Explosion-proof ratchet screwdriver

Abstract

The utility model relates to an anti-explosion ratchet screwdriver which comprises a fixed core. The rear portion of the fixed core is fixedly connected with the handle, and the middle and the front portion of the fixed core are rotationally connected with a reversing sleeve and a ratchet wheel core. The fixed core comprises a connecting cylinder, a positioning ring table and a fixed cylinder which are coaxially arranged; a cutting groove is formed in the outer side wall of the connecting cylinder, a first long hole, a second long hole and a shifting fork on the outer side are arranged on the upper portion of the cutting groove, a third long hole is formed in the lower portion of the connecting cylinder and located on the side wall of the opposite side of the cutting groove in the radial direction, and compression springs and top beads at the free ends of the compression springs are arranged in the first long hole, the second long hole and the third long hole respectively. The reversing sleeve comprises a ring sleeve, and the inner side wall of the ring sleeve is provided with a ball ejecting groove corresponding to the third long hole and a reversing shifting piece opposite to the ball ejecting groove. The reversing plectrum abuts against the shifting fork on the outer side of the shifting fork. The ratchet wheel core comprises a bit fixing column and a ratchet wheel sleeve, and ratchets are arranged on the inner wall of the ratchet wheel sleeve. And teeth corresponding to the ratchets are arranged at the two ends of the shifting fork. The explosion-proof device is made of explosion-proof materials, is suitable for explosion-proof places, and is simple and labor-saving to operate.

Description

Technical Field

[0001] This utility model relates to an explosion-proof ratchet screwdriver. Background Technology

[0002] A screwdriver is a common tool used to tighten and loosen screws. Common types of screwdrivers on the market include standard screwdrivers, combination screwdrivers, and electric screwdrivers.

[0003] Electric screwdrivers, which use forward and reverse rotation to install and remove screws, are suitable for confined spaces and one-handed operation, making them increasingly popular among workers. However, in flammable and explosive environments, such as coal mines and chemical manufacturing workshops, the use of electric screwdrivers can easily generate electric sparks, posing a safety hazard. Ordinary screwdrivers are difficult to control in terms of direction when removing screws and are prone to spinning back. Utility Model Content

[0004] The purpose of this invention is to provide an explosion-proof ratchet screwdriver that is simple in structure and easy to operate.

[0005] The present invention adopts the following technical solution:

[0006] An explosion-proof ratchet screwdriver includes a handle and a fixing core fixedly disposed at the front end of the handle; the rear part of the fixing core is fixedly connected to the handle, and the middle and front parts of the fixing core are respectively rotatably connected to a reversing sleeve and a ratchet core; the fixing core and the ratchet core are fixedly connected axially by a pin.

[0007] The fixing core includes a connecting cylinder, a positioning ring platform, and a fixing cylinder arranged coaxially in sequence; the fixing cylinder is fixedly connected to the handle; the outer wall of the connecting cylinder is provided with a groove parallel to the axial direction; the upper part of the connecting cylinder is provided with a first elongated hole and a second elongated hole parallel to each other in the groove; the lower part of the connecting cylinder is provided with a third elongated hole radially on the opposite side wall of the groove; a compression spring is provided in the first elongated hole, the second elongated hole, and the third elongated hole, and a top ball is provided at the free end of each compression spring; a shift fork is provided on the outer side of the first elongated hole and the second elongated hole.

[0008] The reversing sleeve includes a ring sleeve fitted on the outer side of the bottom of the connecting cylinder. The inner side wall of the ring sleeve is provided with a top bead groove corresponding to the third elongated hole. A reversing paddle is provided on the inner side wall of the ring sleeve on the opposite side of the top bead groove. The reversing paddle abuts against the shift fork on the outside of the shift fork.

[0009] The ratchet core includes a bit fixing post and a ratchet sleeve coaxially connected, and the inner wall of the ratchet sleeve is provided with ratchet teeth; the two ends of the shift fork are provided with teeth corresponding to the ratchet teeth.

[0010] Furthermore, a reinforcing block is provided on the outer side of the fixed cylinder.

[0011] Furthermore, the front end of the handle is provided with a positioning ring groove that mates with the positioning ring platform.

[0012] Furthermore, the fork is provided with grooves that are adapted to the top bead, corresponding to the inner sides of the first and second elongated holes.

[0013] Furthermore, there are three top bead grooves, arranged along the same horizontal plane.

[0014] Furthermore, the reversing lever is parallel to the axial direction of the ring sleeve.

[0015] Furthermore, the free end of the bit fixing post is provided with a bit fixing hole with a hexagonal cross section along the axial direction.

[0016] Furthermore, a bit receiving groove is provided inside the rear end of the handle, and a handle back cover is connected to the tail end of the handle by threads.

[0017] Furthermore, the connecting cylinder, positioning ring platform, and fixing cylinder are integrally injection molded.

[0018] Furthermore, the outer side of the handle is provided with anti-slip grooves.

