Mining or in situ disintegration of hard material – Automatic control; signaling or indicating – Of hard material disintegrating machine
Patent
1981-12-08
1984-08-07
Purser, Ernest R.
Mining or in situ disintegration of hard material
Automatic control; signaling or indicating
Of hard material disintegrating machine
248333, 362147, 362191, 362269, E21D 900
Patent
active
044639864
ABSTRACT:
The present invention relates generally to illumination devices and method of use in tunnel alignment. More particularly, the present invention relates to an illumination device producing a concentrated directional light beam adapted for verifying the center plane of a boring in an underground mine passageway. The illumination device includes a first elongated portion having a longitudinal axis. An arangement for fastening the first portion to a support is provided at a first end of the first portion. A second portion rotatably received by the first portion includes a light source for producing a directional light beam. The light beam is adapted to be directed away from the longitudinal axis of the first portion. An arrangement for retaining the second portion in a predetermined angular position with respect to the axis of the first portion is also provided. In a preferred embodiment, the second portion is telescopically received within the first portion and includes a hinge arrangement which permits pivotal movement of a holder for the light source relative to a segment of the second portion to a location substantially perpendicular to the longitudinal axis of the first portion.
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Costa Dominick
Sodder, Jr. George
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