EP2230374A2 - String-shaped seal profile - Google Patents

Abstract

The profile (10) has an anchor foot (20) that engages an undercut receiving groove (80) of a profile (90). A transition section (30) is provided adjacent to the anchor foot. A base section (40) is provided adjacent to the transition section. A closed cavity extends into the anchor foot and into the transition section and comprises two cavity sections (52, 54), where the constant clearance (G) of one of the cavity sections (54) is lesser than the constant clearance (H) of the other cavity section.

Description

The present invention relates to a strand-shaped sealing profile according to the preamble of claim 1 and a sealing system which has such a strand-shaped sealing profile.

The FR 1 242 975 shows a sealing profile with an anchor foot. From the pamphlets DE 297 14 204 U1 . DE 94 15 923 U1 and DE 38 43 357 A1 are sealing profiles with anchor feet known, in each of which a cavity is provided. The cavities in this case have different shapes or configurations, without being executed in any way, as the configuration of the cavity affects the applied impression force when pressing the corresponding sealing profile in the associated receiving groove. It has been repeatedly found that it is difficult in the assembly of strand-shaped sealing profiles in the corresponding grooves, depress the sealing profiles in the grooves, as relatively high indentation forces of about 800 to 900 N / m are required.

The present invention is therefore based on the object to propose a strand-shaped sealing profile in which the assembly forces are reduced when pressing the sealing profile into the associated receiving groove.

This object is achieved with a strand-shaped sealing profile according to claim 1 and with a sealing system containing such a strand-shaped sealing profile according to claim 16. Advantageous developments of the invention are the subject of the dependent claims.

The strand-shaped sealing profile according to the invention has an anchor foot, with which it can be inserted into an undercut receiving groove of a profile, in particular locked, can be. Examples of such profiles are windows or doors. At the anchor foot, a transition section connects, which in turn continues in a base section. In the anchor foot and the transition section is a cavity which is substantially closed. "Substantially closed" here means that even if there are inadvertently small openings or cracks that connect to the outside world and that arise, for example, during the manufacturing process or use, the cavity is considered to be closed. The cavity has a first cavity portion having a substantially constant first clear width. "Substantially constant clear width" is intended here to mean that small deviations from a constant clear width or from a constant inner dimension of the cavity are still regarded as not affecting the constancy of the clear width. Such small deviations can be caused, for example, by tolerances in the production process, by corresponding temperature influences or deformations that may have taken place. The present invention is characterized in that the cavity further comprises a second cavity portion having a, again substantially constant, second clear width, wherein the second clear width is smaller than the first clear width. In other words, the cavity thus comprises two cavity sections, which in each case form a rectangle in cross section through the longitudinal extent of the sealing profile strand. Even rounding at the ends of the cavity or at the transitions from one cavity portion to the other cavity portion are not to be regarded in the way that therefore the clear width would not be constant. Due to the inventive design of the cavity provided with the strand-shaped sealing profile, the required mounting forces for pressing the sealing profile into a corresponding receiving groove can be significantly reduced.

According to an advantageous embodiment of the invention, the first cavity section extends at least over the entire extent of the transitional section, wherein the second cavity portion is located in the region of the anchor foot. Since in this embodiment, the cavity portion with the smaller clear width in the region of the anchor foot and thus is in the region of that part of the sealing profile, which is first pressed into the receiving groove, the force required for this Eindrückkraft can be further reduced.

Preferably, the first cavity section is bounded in the direction away from the second cavity section by an at least substantially planar first boundary surface. In addition, the second cavity section is preferably delimited in the direction away from the first cavity section by a substantially planar second limiting surface. "Substantially plane boundary surface" here means that it is preferred that the respective boundary surface is as flat as possible, whereby also slightly concave or convex surfaces or only slightly irregular surfaces are to be understood hereunder.

The indentation forces can be further reduced if the first cavity section with its first clearance does not pass in a kind of step into the second cavity section with its second clearance, which is smaller than the first clearance, but between these two cavity sections a third cavity portion is located, the clear width continuously or continuously passes from the first clear width into the second clear width, so that a rounded as possible transition from the first to the second cavity portion is formed.

