The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 28, 1978
Filed:
Jul. 29, 1977
Vernon O Smith, Ashley, OH (US);
Ronald E Abbott, Marion County, OH (US);
Overhead Door Corporation, Dallas, TX (US);
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.