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US 7,225,768 B2Granted
Combustion type power tool having buffer piece
AssigneeHitachi Koki Co., Ltd.
InventorsYoshitaka Akiba, Haruhisa Fujisawa, Tomomasa Nishikawa
Life of this patent
Estimating the term…
Abstract
A combustion type power tool having an arrangement avoiding direct striking of a drive shaft against a cylinder head when combustion pressure is exerted. A motor is disposed at the cylinder head and includes a motor body and a drive shaft extending in an axial direction and protruding into a combustion chamber. A fan is connected to the drive shaft to be rotatable within the combustion chamber. A buffer piece made from an elastic material is supported to the cylinder head. The buffer piece is movable relative to the cylinder head in a direction substantially perpendicular to the axial direction. The buffer piece is formed with a through-hole through which the drive shaft extends.
Claims21
A combustion-type power tool comprising:
- a housing having one end and another end and defining a longitudinal direction;
- a cylinder head disposed at the one end;
- a cylinder disposed in and fixed to the housing;
- a piston reciprocally movable in the longitudinal direction and slidable relative to the cylinder, the piston dividing the cylinder into an upper space above the piston and a lower space below the piston;
- a combustion-chamber frame disposed in the housing and movable in the longitudinal direction, the combustion chamber frame being abuttable on the cylinder head to provide a combustion chamber in cooperation with the cylinder head and the piston;
- a motor disposed at the cylinder head and comprising a motor body and a drive shaft extending from the motor body in the longitudinal direction and protruding into the combustion chamber;
- a fan connected to the drive shaft to be rotatable within the combustion chamber;
- and
- a buffer piece made from an elastic material and supported to the cylinder head, the buffer piece being movable relative to the cylinder head, the buffer piece being formed with a through-hole through which the drive shaft extends.
6 more elements
A combustion-type power tool comprising:
- a housing;
- a cylinder disposed at the one end;
- a cylinder head being disposed at one end of housing;
- a piston movable disposed in the cylinder;
- a motor disposed at the cylinder head and comprising a motor body and a drive shaft extending from the motor body into a combustion chamber;
- a fan connected to the drive shaft to be rotatable within the combustion chamber;
- and
- an elastic member supported to the cylinder head and movable relative to the cylinder head, the elastic member being formed with a through-hole through which the drive shaft extends;
- wherein the elastic member comprises:
- a sleeve portion having one end directing toward the motor body and an other end directing toward the combustion chamber;
- a first flange integrally connected to the one end of the sleeve portion;
- and
- a second flange integrally connected to the other end of the sleeve portion, the through-hole being formed through the sleeve portion, the first flange and the second flange.
10 more elements
A combustion-type power tool comprising:
- a housing;
- a cylinder disposed in the housing;
- a cylinder head being disposed at one end of the housing;
- a piston disposed in the cylinder movable in an axial direction;
- a motor disposed at the cylinder head and comprising a motor body and a drive shaft;
- and
- a buffer piece disposed at the cylinder head, the buffer piece being movable relative to the cylinder head in a direction substantially perpendicular to the axial direction, the buffer piece being formed with a through-hole through which the drive shaft extends.
4 more elements
A combustion-type power tool comprising:
- a housing having one end and another end and defining a longitudinal direction;
- a cylinder head disposed at the one end;
- a cylinder disposed in and fixed to the housing;
- a piston reciprocally movable in the longitudinal direction and slidable relative to the cylinder, the piston dividing the cylinder into an upper space above the piston and a lower space below the piston;
- a combustion-chamber frame disposed in the housing and movable in the longitudinal direction, the combustion chamber frame being abuttable on the cylinder head to provide a combustion chamber in cooperation with the cylinder head and the piston;
- a motor disposed at the cylinder head and comprising a motor body and a drive shaft extending from the motor body in the longitudinal direction and protruding into the combustion chamber;
- a fan connected to the drive shaft to be rotatable within the combustion chamber;
- a buffer piece made from an elastic material and supported to the cylinder head, the buffer piece being movable relative to the cylinder head, the buffer piece being formed with a through-hole through which the drive shaft extends, the through hole having a minimum inner diameter;
- and
- a washer disposed in the buffer piece and having an inner diameter smaller than the minimum inner diameter.
7 more elements
A combustion-type power tool comprising:
- a housing;
- a cylinder disposed in the housing;
- a cylinder head being disposed at one end of the housing;
- a piston movable disposed in the cylinder;
- a motor disposed at the cylinder head and comprising a motor body and a drive shaft extending from the motor body into a combustion chamber;
- a fan connected to the drive shaft to be rotatable within the combustion chamber;
- and
- an elastic member supported to the cylinder head and movable relative to the cylinder head, the elastic member being formed with a through-hole through which the drive shaft extends.
5 more elements
A combustion-type power tool comprising:
- a housing;
- a cylinder disposed in the housing;
- a cylinder head being disposed at one end of the housing;
- a piston movable disposed in the cylinder;
- a motor disposed at the cylinder head and comprising a motor body and a drive shaft extending from the motor body into a combustion chamber;
- a fan connected to the drive shaft to be rotatable within the combustion chamber;
- an elastic member supported to the cylinder head and movable relative to the cylinder head, the elastic member being formed with a though-hole through which the drive shaft extends, the through-hole having a minimum inner diameter;
- and
- a washer disposed in the elastic member and having an inner diameter smaller than the minimum inner diameter.
6 more elements
Dependencies are inferred from the claim text.