Cutting by use of rotating axially moving tool – With stopping upon completion of prescribed operation
Patent
1989-07-21
1990-10-09
Howell, Daniel W.
Cutting by use of rotating axially moving tool
With stopping upon completion of prescribed operation
408 16, 408112, 408241S, B23B 4900
Patent
active
049616749
ABSTRACT:
A drilling guide for providing stability, direction, force and depth control for precise drilling comprises a hollow shaft attached to drill shaft casing, a telescopic housing connected to hollow shaft with a close coil spring, a depth measuring scale and a set of locknuts as depth controlling device. The threaded portion of hollow shaft provides means for depth measuring and controlling surface and nonthreaded portion and outward flange provides means for direction guidance for the housing. The housing which could protect adjacent objects from drilling relatively moves upwardly during downward movement of hollow shaft and stops at where locknuts are located. The housing comprises a serrated edge for aiding stability and vented holes for exiting drilling byproduct. The close coil spring can provide consistent resistance to prevent unexpected plunging of drill bit and can bring the drill bit back to the original position following the same path of drilling.
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