US1864689A - Glass forming machine - Google Patents

Description

June 1932 l. H, FREESE ET AL I 1,864,689

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g'rvuewtow Ma Pa E li'fease I flallerfifimaaiz Patented June 28, 1932 UNITED STATES PATENT OFFICE IRA H. FREESE AND HALLER H. DAWSON, OF CLARKSBURG, WEST VIRGINIA; LULA.

1. DAWSON, EXECUTRIX OF SAID HALLER I-L DAWSON, DECEASED, ASSIGNORS TO HAZEL-ATLAS GLASS (.70., OF WHEELING,

wnsr VIRGINIA WEST VIRGINIA, A CORPORATION OF GLASS FORMING MACHINE Application filed March 25, 1926.- Serial No. 97,396.

The invention relates particularly to improvements 1n machlnes for forming pressed ware, but it will be apparent that certain features of the invention are equally well adaptable to machines for forming blown ware. I

One of the objects of the invention is to provide an improved and more efficient means for tightly closing the mold halves during the pressing operation.

Another advantage of the invention resides in the provision of an improved spring connection between the pressing plunger and its operating crosshead, whereby broken springs may be renewed, or springs of different strength substituted, quickly and easily, and without dismantling the appa manner, and it involves a great many novel and advantageous features which will be apparent to those skilled in the art,'from the following detailed description; .and the several features are referred to above merely forthe purpose of giving a general idea of a few of ithe improvements, rather than an attempt to list all of the advantages of the machine.

Referring to the drawings:

Figure 1 is a front elevational view of the vmachine; various elements which are Well known and common in practice, having been omitted from the drawing.

Figure 2 is a side elevational view of the machine, various well known parts having been. omitted also from this figure. {",Figure 3 is a front elevational view of the pressing mechanism and the means for tightly closing the mold halves during the pressing operation; parts being shown in vertical section.

Figure 4 is a detail horizontal sectional I View taken on the line 4.4 of Figure 3.

lgure 5 1s an elevational view of the machlne, and showing particularly the feeder mechanism, the shears, and the means for I lifting the ware from the molds.

Figure 6 is a horizontal sectional view taken on line 66 of Figure 5, and showing particularly the shears, and operating mech-' anism therefor and the means by which they are mounted on the machine, and also showing the driving mechanism for the forming machine; other parts being omitted from the drawing for the sake of clearness.

Figure 7 is a plan view of the improved cam tracks for opening and closing the molds; and

Figure 8 is a plan view of the wind boxes and the mechanism for operating the valves associated therewith.

Referring to the drawings more in detail, numeral 1 indicates the frame of the machine, which is preferably mounted on rollers 2.

The driving mechanism is best illustrated in Figures 2, 5 and 6, and by reference to those figures it will be seen that a bracket 3 is rigidly attached to the machine frame, and

mounted on the bracket is a motor.4, for driving various parts of the apparatus. The motor shaft carries a pinion 5 meshing with the large gear 6 fixed to the shaft 7 A friction clutch 8 is mounted on the shaft 7 and carries the pinion 9. The friction clutch is operated by cam fingers 10; which fingers are operated by the rotation of the disk 11 having the beveled surface 12 which cooperates with the beveledsurface 13 of the fixed member 14. The disk 11 is rotated by means of a link connection 15 with the operatinglever 16. Thus by the operation of the lever 16 the entire machine may be thrown into or out of operation. Obviously, any preferred form of friction clutch and operating means therefor, may beemployed, and as the particular clutch shown herein forms per se no part of the invention, it isunnecessary to describe any details "of the construction. The

- nism shown herein, is quite similar to the clutch mechanism disclosed in the patent to Strub #947,204, dated January 18, 1910.

