GB1081775A - Micrometer - Google Patents

Abstract

1,081,775. Micrometers. FRATELLI BORLETTI S.p.A. May 13, 1965 [May 13, 1964], No.20313/65. Heading G1M. A micrometer has a counting mechanism wherein the numerals are carried on the outer surface of a series of flanged rings 42, 43, 44, 45 disposed coaxially with the calibrating rod 24 which passes through them, wherein the calibrating rod has an extension 27 with a micrometric screw thread and the rod is adapted to be rotated relative to a nut 31 fixed in relation to the body of the micrometer by means of a universal joint controlled by a rotatable control sleeve 14. In the embodiment shown, the main body comprises a zone 3 housing the counting mechanism and a member 7 rigidly fixed thereto with an extended portion 8 screw threaded at 9 to receive nuts 10, 10'. Around the extension 8 is a bushing 12 rigidly fixed to the interior of sleeve 14 for rotational but not axial movement. An inner sleeve 18 is fitted inside the control sleeve 14, the inner sleeve having longitudinal grooves 19 in which can slide the ends of two diametrically opposite pins 21 on a collar 22. The collar is mounted by a pin 25 on the end 23 of the calibrating rod to form a universal joint. When the control sleeve 14 is rotated; the universal joint rotates and thus the calibrating rod 24 which moves along its axis due to the engagement of the screw threads 27, 28. Rotation of the control sleeve 14 is transmitted by an internally toothed wheel 32 to a wheel 33, a shaft 34, a wheel 35, a wheel 36 Fig. 3 (not shown) and finally to a wheel 37 fixed to a disc 40 actuating the numbered rings through a tooth 41.