screwdriver

Abstract

This utility model discloses a screwdriver, belonging to the category of hand tools. Existing multi-functional screwdrivers are inconvenient for retrieving the bit holder from the receiving cavity of the handle. The screwdriver of this utility model includes a handle and a screwdriver bar extending forward from the front end of the handle. The handle has a receiving cavity with a port located at the rear end of the handle. A removable bit holder is placed in the receiving cavity, and spare bits are stored on the bit holder. A tail cap is connected to the port, and the tail cap constrains the bit holder in the receiving cavity. A first elastic element is disposed within the receiving cavity. When the bit holder is placed in the receiving cavity, the first elastic element applies a spring force to the bit holder. When the bit holder is removed from the receiving cavity, the spring force of the first elastic element pushes the bit holder outward from the receiving cavity, increasing the ease of removal. Moreover, when the bit holder is placed in the receiving cavity, the spring force applied by the first elastic element stabilizes the bit holder in the receiving cavity, preventing the bit holder from shaking.

Description

Technical Field

[0001] This utility model belongs to the field of hand tool technology, specifically relating to a screwdriver. This screwdriver has a bit holder inside the handle, which stores spare bits for use as needed. Background Technology

[0002] A screwdriver is a tool specifically designed for turning screws and securing them in place. It is typically equipped with a bit that fits into the slot or recess of the screw head.

[0003] Common screwdrivers feature an integrated head and shank design, meaning each screwdriver has a single, non-replaceable bit for easy access. However, due to the wide variety of screw sizes and the diverse groove or notch shapes on screw heads, multiple screwdrivers of different sizes are often needed to accommodate various groove or notch shapes. This is not only cumbersome to use but also more expensive and takes up more space.

[0004] To address this challenge, multi-functional screwdrivers have emerged on the market, capable of handling a wide range of screw sizes, thus reducing the number of tools required. These screwdrivers typically come with replaceable bits, with a bit holder stored in a cavity within the shank. Spare bits are stored in the bit holder, allowing users to change bits of different sizes and shapes to accommodate different types of screws. However, retrieving spare bits requires removing the bit holder from the cavity, a configuration that is inconvenient. Furthermore, the existing bit holders are unrestrained within the cavity and prone to wobbling during use. Utility Model Content

[0005] This invention addresses the drawback of existing multi-functional screwdrivers where it is inconvenient to retrieve the bit holder from the holder's cavity. It provides a screwdriver that uses elasticity to push the bit holder out of the cavity when it is removed, increasing convenience and stabilizing the bit holder within the cavity by the elasticity, thus preventing the bit holder from shaking.

[0006] To achieve the above objectives, the screwdriver of this utility model includes a handle and a screwdriver bar extending forward from the front end of the handle. The handle has a receiving cavity with a port located at the rear end of the handle. A removable bit holder is placed inside the receiving cavity, and spare bits are stored on the bit holder. A tail cap is connected to the port, and the tail cap constrains the bit holder within the receiving cavity. The screwdriver is characterized by: a first elastic element disposed within the receiving cavity; when the bit holder is placed in the receiving cavity, the first elastic element applies a spring force to the bit holder; when the bit holder is removed from the receiving cavity, the spring force of the first elastic element pushes the bit holder outward from the receiving cavity, increasing the ease of removal. Furthermore, when the bit holder is placed in the receiving cavity, the spring force applied by the first elastic element stabilizes the bit holder within the receiving cavity, preventing the bit holder from shaking.

[0007] Preferably, the first elastic element is a helical compression spring located at the front end of the bit holder. Such a spring has a large deformation capacity and can apply elastic force to the bit holder throughout its entire stroke as it moves out of the receiving cavity.

[0008] Preferably, the outer diameter of the helical compression spring gradually decreases from one end to the other. When the bit holder is placed in the receiving cavity, the helical compression spring is compressed, and the spiral spring wires are interlocked rather than stacked, which reduces the length after compression and prevents the front-to-back length of the handle from increasing.

[0009] Preferably, the receiving cavity is provided with a guide rod, and the bit holder is provided with a guide hole. When the bit holder is placed in the receiving cavity, the guide rod is located in the guide hole. This facilitates the removal of the bit holder from the receiving cavity and the placement of the bit holder into the receiving cavity.

[0010] Preferably, the rear end of the guide rod is connected to a blocking member, and the front end of the guide hole is provided with a blocking edge. When the bit holder is removed from the receiving cavity, the blocking edge is blocked by the blocking member to prevent the bit holder from detaching from the handle. Accordingly, the bit holder can be prevented from detaching from the handle and being lost.

