US2474672A - Mandrel - Google Patents

Description

E. G. HILL June 28, 1949.

MANDREL Filed June 4, 1947 2/ 23 Fla.

INVENTOR 2Z1 2% A462 ATTORNEYS Patented June 28, 1949 Application .June. 4. 1947;.Seria1No, 752,409 r A Claims.

This invention relates to mandrels, such as are used for: supportingv a tubular: core; while --yarn is wound thereon to form a yarn package.- More particularly, the -invention is --concerned with a novel mandrel for the purpose mentioned; is .of simple. construction,- ligl'r't in-weight, and highly durable. The new mandrel is made" entirely of -meta1,;so-that it is not affected by atmospheric eondi'tionsandit is 'so constructed that it iisz-not likely to be m-lured or distortedduring handling; Its "dimensions; accordingly; remain constant-throughout 'its use and autube can 'be readily mounted-onit-orremoved thereirom'without sticking. It includessimple means -for-holding the tube-in proper position longitudinally'a-nd such means operate automatically to-anchor :the tube; as the (latter is-telesooped over -the mandrel, and may be-made to-re1easethe "tube-"with little effort. The mandrel provides excellent support for the tube,- While the latter is rotated during the winding operation and it is --not substantially longer than the tube, sothat-itsmse does-not require additional space-in the winding machine.-

For a betterunderstanding of the-invention; reference may be made-to -the accompanying drawing, in which Fig. 1 is a longitudinal sectional view on-: t h,e. line -il of Fig, 2 of one iornrofthe-newmandrel with a tube mountedthereon; i

Fig. 2 is 'an end -=view' lookingfromq-the left "in Fig; 1;

Fig. 3 is a-nend-view-looking1ronr'the rigiit'in Fig. 1;

Fig. 4 is a sect-ional view-on the line 4-4 of Fig. 1;

Fig. 5 is anend view of "the cap; and

Fig-.6 15 a viewin perspective-of themain body of the mandrel.

The mandrel in the form 'showninzthe drawings comprises a bar l llof "generally Yesection; the bar preferably including -a-cylindrical central "section I l from which radiateth-reeblades lipwhiich-are of equal length and equhangularlyspaced; The bar is preferably made of alight -meta'l, suchyas aluminum or magnesium; and it may be produced in indefinite lengthbyan extrusion operation and then cut into sectlons appropriate foruse for so that the bar is strong and :will not =be distorted or damaged. during handling as; for example, if it isdropped.

The .bar is provided atpone endxwith around cap"l3, which is preferably formed of sheet metal,

for example, aluminum or magnesium, and may be producedrby a stamping operation. The cap has-a diameterrslightly greater than "that of ':the cylinder describedfby-rotation of "the *bar 110' on its "axis and, during the formation of the' cap, itisrprovided'with a central, opening Mand an oifsetrperipheral 'fiangeg'lfiz Also, as an incident to the production of the cap, three equiangular s-paced tongues Hi are 'stuck-irom the" cap-to extend at rightan-gles to -the-p1ane thereof.

The mandrel *is provided; with steel gudgeons l='l l8 Whichare -mounted-intthe ends of the barll; 'toextend coaxially therewith; The ,gudgeon I .1 is "forciblyinserted into an opening drilled in one end of the cylindrical section |=l 0f the bar and iisheld in place frictionally. The other gudgeon l8 has anwenlarged'end 13a, whichisinserted inan' opening-in the otherend-of the cylindrical section ll of the bar. The main body of 'gudgeon i8 is ofsl-ightly less "size than th-e opening I' l through the cap-and in-orderto holdthe'gudgeon in place, its enlarged end is forced into the openingwtherefon inthe endotthe' ban; and thereaften-the-can I3 is plaoed against the end of "the banwith the *tongues Shearing-against the-faces of the-respective blades 12. The-"tongues are thensecured tothe blades by rivets 19; eachof which is passed through an-0pening-20- f0rmed in the blade and through an opening in the-tongue and then-headed over; The edge-of the cap around the opening-lilies against the outer face-of the en1arged-end-ltaof the gudgeon, sothat-the gudgeon-is helds i-n place partly byirictionand partly by-means of the cap.

The mandrel is "provided-with means Tor-anohoring the tuhe imposition longitudinally thereon and such means take the; form of a' springpressed cletent. The detent illustrated is a plunger M; which is -of enlarged d-iameterat-one end; The "plunger is mounted in-apassage '22, which =extendsthrough the cylindrical sectionll of the-bar-andthrough one ott'the-blades to the outer edge' thereof; The'tpassage has sections of dilierentdiametera-nd, as 'theplunger-is moved outwardly-through the passage; its enlarged end 2Ia seats against a circumferential shoulder 23 in the passage. When the plunger is in this position, its outer end projects beyond the outer face of the blade in which it is mounted. The plunger is normally held in outermost position by means of efspring 24, which lies within the passage and bears at one end against the plunger and at the other against a disc 25, which is inserted'in the enlarged end of the passage and is held in place by metal around the edge of the opening, which has been peened over the disc, as indicated at 26.

