US2077013A

US2077013A - Glass forming machine

Info

Publication number: US2077013A
Application number: US64385A
Authority: US
Inventors: William R Ruck
Original assignee: Hazel Atlas Glass Co
Current assignee: Hazel Atlas Glass Co
Priority date: 1936-02-17
Filing date: 1936-02-17
Publication date: 1937-04-13
Anticipated expiration: 1954-04-13

Description

w. R. Ruck 2,077,013

GLASS FORMINGv MACHINE April w, 193?.

Filed Feb. 17, 1956 "Z6 l :tir-ll i il 21 Patented Apr".` l?, i193? oFFICEf y 'Guss Fonmfzo MACHINE `William R. Buck, Clarksburg-W. Va., assigner to'.

Hazel-Atlas Glass Company, Wheeling, W. Va.; a corporation of West Virginia Application February 17,1936, serial No. 64,385*

rrclaims.' (cite- 35) The invention relates particularlyto forming machines vof the press type,` although it could be used with other types of forming machines.

In the manufacture of pressed tumblers andfA other pressed glass articles, the moltenglass in` the mold is subjected to very great pressure by' the, pressing plunger; and when the plunger starts its upward movement, relieving-the glass 'of the pressure, there is a tendency for the usual .'.0 valve in the mold bottom to rise with the plunger. This slight movement of the mold valve causes, as I have discovered, a minute crack to often appear in the glass tumbler' or other pressed"- article. Accordingly, the bjectof the present i5 invention vis to. prevent the. presence of these` cracks, which results in considerable loss of iin- I ished ware-by the provision of mechanical means for positively and rigidly maintaining the`mold valves in their seated position during the pressing operation.

' The invention 'will becle'arly understood from .I

the following detailed description, when taken in connection with the accompanying drawing, in which, t

Figure 1 is aside elevational view of the apparatus, with the mold valve released; and

Figure '2 is a vertical sectional view of the apparatus, with themold valve lockred in seated vposition.

Referring to the 'drawing in more detail, nu-

meral I refers to the ordinary mold table whichA carries -the desiredl number of press .molds 2, The lmolds are removably mounted on the table by any desiredmeans, as by a plate I in which the mold rests, and a wedge I which clamps the;

mold in positlon; the wedge being operateddby a screw5.` L f `The mold table is rotated l usual manner, andbrin'gs the molds successively 40 to' the feeding-station, where a glass charge is fed to each mold, .and thence to the pressing sta.- tion, where a pressing. plungenenters the mold and forces the molten glass into the shape o the desired article, such fas a tumbler 6. f In thedrawing the mold is shown atthe pressing station, andthe pressing plunger* 1- has descended into the mold and forced the glass charge into the shape of the tumbler.v In accordance with the conventional practice theshaping or impressing plunger is removably, attached -to the Y .lower end ofapiston`rod 8, which rodis operated at the desiredltlmeby a cylinder'. L The usual `-neck ring 9 is attached to thelower springl plate I0., Of course varioussizes and of 66 plungers-l and molds are employed as desired, de-

ysiredv moment4 theiingers are caused to engage step erster, in,tne-

form..

pending upon the particular worlt at hand. This structure is old and well known in the art, and:

no detailed description thereof is necessary.

' The mold plate 3 carries a downwardly ex-A tending cage II in which is mounted for verticalv 5 slidingmovement a mold bottom valve I2. The upper end of the valve extends into the mold' downward. Theconstruction ofthe levers is such that when they arehanging freely the fingers II are free of the valve angeA I3; but at the ieover the Tvalve flange and lock the valve rmly in its down position. The preferred mechanism for'locking the valve will now be described.

'Numeral I9 refers'to acylinder mounted on the machine base plate 20.', At'the proper in- '25 staiit,cmpressed air is admitted through the port' 22 to the lower end of cylinder I 9, to'lift 'the piston 23 and its piston 'rod .24. Mounted on the upper Vend of the piston rod is 'a wedge member 25.r The surface of this. wedge member 30 is preferably, curved, as shown, or inclined, so that it will engageI the lower portions lIB of the levers I6,- and thereby force the flngers I' I into engagement'with the mold valve ange I3,there, by positively and rigidly maintaining the mold 35 valve in its lowered position.

Compressed air-maybe admitted -to the lower end of cylinder I9, to lockthe mold valve in its lowered position, as ,soon as the mold comes to the pressing station, but in any event this operation occurs -before the`pressing vor shaping plunger I starts its upward movement, after having shaped the molten glass charge in the desired `Shortly after the' pressing or shapingfplunge'rv $45 has started .its upward movement, compressed air is Jadmitted to the `upper en d 'gf cylinder |9I zy through port 2I to move piston 23, piston rod 24 and wedge member 25 downwardly, thereby releasing the'clamping levers and permitting the 50 lower portions to' fall by gravity to withdraw the lockingl fingers from engagement with the mold valve -ilange I3. The parts arenclw inthe Aposij tion shown in Figure 1 and the'unold table-is now `i'ree torotate another step. The forma'-- 55 tion of the article having been completed, .the mold with the completed` article is carried for? ward to the delivery station; and a cam or other means is provided to engage the lower end of the plug Il and lift it, thereby elevating the nished piece of ware to a position where it can be engaged by hand or by a take-out device, for removal. .As shown in the drawing the plug I 4 is'slidably mounted in the cage Il beneath the l0 'lower end of the mold valve. 'I'he means for ele vating the plug is old and well known, and hence illustration thereof is unnecessary. It will beA understood, of course, that a cage with its locking levers ,is provided for each mold, and that a cylinder and wedge member operated thereby are provided only at the pressing station, to which station the molds are successively brought, step by step.

