Firing pin locking structure of nailing gun

Abstract

A striker locking structure of a nail gun. The nail gun comprises an inner shell (1a) and a striker (2) capable of moving relative to the inner shell (1a) and used for nailing. A locking member (3) us

Description

A firing pin locking structure for a nail gun Technical Field

[0001] The invention belongs to the technical field of nail guns and relates to a nail gun, in particular to a firing pin locking structure of the nail gun. Background Art

[0002] Nail guns are a modern fastening technology that fires nails, a technique used in direct fastening. They are essential hand tools for carpentry, construction, and other fields. Currently, pneumatic nail guns are predominantly used. They operate using high-pressure gas generated by an air pump (compressor). When the gas is generated, the firing pin is locked. When the gas is released, the high-pressure gas drives the firing pin in the nail gun's cylinder into a hammering motion, driving the nail in the slot into the object or ejecting the row of nails. Because the high-pressure gas acts on the firing pin, the firing pin is subject to significant friction during unlocking and locking, causing wear and tear during use, which may eventually lead to firing pin lock failure.

[0003] The applicant has proposed a design scheme for the locking structure of the firing pin. The Chinese patent [application number: 201910099968.7] discloses a nail gun, a shell and a firing pin that can move back and forth relative to the shell. The shell is provided with a locking piece and an intermediate piece that can move relative to the shell. The intermediate piece is located between the locking piece and the firing pin. The intermediate piece has a locking part 1 and a locking part 2 that can be clamped on the firing pin; the locking piece can abut against the locking part 1 and block the intermediate piece from moving relative to the shell so that the locking part 2 remains clamped with the firing pin, or the locking piece can release the blockage so that the locking part 2 can move and disengage the firing pin.

[0004] In the above structure, when the hinged rod rotates to the position of the shift block, it can trigger the shift block to drive the locking member to rotate. At this time, the locking member can release the obstruction of the intermediate member, allowing the intermediate member to rotate relative to the housing under the push of the striker and overcome the elastic force of the torsion spring to disengage the striker until the second blocking surface on the locking member contacts and abuts against the stop surface on the intermediate member. In the above structure, the intermediate member is unlocked by rotation. During the unlocking process, it still contacts the groove of the striker for a long time, generating significant friction. At the same time, the contact time between the intermediate member and the locking member is also long, which accelerates the wear of the striker, the intermediate member and the locking member, and reduces the service life of the nail gun. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a firing pin locking structure for a nail gun. The technical problem to be solved by the present invention is: how to increase the service life of the nail gun.

[0006] The objectives of the present invention can be achieved through the following technical solutions: a firing pin locking structure of a nail gun, the nail gun comprising an inner shell and a firing pin that can move relative to the inner shell and is used for nailing, the inner shell is also provided with a locking piece for indirectly or directly locking the firing pin, and it is characterized in that the inner shell is also provided with a driving mechanism and a top shaft that can move along the vertical direction of the inner shell under the drive mechanism, the top shaft is connected to the locking piece, and when the firing pin is unlocked, the top shaft and the locking piece can move along the vertical direction of the inner shell and away from the firing pin.

[0007] In this solution, during the firing pin unlocking process, the top shaft and the locking member can move vertically along the inner housing and away from the firing pin, i.e., the locking member and the top shaft can move upward or downward from the inner housing. This allows the locking member to disengage quickly, reducing contact between the locking member and the firing pin, or between the locking member, the firing pin, and other components, thereby reducing wear on the locking member, the firing pin, or between the locking member, the firing pin, and other components, and thus increasing the service life of the nail gun. This solution provides a technical solution with a different technical concept that can reach the level of the existing technology.

[0008] In the aforementioned firing pin locking structure of a nail gun, the drive mechanism includes a rotary disk disposed within the inner housing, the rotary disk being provided with at least one boss, one end of the top shaft being connected to a locking member, and the other end of the top shaft being provided with a stop block capable of abutting against the boss. After the stop block contacts the boss, the top shaft and the locking member both move vertically upward along the inner housing, at which point the firing pin is unlocked. When the stop block separates from the boss, the firing pin can be relocked or continue to move. During this process, the firing pin does not come into contact with other objects in the locking structure. In this solution, the movement and resetting of the locking member are both controlled by the top shaft, resulting in a simple structure and ensuring smooth locking and unlocking of the firing pin.

