US1863738A - Spring pad - Google Patents

Description

A. H. ADAMS June 21, 1932.

SPRING PAD Original Filed Oct. 20, 1928 .VIV

Patented .irme 21,1932

unirse stares PATENT oFFics .ARTHUR H. ADAIVIS. OFVYONKERS, NEW YORK, ASSIGNORTO TROYLAUNDRY MACHIN-v ERY COIVIPANY, TNC., GE NEW' YORK, N. YWA CORPORATION OF DELAWARE' SPRING' ran' Original application led October 20, 1928, Serial No. 318,858. Divided andthis applicationled OctoberV i, 1929. Serial No. 396,591. Y Y

This applic-ation is a division of mv co-k pending application lio. 8l3,858, filed (loto-v ber 20, 1928. Y

This invention relates to springs and also 5 to methods and apparatus for winding convoluted springs. More particulariy, the invention is concerned with springs of the type having inclined convolutions.

The invention is in the nature of an iinthe copendingapplications of Arthur H. Adams, Serial No. 245,180 and has for one of its objects to produce a closely wound skewed spring which has a maximum of resiliency in a direction perpendicular to the axis of the spring convoiutions.

As described in said applications, the char-- acteristics of skewed springs render them particularly advantageous in providing a resilient surface which is capable of localized compression without permanent deformation, such surfaces, for example, being employed in vlaundry machines, paper machines and the like. Accordingly, another object of the invention is to produce aV resilient padding of the tv e disclosed in application Serial No.'

.. p l .L

245.180 in which the resilient element consists l 7 u of a skewed convoluted spring which has a maximum of transverse resiliency for a given size of spring convolution. l

A further feature is to provide a resiliently padded roll or thelile. employing as a resilient element thereof skewedsnrings having square or rectangular shaped convolutions.

Another feature pertains to the means for uniting the free ends of a coiled spring which is wrapped around a roll or other equivalent surface.

As is well known, laundry rolls, etc. are provided with one or morer outer coverings of woven fabric with one end fastened to the roll and the otherend free. Tn the case of rolls having a resilient padding formed of coiled springs wrapped around the roll such as disclosed in application Serial No. 245,180, it is important that the covering be fastened so that during the rotation the winding effect on the covering will not produce ridges in the spring padding. Accordingly a stili further feature pertains to the novelV method and provenient upon the invention disciosed iiiV ineans 'for anchoring the roll covering or` For the purpose of illustrating one pre- Y ferred manner of using a spring according to the invention the same willibedisclosed? as applied to va laundry ironing roll, butit fill beV understood that this is merely forthe:

purpose of illustration and that its appli'ca-` bility for analogous uses inl other ieldsis Within the scope of the invention.v

Referring to the drawing, Fig. l showsin'V schematic form the successive ste-ps to befollowed in winding a square o'r rectangular convoluted and nestedspring accordingto the' invention.

Fig. 2 is a top plan View of the spring as it is formed according to the method illus-.v trated in Fig. l.

Fig. 3 is a top view of the spring, looking inthe direction of the planesV of the convo-v lutions, and showing the alternate short and long loop structure of the top surface of a spring of this construction.

Fig. L is a bottom plan view ,ofl the spring,

looking inthe direction of the planes of the convolutions, and showingv the staggered equalloo'p structure of the bottom surface. of a spring of this construction. Y

Fig. 5 isa side elevation of av portion of a CTD spring,according to the invention, with the i .preferredA manner of lockingl the spring agaiifistV creeping over the roll surface.