The operation of the apparatus is extremely simple, and has been fully described above in connection with the description of the apparatus. While the apparatus is simple in construction and operation yet it performs a new and. highly desirable function in rigidly maintaining the mold valve in lowered position while the pressing plunger is being withdrawn, particularly during the initial part of the plunger withdrawal. And

as stated hereinbefore this initial withdrawal movement of the pressing plunger tends to lift Athe mold valve, which results in the formation of minute cracks in the finished articles, as I have discovered. 4

While I have shown and described the vpreferred embodiment of my invention, it will be at once apparent, to those skilled in the art, that many changes and modifications may be made in the particular apparatus disclosed without departing from the spirit of the invention, and all such changes and modifications are intended to be included within the scope of the appended claims.

What I claim is: A 4 1. A glass forming machine including a mold, a pressingplungena valve arranged in the bot' tom of the mold, said valve being upwardly movable to lift a finished article from the mold, and means adapted to be periodically interlocked with the valve for maintaining'/ the valve in lowered position during part of the pressing operation.

2. A glass forming machine including a mold, a pressing plunger, a valve arrangedin the bottom *of the mold, said valve being upwardly `movable to lift a finished article from the mold, and means adapted to be temporarily interlocked with` the valve in lowered position,y said means rendered operative before the pressing plunger starts its upward movement.

3. A glass forming machine including a mold, a pressing plunger, a cylinder forl moving the plunger into and out of the mold, an upwardlyl movable valve in the bottom of the mold, ad cylinder operated'means for maintaining the valve in lowered position at the desired time- 4. A glass forming machine including a mold,

a pressing plunger, a cage depending beneath the 85 mold`,a valve arranged in the bottom of the mold and mounted for vertical sliding movement in the "cage, and mechanical means for temporarily en-` gaging the valve and preventing upward movement thereof.

5. A glass forming machine including a mold, a pressing plunger, a cage depending beneath the mold, a valve arranged in the bottom of the mold and mounted for vertical sliding movement in the cage, a flange formed on the valve, and a. finger adapted to engage over the flange to prevent upward movement thereof. 1

6. A glass forming machine including a mold, a pressing plunger, a cage depending beneath the mold, a valve arranged in the bottom of the mold and mounted for vertical sliding movement in the cage, fingers mounted adjacent the valve, and means for moving the fingers into engagement with the valve to prevent upward movement thereof.

7. A glass forming machine including a mold, a pressing plunger, a cage depending beneath the mold, a valve arranged in the bottom of the mold and mounted for vertical sliding movement in the cage, levers pivotally mounted adjacent the valve, fingers provided on the upper ends of said levers, and means for engaging the lower portions of the levers to force the fingers into engagement with the valve.

8. A glass'forming machine includinga mold, a pressing plunger, a cage depending beneath the mold, a valve arranged in the bottom of the mold and mounted for vertical sliding movement in the cage, levers pivotally mounted adjacent the valve, fingers provided on the upper ends of said levers, and cylinder operated means for moving the ngers into engagement with the valve, said ilngers'being withdrawn by gravity.

9. A glass forming machine including a mold, a pressing plunger, a cage depending beneath the mold, a valve arranged in the bottom of the mold and mounted for vertical sliding movement in thecage, levers pivotally mounted adjacent the valve, fingers provided on the upper ends of said levers, and a wedge for engaging the lower .porev tions ofthe levers to force the fingers into locking position with respect to the valve.

10. A glass forming vmachine including a mold, a pressing plunger, means for moving the plunger into and out of the mold, a cage depending beneath the mold, an upwardly movable valve arranged in the bottom of the mold and mounted for vertical sliding movement in the cage, means 'for loclclng the valve in lowered position before the pressing plunger starts its upward movement, and means beneath the valve adapted to be operated to lift the valve after the pressing operation.

11. A glass forming machine including a mold, a pressing plunger, means for moving the plunger 'into and out of the mold, a cage depending beneath the mold, an upwardly m'ovable `valve arranged in thebottom of the mold and mounted for vertical sliding movement in the cage, means for locking the valve'in-lowerd position before the pressing plunger starts its upward movement, and a plug mounted in the cage beneath the valve, said plug adapted to be lifted to lift the valve after the pressing operation.

WILLIAM R. RUCK.