TWI389776B - Nail gun nail back pressure relief device - Google Patents

Description

Nail gun nail back pressure relief device

The invention provides a nail gun back pressure release device, in particular to a pneumatic nail gun with a return air chamber, and a bottom valve capable of sensing the action state of the trigger valve, and controlling the high pressure air to drive the bottom The valve vents the driving air path of the back pressure of the nail.

The pneumatic nail gun is a hand tool that drives the nailing operation with high-pressure air as a power source. Generally speaking, the gun body is provided with a pushable safety slider for controlling the nailing operation sequence, and the gun body is provided with a plurality of main air chambers, a cylinder and a sliding group which can continuously collect high pressure air to maintain a constant pressure. a piston in the cylinder, a striking rod integrally coupled to a bottom end of the piston, a trigger for driving a strut rod, and a trigger valve; wherein the piston partitions the cylinder into a top cylinder chamber and a The bottom cylinder chamber communicates with a plurality of upper exhaust outlets of the gun body, and the bottom cylinder chamber communicates with a plurality of lower exhaust outlets of the gun body. The user can push the safety slider on the object to be nailed, and press the trigger to touch the trigger valve to switch the driving air path of the high-pressure air in the gun body, so that the high-pressure air enters the top cylinder chamber through the driving air passage. The driving piston advances the nailing rod to move the nailing member down. The user then releases the safety slider and the trigger to switch the drive air path to reset the piston and the hammer bar up.

In the prior art in which the above-mentioned driving nailing rod is moved up and down, for example, the U.S. Patent No. 5,911,351 patent discloses disposing a gas chamber (or a return air chamber) having a predetermined volume at the periphery of the cylinder, and collecting the piston downward movement process in the cylinder. The finite volume of high-pressure air introduced through the top cylinder chamber is divided, and the return air chamber also collects the residual gas introduced through the bottom cylinder chamber during the downward movement of the piston, so that when the user releases the trigger, the guide is guided. The returning air chamber has a limited volume of high-pressure air to the bottom cylinder chamber as a power source for driving the piston and the nail rod to move up and down; but the disadvantage is that the back stroke is utilized during the movement of the nail under the piston pushing nail rod. The manner in which the gas chamber collects the residual gas in the bottom cylinder chamber will cause a back pressure phenomenon in the bottom cylinder chamber to block the downward movement of the piston. Since the return air chamber also collects the high pressure air that is split from the top cylinder chamber, the number of the high pressure air is increased. The strength of the back pressure in the bottom cylinder chamber is inevitably consumed or offset by the kinetic energy of the piston pushing the nail under the nail. User operating the nail gun impact efficiency for continuous action when problems hit the nail and smooth nature.

In order to overcome the problems caused by the above-mentioned nail back pressure, for example, in the U.S. Patent No. 4,030,655, the use of a bottom valve arrangement in the periphery of the cylinder is disclosed, and the main air path and the return air chamber high pressure air control are controlled by a single main air chamber. The bottom valve is actuated, and the open bottom cylinder chamber is connected to the outside atmosphere via the lower exhaust outlet to release the back pressure generated in the bottom cylinder chamber, and the bottom valve can be accepted in a state in which the trigger valve is released after the nail is pressed. The return air chamber is driven, and the high-pressure air accumulated in the return gas chamber is led to the bottom cylinder chamber to drive the piston up and reset; but the disadvantage is that the bottom valve also opens the lower exhaust outlet when the valve is not pressed, so that Therefore, the dust in the outside air can accumulate at any time through the lower exhaust outlet into the air cylinders of the bottom cylinder chamber and the gun body. After long-term use, the air passage is blocked and the components are worn, which will affect the operation of the nail gun. Efficiency and smoothness; in addition, during the return air chamber high pressure air to the bottom cylinder chamber, the pressure of the high pressure air in the return air chamber drives the bottom valve, along with the high pressure air Entering the bottom cylinder chamber and gradually weakening, causing the bottom valve to close the air path between the return air chamber and the bottom cylinder chamber in the condition that the high pressure air in the return air chamber has not been completely introduced into the bottom cylinder chamber, causing the nail rod to be reset. The problem of poor efficiency and smoothness is more serious in the case of continuous nailing.

In addition, in the prior art, the push-up bar resetting technique of the driving nail is disclosed, for example, the domestic invention No. I317679 discloses the configuration of using the bottom valve and the driving air path in the periphery of the cylinder, and connecting the driving gas path. Between the main air chamber and the bottom cylinder chamber, and controlling the pressure difference between the top and the bottom of the bottom valve, and continuously supplying high-pressure air in the process of moving up and resetting the piston and the nail rod In the bottom cylinder chamber, the driving piston and the nailing rod are quickly moved up and reset; at the same time, the gas in the bottom cylinder chamber can be led to the outside atmosphere via the lower exhaust outlet to avoid back pressure in the bottom cylinder chamber and block the piston. The situation of moving down. However, the above-mentioned method of using the bottom valve to guide the high-pressure air driving piston and the ejector rod up and down in the main air chamber is difficult to apply to the above-mentioned pneumatic nail gun equipped with the return air chamber, and does not have the venting of the bottom cylinder chamber. The ability to back pressure, so it needs to be improved.

The object of the present invention is to improve the following problems in the prior art:

1. The return air chamber collects the high-pressure air shunted from the top cylinder chamber while the piston pushes the nail rod downward, and collects the remaining gas in the bottom cylinder chamber, thereby causing the back cylinder to move back in the bottom cylinder chamber. The pressure condition consumes or detracts from the kinetic energy of the piston pushing the nail under the nail and affects the efficiency and smoothness of the user when the nail is continuously hammered.

