US2608874A

US2608874A - Belt

Info

Publication number: US2608874A
Application number: US95234A
Authority: US
Inventors: Dale L Waugh
Original assignee: Dayton Rubber Co
Current assignee: Dayton Rubber Co
Priority date: 1949-05-25
Filing date: 1949-05-25
Publication date: 1952-09-02
Anticipated expiration: 1969-09-02

Description

D. L. WAUGH Sept. 2, 1952 BELT Filed May 25, 1949 A mw mlm V Nu 1A D HIS ATTORNEY 'Patented Sept. 2, 1952 einem r v v, e, v zoaszi nalen fwagngnayton, ohio; 'assigner 'tu-The i Dayt'oufRubbr Company, 'a ,eorlioration of Aiipiietifefi 27551949, 'serial-Nd. 95,2734 f The present `invention*relataeslt "Lbelt', falli" more, Particularly t9 Ail type `.ilfzltz,liawirieiteeth. formed'in the oompressionjseetign :and composed of a blurality of fabric layerskjj 'l d v Belts of this type which are-particularly adapt- 5 ed dforwuse in driving generators, blowers V"o1" Otlifiqpmnt Dnirei'lreladtar's are irequently of the oonetorjtypejrather,than endless vas in theaseforjbeltsiforiheriapplications: It has beefi9i1nd'-ibat,inporder .fQrthe' onnctor's t0 befirml lanhbrdinthe'beltginamannerwhich, Willwthstandiionepredsouee;it is. necessary that tliesfe lbieltsbe 'composedi subsftantially'' enf"A j tirly jot-alternate? layersiof rubberized fabric.V Prfeab'lyfthe' ibeltis iilrqvided Lwith ,a Squefef .15 woven, istaiehtlaidurubberized fabric Compresf siorr section; v'a bias-'laidl fabri intermediate see- 7 claims.' @(01. '14;23'33ji f Referring to thefdraWingsF-ig. 1 is a -p'ersp' maybe'in the formof'con'tinuou's or stapl'enl'a'. ments; The fabric Vmay 'preferably weigh beS-J tween"5ozs;' and 17 ozls. persQuaIyard; andfir'if generaLan oz. fabric is satis'fac'ztoiy. Theeint,

for endsgberinchnaybe that'whiehisconsidered' ff `the various types'of rayon, 'will notQb'eoperativie to perform theV desired'v function in th'biassec' tionand that nylon is the-only' textile'matrial which apblicanthasv found to` unotfsatis factoril'y in 'this respect.-V`

tive i'fie'w which lis partially-in cross seetionft'o "fdeseribe'the y,belt 'constructioni Fig. 2 is altrans` f verse oros's'setion along lines 2;2l of Figli. 3 illustrates 'in vcross Section abeltrsirnilarto that-" Y y Y H t0 breek bycraeking under Severe flexing; in theiprwsence' of. duet," ertraimisnjow: heat and colm'whiphgitansubieremhuein-usef Y,

Applieenthasinowidisssverd; inpacwfdene Wtfr' the'presentj -nyentionthat by d making allA 40 or ap'rt'ionof Ithe biasf'se'rtio'n of square-'Woveii`r nyln-fdabricfwhih isib'iasf laid',V that `the appearance'and'groWth of thse betyenthe tooth 'cracks can" -be eliminatedor vzrialteri'allyA `retarded Athus J substantially'increasing tl'ie'liieof the belty The Y 45 nylo'fabrio'mayibefof 100% nylon orniayfbe .made of va blend of nylon and vcotton inf which thenylo'n in the lullen' not less than 25% TheA pression section.r is the'bias' section whichcoil-f"1 sistsy o'fd-ifabic layers II and |21' Layesfllare" ferred4 to iirlfiieh are Squarefwove'ri and biaslaid'.- TheA number offnylonf plies may be i/"aredtpISuii-,jw thefparticular"A requirements` and generallyfwill be from 'oneft'o six plies. v:Layers I'2n consist oiiif` plurality' of layers of bias' cotton fabric; fAs illusl'- trate'di'the'bias section' actually 'consistso'f two?! portion'sj the 4hinge section' II n comprising', :for-fifi examblg-the layers of rubberized nylon bia'sl'fabri Tf' and "anljlint'rr'nediate' section superposed" there" 'Y' on V`'ornprising'layersfof bias-'laid' cottonffabifi lj- If desired, the entirebias is'eetionl designatedibyg". I I and`l2fmay befoomposed of layers of thenylonfffv` material butfgenerally' it iswsatisfactoryit onlythe lower vportion of 'the' plies thisseetiom Jorl f ,thosa'djaoent to `the 'compression' secti'oril are composed' of ylon Mounted -u'po thetbias'section I2 i's the'tension section I3 Whichi's com21.vr posed "of-"a `plurality loflayrs of square'-Wovem straight-laid; rubb'eri'zedt'ncott'oni fabric. A yf Y shaped rdubb'eri "impregnated ,bias "fabric'` layen 1 I 1 g embraesthesides andtheb'ottomof the bel Superimposed'is al'cove'r layer' ofrubberized biasg;l fabric" I which extends" around the vfoui':v sides;` ',oi' the "beltv overlappingglat'thetop; Teeth. Ii,.ar. efll- An additional layer of bias fabric l1 is applied to the bottom of the belt and inside the teeth to cover the cut out portions.

