Two-stroke operable pump

Details Two-stroke operable pump Two-stroke operable pump

1999-03-15

2000-09-19

Walberg, Teresa

Pumps

Expansible chamber type

Plural pumping chambers

417531, 417534, F04B 100

Patent

active

061202657

ABSTRACT:
A pump includes a main body, an inner tube mounted in the main body, and a hollow piston slidably mounted in the main body and partially receiving the inner tube. A piston is mounted in the main body and slidable along the inner tube. Two O-rings are mounted in two annular grooves in an outer periphery of the piston. A plug is secured to a lower end of the inner tube and includes two O-rings in two annular groove in an outer periphery thereof. A handle is attached to the piston rod for manual operation. The annular grooves of the piston and the plug include notches arranged in a manner to allow air to be outputted during each stroke of the piston rod.

REFERENCES:
patent: 5180283 (1993-01-01), Vickery, III
patent: 5531575 (1996-07-01), Lin
patent: 5626072 (1997-05-01), Mirand et al.
patent: 5683234 (1997-11-01), Chuang et al.
patent: 5713723 (1998-02-01), Hathaway
patent: 5779457 (1998-07-01), Chuang et al.
patent: 5902097 (1999-05-01), Wu
patent: 6017196 (2000-01-01), Wu
patent: 6027319 (2000-02-01), Winefordner et al.

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