EP3555400B1 - Rail slider for a cable-type window lifter of a motor vehicle - Google Patents

Description

The invention relates to a rail slider for a cable window regulator of a motor vehicle according to the preamble of claim 1, which is made of plastic and can be brought into engagement with an associated assembly opening near the lower edge of the window pane via a latching hook arranged on a leg or bracket.

Rail sliders of this type have a base body which is designed in such a way that it at least partially encompasses the guide rail of the cable window lifter in order to be slidably mounted on it and to guide the window pane between its upper and lower stop position. Legs of the rail slider are connected to the base body and form a receiving gap for the window pane, with the latching hook being formed on a leg which can be elastically deformed transversely to the pane surface.

The design principle described above is, for example, from EP 0 208 237 B1 known. Although it enables a simple and inexpensive connection to be produced between the window pane and the rail slider, the single leg carrying the latching hook has only a very limited mechanical load-bearing capacity. In the event of higher pull-off forces, which occur in particular when loosening panes frozen to a door frame, this occasionally leads to the connection between pane and rail slider becoming loose.

Out of DE 10 2012 223 825 A1 an improved rail slider is known, which has a cross-connection element between two lateral elastic webs, which carries a latching hook in the middle. Although this construction is much more robust, high mechanical loads can lead to twisting of the lateral webs connected to the base of the rail slider, which promotes a twisting movement of the latching hook out of the disc hole.

DE 4423440 A1 shows a rail slider which--in kinematic reversal to the constructions described above--has a latching element arranged in a pane hole and associated latching openings in the legs, which form a gap for receiving the window pane. Here, the two laterally arranged legs, which carry the cross-connection element are kept extremely short and therefore very rigid. Instead, the cutout extending below the cross-connection element and connected to the latching opening forms a pivot axis for the cross-connection element in order to be able to ensure pivoting of the cross-connection element for the purpose of latching in the latching element mounted on the pane. When a so-called pull-off force is applied, the pivotable cross-connection element is supported on the window pane. The mechanical load-bearing capacity of the rail slider is not (primarily) determined by the elasticity of lateral webs, but rather by the tensile strength of the material connecting the cross-connection element to the legs, which forms the pivot axis of the cross-connection element. Although the mechanical resilience of this design variant is comparatively good, not least because of the distribution of the pull-off forces over two legs on both sides of the window pane, the pre-assembly of the locking element in the pane hole requires significant additional effort. In addition, there are increased requirements when inserting the window pane equipped with the locking element into the narrow slot of the door shaft.

the DE 10 2014 204 361 A1 discloses a method for producing a driver, wherein the driver is produced with at least two bodies in a multi-component injection molding process. In the production of the driver in the multi-component injection molding process, a first body made of a lower-melting material is injected in front of a second body made of a higher-melting material, the second body made of the higher-melting material being injected onto the first body made of the lower-melting material becomes.

The invention is therefore based on the object of further developing the structural design of a foldable plastic rail slider in such a way that its mechanical strength is improved without significantly impairing its mountability at the expense of the necessary flexibility of the lateral limbs. Here, the contradiction has to be resolved that a high degree of flexibility would be advantageous for easy and simple mounting of the rail slider on the window pane, while the transmission of large pull-off forces requires a high level of rigidity of the rail slider.

This object is achieved by a rail slider having the features of claim 1, wherein the characterizing features describe the geometric relationships according to the invention between different sections of the rail slider.

• ∘ mit einem Grundkörper mit Führungsflächen für die Führungsschiene des Seilfensterhebers und
• ∘ mit einem über eine Basis mit dem Grundkörper federelastisch angebundenen Haltebügel mit einem am oberen Ende angeordneten Rasthaken, wobei der Haltebügel zwei seitliche Stege, die an der Basis angebunden sind, und ein Querverbindungselement, das den Rasthaken trägt, aufweist, liegt der Kern der Erfindung darin,
• ∘ dass das Verhältnis der lichten Weite zwischen den inneren Flächen der seitlichen Stege des Haltebügels und des Abstandes zwischen der Anschlagsfläche der Unterkante der Fensterscheibe einerseits und der Anschlagsfläche des Rasthakens andererseits höchstens den Wert 1,2 annimmt, vorzugsweise höchstens den Wert 1,0, und/oder
• ∘ dass das Verhältnis der lichten Weite zwischen den inneren Flächen der seitlichen Stege des Haltebügels und der Hebellänge zwischen der basisseitigen virtuellen Schwenkachse des Haltebügels einerseits und der Anschlagsfläche des Rasthakens andererseits höchstens den Wert Z2a/Z3a ≤ 0,5 annimmt, und
• ∘ dass das Querverbindungselement des Haltebügels im Wesentlichen bogenförmig ausgebildet ist, zumindest auf der Innenseite des Querverbindungselements.

