EP1667920B1 - Piston d'alimentation - Google Patents

Piston d'alimentation Download PDF

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Publication number
EP1667920B1
EP1667920B1 EP04765630A EP04765630A EP1667920B1 EP 1667920 B1 EP1667920 B1 EP 1667920B1 EP 04765630 A EP04765630 A EP 04765630A EP 04765630 A EP04765630 A EP 04765630A EP 1667920 B1 EP1667920 B1 EP 1667920B1
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EP
European Patent Office
Prior art keywords
retaining
piston
follower piston
retaining element
segments
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.)
Active
Application number
EP04765630A
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German (de)
English (en)
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EP1667920A1 (fr
Inventor
Peter Wilnauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilden AG
Original Assignee
Wilden AG
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Publication date
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Publication of EP1667920A1 publication Critical patent/EP1667920A1/fr
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Publication of EP1667920B1 publication Critical patent/EP1667920B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/02—Membranes or pistons acting on the contents inside the container, e.g. follower pistons
    • B05B11/028—Pistons separating the content remaining in the container from the atmospheric air to compensate underpressure inside the container

Definitions

  • the present invention relates to a follower piston for a slightly tapered container of a disposable dispenser with a piston member and a holding member which inhibits the movement of the follower piston against the conveying direction.
  • the follower piston is primarily used in a slightly tapered container of a disposable dispenser for dispensing pasty masses, e.g. for body care.
  • the disposable dispenser carries at its upper end to the container slidable head piece, which has a communicable with the container output channel for the pasty mass.
  • the follower piston is displaced in the direction of the head piece when the conveyor provided in the head piece, designed as a hand-operated pump, generates a negative pressure in the container.
  • the follower piston known from the prior art consists of a piston element produced by means of plastic injection molding, a holding plate and a holding element, which is formed as a star-shaped stamped part with a central circular opening and a plurality of circumferentially distributed holding arms.
  • the retaining plate is connected to the piston element, wherein the star-shaped punched part is clamped between the piston element and the retaining plate.
  • the retaining plate has a central fastening pin which penetrates the circular opening of the star-shaped stamped part and over which the retaining plate is longitudinally displaceably connected to the piston element.
  • the follower piston is introduced into the container filled with pasty mass and advanced to the pasty mass in the conveying direction.
  • a vent channel through which air has escaped from the container during assembly, is closed by longitudinal displacement of the retaining plate against the piston element.
  • the metallic support arms are erected and biased against the inner peripheral surface of the container. The sharp ends of the support arms, which are bent at the ends in the opposite direction to the conveying direction, cling firmly in the inner peripheral surface of the container and thereby inhibit the movement of the follower piston against the conveying direction.
  • the present invention is based on the problem, the generic follower piston in such a way that the follower piston is cheaper and easier to manufacture.
  • the follower piston according to the invention is completely made of plastic, so that on the other hand, the same production method is used for the production of the holding element on the one hand and the piston element.
  • Metallic production processes are, in contrast to the prior art, not required for the production of the follower piston according to the invention. Consequently, the production cost for the follower piston according to the invention is reduced and a more cost-effective production is possible.
  • the holding element of the follower piston according to the invention takes over the functions of the known from the prior art metallic support member and the holding plate. Accordingly, the follower piston according to the invention has at least one component less than the previously known follower piston and thereby simplifies the assembly of the components significantly in a follower piston composed of piston element and retaining element.
  • the piston element and the retaining element of the follower piston according to the invention can also be designed as a one-piece Part to be made.
  • the retaining element has a plurality of groups of retaining segments, wherein the retaining segments of a group are distributed substantially in the circumferential direction of the retaining element and their end points have the same distance to the center.
  • the retaining segments are preferably distributed alternately in the circumferential direction and lie in a plane extending at right angles to the conveying direction, so that the retaining element is substantially designed as a plate-shaped compact component.
  • the retaining element has a plurality of groups of retaining segments.
  • the retaining segments on the inner peripheral surface of the container which have the greatest distance, first rest against the movement of the follower piston against the conveying direction.
  • the further the trailing piston is moved in the conveying direction the more these retaining segments are bent due to the taper of the container against the conveying direction.
  • the group of holding segments with the next greatest distance inhibits the movement of the follower piston against the conveying direction.
  • the holding segments of this second group are also bent in the conveying direction until the holding segments of the next group come to rest on the inner peripheral surface of the container and these inhibit the movement of the follower piston against the conveying direction.
