USRE14603E - roberts - Google Patents

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USRE14603E
USRE14603E US RE14603 E USRE14603 E US RE14603E
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United States
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mold
room
air
article
pressure
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  • This invention relates to the productionof hollow rubber articles which may contain, either permanently or temporarily, an 1 internal air pressure.
  • a convenient illustration of such an article is a playing ball, though many sorts of articles may be constructed by the same process, for example, bulbs of various sorts, rubber toys, hot water bottles, tubes for pneumatic tires, etc., in all of which cases an internal fluid pressure is desirable, at least until after the article has been vulcanized.
  • My invention provides an air-tight room of sufficient size to accommodate one or moreworkmen, and means for maintaining compressed air having the desired pressure, within the room. Access to the room or exit therefrom, for the operators, the molds and the materials, is efiected by means of an air lock associated with the room.
  • the operator brings together, mechanically or by hand, the parts of the article, soas to entrap air within it. Thereafter, the article with such entrapped air, is held between mold members which are removed from the room and placed in a suitable vulcanizer, where the curing is completed.
  • the process includes various other features, any or all of which may be employed, as desired.
  • the first additional feature to which I call attention is the pneumatic forcing of rubber stock to its seat in forming molds by simply venting the mold cavities to the outside atmosphere, enabling theair pressure within the room to form the parts of the article before they are brought together to entrap air.
  • Another additional feature which may be employed in my process accomplishes the entrapping within the article of air of a higher pressure than suitable for the operator to continuously breathe, and of a higher pressure than the mere adherence of raw 5 rubber parts would retain. This is efi'ecteclby surrounding the separated mold members in the room by a easing into which compressed air of a higher pressure than that in the room may be forced.
  • FIG. 1 is a side elevation o the air room with its air look, a suitable mo ding press within the room being shown in dotted llnes;
  • Fig. 2 is a sectional plan of such apparatus;
  • Fig. 3 is a vertical section, on a larger scale, of the molding press shown in Fig. 1, this view beingat right angles to the plane of Fig. 1;
  • Fig. 4 is a plan of a mold plate which may be employed;
  • Fig. 5 is a cross section of two of such plates, showing their relative position before they" are brought together;
  • Fig. 6 is a plan of a clamp whlch may be used to.
  • FIG. 7 is an enlarged view in vertical section illustrating one of the mold cavities and showing rubber stock in place therein;
  • Fig. 8 is a view on the same scale as Fig. 7 showing a vulcanizing mold which may be employed with the article illustrated in Fig. 7
  • Fig. 9 is an outside view of a ball produced. by the molds shown in Figs. 7 and 8;
  • Fig. 10 is a side elevation of a simpler formof'mold press, which may be employed for some purposes;
  • Fig. 11 is a plan of such mold press;
  • Fig. 12 is a vertical cross section, on an enlargedscale, through one of the mold cavities of the mold plates shown in Figs.10 and 11;
  • Fig. 13 is a perspective view illustrating a hand operation of bringing two article-parts together;
  • j 14 is a vertical section through a vulcanizing' mold for use when the hand operation illustrated by Fig. 13 is emplloyed
  • Fig. 15 is an outside view of the artic e produced by either the mold shown in Fig. 12, or that in Fig. 14.
  • an air-tight room is shown comprising a partially cylindrical wall 1, a. base 2 a cover 3, and a door 4.
  • This door also forms the inner door of the air lock, which. comprises a rectangular chamber bounded by an extension 5 of the base, vertical walls 6 and 7 and An outer door 9 completes the air lock.
  • the vertical walls, tops and base shown are secured together in an air-tight manner.
  • Suitable gas'ketsare provided around the doors 4 and .9,- to enable these doors to make an air-tight connection, and the doors are p'rovidedwith locking levers 14 and 15, enabling either door to'be locked unlocked from within the airlock or on V the other side thereo i 16 indicates a pipe adap compressed air from a suitable pump or other soilrce.
  • One branch 17 of this pilp'e leads into the an room and is controlled y 'a valve 18 therein, and other branches 19 the air lock, being conand 20 lead into trolled by valves '21 and22, res ectively inside of thelock and outside. 0?
  • vent pipe from the air room to theouter air being controlled by a valve 24 within the room.
