US2708336A - Textile mill spindle - Google Patents
Textile mill spindle Download PDFInfo
- Publication number
- US2708336A US2708336A US219662A US21966251A US2708336A US 2708336 A US2708336 A US 2708336A US 219662 A US219662 A US 219662A US 21966251 A US21966251 A US 21966251A US 2708336 A US2708336 A US 2708336A
- Authority
- US
- United States
- Prior art keywords
- barrel
- shaft
- whorl
- stub
- abutment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H7/00—Spinning or twisting arrangements
- D01H7/02—Spinning or twisting arrangements for imparting permanent twist
- D01H7/04—Spindles
- D01H7/08—Mounting arrangements
Definitions
- the invention relates to textile mill spindles of the type designed to be mounted in rows on the rail or frame of a spinning of twisting machine in generally upright position and with their bobbin-supporting blades or live spindle parts driven by a common belt or band in friction contact with whorl portions of the blades.
- the principal problem solved by subject invention is that of providing a more or less conventional steel spindle blade and whorl assembly with an enlarged diameter yet lightweight bobbinsupporting portion adapted to be used successfully with tube type or style bobbins such as are usually made of paper or fibre stock and which are sometimes made of wood.
- FIGs. 1 and 2 are cross-sectional assembly views of two different forms of composite spindle blades.
- Fig. 1 shows the preferred construction in case the portion now generally called the barrel is of steel or more or less leavy metal and Fig. 2 shows the preferred arrangement in case the barrel is of light weight metal such as aluminum or magnesium.
- Fig. 3 is an approximately double scale fragmentary sectional detail view of the composite spindle blade construction hereof.
- the hardened steel shaft 1 has, as usual, a smoothly finished shank portion 2 within the whorl 3 adapted for operative contact with a suitable bolster bearing, not shown (e. g. rollers), and a tapered lower shank end 4 for engagement with a footstep bearing.
- a suitable bolster bearing not shown (e. g. rollers)
- a tapered lower shank end 4 for engagement with a footstep bearing.
- the upper end of the whorl beyond the usual bandguiding upper flange 5 thereof has a more or less conventional acorn or hub portion 6 the upper end of which is'slightly reduced in diameter as at 7 for abutment with the lower end of the barrel 10 as at the joint 11.
- the barrel 10 may be cylindrical or slightly tapered upwardly and its upper end portion supports a bobbin drive head, top piece or tip 12 shown in the form of a plug having a shoulder 21 which forms one surface of a smooth joint 14.
- the tapered surface 13 of the tip engages the inner substantially mating surface at the upper end of the bobbin tube (not illustrated).
- the lower end of the bobbin tubev extends downwardly beyond the joint 11 and is guided by a smooth portion 7a of the reduced diameter region 7 of the acorn and surrounds the acorn in loose-fitting relationship therewith.
- the barrel 10 provides a filler between the whorl of the steel spindle shaft and the bobbindriving tip 12 of nearly the same upper and lower outer diameters as those of the acorn and tip respectively, so that the empty bobbin tube can be easily slipped over the spindle blade and, after loading, be easily doffed without encountering abrupt shoulders.
- the barrel 10 is of steel or other relatively heavy metal
- its mass is reduced as a first operation on the somewhat oversize blank (not shown) from which the barrel is formed by internally machining the top end of the blank as at 15 to such a depth as will leave only enough solid stock at the region generally designated 16 to assure a rigid support of the barrel on the top end portion or stub 17 of the shaft.
- the bore 15 is quite deep, most of barrel being broken away as illustrated.
- the stub for the greater part of its length is cylindrical but it preferably has a reduced pilot end portion 17a with an end chamfer to facilitate assembly into the barrel bore 18.
- a suitable bushing (not shown) is inserted snugly into the bore 15 (slip fit) for guiding the tool which then forms the bore 18 completely through barrel portion 16.
- the bore 18 is made slightly smaller than the stub portion 17 which is shown as telescoped by barrel portion 16 so that an extremely tight joint is secured between the stub and the barrel.
