Bridges – Gangway – ramp – or dock leveler – Attached
Patent
1976-01-02
1976-10-12
Byers, Jr., Nile C.
Bridges
Gangway, ramp, or dock leveler
Attached
188317, 188280, B65G 1100
Patent
active
039848892
ABSTRACT:
A weight-sensitive support assembly for an adjustable dock board of the type including a ramp with front and rear edges, with the rear edge being hingedly connected to an associated support structure so that the ramp may be swung up and down between a relatively lowered position and a relatively elevated position, the assembly comprising an elongated hollow cylinder member containing a quantity of operating fluid, a piston reciprocally disposed within the cylinder member, a piston rod member connected to the piston, connecting means operatively connecting one of the members to the ramp and the other of the members to the associated support structure, and valve means for controlling movement of the piston within the cylinder member, the valve means being responsive to a first preselected load applied to the ramp to resist movement of the piston within the cylinder member and being further responsive to a second preselected load applied to the ramp to permit movement of the piston and piston rod relative to the cylinder member, whereby the ramp will be maintained in a predetermined position when the first preselected load is applied thereto, and may be moved toward the other of said positions when the second preselected load is applied thereto.
REFERENCES:
patent: 2697496 (1954-12-01), McIntyre
patent: 2841813 (1958-07-01), Falk
patent: 2881457 (1959-04-01), Rodgers
patent: 2897923 (1959-08-01), Agar
patent: 3038560 (1962-06-01), Long
patent: 3167796 (1965-02-01), Layne
patent: 3256961 (1966-06-01), De Carbon
patent: 3271801 (1966-09-01), Dieter
patent: 3290709 (1966-12-01), Whitenack
patent: 3694839 (1972-10-01), Loblick
patent: 3835497 (1974-09-01), Smith
Byers Jr. Nile C.
Monroe Auto Equipment Company
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