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US Patent: 2,305,737
Boring Attachment for Milling Machines
Patentee:
James H. Richards - Glendale, CA

USPTO Classifications:
279/6, 407/45, 407/74, 408/181

Tool Categories:
metalworking machines : milling machines : milling machine tools

Assignees:
None

Manufacturer:
Fray Machine Tool Co. - Glendale, CA

Witnesses:
none listed

Patent Dates:
Applied: Jan. 21, 1941
Granted: Dec. 22, 1942

Patent Pictures:
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Fray Milling Machine
"Vintage Machinery" entry for Fray Machine Tool Co.
Description:
This invention relates to and has for an object the provision of a boring device for milling machines, comprising a head with a stem adapted to be held on the arbor of a milling machine and on which a micrometrically adjustable tool holder is mounted for diametrical movement so as to variably position a boring tool relative to the work, said holder being provided with a plurality of differently positioned sockets for removably receiving a tool stem, so as to maximize the range of a tool in a device of given size.

An important object is to provide a device of the character herein described which Will include an annular retaining member pressed or shrunk on the periphery of the head for reinforcing the tool holder against breakage when subjected to the strains occasioned by usage, and at the same time serves to retain and limit the movement of the holder against displacement.

A further object is to provide a tool holder having a base member formed with a reentrant groove diametrically across the face thereof and a tool holding member with a correspondingly formed rib on its adjacent side slidably engaging said groove, and a gib in said groove between one margin of the groove and the adjacent edge of said rib whereby a means such as a set screw may engage the gib instead of the rib when the holder is locked in a selected position for use, thereby preventing the impairment of an edge of the rib by frequent tightening of the set screw.

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