JP2009269675A - Piston for use in cartridge and cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piston which includes both the shearing function and a sealing function, and is used for pushing liquid material out of a cartridge. <P>SOLUTION: The piston is used for pushing the liquid material out of the cartridge 15. In the style wherein the material is stored within a sheet bag, the piston 1 has an annular shearing edge 4 for peeling the sheet bag off the inside of the cartridge 15, and an annular sealing member 5 for sealing the piston 1 inside the cartridge 15. The shearing edge 4 and the sealing member 5 are joined to each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a piston of the type described in the upper conceptual part of claim 1, that is, a piston for extruding a fluid material from a cartridge, wherein the material is accommodated in a seat bag. . The present invention also provides a cartridge of the type described in the upper conceptual part of claim 9, that is, a sheet bag disposed in the cartridge and containing a fluid substance, and a piston for extruding the substance from the cartridge. The present invention relates to a cartridge of the type provided.

  Cartridges for storing and extruding flowable substances, for example pasty substances, are known in particular in the construction field. The substance can be contained in a sheet bag for filling or refilling the cartridge. The cartridge also contains two or more components, each of which is housed in its own sheet bag and extruded together. The sheet bag can be joined to the cartridge on its entire surface or a part of the surface, linearly or in the form of dots, for example by adhesion or plastic fusing. In this connection, the sheet bag (Folienbeutel) refers in particular to a blow-molded product known from DE 102004056908A1 or a thin partition wall separating a part of the inner chamber of the cartridge as known from DE 102005017599A1. means.

  A piston is slidable within the cartridge to extrude the flowable material. The piston, when it is provided or connected to the cartridge, sequentially peels or dissociates the cartridge from the cartridge, and in some cases, the outflow of the substance flowing out of the sheet bag. In order to prevent the ink from being pushed out between the piston and the cartridge, it has a function of sealing the cartridge, and a function of preventing the ingress of air and consequently the ingress of moisture.

DE102004056908A1 DE102005017599A1

  An object of the present invention is to provide a piston suitable for that purpose and a cartridge equipped with such a piston.

  In order to solve this problem, the piston according to the present invention is a piston of the type described at the beginning, in which the piston seals the piston in the cartridge with an annular shear edge for peeling the seat bag from the inside of the cartridge. An annular sealing member is provided so that the shearing edge and the sealing member are coupled to each other.

  In the cartridge according to the present invention, the piston has an annular shearing edge for peeling the sheet bag from the inside of the cartridge, and an annular sealing member for sealing the piston in the cartridge. And the seal member are connected to each other.

  The piston according to the present invention has an annular shear edge for peeling one or more sheet bags from the inside of the cartridge, in which case “annular” does not necessarily mean “completely annular”. It is not. This is because the shearing action does not necessarily have to be obtained over the entire circumference. The piston according to the present invention further includes an annular sealing member for hermetically sealing the cartridge. The shearing edge and the seal member are coupled to each other, in which case they may be coupled indirectly via another member or part. By being joined in this way, it is possible to produce the shearing edge from a particularly hard material separate from a sealing member made of a particularly rubber-elastic material. The present invention allows the selection of a suitable material for the shearing edge and, independently of that, allows the selection of other materials suitable for the sealing member. Thereby, the shearing action of the shearing edge of the piston according to the present invention and the sealing action of the sealing member can be optimized.

  In an advantageous configuration of the invention, the piston has two piston parts that are in conformity with each other, one of which has a shearing edge and the other piston part has a sealing member. Both piston portions are connected to each other to form a piston. In this case, the coupling of the two piston parts is effected, for example, by snap coupling or locking coupling. Because both pistons have the same shape, both pistons can be manufactured from different materials in succession in the same injection mold. In this case, the shearing edge has the same shape as the sealing member, and the sealing member has, for example, an annular sealing edge.

  In another configuration of the present invention, the piston has an annular seal lip as a seal member. The shape of the sealing lip is also suitable for the shape of the shearing edge if the shearing edge is made from a highly rigid material and the sealing lip is made from a highly elastic material.

  In another configuration of the invention, the piston has a snap coupling or locking coupling that couples the shearing edge and the seal member. The snap joint or locking joint can be formed without additional members, and the individual members can be joined with minimal effort to form the piston.

  Snap joints or locking joints are suitable for automated coupling and thus for mass production.

  In an advantageous configuration of the invention, the shearing edge is arranged in front of the sealing member in the direction of extrusion, so that the shearing edge is removed from the cartridge in front of the sealing member when the sheet bag is extruded. Can peel or dissociate.

