DE7101099U - Extruded flexible sealing strip - Google Patents

Description

SAIAG S.p.A. IMDUSTRIA ARTICOLI GOMMA, Cirie (Turin) / Italy

Extruded flexible sealing strip

Priority: January 14, 1970; November 26, 1970 (1st Amendment)

Applicant no .: 67092-A / 70 or 70958-A / 70 Italy

The invention relates to an extruded flexible sealing strip with a longitudinally extending sealing section made of a cell-like polymer material and one with it during the extrusion welded, longitudinally extending anchoring section made of a solid polymer material and one embedded in it, also extending in the longitudinal direction, Reinforcing strips punched from sheet metal, which are in the unwinding has several cross struts connected to one another by bridge sections and thus in one piece, the bridge sections are arranged in two longitudinal rows that are spaced apart in the transverse direction have from each other. One such sealing strip is Particularly suitable for sealing car doors and engine and trunk compartments.

Are advantageous extruded flexible sealing strips of this type - in which the solid. ü, h. non-cell-like) polymer material made of a synthetic thermoplastic material (eg plasticizing polyvinyl chloride) or of a natural or synthetic material is proposed by the applicant and is economically liable. been evaluated. The advantage of such a flexible Dielitstreiiens is not only in improved Diehtwirkung due Oer softness TUs liichtabschnitts from egg 28a cellular Polymerisaterial, sonaem of the sealing strip to curvilinear shape aueh in an improved Anpasssungsfähigkeit its support alarm edge OAER its support channel compared za Sieiitstreiien which completely aas a Testing polymer material "exist. This adaptability is always noen dureib.

the resilience of the anchoring section affected, which is necessarily made of a fairly elastic plastic or rubber must exist in order to ensure a safe engagement with the edge or the channel in which the sealing strip is to be mounted is.

The invention is therefore based on the object of creating a sealing strip of the type mentioned above, which adapts to curves with a radius of ^ - 2 χ H without resistance, where H represents the height of the anchoring section in the plane of curvature, without any tendency to stretch or to have wrinkles on the outer surface of the anchoring portion a.

On a superficial point of view, this problem seems to be solvable simply in that the anchoring section is made of Solid rubber of relatively soft character is made, in which the reinforcing strip made of stamped sheet metal is embedded becomes, as it is similarly known from sealing strips, with which the invention is not concerned. In further consideration However, the problem shows that different types of requirements must be taken into account at the same time, some of which are mutually exclusive oppose. These requirements can be as follows will be written:

a) the sealing strip should be highly flexible so as not to be used when mounting on differently curved edges or channels To show resistance with undesirable rigidity, whereby the flexibility of the sealing strip must not be significantly impaired by the reinforcing strip /

b) the sealing strip must be able to do unusual tight kinks, ie. Curves with an unusually small radius of curvature to follow true to shape, so that a problem-free body design a vehicle body is enabled;

e) the sealing strip must take on its curved shape without thereby forming wrinkles or wrinkles, which, due to the

could result. This results in,

that the reinforcing strip must not be wrinkled even when the sealing strip is bent.

d) The reinforcing strip may inform the sealing strip no ^J 'Federigkeit. In other words, the reinforcing strip must have a "permanent ^{seat 11} " when the sealing strip is on

a curved support edge is mounted to avoid the tendency <tes Sealing strip to avoid loosening from its seat during assembly and operation.

e) The reinforcement strip must have slots that are wide are enough for the extruded rubbery mass to satisfactorily fill the slots such that the reinforcing strip itself is firmly held in the anchor portion.

f) The reinforcement strip must be used to extrude the Anchoring section be largely unverforisable.

g) The reinforcement strip must be sufficiently large for the material of the anchoring strip during its embossing give continuous support to achieve a uniform and regular pattern.

