Bit holder

Abstract

Bit holder, comprehensive - 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 connected to the central hole (20); several blocking edges (22) formed at the point where the polygonal hole (21) 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 includes a movement hole (42) which receives the places of the main body (11) forming the first and second holes (23, 24), a groove (44) which is formed 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 is movable 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 inserted over the steel ball (26) and is mounted in a slip-proof manner by the blocking of the blocking edges (22).

Description

Technical area

[0001] The invention relates to a coupling for connecting two tools, in particular a bit holder. State of the art

[0002] US 9,731,356 B2 discloses a tool connector comprising a tool receiving part arranged to be movable back and forth between a first fixing position and a second fixing position.

[0003] In the normal position, the tool holder part is in the first fixing position and can be moved into the second fixing position.

[0004] The tool holder further comprises a magnetic mechanism and a locking mechanism, wherein the magnetic mechanism comprises a pendulum device and a plug. The pendulum device is installed in the tool holder such that it can be moved 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.

[0005] The locking mechanism consists of two counter-rotating balls. 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, locking the screwdriver bit.

[0006] 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, wherein the first ball is caused to engage in a third notch on the screwdriver bit in order to connect the screwdriver bit to the aforementioned device for locking and unlocking a screwdriver 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 counter-moving second balls.

[0007] When unlocked, the first ball is released from the third notch, and the second notch is no longer locked by the second two balls. Under the action of the mechanism, the screwdriver bit moves away from the locking / unlocking mechanism and attracts the moving part, causing the moving part to move 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, allowing the moving part to remain in the locking / unlocking mechanism. Object of the invention

[0008] 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

[0009] 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.

[0010] 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 locking edges formed where the polygonal hole and the center hole intersect; a first hole penetrating the main body toward two opposite corners of the polygonal hole; and a second hole penetrating 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 that receives the first and second hole-forming portions of the main body; a groove recessed in the wall of the moving hole; and a conical hole through which the moving hole and an opening of the sliding sleeve communicate. The piston holder is inserted into the center hole and reciprocally movable therein, and includes a magnet arranged on the piston holder. The ball is inserted into the first hole such 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 center 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 inserted over the steel ball and is mounted so that it cannot slip out by blocking the blocking edges.

[0011] 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 pressing the rib in the normal position so that the rib is adjacent to the shoulder.

[0012] Preferably, a shaft is combined with one end of the center hole to prevent the plunger holder from accidentally slipping out of the main body. The plunger holder further comprises a pin extending from one end of the plunger holder, thus located at the end different from the end with the magnet. An elastic element is placed over the pin and rests against the shaft, wherein the elastic element presses the magnet of the plunger holder such that the magnet, in the normal position, moves toward the polygonal hole of the main body. Short description of the drawings Fig. 1 shows an exploded view of a preferred embodiment of a bit holder according to the invention. Fig. 2 shows a perspective view of the bit holder according to the invention in Fig. 1 in assembled condition. Fig. 3 shows a sectional view of the internal structure of the bit holder according to the invention in Fig. 1 in assembled condition. Fig. 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. Fig. 5 shows a perspective view of the bit holder according to the invention to illustrate the coupling of the components inside the bit holder. Fig. 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

[0013] Objects, features, and advantages of the present invention will be explained in more detail below 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 illustration in the accompanying drawings.

[0014] In Fig. Figure 1 shows a preferred embodiment of a bit holder 10 according to the invention. 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.

[0015] In the interior of the main body 11 there is a center hole 20 (see Fig. 3) and a polygonal hole 21, these two holes 20, 21 communicating with each other. The main body 11 is a tube. In this exemplary embodiment, the polygonal hole 21 is a hexagonal hole, wherein the distance between two opposite corners is greater than the diameter of the center hole 20. The polygonal hole 21 has six edges, wherein the distance between two opposite sides is smaller than the diameter of the center hole 20. The respective side crosses the center hole 20 such that a blocking edge 22 is created, wherein six blocking edges 22 are provided at the center hole 21.

