US2100575A

US2100575A - Form for making rubber articles

Info

Publication number: US2100575A
Application number: US55214A
Authority: US
Inventors: Abraham N Spanel
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-12-19
Filing date: 1935-12-19
Publication date: 1937-11-30
Anticipated expiration: 1954-11-30

Description

Nov. 3o, 1937. A. Nf SPANEL 2,100,575

FORM FOR MAKING RUBBER ARTICLES Filed Dec. 19, 1935 Z'Sheets-Sheet l NOV. 30, A N SPANEL 2,100,575

FORM FOR MAKING RUBBER ARTICLES Filed Deo. 19, 1955 2 Sheets-Sheet 2 65 1N VEN TOR.

BY M

Patented Nov. 30, 1937 UNITED STATES PATENT oFFi-CE FORM FOR MAKING RUBBER ARTICLES Abraham N. Spnel, Rochester, N. Y.

Application December 19, 1935, Serial No. 55,214

13 Claims. n (CLIS- 41) This invention relates to forms for manufacturing thin rubber articles, and particularly fromy latex, and to a method of making such forms.

YIn the production of sheet rubber articles from latex it has been necessary in the past to provide it has been necessary to invest large amounts of capital in forms, the time of making of which had to be necessarily long.

It is the purpose of the present invention to provide a simple type of form'which obviates the need of casting in the making of the same but which can be manufactured from commercial sheet metal stock with a minimum amount of skill and at small cost.

The main feature of the present invention relates to a form made of sheet metal stock of desired outline and having attached thereto metal edging to develop therein a rubber article of any desired shape and with a margin reinforced by a ridge of rubber.

A further feature of the invention relates to a form having sheet metal pieces and bosses attached thereto to dene reentrant or cut-out por-v tions las well as openings in a rubber article deposited on the form.

The various features and advantages of the invention will appear from the detailed description and claims when taken with the drawings in which Fig. 1 is a front elevation of a form made according to the present invention; Fig. 2 is an enlarged vertical section, partially broken away, of the form taken substantially on the line 2 2 of Fig. l; Fig. 3 is an enlarged fragmentary sectional view of the form withpieces o-f rubber layers thereon, said section being taken on the line 3 3 of Fig. 1; Fig. 4 is a cross section of the form taken on the line 4 4 of Fig.V 1 also showing layers of rubber on the form; Fig. 5 is an enlarged fragmentary section taken on the line 5 5 of Fig. l indicating the character of the side margin of the form at which reinforced edges are generated in the garments deposited on the form; Figs. 5A, 5B, 5C and 5D are modified side margins for the form which may be substituted for that sho-wn in Fig. 5; Fig. 5E is an enlarged sectional View of the form margin illustrated in Fig. 5 also indicating the character of garment reinforcements generated at said margin; Fig. 6 illustrates a blank which is the main part of the form of Fig, 1; Figs. '7, 8 and 9 illustrate stampings which may be attached tothe faces of the blank of Fig. 6` in constructing the form shown in Fig. 1; Fig. l() is a front View of a modified form for making bibs, aprons and the like; Fig. 11 is a modified form for making sheets, table covers and the like; and Fig. 12 is a modified type of form on which a latex rubber curtain or the like can be made.

Referring to Figs. 1 to 9 inclusive of the drawings, there is illustrated a form for making rubber aprons, bibs and the like. prises a sheet metal plate 5 stamped or cut from sheet aluminum or stainless steel of any desired thickness, and having the outline best illustrated in Fig. 6. The portion of the form.- which generatesy the neck opening in the apron includes a piece 6 stamped or cut from sheet metal (see Fig. 8). One such piece is attached to each of the faces of the plate at the top thereof. These stamped out pieces are preferably fastened to the plate as by soldering and or welding so that there will be no crack between the plate and the attached pieces. The upper part of the bib-generating area of the form which is illustrated at the top of Fig. 1, terminates in abrupt edges in the surfaces of the plate 5. In order to define the margins of the form from the waist portion thereof to the neck portion of the same as well as to define'one margin of each of the form areas on which the tying strips or strings, are deposited, a pair of stamped or cut-out sheet metal pieces l, of the outline illustrated in Fig. 7, arel attached .to each surface of the plate 5 in the position shown in Fig. 1, by any suitable means such as by soldering and/or welding. The bottom portion of theform as illustrated in Fig. 1, whichportion develops the bottom of the deposited apron, has fastened to each surface thereof, a stamped or cut-out piece 9. Each piece 9 has slots therein to define hooks ID'and is attached to the portionl I of the plate 5 which has similar slots therein to define hooks I2, so that the hook portions I0 yand I2 are in registry. The several pieces are attached to the main plate in this position as by soldering and/or Welding or the like. It Will be understood that when this form is being used for making aprons, it is supported by the mentioned hook like portions.