[0009] In the aforementioned firing pin locking structure of the nail gun, a return spring is provided on the top shaft for returning the top shaft to its original position. One end of the return spring abuts or is fixed to the top shaft, while the other end of the return spring abuts against the inner housing. The return spring is used to return the top shaft to its original position in the vertical direction.

[0010] In the above-mentioned firing pin locking structure of the nail gun, the locking piece directly locks the firing pin, and a groove is also provided on the firing pin. The locking piece includes a locking portion. When the firing pin is locked, the locking portion is located in the groove and directly locks the firing pin; when the firing pin is unlocked, the locking portion is located above or below the groove.

[0011] In the aforementioned firing pin locking structure of the nail gun, the inner housing is further provided with a fixed block proximate to the locking member. The fixed block and the locking member are located on the same side of the firing pin. The fixed block is further away from the firing pin than the locking member. When the firing pin is locked, the fixed block, the locking member, and portions of the firing pin are on the same horizontal plane. The fixed block prevents the locking member from moving horizontally, thereby improving the locking effect of the locking member on the firing pin.

[0012] In the aforementioned firing pin locking structure for a nail gun, the contact portions of the fixing block and the locking member are both beveled and match each other; or the fixing block or the locking member has a bevel. The fixing block is provided with a bevel, with the upper edge of the bevel being farther from or closer to the locking member than the lower edge. This structure helps prevent the locking member from getting stuck when it moves vertically toward the inner housing, providing a certain degree of guidance for the movement of the locking member.

[0013] In the above-mentioned firing pin locking structure of the nail gun, the locking member indirectly locks the firing pin, the firing pin is provided with a groove, and an intermediate member is provided between the locking member and the firing pin, and the intermediate member respectively has a locking portion 1 and a locking portion 2 that can be clamped on the firing pin, the locking member can abut against the locking portion 1 and prevent the intermediate member from moving relative to the inner shell so that the locking portion 2 remains clamped with the firing pin's groove, the inner shell is rotatably connected to a rotating shaft, the rotating shaft is provided with a torsion spring with one end that can abut against the inner shell, the other end of the torsion spring is fixed to the rotating shaft, and the intermediate member is connected to the rotating shaft. When the firing pin is unlocked, the locking member is located above or below the intermediate member. When the firing pin is unlocked, it drives the intermediate member to rotate. During the firing pin unlocking process, the intermediate member and the locking member no longer contact each other, which reduces the wear of the intermediate member and the locking member and increases the service life of the nail gun.

[0014] In the aforementioned firing pin locking mechanism for a nail gun, a limiting shaft is further connected to the inner housing, and a limiting hole is provided on the locking member that matches the limiting shaft. The limiting shaft is located within the limiting hole. The limiting shaft and the limiting hole work together to prevent the locking member from rotating horizontally. When the firing pin is locked, the locking member abuts against the intermediate member, thereby enhancing the intermediate member's locking effect on the firing pin.

[0015] In the above-mentioned firing pin locking structure of the nail gun, a turntable connected to the motor output shaft is also provided in the inner shell body, a boss is provided on the turntable, the top shaft is fixedly connected to the locking piece, and a reset device is provided on the top shaft, one end of which can rest on the inner shell body, and the other end of the reset device rests on the limit platform of the top shaft. The locking piece is also connected to a rest shaft, and a knockout block is provided at one end of the rest shaft, and the knockout block can rest on the boss.

