US628157A

US628157A - Glass-pressing apparatus.

Info

Publication number: US628157A
Application number: US69347498A
Authority: US
Inventors: George E Cleveland
Original assignee: MATILDA OVER
Current assignee: MATILDA OVER
Priority date: 1898-10-14
Filing date: 1898-10-14
Publication date: 1899-07-04
Anticipated expiration: 1916-07-04

Description

No. 628,157.' Patented luly 4, |899.

v G. E. CLEVELAND. GLASS Pnssslns APPARATUS.

(Applxcation Bled Oct 14 1898 2 Sheets-Sheet l,

(No Model.)

mekumag? ma mvEN'roR,

Nu. 628,l57. Patented July'4, 1899.

G. E.,CLEV.ELAND.

GLASS PBESSIIG APPARATUS.

(Application, med oct. 14, 1898s,'

l2 Sheets-Sheet 2.

(No hiodel.)

INVENTOR,

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UNITED STATES PATENT 4Orricn.

GEORGE E. CLEVELAND, OF FREEDOM, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGNMENTS, OF ONE-HALF TO MATILDA OVER, OF MUNCIE,

INDIANA.

GLASS-PRESSING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 628,157, dated July 4, 1899.

Application filed October 14, 1893,

To all whom, it may concern:

Beit known that I, GEORGE E. CLEVELAND, a citizen of the United States, residing at Freedom, in the county of Beaver and State of Pennsylvania, vhave invented or discovered certain new and useful Improvements in Glass-Pressin g Apparatus, of which improvements the following is a specification.

The invention described herein relates to certain improvements in glass-presses, said improvements being applicable to the ordinary single-plunger presses and also to multiple-plunger presses in which a series of plun` gers are so mounted as to be capable of being shifted in succession to position for actuation by the4 operating mechanism.

The invention has for its object a construction of plunger-actuating mechanism whereby the plunger may be positively actuated for effectingv the initial shaping operation, but will be actuated and held during the final shaping and setting of .the glass through the medium of a spring or other vyielding mechanism.

The invention is hereinafter more fully described and claimed. r

In the accompanying drawings, forming a part of this specification, Figure 1 is a side elevation of my improved plunger-.operating mechanism. Fig. 2 is a View, partly in front elevation and partly in section, showing the plunger and its actuating mechanism when the former is raised. Fig. 3 is a similar view showing the position of the parts at the end of the positive movement of the plunger. Fig.

t 3a is a detail view of a portion of the actuating mechanism in' the position shown in Fig.' 3. Figs. 4 and 5 are views similar to Figs. 1 and 2, illustrating a modification in the plunger-actuating'mechanism. In Fig. 5 is shown also means for preventing breakage of the apv paratus when too great a quantity of molten metal has been placed in the mold.

For convenience of illustration and description my improvements are shown and described as applied to asingle press; but its adaptationto other forms of presses will be obvious to those skilled in the art.

As shown in Figs. 1, 2, and 3, the power- 5o shaft l' is mounted in suitable bearings se- Serial No. 693,474. (No model.)

cured to the frame of the press. Arms or disks 2, preferably provided with radial slots, are secured on the projecting ends of the shaft, and pins 3 are adjustably secured in said slots. These pins are connected by rods 4 to the ends of the cross-head of, which is guided in its vertical movements by the posts or standards G, secured to the bed of the press. Arms 7 have their inner ends secured on thev pins 3 outside ofthe rods 4, and pins S are attached to the outer ends of these arms preferably in such manner as to permit of the adjustment of the pins 8 along the slots 9 in the arc of a circle toward and from the pins 3, as clearly shown in Figs. 1 and 3M The pins Bare connected by rods 10 to the ends of the cross-head 11, movably mounted on the posts or standards 6 above the cross-head 5. The crossheads 5 and l1 are provided at points approximately midway between the posts or standards Withwertical openings, through which the plunger-actuating rod 12 passes loosely. In order that the plunger-actuating rod may lbe forced down by the cross-heads,

collars

13 and 14 are secured to the rod below the crossheads. The collar 13 is so located on the rod 12 that the cross-head 5 will bear directly thereon during itsdownward movement, so as to positively shift the plunger; but a spring 15 is interposed between the collar 1.4 and the cross-head 11, so that the plunger-rod will be yieldingl y actuated by said cross-head. The rod 12 is raised by the cross-head 11 through the medium of a spring 16, interposed between saidcross-head and a collar 17 on the rod, or by other suitable means.

Vhile it is preferred to so adjust the arms 7 on the pins 3 that the .pins 8 will move along arcs of circles of greater radius than the circle described by the pins 3, the pins 3 and 8 may be adj usted an equal distance from the axis of the shaft; but in the latter case the collar 14 should be adj usted on the rod 12,

so as to hold the spring 15 yconstantly under vshaft 1 inthe direction of the arrow a the IOO cross-heads are drawn down. It will be observed, however, that as the arms 7 project backwardly as regards their direct rotation from the pins 3 the cross-head 5 will begin its downward movement in advance of the cross-head ll,although the pins 3 and 8 may move in circles of the same radius and having a common center. The actuating mechanism is so constructed that the plunger will not be given its full movement b y the crosshead 5, but will be given sufiicient movement to approximately finish the article. This is clearly shown in Fig. 3, which shows the plunger in the lowest position to which it is positively moved by the cross-head 5.

By reference to Figs. 3 and 3, it will be seen that when the pins 3 and the cross-head 5 have reached the lower limit'of their movements the pins 8 and cross-head ll will be above the lower limits of their movements. By the continued rotation of the shaft l the pins 8 and cross-head ll will be moved down, so com pressing the spring l5 that it will exert sufficient pressure of the plunger to force it down under a yielding pressure to complete the shaping of the article. This spring-pressure will be exerted on the plunger for some time after the pins 8 have passed'the power limits of their movements, so that the plunger will be held down a sufficient time to permit the glass to set.

