Abstract: A steering shaft is rotatably supported on a body by a housing, and a slide portion having a handlebar attachment portion at the top is attached to the steering shaft. The rotational movement of a handlebar around the central axis of the steering shaft is regulated by a rotation regulating mechanism, while the axial translation of the handlebar is allowed. The steering shaft is provided with a plurality of grooves. A lock mechanism provided in the slide portion inserts a locking bar into any one of the grooves to regulate the axial translation of the slide portion. Owing to the shape of a link portion and a cam groove constituting the lock mechanism, the locking bar is not pulled, out of the groove by operations other than a release operation using a release lever.

Abstract: A steering shaft is rotatably supported on a body by a housing, and a slide portion having a handlebar attachment portion at the top is attached to the steering shaft. The rotational movement of a handlebar around the central axis of the steering shaft is regulated by a rotation regulating mechanism, while the axial translation of the handlebar is allowed. The steering shaft is provided with a plurality of grooves. A lock mechanism provided in the slide portion inserts a locking bar into any one of the grooves to regulate the axial translation of the slide portion. Owing to the shape of a link portion and a cam groove constituting the lock mechanism, the locking bar is not pulled, out of the groove by operations other than a release operation using a release lever.