Abstract:
The invention relates to a vehicle seal ( 100 ) having a tilt adjustment device, more particularly as a component of a rear row of seats of a motor vehicle, comprising a backrest and a seat part ( 12 A), which is movably arranged about a horizontal pivot axis (Y 1 ) for setting the seat tilt independent of the backrest by means of a seat tilt adjustment device, wherein the pivot axis (Y 1 ) runs between a moving cushion part ( 12 A- 1 ) and a fixed cushion part ( 12 A- 2 ). It is provided that the tilt adjustment device has an upper support plate ( 40 ) and a lower support plate ( 30 ), wherein the moving cushion part ( 12 A- 1 ) rests on the upper support plate ( 40 ), wherein an actuator ( 50 ), arranged between the support plates ( 30, 40 ), can effect a movement of the upper support plate ( 40 ) relative to the lower support plate ( 30 ), whereby the moving cushion part ( 12 A- 1 ) can be moved from an essentially flat un-raised position into a tilted raised position.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a National Phase of PCT International Application No. PCT/EP2012/003822, International Filing Date Sep. 12, 2012, claiming priority of German Patent Application No. 10 2011 118 344.6, filed Nov. 11, 2011, which are hereby incorporated by reference in their entirety. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The present invention relates to a vehicle seat, in particular a rear seat system having a seat inclination adjustment device. 
       BACKGROUND OF THE INVENTION 
       [0003]    In a generally known vehicle seat of the species in question including a seat part and a backrest part, the seat part having a raisable and lowerable seat front edge is mounted pivotably about a horizontal transverse axis for a seat inclination adjustment. 
         [0004]    It is further generally known to manufacture seat parts and backrest parts with a wire frame as a lattice frame, the cushioning being made of a foam part and a cover in each case. 
         [0005]    It is further generally known to design the rear seat row of a vehicle as a seat bench and to symmetrically or non-symmetrically divide the associated backrest, one backrest part or both backrest parts being foldable onto a seat of the seat bench to enlarge the trunk compartment. 
         [0006]    The publication DE 10 2009 020 659 A1, for example, describes a vehicle seat including at least a seat part and a backrest part, in which the seat part having a raisable and lowerable seat front edge is mounted pivotably about a horizontal transverse axis for a seat inclination adjustment. A seat front part is freely pivotable between an upper end position having a raised seat front edge to support the thigh and a lower end position having a lowered seat front edge, and the pivotable seat front part is pretensioned in the direction of the upper end position by at least one spring element. 
         [0007]    Another publication, DE 10 2005 039 310 A1, discloses an adjustable rear seat. The rear seat includes a seat pan, a seat cushion accommodated by the same, a backrest support, a backrest cushion accommodated by the same, and a headrest mounted in the backrest support. The seat pan and the backrest support are hinged to each other. The top area of the backrest support is pivotably mounted in the auto body. The front area of the seat pan is mounted in the body floor, the seat pan being adjustable in the longitudinal direction and vertical extension of the vehicle with the aid of actuating means mounted in the body floor. 
         [0008]    Such a seat inclination adjustment is used to improve seat comfort with the aid of a thigh support which is adapted to a thigh inclination. Conventional systems for adjusting the seat inclination generally result in relatively complex seat frames having mechanical adjusters, latches and operations at accordingly high costs. Separate actuating levers as actuating means for the seat pan are required in particular in the adjustable rear seat of DE 10 2005 039 310 A1. Such actuating levers typically interfere considerably since they need to be situated close to the operating site, which mostly results in a limitation of comfort. The use of spring elements for raising a seat front part of a vehicle seat according to the publication DE 10 2009 020 659 A1 appears to be inexpensive and simple; however, the disadvantage is that, once a spring element having a corresponding characteristic spring curve is selected, it allows individual raising of a seat part only conditionally. It is not possible to implement intermediate positions in a solution having spring elements. 
       SUMMARY OF THE INVENTION 
       [0009]    Proceeding from this related art, it is the object of the present invention to design a vehicle seat, in particular as an integral part of a rear seat row of a vehicle, in such a way that improved seat comfort is provided using simple and cost-effective measures. 