As it is practically impossible to charge the necessary amount of glass in a mold, it has heretofore been deemed impracticable to employ a positively-actuated plunger, as if atoo large amount of glass were placed in the mold and the plunger moved ,its full stroke positively a portion of the glass would be squeezed out of the mold or the actuating mechanism or mold would be broken.

It is characteristic of the operation of my invention that the most dificult part of the operation of molding glass-z'. e., starting the glass to Iiow or spread out along the walls of the mold-is efected by positive pressure, while the comparatively easy portion of the operationi. e., continuing the iiow of glass to final shape and holding it in such a position until the glass becomes set-is eected by yielding pressure. This initial positive pressure and successive spring-pressure can be effected by many different forms of mechanism, and hence the invention as set forth in the terms of the claims are in no wise limited to any specific construction of mechanism for operating the plunger.

In Figs. 4 and 5 l have shown another form of mechanism adapted to effect the operation of the plunger. This mechanism consists of disks 20, loosely mounted on studs 2l, secured to the posts 6 and provided on opposite sides with eccentric grooves for the reception ofantifriction-rollers22. These antifrictionrollers are secured to one end of the connectin g-rods 4 and l0, which have their opposite ends connected to the ends of the cross-heads 5 and l1. The grooves in the faces of the disks are so formed as to effect the movements ofthe cross-heads and plunger-actuating rod, as hereinbefore described. The disks are rotated by pinions 23 on the driving-shaft 24, engaging teeth on the peripheries of the disks.

In Fig. 5 I have shown further a device for obviating possible damage to my machine when carelessly operated. WVhile it will be found that the method of operating the plunger by iirst a positive and then a yielding force, as above described, is amply sufficient to guard against breakage of the actuating mechanism or mold -under ordinary usage, it will sometimes happen through the employment of unskilled or careless workmen that a quantity of molten metal considerably in excess of that required to produce the finished article will be placed in the mold. In such a case the molten metal may fill the entire space between the mold and plunger before the plunger has reached the limit of its positive stroke, there being no further space into which the molten metal can flow. Any further positive movement of the plunger into the mold will tend to break the mold or other parts of the machine. To guard against such accidents, I interpose, as illustrated in Fig. 5 of the drawings, a spring 25 between the-cross-arm 5 and collar 13 of sufflcient stiffness to withstand compression under ordinary operations; but under the conditions detailed above it will allow of sulficient compression to prevent further movement of the plunger into the mold'while continuing to exert a yielding pressure upon the molten metal Within the mold during the balance of the operation, and thereby avoid breakage of any part of the machine.

I claim herein as my invention l. In a glass-pressing apparatus, the combination of a plunger, plunger-actuating mechanism and connections between the actuating mechanism andthe plunger, for driving the plunger positively during a portion of its stroke and applying a yielding force to the plunger to effect its final movement, substantially as set forth.

2. In a glass-pressing apparatus, the combination of a plunger, means for positively driving the plunger for a portion of its stroke and means for applying a yielding force to the plunger for effecting the final movement thereof, substantially as set forth.

3. In a glass-pressing apparatus, the combination ofa plunger,a plunger-actuating rod, two crossheads adapted to effect the operative movement of said rod, one of said crossheads operating positively on the rod to el'ect its preliminary movement, a yielding connection between the rod and the other cross-head and means for shifting the cross-heads, substantially as set forth.'

4. In a glass-pressing apparatus, the-combination of two cross-heads, means for shifting the cross-heads, a plunger, a plunger-actuating rod passing loosely through the cross- IIO heads, two shoulders or collars on said rod, one of which is so arranged that one of the cross-heads will have a positive bearing thereon, and a spring arranged between the other collar or shoulder and crosshead, substantially as set forth. n p

5. In a glass-pressing apparatus, the combination of a plunger,a plunger-actuating rod,

v two cross-heads, connections between the rod and cross-heads, whereby one of the latter will apply a positive force to the rodl and the other cross-head will apply a yielding force to the rod, and means for causing the crossheads to operate successively, substantially as set forth. l

6. In a glass-pressing apparatus, the combination of a plunger, plunger actuating mechanism, connections between the actuating mechanism and the plunger for imparting to the plunger a positive unyielding initial movement and a secondary yielding movement, and means for permitting of the arrest of the plunger during this initial movement, upon meeting a substantially unyielding resistance, and the continuance of a yielding pressure upon the glass within the mold during the remainder of the operation, substantially as set forth. p

7. In a glass-pressing apparatus, the combination of a p1unger,a plunger-actuating rod, two cross-heads adapted to successively effect the operative movement of said rod, a con-- nection between one of said cross-heads and the rod which is under normal operative conditions unyielding but which is adapted to yield in case the plunger meets with a substantially unyielding resistance to its movement, whereby a positive initial movement is imparted to the plunger under normal operative conditions, but whereby the plunger may be stopped in its initial movement upon meeting a substantially un yielding resistance to its initial movement; a connection between the other of said cross-heads and the rod which is normally yielding, whereby a final yielding force is applied to the plunger; and means for causing the cross-heads to operate snccessively, substantially as set forth.

8. In a glass-pressing apparatus, the com'- bination of two cross-heads, means for shifting the cross-heads, a plunger, a plunger-actuating rod'passing freely through the crossheads, two shoulders or collars on said rod, and springs arranged between the said crossheads and said shoulders or collars, substantially as set forth.

In testimony whereof I have hereunto set my hand.

GEORGE E. CLEVELAND.

IVitnesses DARWIN S. WoLco'rT, M. S. MURPHY.