US Patent: 399,167 - Micrometer Caliper Square


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US Patent: 399,167

Micrometer Caliper Square

Patentee:

Laroy S. Starrett (exact or similar names) - Athol, MA

USPTO Classifications:

33/796

Tool Categories:

metalworking tools : machinist tools : measuring tools : micrometers

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

James H. Pond

Burnside E. Sawyer

Patent Dates:
Applied:	Feb. 01, 1888
Granted:	Mar. 05, 1889

Patent Pictures:

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Description:

The object of this invention is to provide a caliper-square graduated to minute fractions of an inch or meter, and having its movable jaw adjustable by a micrometer-nut, whereby subdivisions of such fractional parts of the unit of measure may be accurately ascertained. The instrument has also a movable binding-clasp recessed to receive the micrometer-nut, and is furnished with a spring extending from clasp to jaw and surrounding the screw on which the nut works. This spring takes up all backlash and limits the force with which the movable jaw is pressed by the nut against the work to be measured.