Variable speed gearing in rotary electric tool
US4892013A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1988 |
| Grant date | Jan 9, 1990 |
| Priority date | — |
| Expiry date | Jun 29, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H3/74
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A variable speed gearing apparatus for a rotary electric tool, including a differential gear mechanism for being mounted within a gear case, an intermediate gear and a clutch mechanism, a final planetary gear mechanism having internal gear with projections formed on the outer peripheral surface of the internal gear in the differential gear mechanism, a torque-setting cam arranged so that said projections of the internal gear of the final planetary gear mechanism are capable of being engaged with and disengaged from the torque-setting cam a first planetary gear mechanism having an internal gas, wherein the outer peripheral surface of the internal gear of the first planetary gear mechanism in the differential gear mechanism is tapered, a brake disk having a tapered surface corresponding to the tapered surface of the internal gear of the first planetary gear mechanism, the brake disk being arranged to be axially movable to be brought into pressure contact through the tapered surface of the brake disk with the tapered surface of the internal gear of the first planetary gear mechanism movably in a rotation-stopped condition, the brake disk being arranged so that it can be interlocked ag…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.