2. The lower exhaust outlet is opened in the state of the unpressed trigger valve, so that the dust in the outside air can accumulate at any time through the lower exhaust outlet into the respective cylinders of the bottom cylinder chamber and the gun body, and the air passage is blocked and The wear condition of the component affects the efficiency and smoothness of the operation of the nail gun.

3. Using a single main air circuit and a return air chamber to control the high pressure air in the indoor air chamber, and in the process of returning the high pressure air in the air chamber to the bottom cylinder chamber, the high pressure air in the return air chamber drives the pressure of the bottom valve, along with the high pressure air. Entering the bottom cylinder chamber and gradually weakening, causing the bottom valve to close the air path between the return air chamber and the bottom cylinder chamber in the condition that the high pressure air in the return air chamber has not been completely introduced into the bottom cylinder chamber, causing the nail rod to be reset. The problem of poor efficiency and smoothness.

In order to achieve the above object, the specific technical means of the nail gun back pressure relief device of the present invention comprises a main air chamber, a cylinder, a return air chamber, a lower exhaust outlet, a bottom cylinder chamber and a The trigger valve and the valve body of the valve stem thereof comprise: a bottom valve disposed on a peripheral edge of the outer periphery of the cylinder; a main air passage formed on a periphery of the cylinder and communicating with the main air chamber to guide high-pressure air driving The bottom valve; and a valve control air passage formed on the periphery of the cylinder and communicating with the main air chamber via the trigger valve, and guiding the high pressure air to drive the bottom valve; wherein: the bottom valve is defined to receive the valve control air passage The driving force of the internal high-pressure air is greater than the high-pressure air in the main air path, and the bottom valve guides the high-pressure air in the return air chamber to the bottom cylinder chamber under the condition that the trigger valve stem is removed. When the valve stem is triggered, the bottom valve guides the gas in the bottom cylinder chamber to the lower exhaust outlet.

According to the above, the main gas path and the valve control gas path are used together to control the bottom valve actuation, so as to accurately control the timing of the bottom cylinder chamber connecting the return air chamber and the timing of the bottom cylinder chamber connecting to the outside atmosphere to vent The nail gun generates back pressure in the bottom cylinder chamber during the nailing process, and does not affect the kinetic energy of the high-pressure air driving piston in the cylinder to push the nail under the nail, thereby improving the efficiency and smooth operation of the nail gun during continuous nailing. At the same time, the lower exhaust outlet can be controlled to be opened in the state of the buckle trigger valve to prevent the dust in the outside air from entering the gun body through the lower exhaust outlet at any time, and causing the air passage to block and the member to wear. Wherein the high pressure air in the main air passage drives the bottom valve to move to a first position that can guide the gas in the bottom cylinder chamber to the lower exhaust outlet, and the high pressure air in the valve control air passage drives the bottom valve to move a second position that can guide the high pressure air in the return air chamber to the bottom cylinder chamber; a bottom pressure collecting chamber connecting the valve control air passage is formed between the bottom valve and the inner wall of the gun body, and a main connecting chamber is connected a bottom layer collecting chamber of the gas path, the top collecting chamber can accumulate high-pressure air introduced by the valve-controlled gas path to drive the bottom valve, and the bottom collecting chamber can accumulate high-pressure air introduced by the main gas path to drive The bottom valve; the bottom wall of the bottom valve forms a top surface that can be driven by the high pressure air in the valve control air passage, and a bottom surface that can be driven by the high pressure air in the main air passage, the bottom valve accepting the valve with the top surface The high pressure air is driven in the air control passage, and the bottom valve is driven by the high pressure air in the main air passage with the bottom surface; the bottom valve is driven by the high pressure air in the valve controlled air passage when the trigger valve stem is removed. When the trigger valve stem is buckled, the valve is vented The high pressure air passage, the bottom of the receiving valve driving the high pressure air to the main air passage. Alternatively, the high pressure air in the valve control air passage drives the bottom valve to move to a first position that can direct the gas in the bottom cylinder chamber to the lower exhaust outlet, and the high pressure air in the main air passage drives the bottom valve to move a second position that can guide the high pressure air in the return air chamber to the bottom cylinder chamber; a bottom pressure collecting chamber connecting the valve control air passage is formed between the bottom valve and the inner wall of the gun body, and a main connecting chamber is connected a top collecting chamber of the gas path, wherein the bottom collecting chamber can accumulate high-pressure air introduced by the valve-controlled gas passage to drive the bottom valve, and the top collecting chamber can accumulate high-pressure air introduced by the main gas passage to drive The bottom valve; the bottom wall of the bottom valve forms a bottom surface that can be driven by the high-pressure air in the valve-controlled air passage, and a top surface that can be driven by the high-pressure air in the main air passage, and the bottom valve receives the valve control along with the bottom surface The high pressure air is driven in the air passage, and the bottom valve is driven by the high pressure air in the main air passage with the top surface; the bottom valve is driven by the high pressure air in the main air passage when the trigger valve stem is removed. Guiding the main air chamber when the trigger valve stem is crimped Valve high pressure air enters the air passage, the inside of the bottom of the valve-controlled valve receiving the high pressure air drives the gas passage.

