EP1502521B1 - Telescopic slide - Google Patents

Description

The invention relates to a telescopic rail having at least one outer rail and an inner rail, the support surfaces or sliding surfaces and which are slidable in the longitudinal direction relative to each other, wherein between the outer rail and inner rail, a sliding element is provided.

Telescopic rails are known from the prior art, to which a variety of objects can be mounted linearly displaceable. Such telescopic rails are used, for example, in furniture making, household appliances, e.g. Oven pull-outs, or in the automotive industry.

Conventional telescopic rails have mutually displaceable outer and inner rails. The relative displacement of the two rails relative to each other is enhanced by the incorporation of ball bearings, i. mostly of bullets guided in ball cages, guaranteed. These significantly reduce the friction between the rails.

New applications, but also increased demands on ease of use, make it necessary to develop telescopic rails in which not only the good relative displacement of the two rails to each other in the foreground, but also the ability to decelerate the run of the rails, the rails in discrete steps or with detent positions along the extract to move against each other. Especially in the automotive industry, increasingly higher loads must be removed via the telescopic rails. An example of this is e.g. Loading area excerpts.

Conventional ball-guided telescopic rails can not meet the above requirements, since their load can be increased only by increasing the dimensions of the rails and the balls used. The incorporated in the rails ball cages with the balls contained therein take up a large part of the space between the outer and inner rail, so that only a small space for additional devices, e.g. to decelerate the displacement between the two rails is available.

For some time telescopic rails have also been used for pull-outs in ovens. The ever higher temperatures in the furnaces, eg in new pyrolysis furnaces, make a lubrication of the Ball bearings ever more difficult. It must be used fats or oils that not only withstand the high temperatures, but are also food safe.

In addition, the cleaning of the ball-guided rails is difficult and expensive, especially since dirt collects between the balls and the balls can not be removed by the user.

The installation of conventional telescopic rails is also complicated and expensive, since the rails, the balls and the ball cages must be assembled after the manufacture of items to a functional element.

From GB 879,360 a telescopic rail with two mutually longitudinally displaceable rail elements is known, in which between the outer and inner rail, a sliding element is provided, wherein the sliding element comprises sliders extending between the support and sliding surfaces of the mutually displaceable rail elements and at this concern.

The present invention is therefore based on the object of the present invention to provide a telescopic rail that solves the aforementioned problems and which allows braking or interrupting the relative movement of the rail elements against each other.

This object is achieved by a telescopic rail having at least two longitudinally displaceable rail elements, which comprise at least one outer rail, an inner rail and optionally one or more middle rails, wherein the rail elements support surfaces or sliding surfaces and wherein between each two mutually displaceably arranged rail elements at least one Sliding element is provided and the sliding element has sliding regions or sliders which extend between the support and sliding surfaces of two mutually displaceable rail elements and abut against these, wherein the sliding element has at least one locking element and a rail element has at least one device for engaging in the locking element or wherein the sliding member comprises one or more devices for decelerating the sliding longitudinal displacement between two rail members relative to each other.

The sliding element, whose sliders extend between the supporting or sliding surfaces of the rail elements, carries the load fastened to the telescopic rail over a large support surface. Thus, in comparison to conventional telescopic rails with ball bearings with the same size higher loads can be achieved. Since the sliders of the sliding element between the support and sliding surfaces of the rail elements are small compared to ball bearings with corresponding load capacities are, in the space between the outer and inner rail enough space available, so that more functional elements can be installed here. If a suitable plastic, preferably polyoxymethylene / polyacetal (POM) or polyamide, is used to produce the sliding elements, additional lubrication of the sliding surfaces can be dispensed with.

Preferably, an embodiment of the invention is used in which the support or sliding surfaces forming portions of the rail elements have a substantially U-shaped cross-section, the slider of the sliding member having a preferably the U-shaped cross section of the support or sliding surfaces forming sections adapted cross-section in that the sliders of the sliding element are connected to one another by a connecting section and the supporting or sliding surfaces of the rail elements engage around the sliders so far that the rail elements held together against a separation. This construction allows easy mounting of the rail elements or sliding elements, which are held together without further devices. In addition, the U-shaped cross section of the slider allows a very good management of the rail elements.

