US3398907A

US3398907A - Apparatus for driving filamentary material collectors

Info

Publication number: US3398907A
Application number: US562215A
Authority: US
Inventors: Frederick G Heumann
Original assignee: Owens Corning Fiberglas Corp
Current assignee: Owens Corning
Priority date: 1966-07-01
Filing date: 1966-07-01
Publication date: 1968-08-27
Anticipated expiration: 1985-08-27
Also published as: NL6709189A; BE700725A

Description

7, 1968 F. G. HEUMANN 3,398,907

APPARATUS FOR DRIVING FILAMENTARY MATERIAL COLLECTORS Filed July 1, 1966 5 Sheets-Sheet 1 Aug. 27, 1968 HEUMANN 3,398,907

APPARATUS FOR DRIVING FILAMENTARY MATERIAL COLLECTORS Filed July 1, 1966 3 Sheets-Sheet 2 35w [a l wp 6i v w M N I 422M Eg 5?: 5 INVENTOR. 2 P J fkpzz/a HL MWA/A/ 1g. 16% B f7 I I v ATOZNEYS Aug. 27, 1968 F. G. HEUMANN 3,398,907

APPARATUS FOR DRIVING FILAMENTARY MATERIAL COLLECTORS Filed July 1, 1966 s Sheets-Sheet :5

i; 95 av I NVE N TOR fmmawck 6 U/WAA/A/ ATTORNEYS United States Patent 3,398,907 APPARATUS FOR DRIVING FILAMENTARY MATERIAL COLLECTORS Frederick G. Heumann, Toledo, Ohio, assignor to Owens- Corning Fiberglas Corporation, a corporation of Delaware Filed July 1, 1966, Ser. No. 562,215 13 Claims. (Cl. 242-46.4)

ABSTRACT OF THE DISCLOSURE The disclosure embraces an adapter construction for use on a drive spindle of a bobbin winder or twister machine wherein the adapter means includes a body fashioned with flexible peripheral sections and resilient means biasing the sections into frictional engagement with the bobbin, the adapted means including a component carried by the spindle adjacent the base of a bobbin and engageable with ribs on the bobbin providing a positive drive connection for the bobbin.

This invention relates to an apparatus for driving collectors or bobbins for winding, processing or packaging filamentary materials and more especially to a means for establishing a drive for bobbins mounted on rotatable spindles of apparatus such as a twister machine employed in processing, collecting or packaging strands or yarns and particularly strands or yarns of glass fibers or filaments.

I is conventional practice in the textile field in the opeartion of bobbin winders or twister machines to removably mount the bobbins or collectors on rotatable spindles which are driven at high speeds, the twister machines usually embodying a large number of spindles mounted upon one or more vertically reciprocable bolster rails and the spindles driven from a common drive arrangement. The bobbins, spools or collectors are of generally hollow cylindrical or tubular shape having comparatively thin walls, the bobbins being adapted to be telescoped onto driving spindles of a twister apparatus.

Heretofore the means for mounting a bobbin on a spindle and establishing a drive between the spindle and a bobbin has not been entirely satisfactory. The mounting means should be of a character which will facilitate easy removal of a strand or yarn filled bobbin and replacement with an empty bobbin and which will resist vibration of the bobbin at high speed. Vibration impairs the collection of a strand or yarn and is a common cause of breakage of the strand or yarn during winding.

The present invention embraces an apparatus for mounting a bobbin upon a spindle through adapter means and the establishment of a drive connection for the bobbin which maintains the bobbin concentric with the axis of rotation and wherein centrifugal forces have no appreciable effect on the drive connection for the bobbin thus assuring a nonslipping drive at all speeds of the bobbin and drive spindle with a minimum of vibration.

An object of the invention resides in an adapter arrangement or means carried by and locked to a drive spindle or blade and configurated to establish a drive with a bobbin or collector which will maintain concentricity of the bobbin or collector with the spindle at all speeds of rotation and which is of a character facilitating easy removal of a filled bobbin and replacement with an empty bobbin.

Another object of the invention resides in a mounting construction for a bobbin including adapter means to assure concentricity of the bobbin with the axis of rotation at all winding speeds, the adapter means including a component adjacent the base of a bobbin providing a nonslipping drive connection between the bobbin and the drive spindle.

3,398,907 Patented Aug. 27, 1968 Another object of the invention resides in an adapter means equipped with circumferentially-spaced flexible segments or sections in combination with resilient means for biasing the segments into frictional engagement with a bobbin providing an arrangement which is effective to maintain the bobbin in concentric relation with the axis of rotation at all speeds of rotation.

