US2215980A - Method of burning off glassware - Google Patents

Description

Sept. 24, 1940. C w, $HRE|BER 2,215,980

METHOD OF BURNING OFF GLASSWARE Filed April 7, 1939 3 Sheets-Sheet l C. WJc/axeiher INVENTOR.

Sept. 24, 1940. c. w. SCHREIBER METHOD OF BURNING OFF GLASSWARE Filed April 7, 1939 3 Sheets-Sheet 2 IN V EN TOR. C W ,cizrjezer' M 7 A TTOR S.

Sept. 24, 1940. Q w, SCHREBER 2,215,980

METHOD OF BURNING OFF GLASSWARE Filed April 7, 1939 I 3 Sheets-sheaf. 3

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Patented Sept. 24, 1940 PATENT OFFICE.

METHOD OF BURNING OFF GLASSWARE Carl W. Schreiber, Toledo, Ohio, assignor to Libbey Glass Company, a corporation of Ohio Application April 7, 1939, Serial No. 266,578

2 Claims;

The present invention relates to a method of and an apparatus for burning ofi glassware and more particularly to the type of apparatus shown and described in the patent to Parker No. 1,577,- 538, dated March 23, 1926, wherein the article is held substantially stationary while the burner is moved relative thereto during the burning-01f process.

The invention is designed as an improvement over the apparatus disclosed in the Parker patent in that means is provided for stretching the wall of the article in the region of the severing flame to avoid the formation of a bead on the rim of the article after the moil is severed from the article.

This being the principal object of the invention, other objects thereof will become apparent as the following description ensues.

In the accompanying drawings:

Fig. 1 is a vertical sectional view taken longitudinally and centrally on a vertical plane through an apparatus embodying the principles of the present invention; 7

Fig. 2 is a sectional view, diagrammatic in its representation, of a valve structure and an associated burner structure with the former in position for applying cooling air to the stretched wall of a tumbler;

Fig. 3 is a diagrammatic view similar to Fig. 2 with the valve structure in the position it occupies during the actual burn-off operation;

Fig. 4 is a diagrammatic view similar to Fig. 2 with the valve structure in position for flame treating the finished edge resulting from the burn-off operation;

Fig. 5 is another similar diagrammatic view illustrating. the tumbler and moil discharge;

Fig. 6 is an enlarged sectional view taken centrally and vertically through the valve structure;

Fig. 7 is an enlarged sectional view taken centrally and vertically through the burner structure; 6

Fig. 8 is a fragmentary sectional view taken through a tumbler wall illustrating the relative regions at which the tumbler wall is stretched and at which the tumbler is severed from the moil; and

Fig. 9 is a fragmentary sectional view similar to Fig. 8 illustrating the manner in which the stretched wall is burned through.

Referring now to Fig. 1, the apparatus infrom the table 20. The lower ends of the columns 24 are united by a cross-piece 25.

A bracket 26 depends from the rear side of the table 20 and provides a bushing for a shaft 21. The shaft 21 constitutes the main driving shaft for the machine and has mounted thereon a cam wheel 28 having a cam groove 29 therein. The bracket 26 is provided with a depending extension 30 carrying a rock-shaft 32 at the lower end thereof and upon which there is fulcrumed a lever 3|. A roller 33 is mounted on the rear end of the lever 3| and operates in the cam groove 29. The front end of the lever 3| is connected by a link 34 to the article support 22. The link 34 is directly pivoted to a block 35 which slides vertically in a guideway 36 provided in the article support 22. A pin 39extends upwardly from the block 35 and is surrounded by a coil spring 40.

The article is directly supported upon a perforated plate 4| mounted on the support 22 and a guide ring 42 surroundsthe article and is supported by arms 43 extendingupwardly from the support 22. A vacuum chaniner 44 is provided in the support 22 beneath the perforated plate 4| and is connected by a flexible hose 45 with the inlet side of a valve casing 46.

A pipe 41 leads from the casing 46 to a suitable source of vacuum such as a vacuum pump (not shown). The passage through the valve casing 46 is controlled by means of a valve having a stem 48 which is normally urged upwardly to close the valve by means of spring 49 surrounding the stem. The article support 22 carries a lug 56 designed for contact with the stem 48 when the support is in its lowermost position as will be described hereinafter.