         [0010]    The starting point is a vehicle seat, in particular as an integral part of a rear seat row of a motor vehicle, including a backrest and a seat part, which is situated movably about a horizontal pivot axis for setting the seat inclination independently of the backrest with the aid of a seat inclination adjustment device, the pivot axis extending between a movable cushion part and a fixed cushion part. 
         [0011]    A vehicle seat of this species is described in the publication DE 10 2009 020 659 A1, for example. 
         [0012]    Deviating from this related art, it is provided according to the present invention that the adjustment device includes a top support plate and a bottom support plate, the movable cushion part resting on the top support plate, an actuating means with the aid of which it is possible to bring about a movement of the top support plate relative to the bottom support plate being situated between the support plates, whereby it is possible to bring the movable cushion part from an essentially planar non-excursion position into an inclined excursion position. 
         [0013]    In one preferred embodiment of the present invention, the cushion parts are designed in one piece or in two pieces, the movable cushion part and the fixed cushion part in the two-piece embodiment forming a butt joint. The butt joint completely separates the movable from the fixed cushion part in a first embodiment variant, or the butt joint is formed only partially in a second embodiment variant, so that the movable cushion part is still partially connected to the fixed cushion part. A flexible foam allows a one-piece design, while less flexible foams, if necessary, require a two-piece design of the cushion parts having an at least partially implemented butt joint. A one-piece design is more advantageous than a two-piece design with respect to simpler manufacturing. A two-piece design having a vertical butt joint in the y direction is described in greater detail in one exemplary embodiment, since a one-piece design does not require further explanation. 
         [0014]    In one further preferred embodiment, it is provided that the pivot axis of the movable cushion part is formed close to the top side of the mutually adjoining cushion parts, a butt joint being situated in the top area of a longitudinal axis of the butt joint in particular with a two-piece design of the cushion parts, whereby a high pivot point position of the movable cushion part in relation to the fixed cushion part is formed. 
         [0015]    In one preferred embodiment of the present invention, the bottom support plate is connected to a car body or the bottom support plate is connected to the body via a wire frame. The design having the wire frame is described in greater detail in the exemplary embodiment. 
         [0016]    In one preferred embodiment, it is further provided that the bottom support plate is attached to the wire frame, which is fixed to the body, in a stable position in the front and back areas on transverse wires provided for this purpose. 
         [0017]    In one advantageous embodiment, the top support plate is attached to the bottom support plate. 
         [0018]    This attachment is advantageously designed in such a way that the top support plate includes at least one engagement element which engages in at least one guide element of the bottom support plate. In this way no separate joining elements are required. 
         [0019]    Advantageously, this results in a special positioning of the at least one engagement element with respect to the at least one guide element and in a functionality of the adjustment device of the vehicle seat, which is that the at least one engagement element is situated completely in the at least one guide element in the non-excursion position, while the at least one engagement element is movable out of the at least one guide element in the excursion position. The elements, the top support plate and the bottom support plate are able to move relative to each other almost without friction and without additionally necessary joining elements. 
         [0020]    Moreover, it is provided that the at least one engagement element and the at least one guide element have semi-circular designs. In addition to the described functionality per se, advantageously the movement of the top support plate relative to the bottom support plate is optimally matched to the desired pivoting movement of the movable cushion part resting on the top support plate. 
         [0021]    Further preferred embodiments of the present invention are derived from the remaining features described in the subclaims. 
         [0022]    One possible design of the present invention is described hereafter in one exemplary embodiment. For the purposes of the description, the direction situated in the longitudinal direction of the vehicle shall be referred to as “x.” “y” denotes the direction in the horizontal of the vehicle transversely to the x direction, and “z” denotes the direction in the vertical of the vehicle transversely to the x direction. This nomenclature of the spatial directions using Cartesian coordinates corresponds to the coordinate system generally used in the automotive industry. Identical reference numerals are used hereafter for identical components within all figures; if necessary, not every figure will again explain all previously introduced components based on the reference numerals. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0023]      FIG. 1  shows a perspective illustration of a rear seat system; 
           [0024]      FIG. 2  shows a section in the longitudinal direction through a vehicle seat, as an integral part of the rear seat system according to  FIG. 1 ; 
           [0025]      FIG. 3  shows a bottom support plate of the vehicle seat; 
           [0026]      FIG. 4  shows a top foam support plate of the vehicle seat; 
           [0027]      FIGS. 5A through 7B  show a wire frame to which the bottom support plate is attached; 
           [0028]      FIG. 8  shows an enlarged perspective illustration of a seat part of the rear seat system according to  FIGS. 1 through 7B ; 
           [0029]      FIG. 9  shows an enlarged schematic illustration of the first seat part of the rear seat system according to  FIG. 8 , however in a top view; and 
           [0030]      FIG. 10  shows an enlarged longitudinal section of the seat part of the vehicle seat, in particular of the first seat part of the rear seat system according to  FIGS. 8 and 9 . 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0031]      FIG. 1  shows a rear seat system of a motor vehicle situated on an auto body K. 
