
This is often the drilling has to be done manually, using the so-called “ratchet”. Innovator of the mine office Voroshilovgradsky N. Seagull has found a way to mechanize this operation, the developing device on the basis of the drill. The device consists of a worm gear whose worm wheel shaft has a form that allows to insert it into the Chuck of a drill. The torque is transmitted to the second worm mounted on a shaft with a cone, designed for mounting in the drill of the required diameter. The required force for axial feed of a drill in the cone is achieved by mechanical means: unscrewing screw M24 abutting any nearest ledge. This attachment to the drill increases production, reduces labor intensity of the operation and accelerate the repair works.

Attachment to the drill:
1 — reducer, 2 — worm wheel, 3 shaft, is inserted in the drill, a 4 second worm, 5 — Wai with cone, 6 — stop screw.