Brake arrangement for a chain saw
US4594780A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1984 |
| Grant date | Jun 17, 1986 |
| Priority date | — |
| Expiry date | Jul 6, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/11
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The invention is directed to a braking arrangement for a chain saw having a housing and a guide bar mounted on the housing for accommodating a saw chain thereon. The brake arrangement includes a brake drum operatively connected to the saw chain with a brake band disposed in surrounding relationship thereto. A brake member is connected to the brake band and moves between a ready position whereat the brake band is disposed in spaced relationship to the brake drum and a released position whereat the brake band is drawn tightly around the brake drum. A brake spring resiliently biases the brake member to cause the brake member to pull the brake band tightly about the brake drum when in the released position. A latch arrangement holds the brake member in the ready position against the force of the brake spring. A cam connected to the drive motor rotates through a predetermined path. A release device opens the latch arrangement to permit rotational movement of the brake member to the released position and releases a tensioning member for movement into the path of the cam when the brake member is in the second position whereat the tensioning member follows the cam in a movement that causes…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.