It is preferable that the base portion has two abutment portions each extending outwardly away from each other. The two base sections are each limited in the direction of the armature foot by a support surface, which in the course of the depression of the anchor foot in the receiving groove to engage in the profile or can, in which the receiving groove is located. The two bearing surfaces extend in a plane, ie perpendicularly away from a median plane of the sealing profile. Such sealing profiles are symmetrical in many cases in a direction perpendicular to their longitudinal extent. Consequently this central axis is also the axis of symmetry at the same time. To simplify the illustration and description below, it is assumed that the sealing profiles are symmetrical. It should be noted, however, that non-symmetrical sealing profiles are considered to belong to the invention. The inventive design of the abutment sections a good seal is made to the profile containing the receiving groove, which is usually designed on both sides of the receiving groove so that the adjacent surfaces extend in a plane. However, should these surfaces be arranged at an angle to each other, it is recommended that the bearing surfaces of the abutment sections are arranged at the same angle.

If the first boundary surface and the two bearing surfaces of the abutment sections lie in one plane, ie aligned with one another, ideal stress profiles can be achieved within the profile of the profile seal during the indentation of the profile seal into the receiving groove. Thus, the impressions of the sealing profile is facilitated in the receiving groove and the sealing profile hereby mechanically stressed not so strong.

The anchor foot preferably has two latching projections which extend outwards, ie away from one another. Usually, these locking projections are symmetrical to each other with respect to the plane of symmetry, which extends in the extension direction of the sealing profile strand. The latching projections are each limited by a latching surface in the direction of the base portion. These two locking surfaces lie in the state in which the anchor foot is pressed into the receiving groove, on the projections of the receiving groove, which form the undercut to. Thus, a certain spring action is achieved in an attempted pulling out of the sealing profile or the anchor foot from the receiving groove, which increases the necessary for the removal of the anchor foot from the receiving groove pull-out. In other words, this increases the pull-out strength, which, with a suitable design of the geometry, can achieve about 50% of the pull-out forces customary according to the prior art.

It is advantageous if the two latching surfaces extend in one plane, since usually the associated surfaces on the surfaces of the receiving grooves forming the undercut are likewise designed as surfaces located in one plane. If the sealing profile according to the invention is used in receiving grooves whose respective surfaces are arranged at an angle to one another, it is advisable to design or arrange the locking surfaces of the sealing profile accordingly.

The two latching projections project from the transition section preferably by a length which is about 5 to 13% of the second clear width, the length being more preferably 8 to 10%, particularly preferably about 9.1%, of the second clear width. By appropriate design of the locking projections, the spring action and thus the pull-out can be optimized.

It is advantageous if the anchor foot has a projection extending away from the base section at that of its ends, which faces away from the base section. The projection thus extends between the two locking projections. The boundary lines of the projection are - viewed in cross section of the anchor foot - preferably straight, but may also be concave or convex, and converge towards a common tip. Of course, such a tip can also be rounded. By this tapered design of the anchor foot the impressions of the anchor foot is facilitated in the receiving groove.

It is particularly preferred if the projection in the region of its tip in the direction from the base section to the tip has a wall thickness which is about 45 to 100% of the second clear width, wherein a wall thickness in the range of about 63 to 83% is preferred and of about 73% of the second clear width is particularly preferred. In this way, a further reduction of the forces required to push the sealing profile into the receiving groove can be achieved without overly impairing the stability or shape retention of the anchor foot when impressed.

The indentation forces for the anchor root can be further reduced if the first clear width has a ratio to the second clear width that is in the range of about 1.5 to 2.5, in particular in the range of about 1.9 to 2.1 with a ratio of about 2.0 being particularly preferred.

