US1811609A - Bobbin bushing - Google Patents

Description

June 23, 1931. E. c. BUFFlNGToN BOBBIN BUSHING Filed July 27. 1927 7 .w j 5 wm... MMVIIalll. aw 1 j L'LL 'auff accomplish the desired result but sincethe bushing is subjected to the swelling 'and Patented June 23, 1931 Unirse stars PATENT orrflcrf.Y

EDWIN C. BUFFINGTON, OF MANCHESTER, NEW HAMPSHIRE, ASSIGNOR, BY MESNE .AS-

SIGNMENTS, TO U S` BOBBIN & SHUTTLE COllPANY,

1929, OF PROVIDENCE, RHODE ISLAND', A. CORPORATION' 0F RHODE ISLAND Bonnin BUSHING Application nea .my 27,1927. serial No. 208,745.

This invention pertains to bobbins ot the kind employed in textile manufacture (for example spinning bobbins) and relates more particularly to an improved bushin g for such a bobbin. Bobbins of this type are usually made ot wood or other non-metallic material and depend upon trictional contact with at least one end of the spinning spindle to drive them. rlChe bobbin has an axial bore for the reception of a spindle, and at the central.

So long as the proper relation between the diameter of the spindle and the bobbin bore is maintained, the bobbin rotates with the spindle and oders little resistance to doffing, but since the bobbin is made of wood (which is a hygroscopic material and swells and shrinks slightly in response to atmospheric nonditions) the bore in the bobbin is not of `constant diameterand at times decreases so that the bobbin binds on the spindle and cannot be easily removed or doffed and will not set at the proper height on the spindle.

To avoid this difliculty attempts have been made to provide the bobbin with a metallic tubular bushing at its contact pointV or points with the spindle, such bushing, or bushings being of constant internal and external diameter. Theoretically such a bushing should shrinking of the bobbin, as above described, it is 'found that after a short period of use, erdinary tubular bushings become so loose that they remain upon the spindle when the bobbin is doded or drop the bobbin after the latter has been removed from the spindle.

In accordance with my present invention I provide a bushing which may readily be placed at the proper position in the, bobbin bore and `which is not loosened by the shrinking or swelling of the bobbin; which is securely anchored so that it does not turn from the bore V,in

relatively to the bobbin nor pull out when the bobbin is doffed; which provides a'bearing of proper diameter for engagement with the spindle; which is cheap andeasy to construct; and which requires no substantial change in the bobbin to adapt the latter for use with the improved bushing.

In the accompanying drawings I have illustrated apreferred embodiment of my invention together with various modifica` tions thereof, but with the understanding that those embodiments of the invention `shown are merely by way of example and are vnot to be considered as restrictive 10i the invention.

In the drawings,

Fig. l is a side elevation, partly in vertical section, of a spinning bobbin provided with my improved bushing;

Fig. 2 is a fragmentary lvertical section showing the upper part of the bobbin ot Fig. Vl, but in a plane at right angles to the plane of the section of Fig. l;

Fig. 3 is a'section to larger scale, sub- Y Fig. 6 is a side elevation showing the opposite side of the bushing from that shown in Fig. 5;

Fig 7 is a longitudinal section substantially on the line 7-'7 of Fig. 6;

Figs. 8, 9, l0, 11, l2 and 13 are side ele- .vatlons illustrating modified forms of my improved bushing;`

Fig. 14 is a fragmentary vertical section, to large scale, showing a bobbin having a bushing of the type illustrated in Fig. 13 mounted therein;

Fig. l5 is a side elevation of a further modified form oit bushing;

Fig.fl6 is a vertical section illustrating a still further modified form of bushing; and

Fig. 17 is a sectional elevation of a bobbin having a bushing of the type disclosed in Fig. 16 in place therein.

In Figs. 1, 2 and 3 the numeral 1 indicates a bobbin of usual type such as is employed in textile spinning, such bobbin having the bore 2 extending from the lower end to the upper end of the bobbin. At the point 3 this bore is abruptly reduced in diameter and at the point l the bore is again slightly reduced, that portion of the bore lying between the points el and 3 being intended to receive my improved bushing 5.

Thilo I may make my bushing from a piece of tubing, I prefer to roll it from sheet material, and in Fig. t I show a blank 5' of sheet material, for example hard sheet brass, such blank having the recess 6 in its left-hand edge and the projection or tongue 7 projecting from its right-handv edge, the tongue 7 being adapted to llt within the recess G when the blank is rolled into tubular or cylindrical form. The blank 5 is also preferably providedwith a V-shaped incision dening the substantially triangular spur 8. Either before or after the blank is rolled into tubular form, the aneX of this spur is deflected out of the plane of the blank.

