# US 4,393,589 A · Construction for a motor-driven chain saw

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- Number: US 4,393,589 A
- Document ID: US4393589A
- Status: Granted
- Kind: A
- Application number: 06/270,793
- Filed: 1981-06-05
- Granted: 1983-07-19
- Earliest claimed: 1980-06-09
- Assignees: EMAB Electrolux Motor Aktiebolag
- Inventors: Bengt A. Barkhult
- Web page: https://patentgrep.com/patent/US4393589A

## CPC

- B27B 17/00: Chain saws; Equipment therefor {(slotting or mortising machines equipped with chain cutters B27F5/06)}
- 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)

## Abstract

A motor-driven chain saw having a plurality of units including an engine-saw unit, a casing, a multiplicity of fuel tanks, and filter elements for fuel and lubricant. The filter-tank unit is provided with a top portion and a bottom portion which restricts spacings for a direct location of the filter elements. The filter-tank unit is provided with a fixed pipe system for the fuel and lubricant between the spacings and the auxiliary apparatus constituting a carburetor and lubricant pump.

## Claims

### Claim 1

A chain saw having an oil pump and a carburetor comprising: a plurality of units including an engine-saw unit, a casing, a fuel tank, a fuel filter for said fuel tank forming a filter-tank unit, said filter-tank unit including a top portion and a bottom portion restricting spacings for oil and fuel, respectively, and enclosing said filter, a plurality of pipes molded and permanently mounted in said top portion for oil and fuel from the respective tanks to said oil pump and carburetor, said carburetor which is located on said top portion and is provided with an air filter, and a permanently formed and molded holder in said top portion for holding said filter.

### Claim 2 (depends on 1)

A chain saw as claimed in claim 1 further comprising an oil pump located on said top portion.

### Claim 3 (depends on 1)

A chain saw as claimed in claim 1 wherein said top portion is provided with a semi-cylindrical cavity constituting the lower half of the crank case of the engine.

### Claim 4 (depends on 3)

A chain saw as claimed in claim 3 wherein said engine-saw unit and said filter-tank unit are joined by means of screws.

### Claim 5 (depends on 1)

A chain saw as claimed in claim 1 wherein said casing is provided with front and rear handles, and said filter-tank unit constitutes an intermediate portion between the engine saw unit and said handles.

### Claim 6 (depends on 4)

A chain saw as claimed in claim 4 further comprising an intake manifold in said top portion and disposed between said carburetor and said crank case.