EP0620047A1 - Piston for extrusion system - Google Patents

Piston for extrusion system Download PDF

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Publication number
EP0620047A1
EP0620047A1 EP93810758A EP93810758A EP0620047A1 EP 0620047 A1 EP0620047 A1 EP 0620047A1 EP 93810758 A EP93810758 A EP 93810758A EP 93810758 A EP93810758 A EP 93810758A EP 0620047 A1 EP0620047 A1 EP 0620047A1
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EP
European Patent Office
Prior art keywords
engagement part
piston
central engagement
central
scraper edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93810758A
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German (de)
French (fr)
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EP0620047B1 (en
Inventor
Sedlmeier Andreas
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Hilti AG
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Hilti AG
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Publication of EP0620047A1 publication Critical patent/EP0620047A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00583—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes the container for the material to be dispensed being deformable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/00576—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes characterised by the construction of a piston as pressure exerting means, or of the co-operating container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B05C17/005—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes
    • B05C17/01—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces for discharging material from a reservoir or container located in or on the hand tool through an outlet orifice by pressure without using surface contacting members like pads or brushes with manually mechanically or electrically actuated piston or the like

Definitions

  • the invention relates to a piston for a squeezing device for squeezing out masses located in plastic bags with a central engagement part for a piston rod and a stripping edge which projects radially beyond the engagement part and at least partially surrounds the engagement part.
  • German patent application P 42 31 420.8 discloses a piston of a squeezing device which is composed of two individual pistons, each individual piston having a central engagement part, being curved in the end region and having a wiping edge which projects radially beyond the surrounding part.
  • the plunger shown is located in a cylindrically shaped cassette part which receives film bags and is, for example, part of the squeezing device or can be inserted as a separate part into a squeezing device.
  • the piston which can be acted upon on both sides, is displaceably arranged in the cassette part.
  • a piston rod with thrust piece serves for the axial displacement of the piston.
  • the cassette part is open from both ends. After each pressing-out operation, the folded, pressed-out film bag is removed from the cassette part and a new film bag filled with mass is inserted, namely from that end which lies opposite the piston. After aligning the cassette part with the squeezing device, the cassette part is inserted into the squeezing device so that the next squeezing process can take place.
  • each individual piston has a storage space in the peripheral region of the central engagement part, which extends in each case from the end region of the individual piston to the wiping edge.
  • the known piston thus has two storage spaces arranged axially one behind the other, which are separated from one another by the scraper edges.
  • the overall length of the piston depends on the length of the storage spaces. The required considerable length of the storage spaces thus affects the overall length of the piston, the overall length of the cassette part and the overall length of the squeezing device.
  • the invention has for its object to provide a double-acting piston with two storage spaces, the piston having a length-reducing construction acting on the cassette part and the squeezer.
  • the piston located in the cassette part is supported on the inner wall of the cassette part via a sealing area of the scraper edge.
  • the central engagement part is displaced axially relative to the scraper edge.
  • the central engagement part and the scraper edge preferably have mutually interacting means, which combine the two parts into one unit.
  • Interacting means are expediently formed by projections of the scraper edge pointing towards the center.
  • the wiping edge is supported radially with respect to the central engagement part via these projections.
  • a corresponding design of the outer contour of the central engagement part and the free ends of the projections enables the wiper edge to be axially displaceable relative to the central one Assault part guaranteed.
  • the projections are arranged on the scraper edge in such a way that they protrude from the sealing area of the scraper edge.
  • the free end of the projections is preferably T-shaped.
  • the T-shaped configuration extends at least partially in the longitudinal direction and in the circumferential direction of the outer contour of the piston.
  • Interacting means of guides are advantageously formed on the central engagement part. So that the scraper edge can be axially offset with respect to the central engagement part, the outer contour of the central engagement part is designed such that a guide for the scraper edge is created.
  • the outer contour of the central engagement part is cylindrical, for example, and has a stop in each of the two end regions, which limits the axial displacement of the scraper edge.
  • the guides are preferably formed by slots which are open to the outer contour of the central engagement part and extend in the longitudinal direction of the central engagement part and which interact with correspondingly designed projections of the wiping edge.
  • These projections are designed at least so long that they protrude beyond the outer contour of the central engagement part in the radial direction or protrude through the slots into the interior of the central engagement part.
  • Those protrusions that protrude into the interior of the central engagement part can also be T-shaped. This T-shaped design also serves to ensure better tilting stability of the scraper edge compared to the central part of the attack.
  • the T-shaped end of the projections is supported in the radial direction on a guide surface of the piston running in the longitudinal direction of the piston.
  • the size of the storage spaces can be changed.
