US1949886A - Glassware forming machine - Google Patents

Description

March 6, 1934. SQUBIER ET AL 1,949,886

GLASSWARE FORMING MACHINE Filed Sept. 15, 1931 6 sheets-Sheet l March 934. L. D. SOUBIER ET'AL 1,949,336

GLAS'SWARE FORMING MACHINE Filed Sept. 15, 1931 6 Sheets-Sheet 2 March 6, 1934. D, SQUBIER r AL 1,949,886

GLASSWARE FORMING MACHINE March 1934. L. D. SOUBIER ET AL 1,949,886

GLASSWARE FORMING MACHINE Filed Sept. 15. 1931 6 Sheets-Sheet 4 Marcl'l 6, 1934. L so ET AL 1,949,886

GLASSWARE FORMING MACHINE Filed Sept. 15, 1931 6 Sheets-Sheet 5 March 6, 1934.

L. D. SOUBIER ET AL GLASSWARE FORMING MACHINE Filed Sept. 15. 1931 6 Sheets-Sheet 6 Patented Mar. 6, 1934 UNITED STATES PATENT OFFICE GLASSWARE FORIWING MACHINE Application September 15, 1931, Serial No. 562,844

6 Claims.

The present invention relates to improvements in glassware forming machines and more particularly to machines comprising a series of blank molds rotating about one axis and a series of finishing molds rotating about another axis in proximity to the path of travel of the blank mold. In this type of machine with which our invention is especially concerned. the molds are moved in a step-by-step fashion along their respective paths resulting in bringing the blank molds one at a time to a charging station where mold charges of molten glass are delivered to said molds through receiving openings which face upwardly at said station. Also it is common practice to project plungers into the neck and body blank molds for cooperation with the neck molds in shaping the neck and finish portions of the articles of glassware being produced.

An object of the present invention is the provision of novel means for compacting the mold charges of glass almost immediately upon their delivery to the molds. To this end there is provided means for closing the charge receiving end of the molds and imparting a glass compacting movement to the plunger, the latter preferably being common to all of the molds. In this manner the density of the glass is considerably increased and because of the resultant intimate contact between the glass and mold exceptionally uniform surface chilling of the blank or parisons is obtained. These conditions contribute materially to the production of high grade glassware having walls of uniform thickness and strength.

Another object is the provision of novel means for applying vacuum to the neck mold cavity simultaneously with or slightly in advance of the glass compressing movement of the plunger. In this manner the glass filling the neck-mold cavity is held against displacement which might otherwise result from projection of the plunger into the blank mold.

A further object is the provision of means operating automatically during a portion of the cycle of operations of each blank mold to compact or compress the mold charges of molten glass in the manner indicated above. To this end the mechanism includes a plunger which may be and preferably is common to the several blank molds, said mechanism oscillating along a predetermined path located between the charging station and the next succeeding station.

, Other objects will be in part apparent and in part pointed out hereinafter.

In the drawings:

Fig. l is a plan view more or less diagrammatic in form showing a glassware forming machine of the two-table type embodying the present invention.

Fig. 2 is a sectional elevational view illustrating our invention. 0

Fig. 3 is a perspective view diagrammatically illustrating the pipes for applying air and vacuum to the various parts of the mechanism.

Fig. 4 is a. detail sectional elevational view of the reversing valve.

Fig. 5 is a front elevational view of the invention.

Fig. 6 is a detail sectional elevational view showing the locking device for the mold table and the valve for controlling the air supply to the motor which actuates the plunger carrying mechanism.

Figs. 7, 8, and 9, are views illustrating the series of operations involved in forming a blank or parison. Fig. 7 shows the mold charge entirely within the blank mold. Fig. 8 is a similar view showing a baffle plate closing the receiving end of the mold just prior to upward projection of the plunger and the application of vacuum to the neck mold cavity. Fig. 9 is a similar view showso ing the plunger projected and the blank or parison completed.

Fig. 10 is a detail sectional elevational view of the air and vacuum control mechanism.

Figs. 11 and 12 are top plan and vertical sectional views respectively of the vacuum valve and its operating mechanism.

