Combustion-type power tool having cooling arrangement

Details Combustion-type power tool having cooling arrangement Combustion-type power tool having cooling arrangement

2007-07-03

2007-07-03

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Free piston

Single chamber; one piston

C227S010000

Reexamination Certificate

active

11208593

ABSTRACT:
A combustion-type power tool having a cooling arrangement for cooling a cylinder. The tool includes a housing, a cylinder head at one end of the housing, a push lever disposed at another end of the housing, and a combustion chamber frame including a base section and a head section. The head section has a disc like connecting portion extending from an end of the base section and a sleeve like abutment section extending from the connecting portion toward a cylinder head. A fan is disposed in a combustion chamber and is fixed to a rotation shaft of a motor supported to the cylinder head. The fan has fan blades. The fan blades define a widthwise center line in the axial direction of the rotation shaft. The center line is offset from the connecting portion and toward the push lever. The fan blades define widthwise edges in confrontation with the cylinder head. The widthwise edge is positioned in alignment with the connecting portion or offset therefrom toward the cylinder head.

REFERENCES:
patent: 4522162 (1985-06-01), Nikolich
patent: 5197646 (1993-03-01), Nikolich
patent: 6145724 (2000-11-01), Shkolnikov
patent: 6796476 (2004-09-01), Birk et al.
patent: 6889885 (2005-05-01), Ohmori
patent: 0 857 546 (1998-08-01), None
patent: 1 391 270 (2004-02-01), None

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