GB546843A - Improvements relating to linear-dimension gauges - Google Patents

Abstract

546,843. Linear-dimension gauges. BOLTON, E. June 10, 1941, No. 7315. [Class 106 (ii)] Relates to internal gauges incorporating a dial indicator and having a fitting one end of which has a socket to receive a spigot on the indicator casing, and the other end of which is split so as to contract when placed in a hole to be gauged the movement being transmitted by an internal spindle to the feeler plunger of the dial gauge. A dial gauge 11 is provided with a supporting spigot 12 and also with a hollow spigot 14 preferably of the same diameter through which the feeler spindle 15 extends. The tubular extension of the gauge comprise a part 18 fitted externally with a hand-grip portion 19 and with a socket 20 to receive the spigot 14, and a part 22 the extremity 23 of which is adapted to engage the work 24. The part 22 is longitudinally split at 26. The extremity 23 is accurately machined for a given size, and the part 22 can be unscrewed and a similar part of another dimension substituted. The part 18 has in its interior a ring 28 through which the spindle 29 can slide, a spring 30 abutting between the ring and a collar 31 pinned on the spindle. The other end of the spindle has a hardened point 32 which enters the split extremity 23 to engage the sharp hardened internal edges thereof. When the part 23 is pushed into the work the split portions are contracted and force the spindle 29 to move the feeler 15 of the gauge. The gauge is centred by a spring-pressed sliding collar with tapered webs to engage the end of the hole. Specification 495,506 is referred to.