Another object of the invention resides in an adapter combination having a component carried by the spindle adjacent the base of a bobbin equipped with means engageable with the bobbin providing a positive drive connection for the bobbin.

Another object of the invention resides in a component of an adapter arrangement disposed adjacent the flanged end of a bobbin and having a region contiguous with the flange of a bobbin to minimize air turbulence set up by rotation whereby to substantially reduce the amount of power needed to rotate the spindle.

Further objects and advantages are within the scope of this invention such as relate to the arrangement, operation and function of the related elements of the structure, to various details of construction and to combinations of parts, elements per se, and to economies of manufacture and numerus other features as will be apparent from a consideration of the specification and drawing of a form of the invention, which may be preferred, in which:

FIGURE 1 is an isometric view of a portion of a textile strand or yarn twisting apparatus with which the bobbin mounting and driving method and arrangement of the invention have particular utility;

FIGURE 2 is a vertical sectional view illustrating one form of bobbin mounting and drive arrangement of the invention;

FIGURE 3 is an isometric view ilustrating bobbin mounting adapter components is disassembled relation;

FIGURE 4 is a detail sectional View taken substantially on the line 4-4 of FIGURE 2;

FIGURE 5 is a bottom plan view of the flanged end of a bobbin;

FIGURE 6 is a fragmentary sectional view taken substantially on the line 6-6 of FIGURE 5;

FIGURE 7 is aplan view of a lower component of the bobbin mounting construction;

FIGURE '8 is a sectional view taken substantially on the line 8-8 of FIGURE 7, and

FIGURE 9 is a fragmentary detail view of a bobbin mounting and driving component illustrating a modified construction.

Referring to the drawings in detail and initially to FIGURE 1, there is illustrated a conventional type of twister machine or bobbin winding apparatus 10 for packaging or processing filamentary materials. The winding apparatus comprises a frame structure which includes two spaced end frames or housings 12, one at each end of the apparatus, one of the end frames or housings being illustrated in FIGURE 1. The housing or frame components are connected by bolster rails 14, one of which is illustrated in FIGURE 1 and by a creel frame 16 adapted to support supply pack-ages of filamentary materials,

The housings 12 are connected by other conventional frame or structural members (not shown). The creel structure 16 is equipped with supports on mandrels (not shown), each mandrel being arranged to support a supply package 20 of textile strand, yarn or filamentary material 22 to be twisted, packaged or processed by the apparatus. A bolster rail 14 is arranged at each side of the apparatus, each bolster rail supporting a plurality of spindle mounting units 24, one of which is illustrated in detail in FIG- URE 2.

As shown in FIGURE 2, each spindle mounting unit 24 includes a tubular bracket or member 26 carried by and secured to the bolster rail 14. Disposed within the tubular bracket 26 are spaced antifriction bearing means 28 and 30 which, in the embodiment illustrated, are conventional ball bearing constructions.

A bobbin drive shaft or spindle 32 is fashioned with a portion 34 of reduced diameter journally supported by the bearing means 28 and 30. The portion 34 of the shaft 32 is secured in assembled relation with the bearing means by a nut 36 threaded onto a tenon 37 of the portion 34, as shown in FIGURE 2.

Mounted on the shaft or a spindle 32 is a whorl 38 adapted to be engaged by an endless driving belt or tape 40 for rotating the spindle or shaft 32. The driving belt 40 is adapted to rotate all of the spindles carried by the bolster rail 14 through engagement with the whorls 38 of the spindles. Each whorl 38 is secured to the shaft 32 by setscrews 42. As shown in FIGURE 1, idler rolls 44 are disposed adjacent each whorl and are adjustable by conventional means (not shown) for guiding the driving belt toward or away from each whorl to selectively establish or interrupt a drive connection to each spindle.

As shown in FIGURE 1 the driving belt 40 extends lengthwise of the apparatus and is engaged with a drive pulley 46 mounted upon a shaft 48 driven by an electrical- 1y energizable motor 50 through power transmission gearing of conventional construction contained within a housing 52 supported adjacent the housing of the motor 50. The motor 50 is mounted upon a supplemental frame 54.

The twister apparatus includes conventional ring rails 56, one of which is shown in FIGURE 1, a second rail (not shown) being at the opposite side of the apparatus.

