Telescopic rock drill mounting

Details Telescopic rock drill mounting Telescopic rock drill mounting

1976-01-30

1978-01-03

Hafer, Robert A.

Tool driving or impacting

With means to adjust position of axis of tool advance

Adjustment powered by motor or mechanism

13762524, E21C 500

Patent

active

040661350

ABSTRACT:
A known triangular rock drill mounting comprising a drill feed leg pivoted to a vertical support with an adjustable counterbalancing arm is modified. The counterbalancing arm is a piston and cylinder fed with compressed air. The admission of compressed air is controlled by a valve with an actuating handle. The valve is so constructed that when a given triangular configuration is reached, constant pressure is restored in the cylinder by means of negative feed-back.

REFERENCES:
patent: 1446547 (1923-02-01), Crowe
patent: 1465568 (1923-08-01), Taylor
patent: 2103252 (1937-12-01), Gartin
patent: 2202216 (1940-05-01), Madsen
patent: 3036599 (1962-05-01), Doerfler
patent: 3171436 (1965-03-01), Lowell
patent: 3185222 (1965-05-01), O'Leary

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