A chuck and a power screwdriver

Abstract

The application provides a chuck and a power screwdriver, and belongs to the technical field of power screwdrivers. The chuck comprises a main body, the inside of the main body is a hollow structure, the main body is provided with through grooves penetrating the side wall in the radial direction, each through groove is correspondingly provided with a clamping jaw inside, the clamping jaw is provided with an inclined part on one side outside the main body, the inclined part is arranged as a lower slope with a thickness gradually decreasing relative to the central axis of the main body in the direction of the bit inserted into the main body, and the clamping jaw is provided with a protrusion on one side inside the main body, which is matched with the clamping groove on the bit. The chuck of the application is provided with the inclined part and the protrusion on the clamping jaw, the inclined part is first pressed to make the clamping jaw press down, and then the protrusion is contacted and matched with the clamping groove on the bit to make the clamping jaw press the bit as a whole, no gap is left between the chuck and the bit, the clamping is stable, the bit does not shake, and the situation that the bolt is inclined during the fastening operation and the efficiency of the fastening operation of the operator is reduced is avoided.

Description

Technical Field

[0001] This application relates to the field of clamping structure technology, and in particular to a chuck and an electric screwdriver. Background Technology

[0002] An electric screwdriver, also known as an electric screwdriver or electric screwdriver, is a power tool used for tightening and loosening screws. This power tool is equipped with a torque adjustment and limiting mechanism and is mainly used on assembly lines, making it an essential tool for most manufacturing companies. It typically includes a chuck, a drill body, a drive mechanism located within the drill body, and a handle. The chuck has a chuck cavity for holding the screwdriver bit, which tightens or loosens the screw.

[0003] Before using an electric screwdriver, a suitable bit needs to be installed. In existing technology, the motor in the electric screwdriver usually drives the bevel gear to rotate. When the motor rotates forward, the bevel gear drives the flat thread to rotate, and the jaws move along the thread groove towards the center to clamp the bit. When the motor rotates in reverse, the jaws move in the opposite direction to release the bit.

[0004] However, the chuck in the relevant technology has a technical problem: unstable clamping causes the bit to wobble, resulting in the bolt tilting during tightening and requiring retightening. Utility Model Content

[0005] This application provides a chuck and an electric screwdriver to solve the technical problem in the prior art where, when the chuck clamps the screwdriver bit, there is a gap between the chuck and the screwdriver bit, which leads to unstable clamping, causing the screwdriver bit to wobble and the bolt to tilt during tightening, thus requiring re-tightening.

[0006] The embodiments of this application provide the following technical solutions to solve the above-mentioned technical problems: A chuck includes a main body with a hollow interior. The main body has a through-slot extending through the sidewall in a radial direction. Each through-slot has a corresponding gripper. The gripper has an inclined portion on the side outside the main body. Along the direction in which the bit is inserted into the main body, the inclined portion is configured as a downward slope with its thickness decreasing sequentially relative to the central axis of the main body. The gripper has a protrusion on the side inside the main body that mates with a slot on the bit.

[0007] The beneficial effects of the embodiments of this application are as follows: The chuck provided in the embodiments of this application replaces the traditional three-jaw chuck. Compared with the prior art, the chuck of this application has inclined parts and protrusions on the jaws. The inclined parts are pressed first, causing the jaws to press down, which in turn drives the protrusions to contact and cooperate with the slots on the bit, so that the jaws as a whole press the bit tightly. There are no gaps between the chuck and the bit, the clamping is stable and the bit does not wobble, avoiding the situation where the bolt tilts during the tightening operation, thereby reducing the efficiency of the operator's tightening operation.

[0008] Furthermore, the main body is provided with a locking sleeve that slides along its outer wall. In its natural state, the locking sleeve presses the jaws together by pressing the inclined portion; when force is applied to the locking sleeve, the locking sleeve releases the jaws by separating from the inclined portion.

[0009] Furthermore, the tail end of the main body is provided with a base for connecting with the screwdriver drill body, and the outer wall of the base is slidably connected to the inner wall of the lock sleeve.

[0010] Furthermore, the base is provided with a first step surface and a second step surface, the cross-section of the first step surface is larger than the cross-section of the second step surface, the lock sleeve is provided with a third step surface that cooperates with the first step surface, and the main body and the base are connected through the second step surface.

[0011] Furthermore, a spring-loaded structure is provided between the base and the locking sleeve.

[0012] Furthermore, the springback structure includes a first spring, a first stepped surface, and a third stepped surface, with the first spring located between the first stepped surface and the third stepped surface.

[0013] Furthermore, a pin is provided between the tail ends of the grippers, and a second spring is provided on the side of the pin near the base, and on the side away from the base, it is used to press against the tail end of the bit.

