An electric screwdriver

Abstract

This utility model relates to the field of screwdriver technology, and more particularly to an electric screwdriver, including a motor and a screwdriver bit. A limiting component is provided at the end of the motor, and the output end of the motor passes through the limiting component. The output end of the motor and the screwdriver bit are connected via a connecting component. A protective cylinder is connected to the end of the limiting component. The protective cylinder includes an outer cylinder and an inner cylinder that are screwed together. A locking component is provided on the outer side of the inner cylinder to limit the position between the outer and inner cylinders. This utility model, through the setting of the limiting component and the connecting component, can achieve a more stable clamping effect on the screwdriver bit. Compared with the prior art, the installation and fixing effect of the screwdriver bit is better. The guide and stabilizing bearing ensures the concentricity of the screwdriver bit's rotation during use, preventing wobbling.

Description

Technical Field

[0001] This utility model relates to the field of screwdriver technology, specifically to an electric screwdriver. Background Technology

[0002] Electric screwdrivers, as efficient fastening tools, are widely used in mechanical assembly, electronic equipment repair, and home installation. Their core function is to quickly install and remove bolts and screws by driving the screwdriver bit to rotate.

[0003] In practical use, the requirements for bit extension length vary significantly depending on the operating scenario. For example, when operating in narrow spaces or deep holes, the bit needs to extend a long distance to contact the target. However, in precision equipment or shallow hole operations, an excessively long bit may lead to loss of control or damage to the workpiece surface. Therefore, flexible adjustment of bit length is one of the key performance characteristics that improves the applicability of electric screwdrivers.

[0004] Currently, the common electric screwdriver bit length adjustment methods on the market mainly fall into two categories: one is a fixed length design, that is, the bit is fixedly connected to the screwdriver body and the length cannot be adjusted. The only way to meet the needs is to replace the bit with a different length, which is cumbersome and requires multiple sets of bits.

[0005] Secondly, there is the internal structure adjustment, such as adjusting the bit length through the telescopic sleeve or spring clip structure built into the blade body. However, such designs usually require disassembling part of the outer shell or completing the adjustment through complex mechanical linkage, which has problems such as inconvenient operation and low structural reliability.

[0006] Therefore, an electric screwdriver is needed to improve the above problems. Utility Model Content

[0007] The purpose of this utility model is to provide an electric screwdriver to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] An electric screwdriver includes a motor and a screwdriver bit. A limiting component is provided at the end of the motor, and the output end of the motor passes through the limiting component. The output end of the motor and the screwdriver bit are connected via a connecting assembly. A protective cylinder is connected to the end of the limiting component. The protective cylinder includes an outer cylinder and an inner cylinder that are screwed together. A locking component is provided on the outer side of the inner cylinder to limit the position between the outer and inner cylinders. The inner side of the outer cylinder has an internal thread, and the outer side of the inner cylinder has an external thread. The locking component is a locking nut that screws together with the external thread on the outer side of the inner cylinder. The limiting component includes a mating end that connects to the end of the motor. The lower end of the mating end is fixedly connected to the limiting cylinder, which is hollow and contains several bearings.

[0010] As a preferred embodiment of this utility model, a mounting groove is provided at the top of the docking end, and a gear limiting assembly is provided in the mounting groove.

[0011] As a preferred embodiment of this utility model, the gear limiting group includes a main gear, which is fixedly connected to the output end of the motor, and a plurality of limiting gears mesh on the outer side of the main gear.

[0012] As a preferred embodiment of this utility model, the connecting assembly includes a docking cylinder and a locking member that is inserted into the docking cylinder. The locking member is used to clamp the end of the bit. A connecting cylinder is provided on the outside of the locking member. The lower end of the docking cylinder is screwed into the connecting cylinder so that the end of the locking member extends into the interior of the docking cylinder.

[0013] The lower end of the connecting cylinder is provided with a protruding ring, and the lower end of the locking member is provided with an annular groove that cooperates with the protruding ring for limited rotation.

