Overhead impact sensing system

Details Overhead impact sensing system Overhead impact sensing system

1990-02-12

1990-12-25

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

With indicator, signal or alarm

182 19, 182 2, 212149, 212151, B66F 1104

Patent

active

049795880

ABSTRACT:
An electrical deactivation circuit and a two piece overhead guard assembly including two separately movable bar members which extends upward and over the head of an operator located on the upper work platform of an aerial work platform. The guard bar members are connected to the frame of the upper work platform by a pair of movable support assemblies, the movement of which actuates impact detection induction type proximity switch means to interrupt electrical power applied to the electrical control circuits and stop the engine powering the aerial work platform. Each movable support assembly includes a pair of spring loaded mechanical subassemblies including a pair of clamp members between which is located an elongated coil spring whose stiffness is varied in accordance with the distance separation of the clamps. An inductive type proximity switch is located in the lower end portion of each spring to sense movement of the inner end of a respective guard bar member. Each proximity switch is connected in an electrial circuit having a built in time delay or lock out feature for applying power to the aerial work platform after a predetermined time delay and thereafter interrupting power when either guard bar member strikes or comes into contact with an external object or obstruction.

REFERENCES:
patent: 2815250 (1957-12-01), Trump
patent: 2979152 (1961-04-01), Eitel
patent: 3638758 (1972-02-01), Weisker
patent: 3670849 (1972-06-01), Milner
patent: 4064997 (1977-12-01), Holland
patent: 4456093 (1984-06-01), Finley
patent: 4690246 (1987-09-01), Hornagold

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