To solve the problem, taking into account the requirements described, it is provided according to the invention that the cross struts comprise relatively narrow struts and thus alternately relatively wide struts, between these alternately relatively narrow slots and relatively wide slots are provided, and that the bridge sections so obliquely between the Cross struts extend so that their approaches on the wide struts are closer to the longitudinal axis of the reinforcement strip than their approaches to the narrow struts.

In one of the invention also standing sealing strip, which is made of a reinforcing strip stamped from sheet metal and the rest consists of a uniform thermoplastic material is

j - 3a -

it already known (US-PS 3 31ο 928}, the bridge sections

• to be narrower than the cross struts and the outer side

• the bridge portions of edges oblique to the longitudinal axis of the reinforce- \ kung stripe form running. But there are those

Cross braces and the slots between them are all of the same width ί and run along the inner side edges of the back sections in Direction of the longitudinal axis of the reinforcementÄstr.öiffinsj. So that the The center lines of the cross struts only form a very small angle with the longitudinal axis of the reinforcement strip. With such a Training, the requirements indicated, which the invention has set itself to meet, can be not yet optimally fulfilled.

In a preferred embodiment of the invention it is provided that the outer edge of each bridge section with respect to the longitudinal axis of the reinforcement strip is inclined at an angle between 2o and 5o ° and that the width of the approach of each bridge section on the narrow strut is 0.3 to 0.7 times the width of the attachment on the wide strut.

With the sealing strip according to the invention configured in this way, all of the requirements mentioned can be met. why

this is so, it becomes clear from the following description of the figures, in the dit invention and advantageous details of Invention explained in more detail on the basis of several exemplary embodiments is. Show it:

Fig. 1, 3, 4 and 5 cross-sections turn four versions of one flexible sealing strip according to the invention;

Fig. 2 is a plan view of a development of a reinforcing strip made of stamped sheet metal according to the invention, as he is used in the sealing strips according to Figures 1, 3 »4 and 5;

6 and 7 also show two reinforcement strips in one development, as they are commonly used in known sealing strips;

Pig. 8 is a side view of the reinforcement strip according to FIG Pig. 2 in a channel-like arched state corresponding to the embodiment of FIGS. 4 and

FIG. 9 is a view similar to that of FIG. 8, but in which the reinforcing strip is shown in a position in which the sealing strip according to FIG. 4 along a curved Edge of its support member is mounted.

In FIGS. 1 to 5, parts that correspond in their function are provided with the same reference numerals.

With the reference numeral 1 in Fig. 1, a channel-shaped metal pressed part is designated, which forms part of a door frame of a Fahrseug. The bottom 3 of the link 1 has a strip-like elevation 4 of trapezoidal cross-section in the middle, while the side walls of the link 1 terminate in flanges 5 which hold a flexible sealing strip, designated as a whole by the reference numeral 2, in the channel-shaped link 1. The sealing strip 2 comprises an anchoring section 6 made of solid rubber, the profile of which is adapted to the inner contour of the channel-shaped member 1, and a sealing section 9 made of cell-like rubber which is welded to the anchoring section 6 during extrusion. The anchoring portion 6 comprises a pair of adjacent the paddles 5 arranged ribs 8, during the

Sealing section 9 has an inwardly facing channel shape, doing long edges of the channel with the sibs 8 when extruding are welded. The die section 9 has a recess at 10 for sealing engagement with the cooperating counterpart (not shown) of the vehicle body, In the anchoring sections 6 is a reinforcement strip 7 embedded in the form of a strip punched out of sheet metal, d ^ r the section 6 is reinforced in order to prevent accidental removal of the sealing strip from the channel-shaped member 1. Of the Reinforcing strip 7 has a substantially equal to the bottom wall 3 of the channel-shaped member 1, the following cross-sectional shape.

In the embodiment of FIG. 3, the bottom wall 3 of the channel-shaped member 1 is married. The sealing strip 17 comprises fine anchoring section 6 made of solid rubber to which a die section made of cellular rubber is extrusion welded. The die section 9 has three arms 9 a, 9 b, 9 c in cross section, which are welded to corresponding ribs of the anchoring section 6. This comprises a foot 18 received by the channel-shaped member 1 and a curved support section 19 which overlaps one of the flanges 5. The support strip 7 has a cross section that essentially follows the support section 19.

