US835236A

US835236A - Press for making insulators or similar articles.

Info

Publication number: US835236A
Application number: US27356305A
Authority: US
Inventors: Henry M Brookfield
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-08-10
Filing date: 1905-08-10
Publication date: 1906-11-06
Anticipated expiration: 1923-11-06

Description

M .x Z Z f. a D Z n H U i .w 1 4. T H L, A m M u. M M w i H E l M n u W m m 7 M A 7 N0- 835,236. PATENTED NOV. 6, 1906. H. M- BROOKPIBLD. PRESS FOR MAKING INSULATORS 0R SIMILAR ARTICLES.

APPLICATION FILED AUG.10,1905.

d ny BY s ATTQ/{VEYS I no: nrRRls ME-$20., wAswmcmn. nc PATENTED NOV. 6. 1906.

H. M. BROOKFIELD.

PRESS FOR MAKING INSULATORS 0R SIMILAR. ARTICLES.

APPLICATION FILED AUG. 10. 1905.

7 BHEET8-8HEET 2.

jig/2 WITNESSES 3y /n.'s A TTOHNE Y5 mmmqmm lAsulncmu. n, c

PATENTED NOV. 6, 1906.

APPLICATION FILED AUG.10.1905.

7 SHEETS-SHEET 3.

I 1 Au |-hM M.

Ill-ill .IIIIII u. A l 1 m 1H .r l I w q 1 i V .0. M \IIal 1:. Ilh w h,

//v VENTOR WITNESSES: WQMM 4 BY//s ATTORNEYS PATENTED NOV. 6, 1906. H. M. BROOKFIBLD.

PRESS FOR MAKING INSULATORS 0R SIMILAR ARTICLES.

urmouxon mum AUG.10.1906.

1 sums-anam- 4.

Zyj

Hlllll NIH HHIIIIII W/TNESSES: //VVENTO/? V BY 5 ATTORNEYS No. 835,236. PATENTBD NOV.'6, 1906. H. M. BROOKFIELD.

PRBSS FOR MAKING INSULATORS 0R SIMILAR ARTICLES.

APPLICATION FILED we.1o.19os.

7 sums-exam a.

"Ill 1 .1 imlnumunglgqll WITNESSES.-

ja A W 8) 71/5 ATTO7W$ W- PATEN'TBD NOV. 6, 1906.

H. M. BROOKFIELD.

PRESS FOR MAKING INSULATORS 0R SIMILAR ARTICLES.

APPLICATION FILED AUG. 10.1905.

7 SHEETS-SHEET 8.

INVEN OH BY fi s ATTORNEYS co wusumarau. n 1

No. 835,236. PATENTED NOV. 6, 1906. H. M. BROOKFIELD.

PRESS FOR MAKING INSULATORS OR SIMILAR ARTICLES.

' APPLICATION FILED AUG.10.1905. 1

7 sunmssnnw 7.

IIIIIIIIIIIIIIIIIIMIIlllllllllmljllllllllllllllllllllllllllIlllllllllll l I INVENTOI? W BY /1/.s ATTOfQ/fiadwl INK mm: ruins co., wAsumqram a. c

x711 TEESTATES PATENT om n.

HENRY M. 'BRoo1 F EL1 or-NEw YORK: N. Y.

PRESS FOR MAKING INs'uLAToFIs on SIMILAR ARTICLES.

Application filed August 10,;1905. Serial No. 273,568. I

rpiinsulators or similar artic es, and-it has es pecial reference to the moldsdusednnsuch presses and the appurtenances connected therewith. It is of especial value in connection with automatic presses, al-thoughasonle t5 features of my invention are capable of being" used with presses that arenot automatic.

: The objects of my invention are to improve and simplify the molds of such presses, to make them more accurate and certain in'..op.-

2o eration, to improve the insulators or other articles made on them, and to make them i more perfect and serviceable, to provide means for preventing clogging of the molds,

also to provide means for removing the insu- .25. lators or similar articles from .the molds, and

to convey them to the leer, and to do this without injury to such articles, also tonnake the operation of such presses and their appurtenances more rapid, and generally to g3o. improve the operation of such presses.

