US1473857A - Mold - Google Patents

Description

l Patented Non. i3, i923.

` arena clerics.

WILLARD H. KEMPTON, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR T WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VARIA.

MOLD. y y Applicationiiled October 8, 1918. Serial No.'257,389.

To all tchomlz't may concern.' v

Be it known that I, WILL/inn H. KnMr'roN,

a citizen of the United States, and a resident of Wilkinsbur in the county of Alleghenyl 6 and State ofennsylvania, have invented a new and useful Improvement inMolds, of which the following is a specification;

My invention relates to molds and lmore partlcularly `to molds for use in the manufacture of bodies formed of superimposed sheets of fibrous material impregnated with a binder and it has for its primary object the provision of a mold of such character thatall possibility of any pinching oii of the material being molded or flow of such material between the mold sections,`such as would prevent their proper closing, is prevented.

A further object of my invention is to provide a mold which is simple in construction and which may beeasily assembled and disassembled to promote rapid molding. E

Another object which I have in view re,

- plete closing of the article is insured. -With these and other objects in view, my invention will be more fully described, illust-rated in thel drawings, in the several views of which corresponding numerals indicate like parts, and then particularly pointed out in the claims. 60 ig. l is a horizontal sectional view taken on the line I-I of Fig. 3; Fig. 2 is aver tical sectional view taken on t-he line lll-Il of Fig. l, showing, partially in section and partially in elevation, the article being molded; Fig. 3 is a'view corresponding to Fig. 2 but taken on the line III-III of Fig. 1,. that is, in a plane 'at right angles to that-of Fig. 2. y n

' My improved mold comprises a mold body l, a pair of liners 2, and co-operating forming members or splits 3, a second pair of liners 4 and additional co-operating forming members or splits 5.

The moldbody l is tubular and preferably mold sections about the 'zo T sides in constructing a mold comprising a plurality of-forming members adapted to be arranged .about the article to be molded and to then be forced intothe body of the mold to thereby compress'the article.

In this connection, another object of my invention consists in so arranging the mold body and forming members that all of the forming members will move into the mold rectangular in cross section, being open at` its ends and formed centrally of two of its opposite side walls with longitudinally-ex tending channels 6. The channels 6 receive 4 the liners 4 which are of substantially wedge-shape. As best shown in Fig. 3 -of the drawings, the liners 4 are somewhat shorter than the height of the mold body and are formed, at their lower ends, with vertical faces 7 and above these faces with a pair of spaced upwardly and outwardly correspondingly inclined faces 8 separated by van intermediate vertical face 9.

Co-operating with t-he liners 4 are the forming members or splits 5 which are equal in thickness to thefwidt-h of the channels simultaneously although certain of the forming members will apply their pressure to the article being molded during the early part of their movement into the mold body while the remaining forming members will apply their pressure to the article during the latter part of their movement into the mold body. By ythis arrangement, it is pos- 6 and the liners 4 and which have their outer sible to bring the first-mentioned forming edges stepped to provide wedging--surfaces. members into engagement with the. latterhe wedging surfaces, in; each instance, mentioned forming members, before the comprise a pair of spaced, downwardly and .article being molded is 'completely cominwardly inclined surfaces 10 and 11 sepapressed, to provide a closed chamber in lrated by an intermediate vertical surface 12. which the article is further compressed and The upper ends of the inclined surfaces 10 from which none of the material comprisand 11 terminate slightly below the top of ing it can escape. This obviates a number the forming member so that the upper por-v of difficulties encountered in the past and tion of the forming member is vertical while insures a superior and more uniform prodits lower portion is preferably beveled, as uct, as none of the material being molded shown at 18. l can be pinched' from the article and a` comf The wedge-shaped liners 2 are coextensive with the unslotted walls of the mold body against which they are disposed andhave their inner faces stepped to provide wedge surfaces. As best shown in Fig. 2, each of these liners 2 is formed, at its lower portion, with a vertical face '14, extending through-` out somewhat less than half the height of the liner and above this with spaced, in-

clined surfaces 15 and 16 separated by an intermediate vertical surfacev 17. The surfaces 15 and 16 are formed at the same inclination, and the surface 16 extends to the top ofthe liner.

(lo-.operating with the liners 2 are thel forming members or splits 3. rEach of the forming members is provided, intermediate its length, with an inclined surface 18 and, at its lower end, with a second inclined surface 19, these two being separated byV an intermediate vertical surface 20, while the `forming member above the surface 15 is vertical, as shown at 21.

'lhe liners and forming members are so e proportioned that they may be positioned `in the mold body in .the manner clearly shown in the drawings, and the inner faces of the 'forming members are recessed so that, in assembled position, they provide a' chamber of the size andshape of the product to be formed inl the mold. In the present instance, I have illustrated a mold adapted for employment in the manufacture of strain insulators of a certain type'but it willV be appreciated that molds embodying the same principle may be effectively em- L lployed forv molding articles of various length and each section be utilized in, constructing a strain insulator.I lVhen forming a strain insulator, a vrod or block 22 of Wood` or other suitable insulating material may be inserted in one of the tube sections, and the threaded or otherwise roughened Shanks of connector elements 23 may be inserted in the ends of the tube,- after -which the assembled rarticle is placed in a mold'an'd vcured by subjecting it to heat and pressure to compact the material .of the tube and harden its binder.

