Hand pump for pumping air of lower pressure and high pressure

Details Hand pump for pumping air of lower pressure and high pressure Hand pump for pumping air of lower pressure and high pressure

1997-04-29

1998-07-14

Freay, Charles G.

Pumps

Expansible chamber type

Moving cylinder

417468, 417469, 417487, F04B 1902

Patent

active

057794570

ABSTRACT:
A hand pump includes a cylindrical member having a cap secured on top and a cover securing the cap to the cylindrical member. A large piston is slidably engaged in the cylindrical member and a barrel secured to the large piston. A small piston is slidably engaged in the barrel for pumping air into the cylindrical member and the cover. The small piston may pump a low air pressure when the barrel is not secured to the cylindrical member and may pump a high air pressure when the barrel is secured to the cylindrical member.

REFERENCES:
patent: 1351847 (1920-09-01), Gerhart
patent: 2348190 (1944-05-01), Bullock
patent: 4012174 (1977-03-01), Seibel et al.
patent: 5443370 (1995-03-01), Wang
patent: 5507626 (1996-04-01), Yang

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