Piolax, Inc.

Kanto Auto Works, Ltd.

Noboru Niikura

Tsutomu Kato

Kouichi Katou

Toshihiko Ookawara

A rotary type extension/retraction device includes a body member, a movement member, a spring member, a protrusion and a cam groove. The cam groove has a first fitting groove configured to hold the movement member in a state protruding from a cylindrical part of the body member, a second fitting groove configured to hold the movement member in a state pulled in the cylindrical part, a first guide groove configured to guide the protrusion from the first fitting groove to the second fitting groove, and a second guide groove configured to guide the protrusion from the second fitting groove to the first fitting groove. The first fitting groove, the first guide groove, the second fitting groove and the second guide groove are arranged circumferentially along an inner periphery of the cylindrical part in this order.

Rotary type extension/retraction device

A lock apparatus includes a operation handle, a pair of springs movably supported by the container member, a pair of slide pins urged in directions of lock holes defined on the support member by the springs, respectively, and a pair of cam members to which rear end portions of the slide pins are fitted, respectively, to urge each slide pin to project and retract. When the operation handle is operated in a swing manner, a front end portion of each slide pin is retracted from each lock hole of the support member against pressure of each spring. Engagement holes are defined on opposed surfaces of each front end portion of the cam member having a cylindrical shape. Each rear end portion of the slide pin is formed in a bifurcated structure to have elastic pieces. Each of elastic pieces has a protrusion for detachably engaging with each of engagement holes.

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Kanagawa, Japan

Noboru Niikura