Rotary rock drill

Details Rotary rock drill Rotary rock drill

E - Fixed Constructions

21

C

E21C 1/00 (1995.01)

Patent

CA 2199579

The invention concerns a rotary rock drill which has a rotatable, axially immobilised leadscrew threaded through a feednut to which a drill head is connected. Drive and gearing means operate to rotate the leadscrew relative to the feednut so that the feednut advances linearly on the leadscrew. A linear drive transfer mechanism operates to transfer the linear advance of the feednut to a drill rod which is chucked to a spindle carried by the drillhead and which is parallel to and spaced apart from the leadscrew. A rotary drive transfer mechanism operates simultaneously to transfer rotation of the leadscrew to the drill rod during linear advance thereof.

L'invention est une perforatrice de roches rotative comportant une vis sans fin tournante immobilisée axialement et vissée dans un écrou d'avance auquel une tête de forage est fixée. Un dispositif d'entraînement et d'engrènement fait tourner la vis sans fin par rapport à l'écrou d'avance, de sorte que celui-ci avance linéairement sur la vis sans fin. Un mécanisme de transfert linéaire transfère l'avance linéaire de l'écrou d'avance d'une tige de forage montée en mandrin à un axe qui est porté par la tête de forage et qui est parallèle à la vis sans fin et espacé de cette dernière. Un mécanisme de transfert rotatif est simultanément en fonction pour transférer la rotation de la vis sans fin à la tige de forage durant l'avance linéaire de cette dernière.

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