The edges of the main plate from the corners I3 thereof to each end of the pieces 9 are bounded 'I'his form comby an edge-defining strip I4 as shown in Figs. 3, 5 and 5E. This strip is preferably made from sheet stock having a groove I5 or the like rolled or formed therein so that the sides of the groove can engage both surfaces of the plate but with the abrupt edges of the strip projecting away from the principal plane of the plate. This strip is attached to the plate by soldering or by welding, or by both, indicated at I6 (Fig. 5E) so that the junction between these two parts is free from crevices.

Each surface of the plate 5 near the neck portion thereof is provided with pairs of bosses II to define buttonholes in the deposited apron and is also provided near each side edge thereof with a boss I8 at a point near where the tying strip portion of the form meets the main surface of the form. Each of the mentioned bosses mayv terminate in an abrupt edge. By reason of the bosses I8, holes with reinforced margins are dee veloped inthe deposited apron strings at these points. Thus the end of each apron tie o-r string can be reinserted through its related opening so that the apron ties or strings which are deposited in such a direction that they tend to extend toward the neck of the apron, when inserted through the opening will project at right angles to the apron.

It will be understood that the reinforcing strip I4 can be made in various ways. As shown in Fig. 5A there is provided a bar of readily bendable stock rectangular in cross section which has a notch or kerf 20 cut in one face thereof, the width In the further modified arrangement shown inY Fig. 5C the plate 5 is made of two thin plates 5b which have their edges turnedover as indicated at 5c to provideflanges. The junction of the two plates at these two flanges is welded or filled with solder 23 by which the two plates are rrnly joined together. j

In the modification shown in Fig. 5D the main plate 5 is formed of two plates 5d' to the edge of which there is fastened a strip 24 projecting beyond each surface Aof the plate in the nature of a flange. Y

A better understanding of the structure of the form may be obtained by describing the method in which it is used to deposit two rubber aprons simultaneously. One or more of the'forms in position inverted from that shown in Fig. 1 are supported by the hooks I on a suitable rack or support (not shown); The forms in this position are then submerged one or more times into a bath of an aqueous dispersion of rubber or the like with a setting or drying interval between each dip, until a layer of rubber 25 of desired thickness is deposited on each surface of the form. At the junction between the plate and the pieces 5, 'I and 9 as well Vas at -vthe junction ofthe plate with the stripsl I4, the rubber of the layer will accumulate'as indicated at 21, while at the sharp or abrupt edges of these pieces and strips the rubber layer will develop a line of weakness therein so that the rubber on these pieces and strips can be torn away atV this line of weakness leaving the reinforced margin 21 of each layer witha torn or feather edge `23. Similarly at each o-f the bosses such as IT and I8, the rubber will accumulate in the junction between the bosses and the plate 5 to provide a reinforced margin 29 for each of the resulting holes in the layer, this margin terminating in a torn or feather edge 3B. Adjacent the lower edges of. the plate 5, the rubber will accumulate as a reinforcement 3I which is semi-oval or semi-pear shaped in cross section, while at these edges of the plate a line of weakness 32 will develop in the deposited layer so that the layer can be parted at this point. After the layer has properly set or dried on the form, the excess portion thereof on the faces Yof the pieces ii, 'I and 9 as well as on the edge strips I4 is torn away leaving two rubber aprons or bibs which can be stripped from the form.

A modified type of form 35 for making aprons, bibs and the like is shown in Fig. l0. This form comprises a plate 36 cut or stamped from sheet metal to any desired outline, for example, that shown. At each surface of this plate and at the top thereof, there is secured by soldering and/or welding, a cut-.out or stamped out plate 31 similar to piece 6 illustrated in Fig. 8. A relatively thin strip of sheet metal 3S, which is similar to the strip I4 of Fig, 5E is shaped to conform to the outline of plate 36. The edge of this plate is inserted in the groove in the strip where it is soldered and/or welded in the manner best indicated in Fig. 5E so that there are no crevices or cracks between the strip and the plate. It will be noted that the ends of the strip 33 engage the side edges of the pieces 3'I being soldered and/or welded thereto. Each face of the plate 36 is preferably provided with bosses 39, each of. which terminates in an abrupt edge similar tcthat of the bosses I'I best shown in Fig. 4. It will be understood that pieces 3l and the strip 38 de velop a reinforced margin for the apron deposited on each surface of the form while the bosses 39 develop openings therein with reinforced margins through which tie-strings or the like may be inserted.

