Tapping screw and mechanism of engaging member to be engaged usi

Details Tapping screw and mechanism of engaging member to be engaged usi Tapping screw and mechanism of engaging member to be engaged usi

1996-12-18

1998-06-30

Wilson, Neill R.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Pilot end having means enhancing fastening or installation

411416, 411418, F16B 2500, F16B 3504

Patent

active

057723745

ABSTRACT:
A tapping screw engages a member to be engaged with a base plate made of metal by tapping a burring hole formed on the base plate. The tapping screw includes a main body having a shank and a head formed at a base end of the shank. A reduced diameter shank portion extends from a fore end portion of the shank of the main body, and has a taper angle .theta. of 9.degree. to 14.degree. and a substantially rounded triangle shaped cross-section. Recesses having no thread are formed at three faces of the reduced diameter shank portion so that a circumferential width of each recess is gradually reduced toward a tip end of the reduced diameter shank portion. Each recess is formed by a steep face facing a screwing direction of the tapping screw and a gentle face oppositely facing the steep face to form a groove.

REFERENCES:
patent: 3812639 (1974-05-01), Sygnator
patent: 4486135 (1984-12-01), Kazino

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