[0011] Preferably, the front end of the guide hole is defined as a flat hole by a blocking edge, and the guide rod is a flat rod. The flat rod and the flat hole cooperate to prevent the bit holder from rotating relative to the guide rod. This helps to keep the entire bit holder stable in the receiving cavity and prevent it from shaking.

[0012] In different embodiments, the tail cap and bit holder are configured separately, or the tail cap and bit holder are configured as an integral part.

[0013] Preferably, the inner wall of the port is provided with a slot, and the tail cover includes a radially retractable locking tongue. The locking tongue is inserted into the slot by the elastic force of a second elastic element to connect the tail cover to the port. The tail cover includes a button that is linked to the locking tongue. Pressing the button causes the locking tongue to disengage from the slot. Accordingly, the tail cover can be reliably connected to the handle, and the tail cover can be easily removed.

[0014] Preferably, the slots and latches comprise at least two pairs evenly distributed along the circumference. This increases the reliability of the tail cap connection.

[0015] Preferably, the button and the latch are engaged by a bevel. This increases the sensitivity of the button and latch linkage.

[0016] Preferably, the button has a third elastic element. When the button is pressed, the elastic force of the third elastic element is overcome; when the button is released, the elastic force of the third elastic element causes the button to reset. This provides space for the latch to reset.

[0017] Preferably, for ease of assembly, the tail cover includes a base and a cover body assembled together. The base has a guide groove, and the locking tongue and a second elastic element are disposed in the guide groove. The cover body has a through hole, and the button is located between the base and the cover body and protrudes from the cover body through the through hole. Moreover, the button protruding from the cover body through the through hole facilitates operation.

[0018] Preferably, the bit holder includes a base frame and a rotating frame. Storage positions are distributed along the circumference of the rotating frame, and spare bits are stored in the storage positions. The storage positions have radial openings, and the rotating frame is fitted onto the base frame and can rotate relative to the base frame. Rotating the rotating frame facilitates the retrieval and selection of the required bits.

[0019] Preferably, the opening is oriented off-center from the line connecting the center of the storage compartment and the center of the bit rack. This allows for a greater number of storage compartments to be distributed circumferentially within a defined diameter.

[0020] Preferably, the storage compartment is formed between adjacent radial wings, the opening of the storage compartment is defined by two opposing narrow folded boundaries, and the cross-sectional profile of the storage compartment defines a hexagonal profile for storing the bit.

[0021] This invention utilizes a first elastic element within the receiving cavity. When the bit holder is placed in the cavity, the first elastic element exerts a spring force on it. When the bit holder is removed from the cavity, this spring force pushes the bit holder outward, increasing the ease of removal. Furthermore, the spring force applied by the first elastic element when the bit holder is in the cavity stabilizes it, preventing it from wobbling. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the screwdriver of this utility model from one perspective of orthographic projection.

[0023] Figure 2 for Figure 1 The right view;

[0024] Figure 3 for Figure 2 Sectional view along axis AA;

[0025] Figure 4 for Figure 3 Enlarged cross-sectional view of BB direction;

[0026] Figure 5 for Figure 3 Enlarged cross-sectional view along the CC direction;

[0027] Figure 6 This is an exploded view of the screwdriver of this utility model.

[0028] Figure 7 for Figure 6 A schematic diagram of the structure shown from another perspective;

[0029] Figure 8 This is an exploded view of the screwdriver bit holder of this utility model;

[0030] Figure 9 for Figure 8 A schematic diagram of the structure shown from another perspective;

[0031] Figure 10 for Figure 3 Enlarged diagram of the tailgate;

[0032] Figure 11 This is a schematic diagram showing the storage positions distributed on the rotating frame of this utility model;

[0033] Explanation of the labels in the diagram:

[0034] 100 Handle, 101 Receiving cavity, 102 Guide rod, 103 Blocking element, 104 Slot, 105 First elastic element, 106 First pawl, 107 Second pawl, 108 Rotating sleeve, 109 Actuating part, 110 Positioning tumbler.

