Pump

Details Pump Pump

2005-10-25

2005-10-25

Behfiend, Harvey E. (Department: 3644)

Mechanical guns and projectors

Fluid pressure

Provided by movement of user-actuated, projector-mounted...

C417S464000

Reexamination Certificate

active

06957646

ABSTRACT:
An air gun includes an air pump with a pumping piston mounted to reciprocate within a pump cylinder, which is mounted on the barrel of the gun to pivot about an axis transverse to the longitudinal axis of the barrel so that as the pump cylinder is moved back and forth around the pivot, the cylinder and piston reciprocate relative to each other to pump air into a high pressure housing carried by the pump cylinder. A discharge conduit is also provided for releasably connecting the high pressure housing to the breach end of a gun barrel when the pump is moved toward the barrel. A firing valve in the discharge conduit releases air from the high pressure housing into the breach end of the barrel. Preferably, a floating differential piston disposed to reciprocate in a high pressure housing divides the housing into a storage chamber and a high pressure chamber. A pressure relief valve extending through the differential piston permits compressed air to flow from the storage chamber to the firing chamber, and maintains a higher pressure in the storage chamber than in the firing chamber. The end of the piston in the firing chamber seals a greater cross sectional area than the end of the piston in the storage chamber so that a piston is forced to move into the storage chamber by an amount which balances the forces on the opposite end of the piston. The gun barrel muzzle includes at least one lateral opening for venting compressed air as a pellet leaves the muzzle end of the barrel.

REFERENCES:
patent: 510036 (1893-12-01), Lowth
patent: 1292665 (1919-01-01), Udesen
patent: 1486215 (1924-03-01), Zerbee
patent: 1831379 (1931-11-01), Creser
patent: 2119441 (1938-05-01), Price
patent: 2145277 (1939-01-01), Reardon
patent: 2652821 (1953-09-01), Fitch
patent: 2781166 (1957-02-01), Flood et al.
patent: 4242060 (1980-12-01), Price
patent: 4304213 (1981-12-01), Jereckos
patent: 4472794 (1984-09-01), Chelminski
patent: 4572152 (1986-02-01), Olofsson et al.
patent: 4709686 (1987-12-01), Taylor et al.
patent: 4771758 (1988-09-01), Taylor et al.
patent: 4844046 (1989-07-01), Straub
patent: 4850329 (1989-07-01), Taylor et al.
patent: 4928661 (1990-05-01), Bordt et al.
patent: 5118265 (1992-06-01), Bearss
patent: 5193517 (1993-03-01), Taylor et al.
patent: 5224465 (1993-07-01), Milliman
patent: 5341790 (1994-08-01), Ebert
patent: 5538398 (1996-07-01), Elson
patent: 5617837 (1997-04-01), Momirov
patent: 5798474 (1998-08-01), Rogers et al.
patent: 5813392 (1998-09-01), McCaslin
patent: 6343598 (2002-02-01), Pshenychny
patent: 4419680 (1995-08-01), None
patent: 2633709 (1990-01-01), None
Internet papers: B. Saltzman, “Three Basic Types of Airguns”, Beeman Precision Airguns, http://beeman.com/types.htm, four pages, retrieved on Jul. 11, 2001.

Affiliated with

Also associated with

Rating

Pump does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pump, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pump will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3460966