Impact drill
AssigneeHitachi Koki Co., Ltd.
InventorsTakuma Saito, Shinki Ohtsu, Jyunichi Toukairin, Kenji Kataoka, Kazuhide Ohzeki, Shigeru Ishikawa, Hideki Watanabe
Life of this patent
Estimating the term…
Abstract
An impact drill minimizing transmission of vibration to a handle gripped by a user's hand. A spindle extends through a main frame and is movable in its axial direction and rotatable about its axis. A first ratchet is rotatable and axially movable together with the spindle. A second ratchet is axially movable but unrotatable. In an impact drilling mode, the first ratchet is brought into abutment with the second ratchet so that the spindle is reciprocally moved in the axial direction.
Claims16
An impact drill for boring a workpiece comprising:
- a main frame;
- a motor housed in the main frame;
- a spindle supported by the main frame and rotatable by the motor and movable in its axial direction;
- a first ratchet rotatable together with the rotation of the spindle and movable in the axial direction together with the spindle;
- a second ratchet positioned in confrontation with the first ratchet and movable in the axial direction but unrotatable about its axis, wherein repeated abutment between the first ratchet and the second ratchet when the spindle is moved to a first axial position causes axially reciprocating movement in the spindle;
- a first spring biasing the second ratchet in a first axial direction;
- and
- a second spring biasing the second ratchet in a second axial direction opposite to the first axial direction.
An impact drill for boring a workpiece comprising:
- a main frame having an inner peripheral surface;
- a motor housed in the main frame;
- a spindle supported by the main frame and rotatable by the motor and movable in its axial direction;
- a first ratchet rotatable together with the rotation of the spindle and movable in the axial direction together with the spindle;
- a second ratchet positioned in confrontation with the first ratchet and movable in the axial direction but unrotatable about its axis, the second ratchet having an outer peripheral surface, wherein repeated abutment between the first ratchet and the second ratchet when the spindle is moved to a first axial position causes axially reciprocating movement of the spindle;
- and
- a damper member disposed between the main frame and the outer peripheral surface of the second ratchet.
Dependencies are inferred from the claim text.