Fire escape – ladder – or scaffold – Means maintaining platform level on angularly movable support – Swingable support
Patent
1993-08-26
1994-10-18
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Means maintaining platform level on angularly movable support
Swingable support
182 63, B66F 1104
Patent
active
053559703
ABSTRACT:
An articulated riser system for aerial access equipment wherein a parallelogram linkage is provided by a support frame, a riser frame assembly, and a pair of substantially parallel arms pivotally connected at each end to the support frame and riser frame assembly. The parallel arms are positioned one above the other and the lower arm is provided with a multicell cross-sectional configuration larger than the tubular cross-sectional configuration of the upper arm so that heavier loads can be supported by aerial access equipment than if both parallel arms had the same cross-sectional configuration. A trough is provided in the upper surface of the lower arm so that the upper arm is nested therein when the parallelogram linkage is in its fully lowered and fully raised positions.
REFERENCES:
patent: 3253677 (1966-05-01), Krynytzky et al.
patent: 4059170 (1977-11-01), Young
patent: 4616798 (1986-10-01), Smeenge et al.
patent: 4757875 (1988-07-01), Hade, Jr. et al.
patent: 5088676 (1992-02-01), Orchard et al.
patent: 5226776 (1993-07-01), Jestergaard
patent: 5249643 (1993-10-01), Backer et al.
Backer Robert D.
Hade, Jr. Donald C.
Chin-Shue Alvin C.
Kidde Industries, Inc.
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