Nail gun

Abstract

A nail gun. The nail gun comprises a nose for nail ejection, a piston-firing pin assembly (1) acting from a first position to a second position to hit a nail into a hit object, and a cylinder serving as an energy storage device; the piston-firing pin assembly (1) comprises a piston (11) and a firing pin (12) which are fixedly connected; the piston (11) is adapted to the cylinder; and a plurality of engaging teeth (121) are machined on one side of the firing pin. The nail gun further comprises a motor, a driving shaft connected to the motor, a lifting / lowering wheel enabling the piston-firing pin assembly (1) to move from the second position to the first position, and an engaging component (3) arranged on the lifting / lowering wheel and working in conjunction with the engaging teeth (121); the engaging component (3) comprises a plurality of first engaging members (31) arranged in the direction of rotation of the lifting / lowering wheel, a second engaging member (32) located at the head of all the engaging members in the direction of rotation of the lifting / lowering wheel, and an abutting member (33) acting on the second engaging member (32) to abut against same; the abutting member (33) gives the second engaging member (32) a set value, and when nail jamming occurs and the force applied by the engaging teeth (121) to the second engaging member (32) exceeds the set value, the second engaging member (32) provides clearance by means of rotation, avoiding the occurrence of a direct rigid impact between the second engaging member (32) and any engaging tooth (121) of the firing pin (12).

Description

A nail gun Technical Field

[0001] The utility model relates to a nail gun. Background Art

[0002] A nail gun, also known as a driver, is generally driven by an electric motor. Single-cylinder nail guns are more easily accepted by consumers due to their small size and portability. For example, the invention patent application with application publication number CN113490574A, entitled Driver, is an example of a single-cylinder electric nail gun.

[0003] A single-cylinder nail gun generally includes a cylinder as an energy accumulator, a piston-striker assembly matched with the cylinder, and a lifting wheel driven by a motor to rotate in one direction. The lifting wheel matches the teeth on one side of the firing pin through multiple pins on the circumference, thereby making the firing pin reciprocate between the first position (upper stop) and the second position (lower stop), thereby realizing the nailing action and the firing pin returning to its position.

[0004] During the use of the nail gun, nail jamming may occur due to special circumstances (such as the object being driven is too hard). At this time, the firing pin is stopped at a position between the first position (upper stop) and the second position (lower stop). When the lifting wheel rotates, the pin shaft located at the head of the lifting wheel along the rotation direction may have a direct rigid impact with a certain tooth of the firing pin, causing fatigue and damage to the components.

[0005] In order to deal with the situation where nails are stuck in the nail heads, the driving machine involved in the authorization announcement number CN107708934B provides the following solution. Specifically, as summarized in right 1 of its authorization text, "the engaging component can move radially relative to the above-mentioned drive shaft in the above-mentioned rotating element." In this solution, the way in which the engaging component achieves retraction by moving radially relative to the rotating element is actually that the striking member forces the engaging component to overcome the force applied by the force-applying member. Specifically, a guide hole is provided on the rotating element, and the engaging component moves in a straight line along the path of the guide hole. When a nail is stuck, the force applied to the engaging component by the striking member is applied at multiple different positions, and the force applied to the engaging component is not along the direction of the guide hole, resulting in a force between the engaging component and the wall of the guide hole, causing different degrees of wear, and the force-applying member is also prone to fatigue and a change in the elastic coefficient. That is, the way in which the engaging component achieves retraction by moving radially relative to the rotating element has the problem of low stability, and the wear problem of components also needs to be further improved.

[0006] Utility Model Content

[0007] In view of the shortcomings existing in the above problems, the utility model provides a nail gun.

[0008] To achieve the above-mentioned object, the present invention provides a nail gun, which comprises a nail head for supplying nails, a piston-striker assembly for moving from a first position to a second position to drive the nail into an object to be driven, and a cylinder serving as an energy accumulator, wherein the piston-striker assembly comprises a piston and a striker that are fixedly connected, the piston and the cylinder forming an adapter, and a plurality of teeth are formed on one side of the striker, and the nail gun also comprises a motor;

[0009] a drive shaft connected to the motor;

[0010] a lifting wheel connected to the drive shaft and moving the piston striker assembly from the second position to the first position; and a locking component provided on the lifting wheel and interacting with the locking teeth;

[0011] When the engaging member is in an engaged state with the engaging teeth, the lifting wheel rotates, and the engaging member moves in the circumferential direction of the lifting wheel, so that the piston striker assembly moves from the second position to the first position;

[0012] The engaging components include a plurality of first clamps fixedly arranged along the rotation direction of the lifting wheel, a second clamp located at the head of the row along the rotation direction of the lifting wheel, and a supporting member acting on the second clamp to support the second clamp. The supporting member gives the second clamp a set value. When the clamp occurs and the force applied by the clamping teeth to the second clamp exceeds the set value, the second clamp rotates to avoid direct rigid impact between the second clamp and any clamping teeth on the striker.

