Patent GB-287268-A (GB)
Title: Improvements in or relating to indicating mechanism applicable for use with apparatus for delivering measured quantities of liquid
IPC: B67D7/08
Filed: 1926-09-24
Abstract: 287,268. Shell-Mex, Ltd., and Lawson, J. Sept. 24, 1926. Counters actuated by independent agency; associated counters &c.-Indicating and counting mechanism applicable for use with measured quantity delivery apparatus, more particularly to the type of apparatus having a pair of containers alternately charging and delivering, comprises an indicating drum actuated by spring means wound up on the actuation of a setting indicator to the quantity to be delivered, and an escapement mechanism under the control of the change-over valve, adapted to be released in a step by step manner to permit actuation of the indicating drum by the spring means. The escapement mechanism is connected to a lost-motion device for actuating a totals counting mechanism and the indicating drum is adapted to be restored to normal upon the subsequent operation of the setting indicator. The mechanism is preferably formed as an independent removable unit. The setting knob is secured to a spindle 1, Fig. 9, on which is loosely mounted a barrel 3 provided with a setting drum 7 and with a bearing 4 on the casing 5, a spring 6 being attached at its ends to the barrel and bearing. To the spindle 1 is secured a sleeve 13 to which is attached one end of a spring 14 the other end of the spring being connected to a barrel 15 carrying the indicating drum 22. On the sleeve 13 is rotatably mounted an escapement wheel 21, Figs. 8, and 9, with alternate teeth 27, 28 in staggered relation. To the wheel 21 is secured a pair of ratchet wheels 11, 20 with which co-operate pawls 10, 17 pivotally mounted on the barrels 3, 15 respectively. The teeth 27, 28 co-operate with the bent-over ends 36, Fig. 5, of a pair of escapement levers 33 pivoted at 34 and held together by a spring 35. Upstanding cheeks 32 on the levers 33 engage the turned down projections 31 of a lever 29 pivoted at 30. The lever 29 is cut away at 37 to accommodate a ball-headed lever 38, Fig. 1 pivoted at 39 to a fluid-tight transmitting member actuated by a change-over mechanism such as that described in Specification 287,589, [Class 69 (i), Hydraulic apparatus &c.]. The lever 29 is provided with an extension 40 to which is pivoted a lever 41 one end thereof being movable in a slot 42, Fig. 7 of a fixed bracket and the other connected to a link 43 carrying pawls for actuating a totals counter 44 the counter not being actuated until the lever 41 is forced by a movement of the lever 29 to one or other end of the slot 42. A cam disc 46 carried by the barrel 3 is adapted to actuate a plunger to admit air to the suction side of the pump as described in Specification 272,985, [Class 102 (i), Pumps, &c.]. In operation when the setting knob is turned to set the indicator 7, through the arm 12 on the spindle and the abutment 121 on the drum 3, the springs 6 and 14 are wound up; the change-over mechanism is then operated and the levers 29, 33 are rocked in a step by step manner to release the escapement wheel 21 which, through the unwinding of the spring 6, effects the return movement of the indicator 7 and a movement of the drum 22 to indicate the quantity delivered. The spring 14 during this movement is not unwound so the sleeve 13 and barrel 15 turn together. On the succeeding setting operation the projection 19 of the pawl 17 is disengaged from the ratchet wheel 20 by a cam wheel 17 secured to the sleeve 13 and the indicating drum 22 is restored to zero position, a projection 48 thereon engaging a fixed stop 49 on the casing. The pawl 17 is maintained out of engagement until the return movement is completed by a resilient arm 24 attached thereto being forced over a ring 25 and remaining in engagement with its rim until it comes opposite the cut-away part of the ring at the zero position. By rotating the spindle 1 in the opposite direction the arm 12 is adapted to free the pawl 10 so as to reduce the amount set to be delivered.