Patent GB-235387-A (GB)
Title: Improvements in brakes for road vehicles
IPC: B60T13/06
Filed: 1924-06-13
Abstract: 235,387. Royce, F. H., and Rowledge, A. J. June 13, 1924. Actuated by running axle or wheel; hand and foot actuation; forcetransmitting mechanism. In a vehicle brake system wherein the brakes, preferably on the rear wheels only, are directly applied, and a friction clutch driven by a running shaft of the vehicle is adapted, when operative, to actuate a rock shaft also connected to the brakes, the hub of the control lever, operated from the brake pedal, is connected with the hub of the lever which operates the brakes directly by interengaging saw teeth, so that movement of the control lever not only effects a direct brake application but causes also axial movement of the second lever, whereby the friction clutch is brought into operation. The brake application effected bv the friction clutch is arranged to take place both during forward and rearward travel of the vehicle, and the forces so transmitted to the brakes on the front and rear wheels are equalized. Provision is made whereby the direct brake application can take place in advance of or in unison with the application effected by the clutch. The apparatus is supported by a member b secured to the gear box. One member c<7> of the friction clutch, Fig. 4, is carried by an axially movable shaft c permanently geared to the road wheels, whilst a cooperating friction ring d<1> is carried by an axially movable shaft d, and a co-operating ring e<2> is carried by a sleeve e freely mounted on the shaft d but secured against axial displacement thereon by a member f<2> bearing against the member b. Alternatively, the shaft c and member c<7> may be secured against axial movement, and the sleeve e be axially movable. Pins e<5> compel the rings d<4>. e<2> to rotate together. The hub f<1> of the control lever f, freely mounted on the sleeve e, is provided with teeth engaging corresponding teeth on the hub g' of the lever g, which is connected to the rear wheel brakes through a rod g<2> and the means described below. The hub g<1> bears on a collar h slidably mounted on the shaft d and having teeth engaging corresponding teeth on a nut h<1> screwed on the shaft, the depth of the teeth corresponding to the requisite clearance between the clutch members, so that by adjusting the nut, wear of the clutch members can be taken up. Levers j, k, Fig. 3, freely mounted on the sleeve e and bearing on stops j<4>, k<4> carried by the sleeve are connected, through rods j<2>, k<2> to one arm l of a three armed lever pivoted at l<1> on a link l<2> pivoted to the member b, a spiral spring reacting between the member b and a nut on the shaft l<3> preventing too free movement of the link. A second arm of the lever l is connected through a rod l<8> and equalizing means to the front wheel brakes, whilst the third arm is connected by a rod l<7> to a lever m<2>, Fig. 7, mounted on a shaft m<1>. A second lever m<5>, connected to the rod g<2> and rigid with a lever m<4> connected through equalizing-means to the rear wheel brakes, is provided on the shaft. Interengaging teeth are provided on the levers m<2>, m<4> so spaced apart that the lever m<5> may rotate the lever m<4> for a direct brake application without affecting the lever m<2>, but when the latter is actuated by the lever l and rod l<4> it will rock until the teeth engage and then add force to the lever m<4>. When the lever f is actuated to apply the brakes, it rocks the lever g to apply the rear wheel brakes directly, and also moves it to the left, Fig. 4, whereby the shaft d is moved to the left to bring the friction ring d<4> into engagement with the member c<7>. Both the shaft c<7> and member c are then moved to the left until the member e<2> of the clutch is also engaged. The sleeve e is thereby rotated, and one of the stops j<4>, k<4>, according to the direction of rotation, carries one or other of the levers j, k with it to rock the arm l, which then applies the front wheel brakes and adds pressure to the rear wheel brakes as above described.