SE190895C1

SE190895C1 -

Info

Publication number: SE190895C1
Authority: SE
Publication date: 1964-01-01

Description

Uppfinnare: J Bobst Prioritet begdrd frdn den 14 november 1961 (Schweiz) Foreliggande uppfinning avser en sakerhetsanordning mot ofrivilliga 5verbelastningar i en digelpress med en rorlig, medelst en snaeka driven digel. Inventor: J Bobst Priority requested from 14 November 1961 (Switzerland). The present invention relates to a safety device against involuntary overloads in a crucible press with a movable crucible, by means of a snail driven.

Fig. 1 p& bifogade ritning visar i halvt schematisk vertikalsektion en digelpress av (let slag som foremalet for foreliggande uppfinning avser. Fig. 1 of the accompanying drawing shows in a semi-schematic vertical section a crucible press of the type to which the object of the present invention relates.

En sadan press omfattar tva diglar 1 och 2, av vilka den nedre digeln 2 är rorlig. Denna digel hojes och sankes suceessivt, varvid den paverkas med knahavtyg 3, vilka drivas me-deist frail en central axel 5 utgaende lankar 4. Such a press comprises two crucibles 1 and 2, of which the lower crucible 2 is movable. This crucible is raised and lowered successively, whereupon it is actuated by knuckle cloth 3, which are driven by means of a central shaft 5 outgoing links 4.

Del amne som skall bearbetas, t. ex. kartongark, inmatas mellan diglarna medelst transportkedj or 6, som medbringa med transversala gripare forsedda gripstanger 7. Part of the subject to be processed, e.g. cardboard sheets, are fed between the crucibles by means of transport chains 6, which carry gripping rods 7 provided with transverse grippers.

Del ãr tydligt, att trycket mellan diglarna ej bOr astadkommas forran i det ogonblick ett for bearbetning avsett ark befinner sig mellan diglarna, varvid varje annan, frammande kropp iir utesluten, i synnerhet en gripstang. Dad& finnes en tvangsstyrd forbindelse mellan axeln 5 och transportkedj ornas 7 drivorgan. It is clear that the pressure between the crucibles should not be exerted until the moment a sheet intended for processing is between the crucibles, excluding any other foreign body, in particular a gripping rod. There is a forced connection between the shaft 5 and the drive means of the transport chains 7.

Da sadana presser medgiva mycket stora tryckkrafter, pa t. ex. flera hundra ton, kan en Iran en frammande kropp, ett trasigt ark eller frail en gripstang i felaktigt lage harrorande 8verbelastning bit farlig fOr maskinen i dess helhet. Since such presses allow very large compressive forces, e.g. several hundred tons, an Iran can a foreign body, a broken sheet or frail a grab bar in incorrectly make harrowing 8verload load dangerous for the machine as a whole.

Av denna orsak ha vissa regleringsorgan anordnats, vilka ha till uppgift all stanna pressen, sä snart nagot onormalt intraffar. Av det faljande framgar, att delta emellertid kan vara otillrackligt. For this reason, certain regulatory bodies have been arranged, which have the task of stopping the press as soon as something abnormal occurs. From the following it appears, however, that participation may be insufficient.

En press av den typ corn har avses omf attar en snacka 8, vilken medelst ett snaekhjul 9 driver axeln 5. En drivaxel 10, som i sin fur driver denna snacka,'dr genom en elektro magnetisk koppling 12 f8rbunden med ett svanghjul 11 och kan bromsas med en elektromagnetisk broms 13, nar kopplingen 12, vid svanghjulets vridning under paverkan av pressens motor och av remmar som angripa remskivan 14, frhnkopplas, medan bromsen trader i funktion. A press of the corn type is intended to comprise a tongue 8, which by means of a screw wheel 9 drives the shaft 5. A drive shaft 10, which in its fur drives this blade, is connected by an electromagnetic coupling 12 to a flywheel 11 and can is braked with an electromagnetic brake 13, when the clutch 12, when the flywheel is rotated under the influence of the press motor and of belts which engage the pulley 14, is disengaged while the brake is in operation.

