Combined drill screw with reamer

Details Combined drill screw with reamer Combined drill screw with reamer

1994-06-23

1996-03-19

Saether, Flemming

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

408224, F16B 2500

Patent

active

054998964

ABSTRACT:
The present invention is a drill screw including a shank having a head at one end, a drill bit at the other end and a threaded section therebetween. The threaded section and the drill bit are operatively adapted such that drilling with the bit is performed by torquing the shank in a rotational direction opposite to that used to screw the threaded section into a bore hole.

REFERENCES:
patent: 296991 (1884-04-01), Mitchell
patent: 3682038 (1972-08-01), Lejdegard
patent: 4034641 (1977-07-01), Williams
patent: 4222689 (1980-09-01), Fujuwara
patent: 4645396 (1987-02-01), McCauley
patent: 4793756 (1988-12-01), Baumgartner
patent: 4958972 (1990-09-01), Shinjo
patent: 5046905 (1991-09-01), Piacenti
patent: 5403137 (1995-04-01), Grun

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