Bridges – Gangway – ramp – or dock leveler – Attached
Patent
1975-03-25
1976-07-06
Byers, Nile C.
Bridges
Gangway, ramp, or dock leveler
Attached
B65G 1100
Patent
active
039673375
ABSTRACT:
A return-to-dock-level mechanism for a dockboard. The dockboard includes a ramp which is hinged at its rear edge to a loading dock and a lip is hinged to the front edge of the ramp and can be pivoted from a downwardly hanging pendant position to an extended position flush with the ramp surface. The ramp is adapted to be moved from the horizontal cross traffic position to an upwardly inclined position by a counterbalancing spring assembly, and a uni-directional holddown mechanism will prevent upward movement of the ramp unless manually released through operation of a cable. An operating link is supported by the ramp and has one end attached to the holddown cable. When the ramp is walked down to a below dock level position with the lip extended, the link is moved to a latched position. After loading is completed and the truck pulls away from the dock, the lip will fall to its pendant position and the downward movement of the lip is transmitted to the link to pivot the link and release the holddown mechanism to cause the ramp to be elevated through the counterbalancing spring assembly. As the ramp is elevated to dock level, the link is unlatched to release the pull on the holddown cable and prevent further upward movement of the ramp.
REFERENCES:
patent: 3117332 (1964-01-01), Kelly
patent: 3323158 (1967-06-01), Loomis
patent: 3411168 (1968-11-01), Hecker
patent: 3454974 (1969-07-01), Kumpolt
patent: 3475778 (1969-11-01), Merrick
patent: 3500486 (1970-03-01), Le Clear
patent: 3662416 (1972-05-01), Brooks
patent: 3671990 (1972-06-01), Hovestad
patent: 3699601 (1972-10-01), Hecker
patent: 3728753 (1973-04-01), Beckwith
patent: 3786530 (1974-01-01), Le Clear
Byers Nile C.
Kelley Company Inc.
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