DE1265589B - Flexible boundary apron for gas cushion vehicles - Google Patents

Description

Flexible boundary apron for gas cushion vehicles The invention relates to a flexible boundary apron for gas cushion vehicles made in several horizontal ones Layers of apron links stacked on top of each other.

A boundary apron of this type is known in which the apron members are arranged at a small distance one above the other, so that open vertical joints between them are formed, which are sealed against the passage of pressurized gas from the cushion space Need to become. If this seal in the known apron also by a sealing skin is achieved, which at the same time an articulated connection of the apron members to their Represents bed joints, this known training requires additional effort for the sealing of the apron, which is increased by the fact that the rigidity the hinge connection at the bed joints from the lower edge of the apron upwards target.

Another known flexible perimeter skirt essentially consists from a thin flexible skin that extends from the top to the bottom of the apron consists of one piece and on which at intervals one above the other horizontal stiffening members are arranged by inwardly directed tension members to the vehicle floor are connected and between which the flexible skin is formed from the outside bulging, horizontally extending bulges is kept inflated. at a similarly designed apron are instead of the thin ones held in longitudinal folds flexible skin apron lilacs made of foam rubber in several horizontal layers on top of each other arranged and sealed at their horizontal edges by stiffening members connected to each other, which in turn are connected to the vehicle by tension members are. Apart from the fact that in this training as well as in the horizontal Longitudinal folds held flexible skin the lowermost stiffening member by a flexible sloping wall is connected to the vehicle, the apron members are made of Foam rubber on their horizontal longitudinal edges, on which they are supported by the stiffening members are sealingly connected to each other with each bend of the apron inwards heavily stressed on train, so that at the horizontal connecting joints easily Cracks can form and the seal is endangered.

The invention is intended to be a particularly simple one in a novel way and advantageous flexible containment apron of this type can be formed. For this The features of the invention are that in several horizontal layers stacked apron links through one on the lowest apron link attacking and passed through the other apron members, perpendicular to the axis elastically flexible tendon with their bearing surfaces form-fitting are loosely clamped together lying on top of each other without opening across the apron, its other held elastically resiliently by a holding device on the vehicle is.

Here, the apron members can have flat bearing surfaces be stacked on top of each other. At least one of the stacked Apron links on one side, e.g. B. the inside facing the pillow area, be provided with a bevel on one edge of the bearing surface, so that for this skirt member is a swivel joint that is closer to the tendon than the page in question.

Such swivel joints can also be formed in such a way that at least one of the stacked apron members on its bearing surface the side of the tendon is provided with a ball-like projection, which is in a corresponding recess engages in the bearing surface of the following apron member and forms a swivel joint with it.

In a boundary apron designed according to the invention with a simple cross-sectional design of the apron links over the entire height of the Perimeter skirt only requires one tendon, which is loosely stacked on top of each other Apron links holds together so resiliently that they exhibit a mutual angular displacement their storage space. At a certain voltage, the The tendon used to angularly displace one of the apron members with respect to your upper and / or lower apron link and thus to bend the apron when bumping force required against an obstacle depends on the distance between the tendon and the joint depends around which the apron member is rotated when bending the apron and its Angular position changes. With flat or level bearing surfaces of the apron links this joint point becomes through the anterior or posterior, possibly also through a side edge of the storage areas. two apron links arranged one above the other formed, depending on the direction in which the bending force occurs. The for Angular rotation of an apron member required force is therefore in size depends on the lateral protrusion of the bearing surfaces over the tendon. This lateral overhang is in turn from the profile of an apron link between the storage areas determined. By designing the apron links with a specific Profile and arrangement of the tendon at certain distances from the interior and Outer edge, possibly also from the side edges of the bearing surfaces, can therefore the size of the angular rotation of one apron link relative to the adjacent one Apron member force required for each apron member according to its Position in the flexible apron adapted to existing operational requirements will. This adaptation can be achieved through the aforementioned formation of swivel joints, which lie within the side edges of the bearing surfaces of the apron links, easily can be achieved without the apron member reduced in cross section and in its Strength needs to be weakened. Here it is also possible that at least in some of the stacked apron members the bearing surfaces in the Circumferential direction of the apron and / or laterally to the gas cushion space deviating from one another Can have area dimensions so that some of the apron links are in the circumferential direction the apron and / or on the side of the pillow space to get away from it more easily are displaceable than the other apron links.