- Such joint may be effected simply by cold pressing the blade shaft and the barrel shank together in a well known manner, but preferably, in addition to press fitting, the barrel is heated considerably above the then temperature of the shaft (or the shaft chilled for temperature differential), so that, in effect, both a press fitting and shrink fitting is obtained.
- the stub portion is made of slightly larger diameter than the bore 15 and the top piece 12 is joined to the upper hollow end of the barrel 10 in exactly the same way as the shaft stub 17 is joined to the barrel. I find that it effects considerable saving in time to press the shaft and cap piece into the heated barrel from its opposite ends simultaneously, that operation thus requiring only a single heating of the barrel 10 in order to obtain the combination shrink and press fitting described above between the barrel 10 and the other two parts (top piece and shaft stub).
- top piece 12 is socketed at 31 as by drilling.
- either the lower end of the barrel or the upper end of theacorn 6 is dished (ma-deconcave) so as to provide a slight cavity as at 25 inwardly from. the perimetral regions of the joint Thereby like 13) can be formed directly on it, then the top piece (e. g. 12) need only beaplug for closing the counterbore 15 andto receiveithecenter drilling 23;
- the overall diameter is preferably in: creased for example in I he' neighborhood of .005" or greater and the knurled region is spaced from the adjacent shoulders of the pieces to provide, in elfect, undercuts 29 and 30 between the ;knurled regions and the shoulders.
- the knurl It should be mentioned that metal of the barrel 10 is of 'such nature that a Wear proof bobbin-seat" (e. g.
- A, composite textile mill spindle blade and whorl assembly of the type adapted to support tube style bobportion'ofthe "stub portion closely adjacent thelloweri end'of the barrel is enlarged relative to portions of the stub tion upwardly therebeyond, and the bore in the barrel tori-zed in the bins, said-assembly including a steel center shaft, and a metal barrel having an axialbore in its lower end portion tightly telescopingv an upper stub portion of the shaft and, in elfect, enlarging't he diameter and axial extent'of the upper end of the'shaft, and a steel whorl operatively rigid with ,theshaft audhaving an accordingtaortion in tight abutmentwith anaxialshoulder on the barrel, all around the bar-rel and of thesarne external diameter as the barrel, being" flush, therewith-"at the region of abutment; charac- "'b'sjtant'ial le
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Description
May 17, 1955 J. D. GLEITZ TEXTILE MILL SPINDLE Filed April 6, 1951 2 a m m a .m E \VCM\\ Q? INVENTOR JEROME D. GLEITZ a, z 72 $44 HITOQ/VS) United States Patent TEXTILE MILL SPINDLE Jerome D. Gleitz, Pepper Pike Village, Ohio, assignor to The Marquette Metal Products Company, Cleveland, Ohio, a corporation Application April 6, 1951, Serial No. 219,662 2 Claims. (Cl. 57-130) The invention relates to textile mill spindles of the type designed to be mounted in rows on the rail or frame of a spinning of twisting machine in generally upright position and with their bobbin-supporting blades or live spindle parts driven by a common belt or band in friction contact with whorl portions of the blades.
The principal problem solved by subject invention (indicating the general object) is that of providing a more or less conventional steel spindle blade and whorl assembly with an enlarged diameter yet lightweight bobbinsupporting portion adapted to be used successfully with tube type or style bobbins such as are usually made of paper or fibre stock and which are sometimes made of wood.
In the formation of composite spindle members of the sort outlined above and as shown by the embodiments illustrated herewith, it is essential that the portions of the assembly which directly support the bobbin be as nearly as possible concentric with the steel shaft by which the blade and whorl assemblies hence the bobbin and its load of yarn, are supported for turning. It is also essential that joints between the several parts wherever exposed for contact with the bobbin be closed and smooth, which is to say free from even slight recesses and abrupt shoulders such as would tend to collect and allow accumulation of dirt or lint. Additionally, it is necessary that the spindle as a whole be of as light weight or mass as possible so as not to add to the power required for turning the spindle and in order to minimize unbalanced weight in case the parts are not absolutely concentric. The present spindle blade and whorl assembly, regardless of the materials used to form it, meets the above requirements in a simple yet very practical manner thus indicating a further object of the invention.