  • the slots serving to guide the scraper edge expediently extend over 70% to 90% of the total length of the central engagement part.
  • the pressing device shown in FIG. 1 consists of a central, cylindrical housing 1, to which a pressing nozzle 2 is connected in the pressing direction in connection with a closure element 3.
  • a cylindrical housing 1 In the cylindrical housing 1 there is a likewise cylindrical cassette part 4, which receives a foil bag 5 and the piston 6 according to the invention.
  • the entire feed mechanism 7 for a piston rod 8 is arranged in the rear area of the pressing device opposite the pressing direction.
  • a pressure piece 9 is arranged, which can be connected to the central engagement part 14 of the piston 6.
  • a handle part 10 In the rear area of the housing 1 there is also a handle part 10, to which a trigger lever 11 is fastened so as to be pivotable about an axis in the direction of the handle part 10.
  • the trigger lever 11 When the trigger lever 11 is actuated, the piston rod 8 is displaced in the squeezing direction with the aid of the feed mechanism 7.
  • the connection between the feed mechanism 7 and the piston rod 8 can be interrupted with the aid of an unlocking arm 12, so that the piston rod 8 can be pulled back freely, axially.
  • FIG. 2 shows an enlarged view of the cassette part 4, in which there is a film bag 5 filled with mass 13 and the piston 6 according to the invention.
  • the partially shown piston rod 8 in connection with the pressure piece 9 is also shown.
  • the piston 6 is shown in its starting position before the start of the squeezing process.
  • the piston 6 consists of two halves 16, 17 which are held together by means of a snap connection.
  • the snap connection consists of a claw-like arm 18 which projects from one half 16 of the piston 6 in the longitudinal direction of the piston 6 and engages behind a corresponding recess 19 in the second half 17 of the piston 6.
  • a corresponding entry slope 20 on the claw-like arm 18 ensures that when the two halves 16, 17 are joined together, a radial displacement of the claw-like arm 18 is possible before the latter can reach behind the corresponding recess 19.
  • the piston 6 has a plurality of substantially uniform slots 21 which are distributed around the circumference and extend in the longitudinal direction of the piston 6.
  • the slots 21 are formed closed, so that the longitudinal ends of the slots 21 serve as stops for projections 22 of the axially displaceable scraper edge 15.
  • the slots 21 are designed as radially extending through openings in the peripheral region of the central engagement part 14.
  • the circumferential width B of the slots 21 essentially corresponds to the circumferential thickness of the projections 22 of the scraper edge 15.
  • the wiping edge 15 projects beyond the central engagement part 14 in the radial direction and surrounds the central engagement part 14.
  • the radial support and the axial guidance of the wiping edge 15 with respect to the central engagement part 14 takes place via the projections 22 which extend from the sealing region 28 of the wiping edge 15 in the radial direction. Pointing towards the center.
  • the projections 22 consist of individual spokes, the free end of which is T-shaped.
  • the T-shaped design of the projections 22 is supported radially in the interior of the central engagement part 14 on a corresponding guide surface 23, so that the wiping edge 15 achieves better tilting stability compared to the central engagement part 14.
  • the slots 21 form guides in which the projections 22 are only axially displaceable.
  • the central engagement part 14 of the piston 6 has a central through bore 24, which serves to receive a closure element 25 of the foil bag 5.
  • the diameter of the through hole 24 widens towards the free ends in the end region of the central engagement part 14.
  • the smallest diameter of the through bore 24 can be found in the middle of the central engagement part 14, where both halves 16, 17 of the piston 6 meet.
  • the pressure piece 9 arranged on the piston rod 8 serves to entrain the piston 6 when the piston rod 8 is axially displaced.
  • the pressure piece 9 has a projection 27 protruding in the pressing-out direction from a pressure surface 26 in the pressing-out direction, which projection essentially corresponds to the contour of the through bore 24 in the end region of central attack part 14 is coordinated.
  • a storage space 29 formed in the peripheral region of the central engagement part 14 is open towards the piston rod 8.
  • the pressing-out process in which the mass 13 is pressed out of the film bag 5 with the aid of the piston 6 according to the invention and the piston rod 8 with the pressure piece 9, is shown in FIG. 3.
  • the sealing surface 28 of the scraper edge 15 bears on the inner wall of the cassette part 4. Due to the friction between the sealing area 28 of the scraper edge 15 and the inner wall of the cassette part 4, the scraper edge 15 maintains its position during the axial displacement of the central engagement part 14 until the projections 22 of the scraper edge 15 at one end of the radially formed as guides extending slots 21 of the central attack part 14 come to the plant.
  • the stripping edge 15 is carried along in the pressing direction.
  • a storage space 29 is created in the region of the piston 6 on the pressing-out direction. This storage space 29 serves to accommodate a part of the pressed-out, folded-up foil bag 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Coating Apparatus (AREA)
  • Fluid-Damping Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The piston (6) for an extrusion system for extruding masses situated in foil bags (5) has a central engagement part for a piston rod (8) and a stripping edge (15) which projects beyond the central engagement part (14), surrounds the central engagement part (14) at least partially and can be displaced axially limitedly in relation to the central engagement part (14). <IMAGE>

Description

Die Erfindung betrifft einen Kolben für ein Auspressgerät zum Auspressen von in Folienbeuteln befindlichen Massen mit einem zentralen Angriffsteil für eine Kolbenstange und eine das Angriffsteil radial überragende, das Angriffsteil wenigstens teilweise umgebende Abstreifkante.The invention relates to a piston for a squeezing device for squeezing out masses located in plastic bags with a central engagement part for a piston rod and a stripping edge which projects radially beyond the engagement part and at least partially surrounds the engagement part.

