Nail gun

Abstract

The invention discloses a nail gun, comprising: a housing, formed with a containing space; a cylinder, connected to the housing and used for storing gas; a firing assembly, at least partially arranged in the cylinder, capable of moving from an initial position to a firing position in the cylinder to drive a nail; a power output part, arranged in the containing space formed by the housing, used for outputting a driving force to drive the firing assembly to move in the cylinder; a driving wheel, connected to an output shaft of the power output part, used for driving the firing assembly to move in the cylinder under the drive of the power output part; a first check piece, used for blocking the firing assembly from moving from the initial position to the firing position; and further comprising: a second check piece, coaxially connected to the output shaft with the driving wheel, used for cooperating with the first check piece to block the firing assembly from moving from the initial position to the firing position. The invention provides a nail gun with a low cost and high reliability using a mechanical latch.

Description

Technical Field

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

[0002] The principles of existing nail gun products on the market can be divided into mechanical and cylinder types. Among them, the cylinder nail gun uses the gas in the cylinder to push out the firing assembly to perform the nailing action. The process of the firing assembly moving from the initial position in the cylinder to the firing position and then from the firing position to the initial position can be defined as a nailing cycle. When the firing assembly is in the initial position, a latch is generally provided to ensure that it does not accidentally slip off and cause a safety accident by driving a nail. When the firing assembly is in the initial position or near it, the latch can lock the position of the firing assembly to prevent it from accidentally slipping off.

[0003] The prior art generally uses an electromagnetic device to control the opening and closing of a latch structure, which is costly and occupies a large volume. Moreover, when working for a long time, the increase in temperature will affect the electromagnetic field, causing the performance of the latch structure to be unstable, thereby reducing the safety of the nail gun. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, an object of the present invention is to provide a nail gun using a mechanical latch with low cost and high reliability.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A nail gun comprises: a shell, which is formed with a accommodating space; a cylinder, which is connected to the shell and is used to store gas; a firing assembly, which is at least partially arranged in the cylinder and can move from an initial position to a firing position in the cylinder to drive a nail; a power output part, which is arranged in the accommodating space formed by the shell and is used to output a driving force to drive the firing assembly to move in the cylinder; a driving wheel, which is connected to the output shaft of the power output part and is used to drive the firing assembly to move in the cylinder under the drive of the power output part; a first check member, which is used to block the firing assembly from moving from the initial position to the firing position; and also includes: a second check member, which is coaxially connected to the output shaft with the driving wheel and is used to cooperate with the first check member to block the firing assembly from moving from the initial position to the firing position.

[0007] Furthermore, the second anti-return member is a cam; the cam has a protruding portion and a non-protruding portion.

[0008] Furthermore, the driving wheel includes a first section in which a plurality of driving teeth are evenly distributed and a second section that is smooth and continuous; the protruding portion of the cam corresponds to the second section of the driving wheel in the axial direction of the output shaft; and the non-protruding portion of the cam corresponds to the first section of the driving wheel in the axial direction of the output shaft.

[0009] Furthermore, the junction between the protruding portion of the cam and the non-protruding portion is a continuous and smooth curved surface or plane.

[0010] Furthermore, the first anti-return member includes: a locking portion, which locks the firing assembly when the firing assembly is located at the initial position or near the initial position; a follower, which can be pushed by the protrusion of the cam to drive the locking portion to unlock the firing assembly, so that the firing assembly can move from the initial position to the firing position to complete the firing action; and an elastic member, which is connected to the locking portion and can push the locking portion to lock the firing assembly.

[0011] Furthermore, the thrust force applied by the follower to the locking portion is in a direction opposite to the elastic force applied by the elastic member to the locking portion.

[0012] Furthermore, the elastic member includes a spring or a spring sheet.

[0013] Furthermore, the follower is a latch structure.

[0014] Furthermore, the firing assembly includes: a piston located in the cylinder; a firing pin fixed on the piston; a plurality of transmission teeth are provided on one side of the firing pin, and a non-returning tooth is provided on the other side.

[0015] Furthermore, the anti-reverse tooth is a ratchet tooth; the tooth tip of the ratchet tooth faces the firing position.

[0016] The invention is beneficial in that: by providing a connecting piece connected between the driving wheel and the latch, the nail gun has higher reliability and more compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional picture of a nail gun;

[0018] Figure 2 yes Figure 1 A cross-sectional view of a nail gun in FIG.

