| 摘要 |
<p>A mechanical coupling (10) for coupling a rotatable driving element (1a) to a rotatable driven element to be driven by the driving element (1a) , wherein the mechanical coupling (10) comprises a clutch mechanism (16) , mechanically between the driving element (1a) and the driven element; and wherein the clutch mechanism (16) is adjustable so that in normal use the driving element (1a) can drive the driven element substantially without slippage, but so that a given torque applied to said driven element, other than via the clutch (16) , in order to override the action of the driving element (1a) , causes the clutch mechanism (16) to slip, thereby overriding said driving element (1a) and allowing the driven element to be driven by the overriding torque, substantially without said overriding torque being applied to the driving element (1a) .</p> |