[0013] Furthermore, the second clamping member is composed of a pivot shaft arranged parallel to and offset from the driving shaft, a clamping member body with the pivot shaft as the rotation center axis, and an elastic member. The elastic member applies a force to keep the locking portion of the clamping member body and multiple first clamping members on the same circumference, and the pivot shaft serving as the rotation center axis is located inside the circumference, that is, when the force on the locking portion reaches the set value, the clamping member body overcomes the force applied by the elastic member and the supporting member and avoids to the inside of the circumference by rotating, so that the locking portion can avoid direct rigid impact with any tooth on the firing pin when clamping the nail.

[0014] Furthermore, the lifting wheel has an upper panel and a lower panel, the upper panel and the lower panel have a notch formed on the same side, the first clamping member is a pin, and a plurality of pins are fixedly connected between the upper panel and the lower panel.

[0015] Furthermore, the elastic member is a torsion spring sleeved on the pivot shaft, which is used for automatic reset of the second clamping member after rotation. One torsion arm of the torsion spring is fixed on the lifting wheel, and the other torsion arm of the torsion spring abuts against the back of the engaging portion.

[0016] Furthermore, a one-way clutch is arranged between the motor and the drive shaft, so that the lifting wheel can only rotate in one direction. The clamping body also has an integrally formed guide portion, which includes an upper guide plate and a lower guide plate. The upper guide plate and the lower guide plate both extend in an arc shape from the engaging portion along the rotation direction of the lifting wheel to a set length.

[0017] Furthermore, the supporting parts have two groups that are symmetrically arranged in the upper and lower directions. The supporting parts include a supporting spring and a supporting steel ball located at the supporting action end of the supporting spring. The end of the supporting spring away from the supporting steel ball acts on the upper pressure plate or the lower pressure plate, and a steel ball groove matching the supporting steel ball is formed on the main body of the clamp.

[0018] The beneficial effects of the present invention compared to the prior art are:

[0019] 1. The second clamping member is rotatably arranged at the leading position in the rotation direction of the lifting wheel. When the force on the engaging part caused by the nail exceeds the set value, the clamping member body will rotate and avoid the locking teeth. During this process, the clamping member body rotates under the action of the force couple, which greatly reduces the impact and wear on itself, making the overall structure of the lifting wheel more stable and enhancing the durability of the nail gun.

[0020] 2. The holding steel ball of the holding piece can lock the second clamping piece, ensuring that the second clamping piece does not rotate under normal nailing conditions. The setting value of the second clamping piece's rotation can be adjusted by selecting the holding spring to meet the different force requirements of different nail guns. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram showing the relative positions of the lifting wheel and the piston striker assembly involved;

[0022] FIG2 is a schematic diagram of a piston striker assembly;

[0023] FIG3 is a schematic diagram of the lifting wheel involved;

[0024] FIG4 is an exploded view of FIG3 ;

[0025] FIG5 is a first schematic diagram of the second clamp involved;

[0026] FIG6 is a second schematic diagram of the second clamp involved;

[0027] 7 to 10 are step-by-step schematic diagrams of the action process of the second clamping member before and after the jamming occurs.

[0028] In the figure: 1. Piston and striker assembly; 11. Piston; 12. Striker; 121. Gear; 2. Lifting wheel; 21. Upper panel; 22. Lower panel; 2a. Notch; 3. Engaging component; 31. First engaging member; 32. Second engaging member; 321. Pivot shaft; 322. Engaging member body; 3221. Engaging part; 3222. Upper guide piece; 3223. Lower guide piece; 322a. Steel ball groove; 323. Elastic member; 33. Holding member; 331. Holding spring; 332. Holding steel ball; 333. Upper pressure plate; 334. Lower pressure plate. DETAILED DESCRIPTION