Each ring rail 56 is mounted for reciprocation in a vertical direction and is reciprocated by a conventional means (not shown) driven by the motor 50. Each ring rail is fashioned with circular openings 58 to accommodate the spindles 32 and the bobbins carried by the spindles. Each circular opening 58 is defined by a circular track 60 on which is mounted a traveler or fiyer 62 which is freely movable on the track for rotation around a spindle and bobbin, each strand or yarn 22 being threaded through a flyer in the well known conventional manner.

The twister apparatus 10 includes yarn or strand feed roll units 64 of conventional construction. The strand or yarn feed rolls 66 of each unit are driven from a shaft 68 rotated by a belt 70 driven by power transmission mechanism contained in a housing 72, the power transmission mechanism being driven by a belt 74 and pulleys 76 and 77 from the power transmission mechanism contained in the housing 52. Each of the strand or yarn feed units 64 is of the conventional type for automatically interrupting the feed of a strand or yarn in the event of strand or yarn breakage.

The invention embraces a novel method and means of mounting a bobbin or collector 80 through adapter components whereby each bobbin is rotated for collecting strand or yarn 22 thereon. The bobbin 80 illustrated in FIGURE 2 is preferably formed of molded resinous material or plastic of substantially rigid character, the bobbin having a tubular thin-walled portion 82. As shown in FIG- URES 2, 5 and 6 the lower end of the tubular portion 82 is fashioned with an integral laterally extending circular plate-like flange portion 84.

The plate or planar portion 84 is comparatively thinwalled and is fashioned at its periphery with a. thin-walled depending circular flange 86 having notched regions 88 providing slots to accommodate a thread or yarn. The thread slots 88 are preferably diametrically opposed as shown in FIGURE 5 to provide dynamic balance for the bobbin. The planar surface of the circular flange 84 provides an abutment for strand or yarn wound upon the bobbin. The bobbin is fashioned with a tubular extension 90. A plurality of radially arranged ribs or webs 91 are integrally molded or joined with the flange 84, the peripheral portion 86 and the tubular extension 90.

The exterior surface of the cylindrical portion 82 of the bobbin is of circular cylindrical shape, and the inner surface 92 is provided with a slight taper throughout its length with the smaller diameter at the upper end. The slight taper or draft is necessary in molding the bobbin of resinous material to enable the removal of the bobbin from the dies.

The bobbin or collector is mounted for rotation with the shaft or spindle 32 through the medium of adapter or

bobbin mounting components

96 and 98, the adapter component 98 being disposed on the spindle adjacent the flanged end of the bobbin while the adapter component or unit 96 is preferably disposed adjacent an upper region of the spindle and bobbin. The drive for the bobbin is estableshed through the mounting component 98 in a manner hereinafter described, and the mounting component 96 maintains the tubular portion of the bobbin concentric about the axis of rotation of the shaft or spindle 32.

The adapter means 96 is inclusive of several components cooperating in a manner to resiliently and frictionally maintain the cylindrical portion 82 of the bobbin concentric with the axis of the spindle 32. The adapter 96 is inclusive of a sleeve or bushing 100 preferably fashioned of metal, the bushing including a flange or abutment 102 at the upper end, a circular cylindrical portion 104, and a second cylindrical portion or extension 106 of lesser diameter than the portion 104. The interior bore 108 of the sleeve 100 is of a dimension to slidably yet snugly fit onto the spindle or shaft 32, the sleeve occupying the position illustrated in FIGURE 2.

The flange portion 102 of the sleeve or bushing 100 is provided with a transverse threaded bore accommodating a setscrew 110 which is drawn up into contact with the shaft 32 to fixedly secure the sleeve or bushing on the shaft. Mounted upon the portion 104 of the sleeve or bushing 100 is a member or body 112 preferably of molded resinous material such as nylon (polyamide), Delrin (polyoxymethylene) or other suitable material. The member or body 112 may be snugly fitted onto the cylindrical portion 100 or may be molded on the sleeve.

The upper end of the body or member 112 abuts the ledge 114 provided by the flange 102 to properly position the member 112 against endwise movement in the direction of the flange 102. The member 112 is fashioned with a skirt portion 116 which is subdivided into segmental sections or petals 118 by lengthwise arranged slots 120 provided in the skirt portion. The body 112 may be fashioned of aluminum or other material which will provide a degree of flexibility for the segmental sections 118.

The segmental sections of the skirt portion 116 provide cylindrical or curved surface areas adapted to engage the interior surface 92 of the bobbin, the sections being integrally joined with the body 112 through frusto-conical shaped regions 122.

