DK143693B

DK143693B - EXPRESSION STAMP FOR HOLY CYLINDRIC STRESS PRESSURE CONTAINER

Info

Publication number: DK143693B
Application number: DK288177A
Authority: DK
Inventors: N Bay-Schmith
Original assignee: Bay Schmith N
Priority date: 1976-07-01
Filing date: 1977-06-28
Publication date: 1981-09-28
Also published as: DE2629682C3; DE2629682A1; CH617251A5; BE856268A; ES460344A1; GB1581938A; DK143693C; DE2629682B2; FR2356576B3; DK288177A; FR2356576A1

Description

(19) DANMARK (^f)(19) DENMARK (^ f)

|p (12) FREMLÆGGELSESSKRIFT od 1U3693B| p (12) PUBLICATION MANUAL OR 1U3693B

DIREKTORATET FOR PATENT- OG VAREMÆRKEVÆSENETDIRECTORATE OF THE PATENT AND TRADEMARKET SYSTEM

(21) Ansøgning nr. 2881/77 (51) tntCf.3 B 65 D 35/30 (22) Indleveringsdag 28. Jun. 1977 (24) Løbedag 28. jun. 1977 (41) Aim. tilgængelig 2. Jan. 1978 (44) Fremlagt 28. s ep. 1981 (86) International ansøgning nr. - (86) International indleveringsdag (85) Videreførelsesdag - (62) Stamansøgning nr. -(21) Application No. 2881/77 (51) tntCf.3 B 65 D 35/30 (22) Filing Date 28 Jun. 1977 (24) Race day 28 Jun. 1977 (41) Aim. available Jan. 2 1978 (44) Presented 28. s ep. 1981 (86) International application # - (86) International filing day (85) Continuation day - (62) Master application no -

(30) Prioritet 1. Jul. 1976, 2629682, DE(30) Priority 1 Jul. 1976, 2629682, DE

(71) Ansøger NIELS BAY-SCHMITH, 4050 Skibby, DK.(71) Applicant NIELS BAY-SCHMITH, 4050 Skibby, DK.

(72) Opfinder Samme.(72) Inventor Same.

(74) Fuldmægtig Plougmann & Vingtoft Patent bureau.(74) Plougmann & Vingtoft Patent Bureau.

(54) udpresningsstempel til hulcylin= drisk strengpresnlngsbeholder.(54) hollow cylindrical extrusion plunger = dry extrusion container.

Den foreliggende opfindelse angår et udpresningsstempel til en hulcylindrisk strengpresningsbeholder og med en SOm føringseleraent i strengpresningsbeholderen tjenende ringformet stempeldel, der har en cylindrisk ydre stempelvæg, samt en stempeltoppen dannende, ved den ene ende af den ringformede stempeldel anbragt, bøjelig lukkeskive, der ved sin bort fra stempeldelen vendende side er konvekst hvælvet.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extruder piston for a hollow cylindrical extruder container and with an annular guide member serving in the extruder receptacle having an annular piston portion having a cylindrical outer piston wall and a piston top forming at one end of the annular piston portion disposed therein, at a flexible closure disc. from the side of the piston part, convex is vaulted.

Et sådant udpresningsstempel kan f.eks. anvendes i en cylindrisk el- ® ler delcylindrisk beholder eller i en kartouche indeholdende en plas- ΓΟ ø·) tisk masse og beregnet til at blive indsat i en manuelt eller pneu- Φ matisk betjent udpresningspistol. Den cylindriske kartouche- ellerSuch an extruder stamp can e.g. is used in a cylindrical or partial cylindrical container or in a cartridge containing a plastic mass and intended to be inserted into a manually or pneumatically operated extruder gun. The cylindrical cartouche or

COCO

beholdervæg, der f.eks. kan bestå af plast eller pap, er ofte så eftergivelig, at man ved udpresning af beholderens indhold ikke jjJ opnår den ønskede tætning mellem stemplet og beholderens indervæg, O så at der ved stemplet kan optræde en lækage.container wall, e.g. can consist of plastic or cardboard, is often so resilient that when the contents of the container are pressed out, the desired seal between the plunger and the inner wall of the container is not obtained, so that a leakage can occur at the plunger.