Fig. 13 is a detail perspective view of the plunger and its holder.

Figs. 14 to 17 inclusive, illustrate another form of the invention. Fig. 14 is a detail sectional elevational view of the plunger operating mechanism. Fig. 15 is a sectional plan view showing the driving means for the machine. Fig. 16 is a side elevational view with parts in section of the mechanism shown in Fig. 15. Fig. 17 is a plan view more or less diagrammatically illustrating the other form of the present invention.

One form of the invention (Figs. 1 to 13 inclusive) is shown in conjunction with a glassware forming machine comprising a base 20 upon which a blank mold table 21 and a finishing mold table 22 are mounted. These mold tables are arranged side by side and rotatable in a step-bystep fashion about separate vertical axes. Due to such rotation of these tables the blank mold units 23 are brought one at a time to a standstill at a charging station C (Fig. 1) and later to a blank transfer station T between the mold tables. At this transfer station T blanks or parisons are no automatically removed from blank mold units and placed in finishing molds 24 which are carried by the finishing mold table 22. Upon final shaping of the blanks or parisons in the finishing molds they are removed therefrom and placed upon an endless conveyor 25 by means of which they may be transferred to an annealing leer (not shown). By reference to Patent 1,788,312 granted January 6, 1931, to J. W. Lynch et al, the details of construction and operation of the type of machine generally shown in Fig. 1 will be understood.

Each blank forming unit 23 includes a partible body blank mold 26 and partible neck mold 27 which are suitably supported upon an invertible carrier 28 journaled in a bearing 29 on the blank mold table 21. This table is rotatable about a stationary central column 30 rising from the base 20. That end of the body blank mold 26 remote from the neck mold 27 is open and adapted to face upwardly at the charging station C so that a mold charge of molten glass may be introduced into the mold by the action of gravity.

Almost simultaneously with delivery of a mold charge to the cooperating body blank and neck molds one end is shaped to provide the neck and finish of the article of glassware being produced. This shaping operation is accompanied by exceptionally firm compacting of the entire mass of glass in the molds resulting in the production of a blank or parison of more than average density and one having an unusually evenly chilled surface, all of which contributes to the final formation of an article of unusual strength and quality. The mechanism for accomplishing this end, briefly stated, includes a plunger which is positioned in the molds during the charging operation and then moved upwardly relative to the molds immediately upon completion of the charging operation and closing of the receiving end of the molds and means for applying vacuum to the glass in the neck mold during this compacting operation for the purpose of preventing movement of the plunger from pulling any of the glass out of the neck mold. Specifically, the construction involved may be substantially as follows. A plunger 31 (Fig. 2) together with means for raising and lowering it are mounted upon a swinging frame 32 which is supported for oscillation about the central column 30 of the blank mold table and in a plane beneath the molds. By oscillating the frame 32 the plunger which is supported thereby and is common to all of the blank forming units, may cooperate with said units not only during the time they are stationary at the charging station C but in addition during a portion of their travel to the next suc seeding station.

