Supports – Pipe or cable – Extending through plate
Patent
1986-07-07
1987-12-15
Foss, J. Franklin
Supports
Pipe or cable
Extending through plate
248200, F16M 1300
Patent
active
047127546
ABSTRACT:
The invention is an anchoring device for releasably anchoring within a crack in a rock face, the crack having a pair of opposed crack walls. The device has a cam member, a load cable, and expansion and retraction structure. The cam member has convexly curved cam surfaces which contact respective walls of the crack. An inner end portion of the load cable cooperates with the cam member, and an outer end portion of the cable has a loop to cooperate with a separate link or rope. An intermediate portion of the cable cooperates with shoulders of the cam member in such a manner as to rotate the cam member in first direction when the cable is pulled. This increases force acting on the crack walls and augments retention of the device within the crack. The expansion structure automatically rotates the cam member in the first direction, thus tending to initiate retention of the device within the crack. The retraction structure rotates the cam member in a second direction, opposite to the first direction, so as to decrease force on the crack walls, thus facilitating removal of the device from the crack. The invention provides a simple mechanical device which is easy to insert and remove from the crack and is particularly adapted for fitting within cracks having essentially parallel crack walls. The device is relatively insensitive to off-axis forces, which are prone to damage some prior art structures having rigid load carrying members.
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High Magazine, Sep. 1985, pp. 56 and 57.
Summit Magazine, Mar./Apr. 1985, p. 30.
Foss J. Franklin
Talbott David L.
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