  The sealing member that follows in the pushing direction works to prevent the material flowing out of the seat bag from rubbing along the piston and to prevent moisture from entering. The sheet bag can be damaged during extrusion, which can cause the material contained in the sheet bag to flow out. To this end, an advantageous configuration of the invention has a reservoir for the substance, which reservoir can be formed, for example, by a space between a piston part having a shearing edge and a piston part having a sealing member. it can. An inlet opening for the reservoir is provided between the shearing edge and the seal member. This inlet opening is for example annular. Through this inlet opening, the material that has passed through the shear edge reaches the reservoir of the piston.

  In order to allow air to escape upon entry of the piston into the cartridge, in another configuration of the invention, the piston is provided with an air vent opening which can be closed, for example by a plug.

  When the piston consists of two pistons that match each other, in an advantageous configuration of the invention, both piston parts have an air vent opening and are relatively rotatable together. In this case, in one rotational position, the air vent openings of both piston parts are in communication with each other, or in any case, one piston part does not cover the air vent opening in the other piston part. In this rotational position of both piston parts, the piston can be inserted into the cartridge, where air can escape out of the cartridge through the air vent openings of both piston parts. In other rotational positions of the piston parts, one piston part closes the air vent opening of the other piston part so that fluid material cannot escape through the air vent opening of the piston part when the cartridge is extruded. .

It is a perspective view which decomposes | disassembles and shows the piston by this invention. It is a perspective view which shows the piston shown by FIG. 1 in the integrated state. It is a longitudinal cross-sectional view which shows the piston shown by FIG.1 and FIG.2 with a cartridge. FIG. 4 is a cross-sectional view of the piston and the cartridge shown in FIG. 3 at different angles.

  Next, embodiments of the present invention will be described with reference to the drawings.

  The piston 1 according to the invention shown in FIGS. 1 and 2 has two piston parts 2, 3, both pistons 2, 3 being shown as separate members in FIG. 1 and one piston in FIG. 2. Are shown in a summarized state. Both piston parts 2, 3 have the same shape and size but are made of different plastics. On the basis of the same shape, both piston parts 2, 3 can be produced in the same injection mold, but not simultaneously.

  One piston part 2 has an annular shear edge 4 and the other piston part 3 has an annular seal lip 5 with a seal edge 6 as a sealing member. One piston part 2 with a shearing edge 4 is made of a rigid or bending-rigid plastic and the other piston part 3 with a sealing lip 5 is made of an elastic plastic suitable as a material for sealing. Yes. On the basis of the matching shape of the piston parts 2, 3, one piston part 2 has an annular lip 7 whose cross section corresponds to the cross section of the seal lip 5. The annular edge of the lip 7 forms the shearing edge 4. The lip 7 and the seal lip 5 are integrally transferred to the disk-shaped base surface 8 at the base portion. The base body 8 has a tubular receptacle 14 for a piston rod (not shown) on the side of the collar 9 in the center (FIG. 3).

  A tubular collar 9 projects from both piston portions 2 and 3 in a direction opposite to the lip 7 and the seal lip 5, and the collar 9 is divided into a plurality of segments 11 by slits 10. The seal lip 5 has a hook shape when viewed in cross section (see FIGS. 3 and 4). The lip 7 and the seal lip 5 have an annular ridge 12 projecting inwardly on the inside, and the ridge 12 cooperates with the collar 9. That is, the raised portion 12 of the seal lip 5 forms a snap coupling portion 13 together with the collar 9 of the piston portion 2 having the shearing edge 4, and the piston coupling portions 2, 3 are formed as shown in FIG. As shown in FIG. 3 and FIG. 4, they are fitted together like a snap. Since the collar 9 is divided into the plurality of segments 11 by the slits 10, the possibility of elastic deformation is enhanced, thereby enabling the snap coupling portion 13 to be fitted well.

  Basically, both the piston portions 2 and 3 can be coupled by fitting the snap coupling portion 13 in the opposite direction. However, the piston part 2 with the shearing edge 4 is arranged in front of the other piston part 3 with the sealing lip 5 in the extrusion direction. That is, the collar 9 is fitted into the raised portion 12 inside the seal lip 5, and the shearing edge 4 projects freely from the piston 1.

