A nail gun safety protection device with an adjustable trigger mechanism

Abstract

This utility model relates to the field of nail gun technology, and more particularly to a nail gun safety protection device with an adjustable trigger mechanism. It includes a nozzle base, a pressure sleeve, a trigger rod assembly, an axial adjustment disc, a sensing component, and a reset elastic element. The pressure sleeve slides with a limiting pin on the nozzle base via an axial guide groove. The trigger rod assembly includes a front trigger rod and a linkage signal rod. The axial adjustment disc is adjustablely connected to the front end of the front trigger rod via a threaded connection and is fixedly connected to the pressure sleeve. The sensing component uses a non-contact combination of a permanent magnet on the linkage signal rod and a Hall sensor inside the nail gun. The reset elastic element is sleeved on the outside of the pressure sleeve and abuts against a spring mounting groove. This device adjusts the extension length of the trigger rod by rotating the axial adjustment disc, achieving stepless adjustment of trigger sensitivity. It uses magnetic induction instead of mechanical contacts, and the guide limit seat restricts the circumferential rotation of the trigger rod to ensure adjustment accuracy. It has advantages such as convenient operation, stable signal, and efficient maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of nail gun technology, and in particular relates to a nail gun safety protection device with an adjustable triggering mechanism. Background Technology

[0002] Traditional nail gun safety mechanisms often employ mechanical trigger-type safety devices. These devices use an axially movable contact at the nozzle; the safety lock is released when the contact retracts under pressure. For example, Chinese Utility Model Patent Publication No. CN218856867U discloses an adjustable safety device for a nail gun. The safety lever is connected to a microswitch on an adjustable trigger mechanism via a connector. During use, the firing block contacts the object to be nailed, causing the safety lever to move within a limiting groove. When the safety lever moves in the opposite direction of nailing, the connector drives the trigger lever to move in the same direction as the safety lever, bringing it into contact with the microswitch.

[0003] However, the existing technology has the following technical problems: First, the trigger sensitivity is adjusted by rotating the adjustable ratchet assembly. When the adjustable trigger mechanism fails, it usually requires disassembling the housing for maintenance, which is not only cumbersome to operate but also difficult to control more intuitively and accurately. In addition, the existing structure mostly uses direct contact sensors, which are prone to contact wear after long-term use, affecting the reliability of signal transmission. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a nail gun safety protection device with an adjustable triggering mechanism.

[0005] The purpose of this utility model can be achieved through the following technical solution: A nail gun safety protection device with an adjustable trigger mechanism includes a nozzle base and a pressing sleeve installed on the gun body. The nozzle base has a nail guide cavity communicating with the nail magazine. A nail ejection guide cylinder is provided at the front end of the nozzle base. The pressing sleeve is axially slidably fitted outside the nail ejection guide cylinder. It also includes a trigger rod assembly, an axial adjustment plate, a sensing assembly, and a reset elastic element. An axial guide groove is provided on the pressing sleeve. A limiting pin is provided on the nozzle base that slides with the axial guide groove. The trigger rod assembly includes a front trigger rod and a linkage signal rod coaxially connected. The axial adjustment plate is connected to the front end of the front trigger rod through a threaded part to form an adjustable threaded connection and is fixedly connected to the rear end of the pressing sleeve. The sensing assembly includes a permanent magnet provided on the linkage signal rod and a Hall sensor provided inside the gun body. One end of the reset elastic element is fitted and abuts against the outside of the pressing sleeve, and the other end abuts against a spring mounting groove formed on the nozzle base or the gun body.

[0006] Preferably, a guide limiting seat is fixed on the nozzle base or gun body. The guide limiting seat is sleeved on the outer periphery of the front trigger rod, and the inner wall of the guide limiting seat is provided with an anti-rotation limiting surface that matches the outer contour of the front trigger rod to limit the circumferential rotation of the front trigger rod.

[0007] Preferably, the anti-rotation limiting surface is formed as a polygonal cavity on the guide limiting seat, and a polygonal column segment matching the polygonal cavity is formed on the front trigger rod.

[0008] Preferably, the front trigger rod has an internal threaded hole on its front end face that communicates with its inner cavity and engages with the threaded mating part. The length of the threaded mating part is greater than the depth of the internal threaded hole. A limiting threaded hole is provided on the end face of the threaded mating part, and a first fastener that abuts against the inner wall of the front trigger rod is threaded onto the limiting threaded hole.

