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US Patent: 332,118
Adjustable Anvil for Micrometer Gages
Patentee:
Frank Spaulding (exact or similar names) - Providence, Providence County, RI

USPTO Classifications:
33/831

Tool Categories:
metalworking tools : machinist tools : measuring tools : micrometers

Assignees:
None

Manufacturer:
Brown & Sharpe Mfg. Co. - Providence, Providence County, RI

Witnesses:
M. F. Bligh
J. A. Miller, Jr.

Patent Dates:
Applied: Apr. 09, 1885
Granted: Dec. 08, 1885

Patent Pictures:
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Brown & Sharpe Time Line
"Vintage Machinery" entry for Brown & Sharpe Mfg. Co.
Description:
My invention relates to the adjustable anvils of all kinds of micrometer-calipers; and the object of my invention is to avoid a certain defect in such anvils as heretofore constructed. The purpose of adjustable anvils for micrometer-calipers is to compensate for wear in the instrument so as to maintain the zero position of the sliding scale. This has heretofore been attempted by the use of an adjustable anvil which rotates throughout its entire length, so that the anvil-face is varied in position with every adjustment. It has been found very difficult to construct these adjustable anvils with absolutely true anvil-faces and such imperfection, together with the effect of wear upon the anvil-face, has rendered the accurate adjustment of the implement exceedingly difficult if not impossible. In order to overcome this defect, I construct the adjustable anvils in two parts, one of which, the face part, has only a simple sliding movement, while the other, the screw part, turns and works in the screw-thread. Thus the anvil-face preserves at all times its original position, and if there be any defect in its construction such defect may be readily and accurately compensated for.

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