Starting from a rail glider

• ∘ with a base body with guide surfaces for the guide rail of the cable window regulator and
• The core of the invention lies with a retaining clip, which is elastically connected to the main body via a base and has a latching hook arranged at the upper end, the retaining clip having two lateral webs which are connected to the base and a cross-connection element which carries the latching hook in this,
• ∘ that the ratio of the clear width between the inner surfaces of the side bars of the retaining bracket and the distance between the contact surface of the lower edge of the window pane on the one hand and the contact surface of the locking hook on the other hand has a maximum value of 1.2, preferably a maximum value of 1.0, and /or
• ∘ that the ratio of the clear width between the inner surfaces of the lateral webs of the holding bracket and the lever length between the base-side virtual swivel axis of the holding bracket on the one hand and the stop surface of the locking hook on the other hand has a maximum value of Z2a/Z3a ≤ 0.5, and
• ∘ that the cross-connection element of the headband is essentially arc-shaped, at least on the inside of the cross-connection element.

This includes

• ∘ the contour of the inward arc of the cross-connection element no straight segments longer than 0.3 times, preferably no longer than 0.2 times the width of the lateral webs, and preferably
• ∘ the contour of the outward arc of the cross-connection element also no straight segments longer than 0.2 times, preferably no longer than 0.1 times the width measured across the outer surfaces of the webs.

The base-side virtual pivot axis of the holding bracket is to be understood as an axis that results from an elastic deformation of the lateral webs in the area of the connection of these webs to the base of the rail slider. The virtual pivoting axis therefore does not represent an axis to be precisely located; but their location must logically be limited to the cross-section of the base.

A rail slider with the above-described geometric proportions according to the invention ensures on the one hand the elasticity required for good assembly and on the other hand increased mechanical strength, in particular being able to transmit an increased pull-off force, while at the same time the necessary use of materials can be reduced. The proportions and contours of the invention allow a harmonious flow of forces from the locking element in the upper area of the arched bracket, via the lateral bars to the base connected to the main body, to which the bars are articulated. These geometric proportions also counteract any twisting of the lateral webs and thus a swinging out of the latching hook under load. It has thus been possible to significantly improve the load-bearing capacity of the rail slider according to the invention without appreciably restricting the elastic properties necessary for good assembly.

According to a preferred variant of the invention, a socket connected to the base is arranged within the clear width of the holding bracket (distance between the inner edges of the lateral webs), which forms a stop surface facing away from the base for the lower edge of the window pane. This design feature allows the stiffening ribs running along the lateral webs to be continuously deflected in the area of the underlying base and thus run into the base. As a result, the flow of force is diverted or introduced in a targeted manner and undesirable bending effects in the lateral webs are counteracted. The width of the plinth connected to the base should be no more than half the width measured across the outer faces of the side ridges.

According to a preferred variant of the invention, the clear width between the outward-facing surfaces of the base and the associated inward-facing surfaces of the lateral webs is at most half the width of the lateral webs. In this way, a compact design is realized while at the same time increasing the load-bearing capacity of the elastic headband.

The arcuate design of the cross-connection element bridging the lateral webs should ideally essentially correspond to the shape of a parabola or another exponential mathematical function with its inner and/or outer contours. The tangents at the ends of the contour sections in question, which map an exponential function, run essentially orthogonally to one another. Or to put it another way: one tangent at one end of the arcuate contour runs essentially orthogonally to the direction of displacement and the other tangent at the other end of the arcuate contour runs essentially parallel to the direction of displacement.

This results in an ideal deflection of the vertical (i.e. downward-pointing) pull-off force, which must be absorbed by the locking hook, into the lateral webs of the bracket guaranteed. This minimizes the tendency for the load-bearing parts to twist and bend undesirably.