[0014] Furthermore, the protrusion is an arc-shaped protrusion.

[0015] Furthermore, the ejector pin has a frustum structure and a cylindrical structure on the side away from the base, and the end of the gripper has a gripping block that cooperates with the frustum structure to hold it in place, while the cylindrical structure is used to press against the end of the bit.

[0016] This application embodiment also provides an electric screwdriver, including the aforementioned chuck, which is detachably connected to the front end of the screwdriver's drill body via a base.

[0017] The beneficial effects of the electric screwdriver provided in this application embodiment are the same as those of the chuck described above, and will not be repeated here.

[0018] In addition to the technical problems solved by this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems that can be solved by the chuck and electric screwdriver provided by this application, other technical features contained in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of this application. Figure 1 (The locking sleeve clamps the jaws); Figure 2 This is a schematic diagram of the structure of an embodiment of this application. Figure 2 (The locking sleeve did not press the clamping jaws tightly); Figure 3 for Figure 1 The main view; Figure 4 for Figure 3 A cross-sectional view of the AA plane; Figure 5 This is a schematic diagram of the structure of an embodiment of this application. Figure 3 (Missing lock and clamps); Figure 6 This is a schematic diagram of the structure of an embodiment of this application. Figure 4 .

[0021] Explanation of reference numerals in the attached figures: 1. Main body; 2. Through groove; 3. Gripper; 4. Inclined part; 5. Protrusion; 6. Locking sleeve; 7. Base; 8. Screw; 9. First step surface; 10. Second step surface; 11. Third step surface; 12. First spring; 13. Ejector pin; 14. Second spring; 15. End cap; 16. Through hole; 17. Frustum structure; 18. Clamping block; 19. Cylindrical structure.

[0022] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] like Figure 1-6As shown, the chuck provided in this embodiment includes a main body 1. The main body 1 has a hollow structure inside. The main body 1 has three through slots 2 that penetrate the side wall in the radial direction. Each through slot 2 has a corresponding gripper 3 inside. The gripper 3 has an inclined part 4 on the side located outside the main body 1. Along the direction in which the bit is inserted into the main body 1, the inclined part 4 is set as a downward slope with its thickness decreasing sequentially relative to the central axis of the main body 1. The gripper 3 has a protrusion 5 on the side located inside the main body 1 that cooperates with the slot on the bit.

[0025] It should be noted that the through slots 2 on the main body 1 are not limited to three, but can be four, five, six, etc. In order to better ensure the clamping effect, the protrusion 5 is an arc-shaped protrusion.

[0026] In this embodiment, the chuck has an inclined portion 4 and a protrusion 5 on the jaw 3. First, the inclined portion 4 is pressed down, causing the jaw 3 to press down, which in turn drives the protrusion 5 to contact and engage with the slot on the bit, so that the jaw as a whole presses the bit tightly. There is no gap between the chuck and the bit, the clamping is stable and the bit does not wobble, avoiding the situation where the bolt tilts during the tightening operation, thereby reducing the efficiency of the operator's tightening operation.

[0027] The main body 1 is provided with a locking sleeve 6 that slides along its outer wall. In its natural state, the locking sleeve 6 presses the clamping claw 3 by pressing the inclined part 4; when force is applied to the locking sleeve 6, the locking sleeve 6 releases the clamping claw 3 by separating from the inclined part 4.

[0028] The main body 1 has a base 7 at its tail end for connecting with the screwdriver drill body. The outer wall of the base 7 is slidably connected to the inner wall of the locking sleeve 6. The chuck can be installed on the electric screwdriver through the base 7.

[0029] The base 7 is provided with a first step surface 9 and a second step surface 10. The cross-section of the first step surface 9 is larger than the cross-section of the second step surface 10. The locking sleeve 6 is provided with a third step surface 11 that cooperates with the first step surface 9. The main body 1 and the base 7 are connected through the second step surface 10.

[0030] A spring-loaded mechanism is also provided between the base 7 and the locking sleeve 6.

[0031] The springback structure includes a first spring 12, a first stepped surface 9, and a third stepped surface 11, with the first spring 12 located between the first stepped surface 9 and the third stepped surface 11.

[0032] By setting a first spring 12, a first step surface 9, and a third step surface 11, when no force is applied to the locking sleeve 6, the distance between the third step surface 11 and the first step surface 9 is the largest, and the first spring 12 is in a non-compressed state between the first step surface 9 and the third step surface 11. At this time, the locking sleeve 6 presses the clamping jaw 3. When force is applied to the locking sleeve 6, the third step surface 11 gradually approaches the first step surface 9, and the first spring 12 is gradually compressed. When the locking sleeve 6 can no longer move, the first spring 12 is fully compressed, and the first spring 12 is in a fully compressed state between the first step surface 9 and the third step surface 11. At this time, the distance between the third step surface 11 and the first step surface 9 is the smallest, and the locking sleeve 6 releases the clamping jaw 3.

