Abstract:
A structure of a trailer bed having a lower level trailer bed and an upper level trailer rack, wherein two sides of the lower level trailer bed utilize parallel pillars as support, the top end of the pillar is mounted with a substantially horizontal upper level trailer rack, the end of the lower level trailer bed is mounted with an elevating/retracting plate allowing a carrier car to going in and out, the upper level trailer rack is pivotally mounted with an elevating/retracting trailer bed module, and the height of the trailer bed is adjustable for ferrying various type of vehicles onto the trailer bed so as to provide safety in the course of transporting.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     (a) Technical Field of the Invention  
         [0002]     The present invention relates to a trailer bed, and in particular, the height of the trailer bed being adjustable for ferrying various type of vehicles onto the trailer bed so as to provide safety in the course of transporting.  
         [0003]     (b) Description of the Prior Art  
         [0004]     Generally new vehicles such as saloon cars, prior to being legally allowed to drive on a road, are loaded onto a trailer bed for transporting to either a show room or a designated site. Due to the fact that there are various car types and car shapes, a trailer bed may only be suitable for use in transporting a certain size car. As for the type of car, a different trailer bed may have to be designed. However, in order to save cost in ferrying these cars, it is very often that a trailer bed, which is only suitable for use carrying smaller cars, may be used to ferry larger size cars. Accordingly, this is unsafe and the number of cars to be transported is very limited.  
         [0005]     Accordingly, it is an object of the present invention to provide an improved structure of a trailer bed which allows more cars to be transported and the trailer bed can be used to transport cars of different sizes.  
       SUMMARY OF THE INVENTION  
       [0006]     The primary purpose of the present invention is to provide an improved structure of a trailer bed having a lower level trailer bed and an upper level trailer rack. The two sides of the lower level trailer bed utilizes parallel pillars as support, the top end of the pillar is mounted with the substantially horizontal upper level trailer rack, and the end of the lower level trailer bed is mounted with an elevating/retracting plate allowing a carrier car to go in and out. The upper level trailer rack is pivotally mounted with an elevating/retracting trailer bed module; the lower level trailer plate is provided with a relatively higher front section trailer plate, and the middle section of the lower level trailer plate adjacent to the front section trailer plate is pivotally provided with a sloping passage, and the two sides of the front end of the sloping passage corresponding to the pillars being a retractable shaft module, and the front section of the sloping passage corresponding to the retractable shaft module is a securing valve module; the front section of the upper level trailer rack is protruded with an upper level front rack corresponding to the front section trailer plate of the lower level trailer plate and the upper level trailer rack and the upper level front rack respectively mounted with an elevating/retracting trailer plate module and a front elevating/retracting trailer plate, wherein the two ends of the front elevating/retracting trailer plate respectively utilize the corresponding pillars mounted to the first and second elevating/retracting module; and the elevating/retracting trailer plate includes the first elevating/retracting trailer plate and the second elevating/retracting trailer plate, and the first elevating/retracting trailer plate is mounted at the upper level trailer rack adjacent to the front section of the upper level front rack, and the two end of the first elevating/retracting trailer plate respectively utilizes the pillars mounted to the two sides of the third and forth elevating/retracting module, and the second elevating/retracting trailer plate is provided at the rear section of the upper level trailer rack, and the two ends of the second elevating/retracting trailer plate utilizes the pillar mounted to the two sides of the fifth and sixth elevating/retracting module, and the end of the second elevating/retracting trailer plate is inclined downward to urge the top face of the lower level trailer plate to allow transported cars to enter in or out of the upper level trailer rack.  
         [0007]     Still a further object of the present invention is to provide an improved structure of a trailer bed, wherein the first elevating/retracting module corresponding to one side of the pillar is an extractable shaft having both ends thereof mounted between the front section trailer plate and the front elevating/retracting trailer plate, and one side of the retractable shaft is perpendicularly mounted with a guiding shaft having a plurality of positioning holes, and the top end of the retractable shaft is mounted with a securing valve on the guiding shaft by means of a sliding mount and the second elevating/retracting module is provided with a first retractable shaft between the front section trailer plate and another end of the front elevating/retracting trailer plate, and the inner face of the pillar is a guiding rail having corresponding holes for the insertion positioning of an insertion rod so that the front elevating/retracting trailer plate uses the first and second elevating/retracting module to proceed with corresponding up and down sliding movement of the upper level.  