The specific technical means of the nail gun back pressure relief device of the present invention comprises: a main air chamber, a cylinder, a return air chamber, a lower exhaust outlet, a bottom cylinder chamber and a trigger valve and The gun body of the valve stem comprises: a main gas path formed on the periphery of the cylinder and communicating with the main air chamber to introduce high-pressure air to generate a collecting pressure; and a valve-controlled gas path formed on the periphery of the cylinder And connecting the main air chamber through the trigger valve to introduce high-pressure air to generate a pressure collecting function, and when the trigger valve stem is buckled, the high-pressure air of the valve-controlled air passage is vented to generate a pressure reducing effect; a chamber is formed between the bottom edge of the outer periphery of the cylinder and the inner wall of the gun, the return air chamber communicates with the top end of the valve chamber, the bottom cylinder chamber and the lower exhaust outlet communicate with the bottom end of the valve chamber; and a bottom valve, active Nested on the outer bottom edge of the cylinder and slidably disposed in the valve chamber, and the bottom valve divides the valve chamber into a top pressure collecting chamber that communicates with the valve control air passage, and a bottom layer assembly that communicates with the main air passage Pressure chamber, the top pressure collecting chamber accumulates the valve control gas passage Pressurizing air to drive the bottom valve to move to a second position that can guide the high pressure air in the return air chamber to the bottom cylinder chamber, and the bottom pressure collecting chamber accumulates the high pressure air introduced by the main air passage. When the trigger valve stem vents the high pressure air in the valve control passage, the bottom valve is driven to move to a first position that can guide the gas in the bottom cylinder chamber to the lower exhaust outlet.

According to the above, the back pressure generated in the bottom cylinder chamber during the nailing process is eliminated, thereby improving the kinetic energy, efficiency and smoothness of the nail gun. Wherein, the outer wall of the bottom valve forms a top surface which can be exposed in the top collecting chamber, and a bottom surface which can be exposed in the bottom collecting chamber, and the bottom valve is driven by the top surface to receive high pressure air in the top collecting chamber to The second position, and the bottom valve is driven to the first position by the bottom surface receiving the high pressure air in the bottom collection chamber; the bottom valve is driven by the high pressure air in the valve control passage to be greater than the main air passage High pressure air.

The specific technical means of the nail gun back pressure relief device of the present invention comprises: a main air chamber, a cylinder, a return air chamber, a lower exhaust outlet, a bottom cylinder chamber and a trigger valve and The gun body of the valve stem comprises: a main gas path formed on the periphery of the cylinder and communicating with the main air chamber to introduce high-pressure air to generate a collecting pressure; and a valve-controlled gas path formed on the periphery of the cylinder And connecting the main air chamber via the trigger valve, and when the trigger valve stem is buckled, the high pressure air of the main air chamber is introduced to generate a collecting force; a valve chamber is formed at a bottom edge of the cylinder and the gun Between the inner wall, the return air chamber communicates with the top of the valve chamber, the bottom cylinder chamber and the lower exhaust outlet communicate with the bottom end of the valve chamber; and a bottom valve is sleeved on the bottom edge of the cylinder and is slidably disposed In the valve chamber, the bottom valve partitions the valve chamber into a top pressure collecting chamber that communicates with the main gas path, and a bottom layer collecting chamber that communicates with the valve control gas path, and the top collecting chamber accumulates the main gas High pressure air introduced into the road to drive the bottom valve to move to a guide The returning high pressure air in the air chamber leads to the second position of the bottom cylinder chamber. When the trigger valve stem is pressed to introduce the high pressure air into the valve control air passage, the bottom pressure collecting chamber accumulates the high pressure air introduced by the valve control air passage. And driving the bottom valve to move to a first position that can guide the gas in the bottom cylinder chamber to the lower exhaust outlet.

According to the above, the back pressure generated in the bottom cylinder chamber during the nailing process is eliminated, thereby improving the kinetic energy, efficiency and smoothness of the nail gun. Wherein, the outer wall of the bottom valve forms a top surface which can be exposed in the top collecting chamber, and a bottom surface which can be exposed in the bottom collecting chamber, and the bottom valve is driven by the top surface to receive high pressure air in the top collecting chamber to The second position, and the bottom valve is driven to the first position by the bottom surface receiving the high pressure air in the bottom collection chamber; the bottom valve is driven by the high pressure air in the valve control passage to be greater than the main air passage High pressure air.

In addition, the present invention also includes: an intake valve port is formed between the inner wall of the bottom valve and the outer wall of the cylinder, and the return air chamber is controlled to the bottom cylinder chamber, and the bottom of the bottom valve and the inner wall of the gun are formed. An exhaust valve port controls the bottom cylinder chamber to the lower exhaust outlet, the bottom valve moves down to close the exhaust valve port, and opens the intake valve port, the bottom valve moves up to close the intake air Valve port and open the exhaust valve port.

However, in order to clearly and fully disclose the present invention, please refer to the following description of the embodiments and the drawings:

FIG. 1 is a cross-sectional view showing the configuration of the nail gun of the present invention, which is disposed in a gun body 1 of the nail gun. A fixed cylinder 2 is disposed in the body 1, and a piston 21 is slidably disposed in the cylinder 2, and a hammer rod 22 is coupled to the bottom end of the piston 21. The piston 21 divides the interior of the cylinder 2 into a top cylinder chamber 23 and an underlying cylinder. a chamber 24; a main air chamber 10 in which a plurality of high-pressure air communicating with each other is formed inside the gun body 1, and is distributed between the periphery of the cylinder 2 in the gun body 1 and a grip portion 11 to gather the tail end of the grip portion 11 for continued The introduced high-pressure air; a periphery of the cylinder 2 in the gun body 1 and a return air chamber 12 is formed under the main air chamber 10, and an outer wall surface of the middle portion of the cylinder 2 is formed with a plurality of interconnecting cylinders 2 and the return path. The upper air guiding hole 25 of the air chamber 12, and the outer wall surface of the middle portion of the air cylinder 2 is provided with a one-way choke valve ring 26 covering the upper air guiding hole 25, and the outer wall surface of the bottom end of the cylinder 2 is formed with a plurality of lower air guiding holes 27 communicating with the bottom cylinder chamber 24; during the downward movement of the piston 21 in the cylinder 2 ( As shown in FIG. 7 , the one-way choke valve ring 26 can open the high pressure air in the top cylinder chamber 23 and be introduced into the return air chamber 12 through the upper air guiding hole 25, and the one-way choke valve ring 26 can be The high-pressure air in the return air chamber 12 is inserted into the interior of the cylinder 2 through the upper air guiding hole 25; the trigger body 3 of the main air chamber 10 is disposed at a position of the gun body 1 adjacent to the grip portion 11, and the gun body 1 One side of the outer wall slides a safety slider 4, and a valve 5 is disposed on the top of the cylinder 2.

