The present invention relates to a nail gun having an air injection mechanism, and particularly to a pneumatic nail gun having a valve rod disposed in a compressed air chamber thereof
Pneumatic nail gun generally utilizes a compressed high pressure air in an air chamber thereof to drive a piston to beat a nail, for join two objects by shooting a nail through both objects, which are widely used in woodworking.
During the process of nailing up the objects by the pneumatic nail gun, a mass of dusts and wood chips are liable to be generated and distribute all over the objects, then, the positions of the objects to be nailed are covered by the dusts and wood chips. Therefore, a high pressure air gun is employed to blow off the dusts and wood chips. However, the operator has to take a high pressure air gun when he or she nail up objects by the pneumatic nail gun, which unduly increase the burden and make the operation inconveniently.
Laid open Japanese Patent No. 2004-001136 disclosed an improved nail gun having an air injection mechanism to overcome the problems above-described, which includes an air injection valve disposed besides an air chamber of a gun body of the nail gun. The air injection valve is connected to a nozzle via an air injection passage, and is connected with the air chamber via an air guiding passage. Moreover, a redactor is disposed at one of the air injection passage and the air guiding passage so as to reduce the pressure of the compressed air in the air injection passage or the air guiding passage via adjusting the redactor. The compressed air are injected out from the nozzle via pressing the air injection valve to guide the compressed air from the air guiding passage to the air injection passage.
However, the nail gun includes an air injection passage, an air guiding passage, and a redactor disposed at one of the air injection passage and the air guiding passage. These passages and the redactor make the configuration of the nail gun unduly complicated, and make the cost of the nail gun unduly high. Furthermore, the redactor may only reduce certain pressure of the compressed air, which may not enable the operator to freely control the pressure and flux of the air injected from the nozzle.
Accordingly, what is needed is a pneumatic nail gun that can overcome the above-described deficiencies.
An air injection mechanism is disposed in a pneumatic nail gun, which includes an air injection valve rod disposed in an air chamber of a gun body. The valve rod is integrated with the air chamber so as to simplify the configuration of the air injection mechanism and the number of the air guiding passage. Moreover, the pressure and flux of the air injecting from the nozzle may be controlled via pressing on the valve rod. Therefore, the air injection mechanism integrated with the nail gun may make it lower in cost and facility in use.
The air injection mechanism of the present invention includes a gun body having a head cover at a top portion of the gun body, and an air chamber for guiding high pressure air into the gun body and maintaining a certain pressure in the gun body; a valve base disposed at a side surface of the gun body and adjacent to one end of the air chamber, which is integrated with the side surface or is fixed to the side surface via screws; a valve rod axially attached to a rod hole of the valve base and extend out of the gun body to form a press button for pushing the valve rod by pressing the button under outside force, another end of the valve rod extends through the air chamber and axially attached to another side surface of the gun body, the valve rod and the rod hole cooperate with each other to form an air guiding gap therebetween, the gap is connected to the air chamber, and the valve rod forms a ringed pushing surface enable to reposition via pushed by the high pressure air; an air guiding passage formed in the valve rod, which includes an air inlet port connecting to the air guiding gap and an air injection port connecting to environment; and at least one O-ring disposed at an inner surface of the rod hold that between the air guiding gap and the air inlet port for controlling the flux of the air that transmit from the air inlet port to the air injection port as well as the operation state of the air inlet port.
The air injection mechanism of the nail gun further includes an O-ring disposed between the valve rod and the gun body, and another O-ring disposed between the valve rod and the rod hole.
The press end includes a press button thereof, which includes a male thread for engaging with a screw cap for use in adjusting the moving distance of the valve rod, a plurality of axial bead grooves alternatively disposed adjacent to the male thread, and a spring bead enable to nest in or release from one of the bead grooves.
The gun body further includes a press plate for conveniently pressing or releasing the press end.
These and other features and advantages of the various embodiments disclosed herein will be better understood with respect to the following description and drawings, in which like numbers refer to like parts throughout, and in which:
Referring to
The gun body 1 includes an compressed air chamber 11 for guiding high pressure air into the gun body and maintaining a certain high pressure therein, and a head cover 10 disposed at a top portion of the gun body.