The pinion 9 meshes with a gear 17 fixed to the main drive shaft 18. This shaft carries a bevel gear 19 which meshes with the bevel 20 to operate a Geneva wheel 21. The

rotary mold table 22, carrying molds 23, is

given an intermittent, or step-by-step, ro-

tary motion, by means of the Geneva wheel 21; and as this means of intermittently rotating the mold table is so well known, and is in such common use, it is deemed unnecessary to describe the details of the construction. Y

As the'mold table rotates step-by-step, the molds-are successively brought to the chargingstation, then the pressing station, etc. As the first step in the formation of the glass ware is the feeding of the glass to the molds,

we shall first describe the feeding mechanism, the shears for severing the gobs, and the means by which the feeding mechanism and shears are mounted on the machine.

Referring particularly to Figures 5 and 8 numeral 24 indicates a fixed standard supported by the frame of the machine, and on this standard the feeder mechanism and shears are mounted. The particular'feed ing mechanism shown herein is substantially the same, in many respects, as that disclosed in the patent to Stenhouse #1,542,013, grant ed June 16, 1925, and this feature of the present invention relates not to the particular feeding mechanism, but to the combination of the feeder mechanism mounted directly on the forming machine.

The well known reciprocating feeder plug is indicated by numeral 25; and when the forming machine is in operative relation with a melting tank, the plug will be positioned in the flow spout (not shown) and in vertical alignment with the usual flow orifice. The plug is carried by a piston rod 26foperated by a cylinder 27. The means by which the p ug and the operating cylinder are bodily "adjusted vertically, will now be described.

ranged for vertical adjustment within theslide bracket 28 is a slide 30. This slide is vertically adjusted by means of a rod 31 which has its upper end attached to the slide, and which has its lower end mounted in a guide bracket 32; the guide bracket being secured to the standard 24 by means of cap screws 33. The lower portion of the rod 31 is formed into a rack 34, which is engaged by a gear 35, operated by hand wheel 36. It is thus apparent that by the rotation of the hand wheel'36, the slide 30 will be raised or lowered to the desired extent. Rigidly attached to the slide 30 is a bracket 37, and rigidly attached to the bracket 37 is the feeder plug operating cylinder 27. So that c linder 27 will also be raised or, lowered, t ereby vertically adjusting the position of the feeder plu 25 with respect to the flow orifice in the ow spout. By means of the foregoing adjustment both limits of stroke of the plug are simultaneously adjusted in the same direction, either upwardly or downwardly.

For the purpose of independently adjusting the upper limit of the plug stroke, a rod 38 is threaded into the upper end of the cylinder 27, and keyed on the rod is a gear 39. Meshing with the gear 39 is a gear 40, which is attached to a shaft 41 rotatably supported in;the bracket 37, and extending downwardly to an accessible position for operation. A

hand wheel 42 mounted on the lower end of the shaft 41, provides a'convenient operating means. Thus by therotation of the hand wheel 42 the rod 38'is raised or lowered in the cylinder 27, thereby raising or lowering the upper limit of the feeder plug stroke.

It will be observed that the entire feeding mechanism is secured to the standard 24 by means of cap screws 29 and 33, and it is thus apparent thatby loosening these cap screws the feeder plug and its operating cylinder may be circumferentially adjustedabout the bination of a feeder with a forming machine.

When the forming machine and feeder are thus combined it is apparent that the necessity for a feeder for each flow spout is elimi nated. Also the forming machine and feeder mechanism will remain in proper timed relation, when the combined unit is moved from one tank to another.

The construction of the shears and the means by which they are mounted on the forming machine, will now be described.

Referring particularly to Figures 5 and 6, the shears for severing the suspended gobs to be dropped into the molds, are indicated by numeral 43. The shear blades are pivotally connected, as shown in Figure 6, and pivotally attached to the shears are links 44; the

links 44 being pivotally attached, at their op posite ends, to thecrosshead 45 secured to the piston rod 46 of the-operating cylinder 47.