Through the provision of the slots 120 providing the petals or sections 118, the petals are endowed with a de gree of flexibility and are of a dimension whereby they are flexed inwardly by the cylindrical portion 82 of the bobbin when the latter is telescoped over the petals 118. The adapter component 96 embodies means for resiliently urging or biasing the petals or segmental sections 118 normally outwardly. Snugly yet slidably mounted on the cylindrical portion 106 of the sleeve 100 is a relatively movable collar or annular member 124.

The annular member 124 is fashioned with an annular chamber or circular recess 126 which accommodates an expansive coil spring 128. An abutment, such as an annular member 130, surrounds the portion 106 of the sleeve 100 and is engaged by one end of the spring 128. The portion 106 of the sleeve is fashioned with a peripheral groove 132 which receives a retaining element or snap ring 134 to position the abutment on the sleeve. The upper region of the member or collar 124 is fashioned with a frusto-conically shaped surface 136 which is in engagement with the terminal regions of the petals or segmental sections 118, as shown in FIGURE 2.

From FIGURE 2 it will be apparent that the expansive coil spring 128 biases or urges the collar or member 124 upwardly whereby the frusto-conically shaped surface 136 engages and biases the flexible segmental sections 118 outwardly to frictionally engage the cylindrical wall 82 of the bobbin 80. Through this arrangement the bobbin is resiliently retained in concentric condition with the axis of the shaft or spindle 32 at all speeds of rotation of the bobbin and spindle.

The juncture of portion 104 of the sleeve 100 with the portion 106 provides a ledge 140. When a bobbin or collar 80 is telescoped over the adapter means 96, the segmental sections 118 are forced inwardly and, through the medium of the frusto-conically shaped surface 136, the collar 124 is moved downwardly providing a space as shown in FIGURE 2 between the ledge 140 and the upper surface 142 of the collar 124.

When a bobbin 80 is removed from engagement with the adapter 96, the member or collar 124 is slidably moved upwardly under the influence of the spring 128 and engages the surface 142 of the collar with the ledge 140 thereby limiting the outermost position of the flexible segmental sections 118 and preventing excessive distortion or flecture of the sections.

The adapter 98 (shown in FIGURES 2, 7 and 8) for establishing a drive for the bobbin with the spindle 32 and for centering the lower region of the bobbin about the axis of the spindle is inclusive of a member or body 146 having a plate-like portion 148 of circular shape integrally joined with a hub portion 150. The adapter means 98 comprising the plate portion 148 and the hub portion 150 is preferably fashioned of metal, such as aluminum. The body 146 is provided with a central bore to accommodate the shaft or spindle 32, the bore being of a dimension whereby the body is snugly received on the shaft.

The hub portion is equipped with a setscrew 152 or other suitable means for securely fastening the body 146 to the spindle 32. The lower surface of the planar or plate portion 148 is engaged with the upper surface of the whorl 38, as shown in FIGURE 2. The plate portion 148 is fashioned with a plurality of bores in which are disposed inserts or drive pins 154. The pins may be of nylon or other rigid resinous material or may be fashioned of metal. As shown in FIGURE 7, the pairs of drive pins are diametrically arranged to secure dynamic balance under high speed rotation.

The drive pins 154 extend upwardly from the plate portion 148 of the member 146 and are adapted to engage the webs or radial ribs 91, such engagement establishing a positive drive connection between the spindle or shaft 32 and the bobbin.

The hub portion 150 is configurated or shaped to snugly yet slidably receive the lower end of the bobbin 80. 'As particularly shown in FIGURE 7, the peripheral curved surface regions 158 are of a diametrical dimension to snugly fit the interior surface 92 of the bobbin.

The hub portion 150 is provided with flattened or chordal surfaces 160, intermediate adjacent curved regions 158, as shown in FIGURE 7. By configurating the hub portion 150 with the fiat surfaces 160, a bobbin having an interior surface 92 of minimum tolerance may be telescoped onto the hub 150 as the flat surfaces or chordal regions 160 provide clearance permitting slight distortion of the bobbin as it is fitted over the hub portion 150.

The end surface 83 of the cylindrical portion 82 of the bobbin extends slightly below the peripheral edge 87 of the portion 86 of the bobbin whereby the surface 83 contacts the upper surface of the plate portion 148 of the member 146 providing a slight clearance between the upper surface of the plate portion 148 and the depending edge 87 of the bobbin portion 86. The upper region of the hub portion 150 is chamfered or beveled as at 162 to facilitate telescoping the flanged end of the bobbin over the hub portion 150.