Für verschiedenste Anwendungen, insbesondere bei Gebäuden, werden heute ein- oder mehrkomponentige, aushärtbare Massen verwendet. Diese Massen werden im Handel in Kartuschen oder Folienbeuteln angeboten, die mit Hilfe entsprechender Auspressgeräte aus der Kartusche oder aus dem Folienbeutel ausgepresst werden können.For a wide variety of applications, particularly in buildings, single- or multi-component curable compositions are used today. These masses are commercially available in cartridges or plastic bags, which can be pressed out of the cartridge or the plastic bag with the help of appropriate squeezing devices.

Aus der deutschen Patentanmeldung P 42 31 420.8 ist ein aus zwei Einzelkolben zusammengesetzter Kolben eines Auspressgerätes bekannt, wobei jeder Einzelkolben ein zentrales Angriffsteil aufweist, im stirnseitigen Bereich gewölbt ausgebildet ist und eine das Angriffsteil radial überragende und umgebende Abstreifkante aufweist.German patent application P 42 31 420.8 discloses a piston of a squeezing device which is composed of two individual pistons, each individual piston having a central engagement part, being curved in the end region and having a wiping edge which projects radially beyond the surrounding part.

Der gezeigte Kolben befindet sich in einem zylindrisch ausgebildeten, Folienbeutel aufnehmenden Kassettenteil, welches beispielsweise Teil des Auspressgerätes ist, oder als separates Teil in ein Auspressgerät einlegbar ist. Der beidseitig beaufschlagbare Kolben ist in dem Kassettenteil verschieblich angeordnet. Der axialen Verschiebung des Kolbens dient eine Kolbenstange mit Druckstück. Das Kassettenteil ist von beiden Enden her offen ausgebildet. Nach jedem Auspressvorgang wird der zusammengefaltete, ausgepresste Folienbeutel aus dem Kassettenteil entfernt und ein neuer, mit Masse gefüllter Folienbeutel eingelegt und zwar von jenem stirnseitigen Ende her, welches dem Kolben gegenüberliegt. Nach dem Ausrichten des Kassettenteils gegenüber dem Auspressgerät wird das Kassettenteil in das Auspressgerät eingelegt, so dass der nächste Auspressvorgang stattfinden kann.The plunger shown is located in a cylindrically shaped cassette part which receives film bags and is, for example, part of the squeezing device or can be inserted as a separate part into a squeezing device. The piston, which can be acted upon on both sides, is displaceably arranged in the cassette part. A piston rod with thrust piece serves for the axial displacement of the piston. The cassette part is open from both ends. After each pressing-out operation, the folded, pressed-out film bag is removed from the cassette part and a new film bag filled with mass is inserted, namely from that end which lies opposite the piston. After aligning the cassette part with the squeezing device, the cassette part is inserted into the squeezing device so that the next squeezing process can take place.

Der während des Auspressvorganges sich zusammenfaltende Folienbeutel wird wenigstens teilweise im Umfangsbereich des zentralen Angriffsteils aufgenommen. Zu diesem Zweck ist der Kolben derartig ausgebildet, dass jeder Einzelkolben einen Stauraum im Umfangsbereich des zentralen Angriffsteils besitzt, der sich jeweils vom stirnseitigen Bereich des Einzelkolbens bis hin zur Abstreifkante erstreckt.The foil bag which folds up during the pressing-out process is at least partially received in the peripheral region of the central engagement part. For this purpose, the piston is designed in such a way that each individual piston has a storage space in the peripheral region of the central engagement part, which extends in each case from the end region of the individual piston to the wiping edge.

Der bekannte Kolben besitzt somit zwei axial hintereinander angeordnete Stauräume, die durch die Abstreifkanten voneinander getrennt sind. Die Baulänge des Kolbens hängt ab von der Länge der Stauräume. Die erforderliche erhebliche Länge der Stauräume wirkt sich somit auf die Baulänge des Kolbens, auf die Baulänge des Kassettenteils sowie auf die Baulänge des Auspressgerätes aus.The known piston thus has two storage spaces arranged axially one behind the other, which are separated from one another by the scraper edges. The overall length of the piston depends on the length of the storage spaces. The required considerable length of the storage spaces thus affects the overall length of the piston, the overall length of the cassette part and the overall length of the squeezing device.

Der Erfindung liegt die Aufgabe zugrunde, einen beidseitig beaufschlagbaren Kolben mit zwei Stauräumen zu schaffen, wobei der Kolben eine sich längenreduzierend auf das Kassettenteil und das Auspressgerät wirkende Bauweise aufweist.The invention has for its object to provide a double-acting piston with two storage spaces, the piston having a length-reducing construction acting on the cassette part and the squeezer.

