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US Patent: 36,903
Improved Guide Attachment for Taps, Reamers, &o.
Tapping Guide
Patentee:
Wm. Swain Hadley - Norwalk, OH

USPTO Classifications:
408/112

Tool Categories:
tool holders

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
G. W. Reed
J. W. Coombs
E. A. Pray
O. E. Kellog

Patent Dates:
Granted: Nov. 11, 1862

Patent Pictures:
USPTO pdf tiff
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Description:
This is simple guide used to ensure that hand taps enter the hole perfectly straight. The big improvement here is the addition of a spring to hold the guide in place as the tap advances.

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