In the exemplary embodiment according to FIG. 4, the sealing strip 20 comprises an anchoring section 6 of channel-shaped cross-section which has teeth 21 which are arranged offset from one another on the inside for engagement with an edge on a support member (not shown). The reinforcement strip 7 is bent into a U-shape corresponding to the anchoring section in order to support the arms of the anchoring section. The die section 9 has a 3/4 circular profile and comprises an inclined radial rib 22 for sealing engagement with a counterpart, not shown. The outer surface of the anchoring section 6 is provided with an embossed pattern 28.

Fig. 5 shows a sealing strip 23 made of a circular hollow profile with a one-piece projecting tangentially therefrom

tab. 3/4 of the circumference of the circular profile consists of cell-like Suami to form the sealing section 9. The rest 1/4 of the circumference as well as a rush tasgentiale flap consist of solid rubber to form the anchor portion 6. the The flap reinforced by a reinforcement strip 7 is longitudinally provided with a series of openings 24 for fastening of the sealing strip 23 on its support member (not shown).

In all of the ax guide forms described, the anchorage strip 6 is around the middle. extruding the axially advanced reinforcement strip 7 extruded while at the same time the sealing portion is extruded 9 in Sehweißkontakt with- the Yerankerungsabschnitt 6, wherein the extrusion, curing and winding takes place of the Dichtstrei ^ e -s to a take-up drum in a continuous manufacturing process.

Figures 6 and 7 show the commonly used, punched out of sheet metal Reinforcement strips. Each of these strips comprises a plurality of transverse struts that are equally spaced from one another 61. In the execution according to Pig. 6, the cross struts are connected by bridge sections 62 which are integral with the Cross braces are and in two in the transverse direction.of each other one Spaced longitudinal rows arranged at the ends the cross struts have a distance. In contrast, the cross struts 61 are according to Pig. 7 through -in a single one, along the longitudinal axis 0-0 of the reinforcement strip extending row connected by bridge sections 63. The two well-known reinforcement strips can be used with relative success in weather strips made entirely of solid, i.e., non-cellular Rubber. In contrast, sealing strips would be based on the Pig. 1 and 3 to 5 described Kind in which the sealing section consists of cellular rubber and significantly reduces the pederiness of the sealing strip, reinforcing strips of the type according to FIGS. 6 and 7, the pederigkeit increase again by a certain amount, unless the width of the bridge sections

-T-

i -Τ

f 62, 63 would be reduced significantly. In such a case ε

however, the reinforcement strips would be easily deformable and

: would break when extruding the polymeric material that forms the anchoring section. Compared to thermo

f plastic resins such as plasticized PVC is claimed by Gumni the reinforcement strips are incomparably much stronger when ί extruding due to the low or large flowability

Toughness of rubber. Thus the width is V / of the bridge sections 62, 63 in the design according to Figures 6 and 7 in practice normally not less than the width ¥ ' the cross braces 61. If, for example, such reinforcement. touch the sealing strip for Pig. 4 uses v / earth, and the sealing strip is curved with a radius of 3H, where H in FIG. 4 is the height of the anchoring section in the plane of curvature, the sealing strip does not assume such a curvature without resistance and tends to curve with a much larger radius of about 5 H to 6 H in the case of using a Pig strip. 6 and from 8 H spring back if a strip according to FIG. 7 is used. At the same time, clearly visible gaps and corrugations appear on the outer surface of the anchoring section 6. These .wax parts are reinforced with the reinforcement strips described below 2, 8 and 9 avoided.

