US2239248A - Press assembly - Google Patents

Description

April 22, 1941.k o. o. RlEsER PRESS' ASSIEIIBLY Filed June 8. 1937 4 Sheets-Sheet 1 April 22, 1941. 6,6. Riesen 2,239,248

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Patented Apr. 22, 1941 l a very hot'condition are removed with the aid member positioned upon the table.

UNITED S'r'rgs rant 'l PRESS ASSEMBLY Gliver O. Rieser, Oak Park, Ill., assignor to The Richardson Company, Lockland, Ohio, a corporation of Ohio Application June s, 1937, serial No. 147,083

Y v 2 Claims. (Cl. 18-16) My invention has to do with the moulding and volve some danger to the operator. The fundastripping of articles made by a pressing operamental objects of my invention are to provide a tion and'I shall describe my invention in conmuch more simple and rapid operation, an operanection with means and a method for the manution having less danger and an operation in facture of small articles of the nature of cell 5 w'l'iieh atleast a partial unloading of the mould CSVGS ffl?? 550mg? battery gases, it being undermembers is performed by mechanical devices. nglufcrg; tfgerfgotlfl 11S aplllcble t'10 the The ancillary objects of my invention will be mamar variants f rtic es, an t at the parset'. forth hereinafter or will be apparent to one 0 C0115 Tuctlon Whlch are apskilledin the art upon reading these Aspeciicapropriate to the manufacture of stora e t r I cell covers do not constitute a limitaiorautorsi pons' I accomphsh th? =severa1 Oblects Ofrmy the broader aspects of my invention, as hereinmventlon by that Certam Constructlon and arf after aan tit fei ld iotlmess if mmh 1 e r e emp ary em-- @rstge man ufatu. of .storge battery ceu bodiment in two forms. Reference is now made press is provided having a broad flat v platen.V Such presses usually have a bed (which to G he drawings' Wherem.: f. Contains the'main hydraulic rain) uprights, and 'Figure 171s an elevatflonal View Wm? parts m a 'cross-'bar or bridge at the top, against which Sectlon of a' press oadmg and unloadmg means ythe pressure is exerted. Frequently such presses and mould'assmbiles for the manufacture of een have a'n intermediate platen, so that two moulds 20 covrs no? havmg.mserts' ina-y be used at once. There are return cylinders .Flg 2 1S a parma-.1 elevatlnal View o; a mess 'to push .downwardly the main platen after a WM? mgtld assemblies therein i'ulding operation and Where an intermediate Flg' 1S 9 plan new Showmg a platen' a table pl'aten is used there are cooperative parts to deand a' mould' member being removed fromjhe platen onto the table, parts of the press being ip ress the supplementary platen part-Way and n then hold it from further lowering While the shown in section, the view being taken along the lines 3--3 of Fig. 2.

main platen sinks to its lowermcst position, as is Fig. 4 is a partial sectional view through the co- Well understood in the art.

The moulds, which 'are broad and flat and of operative mould members in open condition.

` OU Fig. 5 is a perspective view oi a storage battery course comprise .appropriate male and female member-s fo-r the moulding of a large number of cell cover made with the devices of the foregoing nell covers at one time, are loaded on a table gures- :and the mould parts assembled together. Then Fig- 6 S a IJSISPGCVB VW 0f threaded mOllldthey are hauled upwardly by a winch or the like, n ing members for the vent plug 0f Storage battery 'and are slid into the press, coming to rest upon o5 Cell COVGTS- the main platen or the supplementary platen Fig. 'l is a sectional view through a cell cover and the pressing operation s'then carried out. 0f a typ@ having metallic iIlSeItS- Where, as is usual, the cell covers are being made Fig. 3 S a Perspective View 0f a metal insert of a rubber composition requiring vulcanization, 40 Fig. 9 is a sectional View through a portion of heat is applied tothe mould parts, for example, a press, mould members, and a loading and unby means of steam connections. loading table designed for the manufacture of After the close of the moulding cycle the presstorage battery cell covers of the type shown in sure'on the main cylinder is relieved and the Fig. 7.V The plane of this section is taken along platens are depressed by the supplementary line 9-9 of Fig. 13. cylinders, as aforesaid. The'mould assemblies in Fig. 10 is a similar View but showing the vmould of a winch from the table and the mould parts Fig. 11 is a fragmentary View with parts in vsecpried apart. Then the cell lcovers are removed tion showing the operation of the means for mov- 'from the lower mould part by hand, and new 50 ing the mould member from the platen to the charges of moulding material are placed in the table or vice versa. several mould cavities. Fig. 12 is a sectional view through a portion of It will be realized that this is a laborious, `a mould member designed for the moulding of time consuming and inconvenient operation articles with inserts. which also under certain circustances may in- ,55 Fig. 13 is a planl View of a table. anda mould of which the main platen 5 is attached. A supplementary platen is shown at 6. The top frameV member or bridge of the press is shown at 1. The push back cylinders and means for stopping the intermediate platen 6 at thedesiredpointare not shown. They are, however, well known in the art. The press in Fig. 1 is shown in open condition.

