JP3054081U - Bit clamping device with auto self-lock - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a bit clamping device with an automatic self-lock that does not require a chuck key. SOLUTION: One chuck is connected to a driving shaft of a power source, one end of the chuck is connected to a screw surface having a conicity of an inner circumference of one upper impact ring, and a nail is combined with the rotating surface. It is possible to combine it with the seat, one impact piece and the upper impact ring are combined with each other with convex teeth, and the outer surface of the entire bit clamping device is provided with a light smooth surface suppression cover,
At the initial stage when the power source of the bit holding device is activated, the holding piece advances or retreats to hold or open the bit, and the impact piece is controlled by pressing the pressure suppression cover to control the bit. An intermittent torque can be generated.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a kind of electric drill and a similar bit clamping device with an automatic self-lock for a power tool.

[0002]

[Prior art]

 As shown in FIG. 1, a conventional bit holding structure of an electric drill includes a chuck 1 connected to a motor driving shaft, and a rotation adjusting ring 2 which rotates at one place is provided outside the chuck 1. A plurality of pawls 3 are provided inside the chuck 1, and the inner ends of the pawls 3 are combined with corresponding end faces of the chuck 1 by threads, and the plurality of pawls 3 are formed by rotating the rotation adjusting ring 2. The forward or backward movement can be controlled, and when the plurality of pawls 3 are contracted by their inclination during forward movement, the bit 4 placed between the pawls 3 can be pinched, and when the pawls 3 are retracted, the pawls 3 The bit 4 is opened so that the bit 4 can be taken out. In order to control the pawl 3 by the rotation of the rotation adjusting ring 2 in this manner, a ratchet 5 is provided on the upper end surface of the rotation adjusting ring 2, and a portion of the chuck 1 located in front of the ratchet 5 has a radial direction. A hole 6 is provided in the hole 6 so that an end of the chuck key 7 can be inserted into the hole 6 so as to be positioned. A bevel gear 8 meshing with the ratchet 5 is fitted into the end, and the chuck key 7 is inserted. By turning, the rotation adjustment ring 2 is turned in a predetermined direction so that the reciprocation of the pawl 3 can be controlled.

However, such a conventional bit holding device for an electric drill cannot hold or open the bit 4 unless a chuck key 7 provided separately is operated in combination with the chuck key 7. It is inconvenient and the chuck key 7 has a very small volume, so it is easy to lose it.

[0004]

[Problems to be solved by the invention]

 It is an object of the present invention to provide a kind of bit-clamping device with an auto-self-lock, which means that when the power source of the bit-clamping device is activated, the bit-clamping device automatically clamps or releases the bit. Therefore, there is no need to use a conventional chuck key, and the device can be more easily attached to and detached from the electric drill.

It is another object of the present invention to provide a kind of a bit clamping device with an auto-self-lock, which can generate an intermittent torque under control, save labor in drilling work and reduce obstacles in drilling work. Shall be effective to

[0006]

[Means for Solving the Problems]

 The invention of claim 1 is used for automatically clamping a bit provided on a main body provided with a power source 100, and is capable of being rotated in two directions by transmission of a driving shaft 12 of the power source 100. In the apparatus, the bit pinching device includes one chuck 10, one end of the chuck 10 is connected to the driving shaft 12, and the other end of the chuck 10 has a plurality of claws 20 having a screw surface 22 at an outer end. The upper impact ring 40 is fitted so as to be inclined in the axial direction, and the upper impact ring 40 is combined with the threaded surface 22 of the pawl 20 by a threaded surface 41 having a conicity of the inner periphery thereof so that the outer surface thereof can be rotated. A positioning cylinder 60 is provided at the outer end of the bit pinching device, and the bit pinching device is further formed as one impact piece 50, and the impact piece 50 is formed as a single ring, and the power of the upper impact ring 40 is Corresponds to source 100 And a plurality of convex teeth 43 and 54 meshing with each other on the opposing surfaces of the upper impact ring 40 and the impact piece 50, and a single elastic compression structure. The two end portions press the opposing surfaces of the impact piece 50 and the power source 100 to form a friction surface. A bit holding device with an automatic self-lock, comprising: And

