Sprocket nose guide bar for chain saws
US4970789A · kind A · utility
8Cited by
4References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1989 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Oct 6, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB27B17/04
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A sprocket nose guide bar for guiding an endless saw chain. A configured sprocket is rotatably mounted in the nose of the bar and functions to elevate and transport the saw chain around the nose end. The teeth of the sprocket engage the drive links of the chain to lift the chain off the nose edge as the chain traverses the nose. The tooth tips project above the side link bearing surfaces and into configured notches whereby the teeth effectively provide the lifting action without entering the saw chain chassis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.