In my machine I bolt or otherwise fasten the upper mould members to the press andthey remain xedly in position excepting when it is desired to remove them for repairs. I have shown a male member 8 of the upper mould fastened to the bridge 1, and amale member 9 of the` lower mould fastened to the under side of `the intermediate platen 6. The respective female mould members are indicated at Il! and II. They rest respectively upon the main and intermediate platens and are slidably guided thereon by means I2 and I3. They are, however, removable by sliding in the guideways for loading and unloading, as will presently be described. The guideways on the main and intermediate platens not only serve to position the female mould members in a horizontal direction but also serve to hold the female members down onthe pla-tens during the separating operation. Stops I4 and I5 Vare provided to position the female mould members in the other horizontal direction. The male members of the moulds may be provided withpins IG which enter in corresponding'holes inthe lower mould members and assure accurate .relative positioning of the mould members during the pressing operation.

In the practice of my invention I provide tables indicated at I1 and I8 respectively inalignment with the supplementary andmain platens in theirl lowermlost positions. These tables are supported in any suitable way, the exact nature of thesupporting means not being a limitation upon my invention. The tables are so positioned thatl the female mould members may be slid from the platens onto the table tops for loading and unloading; and the table tops are-provided with guides I9 and 2I).to receive and vhold corresponding portions of the female mould members. They also may be provided with stops 2I and'22 to limit the range of movement of the mould tables.

At the conclusion oi a moulding operation the female mould portions I@ and I I may be slid lrespectively onto the tables I1 and I8 manually if desired, and by means of handles 23 and 24.

For an understanding of the nature of the particular article being made, reference may now be had to Figs. 4, 5 and 6. In the .'rst ofY these iigures, the female portion of theA mould is shown at II and the male portion at 9 inopen position. An exemplary-form ofystorage battery cell cover is indicated at `25.*in Fig. 5. It will be noted that this cell cover has a threadedvent opening indicated at 25. This is moulded by means of a threaded device-21, as shown most clearly in Fig. 6. This threaded moulding plug rests in a cavity in the female mould upon shoulders 28. The

rubber or other moulding composition being pressed in the mould cavity is moulded with threads against the member 21. The member 21 since it merely rests in a cavity in the female mould may be employed to strip the article therefrom in a way which I shall now describe.

It will be seen that the table top I8 (and the table top I1 is similar) is made up of interspaced strips Ia, having interspaces 29 therebetween. In these interspaces additional strips 30 are positioned. These strips are fastened to a framework 3| and they are so constructed as to be rigid in character. The strips 30 bear unloading pins 32 which are so positioned with reference to the construction of the mould member II that (as illustrated-in Fig. 4) an unloading pin 32 will lie under eachof the screw thread moulding members 21. The mould member II is perforated beneath each threaded moulding member as shownat 33.

Suitable means are provided for elevating the frame V3l after the mould has been slid onto the table and is properly positioned thereon. I Ahave shown one such means in Fig. 1 where lever arms 34 are pivoted to ears 33 on the main frame of the table. At one end these lever arms have a sliding pivotal connection with ears 35 on the frame 3|. The other ends of the lever arms are pivoted to line means 31 which in turn maybe pivoted to a treadle lever 38, pivoted to the table frame as at 39. A spring 4I! may be provided to hold the treadle -in upraised position.

When the treadle is in upraised position the frame 3I is in its lower-most position andI the top ofthe unloading pins 32 lie below the table top. When va female mould portion has been positioned on the table the treadle 33 Vmay be depressed, thus elevating the frame .3l and causing the several unloading pins 4to push-the moulded cell covers out of the female mould cavities by means of the threaded moulding plugs 21.

