Material or article handling – Self-loading or unloading vehicles – Conveyor
Patent
1991-07-31
1992-11-03
Werner, Frank E.
Material or article handling
Self-loading or unloading vehicles
Conveyor
414522, 414921, 14 711, B60P 100
Patent
active
051602369
ABSTRACT:
An elongated ramp is provided for longitudinal extension and retraction relative to a predetermined margin of a support structure therefor. The ramp includes a longitudinally short base end section and a considerably longer outer end section and the support and ramp include coacting guide structures for supporting and guiding the ramp during extension and retraction thereof, the outer end section of the ramp being automatically disengaged from the support and guide structure responsive to the ramp approaching its fully extended position. In a first form of ramp, a biasing structure is operatively connected between the sections yieldingly resisting downward swinging of the outer end section as it disengages from the support and guide structure during extension of the ramp and the biasing structure is operative to counteract a major portion, only, of the force of gravity acting upon the outer end section to swing the outer end thereof downwardly as the ramp moves to its fully extended position. A second form of ramp structure is provided for gently lowering the outer end of the ramp to the ground after full ramp extension and also for raising the outer portion of the ramp to an essentially horizontal position prior to ramp retraction.
REFERENCES:
patent: 147600 (1874-02-01), Campbell
patent: 502568 (1893-08-01), Kuckartz
patent: 1717303 (1929-06-01), Barclay
patent: 1777966 (1930-10-01), Fageol
patent: 1884513 (1932-10-01), Barclay
patent: 2233181 (1941-02-01), Quartullo
patent: 2370427 (1945-02-01), Sherry
patent: 2480047 (1949-08-01), Reinhard
patent: 2659504 (1953-11-01), Kranawetvogel
patent: 2788751 (1957-04-01), Russell
patent: 2892556 (1959-06-01), Lowe
patent: 3193321 (1965-07-01), Rose
patent: 3302229 (1967-02-01), Teague, Jr.
patent: 3651965 (1972-03-01), Simonelli et al.
patent: 3711882 (1973-01-01), Iller
patent: 3874527 (1975-04-01), Royce
patent: 3941261 (1976-03-01), Ricci
patent: 4026387 (1977-05-01), Abreu
patent: 4078678 (1978-03-01), Tordella
patent: 4131209 (1978-12-01), Manning
patent: 4143281 (1979-03-01), Appley
patent: 4235399 (1980-11-01), Shorey
patent: 4294571 (1981-10-01), Tordella
patent: 4479753 (1984-10-01), Thorley
patent: 4671730 (1987-06-01), Gateau
patent: 4759682 (1988-07-01), Hood
patent: 4778328 (1988-10-01), Apgar
patent: 4827548 (1989-05-01), Hood
patent: 5064335 (1991-11-01), Bergeron et al.
Redding Charles E.
Redding Edward M.
Kennan James
Werner Frank E.
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