Patent GB-190325837-A (GB)
Title: Improvements in Breaks.
Inventor: HALLOT PAUL
Filed: 1903-11-26
Granted: 1904-02-18
Abstract: 25,837. Hallot, P. Nov. 26. Brakes.-Relates to brake mechanism in which the braking-power, derived from the motion of one of the vehicle axles, is increased as the speed and the load are increased, and without risk of skidding. The first operation of the brake mechanism produces a braking-effect which cannot exceed a predetermined amount, and its continued operation produces a supplementary effect by means of centrifugal clutches, so that its extent depends upon the speed of the axle. The brakes are applied by winding a rope q, Fig. 1, on a drum n driven by a friction clutch on the axle. The clutch, actuated by compressed air, vacuum, fluidpressure, electric, or other means, or by hand, consists of a drum n, Fig. 3, carrying the rope q which actuates the brake lever. On first application, the drum approaches a cone 4, connected by means of corrugated discs 15 to a sleeve 3 which is keyed to the axle. The resilience of the cone is regulated to adjust the first tension of the rope by screwed bolts and springs 16. On further applying the clutch lever, the pulley n comes against a second cone 5 carried on a loose drum 7 bearing on rollers 18 against a collar on the fixed sleeve. This drum is rotated by centrifugal masses 9, carrier round by radial arms in the fixed sleeve 3, which masses press a metal band 11 against its inner surface. The band 11 is driven by projections which meet the radial arms. The tension of the rope due to the second application varies with the speed of the wheels, and skidding is thus prevented. In a modification, shown in Fig. 6, two pulleys coupled together by clutch teeth 46, and actuated by two clutch levers at o, o', on first application meet a friction surface 45. A second application, overcoming springs 52, engages friction shoes with a loose pulley 48 driven by centrifugal masses 9 and a friction band 47. In another modification, shown in Fig. 8, the drum encloses the two friction clutches, the first of which, 54, fast on the axle is applied by a plunger 58, regulated by a spring 52, forcing apart springs 60, Fig. 9, which press the band 56 driven by the pulley 54 against the drum ; the second application brings into action the band 57 driven by the loose pulley 48, which is sleeved on the prolonged axle of the first pulley and driven by centrifugal masses 9. In another modification, shown in Fig. 14, the first application brings into action the clutches held by springs 76, on the left of the Figure, together with the centrifugallydriven loose pulley and band 56, 57, the second application bringing the right-band clutches and springs 76 into play. Fig. 10 shows a method of hanging the drums to allow vertical play, and also of connecting adjustably the operating-levers f, f<4> as well as the corrugated dust-proof connection between the two drums. Another method of connecting the pulleys by lugs and links is shown in Fig. 11. The power of the brake is adapted to the load, i.e., to the varying distance between the axle and the bottom of the vehicle, by the flexible-lever system 39, 40, Fig. 5, which, by means of the rope 34, alters the point of application of the brakeoperating rope q on its lever V. The brake-shaft lever 23, here shown coupled to an operating-rod 22, is connected with the clutch fork f by a link and lever, and a rope led over a pulley 28. In this rope, a spring 29 may be introduced. The force applied by the brakesman is varied to suit the load by adjusting the spring i, Fig. 1, by the nut k according to the index m. The clutch lever is adapted to be applied during shunting, or on emergency by hand as shown.