[0035] 200 screwdriver bar, 201 toothed groove, 202 blind hole, 203 magnet;

[0036] 300 Bit holder, 301 Guide hole, 302 Blocking edge, 303 Rotating frame, 304 Storage position, 305 Opening, 306 Orientation of the opening, 307 Direction of the line connecting the center of the storage position and the center of the bit holder, 308 Radial side wing, 309 Narrow folded edge, 310 Front wall, 311 First sleeve, 312 Rear wall, 313 Second sleeve;

[0037] 400 heads;

[0038] 500 Tail cap, 501 Locking tongue, 502 Second elastic element, 503 Button, 504 Bevel, 505 Third elastic element, 506 Base, 507 Cover body, 508 Guide groove, 509 Through hole, 510 First flange, 511 Second flange. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this utility model are intended to cover non-exclusive inclusion, such as a method or product that includes a series of technical features, not limited to those technical features explicitly listed, but also including other technical features that may be included in the method or product but not explicitly listed.

[0041] In the description of this utility model, it should be understood that the technical features defined by terms such as "first," "second," and "third," which have a sequential concept, are only used to clearly describe the defined technical features and to clearly distinguish the defined technical features from other technical features, and do not represent that they are named in this way in actual implementation. Therefore, they should not be construed as limitations on this utility model.

[0042] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings.

[0043] As shown in 1-3 and 6-7, the screwdriver includes a shank 100 and a front end of the shank ( Figure 1-3 The screwdriver handle extends forward from its upper end, and has a receiving cavity 101 inside the handle. The receiving cavity has a port located at the rear end of the handle. A removable bit holder 300 is placed inside the receiving cavity, and spare bits 400 are stored on the bit holder. A tail cap 500 is connected to the port, and the tail cap 500 constrains the bit holder within the receiving cavity. A first elastic element 105 is disposed within the receiving cavity. When the bit holder is placed in the receiving cavity, the first elastic element applies a spring force to the bit holder. When the bit holder is removed from the receiving cavity, the spring force of the first elastic element pushes the bit holder outward from the receiving cavity, increasing the ease of removal. Furthermore, when the bit holder is placed in the receiving cavity, the spring force applied by the first elastic element stabilizes the bit holder within the receiving cavity, preventing the bit holder from shaking.

[0044] In the illustrated structure, the first elastic element 105 is a helical compression spring located at the front end of the bit holder. Such a spring has a large deformation capacity and can apply elastic force to the bit holder throughout its entire stroke as it moves out of the receiving cavity.

[0045] In the illustrated structure, the outer diameter of the helical compression spring gradually decreases from one end to the other. When the bit holder is placed in the receiving cavity, the helical compression spring is compressed. The spiral spring wires are interlocked rather than stacked, which reduces the length after compression and prevents the front-to-back length of the handle from increasing.

[0046] In the illustrated structure, a guide rod 102 is provided inside the receiving cavity, and the guide rod is fixedly assembled to the front wall of the receiving cavity by fasteners. The bit holder 300 is provided with a guide hole 301, and when the bit holder is placed in the receiving cavity, the guide rod 102 is located in the guide hole 301. This facilitates the removal of the bit holder from the receiving cavity and the placement of the bit holder into the receiving cavity.

[0047] In the illustrated structure, the rear end of the guide rod 102 is connected to the blocking member 103, and the front end of the guide hole 301 is provided with a blocking edge 302. When the bit holder is removed from the receiving cavity, the blocking edge 302 is blocked by the blocking member 103 to prevent the bit holder from detaching from the handle. This prevents the bit holder from detaching from the handle and falling or being lost. Furthermore, during assembly, the bit holder is first inserted into the receiving cavity and placed on the guide rod, and then the blocking member is installed at the rear end of the guide rod.

[0048] In the illustrated structure, the front end of the guide hole 301 is defined as a flat hole by the blocking edge 302, and the guide rod 102 is a flat rod. The flat rod and the flat hole cooperate to prevent the bit holder from rotating relative to the guide rod. This helps to keep the entire bit holder stable in the receiving cavity and prevent it from shaking.

[0049] In the illustrated structure, the tail cap 500 and the bit holder 300 are integrally configured, as shown by the base 506 described below being integrally connected to the rear end wall. Therefore, the bit holder can be removed from the receiving cavity when the tail cap is removed. In other embodiments, the tail cap and bit holder can be configured separately, such as... Figure 10 As shown, the tail cap 500 is defined by a double-dotted square, dividing the part where the tail cap and bit holder are integrally connected into two parts, that is, the tail cap and bit holder are configured separately.

[0050] In the illustrated structure, the inner wall of the port is provided with a slot 104. The tail cover 500 includes a radially retractable latch 501. The latch 601 is inserted into the slot 104 by the elastic force of the second elastic element 502 to connect the tail cover to the port. The tail cover 500 includes a button 503 that is linked to the latch 501. Pressing the button causes the latch to disengage from the slot. Accordingly, the tail cover can be reliably connected to the handle, and the tail cover can be easily removed.