At this point it should be pointed out that comparably good results can also be achieved if the continuous contour progression according to an exponential function is completely or partially replaced by a so-called polygon course, in which the contour sections are composed completely or partly of a large number of straight sections. The angles between adjacent sections of the polygon should be no less than 75 degrees, preferably no less than 80 degrees.

The side walls of the lateral webs are typically designed as stiffening ribs. According to the invention, these stiffening ribs merge into horizontally running stiffening ribs in the area of the base. The outer stiffening ribs are connected to one another, while the inner stiffening ribs of the webs merge or are deflected into stiffening ribs of the inner base. In addition, a stiffening rib arranged between the side walls of the webs is used, which is also deflected into a horizontally running stiffening rib in the area of the base and finally runs into a central area of the base in the direction of the stop for the lower edge of the pane.

The stiffening ribs of the lateral webs described are connected by a plurality of transverse ribs which are at an angle of 70-90 degrees on the connection surfaces of the stiffening ribs. The density of the transverse ribs is significantly higher in the area of the arched cross-connecting element (21a), in particular more than twice as high as in the area of a web running straight (in the pull-off direction). As a result, the mechanical load-bearing capacity of the cross-connection element is strengthened and the elasticity required for simple blind assembly of the rail slider is not unnecessarily restricted.

Figur 1a

Draufsicht auf einen erfindungsgemäßen Schienengleiter vonseiten des elastischen Bügels;

Figur 1b

Seitenansicht des erfindungsgemäßen Schienengleiters;

Figur 1c

Perspektivische Darstellung des erfindungsgemäßen Schienengleiters;

Figur 2a

Draufsicht auf einen vorbekannten Schienengleiter vonseiten des elastischen Bügels;

Figur 2b

Seitenansicht des vorbekannten Schienengleiters;

Figur 3a

Schematische Darstellung eines erfindungsgemäßen elastischen Bügels mit bogenförmigen Querverbindungselement;

Figur 3b

Schematische Darstellung eines bekannten elastischen Bügels mit im Wesentlichen geradem Querverbindungselement;

Figur 4a

Schematische Darstellung eines erfindungsgemäßen elastischen Bügels mit bogenförmigen Querverbindungselement und zusätzlichen Versteifungsrippen zwischen den seitlichen Versteifungsrippen des Bügels;

Figur 4b

Schematische Darstellung eines bekannten elastischen Bügels mit im Wesentlichen geradem Querverbindungselement.

The invention is explained in more detail below using an exemplary embodiment and the associated figures. Show it:

Figure 1a

Top view of a rail slider according to the invention from the side of the elastic bracket;

Figure 1b

Side view of the rail slider according to the invention;

Figure 1c

Perspective view of the rail slider according to the invention;

Figure 2a

Top view of a previously known rail slider from the side of the elastic bracket;

Figure 2b

Side view of the previously known rail slider;

Figure 3a

Schematic representation of an elastic bracket according to the invention with an arc-shaped cross-connection element;

Figure 3b

Schematic representation of a known elastic hanger with a substantially straight cross-connection element;

Figure 4a

Schematic representation of an elastic bracket according to the invention with arc-shaped cross-connection element and additional stiffening ribs between the lateral stiffening ribs of the bracket;

Figure 4b

Schematic representation of a known elastic stirrup with a substantially straight transverse connection element.

In the Figures 1a - 1c are shown different views of the rail slider according to the invention. Schematic representations of the details of the invention show the figures 3a and 4a . In order to understand the following detailed description of the invention, it will regularly be necessary to consult these figures together, since the large number of reference symbols could not be combined in a single figure.

The same applies to the description of the prior art in various views in the Figures 2a, 2b , 3b and 4b is shown. The detailed comparison of an embodiment according to the invention and an example selected from the prior art is intended to help make the core of the invention understandable.

the Figures 1a - 1c show a rail slider with a base body 1a which has guide slots for engaging a guide rail (both not shown) in order to slide the rail slider with a window pane F mounted thereon along a predetermined path. The window pane F is stored in a gap 112a, which is limited on the one hand by a leg 100a formed on the base body 1a and on the other hand by the retaining bracket 2a, which consists of the two lateral webs 20a and the arcuate cross-connecting element 12a. The holding bracket 2a is connected to a base 10a via the lower areas of the lateral webs 20a. This base 10a is the lowest-lying part of the base body 1a, to which the base 11a is also connected, the upper end of which forms a stop 110a for the lower edge F1 of the window pane F.

