Patent GB-1071347-A (GB)
Title: Timing device
IPC: F16K31/48
Filed: 1964-06-02
Abstract: 1,071,347. Spring power storing mechanism; cams; toothed gearing; valves. UNION TANK CAR CO. June 2, 1964 [June 3, 1963], No. 22756/64. Headings F2K, F2Q, F2S and F2V. A timing device 40 for controlling the operation of responsive means comprises a shaft 80 rotated at a constant speed on which shaft are mounted for movement transversely thereof an actuator plate 95 and associated circular actuator cam 92 and a return plate 110 and associated snail type energizer cam 91. The plates 95, 110 are connected by a pair of springs 130 engaging lugs 131, 132 of the plates and guided for relative movement by dimples 124 on the plate 95 and fingers 125, 127 formed on the plates 95, 110 respectively. The fingers also act as stops for relative movement of the two plates. Each plate 95, 110 carries a cam roller 101 (not shown), 113. The cam roller 113 is circumferentially adjustable about the shaft 80 by means of set-screws 154 housed in ears 150 of the shaft co-operating with inclined faces formed in a collar 153 of the cam 91. By the anticlockwise rotation of the shaft and the cam 91, the cam roller 113 and the plate 110 are urged downwardly tensioning springs 130 until cam roller 101 (not shown) engages in a cut-out 145 with circular cam 92 whence the plate 95 is urged downwardly under the spring loading to' actuate the responsive means. Before cam roller 101 reaches the end of the cut-out 145, the cam roller 113 reaches a drop-off 141 on the cam 91 whence the cam roller 113 and the plate 110 are urged upwardly by a spring 122, the actuator plate 95 also being urged upwardly by the plate 95. A further device 41 comprising a rotatable shaft, cams and plates similar to the one abovedescribed, except that both cams are non- adjustably secured to the shaft is disclosed (Figs. 10, 11, 12, 13, not shown), the two devices actuating in sequence a drain valve and a rinse valve of a water conditioning system. The two devices are driven from a common source through gearing such that their respective shafts rotate in phase and once every twenty-four hours, the devices being disconnectible from the driving source by a clutch mechanism for re-setting the sequence (Fig. 4, not shown). Further provided is a mechanism for programming the devices for seven days, which mechanism comprises a disc 285 having spring-held therein seven day pins 287 each in one of two axial positions (Fig. 20). In one position the pins co-operate with one end of a lever 280 the other end lying beneath the actuator plate 95 to prevent actuation of the responsive means by holding the actuator plate in its elevated spring- loaded position. In the other position the lever is allowed to pivot away from the actuator plate 95 and thus the timing device 40 is allowed to function normally. The disc 285 is rotated step-by-step, i.e. once daily, by an arm 331 secured to the shaft 160 of the second device 41 and a cap wheel 332 which co-operates with one of the day pins whether the day pins be in their first or second positions. The disc is held against accidental rotation by a spring-urged lever 326 co-operating with the two lowermost of the day pins. The clutch actuating mechanism also actuates the lever 280 into its timing device locking position. The timing of the actuation cycles is determined by the manual setting of a calibrated dial, a knob in frictional drive contact therewith and the relative position of the cut-out in the cam 92.