Impact tool
AssigneeMakita Corporation
InventorYasuhito Kawai
Life of this patent
Estimating the term…
Abstract
An impact driver includes a motor, a spindle, a hammer externally and coaxially mounted on the spindle to receive rotation of the spindle and move relative to the spindle in an axial direction, an anvil in front of the hammer and coaxial with the spindle to be struck by the hammer in a rotation direction, and a hammer case accommodating the spindle, the hammer, and the anvil, allowing a front end of the anvil to protrude frontward from the hammer case, and filled with grease. The spindle includes a grease supply path located in the spindle and open in a sliding surface of the spindle on which the hammer slides to allow grease to be supplied to the sliding surface, and an accelerator in the spindle to accelerate a flow of the grease onto the sliding surface along the grease supply path in response to rotation of the motor.
Claims19
An impact tool, comprising:
- a motor;
- a spindle rotatable by the motor;
- a hammer externally and coaxially mounted on the spindle, the hammer being configured to receive rotation of the spindle and movable relative to the spindle in an axial direction;
- an anvil located in front of the hammer and coaxial with the spindle, the anvil being configured to be struck by the hammer in a rotation direction;
- and
- a hammer case accommodating the spindle, the hammer, and the anvil, the hammer case allowing a front end of the anvil to protrude frontward from the hammer case, the hammer case being filled with grease,
- wherein the spindle includes
- a grease supply path located in the spindle, the grease supply path being open in a sliding surface of the spindle on which the hammer slides, the grease supply path allowing grease to be supplied to the sliding surface, and
- an accelerator disposed in the spindle, the accelerator being configured to accelerate a flow of the grease onto the sliding surface along the grease supply path in response to rotation of the motor, wherein
- the accelerator includes a rotation member rotatable on the grease supply path in response to rotation of the motor.
An impact tool, comprising:
- a motor;
- a spindle rotatable by the motor;
- a hammer externally and coaxially mounted on the spindle, the hammer being configured to receive rotation of the spindle and movable relative to the spindle in an axial direction;
- an anvil located in front of the hammer and coaxial with the spindle, the anvil being configured to be struck by the hammer in a rotation direction;
- and
- a hammer case accommodating the spindle, the hammer, and the anvil, the hammer case allowing a front end of the anvil to protrude frontward from the hammer case, the hammer case being filled with grease,
- wherein the spindle includes
- a grease supply path located in the spindle, the grease supply path being open in a sliding surface of the spindle on which the hammer slides, the grease supply path allowing grease to be supplied to the sliding surface, and
- an accelerator disposed in the spindle, the accelerator being configured to accelerate a flow of the grease onto the sliding surface along the grease supply path in response to rotation of the motor, wherein
- the accelerator includes a slope portion defined by an inner diameter of the grease supply path increasing gradually frontward.
An impact tool, comprising:
- a motor;
- a striker unit drivable by the motor, the striker unit including a grease supply path;
- an anvil configured to be struck by the striker unit in a rotation direction;
- and
- an accelerator configured to accelerate a flow of grease supplied to the striker unit, wherein
- the accelerator includes a rotation member rotatable on the grease supply path in response to rotation of the motor,
- the motor includes a rotational shaft protruding into the grease supply path, and
- the rotation member rotates integrally with the rotational shaft.
Dependencies are inferred from the claim text.