Work tool
AssigneeMakita Corporation
InventorHiroki Ikuta
Life of this patent
Estimating the term…
Abstract
A work tool includes a motor, a tool-mounting part, a rotary shaft, a rotating member, a switch, an operation member and a lock mechanism. The rotating member is held rotatably around a rotation axis of the rotary shaft and configured to transmit torque to and from the rotary shaft while being allowed to rotate relative to the rotary shaft. The rotating member is configured to rotate together with the rotary shaft by action of transmitting the torque when the operation member is moved from the OFF position to the ON position and the lock mechanism allows the rotating member to rotate, and configured to apply a braking force to the rotary shaft by action of transmitting the torque when the operation member is moved from the ON position to the OFF position and the lock mechanism non-rotatably locks the rotating member.
Claims12
A work tool configured to rotationally drive a tool accessory, the work tool comprising:
- a motor;
- a tool-mounting part configured to removably receive the tool accessory and to rotate by power of the motor;
- a rotary shaft configured to rotate around a rotation axis with the tool-mounting part by the power of the motor;
- a rotating member configured to have first and second modes of operation, the first mode of operation is that the rotating member rotates around the rotation axis with the rotary shaft and the second mode of operation is that the rotary shaft is allowed to rotate relative to the rotating member;
- a switch configured to operate the motor;
- an operation member configured to move between an ON position and an OFF position according to an external depressing operation, the operation member in the ON position holding the switch in an ON state and the operation member in the OFF position holding the switch in an OFF state;
- and
- a lock mechanism configured to allow the rotating member to rotate around the rotation axis when the operation member is in the ON position and to prevent the rotating member from rotating around the rotation axis when the operation member is in the OFF position, wherein:
- the rotary shaft and the rotating member are configured to transmit torque between the rotary shaft and the rotating member;
- the rotating member is configured to (1) rotate with the rotary shaft in the first mode of operation by action of transmitting the torque when the operation member is moved from the OFF position to the ON position and the lock mechanism allows the rotating member to rotate and (2) apply a braking force to the rotary shaft in the second mode of operation by action of transmitting the torque when the operation member is moved from the ON position to the OFF position and the lock mechanism prevents rotation of the rotating member.
A work tool configured to rotationally drive a tool accessory, the work tool comprising:
- a motor;
- a tool-mounting part configured to removably receive the tool accessory and to rotate by power of the motor;
- a rotary shaft configured to rotate around a rotation axis with the tool-mounting part by the power of the motor;
- a switch configured to operate the motor;
- an operation member configured to move between an ON position and an OFF position according to an external depressing operation, the operation member in the ON position holding the switch in an ON state and the operation member in the OFF position holding the switch in an OFF state;
- and
- a brake system configured to brake the rotary shaft, wherein:
- the brake system includes a first brake mechanism and a second brake mechanism configured to operate in series,
- the first brake mechanism is configured to actuate the second brake mechanism in interlock with movement of the operation member from the ON position to the OFF position,
- the second brake mechanism is configured to be actuated by the first brake mechanism to apply a braking force to the rotary shaft
- the second brake mechanism is a frictional brake mechanism including a first frictional-engagement part and a second frictional-engagement part, the first frictional-engagement part is configured to rotate with the rotary shaft and the second frictional-engagement part is normally held in contact with the first frictional-engagement part,
- the first brake mechanism is a lock mechanism including an engagement member configured to be engageable with the second frictional-engagement part,
- the engagement member is configured to stop rotation of the second frictional-engagement by engaging the second frictional-engagement part in interlock with movement of the operation member from the ON position to the OFF position, and
- the second frictional-engagement part is configured to apply the braking force to the rotary shaft via the first frictional-engagement part when the engagement member stops rotation of the second frictional-engagement part.
Dependencies are inferred from the claim text.