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US Patent: 2,507,231
Screw Driver Having Cruciform Bit
Patentees:
Joseph J. Tomalis, estate of (deceased) - Providence, RI
Lillian Dolores Tomalis, administratrix - Providence, RI

USPTO Classifications:
81/460

Tool Categories:
screwdrivers : screwdriver blades

Assignees:
American Screw Co. - Providence, RI

Manufacturer:
Vaco Products Co. - Chicago, IL
Irwin Industrial Tool Co. - Wilmington, OH

Witnesses:
none listed

Patent Dates:
Applied: Oct. 29, 1947
Granted: May 09, 1950

Patent Pictures: [ 1 | 2 ]
USPTO pdf tiff
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"Vintage Machinery" entry for American Screw Co.
Description:
Watson, Cole, Grindle & Watson - patent attorneys

Original application 30 Dec, 1942. Divided and this application 29 Oct, 1947.

This patent pertains to the shape of the Philips style driver to allow for more torque on the screw with less cam out force.

The full marking on the shank is VACO Made U.S.A. //CHROME VANADIUM STEEL // PHILLIPS POINT No.3 // Pat. No. 2507231 Lic. No. 9

IRWIN 3000-3" Made in U.S. of A. (on handle)

Phillips//Lic. 7-Pat//2507231//Made in U.S.A.//No. 1 point//Carbon// (on shank)

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