In the drawing Figs. 1 and 2 are cross-sectional assembly views of two different forms of composite spindle blades. Fig. 1 shows the preferred construction in case the portion now generally called the barrel is of steel or more or less leavy metal and Fig. 2 shows the preferred arrangement in case the barrel is of light weight metal such as aluminum or magnesium. Fig. 3 is an approximately double scale fragmentary sectional detail view of the composite spindle blade construction hereof.
Referring first to the construction shown by Fig. l, the hardened steel shaft 1 has, as usual, a smoothly finished shank portion 2 within the whorl 3 adapted for operative contact with a suitable bolster bearing, not shown (e. g. rollers), and a tapered lower shank end 4 for engagement with a footstep bearing. Those bearings are appropriately housed in a bolster (not shown) the particular construction of which is immaterial to the present subject.
The upper end of the whorl beyond the usual bandguiding upper flange 5 thereof has a more or less conventional acorn or hub portion 6 the upper end of which is'slightly reduced in diameter as at 7 for abutment with the lower end of the barrel 10 as at the joint 11. The barrel 10 may be cylindrical or slightly tapered upwardly and its upper end portion supports a bobbin drive head, top piece or tip 12 shown in the form of a plug having a shoulder 21 which forms one surface of a smooth joint 14. The tapered surface 13 of the tip engages the inner substantially mating surface at the upper end of the bobbin tube (not illustrated). The lower end of the bobbin tubev extends downwardly beyond the joint 11 and is guided by a smooth portion 7a of the reduced diameter region 7 of the acorn and surrounds the acorn in loose-fitting relationship therewith. The barrel 10 provides a filler between the whorl of the steel spindle shaft and the bobbindriving tip 12 of nearly the same upper and lower outer diameters as those of the acorn and tip respectively, so that the empty bobbin tube can be easily slipped over the spindle blade and, after loading, be easily doffed without encountering abrupt shoulders.
Assuming the barrel 10 is of steel or other relatively heavy metal, then its mass is reduced as a first operation on the somewhat oversize blank (not shown) from which the barrel is formed by internally machining the top end of the blank as at 15 to such a depth as will leave only enough solid stock at the region generally designated 16 to assure a rigid support of the barrel on the top end portion or stub 17 of the shaft. 7 The bore 15 is quite deep, most of barrel being broken away as illustrated. The stub for the greater part of its length is cylindrical but it preferably has a reduced pilot end portion 17a with an end chamfer to facilitate assembly into the barrel bore 18.
In order to form the bore 18 which receives the blade shaft stub 17 in strictly accurate alignment with bore 15 a suitable bushing (not shown) is inserted snugly into the bore 15 (slip fit) for guiding the tool which then forms the bore 18 completely through barrel portion 16. The bore 18 is made slightly smaller than the stub portion 17 which is shown as telescoped by barrel portion 16 so that an extremely tight joint is secured between the stub and the barrel. Such joint may be effected simply by cold pressing the blade shaft and the barrel shank together in a well known manner, but preferably, in addition to press fitting, the barrel is heated considerably above the then temperature of the shaft (or the shaft chilled for temperature differential), so that, in effect, both a press fitting and shrink fitting is obtained.
Assuming the tip or top piece 12 has been properly formed with a cylindrical stub portion 20 and the smooth shoulder 21 defining one end of it, the stub portion is made of slightly larger diameter than the bore 15 and the top piece 12 is joined to the upper hollow end of the barrel 10 in exactly the same way as the shaft stub 17 is joined to the barrel. I find that it effects considerable saving in time to press the shaft and cap piece into the heated barrel from its opposite ends simultaneously, that operation thus requiring only a single heating of the barrel 10 in order to obtain the combination shrink and press fitting described above between the barrel 10 and the other two parts (top piece and shaft stub).
Further to reduce the weight of the blade assembly the top piece 12 is socketed at 31 as by drilling.
It is a difiicult manner to obtain concentricity between the shaft, barrel and tip and for practical purposes almost absolute concentricity must be achieved or the spindle blade assembly will not run true in its bolster bearings, particularly when the bobbin tube is loaded with yarn. By using a bushing as described above in the counterboring 15 in order to locate the tool or tools which perform the axial boring 18, the shaft and barrel can be made truly concentric; and since the surfaces of top piece portions 13 and 20 are formed in a single operation, as on a screw machine, it is apparent that the tube supporting or seat surface 13 for the bobbin will necessarily be concentric with the spindle blade.