A further reduction in the indenting forces can be achieved if the height of the first cavity portion has a ratio to the height of the second cavity portion that is in the range of about 2.0 to 3.0, with a range of about 2.4 to 2.6 preferred and a ratio of about 2.5 is particularly preferred. The term "height" in this context means the dimension in the extension direction from the base section to the tip. In the case in which a third cavity section is provided between the first and the second cavity section, the height of the first or the second cavity section should in each case be measured up to the middle of the third cavity section or be defined as reaching this center ,

Preferably, the transition section in the region of the first cavity portion has a wall thickness which is about 45 to 100%, preferably about 63 to 83%, and more preferably about 73%, of the second clear width.

The object mentioned above is also achieved by means of a sealing system, which on the one hand has a rope-shaped sealing profile according to the above description and on the other hand has a profile which has a receiving groove provided with an undercut for receiving the anchor foot.

In order to further facilitate the impressions of the anchor foot through the undercut of the receiving groove, it is preferred that the anchor foot has two latching projections which extend outwardly - ie away from one another. In this case, each locking projection on an overall length which is smaller than half the clear width of the receiving groove at the narrowest point of the undercut. Here, the total length of the distance between the outermost end of each locking projection is understood to its end at the cavity of the anchor foot. By this arrangement it is avoided that during the Eindrückvorgangs the inner walls of the cavity touch and thus complicate a pressing of the anchor foot in the receiving groove.

Fig. 1

eine erste Ausführungsform des erfindungsgemäßen strangförmigen Dich- tungsprofils im Querschnitt,

Fig. 2

eine zweite Ausführungsform des erfindungsgemäßen Dichtungsprofils im Querschnitt; und

Fig. 3

eine dritte Ausführungsform des erfindungsgemäßen Dichtungsprofils im Querschnitt.

Further advantages, features and special features of the present invention will become apparent from the following description and description of advantageous embodiments. Show it:

Fig. 1

A first embodiment of the inventive strand-shaped sealing profile in cross section,

Fig. 2

a second embodiment of the sealing profile according to the invention in cross section; and

Fig. 3

a third embodiment of the sealing profile according to the invention in cross section.

Such sealing profiles are usually produced in a strand as a continuous product, wherein the direction along the strand, the direction of extension or

Represents longitudinal direction. The plane perpendicular thereto forms the cross-sectional plane, wherein the right-left direction in the figures referred to as the width direction and the top-bottom direction is referred to as height direction. Such strand-shaped sealing profiles are in many cases symmetrical to a central axis, as it is also shown in the figures, wherein in the respective cross sections, the height direction represents the plane of symmetry. Of course, the invention is also applicable to non-symmetrical strand-shaped sealing profiles. To simplify the illustration and explanation, however, it is assumed below of a symmetrical configuration of the strand-shaped sealing profiles. In addition, all explanations are given with regard to the cross sections shown in the figures - ie with respect to a two-dimensional representation - and not to the actual three-dimensional design, since nothing changes in the direction not shown in the drawings.

Fig. 1 shows a first embodiment of the strand-shaped sealing profile 10 according to the invention in cross section. The sealing profile 10 is subdivided into three subregions: First, an anchor foot 20, which is intended for insertion into a receiving groove 80 of a profile 90, wherein it is locked with an undercut of the receiving groove 80, which will be discussed later; second, a transition section 30, which adjoins the anchor leg 20; and thirdly, a base section 40 which adjoins the transition section 30 and which then comprises the actual sealing section not shown here.

The anchor foot 20 is approximately triangular with rounded corners. At its upper end, the anchor foot 20 on the left and on the right each have a rounded latching projection 22, whose upper side is bounded in each case by a latching surface 23. The lower end of the anchor foot 20 is formed by a rounded tip 27. Between the tip 27 and the locking projections 22 of the anchor foot 20 as shown in FIG Fig. 1 with straight lines. However, the connection from the rounded corners of the locking projections 22 to the rounded tip 27 may also be convex, concave or formed with a plurality of convex and / or concave portions. Above the anchor foot 20 is immediately followed by a transition section 30, which represents the connection to an overlying base portion 40. The base portion 40 has here to the left and a right projecting abutment portion 42 which are each limited to the anchor foot through a support surface 44. At the top of the base portion 40, the actual seal is not shown here - often referred to as a sealing lip - connects.