Erfindungsgemäss wird dies dadurch erreicht, dass die Abstreifkante gegenüber dem zentralen Angriffsteil axial begrenzt versetzbar ist.This is achieved according to the invention in that the scraper edge can be displaced axially to a limited extent with respect to the central engagement part.

Der sich in dem Kassettenteil befindliche Kolben stützt sich über einen Dichtbereich der Abstreifkante an der Innenwandung des Kassettenteiles ab. Beim axialen Versetzen des Kolbens erfolgt eine axiale Versetzung des zentralen Angriffsteils gegenüber der Abstreifkante. Durch das Versetzen der Abstreifkante gegenüber dem zentralen Angriffsteil entsteht im auspressrichtungsseitigen Umfangsbereich des zentralen Angriffsteils ein ausreichend grosser Stauraum für einen Teil eines sich im Kassettenteil befindlichen, ausgepressten, zusammengefalteten Folienbeutels. Der gegenüberlie-gende Stauraum wird dabei entsprechend kleiner.The piston located in the cassette part is supported on the inner wall of the cassette part via a sealing area of the scraper edge. When the piston is axially displaced, the central engagement part is displaced axially relative to the scraper edge. By displacing the scraper edge with respect to the central engagement part, a sufficiently large storage space is created in the peripheral region of the central engagement part on the pressing-out direction for a part of a pressed-out, folded-up foil bag located in the cassette part. The opposite storage space is correspondingly smaller.

Zur begrenzten axialen Versetzbarkeit weist das zentrale Angriffsteil und die Abstreifkante vorzugsweise miteinander zusammenwirkende Mittel auf, welche beide Teile zu einer Einheit vereinigen.For limited axial displaceability, the central engagement part and the scraper edge preferably have mutually interacting means, which combine the two parts into one unit.

Zweckmässigerweise sind miteinander zusammenwirkende Mittel von in Richtung Zentrum weisenden Vorsprüngen der Abstreifkante gebildet. Über diese Vorsprünge stützt sich die Abstreifkante radial gegenüber dem zentralen Angriffsteil ab. Durch eine entsprechende Ausgestaltung der Aussenkontur des zentralen Angriffsteils und der freien Enden der Vorsprünge wird eine axiale Verschiebbarkeit der Abstreifkante gegenüber dem zentralen Angriffsteil gewährleistet. Die Vorsprünge sind derart an der Abstreifkante angeordnet, dass sie vom Dichtbereich der Abstreifkante abragen.Interacting means are expediently formed by projections of the scraper edge pointing towards the center. The wiping edge is supported radially with respect to the central engagement part via these projections. A corresponding design of the outer contour of the central engagement part and the free ends of the projections enables the wiper edge to be axially displaceable relative to the central one Assault part guaranteed. The projections are arranged on the scraper edge in such a way that they protrude from the sealing area of the scraper edge.

Um eine bessere Kippstabilität der Abstreifkante gegenüber dem zentralen Angriffsteil erreichen zu können, ist das freie Ende der Vorsprünge vorzugsweise T-förmig ausgebildet. Die T-förmige Ausbildung erstreckt sich dabei wenigstens teilweise in Längsrichtung und in Umfangsrichtung der Aussenkontur des Kolbens.In order to achieve better tilting stability of the scraper edge with respect to the central engagement part, the free end of the projections is preferably T-shaped. The T-shaped configuration extends at least partially in the longitudinal direction and in the circumferential direction of the outer contour of the piston.

Vorteilhafterweise sind miteinander zusammenwirkende Mittel von Führungen am zentralen Angriffsteil gebildet. Damit die Abstreifkante gegenüber dem zentralen Angriffsteil axial versetzt werden kann, ist die Aussenkontur des zentralen Angriffsteils derart ausgebildet sein, dass eine Führung für die Abstreifkante entsteht. Zu diesem Zweck ist die Aussenkontur des zentralen Angriffsteils beispielsweise zylindrisch ausgebildet und weist jeweils in beiden Endbereichen einen Anschlag auf, der die axiale Verschiebbarkeit der Abstreifkante begrenzt.Interacting means of guides are advantageously formed on the central engagement part. So that the scraper edge can be axially offset with respect to the central engagement part, the outer contour of the central engagement part is designed such that a guide for the scraper edge is created. For this purpose, the outer contour of the central engagement part is cylindrical, for example, and has a stop in each of the two end regions, which limits the axial displacement of the scraper edge.

