Bit holder

Abstract

Bit holder, consisting of: - a main body (22) which is not magnetically conductive, wherein the main body (22) has a polygonal hole (23) which forms the front end of the main body (22) and a mounting cavity (25) which forms the rear end of the main body (22), wherein the mounting cavity (25) and the polygonal hole (23) are connected to each other; - a coupling shaft (21) which is fixed in the mounting cavity (25) and protrudes from the rear end of the main body (22); - a socket (11) which is not magnetically conductive, wherein the socket (11) has an insertion chamber (12) and a hole (13), wherein the receiving chamber (12) and the hole (13) are connected to each other, wherein the socket (11) is inserted into the mounting cavity (25); - a mounting seat (16) which is provided with a through hole (17), wherein the mounting seat (16) is inserted into the mounting cavity (25); - an elastic element (19) which is inserted into the mounting cavity (25), wherein the mounting seat (16) is in contact with the coupling shaft (21) by means of one end of the elastic element (19) and the bushing (11) is caused to move towards the polygonal hole (23) in the normal state by means of the other end of the elastic element (19); - a pin (15), one part of which is fixed in the hole (13) and the remaining part of which projects into the through hole (17); and - a magnet (10) which is installed in the insertion chamber (12), wherein the magnet (10) represents a closed end of the polygonal hole (23), which end is displaceable inside the polygonal hole (23), wherein the magnet (10) is in contact with the mandrel (15), wherein the magnetic force of the magnet (10) is transmitted via the mounting seat (16) to the coupling shaft (21).

Description

Technical area

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

[0002] TW M308146 U discloses a clutch assembly comprising a main body, a sliding sleeve, a magnet, an inner spring, and a shaft. A polygonal insertion hole is recessed at one end of the main body, and a through hole is arranged at the other end of the main body so as to penetrate deeply into the main body, the through hole and the insertion hole communicating with each other. The shaft is a polygonal portion that fits into the through hole such that the polygonal portion inserted into the through hole cannot move, thus forming a part of the main body. The magnet is inserted into the sliding sleeve, and the sliding sleeve and the inner spring are inserted into the through hole.One end of the inner spring presses against the shaft and the other end of it rests on the sliding sleeve, which causes the magnet to move towards the polygonal insertion hole in the normal state.

[0003] Normally the sliding sleeve and the shaft are separated by the inner spring, so that the magnet cannot magnetically attract the shaft.

[0004] When a screwdriver bit is partially inserted into the multi-edged insertion hole, the magnet will magnetically attract the end of the screwdriver bit. At the same time, the sliding sleeve returns to the inside of the through-hole, reducing the volume of the internal spring. This causes the sliding sleeve to remain at a certain distance from the shaft. Since the magnet does not magnetically attract the shaft, the magnetic force cannot be transferred to the shaft. Object of the invention

[0005] The invention is based on the object of creating a bit holder which provides a coupling structure for a magnet so that the magnetic force can be transmitted to the outer region of the bit holder. Technical solution

[0006] 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.

[0007] The invention provides a bit holder comprising a main body, a socket, a mounting seat, a mandrel, a magnet, and a coupling shaft. The main body and the socket are non-magnetically conductive, while the mounting seat, the mandrel, the magnet, and the coupling shaft are magnetically conductive. The main body has a polygonal hole forming the front end of the main body and a mounting cavity forming the rear end of the main body, the mounting cavity and the polygonal hole communicating with each other. The coupling shaft is fixed in the mounting cavity and protrudes from the rear end of the main body. The socket, the mounting seat, and an elastic member are jointly inserted into the mounting cavity. The socket has an insertion chamber and a hole, the receiving chamber and the hole communicating with each other. The mounting seat is provided with a through hole.One end of the elastic element engages the mounting seat with the coupling shaft, and the other end of the elastic element causes the bushing to normally slide toward the polygonal hole. Part of the mandrel is fixed in the hole, and the remaining part of the mandrel protrudes into the through hole. The magnet is installed in the insertion chamber and represents a closed end of the polygonal hole, which end can be moved inside the polygonal hole. The magnet is in contact with the mandrel. The magnetic force of the magnet is transmitted to the coupling shaft via the mounting seat.