The modified type of form 4I) shown in Fig. 11, is adapted for making rubber sheets or rubber table covers. This form comprises'a `plate 4I cut or stamped from sheet metal or like material to any desired outline such as indicated. A thin sheet metal strip 42, of the character best illus- Y posited on this form, a boss 44 -of thecharactei" indicated at Il in Fig. 4, is soldered and/ or welded ateach corner and on each surface ofthe plate.

In Fig'. 12 there is illustrated'a form 50 suitable for making rubber curtains; This form comprises a rectangular plate 5I which is out or stamped from suitable sheet metal. This plate which preferably has rounded corners is provided at its top and sides with a reinforcement-developing strip 52 of the character illustrated in l'lig.V

5E. It will be understood that the edges of the mentioned top and sides of the plate are inserted in the .groove in the strip 52 where they are fastened by soldering and/or welding. It will be noted that the ends 53 of the strip 52 terminate just short of the rounded lower corners of the plate. These lower' corners of the plate as well as the lower edge 54 thereof, maybe abrupt or may terminate in a knife edge. Where it is desired that the deposited curtains have a row of openings along one endthereof, each surface of the form near one end thereof is provided with a row of bosses 55 which terminates in an abrupt edge as indicated at i1 in Fig. 4.

It will be understood from the foregoing description that in using the forms in Figs. 1G, 11 and 12 in making the rubber articles, these forms are dipped one or more times with a drying or setting interval between each dip until a layer of the desired thickness is deposited on the form. At the junction between the

strips

38, 42 and 52 and the plates 36, 4I, and 5I, respectively, a reinforcing ridge of rubber will accumulate in the layer of. the character indicated at 2l' in Figs. 3 and 5E. At the junction between the pieces 31, the raised bosses 39, 4 and 55 and the plates 3%, il and 5l respectively reinforcing ridges of the character indicated at 21 and 29 in Fig. 4 will be developed in the layer. It will be understood that the layer adjacent the outside of the reinforcement will be torn or cut to give the desired cutline to the finished article. In the case of the article developed on the form of Fig. 12, the lower margin thereof adjacent the abrupt edge 54 will have a cross section semi-pear-shaped or semi-oval in outline as indicated at 3| in Fig. 4.

It will be appreciated that with the forms of the present invention articles of two different types, styles or sizes may be made simultaneousli7 on opposite sides of the form, for example, with the construction illustrated in Fig. 5B an apron of a large size may be made on one face of the form and an apron of smaller size may be made on the other face thereof. Also an apron or bib as shown in Figs. 1 and 10 can be made o-n one face of the form and a sheet or curtain as shown in Figs. l1 and 12 can be made on the other face of the form.

What I claim is:

1. A dipping form for making a thin rubber article having a reinforced edge, said form comprising a plate of sheet material to which a layer of liquid rubber will adhere, said plate being cut to approximately the outline of the desired article, and a flange attached to a substantial portion of the margin of said plate, said flange projecting from a surface of said form a distance at least equal to the desired thickness of the reinforced edge of the article whereby -a rubber article having a reinforced margin can be deposited on said form, and means for supporting said form with its principal plane in an upright position.

2. A dipping form for making a thin rubber article having a reinforced edge, said form comprising a plate of sheet material to which a layer of liquid rubber will adhere, said plate being cut to approximately the outline of the desired article, and a flange attached to a substantial portion of the margin of said plate, said flange projecting from a surface of said form a CListance greater than the thickness of the rubber layer to be deposited on said surface whereby a rubber article having a reinforced margin can be deposited on said form, and means for supporting said form with its principal plane in an upright position.

3. A dipping form for making a thin rubber article having a reinforced edge, said form comprising a plate of sheet material cut to approximately the outline of the desired article, sheetlike pieces attached to the face of the plate to define re-entrant edges of the article, and a fiange of material attached to a substantial portion of the margin of said plate, said pieces and said flange projecting beyond the surface of said plate a distance at least equal to the desired thicknesses of the reeinforced edges of the article.

