Powered ratchet wrench
US4480510A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1981 |
| Grant date | Nov 6, 1984 |
| Priority date | — |
| Expiry date | Sep 28, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/214
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A powered ratchet wrench for turning threaded members, such as nuts or bolt heads, consists of a wrench assembly having a reaction arm adapted to be positioned over a threaded member, viz. nut or bolt, for supporting the same and operating a socket wrench through a ratchet mechanism applying a torque for tightening or loosening the nuts or bolts. The wrench assembly has a box shaped housing with an open end portion supporting a ratchet mechanism and a double-acting fluid operated cylinder having an operating piston extending therefrom for operating the ratchet mechanism. The ratchet mechanism consists of a ratchet wheel supported between two plates on bearing sleeves extending from side to side at the open end portion of the housing. A pair of pawls with driving teeth engage opposite sides of the ratchet wheel and are spring biased toward engagement with the ratchet teeth. The pawls are pivotally supported on each other and on the ratchet wheel supporting plates. The operating cylinder is supported on the housing with its piston secured to one of the pawls for driving the pawls to rotate the ratchet wheel on extension of the piston and to rotate the pawls in a ratcheting movement r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.