Fig. 3 illustrates in cross section a modification of the construction illustrated in Figs. 1 and 2 in which a single row of rayon or nylon cord I8 replaces one of the layers of cotton fabric in the tensionsection. It has been found thatordinary cord reinforcements in the tensionsection of this type of belt are unsatisfactory since they require the replacement of a plurality of layers of square-Woven fabric. This deprives the belt of the requisite strength for proper anchoring of machine.

condition are then frozen by means of dry ice the belt fasteners. In this particular type of belt in conjunction with the use of nylon fabric in the base section, it has been found that increased longitudinal strength may be imparted to the Abelt Without depriving it of the necessary strength for anchoring belt fasteners by replacing one of the fabric plies in the tension section with a row of 4 These cores may be cut either as continuous rings by means of parallel knife cuts or may be cut in long strips by moving a knife horizontally across the drum to cut a long spiral core from the drum. The cores are then covered with cement and wrapped. In the form shown the core has two covers, the inside of which is applied in U shape and the outer cover applied Aentirely around the belt witha lapfat the top. Th'ecovers are applied mechanically by means of a covering The covered belts still in an uncured while in a stretched condition and are then removed and teeth punched from the compression section while in a frozen condition. The punched belts are then thawed. At this point the belts are cemented between the teeth and a bias strip rayon or nylon cord having the proper dimenp sions.1 Other` materials are not suitable for this purpose. The diameter of the cord used should not exceed the thickness of the space between fabric plies created by the elimination of a single ply of fabric.` In general the diameter of the cord used will range between 0.030 in. and 0.080 in. The cords may bespaced in the row or may be contiguous.

In the manufacture of this belt a building drum is selected having the desired diameter. Layers of square-Woven rubberized fabric forming the compression section are then Wound concentrically upon one another around the drum by rotating the drum. The compression section may be composed, for example, of rubberized cotton duck Ywhich is frictioned and skimmed with a layer yof vulcanizable rubber composition. Of course, each layer will have the desired gauge depending upon the final size of the desired belt.

'I'he desired number of layers of square-woven nylon fabric which are frictioned and skim coated with rubber compound are then wound around the compression section. The desired number of layers of bias fabric necessary to make the bias section are then superimposed upon the nylon layers. Thereafter, the tension section is applied. This fabric may be the same as that of which the-compression section is composed and is applied in the necessary number of layers.

'I'he rubber compositions which may be used will include the natural and synthetic rubber materials Well known to the art, including the conjugated diolen polymers and copolymers with styrene or acrylic nitrile, such as the buna rubbers, the polychloroprene polymers, such as neoprene, and other Vulcanizable resilient elasticV rubber-like materials commonly classified as synthetic rubbers. Of course, these compositions contain Vulcanizing agents, accelerators, fillers, etc. as well known to the prior art. One type of belt commonly constructed contains 11 plies of fabric in the compression section, 3 plies of nylon and 2 plies of cotton fabric in the bias section, and '7 plies of cotton fabric in the tension section; These layers are skim coated with natural rubber compositions before application to the drum. Where a cord layer is used-as shown in Fig. 3, the winding of fabric in the tension sectionis carried out in two steps with a layer of rayon cord being wound at or near the neutral axisfof the'belt. At this point, the` various layers which form the core of the belt have been applied and the individual belt cores are cut from the drum in the manner known to the art.

laidY over the tooth profile. The belts are then cured in long molds in accordance with the practice known to the art. After curing any overiiow4 stock is trimmedand the belts are cut into therequired lengths.

The same type of construction may be utilized such f in the manufacture of endless belts where construction is desired.

I claim:

l. In a belt, a compression section consisting essentially of a plurality of rubberized fabric A layers, teeth formed in said compression section, an intermediate section consisting essentially of a plurality of layers of rubberized fabric comprising at least one layer of bias-laid fabric vhaving. at least 25% of nylon in the yarn from which the fabric is woven positioned adjacent the compression section and over the toothed portions there-l` d of to serve as a hinge section between the teeth,"

and a tension section comprising a pluralityof layers of rubberized fabric.

2. In a belt according to' claim 1 wherein the tension section includes a layer of rayon cord positioned at an intermediate point therein'between layers of rubberized fabric.

3. In a belt having superposed compression, l

intermediate, and tension sections,` and havingy teeth formed in said compression section; where-y in said intermediate section comprises a, plurality of layers of bias-laid square-woven rubberized fabric at least one of which layers is composed of fabric-having at least 25% of nylon inthe yarn from which the fabric is woven and being posi'- tioned adjacent the compression section.

4. A V type power belt fof the connector type I having a compression section consisting of a plurality of layers of square-woven.- straight-laid rubberized cotton fabric, a, hinge section consisting of at least one layer of bias-laid square'- V woven rubberized fabric containing. at least 25% of nylon in the yarn from which the fabric is c woven superposed upon and adjacent to said compression section, an intermediate section consisting of a plurality of layers of rubberized, squarewoven, bias-laid cotton fabric, a tension section comprising a, plurality of layers of rubberized, square-woven straight-laid cotton fabric, Ateeth formed in said compression section, and an enclosing cover of rubberized fabric surrounding said sections.

5. A belt according to claim 4 wherein the hinge section consists of a plurality of layers of I bias-laid square-woven rubberized nylon fabric. `6. A belt according to claim 4 wherein the tension section comprises a layer of nylon cords positioned at an intermediate point therein between f layers of rubberized squarewoven straight-laid 'cotton fabric.

.5. 7. A belt according to claim 4 wherein the tension section comprises a layer of rayon cords positioned at an intermediate point therein between layers of rubberized square-woven straight-laid cotton fabric.

DALE L. WAUGH.

REFERENCES CITED The following references are. of record in the le of this patent:

UNITED STATES PATENTS Number Name Date Freedlander Dec. 22, 1936 Carothers Feb. 20, 1940 Hoff Feb. 17, 1942 Crosby Nov. 12, 1946 Kuhn Dec. 9, 1947 Hunter Apr. 12, 1949