Patent GB-169989-A (GB)
Title: Automatic governors for motor and other vehicle brakes
IPC: B60T8/32
Filed: 1921-10-05
Abstract: 169,989. Hallot, P. Oct. 6, 1920, [Convention date]. Addition to 139,818, [Class 103 (i), Brakes &c.]. Clatches, claw and friction. - Relates tc means such as de. scribed in the parent Specification for am. plifying the force ap plied for actuating vehicle brakes com. prising a band or cable in the connections which is passed around. a drum driven by a running shaft or axle of the vehicle, the effectiveness of the device being ren. dered dependent upon the speed by centrifugal means. As shown in Fig. 1, the cable 1 passes around a drum 2 mounted loosely upon the brake drum 3 and has its ends connected respectively to a foot lever or equivalent and to the cam lever 13 of the brake segments 12. A lever 7 weighted at 9 is pivoted at 8 within the drum and carries a roller 5 which at high speeds owing to centrifugal action opposed by a spring 11 engages an arm 4 extending laterally and radially from the drum 2 so that in these conditions the drum 2 is driven by the shaft 6 and amplifies the force applied to the cable for actuating the lever 13. The brake shown may be the rear brake of a motor-car and there may be a connection 15 from the lever 13 to actuate, the fore brakes. As shown in Fig. 3 the centrifugal device 9 is mounted outside the drum on a bracket 17 and engages a roller 18 secured to the drum 2. The cable 1 may be connected to the lever 16 of an internal brake or to the lever 20 of an external shoe, or both may be simultaneously controlled bv a spring or otherconnecting-member. Fig. 5 shows an arrangement for a motor cycle. A loose pulley 2 carried by a pair of side plates 22 secured to the shaft 6 is locked at high speeds to these plates by the members 24 having rollers 25 which under centrifugal action engage abutments 26 on, or it may be recessed in, the pulley 2 against the action of springs 27. The. cable 1 is connected through an equalizing lever 30 with the brake shoe 29<1> acting upon the brake rim of the motor cycle wheel and by the Bowden cable 31 with the brake acting on the fore wheel. The cable may be arranged in this case to apply an internal brake acting upon a rim which carries the pulley 2. The same parts may actuate also a brake on the wheel of a side car. According to the Specification as open to inspection under Sect. 91 (3) (a), the drum, Fig. 8 (Cancelled), about which the cable passes may be permanently coupled to the shaft 6 so that the drum acts upon the cable at all speeds when tension is applied to the end 1 of the cable, but the effect is rendered dependent upon the speed by forming the peripheral part, of the drum of a series of segments 43 adapted to move radially in a groove 44 under centrifugal action against the opposition of an elastic band. The effect of the drum on the cable may also be increased bv causing the end 1<1> of the cable to which the brake lever 16 is attached, as by a spring 52, to exert also a pull on the end 1 of the. cable to which the initiating force is applied. For this purpose the cable end 1<1> may be connected by a spring 51 to a lever 50 engaging an abutment 48 on the cable end 1. This subject-matter does not appear in the Specification as accepted.