[0029] As shown in Figures 1 to 6, a nail gun according to an embodiment of the present invention comprises a nail head for supplying nails, a piston striker assembly 1 that moves from a first position to a second position to drive the nail into the object to be driven, and a cylinder as an energy accumulator. The piston striker assembly 1 comprises a fixed piston 11 and a striker 12, the piston 11 is adapted to the cylinder, and a plurality of latching teeth 121 are formed on one side of the striker 12. The nail gun further comprises a motor, a drive shaft connected to the motor, a lifting wheel 2 connected to the drive shaft and moving the piston striker assembly 1 from the second position to the first position, and a clamping component 3 provided on the lifting wheel 2 and interacting with the latching teeth 121; when the clamping component 3 and the latching teeth 121 are in a clamping state, the lifting wheel 2 rotates, The engaging component 3 moves in the circumferential direction of the lifting wheel 2, so that the piston striker assembly 1 moves from the second position to the first position; the engaging component 3 includes a plurality of first clamping members 31 fixedly arranged along the rotation direction of the lifting wheel 2, a second clamping member 32 located at the head of the row along the rotation direction of the lifting wheel 2, and a supporting member 33 acting on the second clamping member 32 to support it. The supporting member 33 gives the second clamping member 32 a set value. When the nail is stuck and the force given to the second clamping member 32 by the clamping tooth 121 exceeds the set value of the sum of the force of the supporting member 33 and the elastic member 323, the second clamping member 32 avoids by rotating to avoid direct rigid impact between the second clamping member 32 and any clamping tooth 121 on the striker 12.

[0030] More specifically, the second clamping member 32 is composed of a pivot shaft 321 arranged parallel to and offset from the driving shaft, a clamping member body 322 with the pivot shaft 321 as the rotation center axis, and an elastic member 323. The elastic member 323 applies a force to keep the engagement portion 3221 of the clamping member body 322 and the plurality of first clamping members 31 on the same circumference, and the pivot shaft 321 as the rotation center axis is located inside the circumference, that is, when the force on the engagement portion 3221 reaches the set value, the clamping member body 322 overcomes the elastic member 323. 323, the force applied by the supporting member 33 is avoided to the inside of the circumference by rotation, so that the engaging portion 3221 can avoid direct rigid impact with any locking tooth 121 on the striker 12 when the nail is clamped; the lifting wheel 2 has an upper panel 21 and a lower panel 22, and a notch portion 2a is formed on the same side of the upper panel 21 and the lower panel 22. The first clamping member 31 is a pin, and multiple pins are fixedly connected between the upper panel 21 and the lower panel 22 by riveting; the elastic member 323 is a torsion spring sleeved on the pivot shaft 321 One torsion arm of the torsion spring is fixed on the lifting wheel 2, and the other torsion arm of the torsion spring abuts against the back of the engaging portion 3221; a one-way clutch is arranged between the motor and the drive shaft, so that the lifting wheel 2 can only rotate in one direction (counterclockwise in Figure 1), and the clamping body 322 also has an integrally formed guide portion, which includes an upper guide piece 3222 and a lower guide piece 3223. The upper guide piece 3222 and the lower guide piece 3223 are both arc-shaped starting from the engaging portion 3221 along the rotation direction of the lifting wheel 2. The shape extends to a set length; the supporting parts 33 have two groups and are symmetrically arranged in an upper and lower manner. The supporting parts 33 include a supporting spring 331 and a supporting steel ball 332 located at the supporting action end of the supporting spring 331. The end of the supporting spring 331 away from the supporting steel ball 332 acts on the upper pressure plate 333 or the lower pressure plate 334. The upper pressure plate 333 and the lower pressure plate 334 are respectively fastened to the upper panel 21 and the lower panel 22 by connecting bolts. A steel ball groove 322a matching the supporting steel ball 332 is formed on the clamp body 322.

[0031] The second clamping member is rotatably arranged at the leading position in the rotation direction of the lifting wheel. When the force on the engaging part caused by the nail exceeds the set value, the clamping member body will rotate and avoid the clamping tooth. In this process, the clamping member body rotates under the action of the force couple, and the impact and wear on itself are greatly reduced, making the overall structure of the lifting wheel more stable and the durability of the nail gun enhanced. The holding steel ball of the holding member can lock the second clamping member to ensure that the second clamping member does not rotate under normal nailing conditions. The setting value of the rotation of the second clamping member can be adjusted by selecting the holding spring to meet the different force requirements of different nail guns.

[0032] In order to facilitate understanding of the present invention, the following description will be given in conjunction with the accompanying drawings.

