| 主权项 |
1. A power tool, which performs a prescribed operation on a workpiece by linearly moving a tool accessory, comprising:
a body, which body houses: a tool holder for holding the tool accessory, a driving motor, a rotary shaft member that is rotationally driven by the driving motor, and a striking mechanism that linearly drives the tool accessory along with rotation of the rotary shaft member, wherein the striking mechanism includes: a cylinder that is configured to be allowed to linearly reciprocate, a striking element that is housed within the cylinder and configured to be allowed to linearly reciprocate within the cylinder, an air chamber that is defined by the striking element and the cylinder, a swinging mechanism that is connected to the cylinder and reciprocates the cylinder by swinging along with rotation of the rotary shaft member, and an intermediate element that is housed within the tool holder and configured to be allowed to linearly reciprocate, and the power tool is configured to cause the striking element to collide with the intermediate element via pressure fluctuations caused in the air chamber by reciprocating movement of the cylinder and to further cause the intermediate element to collide with the tool accessory, thereby linearly moving the tool accessory, wherein: the power tool defines a longitudinal direction parallel to a cylinder moving axis and a transverse direction crossing the longitudinal direction, the longitudinal direction defines a first side to which the cylinder compresses air of the air chamber, and a second side opposite to the first side, the body further houses a volume compensation mechanism for compensating the volume of the air chamber, the volume compensation mechanism includes a first compensation mechanism and a second compensation mechanism, the first compensation mechanism is configured to allow the swinging mechanism to reciprocate between a swinging mechanism reference position located on the first side and a swinging mechanism moving position located on the second side, and has a first biasing member that biases the swinging member so as to place the swinging mechanism in the swinging mechanism reference position when the swinging mechanism is placed in the swinging mechanism moving position, the second compensation mechanism is configured to allow the intermediate element to reciprocate between an intermediate element reference position located on the first side and an intermediate element moving position located on the second side, and has a second biasing member that biases the intermediate element so as to place the intermediate element in the intermediate element reference position when the intermediate element is placed in the intermediate element moving position, the volume compensation mechanism is further configured such that: the first compensation mechanism moves the swinging mechanism from the swinging mechanism reference position to the swinging mechanism moving position by a reaction force generated by movement of the cylinder from the second side to the first side, and moves the cylinder to the second side along with the movement of the swinging mechanism, thereby increasing the volume of the air chamber, and in the state that the volume of the air chamber is increased by the first compensation mechanism, the second compensation mechanism moves the intermediate element from the intermediate element reference position to the intermediate element moving position by a reaction force generated by the predetermined operation of the tool accessory, and moves the striking element to the second side along with movement of the intermediate element, thereby compensating the volume of the air chamber. |