         [0032]    The rear seat system is designed in three pieces, the three-piece design, which is known per se, of the rear seat system being configured in a ratio of 40/20/40. A 40% portion of the rear seat system forms a vehicle seat  100 , which is an integral part of the rear seat row of a motor vehicle. As is shown in  FIG. 1 , such a vehicle seat  100  includes a seat part  12 A ( 12 A- 1 ′,  12 A- 2 ) and a backrest; however, the associated backrest is not shown. 
         [0033]    The perspective depiction of  FIG. 1  already illustrates a special feature of the present invention, which is that first seat part  12 A includes a first movable cushion part  12 A- 1  and a first fixed cushion part  12 A- 2 . Cushion parts  12 A- 1 ,  12 A- 2  are situated behind each other in the x direction, which corresponds to the customary driving direction of the motor vehicle, and form an essentially planar seat surface in a non-inclined starting position (non-excursion position). In this starting position, a second seat part  12 B (seat center part) and a third seat part  12 C, together with first seat part  12 A, form an essentially planar seat surface of the three-piece rear seat system. 
         [0034]    Analogously to first seat part  12 A, second and third seat parts  12 B,  12 C in each case form a second movable cushion part  12 B- 1 , and a third movable cushion part  12 C- 1  and a second fixed cushion part  12 B- 2 , and a third fixed cushion part  12 C- 2  situated behind that in the x direction. It becomes apparent that second and third seat parts  12 B,  12 C also meet the requirements to be able to carry out an inclination adjustment of seat part  12 B,  12 C analogously to the first seat part  12 A. In  FIG. 1 , first seat part  12 A is shown already in an upwardly raised inclined position (′) (excursion position) relative to the body K or relative to adjoining seat parts  12 B,  12 C. In  FIG. 1 , thus only first movable cushion part  12 A- 1 ′ has been adjusted into the inclined position (′), this function also being implementable for second and third movable cushion parts  12 B- 1  and  12 C- 1 . 
         [0035]    A side cushion  12 D is situated in each case laterally from first seat part  12 A and third seat part  12 C—viewed in the y direction—which closes the space between the side areas of body K and the side areas of first and third seat parts  12 A,  12 C, so that a widened comfortable seat surface is formed in the x direction from seat parts  12 A,  12 B,  12 C and side cushions  12 D. 
         [0036]    To simplify the explanation, hereafter only first seat part  12 A is addressed, which forms part of vehicle seat  100 , which, once again, is an integral part of the rear seat system. The description may be applied analogously to second and third seat parts  12 B,  12 C of the rear seat system. 
         [0037]      FIG. 2  illustrates the approach according to the present invention in a longitudinal section situated in the x direction through first seat part  12 A. This longitudinal section essentially shows first movable cushion part  12 A- 1  in its starting position and in inclined position  12 A- 1 ′, and first fixed cushion part  12 A- 2  above body K. An installation space is set up beneath first movable cushion part  12 A- 1  proceeding from its starting position and above body K, a device for adjusting the inclination of first movable seat cushion part  12 A- 1  being situated in this space. A detailed embodiment of this device is addressed in the further figures. 
         [0038]      FIG. 2  initially illustrates that, in a two-piece design of cushion parts  12 A- 1 ,  12 A- 2 , a vertical butt joint  12 E extending in the z direction is formed between first movable cushion part  12 A- 1  and first fixed cushion part  12 A- 2 . In the starting position of first movable cushion part  12 A- 1 , the rear end face of first movable cushion part  12 A- 1  is situated parallel to the front end face of first fixed cushion part  12 A- 2 . Vertical butt joint  12 E does not form a gap  12 F. Pivot axis Y 1  of first movable cushion part  12 A- 1  is situated close to the upper end of vertical butt joint  12 E. 