In rolling the blank 5, its opposite edges are preferably brought substantially into contact but when the rollingoperation is completedthe natural resiliency of the metal tends to spring the edges apart to a slight extent so as to form the stepped gap or split 9 extending longitudinally of the bushing as shown in Fig. G. The dimensions of the blank 5f are such that when the blank has been rolled into tubular form and'when the edges of the blank have beenbrought. into contact so as substantially to close the gap 9, the bushing may be pushed endwise along the bore of the bobbin until it enters the reduced portion of the bore abovcithe point 3. To facilitate introducing the bushing into the bobbin bore, I may, if desired, when rolling the blank, give it a slightly conical form so that its upper end, that is to say the end which is in advance in thrusting it into the bobbin. bore, is of slightly smaller diameter than the opposite end. However, when this procedure is followed the opposite end of the bushing is made abnormally large and after the bushing has been seated within the cylindrical bore it straightens out or becomes substantially cylindrical so that it provides the desired cylindrical bearing for the spindle. i

As the split bushing thus provided is quite resilient and presses outwardly against the walls of the bobbin bore it tends Vto retain its position within the bobbin bore and is not readily displaced. If the bobbin shrinks, the resiliency of the bushing is such that it still retains itsclose Contact with the walls of the bobbin. On the other hand, if

the bobbin swells, the bushing is compressed until the gap 9 is completely closed, but as the bushing now forms a continuous cylinder or tube it resists further compressive stress imposed by the swelling bobbin and maintains its normal minimum internal diameter. Thus even though the bobbin swell to a considerable extent the free running fit of the bobbin with respect to the spindle is not interfered with.

While the bushing, by reason of its resiliency, tends to maintain its position within the bobbin I prefer to furnish additional means for holding it in position and to this end I provide the tongue or spur 8 above described. rihis spur normally diverges outwardly and downwardly from the upper or advancing end of the bushing and when the bushing is forced into the bobbin this spur is pressed inwardly to some extent, permitting the bushing to slide quite freely into the bore. However, this spur with its sharp point 1() presses into the wood of the bobbin and positively resists any force tending to move the bushing in the opposite direction. Thus, when the bobbin is doed, the bushing remains in position even though there should be some slight sticking of the bushing to the spindle.

Obviously,- if additional positive retaining means be required, I may provide more than one of the spurs 8 or if desired I may as indicated in Fig. 7 deflect the lower edge of the tongue 7 slightly seas to provide the shoulder 11. This outwardly projecting shoulder 11, like the divergent end 1() ofthe tongue 7, tends to diginto the wood of the bobbin and prevent accidental removal of. the bushing or rotation of the bushing relatively to the bobbin after it has once been seated in position.

While I prefer to provide the tongue 7 entering the recess 6, since this construction substantially prevents any twisting of the bushing as the latter is being forced into its seat in the bobbin, I may provide other arrangements giving substantially thesame result or I may dispense with this feature of the bushing altogether. Thus as shown in Fig. 8 the bushing 12 is provided with a gap 13 and with a recess 14 which extends inwardly from one end, andthe projection 15v at the corresponding end of the bushing is adapted to engage this recess. If desired the edge 16 of the projection 15 may be deflected outwardly to provide a retaining shoulder in the same way as the lower edge 11 of the tongue 7 above described.

In Fig. 9 `I have shown a bushing 17 having the gap or split 18and the substantially circular recess 19 having the tongue or tab 2O interlocking with the recess. While this arrangement gives a positive lock and in this respect is superior to the arrangement shown in Figs. G and 8, itlimits the expansion of the bushing to a certain extent so that under extreme conditions of moisture variation this construction may not be as desirable as that of Figs. 6 and8.

In Fig. 10 the bushing 21 is shown as provided with a gap or slit 22 extending in a curved or helical direction. While this arrangement provides the desired expansibility it does not preventl twist of the bushing as it is being introduced intothe bobbin.

In Fig. 11 I show a bushing 23 having a substantially straight uninterrupted longitudinal gap 24 which permits free cX- pansion of the bushing. This bushing is also furnished with a flared lower edge portion 25 which is adapted, after the bushing has been seated within the bobbin, to dig into the wood of the bobbin and thus positively to prevent removal of the bushing.

