Manual negative pressure pump device

Details Manual negative pressure pump device Manual negative pressure pump device

2005-12-27

2005-12-27

Tyler, Cheryl J. (Department: 3746)

Pumps

Expansible chamber type

Fluid serially moved to opposite side of pumping member

C417S234000, C417S552000, C417S562000, C417S569000

Reexamination Certificate

active

06979184

ABSTRACT:
A manual negative pressure pump device comprises a suction cylinder, a handle, a pull, a piston, and an expandable spring which forms a vacuum absorbing device. A front end of the suction cylinder is a thread post with outer thread. The thread post has a central through hole and a plurality of small air holes around the through hole. The thread post is screwed with a nut of a joint. A valve and a drain-proof ring are installed between the joint and the thread post. The valve is a rubber washer and two ends of the washer have respective pins. The two pins are inserted into a central through hole of the joint and the central through hole of the thread post. The central through holes of the joint and the thread post are retained with a predetermined distance.

REFERENCES:
patent: 514900 (1894-02-01), Black
patent: 3131646 (1964-05-01), Parrott
patent: 5478216 (1995-12-01), Neward
patent: 5498246 (1996-03-01), Deutchman et al.
patent: 5620314 (1997-04-01), Worton
patent: 5655890 (1997-08-01), Liao

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