[0019] Figure 3a and Figure 3b yes Figure 1 A schematic diagram of the internal structure of the nail gun in the initial position;

[0020] Figure 4 yes Figure 1A schematic diagram of the internal structure of the nail gun in the firing position;

[0021] Figure 5 yes Figure 2 A schematic diagram of the power output structure of the nail gun;

[0022] Figure 6 yes Figure 2 A three-dimensional schematic diagram of a driving wheel of a nail gun;

[0023] Figure 7 yes Figure 2 An exploded view of part of the internal structure of the nail gun;

[0024] Figure 8 yes Figure 2 A schematic structural diagram of a first anti-return member of a nail gun;

[0025] Fig. 9 yes Figure 2 An exploded view of the reverse latch of the nail gun;

[0026] Fig.10 yes Figure 2 Schematic diagram of the structure of the firing pin of the nail gun. DETAILED DESCRIPTION

[0027] Figure 1 to Figure 2The nail gun 100 shown includes: a housing 11, a power output unit 12, a cylinder 13, a clip assembly 14, a battery pack 15, a firing assembly 16, a first check member 17, and a second check member 18. The housing 11 includes a first accommodating space 111 extending along the direction of the first straight line 101 and a second accommodating space 112 extending along the direction of the second straight line 102. The power output unit 12 is arranged in the first accommodating space 111, and the cylinder 13 is arranged in the second accommodating space 112. The housing 11 is also formed with a handle 113 for the user to hold. One end of the handle 113 is connected to a power interface for connecting to a DC power supply or an AC power supply. A main switch 113a is provided on the handle 113, and the user controls the start and stop of the nail gun 100 through the main switch 113a. In this embodiment, the power interface is connected to the battery pack 15. The other end of the handle 113 is connected to the cylinder 13, and the cylinder 13 extends in the direction of the second straight line 102, and the first straight line 101 and the second straight line 102 are perpendicular to each other. The clip assembly 14 is arranged in the direction of the third straight line 103 parallel to the first straight line 101. As an optional embodiment, the clip assembly 14 is also provided with a window 141 for the user to observe the remaining nails. The window 141 is set as one or more notches on the clip assembly 14, which can allow the user to check the remaining nails on the one hand, and can also allow the user to perform simple maintenance on the clip assembly 14 without disassembling the clip assembly 14 on the other hand. A firing assembly 16 is arranged in the cylinder 13, and the gas in the cylinder 13 does work to push the firing assembly 16 to move and drive out the nails. In this embodiment, the cylinder 13 also includes an inflation nozzle for pre-filling gas in the cylinder 13. The power output part 12 drives the firing assembly 16 to compress the gas and move from the initial position to the firing position. At this time, the gas does work, and under the action of the pre-filled gas, it continuously pushes the firing assembly 16 to give it an acceleration, so that the firing assembly 16 drives the nail with greater kinetic energy, and after driving the nail, it quickly moves from the firing position to the initial position, thereby completing a nailing cycle.

[0028] At the end of a nailing cycle, the firing assembly 16 is located at the initial position or near the initial position, and the first check piece 17 can lock the firing assembly 16 at or near the initial position. Thus, the firing assembly 16 can be prevented from moving from the initial position to the firing position when the nail is not being driven. In the present application, the second check piece 18 can cooperate with the first check piece 17 to complete the locking or unlocking of the firing assembly 16. The specific implementation process will be described in detail below.

[0029] like Figure 3a-Figure 4 As shown, the output shaft 123 of the power output unit 12 extends substantially along the first straight line 101, and the cylinder 13 and the firing assembly 16 disposed in the cylinder 13 extend substantially along the second straight line 102. The output shaft 123 and the cylinder 13 are substantially vertically disposed. Figure 4The states of the firing pin 161 at the initial position and the firing position, and the corresponding rotation state of the driving force 124 are respectively shown.

[0030] Specifically, Figure 5 As shown, the power output unit 12 at least includes: a motor 121, a gearbox 122, and an output shaft 123. The motor 121 can output a power to the gearbox 122, and after the gearbox 122 changes speed, it continues to output a power to the output shaft 123. The driving wheel 124 and the second check member 18 are arranged on the output shaft 123. The firing assembly 16 includes a firing pin 161 and a piston (not shown). The piston is fixedly connected to the firing pin 161. Fig.10 As shown, a transmission tooth 161a is formed on one side of the striker 161, and a check tooth 161b is formed on the other side. The piston and the striker 161 can move in the cylinder 13 along the direction of the second straight line 102. The driving wheel 124 can cooperate with the transmission tooth 161a to drive the firing assembly 16 to overcome the air pressure in the cylinder 13 to do work, so that the firing assembly 16 can enter the firing position. The check tooth 162b can cooperate with the first check member 17 to lock the striker 161 in the initial position or near the initial position. Specifically, the motor 121, the gearbox 122, the output shaft 123, the second check member 18 and the driving wheel 124 are all distributed along the direction of the first straight line 101.

