Document wqp15R6MXBxR6M5JVj9mDyjoJ

FILE NAME Allied Signal Bendix ASB DATE 1934 Mar 6 DOC ASB117 DOCUMENT DESCRIPTION Patent - Brake Shoe Structure Patented Mar. 6 1934 800-631-6989 80-631-698 800-631-6989 800-631-6989 80 -631-6989 800-631-6989 800-631-6989 800-631-6989 PENGAD PENGAD PENGAD PENGAD PLAINTIFF'S EXHIBIT 751 1,950,262 UNITED STATES PATENT OFFICE 1,950,262 BRAKE SHOE STRUCTURE Raymond J. Norton Washington D. C. assignor to Bendix Brake Company South Bend Ind a corporation of Illinois Application November 13 1930 Serial No. 495,532 3 Claimas Cl 154 52 This invention relates to friction facings par- ticularly those of the type described in my co- pending application Serial No. 361,013 : internal The usual type of brake comprises either an g internal expanding shoe or an external contract- ing strap to which is attached a friction facing Since the advent and high development of the servo and duo servo types of brake the coefficient of friction of the friction facing has become of 10 paramount importance Due to the accelerated response and larger power multiplications of such types of brakes it has become desirable to choose friction material having a relatively low coef- . ficient of friction : , 28 The purpose of the present invention is to pro- vide a friction material which is adapted to be attached or molded to the shoe and which will having present a surface the desirable harden- ing properties and in addition a relatively low 20 coefficient of friction The invention broadly comprehends the idea of utilizing the present materials that is to say the materials now usually employed and by a suitable treatment to reduce the coefficient of 25 ; friction below that which would normally obtain For purposes of illustrating the invention in the drawing Figure 1 is perspective showing of a section of Uning having a section cut therefrom and a 80 Figure 2 is an enlargement of portion of the section of Figure 1 : More specifically the invention includes the provision of a friction material having a low co- efficient of friction which is preferably made up 36 by providing a permanently lubricated facing This may be done by treating suitable fibrous . ' material such as asbestos cellulose products etc. with a suitable lubricant and with the components of a synthetic resin Upon reaction of the 40 components of the resin in the manner well known to those skilled in the art an infusible substance may be produced which comprises o synthetic reain with which is permanently incor- porated & predetermined amount of a lubricant | scribed in copending application Serial No. 324,361 filed December 7 1928 of which the present application is a continuation in part As pointed out in that application the pre- ferred resin which employed is a condensation product of furfural and phenol This material is chosen because of its high reactivity and par- . ticularly the ease with which it may be molded in a metal matrix . ^sbestos In carrying out the invention ^sbestosor other fibrous products of low or negligible flammability may be treated by mixing the loose fibers with a powder comprising a solid oleaginous lubri- cant such for example as graphite soapstone talc or combination of such materials From 70 these fibrous products treated with the powdered lubricant a felted or woven strip of filler mate- rial is made up If desired such a strip may be made up from felted or woven asbestos alone in which case the powdered lubricant is added to the strip later either in a dry powdered form or carried by a suitable liquid vehicle that is subse- quently evaporated or otherwise removed | After the initial treatment of the filler mate- rial with the lubricating substance it may then be treated with a solution of a fusible resin in suitable vehicle or solvent This solution also contains a hardener As is known upon the ap- plication of sufficient heat and pressure to these potentially reactive substances a further reac- 85 tion ensues with the formation of an infusible p' roduct The fusible form of the resin may first be made up by reacting the proper amounts of furfural and phenol in the presence of a suitable cat- alyst such as hydrochloric acid As in the usual case of making up a fusible form of the resin the amount of furfural formaldehyd~ or equivalent substance which is employed is insufficient to form the Infusible resin These substances are then allowed to react under the proper therma conditions After the formation of the fusible form of the resin the water may be removed As shown in the drawing the lining 10 may be and the mass distilled with steams to remove the formed of & plurality of layers ci Abrous mat^'- excess of phenol cial 12 specially treated in accordance with the process or processes hereinsfter set forth in de- This fusible gum or resin may then be dissolved in a suitable solvent such as alcohol accione accione etc. 50 The operation may be carried out by treating relatively