GB191412326A - Improvements in Micrometer Screw Gauges. - Google Patents

Abstract

12,326. Joriot, C. May 20, 1913, [Convention date]. Linear-dimension gauges.-The ordinary screw e of a micrometer gauge is provided with a loose sleeve h carrying a sector i in gear with a sector k carrying a pointer m moving over a quadrant scale o, so that the gauge may be used for accurate measurements by clamping the sleeve to the screw e by means of a set-screw p. For measuring articles of small dimensions, the article is first measured in the ordinary way between the contact-pieces f, g, and the sleeve h is then clamped to the screw e while the pointer m is at the end zero position shown in Fig. 5, to which it is normally returned by a weight z. The article is then removed and the screw e turned until the contact-pieces meet. For measuring between limits, or for articles of larger dimensions, the sleeve h is first rocked about the screw e by depressing knobs w on pivoted members r, s, the member s co-operating with another pivoted member u so as to engage the sleeve, and the member r engaging a stop x, Fig. 2, on the sleeve. This brings the pointer m to the central zero position on the scale o, as shown in Fig. 1, and the sleeve may be held in this position while the set-screw p is being tightened.