US1611829A - Driving belt - Google Patents

Description

Dec. 21 1926. 1,611,829 A. L. FREEDLANDER DRIVING BELT 7 Filed June 14, 1922 2 h 1 I Jwvma To e Dec. 21 1926. 1,611,829 v A. L. FREEDLANDER DRIVING BELT Filed June 14. 1922 4 2 Sheets-Sheet 3 Patented Dec. 21, 1926.:

ABRAHAM L. FREEDLANDER, OF DAYTON, ASSIGNMENTS, 0F THREE-FOURTHS'TO PATENT OFFICE.

'OHIO, ASSIGNOR, BY DIRECT AND MESNE THE DAYTON RUBBER MANUFACTURING.

COMPANY, OF DAYTON, OHIO, A CORPORATION OF OHIO, AND ONE-FOURTH TO GENERAL MOTORS RESEARCH CORPORATION, OF DAYTON, OHIO, A CORPORA- TION OF DELAWARE.

pr Applicationfiled June 14,

This invention embraces an improved driving belt,'designed particularly as a fan belt for use in automobiles, and a method of manufacturing or producing such a belt.

That branch ofmy invention which is embodied in the article or belt'consists,;essentially, of a belt com rised of a plurality of circumferential mem ers-an inner or compression member, an intermediate or central member and an outer or tension member, each member being fabricated in this wise:

The compression member composed of soft vulcanized rubber mixed withcotton, wool or other fiber, the fibers preferably running crosswise, and fashioned into corrugations on the inner circumference.

The central member composed of rubberized cord fabric cut straight or parallel to thecords and in a pre-stretched condition, due to having been materially stretched before being combined with the other members.

The tension member composed of rubberized fabric cut on the bias or at an angle fi p si inner m will;

and in a pie-stretched condition, due also to ing combined with the other members.

This results in the completed belt being substantially non-stretchable. As these fabric elements are of different characteristics and as each has a difierent function to perform when embodied in the complete belt, the percentageor degree of stretch to which each is subjected will difier from the per centage 'or degree to which the others are subjected. 7

That branch of 'my invention which is embodied inthe method of producing this belt consists, essentially, in first fabricating the inner or compression member by mix.- ing with soft vulcanizable rubber, cotton, wool or other fiber, with the fibers positioned essentially crosswise of the sheet or. strip, and fashioning the inner circumference with corrugations; in fabricatin the intermediate or central member by ru berizing a sheet or strip of cord fabric, with the cords lengthwise of the sheet or strip; in. materially stretching such sheet or strip so that its stretchability, when it is embodied DRIVING- BELT.

1322. Serial No. 568,156.

in the completed belt, will have been largeless I'OllS by first winding this compression,

member on a, forming drum or structure; in then winding such central member on the already wound compression-member; in

winding such tension member on the already wound central member; and finally in. vulcanizing, as by steam heat, the resulting rolls of material so fabricated and wound one upon the other.

The result of my invention in its two as pects is a driving belt which is substantially non-stretchable circumferentially; which, because of the construction referred to, notably the corrugated combined rubber and more readil bend and conform to and grip having been materially stretched before bethe formation Ofthe p l y on Which the belt is used, and enable the sides of the belt to more perfectly bind against the walls of the belt-grooves formed in the pulleys, and which will not lose such elfects'by any material subsequent. stretching, and yet will be firm and nearly rigid transversely.

In a, the accompan ing drawings forming a part of this speci cation:

lEig. 1 is a diagrammatic view of a ten sion and winding apparatus used in carryingout my method; 1

Fig. 2 is a diagrammatic view of a press for forming the projections and spaces of the compression .member of the belt;

' Fig. 3 is a detail enlarged view of a 'portion of the compression member showing such projections and spaces; v

Fig. lis a cross sectional view of the belt;

Fig. 5 is a view of a piece of fabric cut on the bias;

Fig. 6 is a like View of a piece of mixed vulcanized rubber and canvas fiber, utilized in formin the inner or compression member of the belt;

' plete.