The swinging frame 32 includes a collar 33 encircling the central column 30 just below the table 21 and a radial arm 34, the outer end of which carries a roller 35 resting upon the track 36 on the base 20 and supporting said outer end. Oscillation of the frame 32 is obtained by means of a horizontal piston motor 37 and the blank mold table. During cooperation of the plunger 31 with a blank mold unit, the frame 32 and table 21 are secured together so that they move as a unit for a predetermined distance. The connection between the frame and table is then broken and the piston motor 37 operates to return the frame to its original position. The specific construction in this connection comprises a horizontal motor cylinder 38 open at the end facing the frame 32. A piston 39 is connected through a rod 40 and link 41 to the arm '34 on said frame. An air supply pipe 42 is connected to the closed end of the motor cylinder 38 and leads to a valve 43 (Fig. 6) which in turn is connected to a pipe 44 leading to a source of supply of air pressure (not shown). This valve 43 is alternately opened and closed by operation of the locking device which secures the mold table 21 and swinging frame 32 together. The valve comprises a housing having upper and lower chambers 45 and 46 communicating with each other at times through a passageway 47. A spring pressed valve 48 normally and yieldingly closes said passageway. A valve 49 arranged in an exhaust port 50 in the upper end of the valve housing is normally held open by means of the lower valve 48. A rocker arm 51 is pivoted to a bracket 52 and operated by the locking device as will now be described, for the purpose of periodically closing the exhaust valve 49 and thereby opening the lower valve 48. The locking device whereby the swinging frame 32 is secured to the blank mold table 21 at regular time intervals, comprises a vertical piston motor 53 carried by the arm 34, and a detent 54 or looking pin which is adapted for projection into one of a series of vertical openings 55 in said table. A vertical motor cylinder 56 carries a piston 57 which in turn supports the detent 54 or pin. A cam 58 is secured to the detent 54 or plunger and is adapted for periodic engagement with the rocker arm 51. Air under pressure for raising the piston 51 and detent 54 is supplied to the lower end of the cylinder 53 by way of a pipe 59. A pipe 60 conducts air under pressure to the upper end of the cylinder 53 for the purpose of lowering said piston and detent. Automatic means for regulating the flow of air under pressure through these pipes will be described hereinafter. It will be noted that upward movement of the detent 54 into locking engagement with the mold table 21 automatically opens the exhaust valve 49 and allows the lower valve to close under pressure of the spring arranged in the chamber 46. Thus the motor cylinder is opened to the atmosphere. Rotation of the mold table will impart corresponding movement to the swinging frame 32 and mechanism carried thereby. Such movement of these elements causes travel of the piston 39 (Fig. 5) to the outer end of the cylinder 38. Because of the fact that the pipe 42 opens to the atmosphere through the exhaust port 50 building up of pressure within the cylinder is avoided. When the detent 54 is retracted the cam 58 thereon rocks the arm 51 so that the exhaust valve 49 is closed and the lower valve 48 opened. This results in the application of air to the outer end of the motor cylinder 38 and consequent return of the frame 32 to its original position.

Simultaneously with upward projection of the detent 54 into locking engagement with the mold table 21 the plunger 31 (Figs. 2, 7, 8, and 9) is projected into the neck and body blank molds for cooperation therewith in the shaping of the finish and neck portions of a blank or parison. The plunger occupies its lowermost operative position during the period of delivery of a mold charge to the forming unit and later is moved to its uppermost position for the purpose of compacting the glass and completing the blank forming operation. Themechanism for operating the plunger 31 includes two vertical piston motors, one operating to raise the plunger and its holder to the initial or lowermost operating position while the other motor constituting a part of the holder is designed to project the plunger into its uppermost position for the purpose of compacting the glass.

More specifically the construction includes a holder 61 (Figs. 7 and 13) embodying a vertical cylinder 62 having a reduced sleeve extension 63 or finish ring at its upper end designed to partially enclose the plunger 31 and function as a guide therefor. This sleeve extension also centers the plunger in the neck mold and shapes the finish or top sealing surface of the bottle or jar. A piston 64 arranged within the cylinder 62 is connected through a rod 65 to the plunger 31. Air under pressure for raising the plunger 31 with respect to the cylinder 62 is supplied to the lower end of said cylinder by way of the pipe 66. Lowering of the plunger is obtained by introducing air under pressure into the upper end of the cylinder '62 by way of a pipe 67. A vacuum pipe 68 is conmounted. Upward movement of the piston rod 71 and plunger holder is obtained by introducing air under pressure into the lower end of the motor cylinder by way of a pipe 72. A pipe 73 is arranged to conduct air under pressure to the upper end of the cylinder for the purpose of lowering said plunger holder.

