Hydraulic wrench
US3930776A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 16, 1974 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | Aug 16, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/1577
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.