Patent GB-576002-A (GB)
Title: Improvements relating to gauging apparatus
IPC: G01B5/00
Filed: 1943-11-23
Abstract: 576,002. Gauges. BOWNESS, A. H. F. Nov. 23, 1943, Nos. 19540/43 and 2460/44. [Class 106 (ii)] A component to be gauged and a master component are supported with their axes arranged colinear or parallel with one another. A member movable in directions parallel to the axes and at right angles thereto, carries styluses adapted to engage the component and the master respectively. One stylus is supported for movement in one of these directions and the other stylus is supported for movement in the other direction, and indicators are associated with both styluses. Alternatively, one stylus may be fixed and the other supported for movement in both directions. In a further alternative, the component and master are movable and the member is fixed. In Fig. 1, the member C is rotatably and slidably mounted on a shaft 21, and the parts component and master A, B are supported at their ends by centres F or chucks. Styluses D, E are movable in axial and radial directions respectively, to indicate axial and radial variations. In a modification, C is rotatably mounted between centres carried by a sliding base. In other modifications, C is slidably mounted on vertical columns carried by a sliding base, and both styluses engage upper surfaces. In a further arrangement, A is arranged vertically over B. In Fig. 12, C is shaped as a bell-crank lever. In Fig. 15, undersize and oversize masters BI, B<2> are employed. Styluses D', D<2> associated therewith are hinged at 29, 28 for movement in horizontal and vertical planes respectively to indicate radial and axial variations. Lamp circuits are provided which may be closed by contact of the styluses with the various components to indicate the size of A relative to B<2>. Fig. 17 shows in plan view, a shaft 35 mounted for axial and rotational movement in vertical frames 36 rigidly interconnected by bars 37, 38 and a central bar immediately below the shaft 35. The member C is secured to the shaft 35. The centres F<1>-F<4> are carried by vertical arms mounted on bars 37, 38 to which they may be locked by screws 42. Lateral arms 43, integral with the vertical arms, adjustably engage recesses in the central bar connecting the frames 36, and may be locked thereto by screws 45. The centre F<1> can be moved to and from the centre F<2> by a pinion on the spindle 50 engaging rack teeth in the underside of the socket 49. The component to be gauged is arranged between F<1>, F<2> and a sliding stop 52, eccentrically mounted on a spindle 54, is moved to engage a datum face on the component and then locked in position by a screw. As spring 48 is stronger than spring 47, continuous contact between the component and the stop is assured. The master is arranged between a spring-mounted centre F<3> and a centre F<4> which is moved longitudinally until the datum faces of the master and component are in the same plane when tested by the styluses. Diameters and axial dimensions can now be compared. As shown in Fig. 20, stylus D is pivoted at 28 and one end is arranged between a plunger 64 abutting the movable element 62 of a dial gauge and a spring plunger 65 with adjusting nuts 61, whereby the stylus may be given an initial set, say 30 thousandths. D is pivoted with a 2 to 1 leverage so that errors recorded will be errors in diameter. Stylus E, Fig. 17, is pivoted for horizontal movement. Its end is arranged between the movable member 62a of a dial gauge and a plunger 65a, Fig. 17a, pressed against a stop by a spring 66a stronger than the gauge spring. The stop is contained in a slidable hollow-flanged plunger 71, the flange of which is pressed outwardly by a spring 72 while the head is engaged by a rocking lever 73, Fig. 17, the other end of which is arranged between a spring 74 and the inner end of a rod 75. The other end of the rod engages a rocking lever 76 which may be adjusted to bias the stylus by a handle 83. This handle is carried by an arm 82 secured to the shaft 36.