A funnel guide 74 and battle plate 75 or blow plate, are mounted upon the swinging frame 32 for cooperation one at a time with the blank mold units. For the purpose of operatively positioning the funnel guide and baffle plate mechanism is employed embodying substantially the following construction. A vertical rock shaft 76 is mounted in a tubular housing 77 extending vertically upward from the outer end of the swing ing frame 32, said rock shaft having an adjustable extension 78 at its upper end to which said funnel guide and baflie plate are in turn adjustably secured. The funnel guide and baflle plate are arranged at different elevations and in different angular positions relative to the rock shaft for reasons which will be entirely obvious. The rock shaft 76 and tubular housing 77 have a pin and slot connection with each other of such form that rocking of said shaft is accompanied by axial movement thereof. Actuation of the shaft is obtained by means of an air motor 79 which is mounted upon the outer end of the swinging frame 32 and connected through a piston rod 80 to said rock shaft 76. Air under pressure is supplied through a pipe 81 to the lower end of the motor 79 for moving the rock shaft 76 upwardly. A pipe 82 is connected to the upper end of the motor 79 to conduct air under pressure thereto for lowering said shaft. Thus it will be seen that operation of the motor 79 results in alternate positioning of the funnel guide 74 and baflie plate 4 75 in register with the charge receiving end of the body blank molds 26.

In order that a blank mold may be positively held closed during the blank forming and compacting operations, clamping mechanism embodying the following construction is employed. A pair of jaws 83 (Figs. 1 and 2) pivoted to the upper end of the tubular housing 77 are adapted to engage fingers 84 on the sections of the body blank molds 26. For the purpose of opening and closing these jaws 83 there is provided an air motor 85 supported on a bracket 86 at the upper end of said housing 77 and a piston rod 87 which together with toggle links 88 provide operating connection between said motor and jaws. An air supply pipe 89 has connection with the outer end of the motor 85 so that air under pressure may be supplied to the motor for operatively positioning the jaws 83. Inoperative positioning the jaws is obtained by introducing air under pressure into the opposite end of the motor by way of the air supply pipe 90.

Operation of the various air motors in a-predetermined order is controlled and regulated by means including a reversing valve (Fig. 4) through which air is supplied to the motors as desired. This reversing valve comprises a pair of axially aligned cylinders 91 and a piston'rod 92 extending through adjacent ends of said cylinders and carrying valves 93 or pistons; The inner ends of the cylinders 91 are connected through branch pipes 94 to a main supply pipe 95 which leads to a source of supply of air under pressure (not shown). Each cylinder 91 is provided with three outlet ports spaced apart circumferentially and lengthwise thereof. The ports in one of the cylinders are connected to pipes 59, 82, and 66 through which air is supplied to the group of air motors for operatively positioning the parts controlled thereby. The three ports in the other cylinder 91 are connected to pipes 67, 81, and 60 which lead to said group of air motors in such a fashion that air flowing through the pipes will reverse the direction of movement of the pistons therein. Reciprocation of the piston rod 92 (Figs. 3 and 4) shuts off the ports in one cylinder one at a time from communication with the source of supply of air under pressure while opening the ports in the other cylinder for communication with the source of supply of air. For the purpose of reciprocating the valve rod 92, a continuously rotating drum cam 96 having a continuous spiral groove. 9'7 therein, may be employed. An arm 98 secured to the rod 92 carries a cam roll 99 running in said groove 97. The cam drum 96 is intended to be rotated by means of a. motor 100 operating through a shaft 101 and a gear box 102, the latter containing speed reduction gearing (not shown).

Application of vacuum to the neck mold cavity for preventing the plunger from displacing glass in the neck mold is obtained by way of the'pipe 68 (Figs. 3, 7, and 12) and is controlled by a valve 103 to which a vacuum supply pipe 104 is connected. This valve 103 includes a housing 105 in which a spring pressed valve disk 106 is mounted to normally shut off communication between the pipes 104 and 68. A lever 107 pivoted to a bracket 108 on said housing 105 is operated automatically at regular time intervals to unseat said valve disk 106 so that communication is established between the pipes 68 and 104. This valve operating lever 107 is intended to be pressed downwardly to open the valve substantially simultaneously with opening of communication between the pipe 59 (Fig. 10) and the air pressure supply pipe 94 so that vacuum will be applied to the neck mold just prior to upward movement of the plunger during the glass compacting operation. Such movement of the lever 107 is obtained by a pivoted finger 109 which is connected 145 through a hinge pin 110 to a rod 111 suitably carried by one of the valves 93 or pistons. This finger 109 includes a cam 112 on its lower side with which the lever 107 is'initially engaged andby means of which said lever is pressed down- 160 wardly to open the valve. This cam 112 terminates short of the inner end of the finger 109, said finger at this point being provided with a lateral recess 113 into which the outer end of said lever 107 is projected after passing beyond the cam 112. The inner vertical wall of the recess 113 is curved and merges into a straight side wall 114 which extends to the outer end of the finger 109. A leaf spring 115 (Fig. 11) normally and yieldingly holds the finger 109 in alignment with the rod 111. Substantially at the time the valve 93 or piston (Fig. 1) uncovers the port leading to the pipe 59, the cam 112 presses the lever 107 downwardly, opening the valve 103. This valve is held open until the lever 107 moves beyond the inner end of said cam 112 where it is returned to its uppermost position by the valve spring. The outer end of the lever 107 extends into the recess 113 at the inner end of its stroke and upon reversing the direction of travel of the valve rod 92 the outer end of said lever 107 slides over the surface 114 of the finger 109 with the result that the latter swings about the vertical axis of the hinge pin 110. Upon completion of the return stroke of the finger 109 the lever 107 is again in position to be engaged by the cam 112.