-' My invention consists in the novel devices and combinations herein shown de- :1 I scribed.

,- In the drawings accompanying this speci-' 5 fication and forming part hereof I have shown my improvement as connected with an automatic press for making insulators, although its use is not confined to the press shown and described, as it may be usedwitlrot'herautoo matic presses and in some of its features with presses that are not autoniatic. I

Referrin to the specific form of devices shown in t e drawings, which represent my improvement in its preferred form, Figure 1 45 is a side elevation of an automatic press embodying' my. improvement in its preferred form with some of the parts omitted for the purpose of clearness. -1 i 2 is a horizontal Section on the lines 2 2 of 1g. 1.. 3 is a 5o central vertical section through my improved mold, the follower and former andthe screwplunger being shown in moldmg position in I the mold. ..Fig. 4 is a s1de elevat1on of the inoldr Fig. .5. is a plan view; showingthe .55 r'nold open. Fig. 6 is a plan of the meansfor Specificatign pf Lettersl atent."

' "Patented Nome, 1906.

: removing the insulator from the mold, and

7 is a side elevation of the same. Fig.8 1s a plan of the turning-over cup for placing. the insulators on the endless'chain, and Fig. '9 is a side view of the same. 56

The press shown in the drawings is en--. tirely automatic. 1 is a stationary frame supporting the ,other i P g 9f. the Pr ss n m g sta on y: fta e I 6 3is 'a rotary turn-table upon which are @mounted the molds 4. As shown in Fig.- 2,- six.'molds are iprovided, although, ofco urse,- :the number 0 -molds may be varied tosuit] "the particular circumstances.

and former, which are here shown In one piece.-; In the form shown in the drawings the rotary. fable 3, with its molds and other parts car-* ried by it, are rotated.continuously,although,; 7 5

if desired, this. motion could. be madeintermittent.

The general mode of operating the press shown is as followszz-The glass is inserted at about the point 7. E. (See Fig. 2.) This may 8 o be done either by hand or automatically; but as this forms no part of the resent invention it is not shown. The glass is in-. serted during the rotation of the table. Im--.. mediately after the glass is poured into the 85 mold the screw-plunger. and follower are forced into he. lass. This movementiis accomplished au omatically by cams, as will be presently describedr. Very soonthere-- after the follower and former are movedup '0 out of contact. with the" molten glass inthe mold, the screw remaining in longer until the insulator isproperly set. This is also.accom-,x plished by acam. Then the screw,- lunger is screwed out-of the {glass in the m0 d-and-is further raised by a weight. The devices for accomplishing these two steps will be subse quently described. The next operation is to open the two upper movable parts of the mold. This operation is also performed by, 109 cams. The open position of the mold is indi-.;, cated at8. As soon as the mold begins .to open a fork is automatically moved inward, grasping theinsulatorin one of the circular.- grooves near the top portion of the insulator, I05 and as soon as the mold is fully opened-the fork is raised, lifting the insulator upward from the mold, and the fork is thenswung outward and the insulator diSeEngagedIIrOm 79 r -51s the screw-plunger, and fi'thefollowei it. The insulator falls into 'a cup prepared;

for it, and this cup turns it over, so that the petticoats will be downward, placing it upon an endless chain running into the leer.

