GB200822A - Improvements in micrometer gauges for measuring internal and external dimensions - Google Patents

Abstract

200,822. Johansson, C. E. July 11, 1923. Addition to 196,925. Indicating.-Linear dimension gauges according to the parent Specification are modified by mounting the rough measurement pointer 10 and the accurate measurement pointer 16 on a common pivot 34, and providing flat springs 35, 36 tending to move them against a stop 37. For measuring internal dimensions the adjustable contact member or anvil 4 is mounted in an arm 33, and the movement of the sliding contact member 5 is transmitted to the pointers by a lever 38 pivoted at 39. The pointers bear on the lever at 45, 46. the dimensions being such that the end of the pointer 16 moves through, say, ten times the distance covered by the end of the pointer 10. The accurate measurement pointer 16 performs movement only during movement of the rough measurement pointer 10 in the vicinity of its zero point on the scale. Bearing edges 44, 45 are carried by adjustable slides on the lever 38, so that the relative movements may be adjusted, and the arrangement of the lever enables long holes of small diameter to be measured. In a form for external gauging the adjustable contact-member 4 is mounted on an arm 33<a> as indicated in broken lines.