The arcuate cross-connection element 21a is pressed against the associated surface of the window pane F via the spring-elastic lateral webs 20a, with the locking hook 210a formed on the cross-connection element 21a also being held in engagement with the assembly opening (not shown) in the window pane F. In order to connect the window pane F to the rail slider, the window pane F is pressed with its lower edge F1 onto the inclined insertion wedge surface 2100a, with the pane F, supported on the leg 100a, pressing the elastically deformable lateral webs 20a outwards until the latching hook 210a rests on the surface of the disc F. When the assembly opening in the window pane F is reached, the latching hook 210a engages.

• Das Verhältnis der lichten Weite Z2a zwischen den inneren Flächen der seitlichen Stege 20a des Haltebügels 2a und des Abstandes Z1a zwischen der Anschlagsfläche 110a der unteren Kante F1 der Fensterscheibe F einerseits und der Anschlagsfläche 210'a des Rasthakens 210a andererseits soll höchstens den Wert Z2a/Z1a ≤ 1,2 annehmen; vorzugsweise ist dieser Wert kleiner als 1,0.
• Gemäß dem gewählten Ausführungsbeispiel nimmt das Verhältnis zwischen der lichten Weite Z2a zwischen den inneren Flächen der seitlichen Stege 20a des Haltebügels 2a und der Hebellänge Z3a der basisseitigen virtuellen Schwenkachse S4 des Haltebügels 2a einerseits und der Anschlagsfläche 210'a des Rasthakens 210a andererseits höchstens den Wert Z2a/Z3a ≤ 0,5 an. Diese Relation kann aber auch alternativ zur voranstehenden Relation Z2a/Z1a zur Anwendung kommen.

In order to achieve the object of the invention, namely to increase the mechanical load-bearing capacity while maintaining good assembly capability while at the same time reducing the material requirement, the following geometric relationships must be observed:

• The ratio of the clear width Z2a between the inner surfaces of the lateral webs 20a of the retaining bracket 2a and the distance Z1a between the stop surface 110a of the lower edge F1 of the window pane F on the one hand and the stop surface 210'a of the latching hook 210a on the other hand should not exceed the value Z2a/Z1a assume ≤ 1.2; preferably this value is less than 1.0.
• According to the selected exemplary embodiment, the ratio between the clear width Z2a between the inner surfaces of the lateral webs 20a of the retaining bracket 2a and the lever length Z3a of the base-side virtual pivot axis S4 of the retaining bracket 2a on the one hand and the stop surface 210'a of the latching hook 210a on the other hand has a maximum value of Z2a /Z3a ≤ 0.5 on. However, this relation can also be used as an alternative to the above relation Z2a/Z1a.

The base-side virtual pivot axis S4 of the retaining bracket 2a is not understood to mean an axis to be precisely located, but an axis that results from an elastic deformation of the lateral webs 20a in the area of the connection of these webs 20a to the base 10a of the rail slider.

• ∘ der nach außen weisende und durch die Radien R1a, R2a, R3a zusammengesetzte Bogen keine geraden Segmente L1 aufweist, die länger als das 0,2-fache der über die äußeren Flächen der Stege 20a gemessen Breite Ba sind (also: L1/Ba ≤ 0,2); vorzugsweise ist dieser Wert kleiner als 0,1; und
• ∘ der nach innen weisende, durch die Radien r1a, r2a, r3a zusammengesetzte Bogen keine geraden Segmente L2 aufweist, die länger als das 0,3-fache der Breite b1a der seitlichen Stege 20a sind (L2/b1a ≤ 0,3); vorzugsweise ist der Wert L2/b1a kleiner als 0,2.

The cross-connection element 21a of the headband 2a is essentially arc-shaped in such a way that

• ∘ The arc pointing outwards and composed by the radii R1a, R2a, R3a has no straight segments L1 that are longer than 0.2 times the width Ba measured over the outer surfaces of the webs 20a (i.e.: L1/Ba ≤ 0.2); preferably this value is less than 0.1; and
• ∘ the inward arc composed by the radii r1a, r2a, r3a does not have straight segments L2 longer than 0.3 times the width b1a of the lateral webs 20a (L2/b1a ≤ 0.3); preferably the value L2/b1a is less than 0.2.

