Impact tool
AssigneeMakita Corporation
InventorsHikaru KAMEGAI, Takuro KONISHI
Life of this patent
Estimating the term…
Abstract
A hammer drill includes, in a cylinder accommodated in a housing, a piston configured to advance and retract and an impact element to operate together with the piston with an air chamber interposed therebetween, and a bit mounted in a front part of a tool main body so that an impact operation can be transmitted to the bit by advancing and retracting movement of the impact element. Vent holes are provided in the cylinder, and configured to discharge air in the air chamber to outside of the cylinder, and to introduce the air outside the cylinder into the air chamber by the movement of the piston. One of the vent holes is located at a center of an upper half of a periphery of the cylinder and the other vent hole is located in a lower half of the periphery of the cylinder.
Claims9
An impact tool, comprising:
- a housing;
- a cylinder accommodated in the housing;
- a piston configured to advance and retract in the housing;
- an impact element configured to operate together with the piston with an air chamber interposed therebetween in the housing;
- a bit mounted in a front part of a tool main body, and configured so that an impact operation can be transmitted to the bit by advancing and retracting movement of the impact element;
- and
- a vent hole provided in the cylinder, and configured to discharge air in the air chamber to outside of the cylinder by the advancing movement of the piston, and to introduce the air outside the cylinder into the air chamber by the retracting movement of the piston, wherein
- a plurality of the vent holes are formed along a circumferential direction of the cylinder, and at least two of the vent holes are arranged so that one of the vent holes is located at a center of one half of a periphery of the cylinder and the other vent hole is located in the other half of the periphery of the cylinder.
Dependencies are inferred from the claim text.