US2221135A - Method and form for making dress shields - Google Patents

Description

Nov. 12, 1940. M.' E. HANSEN 2,221,135

METHOD AND FORM FOR MAKING DRESS SHIELDS Filed July 9, 1936 Patented Nov; 12, 1940 UNiTED STATES METHOD FORM FOR MAKING DRESS SHIELDS Merrill E. Hansen, Akron, Ohio, assignor to American Anode -Inc.,

tion of Delaware Akron, Ohio, at corpora- Application July 9, 1936, Serial No. 89,857

I 6 Claims. This invention relates to the manufacture of dress shields which usually comprise arubber element known in the trade as a dress shield plate and consisting of two crescentiform flaps joined along their concave margins, arranged within a textile fabric covering, and has for. its principal objects the provision of economical and efficient procedure for making the rubber plates of dress shields in one-piece seamless fashion providing a superior and more effective shield, and the provision of a novel deposition form especially adapted for use in the rapid and efiicient manufacture of such rubber dress shield plates directly from a liquid dispersion of rubber. Other objects will be evident from the following description of the invention in which reference will be had to the accompanying drawing of which:

Fig. 1 is a sectional elevation showing the form of the present invention being dipped into a liquid dispersion of rubber;

Fig. 2 is a vertical section taken on line 2 2 of Fig. 1; l

Fig. 3 is a perspective view illustrating a subsequent step in the manufacture of the dress, shield Plate; and v Fig. 4 is a perspective view, partially broken away for clarity of illustration, showing a finished dress shield embodying the product'of the present invention.

In the present invention, I utilize a generally planar deposition form or mold ID of any suitable, preferably rigid, material such as wood, glass,

In a preferred procedure, the form 10, desirably made of a metal such as aluminum, is dipped into an aqueous liquid dispersion of rubber such as a suitably compounded liquid rubber latex l4, and an enveloping coating of latex rubber l5, preferably about 0.005" thick (when finished) is deposited over the form I!) up just to the lower end of the handle II. The depositionof latex rubber upon the form may be effected by simply dipping the form one or more times into the latex, either with or without prior intermediate applications of heat, or coagulants, or other latex-agglomerating materials to the form or to the deposited rubber, or with the aid of suction 5.. if a porous form be used, or by electro-phoretic means, or in other manners.

For consistently producing highly uniform rubber deposits and for securing generally supe rior quality and efficiency in manufacture, I pre- 10 fer, however, to'effect the deposition by a process of the character described in U. S. Patent No. 1,908,719 granted May 16, 1933, to Edward. A. Willson, in which the deposition form is coated with a volatile solvent solution of a latex coagu- 15:.

After the rubber deposit has acquired a self- 25.-

sustaining consistency as a result of treatment with coagulants or drying or both, and preferably after the deposit'is substantially completely dried, the rubber is severed along the sharp edge [3 as illustratedin Fig. 3 by pressing a suitable 30.

instrument [6 against the ordinarily somewhat thinner rubber overlying the sharp edge. For added efficiency insevering the rubber, such instrument conveniently may be electrically heated to a temperature approaching dull red heat, and 35 desirably should include a cutting point I! or knife edge for use in cutting any rubber which may have been deposited across the supporting. handle I I. The severed rubber deposit may next be removed from the form, dusted with soap- 40 stone to prevent adhesion between the two flaps, and then dried, if further drying be necessary, and vulcanized in the usual manner.

Finally, the finished rubber plate I5 is preferably although not necessarily associated with 45 and sewed into an enveloping textile covering formed of four crescentiform fabric pieces l8, l8 stitched together along their edges in the manner heretofore practiced in dress-shield manufacture to produce the final shield illustrated 50 in Fig. 4. 1

The simplicity and effectiveness of the procedure herein described makes possible the chicient manufacture of rubber dress-shield plates with minimum waste of material and low cost, 5;;

' while a dress shield embodying the rubber plate produced in the present invention is especially safe and reliable as the one-piece seamless structure of the plate eliminates any possibility of leakage which frequently has occurred in prior plates usually having a cut-seam along the armpit line of joinder between two separately formed rubber flaps. The spaced-apart relation of the flaps and the curved line of joinder between the flaps provide for fitting the shield snugly and without buckling or wrinkling over the anmpit of a dress. The free edges of the two flaps are clean cut and free from planar curvature thereby avoiding any tendency to curling, while the high quality and general resistance of tough unmasticated latex rubber deposited in final form directly from latex permits repeated washing and rough usage of the shield without substantial injury to the rubber plate.

The term liquid dispersion of rubber as used in the specification and claims is intended to include all fiowable dispersions of rubber and analogous natural or synthetic products in liquid vehicles, including dispersionsof rubber in volatile organic solvents such as the so-called rubber cements, as well as natural or artificially prepared aqueous dispersions of rubber. All such liquid dispersions of rubber may contain any desirable compounding, vulcanizing, stabilizing, thickening, thinning or other conditioning agents, and may be diluted, thickened, thinned, vulcanized or otherwise preliminarily treated according to known procedures.

The principles of the invention herein set forth may be utilized in manufacturing articles other than dress shields, and numerous modifications and variations in the procedure, apparatus, and materials as described may be made without departing from the spirit and scope of the invention as defined by the appended claims.

I claim:

1. The method of making a seamless rubber dress-shield plate which comprises providing a generally planar deposition form having a concavo-convex crescentiform outline corresponding to the desired dress-shield plate and having a relatively sharp edge along its convex margin, coating the deposition form with a liquid rubber composition, solidifying the composition to produce an enveloping coating of rubber upon the form, and slitting the rubber along the convex margin by pressing the rubber against the said relatively sharp edge.

2. The method of making a seamless rubber dress-shield plate which comprises providing a generally planar deposition form having a concavo-convex crescentiform outline corresponding to the desired dress-shield plate and having a relatively sharp edge along its convex margin, coating the deposition form with a liquid rubber composition, solidifying the composition to produce an enveloping coating of rubber upon the form, and slitting the rubber along the convex margin by pressing the rubber against the said relatively sharp edge with a heated instrument.

3. A dipping form of the character described comprising a generally planar body of substantially rigid material having a concavo-convex outline, the said body being relatively thick at the concave margin and tapering gradually to a substantially sharp edge at the convex margin.

4. A dipping form of the character described comprising a generally planar body of substantially rigid material having a concavo-convex outline, the concave margin being transversely rounded and the convex margin being relatively sharp.

5. A dipping form of the character described comprising a generally planar body of substantially rigid material having a concave-convex orescentiform outline, the form being transversely rounded and relatively thick at the concave margin tapering to a thinner and relatively sharp edge at the convex margin, and a supporting handle extending from the convex margin in the plane of the form body.

6. A dipping form comprising a relatively thin body of substantially rigid material having a concavo-convex crescentiform outline including a regularly curved concave margin and regularly curved convex margin extending from one extremity of the concave margin to the other extremity of the concave margin, the formedge along substantially the entire length of one of said margins presenting an anvil surface adapted to cooperate pressurely with an instrument to efiect severance of rubber deposited over the surface, and supporting means extending from the margin presenting the anvil surface.

MERRILL E. HANSEN.

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