Controlled torque output tool
US4155275A · kind A · utility
Inventor
Key dates
| Filing date | Sep 15, 1976 |
| Grant date | May 22, 1979 |
| Priority date | — |
| Expiry date | Sep 15, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19637
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A torque tool has a shaft which is driven by an input motor to transmit torque through an output gear. Reactive torque generated in reaction to the output torque is transmitted through a floating reaction ring gear to a brake assembly by means connecting the floating or rotatable ring gear to the brake assembly. The brake assembly is retained against rotation by resilient spring means of a preselected rotation resistance strength. Upon attainment of a preselected output torque and concomitant reactive torque, the brake assembly is shifted against the resistance offered by the springs so that the brake assembly contacts and brakes the shaft to limit the torque transmitted thereby. The means connecting the rotating ring gear to the brake assembly may include additional gear means designed to take up a portion of the reactive torque so that only a preselected balance of the total reactive torque is available to overcome the resistance offered by the resilient springs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.