B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
294/13
B66C 1/66 (2006.01)
Patent
CA 1112684
Title IMPROVED HOISTING COUPLING FOR CONCRETE SLABS Abstract of the Disclosure A remotely releasable hoisting coupling for engagement with an anchor cast in place within a con- crete slab. The anchor provides a passage opening through the surface of the slab and an annular abutment shoulder spaced beneath said surface. The coupling comprises a body insertable into the anchor, a pair of lugs supported in the body at diametrically opposed positions for rocking movement about a diametric axis extending normal to the body, and means to selectively move the lugs between a protruding condition engaged with the abutment shoulder and a retracted condition disengaged from the shoulder. The means to selectively move the lugs comprises a rod axially moveable within the body and having cam surfaces directly engagable with the lugs to force the lugs to the protruding condition and holding surfaces to maintain the lugs in the protruding condition, without loading the cam surfaces. A lifting bail is carried by the body for pivotal movement about an axis extending parallel to the diametric axis of the lugs.
362269
Holt Jack A.
Lathrop Robert L.
Torbet Philip A.
Mmi Products Inc.
Osler Hoskin & Harcourt Llp
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