US Patent: 239,072 - Spring-Calipers


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US Patent: 239,072

Spring-Calipers

Patentee:

Frederick J. Thomas (exact or similar names) - Athol, MA

USPTO Classifications:

33/558.08

Tool Categories:

layout tools : calipers

Assignees:

C. F. Richardson - Athol, MA

Manufacturer:

C. F. Richardson - Athol, MA

Witnesses:

Patent Dates:
Applied:	Jan. 07, 1881
Granted:	Mar. 22, 1881

Patent Pictures:

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Description:

Another quick-adjust mechanism for calipers and dividers, that uses a split nut to allow the legs to be quickly adjusted to rough size then finely adjusted to the exact measurement.