US2503358A - Metal-rubber dipping form - Google Patents

Description

April 11, 1950 I A, E 5|DNELL 2,503,358

METAL-RUBBERDIPPING FORM Filed Feb. 14, 1948 2 Sheets-sheaf, 1

IN VEN TOR. A 155 5 5/04 54;

Aprii M, 3950 A. E. SHDNELL 1 2,503,358

METAL-RUBBER DIFPlT-ZG FORM Filed Feb. 14, 1948 2 Sheets-Sheet 2 IN V EN TOR.

Patented Apr. 11. 1950 METAL-RUBBER DIPPING FORM Albert E. Sidnell, Akron, Ohio, assignor to Seiberling Latex Products Co., Akron, Ohio, a corporation of Ohio Application February 14, 1948, Serial No. 8,350

(Cl. 18.-f11) 8 Claims. 1

This invention relates to an improved dipping form.

In the dipping of rubber articles by immersing a form into a latex or cement of rubber, either natural or synthetic, it is customary to use a rigid form. Aluminum, glass or porcelain is usually employed. The form may be hollow or solid. Forms of other materials have been suggested including forms of rubber but the latter have proved expensive for dipping toys and the like. Rigid forms, although satisfactory for the dipping of certain objects, are not entirely satisfactory because of the breakage which runs high with forms having appendages, etc., and because of the diificulty of stripping the dipped articles from forms other than those of simple contour.

The form of this invention is made in part of a rigid material and includes at least one appendage or the like made of a flexible material. There is no danger of such an appendage becoming broken when subjected to ordinary handling; and because of its flexibility a dipped article may be stripped from a form having such an appendage with relative ease, whereas it would be difficult or impossible to strip it from a rigid form of the same contour. This will be more evident as the description proceeds. The invention will be further described in connection with the accompanying drawings in which Fig. 1 shows a form for the body of a giraffe;

Fig. 2 is a rear view of the same;

Fig. 3 is an enlarged detail of a portion of the form shown in Fig. 2; "Fig. 4 is the form for the head of the giraffe;

Fig. 5 illustrates one way of joining the head and body of the giraffe;

Fig. 6 is a side view of the finished toy;

Fig. '7 is a view of the same in section showing the interior of the finished toy;

Fig. 8 is a form for dipping a rat with a curved tail;

Fig. 9 is a View of the finished rat;

Fig. 10 is a detail of parts of a form for a rat with a straight tail;

Fig. 11 is a view of the finished rat;

Fig. 12 is a form for dipping the body of a monkey;

Fig. 13 is a form for dipping the head of the same;

Fig. 14 illustrates the finished monkey;

Fig. 15 is a form for dipping the body of a doll;

Fig. 16 is a form for dipping the head of the same;

Fi shows h ni heddq nd.

Fig. 1a illustrates the stripping of the deposit from the form shown in Fig. 15.

A part of each of the forms illustrated is made of metal or other rigid material and a part isv made of rubber or other flexible material. As latex dipping has largely superseded dipping in a rubber cement the specification will refer more particularly to latex dipping although it is un-.v

derstood that the forms of this invention can be used in any suitable dipping composition. When any of the forms is dipped in latex-or the like, a part of the rubber deposits on the rigid portion of the form and a part deposits on the In strippingthe deposit;

for example, made entirely of a rigid material.

In referring to the drawings, the invention will be described more particularly in connection with the formation of a girafielbut it is to be understood that the description referring thereto is illustrative only. The reference to the method of dipping, etc., is likewise illustrative and the.

invention is not limited thereto.

Fig. 1 shows a form for dipping the body DQI" The shank 1.

tion of a girali'e or like animal. and body 2 are made of aluminum or other rigid material. The legs 3, 4, 5 and 6 and the tail '1 are all formed of rubber. The rigid portions or.

the mold may be solid or hollow. The rubber portions will ordinarily be solid and quite flexible. although having sufficient body to retain their.

shape during dipping. Figs. 2 and 3 illustrate a rear view of the form. The rubber button ill which is molded as an integral part of the leg 6 is squeezed into the opening I I provided in the metal body portion 2. tersunk into the metal form in any suitable man ner. Usually the rubber portion of the mold be cemented to the metal portion at the interface in addition to being anchored to it by a button or like device. cementing may be used without other anchoring means and other an-,

choring means (for example such as illustrated in Fig. 10) may be used without cementing. Any suitable means for attaching the rubber to the metal may be employed.