Damit die Abstreifkante des Kolbens gegenüber dem zentralen Angriffsteil in Umfangsrichtung drehfest anordbar ist, sind die Führungen vorzugsweise von zur Aussenkontur des zentralen Angriffsteils hin offenen, in Längsrichtung des zentralen Angriffsteils verlaufenden Schlitzen gebildet, die mit ensprechend ausgestalteten Vorsprüngen der Abstreifkante zusammenwirken. Diese Vorsprünge sind zumindest so lange ausgebildet, dass sie die Aussenkontur des zentralen Angriffsteils in radialer Richtung nach innen überragen oder durch die Schlitze ins Innere des zentralen Angriffsteils hineinragen. Jene Vorsprünge, die in das Innere des zentralen Angriffsteils hineinragen, können ebenfalls T-förmig ausgebildet sein. Diese T-förmige Ausbildung dient ebenfalls dazu, eine bessere Kippstabilität der Abstreifkante gegenüber dem zentralen Angriffsteil zu gewährleisten. Das T-förmige Ende der Vorsprünge stützt sich dabei an einer in Längsrichtung des Kolbens verlaufenden Führungsfläche des Kolbens in radialer Richtung ab.So that the wiper edge of the piston can be arranged in a rotationally fixed manner in relation to the central engagement part, the guides are preferably formed by slots which are open to the outer contour of the central engagement part and extend in the longitudinal direction of the central engagement part and which interact with correspondingly designed projections of the wiping edge. These projections are designed at least so long that they protrude beyond the outer contour of the central engagement part in the radial direction or protrude through the slots into the interior of the central engagement part. Those protrusions that protrude into the interior of the central engagement part can also be T-shaped. This T-shaped design also serves to ensure better tilting stability of the scraper edge compared to the central part of the attack. The T-shaped end of the projections is supported in the radial direction on a guide surface of the piston running in the longitudinal direction of the piston.

Aufgrund der verschiebbaren Abstreifkante ist die Grösse der Stauräume veränderbar. Je grösser die axiale Versetzbarkeit der Abstreifkante gegenüber dem zentralen Angriffsteil ist, umso grösser ist der jeweilige Stauraum für einen Teil des ausgepressten, zusammengefalteten Folienbeutels. Um möglichst grosse Stauräume und eine kurze Baulänge des Kolbens erreichen zu können, erstrecken sich die der Führung der Abstreifkante dienenden Schlitze zweckmässigerweise über 70% bis 90% der Gesamtlänge des zentralen Angriffsteils.Due to the sliding scraper edge, the size of the storage spaces can be changed. The greater the axial displaceability of the scraper edge relative to the central engagement part, the greater the storage space for a part of the pressed-out, folded-up foil pouch. In order to be able to achieve the largest possible storage spaces and a short overall length of the piston, the slots serving to guide the scraper edge expediently extend over 70% to 90% of the total length of the central engagement part.

Die Erfindung wird anhand von Zeichnungen, die ein Ausführungsbeispiel wiedergeben, näher erläutert. Es zeigen:

Fig. 1
ein schematisch dargestelltes Auspressgerät mit einem erfindungsgemässen Kolben;
Fig. 2
eine vergrösserte Darstellung des Kolbens in Verbindung mit einem Kassettenteil, einem Folienbeutel und einer Kolbenstange mit Druckstück;
Fig. 3
den Kolben gemäss Fig. 2 in druckbeaufschlagter Stellung.
The invention is explained in more detail with reference to drawings which show an exemplary embodiment. Show it:
Fig. 1
a schematically shown squeezer with a piston according to the invention;
Fig. 2
an enlarged view of the piston in connection with a cassette part, a foil bag and a piston rod with pressure piece;
Fig. 3
2 in the pressurized position.

Das in Fig. 1 dargestellte Auspressgerät besteht aus einem zentralen, zylindrisch ausgebildeten Gehäuse 1, an das sich in Auspressrichtung eine Auspressdüse 2 in Verbindung mit einem Verschlusselement 3 anschliesst. In dem zylindrisch ausgebildeten Gehäuse 1 befindet sich ein ebenfalls zylindrisch ausgebildetes Kassettenteil 4, das einen Folienbeutel 5 und den erfindungsgemässen Kolben 6 aufnimmt.The pressing device shown in FIG. 1 consists of a central, cylindrical housing 1, to which a pressing nozzle 2 is connected in the pressing direction in connection with a closure element 3. In the cylindrical housing 1 there is a likewise cylindrical cassette part 4, which receives a foil bag 5 and the piston 6 according to the invention.

Im rückwärtigen, der Auspressrichtung gegenüberliegenden Bereich des Auspressgerätes ist der gesamte Vorschubmechanismus 7 für eine Kolbenstange 8 angeordnet. Am auspressrichtungsseitigen Ende der Kolbenstange 8 ist ein Druckstück 9 angeordnet, welches mit dem zentralen Angriffsteil 14 des Kolbens 6 in Verbindung bringbar ist. Im rückwärtigen Bereich des Gehäuses 1 ist weiters ein Griffteil 10 angeordnet, an dem um eine Achse in Richtung des Griffteils 10 schwenkbar ein Abzughebel 11 befestigt ist. Bei der Betätigung des Abzughebels 11 wird mit Hilfe des Vorschubmechanismus 7 die Kolbenstange 8 in Auspressrichtung versetzt. Bei Erreichen der Endlage der Kolbenstange 8, bzw nach dem Auspressvorgang kann mit Hilfe eines Entriegelungsarmes 12 die Verbindung zwischen Vorschubmechanismus 7 und Kolbenstange 8 unterbrochen werden, so dass ein freies, axiales Zurückziehen der Kolbenstange 8 möglich ist.The entire feed mechanism 7 for a piston rod 8 is arranged in the rear area of the pressing device opposite the pressing direction. At the end of the piston rod 8 on the pressing-out direction, a pressure piece 9 is arranged, which can be connected to the central engagement part 14 of the piston 6. In the rear area of the housing 1 there is also a handle part 10, to which a trigger lever 11 is fastened so as to be pivotable about an axis in the direction of the handle part 10. When the trigger lever 11 is actuated, the piston rod 8 is displaced in the squeezing direction with the aid of the feed mechanism 7. When the end position of the piston rod 8 has been reached or after the pressing-out process, the connection between the feed mechanism 7 and the piston rod 8 can be interrupted with the aid of an unlocking arm 12, so that the piston rod 8 can be pulled back freely, axially.