The various devices of the press shown in the drawin s will now be described in the order in which the above operations take place. M improved mold is particularly shown in igs. 3, 4, and 5. It consists of a solid lower art 9, having a hollow cupsha ed interior 10, adapted to form the head of t he insulator, as shown in Fig. 3, and of two movable upper portions 11 11, pivoted together on a pm 12. The means forwolpening and closing the parts of the mold 1 be presently described. In order to aid in centering the .lower solid part of the mold 9, I preferably provide adjusting means, preferably adjustm '-screws 13. As shown, there are three of t ese. These adjusting-screws pass throu h a base-plate 14, secured to the rotary tab e 3.- I also preferably provide means for cooling the lower solid part of the mold, as well as the upper movable parts. The means shown for cooling the lower part consist of an inlet-p'pe 15, connected with any suitable source 0 sup 1 of the cooling medium,-(not shown,) which delivers the cooling medium to a chamber 16 in the lower part of the mold. In order to provide a circulation, the cooling medium is removed from the mold by an outlet-pipe 17, which discharges the cooling medium in any suitable wa (Notshown.) The inlet-pipes 18 simimi; supply a cooling medium for the inte ..r1or chambers 19 of the movable parts of the mold. The outlet-orifices are indicated at 20. In the form shown the parts 21 21 of the base 14 are made to extend outward sufficiently, so that its upper surface will furnish a support to the outer ends of the movable upper parts of the mold when they are swung open into their opened position, thus relieving the strain on the pivot-pin 12. The upper outer part of the lower fpart of the mo (1 and. the lower inner part 0 each of the upper movable parts of the mold have doveta' surfaces in the ordinary way in order to insure-a tight and accurate fit. Heretofore the lower part of the mold at the bottom of this dovetail has always been extended outward in a horizontal surface, such horizontal surface formin the support for the upper part of the mold when it swings outward. In such a construction the powdered glass, dust, and other material are apt to gather on this supporting horizontal surface and be forced inward into the dovetail as the movable parts move inward. This prevents the accurate registering of these parts and prevents the closing of the mold tightly. Hence the molten glass is apt to leak near the open joint and form seams on the insulator, often making them wholly unmarketable. In order to overcome this trouble, I have removed the supporting-surface from proximity to the dovetail, preferably by separating the mold from the su porting-frame 14 by means of a circular hol ow space 22. Whatever refuse matter gathers on the upper part of supporting-surface 21 will fall into the pocket formed by this space, where it will give no trouble and can be cleaned out from time to time. By this im roved construction I am enabled always'to c ose the molds tightly.

Pivot-pin 12 is made in the form, referably, of a slightly-inverted truncate cone, slightly smaller in diameter toward the bottom than at the top. Heretofore as such pivot-pins have been used they have been apt to work upward, making the joint connection between the two parts of the mold a loose one and unfitting the parts for perfect work. In order to overcome this, I preferably employ a locking-bar 23, bolted to support 24, projecting upward from base 14. The locking-bar 23 prevents upward motion of the pivot-pin 12 and also prevents its turning. Such turning tends to wear the pin and also to lift it. These troubles are overcome by my improvement. If desired, support 24 can be made adjustable vertically by means of slots 25 and support 24 and screws 26. As ivot-pin 12 wears its vertical position can e adjusted to compensate for it.

The screw-plunger and the'follower and former can be raised and lowered by any suitable means. These form no part of my invention and are not shown in full detail. They are shown merely in general outline and will be only briefly described in connection with the outline features shown. Both the screw-plunger 5 and the follower and former 6 are moved downward by frame 27, moving in guides in vertical supports 28. Frame 27 is forced downward by a cam-track 29, which is dipped downward in the usual way at the point where the plum er and follower are to be moved downwar at 30 into the mold. Roller 31, secured to the frame, rides on top of cam-track 29. 32 32 are two studs fast to the frame, passing through holes on the upper part of the follower and former. Springs 33 encircle studs 32 and normally tend to press the follower and former downward. They are merely for the purpose of permitting the follower and former to yield in the usual way. When frame 27 moves downward, it forces the follower and former downward through springs 32 and also forces screw-plunger 5 downward by means of the frame striking a shoulder (not shown) on the shaft of the screw-plunger 5.

