APPARATUS FOR DRIFTING DEEP HOLES Russian patent published in 1999 - IPC

FIELD: deep hole working in different branches of machine engineering and instrument making. SUBSTANCE: apparatus includes body with opening for arranging drift and pusher of drift drive and secured to body guiding device for pusher. Guiding device is in the form of two plates rigidly connected one with another. Through prismatic grooves provided in parting plane of plates are designed for guiding pusher and two cylindrical rams. Rams are joined by traverse bar arranged in gap between plates with possibility of engaging with pusher. Pusher has reduced length. EFFECT: enhanced operational reliability of apparatus due to guiding pusher along its whole length. 3 dwg