  • 25 and 26 indicate vent pipesfrom the air lock, controlled by suits able valvesinside and outside of the ,lock respectively.
  • 27 and 28 indicate valved passageways whichma be provided, between theroomand air loc to insure equalization of pressure.- Suitable pre'mure gages, will be provided forthe room and air lock, as
  • the air under a pressure in which a workman may conveniently operate may readily be maintained within the room, while access to or from the room may be 7 efl'ected through the air look, without disturbing the internal pressure.
  • This air lock 2 also enables the passage of molds and material to and from the room.
  • Figs. 1 and 3 indicates the base of the mold press from which rise standards- 31 carrying a head 32. On the base is shown a frame 33 carryin ders 34, from which rise p ungers 35, which carry at their tops a hollow platen 36. A hollow platen 38 is also shown as secured to the underside of the head 32. Each of these platens has passageways which com- ,municate with cavities in mold members 40 and 41 secured to the respective platens.
  • Figs. 4 and 5 illustrate one form of mold plates, which may be securedtothe plata pair' of cy1in-- ens by suitable fasteners.
  • FIG. 5 indicates a peculiar shape which, will be hereinafter referred to.
  • These cavities -have:vents 44 which are adapted to register with openings in the hollow platens.
  • 50 (Fig. 3) indicates a vent pipeleading from the platen 38.
  • - 51 is a vent passageway'within-one'of the plungers 35 leading from'the platen 36. This passageway communicates with a flexible pipe 53.
  • the pipes50 and 53' are shown'as join ing and leading outwardly by a T-connection through the pipe 55, which is provided with a valve 56.
  • I may provide a rectangular frame, shown in Fig. ,6.
  • This frame as shown, consists of two members 60 and 61, each extendin around two sides of the mold and provided at their ends 'with means for drawing the members together, as for example, the thumb nuts 63 on ping within each article air bolts 64.
  • it may be sufiicient, to simply lay the stock across the mouths of the molds and then vent them. Or the vents may be slightly opened and then the rubber stock placed against the mold face, when it will immediately sink into the cavities.
  • cylinders M and plungers 35 are provided. indicates a pipe adapted to convey liquid under pressure to the cylinders 34. 71 is a valve controlling this pipe adapted to place it in communlcation with the supply, or close it entirely, or drain i through the pipes 72*? 3.
  • pressure of air in which the operator may conveniently work may be as high as desired within the article, and in such case it is only necessary to provide so much of the apparatus as has been described, or a substitute for those parts, as hereinafter referred to.
  • a central hydraulic cylinder 80 adapted to be fed by a pipe 81, controlled by a valve 82, which may drain through the passageway 83 to the pipe 73.
  • a plunger 85 carrying a-box 86, which has ears 87 slidably embracing the standards 31.
  • the plungers 35 extend through the base of this box 86 in a slidable but air-tight manner, stufiing boxes being omitted for simplicity of illustration.
  • a rectangular gasket 88 Directly above the wall of the box 86 is a rectangular gasket 88, carried on the under side of the platen 38. 90 indicates a pipe for compressed air passing from outside of the room to the interior of the box 86, this pipe being connected with the box by a flexible connection and being controlled by a valve 91.
  • the parts of the rubber stock are caused to seat in their cavities by opening the vent valve 56, as already described; then, before the mold parts are brought together, the valve 82 is opened and hydraulic pressure admitted to the cylinder 80, which raises the box 86 and forms a closed chamber about the mold members.
  • valve 91 is opened and compressed air of any pressure desired is admitted to the interior of the box 86, the pressure being indicated by the gage 93.
  • the valve 71 is opened and the plungers 35 I raised, thus closing the mold within this surrounding air of higher pressure.
  • the air ressure is then reduced within the air 1 from the outside (by means of the external valve on the vent 26) and then the supply of molds is removed and a supply of empty molds placed in the air lock, the door closed and the-pressure built up, through the passageway controlling the external valve 22.
  • the article be closed by the present Jprocess, in aroom containing an air pressure of twenty-five pounds, it may readily I be transferredto a vulcanizing mold while the latter is in that room, and thus a pressure for vnlcaniz ing, because the internal. pres.-.
