• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    cartridge piston. the present invention relates to a piston (1.51) which surrounds a piston body (2.52) which is surrounded by one side of the product (3.53), an opposite drive side (4.54) and circumferentially by a piston jacket (5.55), the piston jacket (5.55) forming a connection between the product side (3.53) and the drive side (4.54). the piston liner (5.55) is arranged around a piston shaft (9), wherein the piston liner (5.55) is joined by a fillet-shaped element (26.76) with the piston body (2.52), so that between the piston body (2.52) and the piston liner (5.55) on the product side (3.53) a groove is formed (23 .73) surrounding. on the product side (3.53) a cover element (13.63) is arranged which has a surface (29.79) on the drive side which is positioned directly on the surface on the product side (28.78) of the body of the piston (2,52).
    公开号:BR112012013661B1
    申请号:R112012013661-5
    申请日:2010-12-08
    公开日:2021-07-20
    发明作者:Manfred Obrist
    申请人:Sulzer Mixpac Ag；
    IPC主号:
    专利说明:

    Description
    [0001] The present invention relates to a piston for a cartridge, especially for the discharge of filler masses containing solid substances.
    [0002] A piston of this kind became known, for example, from document DE 200 10 417 U1. The piston has a first section that has a sealing lip. The sealing lip touches the cartridge wall.
    [0003] Another previously known piston is disclosed in European patent EP 1 165 400 B1. This piston consists of a soft synthetic material, eg a low density polyethylene (LDPE low density polyethylene) in order to achieve the necessary seal against the cartridge wall. A piston of this type can be compatible only to a limited extent with materials that form the filler mass of the cartridge. In order to prevent the piston from entering along its product side with these materials, a covering element consisting of a synthetic material that is resistant to the filler mass is used. The covering element covers a larger cross-section of the cross face on the product side with the exception of the marginal region which is contiguous with the cartridge wall. The marginal region is formed by a flank that extends outside the capping element along the outer circumference of the piston towards the product side. The flank is separated by the covering element by a v-shaped groove. In this example of execution, the flank is in contact with the filling mass and the other regions of the piston will be shielded by the covering element. For some fillers, the fact applies that the contact with the piston material results in a swelling of the piston material, thus causing a widening in the flank region. This has the advantage that the sealing effect is reinforced. Alternatively, in this regard, several sealing lips may also be arranged on the circumference of the piston, which became known, for example, from document CH 610 994.
    [0004] It is an objective of this invention, to find an improvement for the mentioned piston, so that the covering element and the piston body can be produced in a single work step.
    [0005] This task will be solved by a piston which is produced in the multi-component jet molding process, especially in an assembly jet molding process. The expression jet injection molding process comprises a jet molding process, in which, initially, an assembly step can be saved. In addition to the expression assembly injection molding process, the expression mobile injection molding process is also common. With this process, mobile components can be specially produced in a convergent direction in a single work step, such as adjustable ventilation slots in the ventilation elements or hinges.
    [0006] The piston has a product side, as well as a drive side opposite the product side, as well as a piston body and is circumferentially limited by a piston liner, where the product side covers a surface of product side, where the piston liner forms a connection between the product side and the drive side, where the piston liner is disposed around a piston axis and through a fillet element is joined with a piston body, so that between the piston body and the piston liner there is formed a surrounding groove on the product side, which surrounds the surface on the product side, where on the product side is provided a cover element having a product side surface and a drive side surface. The drive surface rests almost entirely on the surface on the product side piston body, meaning that the product side surface of the piston body and the drive side surface of the capping element touch each other, and, essentially, across the entire common surface, which is to say that there is a surface contact which extends essentially to the entire common surface.
    [0007] The covering element is injected in the multi-component injection molding process, directly on the surface of the piston body. Therefore, the product side surface of the piston body follows the contours of the cover element surface on the drive side. The product side surface of the piston body therefore constitutes a copy-shaped image of the drive side surface of the cover element.
    [0008] The piston liner may converge on the product side in a protrusion that features a piston conducting element in a cartridge. This conductive element forms a protective edge to prevent damage to the sealing lip during the production process. The sealing lip is suitable for producing a sealing contact with a cartridge wall.
