Patent GB-610332-A (GB)
Title: Improvements in or relating to a gauging device
IPC: G01B13/08
Filed: 1945-11-05
Abstract: 610,332. Linear- - dimension gauges. STEVENS, A. H. (Sheffield Corporation). Nov. 5, 1945, No. 29312. [Class 106 (ii)] A gauge, particularly for internal gauging, comprising a pair of relatively movable feelers, one of which can move yieldingly towards or from the other on a support and the other being capable of sliding adjustment on the support, a work-supporting means on which the support is yieldingly mounted for movement in the direction of relative movement of the feelers with respect to one another, the support having a receiving surface for carrying a spacing block of predetermined length and the support and the sliding feeler having abutment surfaces thereon for engaging the opposite ends of the spacing block, and indicating means operable in response to changes in position of the yieldably mounted feeler with respect to the support. The means for indicating the position of the movable finger comprises a pneumatic rate of flow meter of the type wherein a float is displaced upwartlly in a vertical tube by the flow of air. The apparatus comprises a housing 10 in which is a horizontal shaft 14 operable by a knob 17 to adjust vertically, through gearing and screws, a carrier 26 having arms 27 which support by depending spring blades 28 a support 29 for the gauging fingers 30, 31. The finger 31 is fixed on a block 32 slidable along the support 29 and lockable thereon by an eccentric pin device, the gauging position of the finger being determined by a spacing block or slip gauge 40 contacted by spaced abutments 39 on the support 29 and an abutment 42 on the block 32, means 37, 44 being provided to ensure that the block 32 bears against the slip gauge with a predetermined yielding pressure before locking. A block 52 carrying the finger 30 is supported by four spring blades 51 on the support 29. Located within a space below the block 52 is a member 54 mounted on the support 29 by spring blades and provided with a stem 58 received in an aperture in the block 52. A second stem 62 is received in an aperture in the support 29. Spring-pressed balls 61, 63 carried respectively by the block 52 and support 29 bear against the two stems, the former pressing the finger 30 towards the left and the latter urging the located member 54 to the right. The finger 30 has a projection 66 contacting a surface 67 in the member 54 constituting the outlet of a nozzle 71 in the latter, which is connected to the flow meter. When a master gauge is placed over the fingers 30, 31 to rest on a worktable 11, the finger 31 is so adjusted that both fingers engage the work and the finger 30 is capable, on release, of movement to the left; slip gauge 40 allows air to leak through the nozzle 71 by engaging an abutment 65 on the member 54 to move it to the left to lie flush with the abutments 39. A work-piece can be substituted for the master gauge and the dimension composed by noting the position of the float in the flow meter. Several slip gauges 40 may be used to build up the required distance between the fingers 30, 31. Excessive floating movement of the support 29 carrying the fingers is detected by two electric lamps, each arranged to glow according to the direction of the excessive movement of the support; a positive stop means 93 limits such floating movement.