US1499781A - Pipe covering and method of making same - Google Patents

Description

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F. s.. PILLIOD MPE covERiNG AND METHOD oF MAKING SAME v Filed Nov. 6, 1922 @Mmemw M (am 53516 fla; @Miam/1,12%, 'I

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FREDERIC L. PILLIOD, 0F PLAINFIELD, NEW J EY', assrervoa 'ro .Tonus-Marivaux INCRPORATED, A COORATION 0F NEW YOil i2 Pira covnnmeann non or n Application med November 6, 1932]. Serial No. 599,180.

To allwlwm z't may concern:

Be it known that I, Fnannmo L. Palmen, a citizen of the United States of erica, residing at 1216 Ever Y- n Avenue, Plainfield, county of Union, Jersey have invented certain new and useful improvements in Pipe Coverings and Methods of Making Same, of which the following is a specication.

My invention relates to the manufacture of non-heat conducting covering for steampipes or water-pipes, etc., and more particularly comprises certain improvements in the particular character of sectional pipe covering designed for use on pipe conveyin a cold iuid, the function of said covering ing to protect the duid from access of heat and to prevent the deposition of moisture on the surface of the pipe, such 4as would otherwise result from condensation thereon oit moisture of the atmosphere.

Pipe covering of this kind is generally made by winding up a web ont some light porous material, such as woolfelt, and the problem is to protect said material from 4the action of moisture which tends to disintegrate the same and to do this without unduly increasing the cost and diculty of the process of manufacture.

My present invention accomplishes these desired results and the completed pipe covering and the various steps of its manufacture are illustrated in the accompanying two sheets oi drawings in vwhich Fig. l is a side elevation of the preferred form of apparatus on which my pipe cover-- ing may be manufactured, parts being shown in section or broken awa Fig. 2 is a detailed view of the referred form of the paste-applying roller orlning a part of this apparatus; l

Figs. 3, 4 and 5 are diagrammatic views with parts broken away showing various stages of the winding operation by which the pipe covering is formed; v

Fig. 6 is a perspective view showing several lengths of the pipe covering as the same are assembled in use;

Fig. 7 is an end view of a section of pipe covering after the same has been slit longitudinally, but before the final covering has been applied; p f

Fig. 8 is an end view of the completed covering applied to the pipe, the latter being shown in cross-section, and

lFig. 9 is a side view of the pipe and covermg, parts being broken away.

Throughout the drawings like reference' characters indicate like parts.

1 is the main frame of the winding chine'on which is supported the guide rollers 3'and 4 and man rel 5 for handlin the web of wool-felt 17 which is origina y. wound 'up in a roll 22 on spool 2. o is a pulley which is driven by the power belt 7 and from which motion is transmitted' by belt 10 to themandrel 5. 8 is a fountain oi liquid cementitious .materiah' such as a solution of silicate of soda in `which the :freely journaled roller 9 is partly immersed. 11 is any suitable ch'ain and sprocket earing by which motion is transmitted rom mandrel 5 to paste roller 12 journaled in the paste fountain 15 and in contact with the circular ribs or danges 14: on the..A roll 13 which is journaled in the swin 'ng vframe 28. This frame is pivoted on t e shaft of paste roller 12 So that the roller 12 and the ribs 14 on roll y13 are always in contact. 16 is any suitable table supported by the main frame 1 and over which table the web of wool-felt 17 runs just before reaching the vmarul'rel 5.v Preferably silicate of soda solution' is also used in the `fountain 15.

Such being the construction of the apparatus the preferred method of winding up sections of wool-felt web 17 to form pipe covering is as follows:

rlhe `web -of wool-felt 17 is threaded through the machine so that the end thereof rests upon table 16, as illustrated in Fig. 3.

The operator then takes a strip of smoothfaced material 18, which is preferably asbestos paper previously saturated in asphaltum so as to make it waterproof and which has a length equal to the width' of the wool-felt web 17 and width suticient to wind once around the mandrel 5, and after passing said strip of material 18-over the cement paste reservoir or ool 2, the