Conventional profiles of telescopic rails (single rail elements) have a substantially C-shaped cross-section with opposing and facing support or sliding surfaces as bent portions of an intermediate connecting portion or a "rear wall" of the C-shaped profile. In the sliding element according to the invention, the sliders are expediently connected to one another via a connecting section or back. Particularly preferably, the profile of the sliding element is adapted to the inner profile of the rail, on which the sliding element is to be fastened or fitted, with little or no play.

Particularly preferred is an embodiment of the invention in which the sliding element between two mutually displaceable rail elements is secured against displacement in the longitudinal direction relative to one of the rail elements on this. Thus, additional functional features of the telescopic rail can be realized on the attached to one of the rail elements sliding elements.

It is useful if the sliding element is fixed by clamping on one of the two rail elements. If the slider is made of a flexible material, such as e.g. made of plastic, so can the slider by compressing the slider with slight bending of the connecting portion between the sliders in the U-shaped rail "clipped". This allows for easy installation. It when the clamping forces are dimensioned so that the individual elements can be easily separated from each other is particularly advantageous. Thus, the slide can be cleaned separately from the rail elements z.B in a dishwasher.

In a preferred embodiment of the invention, the telescopic rail between two mutually displaceable rail elements a plurality of with or without spacing juxtaposed sliding elements. This makes it possible to produce telescopic rails with different overall lengths with a single length of sliding elements. Thereby, e.g. pure sliding elements are also combined with such elements having additional functional features, as described below.

Advantageously, an embodiment of the invention in which between the outer rail and the inner rail further comprises a middle rail is provided, wherein between the outer rail and middle rail and between the middle rail and inner rail in each case a sliding element is provided. Thus, a full extension can be realized with the sliding elements according to the invention, in which the telescopic rail can be extended to twice the length of your rail elements.

It may be expedient if both the sliding element and the outer and the inner rail in the longitudinal direction in each case slidable relative to each other. Thus, a full extension is formed in which the middle rail is formed by the sliding member.

Particularly preferred is an embodiment of the invention in which the sliding element is made of plastic, preferably polyoxymethylene / polyacetal (POM) or polyamide. When using plastics for the sliding element between the rail elements can be dispensed with an additional lubrication. This is particularly advantageous when the telescopic rail is to be used within a high temperature furnace.

A first embodiment of the invention is preferred in which the sliding element has at least one latching element and a rail element has at least one device for latching into the latching element. This makes it possible to decelerate the linear displacement between two rail elements at certain points and to releasably fix the two elements at these points against displacement. This is e.g. desired when in a motor vehicle, the center armrest is to be arranged in steps adjustable.

It is particularly useful if the locking element in the direction of displacement of the rail elements inlet and Abführschrägen and intervening has a recess and the device has a locking pin on the rail element to engage in the locking element. Such a locking element can be integrated directly into the sliding element and cast together with it.

It is advantageous if the sliding element has a plurality of mutually offset locking elements, so that a displacement of the two rails in discrete steps between adjacent locking positions is possible.

If it is necessary to set at certain points on the displacement particularly fixed locking positions, it may be appropriate to arrange on the sliding element two superimposed locking elements, so that the locking pin can be brought into engagement with two locking elements simultaneously. Thus, increased holding forces can be achieved.

Alternatively, the telescopic rail according to the invention may have one or more devices for decelerating the sliding longitudinal displacement of two rail elements relative to each other. Thus, a telescopic rail can be realized, the extract can be fixed in any position.

In a preferred embodiment, the device for decelerating the sliding longitudinal displacement between two rail members comprises one or more brake shoes which are resiliently movable and which can be forced apart by an eccentric so as to frictionally engage one of the rails. This construction makes it possible to actively inhibit the relative displacement of the two rails, e.g. by turning a knob attached to an eccentric or pressing a lever. The construction is also easy to implement, since all but the eccentric together with the sliding element, e.g. can be cast by injection molding.

Alternatively, the deceleration device may be a self-locking eccentric brake. This allows stepless deceleration over the available travel.

It is expedient if the Exzenterbemse has at least one rotatably mounted and biased with a spring eccentric, which is pressed against the inner surface of the inner rail, wherein the eccentric is configured so that it is driven by the inner rail or taken in reverse direction movable. The concrete design of the eccentric allows increased braking in the attempt to move the rails against each other.