In operation the mold tables are moved in a step-by-step fashion about their individual axis so that one of the blank forming units is brought to a standstill directly beneath and in register with the bottom outlet of a feeder for molten glass (not shown). Immediately and just prior to delivery of a charge of molten glass to the forming unit, the rotary cam 96 (Fig. 4) moves the valve disks 93 or pistons to the left end of the cylinders 91. Immediately after the valve 93 is moved sufiiciently to establish communication between the pipe 59 and the source of supply of air under pressure the detent 54 is raised to lock the swinging frame 32 and blank mold table 21 together. At the same time the jaws 83 (Fig. 2) are brought together to secure the blank and neck molds against premature opening and the plunger holder 61 is raised to project the plunger 31 into the mold as shown in full lines in Figs. 2, 7, and 8. At this point a mold charge is dropped through the funnel guide 74 and into the cooperating body blank and neck molds. The valves 93 continue to move to the left (Fig. 4) so that air is next delivered to the pipe 82 (Figs. 2 and 3) for the purpose of operating the motor 79 and swinging the funnel guide 74 to one side of the mold and bringing the battle plate into position to close the upper end of the body blank mold 26. With opening of the next and last port, air is supplied through the pipe 62 to the plunger holder 61 with the result that the plunger is moved to the dotted line position shown in Fig. 2 corresponding to the full line position in Fig. 9. This additional projection of the plunger is preceded by opening of the vacuum control valve 103 so that vacuum is applied to the neck mold cavity. Thus the glass will be drawn into the neck cavity and held against displacement which in the absence of vacuum might take place with the additional upward movement of the plunger 31. Prior to completion of the above steps, the blank mold table will have started its movement to the next succeeding station. In order that the plunger mechanism and its supporting frame 32 may freely move with the table without building up pressure in the motor cylinder 38 (Fig. 5) the valve 43 (Fig. 6) is positioned to establish communication between the cylinder and the atmosphere. By the time this mechanism is to start its return movement to its original position the drum cam 96 will have moved the right hand valve 93 (Fig. 4) to the outer end of its cylinder 91. This establishes communication between the pipes 67, 81, and 60 in succession with the source of supply of air under pressure, resulting first in lowering of the plunger to the full line position shown in Fig. 2, then in removal of the baffle plate 75 from contact with the mold, and last, in retraction of the detent 54, plunger holder 51, and opening of the mold clamping jaws 83. With retraction of the detent 54 the valve 43 is opened by the lever 51 so that air under pressure is supplied to the motor cylinder 37 and quickly returns the entire mechanism to its original position for cooperation with the next succeeding blank forming unit. The operations above described are then repeated.

