Патент USA US2411874код для вставки
~ Dec, 3,1946, ‘ M. E. GOLDEN _ METHOD OF M ‘ ‘ OOTS 2,411,874 ' ' 2,4ii,874 Patented Dec. 3, 1946 UNITED STAT-E s PATENT orgies 2,411,874 METHOD OF MAKING HOLLOW FLEXIBLE I ' > ' BOOTS Milton E. Golden, Chicago, 111. Application November 27, 1943, Serial No. 511,930 , 2 Claims. (01. 64-32) (Granted under the act of March G. 3, 757) 1883, as amended April 30, 1928; 3'70 0. The invention described herein may be manu factured and used by or for the Government for governmental purposes, without the payment to ‘me of any royalty thereon. washeris then slit to compose a split washer [2, Fig. 2, the slit extending from the inner diameter M of the washer to the outer diameter l6, thereby providing the piece with two abutting ends “3 ’ and 20. I The ends l8 and 2B of the split washers l2, Fig. This invention relatesto ?exible boots of the 2, are then pulled apart as shown in Fig. 3, so as kind employed to encase a mechanical structure to compose of each piece an exaggerated lock which is subject to elongation or bending in washer shape ‘22, each piece thus composing one operation. Boots of this class are employed-to keep lubrication in, or'dirt out, or both, yet they 10 turn of a helix. Three pieces thus treated are shown in Fig. 3, being numbered 22, 22a and 221), must allow freedom of movement of the mech the ends of the first piece being referred to as 18 anism within. and 20, the ends of the second as l8a and 20a, An object of the invention is to provide a boot and the ends of the third as I81) and 20b. of this description which may be made of readily available material with minimum waste of stock 15 The adjacent ends of the several helical turns 22, 22a and 221) are next fastened together in used and time consumed in the making. some suitable manner being preferably sewn if Another object of the invention is to develop a the material is ?exible fabric, or being soldered novel ‘method of producing the device which is herein shown and described as an embodiment of myOther invention. objects and advantages Will be evident as the invention is further described and reference ~ is made to the drawing, wherein: Fig. 1 shows a washer cut from sheet material, this being a ?rst step in making one of the units or welded if it is metal, the end 29 being joined to lBa, 29a to I81), etc. When the several ends have been thus joined together, a continuous helix 24, Fig. 4, will have been formed, having an inside helical edge Illa and an outside helical edge Ilia, the individual convolutions being designated 24a, 2419,2150 and 24d. 25 When two helices M, as shown in Fig. 4 have been provided, theymay be put together as shown Fig. 2 shows the washer of Fig. l-after it has in Fig. 5, the second helix, however, being as been cut through on a radial line, this being the signed the numeral 25 to facilitate description, second step in the production of a unit of my and its individual convolutions beingv for the device. Fig. 3 shows a series of the cut washers of Fig. 2 30 same reason given the numerals 25a, 25b, 25c and 25d. The inner edge of the helix 25 will be re after the ends, which were provided by the cuts, ferred to as Mb and the outer edge ltb. were drawn apart so as to. pull each washer into After the two helices 24 and 25 have been a somewhat exaggerated lock washer shape. assembled as shown in Fig 5, the inner edges of Fig. 4 shows a series of the lock washer shapes of Fig. 3 with the end of one washer permanently 35 the two, that is, the edges Ma and “lb may be laid together and sewn or otherwise joined as joined to the beginning of the next so as to pro shown in Fig. 6. The sewing together of these vide, of the several separate washers, a continu two edges will consist of one continuous seam ous helix. ' throughout the length of the helices. At this Fig. 5 shows two of the helices of Fig. 4 laid to gether with the convolutions of one alongside the 40, stage the outer edges i511 and Nib still lie along side but are not fastened together. convolutions of the other preparatory to joining After the two helices 24 and 25 are thus joined their edges. at the inner edges Ida and Nb, the outer edges Fig. 6 shows how the inner edges of the two Ilia and Hib are pulled apart as shown in Fig. '7, helices of Fig. 5 may be permanently joined, while the outer edges lie contiguous but are not 4.5 and paired anew, that is, instead of 25a and 25a of my device. lying alongside, 25a will be paired with 24b, 25b fastened together. will be paired with 240, 25c with 24d, etc. Fig. '7 shows how the outer edges of contiguous When the outer edges are now sewn together convolutions of Fig. 6 are drawn apart prepara tory to securing them together, the one of one in one continuous seam, the device will have as 50 sumed the con?guration of Fig. 8, that is, it will pair to the other of the next pair. Fig. 8 shows the drawn-together outer convo have the form of a hollow V screw thread. Here lutions after they have been permanently joined. the inner edge of 24a. is paired with the inner In the drawing, a series of washers l9, Fig. 1, are preferably cut from a sheet of ?exible fabric,‘ or thin metal, as the case may require- Each 55 edge of 25a, then the outer edge of 25a with the outer edge of 2%, etc. Finally appropriate end I 2,411,874 pieces 26 and 27 are joined to the ends of the screw, their shape depending on the shape of the part which is to be housed. consists of cutting out a series of washers, radi ally slitting said In addition to the concentric helically shaped exible boot made of circular discs of uniform diameters as hereinbefore described, various con acter indicated. It is noted that since the boot is built in the form of a helix it is obviously stronger than one made of circular discs in the conventional man 10 ner, that is, sewn together along their inner and continuous seam, the ?rst convolution of the sec- ond helix to the second convolution of the ?rst outer circumferences. Distortion and stresses 15 helix. are transmitted in a helical direction to all sec tions of the assembly simultaneously and uni formly, thus making the working life of the boot, made according to subJect invention, longer. It is further noted that a boot made to subject invention of 2. ‘Steps in the method of making a hollow ?ex ible boot ' ' 20 25 1. The method of making a hollow ?exible boot from relatively thin ?exible sheet material, which MILTON E. GOLDEN.