In this case, an embodiment of the invention is advantageous in which the eccentric of a rotatably mounted cam against the spring force from the region of the frictional engagement with the inner rail is pivotable. Thus, the braking effect of the eccentric brake can be continuously reduced or canceled by the user of the telescopic rail to move the rail elements against each other.

It is useful if the telescopic rail has a device for braking the displacement between the inner rail and outer rail, which consists of a slide which, when it is displaced from the inner or outer rail, is spread by a fixed bolt, so that at least one of his Outer surfaces as a brake shoe with one of the rail elements is in frictional engagement and thus inhibits the relative displacement between the rails.

An embodiment of the invention is preferred in which the sliding element has devices for decelerating the sliding longitudinal displacement of the respective adjoining rail elements relative to one another when the maximum extension is reached. This prevents a rail element being pulled out of its guide at full extension and falling down.

In this case, an embodiment of the invention is advantageous in which the sliding element has at least one end stop for limiting the displacement of two rail elements in order to prevent falling out of one of the rail elements from its guide.

It is useful if the end stop has at least one chamfer and a recess located behind it for locking a rail element in the extended position. Thus, not only an end stop is formed, but also the rail element at full extension releasably secured against displacement.

The sliding element according to the invention, as described above, is also suitable for other rail or Auszugsformen.

Figur 1A

einen Querschnitt durch eine Ausführungsform der erfindungsgemäßen Teleskopschiene,

Figur 1B

einen Querschnitt durch die einzelnen Elemente der erfindungsgemäßen Teleskopschiene aus Figur 1A,

Figur 2

eine dreidimensionale Ansicht der erfindungsgemäßen Teleskopschiene von schräg oben,

Figur 3A

eine abgebrochene Seitenansicht eines erfindungsgemäßen Gleitelements mit versetzten Rastelementen,

Figur 3B

eine abgebrochene dreidimensionale Ansicht des Gleitelements aus Figur 3A von schräg oben,

Figur 4A

eine abgebrochene Seitenansicht einer alternativen Ausführungsform des erfindungsgemäßen Gleitelements mit gegenüberliegenden Rastelementen,

Figur 4B

eine abgebrochene dreidimensionale Ansicht des Gleitelements aus Figur 4A von schräg oben,

Figur 5A

eine abgebrochene Seitenansicht eines erfindungsgemäßen Gleitelements mit Exzenterbremse,

Figur 5B

eine abgebrochene dreidimensionale Ansicht des Gleitelements mit Exzenterbremse aus Figur 5A von schräg oben,

Figur 6A

eine abgebrochene Seitenansicht einer alternativen Ausführungsform des Gleitelements mit Exzenterbremse,

Figur 6B

eine abgebrochene dreidimensionale Ansicht des Gleitelements mit Exzenterbremse aus Figur 6A von schräg oben,

Figur 7A

eine abgebrochene Seitenansicht des erfindungsgemäßen Gleitelements mit einer Schieberbremse,

Figur 7B

eine abgebrochene dreidimensionale Ansicht der Schieberbremse aus Figur 7A von schräg oben,

Figur 7C

eine dreidimensionale Ansicht des Schiebers von schräg oben,

Figur 8A

eine abgebrochene Seitenansicht des erfindungsgemäßen Gleitelements mit Endanschlag,

Figur 8B

eine abgebrochene dreidimensionale Ansicht des erfindungsgemäßen Gleitelements mit Endanschlag aus Figur 8A von schräg oben,

Figur 9

eine Seitenansicht einer alternativen Ausführungsform eines erfindungsgemäßen Gleitelements mit Exzenterbremse mit Selbsthemmung und zwei Endanschlägen.

Further advantages, features and applications of the present invention will become apparent from the following description of a preferred embodiment and the accompanying figures. They show in detail:

Figure 1A

a cross section through an embodiment of the telescopic rail according to the invention,

FIG. 1B

a cross section through the individual elements of the telescopic rail according to the invention of Figure 1A,

FIG. 2

a three-dimensional view of the telescopic rail according to the invention obliquely from above,

FIG. 3A

a broken side view of a sliding element according to the invention with offset locking elements,

FIG. 3B

3 shows a broken-off three-dimensional view of the sliding element from FIG. 3A from obliquely above,

FIG. 4A

a broken side view of an alternative embodiment of the sliding element according to the invention with opposing locking elements,