[0016] In the aforementioned firing pin locking structure for a nail gun, the periphery of the boss and the abutment block is arcuate, the top shaft is provided with a stopper or a fixing hole, and the return spring abuts against the stopper or is fixed in the fixing hole. The arcuate periphery of the boss and the abutment block provides a certain degree of guidance and cushioning for the abutment block and its movement onto the boss, thereby making the movement of the locking member smoother.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. During the firing pin unlocking process, the top shaft and the locking member can move vertically along the inner housing and away from the firing pin, i.e., the locking member and the top shaft move upward from the inner housing. This allows the locking member to disengage quickly, reducing contact between the locking member and the firing pin, or between the locking member, the firing pin, and other components, thereby reducing wear on the locking member, the firing pin, and other components, and extending the service life of the nail gun. This solution provides a technical solution with a different technical concept and can reach the level of the existing technology.

[0019] 2. The periphery of the boss and the abutting block is an arc-shaped structure, which plays a certain guiding and buffering role for the abutting block and the ejecting block to move onto the boss, making the movement of the locking piece smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of the three-dimensional structure of the present invention;

[0021] FIG2 is a schematic cross-sectional view of the present invention;

[0022] FIG3 is a schematic diagram of a partial structure of Example 1 of the present invention;

[0023] FIG4 is a schematic diagram of a portion of the structure of Example 1 of the present invention;

[0024] FIG5 is a schematic diagram of a partial structure of Example 1 of the present invention;

[0025] FIG6 is a schematic diagram of a partial structure of the second embodiment of the present invention;

[0026] FIG7 is a partial structural diagram of the second embodiment of the present invention;

[0027] FIG8 is a schematic cross-sectional view of the structure of the second embodiment of the present invention;

[0028] FIG9 is a schematic diagram of a part of the structure of the second embodiment of the present invention.

[0029] In the figure, 1a, inner housing; 1b, outer housing; 2, striker; 21, groove; 3, locking member; 31, locking portion; 32, lock hook portion; 321, blocking surface 1; 322, blocking surface 2; 33, limiting hole; 4, top shaft; 41, abutting block; 42, limiting platform; 5, turntable; 51, boss; 511, first boss; 512, second boss; 6, intermediate member; 61, locking portion 1; 611, stop surface; 612, abutting surface; 62, locking portion 2; 7. Rotating shaft; 8. Limiting shaft; 9. Fixed block; 10. Return spring; 11. Torsion spring; 12. Blocking plate; 13. Motor; 14. Gear reducer; 15. Crank; 16. Piston rod; 17. First piston; 18. First cylinder; 18a. First air chamber; 19. Second cylinder; 19a. Second air chamber; 20. Second piston; 30. Nail box. Implementation Method

[0030] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments. Example 1

[0031] As shown in Figures 1, 2, 3, and 4, the nail gun includes an inner housing 1a, an outer housing 1b, and a striker 2 that can move relative to the inner housing 1a for nailing. Also disposed within the inner housing 1a are a first cylinder 18 and a second cylinder 19. Within the first cylinder 18 is a first piston 17 capable of performing a compression stroke and a return stroke. The first piston 17 defines a first air chamber 18a within the first cylinder 18 for storing gas. A piston rod 16 is connected to the first piston 17, which is connected to a crank 15. The drive mechanism includes a motor 13, a gear reducer 14, a turntable 5, and the crank 15. The motor 13, disposed within the inner housing 1a, is connected to the gear reducer 14. The output shaft of the gear reducer 14 is connected to the crank 15. The piston rod 16 and the crank 15 form a crank-connecting rod structure, converting the motor's rotational power into power that drives the first moving element to perform linear reciprocating motion. A second piston 20 is located within the second cylinder 19, and the striker 2 is fixedly connected to the second piston 20. The second piston 20 defines a second air chamber 19a within the second cylinder 19. A fully enclosed ventilation passage connects the first and second air chambers 18a, 19a. A motor 13 drives the first piston 17 through a compression stroke and a return stroke. A nail magazine 30 is located at the front end of the inner housing 1a. The nails in the magazine 30 are automatically raised in front of the striker 2 by a spring. After the first piston 17 completes its compression stroke, the striker locking mechanism unlocks, unlocking both the striker 2 and the second piston 20. Under the influence of high pressure, the second piston 20 moves at high speed, driving the striker 2 to strike the nail in front of it, completing a nailing operation. The first piston 17 then performs a return stroke. Under the influence of negative pressure, the second piston 20 is pulled back from its position after the striker has fired a nail to its position where the striker is locked, relocking the striker 2. This reciprocating cycle repeats, achieving continuous nailing.