[0014] As a preferred embodiment of this utility model, a docking sleeve is fixedly connected to the upper end of the outer cylinder, and the docking sleeve is bonded and fixedly connected to the docking end.

[0015] As a preferred embodiment of this utility model, a locking sleeve is provided at the lower end of the inner cylinder, and a spring is provided between the locking sleeve and the end of the limiting member. The spring is sleeved on the outside of the connecting assembly, and an air pipe connector communicating with the inside of the locking sleeve is provided on the side of the locking sleeve. The locking sleeve is sleeved on the outside of the bit, and the locking sleeve moves and adjusts along the length direction of the bit with the inner cylinder, thereby adjusting the length of the bit.

[0016] As a preferred embodiment of this utility model, the upper end of the docking end is provided with a plurality of connecting holes, and a plurality of screws are provided in the connecting holes for connecting the motor.

[0017] As a preferred embodiment of this utility model, the upper end of the docking cylinder is provided with a docking hole that is inserted into the motor output end, and the cross-section of the docking hole is polygonal.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] The present invention achieves a more stable clamping effect on the bit by setting the limiting component and the connecting component. Compared with the prior art, the bit installation and fixing effect is better. The guide stabilizing bearing ensures the concentricity of the bit rotation during use and avoids shaking.

[0020] This invention features a screw-connected structure between the outer and inner cylinders. Users only need to rotate the inner cylinder to drive the locking sleeve to move along the length of the bit, thus flexibly adjusting the bit's extension length. Compared to traditional internal adjustments that require disassembling the outer shell or complex mechanical linkages, this design requires no additional tools or disassembly steps, making operation simpler and more efficient. Attached Figure Description

[0021] Figure 1 This is a first-view perspective perspective view of the present invention;

[0022] Figure 2 This is a second-view perspective perspective view of the present invention;

[0023] Figure 3 This is a first-view schematic diagram of the internal structure of this utility model;

[0024] Figure 4 This is a second-view schematic diagram of the internal structure of this utility model.

[0025] In the diagram: 1. Motor; 2. Power cord; 3. Connecting end; 4. Connecting sleeve; 5. Outer cylinder; 6. Inner cylinder; 7. Locking nut; 8. Air pipe connector; 9. Locking sleeve; 10. Fixing screw hole; 11. Connecting cylinder; 12. Locking part; 13. Screwdriver bit; 14. Convex ring; 15. Connecting cylinder; 16. Spring; 17. Limiting cylinder; 18. Main gear; 19. Limiting gear; 20. Bearing. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0027] To facilitate understanding of this utility model, a more comprehensive description of it will be provided below with reference to relevant embodiments. Several embodiments of this utility model are given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0028] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Please see Figure 1-4 This utility model provides a technical solution:

[0031] For an example, please refer to... Figure 1 , 2 3 and 4, an electric screwdriver, including a motor 1 and a bit 13. The end of the motor 1 is provided with a limiting member. The output end of the motor 1 passes through the limiting member. The output end of the motor 1 and the bit 13 are connected by a connecting component. The end of the limiting member is connected to a protective cylinder. The protective cylinder includes an outer cylinder 5 and an inner cylinder 6 that are screwed together. A locking member is provided on the outside of the inner cylinder 6 to limit the position between the outer cylinder 5 and the inner cylinder 6. A locking sleeve 9 is provided at the lower end of the inner cylinder 6. A spring 16 is provided between the locking sleeve 9 and the end of the limiting member. The spring 16 is sleeved on the outside of the connecting component. An air pipe connector 8 communicating with the inside of the locking sleeve 9 is provided on the side of the locking sleeve 9. The locking sleeve 9 is sleeved on the outside of the bit 13. The locking sleeve 9 moves and adjusts along the length direction of the bit 13 with the inner cylinder 6, thereby adjusting the length of the bit 13.

[0032] The whole unit consists of motor 1, connecting component, bit 13 and protective cylinder. Motor 1 is powered by power line 2. Its output end passes through the limiting component and connects with the connecting component, and finally drives bit 13 to rotate to complete screw loading and unloading.

