Combustion type power tool having buffer piece

1. 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.

2. The combustion-type power tool as claimed in claim 1 , wherein the buffer piece is made from a rubber.

3. The combustion-type power tool as claimed in claim 1 , further comprising:

a nose positioned at the another end and extending from the cylinder;

a push lever movable along the nose in the longitudinal direction upon pressure contact with a workpiece, the combustion chamber frame being movable in interlocking relation to the push lever;

an ignition plug supported to the cylinder head and exposed to the combustion chamber; and

a bumper disposed in the cylinder to which the piston is abuttable.

4. 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.

5. The combustion-type power tool as claimed in claim 4 , wherein the cylinder head has a buffer support section having a first surface directing toward the motor body and a second surface opposite to the first surface and directing toward the combustion chamber, and is formed with a central hole having an inner diameter; and

wherein the sleeve portion having an outer diameter smaller than the inner diameter to provide an annular gap between the sleeve portion and the buffer support section; and

wherein the first flange is seatable on the first surface and the second flange is seatable on the second surface.

6. The combustion-type power tool as claimed in claim 5 , wherein the elastic member further comprises a projection protruding from the first flange toward the first surface to maintain sealing relation between the buffer support section and the elastic member.

7. The combustion-type power tool as claimed in claim 5 , wherein the elastic member further comprises a projection protruding from the second flange toward the second surface to maintain sealing relation between the buffer support section and the buffer piece.

8. The combustion-type power tool as claimed in claim 3 , wherein the sleeve portion, the first flange, and the second flange have a circular cross-section.

9. The combustion-type power tool as claimed in claim 5 , wherein the sleeve portion has opposing parallel sides and another opposing arcuate sides in cross-section, and

wherein the center hole of the buffer support section has a shape the same as but greater than the cross-sectional shape of the sleeve portion.

10. The combustion-type power tool as claimed in claim 5 , wherein the through-hole has a minimum inner diameter, and the combustion-type power tool further comprising a washer disposed in the elastic member and having an inner diameter smaller than the minimum inner diameter.

11. The combustion-type power tool as claimed in claim 10 , wherein the inner diameter of the washer is greater than an outer diameter of the drive shaft.

12. The combustion-type power tool as claimed in claim 11 , wherein the through-hole has a tapered shape with a first open end directed to the motor body and having a first inner diameter, and with a second open end directed to the combustion chamber and having a second inner diameter smaller than the first inner diameter, the second inner diameter being the minimum inner diameter.

13. The combustion-type power tool as claimed in claim 10 , wherein the washer is concentrically supported to the second flange.

14. The combustion-type power tool as claimed in claim 10 , wherein the washer is made from a metal.

15. The combustion-type power tool as claimed in claim 5 , wherein the through-hole has a tapered shape with a first open end directing toward the motor body and having a first inner diameter, and with a second open end directing toward the combustion chamber and having a second inner diameter smaller than the first inner diameter.

16. 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.

17. The combustion-type power tool as claimed in claim 16 , wherein the buffer piece comprises:

a sleeve portion having one end and an other end;

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.

18. The combustion-type power tool as claimed in claim 17 , wherein the cylinder head has a buffer support section having a first surface directing toward the one end and a second surface opposite to the first surface and directing toward the other end, and is formed with a central hole having an inner diameter; and

wherein the sleeve portion has an outer diameter smaller than the inner diameter to provide an annular gap between the sleeve portion and the buffer support section; and

wherein the first flange is seatable on the first surface and the second flange is seatable on the second surface.

19. 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.

20. 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.

21. 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.