[0008] In a preferred embodiment, the mounting seat and the coupling shaft are formed as a single piece. The through-hole is designed to extend deep into the coupling shaft. The mandrel penetrates deep into the through-hole and magnetizes the mounting seat and the coupling shaft without compromising magnetic conductivity. Short description of the drawings Fig. 1 shows a perspective view of a preferred embodiment of a bit holder according to the invention in the assembled state. Fig. 2 shows an exploded view of the bit holder according to the invention in Fig. 1. Fig. 3 shows a sectional view of the internal structure of the bit holder according to the invention in Fig. 1 before a movement. Fig. 4 shows a sectional view of the internal structure of the bit holder according to the invention in Fig. 1 before a movement from a wider angle. Fig. 5 shows a sectional view of the internal structure of the bit holder according to the invention in Fig. 1 after a movement. Fig. 6 shows a sectional view of the internal structure of the bit holder according to the invention in Fig. 1 after a movement from a wider viewing angle. Detailed description of a preferred embodiment

[0009] 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.

[0010] In Fig. 1 shows a preferred embodiment of a bit holder 20 according to the invention. A control knob 30 is arranged at the front end of the bit holder 20. The bit holder 20 has a coupling shaft 21 and a main body 22, wherein the coupling shaft 21 protrudes from the rear end of the bit holder 20. By moving the control knob 30 back and forth in a longitudinal direction of the bit holder 20 relative to a main body 22, a screwdriver bit 37 can be detachably connected to a polygonal hole 23 of the main body 22, as shown in Fig. 6 is shown.

[0011] As in Fig. 2, a magnet 10, a bushing 11, a mandrel 15, a mounting seat 16 and an elastic member 19 can be installed in the main body 22, provided the coupling shaft 21 is removed from the bit holder 20.

[0012] As in Fig. As shown in Figure 4, the main body 22 is a tube. The polygonal hole 23 is recessed at the front end of the main body 22 and communicates with the rear end of the main body 22 via a mounting cavity 25. The mounting cavity 25 is a round hole whose diameter is smaller than the diagonal distance of the polygonal hole 23 and larger than the distance between two opposite sides thereof. The main body 22 has a plurality of blocking parts 36, each adjacent to the sides of the polygonal hole 23 and the wall surfaces of the mounting cavity 24.In the radial direction of the main body 22, a detent hole 24 and a positioning hole 26 are formed, wherein the detent hole 24 extends from an angle (not designated by a reference numeral) of the polygonal hole 23 to the outside of the main body 22, wherein the positioning hole 26 is connected to the outer surface of the main body 22, this connection point extending to the area of ​​the polygonal hole 23, which area borders the mounting cavity 25. A shoulder 29 is formed on the outer surface of the main body 22 in the shape of an annular surface, wherein the shoulder 29 is formed due to the gradient of the diameter.

[0013] The coupling shaft 21 is a hexagonal section, with the diagonal distance of the coupling shaft 21 being slightly larger than the diameter of the mounting cavity 25, so that the mounting cavity 25 is blocked with a portion of the coupling shaft 21, thereby securing the coupling shaft 21 to the main body 22. The remainder of the coupling shaft 21 protrudes from the rear end of the main body 22 and is removably connected to a receiving end of a tool (not shown), e.g., a hand, pneumatic, or power tool.

[0014] In the preferred embodiment, the elastic element is a compression spring. One end of the elastic element 19 is pulled over a cylinder 14 of the bushing 11, and the other end of the elastic element 19 is pulled over a portion 18 of the mounting seat 16, the diameter of the portion 18 being relatively smaller than the diameter of the remaining portion of the mounting seat 16.

[0015] When the bushing 11, the fastening seat 16, and the elastic member 19 are inserted into the mounting cavity 25, the coupling shaft 21 exerts a force on the fastening seat 16 to counteract the elastic force of the elastic member 19 acting on the fastening seat 16. The fastening seat 16 presses against the end surface of the coupling shaft 21 such that the end surface of the coupling shaft 21 does not move. The bushing 11 receives the elastic force of the elastic member 19 and, in the normal state, slides toward the polygonal hole 23. Because the blocking parts 36 block the end surface of the bushing 11, the bushing 11 is prevented from jumping out of the main body 22.