Die Fig. 2 zeigt eine vergrösserte Darstellung des Kassettenteils 4, in der sich ein mit Masse 13 gefüllter Folienbeutel 5 und der erfindungsgemässe Kolben 6 befindet. Die teilweise dargestellte Kolbenstange 8 in Verbindung mit dem Druckstück 9 ist ebenfalls dargestellt. Der Kolben 6 ist in seiner Ausgangslage vor Beginn des Auspressvorganges dargestellt. Der Kolben 6 besteht aus zwei Hälften 16, 17, die mittels einer Schnappverbindung zusammengehalten werden. Die Schnappverbindung besteht aus einem krallenartigen Arm 18, der von einer Hälfte 16 des Kolbens 6 in Längsrichtung des Kolbens 6 abragt und in eine entsprechende Ausnehmung 19 der zweiten Hälfte 17 des Kolbens 6 hintergreift. Eine entsprechende Einlaufschräge 20 an dem krallenartigen Arm 18 sorgt dafür, dass beim Zusammenfügen beider Hälften 16, 17 ein radiales Versetzen des krallenartigen Armes 18 möglich ist, bevor dieser die entsprechende Ausnehmung 19 hintergreifen kann.2 shows an enlarged view of the cassette part 4, in which there is a film bag 5 filled with mass 13 and the piston 6 according to the invention. The partially shown piston rod 8 in connection with the pressure piece 9 is also shown. The piston 6 is shown in its starting position before the start of the squeezing process. The piston 6 consists of two halves 16, 17 which are held together by means of a snap connection. The snap connection consists of a claw-like arm 18 which projects from one half 16 of the piston 6 in the longitudinal direction of the piston 6 and engages behind a corresponding recess 19 in the second half 17 of the piston 6. A corresponding entry slope 20 on the claw-like arm 18 ensures that when the two halves 16, 17 are joined together, a radial displacement of the claw-like arm 18 is possible before the latter can reach behind the corresponding recess 19.

Der Kolben 6 weist mehrere, im wesentlich gleichmässige, am Umfang verteilt angeordnete Schlitze 21 auf, die in Längsrichtung des Kolbens 6 verlaufen. Die Schlitze 21 sind geschlossen ausgebildet, so dass die in Längsrichtung liegenden Enden der Schlitze 21 als Anschläge für Vorsprünge 22 der axial versetzbaren Abstreifkante 15 dienen. Die Schlitze 21 sind als radial verlaufende Durchtrittsöffnungen im umfangsseitigen Bereich des zentralen Angriffsteils 14 ausgebildet. Die in Umfangsrichtung verlaufende Breite B der Schlitze 21 entspricht im wesentlichen der in Umfangsrichtung gemessenen Stärke der Vorsprünge 22 der Abstreifkante 15.The piston 6 has a plurality of substantially uniform slots 21 which are distributed around the circumference and extend in the longitudinal direction of the piston 6. The slots 21 are formed closed, so that the longitudinal ends of the slots 21 serve as stops for projections 22 of the axially displaceable scraper edge 15. The slots 21 are designed as radially extending through openings in the peripheral region of the central engagement part 14. The circumferential width B of the slots 21 essentially corresponds to the circumferential thickness of the projections 22 of the scraper edge 15.

Die Abstreifkante 15 überragt das zentrale Angriffsteil 14 in radialer Richtung und umgibt das zentrale Angriffsteil 14. Die radiale Abstützung und die axiale Führung der Abstreifkante 15 gegenüber dem zentralen Angriffsteil 14 erfolgt über die Vorsprünge 22, die vom Dichtbereich 28 der Abstreifkante 15 in radialer Richtung, zum Zentrum weisend, abragen. Die Vorsprünge 22 bestehen aus einzelnen Speichen, deren freies Ende T-förmig ausgebildet ist. Die T-förmige Ausbildung der Vorsprünge 22 stützt sich im Innern des zentralen Angriffsteils 14 an einer entsprechenden Führungsfläche 23 radial ab, so dass die Abstreifkante 15 gegenüber dem zentralen Angriffsteil 14 eine bessere Kippstabilität erreicht. Da die Vorsprünge 22 durch die radial verlaufenden Schlitze 21 des zentralen Angriffsteils in das Innere des zentralen Angriffsteils 14 hineinragen, wird eine Verdrehung der Abstreifkante 15 gegenüber dem zentralen Angriffsteil in Umfangsrichtung verhindert. Die Schlitze 21 bilden Führungen, in denen die Vorsprünge 22 nur axial verschiebbar sind.The wiping edge 15 projects beyond the central engagement part 14 in the radial direction and surrounds the central engagement part 14. The radial support and the axial guidance of the wiping edge 15 with respect to the central engagement part 14 takes place via the projections 22 which extend from the sealing region 28 of the wiping edge 15 in the radial direction. Pointing towards the center. The projections 22 consist of individual spokes, the free end of which is T-shaped. The T-shaped design of the projections 22 is supported radially in the interior of the central engagement part 14 on a corresponding guide surface 23, so that the wiping edge 15 achieves better tilting stability compared to the central engagement part 14. Since the projections 22 protrude through the radially extending slots 21 of the central engagement part into the interior of the central engagement part 14, rotation of the scraper edge 15 with respect to the central engagement part in the circumferential direction is prevented. The slots 21 form guides in which the projections 22 are only axially displaceable.