         [0039]    Pivot axis Y 1  is situated beneath the surfaces of adjoining cushion parts  12 A- 1 ,  12 A- 2  by a small vertical distance, so that a high pivot point position is formed for first movable cushion part  12 A- 1  in relation to first fixed cushion part  12 A- 2 . The pivot point position pivot axis Y 1  is matched to a hip point of an average person, whose hip point axis Y 2  is situated in the y direction. 
         [0040]    Since pivot axis Y 1  is situated only a small distance beneath the surfaces of adjoining cushion parts  12 A- 1 ,  12 A- 2 , the movement of first movable cushion part  12 A- 1  from the non-excursion position into excursion position  12 A- 1 ′ causes minor compression in a compression area S of the foam or of the shared cover in the upper area of the adjoining cushion parts above pivot axis Yl. 
         [0041]    During the movement of first movable cushion part  12 A- 1  from the non-excursion position into excursion position  12 A- 1 ′, a small gap  12 F is formed beneath pivot axis Yl, so that this area experiences minor strain in a strain area D of the cover covering, if necessary, cushion parts  12 A- 1 ,  12 A- 2  in the lower area. 
         [0042]    Since two cushion parts  12 A- 1 ,  12 A- 2  are provided with a covering cover at least in the upper area, an observer of seat part  12 A advantageously does not notice that first seat part  12 A includes a front first movable cushion part  12 A- 1  and a rear fixed cushion part  12 A- 2 . Vertical butt joint  12 E formed between cushion parts  12 A- 1 ,  12 A- 2  situated behind each other in the x direction is thus situated beneath the cover and is hidden to the observer. 
         [0043]    In a one-piece design, the formation of vertical butt joint  12 E and of gap  12 F is dispensed with, while the pivot point position and the compression area as well as the strain area forms analogously in the flexible foam and the cover situated above and, if necessary, beneath the same. 
         [0044]      FIG. 3  shows a bottom support plate  30 , which is used as a support element for the inclination adjustment device, as is illustrated in  FIG. 8 . Bottom support plate  30  is situated above body K on a wire frame  20  in the exemplary embodiment. Bottom support plate  30  may be directly connected to body K in another embodiment. 
         [0045]    Bottom support plate  30  includes guide elements  31 , which are used to secure a foam support plate  40 , which in  FIG. 4  is already situated on bottom support plate  30 . Guide elements  31  have a semi-circular design. The area of bottom support plate  30  and that of top foam support plate  40  provided thereabove, which are situated in each case in the area of guide elements  31 , thus also have a semi-circular design. The rear area on foam support plate  40  is inserted into guide elements  31  forming a receptacle, so that bottom support plate  30  and foam support plate  40  are situated in an essentially parallel position with respect to each other in the non-excursion position. 
         [0046]      FIGS. 3 through 7C , viewed together, show how bottom support plate  30  is connected to wire frame  20 .  FIGS. 7A through 7C  show wire frame  20  and bottom support plate  30  in a bottom view.  FIG. 6B  shows a wire frame according to the related art situated next to wire frame  20  for comparison. This known wire frame is supplemented by additional wires, or the course of the wires is changed, according to the present invention. Within wire frame  20 , the course of a front transverse wire  21  is changed, and additionally a rear transverse wire  24  is implemented, as  FIG. 6A  shows by comparison. Front transverse wire  21  is now situated lower than the front transverse wire according to the related art and is connected to the bottom side of bottom support plate  30 . This creates installation space for the inclination adjustment device and top support plate  40 . 
         [0047]    Moreover, an additional rear longitudinal wire  22  and an additional lateral longitudinal wire  23  are implemented. Transverse wires  21 ,  24  are situated essentially in the y direction in the installed state of vehicle seat  100 . Longitudinal wires  22 ,  23  are situated essentially in the x direction in the installed state of vehicle seat  100 . 
         [0048]    Front transverse wire  21  is situated beneath bottom support plate  30  in the installed state of vehicle seat  100 . According to  FIG. 7B , hooks  32 , with the aid of which bottom support plate  30  is latchable to front transverse wire  21 , are situated as attachment elements beneath bottom support plate  30 . Wire frame  20 , which is attached to the body, thus secures bottom support plate  30  in the z direction. A detent means  26 , which detachably connects front transverse wire  21  to body K by detent means  26  engaging in body K, is shaped as part of front transverse wire  21 . Two detent means  26  are provided on a wide rear seat system, as is shown in  FIGS. 6A ,  6 B. 
