Combustion type power tool having buffer piece

Details Combustion type power tool having buffer piece Combustion type power tool having buffer piece

2008-01-08

2008-01-08

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Free piston

Single chamber; one piston

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.

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