| 摘要 |
A hollow (3h) and a plurality of grooves (3j) are formed in a support portion (3g) of a side frame (3). A collar (8) is fit to the support portion in a state that it is axially movable but it is locked in its rotation. Gaps (a, b) are provided within the hollow (3h), while being positioned a distance apart in the axial direction of the collar (8). Elastic rings (29) and (30) each made of felt or soft rubber are placed within the gaps (a, b), respectively. A rotary member (15) and an inner ring (39) are fit to the handle drive shaft (7), and an adjusting member (40) is screw coupled to the handle drive shaft (7). An outer ring (9) of a one-way clutch (D) of a rolling type is inserted and fixed to a tubular portion (8a) of the collar (8). A holder (41) and bar-like rolling members (42) are disposed within the outer ring (9) of the one-way clutch (D). An inner surface (9a) of the outer ring (9) includes a free rotation area (alpha) which is shaped to be concave and allows the bar-like rolling member (42) to rotate thereon, and a stopping surface (beta) which stops the rotation of the bar-like rolling member (42) when it is brought into contact therewith.
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