  • all holding segments have a peripheral portion surface having the end point, and the peripheral portion surfaces are formed with the same radius.
  • the peripheral portion surfaces are those surfaces that can be applied against the inner peripheral surface of the container.
  • the radius is the distance between the starting point of the radius and the end point of the respective contact surface.
  • the starting point of the radii of a group of holding segments lies on a circle arranged concentrically to the center of the holding element, wherein the different groups of holding segments have different starting points for the radii.
  • the radii of the group with the smallest distance can have their starting points in the center.
  • the holding element has a central fastening pin, via which the holding element is guided longitudinally displaceable with the piston element.
  • This embodiment allows a longitudinal displacement between the holding element and the piston element and thus the release of a vent passage during assembly of the follower piston according to the invention.
  • the fastening pin By the fastening pin, the sliding movement of the holding element is guided relative to the piston element.
  • the fastening pin can reduce the flow cross-section of a vent passage to a level that allows the escape of air at normal pressure differences, but prevents passage of the same through the vent passage due to the high viscosity of the pasty mass.
  • a vent passage released in a second position in which the holding element is shifted from the first position in the direction of the piston element is closed.
  • air can escape from the container through this vent passage.
  • the fastening pin is formed with star-shaped cross-section and has at its foot on a sealing collar which is sealingly engageable in the second position to a projecting from the mounting pin in the first position retaining opening.
  • the leading the sliding movement mounting pin thus seals with its sealing collar from the vent passage and thereby prevents the pasty mass from leaking out of the container.
  • the holding element has a sealing cylinder and the piston element has a skirt surrounding the sealing cylinder circumferentially, which cooperating with the sealing cylinder and this has locking in the first position locking projections.
  • an annular stop is provided on the inner circumferential surface of the jacket section and a retaining ring cooperating with the stop in the first position is provided on the outer peripheral surface of the sealing cylinder.
  • a circumferential ramp is formed on the sealing cylinder, which is spread in a direction of the piston member in the direction of the piston member from the first to the second position of the skirt portion to space the stop radially from the retaining ring ,
  • the sealing cylinder Functional surfaces with which the holding element can be held for mounting by a handle. These functional surfaces facilitate the mounting of the retaining element with the piston element and the introduction of the follower piston in the container.
  • the functional surfaces are formed by ring segments which are distributed on the inner circumference of the sealing cylinder and arranged at a distance from each other, so that between a introduced in the sealing cylinder mounting mandrel and the follower piston, a rotationally fixed connection can be created.
  • the holding element is produced by means of plastic injection molding and the piston element facing edge of the peripheral portion surface lies in the parting plane of an injection mold.
  • Figures 1 and 2 show a plan view and a sectional view of an embodiment of the follower piston according to the invention with a piston element 2 and a holding element 4.
  • the follower piston is inserted into a slightly tapered container 6 of a donor, not shown.
  • a pasty mass not shown, facing front sealing lips 8a and rear sealing lips 8b of the piston element 2 are on the inner wall of the container 6 at.
  • the piston element 2 is designed as an injection molded component.
  • the end face of the piston element 2 which can be applied to the pasty mass, rises from the outside inwards and merges in the middle region into a venting passage 10 extending essentially in the axial direction.
  • the vent passage 10 Approximately in the axial height between the front sealing lip 8a and the rear sealing lip 8b, the vent passage 10 has a radially inwardly extending holding web 12 with a central holding opening 14.
  • a jacket portion 14 is formed on the pasty mass facing away from the vent passage 10.
  • the vent passage 10, the holding opening 14 and the shell portion 16 are arranged concentrically to the central longitudinal axis of the container 6.
  • the jacket section 16 is designed as a cylindrical area which is substantially circumferentially perforated by axial slots and has circumferential latching projections 18 on its inner peripheral surface at its front-side ends. Between the latching projections 18 and the holding web 12 is also a circular circumferential Ansch lay 20 on the inner peripheral surface of the shell portion 16 is provided.
  • the end face of the piston element 2 facing the pasty mass has a plurality of slots 22 extending in the radial direction, which penetrate the dome-shaped end face of the piston element 2.
  • the bottom of the slots 22 is at the level of an annular channel 24 formed between the dome-shaped end face and the front sealing lip 8a.
  • the holding element 4 is likewise designed as an injection-molded component and formed essentially in the form of a plate-shaped disk, in the center of which rises a sealing cylinder 26, on which a fastening pin 28 reduced in diameter relative to the sealing cylinder rests (see FIG.
  • the attachment pin 28 has a star-shaped cross section, i. has a plurality of extending in the axial direction vent grooves. At the foot of the fastening pin 28, this has a closed cylindrical shape, through which a sealing collar 29 is formed. As can be seen from the plan view of the retaining element according to FIG. 5, this has a plurality of retaining segments 30 arranged distributed in the circumferential direction, which are formed as sectors and are separated from one another by radial slots 32 extending in the radial direction.