rig, Figure 2 shows a reinforcing strip 7 used in one of the embodiments of the sealing strip according to FIGS. 1 and 3 to 5 * the more relatively narrow struts 12 of a width A ¹ alternating with relatively wide struts 13 of a width A, wherein the struts are all a have flat, elongated rectangular shape. The cross struts 12, 13 are interconnected by two rows of bridge sections 14, 15 which are symmetrically arranged with respect to the longitudinal axis 0-0 of the strip and are spaced from the ends of the cross struts. The cross struts and bridge sections are punched in one piece from sheet metal, for example iron or steel sheet. The cross struts have relatively wide slots 22 between them

Width B, which are bridged by bridge sections 15, and. alternately therewith relatively narrow slots 23 of one width B ', which are bridged by bridge sections 14. The cross struts are perpendicular to the longitudinal axis 0-0, while the bridge sections 14, 15 run at an angle to this axis, that their approaches N on the broad struts 13 are closer to the longitudinal axis 0-0 of the reinforcing strip 7 than their approaches M on the narrow struts 12.

Each bridge section 14 »15 tapers towards the narrow strut 12 and has an outer edge 14 ', 15' which is inclined to the longitudinal axis 0-0 by an angle X, Y between 20 and 60, preferably between 20 and 40 ° . The width L dps approach M is smaller than the width L ^{1 of} the approach N, namely L is 0.3 to 0.7 times the width L ¹ without exceeding the width A * of the narrow strut 12. It is thus clear that each wide strut 13 with the bridge sections 14, 15 extending therefrom forms a relatively rigid arrangement which, however, is connected to the adjacent narrow struts 12 via relatively weak lugs Ά . If a sealing strip according to the invention is to be adapted to the curvature of a supporting edge or a supporting channel, the deformations exerted on the reinforcing strip concentrate in the area of the lugs K instead of being uniformly distributed over the length of the bridge sections. The consequence of this is that the material in the area of the approaches ΙΊ is stressed beyond the Mooke's elastic limit and therefore no longer resilient, but instead assumes a permanent fault which corresponds to the curvature communicated to the viewing strip. The inclination of the bridge sections 14, 15 in comparison to axially aligned back strips 62, 63 according to the 5 ¹ Ig. 6 and 7 increases the flexibility of the reinforcement strip due to the length of the bridge strips exceeding the slot widths B, B * and leads to an "essential further advantage, which is to be described with reference to FIGS.

* it ···· Sf

According to FIG. 2, the width A of the wide struts 13 is 1.5 to 1.7 times the width B of the adjacent wide slot 23, while the width A of the narrow struts 12 is 1.9 "to 2, 1 times the width B ^{1 of} the narrow slots 23. The width A ^{1 of} the narrow struts 12 is approximately equal to the width B of the wide slots 22, to be precise within tolerance limits of i 10 $. 15 are lined up in two rows parallel to the longitudinal axis of the reinforcement strip. The distances D and D ^{1 of} these rows from the ends of the struts are not particularly critical, but are preferably 1/6 to 1/4 of the width E of the reinforcement strip The angles of inclination X, Y can be identical or differ from one another, for example a relatively large angle X of the order of 40 ° and a relatively small angle Y of the order of 20 ° can advantageously be realized.

In the arrangement according to FIG. 2, the wide and narrow struts 13, 12 form pairs 11 which have a narrow one between them Include slot 23, two pairs 11 being separated from one another by wide slots 22. Each The pair of struts 11 provides a largely continuous support for the polymer material of the anchoring section 6 of the sealing strip during its embossing, the deformability of each pair of struts 11 during operation of the sealing strip is ensured by the bridge sections 14 and each strut pair 11 is firmly held in the polymer material is that at least the wide slots 22, if not also fills the narrow slits 23. A satisfactory rigidity of the reinforcing strip 7 after extruding the Polymer material is given by the design of the "wide scattering 13 with the bridge sections 14, 15, which of the broad struts like the stumps of branches of a tree branch off.

