Isolation mechanism for electrically isolating controls of...

Details Isolation mechanism for electrically isolating controls of... Isolation mechanism for electrically isolating controls of...

2011-07-19

2011-07-19

Shue, Alvin Chin (Department: 3634)

Fire escape, ladder, or scaffold

Means maintaining platform level on angularly movable support

Swingable support

Reexamination Certificate

active

07980359

ABSTRACT:
An isolation mechanism for electrically isolating a control input mechanism of an otherwise substantially conventional boomed apparatus (12), such as, for example, an aerial device, digger derrick, or crane, having a workstation (14) coupled with a movable boom (16), wherein the isolation mechanism allows a worker to control movement of the boom (16) and positioning of the work station (14) while protecting against electrical discharge along substantially any path which includes the control input mechanism. In a first embodiment, the isolation mechanism takes the form of an improved control input mechanism (10), portions of which are constructed of or covered with an electrically non-conducting material. In a second embodiment, the isolation mechanism takes the form of a boom extension (110) constructed of or covered with electrically non-conductive material. In a third embodiment, the improved control input mechanism (10) and the boom extension (110) are combined.

REFERENCES:
patent: 3136385 (1964-06-01), Eitel
patent: 3149694 (1964-09-01), Smithee
patent: 3380554 (1968-04-01), Duryee
patent: 3489243 (1970-01-01), Stilwell et al.
patent: 3842458 (1974-10-01), Bauer
patent: 3844378 (1974-10-01), Balogh
patent: 4437543 (1984-03-01), Fortin et al.
patent: 4724924 (1988-02-01), Breyer et al.
patent: 4762199 (1988-08-01), Holmes

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