    [0009] The covering element presents a surface of the product side that is arranged opposite to the surface of the drive side, where, the surface of the product side of the covering element is concave. With concave surface it should be understood in particular that a surface with a dent that is disposed on the surface on the side of the product. According to a preferred example of embodiment, this dent is a rotary symmetry recess in the shape of a segment of a sphere and which can also be formed as a polar element of an ellipsoid when the transverse face of the piston is ellipsoid. The concave surface can also be imagined to have the shape of a conical tip.
    [0010] Naturally, combinations of the aforementioned shapes are also conceivable for pistons with rotating symmetry or not rotating symmetry either.
    [0011] A protrusion can be provided on the surface of the piston body on the product side, which penetrates into a corresponding recess in the surface on the actuation side of the cover element. Alternatively, or respectively in a complementary sense, a protrusion can be provided on the product side surface of the piston body which penetrates into a corresponding recess in the surface on the operating side of the cover element so that the protrusion touches the recess throughout the entirety. the common surface.
    [0012] The protrusion can be, for example, a flute and is arranged as part of a ring around the axis of the piston. A variety of flutes can be arranged at different radial distances from the piston axis.
    [0013] The protrusions may at least partially be out of phase with each other so that a stream of air is produced around the protrusions. The protrusions form a labyrinth structure through which air from the cartridge's reserve chambers can pass through the piston. This variant is especially considered for an annular-shaped flute that serves as a sealing element.
    [0014] According to another advantageous embodiment, the covering element contains a pin or a valve which projects through the piston body towards the actuating side of the piston. This pin-shaped element and/or the valve-shaped element can be shaped as a conical plug-in pin. In addition, this pin can have rotational symmetry in relation to the piston axis. The pin and/or the valve can be moved relative to the piston body so that a connecting path can be formed between the valve and the piston body. The pin or valve element has a corresponding end that extends beyond the surface of the piston body on the drive side, so that the pin or valve can be lifted from the corresponding seat under the action of a pressure force, of Thus, for ventilation, a ventilation slot can be formed and the connecting path between the cover element and the piston body can also be formed.
    [0015] A support element in the form of a jacket may be mounted on the outer circumference of the surface on the product side. This support element in the form of a liner can project into the groove formed between the piston body and the piston liner.
    [0016] The groove has a base, and in the base of the slot a receiving element is integrated into which the edge of the supporting element in the form of a jacket protrudes.
    [0017] According to a preferred embodiment, the support element can contain at least one ventilation patch which can be joined with the ventilation slot, especially with an annular ventilation slot, as well as with the connecting path.
    [0018] The ventilation slot is formed, for example, as a slot in the jacket-shaped support element. A variety of ventilation slots can be provided. These ventilation slots can be distributed around the circumference of the jacket-shaped support element, in particular the ventilation slots can be arranged at regular distances from each other.
    [0019] A process for producing a piston according to one of the preceding embodiments comprises the steps of producing the core body in the injection molding process and subsequent application of the cap in the multi-component injection molding process on the same injection device. injection molding.
    [0020] A cartridge for discharging components contains at least one piston, preferably several pistons, the components being arranged side by side or in coaxial hollow compartments in the cartridge. In addition, the cartridge may be fitted with a discharge apparatus or the cartridge may be placed inside the discharge apparatus. By means of the discharge device the piston is movable. Discharge apparatus can be joined with the piston on the drive side.
    [0021] In an especially advantageous way, the piston, according to one of the preceding examples, can be used for discharging filler masses containing solid substance, as well as for pasty or viscous masses.
    [0022] Next, the invention will be explained based on the drawings. The figures show:
    [0023] figure 1 piston according to a first example of the invention,
    [0024] Figure 2 view from the product side of the piston body,
    [0025] figure 3 seen from the product side of the piston,
    [0026] figure 4 piston according to the second example of execution of the invention,
    [0027] figure 5 annular piston according to another example of implementation of the invention.