Furthermore, the flexible apron according to the invention can be designed in this way be that at least one of the stacked apron members on the Side facing away from the cushion space, possibly also on the opposite side The inside is provided with an edge strip protruding over the storage area, which engages over the following apron link and prevents foreign matter from entering the formed by the two bearing surfaces of two apron members lying on top of one another Prevents horizontal joints.

When the stacked apron links are in further training of the invention in the circumferential direction of the apron successive apron sections can furthermore be arranged eccentrically with respect to the skirt members be.

The tendon itself can be elastically stretchable or inextensible be formed and elastically resilient at one end to form the tension be held. Furthermore, the design can be such that the voltage of the Tendon temporarily when operating the vehicle equipped with the limiting apron can be canceled. Here, the elastically flexible part of the holding device be formed by a compression spring tensioning the tensioning member upward, which is used for Relief of the tension in the tendon can be compressed from above by a pressure member is.

The pressure member can be screwed into a stationary spindle nut Screw spindle or as a stamp of a cylinder and piston device actuated by pressure medium or be designed as the core of an electromagnetic device.

Furthermore, a gas- and liquid-tight flexible skin can be arranged be the horizontal joint between at least two mutually arranged apron members seals. The skirt sections can also be in the form of layers stacked on top of one another Apron members formed struts formed by a flexible skin are sealingly connected to one another to form the apron.

Here, the apron can consist of several struts, their stacked one on top of the other Apron members in the circumferential direction of the apron have a greater width than across this or to the pillow space.

The boundary apron according to the invention can also be used with provided lower side walls and a front or rear wall of the gas cushion space Gas cushion vehicle to bridge the perimeter not taken up by these walls used in such a way that they aid in maintaining the design one between the facing ends of the side and front or rear walls arranged dense flexible skin.

In the case of such a vehicle, they can also delimit the gas cushion space Transverse walls and / or the corresponding side walls through the flexible described Boundary walls be formed according to the invention.

In a gas cushion vehicle provided with limiting aprons according to the invention acts when the vehicle moves forward by bumping into obstacles caused inward bending of the flexible apron against the pillow pressure. On the other hand, outward bends in the apron are supported by the cushion pressure. It is therefore desirable to compensate for this effect that the skirt is inwardly bends too easily on the pillow space than on the outside. This can be done with the apron according to the invention by the aforementioned special profile design of the layered one on top of the other Apron links as well as a corresponding choice of the distance between the through the Apron members passed through the tendon and the swivel joints easily reached will.

The invention is illustrated below with reference to the examples in the drawing illustrated embodiments described in more detail. In the drawing, F i g. 1 shows a gas cushion vehicle provided with the limiting apron according to the invention in side view, F i g. 2 shows a section through the lower part of the vehicle the line II-II of FIG. 1 with the boundary apron, F i g. 3 one of the F i G. 2 corresponding cut with the boundary apron bent over when it comes into contact with an obstacle, F. i g. 4 shows an embodiment of the boundary apron in which this is an uneven Has deformation characteristics, F i g. 5 a modification of the boundary skirt F i g. 2 and 3 with a device for tensioning the arranged in the apron Tendon, F i g. 6 one opposite FIG. 5 slightly modified embodiment, F i g. 7 one opposite FIG. 5 modified embodiment of the clamping device, F i g. 8 a further embodiment of the clamping device, FIG. 9 a graphical one View of part of a FIG. 2 and 3 corresponding boundary apron in the case of partial deformation or bending, FIG. 10 one from the pillow room seen diagrammatic view of the in F i g. 9 of the part of the boundary apron shown, an inner skin being omitted, FIG. 11 shows a section along the line XI-XI the F i g. 9, fig. 12 one of the FIGS. 2 corresponding section through another Embodiment of the boundary apron, FIG. 13 shows a section through the boundary apron according to FIG. 12 in the deformed state, FIG. 14 a further embodiment of the Boundary apron in a perspective view, F i a. 15 another embodiment a gas cushion vehicle provided with the limiting apron according to the invention in a perspective view and FIG. 16 the in the vehicle according to F i g. 15 arranged Boundary apron viewed from below.