[0016] The magnet 10 is inserted into an insertion chamber 12 of the bushing 11, with the insertion chamber 12 and the cylinder 14 located at both ends of the bushing 11. When the bushing 11 is inserted into the mounting cavity 25, the magnet 10 represents a closed end of the polygonal hole 23, which end is movable within the polygonal hole 23.

[0017] A portion of the mandrel 15 is fixed in a hole 13 of the bushing 11, which hole 13 communicates with the insertion chamber 12. The magnet 10 is in contact with the mandrel 15. When the bushing 11 is inserted into the mounting cavity 25, the remaining portion of the mandrel 15 protrudes from the cylinder 14 and thus extends into a through-hole 17 of the mounting seat 16, which through-hole 17 passes through the small-diameter portion 18 and the mounting seat 16.

[0018] In the preferred embodiment, the bushing 11 and the main body 22 are made of non-magnetic material, e.g., a high-chromium austenitic steel (No. 302, 304), so that the bushing 11 and the main body 22 are not magnetically conductive. The mandrel 15, the mounting seat 16, and the coupling shaft 21 are like the screwdriver bit 37 (see Fig. 6) made of ferromagnetic material, e.g. iron (Fe), nickel (Ni), cobalt (Co) and alloys of these metals, so that the mandrel 15, the fastening seat 16 and the coupling shaft 21 are magnetically conductive.

[0019] According to the first law of magnetism, unlike poles attract and like poles repel. A south pole S of magnet 10 attracts a north pole N of mandrel 15, or a north pole N of magnet 10 attracts a south pole S of mandrel 15. In this way, mandrel 15 can be converted into another magnet. The magnetic field of mandrel 15 can magnetize mounting seat 16 so that the south pole S of mounting seat 16 attracts the north pole N of coupling shaft 21, or the north pole N of mounting seat 16 attracts the south pole S of coupling shaft 21. In this way, coupling shaft 21 can magnetically attract the receiving end of the tool.

[0020] As in Fig. As shown in Figure 6, the screwdriver bit 37 is connected to the polygonal hole 23. The magnet 10 attracts the screwdriver bit 37 so that the screwdriver bit 37 reaches deep into the end face of the polygonal hole 23, causing the bushing 11 to move toward the coupling shaft 21. As the bushing 11 approaches the mounting seat 16, the elastic element 19 is compressed to a smaller volume. The mandrel 15 penetrates deep into the through-hole 17 and further magnetizes the mounting seat 16. The mounting seat 16 magnetically attracts the coupling shaft 21, and the coupling shaft 21 continues to retain the magnetic force.

[0021] Further reference is made to Fig. 2. When the control knob 30 is detached from the main body 22, two steel balls on the outside of the main body 22 and another compression spring 35 with a larger diameter are removed, wherein the two steel balls are defined as detent ball 27 and positioning ball 28, respectively, for the purpose of more detailed description.

[0022] In this case, a round opening in the interior of the control button 30 is considered as a through-opening 31, on the wall surface of which an annular spring receptacle 32 is recessed, one end of the spring receptacle 32 forming a conical surface 33 and the other end thereof forming an almost vertical annular surface 34.

[0023] Further reference is made to Fig. 3. When the control button 30 is inserted over the outside of the main body 22, the annular surface 34 is closer to the shoulder 29, with the annular surface 34 and the shoulder 29 together compressing the compression spring 35. In this case, the compression spring 35 is also inserted over the outside of the main body 22. Furthermore, the spring receptacle 32 also serves to accommodate the detent ball 27. The detent ball 27 can freely enter and exit the detent bore 24.

[0024] Further reference is made to Fig. 4. Although the bushing 11 is blocked by the blocking parts 36 so that it does not jump out of the main body 22, the outer peripheral surface of the bushing 11 blocks the positioning hole 26, allowing the positioning hole 26 to receive the positioning ball 28. One end of the positioning ball 28 is in contact with the bushing 11, and the other end thereof protrudes from the main body 22 such that the positioning ball 28 protrudes from the outer surface of the main body 22 and thereby presses against the end part of the control knob 30. Thus, a force from the main body 22 acts on the positioning ball 28 to resist the force of the compression spring 35 output via the control knob 30. Therefore, the control knob 30 remains immovable on the main body 22.