A collecting chamber 51 (shown in FIG. 1) is formed between the top inner wall of the gun body 1 and the head valve 5, and a trigger air passage 13 connecting the pressure collecting chamber 51 is formed inside the gun body 1. The bottom of the head valve 5 is A main air valve port 50 (shown in FIG. 6) connecting the main air chamber 10 and the top cylinder chamber 23 is formed between the tops of the cylinders 2; a communication top layer is formed between the inside of the head valve 5 and the top inner wall of the gun body 1. The cylinder chamber 23 and the upper exhaust outlet 52 of the outside atmosphere, the bottom of the gun body 1 forms a lower exhaust outlet 14 communicating with the bottom cylinder chamber 24, the lower air guiding hole 27 and the outside atmosphere; the trigger valve 3 has a valve body 30, a valve stem 31 and a valve sleeve 32, the valve stem 31 is slidably disposed in the valve body 30, and the valve sleeve 32 is sleeved on the valve stem 31 and slidably disposed between the valve body 30 and the valve stem 31, and A trigger 33 is pivoted on one side of the gun body 1 to press and release the valve stem 31 by the trigger 33, and an intake passage connecting the main air chamber 10 and the trigger air passage 13 is formed between the valve body 30 and the valve sleeve 32. 301, and an exhaust passage 302 (shown in FIG. 6) that connects the trigger air passage 13 with the outside atmosphere.

In this embodiment, the trigger valve 3 can supply the high pressure air in the main air chamber 10 to the trigger air passage 13 and the pressure collecting chamber 51 via the intake passage 301 (as shown in FIG. 1) to drive the head valve 5 The main air valve port 50 is closed and the upper exhaust gas outlet 52 is opened; the trigger valve 3 can also vent the high pressure air in the trigger air passage 13 and the pressure collecting chamber 51 via the exhaust passage 302 (as shown in FIG. 6). The high-pressure air driving head valve 5 in the main air chamber 10 at the periphery of the cylinder 2 is moved up to close the upper exhaust outlet 52, and the main air valve port 50 is opened at the same time, so that the high-pressure air in the main air chamber 10 passes through the main air valve port. 50 enters the top cylinder chamber 23 and drives the piston 21 to advance the nail rod 22 downward to move the nail.

However, the fixed cylinder 2, the trigger valve 3, the safety slider 4 and the head valve 5 of the nail gun are only a preferred embodiment, and the invention is not limited thereby; in other words, other fixings are used. The cylinder, the trigger valve, the safety slider and the nail gun for controlling the nailing of the head valve can be utilized by the present invention.

According to the above, the present invention is provided in the gun body 1 including a main air passage 15, a valve control air passage 16, an annular valve chamber 17, and an annular bottom valve 6 (see Figs. 1 to 3). The main air passage 15 is formed on the periphery of the cylinder 2 and communicates with the main air chamber 10 to introduce high-pressure air to generate a collecting force; the valve-controlled air passage 16 is formed on the periphery of the cylinder 2 And connecting the main air chamber 10 via the trigger valve 3, and when the trigger 33 is not buckled, the high pressure air in the main air chamber 10 is guided to the valve control air passage 16 through the intake passage 301 of the trigger valve 3. The pressure is generated, and when the trigger 33 is pressed, the high pressure air in the valve control air passage 16 is vented to the outside atmosphere (as shown in FIG. 6) by the exhaust passage 302 of the trigger valve 3 to generate a drop. The valve chamber 17 is formed between the outer bottom edge of the cylinder 2 and the inner wall of the bottom end of the gun body 1 (as shown in FIG. 3), and the return air chamber 12 communicates with the top end of the valve chamber 17, the lower row The gas outlet 14 communicates with the bottom end of the valve chamber 17, and the bottom cylinder chamber 24 communicates with the bottom end of the valve chamber 17 via the lower pilot hole 27.

The bottom valve 6 is sleeved on the outer bottom edge of the cylinder 2 (as shown in FIG. 1 and FIG. 2), and is slidably disposed in the valve chamber 17, and has a bottom valve 6 in the valve chamber 17. Moving to the positioned first position 173 (shown in Figure 5), and a bottom valve 6 is moved down to the positioned second position 174 (shown in Figure 4), and the bottom valve 6 separates the valve chamber 17 into a top pressure collecting chamber 171 connecting the valve control air passage 16, and a bottom layer collecting chamber 172 communicating with the main air passage 15; in this embodiment, the outer wall of the bottom valve 6 forms a convex ring 61, and the top end of the bottom valve 6 A first air lock ring 71 is disposed between the outer wall and the inner wall of the gun body 1. a second air lock ring 72 is disposed between the outer periphery of the convex ring 61 and the inner wall of the gun body 1, and the outer wall of the bottom end of the bottom valve 6 is A third air lock ring 73 is disposed between the inner wall of the gun body 1 , and the top layer is separated from the outer wall of the bottom valve 6 and the inner wall of the gun body 1 by the first air lock ring 71 and the second air lock ring 72 . a pressure collecting chamber 171, and the bottom gas collecting chamber 172 is partitioned between the outer wall of the bottom valve 6 and the inner wall of the gun body 1 by the second gas stopping ring 72 and the third gas stopping ring 73; the top of the convex ring 61 is formed a top surface 62 that is exposed in the top layer plenum 171, and a bottom portion of the convex ring 61 is formed The bottom surface 63 of the bottom layer collecting chamber 172 is exposed, and the area of the top surface 62 is larger than the area of the bottom surface 63, thereby limiting the force of the bottom valve 6 to be driven by the high-pressure air in the valve-controlled air passage 16 to be greater than The high pressure air in the main air passage 15; thus, in the state of eliminating the trigger 3 of the trigger 3 valve stem 31, the bottom valve 6 can receive the high pressure air introduced into the top pressure collecting chamber 171 from the top surface 62 with the valve control air passage 16 Driving down, and moving down to the second position 174; when the valve stem 31 of the trigger 3 is vented and the high pressure air in the valve control air passage 16 is vented (shown in FIG. 6), the bottom valve 6 can also follow the bottom surface 63. The high-pressure air introduced into the bottom collection chamber 172, which is received by the main gas path 15, is driven from the bottom to the top, and is moved up to the first position 173.

