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:
Jul. 12, 1977
Filed:
Nov. 03, 1975
Applicant:
Inventor:
Ted L Teach, Dayton, OH (US);
Assignee:
Laserplane Corporation, Dayton, OH (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E02F / ; E02F / ; E02F / ; G05G / ;
U.S. Cl.
CPC ...
37 86 ; 33264 ; 33DI / ; 37DI / ; 37DI / ; 37DI / ; 7343 / ; 356172 ;
Abstract
The cutting depth of an endless chain type trencher is normally determined by the angle of the frame carrying the endless chain relative to the horizontal. In accordance with this invention, the angular position of the digging frame is controlled by one or more hydraulic cylinders which, in turn, are controlled by signals derived from sensors carried by an upstanding vertical mast mounted to the frame which detects a reference plane defined by a rotating laser beam. A trigonometric correction factor to compensate for the mast mounting is included.