The metal body 2 in addition to providing cavities H for the legs includes a cavity 13 for The opening II is .coun-..

insertion of a button molded into the rubber tail 1. Thus the rigid body 2 is formed integrally with the shank The legs and tail of the animal are separately formed of rubber and are united to the rigid portion of the form in any suitable manner. The shank is provided with a tapped opening |5 at the top or other suitable means for fastening it to a rack. Ordinarily, a multiplicity of such molds will be fastened to the rack for simultaneous dipping.

The latex or solution into which the form is dipped may be of any suitable composition. It contains sulfur or other curing agent. Any dipping process may be employed, such as one which involves the previous treatment of the mold with coagulant, etc.

The rack with the forms fastened to it will be dipped one or more times into the dipping composition and then will be dried and heated to cure the rubber deposit. After curing the deposit will be stripped from the form. This deposit will cover not only the rubber appendages and rigid portion 2 of the mold but will likewise come up part way over the shank In removing the deposit it is necessary to stretch the opening formed by the shank (herein called the shank opening) to the greatest distance required to remove it from the form. For example, if the form were rigid it would be necessary to stretch the shank opening in the rubber deposit sufficiently to spread it over all four legs in their extended position. By making the legs of the form of flexible material they may all be brought together during stripping and little or no stretching of the shank opening will be required in removing the deposit from the legs.

In stripping the deposit from the form it will usually be turned inside out, at least in part. The next operation, therefore, is to return it to the right-side-out condition by air pressure or otherwise. This is common practice at the present time. The neck is then trimmed to a suitable distance above the dividing line between the shank and the body.

The form 20 for the head is similarly dipped, cured and removed from the mold. Appendages such as the ears or horns may be made of rubber to reduce breakage. After curing and turning right side out, and trimming the neck to the desired length, the two deposits are united. There are several methods of doing this which are well known in the art. Fig. 5 illustrates a small block of wood 25 to which the lower part of the deposit 26 stripped from the neck is cemented. Then the portion 21 from the body of the animal is brought up over the bottom of the neck portion and the two are cemented together. This produces the completed animal 30 shown in Fig. 6. It may be colored or decorated in any suitable manner.

Before uniting the head and body portions it is often desirable to stuff the deposit so that the toy will retain its shape. Fig. 7 illustrates the body portion with the legs filled with sawdust 3| and made rigid by bamboo strips 32. Sawdust would be pretty heavy and compact for the body so kapok is often used for this purpose. Stuffing is conventional in the art and any of the usual means and methods may be employed.

Fig. 8 shows a form for dipping a rat. The body 40 and shank 4| are made of aluminum or other rigid material. The tail 42 is of flexible material such as rubber. It is fastened into the rear of the rigid body by a rubber button 43 of the type previously described.

Fig. 9 shows the finished rat. In dipping, the

latex is permitted to come up around the base of the shank 4| and after curing (and stuffing, if desired) this extension of the deposit is trimmed and finished 01f in any usual manner. A sealing plug of rubber or other suitable material will generally be employed, and this may contain a whistle. Fig. 9 illustrates the finished toy.

Fig. 10 illustrates a different method of uniting a flexible appendage to a rigid form. Th body 50 of the rat is provided with the tapped hole 5|. The rubber tail 52 is molded with the metal screw inset 53. This inset is screwed into the tapped hole 5|. Ordinarily no adhesive will be required. The rubber appendage will wear more rapidly than the rigid portion of the mold and may easily be replaced as required. Fig. 11 shows the finished rat with straight tail. If the form for such a toy were made entirely of rigid material the breakage of the tail would be quite considerable and the cost of replacement would run high.

Fig. 12 shows the form for molding the body of a monkey. It includes the shank 50 and the rigid body portion 6|. The arms 62 and 63 are of flexible material, as is the tall 64. The feet also may be made of rubber although this is not necessar if they are not spread very far apart. To reduce breakage, they may be made of flexible material regardless of their position. In stripping the deposit from this form, the legs and tail will be pressed toward the body and in removin the deposit from the tail it will straighten out. Fig. 13 shows a form 65 for the head. The head and body, after being separately formed and cured (and also stufied, if desired) will be united in any usual manner, and Fig. 14 shows the finished toy. A collar 61 may be added after uniting the head to the body to cover the line of demarkation between the two. The string 68 may be united to the collar by a ring or other suitable means.