A cavity 50, which is subdivided into three cavity sections, extends within the transition section 30 and the anchor foot 20. A first cavity section 52 at the top is formed by two straight side faces 51, shown perpendicularly here, as well as a likewise straight boundary face 53, shown here above limited. The corners between the side surfaces 51 and the boundary surface 53 are rounded, but this does not necessarily have to be so. Since the two side surfaces 51 are straight, is the clear width H of the first, upper cavity portion 52 is constant or substantially constant. The lower end of the cavity 50 forms a second cavity portion 54, which is delimited to the left and right by two likewise planar, vertical, side surfaces 59. The lower end of the second cavity 54 is bounded by a flat second boundary surface 55. Since the two side surfaces 59 are straight, they define the second cavity portion 54 with a constant second clear width G. The transition between the first cavity portion 52 and the second cavity portion 54 forms a third cavity portion 56 bounded by two inclined boundary surfaces 57. These boundary surfaces 57 form a continuous or sliding transition between the clear width H and the clear width G of the cavity sections 52 and 54, respectively Fig. 1 rounded, which is advantageous, but not necessarily required.

Below the anchor foot, a profile 90 is shown, in which a receiving groove 80 is provided, in which the anchor foot 20 is to be introduced. The profile 90 has on its upper side two latching projections 92, which extend toward one another and are each delimited on their underside by a latching surface 94. The two latching projections 92 with their latching surfaces 94 form with the underlying receiving groove 80 an undercut, which is accessible via an inlet opening 82 with a clearance D. The undercut sealing profile 90, in turn, forms a sealing system with the sealing profile 10.

When the sealing profile 10 is pressed from above through the inlet opening 82 into the receiving groove 80, the anchor foot 20 and the transition section 30, which consists essentially only of the two wall sections 32, deforms first. In this case, the two latching projections 22 and the wall portions 32 are bent inwardly, so that the cavity 50 is correspondingly reduced or narrowed. The deformation takes place in the course of pushing through the armature foot 20 and its locking projections 22 through the inlet opening 82 so strong until the two locking projections 22 have completely passed through the inlet opening and then again both can move outward. This deformation process can be carried out particularly efficiently if the two latching projections 22 each have only such a thickness C which is smaller than half the clear width D of the inlet opening 82. In this way, the side surfaces 51 of the first cavity portion 52 do not touch when the anchor foot 20 is pressed with its locking projections 22 through the inlet opening 82 therethrough. After the two locking projections 22 have moved outward again, the two locking surfaces 23 which delimit them upwardly come into abutment with the two latching surfaces 94 which delimit the latching projections 92, whereby a seal is achieved.

The forces required to press the anchor leg 20 into the receiving groove 80 through the inlet opening 82 can be optimized if the respective dimensions are coordinated with one another. In addition to the already described relation between the length C of the latching projections 22 and the clear width D of the inlet opening 82, this also includes the following: the second clear width G of the second cavity section 54 forms a ratio of 1: 2 relative to the first clear width H of the first cavity section 52 , In addition, the ratio of the height E of the second cavity portion 54 to the height F of the first cavity portion 52 is 1: 2.5. At the in Fig. 1 In the illustrated embodiment, the term "height of the first and second cavity sections respectively means the dimension from the respective second boundary surface 55 and first boundary surface 53, respectively, to the center of the third cavity section 56. Further, the cavity 50 and the first cavity section 52, respectively, in the transition section 30 delimits two wall sections 32, which has the same wall thickness I as the distance I between the (rounded) tip 27 of the anchor foot 20 and the second boundary surface 55. These wall thicknesses I are preferably about 73% of the second clear width G. In addition, the deformability also improved when the first boundary surface 53 of the first cavity portion 52 lie in a plane with the two bearing surfaces 44 of the contact portions 42 of the base portion 40.