    [0028] Figure 1 shows a piston according to the first example of embodiment of the invention. Piston 1 encompasses the body of piston 2 usually produced in a plastic injection molding process. Piston 1 will preferably be employed to discharge a filler mass especially of fluid or pasty products from the cartridge. The filler mass may also contain solid substances. The filler mass is located in a reserve chamber of the cartridge 17, inside which the piston 1 can be moved. A wall 16 of the reserve chamber 17 is partially shown. Piston 1 slides along wall 16 and in this movement discharges the filler mass through a discharge opening not shown. The face of piston 1 facing the filler mass will then be designated as product side 3. To set piston 1 in motion and keep it in motion, a pressure force will be applied by a discharge apparatus or a fluid pressure. The discharge apparatus 10, in which a firing pin is presented, is located on the side of the piston opposite the side of the product 3. This side will hereinafter be referred to as the drive side 4.
    [0029] The piston 1 comprises the piston body 2 and a piston liner 5. The piston body 2 is limited by the drive side 4, the product side 3 as well as the piston liner 5. The piston liner 5 constitutes a connection between the product side 3 and the drive side 4, whereby the piston sleeve 5 is arranged around the axis of the piston 9. The piston sleeve 5 is joined with the piston body 2 by means of an element in the form of an annular fillet 26, so that between the piston body 2 and the piston sleeve 5 a surrounding groove 23 is formed on the product side. Furthermore, between the piston body 2 and the piston liner 5, in most cases, reinforcement ribs 15 are provided. with a cylindrical reserve chamber. In most cases the piston 1 is a plastic component, which advantageously has been produced in the injection molding process.
    [0030] In most cases, the piston body 2 has a variety of recesses or is shaped as a hollow body. For reasons of material saving, as well as in view of the difficulties resulting from the injection molding of thick-walled components, the piston body 2 as well as the piston liner 5 are already produced from diameters of a few centimeters as components of thin walls. The necessary shape stability is attributed to the piston body 2 by reinforcement ribs 15. These reinforcement ribs 15 are arranged on the drive 4 side of the piston 1. The provision of reinforcement ribs 15 ensures that the piston 1 preserves its shape also when in the discharge of the filling mass the piston 1 is exposed to pressure through a discharge apparatus.
    [0031] In addition, the piston 1 has a cover element 13 which is mounted on the piston body 2 on the product side 3. A cover element 13 of this type can advantageously be produced from a material that has greater resistance to bending relative to filler mass than the material from which the piston body is produced. In this way, the covering element 13 can perform a protective function for the piston body 2. A covering element 13 will then preferably be used when the filler material has a tendency to attack the piston material. This applies especially to pistons 1 made of softer plastic material such as LDPE. LDPE is, for example, attacked by polyester resins and swells.
    [0032] On the surface 27 of the product side of the covering element 13, on its outer circumference - according to the example of embodiment in Figure 1 - a support element 21 in the form of a jacket is mounted. The bearing element 21 in the form of a sleeve is in surface contact with the piston body 2. Thus, the covering element 13 has a surface 29 on the actuation side which abuts the surface 28 on the product side of the piston body. 2 in full form. This means that the drive-side surface 29 of the cover element 13 is in contact with the product-side surface 28 of the piston body 2 and in such a way that essentially all of the common and drive-side surface 29 rests on the product side surface 28 along the entire common contact surface. Preferably, at least 60% of the drive side surface 29 of the covering element 13 is in surface contact with the product side surface 28 of the piston body 2, especially preferably at least 75%, especially at least 90 %.
    [0033] The sleeve-shaped support element 21 projects into a groove 23 surrounding the piston body 2 on the product side 3. The groove 23 has a groove base 36, in which a groove base 36 is integrated into this groove base 36. receiving element 37, into which the edge 35 of the sleeve-shaped support element 21 penetrates. The covering element will be kept there so that the covering element 3 cannot come loose from the piston body 2. The fixing is made by the difference in contraction of the two materials. Furthermore, the receiving element 37 for the jacket-shaped support element 21 acts as a rest, so that the covering element 13, after removal of the discharge apparatus 10, can elastically return to its original position. The edge 35 of the sleeve-shaped support element 21 is essentially cylindrical in shape.