[0051] In the illustrated structure, the slot 104 and the latch 501 include at least two pairs evenly distributed along the circumference. This increases the reliability of the tail cap connection.

[0052] In the illustrated structure, button 503 and latch 501 are engaged by inclined surface 504. This increases the sensitivity of the button and latch linkage.

[0053] In the illustrated structure, a third elastic element 505 acts on button 503. When the button is pressed, it overcomes the elastic force of the third elastic element; when the button is released, the elastic force of the third elastic element causes the button to reset, providing space for the latch to reset.

[0054] In the illustrated structure, for ease of assembly, the tail cover 500 includes a base 506 and a cover 507 assembled together. Specifically, the base 506 and the cover 507 are respectively provided with an arc-shaped first flange 510 and a second flange 511, which press the base and cover together, with the first and second flanges passing over each other, thus locking the base and cover together. The base has a radial guide groove 508, and a locking tongue 501 and a second elastic element 502 are disposed in the guide groove 508. The cover 507 has a through hole 509, and a button 503 is located between the base and the cover, protruding from the cover through the through hole 509. Furthermore, the button protruding from the cover through the through hole facilitates operation.

[0055] In the illustrated structure, the bit holder 300 includes a base frame and a rotating frame 303. The base frame is formed by connecting a first sleeve 311 with a front end wall 310 and a second sleeve 313 with a rear end wall 312. The rotating frame 303 is an integral structure that fits over the second sleeve 313 and is limited in axial movement by a step. Storage positions 304 are distributed circumferentially on the rotating frame 303, where spare bits are stored. Each storage position has a radially facing opening 305. The rotating frame 303, fitted onto the base frame, can rotate relative to the base frame. Rotating the rotating frame facilitates the retrieval and selection of the required bits.

[0056] like Figure 11 As shown, the orientation of the opening 306 deviates from the direction 307 of the line connecting the center of the storage location and the center of the bit rack. This is in Figure 11 This is manifested in the fact that the orientation of the opening maintains an angle α with the direction of the connecting line. This allows for the distribution of more storage spaces along the circumference within a defined diameter.

[0057] In the illustrated structure, storage compartment 304 is formed between adjacent radial wings 308, and the opening 305 of the storage compartment is defined by two opposing narrow flanges 309. The cross-sectional profile of the storage compartment defines a hexagonal profile 314 for storing bit tools.

[0058] In addition, such as Figure 3-5 As shown, the screwdriver bar 200 is rotatably mounted on the handle 100, and a transmission mechanism is disposed between the screwdriver bar and the handle. This transmission mechanism includes a toothed groove 201 on the circumferential surface of the screwdriver bar 200, a pair of first pawls 106 and a pair of second pawls 107 disposed on the handle, and a rotating sleeve 108 mounted on the handle. The first pawls and / or the second pawls engage with the toothed groove 201 via the elastic force of their rear elastic elements to achieve unidirectional or bidirectional torque transmission. Figure 4 The scenario shown is that the rotating sleeve 108 is in the neutral position, with both pairs of pawls engaged with the tooth grooves. At this point, regardless of whether the handle is turned clockwise or counterclockwise, the torque can be transferred to the wrench bar via the pawls. Figure 4When the rotating sleeve 108 is rotated clockwise as shown, the first pawl 106 is pushed away from the tooth groove by the actuating part 109 of the rotating sleeve, and only the second pawl 107 engages with the tooth groove. At this time, rotating the handle clockwise transfers torque to the screwdriver bar via the second pawl. Rotating the handle counterclockwise causes the second pawl to slip off the tooth groove, preventing torque transfer to the screwdriver bar, thus achieving unidirectional torque transmission in the clockwise direction. Figure 4 When the rotating sleeve 108 is rotated counterclockwise as shown, the second pawl 107 is pushed away from the tooth groove 201 by the actuating part of the rotating sleeve and disengages from the tooth groove. Only the first pawl 106 engages with the tooth groove 201. At this time, rotating the handle counterclockwise can transfer the torque to the wrench bar through the first pawl 106. Rotating the handle clockwise causes the first pawl to slip from the tooth groove, preventing the torque from being transferred to the wrench bar. This achieves unidirectional torque transmission in the counterclockwise direction. When transmitting torque in one direction, the handle can be loosened and the handle can be rotated repeatedly to quickly apply torque.

[0059] like Figure 5 As shown, when the rotating sleeve 108 rotates to any position, it is positioned by the positioning ball 110.