[0009] Preferably, the axial adjustment disc has a connector at its front end and the pressure sleeve has a connecting hole at its rear end that matches the connector. The connector is inserted into the connecting hole and the axial adjustment disc and the pressure sleeve are fixedly connected by a second fastener.

[0010] Preferably, the limiting pin has an observation hole that connects to the pin guide cavity.

[0011] Preferably, the pressure sleeve is provided with reinforcing ribs along its axial direction to connect its front end and rear end.

[0012] Preferably, there are at least two reset elastic elements that are evenly arranged.

[0013] Preferably, the outer sleeve of the pressure sleeve is provided with a mouth cover.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. The extension length of the front trigger rod can be directly adjusted by rotating the axial adjustment disc on the outside of the gun body, thereby changing the trigger threshold of the Hall sensor. The operation is convenient, intuitive and efficient.

[0016] 2. By combining permanent magnets with Hall sensors, traditional mechanical contacts are replaced, completely eliminating signal failure caused by contact wear and improving long-term stability.

[0017] 3. The guide limit seat restricts the circumferential rotation of the front trigger rod, ensuring that only axial movement occurs during the adjustment process, avoiding thread wear or adjustment failure. The first fastener prevents the axial adjustment disc from coming off, and the second fastener facilitates quick disassembly and assembly, taking into account both safety and maintenance efficiency.

[0018] 4. At least two reset elastic elements are evenly arranged to improve the reset acceleration. Even if a single reset elastic element fails, the basic function can still be guaranteed, thus enhancing reliability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram showing the disassembled structure of this utility model.

[0021] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0022] In the diagram, 1. Nozzle base; 11. Nail guide cavity; 12. Nail ejection guide cylinder; 13. Limiting pin; 13a. Observation hole; 2. Contact sleeve; 21. Axial guide groove; 22. Connecting hole; 23. Reinforcing rib; 24. Nozzle sleeve; 3. Trigger rod assembly; 31. Front trigger rod; 31a. Polygonal cylinder; 31b. Internal threaded hole; 32. Linkage signal rod; 4. Axial adjustment disc; 41. Threaded mating part; 41a. Limiting threaded hole; 42. Connector; 43. First fastener; 44. Second fastener; 5. Sensing assembly; 51. Permanent magnet; 52. Hall sensor; 6. Reset elastic element; 7. Guide limit seat; 8. Gun body; 81. Spring mounting groove; 9. Nail magazine. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] like Figures 1-3 As shown, this embodiment provides a safety protection device for a nail gun with an adjustable trigger mechanism, including a nozzle base 1 and a pressure sleeve 2 mounted on the gun body 8. The nozzle base 1 has a nail guide cavity 11 communicating with the nail magazine 9. A nail ejection guide cylinder 12 is provided at the front end of the nozzle base 1. The pressure sleeve 2 is axially slidably sleeved on the nail ejection guide cylinder 12. It also includes a trigger rod assembly 3, an axial adjustment disc 4, a sensing assembly 5, and a reset elastic element 6. An axial guide groove 21 is provided on the pressure sleeve 2, and the nozzle base 1 has an axial guide groove. 21. The limiting pin 13 with sliding fit; the trigger rod assembly 3 includes a front trigger rod 31 and a linkage signal rod 32 coaxially connected; the axial adjustment disc 4 is connected to the front end of the front trigger rod 31 through a threaded fit part 41 to form an adjustable threaded connection and is fixedly connected to the rear end of the contact sleeve 2; the sensing assembly 5 includes a permanent magnet 51 on the linkage signal rod 32 and a Hall sensor 52 inside the gun body 8; one end of the reset elastic member 6 is sleeved and abuts against the outside of the contact sleeve 2 and the other end abuts against the spring mounting groove 81 formed on the nozzle base 1 or the gun body 8.