    [0034] The covering element 13 has a surface 27 on the product side that is arranged opposite the surface 29 on the drive side. The product side surface 27 of the covering element 13 has a concave curvature.
    [0035] For a piston according to the state of the art there is a higher threshold value for the movement speed. Moving speed encompasses the speed at which the piston is moved to discharge the filler mass in the cartridge. If this movement speed were further increased above this threshold value, such a high pressure would be exerted by the air on the wall 16 of the cartridge 17 that the wall 16 of the cartridge 17 would dent outwards. An extension of this kind of the transversal face of the cartridge 17 is already undesirable because the conductive element 7 can lose contact with the wall 16 of the cartridge 17. Therefore, the filler mass can reach the actuating side of the piston, passing between the element conductor 7 to wall 16. In addition, the piston 1a conduction is missing, so that the piston 1 itself could tilt or tip over. For these reasons, it has not been possible to increase the speed of movement in pistons, according to the state of the art.
    [0036] In order to increase the speed of movement, the covering element 13 can be produced of a more stable material like the piston body 2. Nevertheless, until now the union of a covering element 13 with a piston body 2 it was only possible to materialize with two existential restrictions. On the one hand, an additional assembly step will have to be provided for interconnecting the piston body 2 and the cover element 13, which elements are produced in 2 different working steps. Constrained by this additional assembly step, a joining of valve element 22 to shaft 34 can only take place when shaft 34 of valve element 22 is aligned in parallel with piston shaft 9. Only with this basic condition it becomes possible to fit the covering element 13, which contains the valve element 22, free of destruction, inside the recess corresponding to the piston body 2 and this in such a way that the sealing in relation to the filling mass outlet for the drive 4 side of the piston.
    [0037] If, however, the axis 34 of the valve element 22 has a point of intersection with the axis of the piston 9 or if it forms with the axis of the piston 9 an angle greater than 0° and less than 90°, the body of the piston 2 and cover element 13 cannot cooperate with each other and are free from destruction. Therefore, in employing the conventional injection molding process, the axis 9 of the piston body 9 and the axes of each pin element 19 or valve elements 22 need to be aligned reciprocally parallel.
    [0038] In the multiple component injection molding process it is possible to combine 2 materials of different stiffness. This combination is also possible when the piston body 2 is so aligned in the direction of the valve 22 that its axes form a reciprocal angle which is greater than 0°. If, in particular, a covering element 13 with a concave surface 27 on the product side is used, it can be mounted in the stress-free multi-component injection molding process. When the material of the covering element 13 presents a thermal expansion and differs from the material of the piston body 2, the covering element 13 - similarly to a connection by contraction - can make a stronger connection, that is to say more sealed , with the piston body 2. This means that the channels between the piston body and the cover element are sealed as long as the pin-shaped element 19 or valve-shaped element 22 is not opened. In this way, the transverse face of the air passage opening can be selected larger because the sealing function has been accepted by the covering element 13 and by the piston body 2.
    [0039] If the valve element 22 is opened, the passage of air can be increased because a larger passage opening is released, so that the air passing through the passage opening can be discharged more quickly without trying to An additional effort is required in the assembly of a piston body 2 and a cover element 13. Naturally, a variety of valve elements can also be provided, especially for an annular piston according to Fig. 5. On the surface 28 on the product side of the piston body 2 there is a projection 30 which penetrates into a corresponding recess 31 of the surface 29 on the actuation side of the cover element 13. The projection 31 according to FIG. 1 or the projection 32 according to FIG. 4 are a flute that is arranged as part of a ring around an axis of the piston 9. Due to the special contour, the flute has a sealing element function. Therefore, protrusion 32 touches recess 33 along the entire common surface. Here, too, the sealing function is again obtained by the difference in shrinkage of the different materials. For example, the shrinkage in a polyamide is on average 0.8% and in the case of a low density polyethylene it is 2.2%. The difference between polyamide and low-density polyethylene will therefore correspondingly be 1.4% that is to say that a low-density coated polyamide building element, in a cold state, and conditioned by the greatest shrinkage, is integrated. sealingly in the polyethylene jacket. A variety of protrusions 31, 32 may be arranged at different radial distances from the piston axis which is shown in figure 2.
