Patent GB-1197113-A (GB)
Title: Control and Counter Mechanisms for Liquid Dispensing Devices
IPC: G06M1/14
Filed: 1968-01-30
Abstract: 1,197,113. Dispersing liquids. ROCKWELL MFG. CO. 30 Jan., 1968 [1 Feb., 1967 (2); 16 Feb., 1967], No. 4618/68. Heading A4T. [Also in Division G4] A petrol pump has a dial reset lever 20 which must be operated before the pump lever 18 can be turned "on", resetting by lever 20 being prevented except when lever 18 is "off", Fig. 2, by a surface 98 on a cam 24 keyed to lever 18 blocking movement of an arm 48 of lever 20. In Fig. 2, lever 18 is locked by a shoulder 22 of cam 24 engaging a shoulder 26 of a latch 28. A gear segment 32, a lever 34, and a cam 36 keyed together are releasably held against a tension spring 38 by a pawl 40 engaging a shoulder 42 of cam 36, To zeroize spring-returned lever 20 is rotated clockwise so that a pin 50 thereon disengages parts 40, 42. Spring 38 then rotates parts 32, 34, 36 counterclockwise under control of a dashpot 43. Segment 32 drives a pinion 54 and a cam 58 keyed thereto clockwise which, through parts 60, 62 drives a disc 66 for resetting the dials through one clockwise revolution. As segment 32 rotates, a pin 70 thereon allows a latch 74 to move to the right so that a shoulder 78 bears against the rim of disc 66 and drops into a notch 80 thereof after one revolution (Fig. 6); and a pin 82 thereon engages a shoulder 84 of latch 28 to disengage parts 22, 26 (Fig. 6). The pump is turned on by rotating lever 18 anticlockwise (to the Fig. 7 position). A bidirectional anti-reversal pawl 86 engages a surface 88 of a part 90 keyed to lever 18 so that the later must be fully rotated in either direction. When lever 18 is rotated clockwise to shut off the pump and pawl 86 engages surface 88 (Fig. 8), shoulder 26 of latch 28 clicks past a shoulder 96 of cam 24 and pawl 40 engages shoulder 42 of cam 36 and pushes the latter ahead clockwise. This tensions spring 38, and causes segment 32 to rotate pinion 54 anti-clockwise, disc 66 being prevented from rotating by stops 92, 68. As segment 32 rotates clockwise, pin 70 engages latch 74 to release parts 78, 80. The gallonage and price dials, operated by lever 18, each comprise dials 120, 122, 124, Fig. 10, keyed to pin wheels 126, 128, 130, a follower 136 riding a snail cam 134 on the lower-order pin wheels 126, 128 on anti-clockwise rotation thereof during counting. As the lowest order dial 120 reaches "9", Fig. 10, and then "zero", a roller 138 on follower 136 rolls over the edge of cam 134 and kicks the latter anticlockwise. This causes clockwise movement follower 136, a disengaging arm 144, a transfer arm 146, and a transfer finger 156, the latter snapping a pin 168 of second-order wheel 128 up by one count (Fig. 13). As the lower-order dial counts to "9" again, finger 156 ratchets over pin 170 and the parts return to the Fig. 10 position. When lever 20 is operated to zeroize, disc 66 rotates a shaft 182 anti-clockwise and this pushes a slide 196 to the right (Fig. 14) which causes anti-clockwise rotation of parts 144, 136, 146, 156 (Fig. 14). Follower 136 disengages cam 134 and pushes an anti-reversal pawl 162 out of engagement with wheel 128 or 130 so allowing the pin wheels to return to zero by springs (209, Fig. 13). A pin 216 on finger 156 latches behind a surface 226 of a detent 218 (Fig. 14). On spring-return of lever 20, parts 182, 196 reverse their movement and parts 136, 144, 146, 156 rotate clockwise, finger 156 unlatching from detent 218 without a count resulting (Fig. 15). In a modification (Figs. 16-21), dial 120 and a disc (286) keyed thereto are mounted on a shaft segment (282) that has a lost motion relationship to a shaft segment (284) carrying pin wheel 126. From "0-9" positions of dial 120, a stop finger (290) rides on the rim of disc (286), and at "9", finger (290) drops into a notch (288) of disc (286) and stops dial 120. Wheel 126 rotates to take up lost motion and a count is transferred to wheel 128. As wheel 128 counts, pawl 162 and detent (310) latchet over pin 176 and through a linkage (300) lift finger (290) out of notch (288) so that dial 120 is snapped to zero.