[0031] As shown in Figure 3- Figure 7As shown, the driving wheel 124 is a gear structure. The driving wheel 124 is also formed with a second connecting hole 124a for connecting the output shaft 123. The second connecting hole 124a is specifically a flat hole. When the output shaft 123 is connected to the second connecting hole 124a, the driving wheel 124 can rotate synchronously with the output shaft 123. A plurality of driving teeth 124g are formed around the main body of the driving wheel 124, and the driving teeth 124g include a first tooth 124b arranged at the starting end and a second tooth 124d arranged at the end. Here, the driving tooth 124g that first starts to contact with the firing pin 161 in the firing assembly 16 when the driving wheel 124 starts to drive the firing assembly 16 to reset to the initial position is defined as the first tooth 124b, and the driving tooth 124g that is already in the initial position and is lastly meshed with the firing pin 161 in the firing assembly 16 is defined as the second tooth 124d. The first section 124e and the second section 124f are included between the first tooth 124b and the second tooth 124d. The first section 124e is evenly distributed with a plurality of driving teeth 124g; the second section 124f is smooth and continuous, and is not distributed with driving teeth 124g. When the driving teeth 124g of the first section 124e are engaged with the transmission teeth 161a on the striker 161, the driving wheel 124 can drive the striker 161 to compress the gas in the cylinder 13 to do work; when the second section 124f cooperates with the striker 161, since the second section 124f is smooth and continuous, the striker 161 will be quickly pushed out by the gas in the cylinder 13 without the stop of the driving teeth 124g, thereby achieving a nailing effect.

[0032] In this embodiment, if Figure 2 , 3 and Figure 7 As shown, the second check member 18 is coaxially connected to the driving wheel 124 and both are arranged on the output shaft 123. Optionally, the output end of the output shaft 123 is connected to the second check member 18 and the driving wheel 124 in sequence.

[0033] In one implementation, the second check member 18 is a cam, and the cam 18 has a protruding portion 181 and a non-protruding portion 182. The connection between the protruding portion 181 and the non-protruding portion 182 is smooth and continuous. The protruding portion 181 corresponds to the second section 124f of the driving wheel 124 in the axial direction of the output shaft 123. The non-protruding portion 182 corresponds to the first section 124e of the driving wheel 124 in the axial direction of the output shaft 123. The second check member 18 and the driving wheel 124 rotate with the rotation of the output shaft 123.

[0034] like Figure 8 and Fig. 9As shown in FIG. 1 (latch), the first check member 17 includes a locking portion 171, a follower 172 and an elastic member 173. Among them, the locking portion 171 locks the firing assembly 16 when the firing assembly 16 is at the initial position or near the initial position. It can be understood that when the firing assembly 16 is at the initial position or near the initial position, the second tooth 124d of the driving wheel 124 locks the position of the striker 161 so that it cannot fall, and the first check member 17 is mainly to prevent the striker 161 from slipping when the locking effect of the driving wheel 124 fails. Therefore, it can be considered that the first check member 17 assists the driving wheel 124 in locking the striker 161. Further, when the firing assembly 16 is in the locked state and the driving wheel 124 continues to rotate, the second section 124f of the driving wheel 124 does not contact the firing pin 161, and because the follower 172 is connected to the locking portion 171, the follower 171 can be pushed by the protrusion 181 of the second check member 18, thereby driving the locking portion 172 away from the firing pin 161 to cooperate with the driving wheel 124 to unlock the firing assembly 16, so that the firing assembly 16 can fire the nail from the initial position. Further, the elastic member 173 is connected to the locking portion 171, and when the locking portion 172 is pushed by the follower 172 to unlock the firing assembly 16, the elastic member 173 is in a compressed state. Therefore, when the thrust of the follower 172 on the locking portion 171 disappears, the elastic member 173 is released from the compressed state, and can push the locking portion 171 to contact the firing pin 161 again.

[0035] In one embodiment, the locking portion 171 is Fig. 9 The integrally formed special-shaped structure shown has a protruding boss 171a that is in direct contact with the firing assembly 16, a columnar connecting portion 171b and a connecting portion 171c. The follower 172 and the elastic member 173 are respectively fixed on both sides of the end of the connecting portion 171c. The thrust applied by the follower 172 to the locking portion 171 is in the opposite direction to the elastic force applied by the elastic member 173 to the locking portion 171. Optionally, the follower 171 can be a columnar latch, and the elastic member 173 can be an elastic member such as a spring or an elastic sheet.

