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US 4,945,221 AGranted
Apparatus and method for controlling a hydraulic excavator
AssigneeLaser Alignment, Inc.
InventorsEdward G. Nielsen, Timothy E. Steenwyk
Life of this patent
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AssigneeLaser Alignment, Inc.
InventorsEdward G. Nielsen, Timothy E. Steenwyk
Estimating the term…
A control for an excavator controls the position of the bucket cutting edge to a desired depth accurately by a calibrating laser receiver mounted on the excavator stick member and passed through a stationary laser plane wherever the stick is moved into or out of a trench. Linear position encoders monitor the length that the actuating cylinders are extended and lookup tables convert the encoder outputs to angle representations for determining the positions of the laser receiver and the cutting edge. Other lookup tables are utilized to avoid time-consuming iterative calculation procedures to provide real-time digital process solutions of trigonometric functions. The apparatus includes a unique laser receiver comprising a plurlaity of linearly aligned photo receptors with associated circuitry for producing an output representative of the receptor illuminated or, if a group of receptors are illuminated, the centermost receptor illuminated.
A laser receiver comprising:
A laser receiver comprising:
A laser receiver comprising:
Dependencies are inferred from the claim text.