder (30) such that the magnet (32) in the normal position moves towards the polygonal hole (21) of the main body (20). bit holder after claim 4 , characterized in that the piston holder (30) further comprises: - a pin (33) extending from one end of the piston holder (30) and thus located at the end different from the end with the magnet (32); and - an elastic element (34) which is inserted over the pin (33) and is supported on the handle, wherein the elastic element (34) presses the magnet (32) of the piston holder (30) such that the magnet (32) in the normal position moves towards the polygonal hole (21) of the main body (20).

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