When my improved mold is employed, the liners are positioned in the mold body, the forming members are positioned about the assembled strain insulator, and the integrally with the mold body but inf;

forming members, together with the en.- closed insulator, are positioned in theupper portion of the mold body. Under these circumstances,the inclined faces 18 and 19 of the forming members 3 rest upon the inclined faces 16 and 15, respectively, of the liners 2. The forming members 5 occupy similar positions, with their inclined faces 11 occupying the positions occupied by their inclined-faces 10 in Fig. 2.

With the mold-and the article to be molde-d thus assembled, pressure is simultaneously applied in any suitable manner, as by placing the mold in a heated press, to simultaneously force the forming` members and the enclosed strain insulator into thev mold tothe position shown in the drawings.

vDuring the first part of this movement, the inclined faces 18 and 19 of the forming members 3 ride over the inclined faces 16 and 15, respectively, of the liners 2 so that the forming `members 3 compress the uncured tube of the strain insulator from opposite sides `and are brought into engagement `with the opposite faces of the forming membersI 5. In the meantime, there is l no movement of the forming members 5 toward each other as the vertical 'faces of the forming members 5 are riding along the inner wall of the upper portion of the channels 6 and the upper vertical facesl 9 of the liners Ll. It is, therefore', possible for the material of the tube section to bulge somewhattoward the forming members 5 as rthe forming members 3 are brought toward each other and consequently, there'will be no pinching off of material, as the forming members 3 come into engagement with the forming members 5 and nothinglto prevent such engagement of the forming members. L

During the remainder of themovement of the forming members into the mol-d, the verticalfaces of the forming members 3 ride along the vertical faces of the liners 110 2 while the inclined faces 11 and 13 of the forming members 5 ride along the inclined faces 8 of the linerse, and the forming members 3, consequently, are forced into cngagement with the tube section of the strain insulator to complete its comprcession. After heat has been applied for a sufficient length of time, the mold may be readily disassembled by knocking the forming members, together with the enclosed insulator, from the mold body when theywill immediately separate and release the insulator. I

Although the'mold, as illustrated, isvca-v pable of molding only strain insulators, it will be appreciated that anyone skilled inf. the art may suitably recess the inner facesvv of the forming members to adapt the mold for use in the manufacture of various artif cles. The liners may, obviously, be fo ed chamber, and a plurality of limitations are, therefore,

article to be molded and -members into atraen? cases the design illustrated is preferable, as it facilitates machining the inclined faces and permits the employmentof hardened liners without necessitating hardening of the entire mold body.

Furthermore, somewhat different arrangements of the inclined faces may be made, without departing from the main principle of the mold which comprises the provision of a mold in which certain of the forming members are brought to their final positions relative to each other and to the remaining forming members before the remaining forming members are forced into engagement with the article being molded. No to be imposed upon my invention other than those set forth in the claims.

I claim as' my invention:

1. A mold including a body, wedge-shaped liners disposed therein and wedge-shaped surround the co-operating with the liners to be forced toward each other as they and the surrounded article are moved into the mold, the wedge face of each liner and forming member comprising a plurality of spaced inclined surfaces.

2. A mold including a body, wedge-faced liners disposed therein and providing a chamber, and a plurality of wedge-faced forming members adapted to surround an article to be molded and to be' forced with it into the chamber, the wedge-faces of the liners and forming members being so formed forming members adapted tol relative to each other that, initially, -the forming members constltuting one set are forced toward each other while the forming members constituting a second set have no lateral movement and, subsequently, the members constituting'the first set have no lateral movement while the members constituting the lsecond set are forced toward each other.

3. A mold including a body, wedge-faced liners disposed therein to form a chamber, and a plrality of wedge-faced .forming members adapted to surround an article to be molded and to be forced with it intothe chamber, the Wedge faces of certain opposed liners and forming lmembers being a'ctiveV during the initial movement of the forming members into the chamber and, subsequently, inactive while the wedge faces of the remaining forming members ing the earlier movement of the forming the mold and ,subsequently active.

4. A mold including a tubular body substantially rectangular in cross section, formproviding ay the chamber,

are inactive dur' ing members adapted to surround an article to bemolded and 'to be forced with it into the body, means for causing a pair of opposed forming members to move toward each other during the earlier part of their movement into the body and to maintain them in uniformly spaced relation during the latter part of the movement, and means for causing the remaining forming members to maintain a uniformly spaced relation during their earlier movement intoA the body and to move toward each other during subsequent movement into the' body.

5. A mold including a body, a plurality of forming members adapted to surround an article to be molded and to be forced, with the article, into the body, means for forcing certain of the forming members into final position with respect to the article and to each other and into engagement with the remaining forming members and means for subsequently forcing the remaining forming members into final position with respect to the article.

6. A mold including means providing a chamber having its opposite walls formed, each with a series of spaced downwardly and inwardly inclined surfaces, and a plu ralityl of wedge-shaped forming members adapted to surround the article to be molded and formed with a series of inclined faces for engagement with the inclined faces of the chamber, whereby the forming members will be vforced toward each other, as they and the surrounded article are moved into the chamber.

7. A mold including means providing a chamber having its opposite walls formed, each 4with a series of spaced downwardly and inwardly inclined surfaces, and a plurality of wedgefshapedfforming members adapted to surround the article to be molded and formedwith. a series of inclined faces for engagement with the inclined faces of whereby the forming members will be forced toward each other as they and the surrounded article are moved into the chamber, the series of inclined faces of the chamber walls and forming members being such that a pair of forming members will be forced toward eac-h other during a part of the movement of the forming members into the chamber while another pair of forming members will be forced toward each other during the remainder of the movement of the forming members into the chamber.

In testimony whereof, l have hereunto subcribed my name thisl25th day of Sept., 191

f wrttaan n. Kanaren.

Images