Tool driving or impacting – Drive by means reacting to rotating eccentric mass
Patent
1986-09-03
1987-12-15
Bell, Paul A.
Tool driving or impacting
Drive by means reacting to rotating eccentric mass
173 20, 173 39, 33125W, E21B 1504
Patent
active
047126248
ABSTRACT:
A rock drill having a tunnel profile control system comprising a boom assembly, a converting unit for converting the position of one of positioning points on an orthogonal coordinate system representative of the transverse section of a tunnel to be driven, into a respective value on a boom coordinate system, a positioning control for positioning the boom means according to a value from the converter unit, an ultrasonic distance measuring instrument mounted on the boom assembly for determining the distance between the position point and a point on the peripheral wall defining the tunnel, and an arithmetic unit which utilizes the distance measured between the positioning point and the point on the peripheral wall defining the tunnel, the direction of travel of ultrasonic waves, and the value of the positioning point to calculate, in terms of a value in the orthogonal coordinate system, a value of a measuring point on the transverse section of the tunnel.
REFERENCES:
patent: 3003239 (1961-10-01), Weidren et al.
patent: 4343367 (1982-08-01), Mashimo
patent: 4499953 (1985-02-01), Molin
patent: 4586571 (1986-05-01), Rajakallio et al.
Bell Paul A.
Fridie, Jr. William
Mazda Motor Corporation
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