Patent GB-260656-A (GB)
Title: Improvements in or relating to wheel brakes for vehicles
IPC: B60T11/04
Filed: 1925-07-20
Abstract: 260,656. Pugh, J. V., Anstey, F., and Rudge-Whitworth, Ltd. July 20, 1925. Force-transmitting mechanism. - In applying brakes to wheels at both ends of a vehicle by a single pedal &c., resilient means capable, of being initially stressed to a detemiined degree, are interposed in the connections to the rear wheel brakes so that when a braking force has been obtained sufficient to overcome the spring tension the increase, in braking action on the rear wheels is less than that on the front wheels. As shown in Fig. 1, a stressed spring a<4> is mounted on an extension of a rear-wheel brake rod a passing through a tapering hole in the end of an operating arm a<1> mounted on the pedal shaft a<2>. The stress on the spring is adjusted by a nut a<5>, and a nut on the other side of the arm a<1> takes the thrust of the spring and may be used to adjust the brake, or the rod may be screwed into the part a<7> and locked by a nut for this purpose. In Fig. 3, a brake rod c, c<1> is provided with a spring box comprising, two parts c<2>, c<3> one screwed into the other to allow adjustment of the tension of the spring c<4> which abuts against two lock nuts c<5>. The part c<1> of the rod is screwed into the part c<3> of the box. This spring-box devicer may be modified for a rod acting in compression,. by providing a collar on the part c, immediately inside the box and abutting against the spring. the other end of the spring abutting against the other end of the box. In a. further modification, the ends of the parts of the brake rods d, d', Fig, 6, are screwed into nuts d<5>, d<8> enclosed by a spring box d<3> having a screw plug d<2> to adjust the tension of the spring. In a further modification shown in Fig. 7, a cylindrical member e<1> is screwed on the end of a brake rod and slidably mounted thereon is an abutment piece e<2> engaging, by means of a knife edge, a groove in the eye piece of a brake-lever arm b<3>. A collar f on the member e<1> retains the piece e<2> in position. A spring e<4> surrounding an extension f of the member e<1> and adjusted by a nut f<2> engages the end of the abutment piece e<2>. The extension f<1> mav be screwed into the part e<1>, a pin passing through both parts the ends of which slide in slots in the abutment piece e<2>. This pin may be of larger diameter in the centre part than the slots, which are provided at the one end with holes large enough for the pin to pass through. Alternatively, the pin may have a central notch engaged by the end of a rod h, Fig. 13. Splines may be used for guiding in place of the pin. Various other arrangements of adjusting and locking nuts, springs, and abutments are described. In a modification of the invention applied to motor cycles, the brake transmission rod to the rear-wheel brake passes through an aperture in an arm on the foot lever shaft, this arm being held between a spring encircling the shaft and a nut on the end of the shaft. A Bowden wire connection is employed for the front brake. In another construction, the spring o, Fig. 18. encircles a tube m<2> and is compressed between a fork eye m<3> on the brake lever n and having a pin-and-slot connection with the tube m<2>. and a nut o<1> screwed on the tube. Nuts m<7> are adapted to adjust the effective length of the brake rod m which enters the tube m<2>. The invention may be employed for a vehicle in which the steering of the wheels modifies the braking action as described in Specification 219,419. Springs in tension or rods in torsion may be employed as the resilient means. A shaft may be torsionally deflected by a tube fixed to one end and engaging the other end by a one-way stop device. Specification 15979/12 also is referred to.