thin sheets of the fibrous material and then building up a number of these to form an integral laminated structure The friction material of the present invention 53 may be made up similarly to the manner de- To this solution of the resin there may then be added a suitable quantity of a hardening agent which will react with the fusible form of the resin to form the infusible product When fur- fural is employed the hardening agent may be an additional amount of furfural and ammonia or furfuramid In place of the furfural or its de- 105 110 ae 2 1,950,262- fusibleplarsetsiicn form accomplished rivative other hardeners such as hexamethyl- the synthetic gum in the These several layers may then be subjected to heat and enetetramin paraform etc. may be used in a mold to cause complete reaction While a furfural condensation product is given pressure as a typical and preferred form of invention it and the formation of the infusible product is to be understood that this is merely an example Other methods of combining the materials may 80 of form of infusible synthetic resin Instead be followed within the purview of my invention any of a furfural condensation product there may be Thus the powdered or comminuted lubricant may the fusible resin and such mix- employed the phenol formaldehyde condensation be mixed with or the acetylene condensation product ture applied to felted or woven strips of fibrous The potentially reactive composition which material and the resin subsequently converted 85 10 solution of the fusible gum with to an infusible form above described Or comprises a which is associated a suitable hardener is then woven or felted strips of asbestos may be treated . fusible resin then dusted with the pow- used as an impregnant for the pretreated fibrous with a filling material The impregnation of the fiber dered lubricant and the resin finally converted be carried out under any of the well known into an infusible form If desired the loose 00 may conditions After the desired im- fibrous materials may be mixed with the pow- accelerating pregnation of the fiber has been dered lubricant and to compose a cast into desired the material may then be placed in a mold and material that may be molded or heated to initiate and accelerate the final reac- shapes and later treated to convert the resin tion with the resultant formation of the hard into an infusible form 95 20 set infusible resin It will be understood that While there are described several specific em- the quantity of hardening agent employed and bodiments of the invention it is to be understood the temperature and pressure conditions of the that these are given merely by way of example treatment may be varied depending upon the for as pointed out the particular methods dis- degree of infusibility and hardness which is de- closed may be greatly modified the scope 100 - of the principles involved Hence it is not in- sired tended that the invention shall be limited to the It will be understood that the material com- ~ prising a fibrous filler a solid comminuted and descriptive matter set forth in the specificaion oleaginous lubricant and a dispersed con- except as such limitations are clearly imposed densation product may be molded directly on the by the appended claims 106 30 brake shoe as pointed out in the copending ap- I claim plication Serial No. 324,362 filled December 7 1. A friction facing comprising a plurality of 1928. Also if desired the facing may be made thin sheets of a fibrous material each treated up as a separate element and then attached to with a oleaginous lubricant and bonded with the shoe by any suitable means a resinoid ; 110 After the described treatment the resultant 2. A friction facing comprising a plurality of material product comprises apermanently lubricated res- thin sheets of a fibrous each treated in As already indicated this may be made up with a powdered lubricant to homogeneously dis- in the form of relatively thin strips If such is perse the lubricant through the sheets and per- the case these may be built up to the desired manently bonded with an infusible synthetic 115 40 predetermined thickness and then treated with additional quan- tities of the potentially reactive infusible form of the resin aplication of resin . 3. A friction facing comprising thin sheets of a fibrous substance each sheet having perma- Upon the application of heat and pressure the nently incorporated therewith : separate lami^-^may be permanently bonded to- amount of a oleaginous lubricant the lubri- 120 gether Also if desired the material may be cant treated sheets then being permanently made up initially of the desired thickness by im- bonded together with an infusible synthetic resin pregnating superimposed layers of the fiber with RAYMOND J. NORTON 50 180 55 60 140 05 145 70 TB March 6 1934 R. J. NORTON BRAKE SHOE STRUCTURE Filed Nov. 13 1930 1,950,262 INVENTOR RaymondRaymond J. McConker Smith BY ATTORNEYS