Bridges – Gangway – ramp – or dock leveler – Attached
Patent
1976-12-03
1977-09-13
Byers, Nile C.
Bridges
Gangway, ramp, or dock leveler
Attached
E01D 100, E01D 1506
Patent
active
040472582
ABSTRACT:
A loading dock board or ramp is provided having a counterbalanced, extendable lip incorporating a releasable lock mechanism. The dock board is provided with a projecting lip pivoted to the outer end of a platform and includes mechanisms for automatically raising or swinging the lip to an upwardly elevated or projected position. A counter-balance spring is included in the structure for assisting in the upward swinging movement of the lip and is structurally combined with a lip lock mechanism to maintain the lip in the projected position. This lip lock includes an automatically releasable mechanism which responds to a rearwardly directed force applied to the edge of the lip when thus elevated, to overcome to counter-balance spring and effect release of the lock thereby permitting the lip to swing by gravity to a dependent position.
REFERENCES:
patent: 3249956 (1966-05-01), Zajac
patent: 3323158 (1967-06-01), Loomis
patent: 3409922 (1968-11-01), Beckwith
patent: 3475778 (1969-11-01), Merrick
patent: 3606627 (1971-09-01), Potter
patent: 3699601 (1972-10-01), Hecker
patent: 3982295 (1976-09-01), Burnham
patent: 3997932 (1976-12-01), Artzberger
patent: 4010505 (1977-03-01), Bouman
Byers Nile C.
Harsco Corporation
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