Fire escape – ladder – or scaffold – Convertible
Patent
1982-11-12
1985-01-22
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Convertible
182106, 182 16, 280 30, E06C 1397, B62B 120
Patent
active
044946260
ABSTRACT:
This invention is a combination stepladder and hand truck apparatus having a ladder support frame assembly pivotally connected to an upper portion of a hand truck support frame assembly and further including a support and lock plate assembly and a wheel support assembly which are both connected to a lower portion of the hand truck support frame assembly. The ladder support frame assembly includes a basic support frame with a support handle member at one end portion thereof and interconnected by axially spaced support step assembly. The support step assembly includes a lock or latch step member which is operable to support a user thereon and conjointly locks with the hand truck support frame assembly in a rigid condition when in the stepladder usage condition. The support and lock plate assembly includes a support plate member which is pivotally mounted on a support shaft member which, in turn, is secured across a lower portion of the hand truck support frame assembly. The support plate member is pivotally movable to a nonusage condition when utilizing the invention in a stepladder usage condition. The support plate member is pivotal into a latched or locked condition to hold the ladder support frame assembly against the hand truck support frame assembly when placed in the hand truck usage condition. The wheel support assembly is placed in an elevated position not contacting the adjacent support surface when the invention is moved to the stepladder usage condition. The wheel support assembly is adapted to contact the support surface when the adjacent ladder support frame assembly and hand truck support frame assembly are moved rearwardly to a desired position of 221/2 degrees from a vertical plane to the support surface to operate as a conventional hand truck structure.
REFERENCES:
patent: 300496 (1884-06-01), Nelson
patent: 345973 (1886-07-01), Hill
patent: 548111 (1895-10-01), Cardarelli
patent: 867754 (1907-10-01), Randall
patent: 1992108 (1935-02-01), White
patent: 2980200 (1961-04-01), Kibby
patent: 3104889 (1963-09-01), Branch
patent: 3897080 (1975-07-01), Isom
patent: 3954155 (1976-05-01), Guidara
patent: 4258826 (1981-03-01), Murray
Harper Truck, Inc.
Machado Reinaldo P.
Rein Phillip A.
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