Glamped about the standard 24, by means of cap screws 48, is a slide bracket 49; and mounted in the slide bracket is a slide 50 carrying the cylinder 47. The slide 50 is provided with a rack 51, and meshing with the rack is a gear 52-operated by the hand wheel 53. Thus by rotation of hand wheel 53, the

, movement with respect thereto. By rotation operating cylinder and shearsmay be moved longitudinally, either backward or forward,

to bring the shears into the desired position with respect to the glass stream and molds. Further, the bracket 49 is clamped; to the standard 24 by means of cap screws 48, and

consequently by loosening these screws the bracket together'with the cylinder and shears may be adjusted circumferentiall-y of thestandard, thereby providing a further ad justment to bring the shears into proper position with respect to the glass stream and molds. Further, it is often desirable to adjust the shears vertically, so that the formed gobswill be severed at the desired point.

For accomplishing this adjustment we have mounted a bracket 54 on the standard 24, and a lug 55 extending therefrom is tapped to receive the threaded rod 56. This rod passes upwardly through a lug 57 attached to the bracket 49, and has its upper end squared, as indicated by numeral 58, to receiVe a wrench or hand wheel for operating the rod. 'Obviouslythe rod 56 is rotatable in the lug 57, but is held against longitudinal size. and shape of the gobs, various adjust-- ments for the shears, and the means by which the complete feeding and shearing apparatus is mounted on the forming machine to form a combined feeding and forming machine.

Under some circumstances, however, it is desirable to feed a plurality of gobs to each mold, instead of feeding a single gob thereto; and we shall now describe a very simple mechanism by which a single gob feed'may be instantlyconverted into a plural gob feed, and vice versa. Referring particularly to Figures 1,2 and 6, numeral 59 indicates a sprocket Wheel fixed to the main .drive shaft 18, and a sprocket chain 60 connects this sprocket wheel with another sprocket wheel 61, of thesame diameter and loosely mounted on the shaft 62.

This shaft carries valve operating mechanism, indicated by numerals 63 and 64, for operating the valves controlling the cylinders 27 and 47, respectively." The valve op erating means and the valves are old and well known, and per' se form no part of the present invention. Accordingly it is unnecessary and undesirable to illustrate and describe the specific construction-thereof.

In the apparatus thus far described the shaft 62 will rotate at the same speed as the main drive shaft, due'to the sprocket chain connection between the two sprockets 59 and 61; the two sprockets being of the same diameter. main drive shaft to move the mold table one step, the shaft 62 is also given one rotation, to thereby effect one operation of the feeding and shearing mechanism. Therefore a single gob is fed to each mold. In order toefl'ect a plural gob feed, a second sprocket 65, of the same diameter as sprocket 59, is fixed to the 'main drive shaft, and is operatively connect ed by means of aspr'ocket' chain 66, with a sprocket 67; in the specific form illustrated this sprocket being of one half the diameter of sprocket 65. This small sprocket wheel 67 is connected with a sprocket wheel 68, of the same diameter as sprocket wheel and sprocket wheel 68 is connected by means of a sprocket chain 69, with a sprocket wheel 70 of the same diameter and loosely mounted on the shaft 62 adjacent the sprocket 61. Both sprockets 61 and 70 are normally loose on the valve shaft 62,'and a clutch -71, operated by lever 72, .is provided for the purpose of selectively throwing either sprocket into driving connection with the valve shaft.

When the sprocket wheel 70 is in driving connection with the valve shaft, it is apparent that this shaft will make two complete revolutions during a single revolution of the main drive shaft, and consequently two gobs will befed to each mold. To return tosingle gob feed it is only necessary-to move the lever 72 in the opposite direction. While we have shown herein only mechanisms for feed ing one or two gobs to a mold, it is apparent that suitable connections and gear shifting mechanism may be provided to effect the feeding of any desired number of gobs to each mold.

Thus during one rotation of the The cam mechanism for opening and clos- "ing the molds, will now be described.