Shortly after the screw lunger and the follower have been presse downward the follower and former are lifted upward by the raising of frame 27, throu h roller 31 and cam-track 29,to theirnorma positions. The screw is of course ermitted to remain in the glass the proper ength of time to set the screw-thread. It is then raised by means of Masai.

a two-part nut 34, each part of which is mounted on a spring-arm 35. These nuts are normally separated, but are brought together when it is desired to screw screwplunger 5. As the devices for bringing the nuts to ether and separating them are old and welTknown and form no. part of the present invention, they are not shown and will not be described. As soon as the nut has closed upon the screw-threaded portion of screw-plunger 5 the screw-plunger is rotated by means of a beveled gear 36 on the shaft of screw-plunger 5 and beveled gear 37, which is connected with any suitable mechanism for' rotating it at the proper time. As such mechanism is old and well known and forms no part of the present invention, it is not shown and will not be described. At all times, except when the screw-plunger is to be raised, this mechanism is not operated. Af-,

ter the screw-plunger has left the glass it sto s rotating, and 1t is pulled up to its norma position by means of a weight (not shown) secured to ropes 38 38, passing over pulleys 39 39 and secured to cross-bar 40, r0- tatably connected by collars 41 41 to the shaft of screw-plunger 5.

It will of course be understood that suitable means are provided for rotating the table 3. y means may be employed, those shown consisting of a main driving-shaft 42, driven from any suitable source of power, having a worm 43 meshing with a wormwheel 44, secured to the same sleeve 45 that carries the rotary table 3. It will of course be understood that cam 29 and certain other cams are stationary, the parts operated. by them coming into contact with them during the rotation of the rotary turn-table and the arts mounted upon it. 46 is a chain-wheel driven by chain 47 from chain-wheel 48 on shaft 42 and through shaft 49 and gears 50 51, the latter driving shaft 52. This drives the mechanism, which rotates at the proper time the various gears 37, the latter rotating the screw-plunger 5. The clutch mechanism and the other parts intervening between shaft 52 and gear 37 form no part of the present invention and are not shown.

The next 0 eration is the opening of the mold. The d dvices shown for this urpose are illustrated in Figs. 1 and 2 MIL are as follows: Connected to the outer end of each movable upper half-mold is an arm 53. For pur oses of adjustment this arm 53 is made in t e usual way, with two screw-threaded portions and a nut 54. To the other end of arm 53 is connected an arm 55, fast on upright rod 56, having another arm 57 adapted to engage a curved cam-surface 58, secured to frame 27. It will be understood, of course, that each half-mold is similarly connected to one side of one of the frames 27. The cams 38 are made operative by the lifting of frame 27 at the proper time. This lifting is caused if required to do so.

by roller 31 riding up on the raised portion 59 of cam-track 29. This operation is performed shortly before the point marked 8 in Fig. 2 is reached by a mold The next operation is the raising of the insulator out of the lower solid part of the mold. I prefer to do this by lifting it from above. The preferred devices shown for this ur ose consist of a swinging arm 60, provide with a fork 61. This arm swings inward as the mold begins to open, so that the fork encircles the msulator in the groove near the upper part of the insulator. The arm is then raised vertically, lifting with it the insulator, and it is then swung outward in its raised position. As it passes outward the lower part of the insulator or the head strikes the curved surface at the end of a stationary arm 62, which forces the insulator out from the fork. The insulator then drops into a cup 63. The devices for moving the swinging arm 60 are especially shown in Figs. 1, 2, 6, 7, 8, and 9.

Arm 60 is swung inward by means of a cam-shaped arm 64, fastened to a sleeve 65, that carries the swinging arm 60. Sleeve turns on a stationary stud 66, fastened to upright standard 28 on the rotary table. A spring 67 normally holds sleeve 65, so that arm 60 is in its outward position. As the rotary table rotates cam 64 comes into contact with roller 68, secured to the stationary table 2 of the machine, being supported by a bracket 69. There is only one roller 68, and with this the different cams 64 come into contact at the proper time. The action of roller 68 on cam 64 causes sleeve 65 to rotate, swingin arm 60 inward until fork 61 embraces t e insulator.