[0025] Regarding the adjustment of trigger sensitivity, the operator directly drives the front trigger rod 31 to move axially along the threaded mating part 41 by rotating the axial adjustment disc 4, thereby changing the distance between the front trigger rod 31 and the axial adjustment disc 4, i.e., changing the extension length of the front trigger rod 31. The length of the front trigger rod 31 determines the travel distance of the linkage signal rod 32 when the pressure sleeve 2 is retracted under pressure, thus adjusting the trigger distance between the permanent magnet 51 and the Hall sensor 52. For example, the longer the extension length of the front trigger rod 31, the smaller the retraction amount of the pressure sleeve 2 is required to bring the permanent magnet 51 into the effective sensing range of the Hall sensor 52, thereby reducing the triggering pressure; conversely, a larger pressure is required to trigger. This adjustment process is intuitive and requires no tools or disassembly of the gun body 8, significantly improving operational convenience.

[0026] This nail gun safety protection device uses non-contact signal transmission. When the pressure sleeve 2 is compressed and retracts, the trigger rod assembly 3 moves backward synchronously, causing the permanent magnet 51 at the end of the linkage signal rod 32 to move closer to the Hall sensor 52. When the distance between the two reaches a preset threshold, the Hall sensor 52 outputs an electrical signal based on the change in magnetic field strength, driving the nail gun firing mechanism to operate. Since there is no physical contact between the permanent magnet 51 and the Hall sensor 52, the signal failure problem caused by contact wear in traditional microswitches is avoided, significantly improving the reliability of long-term use.

[0027] After firing, the reset elastic element 6 releases its stored energy, pushing the contact sleeve 2 back to its initial position along the axial guide groove 21. At this time, the permanent magnet 51 moves away from the Hall sensor 52, the trigger signal is interrupted, and the device returns to the ready-to-trigger state. The cooperation between the limit pin 13 and the guide groove 21 not only restricts the circumferential rotation of the contact sleeve 2, but also ensures its axial movement trajectory is accurate, avoiding false triggering or jamming caused by skewness, and has strong reset and self-adaptive capabilities.

[0028] The working principle of this nail gun safety protection device in practical applications:

[0029] Initial ready-to-trigger state: The reset elastic element 6 is in its naturally extended state, pushing the contact sleeve 2 to its axial foremost position. At this time, the distance between the permanent magnet 51 and the Hall sensor 52 is at its maximum, the Hall sensor 52 has no signal output, the nail gun is in a locked state, and cannot be fired. The nails in the nail magazine 9 enter the nail guide cavity 11, waiting to be fired;

[0030] Safety test phase: The operator presses the front end of the pressure sleeve 2 against the workpiece surface and applies pressure. Upon pressure, the pressure sleeve 2 retracts axially along the guide cylinder 12, compressing and resetting the elastic element 6. The axial guide groove 21 of the pressure sleeve 2 engages with the limiting pin 13 of the nozzle base 1, ensuring that the pressure sleeve 2 moves only axially, preventing skewness or circumferential rotation. The retraction of the pressure sleeve 2 causes the axial adjusting disc 4, which is fixed to it, to move backward, thereby pushing the trigger rod assembly 3 backward as a whole.

[0031] Magnetic induction triggering stage: The permanent magnet 51 on the linkage signal rod 32 moves backward with the trigger rod assembly 3, gradually approaching the Hall sensor 52 inside the gun body 8. When the distance between them decreases to a preset threshold, the Hall sensor 52 detects the change in magnetic field strength, generates a trigger signal, and transmits it to the control circuit. After receiving the valid trigger signal, the control circuit activates the drive mechanism of the nail gun (such as a pneumatic valve or motor), drives the firing pin to impact the nail body, and the nail body enters the nail guide cylinder 12 from the nail guide cavity 11 and is then ejected, completing the nailing action;

[0032] Reset Phase: After firing, the operator releases the pressure on the contact sleeve 2. The elastic force of the reset elastic element 6 pushes the contact sleeve 2 forward along the axial guide groove 21, returning it to its initial position. The linkage signal rod 32 moves the permanent magnet 51 away from the Hall sensor 52, and the magnetic field strength drops below the trigger threshold. The Hall sensor 52 stops outputting a signal, and the nail gun re-enters the locked state to prevent accidental triggering.

[0033] In this embodiment, a guide limiting seat 7 is fixed on the nozzle base 1 or the gun body 8. The guide limiting seat 7 is sleeved on the outer periphery of the front trigger rod 31. The inner wall of the guide limiting seat 7 is provided with an anti-rotation limiting surface 71 that matches the outer contour of the front trigger rod 31 to limit the circumferential rotation of the front trigger rod 31.

