Apparatus for erecting concrete wall panels

Details Apparatus for erecting concrete wall panels Apparatus for erecting concrete wall panels

1977-02-11

1983-11-29

Smith, James G.

Static structures (e.g., buildings)

With lifting or handling means for primary component or...

Construction or component having means to engage hand or...

294 86R, 294 89, E04D 1500

Patent

active

044174250

ABSTRACT:
A pickup device has a trunion plate that is placed across an opening formed by a tubular insert in a horizontal concrete slab or panel. A housing extends through a hole in the trunnion plate into the insert and defines an internal cavity disposed inwardly of the insert. A bore communicates an end of the housing outside the panel with the housing cavity. An axially movable actuator rod or plunger is disposed in the bore and includes a head disposed in the cavity and formed of contiguous cylindrical and conical portions. A plurality of lugs are movably mounted in housing cutouts that extend radially outward of the cavity and such lugs have sides facing the plunger head which are, respectively, parallel to the cylindrical and the conical portions of the plunger head for cooperation therewith so that the lugs are moved radially outward of the housing by the cooperating conical portion of the head and the angularly inclined lug sides. The lugs are locked in their extended position by the interengagement of the cylindrical head portion and corresponding straight lug sides. Pawls cooperate with the lugs and the plunger to retract the former in response to a pawl retracting motion of the plunger.

REFERENCES:
patent: 4068879 (1978-01-01), Torbet

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