Hur snabba dessa funktioner an ma vara, maste man alltid rakna med trogheten hoc snackan 8, axeln 10 och de massor som aro riirelse i kopplingen 12 och bromsen 13. Med hansyn till den kraftiga nedvaxling som den mellanliggande snackan astadkommer kan denna troghet vara tillracklig for att Ora ett missode oundvikligt. How fast these functions may be, one must always trace with the inertia hoc the tongue 8, the shaft 10 and the masses which are in motion in the clutch 12 and the brake 13. In view of the strong downshifting which the intermediate tongue achieves, this inertia can be sufficient for that Ora a missode inevitable.

Foreliggande uppfinning bar till andamal att oberoende av vanliga sakerhetsatgarder, vilka gá ut pa att stoppa pressen, forhindra att flagon som heist rotation av snaekan kan uppkomma sh att digeln, vars rorelse man onskar avbryta tvart, darigenom rnedbringas. The object of the present invention is to prevent, independently of ordinary safety measures, which were intended to stop the press, the flakes which, in the event of rotation of the snake, may arise so that the crucible, the movement of which one wishes to interrupt abruptly, is thereby reduced.

Detta andamal uppnas genom att snackan gores axiellt rorlig gentemot organ som fastballa denna med ett tryck som ãr minst lika med det frau pressens norraala drift harrorande trycket, varvid snackans axiella forskjutning majliggores nar namnda tryck Overstiger ett fOrutbestamt varde. This object is achieved by making the snack axially movable towards means which fasten it to a pressure which is at least equal to the pressure of the normal operation of the press, the axial displacement of the snack being made possible when said pressure exceeds a predetermined value.

Bifogade ritning visar tva sa.som exempel givna utforingsformer av foremalet fOr uppfinningen. Fig. 2a och 2b, vilka utgora en fortsdttning av varandra i den meningen aft fig. 2b bor taga plats till vanster om fig. 2a, avse en forsta utforingsform, vilken dessa figurer visa i delvis axiell sektion och delvis i tva olika lagen, dels for normal funktion och dels for urkoppling vid overbelastning. Fig. 3 är en liknande axialsektion genom den vanstra delen av fig. 2b, tagen i rat vinkel mot ritningens plan. Fig. 4 är en andvy i halvsektion av stang- 2— — en (23, 24) i en del av de foreghende figurerna. Fig. 5, som avser en andra uttOringsform, visar en axiell halvsektion genom den del som skulle befinna sig vid vanstra anden av anordningen enligt fig. 2b. The accompanying drawing shows two exemplary embodiments of the object of the invention. Figs. 2a and 2b, which constitute a continuation of each other in the sense that Fig. 2b should take place to the left of Fig. 2a, refer to a first embodiment, which these figures show in partly axial section and partly in two different layers, partly for normal operation and partly for disconnection in case of overload. Fig. 3 is a similar axial section through the left part of Fig. 2b, taken at right angles to the plane of the drawing. Fig. 4 is a half-sectional view of the rod (23, 24) in a part of the preceding figures. Fig. 5, which relates to a second embodiment, shows an axial half section through the part which would be located at the left end of the device according to Fig. 2b.

I den forsta, i fig. 2-4 visade utforingsformen igenkannas en del av sndckan vid 8 och en del av dess drivaxel i tvd olika lagen vid 10 och 10'. Snackans rotationsriktning anges med en pil, och det av snackan utovade trycket her den riktning pilen 15 visar. In the first embodiment shown in Figs. 2-4, a part of the sink at 8 and a part of its drive shaft are recognized in two different layers at 10 and 10 '. The direction of rotation of the snack is indicated by an arrow, and the pressure exerted by the snack here is the direction the arrow 15 shows.

Den halft av figurerna 2a och 2b som befinner sig ovanfor den geometriska axeln har foljande sammansattning: Snackans 8 axel 10 slutar med ett pa langden raffia huvud 16 som medbringas av en muff 17, vilken dr rafflad ph liknande salt och i sin tur är forbunden med drivorganen, 1. ex. den elektromagnetiska kopplingen 12 och svanghjulet 11 i fig. 1. The half of Figures 2a and 2b located above the geometric axis has the following composition: The axis 10 of the snack 8 ends with a longitudinal raffia head 16 which is carried by a sleeve 17, which there is a grooved ph similar to salt and in turn is connected to the drive means, 1. ex. the electromagnetic clutch 12 and the flywheel 11 in Fig. 1.

