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:
Apr. 28, 1992
Filed:
Mar. 01, 1991
Mark E Zachman, Troy, OH (US);
Michael H Kidwell, Huber Heights, OH (US);
Spectra-Physics Laserplane, Inc., Dayton, OH (US);
Abstract
A method and apparatus are disclosed for controlling the cross slope angle cut by the blade of an articulated frame motorgrader being steered through a turn, operated in a straight frame mode, in a crabbed steering position and/or traveling in a non-horizontal plane. The blade angle is sensed and controlled such that the sensed blade angle is maintained substantially equal to a calculated blade angle. In a first embodiment, the blade angle calculation is performed using the equation: tan BS=(sin .tau.')(tan R)+(cos .tau.')(tan CS) where BS is the required blade slope angle of said blade relative to horizontal; .tau.' is a rotational angle of the blade with respect to the blade's direction of travel projected into horizontal; R is an angle between the blade's direction of travel and horizontal; and CS is the desired cross slope angle which is entered by an operator of the motorgrader. In a further embodiment, the blade angle calculation is performed using the equation: tan BS=(sin .tau.')(tan R')+(cos .tau.')(tan CS) where BS is the required blade slope angle of the blade relative to horizontal; R' is the rotational angle of the blade with respect to the blade's direction of travel projected into horizontal with the lateral slope angle of the front steering unit set equal to zero; R' is an angle between horizontal and the direction of travel of the blade with the lateral slope angle of the front steering unit set equal to zero; and CS is the desired cross slope angle.