A return air path 66 (shown in FIG. 4) connecting the return air chamber 12 and the bottom cylinder chamber 24 is formed in the valve chamber 17 between the inner wall of the bottom valve 6 and the outer wall of the bottom end of the cylinder 2, and the bottom valve 6 is An air inlet valve port 64 is formed on the return air path 66 between the wall and the outer wall of the bottom end of the cylinder 2 to control the return air chamber 12 to the bottom cylinder chamber 24; the bottom of the bottom valve 6 and the bottom inner wall of the gun body 1 An exhaust gas passage 67 (shown in FIG. 5) is formed in the valve chamber 17, and an exhaust valve port 65 is formed on the exhaust gas passage 67 between the bottom of the bottom valve 6 and the inner wall of the bottom of the gun body 1. The bottom cylinder chamber 24 leads to the lower exhaust outlet 14 via the lower air guiding hole 27; in the present embodiment, the intake valve port 64 is located above the lower air guiding hole 27, and the cylinder above the intake valve port 64 2 The outer wall is sleeved with a fourth air stop ring 74. The bottom end of the cylinder 2 is provided with a cushion 18, and the inner wall of the bottom of the gun body 1 at the periphery of the cushion 18 is formed with a ring groove 19 for the bottom of the bottom valve 6. Located at the opposite end of the bottom of the bottom valve 6; thus, when the bottom valve 6 is moved down to the second position 174, the bottom of the bottom valve 6 can be implanted into the annular groove 19 and the outer wall of the cushion 18 To close the exhaust valve port 65 and the exhaust gas passage 67, and the fourth air lock ring 74 can be separated from the intake valve port 64 to open the intake valve port 64 and the return air passage 66 to guide the return air chamber 12 The inner high pressure air leads to the bottom cylinder chamber 24; when the bottom valve 6 moves to the first position 173, the fourth air lock ring 74 can be implanted into the intake valve port 64 to close the intake valve port 64 and a return air path 66, and the bottom of the bottom valve 6 can be separated from the annular groove 19 and the outer wall of the cushion 18 to open the exhaust valve port 65 and the exhaust gas path 67, and guide the gas in the bottom cylinder chamber 24 to the Lower exhaust outlet 14.

According to the above component composition, it is possible to implement the present invention, particularly when the user does not push the safety slider 4 up and does not press the trigger 33 (as shown in FIG. 1), the high pressure in the main air chamber 10. The air drives the valve sleeve 32 to open the intake passage 301 while closing the exhaust passage 302; thus, the high-pressure air in the main air chamber 10 enters the pressure accumulated in the pressure collecting chamber 51 via the intake passage 301 and the trigger air passage 13, and drives The head valve 5 is moved downward to open the upper exhaust outlet 52 and close the main air valve port 50; at the same time, the high pressure air in the main air chamber 10 is also introduced into the bottom collecting chamber 172 via the main air passage 15 to accumulate pressure (cooperating diagram) 2 and FIG. 4), the high-pressure air in the main air chamber 10 enters the pressure accumulated in the top-layer pressure collecting chamber 171 via the intake passage 301 and the valve-controlled air passage 16, since the area of the top surface 62 of the bottom valve 6 is larger than the area of the bottom surface 63. The bottom valve 6 is driven by the high pressure air in the valve control air passage 16 and the top pressure collecting chamber 171 with the top surface 62, and is moved down to the second position 174, so that the bottom valve 6 closes the exhaust valve port 65 and the row. a pneumatic circuit 67 (shown in FIG. 5), and the bottom valve 6 opens the intake valve port 64 and the return air path 66 to communicate the return gas 12, the gas return passage 66, intake valve port 64, the lower guide hole 27 and the bottom cylinder chamber 24.

When the user pushes the safety slider 4 up and presses the trigger 33 (as shown in FIG. 6), the trigger 33 pushes up against the valve stem 31 to control the high pressure air driven valve sleeve 32 of the main air chamber 10. The intake passage 301 is closed, and the exhaust passage 302 is opened at the same time; thus, the high-pressure air in the pressure collecting chamber 51 is discharged to the outside atmosphere via the trigger air passage 13 and the exhaust passage 302, so that the main air chamber 10 in the periphery of the cylinder 2 is The high-pressure air driven head valve 5 is moved up to close the upper exhaust outlet 52 and open the main air valve port 50; at this time, the high-pressure air in the main air chamber 10 is poured into the top cylinder chamber 23 via the main air valve port 50. The driving piston 21 pushes the nail rod 22 downward to move the nail; at the same time, the high pressure air in the valve control air passage 16 and the top pressure collecting chamber 171 also leads to the outside atmosphere via the exhaust passage 302, so that the valve control air passage 16 And the high pressure air in the top pressure collecting chamber 171 is vented and depressurized, so that the bottom valve 6 is driven by the high pressure air in the main gas path 15 and the bottom layer collecting chamber 172 with the bottom surface 63, and is moved up to the first position 173 (with FIG. 5 Shown), the bottom valve 6 closes the intake valve port 64 and the return air path 66 (shown in Figure 4), and the bottom valve 6 opens the exhaust valve port 6 5 and the exhaust gas passage 67 to guide the gas in the bottom cylinder chamber 24 to the outside atmosphere via the lower air guiding hole 27, the exhaust gas path 67, the exhaust valve port 65 and the lower exhaust outlet 14; The gas in the bottom cylinder chamber 24 can be pushed to the outside atmosphere via the exhaust gas passage 67 and the lower exhaust outlet 14 as the piston 21 moves downward to avoid back pressure in the bottom cylinder chamber 24.