Das zentrale Angriffsteil 14 des Kolbens 6 besitzt eine zentrale Durchgangsbohrung 24, die der Aufnahme eines Verschlusselementes 25 des Folienbeutels 5 dient. Der Durchmesser der Durchgangsbohrung 24 erweitert sich jeweils zu den freien Enden im stirnseitigen Bereich des zentralen Angriffsteils 14 hin. Der kleinste Durchmesser der Durchgangsbohrung 24 ist in der Mitte des zentralen Angriffsteils 14 zu finden, wo beide Hälften 16, 17 des Kolbens 6 aufeinandertreffen.The central engagement part 14 of the piston 6 has a central through bore 24, which serves to receive a closure element 25 of the foil bag 5. The diameter of the through hole 24 widens towards the free ends in the end region of the central engagement part 14. The smallest diameter of the through bore 24 can be found in the middle of the central engagement part 14, where both halves 16, 17 of the piston 6 meet.

Das auf der Kolbenstange 8 angeordnete Druckstück 9 dient der Mitnahme des Kolbens 6 beim axialen Versetzen der Kolbenstange 8. Das Druckstück 9 besitzt einen in Auspressrichtung von einer Druckfläche 26 in Auspressrichtung abragenden Vorsprung 27, der im wesentlichen auf die Kontur der Durchgangsbohrung 24 im stirnseitigen Bereich des zentralen Angriffsteils 14 abgestimmt ist. Ein im Umfangsbereich des zentralen Angriffsteils 14 ausgebildeter Stauraum 29 ist zur Kolbenstange 8 hin offen.The pressure piece 9 arranged on the piston rod 8 serves to entrain the piston 6 when the piston rod 8 is axially displaced. The pressure piece 9 has a projection 27 protruding in the pressing-out direction from a pressure surface 26 in the pressing-out direction, which projection essentially corresponds to the contour of the through bore 24 in the end region of central attack part 14 is coordinated. A storage space 29 formed in the peripheral region of the central engagement part 14 is open towards the piston rod 8.

Der Auspressvorgang, bei dem Masse 13 aus dem Folienbeutel 5 mit Hilfe des erfindungsgemässen Kolbens 6 und der Kolbenstange 8 mit Druckstück 9 ausgepresst wird, ist in der Fig. 3 dargestellt. Die Dichtfläche 28 der Abstreifkante 15 liegt an der Innenwandung des Kassettenteils 4 an. Aufgrund der Reibung zwischen dem Dichtbereich 28 der Abstreifkante 15 und der Innenwandung des Kassettenteils 4 behält die Abstreifkante 15 ihre Lage während dem axialen Versetzen des zentralen Angriffsteils 14 so lange bei, bis die Vorsprünge 22 der Abstreifkante 15 an einem Ende der als Führungen ausgebildeten, radial verlaufenden Schlitze 21 des zentralen Angriffsteils 14 zur Anlage gelangen. Beim weiteren Versetzen des zentralen Angriffsteils 14 erfolgt eine Mitnahme der Abstreifkante 15 in Auspressrichtung. Durch das Versetzen der Abstreifkante 15 gegenüber dem zentralen Angriffsteil 14 entsteht ein Stauraum 29 im auspressrichtungsseitigen Bereich des Kolbens 6. Dieser Stauraum 29 dient der Aufnahme eines Teiles des ausgepressten, zusammengefalteten Folienbeutels 5.The pressing-out process, in which the mass 13 is pressed out of the film bag 5 with the aid of the piston 6 according to the invention and the piston rod 8 with the pressure piece 9, is shown in FIG. 3. The sealing surface 28 of the scraper edge 15 bears on the inner wall of the cassette part 4. Due to the friction between the sealing area 28 of the scraper edge 15 and the inner wall of the cassette part 4, the scraper edge 15 maintains its position during the axial displacement of the central engagement part 14 until the projections 22 of the scraper edge 15 at one end of the radially formed as guides extending slots 21 of the central attack part 14 come to the plant. When the central engagement part 14 is moved further, the stripping edge 15 is carried along in the pressing direction. By displacing the scraper edge 15 with respect to the central engagement part 14, a storage space 29 is created in the region of the piston 6 on the pressing-out direction. This storage space 29 serves to accommodate a part of the pressed-out, folded-up foil bag 5.

