Handling: hand and hoist-line implements – Grapple – Lewises
Patent
1976-07-12
1978-01-17
Marbert, James B.
Handling: hand and hoist-line implements
Grapple
Lewises
52707, 52125, 294 86R, B66C 166
Patent
active
040688798
ABSTRACT:
A socket cavity formed in a concrete slab of the type poured horizontally and subsequently tilted up, which cavity affords engagement of hoisting equipment to the slab. The inner portion of the cavity is in the form of a frusto-conical wall surface communicating with the surface of the cavity through a cylindrical bore concentric with the frusto-conical surface. The cavity is formed by placing in the slab form an expendable flask-like hollow article formed of synthetic resin or the like which is left in the slab after erection thereof. Engaging apparatus cooperable with the cavity which has on the inner end thereof arms that are pivotally moveable between a retracted position and an extended position, the arms engaging the frusto-conical wall of the cavity when in the extended position. The apparatus includes mechanism at the outer end thereof for effecting retraction or extension of the arms, the mechanism being remotely operable so as to afford disengagement of the hoisting mechanism from the slab from a remote location after erection of the slab.
REFERENCES:
patent: 3431012 (1969-03-01), Courtois et al.
patent: 3596971 (1971-08-01), Courtois et al.
patent: 3698756 (1972-10-01), Groves
patent: 3993341 (1976-11-01), Bentley
Eager Cyril Thomas
Torbet Philip A.
Marbert James B.
The Burke Company
LandOfFree
Concrete slab hoisting apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Concrete slab hoisting apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Concrete slab hoisting apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2279269