A column 5| extends upwardly from the table 20 and is provided with a cross-piece 52 at the upper end thereof. Pulleys 53' are rotatably mounted on the cross-piece 52 and a cable 53 passes thereover. A weight 54. is attached to one end of the cable 53 and the other end of the latter is connected to a rod 55 which is suspended from the cable. A moil clutch 56 is secured to the lower end of the rod 55. The moil clutch 56 the column 5| and includes a central valve core 59 (see also Figs. 2 to 5 inclusive) and a surrounding valve sleeve 80. The core 59 is slidably disposed in the sleeve 60 and is vertically slidable on the rod 55 while the sleeve 60 is vertically slidable in the bracket 58. The upper end of the sleeve 60 is closed and a spring 0| surrounds the rod 55 and normally urges the core 59 downwardly and the sleeve 50 upwardly, or in other words, in opposite directions relative to each other. The lower end of the core 59 projects through the sleeve 60 and is supported upon a collar 62 mounted on the rod 55.

Movement of the sleeve 50 in the bracket 58 is controlled by means of a cam 63 which engages a roller 64 rotatably supported at the upper ends of a pair of standards 55 (see also Fig. 6) mounted on the upper end of the sleeve 00. The cam 63 is mounted for rotation at the outer end of a bracket 66 carried on the column 5| and is driven continuously through a train of driving mechanism including bevel gears 61 and 58, a

' shaft 69, and bevel gears I0 and II, the latter gear being mounted on the driving shaft 21.

Referring now to Figs. 1 and 7, the burner2| includes upper and lower stationary carriers I2 and 13, the latter being integrally formed with the table 20 and the former being secured to the latter. Bolted together as at H and thus being secured together for rotation as a unit is an upper air ring 15, a spacing ring 19, an inner oxygen-fuel gas ring I1, and a. lower supporting ring I8, the latter having teeth 19 formed on the periphery thereof. The burner unit 15, I5, 11, 18 is driven from the shaft 21 through a train of driving mechanism including bevel gears 80- and 9|, vertical shaft 92, chain and sprocket mechanism 83, vertical shaft 84 and gear 85, the latter meshing with the teeth I9 on the supporting ring 18.

An air conduit 86 leading from the valve 51 extends into the upper carrier 12 and communicates through a passage 81 with an annular space 88 or groove formed in the lower side of the air ring 15. A series of radial passages 89 connect the space 88 with an annular air chamber 90 the inner wall of which is provided with a series of apertures or air jets 92 by means of which cold air is adapted to be directed against the stretched wall of the tumbler as will be apparent presently.

An oxygen conduit 93 and a fuel gas conduit 90 extend into a union 95 which in turn extends into the carrier 13 and communicates through a passage 96 with an annular space 91 or groove formed in the underneath side of the lower supporting ring 18. A series of passages 98 connect the space 91 with an annular mixing chamber 99 provided in the oxygen-fuel gas ring 11. The inner wall of the chamber 99 is perforated to provide a series of jets I00 by means of which flame is directed inwardly against the tumbler wall to sever the tumbler from the moil as will presently appear.

Referring now to Figs. 1 and 6, the valve core 59 is formed with an annular groove I 0| designed for communication with a pair of ports I02 and I03 formed in the valve sleeve 60 when the core 59 is retracted in the sleeve 50 with the coil spring 6| compressed as shown in Fig. 2. The port I02 communicates with a conduit I04 leading from a source of compressed air while the port I03 communicates with the air conduit 93 leading to the burner 2|.

The groove IOI in the core 59 is also designed for communication with a pair of ports Ill and I00 formed in the sleeve 00 when the core 50 is in its extended position with the spring 9| extended as shown in Figs. 3 and 4. The port I05 communicates with a conduit I01 leading from a source of oxygen supply while the port I06 communicates with the oxygen conduit 98 leading to the burner.

A moil pan I08 is provided for receiving the burned oif moil as shown in Fig. 5 and is capable of being swung to the position indicated in Fig. 1 to discharge the moil therefrom in the manner set forth in the Parker patent previously mentioned.