At any step in the procedure and preferably after the arts toward each" other done cold). 7 from happening, I have found that by making for example parts have been assembled as described, the footstep and bolster beating portions 2 and 4 of the shaft are accurately located in a suitable fixture or chuck andta center drilling 23 is then formedat the extremity of the toppiece 12 so as to be, accurately co-faxial with the shaft; Thereafter a considerable amount of stockiis removed from the barrel blank (not shownlas on a l-athe or grinder; and inso doing the joints 1-1 fahd14 are made smoothly flush with the associated partsQIeaVing no gaps which could later receive lint or dirt. I v a t order to obtain a recess-free exterior surface at the joint 114M example, either the lower end of the barrel or the upper end of theacorn 6 is dished (ma-deconcave) so as to provide a slight cavity as at 25 inwardly from. the perimetral regions of the joint Thereby like 13) can be formed directly on it, then the top piece (e. g. 12) need only beaplug for closing the counterbore 15 andto receiveithecenter drilling 23;
I Sometimes when the barrelfltl is heated prior to pressing the shaft" stub 1 7, and top piece into place as described, the subsequent-cooling of the barrel results in opening of sligh tigaps'at the joints 11 and 14, which then have to be re-closed by a second axial pressing of the To prevent that the. portion indicated 27 of the shaft stub slightly larger than main diameter of the stub (best shown at 27 in Fig. 3) or, alternatively,*by enlarging its diameter through ordinary k'nurling, such separation of abutting surfaces at the joint does not occur; The reason is that when the combined press and shrink fitting operation is completed and the parts have attained uniform temperature the pressure of the barrel metal against the shaft stub in region 27,, Fig. 1, or 27 Fig. 3, is greater than at any other portion of the stub. During shrinkage of the barrel due to cooling should any relative travel or creeping between the'ba'rr'el and stub occur, it will be in some region other than that indicated at 27 -or 27 wherefore the joint will not open. The sarne treatmentis preferably given the tip,
shank, for examplelocal enlargement as by knurling. of
it 'in the region indicated at 28 which is nearest, the joint;
, When the knurling 27 and 23 is; done by the usual method of rolling the overall diameter is preferably in: creased for example in I he' neighborhood of .005" or greater and the knurled region is spaced from the adjacent shoulders of the pieces to provide, in elfect, undercuts 29 and 30 between the ;knurled regions and the shoulders. Thereby, particularly on thetip 12, the knurl It should be mentioned that metal of the barrel 10 is of 'such nature that a Wear proof bobbin-seat" (e. g.
ing does not interfere with the obtaining of a tight butt joint.
Exactly the same procedure as described above is preferably employed in the making of the blade assembly shown in Fig. 2 except that because the barrel 10a is of light weight metal, for example aluminum or magnesium, the upper drilling at 15a for the top piece 12a does uot communicate with the lower drilling 18a which receives the'sha f't stub 17. Otherwise there is no important difference in the technique employed for forming the two illustrated constructions.
I claim:
1. A, composite textile mill spindle blade and whorl assembly of the type adapted to support tube style bobportion'ofthe "stub portion closely adjacent thelloweri end'of the barrel is enlarged relative to portions of the stub tion upwardly therebeyond, and the bore in the barrel tori-zed in the bins, said-assembly including a steel center shaft, and a metal barrel having an axialbore in its lower end portion tightly telescopingv an upper stub portion of the shaft and, in elfect, enlarging't he diameter and axial extent'of the upper end of the'shaft, and a steel whorl operatively rigid with ,theshaft audhaving an acordtaortion in tight abutmentwith anaxialshoulder on the barrel, all around the bar-rel and of thesarne external diameter as the barrel, being" flush, therewith-"at the region of abutment; charac- "'b'sjtant'ial leng'th portions ofthe stub portion functi g'ft h'rough the operative rigidity of the, shaft wit e whorl to maintain said ,abutmenttduring use of theassembly, are fitted very into the barrel bore, and further characterized in that the metal of the portion'of the barrel which defines thelowerend of the barrel is under greater radial stress, by being tighter on the stub' portion, than along any other portion of the bore.
