US1243023A - Bait for glass-drawing apparatus. - Google Patents

Description

W. WESTBURY.

BAIT FOR GLASS DRAWING APPARATUS.

APPLFCATIQN- FILED MAY lswsue.

1,243,023; Patented 00. 16, 1917;

WILLIAM WESTBURY, 0F OKMULGEE, OKLAHOMA.

BAIT FOB GLASS-DRAWING- APPARATUS.

eas es.

Specification of Letters Patent.

Patented Get. to, 1917..

Application filed May 13, 1916. Serial No. 97,453.

To all whom it may concern:

Be it known that I, WILLIAM WESTBURY,

a citizen of the United States, residing at Okmulgee', in the county of Okmulgee and State of Oklahoma, have invented certain new and useful Improvements in Bait for Glass-Drawing Apparatus, of which the following is a specification.

This invention relates to glass cylinder drawing apparatus, and more especially to a novel bait and means for operating the same, my object being to produce mechanism whereby a cylinder can be pulled without forming thereon the customary contracted upper end or neck, and which is therefore of uniform diameter from the bait downward to the bath of molten metal 01' glass from which the cylinder is'pulled.

'With this object in view the invention consists in certain novel and peculiar features of construction and combinations of parts as hereinafter described and claimed; and in order that it may be fully understood reference is to be had to the accompanying drawing, in which- Figure 1, is a view partly in elevation and partly in vertical section of a glass drawin apparatus embodying my invention.

Fig. 2, is a plan view of the same with the drum omitted.

Fig. 3, is an enlarged central vertical section of a modified form of the bait.

In the said drawing, where like reference characters identify corresponding parts, 1 is a glass tank or furnace, and 2 the dog house or forehearththereof, though it is to be understood that the bait apparatus will operate in conjunction with a pot or any other molten glass holding device as well as with the dog house or forehearth shown.

The doghouse or forehearth is provided with the customary top opening 3, through which the pulling operation takes place, as hereinafter explalned.

The blowing apparatus is omitted as forming no part of the invention, as any type of blowing apparatus may be employed.

' Arranged adjacent and above the dog-. house is a vertical guideway consistm of a pair of parallel bars 7, and mountec to travel upwardly and downwardly thereon is a carriage 8, the same being connected by cable 9 with a drum 10, adapted for operation by any suitable means, not shown, operation of the drum in one direction lowering the carriage and in the opposite direction raising the same.

The bait consists of two members, the body portion or member consisting, of a circular ring or annulus 11, which curves downwardly and inwardly to form an upwardly facingshoulder 12, and at the upper end the body portion or memberis internally 'threaded at 13 and screwed into said 'memher is a substantially horizontal ring 14. The body portionat its junction with the shoulder 12 is formed with an annular rib 15, and thering 14 is secured to the lower ends of a pair of upright rods 16, connected ata suitable point by a cross brace 17. 18 is a pair of collars secured on the upper ends of the rods and provided with outwardly projecting arms 19, engaging strap eyes 20, depending from the carriage 8. From this construction it will be seen that the body portion of the bait moves upward and downward with the carriage, it being also noted by reference to Fig. 1, that the bait is ca: pable of passing through the opening 3 of the dog house, and being partl'y submerged;

in the molten metal therein.

21 constitutes the other member'of the bait, the same being in ,the form of a ring or annulus which may lie within the body portion or member as shown in Fig. 1, or fit around said member as shown in Fig. 3. In both cases the member 21 conforms generally to the curvature of shoulder 12 and is disposed concentrically of and spaced slightly from the same, the lower margin of the ring member 21 being lreversely curved or bowed at 22 around the lower extremity or margin of shoulder 12 so that there shall be no sharp angles or bends in the, space between the members, and to dispose and hold the members in the relation described, the ring member is provided with a marginal flange 23, which rests upon the annular rib 15 of the other member.

