Compound tools – With screwdriver
Reexamination Certificate
2005-03-22
2005-03-22
Rachuba, M. (Department: 3723)
Compound tools
With screwdriver
C081S460000, C076S082000, C408S022000, C408S200000
Reexamination Certificate
active
06868572
ABSTRACT:
The invention provides a bit (10) for use with a rotatable tool, said bit including: a shaft (12) having a rearward end adapted to be held by a chuck of the rotatable tool, and a forward end (18) having cutting tips formed thereon; a reaming head (14) including a body having a bore (16) adapted to receive the shaft therethrough in a sliding fit, the body having a plurality of cutting blades (26) formed on at least one peripheral surface thereof; the bore and/or the shaft having formations thereon such that when the rearing head has the shaft operatively located in the bore the reaming head is rotationally locked into the shaft; the reaming head and the shaft being separable from each other to allow either component to be replaced independently of the other. The invention also provides a bit having a tip end and shank end for use with a rotatable tool, said bit having at least 4 blades (24) to engage ard drive a screw when said rotatable tool is rotated, each blade including at said tip end a bevel so as to form a cutter (22) at the extremity of said blade, each bevel and/or cutter being able to cut in the same rotational direction. The invention further provides a method of making a bit for use as a screwdriver and countersinker, said method including the steps of: 1) forming at least a four blade screw driving end onto one end of blank, 2) forming a bevel at the extremity of each blade, said bevel producing an inclined plane cutter.
REFERENCES:
patent: D170119 (1953-08-01), Hull
patent: 3186009 (1965-06-01), Simmons
patent: 3207196 (1965-09-01), Stillwagon, Jr.
patent: 4325153 (1982-04-01), Finnegan
patent: 4514117 (1985-04-01), Scott
patent: 4852196 (1989-08-01), Martin
patent: D333964 (1993-03-01), Alexander
patent: 3772995 (1996-01-01), None
patent: 4402619 (1995-08-01), None
patent: 3038465 (1998-04-01), None
patent: 2427160 (1980-02-01), None
patent: WO9801252 (1998-01-01), None
patent: WO9917908 (1999-04-01), None
English translation of French Patent Document 2,427,160.
Rachuba M.
Savetime Products Pty. Ltd.
Whitham Curtis & Christofferson, P.C.
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