[0033] Figures 7 to 10 are step-by-step schematic diagrams of the action process of the second clamping member before and after the occurrence of the jam;

[0034] Referring to FIG7 , when the nail is stuck in the ejection path, the firing pin cannot fully reach the second position (the lower stop), and the firing pin stays at a position between the first position and the second position;

[0035] Referring to FIG8 , the lifting wheel rotates counterclockwise, the engaging portion begins to contact the fourth tooth of the striker, and the position deviation caused by the staples prevents the two from matching accurately;

[0036] Referring to FIG9 , the force exerted by the fourth latching tooth on the engaging portion exceeds a set value (the set value is provided by the two symmetrically arranged supporting members and the elastic member), causing the second latching member to actuate. Specifically, the latching member body rotates with the pivot axis as the rotation center, overcoming the force exerted by the elastic member and the two supporting members and moving inward. At the same time, the supporting steel ball leaves the position of the steel ball groove, causing the supporting spring to contract. As the lifting wheel continues to rotate counterclockwise, the engaging portion of the second latching member passes over the fourth latching tooth of the striker.

[0037] Referring to Figure 10, the lifting wheel continues to rotate counterclockwise. Since the engaging portion is no longer under force, the elastic member resets the second engaging member. At the same time, the holding spring returns the holding steel ball to the position of the steel ball groove. After that, the engaging portion of the second engaging member matches the third tooth of the firing pin and gradually drives the firing pin to reset to the first position.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A nail gun comprising a nail head for delivering nails, a piston-striker assembly for moving from a first position to a second position to drive the nail into an object, and a cylinder serving as an energy accumulator, wherein the piston-striker assembly includes a piston and a striker that are fixedly connected, the piston being adapted to fit within the cylinder, and a plurality of teeth formed on one side of the striker, characterized in that: include Motor; a drive shaft connected to the motor; a lifting wheel connected to the drive shaft and moving the piston striker assembly from the second position to the first position; and a locking component provided on the lifting wheel and interacting with the locking teeth; When the engaging member is in an engaged state with the engaging teeth, the lifting wheel rotates, and the engaging member moves in the circumferential direction of the lifting wheel, so that the piston striker assembly moves from the second position to the first position; The engaging components include a plurality of first clamps fixedly arranged along the rotation direction of the lifting wheel, a second clamp located at the head of the row along the rotation direction of the lifting wheel, and a supporting member acting on the second clamp to support the second clamp. The supporting member gives the second clamp a set value. When the clamp occurs and the force applied by the clamping teeth to the second clamp exceeds the set value, the second clamp rotates to avoid direct rigid impact between the second clamp and any clamping teeth on the striker.

2. A nail gun according to claim 1, characterized in that: The second clamping member is composed of a pivot shaft arranged parallel to and offset from the driving shaft, a clamping member body with the pivot shaft as the rotation center axis, and an elastic member. The elastic member applies a force to keep the engagement part of the clamping member body and multiple first clamping members on the same circumference, and the pivot shaft serving as the rotation center axis is located inside the circumference, that is, when the force on the engagement part reaches the set value, the clamping member body overcomes the force applied by the elastic member and the supporting member and avoids to the inside of the circumference by rotating, so that the engagement part can avoid direct rigid impact with any tooth on the firing pin when clamping the nail.

3. A nail gun according to claim 2, characterized in that: The lifting wheel has an upper panel and a lower panel. A notch is formed on the same side of the upper panel and the lower panel. The first clamping member is a pin. A plurality of pins are fixedly connected between the upper panel and the lower panel.

4. A nail gun according to claim 3, characterized in that: The elastic member is a torsion spring sleeved on the pivot shaft, which is used for automatically resetting the second clamping member after rotation. One torsion arm of the torsion spring is fixed on the lifting wheel, and the other torsion arm of the torsion spring abuts against the back of the engaging portion.

5. The nail gun according to claim 4, characterized in that: A one-way clutch is arranged between the motor and the drive shaft, so that the lifting wheel can only rotate in one direction. The clamping body also has an integrally formed guide portion, which includes an upper guide piece and a lower guide piece. The upper guide piece and the lower guide piece both extend in an arc shape from the engaging portion along the rotation direction of the lifting wheel to a set length.

6. The nail gun according to claim 5, characterized in that: The supporting parts have two groups symmetrically arranged in an upper and lower direction, and the supporting parts include a supporting spring and a supporting steel ball located at the supporting action end of the supporting spring. The end of the supporting spring away from the supporting steel ball acts on the upper pressure plate or the lower pressure plate, and a steel ball groove matching the supporting steel ball is formed on the main body of the clamp.

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