Patent US4382333A successfully refreshed from Google Patents.
US4382333A
Expired / Lapsed
US
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Chain saw
Assignee: Kioritz Corp
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Filing: 1981-09-11
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Granted: 1983-05-10
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Expires: 2001-09-11
Abstract
Abstract A chain saw having a saw chain adapted to be driven by an engine. The engine has a cylinder and a crank case separable from each other. The crank case has cooling air guide walls formed integrally therewith and extending along the upper and lower sides of the cylinder.
Inventors
- 👤 Akira Nagashima
- 👤 Yasuo Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:19
CPC Classifications
F; F02; F02B; F02B63/00; F02B63/02; B; B27; B27B; B27B17/00; B27B17/0008; F01; F01P; F01P1/00; F01P1/02; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A chain saw having a frame, a saw chain mounted of said frame in such a manner as to run along a predetermined path and an engine mounted on said frame and adapted to drive said saw chain, characterized in that said engine includes a crank case and a cylinder detachably secured to said crank case and arranged horizontally with its head directed rearwardly, and that said crank case has cooling air guide walls formed unitarily therewith and extended along the upper and lower sides of said cylinder, said cooling air guide walls defining a cooling air passage opened at its one side to the atmosphere and communicated at its other end with the air outlet of a cooling fan, the rear side of said cooling air passage facing said head being closed by an end cover secured to the rear ends of said cooling air guide walls, said end cover being detachable from said cooling air guide walls to permit the withdrawal of said cylinder after detaching of said cylinder from said crank case.
Claim 2
Dependent Claim
175 words
A chain saw having a frame, a saw chain mounted of said frame in such a manner as to run along a predetermined path and an engine mounted on said frame and adapted to drive said saw chain, characterized in that said engine includes a crank case and a cylinder detachably secured to said crank case and arranged horizontally with its head directed rearwardly, and that said crank case has cooling air guide walls formed unitarily therewith and extended along the upper and lower sides of said cylinder, said cooling air guide walls defining a cooling air passage opened at its one side to the atmosphere and communicated at its other end with the air outlet of a cooling fan, the rear side of said cooling air passage facing said head being closed by an end cover secured to the rear ends of said cooling air guide walls, said end cover being detachable from said cooling air guide walls to permit the withdrawal of said cylinder after detaching of said cylinder from said crank case.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |