| 摘要 |
A fissure cam device comprising a single axle arrangement of co-operating cams urgeable against an opening bias by a trigger movable along a support member attached to the axle into a closed position for insertion into a fissure, the cams having fissure wall-engaging edges maintained in operative contact with the fissure walls by the opening bias, such contact being reinforced by any tension at the support member, at least one cam of a co-operating pair of cams having a stud set into it and projecting into the path of the other cam about the axle to define a limit of relative rotation and prevent over-rotation.
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