The in Fig. The vehicle 10 shown in FIG. 1 is provided with a delimitation apron 12 which is arranged on the periphery of the vehicle floor and extends downward from the vehicle body 11 and delimits a cushion space 13 on the periphery between the vehicle body and the surface 14 that is floated over. In the vehicle fuselage 11 there is arranged a fan 15 which can be driven by a motor 16 and which sucks in air through the air inlet 17, 18, compresses this air and feeds it through one or more supply ducts 19 to the cushion space 13. In this, the air forms a compressed gas or compressed air cushion which is able to lift the vehicle 10 out of contact with the surface 14. During operation, air constantly escapes from the cushion space 13 between the lower edge of the limiting apron 12 and the surface that is floated over, and is replaced by the constant supply of air by the fan 15. For the forward drive of the vehicle 10 when hovering over the surface 14, a drive device 20 is arranged, which is provided with a propeller in the embodiment shown.

According to FIG. 2, the delimitation apron 12 consists of several stacked apron members 12a, 12b, 12c to 12g which, with the exception of the upper and lower apron members, are each provided with an upper and lower flat bearing surface 21 and with these bearing surfaces lie tightly on top of one another. The apron members can, viewed in the circumferential direction of the limiting apron, form individual apron sections. Each of the apron members 12 a to 12 f is provided with a passage 22 open on the bearing surfaces 21. The lowermost apron member 12g, which has only an upper flat bearing surface 21 and a rounded surface 23 at the lower end, has a corresponding passage 22 a, which is narrowed towards the upper bearing surface 21, so that an inner shoulder 24 is formed. The passages 22, 22a are closer to the inner surface 25 of the apron members 12a to 12g directly adjoining the cushion space 13 than to their outer surfaces 26 and are arranged in congruence one above the other and take a flexible clamping member 27, e.g. B. a tension wire, which is provided at its lower end with a nipple 28 or a similar abutment member and rests with this nipple against the inner shoulder 24 of the lower apron member 12g, so that the clamping member 27 does not pass through the passages 22, 22a can be pulled out upwards. The upper end of the clamping member 27 is connected to a holding device in the form of a spring device 29 or some other clamping device which tensions the clamping member 27. The spring device 29 has a spring 29a, which is supported with its lower end on part of the vehicle body 11 and with its upper end against a spring plate 29b, which rests against a nipple 30 attached to the upper end of the clamping member 27 from below. This usually keeps the spring 29a under compressive stress. Instead of the spring device 29, any other elastic and also pneumatic device can be arranged which is able to generate tensioning forces in the clamping member 27. Instead of the nipples 28, 30, screw nuts can also be arranged, which are screwed onto threaded parts of the tensioning member 27 and enable the tensioning member to be tensioned to be adjustable.

From Fig. 3 can be seen how one of the apron links 12a to 12g existing apron section in the direction of travel of the vehicle seen, lies in front or to the side, deformed when the skirt 12 with its outside against an obstacle 14a of the surface 14 floated over. In this case it will the apron section against the tension of the tension member 27 inwardly on the To bend over the cushion space 13 and, after having passed over the obstacle, through the increased tension force of the tendon back to its normal position according to F i g. 2 brought. If, which is not shown in the drawing, the front apron 12 with its inner side facing the cushion space 13 hits an obstacle, so the skirt section is bent outwards in the same way, whereby however, the forces required for this are greater than for bending the apron inward because the bending force is a function of the distance between the tendon 27 and the hinge points around which the apron is bent. The one shown Arrangement of the tendon with the larger one for bending the apron outwards Force is advantageous for aprons lying in front, because otherwise it is against the inner surface the limiting apron 12 acting pressure of the pressurized gas cushion the apron to the outside bend and cause excessive pressure gas losses from the cushion space 13. At the rear end of the vehicle, however, there are obstacles when moving forward of the vehicle usually a bend of the apron 12 from the cushion space 13 outside. For aprons arranged at the rear end of the vehicle it can therefore be advantageous to use the passages 22, 22a and thus the tendon 27 closer to the outer sides 26 than to the inner sides 25 of the apron members 12a to be arranged up to 12g.