Axelns 10 motsatta, fria ande avslutas med rullbanor for tva rullager, varav det ena 18 är cylindriskt radiallager och det andra 19 fir ett axiallager, vilka verka i bada riktningarna for axiell forskjutning, varigenom yttercylindern 20, genom att innehalla de yttre rullbanorna, medfoljer axeln saval ndr denna ror sig fram- som bakat. For detta andamal ãr cylindern axiellt glidbar i stativet 21. I cylinderns forlfingning finns en konisk muff 22, vid vars fria ande en axiell slang med rektangular profil fir fast, vilken her en mindre 23 och en stone sektion 24 (se fig. 3, ddr denna skillnad framtrader). The opposite, free end of the shaft 10 terminates with roller tracks for two roller bearings, one 18 of which is cylindrical radial bearing and the other 19 of an axial bearing, which act in both directions for axial displacement, whereby the outer cylinder 20, by containing the outer roller tracks, accompanies the shaft saval ndr this moves forward- as baked. For this purpose the cylinder is axially slidable in the frame 21. In the extension of the cylinder there is a conical sleeve 22, at the free end of which an axial hose with a rectangular profile is fixed, which here is a smaller 23 and a stone section 24 (see fig. 3, ddr this difference emerges).

Den rektangulara sektionen 23 stracker sig genom en motsvarande appning i forslutningsplattan 25 till ett hOlje vilket innehdller de -vasentliga delarna av den egentliga sakerhetsanordningen. The rectangular section 23 extends through a corresponding opening in the closure plate 25 to a housing which contains the essential parts of the actual safety device.

Genom att stangdelen 23 är av rektanguldr eller fyrkantig sektion, kan denna del icke vrida sig, lika litet som den dfirmed forenade muffen 22 eller cylindern 20. Endast den fria linden av snackans axel kan samtidigt vridas och forskjutas axielIt. Det som befinner sig till vanster darom pa ritningen kan endast forskj utas axiellt. Because the rod part 23 is of rectangular gold or square section, this part cannot rotate, as small as the joint sleeve 22 or the cylinder 20 connected thereto. Only the free winding of the snack shaft can be rotated and displaced axially at the same time. What is to the left of it in the drawing can only be shifted axially.

Om man betraktar fig. 2b, ser man att den fria anden av den forutnb.mnda stangens rektangulara del 24 anligger mot ett utsprang 26 pa en klamback 27, vilken har en rak del som anligger mot stangen och vid 28 är ledbart fast vid en lank 29, som sjalv Sr svangbar pa en stational- axel 30, vilken fir fast forenad med ett forslutningsplattan 25 motsatt lock 31. Looking at Fig. 2b, it can be seen that the free spirit of the rectangular portion 24 of the aforesaid rod abuts against a projection 26 on a clamping jaw 27, which has a straight portion abutting the rod and at 28 is articulated at a long 29, which itself is pivotable on a station shaft 30, which is fixedly joined to a closure plate 31 opposite the closure plate 25.

En stang 32, som slutar i en spets och star under paverkan av kraftiga fjaderbrickor 33 anligger mot ledtappen 28 f8r att motverka att denna avla.gsnar sig fran stangens 24 geometriska axel, vilken Sr gemensam for axeln 10 och snfickan 8. A rod 32, which terminates in a tip and stands under the influence of strong spring washers 33, abuts against the pivot pin 28 to prevent it from being detached from the geometric axis of the rod 24, which is common to the shaft 10 and the snow pocket 8.

En genomborrad mutter 34 genomgas av stangen 32 och styr darigenom denna, och muttrar 35 Ora det mOjligt att reglera stang ens lopp sa att denna normalt hailer klambacken 27 i det lage som visas pa ritningen.. A pierced nut 34 is passed through the rod 32 and thereby guides it, and the nuts 35 make it possible to regulate the barrel's travel so that it normally holds the clamping jaw 27 in the position shown in the drawing.

