Geometrical instruments – Straight-line light ray type – Alignment device
Patent
1995-09-26
1997-11-11
Will, Thomas B.
Geometrical instruments
Straight-line light ray type
Alignment device
33 1H, 33296, G01C 1506
Patent
active
056850824
ABSTRACT:
An adjustable grade stick and method of using the same are used to identify a reference line. The grade stick has a shaft that is adjustable along its length. In a preferred embodiment, the shaft has two sections where one section lies within the other in a variably telescoping manner. A locking device is provided to lock the relative positions of the first and second sections of the shaft. A hook is located at one end of the shaft to mount the shaft on the ceiling of the mine tunnel. A sighting ring is located at the other end of the shaft and has an inner aperture which acts as a marker for a reference point. A calibration scale is located on the shaft for positioning the sighting means at a predetermined location. The reference line is sighted from the sighting rings of a pair of grade sticks. A method of using the grade sticks consists of taking a pair of the adjustable grade sticks, adjusting their lengths to predetermined settings, mounting the grade sticks on the ceiling of a mine tunnel at predetermined locations and aligning the sighting rings on each shaft to form a reference line which is used to guide drilling operations within the mine.
REFERENCES:
patent: 685455 (1901-10-01), Kinkead
patent: 958736 (1910-05-01), Ferris
patent: 969732 (1910-09-01), Tebyrica
patent: 1134125 (1915-04-01), Hafner
patent: 2169533 (1939-08-01), Kasten
patent: 3484136 (1969-12-01), Colson
M&S Minovations Ltd.
Will Thomas B.
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