Self-drilling expansion drill

Details Self-drilling expansion drill Self-drilling expansion drill

1993-04-13

1994-03-29

Wilson, Neill R.

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

Having separate expander means

With hole forming means

411 51, 411 54, F16B 1304, F16B 1306

Patent

active

052979091

ABSTRACT:
A self-drilling expansion screw capable of being driven by a screw driving means comprises: (a) a screw shank having a first end and a second end, including: (1) an expansion hole extending a distance along the axis of the screw shank from the first end toward the second end; (2) a slot located on the expansion hole, for communicating the expansion hole with the outer periphery of the screw shank; (3) a holding portion, formed by a plurality of strip grooves provided at the outer periphery of the screw shank with respect to the expansion hole; and (4) a screw threaded portion provided between the second end and the holding portion; (b) a nut member screwed from the screw threaded portion; (c) a taper head having a coarse end and a small end, the small end inserted into the expansion hole, the holding portion expanding outwards while the taper head is pushed into the expansion hole; (d) a drilling bit provided at the coarse end; and (e) a coupling portion provided at the second end of the screw shank, for engaging with a screw driving tool so as to drive the drilling bit to rotate around the axis of the screw shank. By the way, the self-drilling expansion screw is able to be used for drilling, fastening, or fixing.

REFERENCES:
patent: 1342201 (1920-06-01), Beckwith
patent: 1449625 (1923-03-01), Phillips
patent: 3935786 (1976-02-01), Murray et al.
patent: 4575294 (1986-03-01), Mermi et al.
patent: 4990042 (1991-02-01), Szayer et al.

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