Two-stage hand pump

Details Two-stage hand pump Two-stage hand pump

2008-04-08

2008-04-08

Leslie, Michael (Department: 3745)

Expansible chamber devices

Relatively movable working members

C092S00600D, C417S487000

Reexamination Certificate

active

07353746

ABSTRACT:
A hand pump for inflating rafts or similar inflatables has a first piston with a relatively low pumping volume which is capable of pumping relatively small volumes of air into a raft as the raft becomes full and is approaching its maximum pressure, and a second piston with a larger pumping volume that can pump larger volumes of air into a raft when it is empty or only partially filled. Both pistons are operated with a single plunger. When the plunger is rotated in a first direction to a first position a locking mechanism allows it to operate only the first piston, and when the plunger is rotated in a second direction to a second position the locking mechanism allows it to operate only the second piston.

REFERENCES:
patent: 670811 (1901-03-01), Phelps
patent: 753530 (1904-03-01), Ten Eyck
patent: 3224378 (1965-12-01), Graham
patent: 5807078 (1998-09-01), Chen
patent: 5997256 (1999-12-01), Gunther
patent: 6135733 (2000-10-01), Wu
patent: 6257849 (2001-07-01), Wu
patent: 6299420 (2001-10-01), Saputo et al.
patent: 6325601 (2001-12-01), Wu
patent: 6676390 (2004-01-01), Wang
Brochure on K-Pump Models SK100 and K200.

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