2 The vconstruction according to claim 1 wherein the orm diameter. ,"Refei'en'ces Cited in'the'file of this patent f; p 'Ul-SIITED STAT-ES PATENTS at; 10,288; 1: I Birkenhead t Feb. '20, 1883 928,9:47- Dawson July'27, 1909 21,157,666 Bennett Oct. 26, i 1915 2,2462475 Stahleeker T June 17, 1941- 2,267,'3-39 vP'aulsen Dec. '23, 1941 2,284,269 i Castella-nos Q. May 26, 194 2- 2,304',370- gNeaI Dec. 8, 1942- 2, 4;lf7 -,48;5"-; "Gleitz et al. Mar. 18, 1947' '2;4 4 l6 ;5 l5 Weingart Aug. 3, 1948 2,463,484 Gelpke Mar. "1, 1949 2,536,618 Wood Jan. 2, 1951 2,541,802 ,WOOCl Feb. 13-, 1951 2,556,674 Cabotet al.- June12, 1951 FOREIGN PATENTS --2 20,-48 1 Switzerland July -1, 1 942 452,325 I 7 ;,Germany r Nov. 9, I927 591,383- Germany Jan. 19, 1934 ;Eran'ce. Jan. '17, 19-21
Claims (1)
1. A COMPOSITE TEXTILE MILL SPINDLE BLADE AND WHORL ASSEMBLY OF THE TYPE ADAPTED TO SUPPORT "TUBE" STYLE BOBBINS, SAID ASSEMBLY INCLUDING A STEEL CENTER SHAFT, AND A METAL BARREL HAVING AN AXIAL BORE IN ITS LOWER END PORTION TIGHTLY TELESCOPING AN UPPER STUB PORTION OF THE SHAFT AND, IN EFFECT, ENLARGING THE DIAMETER AND AXIAL EXTENT OF THE UPPER END OF THE SHAFT, AND A STEEL WHORL OPERATIVELY RIGID WITH THE SHAFT AND HAVING AN ACORN PORTION IN TIGHT ABUTMENT WITH AN AXIAL SHOULDER ON THE BARREL, ALL AROUND THE BARREL AND OF THE SAME EXTERNAL DIAMETER AS THE BARREL, BEING FLUSH THEREWITH AT THE REGION OF ABUTMENT; CHARACTERIZED IN THAT SUBSTANTIAL LENGTH PORTIONS OF THE STUB PORTION FUNCTIONING THROUGH THE OPERATIVE RIGIDITY OF THE SHAFT WITH THE WHORL TO MAINTAIN SAID ABUTMENT DURING USE
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US219662A US2708336A (en) | 1951-04-06 | 1951-04-06 | Textile mill spindle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US219662A US2708336A (en) | 1951-04-06 | 1951-04-06 | Textile mill spindle |
Publications (1)
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US2708336A true US2708336A (en) | 1955-05-17 |
Family
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Family Applications (1)
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US219662A Expired - Lifetime US2708336A (en) | 1951-04-06 | 1951-04-06 | Textile mill spindle |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4205423A (en) * | 1977-01-10 | 1980-06-03 | The Kendall Company | Method of retipping top-drive filling spindles |
Citations (16)
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---|---|---|---|---|
US928947A (en) * | 1908-07-06 | 1909-07-27 | Sieber & Trussell Mfg Company | Means for uniting metal parts. |
US1157666A (en) * | 1914-07-27 | 1915-10-26 | George M Bennett | Method of securing an apertured member to a cylindrical member. |
FR519121A (en) * | 1916-07-22 | 1921-06-04 | Thomas Henry Smith | Improvements to spindles for spinning, doubling, twisting and other machines used in the production of yarns and yarns of fibrous materials |
DE452325C (en) * | 1926-08-07 | 1927-11-09 | Rheydter Maschinen & Spindelfa | Attachment for spinning and twisting spindles |
DE591383C (en) * | 1934-01-19 | Hans Koenig | Device for fastening and centering large paper or cardboard sleeves on ring spindles | |
US2246475A (en) * | 1939-01-04 | 1941-06-17 | Ver Kugellagerfabriken Ag | Upper part for spindles |