[0034] Specifically, the outer circumferential cross-section of the front trigger rod 31 is designed as a non-circular structure, and the anti-rotation limiting surface 71 of the guide limit seat 7 is perfectly matched with it, forming a circumferential limiting fit. The guide limit seat 7 provides support for the front trigger rod 31 and provides precise axial guidance. During sensitivity adjustment, because the front trigger rod 31 is restricted from circumferential rotation by the guide limit seat 7, when the operator rotates the axial adjustment disc 4, the front trigger rod 31 only extends and retracts linearly along the axial direction. The front trigger rod 31 only transmits axial displacement, avoiding thread wear or adjustment failure caused by accidental rotation of the front trigger rod 31.

[0035] Furthermore, such as Figure 2 As shown, the anti-rotation limiting surface 71 is formed into a polygonal inner cavity on the guide limiting seat 7, and a polygonal column 31a segment matching the polygonal inner cavity is formed on the front trigger rod 31. The anti-rotation limiting surface 71 of the guide limiting seat 7 is precision machined to form a polygonal inner cavity, and a polygonal column 31a segment matching the polygonal inner cavity is machined on the corresponding front trigger rod 31. The two form a high-precision sliding pair to ensure that the front trigger rod 31 slides smoothly without jamming.

[0036] like Figure 3As shown, in this embodiment, an internal threaded hole 31b is formed on the front end face of the front trigger rod 31, which communicates with its inner cavity and engages with the threaded mating part 41. The length of the threaded mating part 41 is greater than the depth of the internal threaded hole 31b. A limiting threaded hole 41a is formed on the end face of the threaded mating part 41, and a first fastener 43 that can abut against the inner wall of the front trigger rod 31 is threaded onto the limiting threaded hole 41a.

[0037] The front end of the threaded part 41 can extend into the inner cavity of the front trigger rod 31, and the first fastener 43 can abut against the inner wall of the front trigger rod 31 to form a rigid stop, preventing the axial adjustment disc 4 from accidentally popping out of the front trigger rod 31 due to vibration or impact and reverse rotation.

[0038] Furthermore, the front end of the axial adjustment disc 4 is provided with a connector 42, and the rear end of the pressure sleeve 2 is provided with a connection hole 22 that matches the connector 42. The connector 42 is inserted into the connection hole 22 and the axial adjustment disc 4 and the pressure sleeve 2 are fixedly connected by the second fastener 44.

[0039] The axial adjustment disc 4 can be rotated only after the second fastener 44 is loosened. After removing the second fastener 44, the axial adjustment disc 4 can be pulled out directly without disassembling the pressure sleeve 2 or other components, making installation convenient and improving maintenance efficiency.

[0040] Furthermore, the limiting pin 13 is provided with an observation hole 13a that connects to the nail guide cavity 11. This allows the user to observe the condition of the nail inside the nail guide cavity 11 through the observation hole 13a, preventing the nail from getting stuck and facilitating timely troubleshooting.

[0041] Furthermore, a reinforcing rib 23 is provided along the axial direction of the pressure sleeve 2 to connect its front end and rear end. During the process of the front end of the pressure sleeve 2 pressing against the workpiece surface and during the process of the nail being driven out, vibration and impact forces will be generated. The reinforcing rib 23 can effectively improve the impact resistance of the pressure sleeve 2 and can also effectively improve the connection strength between the rear end of the pressure sleeve 2 and the axial adjustment disc 4.

[0042] Furthermore, the reset elastic elements 6 are at least two and evenly arranged. Multiple reset elastic elements 6 increase the reset acceleration of the pressure sleeve 2, making it particularly suitable for high-speed continuous nailing operations. The even arrangement ensures uniform force applied to the pressure sleeve 2 and automatically corrects its position. The redundant design of multiple reset elastic elements 6 means that if a single reset elastic element 6 breaks or fails, the remaining reset elastic elements 6 can still provide ≥50% of the reset force, ensuring the device does not lose its basic function and providing a buffer for safe operation.