[0060] In other embodiments, the drive mechanism between the lever 200 and the handle 100 can be replaced by a different structural form. Alternatively, the lever and handle can be fixedly assembled.

[0061] like Figure 3 As shown, the front end of the screwdriver shank 200 has a blind hole 202, and a magnet 203 is installed in the blind hole. The screwdriver bit can be installed into the blind hole as needed to tighten screws.

[0062] Furthermore, the bit holder is made of high-strength materials to ensure wear resistance during long-term use. The handle surface is treated with anti-scratch and anti-corrosion coatings, extending the product's lifespan.

Claims

1. A screwdriver, comprising a shank (100), a shank (200) extending forward from the front end of the shank, a receiving cavity (101) provided within the shank, the receiving cavity having a port located at the rear end of the shank, a removable bit holder (300) placed within the receiving cavity, a spare bit (400) stored on the bit holder, and a tail cap (500) connected to the port, the tail cap (500) constraining the bit holder within the receiving cavity, characterized in that: A first elastic element (105) is disposed in the receiving cavity (101). When the bit holder is placed in the receiving cavity, the first elastic element (105) is applied to the first elastic element to exert a spring force on the bit holder (300). When the bit holder is removed from the receiving cavity, the spring force of the first elastic element (105) pushes the bit holder (300) out of the receiving cavity.

2. The screwdriver according to claim 1, characterized in that: The first elastic element (105) is a helical compression spring located at the front end of the bit holder.

3. The screwdriver according to claim 2, characterized in that: The outer diameter of a helical compression spring gradually decreases from one end to the other.

4. The screwdriver according to any one of claims 1-3, characterized in that: The receiving cavity (101) is provided with a guide rod (102), and the bit holder (300) is provided with a guide hole (301). When the bit holder is placed in the receiving cavity, the guide rod (102) is located in the guide hole (301).

5. The screwdriver according to claim 4, characterized in that: The guide rod (102) is connected to the blocking member (103) at the rear end. The guide hole (301) is provided with a blocking edge (302) at the front end. When the bit holder is removed from the receiving cavity, the blocking edge (302) is blocked by the blocking member (103) to prevent the bit holder from detaching from the handle.

6. The screwdriver according to claim 4, characterized in that: The front end of the guide hole (301) is limited to a flat hole by the blocking edge, and the guide rod (102) is a flat rod. The flat rod and the flat hole cooperate to prevent the bit holder from rotating relative to the guide rod.

7. The screwdriver according to claim 1, characterized in that: The tail cap and bit holder are separate components.

8. The screwdriver according to claim 1, characterized in that: The tail cap (500) and bit holder (300) are integrated.

9. The screwdriver according to any one of claims 1 and 7-8, characterized in that: The inner wall of the port is provided with a slot (104), and the tail cover (500) includes a radially retractable latch (501). The latch (501) is inserted into the slot (104) by the elastic force of the second elastic element (502) to connect the tail cover to the port. The tail cover (500) includes a button (503) that is linked to the latch (501). Pressing the button (503) causes the latch (501) to exit the slot (104).

10. The screwdriver according to claim 9, characterized in that: The slot (104) and the latch (501) include at least two pairs evenly distributed along the circumference.

11. The screwdriver according to claim 9, characterized in that: The button (503) engages with the latch (501) via the ramp (504).

12. The screwdriver according to claim 9, characterized in that: The button (503) has a third elastic element (505) that overcomes the elastic force of the third elastic element when the button is pressed, and causes the button to reset when the button is released.

13. The screwdriver according to claim 9, characterized in that: The tail cover (500) includes a base (506) and a cover (507) assembled together. The base (506) has a guide groove (508), a locking tongue (501) and a second elastic element (502) are disposed in the guide groove (508), and the cover (507) has a through hole (509). A button (503) is located between the base and the cover and protrudes from the cover through the through hole (509).

14. The screwdriver according to claim 1, characterized in that: The bit holder (300) includes a base frame and a rotating frame (303). Storage positions (304) are distributed along the circumference of the rotating frame (303). Spare bits are stored in the storage positions, which have radial openings (305). The rotating frame (303) is fitted onto the base frame and can rotate relative to the base frame.

15. The screwdriver according to claim 14, characterized in that: The orientation of the opening (306) deviates from the direction of the line connecting the center of the storage location and the center of the bit rack (307).

16. The screwdriver according to any one of claims 1, 14-15, characterized in that: The storage compartment (304) is formed between adjacent radial wings (308), the opening (305) of the storage compartment is defined by two opposing narrow flanges (309), and the cross-sectional profile of the storage compartment defines a hexagonal profile.

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