Bridges – Gangway – ramp – or dock leveler – Attached
Patent
1981-12-21
1983-08-16
Byers, Jr., Nile C.
Bridges
Gangway, ramp, or dock leveler
Attached
E01D 100
Patent
active
043983154
ABSTRACT:
A yieldable and releasable lip lifting mechanism for a dockboard. The dockboard includes a ramp which is pivoted at its rear edge to a supporting structure, and a lip is hinged to the forward edge of the ramp and is movable between a downwardly hanging pendant position and an extended position. As the ramp is walked down from an inclined position toward a horizontal position, a lip lifting mechanism becomes operative to raise the lip and hold the lip in the extended position. A yieldable connection is incorporated in the lip lifting mechanism which enables the lip lifting mechanism to yield and fall out of supporting engagement when a substantial force is applied to the extended lip. In addition, the yieldable connection can be manually released by an operator to permit the lip to fall to its pendant position.
REFERENCES:
patent: 3409922 (1968-11-01), Beckwith
patent: 3475778 (1969-11-01), Merrick
patent: 3528118 (1970-09-01), Smith
patent: 3579696 (1971-05-01), Hecker
patent: 3646627 (1972-03-01), Potter
patent: 3967337 (1976-07-01), Artzberger
patent: 3997932 (1976-12-01), Artzberger
patent: 4047258 (1977-09-01), Burnham
Driear Joseph R.
Kovach Jonathan W.
Byers Jr. Nile C.
Kelley Company Inc.
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