| 摘要 |
<p>A torque transmitting and blocking device including a cylindrical drum (114), a pair of arcuate shoes (116 and 117) positioned within the drum, and a spanner bar (120) or ring extending between the shoes to one side of the axis of the drum. On the other side of the drum axis the shoes are displaceable toward each other, and may conveniently be lightly biased apart. The shoes have surfaces (130, 131, 134 and 135) (e.g.s holes, lateral or transverse projections, or the ends of the shoes) through which rotative forces can be transmitted from sources external of the drum and through which the shoes can retransmit such forces. Application of a rotational force through such a surface into a shoe in a direction tending to displace the shoes toward each other results in rotation of the shoes and bar within the drum. Application of a rotational force into a shoe in a direction tending to displace the shoes away from each other throws the shoes into a jamming relationship with the wall of the drum Applications of the device to winches, stepping clutches, and automatic load holders are disclosed.</p> |