[0043] Furthermore, the pressure sleeve 2 is covered with a nozzle sleeve 24. The nozzle sleeve 24 prevents the nail guide cylinder 12 on the nozzle base 1 and the front end of the pressure sleeve 2 from directly contacting and wearing with the workpiece surface, thus improving the durability of the equipment. The nozzle sleeve 24 extends the nailing range and can be extended into narrow spaces. The nozzle sleeve 24 is generally made of soft material to prevent scratching the surface of the workpiece being nailed, and plays a role in buffering and reducing nailing noise.

[0044] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A safety protection device for a nail gun with an adjustable trigger mechanism, comprising a nozzle base (1) and a pressure sleeve (2) mounted on a gun body (8), wherein the nozzle base (1) has a nail guide cavity (11) communicating with a nail magazine (9), and a nail ejection guide cylinder (12) is provided at the front end of the nozzle base (1), and the pressure sleeve (2) is axially slidably sleeved on the outside of the nail ejection guide cylinder (12), characterized in that, It also includes a trigger rod assembly (3), an axial adjustment disc (4), a sensing assembly (5), and a reset elastic element (6). An axial guide groove (21) is provided on the pressure sleeve (2), and a limiting pin (13) that slides with the axial guide groove (21) is provided on the nozzle base (1). The trigger rod assembly (3) includes a front trigger rod (31) and a linkage signal rod (32) connected coaxially. The axial adjustment disc (4) is connected to the front end of the front trigger rod (31) through a threaded engagement part (41) and is fixedly connected to the rear end of the pressure sleeve (2). The sensing assembly (5) includes a permanent magnet (51) provided on the linkage signal rod (32) and a Hall sensor (52) provided inside the gun body (8). One end of the reset elastic element (6) is sleeved and abuts against the outside of the pressure sleeve (2), and the other end abuts against the spring mounting groove (81) formed on the nozzle base (1) or the gun body (8).

2. A nail gun safety protection device with an adjustable triggering mechanism according to claim 1, characterized in that, A guide limiting seat (7) is fixed on the nozzle base (1) or the gun body (8). The guide limiting seat (7) is sleeved on the outer periphery of the front trigger rod (31). The inner wall of the guide limiting seat (7) is provided with an anti-rotation limiting surface (71) that matches the outer contour of the front trigger rod (31) to limit the circumferential rotation of the front trigger rod (31).

3. A nail gun safety protection device with an adjustable triggering mechanism according to claim 2, characterized in that, The anti-rotation limiting surface (71) is formed into a polygonal inner cavity on the guide limiting seat (7), and a polygonal column (31a) segment matching the polygonal inner cavity is formed on the front trigger rod (31).

4. A nail gun safety protection device with an adjustable triggering mechanism according to claim 1 or 2, characterized in that, The front trigger rod (31) has an internal threaded hole (31b) on its front end face that communicates with its inner cavity and engages with the threaded engagement part (41). The length of the threaded engagement part (41) is greater than the depth of the internal threaded hole (31b). A limiting threaded hole (41a) is opened on the end face of the threaded engagement part (41). A first fastener (43) that can abut against the inner wall of the front trigger rod (31) is threaded onto the limiting threaded hole (41a).

5. A nail gun safety protection device with an adjustable triggering mechanism according to claim 4, characterized in that, The axial adjustment disc (4) has a connector (42) at its front end and a connecting hole (22) at its rear end that matches the connector (42). The connector (42) is inserted into the connecting hole (22) and the axial adjustment disc (4) is fixedly connected to the connecting hole (2) by a second fastener (44).

6. A nail gun safety protection device with an adjustable triggering mechanism according to claim 1 or 5, characterized in that, The limiting pin (13) has an observation hole (13a) that connects to the guide cavity (11) of the nail track.

7. A nail gun safety protection device with an adjustable triggering mechanism according to claim 1 or 5, characterized in that, A reinforcing rib (23) is provided along the axial direction of the pressure sleeve (2) to connect its front end and rear end.

8. A nail gun safety protection device with an adjustable triggering mechanism according to claim 1 or 5, characterized in that, The reset elastic element (6) is at least two and is evenly arranged.

9. A nail gun safety protection device with an adjustable triggering mechanism according to claim 1 or 5, characterized in that, The pressure sleeve (2) is covered with a mouth cover (24).

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