         [0008]     Yet still another object of the present invention is to provide an improved structure of a trailer bed, wherein the third elevating/retracting module is provided with a horizontal shaft between the two sides of the pillar, and the first elevating/retracting trailer plate is pivotally mounted to the horizontal shaft and the two sides of the pillar is an extendable shaft urging the horizontal shaft, and the bottom face of the horizontal shaft is a guiding shaft parallel to the extendable shaft and the guiding shaft is provided with a plurality of equidistant holes, and the middle section of the extendable shaft is a securing valve having a sliding mount, and the guiding shaft is mounted to the sliding mount, and the forth elevating/retracting module pivotally mounts the bottom end of the extendable shaft to the lower level trailer plate, and the other end of the extendable shaft is positioned to the middle section of the two sides of the elevating/retracting trailer plate, and one side of the extendable shaft is mounted in parallel to a guiding shaft with corresponding positioning holes, and the positioning holes are of equal height with that of the guiding shaft of the third elevating/retracting module, and the top end of the extendable shaft is provided with a securing valve using the sliding mount to mount onto the guiding shaft, and the first elevating/retracting trailer plate uses the third, and the forth elevating/retracting module to pivotally rotate or incline in accordance with the upper level trailer rack.  
         [0009]     A further object of the present invention is to provide an improved structure of a trailer bed, wherein the fifth elevating/retracting module has a horizontal shaft positioned between the pillars, and the second elevating/retracting trailer plate is correspondingly and pivotally mounted to the horizontal shaft, and the two sides of the pillar is provided with an extendable shaft having an urging horizontal shaft and the bottom face of the horizontal shaft is a guiding shaft parallel to the extendable shaft, and the guiding shaft is provided with a plurality of equidistant positioning holes, and the middle section of the extendable shaft is a securing valve having a sliding mount, and the sixth elevating/retracting module pivotally mounts the bottom end of the first extendable shaft to the lower level trailer plate, and the other end of the extendable shaft is inclined at the middle section of the side of the section elevating/retracting trailer plate, and the pillar corresponding to the rear section of the two sides of the second elevating/retracting trailer plate is a guiding rail having corresponding positioning holes, and the positioning holes are of same height with that of the guiding shaft of the fifth elevating/retracting module, and the second elevating/retracting trailer plate corresponding to the guiding rail is a positioning valve such that the second elevating/retracting trailer plate utilizes the fifth and sixth elevating/retracting module to incline or pivotally move in accordance with the upper level trailer rack.  
         [0010]     Yet a further object of the present invention is to provide an improved structure of a trailer bed, wherein the top end of the extendable shaft of the sixth elevating/retracting module at the two sides of the second elevating/retracting trailer plate is provided with a guiding plate, and the two guiding plates are respectively mounted to the sliding slot shaft, and the two sliding slot shafts are perpendicularly mounted between the lower trailer plate and the upper level trailer rack so as to keep stable.  
         [0011]     The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.  
         [0012]     Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.  
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0013]      FIG. 1  is a schematic view of an improved structure of a trailer bed of the present invention.  
         [0014]      FIG. 2  is a schematic view showing the actual application of the improved structure of a trailer bed of the present invention.  
         [0015]      FIG. 3  is a perspective view showing the sloping path of the improved structure of a trailer bed of the present invention.  
         [0016]      FIG. 4  is a perspective view showing the front elevating bed module of the present invention.  
         [0017]      FIG. 5  is a perspective view showing the lowering bed module of the present invention.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0018]     The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.  
         [0019]     Referring to  FIGS. 1 and 2 , there is shown an improved structure of a trailer bed having a lower level trailer plate  10  with an upright pillar at the sides thereof as support. The top end of the individual pillar  12  is provided with a substantially horizontal upper level trailer rack  30 . The end terminal of the lower level trailer plate is a retractable trailer plate  15  which allows vehicles for transporting to go up and down from the trailer. The upper level trailer rack  30  is pivotally mounted with an elevating/lowering trailer plate module  50  which can urge the top face of the lower level trailer plate  10 . This structure will facilitate the entering and existing of vehicle.  