See also the schematic representations of figures 3a and 4a .

Comparing the above-described geometric proportions according to the invention with the corresponding proportions of the prior art belonging to the rail slider according to the figures 2a , 3b and 4b , one finds that there are significant qualitative and quantitative differences. Since the reference numerals in strict analogy to those used for the description of Figures 1a - 1c , 3a and 4a reference numerals used have been chosen, a repetitive explanation of the general structure of the embodiment of the prior art can be omitted. The suffix "a" always refers to the invention and the suffix "b" stands for references to the prior art embodiment. So only the essential differences will be discussed.

From the schematic representations of figures 3b and 4b In relation to the prior art, it is easy to see that the cross-connection element 21b bridging the lateral webs 20b is dominated by straight sections L1, L2. Only the edge-side transition areas to the lateral webs 20b are equipped with curved contours. When a load acts on the latching hook 210b, this not only leads to a pivoting movement of the cross-connection element 21b about the virtual axis S2 due to the prevailing lever conditions. With the given dimensioning, this also promotes twisting of the elastically designed lateral webs 20b (indicated by the virtual twisting axis S3), as a result of which the tendency for the cross-connection element 21b to swivel or swivel out is further increased. As a result, the risk of the latch hook 210b slipping out of the mounting hole of the window glass increases.

However, the entry and transmission of forces within the rail slider is also affected by the unfavorable ratios of the straight lengths 20ba, 20bi of the outer and inner sections of the lateral webs 20b compared to the heights 21ba, 21bi of the outer and inner arcuate sections of the cross-connection element 21b affected. The ratio here (i.e. in the prior art) is on the order of approx. 20b/21b=5...8. In the embodiment according to the invention, these ratios are in the range of only 2...3 because of the pronounced arcuate contour.

For a material and space-saving, but at the same time good load-bearing construction of the rail slider, the width b3a of the base 11a connected to the base 10a should be at most half as large as the width Ba measured over the outer surfaces of the webs 20a. At the same time, the clear width b2a between the outward-pointing surface of the base 11a and the inward-pointing surface of the associated web 20a on the one hand and the width b1a of the webs 20a should have a maximum value of 0.5. Sufficient space remains to form the abutment surface 110a for the lower edge F1 of the window pane F on the base 11a.

As already explained, it is particularly important for the performance of the invention that the cross-connection element 21a is designed as an arcuate structure, with at least the inner contour between the latching hook 210a and the essentially straight regions of the lateral webs 20a (i.e. in the region of the radii r1a, r2a , r3a) is arcuate. The arcuate inner and/or outer contours of the cross-connection element 21a are preferably essentially parabolic or correspond to the course of another exponential mathematical function, the tangents at the ends of the relevant contour sections being essentially orthogonal to one another. Ultimately, this means that one tangent at one end of the arcuate contour (i.e. in the area of the latching hook 210a) is essentially orthogonal to the direction of displacement and the other tangent at the other end of the arcuate contour (i.e. at the transition to the straight area of the lateral web 20a) in the Substantially parallel to the direction of displacement. This results in a continuous flow of force without force peaks down to the base 10a.

As a variant of the invention, the contour sections r1a, r2a, r3a or R1a, R2a, R3a are composed entirely or partially of polygonal sections, with the angles between adjacent sections of the polygon being no less than 75 degrees, preferably no less than 80 degrees.

Typically, the side walls of the webs 20a are designed as stiffening ribs 201a, 202a, which form a U-shaped cross section of the web 20a via a common connecting side wall. These stiffening ribs 201a, 202a change their direction in the area of the base 10a and finally run horizontally into the stiffening ribs 2010a, 2020a. Thus, the outer stiffening ribs 202a running to the lower edge of the rail slider unite to form a common stiffening rib 2020a on the base 10a, while the inner stiffening ribs run over the stiffening ribs 2030a on the base into ascending stiffening ribs 111a of the base 11a.