In Fig. 12 I have indicated a bushing v26 provided with a series of slits at its lower end forming tongues 27 which may, as indicated in dotted lines, be deflected outwardly to provide positive holding means for retaining the bushing in position.

In Fig. 13 I have shown a bushing 28 similar to that shown in Fig. 12, but having Y the tongues or tabs 29 of triangular form at its lower end. These tongues Vor tabs 29 may be deflected outwardly and by their resilient engagement with the inner surface of the bobbin bore will constitute positive holding means for retaining the bushing in position.

Instead of using the bushings 26 or 28, as above described, I may, as shown in Fig.

14, provide the bobbin 30, having the bore 31, with an internal annular recess 32 and before deflecting the tongues or tabs 27 or 29 of the bushing, I push the bushing with its tongued end in advance along the bobbin bore until the tongues or tabs are substantially opposite to the recess 32. I4 provide a shoulder 33 just above the recess 32, and `vhen the tongues or tabs engage this shoulder they will be deflected outwardly into the recess 32, such action being assisted, if necessary, by the insertion of a suitable tool into the bore of the bobbin. lVhen the tongues or tabs are thus turned outwardly into the recess 32 they constitute positive retaining means for holding the bushing in position.

In Fig. 15 I have shown a bushing 34 having two series of outwardly projecting tongues or teeth 35 and 36. By providing a. plurality of such teeth or tabs the bushing may be held very firmly in position and when I employ bushings such as shown in Figs. 12, 13, 14 and 15, I. may, if desired dispense with the longitudinal slit or gap since the outwardly flaringresilient retaining elements grip the bobbm so firmly and positively that they retain the bushing in bushing having ay cylindrical bore, I may,

when the bobbin is to be used witha conical spindle, employ a bushing such as shown in Figs. 16 and 17. This bushing37 is pref# erably made from a pieceof sheet material or blank having one edge thicker than the other and when such a piece of sheet ma- -1 Vterial or blank is rolled to make its outer surface cylindrical, its innervsurface 39 assumes a conical form. By proper selection of material I may provide an internal conical bore of the desired taper for engagement with any given spindle while at the sameV time the outer cylindrical surface of the bushing is of -proper shape and diameter to fit the cylindrical bore of the bobbin. This bushing 37 may be provided with outwardly directed tongues or spurs 40 and 41 for engagement with the bobbin, if desired, and as shown in Fig. 16 this bushing is split andfurnished with a tongueV and recess in the same way as the bushings of Figs. 6 and 7.

While I have shown certain desirable forms of bushing I do not intend thus to limit myself but reserve the right to make such changes in size, relative proportions of ,parts and arrangements of elements as may fall within the scope of the appended claims, and while I have hereinchosen to illustrate my improved bushing as applied to the upper part of the bobbin whereit engages the spindle tip, I contemplate that the improved bushing is of substantially equal utility for application to the lower and of a bobbin where it engages the lower part of the spindle, as the conditions and requirements are practically the same.

I claim:

1. A bobbin bushing comprising a longi- `:udinally split tubular body adapted to fit within the bore ot', a bobbin, said bushing having an element which is yieldable to a position substantially within the body of the bushing to permit the bushing to move axially in one direction along the bobbin bore but which tends to bite into the wall of the bore to oppose movement of the bushing in the opposite direction.

2. A bobbin bushing comprising a longitudinally split resilient tubular body adapted to fit within the bore of a bobbin, said bushing having an outwardly directed tongue which is yieldable to a position substantially within the body of the bushing to permit the bushing to move axially in one direction `along the bobbin bore but which E bobbin, the body having a longitudinal gap,` there being a recess at one edge of the gap and a tongue projecting from the other edge of the gap into said recess, one circumfer- 5 entially extending edge of the tongue juttingout from the outer surface of the body to oppose longitudinal movement of the bushing relatively to the bobbin.

4. A bobbin bushing comprising a sub- 1G stantially cylindrical body adapted to fit Within the upper part of the bore of a bobbin, said body having a tapering axial bore, the body being of resilient material and having a longitudinal gap therein, there being 15 a recess at one edge of the gap and a tongue projecting from the other edge of the gap into the recess, said body having an element normally projecting from its outer cylindrical surface and adapted to engage 2e the Wall of the bobbin bore to prevent axial movement of the bushing in one direction at least.

Signed by me at Boston, Massachusetts, this 26th day of July, 1927. 5:5 EDWIN C. BUFFINGTON.

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