In the embodiment according to FIG. 4 are the stacked apron members 12a to 12h in contrast to FIG. 2 and 3 designed differently in cross section so that the resistance of the apron section to deflection is different over the height of the apron. Thus, for the apron member 12a, in which the tensioning force of the clamping member 27 acts closer to the outside 26 of the apron cross-section, the resistance to bending inward is greater than that of bending outward. This is less true for the apron member 12 b, in which the tension member 27 runs more or less on average along the center line of the apron member 12 b. In the case of the apron members 12c to 12g , on the other hand, the tension member 27 runs closer to the inside 25 than to the outside of the apron cross-section. As a result, the torque of the clamping forces of the clamping member 27 with the edge of the bearing surfaces 21 on the inside 25 as a swivel joint is smaller than the torque of the clamping forces with the edge of the bearing surfaces 21 on the outside 26 as a swivel joint, so that the force for the apron members 12c to 12g to bend inward is less than the force to bend outward.

In some cases it may be desirable that the swivel for the mutual angular displacement of adjacent skirt members very close to the tendon 25 lies. In the embodiments according to FIGS. 2 to 4, however, the Apron members 12a to 12g because of the small distance between the respective Passage 22 for the tendon 27 and z. B. the inside 25 of the boundary apron relatively strong weakened in their strength. This can be done in different ways Way to be prevented.

F i g. 5 shows an embodiment in which the hinge points F, around which the stacked apron members are wrapped when the boundary apron is bent 12 to rotate inwardly onto the cushion space 13 by arranging bevels are moved close to the tendon 27 without affecting the strength of the apron members is impaired.

In the embodiment according to FIG. 6 are for this purpose on the lower storage areas 21 small protrusions B like before. Joint balls arranged in corresponding Notches N of the upper bearing surfaces 21 of the skirt members engage. The result formed joints can be placed as close as possible to the tendon, without the apron links being significantly weakened.

In Fig. 5 shows a device by means of which the tension of the tendon 27 to change the required to bend the boundary skirt Force can be adjusted. This device has a pressure stamp 50 a pressure plate 51 which can be placed on the spring device 29. The stamp 50 is articulated on an actuating lever 52, one end of which by means of the pin 53 is hinged to the vehicle body 11 and the other end with a Piston 54 @ is articulated, which forms the core of an electromagnet 55. The piston 54 is biased upward by a spring 56, but is when the winding of the electromagnet 55 is supplied with current, pulled by this down, whereby the lever 52 is pivoted downwards and the pressure plate 51 of the pressure ram 50 is placed on the spring plate 29b and pushes it down. Through this the tension in the tensioning member 27 is reduced, so that the limiting apron can be bent over 12 a smaller force is sufficient.

The possibility of reducing the tension of the tensioning member 27 is advantageous when the vehicle has to slide over larger obstacles, such as high waves or protruding rocks, because in this way the size of the impact contact between the boundary skirt 12 and the obstacles can be reduced. According to FIG. 7, the plunger 50 is designed as a screw spindle which can be driven by an electric motor 60 via a splined shaft 61 engaging in a slot in the plunger and the thread 62 of which is rotatable in a thread 63 of a stationary plate 64. When the motor 60 is put into operation, the plunger 50 is rotated and raised or lowered according to its direction of rotation, it comes into contact with the spring plate 29 b and the tension of the clamping member 27 changes depending on the direction of rotation.

If the tension of the tensioning member 27 is to be reduced in order to generate reduced impact forces when the skirt 12 comes into contact with waves, a wave detector 65 can be arranged which indicates the approach of waves which have a greater than normal height by signals from a servo switching device 66 , which then connects the power source, not shown, of the vehicle 10 to the electric motor 60 in order to lower the pressure ram. If desired, a manual switch 68 for starting up the electric motor 60 can also be arranged.

