Pumps – Expansible chamber type – Plural pumping chambers
Patent
1996-11-18
1997-11-04
Thorpe, Timothy
Pumps
Expansible chamber type
Plural pumping chambers
417526, 417510, 417534, 137223, 251352, 251258, F04B 5310
Patent
active
056832346
ABSTRACT:
A hand pump includes a piston slidably engaged in a housing for separating the housing into two chambers. A tube is secured on top of the housing. The piston includes two annular grooves for receiving two sealing rings. A piston rod has one end secured to the piston and has the other end extended outward of the housing. The piston may pump the air in upper chamber into the tube when the piston moves upward, and the air in the lower chamber may be pumped into the tube when the piston moves downward. The tube includes two mouths for engaging with different tire valves.
REFERENCES:
patent: 1789306 (1931-01-01), Ewald
patent: 1838166 (1931-12-01), Wahl
patent: 1860888 (1932-05-01), Crowley
patent: 1918689 (1933-07-01), Crowley
patent: 2441253 (1948-05-01), Sarver
patent: 2442631 (1948-06-01), Winkler
patent: 2847028 (1958-08-01), Ross
patent: 3572384 (1971-03-01), Taylor
patent: 5441080 (1995-08-01), Baumann
patent: 5449278 (1995-09-01), Lin
patent: 5531575 (1996-07-01), Lin
patent: 5551848 (1996-09-01), Chuang et al.
U.S. Patent Application Serial Number 08/553,854, filed Nov. 6, 1995 and allowed Mar. 20, 1997.
Chuang Louis
Wu Scott
Baxley Esq. Charles E.
Korytnyk Peter G.
Thorpe Timothy
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