- The cam construction is shown in Figure 7, and as this figure is solely for the purpose of showing the cam structure, we have omltted other parts of the machine; and the 1 (ram structure has been omitted from other figures. The molds 23 areof the open and shut type, and are formed of two halves pivotally connected at 73. The mold halves are provided with the usual rollers 74, for cooperation with cam tracks for opening and closing the molds. v

.The molds travel step-by-step in the direction of the arrow shown on Figure7. Assuming a mold is at-position A (Fig. 7) in closed condition, and with the rollers 74 engaging the outer walls of the outwardly flared fi'xed cam tracks 75; then it is apparent that when the mold is moved one step it will be brought into open condition at position B. At posibrought into closed condition at position C, where a glass charge is fed to the mold. During the remainder of the complete revolution of the mold table, the molds are in closed condition, until they again reach position A. It is highly desirable, of course, that therebe sufficient pressure on the mold halves to maintain them tightly closed, and where fixed cams are employed it is obvious that due to Wear and tear, etc,, tight joints between the mold halves will not be maintained. Accordingly we have provided cam tracks which are formed in sections; each section being spring-pressed inwardly. Referring back to position C, it will be noted that earn tracks 77, 77, are pivotally mounted at 78, 78. "The opposite ends of these cam tracks are forced inwardly by means of springs 79, 79. These springs are mounted on pins 80, which are slidably carried by brackets 81; the springs being compressed between the cam traclrand the bracket. tent to which the cani tracks project inwardly.

After the molds pass from cam tracks 77, 77, they are engaged by cam tracks 83, 83, pivoted at 845 845 and forced inwardly by springs 79, 79; the construction and arrangement being exactly the same as described in connection with tracks 77, 77. After the molds pass from tracks 83, 83, they are brought to the pressing station 'D. At the pressing station a special mechanism is employed for retaining the molds in tightly closedcondition during the'forming opera tion. This special mechanism will be de scribed hereinafter in connection with the pressing apparatus.

After .the molds pass from the pressing position they are engaged by cam tracks 85, I

85. These cam tracks are the same as those previously described, except that they are much longer sections, and are not pivotally mounted. Instead of being pivotally mounted they are each provided with two or more springs 79 by Which the two tracks are forced radially toward each other to press against the rollers 74: with SllffiClQIltTHQSSUIQ to cause the mold halves to fit closely.

Following the cam sections 85, 85, are two more sections 86, 86, and these are followed by two more sections 87, 87. The sections 86, 86, and 87, 87, have substantially the identical construction as sections 85, 85. After the molds leave spring pressed sections 87 87 they are ready to be opened by means of the opening cam tracks 75, 75, Of course these sections 75, 7 5, are not spring pressed,

as their function is to open the molds.

Obviously this feature of the invention is not limited to the specific cam structure disclosed; it being apparent that many changes and modifications may be made. By the use of these spring pressed cam tracks the molds are retained in the desired closely fitting con- The nuts'82 determine the ex rocated to press the ware.

eaaeee ries the crank pin 89. Une end of a link 90 v is mounted on the crank pin 89, and the opposite end of the link is attached to the crank arm 91 of the crank shaft 92. Thus as the crank 88 rotates the crank shaft 92 will be oscillated. The crank shaft 92 carries two crank arms 93, 93, (Fig. 1), and these crank arms are pivotally attached to thelower ends of links 94, 9 1; the upper ends of the links being pivotally attached to slides 95, 95, which are adapted to reciprocate in slide brackets 96, 96. Also attached to slides 95, 95, and extendingupwardly therefrom, are connecting rods 97, 97, which are attached at their upper ends to outwardly projecting pins 98, 98, carried by the crosshead 99. This crosshead is mounted for sliding movement on the standards 100, 100, carried by themachine frame. By means of the mechanism thus far described, the crosshead is periodically recipmechanism, and the means by which such mechanism is mounted on the crosshead-lOO,

will now be described.

A rod 101 passes through the crosshead 99, and has attached to its lower end the pressing plunger 102; its upper end being threaded to receive the nuts 103, by means of which the .rod and pressing plunger may be adjusted vertically and locked in adjusted position.