[0033] Please refer to Figure 1 , 2 3 and 4, the inner side of the outer cylinder 5 is provided with internal threads, the outer side of the inner cylinder 6 is provided with external threads, the locking part is a locking nut 7 that is screwed into the outer external thread of the inner cylinder 6, and the upper end of the outer cylinder 5 is fixedly connected to the mating sleeve 4, and the mating sleeve 4 is bonded and fixedly connected to the mating end 3.

[0034] The length adjustment of the bit 13 is achieved through the screw-on structure of the protective cylinder. The inner side of the outer cylinder 5 is provided with internal threads, and the outer side of the inner cylinder 6 is provided with external threads. The two are screwed together by threaded engagement. The upper end of the outer cylinder 5 is fixed with the docking sleeve 4, which is glued and fixed to the docking end 3. Therefore, the position of the outer cylinder 5 is fixed. The lower end of the inner cylinder 6 is connected to the locking sleeve 9, which is fitted on the outside of the bit 13. The side of the locking sleeve 9 is provided with an air pipe connector 8. During adjustment, the user rotates the inner cylinder 6. Because the outer cylinder 5 is fixed, the inner cylinder 6 moves axially through the threaded engagement, which drives the locking sleeve 9 to move along the length direction of the bit 13. When the locking sleeve 9 moves, it changes the extension length of the bit 13. After the adjustment is completed, the relative position of the inner cylinder 6 and the outer cylinder 5 is fixed by tightening the locking nut 7 on the outside of the inner cylinder 6, so as to prevent the length of the bit 13 from changing due to vibration during operation.

[0035] The air pipe connector 8 is connected to an external air pipe and a negative pressure machine. This generates suction at the end of the locking sleeve 9 to pull the screw in.

[0036] Please refer to Figure 1 , 2 3 and 4, the limiting component includes a mating end 3 that mates with the end of the motor 1. The upper end of the mating end 3 has several connecting holes, and several screws are provided in the connecting holes for connecting the motor 1. The top of the mating end 3 has a mounting groove, and a gear limiting assembly is provided in the mounting groove. The lower end of the mating end 3 is fixedly connected to a limiting cylinder 17. The limiting cylinder 17 is hollow inside and is provided with several bearings 20. The gear limiting assembly includes a main gear 18, which is fixedly connected to the output end of the motor 1, and several limiting gears 19 mesh with the outer side of the main gear 18.

[0037] The limiting component includes a docking end 3 and a limiting cylinder 17. The docking end 3 is fixed to the end of the motor 1 by a screw in the upper connecting hole. A gear limiting group is set in the mounting groove at its top, including a main gear 18 and several limiting gears 19. The main gear 18 is fixedly connected to the output end of the motor 1, and the outer side meshes with multiple limiting gears 19. When the output end of the motor 1 rotates, the main gear 18 drives the limiting gears 19 to rotate synchronously. The transmission load is distributed through the meshing of multiple gears, which avoids excessive force on a single gear, resulting in jamming or wear, and improves the transmission stability.

[0038] The limiting cylinder 17, which is fixedly connected to the lower end of the docking end 3, is hollow inside and contains several bearings 20. The output end of the motor 1 is set through the bearings 20. The bearings 20 can reduce the frictional resistance when the output end rotates, further ensuring the smoothness of power transmission and ensuring the concentricity of rotation.

[0039] The connecting assembly includes a docking cylinder 11 and a locking member 12 that engages with the docking cylinder 11. The locking member 12 is used to clamp the end of the bit 13. A connecting cylinder 15 is provided on the outside of the locking member 12. The lower end of the docking cylinder 11 is screwed into the connecting cylinder 15 so that the end of the locking member 12 extends into the interior of the docking cylinder 11. A protruding ring 14 is provided at the lower end of the interior of the connecting cylinder 15. A ring groove is provided at the lower end of the locking member 12 that engages with the protruding ring 14 for limited rotation. The upper end of the docking cylinder 11 has a docking hole that engages with the output end of the motor 1. The cross-section of the docking hole is polygonal.