Fig. 15 shows the form for dipping the body of a doll. It includes the shank l0 and the body portion both of which are made of aluminum or other rigid material. The arms 12 and 13 are made of flexible material. The legs likewise may be of flexible material, although this is not neces-' sary if they are not spread far apart. The head 14 is made separately and the two are united to form the finished doll shown in Fig. 17

Fig. 18 illustrates the method of stripping the,

cured deposit from the form shown in Fig. 15. The shank opening or edge of the deposit 9| is stretched as it is brought down over the body, and the flexible arm members 12 and 13 will be straightened out and pressed to the rigid body portion to minimize the stretchin of the shank opening. After the deposit has been removed the arms 72 and 13 of the form will return to their normal position shown in Fig. 15. The deposit 90 will be turned right side out, and stuffed if desired, and then united to the head.

The various illustrations are not to be considered as in any way limiting the scope of the invention. They illustrate the formation of an article as a single unit, or by separately dipping the.

parts which are later united. They illustrate means for uniting a flexible portion of a form to a rigid portion, but these are not be considered in a limiting sense as other means for uniting such parts may be employed. The invention includes any form, a portion of the surface of which is of rigid material with another portion of the surface of flexible material.

The invention is defined in the appended claims.

What I claim is:

1. A form which comprises a body portion and at least one appendage extending therefrom, for dipping into latex and the like, the appendage being formed at least in part of flexible rubbery material and said body portion being formed of metal, the flexible rubbery material being fastened to said metal so that the rubbery material and metal are exposed for contact with the latex and the like during the dipping operation.

2. A form for dipping into latex and the like, the form being for a part of the body of an animal and its tail, at least most of said tail being made of flexible material and removably fastened to the body part which is made of rigid non-rubbery material.

3. A form for dipping into latex and the like, the form being for a part of the body of an animal with a curved tail, at least the curved portion of said tail being made of flexible rubbery material and at least a portion of the body part being made of metal, said rubbery material being fastened to the metal portion of the form.

4. A form for dipping into latex and the like, the form being for at least a part of an animal with a leg extending from a body portion, at least most of the body portion being made of metal,

and at least a portion of the leg being made of flexibl rubbery material and removably fastened to the metal portion of the form.

5. A form for dipping into latex and the like, the form being for at least a part of an animal with an arm extending therefrom, at least a portion of the form being made of metal, at least a portion of the arm being made of flexible rubbery material and being removably fastened to said metal.

6. A form which comprises a body portion and at least one appendage extending therefrom, for dipping into latex and the like, the appendage being formed at least in part of flexible rubbery material and said body portion being formed of metal, the flexible rubbery material being removably fastened to the metal so that the rubbery material and the metal are exposed for contact with the latex and the like during the dipping operation.

7. A form which comprises a body portion and at least one appendage extending therefrom, for dipping into latex and the like, the appendage being formed at least in part of flexible rubbery material and said body portion being formed of rigid non-rubbery material, the flexible rubbery material being fastened to the non-rubbery material so that both the rubbery material and the non-rubbery material are exposed for contact with the latex and the like during the dipping operation.

8. A form which comprises a body portion and at least one appendage extending therefrom, for dipping into latex and the like, the appendage being formed at least in part of flexible rubbery material, and said body portion being formed of rigid non-rubbery material, the flexible rubbery material being removably fastened to the nonrubbery material so that both the-rubbery material and the non-rubbery material are exposed for contact with the latex and the like during the dipping operation.

ALBERT E. SIDNELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date Re. 21,094 Brating May 23, 1939 791,774 Gregory June 6, 1905 1,994,317 Linscott Mar. 12, 1935 2,053,371 Lee Sept. 8, 1936 2,238,833 Tillotson Apr. 15, 1941 2,389,009 Tillotson Nov. 13, 1945 FOREIGN PATENTS Number Country Date 345,770 Great Britain Aug. 6, 1931

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