According to a second aspect of the present invention, in the bit clamping device with an automatic self-lock according to the first aspect, a plurality of convex blocks 55 are provided on an outer end surface of the impact piece 50, and one suppression cover 80 is provided. Fitted outside the bit clamping device, the outer end surface of the pressure suppression cover 80 is a light smooth surface, and a plurality of lengths are longer than the convex mass 55 at a portion of the inner end surface corresponding to the convex mass 55 of the impact piece 50. A long groove 81 is formed and used to lock the convex block 55. A convex edge 82 extending inward in the radial direction is provided at a front end of the suppression cover 80, and an outer end of the chuck 10 is provided. One snap ring 64 is provided at a portion corresponding to the outside of the protruding edge 82 so as to position the suppression cover 80. When the suppression cover 80 is pressed from the outside, the impact piece 50 Does not rotate, and the bit pinching device intermittently A bit clamping device with an auto self-lock, characterized in that it generates torque.

According to a third aspect of the present invention, there is provided the bit clamping device with an automatic self-lock according to the first aspect, wherein the friction surface is composed of one annular lid 56 and a friction ring piece 57. A plurality of balls 561 are provided in the provided groove, and a friction ring piece 57 is separately fixed to the end of the casing of the power source 100, and a plurality of circular concave surfaces 572 and circular convex surfaces 573 are alternately provided on the end surface corresponding to the balls 561. An automatic self-locking bit holding device is characterized in that uneven surfaces are formed so as to be in contact with the ball 561.

[0009]

[Embodiment of the invention]

 The bit clamping device with an automatic self-lock according to the present invention includes one chuck, and one end of the chuck is connected to a driving shaft of a power source, and is caught on a thread surface having a conicity of an inner circumference of one upper impact ring. Is combined with the seat body in a rotatable manner, one impact piece and the upper impact ring are combined with each other with convex teeth, and a suppression cover with a light-smooth outer surface is provided outside the entire bit clamping device. In the initial stage when the power source of the bit pinching device is activated, the pinching piece moves forward or backward to pinch or open the bit, and the impact piece is controlled by pressing the pressure suppression cover. The bit can generate intermittent torque.

[0010]

【Example】

 The bit holding device of the present invention is used to hold a bit having a rotating action, for example, a drill, a reamer, a screwdriver, a tap, etc., but for convenience of explanation, the bit is described here as a bit for holding a drill. .

Please refer to FIG. 2, FIG. 3 and FIG. The device of the present invention includes at least the chuck 10, the pawl 20, the upper impact ring 40, the impact piece 50, the positioning cylinder 60, and the suppression cover 80. The chuck 10 has a fixed shaft end 11, and a connection hole 111 is provided in the fixed shaft end 11 in the axial direction to be connected to the driving shaft 12 of the power source 100, and one end of the fixed shaft end 11. An outwardly expanded board 13 is formed in the portion, and a groove 131 is formed annularly near the outer periphery of the board 13, and a washer 133 and a ball ring 132 are fitted into the groove 131, and The outer surface of the disc body 13 is further extended in the axial direction to provide a seat 14 having a base having a conical shape. The seat 14 is provided with a circular center hole 141 in the axial direction. An annular groove 142 is provided near the center, and a plurality of semicircular guide grooves 143 are provided at equal intervals along the axial direction of the seat 14 on the wall surface between the disk 13 of the seat 14 and the annular groove 142. The guide groove 143 is moved from the end corresponding to the board 13 to the seat 14. The guide groove 143 is inclined toward the center, and an end of the guide groove 143 corresponding to the annular groove 142 is formed as an oblong through hole 144, which communicates with the center hole 141, and is formed on the inner wall surface of the center hole 141. An arc groove 147 that is gradually shallow outwardly is provided in connection with the through hole 144, and an end of the guide groove 143 corresponding to the board 13 penetrates the board 13 and is placed on the board 13. One circular hole 145 is formed, and two locking grooves 146 and 146 ′ are provided near the outer end of the seat body 143.

