Chain saw
US4178685A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 21, 1978 |
| Grant date | Dec 18, 1979 |
| Priority date | — |
| Expiry date | Jul 21, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2075/1808
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A chain saw driven by a two-cycle opposed cylinder engine of simultaneous ignition type. The vibration energies generated in respective cylinders are offset by each other partly because the cylinders are made to oppose to each other, and partly because the ignitions of these cylinders take place simultaneously. Further, the opposed cylinder engine provides ample spaces above and below the cylinders. These spaces are conveniently used for accommodating intake system including a carburetor and so forth and exhaust system including a muffler and so forth. Sound shielding walls are disposed in the ample space around the cylinders so as to insulate the noise caused by the engine and, at the same time, to define a sufficiently large cooling air passage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.