Den beskrivna anordningen bildar tillsammans med en darmed halt symmetrisk, motstaende anordning ett anslag vilket med en viss (15) som snackan utOvar nar pressen är i drift. The described device together with a thus symmetrical, opposing device forms an abutment which with a certain (15) as the snack utOvar when the press is in operation.

Det mal som efterstravas Sr emellertid att snackan skall kunna forskjutas axiellt nar denna . The goal that is sought, however, is that the snack can be displaced axially when this.

Den nedre Millen av fig. 2a och 2b visar hur anordningen fungerar och de hittills beskrivna organen aterfinnas har, forsedda med index. The lower mill of Figs. 2a and 2b shows how the device works and the means described so far have been provided with indexes.

Nar axeln 10 skjutits fram till 10' tillsammans med snackan och dess rullager, har cylinder. 20 skjutits fram till 20' och muff en 22 till 22'. When the shaft 10 is pushed up to 10 'together with the snack and its roller bearings, has cylinder. 20 pushed up to 20 'and sleeve a 22 to 22'.

Det torde observeras att den yttre rullbanan 36 for det cylindriska rullagret 18 Sr Whackligt lang fOr att mojliggora en dylik forskjutning. It should be noted that the outer roller track 36 for the cylindrical roller bearing 18 is very long to allow such a displacement.

Nar stangdelen 24 forskjuter klfimbacken (egentligen tva rnotstande symmetriska klambackar), tvingar den ledtappen 28 att avlagsna sig fran anordningens geometriska axel genom att i sin tur forskjuta motsvarande stang 32. Nfir utspranget 26 slutligen lamnar den rektangulara stangen, kommer man fram till det laze som visas nederst pa figuren. When the rod part 24 displaces the clamping jaw (actually two adjacent symmetrical clamping jaws), the guide pin 28 is forced to move away from the geometric axis of the device by in turn displacing the corresponding rod 32. After the projection 26 finally leaves the rectangular rod, one arrives at the laze is shown at the bottom of the figure.

Stangen 23-24 skjutes darvid fram till la-get 23'-24', klambacken forflyttas till 27' i anliggning mot sthngen, som glider undan klambacken och de ovriga elementen intaga lagena 28', 29' och 32'. The rod 23-24 is then pushed up to the layer 23'-24 ', the clamping jaw is moved to 27' in abutment against the rod, which slides away from the clamping jaw and the other elements occupy the layers 28 ', 29' and 32 '.

Ett elastiskt anslag 37, vars lage kan regleras med en. mutter 38, Tarter slutligen en tapp 39 i anden av stangen 24 och dampar stoten. An elastic stop 37, the bearing of which can be adjusted by one. nut 38, Tarter finally a pin 39 in the spirit of the rod 24 and steams the shock.

Det Si tydligt att detta andlage icke alltid nas. I manga fall stannas pressen sa snabbt att redan en brakdel av den nyss beskrivna forskjutningen Sr tillrficklig for att undvika skadeverkningar. I sh fall frigores huvudet 16 icke fran muffen 17 och hela anordningen kan utan vidare 'Ater fungera normalt sd snart orsaken till att pressen stantiat har eliminerats och denna ater satts igang. It is clear that this spirit is not always present. In many cases, the press stops so quickly that even a fraction of the displacement just described is sufficient to avoid harmful effects. In this case the head 16 is not released from the sleeve 17 and the whole device can function normally without further ado as soon as the reason why the press has been eliminated and this is started again.

Om daremot andlaget nas, komma huvudet 16 och muffen 17 att hell skiljas at. I sa fall maste man emellertid tillse att rekylrorelse undvikes, ty en sadan skulle ha till foljd att det ena (16) av dessa organ slungas mot det andra (17) under inverkan av t. ex. det tryck, vilket den drivna digeln fir utsatt for, och kugghjulets 9 stravan att ga tillbaka (fig. 1). If, on the other hand, the spirit is nasalized, the head 16 and the sleeve 17 will be separated. In such a case, however, care must be taken to ensure that recoil movement is avoided, since such would result in one (16) of these members being thrown towards the other (17) under the influence of e.g. the pressure to which the driven crucible is subjected, and the pinion of the gear 9 to return (Fig. 1).

