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New Proprietary Brake Sets
Page 81
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Complete Brake Layouts Incorporating Servo System Now Manufactured by the Clayton Dewandre Concern
AS a result of having frequently been called upon to assist manufacturers in designing brake layouts suitabie for use in conjunction with its vacuum-servo units on standard chassis, the Clayton Dewandre Co., Ltd., Titanic Works, Lincoln, has designed, and is now manufacturing, complete brake sets from the pedal to the brake drum.
The new system incorporates a small vacuum-servo unit of the floating type, specially designed for the purpose, but its maker stresses the point that the apparatus without the servo unit is mechanically highly efficient, and has gone so far as to assure itself of this by carrying out tests of the • lay:out without vacuum assistance.
Quoting from figures published by the concern,. Which were obtained from tests carried out on a car weighing 27 cw`t, with and without the servo unit, a pedal 'pressure of 190 lb. produced a retardation of 22 ft per sec, per sec. when the brakes were muscularly applied, whilst an identical retardation was produced by a pedal pressure of 110 Bo. with the servo in action. Lower down the scale, a retardation of 6 ft. per sec. per sec. was produced by pedal pressures of 16 lb. and 30 lb. 'in the two respective cases.
The arrangement of the brake system is as follows :—A single cross shaft mounted in self-aligning bearings carries double arias at its ends, to which are linked four cables to front and rearbrakes. Mounted on the shaft is a sleeve having arms at each end, one linked to the hand lever, the other to the pedal. The shaft is actuated by the sleeve through a master adjustment. Flexible conduits enclose the brake cables from the brake plates to their points of anchorage. Screwed adjusters are provided on the cable ends.
Each pair of brake shoes is anchored to a common pin, but it should be noted that, at the pivot, half bearings are not used. Both pivot and cam are carried by an inner and an outer plate, thus minimizing the possibility of distortion. The arm is riveted to the cam block and, with the exposed end of the cable, is enclosed in an oiltight pressed cover.
The vacuum-servo unit is of the floating type, and is so designed that the pedal lever can be mounted on the same bracket as the vacuum cylinder. The mechanism provides a straight pull, there being no offset levers.
Available at an attractive figure, the Clayton Dewandre complete brake equipment is claimed by its maker to be suitable for incorporation in the assembly programme of any chassis manufacturer without interference with production.