  • the radial slots 32 extend from the outer peripheral surface of the holding element 4 in the direction of the center 34 of the holding element 4 and have a length corresponding to approximately half the radius of the holding element. Between the inner end of the radial slots 32 and the outer peripheral surface of the sealing cylinder 26 remains an annular base portion 33rd
  • the holding element 4 has three groups a, b, c of holding segments 30.
  • the holding segments 30 of a group a; b; c each have identical distances between the center 34 and an end point of the respective holding segments 30.
  • the end point is that point of the retaining segments which lies on the outer peripheral surface of the retaining segment 30, which cooperates with the inner peripheral surface of the container 6 and has the greatest distance from the center 34.
  • the retaining segments 30 may have multiple endpoints. In the design principle realized in this embodiment, however, the holding segments 30 of the first group a and second group b have only a single end point, which will be explained in more detail below.
  • peripheral surfaces of the individual retaining segments 30 each form peripheral portion surfaces 36 with a radius. All peripheral portion surfaces 36 of all groups a, b, c each have an identical radius.
  • the radius for the holding segments 30b with the next smaller distance to the center lies on a second circular path around the center 34 and between this and the first circular path.
  • the holding segments 30 of a group a; b; c are each distributed on the circumference of the holding element 4.
  • the retaining segments 30 are alternately in the order a, b, c; a, b, c provided.
  • the retaining segments 30 for each group a, b, c of the retaining segments 30 four peripheral portion surfaces 36, which are each arranged um.90 ° offset from one another.
  • the peripheral portion surfaces 36 of the group of retaining segments 30c with the smallest spacing are on the associated envelope , The radius of this envelope corresponds to the radius of all peripheral portion surfaces 36.
  • the sealing cylinder 26 at its front, the mounting pin 28 end facing a circumferential retaining ring 38 and at the transition to the circular base portion 33 in diameter relative to the mounting pin enlarged base 40 which has a Ramp 42 merges into the outer surface of the sealing cylinder.
  • two ring segments 44 are arranged on the inner peripheral surface of the sealing cylinder 26, which are arranged in the circumferential direction at a distance from each other and which form functional surfaces for the assembly of the follower piston.
  • An assembly mandrel not shown here, cooperates with these functional surfaces, which is connected to a handle, for example a robot, and is inserted into the sealing cylinder 26 for installation.
  • the retaining element 4 thus held is removed from the injection mold and initially connected to the piston element 2.
  • the fastening pin 28 is inserted into the holding opening 14.
  • the retaining ring 38 of the sealing cylinder 26 spreads the surrounding shell portion 16 against the advancing movement of the holding element 4 in the piston member 2, the front end face of the retaining ring 38 against the stopper 20 abuts.
  • the holding element 4 and the piston element 2 are thereby captively connected to each other, that the spring-back locking projections 18 engage behind the back of the retaining ring 38.
  • pasty mass is discharged at the upper end of the container by a conveying device, not shown here, in that a pump piston compresses the paste-like mass received in the container, which is dispensed by the conveyor due to the resulting pressure.
  • a pump piston compresses the paste-like mass received in the container, which is dispensed by the conveyor due to the resulting pressure.
  • this takes the liquid column of the pasty mass with, which also follows the follower piston in the direction of the pumping device due to the given incompressibility of the pasty mass and the sealing of the vent passage.
  • the holding element 4 inhibits in this use of the disposable dispenser movement of the follower piston against the conveying direction.
  • the peripheral portion surfaces 36a at the greatest distance first cooperate with the inner circumferential surface of the container 6.
  • the retaining segments 30a assigned to the circumferential section surfaces 36a are in this case bent by approximately 7 ° to 10 ° relative to the conveying direction with respect to a plane extending at right angles to the central longitudinal axis of the container 6.
  • the piston element 2 facing edges 46 of the peripheral portion surfaces 36a are pressed with relatively high surface pressure against the inner peripheral surface of the container 6 and thus secure the follower piston against undesired movement thereof opposite to the conveying direction.
  • edges 46 desired for this purpose can be increased by designing the injection molding tool to produce the retaining element in such a way that the edges 46 of the circumferential section surfaces 36 lie in the parting plane of the tool. Due to the angular position of the holding segments 30, these are bent in the desired trailing movement of the trailing piston counter to the conveying direction and thus allow the necessary trailing of the trailing piston in the conveying direction.
  • the follower piston moves in the direction of the pumping device slightly tapered in the injection molding for technical reasons.
  • the holding segments 30a of the first group a are thereby increasingly arcuate until finally reach the holding segments 30b of the next group b to bear against the inner peripheral surface of the container 6 and finally progressing movement in the conveying direction take over the function of the first group a of the retaining segments 30a, due to increasing bend to lose effect.