Av denna orsak innefattar den beskrivna konstruktionen en lasningsanordning for de helt urkopplade elementen, dvs. for stangen 23 —24, sedan denna kommit fram till laget 23' —24'. Hur detta sakerhetslas fungerar framgar om man studerar fig. 3. For this reason, the described construction comprises a welding device for the completely disconnected elements, i.e. for the rod 23-24, after this has reached the team 23'-24 '. How this security load works can be seen if you study Fig. 3.

Pa. fig. 3 aterfinnas stangdelarna 23 och 24 och deras forskjutna lage 23' och 24', men — —3 medan fig. 2b motsvarade snittet x—x i fig. 4, motsvarar fig. 3 snittet y—y, vilket ligger i rat vinkel mot det foreghende. Pa. Fig. 3 shows the rod parts 23 and 24 and their offset layers 23 'and 24', but while Fig. 2b corresponds to the section x — x in Fig. 4, Fig. 3 corresponds to the section y — y, which is at right angles to the foregoing.

Ph fig. 3 aterfinnes vidare anslaget 37, mot vilket tappen 39 kommer att anligga. Mellan fjaderbrickorna pa den med anslaget 39 forsedda stangen inforas havarmar 40, vilka utOra en del av klor 41, som aro svangbara pa fasta axlar 42. Den nedre halften av figuren visar dessa organ i deras inkopplade lage 40'-41'. Ph Fig. 3 further shows the stop 37, against which the pin 39 will abut. Between the spring washers on the rod provided with the stop 39, sea arms 40 are inserted, which form a part of the claws 41, which are pivotable on fixed shafts 42. The lower half of the figure shows these members in their connected bearing 40'-41 '.

I detta lage tranger klon in i en. motsvarande urtagning 43 i stangens del 24 och fast-hailer eller laser denna del mot varje rekylr5relse. Denna ar salunda sparrad i ett lage, dar fOrbindelsen mellan 16 och 17 (se fig. 2a) ãr bruten. In this layer, the clone penetrates into one. corresponding recess 43 in the part 24 of the rod and fastens or lasers this part against each recoil movement. This is thus locked in a layer where the connection between 16 and 17 (see Fig. 2a) is broken.

Sedan man genom att sparra pressen astadkommit en sadan fullstandig urkoppling och eliminerat orsakerna till att pressen stannat, sattes anordningen ger igang genom att muttern 38 skruvas av och stangen, p. vilken muttern ãr skruvad och som uppbar anslaget 37, skjutes i riktning mat. Klorna 41 komma darvid att skiljas frau varandra och stangen 2324 kommer att atertaga sitt utgangslage, medan 16 Ater kommer i ingrepp med 17. After sparring the press to achieve such a complete disconnection and eliminating the reasons why the press stopped, the device was started by unscrewing the nut 38 and the rod, on which the nut is screwed and which carried the stop 37, is pushed in the direction of food. The claws 41 will then be separated from each other and the rod 2324 will resume its initial position, while 16 Aters will engage with 17.

Da en press av den avsedda typen omfattar atskilliga sakerhetselement, sarskilt kontakter som hro fordelade pa olika stallen och vilka reglera stramkretsar, som astadkomma att maskinen ogonblickligen stannar under vissa omstandigheter, är det tydligt att man i samband med den beskrivna mekanismen skulle kunna anordna sadana sakerhetskontakter som avbryta pressens drift sh snart denna mekanism phverkas pa ell eller annat salt. Since a press of the intended type comprises several safety elements, in particular contacts which are distributed in different places and which regulate tight circuits, which cause the machine to stop instantly under certain circumstances, it is clear that such safety contacts could be arranged in connection with the described mechanism. which interrupts the operation of the press as soon as this mechanism is affected by electricity or other salt.