FIG. 4B

a broken three-dimensional view of the sliding element of Figure 4A obliquely from above,

FIG. 5A

a broken side view of a sliding element according to the invention with eccentric brake,

FIG. 5B

a broken three-dimensional view of the sliding element with eccentric brake of Figure 5A obliquely from above,

FIG. 6A

a broken side view of an alternative embodiment of the sliding element with eccentric brake,

FIG. 6B

FIG. 6A shows a broken-off three-dimensional view of the sliding element with an eccentric brake from obliquely above,

FIG. 7A

a broken side view of the sliding element according to the invention with a slide brake,

FIG. 7B

a broken three-dimensional view of the slide brake of Figure 7A obliquely from above,

FIG. 7C

a three-dimensional view of the slide obliquely from above,

Figure 8A

a broken side view of the sliding element according to the invention with end stop,

FIG. 8B

a broken three-dimensional view of the sliding element according to the invention with end stop of Figure 8A obliquely from above,

FIG. 9

a side view of an alternative embodiment of a sliding element according to the invention with eccentric brake with self-locking and two end stops.

Figures 1A and B show a side section through the telescopic rail according to the invention. Clearly, the structure of the three elements, the outer rail 1, the slider 3 and the inner rail 2 can be seen. In the illustrated embodiment, the outer rail 1 forms the stationary rail, e.g. attached to a cabinet body. Similarly, the inner rail 2 may be the stationary rail. The sliding element 3 has two areas, which extend as a slider 7 between the support 5 and sliding surfaces 6 of the outer 1 and inner rail 2. The two sliders 7 are connected to the connecting portion or -rücken 18 with each other. The slider 3 is simply inserted by compressing the sliders 7 with slight bending of the rear wall 18 in the outer rail 1, and clamped with the sliders 7, which lie between the support surfaces 5 and sliding surfaces 6 of the outer and inner rails, in the outer rail first firmly. The projection 15 in the rear wall 18 of the sliding member 3 additionally prevents slippage of the sliding member relative to the outer rail by being in engagement with a bore in the outer rail. The inner rail 2 is now clamped in the sliding member 3 so that their sliding surfaces are supported on the sliders 7 of the sliding member 3. Clearly, the locking pin 4 can be seen on the inner rail, which can be brought into engagement with locking elements 10 on the sliding element 3. This can also be clearly seen in FIG. 3A. Here are three mutually offset locking elements 10 can be seen. These are molded directly onto the sliding element 3. In the region of the locking elements 10, the sliding member 3 is designed such that behind the locking elements, the rear wall 18 is provided with recesses 17 or recesses, so that the locking elements 10 are resiliently movable. The latching elements extend in the longitudinal direction parallel to the travel path of the inner rail. This is also particularly clear from Figures 3A and B can be seen. The locking elements 10 have inlet and Abführungsschrägen 19 and intervening a recess 14.

When moving the inner rail 2 of the locking pin 4 is guided over one of the arrival and Abführschrägen 19 up to the recess 14 where it engages in this. When guiding the locking pin 4 on the arrival and Abführschrägen 19, the locking element 10 is slightly resiliently pressed to the outside. In the embodiment shown, the locking elements are offset from each other, so that discrete locking positions result in a close successive distance and are equally suitable for rails with forward and backward.

At particularly excellent locations on the travel can, as shown in Figures 4A and B, two locking elements 10 are arranged horizontally opposite, so that when they come into engagement with the locking pin 4, this hold from two sides.

FIGS. 5A and B show the sliding element 3 of the telescopic rail, which has an eccentric brake. Before the recess 17 in the rear wall 18 of the sliding member 3, two resiliently movable brake shoes 11 can be seen, which are forced apart upon rotation of the eccentric 12 about its axis of rotation, so that they come into frictional engagement with the inner surfaces of the inner rail 2. Thus, the relative displacement between the outer rail 1 and the inner rail 2 is braked and stopped. The eccentric 12 is driven for example via the part-circular gear portion 9.