[0040] The connecting assembly consists of a docking cylinder 11 and a locking member 12. The upper end of the docking cylinder 11 has a polygonal docking hole for insertion into the output end of the motor 1, ensuring no relative sliding between the two and realizing direct power transmission. The lower end of the locking member 12 is used to clamp the end of the bit 13. A connecting cylinder 15 is sleeved on its outer side. The connecting cylinder 15 is screwed into the outer side of the docking cylinder 11 to limit and fix the locking member 12. The lower end of the connecting cylinder 15 is provided with a protruding ring 14, which cooperates with the annular groove at the lower end of the locking member 12 to prevent the bit 13 from falling off, thus achieving an effective and stable clamping effect on the bit 13.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electric screwdriver comprising an electric motor (1) and a bit (13), characterized in that: The motor (1) is provided with a limiting component at its end. The output end of the motor (1) passes through the limiting component. The output end of the motor (1) and the bit (13) are connected by a connecting component. The end of the limiting component is connected to a protective cylinder. The protective cylinder includes an outer cylinder (5) and an inner cylinder (6) that are screwed together. A locking component is provided on the outside of the inner cylinder (6) to limit the position between the outer cylinder (5) and the inner cylinder (6). The inner side of the outer cylinder (5) is provided with an internal thread, and the outer side of the inner cylinder (6) is provided with an external thread. The locking component is a locking nut (7) that is screwed together with the external thread on the outside of the inner cylinder (6). The limiting component includes a docking end (3) that is connected to the end of the motor (1). The lower end of the docking end (3) is fixedly connected to a limiting cylinder (17). The limiting cylinder (17) is hollow inside and is provided with several bearings (20).

2. The electric screwdriver according to claim 1, characterized in that: The top of the docking end (3) is provided with an installation groove, and a gear limit group is provided in the installation groove.

3. The power screwdriver according to claim 2, characterized in that: The gear limiting group includes a main gear (18), which is fixedly connected to the output end of the motor (1), and a number of limiting gears (19) mesh on the outer side of the main gear (18).

4. The electric screwdriver according to any one of claims 1-3, characterized in that: The connecting assembly includes a docking cylinder (11) and a locking member (12) that is inserted into the docking cylinder (11). The locking member (12) is used to clamp the end of the bit (13). A connecting cylinder (15) is provided on the outside of the locking member (12). The lower end of the docking cylinder (11) is screwed into the connecting cylinder (15) so that the end of the locking member (12) extends into the docking cylinder (11). The lower end of the inner cavity of the connecting cylinder (15) is provided with a protruding ring (14), and the lower end of the locking member (12) is provided with an annular groove that cooperates with the protruding ring (14) for limited rotation.

5. The power screwdriver according to claim 4, characterized by: The upper end of the outer cylinder (5) is fixedly connected to the docking sleeve (4), and the docking sleeve (4) is bonded and fixedly connected to the docking end (3).

6. The power screwdriver according to claim 4, characterized by: The lower end of the inner cylinder (6) is provided with a locking sleeve (9), and a spring (16) is provided between the locking sleeve (9) and the end of the limiting member. The spring (16) is sleeved on the outside of the connecting assembly. The side of the locking sleeve (9) is provided with an air pipe connector (8) communicating with its interior. The locking sleeve (9) is sleeved on the outside of the bit (13). The locking sleeve (9) moves and adjusts along the length direction of the bit (13) with the inner cylinder (6), thereby adjusting the length of the bit (13).

7. The electric screwdriver according to claim 4, characterized by: The upper end of the docking end (3) is provided with several connecting holes, and several screws are provided in the connecting holes for connecting the motor (1).

8. The power screwdriver according to claim 7, characterized by: The upper end of the docking cylinder (11) is provided with a docking hole that is connected to the output end of the motor (1). The cross-section of the docking hole is polygonal.

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