Clutch-brake mechanism for rotary mower engines
US4205737A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1977 |
| Grant date | Jun 3, 1980 |
| Priority date | — |
| Expiry date | Sep 2, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D2101/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A completely enclosed combination clutch and brake mechanism permanently mounted at the bottom of a vertical shaft internal combustion engine of the type used to power rotary lawn mowers, is interposed between the crankshaft of the engine and a coaxial blade shaft projecting down from the bottom of the enclosed clutch and brake mechanism to have the cutting blade of the mower fixed thereto. A rotatable driving member fixed to the engine crankshaft and a rotatable driven member fixed to the blade shaft are drivingly coupled by radially outwardly movable clutch elements carried by the driven member and frictionally engaged with a radially inwardly facing circular surface on the driving member. Such frictional engagement results from the application to the clutch elements of both spring force and centrifugal force. The spring-force-produced frictional engagement effects transmission of rotation to the driven member from stand still to the speed at which the centrifugal-force-produced frictional engagement is capable of transmitting full engine torque to the blade shaft, but is incapable--due to slippage--of stopping the engine when the brake is applied, in which event rotation of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.