Landscapes

  • Coating Apparatus (AREA)
  • Reciprocating Pumps (AREA)
  • Compressor (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)

Claims (12)

  1. Piston d'alimentation destiné à un distributeur unidirectionnel doté d'un conteneur (6) se terminant de manière légèrement conique, d'un piston (2) et d'un élément de retenue (4), qui empêche le piston d'alimentation de se déplacer dans le sens inverse d'une direction de transport, l'élément de retenue (4) étant réalisé en plastique et présentant différents segments de retenue (30), dont les surfaces d'appui (36) peuvent s'appliquer partiellement contre la surface périphérique interne du conteneur (6), caractérisé en ce que les segments de retenue (30) se distinguent les uns des autres en ce que les extrémités des surfaces d'appui (36) présentent des distances différentes depuis un point central (34) de l'élément de retenue (4).
  2. Piston d'alimentation selon la revendication 1, caractérisé en ce que l'élément de retenue (4) présente plusieurs groupes (a, b, c) de segments de retenue (30), les segments de retenue (30) d'un groupe (a, b, c) étant essentiellement répartis dans le sens périphérique de l'élément de retenue (4) et leurs extrémités ayant la même distance par rapport au point médian (34).
  3. Piston selon la revendication 1 ou 2, caractérisé en ce que tous les segments de retenue (30) présentent une surface de section périphérique (36) présentant une extrémité, et en ce que les surfaces de section périphérique (36) sont réalisées avec le même rayon.
  4. Piston d'alimentation selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de retenue (4) présente un tourillon de fixation médian (28), par le biais duquel l'élément de retenue (4) est guidé longitudinalement dans le piston (2).
  5. Piston d'alimentation selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un passage d'aération (10) est dégagé entre le tourillon de fixation (28) et l'élément de retenue (4) dans une première position, dans laquelle l'élément de retenue (4) est maintenu à distance par rapport au piston (2) sur celui-ci, lequel passage étant fermé dans une deuxième position, dans laquelle l'élément de retenue (4) est déplacé par rapport à la première position dans la direction du piston (2).
  6. Piston d'alimentation selon la revendication 5, caractérisé en ce que le tourillon de fixation (28) est réalisé avec une section transversale en forme d'étoile et en ce qu'il présente une collerette d'étanchéité (29) au niveau de sa base, laquelle peut être placée dans la deuxième position de manière étanche au niveau d'une ouverture de retenue (14) que traverse, dans la première position, le tourillon de fixation (28).
  7. Piston d'alimentation selon la revendication 5 ou 6, caractérisé en ce que l'élément de retenue (4) présente un cylindre d'étanchéité (26) et en ce que le piston (2) présente une enveloppe (16) entourant le cylindre d'étanchéité (26) sur sa périphérie, laquelle enveloppe comporte des saillies de crantage (18) qui co-agissent avec le cylindre d'étanchéité (26) et maintiennent ce dernier dans la première position.