[0036] Optionally, one end of the follower 172 away from the connecting portion 171c may be provided with a contact piece 172a having a smooth and continuous surface. The contact piece 172a may be a metal sphere. The contact piece 172a may be connected to the follower 172 through the port 172b.

[0037] It can be understood that during the rotation of the output shaft 123, when the second section 124f cooperates with the firing pin 161, the protrusion 181 of the second check member 18 contacts the follower 172, which can push the follower 172 to move, so that the locking portion 171 is pushed away and no longer contacts the firing pin 161, and can cooperate with the driving wheel 124 to unlock the firing assembly 16. Since the second section 124f is smooth and continuous, the firing pin 161 will be quickly pushed out by the gas in the cylinder 13 without the driving tooth 124g and the locking portion 171 to achieve the nailing effect. When the driving tooth 124g of the first section 124e meshes with the transmission tooth 161a on the striker 161, the non-protruding portion 182 no longer contacts the follower 172, and the elastic member 173 is released from the compressed state, which can push the locking portion 171 to contact the striker 161 again, so that after the striker 161 is driven by the driving tooth 124g on the first section 124e of the driving wheel 124 to move upward to the initial position, the locking portion 171 contacts the striker 161 and is located at the lower side of the check tooth 161b. In the process of the striker 161 moving upward from the firing position, the driving force of the driving wheel 124 to drive the transmission tooth 161a to rotate is greater than the elastic force applied to the locking portion 171 by the elastic member 173. Therefore, even if the locking portion 171 has a certain resistance to the check tooth 161b on the striker 161, the driving wheel 124 can drive the striker 161 to move upward.

[0038] In an optional implementation, in the process of the firing pin 161 moving upward from the firing position, in order to minimize the resistance of the locking portion 171 to the anti-return tooth 161b, the anti-return tooth 161b can be designed as a ratchet, and the tip of the ratchet tooth faces downward, which can ensure that when the locking portion 171 is located above the anti-return tooth 161b during the upward movement of the firing pin 161, the firing pin 161 can easily slide over, and when the locking portion 171 is located below the anti-return tooth 161b, it can lock the firing pin 161 so that it cannot slide down.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A nail gun, comprising: The housing is formed with a receiving space; a gas cylinder connected to the housing and used to store gas; a firing assembly, at least partially disposed in the cylinder, capable of moving from an initial position to a firing position in the cylinder to drive a nail; A power output part, disposed in the accommodation space formed by the housing, for outputting a driving force to drive the firing assembly to move in the cylinder; A driving wheel connected to the output shaft of the power output part, and used to drive the firing assembly to move in the cylinder under the drive of the power output part; A first anti-return member, used to prevent the firing assembly from moving from the initial position to the firing position; Also includes: A second anti-return member is coaxially connected to the output shaft with the driving wheel and is used to cooperate with the first anti-return member to block the firing assembly from moving from the initial position to the firing position; The second anti-return member is a cam; The cam has a protruding portion and a non-protruding portion; The driving wheel comprises a first section with a plurality of driving teeth evenly distributed therein and a smooth and continuous second section; The protruding portion of the cam corresponds to the second section of the driving wheel in the axial direction of the output shaft; The non-protruding portion of the cam corresponds to the first section of the driving wheel in the axial direction of the output shaft.

2. The nail gun according to claim 1, characterized in that: The junction between the protruding portion of the cam and the non-protruding portion is a continuous and smooth curved surface or plane.

3. The nail gun according to claim 1, characterized in that: The first anti-return member comprises: a locking portion, for locking the firing assembly when the firing assembly is located at or near the initial position; A follower, which can be pushed by the protruding portion of the cam to drive the locking portion to unlock the firing assembly, so that the firing assembly can move from the initial position to the firing position to complete the firing action; The elastic member is connected to the locking portion and can push the locking portion to lock the firing assembly.

4. The nail gun according to claim 3, characterized in that: The thrust force applied by the follower to the locking portion is in the opposite direction to the elastic force applied by the elastic member to the locking portion.

5. The nail gun according to claim 3, characterized in that: The elastic member includes a spring or a spring sheet.

6. The nail gun according to claim 3, characterized in that: The driven member is a latch structure.

7. The nail gun according to claim 1, characterized in that: The firing assembly comprises: a piston, located in the cylinder; a striker, fixed on the piston; One side of the striker is provided with a plurality of transmission teeth, and the other side is provided with a check tooth.

8. The nail gun according to claim 7, characterized in that: The anti-reverse teeth are ratchet teeth; The tooth tip of the ratchet faces the firing position.

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