[0016] In this embodiment, the shaft 12 is a hexagonal pin on which a circumferential notch 17 is recessed. As can be seen from Fig. 2 and Fig. As can be seen in Figure 3, the six corners of the shaft 12 engage the walls of the center hole 20 such that the shaft 12 is securely joined to the main body 11. 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.

[0017] In a further embodiment, it is conceivable to use a round shaft 12 which sits in one end of the center hole 20 in such a force-fitting manner that the shaft 12 is connected to the main body 11 in a way that prevents it from slipping out.

[0018] 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.

[0019] As in Fig. 1 and Fig. 3, the piston holder 30 is inserted into the central 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 central hole 20. On an imaginary central axis of the central 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 extending from one end of the piston holder 30 and directed toward 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 being located at the two ends of the piston holder 30.

[0020] In this embodiment, the elastic element 34 is also a compression spring. The elastic element 34 is inserted into the central hole 20 such that it is inserted over the pin 33. The elastic element 34 rests against the shaft 12 (or the handle) and, in the normal position, presses the piston holder 30 so that the piston holder 30 moves toward the opening of the polygonal hole 21.

[0021] As in Fig. As shown in Figure 3, the main body 11 is configured 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 provided 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 having the thin sleeve wall extends through the ring 13, through the sliding sleeve 14, and through the compression spring 47.

[0022] As in Fig. As shown in Figure 1, the sliding sleeve 14 is a round sleeve. A serration (not shown) is provided on the outer circumferential surface of the round sleeve to increase friction. The serration can be knurled, for example. The serration ensures that the sliding sleeve 14 is secured against loosening.

[0023] As in Fig. 3, 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 mates 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.

[0024] The ring 13 rests tightly against the thin sleeve wall when the main body 11 is held immobile. The ring 13 blocks the opening of the annular space and is spaced a certain distance from the shoulder 19. Thus, the ring 13 becomes a base with which the compression spring 47 generates a force.

[0025] 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 enters the state in which force accumulates (see Fig. 6).

[0026] As in Fig. As shown in Figure 4, a first hole 23 and a second hole 24 are provided on the segment of the main body 11 having the thick sleeve wall, with the first and second holes 23, 24 passing through the thick sleeve wall. The compression spring 47 urges the sliding sleeve 14 such that the movement hole 42 accommodates the thick sleeve wall.

[0027] As in Fig. 5, the first hole 23 passes through the thick sleeve wall of the main body 11 in the direction of two opposite corners of the polygonal hole 21 and serves to receive the ball 25.

[0028] The movement hole 42 of the sliding sleeve 14 accommodates the main body segment with the thick sleeve wall, thereby blocking the openings of the first and second holes 23, 24. The movement hole 42 is connected to the end of a 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.

[0029] As in Fig. 3, 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.

[0030] As in Fig. 6, a groove 44 is formed on the wall of the movement hole 42 so that the exit of the groove 44 is directed toward the second hole 24. The groove 44 is provided for receiving the steel ball 26 that has returned into the second hole 24. At this time, the steel ball 26 protrudes no more than the center hole 20, so that the elastic element 34 presses the piston holder 30 so that the piston holder 30 exceeds the steel ball 26 and continuously advances toward 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 linear movement of the piston holder 30 relative to the main body 11.

[0031] With reference to Fig. Figure 1 explains the principle of handling the bit holder 10. 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, hexagon, square, Pozidriv, or other geometric shapes. The screwdriver bit 15 also has six corners and edges (not shown) on which corner notches 18 are formed.

[0032] As in Fig. 4 and Fig. As shown in Figure 6, the sliding sleeve 14 shifts under load with force from the main body segment with the thick sleeve wall toward 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 applied to the piston holder 30 such that the piston holder 30 overshoots the steel ball 26 and reaches the center hole 21. The blocking edges 22 now bear against the piston holder 30 such that the magnet 32 ​​is located in the center hole 21.

[0033] Now, the conical hole 45 is opposite the exit of the first hole 23, allowing the ball 25 to retract from the center hole 21. The screwdriver bit 15 is inserted into the polygonal hole 21 and, together with the plunger holder 30, is pushed deep into the center hole 20 of the main body 11. The pin 22 is located close to the shaft 12, with the plunger 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.

[0034] As in Fig. 4 and Fig. 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, 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, 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.