The valve base 2 is disposed at a side surface of the head cover 10 of the gun body 1, and adjacent to one end of the air chamber 11, which is integrated with the side surface or is fixed to the side surface via screws. The valve base 2 includes a rod hole 21 (shown in
One end of the valve rod 3 is axially attached to the rod hole 21 of the valve base 2, and extends out of the gun body 1 to form a press end 31. A press button 4 is nested with the press end 31. The other end of the valve rod 3 extends through the air chamber 11 and axially attached to another side surface of the head cover 10 of the gun body 1. The valve rod 3 and the rod hole 21 cooperate with each other to form an air guiding gap 20 therebetween, and the air guiding gap 20 is connected to the air chamber 11. The valve rod 3 forms a ringed pushed surface 32. An O-ring 51 is disposed between the valve rod 3 and the side surface of the head cover 10, and another O-ring 52 is disposed between the valve rod 3 and the rod hole 21 for prevent the high pressure air in the air chamber 11 from discharging.
The air guiding passage 33 is formed in the valve rod 3, which includes an air inlet port 331 connecting to the air guiding gap 20 and an air injection port 332 connecting to environment.
The O-ring 5 is disposed at an inner surface of the rod hold 21 that between the air guiding gap 20 and the air inlet port 331 for blocking the high pressure air in the air chamber 11 from transmitting to the air inlet port 331 via the air guiding gap 20.
With these configurations, the air injection mechanism may be used. In operation, when the press button 4 is not pressed, the high pressure air in the air chamber 11 may push the ringed pushed surface 32 to press and fasten the valve rod 3 in the rod hole 21 of the valve base 2. The O-ring 5 blocks between the air guiding gap 20 and the air inlet port 331 so as to prevent the high pressure air in the air chamber 11 from transmitting into the air guiding passage 33. Therefore, there is no air discharging from the air injection port 332 at the other side of the head cover 10. On the other hand, when the press button 4 is pressed by the operator, the press end 31 induced by the press button may move along the rod hole 21, then the air inlet port 331 may move away from the O-ring 5 to guide the high pressure air in the air chamber 11 into the air inlet port 331 via the air guiding gap 20, and the high pressure air are transmitted to the air injection port 332 as well as are injected therefrom.
Moreover, a bottom portion of the press button 4 (shown in
In addition, a bottom portion of the press button 4 (shown in
Furthermore, the male thread 311 (shown in
The air injection mechanism according to the present invention may further includes a press plate 7 engaging with the head cover 10 of the gun body 1 (shown in
The above description is given by way of example, and not limitation. Given the above disclosure, one skilled in the art could devise variations that are within the scope and spirit of the invention disclosed herein, including configurations ways of the recessed portions and materials and/or designs of the attaching structures. Further, the various features of the embodiments disclosed herein can be used alone, or in varying combinations with each other and are not intended to be limited to the specific combination described herein. Thus, the scope of the claims is not to be limited by the illustrated embodiments.
Number | Name | Date | Kind |
---|---|---|---|
4384668 | Tutomu et al. | May 1983 | A |
6783050 | Ishizawa et al. | Aug 2004 | B2 |
20040026477 | Ishizawa et al. | Feb 2004 | A1 |
20050072275 | Sasak et al. | Apr 2005 | A1 |
20050211745 | Ishizawa et al. | Sep 2005 | A1 |
20060006207 | Akiba et al. | Jan 2006 | A1 |
20060144889 | Nishikawa et al. | Jul 2006 | A1 |
20060151565 | Nishikawa et al. | Jul 2006 | A1 |
20070059186 | Weaver et al. | Mar 2007 | A1 |
20070210132 | Akiba | Sep 2007 | A1 |
20070227477 | Akiba et al. | Oct 2007 | A1 |
20070290021 | Komazaki | Dec 2007 | A1 |
Number | Date | Country |
---|---|---|
2004-1136 | Jan 2004 | JP |
Number | Date | Country | |
---|---|---|---|
20080087704 A1 | Apr 2008 | US |