Hoisting means including constant tension hoist wire

Details Hoisting means including constant tension hoist wire Hoisting means including constant tension hoist wire

1983-12-06

1986-09-09

Blix, Trygve M.

Traversing hoists

Having vertically swinging boom

Having means to swing boom vertically

212162, B66C 2382

Patent

active

046103651

ABSTRACT:
Hoisting arrangement having a boom or a crane with two separately driven hoist wires each with its individual cargo hook. The cargo hooks along with the hoist wires are used for various lifting operations. The hoist wires and a topping wire are operated by their respective winches. The hoist wires are connected via their winches to a common power supply system via a selection valve whereby a constant tension is exerted on the hoist wire. The winches are adapted to pay out hoist wire if the pull in the hoist wire exceeds this constant tension and to draw in hoist wire if the pull falls below the constant tension.

REFERENCES:
patent: 1139944 (1915-05-01), Wilson et al.
patent: 1357150 (1920-10-01), Curtis
patent: 1834985 (1931-12-01), Stoner
patent: 3388890 (1968-06-01), Born et al.
patent: 3578787 (1971-05-01), Brickett et al.
patent: 3726417 (1973-04-01), Nephew
patent: 4200052 (1980-04-01), Cunningham et al.

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