US1879684A - Glassware forming machine - Google Patents

Description

Sept. 27i 193;

O. C. K. HUTCHlNSON ET AL v GLAS SWARE FORMING MACHINE Filed July 29. 1929 2 Sheets-Sheet 1 l gwoenkou, y lifffufcifwofa,

atkowuj Sept- 27, 1932- o. c. K. Hu'rcHlNsoN ET AL 1,879,684

GLASSWARE FORMING MACHINE Filed July 29. 1929 2 Sheets-Sme?l 2 Patented Sept. 27,. 1932 `UNITED STATES PATENT oEFlcE OLIVER, C. K. HUTCHINSON, OF ALTON, ILLINOIS, AND JOHN`E. MCLAUGHLIN AND LEONARD D. `SOUBIER, OF TOLEDO, OHIO, ASSIGNORS TO OWENS-ILLINOIS GLASS COMPANY, OF TOLEDO, OHIO, A. CORPORATION OF OHIO GLASSWARE FORMING MACHINE Application filed July 29, 1929. Serial No. 381,782.

The.presentinvention relates to improvements in glassware forming machines and more particularly to means by which formation of the usual cutod scar on the bottoms of articles of glassware, such as bottles and jars, may be materially reduced, if not entirely avoided.

In glassware forming machines embodying suction blank molds, it is standard practice to sever m'old charges of glass in the molds from a supply body of the molten glass, by means of knives which are moved laterally across the lower ends of the molds after each charging operation. Each cutoff 'knife includes a closure plate which moves along a path at right angles to the axis of the mold cavity and is brought into position to close the lower end of the moldl immediately following severence of the charge of molten glass from the supply body. Whenthe clo sure plate is in position to close the lower end of the mold cavity, it forms with the lower end of the cavity wall a relatively sharp corner which chills the glass around the margin of the lower end of the blank to such depth that it cannot be reheated sutciently prior to final expansion of the blank to avoid the formation of a scar in the {inished article. This deep chilling of the glass is inpart due to the necessarily comparatively cool knife, but mainly to the fact that the wall of the cavity and the upper side of the cutoff knife are disposed approximately at right angles to each other, with the result that the glass around the lower margin of the blank is subject to chilling on two sides.

An object of the present invention isto overcome the objection above pointed out and to provide means by which chilling of the Other objects of our invention will be in part apparent and in part pointed out hereinafter.

In the drawings: v

Fig. l-is a sectional elevation of a charge gathering unit embodying our invention.

Fig. 2 is a detail sectional elevation showing the cups or recesses in register with the mold cavities, just after completion of 'the mold charging operation.

Fig? is a fragmentary elevation showing the cups lowered away from the mold.

Fig. 4 is a fragmentary plan view of the knife, showing the arrangement of the cups therein.

Fig. 5 is a detail sectional view illustrating the manner in which the blanks or par/isons are chilled by apparatus of standard construction.

Fig. 6 is a detail view showing our recessed cutoff knife, which avoids 4undesirable chilling ofthe blank.

Figs. 7 to 11 inclusive, illustrate another form of cutoff knife embodying the cups or recesses. v v

Fig. 7 is a fragmentarv front elevation.

Fig. 8 is a fragmentary sectional view taken along the line VIII-VIII of Fig. 10, showing the mold and cutoff while gathering a charge of molten glass.

Fig. 9 is a view similar to- Fig. 8, taken along the line IX-IX of Fig. 11, showing the relative positions of the mold andknife after the charge severing operation.

Figs. 10 and 11 are sectional plan viewsy showing the cutoff knife in the positions occupied prior to and following the charge severing operation, respectively.

In Figs. .1, 2, 3, 4 and 6 illustrating one embodiment of our invention',a single'head 12 of a forming machine is shown, said head including a frame carrying a suction gathering moldl 13 and neck mold 14, the latter connected to a vacuum chamber 15. The mold.

