GB475562A - An improvement in brakes and their linings and method of affixing the latter - Google Patents

Abstract

475,562. Brake shoes and drums. SERLE, W. May 14, 1936, Nos. 13645, 26614, and 27486. [Class 103 (i)] Means for attaching a lining to a brake shoe or drum comprises a number of lugs projecting through apertures in the shoe or drum and engaged by means on the shoe or drum to effect the simultaneous securing of the lugs and the clamping of the lining to the shoe or drum. According to Fig. 1, the lining 5 has a series of lugs 6 extending through apertures in the flange 2 of the shoe and on each side of the central web 4 of the shoe. Pairs of bars 9, 10 slidably mounted, one pair on each side of the web, by means of pin-and-slot connections 13 have wedge members 11 which are caused to engage holes in the lugs upon turning pinions 20 geared to racks 15, 16 on the bars. The shaft of the pinion is mounted in the web of the shoe. In Fig. 4, the shoe is of box section and within it are pivoted at 27 a series of claws 31 which are adapted to engage notches formed in one or both sides of the lugs 6 on the lining 5. As shown, the lugs are arranged in transverse rows of three. The sleeves 30 which carry the middle sets of claws are each provided with a toothed segment 39 engaging a worm 41 and these sets of claws are connected to the end sets by links 33. By turning the end 44 of the worm, all the claws are thus engaged with the respective lugs to secure the lining to the shoe. In Figs. 8, 9, 11, hooks 68 pivoted at 67 on the shoe are adapted to engage holes in the lugs 6 and in lugs 66 depending from the shoe flange. The hooks are turned by longitudinally slidable bars 63, 64 having cam slots 65 engaged by arms 71 on the hooks. The bars are guided by pins and slots 76, 77 and are operated by a lever 73 pivoted at 73a to the shoe and connected by a link 75 to one of the bars. A springy member 79 engaging a projection on the pivot 73a holds the bars in adjusted position. The bars may instead be operated by a bell-crank 80 pivoted on the shoe and connected to a bolt 84 screwed into the shoe. In Fig. 15, the lining 5 after the lugs 6 have been inserted in holes in the shoe flange is moved laterally to engage undercut faces on the lugs with corresponding faces on the flange. The lining is moved by bars 90, 91 which have hooks 92 engaging the lugs 6 and are secured to screwed shafts 94 and upon turning these in the shoe web the bars are moved laterally. The several shafts are interconnected by crank discs 90a and links. In Fig. 18, the lining after insertion of the lugs 6 in the holes in the shoe flange is moved longitudinally by bars 99 having pockets 101 which receive the lugs, so as to engage undercut faces 98 on the lugs with corresponding faces on the shoe flanges. The bars are moved longitudinally by a link and lever 102 or a bell-crank and link 103 as in Figs. 8, 11. In Fig. 20, a brake drum lining is formed in segments 109 and is attached by lugs 114 which extend through holes in the drum 106 and are notched for engagement with projections 118 on a ring 117 which can be turned about the drum which may have an outer casing 107. Indicators and signals, applications of.-To indicate when re-lining is necessary an arm 97, Fig. 15, in the shoe may be arranged to contact a bracket 95 on the brake drum when the lining has worn sufficiently, to give an audible warning.