Abstract:
The subject matter of the invention is a floor of a dome module as an interface between an air passenger bridge or air passenger stairs and the airplane, wherein the floor comprises a stationary floor section and a floor head part, wherein the floor head part exhibits several floor segments, which are connected to one another by a buffer cross-beam that is flexible over at least a portion of its length, wherein several floor segments are horizontally displaceable relative to one another.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority of German Patent Application DE 10 015 408.7-2422 filed Dec. 8, 2010. 
     FIELD OF THE INVENTION 
     The invention relates to the floor of a dome module as an interface between an air passenger bridge or air passenger stairs and an airplane, wherein the floor comprises a stationary floor section and a floor head part. 
     BACKGROUND OF THE INVENTION 
     Air passenger bridges are sufficiently well known from the prior art. Air passenger bridges are used for transferring persons from the airplane directly into the airport terminal. Since the airport terminal is usually higher than the door opening of the airplane, the air passenger bridges, which are held on the front end by an undercarriage, frequently run diagonally downward in the direction of the door opening of the airplane. At the lower end of the passenger bridge the air passenger bridge exhibits a cabin that can be rotated up to 90° to the longitudinal axis of the air passenger bridge, wherein on the front end a dome module is arranged for transfer from the cabin to the airplane. In similar fashion a dome module is also provided for air passenger stairs as an interface for transfer to the airplane. 
     The dome module as an interface between the actual air passenger bridge or the air passenger stairs and the airplane comprises according to the prior art a floor as well as a U-shaped bellows spanning the floor as a roof. The bellows likewise exhibits a so-called U-shaped rotary bumper, wherein the bellows, in order to ensure contact over the entire area of the U-shaped bellows on the front end on the skin of the airplane, can be moved out to variable extents on both sides. This problem is, in and of itself, sufficiently known. Regarding the floor it is known from the prior art that the floor exhibits a stationary element and a floor head part, said floor head part as a whole being horizontally displaceable relative to the stationary floor element. However, this means that when such a dome module is attached in the region of the front end of an airplane, that is, in the region of the transition to the cockpit, a gap then remains at least in the direction of the cockpit. When the airplane door swings open outward, the gap or at least a part of the gap is covered by the airplane door upward. If this is not the case, that is, if the door for example opens inward, then a barrier must be used to prevent persons from getting into the region of this gap. In this respect it is also known to design the floor in two parts, wherein the one part of the floor is outwardly pivotable in the direction of the airplane. It can be immediately understood that with such a solution on the one hand a formation of a gap between the fuselage of the airplane and the front side of the floor can be lessened but not completely prevented. 
     SUMMARY OF THE INVENTION 
     Consequently the invention addresses the problem of providing a floor of a dome module as an interface between an air passenger bridge or air passenger stairs of the initially named type with which an essentially gap-free transition from the floor of the dome module to the airplane fuselage is made possible. 
     For solution of this problem in the case of a floor of the initially named type it is proposed that the floor head part exhibits several floor segments which are connected to one another by means of a flexible buffer cross-beam, wherein the several floor segments are horizontally displaceable relative to one another. Through the buffer cross-beam that is flexible in longitudinal direction, on which the individual floor segments are arranged on the top, it is now possible to provide an essentially gap-free transition from the floor of the dome module to the skin of the airplane in dependency on the size of the individual floor segments. On the ends opposite the buffer cross-beam the floor elements are connected to the stationary floor section. The floor head part is held by guide elements in guide receptacles on the floor of the dome module on the stationary floor section. 
     Advantageous features and embodiments of the invention can be found in the dependent claims. 
     Thus according to a special feature of the invention provision is in particular made that the floor exhibits a drive device for horizontal displacement for horizontal displacement of the floor segments. From this it becomes clear that the individual floor segments are horizontally, i.e. in the direction of the airplane fuselage, displaceable, to be precise by means of a drive device in order to make possible an automatic placement of the floor on the skin of the airplane. 