         [0049]    Another attachment of wire frame  20  to body K is situated in each case laterally from wire frame  20  (see  FIG. 6A ,  6 B) between lateral longitudinal wire  23  and a lateral excursion wire  25 , excursion wire  25  and lateral longitudinal wire  23  at the same time serving as support for the particular side cushion  12 D. A hook/eye connection  27  (see  FIGS. 6A ,  6 B) is implemented between lateral longitudinal wire  23  and a lateral excursion wire  25 . An eye on the wire frame side engages in a hook on the body side. A wire frame  20 , whose longitudinal axis in the exemplary embodiment is designed transversely to driving direction x in the y direction over the entire rear seat system, is thus securely connected to body K at three points by a lateral hook/eye connection  27  and by detent means  26 . 
         [0050]    A rear transverse wire  24  is situated parallel to front transverse wire  21 . Rear transverse wire  24  is held in a stable position within wire frame  20  by rear longitudinal wire  22  within wire frame  20 . Bottom support plate  30  engages in rear transverse wire  24  with the aid of clips  33  which are open in the z direction, as is shown in  FIGS. 5A ,  5 B and  7 C, so that the bottom support plate is also secured in the x direction. 
         [0051]    Rear longitudinal wire  22  further passes through an end-face wall  34  of bottom support plate  30 , so that bottom support plate  30  is secured on wire frame  20 , which is fixed to the body, also against displacements in the y direction. 
         [0052]    Front transverse wire  21  laterally transitions into lateral longitudinal wire  23  to which a side cushion  12 D may be fixed, so that side cushion  12 D may be situated in a stable position next to first seat part  12 A. 
         [0053]      FIGS. 5A ,  5 B and  7 A collectively show another special feature of the present invention.  FIG. 7A  shows guide elements  31  in a view from beneath.  FIGS. 5A ,  5 B show guide elements  31  in an enlarged view from above. 
         [0054]    Guide elements  31  are designed as low-friction receptacles, whose inner contours correspond to the outer contours of rail-like engagement elements  41  of top foam support plate  40 . Due to the web-like design of guide elements  31 , engagement elements  41  are movable in a friction-fit and form-locked manner, in particular in a low-friction manner, and in another advantageous manner are situated in guide elements  31  without additional elements, such as brackets, hinges or the like. 
         [0055]      FIG. 5A  shows the non-excursion position, while  FIG. 5B  shows the excursion position. See also the excursion position of  FIG. 10  in this regard. In the upwardly inclined position (′) of front first movable cushion part  12 A- 1 ′, top foam support plate  40  is displaced with respect to bottom support plate  30 , so that during the pivoting movement of top foam support plate  40  rail-like engagement elements  41  slide on a semi-circular track out of guide elements  31 , as is shown in  FIG. 5B . The end-face ends of engagement elements  41  are no longer seated flush against wall  34  of bottom support plate  30  in  FIG. 5B  as compared to  FIG. 5A , but engagement elements  41  have shifted with respect to guide elements  31 , as the end faces of guide elements  31  in  FIG. 5B  illustrate, which are now situated in guide elements  31 . 
         [0056]    The original state ( FIG. 5A ) is restored when top foam support plate  40  returns to the non-excursion position. In this non-excursion position, rail-like engagement elements  41  are completely seated in guide elements  31 . The circular design of guide elements  31  and of engagement elements  41 , as well as the low-friction movable positioning of engagement elements  41  in guide elements  31 , allow a smooth movement of top foam support plate  40  relative to bottom support plate  30 . 
         [0057]      FIG. 8  shows first seat part  12 A to illustrate the layered composition of the inclination adjustment device, the foam of first movable cushion part  12 A- 1 , which in  FIG. 8  is in excursion position  12 A- 1 ′, having been partially omitted and top support plate  40  being illustrated transparently. 