To further improve the mechanical load-bearing capacity, at least one additional stiffening rib 203a can be arranged between the edge-side stiffening ribs 201a, 202a of the webs 20a, with this stiffening rib 203a also being deflected into a horizontally running stiffening rib (2030a) in the region of the base 10a.

A plurality of transverse ribs 22a are provided for further stabilization of the arcuate transverse connection element 21a carrying the latching hook 210a, so that the stiffening ribs 201a, 202a, 203a of the webs 20a are connected in a net-like manner by the transverse ribs 22a. The transverse ribs 22a should be at an angle of 70-90 degrees on the connecting surfaces of the stiffening ribs 201a, 202a, 203a. The density of the transverse ribs 22a in the area of the curved cross-connection element 21a is significantly higher than in the straight area of the webs 20a, in particular the density is more than twice as high.

Reference List

1a, 1b

body

10a, 10b

Base

11a, 11b

base

12a, 12b

recess

100a, 100b

leg (on the side of the body)

110a, 110b

Stop for the lower edge of the window pane

111a, 111b

Reinforcement rib on the base

112a, 112b

Gap for disc recording

2a, 2b

mounting bracket

20a, 20b

Lateral webs

20aa, 20ba

Length of the straight, vertical outer portion of the leg

20ai, 20bi

Length of the straight vertical inner portion of the leg

21a, 21b

cross connector

21aa, 21ba

Height of the outer arcuate section of the transverse connector

21ai, 21bi

Elevation of the inner arcuate section of the transverse connector

22a, 22b

cross ribs

201a, 201b

stiffening rib

202a, 202b

stiffening rib

203a

stiffening rib

210a, 210b

latch hook

210'a, 210'b

Outline of the snap hook

2010a, 2010b

Short stiffening rib, base side

2020a, 2020b

Central stiffening rib, base side

2030a

Long stiffening rib, base side

2100a, 2100b

lead-in wedge surface

ba, bb

outer width

b1a, b1b

Width of the side bars

b2a, b2b

Clear width between webs and base

b3a, b3b

width of the base

f

windowpane

F1

Lower edge of the window pane

L1

Length of a straight section on the outer contour

L2

Length of a straight section on inner contour

R1a, R1b

Radius of a section on the outer contour

R2a

Radius of a section on the outer contour

R3a

Radius of a section on the outer contour

r1a, r1b

Radius of a section on inner contour

r2a

Radius of a section on inner contour

r3a

Radius of a section on inner contour

S1

Pseudo swivel axis

S2

Virtual swivel axis, locking hook side

S3

Virtual torsion axis

S4

Virtual swivel axis, base side

Z1a, Z1b

distance between stop surfaces

Z2a, Z2b

clearance between the inner surfaces

Z3a, Z3b

lever arm length

Claims (13)

1. Rail slider for a cable window lifter of a motor vehicle with

   - a base body (1a) designed to be displaced along a guide rail of the cable window lifter in engagement with said guide rail,

   - a retaining bracket (2a), which is spring-elastically connected to the base body (1a) via a base (10a) and has a latching hook (210a) at its upper end, the latching hook (210a) being provided to engage in an existing latching opening in the window pane (F) and to be supported with an abutment surface (210'a) against the contour of the latching opening,

   - wherein the retaining bracket (2a) has two lateral webs (20a) and a transverse connecting element (21a) with the latching hook (210a), wherein the lateral webs (20a) of the retaining bracket (2a) are connected to the base (10a) of the base body,

   - wherein a base (11a) connected to the base (10a) is arranged within a clear width (Z2a) of the retaining bracket (2a), which base forms an abutment surface (110a) facing away from the base (10a) for a lower edge (F1) of the window pane (F),

   - wherein the ratio of the clear width (Z2a) between the inner surfaces of the lateral webs (20a) of the retaining bracket (2a) and the distance (Z1a) between the abutment surface (110a) of the lower edge (F1) of the window pane (F) on the one hand and the abutment surface (210'a) of the latching hook (210a) on the other hand assumes at most the value 1.2, and/or

