Mechanical guns and projectors – Fluid pressure – With control for discharge of fluid pressure
Reexamination Certificate
2001-04-05
2002-12-24
Jordan, Charles T. (Department: 3644)
Mechanical guns and projectors
Fluid pressure
With control for discharge of fluid pressure
C124S073000, C124S074000
Reexamination Certificate
active
06497229
ABSTRACT:
BACKGROUND
1. Field of the Invention
This invention relates to an air gun supplied with a compressed fluid such as compressed air, chlorofluorocarbons, or carbon dioxide, for discharging a bullet such as a BB bullet. More particularly, the invention relates to an air gun of automatic bullet supply type that is capable of discharging a bullet, such as a BB bullet, with a gush by a pressure of a compressed fluid and is capable of being automatically loaded with bullets after discharge.
2. Description of the Related Art
Examples of air sport guns are shown in
FIGS. 17
to
19
which depict conventional automatic air sport guns which utilizes a compressed gas such as air, chlorofluorocarbons, or carbon dioxide.
A first conventional automatic air gun is described in one of the applicant's previous applications, JP Application Serial No. 9-243358(243358/1997) (hereinafter “Prior Art I”). In the automatic air gun of Prior Art I, a problem exists which involves gas pressure reduction of the compressed gas. The gas pressure reduction occurs on carrying out a bullet discharge and a blow-back at a same time. The gas pressure reduction may occur on the basis of a large cylinder volume or a passage volume for a large bullet discharge.
The automatic air gun described in claim
1
of Prior Art I is characterized by comprising:
a load packing positioned at a gun-rear end side for holding loaded bullets;
a magazine positioned at a position lower than that of the load packing in the gun-rear end side, the magazine having an upper opening and being for holding the bullets to always and upwardly push the held bullets;
a cylinder block having a hollow loading pipe mounted at the side of the load packing and a cylinder portion mounted at the gun-rear end side, the loading pipe having a bullet discharge ventilating opening whose one end communicates with a circumference surface of the cylinder portion side and whose another end communicates with the load packing side, a change valve pushing portion being mounted at a side of the load packing in a circumference surface opening of the cylinder portion side so as to project, the cylinder portion having an opening positioned at the gun-rear end side and a blow-back ventilating opening positioned at a circumference surface of a loading pipe side, the cylinder block being able to slide so as to open and close the opening of the magazine upper portion;
a piston block inserted into the cylinder portion so as to be able to slide in the cylinder block;
a compressed gas chamber positioned at a lower and rear position of the barrel for holding the compressed gas, the compressed gas chamber having an exhaust opening for use in exhausting the compressed gas that is positioned at an upper portion of the compressed gas chamber;
a change valve gas chamber having a bullet discharge air-supplying opening opposite to an opening of the loading pipe circumference surface, the change valve gas chamber having a blow-back air-supplying opening opposite to the blow-back ventilating opening of the cylinder portion, the change valve gas chamber being connected to the lower portion of the cylinder block and the exhaust opening of the compressed gas chamber to be supplied with the compressed gas from the compressed gas chamber;
an open-close valve having a stopper projection mounted at a side end of the change valve gas chamber and being positioned in the exhaust opening to be pushed so as to always make the exhaust opening be a closing state, the open-close valve becoming an opening state when the open-close valve moves against the pushing force, to exhaust the compressed gas to the change valve gas chamber; and
a change valve being positioned in the change valve gas chamber and having a projection portion projected to the bullet discharge ventilating opening side at one end of the change valve and a stopper portion capable of stopping the stopper projection of the open-close valve, at another end of the change valve, the change valve carrying out open-close operation of the bullet discharge air-supplying opening so as to supply the compressed gas to the bullet discharge ventilating opening, the change valve making the bullet discharge air-supplying opening be closing state when the stopper portion becomes a stopping state.
In the automatic air sport gun claimed in claim
1
of Prior Art I, the stopper projection is stopped by the stopper portion when the open-close valve changes into, and is maintained in, the opening state and the change valve changes to the closing state. The change valve releases the closing state of the bullet discharge air-supplying opening and the stopper portion releases the stopper projection when the cylinder block slides when the change valve changes to the closing state, so that the projection portion of the change valve is pushed by the change valve pushing portion. As a result, the open-close valve changes to the closing state so that the supply of the compressed gas is stopped.
The automatic air sport gun claimed in claim
2
of Prior Art I is characterized by comprising:
a barrel positioned along a slide in the slide;
a load packing positioned at a gun-rear end side for holding loaded bullets;
a magazine positioned at a position lower than that of the load packing in the gun-rear end side, the magazine having an upper opening and being for holding the bullets to always and upwardly push the held bullets;
a slide mounted from a muzzle to the gun-rear end in a gun upper portion for sliding parallel to the barrel to always be pushed to the muzzle side;
a cylinder block having a hollow loading pipe mounted on the load packing side and a cylinder portion mounted on gun-rear end side, the loading pipe having a bullet discharge ventilating opening whose one end communicates with a circumference surface of the cylinder portion side and whose another end communicates with the load packing side, a change valve pushing portion being mounted at a side of the load packing in a circumference surface opening of the cylinder portion side so as to project, the cylinder portion having an opening positioned at the gun-rear end side and a blow-back ventilating opening positioned at a circumference surface of a loading pipe side, the cylinder block being able to slide so as to open and close the opening of the upper portion of the magazine parallel to the slide;
a piston block mounted on the gun-rear end side of the slide to be capable of being inserted in the cylinder portion, the piston block being able to slide in the cylinder portion together with the movement of the slide;
a hammer rotatably mounted on the gun-rear end side to always rotate towards a muzzle by a applied force;
a sear stopping the hammer rotated towards gun-rear against the applied force to fix the hammer;
a trigger pushed towards the muzzle;
a trigger bar coupled to its one end for synchronizing with the rear movement of the trigger to release the stop of the hammer and the sear in order to rotate the hammer;
a compressed gas chamber positioned at a lower and rear position of the barrel for holding the compressed gas, the compressed gas chamber having an exhaust opening for use in exhausting the compressed gas that is positioned at an upper portion of the compressed gas chamber;
a change valve gas chamber having a bullet discharge air-supplying opening opposite to an opening of the loading pipe circumference surface, the change valve gas chamber having a blow-back air-supplying opening opposite to the blow-back ventilating opening of the cylinder portion, the change valve gas chamber being connected to the lower portion of the cylinder block and the exhaust opening of the compressed gas chamber to be supplied with the compressed gas from the compressed gas chamber;
an open-close valve having a stopper projection which is mounted at a side end of the change valve gas chamber and which is capable of projecting into the change valve gas chamber, the open-close valve having a valve rod which is positioned in opposite to the change valve gas chamber and which is pushed by the hammer, the open
Jordan Charles T.
Maruzen Company Limited
Zen John W.
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