Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Torque responsive nut or bolt driving connection – Frangible connection
Patent
1988-04-12
1992-02-11
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Torque responsive nut or bolt driving connection
Frangible connection
411 42, 411 64, 4052591, F16B 3100, F16B 1306
Patent
active
050871609
ABSTRACT:
An expansion anchor assembly comprising a shell having three elongated vertical leaves of generally transverse arcuate configuration arranged to form a 360.degree. surface, the exterior of each leaf being provided with a gripping surface, each leaf being attached at its top to a bail, the bail comprising a solid top portion having a frangible central dome through which a rock bolt can be forced, the interior diameter of the dome being adapted to receive the top end of the rock bolt, the top end of the rock bolt being chamfered to ensure that it remains secure within the central dome during installation and to prevent lateral movement of the rock bolt relative to the anchor shell, and a wedge-member being threadably engagable with the rock bolt and being adapted so that on longitudinal movement of the wedge-shaped member away from the ball, the leaves are wedged apart and relative rotation between the leaves and the wedge member is prevented.
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American Mining Supply, Inc.
Wilson Neill R.
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