Patent GB-139818-A (GB)
Title: An improved systems and/or apparatus for automatically governing or controlling the speed of any rotary device
IPC: B60T8/32
Filed: 1920-03-05
Abstract: 139,818. Hallot, P. Dec. 6, 1913, [Convention date]. Automatic speed control; brakes, arrangement or disposition of. - In apparatus for controlling the speed of a vehicle or other device, comprising a drum adapted to be clutched to a running shaft of the vehicle &c. by centrifugal means so as to actuate a brake or other control means, the actuating connexion for the brake &c. is a band or cable adapted to be tensioned about the drum. The apparatus shown in Figs. 1 and 2 comprises centrifugal masses k disposed between radial guides i of a drum g fixed to the rotating shaft h and adapted to engage a loose pulley f around which is wound a cable b connected at one end c to a lever n, piston, treadle, or other operating member and at the other to a lever e to which is attached the operating-rod a of the slide valve of a steam-engine, brake or other governing device. When the shaft h is revolving rapidly there is added to the force applied directly to the end c of the cable a further force due to the frictional engagement of the masses k with the pulley f. The braking effort may be rendered only partly dependent upon the speed by winding the cable also around a drum fast on the running shaft as in Fig. 10, or by providing a separate cable wound on a fast drum. The cable may be endless. Fig. 7 shows an arrangement for a chaindriven motor-car. A drum g is provided on each shaft 10, 11 of the differential transmission and the cables b are connected to foot levers and to the brake lever 12. A vehicle having a driving or cardan shaft geared to a differential wheel axle may have a double drum on the driving shaft and separate cables on the drums connected respectively to brakes on the rear wheels and on the driving shaft. The Specification as open to inspection under Sect. 91 (3) (a) describes also the following subject-matter :-Figs. 12 and 13 (Cancelled) show brake mechanism for the front wheels of a motorcar. Brake shoes 116 carried by a plate 118 fixed to the pivoting axle 119 are apparently engaged by a cam 120 with the drum 114 fixed to the road wheel 113. The actuating lever 122 of the cam 120 is connected to one end of a band 124 encircling a loose pulley 123. The other end of the band is connected to a lever 126 to which is also attached the pull rod 125 and a spring 127 which ordinarily holds the band unstretched. A number of levers 129 carrying centrifugal masses 131 are pivoted at 130 on the side plate of the drum 114. The ends 132 of the levers 129 are adapted to bear against a washer 134 on the loose pulley 123. When a pull is applied to the rod 125, the band 124 is tightened around the pulley 123 and is further tensioned according to the speed. At low speeds, the action is limited to that produced by the pull of the rod 125, the pulley 123 merely acting as a guide-pulley. In order that the brakes may be operated identically irrespective of the position of the front road wheels, the operating lever 137, Fig. 14 (Cancelled), is connected to a rod 139 connected to a rod 140 pivoted upon the steering-bar 138. Pull rods 142 extend from the rods 140. This subjectmatter does not appear in the Specification as accepted.