  As can be seen from FIGS. 3 and 4, the piston 1 having both piston parts 2, 3 connected to each other by a snap connection 13 is received in the cartridge 15. The cartridge 15 contains a fluid, for example paste-like substance, which can be pushed out by sliding of the piston 1. The cartridge 15 contains a plurality of, for example, two components, and both components are contained in the cartridge 15 separately in a sheet bag. The sheet bag, which is not illustrated in itself, contacts the inside of the wall of the cartridge 15 and is fixed inside the cartridge 15 by, for example, a linearly extending adhesive or plastic fusion seam 16 extending in the longitudinal direction of the cartridge 15. Has been. During extrusion of the material, the shearing edge 4 of the piston 1 dissociates the sheet bag from the inside of the cartridge 15. The seal lip 5 prevents the material from flowing out of the cartridge 15 along the piston 1 if, for example, one component of the material flows out of the seat bag due to damage and is rubbed by the shearing edge 4. Further, the seal lip 5 prevents the inflow of air into the cartridge 15 with the intrusion of humidity. The substance flowing out of the seat bag is guided inward by the seal lip 5 and passes through the slit 10 of the collar 9 and enters the intermediate chamber between the base surfaces 8 of the piston portions 2 and 3. The intermediate chamber between the two base surfaces 8 forms a reservoir 17 for the material that has flowed out of the seat bag and abraded by the shearing edge 4, and the slit 10 of the collar 9 provides an inlet opening for this reservoir 17. Form. The sealing lip 5 has a sealing action on the inside of the cartridge 15 on the inside of the cartridge 15, that is, on the adhesive or plastic fusion seam 16 based on its elasticity.

  Both piston parts 2 and 3 each have one air vent opening 18. The air vent opening 18 is in the form of a cylindrical hole in the embodiment shown in the drawing, is eccentric in parallel to the axis, and is disposed at a location where the radial rib 21 contacts the tubular rib 20. The two piston parts 2, 3 joined by a snap-in fit are pivotable, so that the air vent openings 18 of both piston parts 2, 3 are oriented jointly, i.e. aligned with each other. This has shifted to each other. In this rotational position of the piston parts 2, 3, the piston 1 is inserted into the cartridge 15 and air can escape from the cartridge 15 through the air vent opening 18. As a result of the relative rotation of the piston parts 2, 3, one piston part 2 closes the air vent opening 18 of the other piston part 3, as shown in FIG. For a positive seal, both piston parts 2, 3 have bulb-shaped closure plugs 19, which are shown in FIG. The closing plug 19 of one piston part 2 can be aligned with the air vent opening 18 of the other piston part 3 by relative rotation of the piston part 2. The closing plug 19 improves the sealing performance of the closed portion of the air vent opening 18. When the air vent opening 18 is closed by the relative rotation of the piston portions 2 and 3, it becomes impossible for fluid material to flow out through the air vent opening 18 in the piston 1 when the cartridge 15 is pushed out.

  1 piston, 2, 3 piston part, 4 shearing edge, 5 sealing lip, 6 sealing edge, 7 lip, 8 base surface, 9 collar, 10 slit, 11 segment, 12 raised part, 13 snap coupling part, 14 receiving part, 15 cartridge, 16 adhesive or fusion seam, 17 reservoir, 18 air vent opening, 19 closure plug, 20, 21 rib

Claims (9)

  A piston for extruding a fluid substance from the cartridge (15), wherein the substance is contained in the sheet bag, and the piston (1) peels the sheet bag from the inside of the cartridge (15). An annular shearing edge (4) for sealing and an annular sealing member (5) for sealing the piston (1) in the cartridge (15), the shearing edge (4) and the sealing member ( And 5) are coupled to each other, a piston for a cartridge.   The piston (1) has two piston parts (2, 3) that are in conformity with each other, one of which (2) has a shearing edge (4) and the other piston part ( 3. Piston according to claim 1, wherein 3) has a sealing member (5) and the piston parts (2, 3) are joined to each other.   2. Piston according to claim 1, wherein the piston (1) has an annular sealing lip as sealing member (5).   4. Piston according to claim 3, wherein the shape of the shearing edge (4) matches the shape of the sealing lip (5).   2. Piston according to claim 1, wherein the piston (1) has a snap coupling or locking coupling (13) for coupling the shearing edge (4) and the sealing member (5).   The shearing edge (4) is arranged in front of the sealing member (5) when viewed in the extrusion direction, and the piston (1) has an inlet opening (10) between the shearing edge (4) and the sealing member (5). 2. Piston according to claim 1, comprising a reservoir (17) for the substance provided.   2. Piston according to claim 1, wherein the piston (1) has a bleedable air opening (18).   Both piston parts (2, 3) are relatively rotatable, and both piston parts (2, 3) have air vent openings (18) communicating with each other at one rotational position of the piston parts (2, 3). 3. Piston according to claim 2, wherein one piston part (2) closes the air vent opening (18) of the other piston part (3) in the other rotational position.   A cartridge which is disposed in the cartridge (15) and has a sheet bag for containing a fluid substance and a piston (1) for extruding the substance from the cartridge (15). In which the piston (1) peels off the sheet bag from the inside of the cartridge (15) and the annular shearing member (4) for sealing the piston (1) in the cartridge (15) (5), and the shearing edge (4) and the seal member (5) are coupled to each other.

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