    [0040] The covering element 13 contains an element in the form of a pin 19 which extends through the piston body 2 to the actuating side of the piston 1. The pin element 19 is shaped as a conical fitting element. In addition, the pin element 19 has rotational symmetry with respect to the axis of the piston 9.
    [0041] The covering element 13 or the piston body 2 may also contain a ventilation element 14. This ventilation element serves to remove from the internal piston compartment gases resulting from gas pockets formed, for example, in the piston insert on the wall of the cartridge. Especially in this case the gas can be air. The projections 31, 32 are arranged advantageously out of phase with one another so that the gas can flow along a curvilinear connecting path. By the arrangement of the protrusions 31, 32 a labyrinth-like structure is formed.
    [0042] An example of a ventilation element 14 of this type is shown in section in figure 1 and in figure 3 in a view of the piston 1 on its product side 3. Hence the ventilation element 14, the gas that is in the cartridge inner compartment 17, between the filling mass and piston 1, may flow outwards, that is, it may escape to the drive 4 side without the filling mass exiting. Vent element 14 will be closed while cartridge 17 is positioned in a full state. If the filling mass is to be discharged, the discharge element 10 with the piston 1 will be brought into contact on its actuation side 4. In this case, the discharge apparatus may make contact with a pin-shaped element 19 or an element of valve 22 of the covering element 13. The pin-shaped element 19 or the valve element 22 can be opened via an opening element which is in connection on the drive side with the discharge apparatus 10, whereby, the pin 19 hangs from its seat 20 when the discharge apparatus 10 comes into contact with the drive side 4. In this process a flow path for the gas is opened. Through the jacket-shaped support element 21 of the cover element 13, the gas enters the intermediate compartment between the cover element 13 and the piston body 2 and leaves the reserve chamber through the piston over the open flow path, crossing the opening between the pin element 19 and the seat 20 or between the valve element 22 and the seat 24. After activation of the valve element 22, the sealing will be ensured through the repositioning behavior of the concave contour of the cover element 13 Especially, the concave contour can be formed as part of a spherical surface. Commonly, as ventilation elements 14, several small ventilation slots are provided in the sleeve-shaped support element 21.
    [0043] In connection with this ventilation slot, a labyrinth-like connecting path may be provided between the piston body 2 and the covering element 13. Filler material that eventually passes through the ventilation slot will be deposited along this connecting path in labyrinth shape. This connecting path is closed in figure 1 because the covering element is positioned directly and completely on the product side surface of the piston body 2.
    [0044] Piston 1 has means against the output of the mass filler on the drive side. For this purpose, along the sliding face on the wall 17 of the cartridge 16, at least one sealing lip will normally be provided. In the present embodiment, this sealing lip is shown as a conductive element 7. The conductive element 7 is located on a projection 6 which extends between the groove 23 and the wall 17 of the cartridge 16. In the embodiment, the projection 6 is a thin-walled, rotating symmetry body, which is visible in the one-arm shaped cut presentation of the piston body 2.
    [0045] It is not visible in the cutaway image that the arm is part of an annular protrusion that extends along the entire circumference of the piston body 2 and that, through the conductive element 7, forms a dense fluid connection with the wall of cartridge 17.
    The protrusion 6 presents a conductive element 7 for driving the piston in a cartridge 17, suitable for producing a sealing contact with a wall 16 of the cartridge 17. The conductive element 7 can be specially shaped as a sealing lip. If necessary, a variety of sealing lips can also be provided. Alternatively or complementary, the piston liner 5 may also contain a cutout 25 for a sealing element such as, for example, an O-ring. The advance 6 comprises a scraper element 8 which, in an unassembled state, has a smaller distance from the side of the product 3 than the conductive element 7.
