GB268392A - Improvements relating to speed and distance indicators - Google Patents

Abstract

268,392. Mombur, G. March 27. 1926, [Convention date]. Counters actuated by electric and magnetic means; transfer mechanism.-In a speedometer having mileage counters a measuring or balance wheel, the movement of which is restrained by a spring, has imparted to it a succession of slight, equal angular displacements, separated by intervals of time which are a function of the speed to be measured. Fig. 1 shows an arrangement in which the displacements a.re imparted to the wheel 1 by magnetic means comprising an electromagnet 20 the winding of which is energized intermittently by a contact maker 29 on the speed shaft. The magnetic circuit passes through a spring-pulled member 21 which is pivoted on a shaft 22 and carries. on an eccentric pivot 26, a shoe 25 which is adapted to engage and displace the wheel 1 when the electromagnet is energized. Adjustable stops 24, 27 are provided, and the magnetic binding between the parts 21. 25 is relied upon to secure the desired action. A second winding 30 may be arranged to demagnetize the magnet 20 when the current is ruptured. Fig. 7 shows an arrangement in which an electromagnet 33, which is energized intermittently by an interrupter 29 on the speed shaft, actuates an armature 41 pivoted at 42. A dependent link 46 has a beak 48 adapted to ride over successive teeth on a ratchet wheel 49. As the link moves in passing a tooth, it engages the balance wheel 1 and imparts an impulse to it. An extension 45 acts upon the wheel as a brake. Total mileage and' trip mileage counters may be actuated from a suitable part of the mechanism such as the ratchet wheel 49, Fig. 7, or by a shoe similar to the shoe 25, Fig. 1, engaging a pawl controlled wheel. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the following subject-matter. The movement of the mileage registering mechanism may be communicated to a shaft 51, Fig. 11 (Cancelled) having a crank 53 carrying two pawls 54, 58, the former of which actuates a ratchet 55 of a total mileage counter 57, and the latter of which actuates a trip dial indicator and pointer. The pawl 58 has two noses, one of which engages a wheel 61 and advances a units and tens pointer over a dial. Onceeach revolution this nose engages a deep notch 61<1> and allows the second nose to engage another wheel and advance a " hundreds disc behind an opening in the dial of the instrument. Means are provided for zeroizing the trip register, and for varying the gear ratio of the driving mechanism- This subject-matter does not appear in the Specification as accepted.