US2401069A - Laminated bucket - Google Patents

Description

H. D. HALEY May 28, 1946.

LAMINATED BUCKET Filed March 16, 1944 lllll' 16 i1 115? 3155 3 ATTORNEY Patented May 1946 UNITED STATES PATENT OFFICE A LAMINATED BUCKET 7 Hugh 1). Haley, Drexel Hill, Pa., assignor to Amerloan Vllcose Corporation, Wilmington, Del, a corporation of Delaware I Application March 16, 1944, Serial No. 525,691

' 9Claiins. (our-1s),

This invention relates to spinning buckets such as are used in the manufacture of artificial filamentary material, or the like.

The spinning bucket which, in-the manufacture of rayon, is used for twisting the fibers and coiling them in the form of a cake as they come from the setting medium, is provided with a cover ledge and a groove for a cover-retaining ring, the provision of which necessitates the removal of some material from the'bucket. To compensate for such removal of material, it is necessary to build up the outside diameter of the bucket at its upper rim. Such displacement of the material at of the bucket wall results in the rim being sub- Ject to greater centrifugal force, and therefore to greater stresses and strains, than th rest of the bucket.

Under such excessive centrifugal force the rim the rim outwardly with respect to the remainder at the top and undue stress is exerted on the filamentary material at that point.

It has been suggested to reinforce the rim of spinning buckets by placing a steel band thereabout. Such metallic reinforcements do not adhere to the rim when the bucket is rotated at high speeds, but tend to separate or work loose therefrom. The reinforcement afforded the rim by such means is therefore merely temporary.

Buckets having wire windings imbedded inor wrapped about'the outside surface of the side walls thereof have also been suggested but in that case as well the wire windings work loose from the buckets under conditions of use commonly encountered in spinning artificial filamentary material, that is, high speeds of rotation and, furthermore, do not reinforce the bucket at its most critical point, which is the upper peripheral edge or rim. Such buckets have the additional disadvantages that the provision ofthe wire windings about the outside surface'thereof necessitates the machining of grooves therein be covered with a protective wrapping of lamihated cloth, in order to shield them against acid attack, and thus the initial cost of the buckets is rendered unduly high and, since the wire windings increase the weight of the bucket, increased power is required for high speed rotation thereof. Buckets consisting entirely of resin-impregnated laminated fabric, and which are naturally more resistant to cracking or breaking, are not unknown, but the costs involved in producing such buckets are comparatively exorbitant and prohibit the adoption thereof for use on a large scale. v

I have now found that it is unnecessary to depend upon the substantially ineffective expedient of providing any part of the spinning bucket with metallic reinforcements or to resort to theme of laminated material for the entire bucket structure, in order to provide a bucket which is capable of being, rotated at extremely high speeds for prolonged periods without breakage or deformarim about its upper peripheral edge which is molded from a. resin-impregnated laminated material/ The rim of the bucket is thus permanently and uniformly reinforced throughout its entirety and is capable of withstandingfor pra'ctically indefinite periods the stresses and strains created by the high centrifugal force to which the rim is'subjected when thebucket is in use.

The reinforced rim is also highly resistant to chipping such as may be incurred when the buckets are doffed to permit the cake of filamentary material to drop therefrom.

In addition, the costs involved in providing the bucket with the specially constructed rim portion compare favor ably with the costs 7 of manufacturing conventional molded spinning buckets and are, of course, considerably less than the costs of manufacturing buckets consisting entirely of laminated material.

In the accompanying drawing,

Figure 1 is a front elevation of a preferred embodiment of the invention; and

Figures 2 and 3'illustrate various modifications of the 'rim for a spinning bucket in accordance with the invention. 7

Referring to Figure 1, the spinning bucket comprises a'rim I. a cylindrical side wall 2, and

to accommodate the wire, and the wire must then B disposed therein, for mounting the bucket upon 2 I l a rotating shaft or spindle during use, the grooves serving to maintain the bushing in place during rotation of the bucket. Annular roove 1 for seating a retaining ring to hold the usual cover in place, and an annular shoulder 8 for seating stance cotton, wool, regenerated cellulose, cellulose derivatives, mixtures .of such fibers, or glass fibers bonded together with the aid of a phenolic consist of natural or artificial fibers, as for incresol or other resin, preferably the same resin as that used in molding the body of the bucket.

Since the annular groove I and shoulder 8 are.

provided in the main body of the bucket, provision thereof does not necessitate the waste of expensive laminated material, which is only required for the extreme peripheral rim or edge of the bucket. In the finished structure, the body portion and rim are intimately molded together to form a smooth unitary structure.