A simple impressions of the anchor foot 20 in the receiving groove 80 without unbalanced bending of the anchor foot 20 and the transition section 30th and a uniform concern of the locking projections 22 on the latching projections 92 is thereby made possible when the two locking surfaces 23 extend in a plane, in particular extend perpendicular to the central axis.

Fig. 2 shows a second embodiment of the sealing profile according to the invention in cross section. This second embodiment is similar in many ways to the first embodiment. The matching details are not explained again to avoid unnecessary repetition. The differences from the first embodiment are as follows: The cavity 50 has only the two cavity portions 52 and 54, but no intermediate cavity portion 56. During the transition from the first cavity portion 52 to the second cavity portion 54 in the first embodiment by the third cavity portion 56th is continuous and therefore fluid, the transition from the first cavity portion 52 to the second cavity portion 54 in the second embodiment is stepped. Another difference is that the first cavity portion 52 extends slightly into the base portion 40 at its upper end. That is, the first boundary surface 53 is not in a plane with the two bearing surfaces 44 of the bearing portions 42 of the base portion 40. In addition, the two transitions from the locking projections 22 to the rounded here also tip 27 are not straight, but they are concave, so the tip is more pronounced here.

In Fig. 3 a third embodiment of the sealing profile according to the invention is shown. The matching details are not explained again to avoid unnecessary repetition. This third embodiment differs from the first embodiment only in that the cavity 50 is disposed inversely in the armature foot 20 and the transition portion 30. In other words, in this third embodiment, the second cavity portion 54 is with its clearance G above, while the first cavity portion 52 is located with its clear width H down. In addition, the cavity 50 is located somewhat further from the tip 27 of the anchor foot.

As soon as the two latching projections 22 have passed through the inlet opening 82 and are thus latched to the latching projections 92 of the profile 90, this arrangement forms a kind of spring when it is attempted to pull the anchor base 20 out of the receiving groove 80 again through the inlet opening 82. This spring effect increases the pull-out strength of the sealing profile according to the invention. Moreover, the coordination of the individual dimensions with one another as explained above can not only minimize the indentation forces, but can also improve the pull-out strength.

With the sealing profile 10 according to the invention, it is possible to reduce the indentation forces required for pressing in the anchor foot 20 into the receiving groove 80 by 50 to 55% compared with the previously known sealing profiles. While up to now about 800 N / m of impression forces were required, according to the invention, the sealing profile is less than 400 N / m. By approximately the same factor, but by at least 25 to 35%, in this case the pull-out forces or the pull-out strength can be increased, which is very important for a permanent retention of the sealing profile in the receiving groove.

Thus, according to the invention, for example, a sealing profile can be provided which measures approximately 4.3 mm from the armature foot-side end of the base section 40 to the tip 27, the cavity 50 having an overall height E + F of approximately 3.5 mm. Here, the locking projections 22 each have a total length C of about 1.5 mm and project about 1 ± 0.4 mm outwards, and the wall thicknesses in the transition section 30 and at the top 27 are about 0.8 ± 0.3 mm. Accordingly, then the clear width D of the inlet opening 82 of the receiving groove 80 of the profile 90 is about 3.2 mm.

It should be noted that the features described with reference to the illustrated and described embodiments, the invention, such as the nature and location of the individual cavity portions, locking projections and contact surfaces and their configuration in detail, may also be present in other embodiments, unless otherwise specified or it bans itself for technical reasons.