It will be noted from FIGURE 2 that the plate portion 148 of the member 146 substantially closes the chamber or region beneath the planar or flange portion 84 of the bobbin.

This is an important feature in that high speed rotation of the webs or ribs 92 create air movement or windmill effect which would otherwise consume a substantial amount of energy in rotating the bobbin.

By substantially enclosing the region occupied by the webs or ribs 92 of the bobbin, the air movement established by rotation of the bobbin is confined within the chamber defined by the

portions

84 and 86 of the bobbin and the planar portion 148 of the adapter body 146. By isolating air movement at the ribbed portion of the bobbin, air turbulence exteriorly of the bobbin is reduced with a corresponding reduction in the fuzz level during the winding of filamentary material on the bobbin. By isolating air movement at the ribbed portion of the bobbin and thereby reducing air turbulence, the amount of energy required to rotate the bobbin is substantially reduced.

In aflixing an empty bobbin 80 upon the adapter means, the flanged end of the bobbin is engaged over the adapter means 96, the flexible segmental sections 118 being in their outermost positions under the influence of the spring 128. Engagement of the surface 92 of the bobbin with the exterior surfaces of the segmental sections 118 forces the sections inwardly. Inward movement of the sections 118 effects a downward movement of the member or collar 124 through the frusto-conically shaped surface 136 further compressing the spring 128 to an extent to permit the bobbin to be frictionally moved lengthwise of the shaft or spindle 32 to engage the inner lower region of surface 92 of the bobbin with the hub portion 150.

The bobbin is forced downwardly until the edge 83 of the wall 82 contacts the upper surface of the plate portion 148 of the adapter body 146. In this position, the inserts 154- are disposed in the path of the webs or ribs 92 which engage the inserts and thereby provide for a drive for positive rotation of the bobbin with the spindle or shaft 32.

FIGURE 9 illustrates a modification of the adapter means for the flanged end region of a bobbin. In this form the plate or planar portion 148' of the adapter 146' is fashioned with inserts 166 which are integrally cast or formed with the portion 148'. The adapter means 146 is preferably made of metal such as aluminum or the like.

It is apparent that, within the scope of the invention, modifications and different arrangements may be made other than as herein disclosed, and the present disclosure is illustrative merely, the invention comprehending all variations thereof.

I claim:

1. Apparatus for packaging filamentary material on a twister machine including a support, a rotatable member journally mounted by the support, said rotatable member being adapted to accommodate a removable collector upon which filamentary material is to be wound, means mounted by the rotatable member engageable with an end region of the removable collector establishing a drive connection for the collector, adapter means disposed between the rotatable member and the collector, said adapter means including a body having integral peripherally arranged flexible sections engageable with the collector, and means having a frusto-conically shaped surface engaging the flexible sections biasing the sections to engage the collector.

2. Apparatus for packaging filamentary material on a twister machine including a support, a rotatable spindle ournally mounted by the support, said rotatable spindle being adapted to accommodate a removable bobbin upon which filamentary material is to be wound, means mounted by the rotatable spindle engageable with an end region of the removable bobbin establishing a drive connection for the bobbin, adapter means spaced from the drive connection disposed on the spindle between the rotatable spindle and the bobbin, said adapter means including an element having integral distortable segmental sections engageable with the bobbin, a relatively movable member engaging the segmental sections, and resilient means exerting pressure on the movable member for biasing the segmental sections to engage the bobbin for maintaining the bobbin concentric with the spindle.

3. Apparatus for mounting a filamentary material collecting bobbin on a rotatable drive spindle including, in combination, a member secured to the spindle and rotated thereby, means on said member engageable with the bobbin establishing a positive drive connection between the member and the bobbin, adapter means mounted by the spindle at a region spaced from the bobbin drive connection, said adapter means comprising a sleeve mounted on the spindle, a body element supported by the sleeve, a collar element supported by the sleeve, one of said elements having flexible peripheral portions engageable with the bobbin, one of said elements being mounted for slidable movement lengthwise of the spindle relative to the other element, and resilient means biasing one element toward the other element to exert pressure on the flexible portions outwardly of the sleeve.

4. The combination according to claim '3 including abutment means arranged to be engaged by the relatively slida'ble element to limit movement thereof and outward flexure of the flexible portions when a bobbin is out of engagement with the adapter means.

