Patent GB-585575-A (GB)
Title: Improvements in or relating to linear-dimension gauging apparatus
IPC: B07C5/06
Filed: 1943-07-15
Abstract: 585,575. Lineardimension gauging apparatus. SHEFFIELD CORPORATION. July 15, 1943, No. 11546. Convention date, July 3, 1942. [Class 106 (ii)] A linear-dimension gauging apparatus comprises a work support having a combined centering and gauging member which is tapered and which is adapted to be retracted to facilitate removal of the work. The latter, e.g., a shell, is placed on the support 13, Fig. 2, after this has been moved to the left to work-changing position by pulling a handle 19 to rotate a shaft 24 connected by levers 25, 26 to a carriage 15 which the support is mounted. The tapered centering and gauging member 32, Fig. 3, is secured to a slide 30 vertically movable in the support 13 and urged into projecting position by a spring 31. When the support 13 is moved to the work-changing position the centering member 32 is retracted into the support by a fixed cam 65, Fig. 2, engaging a lever 70 pivoted to the support 13 and operating the slide 30. When the support is returned to the gauging position the centering member 32 enters an aperture in the base of the shell to an extent depending upon the size of the aperture, a stud 37, Fig. 3, on a bar 36 fixed to the slide 30 opening contacts 38, 39 or 43, 44 if the size is above or below limits determined by the setting of screws 49, 40, bearing on the contacts. The contacts are connected in an indicating circuit described below. The depth of a recess 58, Fig. 4, in the shell 12 is gauged by a finger 52 in a lever 53, Fig. 3, pivoted in the support 13 by spring ligaments 54 and operating a gauging head of the kind described in Specification 551,956 and comprising two pairs of contacts operated by a plunger, both pairs being closed when the dimension gauged is the correct size, one or other opening when the dimension is over or under size respectively. The diameter of the recess 58 is gauged by a lever 59 pivoted at 60 to the support 13 and controlling a similar gauging head 63. The height of the shell is gauged by a head 78, Fig. 2. The diameter of the shell at the shoulder 86, Fig. 4, is determined by a pair of fingers 96, 97, the latter being carried on a block 105, Fig. 6, which contacts the plunger 104 of a gauging head 89 and is supported by spring ligaments 106 on a bar 102 carrying the gauging head 89 and attached by ligaments 103 to a bar 101. The finger 96,(not shown in Fig. 6) is also fixed to the bar 102, relative movement of the fingers 96, 97 thus moving the plunger 104 of the head 89. The bar 101 is so connected to a fixed part 100 by ligaments 99 that it can move vertically to operate the plunger 109, Fig. 2, of a gauging head 94 whereby the vertical, position of the shoulder 86, Fig. 4, is gauged. Fingers 110, 111, Fig. 4, are mounted to move horizontally to operate a gauging head 88 to test the diameter of the surface 85 and vertically to operate a gauge head 95 to gauge the vertical position of the shoulder 93. The diameter of the part 87 is gauged by a head 90 controlled by a finger arranged for horizontal movement only. The several gauging heads are connected in a circuit similar to that described in Specification 551,956. A separate red or green lamp is illuminated under the control of each head if the dimension concerned is within the given limits ; if over or under the respective red or green lamp only is lighted. If any one of the whole series of dimensions being gauged is outside the limits, a warning lamp is lighted. Specification 585,572 alsb is referred to.