Hand pump of a drinking device for pumping water to a diver

Details Hand pump of a drinking device for pumping water to a diver Hand pump of a drinking device for pumping water to a diver

1996-08-12

1997-06-03

Thorpe, Timothy

Pumps

Expansible chamber type

Valved piston

417556, 2223831, 222341, 405186, 12920215, B63C 1102, F04B 5312

Patent

active

056347804

ABSTRACT:
A drinking device for a diver includes a water container and a hand pump for pumping water to the diver's mouth. The hand pump includes a piston rod slidably engaged in a housing and two discs secured to the piston rod for separating the housing into an upper and a lower chambers. A passage is formed in the lower portion of the piston rod and has an aperture for communicating with a space formed between the discs. A sealing ring is slidably disposed in the space and may move upward to enclose the aperture for pumping the water in the lower chamber out of the housing. The sealing ring may also move downward to open the aperture for allowing the water in the upper chamber to flow into the lower chamber.

REFERENCES:
patent: 3752604 (1973-08-01), Dorn
patent: 4398533 (1983-08-01), Barker
patent: 4815893 (1989-03-01), Feder
patent: 5389024 (1995-02-01), Chen
patent: 5524612 (1996-06-01), Chen
patent: 5533879 (1996-07-01), Chen

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