Combustion type power tool having buffer piece

Internal-combustion engines – Free piston – Single chamber; one piston

Reexamination Certificate

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Details

C227S010000

Reexamination Certificate

active

07316209

ABSTRACT:
A combustion-type power tool includes a housing, a cylinder disposed, a piston, and a cylinder head disposed at an end of the housing and having a wall portion extending in a direction perpendicular to an axial direction, the wall portion having an opening. A motor is disposed at the cylinder head and includes a motor body and a drive shaft extending from the motor body into a combustion chamber through the opening of the wall portion of the cylinder head, a fan is connected to the drive shaft to be rotatable within the combustion chamber, and an elastic member is disposed at the opening of the wall portion and has a sleeve portion extending in the axial direction. The sleeve portion has a through-hole through which the drive shaft extends, and an inner surface of the through-hole is tapered with respect to an outer surface of the drive shaft.

REFERENCES:
patent: 2403034 (1946-07-01), Weyandt et al.
patent: 4403722 (1983-09-01), Nikolich
patent: 4483280 (1984-11-01), Nikolich
patent: 5203093 (1993-04-01), Baker
patent: 5713313 (1998-02-01), Berry
patent: 5959379 (1999-09-01), Hu
patent: 6619527 (2003-09-01), Moeller
patent: 7040520 (2006-05-01), Turk
patent: 7073468 (2006-07-01), Akiba
patent: 2004/0173657 (2004-09-01), Turk
patent: 2005/0173485 (2005-08-01), Moeller
patent: 2005/0218179 (2005-10-01), Akiba
patent: 2005/0225184 (2005-10-01), Akiba
patent: 2006/0186166 (2006-08-01), Akiba
patent: 1 197 300 (2002-04-01), None
patent: 1 488 891 (2004-12-01), None
patent: 1 588 804 (2005-10-01), None

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