Fig. 9 illustrates ya preferred manner of iii-fu fabric covering to the Fig. -12 isa simplified diagram showing the method of attaching a plurality of separate layers of fabric coverings at diametrically .opposite ,points `using the .anchoring means of Fig. 9. i

Referring particularly to Fig. l, thereis diagnammatically shownraa "method of lforming Lan inclined square-*or rectangular spring kwith successive convolutions Vof .different sizessotliat each small lconvolution may nest Withintheizadj acentlarge convolutioiis.Y The nesting-.eifectr'enables the convolutions to be closer together :than-has Vheretofore been found Vpossible'. and @without -curtailing the resiliency when the convolutions are-subjected `"to .pressure .in `a directiontransverse to theirV common naxis. This feature kis important Awhensufchsfa spring acts asfazresilient supporting surface such-.las is used inilaundry rollsortlie like since it provides a non-ab` sorbent fresilient supporty forY the fabric cover. ing :and also presents a'substantially con# tinuous supportltlierefor. .Asfshownrin Fig. 1, a Vlength :of .spring fWire ofxthe requisite crosssection .and preferably: ofk non-corrosive material f such 'as' phosphor-bronze, lor the. like,

Vis subdivided into 'eight-smaller lengths-.and

each length is bent substantially .ratlright angles with respectI to .the ilpreceding :.length.

- In -'the tease ao'f a square :spring .the lengths l, 2'and 5 are equal, while lengths and 8 are ishorter, preferably uanwamount correspondingltofthethickness of the spring'wire. Lengths 1,22, I3' ian'd 4 `are` their bent so i that they noi-mallylieiatright angles with'oachV other, thus forming a .rectangular convoluf tion'andithepurpose of making tlielengt-h l shorterfthfanlength. 3 is to givethe convolu- A tions-ofthe completed .spring4 an inclination as' described in application Serial No.l 284,722.`

The succeedingconvolution comprises lthe Vlengths 5,56, Trand'S.;.Asiwillbeseem length 6 :is shorter than -the -.corresponding length 2 of thelargerconvolution, 'sothattlie con- Y 55 volutions, V6,7,\8'may, whenthe spring is in use, enter or nest within the convolutions l,2,f3,efl. yThe length 7,.it VWillfbe understood, is the same as the corresponding length 3 of tlie i large fconvolution. 1 fHowever, during the transverse compression ofthe spring-the length V'7 is "inclined sufficiently Ato Aenable length Gto t' belen7 thecorre'sponding.length 2foff the convolutioiis l,2,8, 4. The'foregoingv described cycle vofibending at :predeterminedVV lengths'isrepeated throughoutthefiest of the springfwire, resiiltnrgsnr a structure, as shown in Fig. 2, in which the successive convolu-V tions are adjacent to each other but are progressively displaced along a common axis represented by the dot dash line 2-2. Fig. 2-represents `a top plan'view of the `.spring asit is formed. Fig- 3 is atop view-of the.

spring looliing in the direction of the plane i of the convolutions and showing the alternateshort andflong loopstructure ofthe-top surface. Fig. 4 is a bottomplan view of the spring looking in the direction of the plane ofthe convolutions showing the staggered equal loop structure of the bottom surface.

-In-orcler to use thev spring 'shown in Figs. 2, 3 and l as a resilient supporting element,

such, for example, as employed iii-laundry rolls,the springvis stretchedfuntil the-turns thereof assume the desired spacin-gyfor'example, as shown in Figs. 5, G 1and 7. -VhenA Y the spring of Fig. ,2 is thusstretched, in -side elevation, all the convolutions.appearitobe of the sa1nelieiglit,fas shown in Fig. 5. Howevcr, when such a spring isflocally compressed in the direction of the. arrow the -smallfconvolutions are Y distorted land the :upper ends lit. within the leftLhandadj-acent large con` volutions. considered in connection with F ig.6, which shows a -top plan view ofthe spring of .Fig. 5. As shown in this Iigure,7tli`e'lengtheof each small convolution 'is such' that Ewhen the spring is compressed itwillfreely enter v,below the corresponding length 2.oftlielefthand adjacent large convolution. VvFig. 17 fillustrates the `relation between `the bottom lengths-of successive large andsmall convolutions. From a considerationfof Figs. I);

This action will be clearer vwhen p 6 and 7, it will beseenthat-inlthee'normal position ofV the spring the height of ,-all .the

