Abstract:
The complex trailer can be coupled to a vehicle having a drawing rack and mainly comprises a first trailer and a second trailer, in which the first trailer includes a deck, a bogie wheel, and a landing; the second trailer includes a wagon bed, and a trailing wheel. The complex trailer also has three coupling devices for respectively coupling the drawing rack and the first trailer, and the first trailer and the second trailer. Moreover, the trailing wheels can take the place of the landing wheels and the wagon bed can be combined with and thereby carried by the first trailer in case the first trailer and the second trailer are combined together so as to save space and to provide stable travel.

Description:
BACKGROUND OF THIS INVENTION 
     1. Field of the Invention 
     This invention relates to a carrier for hauling articles, and in particular, to a complex trailer adapted to be drawn by a vehicle and having two compartments allowing for individual or combined use. 
     2. Related Art of the Invention 
     For an outdoor car wash, supplies such as water, electric power, a large water tank, a generator, an air compressor, a vacuum cleaner, and various tools and materials are necessary, and a mid-sized car can be used to carry such supplies. However, for a narrow street or a crowded area, such a car is inconvenient due to its size. Moreover, in case such supplies are gathered in one car, parts of supplies will be difficult to be shifted to a different location and thus its utility is relatively low. On the other hand, if parts of such items are separately carried by different smaller vehicles, a number of vehicles are necessary and a larger waste of energy as well as a greater occupation of space will occur. This invention is thus submitted to overcome the above problem. 
     SUMMARY OF THIS INVENTION 
     A primary object of this invention is to provide a complex trailer which can be drawn by a vehicle and is easy to be combined and separated. 
     Another object of this invention is to provide a movable carrier suitable to be drawn by a vehicle and travel a narrow street with a heavy load. 
     The other object of this invention is to provide a carrier which is fuel-efficient, easily portable and suitable for long distance transportation with a vehicle or for a short distance pushed by hand. 
     Yet another object of this invention is to provide a carrier which has a large compartment and a well-engineered design. 
     To achieve the above objects, a complex trailer adapted to be drawn by a vehicle having a drawing rack comprises a first trailer including a deck having a front end and a rear end, a beveled bucket mounted on the deck, at least one bogie wheel mounted on the front end of the deck, and a rear movable landing means mounted under the deck adjacent to the rear end thereof, the landing means having at least two landing wheels such that the first trailer is substantially supported by the bogie wheel and the landing wheels; a second trailer including a wagon bed which has two opposite sides, an upper end and a lower end, and a trailing wheel means which is mounted on one of the sides of the wagon bed and has two trailing wheels and at least one axle rod supporting the two trailing wheels; a first coupling means for releasably coupling the drawing rack and the first trailer; a second coupling means for releasably coupling the first trailer and the trailing wheel means in case the rear end of the deck is supported by the trailing wheels instead of the landing wheels; and a third coupling means for releasably coupling the upper end of the wagon bed and the first trailer. 
     By means of the above structure, each trailer of this invention provides a large loading space owing to the absence of an engine in each trailer. Moreover, the first trailer can provide a large loading capacity and the second trailer can effect a save of labor and time. During a pause in moving, the wagon bed of the second trailer could be unloaded from the first trailer and thus reduce the load of the first trailer. 
     The other objects, functions, and effects of this invention will be apparent by means of the following detailed description. However, the detailed description and its concrete embodiments are directed to a preferred embodiment; various modifications and variants in the spirit and scope of this invention being apparent to persons skilled in the art, and thus it would be merely an example for description. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a top view of the complex trailer according to this invention in which each main part is separated. 
     FIG. 2 is a side view of the complex trailer according to this invention in which each main part is separated. 
     FIG. 3 is a side view of the complex trailer according to this invention in which the first trailer and the second trailer are primarily coupled together. 
     FIG. 4 is a side view of the complex trailer according to this invention in which the first trailer and the second trailer are completely coupled together. 
     FIG. 5 is a top view showing the assembled status of the cycle and the drawing rack. 
     FIG. 6 is a side view showing another assembly style of the cycle and the complex trailer of this invention. 
     FIG. 7 is a side view showing an application of the complex trailer of this invention to carry necessities for car-washing. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     In the following, a concrete embodiment of the complex trailer according to this invention is described with reference to the drawings. 
     As shown in FIGS. 1 and 2, the complex trailer according to this invention mainly comprises a first trailer  2  and a second trailer  3 , and is especially suitable to be used with a motorcycle  1 , which is provided with a drawing rack  12  for drawing either the first trailer  2  or the second trailer  3 . Moreover, there is provided a first coupling means for coupling the drawing rack  12  and the first trailer  2 , a second coupling means for coupling, at one location, the first trailer  2  and the second trailer  3 , and a third coupling means for coupling, at another location, the second trailer  3  and the first trailer  2 , as well as a toggle linkage  26  disposed between the first trailer  2  and the third coupling means. Each of these coupling means consists of a male and a female joint respectively located where the two parts are to be coupled. In detail, the first coupling means includes a collar  124 , serving as a female joint, provided in the drawing rack  12 , and a kingpin  23 , serving as a male joint, provided in the first trailer  2 . The second coupling means includes a hook  242 , serving as a female joint, provided in the first trailer  2 , and an axle rod  34 , serving as a male joint, provided in the second trailer  3 . The third coupling means includes a collar  261 , serving as a female joint, provided at one free end of the toggle arm  26 , and a kingpin  33 , serving as a male joint, provided in the second trailer  3 . 
