| 摘要 |
<p>A counterweight (30) is connected to a driving shaft (20) through a lost motion connection. The shaft is received in a bearing relationship in a fixed member. An axially extending portion (30-1) of the counterweight coacts with the fixed member to define a pair of chambers (30-4, 30-5) which radially vary such that the chambers taper convergingly in a circumferential direction corresponding to the normal direction of rotation of the shaft. Cylindrical pins (32, 33) are located in the chambers and provide a jamming relationship between the counterweight and the fixed member when said shaft tends to rotate in a reverse direction.</p> |