  • the opening of the box 86 discharges thehigher 'pressure airinto'the'room and thus to a greater or less extent may compensate for lea age from theroom.
  • the pressure in the room is maintained at the desired amount (indicated by some suitable gage, not shown) by occasional operation of the admission and venting valves 18 and 24.
  • vent pipe 23 may conveniently lead from the bottom of the room and the admission pipe 17 enter at the top, so that the operator may use these pipes for supplying fresh air as needed for respiration, the vent valve 24 bein occasionallyo ened to allow the exit of t e carbonic aci which would accumulate near the floor.
  • TlllS screw is shown as having a head 124 rotatably held the mold plate 120, having threads engagmg internal threads in the mold plate 121.
  • a removable socket wrench 125- provides means for rotating the screw. owelwpins'126 properly position one mold plate over the other.
  • This mold press may conveniently be carried on the portable support indicated at 128. 1
  • B may vbe supplied to the operators within the room. Such. operators separate the mold plates sufliciently'to insert these hemispheres and then turn down the screw, bringing the parts together'to entrap the air of the semi-cured hemispheres, 1
  • Figs. 13 and 14 illustrate a still simpler When the distorted ball is removed from way of making an inflated hollow rubber the mold of Figs. 5 ad 7, it is put into a article.
  • the two article-sections spherical vulcanizing "cavity, as shown in shown as hollow hemispheres B, B, with Fig. 8. It is convenient to make the article beveled edges b), have cement placed on slightly smaller in diameter than that of the their meeting edges and are simply brought vulcanizing cavity, as illustrated in Fig. 8, together by hand in the room, as illustrated as this provides for the expansion of the b the operators hands C in Fig. 13.
  • the arrup 132 overhanging wedge-shaped ribs 133 ticle may be of a dented. shape when it is and 134, as heretofore explained in connecplaced in the vulcanizing mold, but it will tion with Fig. 8.
  • the article is placed in assume true spherical shape when the vulthis mold with the diametric seam out of canizing mold is removed from the room, as registration with the faces of the molds, the air in the mold cavity outside of the ar-- as illustrated in Fig. 14, the result being ticle'will leak out between the mold plates.
  • B igs. 5 and 7 show a peculiar form of may be taken from the vulcanizer, and, after mold adapted for use in making a ball.
  • I cooling passed into the air room, and there I opened.
  • the pressure within the article is rubber stock into cavities the effect is to thus entirely or partly counterbalanced, by stretch the stock most at the central porthe external pressure in the room, and the tion, leaving it thicker adjacent to the edges troublesome concentrated bulging does not of the mold, and, accordingly, it is difficult result.
  • the finished to make, by such process a wall of uniform articles are removed from the room through thickness from initial stock which has a unithe air lock, where the pressure is gradually f hi k T save th expense d reduced.
  • the ber ball consisting of bringing hemispherical sectionstogether-in a room occupied by the operator and filled with co procem of making a hollow rub pressed air
  • venting the mold cavity hollow rubber v consisting of placing raw rubber stock across the mouth of a mold while the p to'a point where as high an air pressure the rubber stock is seated in the cavity, then bringing such seated stock into conjunction with other stock to form a closed article with compressed air,-venting the cavity to the outside air to allow the compressed air pressure to force the stock to seat in the mold cavity, bringing such formed part into conjunction with another part to entrap compressed air, transferring the closed article to a vulcanizing mold and vulcanizing it therein.
  • An ap aratus for carrying out the 'hed comprising a room adapted to house the operator, means for admitting com ressed air to the room, a cavitarymold. in t e room, and means for causing pneumatic communication between the mold cavity in the room and a point outside of the room.
  • An apparatus for carrying out the process described comprising a room promeans for admitting compressed air to the room, and means for venting .a mold cavity in the roomrto a point outside of the room.
  • the combination with suitable walls providing a'closed air chamber, an air lock adapted to communicate with said chamber and having two doors leading to and from the lock, pipes for conveying compressed air from the interior of theroom, a cavitary mold in said room, and a pipe leading from the mold cavity to a point outside of the 27...
  • v 28 In an apparatus of the class described,
  • an air lock adapted to enable communication with the room, means for supplying compressed air to the room and air look, a mold within the room having cavities, passageways from said cavities to a point outside of the room, a valve for con- 33.

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