'convolutions is substantially the samefandfin this respect the spring is similar @tothe in-` clined spring shown in application oSerial No. 284,7 22. It is'fto'be noted however, that the. transverse resiliency of` the spring. inithis latter application is limited bythe .faetthat during transverse compression each Aconvolu- ReferringtoV Fig. 8, thespringeofFigs; 5,

6 and'7 isshoivn as applied-toa roll periph-` erysuch asu-sedwin laundry machines. The` roll proper comprises .ai base plate, 9 -whichi is VIn this respect the roll of Fig. 8 is similar to that disclosed in application Serial No. 245,180 referred to hereinabove. However, in the present embodiment, it is preferred to compose the resilient surface of a plurality of separate springs Wrapped around the ei;-` terior of the base 9 instead of providing a single helically wrapped spring. In addition, in order to prevent creep of the springs over the base 9 as the rollis rotatedtabs l1 are suitably struck up from said base to provide slightly hooked prongs for engaging the lower lengths of the spring convolutions. The number of these tabs may be determined in accordance with the size of the spring and the maximum working pressure to be exerted on the roll. l

As shown in Fig. 8, the spring supports a. series of fabric coverings comprising aii inner covering of duck or canvas l2 which is given substantially two complete turns around the springs periphery, and overlapping tlie last half turn of the canvas is a layer of wool material 13. 0n top of this latter layer is the usual outer layer of muslin. lf the duck covering 12 is fastened to the outer surface of the spring padding or if it is fastened to the roll 9 by tapes, strips or the like, as the duck is wrapped tighter and tighter by revolving against the heated ironing chest, a portion of the padding in the neighborhood of the fastening means will be locally compressed. This local compression will appear as a longitudinal depression in the surface of the roll and will niark the goods being ironed. For the purpose of properly anchoring the fabric covering to the roll so that the inward radial component of the pull resulting from the continual winding effect may not be transmitted to the springs, the inner end of the canvas covering 13, is fastened as shown in Fig.` 9, by means of eyelets 14 which are coupled to corre` sponding eyelets formed in looped spring members l5. As shown clearly iii Figs. 9 and l0, the forward end of each member l5 is offset and registers with a corresponding narrow embossed or raised portion 16 in the surface of base 9, while the backward end of the member l5 is slightly curved and rest-s upon the outer surface of the base 9. Thus the fabric coverings may be held against the spring covering without the use of perinanent iastenings to either the springsor the base plate since the members l5 are readily y placed. in position without the use of. bolts for other fastening means. With this manner of fastening, as the roll rotates, there is atendency :to increase the tightness of the fabric coverings. However, since thevcovering is in effect resiliently attached to the base 9 the compression due to this-winding effectis not transmitted to the si rings, as would be the case if the fabric coverings were attached directly thereto. r

Any manner of uniting the free ends of the spring padding may be employed. However, it ispreferred to employ a cap union such as illustrated in'Fig. l0 wherein opposite ends' of each spring on being wrapped around the roll are rigidly clainpedtogether by means ofa metal cap l?, which has its edges pinched together as shown in F'ig. ll.

Referring to l2 there is shown'a novel method of attaching series of fabric coverings whereby the winding'eifect'on. the

coverings is relieved during substantially zie-.half of each revolution 'of the roll. As shown in Fig. l2 the roll 9 is provided with duck or canvas covering for the spring padding which is preferably the saine type of padding as disclosed in Figs. 8 and 9. 'For the purpose of siinpli-fyingthe drawing, however,`the spring padding is omitted from Fig. l2.y nstead of providing a singlel length of duckv covering which is given two turns around the roll as described in connection with Fig. 8, the duck covering is divided into two lengths La and 12b each of which goes around the roll once, and fastened atdiainetrically opposite points to the roll by means of elements l5 as described hereinabove. A heated ironing chest C is shown in cooperative relation with a portion of the rollsurface. By means o-f the two part covernigas shown in Fig. 12, the greater portion of the spring from the point where it isfastened tov mem` ber 15 to the far edge of the chest C. `However, when the free end of wrapper 122L leaves the chest, the said wrapper can slacken and also the last quarter turn of wrapper l2". Thus the progressive and increasing tightening which occurswhen a single length'of duck is employed, is avoided.