     The drive device itself comprises in particular several, in particular two spring elements which are advantageously constructed as gas springs which are firmly mounted on their one end, e.g. on the floor frame, and on their other end are connected to the flexible and displaceable buffer cross-beam. 
     In particular it has proved to be advantageous that a pulling device is provided for the retraction of one or more floor segments, wherein the pulling device counteracts the force of the spring elements and here in particular of the gas springs. This means that the gas springs press the buffer cross-beam outward over its length in horizontal direction, but the pulling device counteracts it, so that by actuating the pulling device a contact for the purpose of pressing the buffer cross-beam against the skin of the airplane is made possible. The pulling device comprises at least two straps, wherein the at least two straps, spaced apart from one another are connected to the flexible buffer cross-beam. In particular in this connection provision is made that a longer spring element, for example a gas spring, is arranged on the one end of the flexible buffer cross-beam which is to be pivoted outward the furthest, while the second shorter spring element is arranged at a position of the flexible buffer cross-beam from where the buffer cross-beam runs essentially straight, thus does not undergo an arc-shaped displacement, but rather, if necessary, can be extended only by a small amount. However, in this connection it is also conceivable to provide three spring elements, to be precise arranging one spring element in about the center of the flexible buffer cross-beam and linking the two remaining spring elements to the end of the cross-beam. In this respect it is then possible to also reproduce a circular-arc-shaped arch, which with regard to the skin of different airplane types is likewise of interest. 
     According to a further feature of the invention the pulling device comprises a tubular motor drive, wherein the tubular motor drive exhibits at least two spring-loaded rollers for holding straps. A tubular motor drive is embodied as a tube which is put in rotation by means of a motor arranged therein. There are at least two spring-loaded rollers on the outer jacket of the tubular motor drive. 
     It has already been mentioned elsewhere that the spring elements, in particular the gas springs, carry out a different path in horizontal direction. In the case of corresponding arrangement of the at least two straps this results in the number of revolutions of the tubular motors for release of the strap for the outgoing movement of the flexible buffer cross-beam being adjusted in accordance with the greatest displacement of the spring element which can be folded out the most. However, this means that the other strap, likewise arranged on a spring-loaded roller, whose outgoing path is shorter, is likewise pulled out shorter. Since the number of revolutions of the tubular motors over its length is however the same, this results in the strap sagging. Through the use of spring-loaded rollers the excess strap length can be compensated. 
     According to another feature of the invention the floor segments are displaceably connected to one another vertically offset to one another. This against the background that in the case of a pivoting movement of the buffer cross-beam the floor segments connected to it execute a likewise arc-shaped movement, and in this respect due to the vertically offset arrangement of the floor segments to one another an overlapping is made possible. In this connection provision is further made that the floor segments are pivotably connected to the flexible buffer cross-beam by vertical axes. 
     To prevent damage from occurring when the buffer cross-beam comes into contact with the airplane skin, the buffer cross-beam, which can for example be made of a spring steel, exhibits an elastic impact buffer (bumper) on the exterior front side. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be explained in greater detail in the following with the help of the drawings. 
         FIG. 1  shows the dome module in perspective in a diagonal view from above; 
         FIG. 2  shows a perspective view from below on the floor of the dome module; 
         FIG. 3  shows a view from below on the floor in retracted state of the floor head parts; 
         FIG. 4  shows a view in accordance with  FIG. 3 , however in extended state of the floor head parts; 
         FIG. 5  shows a perspective lateral view. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The dome module, which is labeled  1 , comprises the U-shaped constructed bellows  2  with the bumper  3  arranged on the front side. The floor of the dome module is labeled  10 . The floor  10  comprises a stationary floor section  11  and the floor head part  20 . The subject matter of the invention is now the horizontal displaceability of the floor head parts  20  relative to the stationary floor section  11 . In this connection, for the following discussions reference is made to the drawings in accordance with  FIG. 2 . 
