B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
77/30
B23B 51/00 (2006.01)
Patent
CA 1104845
ABSTRACT A drilling tool comprising a central, laterally flattened primary drill adapted to produce a cylindrical main drillhole and a secondary drill, pivotable relative to the primary drill, in a laterally outward direction to produce, in operation the undercut, a sleeve which concentrically surrounds the primary drill and is axially slidable on the shaft of the primary drill against the action of a spring and a slotted link system adapted to effect pivoting of the secondary drill relative to the primary drill the tool being characterised in that the sleeve is constructed as a cage having a rear portion , adapted to guide it for axial movement along the shaft, webs extending from the rear portion in the general direction of the shaft axis and leaving large passages in the axial and circumferential direction, and an end ring which joins the webs at their outer ends.
331157
Boehm Edgar
Kirby Eades Gale Baker
LandOfFree
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