Slidably mounted on the rod 101, above the plunger 102, is the usual mold ring 104, which is movably held in its lowermost position by means of springs 105 mounted on pins 106 attached to the mold ring and passing through openings in the frame 107. Nuts pins to limit the downward movement of The pressing the mold ring, and the frame 107 is vertically adjustable on the rod 101, by means of nuts 109, 109', to vary the pressure on the springs. The guide ring is held againstrotation, and in true alignment, bymeans of pins 110 which are suitably guided in a spider frame 111; the spider frame being rigidly mounted on the standards 100, 100, by means of sleeves 112, 112.

By means of the above described structure, when the pressing plunger descends, the mold ring will first come into contact with the mold, and will then be held firmly against the'mold by means of the springs 105, while the pressure plunger 102 continues its descent to form the article in the mold.

It is essential, of course, that some means iza plunger carrying. rod 101, to avoid breakage of parts in case of foreign substance in the molds, and also for the purpose of varying the time of dwellof the pressing plunger in the molds. For this purpose we have devised a novel arrangement of the springs, which function in a highly eflicient manner, and by whichbroken springs may be replaced, or springs of different strength substituted, with the greatest ease and without taking down any parts of the machine. This novel construction includes a frame member 113 which is mounted on the rod 101, and which is vertically adjustable by means of the nut 114. A number of pins 115 are'attached to this frame and extend upwardly therefrom; the pins terminating a substantial distance below the crosshead 99, as clearly shown in Figures 1 and 3. Mounted on each. of these pins is a spring 116, the springs seating at their lower ends on the frame 113,

and abutting at their upper ends against thebottom of'the crosshead 99. Obviously the number of pins 115 and springs 116, will vary in different installations.

In the operation of this feature of the machine, as' the crosshead descends the pressure will be transmitted through the springs 116 to the rod 101 carrying the pressing plunger 102. In the event that some foreign substance should be in one of the molds, thereby stopping the descent of the plunger, the crosshead will continue to descend, and merely compress the springs to a further extent and without damaging or breaking any parts. 116, or by substituting other springs, the time of dwell of the plunger in the molds, may be varied.

In the structure described above, if it is desired to vary the tension on the springs 116, it is only necessary to adjust the nut 114.

- Further, if the springs need replacement because of breakage or otherwise, it is only necessary to lower the frame 113 to relieve the pressure on the springs, and then lift the springs off the pins 115, and substitute other springs. This may be done quickly and easily andv without taking down any parts of the machine, as has been necessary in prior constructions.

As mentioned hereinbefore, a special mechanismis" employed for causing the mold halves to make a tight fit during the pressing operation; and this mechanism will now be described.

Referring particularly to Figure 3, numerals 117, 117, indic-ate two rods which are slidably mounted in the crosshead 99, and

extend downwardly on opposite sides of the molds. The rods are normally forced down ward by means of springs 118, 118, which are mounted on the rods, between the bottom of the crosshead and the adjusting nuts 119, 119, on the rods. Adjusting nuts 120, 120, are

Further, by adjusting the springs also mounted on the rodsabove the crosshead. Attached to the lower end of each rod 117 is a slide 121, which is adapted to reciprocate in a slide bracket 122 fixed to the machine frame. Mounted in each of the reciprocable slides area number of rollers 123;

the rollers gradually increasing in diameter from the bottom to the top, thereby present- 7 ing an inclined rolling surface. Instead of having the rollers of gradually increasing diameter, the rollers could all be of the same diameter but with theiraxes arranged in an inclined plane instead of in a vertical plane as illustrated. The inclined rolling surface cooperates with tapering or wedge-like lugs 12 1 provided on each side of the molds.

In the operation of this mechanism, as the slide, frames 121 have descended as far as possible, the crosshead may continue to desure on the slide frames and mold sections.

