Torsion hold-down

Details Torsion hold-down Torsion hold-down

1977-07-29

1978-11-28

Byers, Nile C.

Bridges

Gangway, ramp, or dock leveler

Attached

B65G 6924

Patent

active

041269098

ABSTRACT:
A dock leveler having a ramp structure hingedly mounted on a support structure for swinging movement about a substantially horizontal hinge axis. A lifting mechanism coacts between the structures for normally urging the ramp structure to swing upwardly about the axis. A releasable holding means coacts between the structures for normally preventing upward swinging movement of the ramp structure. The holding means including a one-way latch device for permitting downward swinging movement of the ramp structure while restricting upward movement thereof. The holding means includes torsion spring means operatively coacting between the latch device and one of the structures for permitting upward swinging movement of the ramp structure through a limited angular extent even when the latch device is in a latched position in response to imposition of an external lifting force on the ramp structure.

REFERENCES:
patent: RE25249 (1962-10-01), Kelley
patent: 3117332 (1964-01-01), Kelley
patent: 3316575 (1967-05-01), Larsen
patent: 3334368 (1967-08-01), McIntosh
patent: 3537120 (1970-11-01), Alten
patent: 3646627 (1972-03-01), Potter
patent: 3699601 (1972-10-01), Hecker
patent: 3902213 (1975-09-01), Pfleger

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