A plurality of the claws 20 are provided and correspond to the guide grooves 143. The claws 20 have an elongated shape, and one end of one end thereof is a holding surface 21 and another part is a semicircle. A threaded surface 22 is provided on a partial end surface of the other end, and the claw 20 has an end portion having the clamping surface 21 and the convex mass 23 and a circular hole 145 of the disk body 13 of the chuck 10. Is inserted into the guide groove 143 and penetrates the through hole 144 into the center hole 141, and the outer end surface of the convex block 55 is slidably provided in the arc groove 147. The holding surfaces 21 of the claws 20 are each directed toward the center of the center hole 141, whereby the claws 20 are provided obliquely in the guide grooves 143.

The upper impact ring 40 has a threaded surface 41 having a conical degree on its inner peripheral surface, and is combined with the exposed threaded surface 22 of the pawl 20 combined with the seat 14 to be opposed to the seat 14. A recess 42 is provided at a position corresponding to the ball ring 132 of the upper impact ring 40, and the ball ring 132 is accommodated in the recess 42, around the bottom end surface of the upper impact ring 40, and the like. A plurality of convex teeth 43 on both sides are provided at intervals.

The impact piece 50 is formed as a single annular body, and the bottom surface of the impact piece 50 compresses one elastic compression structure. The ends press the opposing surfaces of the impact piece 50 and the power source 100 to form a friction surface. More specifically, one end of the spring 53 presses the impact piece 50 and the other end presses the annular lid 56, and a plurality of balls 561 fit into grooves provided on the bottom surface of the annular lid 56. An end face corresponding to the ball 561 of one friction ring piece 57 is an uneven end face in which a plurality of arc concave faces 572 and arc convex faces 573 are alternately arranged, and a plurality of holes 571 are provided on the outer periphery thereof. The impact piece 50 is attached to a fixing hole 101 provided at the outer end of the case of the power source 100 with a screw part 574 of the power source 100. 54 are provided and engaged with each other, and a convex mass 55 is formed outwardly along the convex teeth 54.

The positioning cylinder 60 has a hollow interior and is provided on the outer periphery of the seat body 14, both ends of which are open, and a snap ring 61 is provided in a locking groove 146 of the seat body 14. The positioning cylinder 60 is positioned in position, and the rust prevention cylinder 63 is fitted around the outer periphery of the seat body 14 to protect the bit holding device.

The pressure suppression cover 80 is made of a soft elastic material and has a conical cylindrical body having both open ends, and the outer surface thereof is a light smooth surface, and the inner peripheral surface is formed of a conical cylinder. A plurality of long grooves 81 longer than the plurality of convex blocks 55 are provided in portions corresponding to the convex blocks 55 on the outer periphery of the shooting piece 50 to lock the convex blocks 55, and the snap ring 61 at the front end of the suppression cover 80. A convex edge 82 extending inward in the radial direction is provided at a position corresponding to the upper portion of the chuck 10, and another snap ring 64 is provided in a locking groove 146 ′ corresponding to the convex edge 82 of the chuck 10. The outside of the protruding edge 82 is locked to position the suppression cover 80.

A description will be given of a main embodiment in which the drill 70 according to the present invention is a bit to be held. The drill 70 is inserted between the holding surfaces 21 of the claws 20 in the center hole 141 of the chuck 10. The driving shaft 12 of the power source 100 according to the present invention can be controlled to rotate forward or reverse. Here, suppose that the rotation direction in which the driving shaft 12 causes the drill 70 to perform the drilling operation is referred to as a working direction, and the opposite direction is referred to as a reaction direction. When the driving shaft 12 rotates in the working direction, the chuck 10 and the pawl 20 thereon rotate in conjunction with each other, and the upper impact ring 40 is restricted in position by the positioning cylinder 60 and the board 13 and cannot move in the axial direction. In the initial stage of the rotation of the chuck 10, the upper impact ring 40 is slightly rotated in the same direction as the chuck 10 under the influence of the high-speed rotation of the chuck 10, and the upper impact ring 40 and the plate 13 of the chuck 10 are rotated. A ball 132 is provided between them to provide a lubricating effect and to make the rotation even smoother. However, since the rotation speed of the chuck 10 is higher than the rotation speed of the upper impact ring 40, the pawl 20 is combined with the screw surface 41 having the conicity of the upper impact ring 40 at the screw surface 22 thereof, and the pawl 20 is formed in the guide groove. A movement in the direction of the drill 70 is generated along 143, and the pawl 20 is provided at an angle, so that the outer end of the pawl 20 gathers toward the center when moving forward. The holding of the drill 70 and the holding surface 21 increase the frictional force, so that the holding becomes stronger. The chuck 10 rotates continuously, the pawl 20 pinches the drill 70 more tightly and cannot move forward, and the threaded surface 22 of the pawl 20 has the conical degree of the upper impact ring 40. The upper impact ring 40 finally starts synchronous rotation with the chuck 10 by being engaged and positioned with the screw surface 41 to form a locked state. After the upper impact ring 40 starts rotating, the convex mass 43 thereunder is transmitted to the impact piece 50 to rotate.