[0032] The striker 2 is provided with a groove 21. The inner housing 1a is also provided with a blocking plate 12, a top shaft 4, and a locking member 3. The blocking plate 12 and the locking member 3 are both fixed to the top shaft 4, with the blocking plate 12 located above the locking member 3. The locking member 3 is provided with a locking portion 31, and the striker 2 is provided with a locking portion 31 that matches the shape of the groove 21. The locking member 3 is engaged within the groove 21 by the locking portion 31, thereby locking the striker 2. The inner housing 1a is also provided with a fixed block 9 near the locking member 3. The fixed block 9 and the locking member 3 are located on the same side of the striker 2. The fixed block 9 is further away from the striker 2 than the locking member 3. The contact portion of the fixed block 9 and the locking member 3 can be configured as an inclined surface that matches and is further away from the locking member 3 than the bottom. When the locking member 3 and the striker 2 are locked, the fixed block 9, the locking member 3, and part of the striker 2 structure are on the same horizontal plane. The fixed block 9 is used to prevent the locking member 3 from moving horizontally, thereby improving the locking effect of the locking member 3 on the striker 2. The fixing block 9 can also be replaced by a positioning shaft provided on the inner housing 1a and a positioning hole provided on the locking member 3. The positioning shaft is inserted into the positioning hole, and the locking member 3 and parts of the striker 2 are aligned on the same horizontal plane. The positioning shaft prevents the locking member 3 from rotating horizontally, and the positioning hole and positioning shaft configuration save space for the locking structure of the striker 2.

[0033] As shown in Figure 5, the inner housing 1a is also provided with a turntable 5 connected to the crank-connecting rod mechanism, and a boss 51 is provided on the turntable 5. The top shaft 4 is fixedly connected to the locking member 3. The other end of the top shaft 4 is provided with a push-up block 41 that can rest on the boss 51. The periphery of the boss 51 and the push-up block 41 is arc-shaped. The top shaft 4 is provided with a return spring 10 whose one end can rest on the inner housing 1a, and the other end of the return spring 10 rests on the limit platform 42 of the top shaft 4.

[0034] The working principle of this embodiment is as follows: when the striker 2 is locked, the abutting block 41 of the top shaft 4 contacts the turntable 5, and the return spring 10 is in a compressed state. Under the action of the return spring 10, the top shaft 4 and the locking member 3 are subjected to a downward force along the inner housing 1a, so that the locking portion 31 is located in the groove 21 of the striker 2, locking the striker 2; when the striker 2 is unlocked, the abutting block 41 of the top shaft 4 abuts the boss 51, and the top shaft 4 drives the locking member 3 to move upward from the inner housing 1a, so that the locking portion 31 separates from the groove 21 and eventually is above the striker 2. As an alternative solution, when the striker 2 is unlocked, the locking portion 31 separates from the groove 21 and eventually is below the striker 2, and the corresponding driving mechanism is adjusted accordingly. Example 2

[0035] As shown in Figure 6, the structure of this embodiment is roughly the same as that of Example 1. In this embodiment, the locking member 3 is connected to the striker 2, and an intermediate member 6 is provided between the locking member 3 and the striker 2. A rotating shaft 7 is rotatably connected to the inner shell 1a, and the intermediate member 6 is fixed on the rotating shaft 7. A blocking piece 12 is also provided on the rotating shaft 7, and the blocking piece 12 is located above the intermediate member 6. A limiting shaft 8 is also connected to the inner shell 1a, and a limiting hole 33 matching the limiting shaft 8 is provided on the locking member 3, and the limiting shaft 8 is located in the limiting hole 33.

