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A New Power Brake for "Heavies" The Peters-Girling System— a

15th November 1935
Page 81
Page 81, 15th November 1935 — A New Power Brake for "Heavies" The Peters-Girling System— a
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Simple and Well made Mechanism with an Air Cylinder for Each Wheel AMONGST private-car makers the Girling brake enjoys considerable popularity. Now it is probable that the system will be applied to commercial chassis. There are on view at Olympia examples of Girling brakes with airpower operation. They are shown, on Stand 106, by G. D. Peters and Co., Ltd., Windsor Works, Slough, the maker of the pneumatic apparatus, the brakes being a product of New Hudson, Ltd., Icknield Street, Birmingham. Instead of the usual cam, the shoes are expanded by a wedge (incorporating a self-aligning device) between two rollers, outside which are plungers On which the shoe tips bear. When the wedge is pulled sideways through the brake back plate, it forces the plungers and shoes outwards, the rollers reducing frictional losses to a minimum. In addition to the high degree of efficiency thus afforded, there is the advantage that when the Wedge is not directcoupled to the power cylinder the operating gear may consist solely of rods or Cables in tension, 'torsional crossshafts being eliminated, Adjustment can be carried out with the aid of a single spanner and without jacking up the wheels. The fulcrum end of each shoe is carried on a plunger, the end of which has in oblique face. Between the two plungers is a cone. with four flats machined on A. This member is screwed into the back plate, from the outside of which it can be turned. As it is rotated, a click occurs each time the flats come into contact with the plungers. It is necessary only to rotate this cone until it can be advanced no farther and then to turn it back until the nearest click is reached. The fiats on the cone provide automatically the correct clearance between the drum and the shoe facing, whilst preventing the cone from turning unintentionally. In the Peters-Girling power brake a small compressedair cylinder, with piston, is attached to the back plate of each wheel, the piston rod carrying the wedge which expands the shoes. Provision is made for connecting, by cable, the piston rod with the hand lever. • The pedal is coupled to a normal Peters air-control valve which has the important characteristic that the pressure operating the brakes is increased or reduced progressively as the pedal is pressed farther down or is allowed to come back. The system operates with a maximum pressure of 50 lb. per sq. in.

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