Thetubes, with which the mandrel is to be used, are preferablymade of a hard plastic'material, such as that known as Bakelite, and'each tube is formed witha pair of circumferential channels 27 in its inner surface. The'distance between each channel and the adjacent end of the tube is the same as the distance from the end of the plunger 2| to the opposed face of the flange P5 of the cap. When a tube is telescoped over the mandrel and moved along the latter, the edge of the tube engages the rounded end of the plunger and forces it down into the passage through the blade. The tube then passes over the top of the plunger and, when the end of the tube has seated against the flange IS, the plunger enters achannel 21 in theitube. The force of the spring is such that the plunger entering the channel holds the tube firmly against accidental displacement lengthwise of'the mandrel. V a

The new mandrel is made entirely of metal and, because of that, it is not subject to changes in dimensions as a result in variations in atmos pheric conditions. Prior rnandrels made of Wood shrink and swell as the humidity in the atmosphere varies and such changes cause the mandrels either to fit loosely within the to. es or else to bind as the tubes are mounted thereon or removed therefrom. The blades of the bar of the new mandrel are thick and rigid, so that there is little possibility of their being damaged or bent during handling, and although the cap is made of thin metal, it projects only slightly beyond the edges of the blades of the bar and is protected thereby.

The gudgeons project only a short distance beyond the ends of the bar, so that the overall length of the mandrel is only slightly greater than that of the tube. The use of the mandrel, accordingly, requires little space additional to that necessary for the tube in the winding machine.

The detent securely holds the tube in place during winding but permits ready release of the tube from the mandrel when desired. For this purpose, the mandrel with the tube thereon is placed with its gudgeon I? on a fiat surface, whereupon only little force is required to move the tube lengthwise of the mandrel to cause the plunger to ride out of the groove in the tube. Thereafter, the tube can be readily removed from the mandrel. Because of the maintenance of its dimensions, the mandrel fits snugly within the tube and provides good support for the latter during winding. Also, the spring-pressed detent is light in weight, so that its mounting within the bar does not unbalance the latter and cause vibration during rotation.

The mandrel illustrated includes three blades, but a larger number may be used if desired. Pref erably, an odd number of blades is employed since, with this arrangement, the formation of the passage in which the detent is mounted is simplified. With an odd number of blades, an

opening can be drilled through the central, part 4 of. the mandrel and through one of the blades to its. outer surface, whereas, if an even number of blades were employed, two of the blades would be aligned and this would make the formation of the passage more difficult. It would probably be undesirable to use as many as seven blades, because the weight of the mandrel would then approach that of the cylinder. Accordingly, a mandrel of three or five blades is preferred.

I claim:

l. A mandrel for supporting a core upon which a strand is to be wound, which comprises a bar of Y section, a cap at one end of the bar and of greater diameter than the cylinder described by rotation of the bar on its axis, tongues extending from the cap and lying against the legs of the bar and secured thereto, a pair of gudgeons mounted on the bar in the axis thereof at opposite ends. of the bar, Onelof the gudgeons projecting beyond the cap, and a spring-pressed detent mounted on the bar and normally extending beyond the outer face of one leg thereof.

2. A mandrel for supporting a core upon which a strand is to be wound, which comprises a bar having a solid central section and at least three like blades extending radially and axially of the central section, a pair of gudgeons seated in axial recesses at the ends of the central section, a cap attached to one end of the bar and of greater diameter than the cylinder described by the ends of the blades, when the bar is rotated on its axis, one of the gudgeons projecting through the cap, a passage extendin diametrically through the central section of the bar and through one of the blades to the outer edge thereof, a detent mounted in the passage and projecting out of the end of the passage beyond the outer edge of said blade, a spring within the passage pressing the detent outwardly, and a disc closing the other end of the passage and forming a seat for the spring.

3. A mandrel for supporting a core upon which a strand is to be wound, which comprises a bar having a solid central section and at least three like blades extending radially and axially of the central section, a pair of gudgeons seated in axial recesses at the ends of the central section, a cap attached to one end of the bar and of greater diameter than the cylinder described by the ends of the blades, when the bar is rotated on its axis, one of the gudgeons projecting through the cap, a passage extending diametrically through the central section of the bar and through one of the "blades to the outer edge thereof, the passage having a large diameter portion within the central section and a small diameter portion within said blade, a plunger having a stem and a head receivable, respectively, in the small and large diameter portions of the passage, the stem being longer than the small diameter portion of the passage, a sprin within the passage acting on the head of the plunger and urging the end of the stem out of the end of the passage beyond the outer edge of said blade, and a disc closing the other end of the passage,

4. A mandrel for supporting a core upon which a strand is to be wound, which comprises a bar having a solid central section and at least three like blades extending radially and axially of the central section, a pair of gudgeons seated in axial recesses at the ends of the central section, one of the gudgeons having a portion of large diameter in its recess and a portion of small diameter projecting out of the recess, a cap attached to one end of the bar and of greater diameter than the cylinder described by the ends of the blades, when the bar is rotated on its axis, the cap havin an opening for passage of the por- REFERENCES CITED tion of small diameter of said gudgeon and engag- Th f llowing references are of record in the ing the portion of large diameter to hold the fi f i pa nt:

gudgeon in its recess, a passage extending dla- 5 metrically through the central section of the bar UNITED STATES PATENTS and through one of the blades to the outer edge Number Name Date thereof, a detent mounted in the passage and pro- ,2 r ydberg M y 1942 jecting out of the end of the passage beyond the 2,409,742 Dougherty Oct. 22, 1946 outer edge of said blades, a spring within the 10 2,416-735 Welch a 9 passage pressing the detent outwardly, and a disc FOREIGN PATENTS closing the other end of the passage and forming a seat for the spring. Number Country Date 258,376 Great Britain Sept. 23, 1926 EARL G HILL 15 311,280 Italy Sept. 26, 1933 727,690 France Feb. 13, 1931

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