The ring member is secured to the lower ends of a pair of bars 24 fitted on hooks 25 attached to the lower ends of a pair of cables 26 suspended from a cross rod 27 normally resting on the carriage 8, for example as shown in Fig. 2, it being apparent by reference to Fig. 1, that in the downward movement of the carriage to dispose the bait in the molten metal or glass, the ends of the rod 27 will en age stop bars 28 secured to the guide bars or in fixed relation thereto, 110

Ill-5 10 formed to facilitate the pulling operation,

- as customary. Immediately after the ai'r is turned on, as explained, the hoisting mechanism is operated to. pull the bait upward,

and by the time the carriage has again come into engagement with the rod' 27 the ring member 21 of the bait is again resting on the rib 15 with the space between the two members filled by a flange of glass on the upper end of-the cylinder, it being apparent 2 0 that because the bait is in the form of a a large annulus the temperature of both members and the glass flange between them will be substantially -uniform, and-there willbe no dangerof fracture of said glass flange 25 due to'any unequal expansion between the tw members. It has been found in practice that with a large bait as shown, the molten glass will not adhere to the bait as it starts upward unless the upper bait member 21 is employed to retain the glass upon'the shoulder 12 of the member 11 before the I glass-hardens sufliciently to retain its grip on the bait. 1 When the cylinder is drawn to full length,

' its connection with thebath is broken in any suitable manner, and aftertheconnection is broken the. hoisting mechanism is operated until the lower or free end of the 40 The lower end of the cylinder may then'be engaged with the usual yoke and tackle mechanism and swung upward and at the same time the carriage is lowered, it ,being understood that the pins or arms 19 will i5 constitute the fulcrum points in the pivotal movement of the cylinder. When the carriage is lowered suficiently, an operator 7 grasps the bait or the rods 16 thereof, and disengages the arms 19 from (the strap eyes or hooks 20, this manipulation incidentally efi'ecting the automatic disengagement of 1' the bars 24 from the hooks 25, as said hooks are arranged to f-acein the same direction I as thestrap eyes or books 20. 'The cylinder is then can ied to and deposited on the cusping horse and the bait can be another so that the pulling op- "the next cylinder may proceed. ell known that the operation of so prod g machine-made glass cylinders is materially retarded when such cylinders are formed, as customary, with a contractedrupper end or neck, as to produce such neck a cylinder clears the top of the dog house.

comparatively small bait is I employed and air must be supplied under variable pressure in order to expand the cylinder to the requisite diameter, the operation of producing the neck usually taking three or four minutes, after which the pulling operation is much more rapid. With my bait no variable pressure of air is required because the cylinder is of uniform diameter from the bait to the bath from which it is drawn, and

being of large diameter and'in the form of a ring or annulus, no obstruction is ofi'ered which would tend to make the pressure of air greater withinthe cylinder than that exterior thereto. As a consequence the temperature is substantially uniform at both sides of the cylinder and the wall of the latter is not only straight but of uniform thickness.

parent that I hate produced a bait and operating mechanism therefor for use in glass.

ward and downward on the track way over said receptacle, a bar resting on the carriage, and a two-part bait, one part flexibly suspended from said bar, and the other part pi 'otally suspended from said carriage; said flexibly suspended part being adapted to be disengaged from the suspension means when the part is swung pirotally upward.

2. The combination of a molten glass receptacle, a track way, a carriage to move upward and downward on the track way over said receptacle, a bar resting on the carriage, and a two-part bait, the parts of said bait being arranged in concentric rela: tion and one within the other, arms projecting upwardly from one of said parts, flexible connections suspended from said bar and detachably hooked to said arms, rods secured to the other part of the bar and detachably hooked to said carriage so that when swung upward preliminary to detachment from the carriage, the said arms will become disengaged from the books of said flexible connections.

In testimony whereof, Iaiiix'my signature, in the presence of two witnesses.

" 1 WILLIAM VVESTBURY.

Witnesses: a l W. P. RoBrsoN,

H. L. GREENWALT.

From the above description it will be ap

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