Figures 6A and B show an eccentric brake with self-locking. The brake is attached to the sliding element 3 and has two rotatably mounted on bolts 29, 30 and prestressed with springs 31, 32 eccentric 27, 28, whose lateral surfaces are pressed against the inner surface of the inner rail 2. The shape of the eccentric 27, 28 is designed so that its outer radius increases counter to the direction of movement of the inner rail 2. Is the eccentric 27, 28 with the inner rail 2 in frictional engagement and the inner rail 2 is moved, the eccentric 27, 28 is pivoted about the pin 29 and 30 and areas of the eccentric 27, 28 with larger outer radius come with the inner rail. 2 in frictional engagement. However, the greater the outer radius of the portion of the eccentric 27, 28 engaging with the inner rail 2, the greater the clamping effect. Consequently, the braking effect is automatically increased when moving the inner rail.

The two eccentrics 27, 28 are, as can be seen from FIGS. 6 A) and B), arranged in opposite directions and point-symmetrically on the sliding element 3. Thus, in both possible directions of displacement of the inner rail 2, the braking effect when moving increases. In the illustrated embodiment, the first eccentric 27 is in frictional engagement with the upper slider 7 and the second eccentric with the lower slider 7. Between the two eccentrics 27, 28 a rotatably mounted cam 33 is arranged. This can be rotated about a cross through the slider 3 and the outer rail 1 axis. In this case, the cam 33 presses against the spring force on the ends of the eccentric 27, 28, so that they are pivoted and the braking force is reduced or eliminated.

In FIGS. 7A and B, the so-called slide brake for braking the sliding movement between the inner and outer rails 1 is shown. The slide 13 can clearly be seen in FIG. 7A. The slider 13 has two brake shoes 11. On the slider 13, a slide lever 23 is fixed, which engages through a slot 34 in the slider 3 and the outer rail 1. This slide lever 23 can be actuated to move the slider 13 in the direction of the extension. Alternatively, the slider 13 of the inner rail 2 in its displacement be taken, for example, by an inwardly projecting projection or a bolt, so that it moves relative to the sliding member 3 and the stationary bolt 20 fixed thereto. The slider 13 can then serve as a braked end stop. The bolt 20 engages in the slot 21 within the slider 13 and presses due to the decreasing width of the elongated hole when moving the slider 13, the brake shoes 11, which are formed by the outer surfaces of the slider 13, apart. The brake shoes 11 come into frictional engagement with the inner surfaces of the inner rail 2. The displacement of the inner rail 2 is braked gently relative to the outer rail 1. Due to the shape of the elongated hole 21, the bolt 20 fastened to the sliding element 3 engages in the end position of the slot 21. Thus, the braking effect is maintained even after releasing the slide lever 23. Only by moving the slider 13 in the opposite direction, the braking effect of the slider 13 is canceled.

It can also clearly be seen in FIG. 7B that the sliding element is secured against displacement relative to the outer rail 1 with the aid of the bolt 21, which is fastened to the outer rail 1 and engages in the hole or recess 22 of the sliding element.

In Figures 8A and B, an alternative end stop with a stop function is shown. In the region of the end of the sliding element 3, a pincer-shaped end stop 23 can be seen, whose resilient chamfers are arranged in front of the recess 17 in the rear wall 18 of the sliding element 3. Upon reaching the end stop now pushes a bolt 4, which is fixed to the inner rail 2, the Anführungsschrägen 19 of the end stop 23 apart and locked into the recess 26 lying behind the chamfers 19 26 of the end stop.

FIG. 9 schematically shows the modular construction of the sliding element 3 from individual sections 8, 24 and 25. Section 8 is a pure sliding element without additional functions. It will be made in various lengths or it will be composed of various shorter basic elements so that different overall lengths of the sliding element 3 are achieved. The sections 24 form two end stops, as shown in Figures 8A and B. The additional portion 25 provides the slider with a brake function. Instead of the pure sliding element 8, a sliding element with locking elements could also be used in order to be able to set up discrete locking positions between the end stops. The modular design makes it possible to realize with prefabricated, simple basic elements telescopic rails, which have different functional characteristics depending on the requirement profile.