In the training according to FIG. 8, the plunger 50 is lowered and raised hydraulically. The plunger 50 is connected to the piston 70 of a hydraulic cylinder and piston device 71, in which the position of the piston in the cylinder and thus the position of the plunger is controlled by a control cylinder 72, the piston 73 of which is controlled by an at 75 on the vehicle body pivotably mounted lever 74 is moved. The lever 74 can be pivoted by hand or by a power-operated device in order to move the pressure ram 50 and thus to change the tension in the clamping member 27.

According to FIG. 9, the apron members 12a to 12g each form a strut or rib 31. The struts 31 are arranged at a distance from one another and each contain a tension member with the spring device 29 so that they can be bent over independently of one another. To form the boundary apron, the struts 31 are connected to one another on the outside 26 by a flexible skin 32 made of rubber or rubberized fabric, which is shown in FIG. 9 is only shown in the last right field, but has been omitted in the other fields for the sake of clarity. The inner surface 25 of the apron is formed by another flexible skin 33 which is arranged on the inside of the apron members 12a to 12g forming the struts and prevents foreign matter from getting between the bearing surfaces 21. Each skin 32 and 33 is attached to the apron members 12a to 12g in such a way that it rests loosely in the area of the bearing surfaces 21 and forms loose rib-like strips 34 on the outer and inner edges of the bearing surfaces 21 when the apron 12 is not bent. When the skirt 12 is then bent outwards or inwards, the loose strips are tensioned on the side of the strut or struts 31 opposite the direction of bending, while they protrude even more on the other side. In this way, the struts 31 can be bent over independently of one another without being prevented from doing so by the outer skin 32 or the inner skin 33.

In the illustration according to FIG. 10 the limit apron 12 of FIG. 2 and 3 as seen from the pillow space 13, but showing the inner skin 33 is omitted, the struts 31 a are not bent, while the strut 31 b is bent over into the cushion space 13.

It has already been mentioned that the bending characteristics of the flexible delimitation apron 12 is dependent on the spacing of the tension member 27 from the inner and outer edges of the bearing surfaces 21 of each of the apron members 12a to 12g. However, it may be desirable that the flexible skirt not only bend inwardly and outwardly, but also be compliant in the circumferential direction. The same applies to the struts 31. For example, it may be necessary that struts 31 arranged in the side boundary aprons of the vehicle 10 bend in the circumferential direction, it being useful that such a bend is easier to the rear than to the front, because the vehicle tends to move forward relative to the struts 31. To enable such bends, the clamping member 27, as in FIG. 11 z. B. is shown for the apron member 12c, be arranged closer to the rear edge 150 of the bearing surface 21 than to the front edge 151 thereof. The rear edge 150 and optionally the front edge 151 can be used in accordance with FIG. 4 and 5 be profiled in order to achieve the required bending characteristics for the strut 31.

In the modified embodiments of the limiting apron 12 according to FIG. 12 and 13, the apron members 12a to 12g are provided on the outside with downwardly protruding edge strips 12a 'to 12f, which insert into corresponding edge recesses 12a " to 12j" of the respective next lower apron member and the horizontal joints between the apron members 12a to 12g gas - and cover it in a liquid-tight manner and also prevent foreign matter from entering the bed joints. In the case of a delimitation apron designed in this way, the apron members increase when the apron is bent inwards towards the cushion space 13 as shown in FIG. 13 shown mutual position. Corresponding edge strips and edge recesses can also be arranged on the inside of the apron members 12 a to 12 f.

In the embodiments described so far, the horizontal joints are between the apron members 12a to 12g or the bearing surfaces forming these bearing joints 21 flat and even. Another training, however, also includes boundary aprons, in which the stacked apron members with arched and / or flat Bearing surfaces 21 are provided to thereby have special bending and bending force characteristics for the boundary apron that corresponds to the particular application or mode of operation of the vehicle 10 are adapted.

