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
Patent
1994-08-01
1996-05-28
Meyers, Steven N.
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
411386, F16B 2500
Patent
active
055204910
ABSTRACT:
A drill screw of the type suitable for fastening a sheet or plate to a lightweight steel frame member comprises a head portion, a threaded portion adjacent the head portion, a drill shaft portion adjacent the threaded portion, a large diameter drill portion adjacent the drill shaft portion, and a small diameter drill portion adjacent the large diameter drill portion. The small diameter drill portion has a smaller drill angle than the large diameter drill portion thus providing improved bite so that less thrusting force is required and the tendency to skid and drift is reduced.
REFERENCES:
patent: 4068554 (1978-01-01), Hirabayashi
patent: 4878788 (1989-11-01), Wakihira et al.
patent: 5120172 (1992-06-01), Wakai
patent: 5294227 (1994-03-01), Forster et al.
Meyers Steven N.
Miyagawa Kinzoku Kogyo Co., Ltd.
Pham Tuyet-Phuong
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