Railways: surface track – Portable track – Simulated roadbeds
Patent
1987-04-06
1988-02-23
Reeves, Robert B.
Railways: surface track
Portable track
Simulated roadbeds
14 695, E01B 2300
Patent
active
047265167
ABSTRACT:
A pair of coplanar, telescopic tracks are held in a spaced-apart and generally parallel relationship by a plurality of crossties. The crossties may also be telescopic to vary the space between the tracks according to use. At one end the tracks can be elevated by length-adjustable props or variable trusses. Each track comprises at least two segments, a first segment adapted to be slidably disposed in a channel of the second segment. The segments can be channel bars. A detent is used to temporarily hold the tracks at any of a plurality of telescoped lengths. A variable truss comprises a pair of divergent struts with a variable length member subtending the angle between the struts. This device is especially useful as a variable ramp for wheelchairs when it is made from relatively lightweight material such as aluminum.
REFERENCES:
patent: 484086 (1892-10-01), Cassidy
patent: 963918 (1910-07-01), Miller
patent: 1348142 (1920-07-01), Jaeger
patent: 1558581 (1925-10-01), Bloom
patent: 2076069 (1937-04-01), Davis
patent: 3074241 (1963-01-01), Cahill et al.
patent: 3936898 (1976-02-01), Poe
patent: 4013268 (1977-03-01), Williams
patent: 4107932 (1978-08-01), Cantrell
patent: 4528711 (1985-07-01), Packer
Reeves Robert B.
Werny Scott H.
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