Furthermore, the aprons can also be used in a vehicle 10 in which, during operation, a downwardly directed fluid curtain is formed between the lower edge of the limiting apron 12 and the floated surface to further limit the circumference of the gas cushion space 13. In Fig. 12, an example of such a vehicle is indicated by dash-dotted lines. Here, on the circumference of the vehicle body 11 at a circumferential distance from one another, feed channels 35 for the fluid are arranged, which open out on the vehicle floor into a space delimited to the outside by the limiting apron 12 and to the inside by a preferably flexible wall 36, which tapers downwards and into a slightly inwardly directed nozzle 37 runs out. The fluid supplied via the supply channels 35, which consists of gas, e.g. B. air, or liquid or a gas-liquid mixture, forms when exiting the nozzle 37 a fluid curtain indicated by the dash-dotted line 38, which is deflected outward by the pressure of the gas cushion in the cushion space 13 in the direction of the arrow will. The mutual position of the wall part 36 and the boundary apron can be secured by partition walls 39.

In the case of the in FIG. 14 shown embodiment of the boundary apron 12, this is formed in sections by apron members 12a to 12g, which are shown in FIG their cross-sectional shape the apron members 12a to 12f of FIG. 2 and 3 correspond, but extend in the horizontal direction over the length of the respective section. Here, too, the struts 31 are formed similar struts, but on their Front ends butt against each other. On the outside and / or on the inside of the boundary apron 12, a skin (not shown) can be loosely arranged in each case, that of the skin 32 and 33 in FIG. 9 corresponds and a gas- and liquid-tight closure forms as well as the ingress of foreign matter between the bearing surfaces 21 of the apron members 12a to 12g prevented.

In the gas cushion vehicle serving as a watercraft according to FIG. 15, the gas cushion is delimited on the sides of the vehicle 1.0 by lateral boundary walls 112 which run essentially parallel to one another and which are in the form of rigid walls or keels, but also in accordance with FIG. 14 can be designed as flexible limiting aprons. At the front and rear ends, the gas cushion delimitation is in each case formed by a flexible delimitation apron 12 which are arranged between the side walls 112 and extend transversely to these. The boundary aprons 12 are preferably at the front and rear ends of the vehicle as shown in FIG. 14 from longitudinal sections of the apron members or from struts 31 elongated in the circumferential direction. without the forward movement of the vehicle being noticeably impaired. Instead of individual elongate sections 31 which, as with reference to FIG. 14, can be provided with additional flexible walls or wall parts for mutual sealing, each or even only one limiting apron 12 can be formed by elongated apron members extending over its entire length between the side walls 112 or according to FIG. 9 and 10 be formed. The sectional training according to FIG. 14 is, however, more advantageous than an apron formed from completely continuous apron members, because this makes local bending easier.

According to the bottom view of FIG. 16, the cushion space 13 is delimited on the sides and at the front and rear ends by longitudinal side walls and transverse walls 112 , all of which can be designed either as flexible delimitation aprons according to the invention or in any other way. However, the longitudinal walls and transverse walls do not collide directly, but are connected to one another at the corners of the cushion space 13 by curved corner aprons 12, which are in any case designed as boundary aprons according to the invention. The corner aprons 12 are made in accordance with FIG. 9 to 11 from individual struts 31 which are arranged between an outer skin 32 and an inner skin 33. Each skin 32, 33 is sealingly connected to the ends of the side and transverse walls 112, so that no gas can escape from the cushion space 13 at the connection points between these walls and the corner aprons 12.

The limiting aprons 12 designed according to the invention are easily deformable or bendable, so that when moving forward one with such Aprons provided vehicle this can slide over obstacles without that it is substantially impaired in its forward movement. For vehicles, in which the transverse walls and / or side walls 112 are designed to be flexible, enables the arrangement of the flexible aprons 12 in the manner described that each wall 112 can be bent over by obstacles without going through an adjacent wall 112 from being prevented and without an increased loss of gas from the cushion space 13 is brought about. If z. B. the front transverse wall 112 according to the embodiment F i g. 16 is bent inwards, the bending of the longitudinal walls is hindered 112 inward, as it would otherwise occur if the ends of the walls 112 were immediately would collide, not one. The front wall and the long side walls can also be used 112 can be bent outwards without a noticeably greater loss of cushion gas enters between the ends of the walls 112.

