Bridges – Gangway – ramp – or dock leveler – Attached
Patent
1980-10-31
1982-12-21
Byers, Jr., Nile C.
Bridges
Gangway, ramp, or dock leveler
Attached
16 82, E01D 100
Patent
active
043641377
ABSTRACT:
A device is provided for releasably locking one member in a predetermined extended position relative to a second member to which it is hingedly connected. The device includes a rod having one end portion pivotally connected to the one member and spaced from the hinge connection between the members. The rod has elongated first and second sections in endwise relation. The second section circumferential dimension is less than that of the first section forming a beveled shoulder between the two sections. A guide is adjustably mounted on the second member and spaced from the member hinge connection. The guide has an open-ended passageway through which the rod sections slidably extend upon relative movement of the one member. The passageway end closest to the pivotally connected rod end portion has a beveled surface which at least partially delimits the passageway end. When the one member is in the extended position, the beveled shoulder and beveled surface frictionally engage one another and restrain relative movement of the one member from said extended position to a predetermined second position. Means is provided for applying an external force to the rod effecting movement of the one member from the second position to the extended position. Biasing means is provided on the guide laterally shifting the rod relative to the guide passageway to effect engagement between the beveled shoulder and surface when the rod second section is aligned in the passageway. The biasing means also effects variation in the frictional engagement between the shoulder and beveled surface.
REFERENCES:
patent: Re17759 (1930-07-01), Hubbell
patent: 1491556 (1924-04-01), Shaw
patent: 3201814 (1965-08-01), LeClear
patent: 3249956 (1966-05-01), Zajac
patent: 3460175 (1969-08-01), Beckwith
patent: 3606627 (1971-09-01), Potter
patent: 3662416 (1972-05-01), Brooks
patent: 3951238 (1976-04-01), Dent
patent: 3986530 (1974-01-01), Le Clear
patent: 4047258 (1977-09-01), Burnham
patent: 4110860 (1978-09-01), Neff
Byers Jr. Nile C.
Rite-Hite Corporation
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