Sleeve 65 and arm 60 are raised upward by 'means of a sleeve 70, loose on stud 66, u on ed at which sleeve 65 rests. Sleeve 70 is rais the proper time by means of two links 71, pivoted one at each side of the sleeve, the inks being pivotall connected with two links 72, pivoted to t e framework of the rotary table. Links 71 and 72 at their junction carry a roller 73. 74 is a cam upon which roller 73 rides when the proper point is reached. There is one cam 74, and it is carried by bracket 69. When a roller 73 strikes it, the roller rides up on it and lifts links 71, sleeve 70,- sleeve 65, and swinging arm 60. This raises the insulator high enough so that the arm 60 in swinging outward will cause the insulator to clear the mold. A spring 75, connected with roller 68, permits that roller to give in case arm 60 is blocked and cannot move inward, and spring 76 ermits cam 74 to give in a similar way shou d roller 73 or its connecting parts be blocked and unable to move. In both of these cases in the instances cited some part of the machine would be broken unless the roller 68 and cam 74 were permitted to yield, Swinging arm 60 is a there will be no departure moved outward, carrying the insulator by means of spring 67 whenever cam-arm 64 and roller 68 permit the movement. In practice the motion will not be a sudden one, as otherwise the insulator might be thrown out of the fork. Toward the close of this down somewhat through its own weight,

tending to'make the cross-section of the interior screw-thread depart from the true circular form. This is a serious objection in practice, as many insulators will have their screw-threads so distorted that they cannot be screwed upon the wooden screw-pins intended to support them. By turning the insulator over, so that it will stand upon the endless chain upon the petticoat portion, the insulator will stand with the axis of the interior screw in a vertical fposition,.so that cm the true circular cross-sectional form. Any settling of the glass will be substantially at right angles to the line of the screw-thread, and in practice this leads to no objectionable result. The devices shown for upsetting cup 63 are as follows: They are particularly shown in Figs. 1, 2, 8, and 9. In Fig. 2 the cup is shown in its vertical position or the osition in which the insulator is dropped into it, and Fig. 8 shows the cup has turned a quarter-revolution and in the act of spilling out the insulator upon the endless chain. It is found in practice that a quarter-turn is suflicient for the purpose. Cup 63 also has referably a swin ing horizontal movement 1n order to carry t e msulator from the position in which it receives the insulator to a osition directly over the endless chain. Foth of these movements take place together. The swingin or sidewise movement is caused by means 0 a rod 78, pivoted to a rod 79, which supports on 63. Rod 79 is supported toward one en in bearings 80, carried by a stationary bracket-81, projecting from the stationary table 2. It is connected with bearing 80 by means of a swivel joint. At its inner end it is supported by a toothed segment 82, secured to rod 79 and gearing with a stationary rack 83 on bracket 81. Rod 78 asses through a sleeve 84, pivoted or swiveihd to a bell-crank lever 85, pivoted at 86 in the stationary table 2 and carrying at its inner end a roller 87, adapted to engage with cams 88, one for each mold,

The leer is not shown in'the drawin s,

mounted on the rotary table 3. When roller 87 engages cam 88, it forces rod 79 and cup 63 to swing outward. The motion of the bell-crank to the rod 78 is communicated through a spring 89, encircling the rod between the end of the bell-crank and a shoulder 90 on the rod.

Rod 79 and cup 63 are brought back to their normal inward position by means of a chain 91, running over a pulley 92, and a chain having at its lower end a weight 93. 79 is slidingly pivoted to bearing 80, passing through a sleeve formin part of that bearing. A spring 94, encirc ing rod 79 between the bearing and a shoulder on the rod, holds rod 79 in its normal position, but permits it. to give longitudinally should there be any blocking. This giving is to revent a breaking of any of the parts shoufd a block occur. is a hand-wheel mounted on rod 79 to permit a manual upsetting of cup 63 should that be desired. The turning movement of cup 63 is imparted to it by toothed segment 82, running over and engaging with rack 83. I find in practice that a quarter-revolution of, the cup is sufficient for the purpose. This throws the insulator out of the cup upon the chain, bringing it, with the petticoats, downward, so that the insulator will stand upon the chain with its head upward and its petticoats down. The endless chain bears it to and through the leer.

