Abstract:
PROBLEM TO BE SOLVED: To provide a technique related to a reaction force receiver that is mounted in a handheld screw attachment/detachment tool and receives reaction force during screw attachment/detachment, the technique enabling an axial center distance between a mounting part of the screw attachment/detachment tool and a locking part for receiving reaction force to be changed by decentering a predetermined distance between the axial centers of a shaft-shaped member and a hole-shaped member and the axial center of the locking part.SOLUTION: A reaction force receiver 1 includes a reaction force receiving member 3 in which a receiving member side engagement part 32 for engaging a locking part 31 with a body side engagement part 22 is formed. One of the body side engagement part 22 and the receiving member side engagement part 32 is formed in a cylindrical shaft-shaped member 5, and the other is formed in a hole-shaped member 4 engaged with the shaft-shaped member 5. An axial center C1 of the shaft-shaped member 5 and the hole-shaped member 4 is decentered from an axial center C2 of the locking part 31 by a predetermined distance α, and the shaft-shaped member 5 and the hole-shaped member 4 are turnably formed. An axial center distance D between a mounting part 21 and the locking part 31 can be changed, so that the axial center distance D can be changed smoothly, and thereby the screw attachment/detachment operation is facilitated.
Abstract:
PROBLEM TO BE SOLVED: To provide a power type rachet wrench capable of using bearings and a craft shaft of conventional type and tightening or loosening bolts and nuts by human power without exerting such a force as to break a crank pin. SOLUTION: This rachet wrench includes over-rotation inhibitor 44, 45 for rachet yoke which inhibits a rachet yoke 6a from over-rotation by abutment against a part of the rachet 6a when the rachet yoke 6a rotates up to a position less than such an over-rotation angle that a crank pin 52 is broken by over-rotation of only one turn from a maximum deflection position by power driving at a torque exerted on an output shaft or from a maximum deflection position. COPYRIGHT: (C)2008,JPO&INPIT