Patent GB-256991-A (GB)
Title: Improvements in and relating to taximeters
IPC: G07B13/00
Filed: 1926-08-16
Abstract: 256,991. Jamar, J. Aug. 17, 1925, [Convention date]. Counters actuated by revolving mechanism ; numeral-bearing elements. - In a taxi meter arranged for mixed time and distance drive the clockworh and fares indicating counters are controlled by an independent spring drum and the numeral-bearing elements of the counters are formed as translucent bands to facilitate reading and permit of illumination from the interior. A spring motor, Fig. 1, comprising a spring 1 attached at one end to a drum 2 and at the other end to a spindle 3 serves to control the movement of a clockwork through a pinion 5, pawl 6, and pinion 7 and the actuating mechanism of the fares counter through a pinion 8. The clochwork movement is transmitted through a gearing 20 - - 22, Figs. 3 and 4, to a shiftable gear 17 comprising a ratchet wheel 19, a pinion 23, and a disc 25 slidably mounted on a spindle 24, and the flexible drive 9 from the vehicle wheel is transmitted through gearing 10 - - 15 to a wheel 16 loose on the gear 17 and carrying a pawl 18 in engagement with the ratchet wheel 19. To the disc 25 is attached a disc 26 adjustable relatively thereto by means of a set screw 27, Fig. 5; the disc 26 has a projecting pin 28 for engaging a finger 29 on the boss 32 of a toothed wheel 30 secured to the spindle 24 and a projecting pin 35 on the disc 25 is connected to a pin 34 on the boss 32 by means of a spring 33. In the normal disengaged position of the gear 17 the spring 33 maintains the finger 29 in contact with the pin 34. When the vehicle is hired and the gear 17 is moved to operative position, by withdrawal of the flag-operated latch 31, the gear is not effective to actuate the wheel 30 until the finger 29 again engages the pin 28. The wheel 30 co-operates with a pawl 37, Fig. 3, having pins 40, 41 which on each rise and fall of the pawl permit an arm 42 to make one revolution, said arm being geared to the wheel 8 of the spring-controlled drum 2. By this means a ratchet wheel 49, Fig. 6, is advanced one tooth for each revolution of the arm and operates an arm 51 and pawl 54 to actuate a ratchet wheel 58 driving through gearing 64, 65 the units indicating band 66 of the fares counter. The band is attached to drums 63, 67, the lower drum being geared to a spring barrel 70 which serves to wind up the band when it has moved to its fullest extent. For this purpose the retaining pawl 59 for the wheel 58 is released by a pin 73 on a wheel 61 driven by a pinion 62 secured to the wheel 58. The pawl 59 is retained in one or other of its positions by a latch 76 and is moved to engage the wheel 58 after resetting of the band by a second pin 74 on the wheel 61. Transfer mechanism.-Each complete movement of the band 66 is transmitted to the next higher band 90, Fig. 7, by means of a cam 79 on the spindle of the drum 70 and a lever 80 carrying a pawl 84 engaging a ratchet wheel 87 on the band-carrying drum 88. Associated counters, trip and total.-The shaft 12 of the vehicle drive transmission mechanism, through gearing 95 - - 98, actuates a total mileage counter 99 and a trip mileage counter 119, Fig. 11.