, on-the compression member, the winding I 'ratus employed for winding and tensiomng l Fig. 7 is a perspective view-of the winding drum and the'toothed spool thereon with a roll of beltin on the latter; Fig. 8 is a view of the winding a roll of belting thereen; and

Fig. 9 is a side elevation of the .belt con spool and 'I ill-first describe my method because it results in the production of the belt. In this way my invention will be more readily understood. 7 1

Referring first to the apparatus I prefer to employ in carrying-out the stretching and winding steps of my method, the nu'merall v designates a roll upon which is wound, first, a quantity of material which is to comprise the compression member, and when thls is consumed then a quantity of the material which is to comprise the central member, and when this in turn is consumed, then a quantity of ,the material which is to comprise th tensionmember. Or there may he, say, thr e rolls, such as 1, each roll carrying a quantity of the respective materials and each roll in turn mounted in the machine.

' As shown in Fig. 1, the material ltto' constitute the compression member has already been wound on the spool carried by the drum, and the material 2 constituting the central member is'inthe act of being wound being nearly complete, as usually three layers are sufficient. Later in the process the material 2?, comprising the tension member will bewound'on the central member.

As illustrating the operation of the appathe materials itwill be seen that the material comprising the central 'member, generally des1gnat-ed-2, passes overa guide roller 3, a flattening platform 4, another guide roller 5 and a tension'roiler 6. The shaft 7 of thisllatter roller is put under different degrees of friction through a screw 8 and its friction block 9, to cause the roller 6 to revolve with more or less resistance. In this way the required tension for the/central and tension members is put upon the material as 7 it undergoes the winding step.

-A drum 10 having a gear -wheel '11 is mounted on a shaft 12 and rotated by an idler gear 13 driven b a driving gear Men the shaft 15 of an ,ectric orother motor generally indicated at 16; On this drum is fitteda removable corrugated spoell'i. The mate'rialsare wound directly on this spool which is carried by the drum, the".- spool 'beingremovable with them as a whole, the corrugations of the spool receive the proa cylinder 19 1 ntowhicl1'steam is introduced,

of .the belt is to be composed. This mner surface is laid upon the corrugated forming plate 25 and when the plate is elevated until this compression member contacts withthe stationary head 26, the teeth of the formmg plate imbed themselves into the soft rubber and form projections and spaces constituting the corrugations on this belt member. See Figs. 2 and 3 of the drawings, the

latter showing. the result of this treatment, in which condition the compression member is subsequently mounted on the roller land fed to and rolled upon the corrugated spool of the drum, the teeth on the spool corresponding in size and position to the spaces and projections which form the corrugations on the belt member.

A @ife which is utilized cutting the roll of belting into the in ividual belts forms another invention inde endent of this one and is the subject of an application'for a patent-filed by Amos Puterbaugh June 19, 1922, Serial No. 569310. 1

It will now be seen that when the motor is putinmotion the several gears will rotate the drum with its spool, so that the different compression member is fabricatedby 'miiring soft vulcanizable rubber with fiber, preferably of cotton or wool. This mixing-of-the rubber and fiber is preferably performed by a rubber mixing mill-a pair of rolls, one of which travels faster than the other. The

body of rubber so mixed with the fiber is runthrough .a calender machine" which formsit into a sheet in which the fibers are found to tend to position themselves lengthwise of the strip. After the sheet is formed it is cut 011' in strips crosswise of the sheet so that the fibers will stand crosswise of the strip. The effect of running the rubber through such calender machine is to deprive it of any real stretchability lengthwise,- but leave it unaffected crosswise. Therefore, the jections and enter the-spaces formed by the strips are cut crosswise of the sheet and this corrugations on the inner surface of the material of which the compression member llO lateral stretchability in the sheet becomes longitudinal stretchability in the strips. A

canvas strip 1 is preferably also laid over 'the rubber on'the inner surfaces so as to cover the corrugations. j

a. finished and homogeneous "structure.

The central member 2 is fabricated by taking a sheet or strip of cord fabric and rubberizing it in the well known way of rubberizin fabric. The strips are cut so that the cords run lengthwise the strip,

sometimes calleda straight or parallel cut. The fabrication of the tension member 2 is done by rubberizing a sheet of fabr1c cut on the bias, see Fig. 5, at say an angle of 45 essential stretchability of the cord fabric having been taken outby the stretching-operation which precedes, the actual winding.

The characteristic of thetension member is also'strength and substantial non-stretch-,

ability due to the fabric having been pre stretched.