US2267339A (en) * | 1938-09-19 | 1941-12-23 | Henry M Paulsen | Method of joining tubes, rods, or the like |
CH220481A (en) * | 1941-04-07 | 1942-04-15 | Spindel Motoren & Maschfab | Spool carriers for textile machines. |
US2284260A (en) * | 1940-11-15 | 1942-05-26 | Hughes Tool Co | Method of making sealing supports for tool joints |
US2304370A (en) * | 1941-10-10 | 1942-12-08 | Saco Lowell Shops | Spindle mounting for spinning and twister frames |
US2417485A (en) * | 1945-04-18 | 1947-03-18 | Marquette Metal Products Co | Mounting for textile mill spindles |
US2446515A (en) * | 1945-03-24 | 1948-08-03 | Richard I N Weingart | Method of forming bearing structures |
US2463484A (en) * | 1947-01-08 | 1949-03-01 | Gelco Dev Corp | Spindle adapter |
US2536618A (en) * | 1949-06-10 | 1951-01-02 | Whitin Machine Works | Spindle for use in textile machines |
US2541802A (en) * | 1949-06-10 | 1951-02-13 | Whitin Machine Works | Spindle for use in textile machines |
US2556674A (en) * | 1949-04-26 | 1951-06-12 | Reconstruction Finance Corp | Spindle for tubular yarn carriers |
-
1951
- 1951-04-06 US US219662A patent/US2708336A/en not_active Expired - Lifetime
Patent Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE591383C (en) * | 1934-01-19 | Hans Koenig | Device for fastening and centering large paper or cardboard sleeves on ring spindles | |
US928947A (en) * | 1908-07-06 | 1909-07-27 | Sieber & Trussell Mfg Company | Means for uniting metal parts. |
US1157666A (en) * | 1914-07-27 | 1915-10-26 | George M Bennett | Method of securing an apertured member to a cylindrical member. |
FR519121A (en) * | 1916-07-22 | 1921-06-04 | Thomas Henry Smith | Improvements to spindles for spinning, doubling, twisting and other machines used in the production of yarns and yarns of fibrous materials |
DE452325C (en) * | 1926-08-07 | 1927-11-09 | Rheydter Maschinen & Spindelfa | Attachment for spinning and twisting spindles |
US2267339A (en) * | 1938-09-19 | 1941-12-23 | Henry M Paulsen | Method of joining tubes, rods, or the like |
US2246475A (en) * | 1939-01-04 | 1941-06-17 | Ver Kugellagerfabriken Ag | Upper part for spindles |
US2284260A (en) * | 1940-11-15 | 1942-05-26 | Hughes Tool Co | Method of making sealing supports for tool joints |
CH220481A (en) * | 1941-04-07 | 1942-04-15 | Spindel Motoren & Maschfab | Spool carriers for textile machines. |
US2304370A (en) * | 1941-10-10 | 1942-12-08 | Saco Lowell Shops | Spindle mounting for spinning and twister frames |
US2446515A (en) * | 1945-03-24 | 1948-08-03 | Richard I N Weingart | Method of forming bearing structures |
US2417485A (en) * | 1945-04-18 | 1947-03-18 | Marquette Metal Products Co | Mounting for textile mill spindles |
US2463484A (en) * | 1947-01-08 | 1949-03-01 | Gelco Dev Corp | Spindle adapter |
US2556674A (en) * | 1949-04-26 | 1951-06-12 | Reconstruction Finance Corp | Spindle for tubular yarn carriers |
US2536618A (en) * | 1949-06-10 | 1951-01-02 | Whitin Machine Works | Spindle for use in textile machines |
US2541802A (en) * | 1949-06-10 | 1951-02-13 | Whitin Machine Works | Spindle for use in textile machines |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4205423A (en) * | 1977-01-10 | 1980-06-03 | The Kendall Company | Method of retipping top-drive filling spindles |
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