The rim portion or collar for the bucket may be preformed by first winding a resin-impregnated fibrous material upon itself to form an annulus, and then heating and pressing the material to form the 'desired shape, the pre-forming operation being carried out under such conditions that the material takes the desired shape but is not completely cured. Afte the rim has been pre-molded, the phenol-formaldehyde resin powder is placed in the mold for molding the body portion of the bucket, and the partially cured laminated rim i tapped in place over the powder in the mold, after which the two are molded until they are cured and hardened into the finished unitary spinning bucket. The body and rim portion may be molded together under heat and pressure according to. any conventional method, or they may be heated to molding temperature in a high frequency electric current and then immediately transferred to a box mold and subjected to a regular molding operation. The last-mentioned molding method has the advantage that the curing and molding cycle is greatly accelerated and lower pressures are equired.

' The rim may be of any desired shape, as shown,

it overhangs the side wall of the main body portion of the bucket and partially extends into the wall.

In the finished spinning bucket, the molded resin-impregnated laminated fabricis disposed in circles which are roughly concentric with the bucket rim, so that the rim is uniformly rein forced throughout itsentirety, and constitutes an integral part of the cylindrical side wall of the spinning bucket, to form a unitary structure of great inherent strength. The exterior and interior surfaces of the completed bucket are smooth, which is advantageous in the collection of filamentary material.

tion, the resin of the body and the resin of the rim being integrally molded together to form, a

continuous mass, and the resin only being fabricreinforced.

2. A molded spinning bucket comprising a bottom wall having an integral hub, and a substantially cylindrical side wall extending upwardly from said-bottom wall, said hub and bottom and side wall-being formed of an artificialresin, and a rim aboutthe upper peripheral edge of said side wall formed or a resin-impregnated laminated fabric disposed in circleswhich are generally concentric with the bucket rim, the resin of the side wall and the resin of the rim being integrally molded together to form a continuous mass the rim only being fabric-reinforced.

3. A molded spinning bucket comprising a. bottom wall having an integral hub, and a substantially cylindrical side wall extending, upwardly from said bottom wall, said hub and bottom and side wall being formed of an artificial resin, and a rim about the upper peripheral edge of said side wall and overhanging the latter, said rim being formed of a resin-impregnated laminated laminated fabric disposed in circles, which are generally concentric with the bucket rim, said rim being integrally molded to said 'side wall by an artificial resin, the resin of the side wall and the resin of the rim being integrally molded together to form a continuous mass the rim only being fabric-reinforced.

5. A molded spinning bucket comprising a bottom wall having an integral grooved hub and a substantially cylindrical side wall extending upwardly from said bottom wall, said hub and hottom and side wall consisting of an artificial resinous material, and a rim about the upper peripheral edge of said side Wall and overhanging and at least partially extending into said wall, consisting of a resin-impregnated laminated fabric disposed in circles which are generally concentric with the bucket rim, said rim being integrally molded to said side wall by an artificial resin, the resin of the side wall and the resin of the rim being integrally molded together to form a continuous mass the rim only being fabricreinforced.

6. A molded spinning bucket comprising a bot-- tom wall having an integral hub, and asubstan- While a preferred embodiment of the inven-' tion has been disclosed, "the description is intended to .be, illustrative only, and it is to be understood that changes and variation may be made without departing from the spirit and scope tiallycylindrical' sidewall extending upwardly from said bottom wall, said hub and bottom and side walls being formed of a phenol-formaldehyde resin, and a rim molded to the upper peripheral edge of said side wall, in intimate association therewith, said rim being formed 'of a laminated fabric impregnated with a phenol-formaldehyde resin, the resin of the side wall and the resin of the rim being integrally molded together to form a continuous mass the rim only being fabric reinforced.

7. A molded spinning bucket having a main resin of'the rim being integrally molded together to form a continuous mass the rim only being fabric-reinforced.

9. A molded spinning bucket having a; substantially cylindrical side wall of a. molded artificial formed of a laminated phenol-formaldehyde or resin, a'rim about the upper portion of the said side wall integrally molded therewith and formed of a resin-impregnated laminatedfabric disposed in circles which are generally concentric with the bucket rim, the resin of the side wall and the resin of the rim being integrally molded together to form a. continuous mass, the rim only being fabric-reinforced.

HUGH D. HALEY,

. 3 crescl formaldehyde resin impregnatedfabric disposed in circles which are generally concentric with the rim, the resin of the side wall and the t

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