GB594548A - Improvements in linear dimension gauges - Google Patents

Abstract

594,548. Linear - dimension gauges. SOCOMIN AKT.-GES., and ERNST, A. Jan. 10, 1945, No. 807. [A Specification was laid open to inspection under Sect. 91 of the Acts, July 16, 1945.] [Class 106 (ii)] In a linear-dimension gauging instrument, a contact member which engages the work extends into a gauge chamber containing liquid which is forced by the contact member into a circular tube provided with a scale for measuring purposes. The instrument comprises a base-plate to receive the work, and an integral upright post on which is adjustably mounted a horizontal support for a vertically adjustable gauging chamber. As shown, a clamp 37 on the horizontal support is provided with a bush 39 in which is a hollow shaft 40 integral with a liquid chamber 51, the shaft being adjustable by means of a setting-sleeve 45 engaging threads on the shaft and the bush of different pitches, whereby rotation of the sleeve results in vertical displacement of the shaft. A piston 52, integral with the work-contacting member 53, is adapted to compress the liquid in a space 67 to force it into a tube 71 which passes through a closure , member 65 for the chamber 51 and runs round the edge of the member 65. A circular scale over the tube 71 covered by a glass cover 74 is provided, and a top metal ring 73 retains the cover on the member 65. A circular metal mirror 79 pivoted on a bracket 77 can be adjusted so that the reading of the liquid on the scale can be seen therein from the front of the instrument. The lower end of the contact member 53 has fitted thereto a ferrule 54 having a hardened contact point 56, and a tapered flange 55 adapted to be engaged by a hook-shaped member 62 on a lever 61 pivoted to the hollow shaft 40 for the purpose of lifting the member 53. The upright post is screwthreaded, a nut thereon adjusts the position of the horizontal support and the latter is provided with a clamping-screw. In a modification, the upright post is plain, the liquid chamber is in screw-threaded engagement with the bore in the end of the horizontal support to allow fine vertical adjustment, and a plain work contact member engages, under the action of a light spring, the diaphragm of a liquid chamber with which the measuring tube communicates. The scale comprises a rotatably adjustable plate. In a further modification, the liquid chamber is mounted to be swung relatively to the horizontal support so that the contact member can be brought into engagement with rotating work in a machine.