[0019] The advantages of this utility model are as follows: The entire utility model is made of explosion-proof metal, rubber, plastic, and other materials, making it suitable for explosion-proof environments. Reversing is achieved through a ratchet core, a fixing sleeve, and a reversing sleeve, facilitating screw removal, preventing back-rotation, saving time, and improving efficiency. The hollow interior of the handle allows for the placement of screwdriver bits, making it easy to carry. Anti-slip grooves on the outside of the handle prevent slipping during use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the end section of this utility model.

[0022] Figure 3 for Figure 2 A schematic diagram of the AA cross-sectional structure.

[0023] Figure 4 for Figure 2 A schematic diagram of the BB cross-sectional structure.

[0024] Figure 5 This is a schematic diagram of the fixed core structure.

[0025] Figure 6 This is a schematic diagram of the reversing sleeve.

[0026] Figure 7 for Figure 6 A schematic diagram of the left-side view structure.

[0027] Figure 8 This is a schematic diagram of the cross-sectional structure of the ratchet core.

[0028] The components include: 1. Handle; 2. Pin; 3. Connecting cylinder; 4. Positioning ring platform; 5. Fixing cylinder; 6. Groove; 7. First long hole; 8. Second long hole; 9. Third long hole; 10. Compression spring; 11. Top ball; 12. Shift fork; 13. Ring sleeve; 14. Top ball groove; 15. Reversing shifter; 16. Bit fixing post; 17. Ratchet sleeve; 18. Ratchet tooth; 19. Tooth; 20. Reinforcing block; 21. Positioning ring groove; 22. Groove; 23. Bit fixing hole; 24. Bit receiving groove; 25. Handle back cover; 26. Anti-slip groove; 27. Bit. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings.

[0030] like Figure 1 and Figure 2 As shown, an explosion-proof ratchet screwdriver includes a handle 1 and a fixing core fixedly disposed at the front end of the handle 1; the rear part of the fixing core is fixedly connected to the handle 1, and the middle and front parts of the fixing core are respectively rotatably connected to a reversing sleeve and a ratchet core; the fixing core and the ratchet core are fixed at both ends along the axial direction by a pin 2 to achieve relative rotation. The outer side of the handle 1 is provided with an anti-slip groove 26.

[0031] like Figures 3-5 As shown, the fixing core includes a connecting cylinder 3, a positioning ring platform 4, and a fixing cylinder 5 arranged coaxially in sequence, and can be integrally injection molded. The fixing cylinder 5 is fixedly connected to the handle 1; a reinforcing block 20 is provided on the outer side of the fixing cylinder 5, which increases the contact area between the fixing cylinder and the handle, making it more secure.

[0032] The outer wall of the connecting cylinder 3 is provided with a groove 6 parallel to the axial direction. The upper part of the connecting cylinder 3, within the groove 6, has a first elongated hole 7 and a second elongated hole 8 that are parallel to each other. The lower part of the connecting cylinder 3, on the opposite side wall of the groove 6, has a third elongated hole 9 arranged radially. A compression spring 10 is respectively installed within the first elongated hole 7, the second elongated hole 8, and the third elongated hole 9, and a top bead 11 is provided at the free end of each compression spring 10. A shift fork 12 is provided on the outer side of the first elongated hole 7 and the second elongated hole 8. The groove is located on the outer wall of the connecting cylinder, and its specific shape can be adapted to different designs, primarily to provide space for the coordinated action of the reversing paddle and the shift fork. The first and second elongated holes are located on either side of the central hole of the connecting cylinder, cooperating with the shift fork to realize the swinging of the shift fork and the unidirectional rotation of the ratchet core.

[0033] like Figure 6 and Figure 7As shown, the reversing sleeve includes a ring sleeve 13 fitted onto the outer side of the bottom of the connecting cylinder 3. The inner wall of the ring sleeve 13 has three top bead grooves 14 corresponding to the third elongated hole 9, arranged along the same horizontal plane. A reversing paddle 15 is provided on the inner wall of the ring sleeve 13 on the opposite side of the top bead grooves 14; the reversing paddle 15 abuts against the shift fork 12 on the outside of the shift fork 12. The reversing paddle 15 is parallel to the axial direction of the ring sleeve 13. When the ring sleeve rotates, the top bead of the compression spring in the third elongated hole can be positioned in three different top bead grooves, thus positioning the ring sleeve. That is, the ring sleeve has three fixed positions, and correspondingly, the reversing paddle on the ring sleeve also has three fixed positions, controlling the shift fork to be in three states, thereby enabling the ratchet core to turn left, neutral, and right.

[0034] like Figure 8 As shown, the ratchet core includes a bit fixing post 16 and a ratchet sleeve 17 coaxially connected. The inner wall of the ratchet sleeve 17 is provided with ratchet teeth 18. The two ends of the shift fork 12 are provided with teeth 19 corresponding to the ratchet teeth 18.