13 is formed with a cavity which opens through its lower end. When the mold is brought into contact with the glass 17, the I air is exhausted from said cavity and replaced by a measured quantity o f said molten glass. Exhaust of air from the mold cavity is controlled by a valve 18 in said vacuum chamber v15, the valve being operated at regular time formed on an arm 22, extending to one side of and from said vacuum chamber 15.V This shaft is oscillated and reciprocated at regular time intervalsby rack and pinion mechanism 23 and a forked lever '24, respectively, in the usual manner. The foregoing is ordinary "structure and for additional details relative to actuation of the cutoif mechanism, reference may be had to LaFrance Patent 1,185,- 687, dated June 6, 1916.,

In order to prevent excessive chilling of the glass about the margin of the lower ends of' the blanks as referred to above, the cuto is provided with a pair of recesses 26 or vacuum cups, which are formed' in the upper side of the vclosure plate 25 and adapted vto register with the mold cavities and form extensions thereof at regular time intervals. Each cup 26 includes a substantially fiat bottom 33 connected around its margin to side Walls 32 which are curved transversely of their length' substantially throughout their height. Thus, the formation of a right angle or relatively sharp corner at the juncture of the bottom and -side walls of the cups is entirely avoided, with the result that the glass around the lower margin of the blanks is chilled only to the same depth as the remaining surfaces. Even distribution of glass in the lfinished article is one result of such uniform chilling. Ordinarily the cavity wall 34; (Fig..5) and upper face 35 of the cutoff knife provide a relatively sharp corner into which the lower margin 36 of the blank is pressed and deeply chilled. This portion cannot be suilicientlyv reheated prior to finalfblowing of the blank to avoid presence of .the scar in the bottom of.. the finishedarticle. Accordingly, the bottom of the finished article is unsightly and weaker than the remaining structure.

Air is exhausted from the cups while in register with the cavities ,to cause the blanks to extend -into said cups. Such removal of' air from the cups 26 is obtained'by connecting them through verticalslots 27- and conduits 28 to an axial passageway 29 in the y rock shaft 20, saidpassageway adapted for communication at regular time intervals with the vacuum chamber 15.- Perlodlc communi-- cation betweenthe assageway 29 and the vacuumchamber 15 1s obtained by providing lviding 'a shearing edge 40 at the upper end of a port 30 (Fig. 1) i extending radially from the upper end of said passageway and adapted to register Owith one end of a conduit 31 in the arm 22, said conduit leading to the vacuum chamber 15. When'the cutoff knife is in a plane to swing laterally across the lower end of the mold, the port 30 is horizontally aligned with the adjacent end ofthe conduit 31. With lateral movement of the knife and partial rotation of the rock shaft 20, this port 30 is brought into register with said end of the vconduit 31, with the result that air is exhausted from the recesses 26 or cups. By exhausting the air from these cups, a portion of the glass inthe mold 13 is moved lengthwise of the cavities 16 and completely fills the cups 26 as stated above.

In operation, the mold 13 is brought to a charge gathering position, as shown'in Fig. 1, where measured quantities of molten glass are drawn into the cavities 16 by suction. The mold is then lifted and the cutoff swung laterally across the lower end of the mold by operation of the rack and gear, mechanism 23. This movement of the knife severs the glass in the mold cavities from the supply body 17 and brings the recesses or vacuum cups 26 into register with said mold cavities. Such movement of thevknife also positions the port' 30 (Fig. 1) so that the air may be exhausted fromsaid Vacuum. cups 26 to cause downward movement of the glass in the blank mold to fill said cups. Incidentally, thisa exhaust of air from the cups tends to bring the adjacent surfaces of the closure. plate 25 and blank mold 13 into exceptionally snug contact with each other, resulting in elimination of the iin of glass which is frequently found just above the lower corners of bottles and jars.

