Patent Grant
7628148
(1) Field of the Invention
The present invention relates to a shooting mechanism for paint ball gun and the piston rod of the valve in the gun does not generate much vibration when shooting.
(2) Description of the Prior Art
A conventional paint ball gun includes a valve which includes a piston rod which controls the communication of the valve and the chamber in the barrel of the gun. The piston rod is hit by a strike rod so as to open the valve to introduce pressurized air into the barrel to shoot the pain ball. The piston rod is applied by the pressurized air in a direction opposite to the direction that the piston rod is hit and moved, so that the strike rod has to hit the piston rod hard enough to overcome the force applied to the piston rod and this generates a significant reaction force to the gun. How to reduce the reaction force is one of the most concerns of a satisfied pain ball gun.
US 2006003759 discloses an improved design wherein the piston rod includes an enlarged portion which defines a small chamber in the valve and the chamber is communicates with a main chamber from which the pressurized air is stored. The pressurized air in the main chamber provides limited air to the small chamber so as to assist the movement of the piston rod when the piston rod is hit by the strike rod. By this way, the strike rod does not need to apply that much of force to move the piston rod, so that the reaction force applied to the user's hand can be reduced. However, when the piston rod is hit by the strike rod, a certain part of the piston rod extends out from the valve and that part does not have any support or positioning means to hold. When the piston rod is pulled back, that part might not be able to smoothly moves back to its original position.
The present invention intends to provide a shooting mechanism for a paint ball gun wherein the valve includes a shoulder which prevents the piston rod from extending too much from the valve after being hit by the strike rod.
The present invention relates to a paint ball gun that comprises a handle connected with a main which includes an air tube connected with the handle and a shoot tube located parallel to the air tube. A communication hole is defined in communication between the shoot tube and the air tube. A push member is movably located in the shoot tube so as to push paint balls out from the shoot tube. A strike rod is movably received in a rear end of the air tube and connected with the push member. A first chamber is defined in a front end of the air tube and pressurized air is provided into the first chamber from a pressurized source. A valve is located in the air tube and includes a first member and a second member is threadedly connected to an end of the first member. A piston rod movably extends through the valve. The first member includes a space defined therein and a shoulder extends radially and inward from an inner periphery of the first member. An aperture is defined through a wall of the first member and in communication between the shoot tube and the space. Two ends of the piston rod extend out from the first and second members respectively. A piston head is connected to an end of the piston rod and removably contacts an end of the first member so as to seal the space. The other end of the piston rod extends out from the second member and faces the strike rod. A flange extends radially outward from the piston rod and is located between the shoulder and an inner end of the second member. A second chamber is defined between the flange and the inner end of the second member. a path is defined axially in the piston rod and communicates with the piston head so as to introduce pressurized air from the first chamber into the second chamber. The flange is stopped by the shoulder of the first member when the position rod is hit by the strike rod.
The primary object of the present invention is to provide a shooting mechanism wherein the piston rod is stopped by the shoulder in the valve so that the piston rod does not overly protrude from the valve when shooting.
Another object of the present invention is to provide a shooting mechanism wherein the movement of the piston rod is steady and does not shake due to the contact between the shoulder in the valve and the flange of the piston rod.
Yet another object of the present invention is to provide a shooting mechanism wherein the second member of the valve includes radial holes and grooves to release the air in the second member of the valve when the piston rod moves back to its original position.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
Referring to
A first chamber 42 is defined in a front end of the air tube 40 and the pressurized air from the bottle is provided into the first chamber 42. The valve 50 is located in the air tube 40 and includes a first member 511 and a second member 512 which is threadedly connected to an end of the first member 511. A piston rod 52 movably extends through the valve 50. The first member 511 includes a space 5112 defined therein and a shoulder 5111 extends radially and inward from an inner periphery of the first member 511. The shoulder 5111 is located close to a threaded connection position between the first and second members 511, 512. An aperture is defined through a wall of the first member 511 and in communication between the shoot tube 30 and the space 5112. The second member 512 includes a plurality of radial holes 5121 defined through a wall thereof and communicate with grooves 5122 defined axially in an outer periphery of the second member 512.
Two ends of the piston rod 52 extend out from the first and second members 511, 512 respectively. A piston head 521 is threadedly connected to an end of the piston rod 52 and removably contacts an end of the first member 511 so as to seal the space 5112. The other end of the piston rod 52 extends out from the second member 512 and faces the strike rod 41. A flange 522 extends radially outward from the piston rod 52 and is located between the shoulder 5111 and an inner end of the second member 512. A cross sectional area of the piston head 521 is larger than a cross sectional area of the flange 522, so that the pressurized air applies a larger force to the piston head 521 than to the flange 522. A second chamber 53 is defined between the flange 522 and the inner end of the second member 512. A path 523 is defined axially in the piston rod 52 and communicates with the piston head 521 so as to introduce pressurized air from the first chamber 42 into the second chamber 53. The flange 522 can be stopped by the shoulder 5111 of the first member 511 when the strike rod 41 hits the piston rod 52. A side hole 524 is defined through a wall of the piston rod 52 and communicates with the path 523 and the second chamber 523.
As shown in
When the piston rod 52 moves backward to its original position, the second member 512 of the valve 50 has radial holes 5121 and grooves 5122 to release the air in the second chamber 53 in the second member 512 of the valve 50 when the piston rod moves back to its original position. The air is then released from the escape hole 43.
While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
| Number | Name | Date | Kind |
|---|---|---|---|
| 6553983 | Li | Apr 2003 | B1 |
| 20060037597 | Wood | Feb 2006 | A1 |
| Number | Date | Country | |
|---|---|---|---|
| 20090255523 A1 | Oct 2009 | US |