What I claim is: Y l. In combination, aA base plate, a spring padding mounted on said base plate, a fabric covering for saidpadding, and means for attaching said coveringrto said base plate, comprising a springniember attachedfat one end to said base plate'and extending outwardly to apoint ofattachment with said covering substantially in circumferential alignment with the periphery of 'said padding.

*2. In combination, a base v iplate, a spring padding mountedv vonsaid base plate, a fabric covering for `said padding, 1 and` means Afor attaching said covering tosaid base plate, comprisinga'spring member attached at one end to said base-plate and extending outwardlythrough said spring padding to a point of attachment with said 'coverine substantially in circumferential alignment with the periphery of saidpadding.A Y

3. In combinatioma cylindrical base plate,

resilient-1padding mounted circuniferentially on said base plate, a fabric covering Wrapped about said padding and disposed Whollyupon the exterior thereof, and means for securing the inner end of said covering to said'base plate, saidmeaiis being resilient to enable `A its point ofattachment with said covering to folloW any local distortion of said padding.

4. In combination, a cylindrical base plate, resilient padding mounted circumferentially on said base plate, a fabric covering WrappedV about saidpadding, andineans for securing the inner end of said covering to said base plate, said means being resilient toenable its point of attachment With said covering to fol- Y W any loc-al distortion of said padding.

base plate and an inner end of said covering for resiliently anchoring said covering t0 said base plate. Y

.7. In combination, a cylindrical base plate, plate, a fabric covering for saidplate, means for resiliently supporting said covering in spaced relation to saidplate, and anangularly bent spring fastener interposedV between said. base-plate and said covering and having one leg secured to said ybase plate, another leg movablysupported Vuponthe surface of said plate and secured tosaid covering at the point Wheresaidlegs meet.

8. In a laundry ironing rnll, the combina-Y tion of a cylindrical base plate, a resilient padding mounted on said baseplate, a Afabric covering for said padding, and means forA anchoring said covering to said plate, including a plurality of resilient stripseach having one end attached to the base plate and the other Yend `thereof attached vto* an end of thev said covering in preventing the progressive wrapping tighter of the fabric coveringfincluding a first llength of fabric resi'liently `anchoredat its inner end in Lspaced rel-ation Vto said rollganother length of fabricfresiliently anchored lat its inner end in spacedrelationto the roll ata. i

point circumferentially spaced from the anchoring pointfor the irstilength, said pieces of fabric being of lsuliieient length to over-v lapV and provide a double ,thickness covering throughout the periphery of saidroll.V

10. In a laundryironing roll the combination ofl va cylindrical base, a resilientpadding mounted on said base, a length of fabric covering Wrapped around said'padding and resiliently anchored atitsinner end .to said plate, another Ylength -of fabric 'having zits iniier'end resilently attached'to said basefat apoint opposite to the lanchoring-point of the lirst length. v-

ll. In a laundry roll, the combination of a cylindrical base, a resilient padding mounted on said base, a plurality. Vof lengths of fabric covering for saidpadding, resilient means for anchoring said lengths to `,saidA plate at o1 posits sidesthereof.

l2. In a resiliently padded roll, means Ifor preventing the progressive Wrapping tighter of Vthe fabric covering includingl a first length of fabric, resilient means forfanchoring Athe ,inner endV of said fabric to said roll, another length of fabric, resilienttineans for anchoring kthe inner end of said other length of fabric -to the rollatra point circumferentially spaced from theA anchoring point for the-first length, saidpieces of fabricbeing of suiicientlength to overlap and. Vprovide a double thickness covering throughout 'the Lperiphery off said roll.

In testimony whereof, I have signedmy name to this specification this th day'V of' September, 1929.

ARTHUR i-i. ADAMS;

fabricandiadapted to hold said'endin spaced y 'i relationitosaidbase'plate. v

" i 9. `'In aresiliently padded roll, means 7`fori`

Images