[0036] As shown in FIG7 , the intermediate member 6 includes a first locking portion 61 and a second locking portion 62. The second locking portion 62 can be engaged with the groove 21 of the striker 2. The first locking portion 61 has a stop surface 621 on its inner side and an abutment surface 622 on its outer side. The locking member 3 includes a hook-shaped locking hook portion 32. The inner side of the locking hook portion 32 has a first blocking surface 321 and an outer side of the locking hook portion 32 has a second blocking surface 322. A limit shaft 8 is also connected to the inner housing 1 a. The locking member 3 is provided with a limit hole 33 that matches the limit shaft 8 and is located within the limit hole 33.

[0037] As shown in Figures 8 and 9, in this embodiment, the boss 51 includes a first boss 511 and a second boss 511. A torsion spring 11 is sleeved on the rotating shaft 7, one end of which can rest on the inner housing 1a, and the other end of the torsion spring 11 is fixedly connected to the rotating shaft 7.

[0038] The working principle of this embodiment is that when the striker 2 is locked, the blocking surface 1 321 can abut against the abutting surface 622 and keep the locking part 2 62 fixed in the groove 21 of the striker 2; when the striker 2 needs to be unlocked, the abutting block 41 of the top shaft 4 abuts against the first boss 511, and at this time the top shaft 4 drives the locking member 3 to move vertically upward along the inner shell 1a, and the locking member 3 is located above the middle member 6, and the middle member 6 is in a state of free rotation in the horizontal direction. The striker 2 moves toward the front end of the inner shell 1a driven by the high-pressure gas, and the striker 2 causes the locking part 2 62 to rotate and completely separate from the groove 21. At this time, the rotation The torsion spring 11 of the movable shaft 7 is in a compressed state, and one end of the torsion spring 11 abuts against the inner housing 1a. In order to maintain a gap between the locking portion 2 62 and the striker 2, the motor 13 drives the turntable 5 to rotate, the push block 41 separates from the first boss 511, and the return spring 10 drives the top shaft 4 and the locking piece to move downward along the vertical direction of the inner housing 1a. At this time, the blocking surface 2 322 can abut against the stop surface 621 and always maintain a gap between the middle piece 6 and the striker 2. After the striker 2 completes the nail shooting, the push block 41 passes through the second boss 512 on the turntable, and finally the locking portion 2 62 is fixed in the striker 2 again. As an alternative, when the striker 2 is unlocked, the locking portion 3 is located below the middle piece 6, and the corresponding drive mechanism is adjusted accordingly. Example 3

[0039] The structure of the third embodiment is essentially the same as that of the first embodiment, differing only in that an abutment shaft including an ejection block is further provided on the inner housing 1a, the ejection block being connected to the locking member 3. The ejection block 41 is not provided on the top shaft 4, and movement of the locking member 3 is achieved via the ejection block and the boss 51. In this embodiment, the abutment shaft is used to move the locking member vertically upward, and a return spring 10 on the top shaft 4 resets the locking member.

[0040] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0041] Although the following terms are frequently used herein: 1. housing; 2. striker; 21. groove; 3. locking member; 31. locking portion; 32. lock hook portion; 321. blocking surface 1; 322. blocking surface 2; 33. limiting hole; 4. top shaft; 41. abutting block; 42. limiting platform; 5. rotary disk; 51. boss; 511. first boss; 512. second boss; 6. intermediate member; 61. locking portion 1; 611. stop surface; 612. abutting surface; 62. locking portion 2; 7. rotating shaft; 8. limiting shaft; 9. fixing block; 10. return spring; 11. torsion spring; 12. blocking plate; 13. motor, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A firing pin locking structure for a nail gun, comprising an inner shell (1) and a firing pin (2) capable of moving relative to the inner shell (1) and used for nailing, wherein the inner shell (1) is further provided with a locking member (3) for indirectly or directly locking the firing pin (2), characterized in that: The inner shell (1) is further provided with a driving mechanism and a top shaft (4) that can move in a vertical direction of the inner shell (1) under the drive of the driving mechanism. The top shaft (4) is connected to the locking member (3). When the striker (2) is unlocked, the top shaft (4) and the locking member (3) can move in a vertical direction of the inner shell (1) and away from the striker (2).