2 1436932 143693

Tysk fremlæggelsesskrift nr. 2 034 047 beskriver et stempel af den ovenfor omtalte art, hvor den hvælvede lukkeskive på sin konkave side er forsynet med en anlægsribbe, der kan ligge an mod pistolens stempel. Denne anlægsribbe er således udformet, at det derpå udøvede udpresningstryk fører til en formindskelse af lukkeskivens hvælving og således til en forbedring af berøringen og tætningen mellem lukkeskivens væg og beholderens inderflade. Ved det omtalte kendte stempel, hvor den ringformede stempeldel eller stempelskørtet er stift forbundet med lukkeskiven langs dennes rand, modvirkes den ønskede hvælvingsformindskelse eller udfladning af lukkeskiven i et uheldigt stort omfang af den stive forbindelse mellem lukkeskiven og stempelskørtet.German Patent Specification No. 2 034 047 discloses a piston of the kind mentioned above, in which the vaulted closure plate is provided on its concave side with a abutment rib which can abut against the piston of the gun. This abutment rib is designed so that the pressing pressure exerted thereon leads to a reduction of the vault of the closure plate and thus to an improvement in the contact and seal between the wall of the closure plate and the inner surface of the container. In the aforementioned known piston, in which the annular piston part or piston skirt is rigidly connected to the closure disk along its edge, the desired vault reduction or flattening of the closure disc is counteracted to an undue extent by the rigid connection between the closure disc and the piston skirt.

Ved opfindelsen søges tilvejebragt et udpresningsstempel af den ovenfor omhandlede art, der muliggør en forbedret tætning mellem stemplet og den dermed samarbejdende indervæg af beholderen. Dette opnås ved stemplet ifølge opfindelsen, der er ejendommeligt ved, at lukkeskiven har en fri, radialt udragende randdel, og at den ringformede stempeldel og lukkeskiven er udformet aksialt forskydelig i forhold til hinanden mod og bort fra en stilling, i hvilken den ringformede stempeldel ligger an mod lukkeskivens randdel på en sådan måde, at den kan overføre en udpresningskraft til denne.The invention seeks to provide an extruder piston of the above-mentioned type which enables an improved seal between the piston and the cooperating inner wall of the container. This is achieved by the piston according to the invention, characterized in that the closure disc has a free, radially protruding edge part and that the annular piston part and the closure disc are axially displaceable relative to each other towards and away from a position in which the annular piston part lies. abut against the edge portion of the closure plate in such a way that it can transmit a compressive force thereto.

Den ringformede stempeldel, hvis yderdiameter hovedsagelig svarer til den cylindriske beholders inderdiameter, tjener på kendt måde som stempelføringselement og trykkes under udpresningsoperationen indefter i beholderen, f.eks. ved hjælp af en manuelt eller med trykluft betjent udpresningspistol. Derved bringes den ringformede stempeldel til at ligge an mod lukkeskivens mere eller mindre bøjelige randdel. Det tryk, som den i beholderen værende masse udøver på lukkeskiven, og det tryk, som den ringformede stempeldel udøver på lukkeskivens randdel, virker i retning af at formindske lukkeskivens hvælving, hvorfor lukkeskivens frie rand, der normalt vil være udformet mere eller mindre skarpkantet, under en udpresnings-operation altid vil blive presset i tætnende anlæg mod beholderens indervæg.The annular piston member, the outer diameter of which corresponds mainly to the inner diameter of the cylindrical container, serves in a known manner as a piston guide element and is pressed into the container during the pressing operation, e.g. using a manual or compressed air operated extruder. This causes the annular piston portion to abut against the more or less flexible edge portion of the closure disc. The pressure exerted by the mass in the container on the closure disk and the pressure exerted by the annular piston member on the rim portion of the closure disk act towards reducing the vault of the closure disk, so that the free edge of the closure disk, which would normally be more or less sharply edged, during an extruding operation will always be pressed into sealing systems against the inner wall of the container.

