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:
Feb. 19, 1985
Filed:
Sep. 30, 1982
Applicant:
Inventor:
David S Leong, Lincolnwood, IL (US);
Assignee:
Templeton Kenly & Company, Broadview, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66F / ;
U.S. Cl.
CPC ...
254 95 ; 7441 / ;
Abstract
A mechanical jack construction is provided comprising a load-bearing rack which is adapted to be moved in the vertical plane by an engaging pinion. The pinion is connected to a lever-driven ratchet wheel by means of shear pins. Application of an excessive load to the load-bearing rack will result in fracture of the shear pins, disengagement of the pinion from the ratchet wheel and substantially instantaneous lowering of the rack. Such construction lends itself to use in track repair and similar applications in which immediate jack retraction is desired upon engagement of excessive loads.