2. The firing pin locking structure of the nail gun according to claim 1, characterized in that: The driving mechanism comprises a rotating disk (5) arranged in the inner housing (1), the rotating disk (5) being provided with at least one boss (51), one end of the top shaft (4) being connected to the locking member (3), and the other end of the top shaft (4) being provided with a supporting block (41) capable of supporting against the boss (51).

3. The firing pin locking structure of the nail gun according to claim 2, characterized in that: The top shaft (4) is provided with a return spring (10) for returning the top shaft (4), one end of the return spring (10) abuts against or is fixed on the top shaft (4), and the other end of the return spring (10) abuts against the inner shell (1).

4. The firing pin locking structure of the nail gun according to claim 1, characterized in that: The locking member (3) directly locks the striker (2), and a groove (21) is further provided on the striker (2). The locking member (3) includes a locking portion (31). When the striker (2) is locked, the locking portion (31) is located in the groove (21) and directly locks the striker (2); when the striker (2) is unlocked, the locking portion (31) is located above or below the groove (21).

5. The firing pin locking structure of the nail gun according to claim 4, characterized in that: The inner shell (1) is further provided with a fixing block (9) close to the locking member (3), the fixing block (9) and the locking member (3) being located on the same side of the striker (2), the fixing block (9) being further away from the striker (2) than the locking member (3), and when the striker (2) is locked, the fixing block (9), the locking member (3) and part of the structure of the striker (2) are on the same horizontal plane.

6. The firing pin locking structure of the nail gun according to claim 5, characterized in that: The contact portions of the fixing block (9) and the locking member (3) are both beveled and matched; or the fixing block (9) or the locking member (3) has a beveled surface.

7. The firing pin locking structure of a nail gun according to claim 1, characterized in that: The locking member (3) indirectly locks the striker (2), and a groove (21) is provided on the striker (2). An intermediate member (6) is provided between the locking member (3) and the striker (2), and the intermediate member (6) respectively has a locking portion 1 (61) and a locking portion 2 (62) that can be clamped on the striker (2). The locking member (3) can abut against the locking portion 1 (61) and prevent the intermediate member (6) from moving relative to the inner shell (1) so that the locking portion 2 (62) remains clamped with the groove (21) of the striker (2). A rotating shaft (7) is rotatably connected to the inner shell (1), and a torsion spring (11) is sleeved on the rotating shaft (7), one end of which can abut against the inner shell (1), and the other end of the torsion spring (11) is fixed to the rotating shaft (7). The intermediate member (6) is connected to the rotating shaft (7). When the striker (2) is unlocked, the locking member (3) is located above or below the intermediate member (6).

8. The firing pin locking structure of a nail gun according to claim 4 or 7, characterized in that: The inner housing (1) is also connected to a limiting shaft (8), and the locking member (3) is provided with a limiting hole (33) matching the limiting shaft (8), and the limiting shaft (8) is located in the limiting hole (33).

9. The firing pin locking structure of a nail gun according to claim 1, characterized in that: A turntable (5) connected to the output shaft of the motor (7) is further provided in the inner housing (1), a boss (51) is provided on the turntable (5), the top shaft (4) is fixedly connected to the locking member (3), a reset device (10) is provided on the top shaft (4), one end of which can abut against the inner housing (1), the other end of the reset device (10) abuts against the limit platform (42) of the top shaft (4), and the locking member (3) is further connected to a resting shaft, one end of which is provided with an ejection block, and the ejection block can abut against the boss (51).

10. The firing pin locking structure of a nail gun according to claim 5 or 8, characterized in that: The peripheries of the boss (51) and the abutting block (41) are arc-shaped, a limiting platform (42) or a fixing hole (43) is provided on the top shaft, and the return spring (10) abuts against the limiting platform (42) or is fixed in the fixing hole (43).

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