Патент USA US2131532код для вставки
SéPt- 27» 1938~- F. T. CHRISTIAN 2,131,532 VEHICLE BRAKE Filed April 16, 1937 FÉV ß .TH MFM! inks, . A ~ ¿Ulli/Less: /ÁiM?//oœ/Qfmßg/ / ' 9 - ' L? l v fan/c .7 BY I INVENTOR i Ma. _ TTORNEY.À 2,131,532. Patented Sept.'y 27, 1938 ~ UNiTEns'rA'rEs PATENT oFFicE VEHICLE BRAKE 'Frank T. christian,'E|mn-a, N. Y., assigner to Eclipse Machine Company, Elmira, >N. Y., a c_or poration of New York Application April 16, 1937, Serial No. 137,316 3 Claims. (ci. 18a-25o) ~ The present invention relates to vehicle brakes lugs lIii and I4 on the clutch operating members and more particularly to coaster brakes for bl cycles, velocipedes and the like. In that type of coaster brake which incorpo 5 rates an expansible -cylindrical brake member such as used in the device k'nown commercially as the “Morrow” brake,- constructed substantially in accordance with the disclosure in the patent to Morrow No. 906,149, patented December 8, 1908, 3 and 6 respectively. ` _ According to the present invention, the slots 6, _ and 9 ~terminate in triangular openings I5 and I6, the bases I1 and I6 of which triangles are ar- 5 ranged circumferentially'of the cylinder whereby strips or bands 'I9 and 2| of substantially uniform cross section are formed joiningv the segments into which the cylinder is divided by the slots 6 and 9. The bases I1, I8 of the triangular open- 10 I _ 10 a certain amount of difficulty has been encoun- - ings are merged smoothly into the sides thereof tered in connection with fracturing of the brake cylinder Adue to the cumulative effect of repeated by means of curved fillets 22, 23, 24 and 25, and the surfaces of thebases and fillets are smoothed ' expansion and contraction thereof. Extended and polished and their edges rounded to ensure ' investigation of this phenomenon has indicated 4that there are no sharp edges, scratches or pits 15 15 that such failures are .due to a fatigue of the ' which might form the starting point of a crack metal at points of localized stress, in conjunction or line of failure. t e ^ with the existence of minute superficial imperfec A hub member 26 having an interior cylindrical tions or scratches on the hardened surfaces of the brake. 20 - . It is, an object of the present invention to pro vide a novel expansible brake member which is efficient and reliable in operation over long periods of use. ~ It is- another object to provide such a device 25 which is so formed as to prevent localization of stresses. ' - surface of slightly greater diameter than the nor- A mal diameter of the brake member 1 is journalled 20 at one end on the anchor member 2 as indicated at'21, and at its other end on the driving member 4 as» indicated at ’29. A driving connection be tween the driving member 4 and hub 26 is pro vided- in the form of segmental clutch members 25 29 adapted to be. wedged into engagement withf' the interiorA of the hub by means of the adjacent tapered portions of lugs I4 on the nut >6. In the operation of the brake, backward rota It is a further object to provide such a deviîze which is so constructed as to avoid superficial formations conducive to the start of fractures or tion of the driving member 4 causes the brake 30 , 30 lines of failure. ~ actuating nut 6 to move to the left in Fig. l, thus A Further objects and advantages will be appar moving the brake assembly to the left until the ' , ent from the following description taken in con actuating member 3 enters into clutching engage nection with the accompanying drawing in ` ment with the anchor member 2. Further move which: ment of the nut 6 to the left- causes the wedges 35 35 Fig. 1 is a side elevation partly broken away I3 and. I4 of the members 3 and 6 to enter the and in section of a >coaster brake incorporating a flared portions II, I2 of .the slots 8, 9-` of._„the preferred embodiment of the invention; and brake sleeve, thus expanding the sleeve into fi'ic-v . Fig. 2 is a detail in perspective of an expansible tional engagement with the interior of the hub. brake cylinder >constructed ~in`accordance with During this expansive action 'of the brake cylin- 4,0 40 the invention. ' Referring ñrst to Fig. 1 of the drawing, there-~ is illustrated a coaster brake of the Morrow type including a fixed axle shaft l, a brake anchor member 2 threaded thereon, a brake supporting 45 and actuating member 3 loosely mounted on the axle and adapted to be moved into clutching en gagement with the anchor member, a driving member 4 journalled on the axle as indicated at 5 and having threaded thereon a brake actuating 50 nut 6. der 1, the iiexure ofthe connections-between the segments is distributed .substantially uni -forrnly along the, connecting strips I9, 2l by reason of their'subst‘antially uniform cross sec tion. There is thus no localization of stress, and 45 l the bending moments are well within the elastic limit of the material so that there is no danger of fatigui'ng lthe metal. The elimination of sharp corners, edges and all other'features con ducive to the starting of lines of failure also con- 50 A cylindrical brake member 1 rests at its ‘ tributes to the improved operation of the device. ends on the brake actuating members 3 and 6 and is provided with longitudinal slots 8 and 9 ex lIt has been found by exhaustive tests of this in comparison with the structure utiliz tending alternately from opposite `ends of 'the structure ing, circular openings at the ends of the slots as brake cylinder and having"` flared portions II and ‘ ß I2 adapted to be engaged by tapered expanding ‘ taught by the patent to Morrow above cited, that 515A _g2 I . 3,131,533> the utilization of the principles herein disclosed multiplies the average life of the device about twenty-five times, all other structural features tially circumferentially o! the cylinder and being Joined4 to the sides thereof by smoothly curved remaining entirely the same. Thus when the ‘ fillets, the surfaces of said bases and fillets being ' ~ average life of the earlier type sleeve was found rounded at the edges and polished. to be around five' thousand applications oi' the brake. `the average life of the same structure incorporating the features of the present inven tion was above one hundred twenty-five thousand such applications. > - ` ' ` 2.’ In a' vehicle brake, an expansible cylindrical brake vmember in the i'orm oi' a sleeve having longitudinal slots entering at one end and termin nating adjacent the other end in enlarged open ings formed to provide circumferentially extend ing strips of substantially uni/form cross section l0. joining >the segments of the cylinder. Although but one i'orm ot- the invention has been shown and described in detail, it will be 3. In a' vehicle brake, an expansible cylindrical understood that other embodiments are possible and that various changes might be made in the brake member in theform of a sleeve having proportions and. design of the parts without » longitudinal slots entering at one end and termi departing from the spirit of the invention as nating adjacent the other end in- enlarged open Vings formed to provide circumferentially extend defined in the claims appended hereto. ing'strips oi' substantially uniform cross section What is claimed is: >i. In a 'coasten brake, a cylindrical brake Joining the segments of. the cylinder, said strips 20 member having longitudinal slots extending being Joined to said segments by smoothly curved tlilets, the fillets and adjacent surfaces, of ,the 20 alternately from opposite ends, said slots termi nating in generally triangular openings, the strips being smoothed and polished. bases of said triangles being arranged substan ' FRANK T. CHRISTIAN.