' In" another form of the invention, Figs. 7 to 11, inclusive, the cutoff comprises a plate 37, mounted at the lower end of a rock shaft 38 and adapted to be positioned beneath the mold 13 during gathering of charges of molten glass from the supply body 17. The plate 37 is provided with a pair of vertical' openings 39, which are brought'into register with the mold cavities 16 prior to movement of the mold into a charge gathering position. When `the airis exhausted from the .mold

cavities, measured quantities of molten glassare drawn into the mold cavities by way of said openin s or passageways 39. Lateral movement o the plate 37 relative to the mold severs the mold' charges from the supply body and closes the lower ends of the cavities. Severance of the glass is obtained by pro-1 each opening 39 to cooperate with the lower end-1,1 of thewall of each mold cavity. A pair of recesses 42 -or` cups formed in -the upper side of the -p1ate'37 are brought v into register with the lower ends of the mold l cavities, due to lateral movement of said F39 plate, and form extensions of the cavities as 1n the previously described form. These recesses or cups 42 are connected through vacuum slots 43 and conduits 44 in the cutoi arm 45 to a passageway 46 extending lengthwise of the rock shaft 38, said passageway being adapted to communicate at regular time intervals with the vacuum chamber 15 by way of the port 30 and conduit 31. In this form (Figs. 8 and 9), the vacuum cups or recesses 42 are hemispherical in shape so that the formation of angularly disposed surfaces for contact with the lower margin of the glass blank is avoided. Y i

. In operation, the plate 37 is positioned as shown in Figs. 7, 8 and 10, while the molten glass is being introduced into the mold cavities. Lateral movement of the plate severs the mold charges from the supply body andy brings the vacuum cups or recesses 42 into reg1ster with the mold cavities, as shown in Figs.` 9 and 11. By exhausting the air :from said cupswhile in register with the mold cavities, portions of the glass are drawn downwardly to till said cups substantially as shown in Fig. 9. Thev plate 37 is moved downwardly .away from the mold after giving the lower end ofthe blanks the shape shown in Fig. 9. Such movement of the plate is effected by mechanism such as the fork 24 in Fig. 1, and actuating mechanism such as illustrated` in the La France patent identied above.

Through the use of construction 4substantially as described herein, the formation of the usual prominent cutof scar in the bottoms of bottles and the like containers is avoided. Accordingly, the appearance of the bottoms of the ware is improved and the containers are better able to withstand high internal pressures. l

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

What we claim is:

1. The combination of Va mold havinOr a cavity opening through one end thereof, a closure plate having a recess in one face thereof, a `knife secured to said plate, means for .introducing glass into the mold through said opening, and plate across the end of the mold and thereby s vering the glass and bringing said vrecess into register with the mold-opening, and means for 'exhausting the air from said recess substantially simultaneously with its movement into register with the mold openin g and thereby drawing glass from the mold cavit to lill said recess.

cavityyopenin 4 through one end thereof, aj closure Aplate avmg a recess 1n one face i thereof, a knife secured to said plate, means for introducingglass into the mold through said o ning, means for swinging the knifev and p ate 'across the end of the mold and means for swinging the knife e combination of a mold lhaving a cavity to fill said recess, t e'edges of the said recess and mold opening being substantially coextensive'and coincidlng when the closure plate is in said position of registry with the mold, the wallsl of said. recessbeing curved to form a rounded end on the parison formed in the Imold cavity and recess without an angle at the meeting edges of the mold opening and said recess.

3. The combination of a suction gathering mold open at one end, means for introducing molten glass by suction into the mold through said end, means for severing the glass at said end, a closure plate having a cup cavity therein, means for moving said-y plate into a mold 'closing position in which said cavity is in moving said plate into position to cause said opening to register withthe mold cavity, suction means'for drawing molten glass through said opening and filling the mold cavity, means for then moving said closure plate laterally to sever the glass and bring said recess into register with the mold cavity, and means for exhausting the air from said recess substantially simultaneously with its movement into register with the mold cavity.