    [0047] At the beginning of the discharge of the filling mass with a piston according to figure 1, the protrusion 6 is already inside the internal compartment of the cartridge 17. In the assembled state, the piston does not rest with the conductive element 7 on the wall 16 of the cartridge. The filler mass is located on the product 3 side of the piston. If the piston body 2 is now moved by a discharge apparatus not shown, in the direction of the piston axis 9, against the filler mass, a pressing force will act from the filler mass to the piston. This pressing force also acts on the protrusion 6. The protrusion 6 advantageously has a bearing face 11 which, under the action of the pressing force, is moved towards the wall 16. By internal pressure, therefore, an eventual gap between the face of support, i.e. the corresponding scraper element 8, and the wall 16 becomes smaller. When the filler mass contains solid substances, individual particles cannot reach the gap between the bearing face 11 and the wall 16. Therefore, the bearing face 11 is arranged in such a way that any particles of solid substances, captured by the scraper element 8 , will be unloaded together with the filling mass. If discharging is continued, the particles will always slide further on bearing face 11 towards groove 23.
    [0048] On the drive 4 side of the piston a tip-over protective element 18 is mounted which serves to improve the conduction of the piston in a cartridge 17. Additionally, the tip-over protective element 18 can function with a second sealing lip, especially to ensure the tightness also when the first sealing lip is no longer tight. By the overturning protective element 18, which element is in contact with the wall 16 of the cartridge 17, the piston will be made to overturn proof, which means that the axis of the piston body 2 coincides with the axis of the piston 9. Through the tipping protective element 18, it is ensured that the product side 3 is aligned in a normal plane to the piston axis 9 or when the product side 3 is not a flat surface or if it contains segments that are not situated in a plane, whereby points on the piston surface on the product side, characterized by a given radius and a given height, are situated along the circumference in essentially the same normal plane. If piston 1 were to tip over, the condition for such points of rotational symmetry would no longer be met. Thanks to a tipping protection element 18 of this type, circumferential contact with the wall 16 of the cartridge 17 can be preserved during the entire discharge process, so that, altogether, a deviation of the piston 1.
    [0049] Unlike Figure 1, Figure 4 shows that on the surface 29 of the piston body 2, on the product side, a protrusion 32 is provided that penetrates into a corresponding cutout 33 of the surface 28 of the cover element 13, on the side of the drive. This protrusion also acts as a seal.
    [0050] Figure 5 shows an annular piston 51 as it has been used, for example, for coaxial cartridges. This presentation does not contain the mechanical fastening or anchoring described in connection with the previous examples of embodiment, a valve pin, as well as sealing elements, especially circular sealing elements which can also be provided in the same way in this example of embodiment. In a coaxial cartridge there are 2 or more cylindrical hollow compartments, arranged in a reciprocal coaxial direction. Each of these hollow compartments is filled with a component. The hollow compartment, or the inner hollow compartments, will be completely surrounded by the outer hollow compartment which is shaped like a cylindrical-shaped cartridge.
    [0051] The annular piston 51 involves a piston body 52 which is generally produced in an injection molding process from synthetic material, ie plastic. Preferably the annular piston 51 is used to discharge a filler mass, especially fluid or pasty products, from a cartridge. The filler mass can also especially contain particles of solid substances. A wall 16 of the cartridge 17 is shown. The annular piston 51 slides along the wall 16 and in this movement discharges the filler mass through a discharge opening not shown. The side of the annular piston 51, facing in the direction of the filler mass, will in the following be referred to as the product side 53. discharge. The discharge apparatus, not shown here, is on the side of the piston opposite the side of the product 53. This side will hereinafter be referred to as the drive side 54.
    [0052] Inside the inner tube 67 is normally arranged another piston, hereinafter also referred to as the inner piston, which is not shown in figure 5. This inner piston is shaped as a piston in the example of execution according to figure 1. The inner piston it will be moved simultaneously with the annular piston 51 in order to discharge the filling mass from the reserve regions of the cartridge 17. Then, therefore, only the conformation of the annular piston 51 will be addressed.
    [0053] The piston body 52 will therefore be limited by the drive side 54, the product side 53, as well as an external piston liner and an internal piston liner 55. The external piston liner 5 can have the same structure as in the previous examples of execution. The inner piston liner 55 forms the internal connection between the drive side 54 and the product side 53. The inner piston liner 55 limits the piston body 52 to an inner side 59, facing in the direction of the piston axis 9.
