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US Patent: 1,512,231
Safety means for drilling machines
Patentee:
Oscar W. Mueller (exact or similar names) - Cincinnati, OH

USPTO Classifications:
408/129, 408/234, 408/710

Tool Categories:
metalworking machines : drilling and boring : drill presses : radial drill presses

Assignees:
Mueller Machine Tool Co. - Cincinnati, OH

Manufacturer:
Mueller Machine Tool Co. - Cincinnati, OH

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 05, 1923
Granted: Oct. 21, 1924

Patent Pictures:
USPTO (New site tip)
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Report data errors or omissions to steward Jeff Joslin
Vintage Machinery entry for Mueller Machine Tool Co.
Description:
The "Safety" in the patent title is the safety of the machine rather than the operator: the invention is an interlock to prevent drill-arm elevation adjustment when the arm lock is engaged.

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