Patent GB-184489-A (GB)
Title: Improvements in or relating to brakes for vehicles
IPC: B60T8/54
Filed: 1922-08-12
Abstract: 184,489. Hallot, P. Aug. 13, 1921, [Convention date]. Void [Published under Sect. 91 of the Act]. Clutches, friction; universal joints and like couplings.-Relates more particularly to brake mechanism wherein a drum frictionally engaged with a running wheel or axle of a vehicle wholly or in part by centrifugal action, has applied thereto by the driver, friction members which constitute the braking means or which are moved by the drum to apply the brakes. In one form the brake drum has a flange which is gripped between a plate fixed to the vehicle wheel and an annular disc with the constant pressure of springs and the speed-variable pressure due to centrifugal masses mounted on levers which engage the disc. If when the brake segments are applied by the driver to the drum, the drag of these segments exceeds that of the discs the drum will be stopped and the braking effort is determined by the pressure on the discs which falls to that due to the springs if the wheel tends to become scotched. The centrifugal clutching and braking means may comprise a pair of segments which grip the drum by the action of springs a.nd of centrifugal masses mounted on bell-cranks pivoted on the disc fixed to the wheel. The bell-cranks engage lugs on the segments with which also engages a driving lug on the wheel disc. As shown in Fig. 33, the brake member controlled by the driver com prises an external band b and the centrifugally controlled clutch and brake means comprises a pair of segments a<1>, a<2> pivoted at c<1>, c<2> respectively within the brake drum f and engaged therewith by lugs k<1>, k<2> on levers f<1>, f<2> also pivoted at c', c<2>. A constant force is applied to the levers f<1>, f<2> by springs h', h<2> and a speed-variable force by weighted arms on spindles l<1>, l<2> which are connected by cranks and links w<1>, w<2> to the levers. In another form the centrifugally controlled clutch and brake means comprise an external band one or both ends of which are attached to a weighted lever or levers. In another form two pairs of segments disposed in parallel planes engage the interior of a drum, one pair of segments on fixed pivots being controlled by the driver and the other pair being engaged by direct centrifugal action and by springs. In Fig. 39 segments 130 can be applied by the driver to a drum 131 which is engaged with the drum 131<1> fixed to the wheel, by blocks 136 pressed against the drum 131<1> by springs 137 and by centrifugal action. Fig. 47 shows brake segments 211 arranged to act in part upon a drum 202 fixed to the wheel and in part upon a drum 237 driven by a centrifugal clutch device. Figs. 57 and 61 show two somewhat different mechanisms whereby the rotation of a centrifugally clutched drum is used to apply brakes. The drum 430 keyed on the shaft H driven by worm-gearing 302 from the Cardan shaft 300 of the vehicle drives, with freedom of radial movement, the masses 131 which, under the action of centrifugal force and it may be also that of springs r, engages the drum f. A pair of segments 437 are pivoted at 204, 204<1> upon an arm 205 keyed to a shaft h. The segments 437, can be applied to the drum f by rollers on an arm 212 keyed on a shaft 207 carrying an arm 220 to which the operating pedal is connected. The shaft h is connected to the brakes M, AR on the driving wheels by the arm 208 and lever P‹ and to other brakes AV by an equalizing differential gear D<0> and shafts i, i<1>. When the pedal is actuated to apply the brakes a complementary force is applied thereto by the action of the centrifugal masses which however disappears or is reduced to that due to the springs if the wheels tend to scotch. Fig. 65 shows a pair of segments 7, 7<1> pivoted at 6, 6<1> to an arm 5 freely mounted upon the driving shaft 2 and adapted to be forced by the pedal, the rod F and lever 10, against the drum f which is clutched to the shaft 2 by centrifugal masses. The brakes are connected to the lever 10 through the connections P, 9, 8. Internal segments with an expanding cam at their adjacent ends may take the place of the external segments 7, 7<1>. Fig. 48 shows a belt C which is adapted to be tightened about a rotating drum by levers L8, L3 connected to one end so as to apply brakes connected to its other end by levers L4, L9. The belt is released from the drum by springs R<5>, R<6>, R' attached also to the casing C<1>. Transmitting mechanism for brakes on vehicle steering wheels whereby interference with the braking by movement of the wheels is prevented. As shown in Fig. 2, the cam 2 for expanding segments against the drum is disposed in the steering axis x, y and has spherical sides and ball bearings; a connection 4<1> completes the universal joint. The cam shaft 5 is free to slide in a bearing 8 on the axle 6. As shown in Fig. 25, a universal joint 3 is interposed in the cam shaft in the steering axis x, y, and the shaft part 5 is free to slide, in the socket 180 which has a ball or other universal joint connection 186 to a part 182 which may be arranged to slide vertically under the influence of springs 184 or a dcsh-pot 185 in a, support Q<1> on the chassis or axle. The operating arm may be disposed at 9 or 9'. Another Figure appears to show the shafts 3, 5 connected by universal joints to a pair of links which are connected together by a simple horizontal pivot. Figs. 43 and 44 show a universal joint for the cam shaft 3, 5 in which the part 5 is fixed by a fork 90 on a ring 91 mounted on balls 92 on a shaft 93. The part 3 is fixed to a ring 97 which works on a ball race 96 on the ring 91.