5. The combination of a suction gathering mold opening downwardly, a rock shaft, a rock arm carried thereby, a mold closing plate carried by said arm, means providing a cutting edge carried on said plate, said plate having a recess in its upper face, means for introducing a charge of glass suction into the mold through the lower open end thereof. means for rocking said shaft yand thereby moving the cutting edge across the mold for severing the glass and bringing said recess into register. with said open end of the mold.v said rock1 shaft, arm and plate being formed with a channel lextending therethrough and communicating with said recess, and automatic means actuated by said movement of the ,rock shaft to open said channel to a source vun of vacuumandthereby .exhaust the air from said recess concomitantly with the movement of said recess into register with the mold opening and thereby exhausting the air closureplate having a recessin one face thereof, aknife attached to said plate, means for introducing a charge of glass into the mold through said opening, means for swinging the knife and plate across said end of the .mold and thereby severing the glass and bringing said recess into register with the moldv opening, a vacuum line extending to said recess, and automatic means for connecting said line to a source of vacuum sub- .stantially simultaneously with the movement of said recess into register with the said mold opening and thereby exhausting the air from said recess and causing glass from the mold cavity to enter and ll said recess. l Y

7. The combination of a mold having a cavity opening through one end thereof, a closure late having a recess in one face thereof. a ife attached to said plate, means for introducing a charge of glass into the. m old through said opening, means for swinging the knife and plate across said end of the mold and thereby severing the glass and bringing said recess into reglster wlth the mold opening, a vacuum line extendmg to said recess, and automatic means for connecting said line to a source of vacuum substantially simultaneously with vthe movement of said recess into register with the said mold from said recess and lcausing glass from the mold cavity to enter and ll said recess the edges of said recess and mold opening belng substantially coextensive. and coinciding when the closure plate is in said position of registry with the mold, the walls of said recess being curved to form a rounded end on the parison which is formed in the mold cavity and said recess, without an angle at the meeting edges of the mold cavity walls and the walls of said recess.

8. The combination of a suction gathering mold open at one end, means for introducing molten glass by suction into the mold through said end, means for severing the glass at said end, a closure plate having a cupcavityfthere-- in, means for moving said plate into a I nold closing position in which said cavity 1s 1n register with the mold opening and the `meeting edges of the mold openin' and cup cavity coincide and are s'ubstantia ly coextensive, a vacuum line extending to said cavlty, and automatic means for connecting said line to a source of vacuum substantially simultaneouslywith said lmovement of the cup cavity into said osition of registry with the mold and there y causing movement of glass from the mold into the cup cavity.

9. The combination of a mold open at one end to receive a charge o f glass, a closure plate therethrough and a recess having an openin e of said, opening, means therein at oneV s i for moving said plate into position to cause said recess into register with the mold cavity,

means providing a vacuum line extending tQ said recess, and automatic means for connectin said line to asource of vacuum substantia ly simultaneously with the bringing of said recess into register with the mold cavity and thereby exhausting the air from said recess and causing a ortion of the charge of glass to enter and lili) said recess.

10. The combination of a suction gathering mold open at one end, means for introducing molten glass by suction into the mold through said end, a closure plate, a knife, means for moving the knife across `said open end of the mold and severing the glass and -open end of the mold by said movement of the plate, and pneumatic means brought into activity by said movement of said plate and substantially simultaneouslywith the registration of said recess with the o n end: of the mold for causing ressure o said plate against the mold and simultaneously causin a movement of glassfrom the mold into sai recess.

12. The combination of a suction gathering mold open at one end, means for introducing molten glass by suction into the mold through said end, means for severing the glass at said "end, a 'closure plate having -a cup cavity therein, means for moving said plate into position to close said end of the moldwith said cup cavity in register with the mold opening, and automatic means controlled by the movement of said late into said position to cause a portion of t e glass in the mold to las:

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