USRE12934E - locke - Google Patents

Description

F. M.` LocKE.' DIE FOB FOBMING INSULATOBS. A'PPLIUATIOR FILED FE 9 0 9 1a 6: m. A d e, u m

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UNITED STATES PATENT oEEIcE.

FRED M. Loom, or vieron, NEW Yoan.

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No. 12,934. pdeann l Roiluod Letten Patent. Beilsued lApril 8, 1909.

Original No 838.727, dated December 1l, 190s, lend No. 288,975. Application lor reissue led February 80, -1907. Seal No. 38,4005.

To all whom itmay concern.' i zontal section takenon line 3 3, 2, Beit known that I, FRED MoEToN LocKE, l showing the central stem and concentric a citizen of the United States of America, flange which surrounds the same.

residing at Victor, in the county of Ontario and State of New York, have invented certain new and useful Improvements in Dies for Forming Insulators, of which the following is-a specification, reference being had to the accompanying drawings.

This invention relates to certain improvements-'iii d-ies for formino' the interior contours of hollow plastic bo( Vies and refers more particularly to the means'for forming the interior chambers and petticoats of insulators as an improvement upon my Patent'No..

716,343, December 16, 1902, in which one of the essential purposes is to provide for the escape and rentrance of air through the die durin l its entrance into or withdrawal from the p astio material. In this class of apparatiis, a die is uniformly and progressive y; advanced under a rotar motion into and out of the plastic materia in a suitable mold which forms the exterior of the insulator and in my patent referred to, I have provided thedie with a series Vof apertures for the escape and a valved inlet for the rentrance of air from and to the intervening space between the die and the 1*plastic bod but in my present invention, have soug t to simplify and at the same time increase the efficiency of the die by providing it with an annular air s ace openin centrally from the bottom of t ie deepest c amber in the die to atmosphere so that the escape and rentrance of air will be uniformly distributed over entire area or surface of the p which is' being formed.

In other words, my object is to cause the air to follow more closely along thc'sides of the forming surface or chambers of the die between such surface and the material into which the die enters, whereby theA air finds a more direct escape to prevent air holes and also allows such air to enter more directly between the die and plastic materialfor the purpose of freeing the die from any adhering matter as said die is Withdrawn therefrom.

Other objects and uses will be brought out in the following description:

In the drawin F1 ure 1' is an elevation of my improved iii; ig. 2 is a longitudinal .vertical sectional view partl in elevation of the die seenrin. Fig. v1 and a, so t e mold and insulator formed therein. Fig. is a horipi'actically the astio material posite directions some distance beyond ,the I opposite ends of the chamber -3- and flange -2- the end opposite to that upon which the threads as -5- are formed, .being provided with a socket h6- adapted to receive an suitable shaft or rotating member by whic rotary axial motion may be imparted to the die in the manner set forth in m patent revusly referred to or in any ot er suit-ab e mainer not necessary' to herein illustrate or describe. The flange -`2 is united to the extension as -7- of the stem 1 above the annular air pas 4- by twoor more radial arms 8f thereby` leavinga clear open space above the flange 2.- and annular space -4- for com munication with the chamber L3-'- through said annular space 4-'. This annular space 4- isnarrower than the adjacent transverse width of the annular chamber 3- leaving inner and outer annularshoulders -10and `1 1 at o posite sides ofthe air passage -4 to give t e desired form to the edge of the petticoat of an insulator w-12-, said air space -4- leaving a thin annular fin on the odge of said petticoat which fin may be thrown off through the air passage -4 or may 'be subsequently trimmed oli' by hand. It is now` obvious that if this die is advanced progressively and uniformly under a rotar motion into a body of plastic material whio is retained in a suitable mold -af, the threaded stem --1- will form a central threaded socket, while the flange -2-' will form an annular chamber in said plastic material leaving a etticoat of the same material formed )y tihc walls of the chamber -3- and the inold -awill forni p the exterior of the insulator, during whichl operation, the air between the contiguous faces of the die and lastic body will be forced upwardly and find ee exit through the annular passage -4-- to atmosphere. O n the other hand, when the die is uniformly and progressively Withdrawn under a reverse rotil'y motion from the plastic material, the air l readily enter through the annular passage -4 andfollow along the conti ous surface of the die and plastic material, tiireby relieving any tendency to create a vacuum which' would operate to destroysymmetry and smoothnessof the contour of the plastic material previously formed. In other words, by creating a narrow annular air space at the base of the chamber'-3-, air is allowed to est-pe and reenter at all points in the circu erence ofthe central stem -'-1- and inner circumference of the flan e -2- thereb Vassuring an even distribution of the air an a direct exit andrentrance at the base of the chamber -3- Which is the last tofill up with and is the first to recede from the plastic material during the/formation of Y the insulator or other article.

What Iclaim is: 1. In a die for forming interior contours of plastic bodies, a central stem and an annular ange surroundingsaid stem but spaced 'y apart therefrom forming an annular chamber 30 between the stern and flange, saidchamber being constricted atits base forming an annular passage vlipening to the atmos here.

2. In a die l or chambering insu ators, 'a threaded stem'haud an annular flange Z*surrounding the same but spaced apart 'therefrom forming an intervening annularV s ace terminating at its base in a constricte .annular air passage opening to vthe atmosphere. 3: In a die for chambering insulators, y a threaded stem andan annular flange 'surrounding the same and spaced apart therefrom, forming an intervening annular s ace terminating at its base in a constricte annular passage surrounding the base of the stem and opening to the atmosphere, said stem extendingin opposite directions beyond the ends of the flange and arms uniting said flange to one of the extensions of the stem.`

4. A mold for plastic material embodying two cooperating membersbetween which the plastic materialis pressed, one of said memers ha'ving an annular recess forv forming a flange on the molded article and a narrow annular passage at the bottom of said recess for permitting the passage of air.

5. A mold for forming insulators from plastic materials embodying two cooperating members between which the material is pressechone of said members having the annular recess for forming a petticoat on the insulator and a narrow annular passage at` ing an outer annular section provided with a shoulder thereon corresponding to the firstmentioned shoulder to nold the vedge of an insulatoretticoat and a narrow annular channel between saidirshoulders through which the air and a iih of plastic material narrower than the petticoat may escape.

l 7. In a mold for plastic material, a stock i having a threaded terminal, an annular member surrounding said stock intermediate its ends and s aced slightly therefrom and with an integra annular rib depending from said annular member and spaced from the threadedV portion of said stock, and a plurality of braces inte Lal with said stock and annular minbe'r an y connecting the annular member tofthe stockj"v 8. In a mold forplastic material, a stock.

having a socket at one end and threaded for a portion ofits length at the other end, an annular member surrounding said stock intermediate its ends and spaced slightly therelfrom and with an integral depending annular rib spaced fromsaid stock, and a plurality of braces s aced apart y and connecting said .stock an annular member and integral with the same.

In witness whereof I have hereunto set my hand this 7th day of February, 1907.

FRED M, LOCKE. Witnesses:

CRAs. S.. BELL, W. W. HIBBARD.

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