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:
May. 08, 1990
Filed:
Oct. 14, 1988
Martin P Hageman, Mequon, WI (US);
Kelley Company Inc., Milwaukee, WI (US);
Abstract
An improved dockboard mechanism for a mechanical dockboard. The dockboard includes a frame that is mounted on a loading dock and a ramp is hinged at its rear end to the frame and is movable between a generally horizontal cross traffic position and an upwardly inclined position. The ramp is biased to the upwardly inclined position by a counterbalancing spring. The holddown mechanism includes a cylinder connected to the ramp and a piston is slidable within the cylinder and carries a piston rod which is connected to the frame. The piston is provided with a longitudinal passage which is closed off by a valve member, and an actuating rod is connected to the valve member and extends outwardly of the cylinder. Movement of the rod will open the valve member to permit extension of the piston rod with respect to the cylinder to enable the ramp to pivot upwardly by the counterbalancing spring.