Air operated grease gun

Details Air operated grease gun Air operated grease gun

1997-08-11

1998-07-14

Shaver, Kevin P.

Dispensing

With discharge assistant

Plural

G01F 1100

Patent

active

057791058

ABSTRACT:
An automatic air operated grease gun comprising a reciprocating grease plunger for ejecting grease, and a piston, connected to the plunger, for operating the plunger. The piston is slidably mounted in a cylinder to move between a retracted position and an advanced position. A return spring resiliently biases the piston to its retracted position. A switch selectively connects the cylinder to a source of gas under pressure to advance the piston against the return spring. The piston has a plurality of apertures therein, each aperture having an individual seal, and a release for opening the individual seals to relieve the pressure behind the cylinder and allow it to retract under the force of the return spring.

REFERENCES:
patent: 1856372 (1932-05-01), Buchet
patent: 1918833 (1933-07-01), Carter
patent: 1939943 (1933-12-01), Barks
patent: 1949497 (1934-03-01), Stafford et al.
patent: 2113333 (1938-04-01), Piquerez
patent: 2134735 (1938-11-01), Reinhold
patent: 2505839 (1950-05-01), Scovell
patent: 4298144 (1981-11-01), Pressl

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