Fig 5, som avser en andra utforingsform, aterger i axiell sektion den del av mekanismen som motsvarar vad som visas ph fig. 2b, dvs. anden av den stang som bildar fortsattning av snackans axel och som icke är -vridbar, sasom i fallet 23-24. Fig. 5, which relates to a second embodiment, reproduces in axial section the part of the mechanism which corresponds to what is shown in Fig. 2b, i.e. the spirit of the rod which forms a continuation of the shaft of the snack and which is not rotatable, as in the case 23-24.

Stangdelen 43, vilken skulle vara f5renad med den forut beskrivna muff en 22, fortsatter har med element av fyrkantig sektion, av vilka det sista 44 slutar med ett profilerat huvud 45, som fOregas av en urtagning 46. The rod portion 43, which would be flush with the previously described sleeve 22, continues to have square section elements, the last 44 of which terminates with a profiled head 45, which is preceded by a recess 46.

En havarm 47, som slutar med en tand 48 och star under tryck av en stang 49, Aiken är omsluten av fjaderbrickor 50, fasthaller normalt huvudet 45 med sin tand 48. En likadan, diametralt motsatt havarm bor vara sym',netriskt anordnad i forhallande till namnda arm. An orifice 47, which terminates with a tooth 48 and is under the pressure of a rod 49, Aiken is enclosed by spring washers 50, normally holds the head 45 with its tooth 48. A similar, diametrically opposite orifice should be symmetrically arranged in relation to said arm.

Nar 44 onskas rora sig framat (at Amster pa ritningen), maste huvudet 45 lyfta tanderna 48 och, om denna lyftningsrorelse fortgar och är tillräckligt kraftig, kommer huvudet att lyfta tanderna tills dessa sankas ned i urtagningarna 46. Detta utgor det yttersta laget for urkoppling och lhsning i urkopplat lage. When 44 is desired to move forward (at Amster in the drawing), the head 45 must lift the teeth 48 and, if this lifting movement continues and is strong enough, the head will lift the teeth until they are lowered into the recesses 46. This constitutes the outermost layer for disconnection and lhsning in disconnected mode.

I detta fall är det onodigt att anordna sar skilda lasningsorgan, som i den forsta utf6- ringsformen. In this case, it is unnecessary to provide very different welding means, as in the first embodiment.

F5r att aterfora det hela i lage for normal funktion, behover man, efter att ha avlagsnat locket 51, endast skilja havarmarna 47 frail varandra och skjuta 44 bakat. F8r detta andamal ha dessa havarmar urtag 52 i vilka man kan infora de spetsiga andarna av ett verktyg, som ãr avsett att skilja dessa fran varandra mot verkan av deras tryckfjadrar 50. In order to return the whole to normal operation, after removing the cover 51, one only needs to separate the sea arms 47 from each other and push 44 backwards. For this purpose, these sea arms have recesses 52 into which the pointed spirits of a tool can be inserted, which are intended to separate them from each other against the action of their compression springs 50.

I de beskrivna och -visade exemplen astadkommes det tryck som utovas av de organ, vilka fasthalla snackan i drivande lage, pa mekanisk vag. In the examples described and shown, the pressure exerted by the means which hold the tongue in the driving position is provided mechanically.

Det är tydligt att *awn andra medel kunna anvandas fOr detta a.ndamal. It is clear that * awn other means can be used for this a.ndamal.

I synnerhet skulle man kunna fasthalla snackan genom att anvanda ett fluidum som forsatts under tryck medelst det av snackan utovade trycket, dvs. anvanda hydrauliska eller pneumatiska medel. Storleken av detta tryck skulle exempelvis kunna regleras med en ventil, vilken i sa fall horde ha den egenskapen att den oppnas, st att den haftigt frilagger en stor sektion, nar det tillatna arbetstrycket passerat ett forutbestamt varde. In particular, one could hold the snack by using a fluid which was pressurized by the pressure exerted by the snack, i.e. use hydraulic or pneumatic means. The magnitude of this pressure could, for example, be regulated with a valve, which in that case should have the property that it is opened, so that it violently exposes a large section when the permissible working pressure has passed a predetermined value.