Lukkeskiven og den ringformede stempeldel kan fremstilles og anvendes som separate, ikke-forbundne dele. I det tilfælde kan den ringformede stempeldel fordelagtigt dannes af en del af stemplet i en tilhørende udpresningspistol. Den ringformede stempeldel og lukkeskiven kan imidlertid ifølge opfindelsen fordelagtigt være forbundet ved hjælp af mindst én bøjelig eller sammenklappelig forbindelsesdel, hvilket 3 143693 giver fordele i forbindelse med fremstilling og montering af stemplet. Forbindelsesdelen kan ifølge opfindelsen fordelagtigt udgøres af en rundtgående, sammenfoldelig eller sammenklappelig, tætlukkende vægdel, så at eventuelt lækagemasse ikke ved at passere mellem den ringformede stempeldel og lukkeskiven kan trænge ind i den centrale indre del af stemplet. Den sammenklappelige eller sammenfoldelige udformning af den nævnte vægdel eller forbindelsesdel gør det muligt at trække de ved hjælp af forbindelsesdelen med hinanden forbundne stempeldele noget fra hinanden, hvilket, når stemplet fremstilles ved sprøjtestøbning, muliggør tilbagetrækning af formkernen. På henholdsvis den ringformede stempeldel og lukkeskiven kan der ifølge opfindelsen være udformet låsedele, der er således indrettet, at de, når den ringformede stempeldel og lukkeskiven trykkes aksialt mod hinanden, kan bringes til at indgribe med hinanden i én eller flere indbyrdes aksiale stillinger for den ringformede stempeldel og lukkeskiven. Lukkeskivens yderdiameter kan vælges således, at den i spændingsfri eller i hovedsagen spændingsfri tilstand let kan skubbes ind i den tilhørende cylindriske beholder uden at tætne helt mod denne, og luft, der under indskydningen af stemplet eventuelt måtte blive indesluttet i den cylindriske beholder kan da undvige, idet den kan strømme ud langs lukkeskivens rand. Derefter, og før udpresningsoperationen påbegyndes, kan den ringformede stempeldel og lukkeskiven trykkes således aksialt mod hinanden, at man opnår den ønskede tætning mellem lukkeskivens rand og beholderens indervag^ og idet låsedelene bringes til at indgribe med hinanden, kan den ringformede stempeldel og lukkeskiven fastholdes i denne indbyrdes, mod hinanden trykkede stilling. Låsedelene kan ifølge opfindelsen fordelagtigt være udformet således, at de tillader en yderligere aksial sammentrykning af den ringformede stempeldel og lukkeskiven.The closure washer and annular piston member can be manufactured and used as separate, non-bonded parts. In that case, the annular piston member may advantageously be formed by a portion of the piston in an associated extruder gun. However, the annular piston part and the closure disc according to the invention may advantageously be connected by at least one flexible or collapsible connecting part, which offers advantages in connection with the manufacture and assembly of the piston. According to the invention, the connecting member may advantageously be constituted by a circular, foldable or collapsible, close-closing wall part, so that any leakage mass cannot penetrate the central inner part of the plunger by passing between the annular piston part and the closing disc. The collapsible or collapsible configuration of said wall part or connecting part makes it possible to pull the piston parts connected by means of the connecting part somewhat apart, which, when the piston is manufactured by injection molding, allows retraction of the mold core. According to the invention, locking members may be formed on the annular piston part and the closure disc, respectively, which are arranged so that when the annular piston part and the closure disc are axially pressed against each other, they can be engaged with one another in one or more mutually axial positions thereof. annular piston part and the washer. The outer diameter of the closure disc can be selected such that it can be easily pushed into the associated cylindrical container in the stress-free or substantially stress-free state without sealing fully against it, and air which, if pushed into the piston, may then be enclosed in the cylindrical container. , as it can flow out along the edge of the closure disc. Then, and before the pressing operation commences, the annular piston part and the closure disc can be axially pressed against each other to obtain the desired seal between the rim of the closure disc and the inner wall of the container ^ and, by causing the locking members to engage with each other, the annular piston portion and the closure disc can be retained. this mutually pressed position. According to the invention, the locking members may advantageously be designed to allow further axial compression of the annular piston part and the closure disc.