4. A dipping form for making a thin deposited rubber article having a reinforced edge, said form comprising a plate of sheetmaterial tozwhich a layer of liquid rubber will adhere, said plate being cut to approximately the shape of the desired article, and a flange integral with a substantial portion of the margin of said plate, said ange projecting beyond the surface 'of said plate a distance at least equal to the desired thickness of the reinforced edge of the article.r

5. A dipping form for making lthin deposited rubber articles comprising twoplates of sheet material cut to approximately the outline of the desired article and a flange formed on a margin of each of said plates, said plates being joined together with their edges in substantial registry.

6. A dipping form .for making a thin rubber article having a reinforced edge, said form comprising a plate of sheet material'to which a layer of liquid rubber will adhere, said plate being cut to approximately the outline of the desired article, and a strip conforming to and joined to a substantial portion of the edge of said plate, said strip projecting beyond the face of said plate a distance at least equal to the desired thickness v of the reinforced edge of the article.

'7. A dipping form for making thin rubber articles having reinforced edges, said formcomprising a plate of sheet material to which layers of liquid rubber will adhere, said plate being cut to approximately the outline of the desired article, and a strip conforming to and attached to a substantial portion of the edge of said plate, said strip projecting beyond each face of said plate a distance at least equal to the desired thickness of the reinforced edges of the articles.

8. A dipping form for making thin rubber articles having a reinforced edge, said form comprising a plate of sheet material to which layers of liquid rubber will adhere, said plate being cut to approximately the outline of the desired article, and a stripof bendable material having a groove therein, a substantial portion of the edge of said plate being attached to said strip in said groove whereby said strip projects beyond each face of the plate as a marginal flange to generate integral reinforcing ridges at the edges of the articles.

9. A dipping form for making a thin rubber article having a reinforced edge, said form comprising a generally rectangular plate with a curved end extension cut from sheet material to which liquid rubber will adhere, and a piece of sheet material having an enlarged portion and a reduced portion superimposed on and attached to a surface of said extension and to the adjacent portion of said plate, said reduced portion extending approximately to the edge of said curved extension to define an opening in said article.

10. A dipping form for making a thin rubber article havinga reinforced edge, said form comprising a generally rectangular plate with a curved extension on one end cut from sheet material to which liquid rubber will adhere, a piece of sheet material having an enlarged portion and a reduced portion superimposed on and attached to a surface of said extension and to the adjasaid curved extension to define an opening in said article, and a raised ange attached to substantial portions of the margin of the sides and other end of said plate and projecting to an abrupt edge adjacent the surface of said plate whereby a reinforcing ridge is generated in a portion of the margin of the resulting article.

11. A dipping form for making a thin rubber apron having a reinforced edge, said form comprising a generally rectangular plate With a curved extension on one end cut from sheet material to which liquid rubber Will adhere, a piece of sheet material having an enlarged portion and a reduced portion superimposed on and attached to a surface of said extension and to the adjacent portion of said plate, said reduced portion extending approximately to the edge of said curved extension to define a neck opening in said apron, a raised ange attached to substantial portions of the margin of the sides and other end of said plate and projecting to an abrupt edge adjacent the surface of said plate whereby a reinforcing ridge is generated on certain margins of said apron, and an elongated wedge-shaped piece of sheet material attached to said surface of said plate adjacent each side edge thereof, one long edge of each piece extending in spaced relation along its related side edge to dene a tie for said apron, each piece having a, long curved edge merging with a curved edge of said extension to define a portion of the top portion of said apron.

12. A dipping form for making thin rubber plate on a substantial portion of the margin Y thereof, each ange projecting from a face of said plate a distance at least equal to the desired thickness of the reinforced edge of the articles, whereby a rubber article having a reinforced margin can be deposited on each face of said form, and means for supporting said form with its principal plane in an upright position.

13. A dipping form for making a thin rubber apron having a reinforced edge, said form comprising a generally rectangularA plate With a curved extension on one end cut from sheet material to which liquid rubber will adhere, a piece of sheet material to dene a neck opening in the resulting apron attached to a surface of said extension, a raised flange attached to substantial portions of the margin of the sides of said plate and projecting beyond the surface of said plate wherebya reinforcing ridge is generated on certain margins of said apron, andA elongated pieces of sheet material attached to said surface of said plate, said pieces extending in spaced relation along the side edges of said plate to define ties for said apron, each piece having an edge merging with a curved edge of said extension to define a portion of the top portion of said apron.

ABRAHAM N. sPNEL.