Toolholder for grinding flat tip of screwdriver into hollow grou

Details Toolholder for grinding flat tip of screwdriver into hollow grou Toolholder for grinding flat tip of screwdriver into hollow grou

1986-11-26

1988-11-29

Schmidt, Frederick R.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51220, 51221R, 269 91, 269303, B24B 1900

Patent

active

047871776

ABSTRACT:
A toolholder for use in connection with the grinding of a conventional flat tipped screwdriver into a screwdriver having a hollow-ground tip configuration. The toolholder has a first section with a recess for receiving the round shank of the screwdriver, a second section having an inclined surface with respect to the top surface of the first section and an abutment ledge against which the front end of the screwdriver is located during grinding. A clamping lever is also provided, having a bottom located recess which lies over the shank of the screwdriver and, with suitable fastening mechanism, holds the screwdriver in place and against the abutment ledge for grinding. The angle of incline defined between the top surface of the first section and the flat bottom of the toolholder is slightly more than 1/4 of the angle defined by the tip of the screwdriver. In addition, the angle of incline defined between the inclined surface of the second section and the top surface of the first section is equal to 1/2 of the angle defined by the tip of the screwdriver. The top edge of the abutment ledge is coplanar with the top surface of the first section of the toolholder.

REFERENCES:
patent: 1899489 (1933-02-01), Wickbergh
patent: 2317996 (1943-05-01), Landg
patent: 2362306 (1944-11-01), Ringzelli
patent: 2367494 (1945-01-01), Gebel
patent: 2604738 (1952-07-01), Ramey
patent: 2635398 (1953-04-01), Sohn
patent: 2893179 (1959-07-01), Sperow
patent: 4338749 (1982-07-01), Kiser

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