Title: Hydraulic wrench

Abstract: A hydraulic wrench has a support, and a drive assembly which is mounted thereon and which includes a shaft that is turnable, a pair of sector drive plates which are mounted on the shaft turnable relative to the same and spaced from one another, each drive plate having an arcuate edge face formed with a plurality of slots that are spaced about the axis of the shaft and extend substantially parallel to this axis, and a square drive member which is turnable with the shaft and can be inserted into a mating drive socket. A transmission arrangement transmits motion from the sector drive plates to the shaft in order to turn the latter when the sector drive plates are turned. A hydraulic cylinder unit is also mounted on the support for pivotal movement about an axis parallelling that of the shaft and spaced therefrom, and the cylinder unit has a reciprocable piston rod having a working stroke and being provided with a projection that can engage in the respective slots of the sector drive plates, in order to turn the latter during the working stroke of the piston rod.

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Inventors: Keller, Philip J. (Pompton Plains, NJ, US)

Application Number: 498246
Filing Date: 1974-08-16
Publication_date: 1976-01-06
Assignee: Unex Corporation (Montclair, NJ)
Primary Class(es): 173/218 74/128, 74/156, 81/57.39
Other Classes:
US Patent Ref:

2573469	Oct, 1951	Maclay	74/156.
2758569	Aug, 1956	Peterson	74/128.
2844982	Jul, 1958	Swenson	173/93.
3706244	Dec, 1972	Wilmeth	81/57.
3791230	Feb, 1974	Webb	74/128.

Other Refs:
Primary Examiner: Abbott, Frank L.
Assistant Examiner: Pate, III, William F.
Attorney: Striker; Michael S.