[0035] Combination Figure 3 As shown, the reversing lever is in the middle, i.e., in neutral, and the ratchet can rotate in both directions. When the ring is turned clockwise, the reversing lever presses upward against the upper part of the shift fork, compressing the spring in the first long hole and extending the spring in the second long hole. The lower part of the shift fork moves towards the ratchet sleeve and engages the ratchet teeth. The ratchet can only rotate counterclockwise at this time, and clockwise rotation is locked. Conversely, when the ring is turned counterclockwise, the reversing lever presses against the lower part of the shift fork, causing the teeth on the upper part of the shift fork to engage with the ratchet teeth. The ratchet can only rotate clockwise.

[0036] The front end of the handle 1 is provided with a positioning ring groove 21 that mates with the positioning ring platform 4, making the structure more compact after installation. The shift fork 12 is provided with grooves 22 that are adapted to the top ball 11 on the inner side of the first elongated hole 7 and the second elongated hole 8, ensuring that the top ball and the shift fork will not shift when they rotate relative to each other.

[0037] The ratchet core, bits, compression spring, top ball, and pin are all made of beryllium copper alloy, suitable for explosion-proof environments. The free end of the bit fixing post 16 has a hexagonal bit fixing hole 23 along its axial direction. The rear end of the handle 1 has a bit receiving groove 24, and a handle back cover 25 is threadedly connected to the tail of the handle 1. The tail end of the bit 27 is a hexagonal shape that fits into the bit fixing hole, facilitating installation and removal. The internal cavity of the handle accommodates multiple bits, eliminating the need for a separate toolbox and allowing for convenient bit changes during use.

[0038] The above-described embodiments are merely preferred embodiments of the present utility model, but are not limited thereto. Those skilled in the art can easily understand the spirit of the present utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of the present utility model, they are all within the protection scope of the present utility model.

Claims

1. An explosion-proof ratchet screwdriver, characterized in that, It includes a handle (1) and a fixing core fixedly disposed at the front end of the handle (1); the rear part of the fixing core is fixedly connected to the handle (1), and the middle and front parts of the fixing core are respectively rotatably connected to a reversing sleeve and a ratchet core; the fixing core and the ratchet core are fixedly connected along the axial direction by a pin (2); The fixing core includes a connecting cylinder (3), a positioning ring platform (4), and a fixing cylinder (5) arranged coaxially in sequence; the fixing cylinder (5) is fixedly connected to the handle (1); the outer wall of the connecting cylinder (3) is provided with a groove (6) parallel to the axial direction; the upper part of the connecting cylinder (3) is provided with a first elongated hole (7) and a second elongated hole (8) parallel to each other in the groove (6); the lower part of the connecting cylinder (3) is provided with a third elongated hole (9) radially on the opposite side wall of the groove (6); a compression spring (10) is provided in the first elongated hole (7), the second elongated hole (8), and the third elongated hole (9), and a top bead (11) is provided at the free end of each compression spring (10); a shift fork (12) is provided on the outer side of the first elongated hole (7) and the second elongated hole (8); The reversing sleeve includes a ring sleeve (13) fitted on the outer side of the bottom of the connecting cylinder (3). The inner side wall of the ring sleeve (13) is provided with a top bead groove (14) corresponding to the third elongated hole (9). A reversing paddle (15) is provided on the inner side wall of the ring sleeve (13) on the opposite side of the top bead groove (14). The reversing paddle (15) abuts against the shift fork (12) on the outside of the shift fork (12). The ratchet core includes a bit fixing post (16) and a ratchet sleeve (17) connected coaxially. The inner wall of the ratchet sleeve (17) is provided with ratchet teeth (18). The two ends of the shift fork (12) are provided with teeth (19) corresponding to the ratchet teeth (18).

2. The explosion-proof ratchet screwdriver according to claim 1, characterized in that, A reinforcing block (20) is provided on the outside of the fixed cylinder (5).

3. The explosion-proof ratchet screwdriver according to claim 1, characterized in that, The front end of the handle (1) is provided with a positioning ring groove (21) that cooperates with the positioning ring platform (4).

4. The explosion-proof ratchet screwdriver according to claim 1, characterized in that, The fork (12) is provided with a groove (22) that is adapted to the top bead (11) on the inner side of the first long hole (7) and the second long hole (8).

5. The explosion-proof ratchet screwdriver according to claim 1, characterized in that, There are three top bead grooves (14), which are arranged along the same horizontal plane.

6. The explosion-proof ratchet screwdriver according to claim 1, characterized in that, The reversing lever (15) is parallel to the axis of the ring sleeve (13).

7. The explosion-proof ratchet screwdriver according to claim 1, characterized in that, The free end of the bit fixing post (16) is provided with a bit fixing hole (23) with a hexagonal cross section along the axial direction.

8. The explosion-proof ratchet screwdriver according to claim 1, characterized in that, The handle (1) has a bit receiving groove (24) inside its rear end, and the handle (1) has a handle back cover (25) connected to its tail end by a thread.

9. The explosion-proof ratchet screwdriver according to claim 1, characterized in that, The connecting cylinder (3), the positioning ring platform (4), and the fixing cylinder (5) are integrally injection molded.

10. The explosion-proof ratchet screwdriver according to claim 1, characterized in that, The handle (1) has an anti-slip groove (26) on its outer side.

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