When it is desired to take out the drill 70, the driving shaft 12 of the power source 100 is rotated in the opposite direction, and the screw surface 41 having the conicity of the upper impact ring 40 is originally the screw surface 22 of the pawl 20. Were rotated together with each other, but the rotation speed of the chuck 10 was high, and the rotation direction was a direction in which the screw surface 41 having a conical degree and the screw surface 22 of the pawl 20 were separated. Eventually, the screw surface 22 of the pawl 20 and the screw surface 41 having the conicality of the upper impact ring 40 are separated from the rotating state, and similarly, both the chuck 10 and the upper impact ring 40 are positioned. Therefore, the pawl 20 retreats in the direction of the circular hole 145 along the guide groove 143, and when retreating, the holding surface 21 of the pawl 20 gradually expands outward to open the drill 70. When the pawl 20 is retracted to a certain extent, the end of the convex block 23 on the pawl 20 is locked on the screw surface 41 having the conicity of the upper impact ring 40. At this time, the retraction limit of the pawl 20 is set. 20 will not escape.

The above-described operation of the pawl 20 moving forward in the direction of rotation of the driving shaft 12 to pinch the drill 70 and retreat to open the drill 70 achieves the purpose of holding and releasing the drill 70 when the power source 100 is started. Is done.

Regardless of the operation of holding and releasing the drill 70, when the impact piece 50 rotates, the spring 53 that presses against the lower part rotates according to this rotation, and the spring 53 further moves at the lower end thereof. The annular lid 56 to be pressed is rotated, and the ball 561 under the annular lid 56 rolls on the concave circular surface 572 and the convex circular surface 573 on the friction ring piece 57. When reaching the arc surface 573, the annular lid 56 presses the spring 53, and a pressing force is applied to the impact piece 50. The impact piece 50 further presses the upper impact ring 40, and the conicality of the upper impact ring 40 is reduced. The tooth side of the threaded surface 41 and the toothed side of the threaded surface 22 of the clamping surface 20 press against each other, eliminating the gap between the mutual teeth and further ensuring ratchet engagement. Therefore, the spring 53 presses the impact piece 50 forward by utilizing its own elasticity in the axial direction, a slight difference in elasticity when rotating, and indirect compression of the circular lid 56 of the arc-shaped convex surface 573.

Please refer to FIG. If the load is relatively large when the drill 70 rotates in the direction of action and executes the punching operation, the suppression cover 80 is pressed from outside to inside with a finger. Since the outer surface of the pressure suppression cover 80 is a light smooth surface, an injury at the time of pressing is prevented. By pressing the pressure suppression cover 80, the impact piece 50 is restricted and is not rotated (the spring 53, the annular lid 56, and the ball 561 are naturally also not rotated). However, when the drill 70 rotates with the chuck 10, the upper impact ring 40 also rotates. At this time, the convex teeth 43 of the upper impact ring 40 and the convex teeth 54 of the impact piece 50 perform an operation of sliding and pushing each other, When the two convex teeth 43 and 54 intersect, the upper impact ring 40 receives the resistance of rotation, so that the instantaneous rotational speed of the upper impact ring 40 becomes slow, and the rotational speed of the driving shaft 12 becomes slower, At the same time, the impact piece 50 is combined with the long groove 81 of the suppression cover 80 by the convex mass 55, and a sufficient length space in the long groove 81 is provided for the axial retreat of the impact piece 50, and the spring When the convex 53 is pressed and the convex teeth 54 of the impact piece 50 correspond to the recesses between the convex teeth 43 of the upper impact ring 40, the impact piece 50 is elastically recovered by the spring 53, and the convex teeth 54 are Locked between the convex teeth 43 of the upper impact ring 40, Ring 40 is restored to the state where there is no resistance, the rotational speed of the previously restored. In addition, the distance between the convex teeth 43 of the upper impact ring 40 is greater than the convex teeth 54 of the impact piece 50, and therefore, the drill 70 has two types of rotations: a perforation at the original rotational speed and a slow rotational speed. Perform alternate operation of.

