Traversing hoists – Overhead – Cable
Patent
1976-03-29
1977-12-27
Oresky, Lawrence J.
Traversing hoists
Overhead
Cable
212 39P, 340267C, B66C 1348
Patent
active
040649970
ABSTRACT:
A system to prevent a crane turret and the boom carried thereby from rotating about the axis of the turret beyond a predetermined angular disposition, thereby to prevent the crane boom from being brought too close to high-tension wires or some other structure in the vicinity of which the crane is being operated. Means are provided for locked-in disposition at at least one, and preferably, two points about the 360.degree. arc circumscribing the turret with such means including projections adapted to trip limit switches extending radially outwardly from the rotatable turret. Each limit switch is connected into an electromagnetic circuit with the first switch to be tripped serving to actuate an audio and/or visual warning system, and the second switch to be tripped, an electromagnetic control of the fluid flow in a hydraulic or compressed air driving system. Such electromagnetic control overrides any manual control in the operator's cab of the hydraulic or air cylinder which releases or locks the brake band about the fixed post coaxial with the turret drum and about which the turret drum rotates. When such override occurs, the brake band is tightened to prevent further relative angular movement between the turret and the fixed post. Additionally, inductive means may be provided on the boom to detect undesirable proximity of the boom to high-tension lines and with such detection also to operate first, said warning device and then, the hydraulic or air cylinder override, thereby to prevent further angular rotation of the turret relative to said post.
REFERENCES:
patent: 3253683 (1966-05-01), Stein
patent: 3285430 (1966-11-01), Whitmire
patent: 3650568 (1972-03-01), Poplawski
patent: 3756665 (1973-09-01), Ryan
patent: 3833898 (1974-09-01), Wilkinson
Holland Eugene Richard
Schlieman Melvin Glynn
Oresky Lawrence J.
Pavitt, Jr. William H.
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