Der in Fig. 2 dargestellte, von der Druckfläche 26 des Druckstückes 9 in Auspressrichtung abragende Vorsprung 27 ragt in die zentrale Durchgangsbohrung 24 des zentralen Angriffsteils 14, so dass eine Zentrierung zwischen dem zentralen Angriffsteil 14 und dem Druckstück 9 erfolgt. Während des Auspressvorganges wird auf diese Weise ein Schrägstellen des Kolbens 6 in dem Kassettenteil 4 verhindert.The projection 27 shown in FIG. 2, projecting from the pressure surface 26 of the pressure piece 9 in the pressing direction, projects into the central through bore 24 of the central engagement part 14, so that centering takes place between the central engagement part 14 and the pressure piece 9. In this way, an inclination of the piston 6 in the cassette part 4 is prevented during the pressing-out process.

Claims (7)

Kolben für ein Auspressgerät zum Auspressen von in Folienbeuteln (5) befindlichen Massen (13) mit einem zentralen Angriffsteil (14) für eine Kolbenstange (8) und eine das Angriffsteil (14) radial überragende, das Angriffsteil (14) wenigstens teilweise umgebende Abstreifkante (15), dadurch gekennzeichnet, dass die Abstreifkante (15) gegenüber dem zentralen Angriffsteil (14) axial begrenzt versetzbar ist.Piston for a pressing device for pressing masses (13) located in foil bags (5) with a central engagement part (14) for a piston rod (8) and a wiping edge radially projecting beyond the engagement part (14) and at least partially surrounding the engagement part (14) 15), characterized in that the scraper edge (15) is axially limited displaceable relative to the central engagement part (14). Kolben nach Anspruch 1, dadurch gekennzeichnet, dass das zentrale Angriffsteil (14) und die Abstreifkante (15) zur begrenzten, axialen Versetzbarkeit miteinander zusammenwirkende Mittel aufweisen.Piston according to claim 1, characterized in that the central engagement part (14) and the scraper edge (15) have mutually interacting means for limited axial displaceability. Kolben nach Anspruch 2, dadurch gekennzeichnet, dass miteinander zusammenwirkende Mittel von in Richtung Zentrum weisenden Vorsprüngen (22) der Abstreifkante (15) gebildet sind.Piston according to claim 2, characterized in that interacting means are formed by projections (22) of the scraper edge (15) pointing towards the center. Kolben nach Anspruch 3, dadurch gekennzeichnet, dass das freie Ende der Vorsprünge (22) im wesentlichen T-förmig ausgebildet ist.Piston according to claim 3, characterized in that the free end of the projections (22) is substantially T-shaped. Kolben nach Anspruch 2, dadurch gekennzeichent, dass miteinander zusammenwirkende Mittel von Führungen am zentralen Angriffsteil (14) gebildet sind.Piston according to claim 2, characterized in that interacting means are formed by guides on the central engagement part (14). Kolben nach Anspruch 5, dadurch gekennzeichnet, dass die Führungen von zur Aussenkontur des zentralen Angriffsteils (14) hin offenen, in Längsrichtung des zentralen Angriffsteils (14) verlaufenden Schlitzen (21) gebildet sind.Piston according to claim 5, characterized in that the guides are formed by slots (21) which are open towards the outer contour of the central engagement part (14) and extend in the longitudinal direction of the central engagement part (14). Kolben nach Anspruch 6, dadurch gekennzeichnet, dass sich die Schlitze (21) über 70% bis 90% der Gesamtlänge des zentralen Angriffsteils (14) erstrecken.Piston according to claim 6, characterized in that the slots (21) extend over 70% to 90% of the total length of the central engagement part (14).
EP93810758A 1993-04-10 1993-10-29 Piston for extrusion system Expired - Lifetime EP0620047B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4311876 1993-04-10
DE4311876A DE4311876A1 (en) 1993-04-10 1993-04-10 Pistons for dispensing devices

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EP0620047A1 true EP0620047A1 (en) 1994-10-19
EP0620047B1 EP0620047B1 (en) 1996-05-22

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US (1) US5449096A (en)
EP (1) EP0620047B1 (en)
JP (1) JP3506760B2 (en)
KR (1) KR100287303B1 (en)
AT (1) ATE138292T1 (en)
DE (2) DE4311876A1 (en)
ES (1) ES2086918T3 (en)

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EP0620047B1 (en) 1996-05-22
KR100287303B1 (en) 2001-04-16
ES2086918T3 (en) 1996-07-01
DE59302694D1 (en) 1996-06-27
JPH06304513A (en) 1994-11-01
JP3506760B2 (en) 2004-03-15
DE4311876A1 (en) 1994-10-13
US5449096A (en) 1995-09-12
ATE138292T1 (en) 1996-06-15

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