Claims (20)

1. Telescopic rail with at least two rail elements (1,2) displaceable against each other in longitudinal direction, which comprise at least one outer rail (1), one inner rail (2) and optionally one or more middle rails, in which the rail elements have supporting surfaces (5) or sliding surfaces (6) and in which in each case between two rail elements arranged displaceably against each other, at least one slide element (3) is provided wherein the slide element (3) has slides (7) which extend between the supporting surfaces (5) and sliding surfaces (6) of two rail elements displaceable against each other and are in contact with the latter, characterized in that the slide element (3) has at least one locking element (10) and a rail element (1, 2) has at least one device for locking into the locking element (10) or in that the slide element (3) has one or more devices for braking the sliding longitudinal movement between two rail elements relative to each other.
2. Telescopic rail according to claim 1, characterized in that the sections of the rail elements (1, 2) forming the supporting (5) or sliding surfaces (6) have an essentially U-shaped cross-section, the slides (7) of the slide element (3) have a cross-section preferably adapted to the U-shaped cross-section of the sections forming the supporting or sliding surfaces, the slides (7) of the slide element (3) are connected with each other with a connection section (18) and the supporting (5) or sliding surfaces (6) of the rail elements (1, 2) grip the slides to the extent that the rail elements (1, 2) are held together and prevented from separating.
3. Telescopic rail according to claim 1 or 2, characterized in that the slide element (3) between two rail elements displaceable opposite each other is fixed to one of the rail elements against displacement in longitudinal direction relative thereto.
4. Telescopic rail according to claim 3, characterized in that the slide element (3) is secured by clamping to one of the two adjacent rail elements.
5. Telescopic rail according to one of claims 1 to 4, characterized in that the telescopic rail has, between two rail elements (1, 2) displaceable against each other, several slide elements (3) arranged side by side with or without some distance from each other.
6. Telescopic rail according to one of claims 1 to 5, characterized in that, between the outer rail (1) and the inner rail (2) a middle rail is additionally provided, at least one slide element (3) being provided between outer rail (1) and middle rail and between middle rail and inner rail (2) in each case.
7. Telescopic rail according to claim 1 or 2, characterized in that the slide element (3), the outer rail (1) and the inner rail (2) are displaceable sliding relative to each other in longitudinal direction.
8. Telescopic rail according to one of claims 1 to 7, characterized in that the slide element (3) is produced from plastic, preferably polyoxymethylene/polyacetal (POM) or polyamide.
9. Telescopic rail according to one of claims 1 to 8, characterized in that the locking element (10) in the direction of the displacement of the rail elements has lead-in and lead-off inclines (19), and a recess (14) in between, and the device on the rail element (1, 2) is a locking pin (4) for locking into the locking element.
10. Telescopic rail according to claim 9, characterized in that the slide element (3) has several locking elements (10) offset relative to one another.
11. Telescopic rail according to claim 9 or 10, characterized in that the slide element (3) has at least two locking elements (10), which are arranged opposite each other, so that the locking pin (4) can simultaneously be engaged with the recesses in both locking elements (10).
12. Telescopic rail according to one of claims 1 to 9, characterized in that the device for braking comprises one or more brake shoes (11) which are elastically mobile and which can be spread apart by an eccentric (12), with the result that they can be brought into friction contact with one of the rails.
13. Telescopic rail according to one of claims 1 to 9, characterized in that the device for braking comprises an eccentric self-locking brake.
14. Telescopic rail according to claim 13, characterized in that the eccentric brake has at least one rotatably supported eccentric (27, 28) pre-tensioned with a spring (31, 32), which is pushed against the inner surface of the inner rail (2), the eccentric being designed such that it is movably driven by the inner rail (2) in the locking direction.
15. Telescopic rail according to claim 14, characterized in that the at least one eccentric (27, 28) can be rotated by a rotatably supported cam (33) against the spring tension out of the region of the friction engagement with the inner rail (2).
16. Telescopic rail according to one of claims 1 to 15, characterized in that the slide element (3) has a slide (13) which is displaceable opposite the slide element (3) and at least one outer surface of which is designed as a brake shoe (11), said brake shoe (11) being elastically mobile, spreadable and capable of being brought into friction contact with one of the rail elements.
17. Telescopic rail according to one of claims 1 to 16, characterized in that the slide element (3) has devices for braking the sliding longitudinal displacement of the adjacent rail elements moving relative to each other in each case when maximum extension is reached.
18. Telescopic rail according to one of claims 1 to 17, characterized in that the slide element has at least one end stop for limiting the displacement of two rail elements against each other.
19. Telescopic rail according to claim 18, characterized in that the end stop has at least one lead-in incline and a recess for locking a rail element (1, 2) in the extended position.
20. Slide element for a telescopic rail, as defined in one of claims 1 to 19.

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