GB179910A - Improvements in micrometer gauges provided with an indicating device - Google Patents

Abstract

179,910. Krupp Akt.-Ges., F. May 12, 1921, [Convention date]. Linear - dimension gauges. - In micrometer calliper gauges having an indicating-pointer and dial attachments to the movable contact member such contact member is associated with the screwed spindle, and the casing of the lever mechanism for the contact member is arranged symmetrically relative to the axis of the spindle and compa.ctly between the movable gauging face and the end of the screw thread on the spindle remote from the gauging face. The invention is described as applied to both internal and external gauges. In the first form, the casing E of the lever mechanism is rigidly mounted in a sleeve B<1>, Fig. 1, slidable against the resistance of a spring D within a hollow threaded spindle B. The thimble C attached to the spindle carries an abutment b' for a rod H, which at its other end bears against the movable bolt or pin G of the lever mechanism. The casing E is screwed tightly against a shoulder b<6> on the sleeve B', and rotation of the casing and sleeve are prevented by a stud a<3> engaging a groove b<5>. The sleeve B<1> is fitted with a ring b<3> which is forced against a shoulder b<4> by the spring D. The gauging-face e<2> is formed on the dial casing. For adjusting the gauge to zero, the thimble is turned to move in the abutment b<7> and the spindle part B against the resistance of the spring D, the sleeve B<1> being immovable by reason of the contact of the two gauging faces. The abutment b<7> moves the rod H to deflect the pointer F to the zero mark on the scale. If the thimble is turned in the reverse direction the sleeve B<1> and casing E are moved by the engagement of the shoulder b<4> with the ring b<3>. In the second form of gauge, shown in Fig. 2, the casing E of the lever mechanism is placed outside the bow A. The movable contact face h<1> is formed on the end of the rod H, which has a collar h<2> bearing against a shoulder b<9> on the sleeve part B<1>, while a ring J on the sleeve bears against an annular flange b<8> on the spindle part B'. This gauge has a wide range of adjustment. An internal gauge comprises a threaded spindle M, Fig. 3, with a thimble C attached to it, and a sleeve K adjustable over the spindle. The casing E is slidable within the spindle against the resistance of a spring N, and carries one contact face e<2>. A lug e<4> and notch m<2> prevent rotation of the casing, and a collar e<5> on the casing abuts against flange m<3>. The pin G of the lever mechanism bears against a cap m<4> attached to the spindle part M, and the sleeve K carries a cap k<2> upon which interchangeable contact members k<3> may be mounted. In setting this gauge the thimble is held while the sleeve K is turned. Adjustment is made for a greater distance than the standard diameter of the boring.