In Figs. 14 to 17 inclusive there is shown a somewhat modified form of the invention in conjunction with a two table type of glassware forming machine differing in some respects from that shown in Fig. 1. In this modified form of machine the blank mold table supports three blank forming units 23 while the finishing mold table carries six finishing mold units 24. The mold inverting, opening, and closing mechanisms, as well as the take-out device, may be in accordance with the Lynch et al patent identified heretofore. St-ep-by-step rotary motion is imparted to the mold tables by mechanism (Figs. 15 and 16) including a piston motor 120 having a rod 121 which supports a pair of rack bars 122. These rack bars are arranged in different horizontal planes and adapted for operative engagement one at a time with a gear 123. This gear is carried by a shaft 124 which in turn is suitably mounted upon the piston 125 of a vertical air motor 126. This air motor is operated by means (not shown) to move the gear 123 up and down on the shaft 124 for alternate engagement with the rack bars 122. A gear 127 at the upper end of the shaft 124 has driving connection to a ring gear 128 on the blank mold table 21 and through a pair of smaller meshing gears drives a ring gear 130 on the finishing mold table 22 Suitable means (not shown) may be employed to regulate and control the periods of operation of the piston motor 120 so that motion will be imparted to the tables at regular predetermined time intervals.

For the purpose of periodically locking the mold tables against relative movement, locking pins 131 or detents are mounted on a cross-head 132 for upward projection into openings 133 which are provided in said tables and correspend in number and location to the mold units. These pins are moved by means of an air motor 134 which is suitably connected to said crosshead 132. Any conventional or preferred type of control means may be employed to regulate the supply of air under pressure to the motors 126 and 134.

In the modified form of plunger operating mechanism, the main distinction as compared with the first form resides in the fact that it is stationary and performs all of its functions at the mold charging station C. This mechanism includes a base 135 carrying a piston motor 136 for raising and lowering a plunger. holder 137, the latter including a piston motor which operates to move the plunger 138 up and down in the blank mold 26 A funnel guide 139 and baffle plate 140 are supported on the upper end of a rock shaft 141 which is raised and lowered by a piston motor 142 and oscillated during such raising and lowering movements by a pin and spiral slot connection between said rock shaft and the tubular guide 143. This piston motor 142 is carried by the base 135. The blank molds are adapted to be held against premature opening by clamping jaws 144 which are alternately opened and closed by an air operated piston motor 145. These elements are substantially identical in construction to corresponding elements in the form first descnibed and are connected through air supply pipes to control mechanism including a reversing valve 146 the construction of which is substantially identical to that shown in Fig. 4. A vacuum valve 147 operating in conjunction with the reversing valve 146 and corresponding to the valve shown in Fig. 12, serves to regulate and control the application of vacuum to the neck mold cavity. In this form of the invention each blank mold unit will remain at the charging station C a period of time sufficient to allow delivery of a mold charge of molten glass into and compacting of the mold charge such as is obtained by closing the upper end of the blank mold, applying vacuum to the neck mold cavity and raising the plunger 138 to the dotted line position shown in Fig. 14. Immediately thereafter the mold will be released from engagement with the baffle plate 140, plunger 138 and clamping jaws 144 and moved 129 to the blank transfer station '1 between said tables. Here the completed blank or parison will be transferred to a finishing mold 24 in which it is transformed into a finished article and from which it is later removed and placed upon a ware conveyor 25.

Modifications may be resorted to within the spirit and scope of the appended claims.

What we claim is:

1. In combination. a blank forming unit mounted for movement to mold charging and bank transferring stations in succession. said unit including cooperating body blank and neck molds having an open charge receiving end, a plunger at the other end projecting into the neck mold and cooperating therewith to form a neck cavity, means for positioning said molds at the r charging station with the open end facing upwardly to receive a mold charge of molten glass. a battle plate arranged to close said open end after the mold charge has been delivered to the mold, means for projecting the plunger upwardly into the mold after the mold charge has been delivered to and during a portion of the travel of the mold between the charging and transferring stations, and means for then separating the plunger and bafile plate from said molds and returning them to the mold charging station.

2. In combination, an annular series of partible blank molds mounted for movement in a closed horizontal path, means for mov ng the molds in a step-by-step fashion and bring them to a standstill at a mold charging station each mold having an open charge receiving end facing upwardly at the charging station, a rotatable mold table supporting said molds, a frame arranged below the molds for oscillation about the axis of rotation of said molds, a plunger carried by said frame, automatic means for positioning the plunger in one end of each mold during the charging operation and for a period of time thereafter, means for securing said frame and table together at times whereby the latter is moved with the molds a predetermined distance beyond the charging station, a balile plate carried by said frame and adapted to close the open end of the mold immediately after the charging operation, means for projecting the plunger upwardly after the mold has been closed and during a portion of its travel subsequent to the mold charging operation, and means for separating the plunger and frame from the mold and mold table respectively for return to the mold charging station.

