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US 10,312,653 B2Granted
Hydraulic tool
AssigneeMilwaukee Electric Tool Corporation
InventorsJames G. Ballard, Joseph H. Ellice, Eric Norquist
Life of this patent
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Abstract
A hydraulic tool. The hydraulic tool includes a tool working end and a tool main section operably coupled to the tool working end. The tool main section comprising a ram assembly, the ram assembly includes a pretensioned return spring. A tool transmission end is operably coupled to the tool main section for hydraulically operating the tool working end.
Claims19
A hydraulic tool comprising:
- a tool working end;
- a tool main section operably coupled to the tool working end, the tool main section comprising a ram assembly, the ram assembly comprising a variable, pretensioned return spring surrounding an outer surface of a ram piston disposed in a main ram chamber, wherein the pretensioned return spring comprises a spring loop coupled to a pin disposed in a fluid passage, wherein the pin is a hollow passage pin having a hollow passage that fluidly couples the main ram chamber to the fluid passage;
- and
- a tool transmission end operably coupled to the tool main section for hydraulically driving the tool working end.
1 more element
Dependencies are inferred from the claim text.