Reversible percussion piston drill apparatus

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 1/00 (2006.01) E21B 4/14 (2006.01)

Patent

CA 2204230

In a percussion drill apparatus for soil drilling with a percussion piston which is moving to and fro within a housing, a control sleeve is mounted on a control tube which protrudes into the percussion piston chamber, the axial position of which determines the direction of movement of the apparatus. In order to make a reversal of movement possible a reversing chamber is connected with a control air line which runs inside the control tube end an approach chamber is connected by way of a drilling with the interior of a control tube which feeds the operating air into the percussion piston chamber. Consequently the control sleeve is moved into one direction with the aid of the control air and in the other direction with the aid of the operating air.

Appareil de forage du sol par percussion comportant un piston à percussion se déplaçant de haut en bas dans un boîtier, un manchon de commande installé sur un tube de commande qui fait saillie dans la chambre du piston à percussion et dont la position axiale détermine la direction du déplacement de l'appareil. Afin de rendre l'inversion du mouvement possible, une chambre d'inversion est reliée à une conduite d'air de commande qui se situe à l'intérieur de l'extrémité du tube de commande et une enceinte d'accès est reliée, au moyen d'un trou percé, à l'intérieur du tube de commande qui sert à alimenter en air la chambre du piston de percussion. C'est ainsi que le manchon de commande se déplace dans une direction sous l'impulsion de l'air de commande et dans l'autre direction sous l'impulsion de l'air de fonctionnement.

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