[0035] As in Fig. 3, 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.

[0036] As in Fig. As shown in Figure 2, 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.

[0037] As in Fig. As shown in Figure 6, the sliding sleeve 14 is subjected to a force such that it shifts 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, allowing the ball 25 to retract from the center hole 21, so that the ball 25 detaches from the corner notch 18. The screwdriver bit 15 is withdrawn from 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 retracts from the center hole 20, the elastic element 34 presses the plunger holder 30 into the plunger holder 30, with the blocking edges 22 separating the plunger holder 30 from the screwdriver bit 15 and interrupting the attraction of the magnet 32.

[0038] As in Fig.5, the polygonal hole 21 accommodates another screwdriver bit 15. When the sliding sleeve 14 is released, the compression spring 47 presses the sliding sleeve 14 such that the sliding sleeve 14 returns to its original 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 re-engages with the corner notch 18 of the screwdriver bit 15. Since the groove 44 is not exactly aligned with the second hole 24, the wall surface of the movement hole 42 prevents the steel ball 26 from retracting. Thus, the steel ball 26 protrudes from the center hole 20 and blocks the piston holder 30, allowing the magnet 32 ​​to freely attract the screwdriver bit 15.

[0039] The bit holder 10 according to the invention has the following advantages. First, 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. The bit holder 10 achieves similar locking and locking effects to the conventional tool coupling in US Pat. No. 7,424,841 B2 with fewer components, thus reducing manufacturing costs. Secondly, the blocking edges 22 block the piston holder 30 and 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 inlet and outlet 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 advantageous in comparison to the conventional tool coupling from US 9,731,356 B2.Thirdly, the ball 25 acts as strongly as two balls in US 9,731,356 B2 in locking the screwdriver bit 15, so that the same effect is achieved with fewer components, which contributes to reducing manufacturing costs.

[0040] Although the present invention has been described in detail using an exemplary embodiment, it will be understood by those skilled in the art that the invention is not limited to this exemplary embodiment. Rather, modifications are possible such that individual features can be omitted or other combinations of features can be implemented, as long as the scope 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 holders 11 Main body 12 shaft 13 rings 14 sliding sleeve 15 screwdriver bits 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 balls 26 steel balls 30 piston holders 31 round recess 32 Magnet 33 cones 34 elastic element 40 ribs 41 inner circumferential surface 42 Movement hole 43 Recording Chamber 44 groove 45 conical hole 46 Opening 47 compression spring QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 9,731,356 B2 [0002, 0039] US 7,424,841 B2 [0006, 0039]

Claims

[1] 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) and the central 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 central hole (20); - a sliding sleeve (14) which is slidably fitted over the main body (11) and which comprises a movement hole (42) which receives the positions 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) 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 inserted over the steel ball (26) and is mounted in a slip-proof manner by the blocking of the blocking edges (22). [2] Bit holder according to claim 1, characterized byin that the main body (11) comprises a shoulder (19) formed on the outside of the main body (11), and a ring (13) which lies closely against the outside of the main body (11), wherein the ring (13) and the shoulder (19) are 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), wherein the compression spring (47) is supported on the ring (13) and, in the normal position, presses the rib (40) such that the rib (40) is adjacent to the shoulder (19). [3] Bit holder according to claim 1, characterized bythat the main body (11) is connected to a shaft (12), wherein the shaft (12) closes one end of the central hole (20) in order to prevent the piston holder (30) from undesirably slipping out of the main body (11). [4] Bit holder according to claim 1, characterized by that the main body (11) is connected to a handle, wherein the handle closes one end of the central hole (20) in order to prevent the piston holder (30) from undesirably slipping out of the main body (11). [5] Bit holder according to claim 3, characterized by 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 placed 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) in such a way that the magnet (32) is displaced in the normal position in the direction of the polygonal hole (21) of the main body (20). [6] Bit holder according to claim 4, characterized by 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 placed over the pin (33) and is supported on the handle, wherein the elastic element (34) presses the magnet (32) of the piston holder (30) in such a way that the magnet (32) is displaced in the normal position in the direction of the polygonal hole (21) of the main body (20).

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