Manual pump

Details Manual pump Manual pump

1997-04-17

1998-10-20

Thorpe, Timothy

Pumps

Expansible chamber type

417571, 425508, F04B 3910, E03D 1100

Patent

active

058237542

ABSTRACT:
A manual pump includes first and second tubular members. The first tubular member has an upper closed end, a lower open end, and a piston member extending through and mounted movably in the first tubular member. The second tubular member has an upper open end which is fixed sealingly to the lower open end of the first tubular member, a lower closed end, an inflow check valve, an outflow check valve, and two connecting tubes connected to the external face of the second tubular member. Each of the connecting tubes is communicated with a corresponding one of the inflow and outflow check valves.

REFERENCES:
patent: 1769061 (1930-07-01), Hitchcock
patent: 2259644 (1941-10-01), Kling
patent: 2267064 (1941-12-01), Wikelund
patent: 2456092 (1948-12-01), Storevik
patent: 4053955 (1977-10-01), Canham
patent: 4542543 (1985-09-01), Irwin
patent: 5071325 (1991-12-01), Tupper et al.
patent: 5156538 (1992-10-01), Lee
patent: 5239708 (1993-08-01), Irwin

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