After the articles have been completely formed, and are ready tobe removed, they may be elevated from the mold by an unusually simple elevator mechanism, which will now be described.

Referring particularly to Figure 5, numeral 125 indicates a crank disk fixed to the scend, and will merely exert a further presmain drive shaft 18 and carrying a wrist pin 126. Loosely mounted on the press operating shaft 92,'is an oscillatable arm 127, carrying at its upper end a curved cam track 128. The oscillatable arm is operatively connected with the wristpin 126 by means of a pitman 129; and the arm is counterbalanced y means of weight 130. A plunger 131 is suitably mounted on the frame of the machine, and carries on its lower end a roller 132, adapted to ride in the curved cam track I 128. A stem 133 depends from each mold bottom, and when the molds reach the discharging position the stems are in alignment with the plunger 131. So that when each mold is at the discharging station the arm 127 and cam track 128 will be moved to the left (Fig. 5), thereby lifting the plunger or elevator 131, and forcing upwardly the stem 133 and mold bottom carrying the finished article upon it, so that it may be readily removed by hand or by any desired mechanism. F urtherrotation of the crank disk 125 moves the cam track to the right (Fig. 5) thereby withdrawing the plunger 131 and permitting the stem'133 and mold bottom to be not completely lowered before the mold table is rigidly attached to the upper end of the plunger 131, and which is preferably inclined'slightly downward. By this means the stems and mold bottoms will be gradually lowered, thereby reducing the wear and tear j on the parts, and effecting a more quiet operation.

The means for distributing cooling air to various parts of the machine, willnow be described.

Referring particularly to Figures 1, 2 and 8, numeral 135 indicates a wind boxwhich receives air from a compressor (not shown) through a'pipe 136. For controlling admission of air to the wind box, we provide a slide valve 137, having the usual opening,

138. A link 139 is pivotally attached at one end to the slide valve 137, and at its opposite end is pivotally attached to one arm of a bell-crank lever 140. The other arm of the bell-crank'lever is provided with a rack 141 meshing with a gear 142. The gear is mounted on a shaft 143 which extends downwardly to a point for convenient operation, and is provided with a hand wheel 144. Obviously, by, the rotation of the hand Wheel the slide valve 137 will be adjusted to increase or decrease the amount'of air supplied to the wind box. The rack arm of the bell-crank lever 140 may be provided with a curved slot 145 to receive a guide pin 145'.

A number of air supply pipes 146 lead from the wind boxes to points adjacent the parts to be cooled, such as the interior of the molds, the exterior of the molds, etc. The air supply pipes may beof various constructions. For

example, the pipe 146 for supplying air to the interior of the molds (see Fig. 2) is provided at its upper end with a ball and socket joint 147, whereby thepipe' may be swung out of the way when it Is not in use. This pipe, as

7 well as some of the others. also has a lower telescoping section 148, which is held in vertically adjusted, position by means of a clam 149. e v

The wind box 135 communicates with another wind box 150, and from this latter wind box the pipes 151 lead for cooling the pressing plunger. These pipes also preferably carry telescoping lower sections 152, which are held in vertical adjusted position by means of clamps 149. The lower ends of the telescoping sections are preferably provided with valves 153, by means of which the amount of cooling air may be controlled.

However, it is desirable at times to entirely shut offthe supply of cooling air to the pressing. plunger, and for accomplishing this we have, provided a slide valve 154 which controls communication between the main wind by Letters Patent is:

neeaeee box 135 and the wind box 150. The slide valve 154 may be operated by means of a hand lever I 155 pivotally mounted on a bracket 156 and having a slotted connection with a rod 157 attached to the slide valve. Thus by the operation of lever 155, communication between the main wind box and the wind box leading to the pressing plunger, may be regulated or be entirely shut off. It will be understood, of course, that the arrangement and construction of the wind boxes, the pipes leading to the parts tobe cooled, the valves, etc,

will vary in different installations.