  8. Piston d'alimentation selon la revendication 7, caractérisé en ce que une butée de forme annulaire (20) est prévue au niveau de la surface périphérique interne de l'enveloppe (16) et en ce qu'une bague de blocage (38)qui co-agit, dans la première position, avec la butée (20) est prévue au niveau de la surface périphérique extérieure du cylindre d'étanchéité (26).
  9. Piston d'alimentation selon la revendication 7, caractérisé en ce qu'une rampe (42) périphérique est réalisée au niveau du cylindre d'étanchéité (26), laquelle rampe est écartée lors d'un déplacement de l'élément de retenue (4) dans la direction du piston (2) de la première à la deuxième position de l'enveloppe (16), pour éloigner de manière radiale la butée (20) de la bague de blocage (38).
  10. Piston d'alimentation selon l'une quelconque des revendications précédentes, caractérisé en ce que des surfaces fonctionnelles co-agissant avec une manette servant au montage de l'élément de retenue (4) sont prévues sur la face interne du cylindre d'étanchéité (26).
  11. Piston d'alimentation selon la revendication 10, caractérisé en ce que les surfaces fonctionnelles sont réalisées par des segments annulaires (44), qui sont répartis sur la périphérie interne du cylindre d'étanchéité (26) et qui sont disposés à distance les uns des autres.
  12. Piston d'alimentation selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément de retenue (4) est fabriqué par moulage par injection de plastique et en ce que l'arête de la surface de section périphérique (36) tournée vers le piston (2) se situe dans le plan de joint d'un outil de moulage par injection.
EP04765630A 2003-09-30 2004-09-27 Piston d'alimentation Active EP1667920B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20315111U DE20315111U1 (de) 2003-09-30 2003-09-30 Nachlaufkolben
PCT/EP2004/010803 WO2005032969A1 (fr) 2003-09-30 2004-09-27 Piston d'alimentation

Publications (2)

Publication Number Publication Date
EP1667920A1 EP1667920A1 (fr) 2006-06-14
EP1667920B1 true EP1667920B1 (fr) 2007-05-23

Family

ID=34202490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04765630A Active EP1667920B1 (fr) 2003-09-30 2004-09-27 Piston d'alimentation

Country Status (4)

Country Link
EP (1) EP1667920B1 (fr)
AT (1) ATE362883T1 (fr)
DE (2) DE20315111U1 (fr)
WO (1) WO2005032969A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011102524A1 (de) 2011-05-26 2012-11-29 Krallmann Kunststoffverarbeitung Gmbh Spender

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768705A (en) * 1971-09-13 1973-10-30 Spatz Corp Dispensers for fluent masses
DE3042285A1 (de) * 1980-11-08 1982-06-09 Bramlage Gmbh, 2842 Lohne Spender fuer pastoese massen
DE3226835A1 (de) * 1982-07-17 1984-01-19 Alfred Von 4178 Kevelaer Schuckmann Spender fuer insbesondere pastoese massen
ATE71048T1 (de) * 1985-11-06 1992-01-15 Future Patents Dev Fpd Spender fuer pastoese massen.

Also Published As

Publication number Publication date
WO2005032969A1 (fr) 2005-04-14
DE502004003904D1 (de) 2007-07-05
DE20315111U1 (de) 2005-02-10
EP1667920A1 (fr) 2006-06-14
ATE362883T1 (de) 2007-06-15

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