[0025] As from Fig. 6, the magnet 10 is located inside the polygonal hole 23 and moves with the continuous deep penetration of the screwdriver bit 37.

[0026] Subsequently, the bushing 11 moves toward the coupling shaft 21 and no longer blocks the positioning hole 26, so that the positioning ball 28 can no longer be supported by the bushing 11. The compression spring 35 returns to its original position and releases the elastic force with which the control knob 30 is driven so that the control knob 30 moves relative to the main body 22. The control knob 30 covers an opening of the positioning hole 26, so that the positioning ball 28 protrudes from the main body 22 through another opening of the positioning hole 26. The end face of the bushing 11 is blocked by the positioning ball 28 so that it resists the force acting on the bushing 11 from the elastic element 19.

[0027] Further reference is made to Fig. 5. The conical surface 33 pushes the locking ball 27 such that the locking ball 27 partially protrudes from the polygonal hole 23 and engages one of the notches 38 on the outside of the screwdriver bit 37, thereby preventing the screwdriver bit 37 from becoming detached from the front end of the main body 22. The magnet 10 now magnetically attracts the screwdriver bit 37, so that the screwdriver bit 37 becomes another magnet that magnetically attracts a fastening element (not shown), the fastening element here being, for example, a threaded bolt, a set screw, or a screw.

[0028] It is conceivable to form the mounting seat 16 and the coupling shaft 21 as a single piece. The through hole 17 extends deep into the coupling shaft 21, and the mandrel 15 penetrates deep into the through hole 17 to magnetize the mounting seat 16 and the coupling shaft 21 without impairing the magnetic conductivity.

[0029] 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 Magnet 11 socket 12 Insertion chamber 13 holes 14 cylinders 15 Thorn 16 Mounting seat 17 through hole 18 small diameter section 19 elastic element 20 bit holders 21 Coupling shaft 22 main bodies 23 polygonal hole 24 locking hole 25 Mounting cavity 26 Positioning hole 27 locking ball 28 Positioning ball 29 Shoulder 30 Control button 31 passage opening 32 spring retainer 33 Conical surface 34 ring area 35 compression spring 36 Blocking part 37 screwdriver bits 38 notch

Claims

[1] Bit holder, consisting of: - a main body (22) which is not magnetically conductive, the main body (22) having a polygonal hole (23) forming the front end of the main body (22) and a mounting cavity (25) forming the rear end of the main body (22), the mounting cavity (25) and the polygonal hole (23) communicating with each other; - a coupling shaft (21) fixed in the mounting cavity (25) and protruding from the rear end of the main body (22); - a socket (11) which is not magnetically conductive, the socket (11) having an insertion chamber (12) and a hole (13), the receiving chamber (12) and the hole (13) communicating with each other, the socket (11) being inserted into the mounting cavity (25); - a mounting seat (16) provided with a through hole (17), the mounting seat (16) being inserted into the mounting cavity (25); - an elastic element (19) inserted into the mounting cavity (25), wherein the fastening seat (16) is in contact with the coupling shaft (21) by means of one end of the elastic element (19) and the bushing (11) is caused to move in the normal state towards the polygonal hole (23) by means of the other end of the elastic element (19); - a mandrel (15), one part of which is fixed in the hole (13) and the remaining part of which projects into the through hole (17); and - a magnet (10) installed in the insertion chamber (12), the magnet (10) constituting a closed end of the polygonal hole (23), which end is displaceable inside the polygonal hole (23), the magnet (10) being in contact with the mandrel (15), the magnetic force of the magnet (10) being transmitted to the coupling shaft (21) via the fastening seat (16). [2] Bit holder according to claim 1, characterized bythat the fastening seat (16) and the coupling shaft (21) are formed in one piece, wherein the through hole (17) extends deep into the coupling shaft (21).

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