carrying roller 9 so as to coat its under-surface, deposits the` strip 18 upon the end of the web17 as sho'wn in Fig. 3, thus cement- Aing said strip to the end of said web.- The ley 6 is rotated by the power belt 7 in a direction such as to give said mandrel rotation in al the strip of paper I counter-clockwise direction. vllhis winds the web of wool-felt 17 up on mandrel 5 with 18 on the inside ofthe tube so formed, as indicated in Fig. d, until a given thickness of wall of the tube so formed is'attaincd. Preferably the section of tubing 21-so formed has a thicmess of wall approximating one-half the thickness of wall of the desired pipe covering to the manufactured. During this winding operation the swinging frame 28 has been swung over into the position shown in broken lines in Fig.` 1 carrying with it the paste roll 13v so that the flanges or ribs 14a thereon have rested upon the exterior of theweb of wool-felt 17 as it was being wound upon the mandrel 5. This has caused the superimposed coils of the wool-felt 17 to be cemented together by intervenin lines of silicate of soda. When the proper 'ckness of wall of tube section 21, shown in Fig. 4c, has been attained, the winding operation is stopped for' an interval of time and the operator picks up two sheets of waterproof asbestos paper 19 which are placed one upon the other, each being long enough to extend across the web of wool-felt 17 and wide enough to wind around the tube section 21 alr' ady formed, the under surface of the lower s yeet 19 being covered with a coating of cement' by passing the two sheets over the paste roller 9. rl`he operator then deposits these two sheets of paper 19 upon the wool felt supported by table 16 wit the cementbearing surface underneath, as indicated in Fig. a, thus cementin the underlayer of paper 19 to the woolelt. The winding -up of the wool-felt, and the sheets of paper 19 carried thereby, on the mandrel 5 is then resumedb putting the mandrel again in rotation. s the upper. of the two sheets of paper 19 comes in contact with the surface of the tube section 21, as it is rolled on. to the same, it is cemented thereto by the action ofthe strips of silicate of soda which have been deposited on the surface of the tube by the anges 14 on the paste roller 13.

Continuing the winding-up of the woolfelt web until the tube sections so formed. have an aggregate thickness of wall equal to the thickness of wall of the desired pipe covering, a structure such as shown in Fig. 5 is produced in which one of the` intertwined sheets of waterproof paper 19 is cemented to the'inner surface of the outer section 27 of the tube wall, while the other sheet of paper 19 is cemented to the outer surface of the inner section 21 of said tube. 'lo properly complete the job, the operator then takes' a sheet of waterproof asbestos paper 20 whichis of -a width suiiicient to wind twice around the outer section 27 of the pi e covering and, after applying a coating ci) silicate of soda to the under surface of the said sheet 2 0 by passing it over paste roller 9, places it upon the web 17 of wool-felt, as indicated in Fig.

accesar 5, this being done while the winding is again temporarily interrupted. @n resumlng winding operations, this sheet of paper 20 is wound twice around the outer section of pipe covering, leavin a gojecting flap 23 as shown in Fig. 'l e around the mandrel 5 is then removed therefrom and slit longitudinally along an elevment of its cylindrical surface, as indicated at 24: in Fig.' 7. Preferably, this slitting is `done along a radial plane which passes l through the overlapping ends yof the several sheets of waterproof paper 18, 19 and 20, but this is not necessary. Preferably a final covering of muslin 28 is wrapped around the outer tube and cemented thereto, as indicated in Figs. 8 and 9.

When the covering so formed lis applied to a pipe 25, as indicated in Fig. 8, the sections 21, 27, are spr ung apart so that they may be snapped over the pipe through the slit 2t'.

tube thus formed y The said sections are then twisted andslid i Having properly arranged the flap 2.3 of

each section, it is pasted down vin the position shown in Fig; 8 and the wrapping 28 also has its iaps eld down by any suitable means and preferably a binding strip of flexible metal 26 .is drawn tightly around each section, as shown in Fig.l 9.

rlhe advantages of my invention comprise the combination with light, porous, heat-insulating wool-felt or similar material, of the layers of dense waterproof paper 18, 19 and 20, or similar material, which completely protect the wool-felt fror4 the access of moisture both from the outside of the covering or from the inside of the covering, the division of the wool-felt body of the covering into two sections which have their opposing faces covered by the hard smooth paper sheets 19, so that they may slip one over the other for the purpose of breaking joints, and thesimple and rapid process by which such composite pipe covering is wound up on a rapidly rotating mandrel. The sheets of waterproof paper 19 also form a useful function 1n preventing access of moisture from one section of the pipe cover to the'other so that if the extreme inner or outer covering of the wool-felt is penetrated by moisture only one section of the pipe covering will be deteriorated thereby, the other still being maintained in a dry condition by the intervening sheets of waterproof paper 19. v

lt is evident that certain minor changes in the arrangement of parts and methods of procedure might be made without departing from the underlying principle of my invention. rlhus, for instance, the u per of ias A accessi per uncemented surface of the lower remaining vsheet 19 `to the inner section of the pipe covering 21 avoided by .lifting the paste roll 13, 14, out of contactwith said section 21 while the sheet of-paper 19 is being wound in. This would leave the sinle sheet of paper 19 then used. pasted to vt e inner surface ofthe outer section 27 of the completed (pipe covering, but with its' other uncemente surface in contact with a dry and uncemented section of the woolfelt web 17, so that whenthe com leted covering is slit, as shown in Fig. the two sections 21 and 27 may be twisted and shifted one upon the other, as indicated in Figs. 6 and'8, almost as freely as though the two sections of paper 19 had been-em- -ployed as described in the preferred method of carrying out my invention.

