Controlled-folding and controlled-unfolding multiple section pla

Details Controlled-folding and controlled-unfolding multiple section pla Controlled-folding and controlled-unfolding multiple section pla

1979-01-16

1983-10-11

Paperner, Leslie J.

Material or article handling

Self-loading or unloading vehicles

Loading or unloading by other carrier or mover means, and...

187 9R, B60P 144

Patent

active

044089481

ABSTRACT:
A controlled-folding and controlled-unfolding multiple section platform assembly for a structural entry. A platform assembly includes an inner and an outer platform section which are pivotally joined together for folding and unfolding. Fold control means comprises a pair of pivotally jointed rigid supports and a rigid co-ordinating member extending between the inner platform section and the outermost of the rigid supports. Tilting of the inner platform section is accompanied by a folding action of the outer platform section, there being a unique included angle between the two platform sections for every unique angle of tilt of the inner platform section.

REFERENCES:
patent: 2405054 (1946-07-01), Pringle
patent: 2530341 (1950-11-01), Satsky
patent: 3275170 (1966-09-01), MacRae et al.
patent: 3791541 (1974-02-01), Himes
patent: 3795329 (1974-03-01), Martin et al.
patent: 3800915 (1974-04-01), Himes
patent: 3831788 (1974-08-01), Erlinder
patent: 3968890 (1976-07-01), Robson
patent: 4007844 (1977-02-01), Perkins

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