During the downward movement of the nail rod 22, the high-pressure air in the top cylinder chamber 23 can also be diverted into the return air chamber 12 through the upper air guiding hole 25 to accumulate pressure (as shown in FIG. 7); after the nail is pressed, the user The trigger 33 is released instantaneously (as shown in FIG. 8), and the trigger 33 releases the valve stem 31 to reset to control the high-pressure air driving valve sleeve 32 in the main air chamber 10 to open the intake passage 301, and simultaneously close the exhaust passage 302 to make the high pressure The air enters the pressure collecting chamber 51 via the intake passage 301 and the trigger air passage 13 to drive the head valve 5 to open the upper exhaust outlet 52, and closes the main air valve port 50, so that the gas in the top cylinder chamber 23 is vented through the upper exhaust outlet 52. In addition to the outside atmosphere; at the same time, the high-pressure air in the main air chamber 10 again enters the accumulation pressure in the top-layer pressure collecting chamber 171 via the intake passage 301 and the valve-controlled air passage 16 (shown in FIG. 2 and FIG. 4) to drive the bottom valve. 6 moves down to the second position 174 to close the exhaust valve port 65 and the exhaust gas path 67 (shown in FIG. 5), and open the intake valve port 64 and the return air path 66 to guide the return air chamber 12 The high-pressure air accumulated therein leads to the bottom gas through the return gas path 66, the intake valve port 64, and the lower air guiding hole 27 Chamber 24, thereby driving the staple strike shift lever 22 is reset.

It is believed that the above description is sufficient to clearly and fully disclose the necessary technical content that the present invention can be implemented. In particular, the main air passage 15 and the valve control air passage 16 are used to control the bottom valve 6 to actuate the bottom valve 6 to precisely control the bottom layer. The timing of the cylinder chamber 24 communicating with the return air chamber 12, and the timing at which the bottom cylinder chamber 24 communicates with the outside atmosphere, to relieve the back pressure generated in the bottom cylinder chamber 24 during the nailing process of the nail gun without affecting the cylinder 2 The inner high-pressure air drives the piston 21 to push the kinetic energy of the nail pushing the nail 22 downward, thereby improving the efficiency and smoothness of the nail when the nail is continuously hammered; meanwhile, the lower exhaust outlet 14 can be controlled by the trigger valve 3 The state is opened to prevent the dust in the outside air from accumulating into the gun body 1 through the lower exhaust outlet 14 at any time, and the air passage is blocked and the member is worn.

Referring to FIG. 9 , a cross-sectional view of a second embodiment of the present invention is disclosed, illustrating that the present invention can also be implemented in a high-pressure air opening and closing valve for supplying a main air chamber when the trigger valve stem is pressed. The conventional gun body 1a is different from the above-mentioned first embodiment in that the valve control air passage 16a is used to introduce the high pressure of the main air chamber by the trigger valve when the user presses the trigger valve stem. Air to generate a collecting pressure; the bottom valve 6a divides the valve chamber 17a into a top collecting chamber 171a (shown in FIG. 11) communicating with the main air passage 15a, and a communicating valve-controlled air passage 16a The bottom pressure collecting chamber 172a; the outer wall of the bottom valve 6a forms a bottom surface 63a which can be driven by the high pressure air in the valve control air passage 16a, and a top surface 62a which can be driven by the high pressure air in the main air passage 15a, and the bottom surface 63a The area is greater than the area of the top surface 62a, and further defines that the bottom valve 6a receives the high-pressure air driven by the valve-controlled air passage 16a. The force is greater than the high-pressure air in the main air passage 15a, and the remaining components are equivalent to the first one. Example.

According to the above, in the state that the trigger valve stem is removed, the trigger valve blocks the high-pressure air of the main air chamber from being introduced into the valve control air passage 16a and the bottom layer pressure collecting chamber 172a (as shown in FIG. 9). And the top collecting chamber 171a can accumulate the high-pressure air introduced by the main air passage 15a (shown in FIG. 11), so that the bottom valve 6a receives the high pressure in the main air passage 15a and the top collecting chamber 171a along with the top surface 62a. The air is driven and moved down to the second position 174a to direct high pressure air in the return air chamber 12a to the bottom cylinder chamber 24a. When the trigger valve stem is buckled, the trigger valve guides the high pressure air in the main air chamber into the valve control air passage 16a (as shown in FIG. 10), so that the bottom pressure collecting chamber 172a accumulates the valve control air passage 16a. The introduced high-pressure air (shown in FIG. 12) causes the bottom valve 6a to be driven by the bottom surface 63a to receive the high-pressure air in the valve-controlled air passage 16a and the bottom layer collecting chamber 172a, and is moved up to the first position 173a to The gas in the bottom cylinder chamber 24a is guided to the lower exhaust outlet 14a, and the remaining embodiments are equivalent to the first embodiment described above.

According to this, the nail kinetic energy, the operation efficiency and the smoothness of the nail gun during the continuous nailing are improved, and the dust in the outside air can be prevented from entering the gun body 1 at any time via the lower exhaust outlet 14a.

In the above, the present invention is not limited to the preferred embodiment of the present invention, and other equivalent modifications or substitutions that are not departing from the spirit of the present invention should be included in the following patent application. Within the scope.

