Abstract: A retaining-ring-attaching tool includes a holding portion having a notch in which a retaining ring is held; a body supporting the holding portion such that the holding portion is movable in one direction; a link mechanism including an operation portion supported by the body and being operable with a finger of a hand holding the body, the link mechanism being configured to move, when the operation portion is operated, the holding portion between a first position and a second position where the retaining ring held in the notch is ready to be attached to a shaft member, the link mechanism further including a force-applying portion applying an external force to the holding portion such that the holding portion moves to the second position; and a feeding portion supported by the body and, when the holding portion is moved to the first position, feeding the retaining ring to the notch.

Abstract: A retaining-ring-attaching tool includes a holding portion having a notch in which a retaining ring is held; a body supporting the holding portion such that the holding portion is movable in one direction; a link mechanism including an operation portion supported by the body and being operable with a finger of a hand holding the body, the link mechanism being configured to move, when the operation portion is operated, the holding portion between a first position and a second position where the retaining ring held in the notch is ready to be attached to a shaft member, the link mechanism further including a force-applying portion applying an external force to the holding portion such that the holding portion moves to the second position; and a feeding portion supported by the body and, when the holding portion is moved to the first position, feeding the retaining ring to the notch.

Abstract: A screw fastening device includes: a supply target member which extends in one direction and to which male screws are to be supplied; a first magnet that positions the male screw supplied to the supply target member by a magnetic force so that the male screw extends in the one direction and makes a head portion of the male screw face one side; a holding member that is movable relative to the supply target member in the one direction, includes a second magnet as defined herein, and holds the male screw as defined herein; and an applying member that applies torque to the male screw held by the holding member.