Impact drill
AssigneeHitachi Koki Co., Ltd.
InventorsTakuma Saito, Shinki Ohtsu, Hideki Watanabe, Junichi Toukairin
Life of this patent
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Abstract
An impact drill includes a first ratchet rotating along with a spindle and movable in an axial direction, a second ratchet engaged with the first ratchet and movable in a axial direction but unrotatable, and a spring provided between the second ratchet and a partial member of a housing. An amount of movement of the spindle in the axial direction is regulated, so that the pressing force is too excessive, the restoring force of the spring urging the second ratchet is controlled to maintain a state of generating a set stroke force.
Claims15
An impact drill comprising:
- a spindle rotated by a motor and movable in an axial direction;
- a drill chuck fixed to the spindle and mountable with a drill bit;
- a first ratchet fixed to the spindle and having a face of an irregular portion;
- a second ratchet having a face of an irregular portion opposed to the face of the irregular portion of the first ratchet and movable in the axial direction but unrotatable;
- and
- a spring for urging the second ratchet in a direction of the first ratchet, in which the spindle is given an axial vibration by a contact and separation action between the irregular faces of the first ratchet and the second ratchet due to a relative rotation of the first ratchet to the second ratchet,
- wherein a regulating member regulates an amount of movement of the spindle at a plurality of positions in a range where the first ratchet and the second ratchet can be engaged.
An impact drill comprising:
- a spindle movable in an axial direction;
- a first ratchet fixed to the spindle and having an irregular surface;
- a second ratchet having an irregular surface opposed to the irregular surface of the first ratchet and movable in the axial direction but unrotatable;
- a spring for urging the second ratchet in a direction of the first ratchet;
- and
- a regulating member that controls an amount of impact force of the impact drill by regulating an amount of movement of the spindle.
Dependencies are inferred from the claim text.