| 摘要 |
A ratchet system includes a "T" shaped stop-engaging member mounted in a plane perpendicular to a rotating spindle and parallel to a circular carrier member having stop members mounted on the periphrey and rotating with the spindle. The stem of the "T" member is rotatable mounted in a housing surrounding the spindle and upon selective rotation, the ends of the "T" member cross-bar engage the stop members to prevent rotation in a selected direction. The "T" cross-bar transmits the engagement force directly to a recess in the inner wall of the housing. A hand-actuated knob assembly located outside the housing is connected to the "T" member stem by a resilient bushing which provides a restoring force to return the "T" member to a stop engagement position following defection by stop members traveling in a direction counter to that intended to be prohibited.
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