US 2006/0231576 A1Published application

Two stage grease gun

AssigneeWeems Industries, Inc., d/b/a Legacy Manufacturing Company

InventorsDon Linkletter, R. Weems

Life of this patent

Estimating the term…

Loading patent…

Abstract

A portable grease gun with a dual pressure output capability which can be selectively changed by the user with little effort. The larger diameter plunger is slidable within a plunger retainer. The larger diameter plunger has a bore through them in which a smaller diameter plunger is slidable. The smaller diameter plunger moves when an actuating lever is operated to compress grease in the grease gun. The larger diameter plunger may be adjusted to remain static during operation of the actuating lever or it may be adjusted to move during all or part of the compression stroke of the actuating lever. A high pressure can be generated by movement of the smaller diameter plunger alone, or a high flow volume can be generated by movement of the smaller and larger diameter plungers in unison.

Claims1

Dependent claims

A grease gun comprising

a grease gun body having a passageway therethrough,
an actuating lever pivotal upon the grease gun body,
a first plunger longitudinally slidable within the passageway over a limited distance,
the first plunger having a longitudinal passageway therethrough,
a second plunger rotatably received in the longitudinal passageway of the first plunger, the second plunger being rotatable between a high pressure orientation wherein the second plunger will slide within the first plunger and a nominal orientation wherein the second plunger moves in unison with the first plunger,
movement of the actuating lever from a retracted position towards a closed position with the second plunger in a high pressure orientation effects movement of the second plunger within the coaxial bore,
movement of the actuating lever from the retracted position towards the closed position with the second plunger in a nominal orientation effects movement of the first and second plungers in unison.

4 more elements

Dependencies are inferred from the claim text.