Abstract: First to fourth rotating bodies (12a-12d) are coaxially and sequentially disposed, the relative rotation amounts of adjacent rotating bodies are regulated by first to third relative rotation regulating means (13a-13c), the first to fourth rotating bodies (12a-12d) sequentially start to rotate with delays at the start of an operation, the first to fourth rotating bodies (12a-12d) integrally rotate finally, and rotation is transmitted from the first rotating body (12a) to the fourth rotating body (12d).

Abstract: Provided are a rotation assist tool 10 attached to a base side of a rotary shaft 12 having an output unit 11 on a front side thereof and a assist-attached rotation tool 31 including the rotation assist tool 10. The rotation assist tool 10 has a first rotating body 13; a second rotating body 14 that is held by the first rotating body 13 to be rotatable in forward and reverse directions; and at least one elastically deformable body 22 that is elastically deformed as the first rotating body 13 and the second rotating body 14 rotate relative to each other, and transmits rotation between the first rotating body 13 and the second rotating body 14, wherein the base side of the rotary shaft 12 is fixed to the first rotating body 13.

Abstract: A rotation transmission mechanism of the invention includes an inner rotating member and an outer rotating member that is rotatably disposed with respect to the inner rotating member. The inner rotating member includes an outer peripheral protruding portion that protrudes toward an outer peripheral side. The outer rotating member includes an annular portion and an inner peripheral protruding portion. The outer peripheral protruding portion has a forward movement surface at a position shifted from a center of the outer peripheral protruding portion in a forward rotational direction in which the rotation transmission mechanism is rotated by forward movement. An elastically deformable portion is disposed between the forward movement surface and the inner peripheral protruding portion.

Abstract: Disclosed is a rotation transmission mechanism including: an internal rotation member inserted by a crankshaft of a bicycle; and an external rotation member configured on the internal rotation member. The internal rotation member includes: an internal rotation member body. The external rotation member includes: a circular ring part configured at an outer side of the outer circumferential convex parts; and inner circumferential convex parts protruding to an inner circumferential side of the circular ring part and configured alternately with the outer circumferential convex parts. Elastic deformation parts are configured between the outer circumferential convex parts and the inner circumferential convex parts on a rotation direction side of the advancing outer circumferential convex parts. The outer circumferential convex parts are formed in such a manner that a surface on the rotation direction side is greater than a surface on an opposite side of the rotation direction.

Abstract: The present invention provides a rotation transmission mechanism including an internal rotation member and an external rotation member rotatably arranged with respect to the internal rotation member. The internal rotation member has one or a plurality of outer-peripheral-projected portions protruding toward an outer-peripheral side. The external rotation member has one or a plurality of inner-peripheral-projected portions. The outer-peripheral-projected portions have a forward-movement surface located at a position displaced from a center of the outer-peripheral-projected portion in a forward movement direction in which the rotation transmission mechanism rotates by forward movement. An elastically-deformable portion is disposed between the forward-movement surface and the inner-peripheral-projected portion. A space is partially formed in the elastically-deformable portion.

Abstract: Disclosed is a rotation transmission mechanism including: an internal rotation member inserted by a crankshaft of a bicycle; and an external rotation member configured on the internal rotation member. The internal rotation member includes: an internal rotation member body. The external rotation member includes: a circular ring part configured at an outer side of the outer circumferential convex parts; and inner circumferential convex parts protruding to an inner circumferential side of the circular ring part and configured alternately with the outer circumferential convex parts. Elastic deformation parts are configured between the outer circumferential convex parts and the inner circumferential convex parts on a rotation direction side of the advancing outer circumferential convex parts. The outer circumferential convex parts are formed in such a manner that a surface on the rotation direction side is greater than a surface on an opposite side of the rotation direction.