     The first trailer  2  mainly comprises a deck  21  having a front end and a rear end, a beveled bucket  25  mounted above the deck  21 , a bogie wheel  22  mounted under the front end of the deck  21 , and a rear landing means  24  mounted under the rear end of the deck  21 . The kingpin  23 , serving as a male joint of the first coupling means, is provided above the bogie wheel  22  and combined therewith. However, as a variant it can also be provided on an upper portion of the beveled bucket  25 . The rear landing means  24  comprises a pair of supporting legs  244  centrally pivoted onto two sides of the deck  21 , a pair of landing wheels  241  mounted at one end of the supporting legs  244 , and a pair of retractable braces  243  mounted between the deck  21  and one end of the supporting legs  244 . Moreover, there is a hook  242 , serving as a female joint of the second coupling means, provided at the other end of each supporting leg  244 . The retractable brace  243  in this embodiment is constructed by a stay damper. However, it can also be constructed by a hinge type strut consisting of two arm sections. Furthermore, the rear end of the deck  21  is shaped as a dovetail for allowing the smooth insertion of an axle rod  34  of the second trailer  3  into a position to be coupled. 
     The second trailer  3  includes a wagon bed  31 , a trailing wheel means  36  mounted on one side of the wagon bed  31 , and two inserting blades  32  perpendicularly extending on the other side of the wagon bed  31 . The trailing wheel means  36  includes a pair of wheels  361 , an axle rod  34  supporting the two wheels  361 , and a pushing rod  35  parallel to the axle rod  34  for pushing the supporting legs  244  into an off-landing status in case the second trailer  3  is coupled to the first trailer  2 . Moreover, when the second trailer  3  is not coupled to the first trailer  2 , it can stand alone by means of a lower end of the wagon bed  31  and the two trailing wheels  361 . 
     The toggle arm  26  has a fixed end mounted on the upper portion of the beveled bucket  25 , and a free end incorporated with a collar  261 , serving as a female joint of the third coupling means, for pulling and positioning an upper end of the wagon bed  31  of the second trailer  3  to a position of being supported by the beveled bucket  25  of the first trailer  2 . As a variant, the toggle arm  26  can be actuated by a hydraulic cylinder  262  in cooperation with a hydraulic mechanism (not shown). 
     As shown in FIG. 5, the drawing rack  12  is U-shaped and is provided with a collar  124  at its returning end for coupling with the kingpin  23  provided on the first trailer  2  or the kingpin  33  provided on the second trailer  3 . The opening ends of the U-shaped rack  12  are provided with telescopic sockets  121  to be mounted onto the rear axle  111  of a rear wheel  11  of the motorcycle  1 . The telescopic socket  121  is mounted onto the axle  111  via a hollow joint  122  provided with female threads thereinside. A pin  123  is provided for penetrating the axle and the joint  122  so as to lock the coupling between the rear axle  111  and the drawing rack  12 . However, the drawing rack  12  can also be fixed in another part of the motorcycle  1  in a variant. 
     FIGS. 3 and 4 shows an assembly with respect to the first and the second trailers  2  and  3 . As shown in FIG. 3, initially, in case the second trailer  3  is to be assembled to the first trailer  2 , it is pushed toward the rear portion of the first trailer  2  and the axle rod  34  slides under the deck  21 . In line with the arrival of the axle rod  34  at a position to be coupled by the hook  242 , the pushing rod  35  will push the supporting legs  244  to elevate the landing wheels  241  from the ground and the deck  21  will be supported by the trailing wheels  361  instead of the landing wheels  241 . Once the landing wheels  241  are rotated up to the deck  21 , the hooks  242  will lock the axle rod  34 . On the other hand, the toggle arm  26  could extend so as to make the collar  261  couple with the kingpin  33  provided on the second trailer  3 . 
     As shown in FIG. 4, secondly, the toggle arm  26  could be bent thoroughly so as to pull and rotate the wagon bed  31  to a location above the opening of the beveled bucket  25 . In such a case, the complex trailer of this invention is very compact and thus very suitable to be drawn along a narrow street. Besides, the toggle arm  26  can be slightly bent in as much as the lower end of the wagon bed  31  is off-landing. In such a case, an angle locking means may be necessary for the toggle arm  26 . However, if the collar  261 , i.e., the female joint of the third coupling means, is mounted on the bucket  25 , such a locking means is unnecessary. 
     FIG. 6 shows another assembly of the complex trailer of this invention, in which the second trailer  3  is directly coupled with the drawing rack  12 . That is, the collar  124 , serving as a female joint of the first coupling means, couples with the kingpin  33  of the second trailer  3 , serving as a male joint of the third coupling means. However, in such a case, as shown in FIG. 1, a bracket  125  fixed on the cycle  1  should be further provided for supporting the drawing rack  12  to be positioned in an upward inclined direction. 
     FIG. 7 shows an application of this invention to carry necessities for washing a car. For example, cleaning devices such as a vacuum cleaner  41  and a tool box  42  can be carried by the cycle  1 . A wax polish device (not shown) can be accommodated in the beveled bucket  25 . A generator or air compressor can also be accommodated in the beveled bucket  25 . A fuel tank  51  and bag storage  52  can be hung on the outside of the bucket  25 . A washing machine  6  can be carried by the second trailer  3 , which may include a water tank  61 . Thus, for long distance transportation, the complex trailer could be drawn by a cycle while for short distance transportation, each trailer could be separately and manually pushed to a job site. The efficiency of working is therefor upgraded. 
     However, the applied scope suitable for this invention is very wide, such as pesticide spraying on a fruit ranch or cropland, a fire extinguisher on a narrow street, or for road cleaning, etc. 
     Various uses of this invention are possible. For example, the female joint of the second coupling means could be located on the rear side wall of the bucket  25 . Such variants do not exceed the spirit and scope of this invention. Thus, all the variants and modifications obvious to persons in the art should be included in the appended claims.