         [0020]     As shown in  FIGS. 1, 2  and  3 , the lower level trailer plate  10 , corresponding to one end of the trailer, is a higher front section trailer plate  11  so as to avoid the front wheel of the trailer and to increase the capacity of the trailer. The middle section of the lower level trailer plate  10 , adjacent to the front section trailer plate  11 , is pivotally mounted with a sloping passage  20 . A retractable shaft module  21  is provided between the two sides of the front end of the sloping passage  20  and the corresponding pillar  12  so that the retractable shaft module  21  provides the elevation and lowering (as shown in  FIG. 3 ) of the sloping passage  20 . The front section of the sloping passage  20  corresponding to the retractable shaft module  21  is provided with a securing valve module  25  at the pivotal position. The securing valve module  25  is for the engagement of the end face of the front section trailer plate  11  with the lower level trailer plate  10 . Thus, the securing of the sloping passage  20  is stable and the sloping passage  20  will not be dislocated and vehicles could enter into and exist from the front section trailer plate  11 .  
         [0021]     Referring to  FIGS. 1, 4  and  5 , the front section of the upper level trailer rack  30  is an upper level front rack  35  corresponding to the front section trailer plate  11  of the lower level trailer plate  10 . On the upper level trailer rack  30  and the upper level front rack  35 , an elevating/lowering trailer plate module  50  and a front elevating/lowering trailer plate  40  are provided. The two ends of the front elevating/lowering trailer plate  40  are provided with two pillars by means of the first and the second elevating/lowering module  41 ,  45 . The first elevating/lowering module corresponding to one side of the pillar  12 , is a retractable shaft  42 . The two ends of the retractable shaft  42  are respectively mounted between the front section trailer plate  11  and the front elevating/lowering trailer plate  40 , and one side of the retractable shaft  42  is mounted with a parallel guiding shaft  43 . The upper section of the guiding shaft  43  is provided with equal spaced positioning holes  430 . The top end of the retractable shaft  42  has a securing valve  44  which is provided on the guiding shaft by means of the sliding mount  440 . The securing valve  44  is corresponding to the positioning hole  430  to provide a positioning function. Between the front section trailer plate  11  and the front elevating/lowering trailer plate  40 , an extractable shaft  46  is provided and the inner face of the corresponding pillar, a guiding rail  47  is provided. One side of the guiding rail  47  is provided with equal distance positioning holes  470 , and the positioning hole  470  has the same height and distance from the positioning hole  430  allowing an insertion rod  48  to be inserted and secured and the front elevating/lowering trailer plate  40  makes use of the first and second elevating/lowering module  41 ,  45  to correspond to the movement of the upper level front rack  35 .  
         [0022]     As shown in  FIG. 5 , the elevating/lowering trailer module  50  includes a first elevating/lowering trailer plate  60  and a second elevating/lowering trailer plate  70 . The first elevating/lowering trailer plate  60  is at the upper level trailer rack  30 , adjacent to the front section of the upper level front rack  35 . The two end of the first elevating/lowering trailer plate  60  employs the third and forth elevating/lowering module  61 ,  66  to mount onto the pillar  12  on a slide. The third elevating/lowering module  61  is at the sides of the pillar  12  which has a horizontal shaft  62  across. The corresponding end of the first elevating/lowering trailer plate  60  is pivotally mounted to the horizontal shaft  62  and the first elevating/lowering trailer plate  60  is inclined downward so as to shorten the length of the loading vehicles onto the trailer. The two sides of the pillar  12  is a retractable shaft  63  having two ends mounted between the lower level trailer plate and the horizontal shaft  62 , and the bottom face of the horizontal shaft  62  is a guiding shat  64  parallel to the retractable shaft  63 . The guiding shaft  64  has a plurality of positioning holes  640  which are of equal distance from each other. The middle section of the retractable shaft  63  is a securing valve  65  provided with a sliding mount  650  and the guiding shaft  64  is mounted at the sliding mount  650 . A positioning hole  640  on the guiding shaft  64  provides positioning purpose. At the forth elevating/lowering module  66 , the bottom end of the retractable shaft  67  is provided onto the lower level trailer plate  10 . The other end is at the two sides of the middle section and one side of the retractable shaft  67  is a guiding shaft  68  in parallel. The upper section of the guiding shaft  68  has equal distance positioning holes  680 . The positioning hole  680  and the positioning hole  640  of the guiding shaft  64  are equal distance and of same height. The top end of the retractable shaft  67  makes use of the sliding mount  690  to mount onto the securing valve  69  so that the securing valve  69  is corresponding to the positioning hole  680 . The first elevating/lowering trailer plate  60  makes use of the third and forth elevating/lowering module  61 ,  66  to correspond to the up and down sliding movement or inclination of the upper level trailer rack  30 .  