5. Apparatus for mounting a filamentary material collecting bobbin on a rotatable drive spindle including, in combination, first adapter means including a sleeve for engagement with the drive spindle, an element carried by the sleeve having segmental sections engageable with the interior surface of a bobbin, resilient means biasing the segmental sections outwardly of the axis of the sleeve, means limiting the extent of movement of the sections outwardly of the sleeve, second adapter means for engagement with the spindle including a body having a plate portion and a hub portion, means for securing the body to the drive spindle, said hub portion being of a dimension to snugly fit the interior surface of an end region of a bobbin equipped with a flange, and interengaging means on the bobbin flange and plate portion establishing a drive connection between the second adapter means and the bobbin.

6. Apparatus for mounting a flanged bobbin on a rotatable spindle including, in combination, a sleeve adapted to be mounted on the spindle, an element carried by the sleeve provided with radially distortable portions for engagement with the interior of a bobbin having a flanged end region, means biasing the distortable portions radially outwardly of the sleeve, a member for mounting on the rotatable spindle and having a hub portion. adapted to telescopingly receive the flanged end region of the bobbin, said member having a planar portion adjacent the flange of the bobbin, and means on said planar portion engageable with means on the flange of the bobbin establishing a positive drive connection between the member and the bobbin.

7. The apparatus according to claim 6 wherein the hub of the member has a plurality of circumferentially spaced curved surfaces engageable with the bobbin for centering the bobbin on the hub portion.

8. Apparatus for mounting a filamentary material collecting bobbin on a rotatable drive spindle wherein the bobbin has a flange configurated to provide an annular chamber and a plurality of radially-arranged ribs in the chamber, an adapter for mounting upon the spindle, said adapter including a sleeve, a body secured to the sleeve having peripherally arranged flexible sections engageable with the interior of the bobbin at a region spaced from the flanged end of the bobbin, resilient means biasing the flexible sections outwardly into engagement with the bobbin for centering the bobbin, a drive member for mounting on the spindle having a hub portion for telescoping en-gagement with the bobbin adajacent the flanged end thereof, projecting means carried by the drive member engageable with a radial rib of the bobbin to establish a positive drive connection therefor, said drive member having a surface adjacent the flanged end region of the bobbin for substantially enclosing the annular chamber to confine air movement incident to rotation of the radial ribs.

9. Adapter means for establishing concentricity of a bobbin with a rotatable drive spindle including, in combination, a sleeve, means for securing the sleeve on a drive spindle, an element carried by the sleeve having flexible integral segmental sections engageable with the interior surface of the bobbin, a collar slidably mounted on the sleeve engageable with the sections, an abutment mounted on the sleeve, and resilient means engaging the abutment and the collar for biasing the sections outwardly of the sleeve.

10. The combination according to claim 9 including means on the sleeve adapted to be engaged by the collar for limiting the outward movement of the sections.

11. Adapter means for a twister spindle including, in combination, a sleeve, a body of resinous material mounted by the sleeve, said body having a skirt portion fashioned with a plurality of integral distortable sections for engagement with a bobbin, a collar slidably mounted on the sleeve engageable with the distortable sections, an abutment mounted on the sleeve, resilient means engaging the abutment and the collar for exerting pressure on the sections outwardly of the sleeve, and means engageable with the collar for limiting the distortion of the sections outwardly of the sleeve.

12. Adapter means for mounting a bobbin upon a spindle including, -in combination, a sleeve, a body carried by the sleeve and having integral peripherally-spaced outwardly-extending flexible portions, a collar slidably mounted on the sleeve and having a frusto-conically shaped surface engageable with the outwardly extending portions of the body, an abutment carried by the sleeve, means engaging the abutment and the collar biasing the collar in a direction whereby the frusto-conically shaped surface thereof exerts pressure on said peripherally spaced portions outwardly of the axis of the sleeve, and stop means on the sleeve for limiting slidable movement of the collar on the sleeve to thereby limit outward flexure of the peripheral portions.

13. The combination according to claim 12 wherein the body carried by the sleeve is of nonmetallic material, and the collar biasing means is a coil spring.

References Cited UNITED STATES PATENTS 893,760 7/ 1903 Thompson 242-466 1,075,461 10/1913 Chapman 242-466 1,779,099 10/1930 Magrath 242-466 2,746,689 5/1956 Berkepeis 242-463 3,038,675 6/1962 Jost 242-464 3,101,911 8/1963 Carroll et al 242-466 3,306,543 2/1967 Beerli 242-466 STANLEY N. GILREATH, Primary Examiner.