After the intermittent torque operation is performed, the engagement between the threaded surface 22 of the pawl 20 and the threaded surface 41 of the upper impact ring 40 having a conical degree is further strengthened. When the power source 100 is controlled to rotate the driving shaft 12 in the reaction direction, the upper impact ring 40 continuously rotates with the pawl 20 and the threads of both do not come off, that is, the pawl 20 is Drill 70 cannot be released by retreating. At this time, if the suppression cover 80 is further grasped by hand, the impact piece 50 does not rotate, and at the same time, the power source 100 is controlled so that the driving shaft 12 rotates in the opposite direction, and the power source 100 rotates with the convex teeth 43 of the upper impact ring 40. When passing through the convex teeth 54 of the impact piece 50, the upper impact ring 40 receives rotational resistance, the driving shaft 12 rotates in the reaction direction, and the mutually meshing threads of the pawl 20 and the upper impact ring 40 are further separated. When the upper impact ring 40 is subjected to rotational resistance, the nail 20 and the upper impact ring 40 are loosened through the intersection of the convex teeth 43 and 54 several times, and the pawl 20 is retracted to cause the drill 70 to rotate. Can be taken out.

After the above-described intermittent torque operation, the engagement between the pawl 20 and the upper impact ring 40 is further strengthened, and the action of the tool is achieved when the bit is pinched by the bit pinching device and rotated in the reaction direction. I do. For example, a screw can be screwed into a workpiece when the driver is pinched and rotated in the working direction, and the screw is separated from the workpiece when the driver is pinched by a bit pinching device and rotated in the reaction direction. Therefore, when rotating the driver in the reaction direction with the bit holding device in the reaction direction, first hold the driver bit with the pawl 20 and then grasp the pressure suppression cover 80 by hand to intermittently operate the bit holding device. When the pawl 20 and the screw of the upper impact ring 40 are more strongly engaged with each other and the suppression cover 80 is loosened by hand utilizing this principle of operation, the power source 100 rotates the driving shaft 12 at a normal rotation speed. Can be rotated in the reaction direction and transmitted to the driver to remove the screw. Similarly, when it is desired to release the screwdriver from the pawl 20, the user further holds the suppression cover 80 with his / her hand, applies rotational resistance to the upper impact ring 40, and loosens the screw engagement between the pawl 20 and the upper impact ring 40. The pawl 20 can be retracted to separate the driver.

[0024]

[Effect of the invention]

 The bit clamping device with an automatic self-lock according to the present invention includes one chuck, and one end of the chuck is connected to a driving shaft of a power source, and is caught on a thread surface having a conicity of an inner circumference of one upper impact ring. Is combined with the seat body in a rotatable manner, one impact piece and the upper impact ring are combined with each other with convex teeth, and a suppression cover with a light-smooth outer surface is provided outside the entire bit clamping device. In the initial stage when the power source of the bit pinching device is activated, the pinching piece moves forward or backward to pinch or open the bit, and the impact piece is controlled by pressing the pressure suppression cover. With this structure, the bit pinching device automatically pinches or releases the bit at the initial stage when the power source of the bit pinching device is activated. Therefore, it is not necessary to use the conventional chuck key, and the operation of attaching and detaching the bit to and from the electric drill can be more easily performed.In addition, intermittent torque can be generated under control, and the drilling work can be reduced. It is effective in reducing obstacles in drilling work.