Genom att I. ex. fasthalla snackan medelst en kolv uppnar man den flirdelen att man, sedan avloppsoppningen i kolvens cylinder stangts, kan anvanda det under tryck varande fluidet (hydraulisk eller pneumatisk domkraft) fOr att f6ra tillbaka snackan i normalt arbetslage. By I. ex. holding the snack by means of a piston achieves the additional part that, after the drain opening in the cylinder of the piston has been closed, the pressurized fluid (hydraulic or pneumatic jack) can be used to return the snack to normal working conditions.

Det torde liven observeras, att sakerhetsorganen i de beskrivna och visade exemplen aro instangda i slutna utrymmen. Darmed är det mOjligt att plombera samtliga de organ som lamna tilltrade till dessa utrymmen, liksom regleringsorganen for det mot snackan utovade trycket, varigenom det blir mojligt att sakerstalla kontroll av anordningen och undvika varje sadan manover som kan foranleda storningar eller andringar i anordningens arbets egenskaper. It should be observed that the security organs in the described and shown examples are trapped in enclosed spaces. Thus, it is possible to seal all the means which left access to these spaces, as well as the regulating means for the pressure exerted against the snack, whereby it becomes possible to objectify control of the device and avoid any such maneuver which may cause disturbances or changes in the device's working properties.

Claims

Patent claim:

Safety device against involuntary overloads in a crucible press with a movable crucible (2) driven by a tong (8), characterized in that the tong (8) is axially movable towards means which hold it in a driving Idge with a pressure which is mint equal to the normal operation of the frau press harrowing the pressure, but to cause the axial displacement of the snack (8) out of engagement when said pressure exceeds a predetermined value.

2. Device according to claim 1, characterized in that the shaft (10) of the snack is divided into two parts, one of which drives the snack and the other is fixedly connected to the 4 - - saw, the coupling (16, 17) of these parts being challenge in such a way, that in addition to a given, axial displacement of the sphincter (8) the had parts Oro disconnected from each other.

Device according to claim 1 and 2, characterized in that the shaft part (10) fastened to the tongue (8) is connected to a rod (23, 24) which is coaxially formed, but not rotatable, the rod (23, 24 ) is held axially against the pressure which the snack (8) imparts to it by means of means (27-30, 32-35) which yield to said pressures, if this exceeds a predetermined value.

Device according to claim 1, 2 and 3, characterized in that the rod (23, 24), which is coaxial with the shaft part, n (10) fastened to the tongue (8), cooperates with means (40-42) which hold this as soon as its axial displacement exceeds a given vfirde.

Device according to patent claims 1 and 2, characterized in that the rod (23, 24) abuts a protrusion (26) on at least one knife sea fabric (27-30) which causes the displacement of the rod (23, 24) under the influence of sn5. The pressure of the shaft tends to separate from the axis of said rod against the action of an elastic pressure, said projection (26) being dimensioned so that it slides away from the hose (24) when its projection exceeds a given value.

Device according to claim 1, 2 and 3, characterized in that the holding means (40-42) consist of at least one kb o (41) which hangs into a corresponding recess (43) on the rod (24).

Device according to patent claims 1, 2, 3 and 6, characterized by an elastic stop (37) with an installable bearing, which the rod reaches at the end of its operation, the clone or claws (41) being supported by this stop (37) in to which they are elastically movable in the axial direction.

Device according to claim 1 and 2, characterized in that a head (45) at the bar of the rod (43, 44), behind which at least one recess (46) is arranged, abuts against a land (48) on at least one sea arm ( 47) which elastic means (49, 50) cause to abut against the rod, whereby the landings or teeth (48) counteract axial displacement of the rod (43, 44) and hold it by sliding down into the recess or recesses (46) when the rod (43, 44) displaced to a predetermined degree.

Device according to patent claims 1, 2 and 8, characterized in that the lever arm or the sea arms (47) are designed so that they can receive a tool intended to separate the woman from the shaft of the rod.

10. Device according to claim 1, characterized in that the back pressure axially exerted against the tongue (8) is effected by mechanical means.

Device according to claim 1, characterized in that the back pressure axially exerted on the tongue (8) is provided by hydraulic means.

Device according to patent claim 1, characterized in that the back pressure exerted axially on the tongue (8) is provided by pneumatic means. Request publications: