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US Patent: 355,430
Rapidly-Adjustable Nut for Calipers and Dividers
Patentee:
Jacob D. Wright - Worcester, MA

USPTO Classifications:
33/558.08

Tool Categories:
layout tools : calipers

Assignees:
Wright Machine Co. - Worcester, MA

Manufacturer:
Wright Machine Co. - Worcester, MA

Witnesses:
Chas. H. Burleigh
Ella P. Blenus
D. R. Barton

Patent Dates:
Applied: Aug. 25, 1886
Granted: Jan. 04, 1887

Patent Pictures: [ 1 | 2 ]
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Description:
This is an improvement to the earlier E. Wright patent (#69,292 - 9/24/1867), which adds a quick-adjust nut to the adjustment mechanism. If the caliper legs are squeezed, the nut releases and can be slid to any point on the threaded rod.

Known examples are marked with the manufacturer's name and patent date.

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