It will now be seen "that my method consists in fabricating, substantially in the manner. above described, the material for the inner or compression member, wlth its corrugations and quality of yieldability; in fab "ricating' the material for the central member, likewise in the way above pointed out,

- withits practically. non-stretchable quality;

in fabricating the material for. the tension member, also in the manner pointed out, with its quality of practical non-stretchability, so that these two members will resist the tension they are ut under in use; in sub-. jecting these respective materials of the central and tension members to a tensioning or stretching operation and in'.winding the three elements, successively, on the drum,

' first winding the material-of the compression member, and properly uniting the ends of enough material to girth the spool;- in

then tensioning and winding the material composing the central member with as many laps as desired, saythree, which is preferable; and finall in tensioning and winding the material 0 the tension member again with as many three. y

When the belt has been thus formed and built up it is in'the form of a roll of belting material, as best seen-in Fig. 8. In this state it is vulcanized by the usual vulcanizing process employed in the manufacture of pneumatic rubber tires. The elfect of the vulcanizationis to cause the several members, and the. laps of material composing them, all to run together or unite to make laps as desired, preferably 1 strument; 1n wind ng the second on the first; I

Referring now to the belt that results from this method, attention is called to Figs. 4 and 9 whelethe same is illustrated in its complete condition, having been cut or sevcred from the roll of belting on the spool.

This belt so made has the compression memher, the central member and the, tension member, characterized by the facttthat the compression member has corrugations and is highly yieldable in respect to the rubber ingredient, whileboth thecentral and tension members. are practically or substantially non-stretchable.

Having thus'ful-ly described my invention; what I claim as new and desire to secure by Letters Patent, is

- 1. The herein described method of makingan endless roll of driving belt, material from which individual belts'are to be cut, conslsting in fabricating material for the comprcssion member including corrugating the e inner surface; in fabricating other material for the central member; in fabricating still other material for the tension member; in

re-stretching the central ,and tension mem- Jers; in Winding on a suitable instrument the material of the compression member; in

winding on the latter thematerial for the" central member; in 'windingjon the latter the material for'the tension member; and in 1 vulcanizing the roll thus built up. I

2. The herein describedmethod of mak ing an endless roll'of driving Ibelt material from which individual belts are to be cut, consisting in fabricating the compression member of soft vulcanizable rubber mixed with fiber, including corrugating the inner surface; in fabricating the \central member,

of rubberized cord fabric; in fabricating the tension member c on the t; in winding thethird pnthe secrubberized fabric; in w1nd 1ng the first of these materials on a rotatmgjijstrument; in winding'the second 0nd; and in vulcanizing the roll so built up. I

3. The herein described methodof. making an endless roll of drivingbelt material from -J which individual belts are to be cut, consisting in fabricating the compression member of soft vulcanizable rubber mixed with fiber, including corrugating the inner surface; in

fabricating the central member of rubberized cord fabric; in fabricating the tension member of rubberized fabric; in winding thev first of these'materials on a rotating in- 4. The herein described method of making an endless roll of driving belt material from which individual belts are .to be cut, consisting of fabricating the compression member of soft rubber and fiber, including corru- 4 gating the innersurface; in fabricating the central member of rubberized cord fabric; in fabricating the tension member of rubberized fabriocut on the bias; in taking the material for the central and tension memthereon that of the central member; and

hers and subjecting them to a stretching op-.

oration and winding operation simultaneousl v conducted;-in firstiwinding the material of the compression member; in Wind ng finallyv winding on the latter the tension member; and in vulcanizing the composite belt roll thus formed.-

5. The herein described method ofmaking aroll of driving belt material, consisting of a compressible member formed of rubberand fiber with corrugations on the in nor surface; of a central member composed of rubberized cord fabric out parallel; and

a tension member of rubberized fabric cut on the bias; in firstapplying on a winding instrumentaht the material of the compression mem er, then the material of the 1 central member on the compression member,

and then the material of the tension memher on the central member; in pre-stretching' the material of the central and tension members; and in vulcanizing the Whole to form a complete roll of belting.

6. The herein described method of making an endless roll of driving belt material from which individual belts are to be out, consisting in fabricating the compression member, including corrugating the inner surface;

in fabricating othermaterial'for the central member; in fabricating still other mate-' rial for the tension member; in Winding on a suitable instrument the materialof the compression member; in winding on the lattcrthe material'of the central member; in v ture.

ABRAHAM L. FREEIjLANDERQ signa

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