It is not essential that the means for raising the insulator or other article from the mold operate from above and lift the insulator. Bya suitable modification the device would operate from below through an opening in the mold to force the insulator up, provision of course being made to close the mold tightly for the next operation; nor is it essential that the raising means swing in and out, although I )refer to so arrange them; nor isit essential t lat the means for forcing the insulator out from the fork be stationary or that one be provided for each mold, as in the form shown in the drawings, as a single arm could be provided for the entire press mounted upon the stationary support at a suitable oint; nor is it essential that the upsetting evice be in the form of a cup, as any suitable device for that )urpose may be em ployed and any suitable means may be provided for the upsetting operation; nor is it essential that my improved device for protecting the dovetail joint between the lower and upper parts of the mold be provided with an opening, as shown in the drawings. It is sufiicient if the supporting-surface for the upper parts of the mold upon which the powdered glass and other refuse is liable to fall be not adjacent to the dovetail jointas, for

examp e, the supporting-surface might be jai swinging outward'to its-ontmst limit would always be upon such support.

' In' general my invention is not limited to the specific form of apparatus shown in the drawin s but those may be changed or varied w1dely without departing from my broad invention.

What I claim as new, and desire to secure by Letters Patent, is- 1. In a press, the combination of a mold I for forming glass insulators or other similar glass articles having a single solid ortion adapted to form the head 0 the insu ator or other article, and a device for lifting the in- 5 sulator'or other article from the solid lower part of the mold, and swinging it to one side of the press to remove it from the ress, and means for removing it from said ifting device into an upsetting vessel, and means for turning said vessel to u set the article upon a receiving-surface so t at the petticoat or wider ortion of the insulator or other article wil be downward.

2. In a press, the combination of a mold 2 5 for forming glass insulators or other similar glass articles having a single solid ortion adapted to form the head of the insu ator or other article, and a device for lifting the insulator or other article from the solid lower 0 part of the mold, and swinging it to one side of the press to remove it from the ress, and means for removing it from said ifting-device into an upsetting vessel, and means for turning said vessel to upset the article upon 3 5 a (fonveyer adapted to receive and carry it to a eer.

3. In an automatic ress, the combination 1 of a mold for forming g ass insulators or other similar glass articles having a single solid portion ada ted to form the head of the insulator or ot er article, and a device for liftin the insulator or other article from the soli lower art of the mold, and swinging it to one si e of the press to remove it from the press, and means for removing it from said iftingdevice into an upsetting vessel, and means for turning said vessel to upset the article upon a conveyer adapted to receive and carry it to a leer, whereby the insulators or other glass articles will be automatically removedfrom the lower solid part of the mold, anc delivered to and placed upon a conveyer with the petticoat or wider portion downward ready for passage through the leer in that position.

4. The combination of a mold for forming glass insulators or other similar glass articles, a lifting-arm adapted automatically to swing inward and grasp the insulator or other arti- 6o cle as the mold opens, and lift it out of the mold and wing it outward free of the press, and a device for forcing the article from the grasp of the lifting-arm into a receiving vessel adapted to place it upon a conveyer adapt- 6 5 ed to carry it to the leer.

5. The combination ofa mold for forming glass insulators orlother similarglass articles,

alifting-arm adapted automatically to swing inward and grasp the insulator or other arti-- cle as the mold opens, and lift it out of the 7o mold and swing it outward free of the press, and a device for forcing the article from the grasp of the lifting-arm into an upsetting vessel ada ted to receive it, and to upset it with its petticoat or wider portion downward upon 7 5 a conveyer, adapted to carry it to the leer.

6. In a ress for forming glass insulators or other simi ar glass articles, an u setting vessel for receivin the molded insu ator or other article adapte to upset the said article upon 1: a receiving-surface, so that its petticoat or wider ortion will be downward.

7. n a press for forming glass insulators or other similar glass articles, an u setting vessel for receivin the molded insu ator or other article adapte to turn the said article upon a receiving-surface, so that its petticoat or wider ortion will be downward.

