# US 4,382,333 A · Chain saw

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- Number: US 4,382,333 A
- Document ID: US4382333A
- Status: Granted
- Kind: A
- Application number: 06/301,171
- Filed: 1981-09-11
- Granted: 1983-05-10
- Earliest claimed: 1980-03-31
- Assignees: Kioritz Corporation
- Inventors: Akira Nagashima; Yasuo Saito
- Web page: https://patentgrep.com/patent/US4382333A

## CPC

- F02B 63/02: for hand-held tools
- B27B 17/00: Chain saws; Equipment therefor {(slotting or mortising machines equipped with chain cutters B27F5/06)}
- B27B 17/0008: {Means for carrying the chain saw, e.g. handles (B27B17/0033 takes precedence)}
- F01P 1/02: Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders
- F02B 2075/025: {two}
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- B27B: SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR (saws specially adapted for pruning or debranching A01G3/08; sawing apparatus specially adapted for felling trees A01G23/091; features not restricted to a particular type of wood saw B23D, e.g. attaching saw blades B23D51/00; machine tool frames, beds, pillars or like members, in general B23Q1/01)
- F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28)

## 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.

## Claims

### Claim 1

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.