Patent GB-239685-A (GB)
Title: Improvements in apparatus for delivering measured quantities of liquids by volume
IPC: B67D7/16
Filed: 1924-08-22
Abstract: 239,685. Harvey, S., Budd, H., and Shand, H. Aug. 22, 1924. Fixed-chamber apparatus, varying quantity measured in.-Relates to apparatus of the type in which the measuring vessel is fitted with a vertically adjustable overflow weir adjusted by a handle moving in a vertical slot having branched horizontal slots, the rocking of the handle locking the weir and actuating the filling and discharge valves; and consists in providing wider horizontal slots on one side of the vertical than those on the other side together with a locking block to co-operate with the wider slots to prevent tampering with the apparatus. The overflow pipe 1 carrying the weir has formed on the end a rack 2 which is engaged by a spur wheel driven through gearing from a shaft 7 turned by a hand-wheel 8. On the pipe 1 above the bearing 3 in the casing 4 is fixed a platform 5 on which is mounted a bracket 6 carrying the shaft 7. The handwheel 8 and shaft 7 mav rock about the axis of the pipe 1, the movement being limited by a slot which is engaged by a pin 30 fixed to the floor 18 of the casing. The platform 5 is formed in one with a cam 13 which engages an enlargement 15 on a rod 14 which operates the valves, the rod being normally drawn down by a spring 16 so that the enlargement 15 bears on the cam. The hand-wheel is provided with an indicator which shows three positions corresponding to the filling valve being open, a neutral position, and the discharge valve being open. Fixed on the upper part of the pipe 1 is the control arm 19, and on each side of the pipe is a fixed spindle 20 on one of which is a series of angularly and longitudinally adjustable blocks 21 having a slot 22 adapted to be engaged by the arm 19. On the other spindle is a similar series of blocks 23, the slots 24 in which are under the slots 22. Mounted on the pipe 1 is a locking block 25 which is free to rotate relative to the arm 19 but can have no independent vertical movement apart from the arm. Assuming the arm 19 is in central position and the locking block in engagement with it, the weir can be raised. On the selected position being reached, the wheel 8 is swung so that the cam operates the rod 14 to open the filling valve when the control arm 19 will leave the locking block and engage one of the recesses 22. When the necessary liquid has been admitted, the control arm is swung in the other direction when it first closes the filling valve, next contacts with the locking block 25 and pushes it into a slot 23, the discharge valve being opened by the cam in this movement. After discharge, the arm 19 is swung back to central position, whereby the discharge valve is closed and the locking block also moved back to central position by frictional engagement with the arm 19. The arm 19, block 25 and recessed blocks 21, 23 are entirely enclosed in the casing 4 and an adjustable gauge bar is provided for, limiting the upward movement of the control arm. Parallel with the pipe 1 is mounted a shaft 31 carried in bearings 32 on the casing 4, and enclosed in a casing 33. The shaft is threaded to receive a series of longitudinally and angularly adjustable stays 34. A knob 36 outside the casing serves to adjust any selected stop, a window 38 being provided through which an indicator 37 is viewed to show the stop selected. An arm 39 moving vertically with the overflow pipe 1 engages the selected stop. In order to prevent movement of the pipe 1 until the gauge bar is set, a plate 40 is mounted below the lowest stop to overlie the arm 39 when the shaft 31 is in zero position.