     From  FIG. 2  in this connection under the stationary floor section  11  a framework construction arises, which holds the pulling device, labeled  12 . The pulling device labeled  12  comprises the tubular motor drive  13  with the two spring-loaded rollers  13   a  on the tube of the tubular motor drive. The motor of the drive is located in the tube and is in this respect not visible. 
     Each spring-loaded roller has a strap  15  assigned to it, said strap being connected to the flexible buffer cross-beam  21 , as arises in particular also from  FIG. 2 . In addition, on the underside of the floor section  11  two gas springs  16 ,  17  are fastened, which are arranged in articulate manner with their one end to the flexible buffer cross beam  21 . The gas springs are variable in length and exhibit to this extent a varying extraction width. Guide elements  18 ,  18   a  and  18   b  are provided for the guiding of the flexible buffer cross-beam  21 . Guide element  18  is constructed as a rectangular tube which is guided into corresponding guide receptacles  19  on the underside of the floor section  11 , as likewise arises in view of  FIG. 2 . Guide elements  18   a  and  18   b  are constructed as round bars which are displaceably guided in corresponding receptacles  19   a  and  19   b  within the frame of the floor. 
     The buffer cross-beam  21  is constructed elastically resilient over the longitudinal section X, e.g. by using a spring steel. It is mentioned here that the invention also comprises a buffer cross-beam  21  which is constructed elastically resilient over its entire length. The buffer cross-beam  21  exhibits the bumper  22  on its front. 
     On the top of the buffer cross-beam  21  there are, as arises already in the view of  FIG. 1 , several floor segments  23 ,  24 ,  25 ,  26  and  27 , which form the floor head part  20 . The pivotable linking of floor segments  23  through  26  to the buffer cross-beam takes place via axes  23   a  through  26   a . That means floor segments  23  through  26  are moveably held around these axes  23   a  through  26   a  by the buffer cross-beam  21 , which is necessary when the buffer cross-beam is supposed to swing out over its length X in the direction of the arrow  40 . 
     As can be gathered from the drawings and in particular here from  FIG. 5 , the individual floor segments  23  through  26  are held vertically offset to one another on a rotating basis on the buffer cross-beam by the respective axes  23   a  through  26   a . That means that the individual floor segments  23  through  26  can be moved relative to one another one the plane against one another, as is required when the buffer cross-beam swings out in the direction of the arrow  40  and the floor segments  23  through  26  move to one another to this extent in the front region of the crass-beam. In the starting position, as shown in  FIG. 3 , the individual floor segments are mounted overlapping on their rear ends. In the case of the outgoing movement this overlapping partially peters out, but is always preserved with a specified amount. 
     In the present case the floor segment  27  essentially does not pivot outward, wherein however reference is once more made to the fact that floor segment  27  can also be subdivided into further partial segments if this is necessary corresponding to the airplane type for a gap-free contact of the floor to the outer contour of the airplane. 
     The floor segments, which can be rotated, are mounted horizontally moveable under the stationary floor section, in order to preclude the development of any gaps in the floor in the case of an outward pivoting movement ( FIG. 3 ,  FIG. 4 ). 
     The following procedure is employed for the placement of the buffer cross-beam. If the floor is still at somewhat of a distance from the airplane fuselage, the floor head part  20  is folded out first in the direction of the airplane fuselage, thus horizontally. The maximum outgoing path over the entire width of the floor is predefined by the size of the smallest gas spring  17 . The outgoing path of gas spring  16  is longer, wherein in this respect a contour conformal placement of the buffer cross beam is possible. In the case of extension the strap forms a reserve in the region of the shortest gas spring which is held by the spring-loaded roller. 
     The pulling device with the two straps is used to retract the floor head parts. The tubular motor runs until also strap  15  in the region of the longer gas spring  16  has completely rolled up on the spring-loaded roller  13   a . The spring of the spring-loaded roller  13   a  in the region of gas spring  17  is then tight after adjustment of the gas spring. The “reserve” of springs formed in this connection then ensures that in the rotation of the tubular motor strap  15  the spring-loaded roller  13   a  does not sag when gas spring  16  reaches its end position.