[0033] A pin 13 is provided between the tail ends of the jaws 3. The pin 13 has a second spring 14 on the side near the base 7 and is used to press the tail end of the bit on the side away from the base 7.

[0034] The bit is pressed down by the elastic force of the compressed second spring 14, thereby ensuring the stability of the chuck's grip on the bit.

[0035] The main body 1 has an end cap 15 connected to it at the entry end. The end cap 15 is used to hold the gripper 3 in the through groove 2 to prevent the gripper 3 from falling out.

[0036] The base 7 has a through hole 16 inside for placing screws 8, and the base 7 is connected to the screwdriver drill body by screws 8.

[0037] The ejector pin 13 has a frustum structure 17 and a cylindrical structure 19 on the side away from the base 7. The end of the gripper 3 has a gripping block 18 that cooperates with the frustum structure 17 to hold it. The cylindrical structure 19 is used to press against the end of the bit.

[0038] By setting the frustum structure 17, the tail end of the gripper 3 can better contact the ejector pin 13, thereby better gripping the bit and ensuring the stability of the gripping.

[0039] In this embodiment, the locking sleeve 6 is first pulled to disengage it from the clamping jaws 3. Then, the bit is inserted into the chuck. The locking sleeve 6 is then released, and under the action of the spring-loaded structure, it regains its elasticity and moves towards the clamping jaws 3, pressing them firmly. At this point, the bit inside the chuck is stably clamped and fixed by the squeezing force between the jaws 3, completing the installation. During operation, the bit will not wobble due to unstable clamping, ensuring that the bolt will not tilt during tightening and guaranteeing reliable bolt installation.

[0040] An electric screwdriver includes a chuck that is detachably connected to the front end of the screwdriver's drill body via a base 7.

[0041] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0042] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A chuck, characterized in that, Includes a main body (1), the interior of which is a hollow structure. The main body (1) has a through groove (2) that penetrates the side wall in the radial direction. Each through groove (2) has a corresponding gripper (3). The gripper (3) has an inclined part (4) on the side located outside the main body (1). Along the direction in which the bit is inserted into the main body (1), the inclined part (4) is set as a downward slope with its thickness decreasing sequentially relative to the central axis of the main body (1). The gripper (3) has a protrusion (5) on the side located inside the main body (1) that cooperates with the slot on the bit.

2. The chuck according to claim 1, characterized in that, The main body (1) is provided with a locking sleeve (6) that slides along its outer wall. In its natural state, the locking sleeve (6) presses the clamping claw (3) by pressing the inclined part (4). When force is applied to the locking sleeve (6), the locking sleeve (6) releases the clamping claw (3) by separating from the inclined part (4).

3. The chuck according to claim 1, characterized in that, The main body (1) has a base (7) at its tail end for connecting with the screwdriver drill body, and the outer wall of the base (7) is slidably connected to the inner wall of the lock sleeve (6).

4. The chuck according to claim 3, characterized in that, The base (7) is provided with a first step surface (9) and a second step surface (10). The cross-section of the first step surface (9) is larger than the cross-section of the second step surface (10). The lock sleeve (6) is provided with a third step surface (11) that cooperates with the first step surface (9). The main body (1) and the base (7) are connected through the second step surface (10).

5. The chuck according to claim 4, characterized in that, A spring-loaded structure is also provided between the base (7) and the locking sleeve (6).

6. The chuck according to claim 5, characterized in that, The rebound structure includes a first spring (12), a first step surface (9) and a third step surface (11), with the first spring (12) located between the first step surface (9) and the third step surface (11).

7. The chuck according to claim 1, characterized in that, A pin (13) is provided between the tail ends of the gripper (3). The pin (13) has a second spring (14) on the side near the base (7) and is used to press the tail end of the bit on the side away from the base (7).

8. The chuck according to claim 1, characterized in that, The protrusion (5) is an arc-shaped protrusion.

9. The chuck according to claim 7, characterized in that, The ejector pin (13) has a frustum structure (17) and a cylindrical structure (19) on the side away from the base (7). The end of the gripper (3) is provided with a clamping block (18) that cooperates with the frustum structure (17) to clamp. The cylindrical structure (19) is used to press against the end of the bit.

10. An electric screwdriver, characterized in that, Includes the chuck as described in any one of claims 1-9, wherein the chuck is detachably connected to the front end of the screwdriver's drill body via a base (7).

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