Patent GB-343442-A (GB)
Title: Improvements in or relating to brakes
IPC: F16D65/22
Filed: 1929-11-14
Abstract: 343,442. Brake bands and blocks acting on drums. MIDLAND STEEL PRODUCTS CO., Madison Avenue, Cleveland, Ohio, U.S.A.-(Assignees of Sneed, J. ; 6660, Mt. Elliott Avenue, Detroit, Michigan, U.S.A.) Nov. 14, 1929, No. 34823. Convention date, March 16. [Class 103 (i).] A rolling contact is provided between a brake shoe and the backing plate. The annular shoe 2 is spread by a toggle T having rollers 44 engaging the backing plate A. The shoe also rests on a rib R on the plate A at points spaced 120‹ from the rollers. The shoe when applied moves round with the drum, either end anchoring against an anchor P mounted on a raised part of a horizontal portion of the rib R and secured by an upsetting process. A return spring 110 connects the two ends of the shoe and holds them against the anchor P and springs 112, 113,'position the shoe, and are inclined so as to draw the shoe toward the plate A. Springs 112, 113 are so arranged that the flexible part of the shoe is first moved towards the drum. The spring 112 is connected by an adjustable clip 114, movable in a slot 117, to the plate A. The shoe is formed from T-section bar and part of the flange 5 is cut away to form a flexible part 9, the ends of the shoes are tapered, and an adjuster is mounted on apart 11 of the flange. The adjuster J, Fig. 1, comprises two plates one on each side of the flange 11, extended to engage the anchor P, and riveted to one another and joined by a pin 29 passing through an arcuate slot in the flange 11. The position of the adjuster is determined by cams 27 on each side of the flange 11, and non- rotatably mounted on a bolt 30 which clamps them in position. The inner sides of the cams are knurled so that they securely grip the flange. The toggle T operates the shoes by means of pins, 40, 42 mounted on the ends of the shoes, and which also carry the rollers 44. The pin 40 is mounted between the plates of the adjuster J and the pin 42 between the flange 5 and a plate riveted thereto and a cotter holds the pins against vertical movement. The toggle T comprises a female part 46 and a male part 45 joined by a pivot pin 47 to which the operating cable 60, Fig. 3, is connected by a yoke 48. The part 46 has one roller 44 between its ends and the part 45 has a roller 44 on each side. To facilitate assembly the part 46 engages the pin 40 by means of a fork and the part 45 engages the pin 47 by means of a fork. To prevent the toggle passing the dead centre position on the pin 47 a portion 50 joining the two portions of the female part 46 engages the end of the male part 45 and forms a new pivot, the pin 47 moving out of the bifurcated end of the part 45. The toggle will engage the backing plate before the toggle is drawn past the new dead centre thus formed. The cable passes through a conduit 68, fitting in a tubular bracket 67, and having cupped end fittings 66 having planed parts 71 and shoulders 69. The conduit comprises interfitting wire strands 63, 64 arranged to move laterally with respect to each other when the conduit curves. Specification 306,269, [Class 103 (i), Brakes &c.], is referred to.