The moulded articles thus displaced from the mould .may quickly be removed by hand. When this is donea new set of the threaded moulding plugs 21 are placed in the various mould cavities and new charges of moulding material are placed in these cavities. Thereupon the female mould parts I0 and II are slid back into the press and ontothe platens respectively, and the cycle of operations is repeated. It will be understood that by these means theloading and unloading is not only made very much faster but is made very much less laborious and is also made safer. No Winches or the like need be used.

The moulded articles which are removed from the female cavity, of course, contain the threaded mould plugs 21. These maybe unscrewed by engaging a suitable wrench or thelike in the cavity 4 in each such plug. The stripping of the plug may be, and preferably is, carried on by operators other than the press tenders, so that the operation of pressing will not be held up thereby. For these reasons, it is preferable to provide several sets of the threaded moulding plugs for each mould assembly.

In Fig. '1 and following, I have illustrated a type of mechanism suitable -for the moulding of a slightly different type of article, namely an a1'- ticle with a metal insert. Such an article is shown in section at 4I in Fig. '7 with metal inserts indicated at 42. The type of metal insert does not require special description. It is, however, necessary to position the metal insert properly in the mould during the moulding operation and also to plug-up the center of it, to prevent its being filled with'the moulding composition. In Fig. 12 I have shown a female mould consisting of an upper part t3 and a lower part llt. The lower part bears pins 55, the purpose of which is to position the metal inserts. The necks l5 of the metal inserts rest in depressions, as shown, in the mould member t3. Moulds of this type are usually formed from members such as are shown at 47 in 14, which constitute groups of female mould members and members such as shown at 48 in Fig. 15 which underlie these members. By reference to Fig. 10, it will be understood that the parts t8 are fastened to a main mould frame 59, and that the parts M rest upon the parts 1&8, the pin members i5 serving to position them. The upper ends of the pins 55, as shown in Fig. 9, are received in holes 55 in the male mould member l.

In this type of mould it is a frame member 4S which is guided both upon the platen of the press and upon the table. The table guide is shown at 52.

Since these moulds are usually quite large and heavy, it is advantageous to provide mechanical means for sliding the female portion from the platen 53 of the press onto the table top 5d. For this purpose I provide a bracket 55 on the frame of the press, and I journal in this bracket a shaft 55 bearing a pinion 5l. I form a rack 58 on the frame 49 with which the teeth on the pinion 57 mesh. The shaft 56 is preferably mounted in a slidable bearing member 59, urged upwardly in the bracket 55 by means of a spring 65. The end of the shaft 56 may be, squared as at 5 l. If a Wrench or handle is engaged with the squared end of the shaft it Will be apparent that by rotating the shaft I can cause the mould assembly to move from the platen 53 onto the table 54.

It will be clear that the moulding of this type of device requires a somewhat diierent stripping operation. As a consequence, I provide a movable frame 52, which may be moved by means similar to that described for the frame 3|. The frame 62 bears a series of heavy pins 53 which pass through appropriate openings 63a in the mould member 48 and push upwardly the mould members 4l. This draws the positioning pins downwardly, stripping them from the metal fittings 42, thereby releasing the moulded articles in the moulding cavities. n During this stripping operation the mould portions comprising the main frame 59 and the members 43, are held down onto the table, of course, by the guide means 52. When the moulded articles have thus been released inthe mould cavities they may be picked up by hand.

It would also be Within the scope of my invention to combine the showing, say of Fig. l, and of Fig. 10, so as to provide a double stripping operation by providing both a reciprocable frame 62 with its attendant parts and a reciprocable frame 3| with its attendant parts in the same table. Under these circumstances it would be possible rst to release the moulded articles in the mould cavities by the means which have just been described, and then push the moulded articles out of the mould cavities by means of the threaded mould plugs 27, as has previously been described.

Modifications may be made in my invention Without departing from the spirit thereof.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In combination, a stripping table, a mould member thereon comprising a frame, a base member bearing locating pins on said frame and a cavity member vertically displaceable from said base member and having perforations to receive said locating pins, and means mounted on said stripping table for displacing said cavity member from said base member. Y

2. In combination, a stripping table, a mould member thereon comprising a frame, a base member bearing locating pins: on said frame `and a cavity member vertically displaceable from said base member and having perforations to receive said` locating pins, and means mounted on said stripping table for displacing said cavity member from said base member, said means comprising a reciprocable frame, means for reciprocating said frame, and displacement means mounted on said frame.

OLIVER O. RIESER.

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