Fire escape – ladder – or scaffold – Ladder – Supporting surface compensating means
Patent
1990-11-09
1991-09-03
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder
Supporting surface compensating means
2481883, E06C 744
Patent
active
050444689
ABSTRACT:
A ladder leveling device having a pair of hydraulic cylinder/piston units to be secured at the outside lower ends of the ladder side rails in a manner so that the piston rods of the units extend as ladder supports. The working chambers of the units are in fluid communication with each other through a valved passageway which, when open, allow both piston rods to adapt to an irregular supporting surface while the ladder is oriented in a vertical plane. Upon closure of the passageway to isolate the working chambers of the respective units, the piston rods act as rigid extensions of the ladder side rails. Valving of the passageway is effected by a actuating member extending between the side rails in the region of a lower ladder rung so that the member may be depressed to close the passageway by one ascending the ladder in simply stepping on the actuating member.
REFERENCES:
patent: 1223367 (1917-04-01), Brown
patent: 1329740 (1920-02-01), Barron
patent: 2147052 (1939-02-01), Noone
patent: 2327317 (1943-08-01), Randall
patent: 2449609 (1948-09-01), Linder et al.
patent: 2552941 (1951-05-01), Courtney
patent: 2598875 (1952-06-01), Anderson
patent: 3768766 (1973-10-01), Bain
patent: 4625424 (1986-12-01), De La Haye
patent: 4807720 (1989-02-01), Kim
Machado Reinaldo P.
Worthington-Kemp
LandOfFree
Ladder leveling device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ladder leveling device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ladder leveling device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1001859