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US Patent: 382,348
Beam-Calipers
Patentee:
Charles E. Billings - Hartford, CT

USPTO Classifications:
33/806

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Billings & Spencer Co. - Hartford, CT

Witnesses:
Frederic C. Billings
William Eddy
H. R. Williams
G. G. Haddow

Patent Dates:
Applied: Mar. 06, 1888
Granted: May 08, 1888

Patent Pictures: [ 1 | 2 ]
USPTO pdf tiff
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"Vintage Machinery" entry for Billings & Spencer Co.
Description:
This patent covers a novel method of constructing a set of outside calipers, wherein the main beam is made by holding a slotted plate between two slotted bars. This not only protects the graduations from wear, but simplifies the construction.

This tool also provides a micro-adjust feature which is actuated by a spring. This same adjustment was used on a line of marking gauges produced but the same company.

Known examples of the tool are marked with the manufacturer and inventors name, as well as the patent date.

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