I det følgende vil forskellige udførelsesform for stemplet ifølge opfindelsen blive nærmere beskrevet under henvisning til tegningen, på hvilken fig, 1 viser en strengpresningsbeholder set fra siden og delvis i snit, fig. 2 - 4 i større målestok delsnit, der viser en første udførelsesform for et med strengpresningsbeholderen samarbejdende stempel, og fig. 5 og 6 delsnit, der viser en anden udførelsesform for stemplet.In the following, various embodiments of the piston according to the invention will be described in greater detail with reference to the drawing, in which Fig. 1 shows a side-view and partial sectional extruder container; 2 - 4 in larger scale partial section showing a first embodiment of a piston cooperating with the extruder container, and fig. 5 and 6 are partial sections showing another embodiment of the piston.

4 1436934 143693

Fig. 1 viser en med en plastisk masse 10, f.eks. tætningsmasse, klæbemiddel eller et lignende materiale fyldt hulcylindrisk strengpresningsbeholder 11, der f.eks. kan være fremstillet af plast eller et andet elastisk eftergiveligt materiale. Beholderen 11 er ved sin ene ende lukket med et forskydeligt stempel 12 og ved sin anden ende lukket ved hjælp af en endevæg 13, der er forsynet med en udpresningstud 14. Stemplet 12 har en i retning mod beholderen 11's indre rum konvekst hvælvet lukkeskive 15, der danner stempeltoppen, og en fra lukkeskiven udefter ragende ringformet stempeldel 16.FIG. 1 shows one with a plastic mass 10, e.g. sealing compound, adhesive or a similar material filled with hollow cylindrical extruder 11, e.g. may be made of plastic or other resilient resilient material. The container 11 is closed at one end with a displaceable piston 12 and at its other end is closed by an end wall 13 provided with an extruder 14. The piston 12 has a convex curved disc 15, which is in the direction of the inner space of the container 11. forming the piston top and an annular piston portion 16 projecting from the closure disc.

Ved den i fig. 2-4 viste udførelsesform er lukkeskiven 15 og stem-peIdelen 16 forbundet med hinanden ved hjælp af en som en ringformet, rundtgående, tynd, sammenfoldelig vægdel udformet forbindelsesdel 17, Stemplet 12 kan f.eks. fremstilles ved sprøjtestøbning af plast, og som antydet i fig. 2 og 3 tillader den sammenfoldelige forbindelsesdel efter støbeoperationens afslutning udtrækning af formkerner 18, af hvilke der i fig. 2 og 3 kun er vist den ene.In the embodiment shown in FIG. 2-4, the closure washer 15 and the piston part 16 are connected to each other by means of a connecting part 17 formed as an annular, circumferential, thin, foldable wall part. are made by injection molding of plastic and as indicated in FIG. 2 and 3, after the completion of the casting operation, the collapsible connecting part allows the extraction of mold cores 18, of which in FIG. 2 and 3 are shown only one.