[Brief description of the drawings]

FIG. 1 is a perspective view of a conventional bit holding device for an electric drill.

FIG. 2 is an exploded perspective view of the first embodiment of the bit holding device of the present invention.

FIG. 3 is a combined perspective view of the first embodiment of the bit holding device of the present invention.

FIG. 4 is an operation display diagram in section along 4A-4A in FIG. 3;

FIG. 5 is a sectional view showing the operation of the first embodiment of the present invention;

[Explanation of symbols]

 Reference Signs List 10 chuck 11 shaft fixed end 111 connecting hole 12 driving shaft 13 panel body 131 groove 132 ball ring 133 washer 14 seat body 141 center hole 142 annular groove 143 guide groove 144 through hole 145 circular hole 147 arc groove 20 nail 146, 146 ' Stop groove 21 Nipping surface 22 Screw surface 23 Convex block 40 Upper impact ring 41 Screw surface with conicity 42 Recess 43 Convex tooth 50, 50 ′ Impact plate 53 Spring 55 Convex block 56, 56 ′ Ring cover 561 Ball 562 Spring plate 57 Friction ring piece 571 Hole 572 Arc concave surface 573 Arc convex surface 574 Screw component 60 Positioning cylinder 61 Snap ring 63 Rust prevention cylinder 64 Snap ring 70 Drill 80, 80 'Suppression cover 81 Long groove 82 Convex edge 83 Convex ring 84 Locking edge 100 Power Source 101 Lock hole

Claims (3)

[Utility model registration claims] 1. A bit pinching device provided on a main body having a power source 100 and used for automatically pinching a bit and receiving rotation of a driving shaft 12 of the power source 100 and rotatable in two directions. The bit clamping device includes one chuck 10, one end of which is connected to the driving shaft 12, and the other end of the chuck 10 has a threaded surface 22 at the outer end.
Are inserted so as to be inclined in the axial direction, and one upper impact ring 40 is combined with a screw surface 22 of the claw 20 by a screw surface 41 having a conicity of an inner circumference thereof, and an outer surface thereof is formed. It is rotatable, and one positioning cylinder 60 is provided at the outer end of the bit-clamping device. The bit-clamping device is further formed as one impact piece 50, and the impact piece 50 is formed as one ring. A plurality of convex teeth 43 and 54 are provided so as to be adjacent to a surface of the upper shock ring 40 corresponding to the power source 100, and mesh with each other on opposing surfaces of the upper shock ring 40 and the shock piece 50. , One elastic compression structure, which is a spring 53,
The two end portions press the opposing surfaces of the impact piece 50 and the power source 100 to form a friction surface. 2. The bit holding device with an automatic self-lock according to claim 1, wherein a plurality of convex blocks 55 are provided on an outer end surface of the impact piece 50, and one suppression cover 80 is provided outside the bit holding device. A long groove 81 having a plurality of lengths longer than that of the convex block 55 is provided on a portion of the inner end surface of the impact piece 50 corresponding to the convex block 55, the outer end surface of the pressure suppression cover 80 being a light smooth surface.
Is formed to be used to lock the convex block 55, and the convex edge 8 extending radially inward at the front end of the suppression cover 80.
2 is provided, and one snap ring 64 is provided at a portion corresponding to the outside of the convex edge 82 at the outer end of the chuck 10 so that the suppression cover 80 is positioned. A bit clamping device with an automatic self-lock, wherein the impact piece 50 does not rotate when pressed from outside, and the bit clamping device generates an intermittent torque. 3. The bit clamping device according to claim 1, wherein said friction surface has one annular lid.
6 and a friction ring piece 57, a plurality of balls 561 are provided in a groove provided on the bottom surface of the annular lid 56, and the friction ring piece 57 is fixed to the casing end of the power source 100 and A bit clamping device with an automatic self-lock, characterized in that an end surface corresponding to 561 is formed with an irregular surface in which a plurality of arc concave surfaces 572 and arc convex surfaces 573 are alternately arranged so as to come into contact with the ball 561.