Screwdriver bit for phillips-head fasteners

Details Screwdriver bit for phillips-head fasteners Screwdriver bit for phillips-head fasteners

1989-11-20

1991-03-12

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81436, B25B 2300

Patent

active

049984543

ABSTRACT:
A modified Phillips-type screwdriver bit is disclosed that is fully compatible with a standard Phillips-head fastener, and is designed to significantly increase the level of torque that can be applied to the fastener while at the same time substantially reducing the cam-out forces normally produced by a standard Phillips screwdriver bit. These results are accomplished by forming generated surfaces along the side walls of the bit wings so that when the bit is initially inserted into a standard Phillips-head fastener, lines of contact occur between the bit and recess adjacent and parallel to the roots of the bit wings. In this manner, the application of torque is confined to the sides of the bit wings even as applied torque levels increase.

REFERENCES:
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The Wall Street Journal, article "Does Henry Phillips, Bane of Handymen, Really Rest in Peace", Sep. 15, 1988.

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