Når massen 10 skal trykkes ud af beholderen 11 gennem udpresningstuden 14, kan beholderen 11 f.eks. anbringes i en ikke-vist manuelt betjenelig eller trykluftsbetjent udpresningspistol eller en lignende indretning. Derefter udøves ved hjælp af et til udpresningspistolen hørende trykhovede 19 en indadrettet kraft, der i fig. 4 er antydet med en pil 20, på den ringformede stempeldel 16. Denne kraft overføres til lukkeskiven 15 langs en fri, bøjelig randdel 24 af denne og bevirker i kombination med den af massen 10 udøvede reaktionskraft, der i fig. 4 er antydet med en pil 21, en formindskelse af lukkeskiven 15's hvælving, hvorved lukkeskivens ydre rand, der kan være udformet som en ikke-vist tætningslæbe, presses fast og tæt mod beholderen 11's indervæg. Når kræfterne 20 og 21 tiltager, udflades lukkeskiven 15 endnu mere, hvorved der opnås en endnu bedre tætning mellem lukkeskivens rand og beholderens indervæg.When the mass 10 is to be pushed out of the container 11 through the extruder spout 14, the container 11 can e.g. is placed in a non-manually operated or compressed air operated extruder gun or similar device. Thereafter, an inwardly directed force is applied by means of a pressure head 19 of the extinguishing gun, which in FIG. 4 is indicated by an arrow 20, on the annular piston portion 16. This force is applied to the closure disk 15 along a free, flexible edge portion 24 thereof and, in combination with the reaction force exerted by the mass 10, exerted in FIG. 4 is indicated by an arrow 21, a decrease in the arch of the closure disc 15, whereby the outer edge of the closure disc, which may be formed as a non-sealing lip, is pressed firmly and tightly against the inner wall of the container 11. As forces 20 and 21 increase, the closure disc 15 flattens even more, thereby providing an even better seal between the rim of the closure disc and the inner wall of the container.

Ved den i fig. 5 og 6 viste udførelsesform findes der en krans af bøjelige eller sammenklappelige båndformede forbindelsesdele 17. Mellem hvert efter hinanden følgende par af forbindelsesdele 17 er der på lukkeskiven 15 udformet en aksialt udefter ragende, med paltænder forsynetIn the embodiment shown in FIG. 5 and 6, there is a wreath of flexible or collapsible band-shaped connecting members 17. Between successive pairs of connecting parts 17, an axially projecting axially outwardly projected with paw teeth is formed.

Claims

In the embodiment shown in FIG. 5 and 6, each locking part 22 is provided with two pawl teeth, each of which can cooperate with a radially inwardly projecting latching projection 23. In the tension-free state (Fig. 5), the closing washer 15 for the one shown in Figs. 5 and 6 preferably have an outer diameter such that, after filling the container 11 with the mass 10, the piston can easily and without difficulty be inserted into the open end of the container, while air trapped between the closing disc 15 and the mass 10 can simultaneously escape from the inner space of the container. The closing washer 15 and the annular piston member 16 can then be axially pressed against each other until the locking projections 23 can engage behind each of the pawl teeth on the locking members 22 (Fig. 6). Thus, when the piston members are axially pressed against each other, the arch of the closure disk 15 is reduced such that the edge of the closure disk is pressed firmly and tightly against the inner wall of the container, and the engaging portions 22 and 23 retain the closure disk 15 and the annular piston member 16 in this mutual axial position. When the washer 15 and piston portion 16 are pressed against each other, the connecting portions 17 are bent or compressed (see Fig. 6). Instead, the connecting members 17 may be designed to break apart during axial compression. The locking members 22 can be replaced by a single annular locking member provided with continuous annular pallet teeth. In this case, the flexible or collapsible connecting members 17 can e.g. start from the free edge of the locking part 22. Claims.

An extruder piston for a hollow cylindrical extruder container (11) and with an annular piston member (16) serving as a guide member in the extruder container having a cylindrical or partial cylindrical outer piston wall, and with a piston top forming at one end of the annular piston portion closure disc (15) if the side facing the annular piston part is convexly curved, characterized in that the closure disc has a free, radially projecting edge part (24) and that the annular piston part (16) and the closure disc (15) are formed axially displaceable in relation to each other towards and away from a position in which the annular piston member abuts against the edge portion of the closure plate in such a way that it can transmit a pressing force thereon.