Referring now to Figure 1, numeral 158 indicates a lever which is connected with means for operating a clutch between thecrank disk 88 and the main drive shaft, by means of which clutch the driving mechanism for the pressing plunger may be rendered operative or inoperative. However, it has not been deemed necessary to illustrate or describe either the clutch or its operating means, as those elements form no part of the present invention.

The operations of the various parts of this forming machine have been described in connection with the description of the construction' of the various parts of the invention, and

therefore any further description of the operation is unnecessary.

No claim is made herein to the combined feeder and forming machine, or to the apparatus for shifting from single gob feed to double gob feed and vice versa, as such subject-matter is claimed in a divisional application, Ser. No. 599,025, filed March 15, 1932.

In accordance with the patent statutes we have described what we now believe to be the ourselves or the scope of the invention, as

many changes and modifications may be without departing from the spirit of the invention; all such we aim to include in the scope of the appended claims.

What we claimas new and desire to secure 1. A glass forming machine, includin a rotary mold table, molds carried by, the table, a pressing plunger, a rod to which the pressing plunger is attached, a frame mounted on said rod, a crosshead for reciprocating the rod arid plunger, pins mounted on the frame and extending toward the crosshead, said pins terminating short of the crosshead, and springs mounted on said pins.

2. A glass forming machine, including a rotary mold table, molds carried by the table, a pressing plunger, a rod to which the pressing plunger is attached, a frame member mounted on the rod, a crosshead member for reciprocating the rod and plunger, pins extendingfrom one of said members toward the other member, said pins being shorter than the normal distance between said members, and springs mounted on said pins.

3. A glass forming machine, including a mold table, sectional molds carried by said table, upwardly tapering lugs provided on the mold sections, a vertically reciprocable member, rollers carried bysaid member and adapted to engage said tapered lugs, whereby the mold is tightly closed by a wedging action.

4. Aglass forming machine, including a mold table, sectional molds carried by said table, upwardly tapering lugs provided on the mold sections, two vertically reciprocable rods arranged on opposite sides of said molds, a slide attached to the lower end of each rod, rollers carried by each slide, the peripheries of the rollers being in an inclined plane, and said rollers and said lugscooperating to exert awedging action on the molds, when the slides are lowered.

5. A glass forming inachine, including a rotary mold table, sectional molds carried by said mold table, a vertically reciprocable crosshead, two rods carried by the crosshead, a spring connection between the crosshead and the rods, a plurality of rollers carried by each rod, each of said rollers being of increasing diameter from the bottom to the top, whereby a wedging action is exerted on the molds when the crosshead is lowered.

6. A glass forming machine, including a rotary mold table, sectional molds carried by the mold table, upwardly tapering lugs provided on the molds, a vertically reciprocable crosshead, a pressing plunger, a spring connection between the crosshead and the plunger, two rods carried by the crosshead, spring connections between the crosshead and the rods, and a 'roller carried by rotary mold table, a pressing plunger, means' for reciprocating the plunger, a spring arranged between said means and the pressing plunger, and a pin on which the spring is mounted, one end of the pin being free to permit the replacement of said spring.

' IRA H. F-REESE.

HALLER H. DAWSON.

each of said rods, said rollers adapted to cooperate with the said upwardly tapering ln s.

A glass forming machine, including a rotatable mold table, an elevator for lifting finished ware from said molds, said elevator including a vertically reciprocable plunger, an oscillatable cam for vertlcallyreciprocating said plunger, a crank operated by the main drive shaft of the forming machine, and a pitman connecting said crank and said oscillatable cam.

8. A glass forming machine including a rotary mold table, a plurality of molds carried by said table, a pressing plunger cooperating with said molds, a main wind box, a valve for controlling the admission of air to said box, pipes leading from said box to various parts to be cooled, an auxiliary wind box communicating with the main wind box, a valve for controlling the air supply to the auxiliary wind box, pipes leading from the auxiliary wind box .to points adjacent the pressing plunger, and valves associated with the lower ends of said last named pipes.

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