Apparatus for suspending a lifting pad

Details Apparatus for suspending a lifting pad Apparatus for suspending a lifting pad

1986-12-18

1988-05-31

Cherry, Johnny D.

Handling: hand and hoist-line implements

Utilizing fluid pressure

Venturi effect

248610, 267169, 267179, B66C 102

Patent

active

047476346

ABSTRACT:
A lifting pad is suspended from a traversing member mounted on and movable along a generally horizontal beam. The pad is suspended by a single generally vertical coil spring having predetermined tensile load versus extension characteristics. In order to prevent this spring from extending beyond a predetermined length corresponding to a predetermined design load, the apparatus includes a lanyard having a flexible lower portion with a loop at the lower end and a rigid upper portion threaded at its upper end. At loads above the design load a self-locking nut threaded on the upper end of the lanyard abuts a horizontal surface of the traversing member and the loop at the lanyard's lower end engages a horizontal pin mounted on the lifting pad, whereby the portion of the load in excess of the design load is borne by the lanyard and further extension of the spring is prevented.

REFERENCES:
patent: 1228690 (1917-06-01), Monnet
patent: 1285657 (1918-11-01), Finucan
patent: 4266905 (1981-05-01), Birk et al.

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