The operation of the apparatus is as follows:

With the parts in the position shown in Fig. 1, an article resting on the article support 4| is positioned within the burner 2| with the moil clutch engaging the moil portion thereof. Vacuum is applied to the chamber 40 through the conduit 45 to hold the article on the support 4|- The roller 84 which, together with the cam 69, controls the movements of the valve sleeve 50 is in engagement with a high portion of the cam and thus the sleeve 60 is depressed. The wall of the article being comparatively cool and rigid is not yet susceptible to stretching and consequently the valve core 59 is in its lowermost position and is extended with respect to the relative positioning of the sleeve. The annular groove ml is therefore in communication with the ports I05 and I05 and oxygen is conducted from the conduit I01 through the valve 51 and conduit 93 to the burner to be mixed with fuel gas issuing from the conduit 94 and supplied to the jets I00.

During movement of the cam 63 from the angular position shown in Fig. 1 to the angular position shown in Fig. 2, the roller travels on a relatively high circular portion of the former and during this time the burner 2| continues to direct the jets 100 of flame against a localized area of the article wall as shown at a in Fig. 8. As soon as this localized area becomes softened under the influence of heat, the weight .50, acting through the cable 53, rod 55 and moil clutch 56, causes the article wall to be stretched, thus drawing glass upwardly from the region of localized heating as shown in Fig. 8. The extent of such drawing and stretching operation is determined by the travel of the valve core 59 in the sleeve 60 and at such time as'the core is fully retracted therein as shown in Fig. 2, such stretching will terminate.

As shown in Fig. 2, movement of the core 59 upwardly in the sleeve 50 causes the groove to move out of register with the ports I05 and I00 and into register with the ports I02 and I09. Thus the supply of oxygen to the burner 2| is discontinued and air is admitted to the jets 92 thereof from the conduit I00, through the valve 51 and conduit 86. Such air serves to chill and set the stretched portion of the article wall. During the chilling operation, the discontinuance of the oxygen supply to the burner 2| causes the flame to become ineffective although still present in the jets I00.

As the cam 63 continues to rotate the roller 64 encounters a relatively low region of the cam as shown in Fig. 3, and thus the valve sleeve 80 is moved upwardly relative to the core 59 so that the groove I0| in the latter again registers with the ports I05 and I05. The stretched portion 11 of the article wall having previously been cooled and consequently set, renders the weight 54 ineffective to cause further stretching thereof and CJI consequently the valve core 59 will remain stationary instead of following the upward movement of the valve sleeve 60. As soon as the groove H in the core 59 again registers with the ports I05 and I06, the flame is intensified by the admission of oxygen to the burner and localized heat is applied to the region a of the article wall and the tumbler is severed from the moil, as shown in Fig. 4.

Immediately after severing of the article in the manner previously described, the moil clutch 5B is elevated under the influence of the weight 54 until the clutch engages the stationary guide or abutment 56'. At such time, the spring 6| serves to maintain the core 59 extended from the sleeve as shown in Fig. 4 in order that the supply of oxygen to the burner may be continued long enough to glaze the thin edge of the tumbler, as shown additionally in Fig. 9.

Shortly thereafter the roller 64 engages an intermediate region of the cam 63 and the sleeve is partially depressed in such a manner that the groove IOI registers with neither the ports I02, I03 nor the ports I05, I06. The supply of air and also of oxygen is thus terminated as shown in Fig. 5, the article support 22 is lowered, and

the moil pan I08 is swung beneath the moil clutch 56 to receive the moil thereon.

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

I claim:

l. The method of burning off hollow glassware which consists in applying a flame to a localized circumferential region extending around the ware to soften the glass in said region while simultaneously elongating the article a predetermined degree to stretch the softened glass and diminish the thickness thereof, directing a blast of cooling air against the softened glass to chill and set the same, and thereafter applying a cutting flame to the chilled glass.

2. The method of burning off hollow glassware which consists in applying a flame to a localized circumferential region extending around the ware to soften the glass in said region while simultaneously elongating the article a predetermined degree to stretch the softened glass and diminish the thickness thereof, chilling the softened glass of diminished thickness, and thereafter applying a cutting flame to the chilled glass.

CARL W. SCI-IREIBER.

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