    [0054] The internal piston liner 55 converges on the product side 53 on a boss 56. In the example embodiment, the boss 56 is a thin-walled, rotating symmetry body that is visible in an arm-shaped cut presentation of the piston body 52. The protrusion 56 has an inner conductive element 57 for driving the annular piston 51, i.e. in the direction of the axis of the piston 9, for example, along an inner tube 67. The conductive element 57 is adapted to producing a sealing contact with a wall 66 of the inner tube 67. The conductive element 57 can be specially shaped as a sealing lip. If necessary, a variety of sealing lips could also be provided. The protrusion 56 may comprise a scraper element 58 which has a shorter distance to the product side 53 than the conductive element 57. To determine the distance, the dimension of the annular piston which comes closest to the filler mass will be determined. even inside the filling mass. This measurement can be in the case of a single piston, the surface of the piston, or the covering element 63 which covers the surface of the piston.
    [0055] The conductive element 57 abuts the wall 66 of the inner tube 67 and seals the inner compartment of the cartridge containing the filler mass against the environment, so that an exit of the filler mass on the drive side is prevented.
    [0056] The end section of the piston liner 55 which contains the conductive element 57 is followed by a bearing face 61 which is integrated at 80° and 110°, especially essentially, in a normal position to the piston axis 9. Therefore, the bearing face 61 is arranged in such a way that any particles of solid substances, captured by a scraper element 58, will be discharged together with the filling mass. When the bearing face 61 is disposed essentially in the direction normal to the piston axis, the solid substance particles can move in the direction of the piston axis. In this way, an accumulation of particles of solid substances in the region close to the wall can be avoided.
    [0057] The annular piston 51 may also contain a self-ventilating element, which is not shown here in the drawing. The piston body 52 also has reinforcing ribs 65 as well as a tipping protective element 18, 64. In addition, the covering element 63 can be shaped in a similar manner as described in connection with figures 1 to figure 4.
    [0058] The covering element 63 of the annular piston 51, as shown in Figure 5, has a surface 77 on the product side, as well as a surface 79 on the drive side. The piston body 52 represents a product side surface 78. Also part of this example of embodiment it can be seen that the surface 79 of the cover element, on the drive side, rests completely on the surface 78 on the product side of the piston body 52.
    权利要求:
    Claims (14)
    [0001]
    1. Piston (1.51) having a product side (3.53), a drive side (4.54) opposite the product side (3.53) as well as a piston body (2 .52) which is circumferentially limited by a piston liner (5.55), wherein the product side (3.53) covers a surface (28.78) of the product side, as well as a connection is formed between the product side (3.53) and the drive side (4.54) by the piston liner (5.55), with the piston liner (5.55) being arranged around a piston shaft ( 9) and is joined with the piston body (2,52) via a fillet element (26,76), so that a surrounding groove (23,73) surrounds the product side surface ( 28.78) is formed on the product side (3.53) between the piston body (2.52) and the piston jacket (5.55), with a covering element (13.63) being on the product side (3.53), which has a product side surface (27.77) and a drive side surface (29.79) then, and whose surface (29.79) on the drive side rests directly, in complete form, on the surface (28.78) of the product side relative to the piston body (2.52), characterized by the fact that covering element (13, 63) has a pin element (19) or a valve element (22) that extends through the piston body (2.52) to the drive side (4.54) of the piston (1.51 ).
    [0002]
    2. Piston according to claim 1, characterized in that the surface (27.77) on the product side of the covering element (13.63) has a concave curvature
    [0003]
    3. Piston according to any one of the preceding claims, characterized in that, on the surface (28.78) on the product side of the piston body (2, 52), a protrusion (30) is provided, which penetrates into a corresponding cutout (31) of the drive side surface (29.79) of the cover element (13.63) and/or the surface (28.78) on the product side of the piston body (2.52) is A protrusion (32) is provided which penetrates into a corresponding cutout (33) of the surfaces (29.79) on the operating side of the cover element (13.63), so that the protrusion (32) touches the cutout (33) along the entire common surface.