- 10 -

A. = 3 mm 5 ism B ¹ = 1 mm L. _ Λ mm D. = D I -

1114 ··· /

t ι ι I i * * * /

I 1 f 4 · ««

- 10 -

A particularly ge for an anchoring portion 6 made of rubber suitable reinforcement strip 7 can be dimensioned as follows, for example be;

E = 26 mm
A ¹ = B = 2 mm
X = Y = 20 °
L ^f = 2.5 mm

FIG. 8 shows the strip according to FIG. 2 in a shape that is too U-shaped curved about an axis parallel to the longitudinal axis 0-0 State for use in an anchoring section 6 according to Pig. 4, as it is most often used in practice will. Pig. 9 shows the same reinforcing strip in a curved state in which it is one of the sealing strips according to Pig. supporting edge or splash is adapted. From this Figure clearly shows that the deformation of the bridge portions 14, 15 in the areas of the approaches M on the narrow struts

12 is concentrated, from which the permanent shape of the strip 7 results after its deformation without Hückfsderung. Furthermore, it is clear from FIGS. 8 and 9 that when changing from the state from FIG. 8 to that according to FIG of the U formed by a wide strut 13 behind the leg 12 A of the "formed by a narrow strut ΐ2 " pushes and thereby an edge contact between the cross struts 12 and

13 is avoided in the area of the U-webs. As a result, at least the pressure of the U-legs 12 A, 13 A on the rubber is reduced and the sealing strip can be bent with radii of 2 H and even 1 H, where H represents the height of the anchoring section (see Fig. 4). The tendency of the sealing _strip} is to stretch and to form unacceptable wrinkles, negligibly small.

- 11 -

Claims (6)

1. Extruded flexible sealing strip with an in direction extending sealing portion from a cell-like Polymer material and one welded to it "during extrusion, Ysranking section extending in the longitudinal direction made of a solid polymer material and an embedded therein, Strengthening strips, which also extend in the longitudinal direction and are punched from sheet metal, in the development several having cross struts which are connected to one another by bridge sections and are integral therewith, the bridge sections in two longitudinal rows are arranged which are spaced apart from one another in the transverse direction, characterized in that, that the cross struts (12,13) relatively narrow struts (12) and thus alternately relatively wide struts (13) comprise, between these alternately relatively narrow slots (23) and relatively wide slots (22) provided are, and that the bridge sections (14,15) extend obliquely between the cross struts (12,13) that their approaches (N) on the wide struts (13) closer to the longitudinal axis (0-0) of the reinforcement strip (7) than their approaches (M) the narrow struts (12 ;. 2. Sealing strip according to claim 1, characterized in that the outer edge (H ¹ , 15 ') of each bridge section (14,15; with respect to the longitudinal axis (0-0) of the reinforcing strip (7) at an angle (X, Y) between 20 ° and 60 ° and that the width (L) of the approach (M) of each bridge section (14,15) on the narrow strut (12) 0.3 to 0.7 times the width (L ¹ ) of the Approach (K) on the wide strut (13) is. 3. Sealing strip according to claim 2, characterized in that that the angle (X, Y) is between 20 ° and 40 °. - 12 - 4- Sealing strip according to one of Claims 1 to 3, characterized in that the width (A) of each wide strut (13J is 1.5 to 1.7 times the width IB) of its adjacent wide contactor (22), and that the width (A *) of each narrow strut (12) is 1.9 to 2.1 faefee of the width (B ¹ ) of its adjacent narrow slot (23). 5. Sealing strip according to one of claims 1 to 4, d a - & ν. τ ch in that the widths {A *, B) of the narrow struts (12) and the wide slots (22) in 2oleranzgrenzen of - 10 ^ match. 6. Sealing strip according to buckets of claims 1 to 5 _S d a characterized in that the lugs (M) of the bridge sections (14, 15) on the narrow struts (12) in two, spaced apart in the transverse direction, parallel to the longitudinal axis ( 0-0) of the reinforcement strip (7) extending legs are arranged, which have a distance from the ends of the cross braces (12, 13).