US Patent: 448,089
|
| Micrometer Gage
|
|
Patentee:
|
|
| Laroy S. Starrett (exact or similar names) - Athol, MA |
|
|
Patent Dates:
|
| Applied: |
May 04, 1889 |
| Granted: |
Mar. 10, 1891 |
USPTO (New site tip)
Google Patents
Report data errors or omissions to steward
Joel Havens
L. S. Starrett Co.-125th Anniversary
History of the L. S. Starrett Co.
Biography of L. S. Starrett
"Vintage Machinery" entry for L. S. Starrett Co.
|
|
Description: |
| The object of this invention is to furnish a speeded micrometer in which the movement of the spindle toward and from the anvil by rotation is much more rapid than in those heretofore known, the instrument being at the same time rendered more sensitive than hitherto. These objects I attain by providing the outer end of the spindle with a milled projecting thumb-piece materially less in diameter than the milled hub at the end of the external sleeve, to which the finger and thumb are usually applied in rotating the spindle. This projecting thumb-piece may be either an integral part of the hub which closes the outer end of the sleeve or a part of the spindle itself prolonged through said hub, or a separate pin or plug extending into it. Another feature of this invention introduces into the cavity of the threaded barrel a coiled spring surrounding the spindle and serving to keep its screw-threads pressed back into such close engagement with the female screw as to avoid all backlash and insure the utmost accuracy. The screw-thread is preferably ratchet-shaped or with the incline mainly on one side, to present on the other side a square shoulder to the work. The spring is compressed between the bottom of the barrel and a defined shoulder or collar at the end of the threaded part of the spindle.
Used on Starrett #113 Micrometers.
|
|