1, 1a. . . Gun body

10. . . Main air chamber

11. . . Grip

12, 12a. . . Return air chamber

13. . . Trigger airway

14, 14a. . . Lower exhaust outlet

15, 15a. . . Main gas road

16, 16a. . . Valve controlled air line

17, 17a. . . Valve room

171, 171a. . . Top layer pressure chamber

172, 172a. . . Bottom gathering chamber

173, 173a. . . First position

174, 174a. . . Second position

18. . . Cushion

19. . . Ring groove

2. . . cylinder

twenty one. . . piston

twenty two. . . Nail bar

twenty three. . . Top cylinder chamber

24, 24a. . . Bottom cylinder chamber

25. . . Upper air vent

26. . . One-way choke valve ring

27. . . Lower air vent

3. . . Trigger valve

30. . . Valve body

301. . . Intake passage

302. . . Exhaust passage

31. . . Valve stem

32. . . Valve sleeve

33. . . trigger

4. . . Safety slider

5. . . Head valve

50. . . Main air valve port

51. . . Cushion chamber

52. . . Upper exhaust outlet

6, 6a. . . Bottom valve

61. . . Convex ring

62, 62a. . . Top surface

63, 63a. . . Bottom

64. . . Intake valve port

65. . . Exhaust valve port

66. . . Return airway

67. . . Pressure channel

71. . . First air ring

72. . . Second air ring

73. . . Third air ring

74. . . Fourth air ring

Figure 1 is a cross-sectional view showing the configuration of the first embodiment of the present invention.

Figure 2 is an enlarged cross-sectional view of the bottom valve of Figure 1.

Figure 3 is a cross-sectional view of the valve chamber of Figure 1.

Figure 4 is a partial enlarged cross-sectional view of the bottom valve of Figure 1.

Figure 5 is a cross-sectional view showing the state of use of Figure 4.

Figure 6 is a cross-sectional view showing the state of use of Figure 1.

Figure 7 is a cross-sectional view showing the state of use of Figure 6.

Figure 8 is a cross-sectional view showing the state of use of Figure 7.

Figure 9 is a cross-sectional view showing the configuration of a second embodiment of the present invention.

Figure 10 is a cross-sectional view showing the state of use of Figure 9.

Figure 11 is a partially enlarged cross-sectional view showing the bottom valve of Figure 9.

Figure 12 is a partially enlarged cross-sectional view showing the bottom valve of Figure 10.

1. . . Gun body

10. . . Main air chamber

11. . . Grip

12. . . Return air chamber

13. . . Trigger airway

14. . . Lower exhaust outlet

15. . . Main gas road

16. . . Valve controlled air line

17. . . Valve room

171. . . Top layer pressure chamber

172. . . Bottom gathering chamber

18. . . Cushion

2. . . cylinder

twenty one. . . piston

twenty two. . . Nail bar

twenty three. . . Top cylinder room

twenty four. . . Bottom cylinder chamber

25. . . Upper air vent

26. . . One-way choke valve ring

27. . . Lower air vent

3. . . Trigger valve

30. . . Valve body

301. . . Intake passage

31. . . Valve stem

32. . . Valve sleeve

33. . . trigger

4. . . Safety slider

5. . . Head valve

50. . . Main air valve port

51. . . Cushion chamber

52. . . Upper exhaust outlet

6. . . Bottom valve

Claims (14)