         [0023]     The second trailer plate  70  is mounted to the rear section of the upper level trailer rack  30  and the two ends of the elevating/lowering trailer plate  70  are provided with two pillars  12  by means of the fifth and the sixth elevating/lowering module  71 ,  76 . The fifth elevating/lowering module  71  has a horizontal shaft  72  across the two pillars  12 , and the corresponding end section of the second elevating/lowering trailer plate  70  is pivotally mounted with a horizontal shaft  72 , so that the other end of the second elevating/lowering trailer plate  70  can be downwardly inclined to urge the lower level trailer plate  10  to allow the vehicles to enter and exist the upper level trailer rack  30 . In between the sides of the pillars  12 , there is a retractable shaft  73  having two ends mounted to the lower level trailer plate  10  and the horizontal shaft  72 , and the bottom face of the horizontal shaft  72  is provided with a guiding shaft  74  which is parallel to the retractable shaft  73 . There is a plurality of positioning holes  740  on the guiding shaft  74 . The middle section of the retractable shaft  73  is a securing valve  75  having a sliding mount  750 . The guiding shaft  74  is mounted to the sliding mount  750 , and the securing valve  75  is used to mount on the guiding shaft  74  at the positioning hole  740 . The sixth elevating/lowering module  76  mounts the bottom end of the second elevating/lowering shaft  77  to the lower level trailer plate  10 , and the other end is inclined at the middle section of the second elevating/lowering trailer plate  70 . The top end of the retractable shaft  77  at the two sides of the second elevating/lowering trailer plate  70  is protruded with a guiding plate  770 , and the two guiding plates  770  are respectively mounted within the sliding shaft  771 . The sliding shafts  771  are perpendicularly mounted between the lower level trailer plate  10  and the upper level trailer rack  30  so as to provide balancing. The pillars  12  are provided with a guiding rail  78  and the wall of the guiding rail  78  has a plurality of positioning holes  780 . The positioning holes  780  and the positioning hole  740  are of same height. The second elevating/lowering trailer plate  70  corresponding to the guiding rail  78  has a securing valve  79  to provide securing at the positioning hole  780  so that the elevating/lowering trailer plate  70  make use of the fifth and sixth elevating/lowering module to move in accordance with the up down movement of the upper level trailer rack  30  and the sixth elevating/lowering module  76  is used for the inclination of the second elevating/lowering trailer plate  70 .  
         [0024]     As shown in  FIGS. 1 and 2 , when vehicles are to be transported. The elevating and lowering trailer plate  15  is lowered, and the securing valve  79  of the sixth elevating/lowering module  76  is retracted, so that the rear end of the second elevating/lowering trailer plate  70  is separated from the upper level trailer rack  30 , and the retractable shaft  77  is retracted. The second elevating/lowering trailer plate  70  is inclined to the horizontal shaft  72 , and the guiding plate  770  at the top end of the retractable shaft  77  slides within the sliding shaft  771  so as to keep balance, and the end of the second elevating/lowering trailer plate  70  to urge the trop face of the lower level trailer plate  10  to allow vehicle to move upward to the front elevating/lowering trailer plate  40  and the second and first elevating/lowering trailer plates  60 ,  70 . The retractable shaft  77  of the second elevating/lowering trailer plate  70  is protruded so that the second elevating/lowering trailer plate maintains horizontal, and the securing valve  79  causes the second elevating/lowering trailer plate  70  to be mounted to the guiding rail  78 . Thus, the vehicles are loaded onto the upper level trailer rack  30 .  
         [0025]     The sloping passage  20  is upward inclined by means of the retractable shaft module  21  and the securing valve  25  is used to locked the movement to allow vehicles to enter the front section trailer plate  11  of the lower level trailer plate  10 . Next the sloping passage  20  is lowered and other vehicles can enter at the lower level trailer pate  10 , and the lowering and elevating trailer plate  15  is retracted.  
         [0026]     When the height of the vehicles to be transported at the upper level trailer rack  30  is high, then the first and the second elevating/lowering module  41 ,  45 , the third and the forth elevating/lowering module  61 ,  66  and the sixth and the fifth elevating/lowering module  71 ,  76  are retracted at the same height so that the front elevating/lowering trailer plate  40 , the first elevating/lowering trailer plate  60  or the second elevating/lowering trailer plate  70  can be retracted horizontally so that the center of gravity of the transported vehicle is lowered.  
         [0027]     It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.  
         [0028]     While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.