GB523795A - A new or improved caliper or gauge - Google Patents

Abstract

523,795. Linear - dimension gauges. VICKERS, A. E. Jan. 14, 1939, No. 1306. [Class 106 (ii)] Comprises a sliding calliper gauge in which one jaw is in one with a graduated bar, the other jaw being slidable on the bar and coupled by a fine pitch screw to a sleeve slidable on the bar and lockable thereto, a dial gauge being carried on the back of the sliding jaw or sleeve, the plunger of which engages a lug on the sleeve orsliding jaw so that relative movement between sleeve and jaw is indicated on the dial gauge. One jaw 10 is in one with a bar 11 graduated at half-inch intervals in the upper edge of which are cut notches 12 of truncated triangular form at half-inch intervals. The sliding jaw 13 is in one with or rigidly with a head. 14 having a sliding fit on the bar and carrying detachably secured to it a dial gauge 18. Slidably mounted on the bar behind the head 14 is a sleeve 22 connected to the head by a fine screw 30 moved by a knurled nut 33. A screw 26 passing through a lug on the sleeve engages the plunger 21 of the dial gauge, and is locked by a knurled nut 27. A bell crank 37 formed by plates at either side of the bar 11 has one arm parallel to the bar and pivoted at 36 to the sleeve, while the other arm is square to the bar and carries a cam 43 adapted to press a leaf spring 42 against the bar. Pivoted at 39 to the bell crank is a locking piece 40 having teeth 41 adapted to engage the notches in the bar. To set the gauge to a dimension, the screw 30 is operated to bring the head 14 and sleeve 22 together or separate them so that a maximum or zero reading is on the dial and the sleeve is released and together with head moved along the bar and locked at a spacing greater or less than the required dimension. The screw is then operated until the dial reading added to the reading on the bar gives the desired dimension.