Bezuaszeichenliste

10

weatherstrip

20

anchor foot

22

catch projection

23

Rest area

26

head Start

27

top

28

boundary line

30

Transition section

32

wall section

40

base section

42

contact section

44

bearing surface

50

cavity

51

side surface

52

first cavity section

53

first boundary surface

54

second cavity section

55

second boundary surface

56

third cavity section

57

Side wall

59

side surface

80

receiving groove

82

inlet opening

90

profile

92

catch projection

94

Rest area

C

length

D

clear width of 80

e

Height of 54

F

Height of 52

G

clear width of 54

H

clear width of 52

Claims (17)

Strand-shaped sealing profile (10), comprising
an anchor foot (20) for engagement in an undercut receiving groove (80) of a profile (90);
a transition section (30) adjoining the anchor foot (20); and
a base portion (40) adjoining the transition portion (30);
a substantially closed cavity (50) extending in the anchor base (20) and the transition section (30) having a first cavity portion (52) having a substantially constant first clear width (H) and
wherein the cavity (50) has a second cavity portion (54) having a substantially constant second clear width (G) that is smaller than the first clear width (H). Sealing profile (10) according to claim 1,
wherein the first cavity section (52) extends at least over the entire extent of the transition section (30) and the second cavity section (54) is located in the region of the anchor foot (20). Sealing profile (10) according to claim 1 or 2,
wherein an at least substantially planar first boundary surface (53) forms the boundary of the first cavity section (52) in the direction away from the second cavity section (54). Sealing profile (10) according to one of the preceding claims,
wherein an at least substantially planar second boundary surface (55) forms the boundary of the second cavity section (54) in the direction away from the first cavity section (52). Sealing profile (10) according to one of the preceding claims,
wherein the cavity (50) between the first cavity portion (52) and the second cavity portion (54) has a third cavity portion (56), the inside width of which continuously merges from the first clearance (H) to the second clearance (G). Sealing profile (10) according to one of the preceding claims,
wherein the base portion (40) has two outwardly extending abutment portions (42) which in the direction of the anchor foot (20) are each limited by a support surface (44), wherein the two bearing surfaces (44) extend in a plane and for abutment with a profile (90) containing the receiving groove (80). Sealing profile (10) according to claim 6,
wherein the first boundary surface (53) and the two bearing surfaces (44) lie in one plane. Sealing profile (10) according to one of the preceding claims,
wherein the armature foot (20) has two latching projections (22) extending outwardly away from each other, each being delimited in the direction of the base section (40) by a latching surface (23). Sealing profile (10) according to claim 8,
wherein the two latching surfaces (23) extend in a plane. Sealing profile (10) according to claim 8 or 9,
wherein each latching protrusion (22) protrudes from the transition section (30) by a length which is about 5 to 13%, in particular about 8 to 10%, preferably about 9.1%, of the second clear width (G). Sealing profile (10) according to one of claims 8 to 10,
wherein the armature foot (20) at its end remote from the base portion (40) has a projection (26) extending between the two locking projections (22) and extending away from the base portion (40) and having boundary lines has, which are rectilinear in cross section, concave or convex to a common tip (27) formed tapering. Sealing profile (10) according to claim 11,
wherein the projection (26) in the region of the tip (27) has a wall thickness (I) which is about 45 to 100%, in particular about 63 to 83%, preferably about 73%, of the second clear width (G). Sealing profile (10) according to one of the preceding claims,
wherein the first clear width (H) to the second clear width (G) has a ratio in the range of 1.5 to 2.5, in particular in the range of 1.9 to 2.1, preferably of about 2.0. Sealing profile (10) according to one of the preceding claims,
wherein the height (E) of the first cavity portion (52) to the height of the second cavity portion (54) has a ratio in the range of 2.0 to 3.0, in particular in the range of 2.4 to 2.6, preferably of about 2, 5, has. Sealing profile (10) according to one of the preceding claims,
wherein the transition portion (30) in the region of the first cavity portion (52) has a wall thickness (I) which is about 45 to 100%, in particular about 63 to 83%, preferably about 73% of the second clear width (G). Sealing system, comprising
a rope-shaped sealing profile (10) according to one of claims 1 to 15; and
a profile (90) having an undercut receiving groove (80) for receiving the anchor foot (20). Sealing system according to claim 16,
wherein the anchor foot (20) has two mutually outwardly extending latching projections (22) each having an overall length (C), wherein the total length (C) of each latching projection (22) is smaller than half the light Width (D) of the groove (80) at its narrowest point of the undercut.

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