   - wherein the ratio of the clear width (Z2a) between the inner surfaces of the lateral webs (20a) of the retaining bracket (2a) and the lever length (Z3a) between a base-side virtual pivot axis (S4) of the retaining bracket (2a), which results from an elastic deformation of the lateral webs (20a) in the region of the connection of said webs (20a) to the base (10a), on the one hand, and the abutment surface (210'a) of the latching hook (210a) on the other hand, assumes at most the value 0.5,
   characterized in
   that the transverse connecting element (21a) of the retaining bracket (2a) is substantially arc-shaped, such that an inwardly pointing arc composed by radii (r1a, r2a, r3a) has no straight segments (L2), which are longer than 0.3 times the width (b1a) of the lateral webs (20a).
2. Rail slider according to claim 1, characterized in that the relations related to the retaining bracket (2a) assume the following values:

   - the ratio of the clear width (Z2a) between the inner surfaces of the lateral webs (20a) of the retaining bracket (2a) and the distance (Z1a) between the abutment surface (110a) of the lower edge (F1) of the window pane (F) on the one hand and the abutment surface (210'a) of the latching hook (210a) on the other hand assumes at most the value 1.0,

   - the ratio of the clear width (Z2a) between the inner surfaces of the lateral webs (20a) of the retaining bracket (2a) and the lever length (Z3a) between a base-side virtual pivot axis (S4) of the retaining bracket (2a) on the one hand and the abutment surface (210'a) of the latching hook (210a) on the other hand assumes at most the value 0.4, and

   - the ratio of the straight segments (L2) on the one hand and the width (b1a) of the lateral webs (20a) on the other hand assumes at most the value 0.3.
3. Rail slider according to claim 1, characterized in that the transverse connecting element (21a) of the retaining bracket (2a) is substantially arc-shaped such that an outwardly facing arc composed by radii (R1a, R2a, R3a) has no straight segments (L1) longer than 0.2 times, preferably 0.1 times, the width (Ba) measured across the outer surfaces of the webs (20a).
4. Rail slider according to at least one of the preceding claims, characterized in that the width (b3a) of the base (11a) connected to the base (10a) and forming the abutment surface (110a) for the lower edge (F1) of the window pane (F) is at most half the width (Ba) measured over the outer surfaces of the webs (20a).
5. Rail slider according to at least one of the preceding claims, characterized in that the clear width (b2a) between the outwardly facing surface of the base (11a) and the inwardly facing surface of the associated web (20a), on the one hand, and the width (b1a) of the webs (20a), on the other hand, assumes at most the value 0.5.
6. Rail slider according to at least one of the preceding claims, characterized in that the arc-shaped inner and/or outer contours of the transverse connecting element (21a) substantially correspond to a parabola or other exponential mathematical function, the tangents at the ends of the respective contour sections being substantially orthogonal to each other.
7. Rail slider according to claim 6, characterized in that the contour sections are wholly or partly composed of polygonal sections, the angles between adjacent sections of the polygon being not less than 75 degrees, preferably not less than 80 degrees.
8. Rail slider of claim 6, characterized in that one tangent at one end of the arc-shaped contour is substantially orthogonal to the direction of displacement and the other tangent at the other end of the arc-shaped contour is substantially parallel to the direction of displacement.
9. Rail slider according to at least one of the preceding claims, characterized in that the side walls of the webs (20a) are formed as reinforcement ribs (201a, 202a), which are connected to each other via reinforcement ribs (2010a, 2020a) of the base (10a).
10. Rail slider according to claim 9, characterized in that at least one further reinforcement rib (203a) is additionally arranged between the edge-side reinforcement ribs (201a, 202a) of the webs (20a), this reinforcement rib (203a) being deflected in the region of the base (10a) into a horizontally extending reinforcement rib (2030a).
11. Rail slider according to claims 9 and 10, characterized in that the edge reinforcement ribs (2010a, 2020a) merge over the base (10a) and the inner reinforcement ribs (2030a) merge into an ascending reinforcement rib (111a) of the base (11a).
12. Rail slider according to at least one of claims 9 to 11, characterized in that the reinforcement ribs (201a, 202a, 203a) of the webs (20a) are connected by a plurality of transverse ribs (22a), which are at an angle of 70-90 degrees on the connecting surfaces of the reinforcement ribs (201a, 202a, 203a).
13. Rail slider according to claim 12, characterized in that the density of the transverse ribs (22a) in the region of the arc-shaped transverse connecting element (21a) is significantly higher, in particular more than twice as high, as in the straight region of the webs (20a).

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