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US Patent: 30,009
Spring Dividers
Patentee:
Joseph W. Strange - Bangor, ME

USPTO Classifications:
33/558.07

Tool Categories:
layout tools : calipers
layout tools : compasses : dividers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
T. W. Porter
A. L. Simpson
J. S. Jenness

Patent Dates:
Granted: Sep. 11, 1860

Patent Pictures:
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Description:
This patent covers an adjustment mechanism for calipers and dividers, consisting of a sliding "collar" that holds the legs together. As the collar is moved up and down, the taper of the legs allows them to move in and out.

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