Patent GB-690990-A (GB)
Title: Improvements relating to pre-set mechanisms
Inventor: SMALE NORMAN EDWIN
IPC: B67D7/08
Filed: 1949-07-27
Abstract: 690,990. Dispensing petrol. WAYNE TANK & PUMP CO., Ltd. Aug. 14, 1950 [July 27, 1949]. No. 19699/49. Class 116. [Also in Group XXIX]. A preset mechanism incorporates a gapped cam, a lever associated with the motor switch and the cut off valve and a latching device which allows the automatic cut-off valve to commence to close and subsequently to permit complete closure without stopping the electric motor. A spindle 20 is connected to the indicating mechanism by a universal coupling and to the driving shaft 21, which has at one end an inner sleeve 33 surrounded by an outer sleeve 282, and a terminal knob 30. The knob is keyed to the driving shaft 21 and to the sleeve 33, and a spring 29 is interposed between the sleeve and shoulder 283 to urge the teeth of clutches 271 and 281 into engagement. A disc 31, indicating gallons, is fixed to the sleeve 282 and a setting disc 28. The disc has a gap 284 in the periphery which can engage a roller 35 mounted on an arm 36 on a shaft 37 and having clutch teeth 281 which can engage the clutch teeth 271 on a pinion 27 which rotates freely on the driving shaft. The pinion 27 engages the eight toothed part 252 of a composite pinion. A gapped cam disc 23 and a driving disc 24 are fixed on-the driving shaft. The driving disc has a gap 242 in its periphery and has a peg 64 engaging a slot in a gapped disc 63 rotatable on the shaft 21. The disc 63 has pivotally secured thereto a mounting plate 243 with two interrupted teeth 241. The plate is secured by a spring 65 to the peg 64 which maintains the gaps 132, 242, in the discs out of phase. An arm 35 is secured to the other end of the shaft 37 which can engage the end of a lever 39 which at one end has a pin 40 engaging a sinuous slot 421 in a cam plate 42 pivoted on a shaft 43. A switch guide lever 44 mounted on a shaft 45 acts as a guide for the pin 40. A plate 46 on a shaft 47 coaxial with shaft 45 has a pin 461 engaging a slot 391 in the lever 39. A bell crank lever 48 is mounted on shaft 47 and is connected by way of a cable 49 to a crank arm 50 on shaft 51 having a second crank arm 52 for operating the cut-off valve. The cut-off valve, Fig. 10, comprises a stem 56 with a box in which is a rod 60 having a ball 61 seating on a spring 62 resting in a recess in a liner 58. A poppet valve 53 has a resilient seating 54 and is mounted on the stem 56 and has a sleeve 57 communicating with the space 563 surrounding the pilot valve and with ports 562 and with the riser. The sleeve 571 has ports 573 which can be brought into communication with ports 583. An annular passage 59 communicates with the delivery side of the meter. The rod 60 normally projects above the stem and a crank arm 521 engages the rod to unseat the valves and to put ports 573, 583 into communication. In operation. To preset for a predetermined amount of delivery the knob 3 is rotated to cause clutch teeth 271, 281 to disengage and to rotate the setting disc 28 until the required amount is registered. The driving motor is switched on through an arm 431 connected to the switch actuator. The crank 42 is rotated to cause the lever 39 to engage the end of the lever 38 and bell crank lever 48 is consequently rotated to operate the pilot valve and poppet valve to bring the ports into communication. As each gallon is delivered the two teeth 241 on the member 243 engage the trailing tooth of the four toothed pinion to cause the disc 63 to rotate, the movement being limited by a slot to bring the gaps in the two discs to coincide so teeth 252 engage and rotate the pinion 251 and hence the pinions 271 and setting disc 28. When the last half gallon is being delivered the roller 35 engages a gap 282 and the arm 38 disengages from the end of the lever 39 which rises partially closing the valve. After that a projecting tooth 392 engages the disc 23 and closes the valve completely. On switching off the motor, the lever slides and pivots about a pivot 68 and operates the bell crank lever to open the valve partially to relieve the pressure in the hose. If a further supply is required a knob 67 and lever connected to the bell crank lever 42 by a lost motion device is operated to open the valve. The apparatus is set to the further amount and the total amount is recorded. To zeroize. The driving disc 24 is turned backwards by rotating the knob 30. Two of the teeth 251 rest on the driving disc so that the composite pinion is locked against rotation. When the interrupted teeth 241 contact the pinion 251 the plate 243 is depressed to allow the teeth to slide over the pinion. In the provisional Specification an alternative arrangement is described in which a mounting plate with two teeth is pivoted to the driving disc and a raised member masks the gap until the pinion 251 rotates the plate about its pivot to expose the gap. Specifications 430,192. 690,991, [Group XXIX], and 691,008 are referred to.