In a non-illustrated modification of the embodiment according to F i g. 9 and 10, the struts 31 can be somewhat wider in the circumferential direction of the apron and be arranged directly adjacent to one another. Here the inner skin 33 can be omitted while the outer skin 32 is retained to allow entry to prevent foreign matter in the bed joints between the apron links.

Claims (1)

Claims: 1. Flexible limiting apron for gas cushion vehicles made of apron members stacked one on top of the other in several horizontal layers, d a'-characterized in that the apron members (12a to 12h) are perpendicular to the apron members (12a to 12h) engaging on the lowermost apron member (12h) and passed through the other apron members Axis elastically resilient clamping member (27) with their bearing surfaces (21) are clamped together loosely on top of one another in a form-fitting manner without opening transversely to the apron, the other end of which is held elastically resiliently in the axial direction by a holding device (29) on the vehicle. z. Boundary apron according to Claim 1, characterized in that the apron members (12a to 12h) are stacked on top of one another with flat bearing surfaces (21). 3. delimitation apron according to claim 2, characterized in that at least one of the stacked apron members (12a to 12h) is provided on one side (25) with a bevel on one edge of the bearing surface (21) so that a swivel joint for this apron member (F) is formed, which is closer to the clamping member (27) than the relevant side (25). 4. Limiting apron according to one of claims 1 to 3, characterized in that at least one of the stacked apron members (12 a to 12 h) is provided on its bearing surface (21) laterally from the clamping member (27) with a spherical projection (B) which engages in a corresponding recess (N) in the bearing surface (21) of the following apron member and forms a swivel joint with this. 5. delimitation apron according to one of the preceding = preceding claims, characterized in that at least one of the stacked apron members (12a to 12h) on the side (26) facing away from the cushion space (13), optionally also on the opposite inner side (25) with a is provided over the bearing surfaces (21) protruding edge strip (12a to 12g '), which engages over the following apron member and prevents the entry of foreign matter into the bed joint formed by the two bearing surfaces (21) of two superimposed apron members. 6. delimitation apron according to one of the preceding claims, characterized in that the stacked apron members (12a to 12h) form successive apron sections in the circumferential direction of the apron (12). 7. limiting apron .nach claim 6, characterized in that the clamping member (27) is arranged eccentrically with respect to the apron members (12a to 12h). B. limiting apron according to one of the preceding claims, characterized in that the clamping member (27) is designed to be stretchable. 9. Limiting apron according to one of the preceding claims, characterized in that the tension of the tensioning member (27) can be temporarily canceled during operation of the vehicle provided with the limiting apron (12). 10. limiting apron according to claim 9, characterized in that the elastically resilient part of the holding device (29) is formed by a tensioning member (27) upwardly tensioning compression spring (29 a) which is used to relieve the tension in the tensioning member by a pressure member ( 50) is compressible from above. 11. limiting apron according to claim 10, characterized in that the pressure member (50) as in a stationary spindle nut (64) screwable screw spindle (62, 63) or as a stamp of a pressure fluid-operated cylinder and piston device (70, 71, 72, 73) or is designed as the core of an electromagnetic device (54, 55, 56). 12. Boundary apron according to one of the preceding claims, characterized by a gas- and liquid-tight flexible skin (32, 33) which seals the bearing joint between at least two apron members (12a to 12h) arranged on top of one another. 13. Limiting apron according to one of claims 6 to 11 in conjunction with claim 12, characterized in that the apron sections are formed in the form of struts (31) formed from the stacked apron members (12a to 12h) which are supported by a flexible skin (32 and / or 33) are sealingly connected to one another to form the apron (12). 14. Limiting apron according to claim 13, characterized in that it consists of several struts (31), the stacked apron members (12a to 12h) have a greater width in the circumferential direction of the apron than transversely to this or to the cushion space (13). 15. Use of the boundary apron according to one of the preceding claims on a side wall vehicle for bridging the circumferential limitation not occupied by the side wall and the front or rear wall (112) in such a way that it provides support for maintaining the design between the mutually facing ends of the sides - and front or. Rear wall (112) arranged dense flexible skin (32 or 33) forms. Documents considered: French Patent No. 1377 625; British Patent Nos. 958 996, 962 995.