| 摘要 |
A clutch is provided to grip a body having a smooth cylindrical surface such that if the body moves relative to the clutch it is urged to do so with a predetermined relationship between the axial movement and the rotational movement. By rotating the clutch relative to the cylindrical body, the body is urged to move in a direction of its cylindrical axis. Similarly, if the clutch is moved axially relative to the cylindrical body, the body is urged to rotate. The clutch contains rolling elements and performs much as the conventional anti-friction circulating ball lead screw found on automotive steering gear devices but no spiral groove is needed on the cylindrical body. In addition to the obvious advantages of dispensing with the spiral groove on the cylindrical body, the structure can readily be adapted to one-way clutching action. Alternately, the clutch is provided with means to selectively permit over-running in either, neither or both directions of axial and rotary motion of the cylindrical body. Clutching action can also be provided that is proportional to an external force applied to an optional element of the device.
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