         [0058]    Bottom support plate  30 , which is connected to wire frame  20 , is seated on body K. Air chambers  50 , which serve as actuating means for the inclination adjustment of first movable cushion part  12 A- 1 , are situated on bottom support plate  30 . Air chambers  50  are another special feature. Air chambers  50  enable the inclination adjustment, without necessitating an interfering actuating means in the visible area of vehicle seat  100  or of the rear seat system, or in the area of the seat surface. Air chambers  50  are fillable via a very small actuating element used to temporarily activate a compressor.  FIG. 8  shows air chambers  50  consistent with the excursion position of first movable cushion part  12 A- 1 ′ in the filled state. Air chambers  50  are drained by opening drain valves, which may also be opened at least temporarily via an actuating element, the force for pressing the air chambers together into the drained state being caused by the inherent weight of first movable cushion part  12 A- 1  and, if necessary, additionally by the weight of a person sitting on vehicle seat  100 . 
         [0059]    It is provided to set up an installation space in side cushion  12 D for the associated compressor (not shown). 
         [0060]      FIG. 9  shows vehicle seat  100  once again in a top view, the foam of cushion parts  12 A- 1  and  12 A- 2  having been omitted. With the aid of the dash-dotted lines this view illustrates the course of the trim line along which the cover is attached and tautened. The cover of side cushion  12 D is trimmed on lateral excursion wire  25  and on a longitudinal wire of side cushion  12 D. The cover of first movable cushion part  12 A- 1  is via a trim channel  42  in foam support plate  40 . The cover is attached in each case in the lower area of side cushion  12 D or of first movable cushion part  12 A- 1 . 
         [0061]    Finally,  FIG. 10  shows a longitudinal section through vehicle seat  100 . It is provided to shield the area opening in the excursion position on the front side of vehicle seat  100  with a screen  60 , preferably a thin flexible material. The material includes a pull strap or the like on the back side, the pull strap tautening the material in the excursion position of first movable cushion part  12 A- 1 ′ and pulling it inward during the transition from the excursion position to the non-excursion position. 
         [0062]    A vehicle seat  100  or a rear seat system including an adjustable backrest and an adjustable seat part  12 A has the advantage that an upper body is not overstretched in relation to the lower body of a person sitting thereon in the case of a strongly inclined backrest due to the inclination adjustment of seat part  12 A. It is known that a combination of backrest and seat inclination adjustment results in a considerably more ergonomical sitting posture. The provided vehicle seat  100 , in particular as part of a rear seat system, represents a simple and cost-effective vehicle seat  100 , which improves the seat comfort as desired. 
         [0063]    The approach may be applied similarly to an undivided rear seat system. In such a case, the associated seat part as a whole is raised in the width provided for the rear seat system into an excursion position. 
       LIST OF REFERENCE NUMERALS 
       [0064]      100  vehicle seat (rear seat system) 
         [0065]      12 A first seat part 
         [0066]      12 A- 1  first movable cushion part 
         [0067]      12 A- 2  first fixed cushion part 
         [0068]      12 A- 3  rear connection 
         [0069]      12 B second seat part (seat center part) 
         [0070]      12 B- 1  second movable cushion part 
         [0071]      12 B- 2  second fixed cushion part 
         [0072]      12 C third seat part 
         [0073]      12 C- 1  third movable cushion part 
         [0074]      12 C- 2  third fixed cushion part 
         [0075]    (′) inclined position 
         [0076]      12 D side cushion 
         [0077]      12 E vertical butt joint 
         [0078]      12 F gap 
         [0079]    K body 
         [0080]    H hip point of a person 
         [0081]    Y 1  pivot axis 
         [0082]    Y 2  hip axis 
         [0083]    S compression area 
         [0084]    D strain area 
         [0085]      20  wire frame 
         [0086]      21  front transverse wire 
         [0087]      22  rear longitudinal wire 
         [0088]      23  lateral longitudinal wires 
         [0089]      24  rear transverse wire 
         [0090]      25  lateral excursion wire 
         [0091]      26  detent means 
         [0092]      27  hook/eye connection 
         [0093]      30  bottom support plate 
         [0094]      31  guide elements 
         [0095]      32  hook 
         [0096]      33  clip 
         [0097]      34  wall 
         [0098]      40  top support plate (foam support plate) 
         [0099]      41  engagement elements 
         [0100]      42  trim channel 
         [0101]      50  air chambers (actuating means) 
         [0102]      60  screen 
         [0103]      61  pull strap