8. nxalgress for forming glass insulators or other si ar glass articles, an n setting ves- 9osel for receivin the molded ins ator or other article adapte to upset the said article upon a conveyer adapted to carry it to the leer, so that its petticoat or wider portion will be downward. 5

9. In a ress for forming glass insulators or other si ar glass articles, an u setting vessel for receivin the molded insu ator or other article, means or turning said upsetting vessel to upset the said article upon a conveyer 10o adapte to carry it to the leer, so that its petticoat or wider portion will be downward upon the conveyer, and a conveyer adapted to carry such article to the leer.

10. In an automatic press for forming 1o 5 glass insulators or other similar glass articles, the combination of a turn-table, a plurality of molds mounted and carried thereon, means for opening the molds, a liftin -arm adapted automatically to swing inwar and no grasp the insulator or other article as the mol opens, and lift it out of the mold and swing it outward free of the press, and a series of devices, one for each mold, mounted upon the turn-table, and each adapted to I r 5 force the article from the grasp of the liftingarm.

11. In an automatic press for forming glass insulators or,other similar glass articles, the combination of a turn-table, a plurality of molds mounted and carried thereon, means for opening the molds, a series of lifting-arms, one for each mold, mounted upon the turn-table, and each adapted automatically to swing inward and grasp the insulator r2 5 or other article as the mold opens, and lift it out of the mold and swing it outward free of the press.

12. In an automatic press for forming glass insulators or other similar glass articles, I 0

the combina ion of .a turn;table, a plurality upper parts 'ano a lower part supporting each ofin'dlds "mounted and carried thereon, upper part, the combination of dovetailing 3 5 means for opening the molds, a series of liftparts, one on each upper part of the mold, ing-arms, one for each mold, mounted upon and corresponding ones on the lower for per- 5 the tum-table, and each adapted automaticmitti tight and accurate closin and regally to swing inward and grasp the insulator istry dgthe movable upper parts the mold,

or other artlcle as the mold opens, and lift it and sup orting-surfaces on the lower part of .40 out of the mold and swing it outward free of the mo d for supporting the upper parts, the ress, and'a series of devices, one for each placed otherwise than in' the dovetail joint, :0 mols, mounted upon the tum-table, each ,whereby clogging of the dovetail joint will be adapted to force the article from the grasp of prevented. its corresponding lifting-arm. 17. In a mold for forming insulators or 5 13. The combination of movable parts ofa similar glass articles, composed of movable mold adapted to open or close on each other, {upper parts and a lower part supporting each arloose vertical pivot-pin upon which said upper part, the combination of dovetailing movable parts pivot, and a locking-pin parts, one on each upper part of the mold, adapted to engage with the pivot-pin to preand corresponding ones on the'lower for pervent the latter from working upward. mitting tight and accurate olosin and re 14. The combination of movable parts of a Iistry o the movable upper parts 0? the mole, 2o mold adapted to open or close on each other, and supporting-surfaces on the lower part of a loose taperin vertical pivot-pin upon the mol for supporting the upper parts, prowhich said mova 1e parts pivot, and a lock- .vided with a cut-away portion at each doveing-pin adapted to engage with the pivot-pin 'gtail joint, whereby any powdered glass or 'toprevent the latter from working upward. jother refuse material will fall through. the 25 15. The combination of movable parts of a opening made by the cut-away portion, and

mold adapted to open or close on each other, will not clog the dovetail joint. a loose taperin vertical ivot-pin upon In testimony whereof I have signed m which said mova 1e E's-{Jigs pivot, and a verjname to this specification in the presence of ticallyadju'stable loc -p1n adapted to en two subscribing Witnesses. 3o gage with the pivotpin to prevent the latter HENRY M. BROOKFIELD.

from working u ward. Witnesses:

1-6. In a mo d-for forming insulators or I FRANK N. Ronnnron, similar glass articles, composed of movable DE FOREST JETMORE.