3. In combination, a mold table mounted for rotation about a vertical axis, a series of blank forming units thereon, each unit including a partiole cooperating body blank and neck molds, means for moving the table in a step-by-step fashion to thereby bring the mold units to a standstill at a mold charging station, the body blank mold having an open end facing upwardly at the charging station to receive a mold charge of molten glass, a frame arranged in a plane below said molds and mounted for oscillation about the axis of rotation of said table, means for oscillating the frame along a path one end of which terminates at the charging station, a plunger carried by the frame, means for operatively positioning said plunger in the neck molds of said units as they are brought in succession to and moved beyond the charging station, means for closing each mold after the charging operation, means for then applying vacuum to the neck mold cavity, and means for projecting the plunger upwardly to compact the mold charge while vacuum is still applied to the neck mold cavity.

4. In combination, a mold table mounted for rotation about a vertical axis, a series of blank forming units thereon, each unit including partible cooperating body blank and neck molds, means for moving the table in a step-by-step fashion to thereby bring the mold units to a standstill at a mold charging station, the body blank mold having an open end facing upwardly at the charging station to receive a mold charge of molten glass, a frame arranged in a plane below said molds and mounted for oscillation about the axis of rotation of said table, means for oscillating the frame along a path one end of which terminates at the charging station, a plunger, a vertical piston motor comprising a holder for the plunger, a piston motor mounted on said frame for raising and lowering said holder and plunger to thereby periodically position the plunger in the neck mold, a baflle plate for closing one end of each body blank mold following the mold charging operation, a piston motor for then actuating the holder to project the plunger upwardly into the body blankmold to compact the glass against the mold cavity walls and baffle plate, and means for applying vacuum to the neck mold prior to and during upward movement of the plunger.

5. In combination, a blank mold table mounted for rotation about a vertical axis past a charging station, a series of partible blank molds thereon, means for imparting intermittent movement to the table whereby the molds are brought to a standstill at the charging station, a frame mounted for oscilfation about the axis of said table and beneath the molds, one end of the path of oscillation being located at the charging station, a plunger holder mounted on said frame, a plunger carried by the holder, a finish ring encircling said plunger, means for raising the holder and thereby placing the plunger and ring in position for cooperation with one end of the blank mold, a baflleplate carried by said frame, means for.. p'1aing the baflle plate "over; thlj'othe'r Ien'd of theib'lank moldpafter a mold. chargevot 'molten glass has been deliveredlt'o the mold, means for then ,efiecting relative movementfbetween the. plunger and blank mold to compactthe igl'ass against themold cavity waLls andbafile plate, ,automatic means carried by. the frame for holding the mold against premature opening, ma a piston'motor for oscillating said frame whereby it is caused to travel with the molds a predetermined distance beyond the .chargingfstafnzm and then return to said station.

6. In'comb'ination, an annular series of blank ,fomiingunits each including cooperating bod, blank and neclrmolds, meansfor impartingin- Ltermittent rotation to the units whereby' they "arefl successively brought to a standstill at a charging station, said .body; .blank mold; having .an open end facing Qupwardly at the Icharging .Jstatio'n, a plungerficommjonltoiall oftheflblank forming. units, a. plunger carrier mounted below .said units for oscillatory movement about the axis of rotation of: the latter, .means forrnoying the plunger carrier forwardly in register with the v molds from thechajrging st'ationa' predetermined distance, means for movingfthe. plunger intoand out of theneck-moldgjmeans Ior further projct- 5 ing the plunger after. the'charging operationto thereby' compact the glass iii-the mold, .means for. closing the open upperwend of theinoldduring the glass compacting operation, and-means for applying vacuum to the, neck mold during the compacting operation] LEONARD -D. SQUBIER. JQHN E. COLLINS.

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