    [0004]
    4. Piston according to claim 3, characterized in that the protrusions (31,32) are a flute arranged as part of a ring around the piston axis (9) and/or a variety of protrusions (31, 32) arranged at variable radial distances from the piston axis (9).
    [0005]
    5. Piston according to claim 4, characterized in that the protrusions (31,32) are provided for each other, at least partially out of phase.
    [0006]
    6. Piston according to claim 1, characterized in that the pin element (19) and/or the valve element (22) are movable relative to the piston body (2.52) so that it can a connecting path is formed between the valve element (22) and the piston body (2,52).
    [0007]
    7. Piston according to claim 6, characterized in that the pin (19) or the valve (22) each have a corresponding end, which goes beyond the surface of the drive side of the piston body (2.52) , so that the pin (19) or the valve (22), through the action of a pressure force, can be suspended from the corresponding seat, so that, for ventilation purposes, a ventilation slot can be formed, as well as, a connecting path between the cover element (13,63) and the piston body (2,52).
    [0008]
    8. Piston according to claim 7, characterized in that the pin (19) and/or the valve (22) are shaped as a conical fitting.
    [0009]
    9. Piston according to any one of claims 7 to 8, characterized in that the pin (19) is of rotational symmetry with reference to the axis of the piston (9).
    [0010]
    10. Piston according to any one of the preceding claims, characterized in that, on the product side surface of the covering element (13,63), on its outer circumference, a supporting element (21) is mounted in shape of a shirt.
    [0011]
    11. Piston according to claim 10, characterized in that the sleeve-shaped support element (21) protrudes into the groove (23).
    [0012]
    12. Piston according to claim 11, characterized in that the groove (23) has a groove base (36) and in a groove base (36) a receiving element (37) is integrated into which the edge (35) of the supporting element (21) in the form of a jacket.
    [0013]
    13. Piston according to any one of claims 10 to 12, when dependent on claim 7, characterized in that the sleeve-shaped support element (21) contains at least one ventilation slot (14) that can be joined with the ventilation slot as well as the connection path.
    [0014]
    14. Process for the production of a piston as defined in any one of the preceding claims, characterized by the fact that it covers spaces in the production of the piston body in the injection molding process and subsequent application of the covering element in the injection molding process of multiple components on the same injection molding device.
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    同族专利:
    公开号 | 公开日
    EP2509718A1|2012-10-17|
    KR20120123027A|2012-11-07|
    AU2010329898A1|2012-07-05|
    IN2012DN05080A|2015-10-09|
    EP2509718B1|2016-11-30|
    TWI510298B|2015-12-01|
    SI2509718T1|2017-04-26|
    CN102770217B|2016-01-13|
    US20120247323A1|2012-10-04|
    CN102770217A|2012-11-07|
    TW201132417A|2011-10-01|
    WO2011070082A1|2011-06-16|
    AU2010329898B2|2014-12-04|
    CA2783924A1|2011-06-16|
    KR101833406B1|2018-02-28|
    US9144821B2|2015-09-29|
    ES2617329T3|2017-06-16|
    BR112012013661A2|2020-10-27|
    CA2783924C|2018-05-15|
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    DE102017203241A1|2017-02-28|2018-08-30|Fischbach Kg Kunststoff-Technik|Piston for cartridges|
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    EP3501670A1|2017-12-20|2019-06-26|Sulzer Mixpac AG|Piston, cartridge and method of venting a cartridge|
    EP3501782A1|2017-12-20|2019-06-26|Sulzer Mixpac AG|Method of making a two-component piston, injection mold for a two-component piston, two-component piston and cartridge|
    US10968031B2|2017-12-27|2021-04-06|Sulzer Mixpac Ag|Piston for a collapsible cartridge|
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    法律状态:
    2020-11-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-06-01| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-07-20| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 08/12/2010, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP09178940.4|2009-12-11|
    EP09178940|2009-12-11|
    PCT/EP2010/069199|WO2011070082A1|2009-12-11|2010-12-08|Cartridge piston|
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