Rotary impact apparatus
US4805706A · kind A · utility
Inventor
Key dates
| Filing date | Aug 12, 1987 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Aug 12, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D43/16
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A rotary impact apparatus comprises an input shaft capable of attachment to an electric drill and arranged to drive an impact assembly through a cone clutch and an output shaft capable of being driven by the impact assembly. The clutch is adjustable by means of a nut and a spring to vary the torque at which drive to the output shaft is disengaged. The impact assembly comprises two rockers adopted to drive the output shaft in respective directions. Each rocker is biased out of engagement with the output shaft by a rocker spring but is unbalanced and rotation of the impact assembly through the clutch by the input shaft creates a centrifugal force on it against the rocker spring whereby it engages the output shaft to rotate the output shaft until resistance to rotation is such that the clutch disengages and rotation of the impact assembly stops. The rocker spring then biases the rocker out of engagement with the output shaft, thereby allowing the clutch and impact assembly free rotation until the sequence is repeated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.