To reliably apply on only movement in one direction of a moving body 500 as a rack part 300 of a rack part 3 moved along with movement of a moving body 500 is always engaged with a pinion part 101 of a braking part 1.
A first part 100 of the braking part 1 is provided with the pinion part 101 engaged with the rack part 300 of a rack part 3, and an outer peripheral part 111 of a second part 110 is formed in a gear shape. A containing space 201 of a clutch case 2 is formed such that an inside diameter y in a direction extending along the moving direction of the crack part 3 is slightly larger than the outside diameter of a second part 110 of the braking part 1. An engaging protrusion part 203 to block rotation of the whole of the braking part 1 within a containing space 201 as a result of a second part 110 of the braking part 1 being engaged with an outer peripheral part 11 through movement in the containing space 201 of the braking part 1 along with forward movement of the rack part 3 is formed in a part of an inner wall part 202 in which the containing space 201 is formed.
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ARAKAWA AKIRA
OKABAYASHI SHUNSUKE
Nobuhiko Nakamura