Patent GB-841179-A (GB)
Title: Improvements in or relating to control mechanism for a liquid dispenser
IPC: B67D7/08
Filed: 1958-02-06
Abstract: 841,179. Dispensing liquids. TOKHEIM (INTERNATIONAL) A. G. Feb. 6, 1958 [March 25, 1957], No. 3950/58. Class 116 [Also in Group XIX] Liquid dispensing apparatus comprises a spring actuated register resetting member, a control elem. ent adapted to rotate the resetting member to load said spring, connecting means releaseable by trip means being provided to connect the control element and resetting member, means for latching the control element in a spring loaded position, the latching means being released on conclusion of the operative rotation of the resetting member, a pivotally mounted handle controlling an actuator connected by a lost motion connection to the control element and means connecting the actuator to move the trip means to releasing position in response to movement of the actuator through a distance permitted by the lost motion connection. A dispensing operation is started by rotating a lever clockwise and stopped by the reverse rotation. As described, a known mechanism is modified as shown in Figs. 2 and 6 by the provision of members 52, 76, 56, 58 and associated elements. When it is desired to commence a dispensing operation, a lever 90, Fig. 13, is rotated to rotate a hub 54, Figs. 6 and 13 clockwise (Fig. 6) through about 106 degrees, a plate 56 attached to the hub 54 also rotating initially to an amount allowed by a lost motion connection comprising a slot 74A in the plate 56 and pin 74 attached to a bent link 76. A control pawl 64 also moves clockwise with the plate and by virtue of co-operating projections 60, 62 causes a trip pawl 58 to rotate clockwise, its projection 58A releasing a latch 59 to enable a cam disc 45 (the "resetting member") mounted on a shaft 23 to rotate clockwise under the action of a strong spring attached to a pin 71 on the cam disc 45. A pawl 49, Fig. 2, moves with the cam disc 45 to rotate a ratchet. wheel 21 which is connected to gearing driving shafts 11, 13 which are adapted to reset to zero four sets of indicator wheels (only two sets, 7, 9 being shown), which are clutched to a train of reset gears (not shown) during the resetting operation. The rotation of the cam disc 45 is mechanically damped by a dashpot 79. During the clockwise motion, a cam 119 on the cam disc 45, releases a pawl 95 from engagement with a tooth 35 on a ratchet disc 31 (the "control element") and a stop 121 on the disc 45 engages a projection 72 on the control pawl 64 to disengage the projections 60, 62, so that the trip pawl 58 is returned by a spring 113 to its initial position. The lever 90 may now complete its rotational movement to a position defined by the engagement of a pin 56A with the pawl 58 and the projection 58A with the ratchet disc 31. During this rotation a cam on the shaft 23 clutches the indicator wheels to the meter, and a cam 110, Fig. 13 operates the dispenser motor switch rod 40. The operator now releases the lever 90, and the ratchet disc 31 rotates under the action of springs until stopped by the tooth 41 of the latch 59. The mechanism is now in "running" condition and liquid may be delivered. When liquid delivery has been completed, the lever 90 is rotated counterclockwise firstly to take up the lost motion 74, 74A, Fig. 10, and subsequently to rotate the ratchet disc 31 to a position where the pawl 95 engages the tooth 39, thus preventing any return movement of the lever 90 in an operative direction when further rotation allows the motor switch rod 40 to open the motor circuit. The counterclockwise motion of the lever 90 is continued slightly beyond the stable initial position, Fig. 6, to ensure engagement of the pawl 95 with the tooth 35, return to the initial position being by action of the spring 73. The counterclockwise motion effects loading of the spring 73 and engagement of the reset train with the indicator wheels. Specification 829,717 is referred to.