The joints in the inner and outer sections being out of line one with the other, the penetration of moisture through a bad joint in the outer section stops at the outer sur face of the inner section, and the same is true of the circulation of air in spaces formed by abad joint.

Having described m invention, l claim: 1. The herein descri ed process of forming sectional pipe covering which comprises the following steps: first, cementing to the end of a web of non-heat conducting material, such as wool-felt, a strip of waterproof material, such as saturated asbestos paper, which strip of paper is as long as the web is broad and wide enough to extend around the circumference of the pipe to be covered, and then winding the web around a mandrel of proper diameter with the waterproof strip next to the mandrel, and' applying cementitious matter to theexterior of said web during the winding process, continuing euch windmg until a tube is formed of a thickness of wall e ual to a predetermined fraction of the thickness of wall of the pipe covering to be produced; second', cementing a second strip of smooth-surfaced material to the same surface of the web of wool-felt as that to which the above mentioned strip has been first applied, said second stri being of a length equal to the width o the said web and of a width sucient to extend o'nce around the tube then formed by the winding of said web, and superposing on the uncemented face of said strip another of similar size free from cementitious material; third, continuing the Winding and cementing of the web until a tube of the thickness of the lwall of the der so formed.

2. The herein described process of forming sectional pipe covering which comprises the followin steps: first, cementing to the -end of a we vof non-heat conducting material, such as wool-felt, a. strip of waterproof material, such as saturated asbestos paper, which strip of paper is as long as the web is broad and wide enough to extend around the circumference of the pipe to be covered, and then winding lthe web around a mandrel of proper diameter with the waterproof strip next to the mandrel, and applying cementitious matter to the exterior of said web during the winding process, continuin such wlnding until a tube is formed o a thickness of wall equal to a predetermined fraction of the thickness of wall of the pipe covering to be produced; second cementing a second strip of smooth-surfaced material to the samesurface of the web of `wool-felt as that to which the above mentioned strip has been irst applied, said sec" ond stri being of a length equal to the width o the said web and of a width sum.-

cient to extend once around the tube then formed by the winding of said web, and 4 superposing on the uncemented faceof said strip another of similar size free from cementitious-material; third, continuing `the winding and cementing of the web until a tube of the thickness of the wall of the desired completed pipe covering is obtained, cementing to the last wound portion of the web a strip of waterproof material as lon as the width of the web and wide enoug to extend at least once around the completed tube, and, fourth, slitting the wall of said tube lengthwise along one end of the tube so formed.

3. llhe process, such as described in claim 2, in which' all the inserted strips of material are also waterproof.

4. The process, such as described, in claim 2, in which the'inserted strips of material are wound around into the tube in such position that their overlapping edges lie approximately in the sameradial plane along which plane the final slitting operation is performed.

5. As an article of manufacture, a sectional pipe covering comprising twonested longitudinally slitted tubes each composed of a. superposed Ilayer of non-heat conducting material cemented together and a layer of smooth-faced material located between the adjacent surfaces of two tubes so formed and cemented to one of the only whereby .the two tubes when applied to a pi'pe as a covering therefor can be. slid one upon the other both circumferentially and longitudinally for the purpose of breaking joints.

6. As an article of manufacture, sectional pipe covering comprising two nested, longitudinallv slitted tubes each composed of superposed layers of a non-heat conductin material with a layer of waterproof materia lying between them.

7. As an article ofmanufacture, sectiongitu nally slitted tubes each composed of superposed layers of a non-heat conducting material with a layer of waterproof material lying between them, a second layer of waterproof material lining the inner tube anda hird `layer of waterproof material forming vpart of the exterior Wall of the outer tube.

8. As an' article of manufacture a sectional pi ie covering comprising two, nested, longitu inally slitted tubes each composed of mennen superposedlayers of a non-heat conducting material cementedy together with a layer of smooth-faced material cemented to the inner surface of the outer tube and a l'ayer of similar material cemented to the outer sur- .face ofthe inner tube, whereby when a series ofsuch nested tubes are placed end to end vinline one with another the outer tubes may

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