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:
Dec. 18, 1990
Filed:
Jul. 18, 1989
Philip J Quenzi, Atlantic Mine, MI (US);
David W Somero, New Ipswich, NH (US);
Other;
Abstract
A guidance system and method for increasing the accuracy of laser guided machines such as screeds, graders, earth movers, floor saws and floor finishing machines. The system includes a laser beam receiver for sensing a laser reference beam provided off the machine. The laser receiver signals an electrical circuit when the laser beam is sensed in both centered and off-center regions. The electrical circuit operates a controller such as a solenoid operated fluid valve which controls a power source such as a fluid cylinder to move a machine element in one direction, such as raising a concrete screed, when the beam is sensed in the centered region, and in the other direction, such as lowering the screed, when the beam is sensed off-center. The method includes controlling the power source to continuously cycle the machine element between centered and off-centered regions to reduce the dead band, i.e., nonactive tolerance range, of the system.