A nail gun back pressure relief device is provided in a gun body configured with a main air chamber, a cylinder, a return air chamber, a lower exhaust outlet, an underlying cylinder chamber and a trigger valve and a valve stem thereof The utility model comprises: a bottom valve, a movable sleeve is disposed on a bottom edge of the outer periphery of the cylinder; a main air passage is formed at a periphery of the cylinder, and communicates with the main air chamber to guide high pressure air to drive the bottom valve; and a valve control air passage, Formed on the periphery of the cylinder, and communicates with the main air chamber via the trigger valve, and guides the high-pressure air to drive the bottom valve; wherein: the bottom valve is limited to receive the high-pressure air driven by the valve-controlled air passage, and the force is greater than the main The high-pressure air in the air passage, in the state of removing the trigger valve stem, causes the bottom valve to guide the high-pressure air in the return air chamber to the bottom cylinder chamber, and when the trigger valve stem is buckled, the bottom valve guide The gas in the bottom cylinder chamber is led to the lower exhaust outlet. The nail gun back pressure relief device of claim 1, wherein the high pressure air in the main air passage drives the bottom valve to move to guide the gas in the bottom cylinder chamber to the lower exhaust outlet The first position, and the high pressure air in the valve control passage drives the bottom valve to move to a second position that guides the high pressure air in the return air chamber to the bottom cylinder chamber. The nail gun back pressure relief device of the nail gun of claim 1, wherein a bottom pressure collecting chamber connecting the valve control air passage is formed between the bottom valve and the inner wall of the gun, and the main gas is connected a bottom pressure collecting chamber of the road, the top pressure collecting chamber can accumulate high pressure air introduced by the valve control gas passage to drive the bottom valve, and the bottom layer collecting chamber can accumulate high pressure air introduced by the main air passage to drive the Bottom valve. The nail gun back pressure relief device of claim 1, wherein the bottom wall of the bottom valve forms a top surface that can be driven by the high pressure air in the valve control air passage, and the main air passage is acceptable. The bottom surface of the inner high-pressure air drive, the bottom valve is driven by the high-pressure air in the valve-controlled air passage, and the bottom valve is driven by the bottom surface to receive high-pressure air in the main air passage. The nail gun back pressure relief device according to the first, second, third or fourth aspect of the patent application, wherein the bottom valve receives the high pressure in the valve control circuit when the trigger valve stem is removed. The air is driven to vent the high pressure air in the valve control passage when the trigger valve stem is buckled, so that the bottom valve is driven by the high pressure air in the main air passage. The nail gun back pressure relief device according to claim 1, wherein the high pressure air in the valve control air passage drives the bottom valve to move to guide the gas in the bottom cylinder chamber to the lower exhaust The first position of the outlet, and the high pressure air in the main air passage drives the bottom valve to move to a second position that can direct the high pressure air in the return air chamber to the bottom cylinder chamber. The nail gun back pressure relief device of the nail gun of claim 1, wherein the bottom valve and the inner wall of the gun form an underlying pressure collecting chamber connecting the valve control air passage, and a main gas is connected a top pressure collecting chamber of the road, the bottom collecting chamber can accumulate high pressure air introduced by the valve control air passage to drive the bottom valve, and the top collecting chamber can accumulate high pressure air introduced by the main air passage to drive the Bottom valve. The nail gun back pressure relief device of claim 1, wherein the bottom valve outer wall forms a bottom surface that can be driven by the high pressure air in the valve control air passage, and is receivable in the main air passage. a top surface of the high-pressure air drive, the bottom valve is driven by the bottom surface to receive high-pressure air in the valve-controlled air passage, and the bottom valve is driven by the top surface to receive high-pressure air in the main air passage. The nail gun back pressure relief device according to the first, sixth, seventh or eighth aspect of the patent application, wherein the bottom valve receives the high pressure air in the main air passage when the trigger valve stem is removed. The driving device guides the high-pressure air in the main air chamber into the valve-controlled air passage when the trigger valve stem is buckled, so that the bottom valve is driven by the high-pressure air in the valve-controlled air passage. A nail gun back pressure relief device is provided in a gun body configured with a main air chamber, a cylinder, a return air chamber, a lower exhaust outlet, an underlying cylinder chamber and a trigger valve and a valve stem thereof The utility model comprises: a main gas path formed on the periphery of the cylinder and communicating with the main air chamber to introduce high-pressure air to generate a collecting pressure; a valve-controlled air path formed on the periphery of the cylinder and connected via the trigger valve The main air chamber is configured to introduce a high pressure air to generate a pressure collecting function, and when the trigger valve stem is buckled, the high pressure air of the valve control air passage is vented to generate a pressure reducing effect; a valve chamber is formed at the periphery of the cylinder Between the bottom edge and the inner wall of the gun, the return air chamber communicates with the top end of the valve chamber, the bottom cylinder chamber and the lower exhaust outlet communicate with the bottom end of the valve chamber; and a bottom valve is sleeved on the outer periphery of the cylinder a rim, and is slidably disposed in the valve chamber, and the bottom valve partitions the valve chamber into a top concentrating chamber that communicates with the valve control gas path, and a bottom concentrating chamber that communicates with the main gas path, the top layer is pressurized The chamber accumulates the high pressure air introduced by the valve control air passage to drive the bottom Moving to a second position that can guide the high pressure air in the return air chamber to the bottom cylinder chamber, and the bottom pressure collecting chamber accumulates the high pressure air introduced by the main air passage, and presses the trigger valve stem to vent the valve When the high pressure air in the air passage is controlled, the bottom valve is driven to move to a first position that can guide the gas in the bottom cylinder chamber to the lower exhaust outlet. A nail gun back pressure relief device is provided in a gun body configured with a main air chamber, a cylinder, a return air chamber, a lower exhaust outlet, an underlying cylinder chamber and a trigger valve and a valve stem thereof The utility model comprises: a main gas path formed on the periphery of the cylinder and communicating with the main air chamber to introduce high-pressure air to generate a collecting pressure; a valve-controlled air path formed on the periphery of the cylinder and connected via the trigger valve The main air chamber, when the trigger valve stem is buckled, is introduced into the high pressure air of the main air chamber to generate a collecting force; a valve chamber is formed between the outer peripheral edge of the cylinder and the inner wall of the gun, the returning process a gas chamber is connected to the top of the valve chamber, the bottom cylinder chamber and the lower exhaust outlet are connected to the bottom end of the valve chamber; and a bottom valve is sleeved on the bottom edge of the cylinder and is slidably disposed in the valve chamber, and the valve chamber is disposed in the valve chamber. The bottom valve partitions the valve chamber into a top pressure collecting chamber that communicates with the main gas path, and a bottom layer collecting chamber that communicates with the valve control gas path, and the top collecting chamber accumulates high pressure air introduced by the main gas path to Driving the bottom valve to move to a high pressure air that can guide the return air chamber In the second position of the bottom cylinder chamber, when the trigger valve stem is buckled to introduce the high pressure air into the valve control air passage, the bottom pressure collecting chamber accumulates the high pressure air introduced by the valve control air passage to drive the bottom valve Moving to a first position that directs gas in the bottom cylinder chamber to the lower exhaust outlet. The nail gun back pressure relief device of claim 10, wherein the outer wall of the bottom valve forms a top surface that can be exposed in the top pressure collecting chamber, and a bottom surface can be exposed to the bottom layer. a bottom surface of the chamber, the bottom valve is driven to the second position by the top surface receiving the high pressure air in the top collecting chamber, and the bottom valve is driven to the first position by the bottom surface receiving the high pressure air in the bottom collecting chamber. The nail gun back pressure relief device of the nail gun according to claim 10 or 11, wherein the bottom valve receives a high-pressure air driven by the valve-controlled air passage, and the force is greater than the high-pressure air in the main air passage. The nail gun back pressure relief device of the nail gun of claim 1, wherein the inner wall of the bottom valve and the outer wall of the cylinder form an intake valve port, and the return air chamber is controlled to The bottom cylinder chamber, and an exhaust valve port is formed between the bottom of the bottom valve and the inner wall of the gun, and the bottom cylinder chamber is controlled to the lower exhaust outlet, and the bottom valve is moved down to close the exhaust valve port. And opening the intake valve port, the bottom valve moves up to close the intake valve port, and opens the exhaust valve port.