Drilling and tapping screw

Details Drilling and tapping screw Drilling and tapping screw

1978-09-26

1980-09-16

Britts, Ramon S.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

408227, F16B 2500, F16B 3504

Patent

active

042226899

ABSTRACT:
A screw having drilling, tapping and fastening functions at the same time comprises a slender shank having a tool receiving head formed at the rear end of the shank, a drill portion integral with the front end of the shank and a helical cutting screw thread on the outer periphery of the shank. The drill portion is flat or platelike in cross section and is tapered toward its tip to provide a pair of sharp drilling edges. A pair of ribs extending longitudinally of the shank are formed on the opposite long side portions of the drill portion in symmetrical arrangement. The ribs prevent break of the drill portion during cutting while permitting smooth removal of chips.

REFERENCES:
patent: 3395603 (1968-08-01), Skierski
patent: 3463045 (1969-08-01), Prescott
patent: 3699841 (1972-10-01), Lanius
patent: 3786713 (1974-01-01), Sygnator
patent: 3861269 (1975-01-01), Laverty
patent: 4028987 (1977-06-01), Wilson

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