Abstract:
The present invention provides a chart chassis composed of a front and a rear cart frameworks bridged together, while the releasing and assembling mechanism comprises a handle bar, a turnable member and a joint assembly. By pulling the handle bar to turn the turnable member outwards, and separating the joint assembly from the turnable member thereby performing instant detachment of the cart chassis.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to releasably attached cart chassis, and more particularly, to a chassis of an electric chart constructed such that it can be conveniently detached and re-assembled. 
     2. Description of the Prior Art 
     For the convenience of storing or transporting, an electric cart is usually constructed such that it is releasable in several portions so as to minimize its size, the releasable portions are, for example, the steering wheel, the seat, and the chassis etc., among them releasing the chassis is most effective in reducing the size of a cart. 
     Generally, the chassis of an electric cart is composed of a front cart framework and a rear cart framework, the two frameworks are engaged with a plurality of screw bolts and nuts so that a set of auxiliary hand tools arc necessary for releasing and re-assembling the chassis by loosening and tightening those screw elements therefore causing the following shortcomings: 
     1. A lot of screw fixing elements used for engagement causes time consuming releasing and re-assembling work. 
     2. A set of auxiliary hand tools are necessary to be carried along with the detached cart during transportation in order to re-assemble it when it arrives at the destination, which is quite bothersome and inconvenient. 
     SUMMARY OF THE INVENTION 
     Aiming at the above depicted disadvantages, the present invention is to propose a newly developed construction of releasably attached cart chassis capable of conveniently and effectively assembling or detaching. 
     It is another object of the present invention to provide a releasably attached cart chassis which can be firmly assembled without using auxiliary hand tools. 
     For achieving the above mentioned object, the present invention provides a cart chassis composed of a front cart framework and a rear cart framework bridged together, while the releasing and assembling mechanism comprises a handle bar, a turnable member and a joint assembly. By pulling the handle bar to turn the turnable member outwards, and separating the joint assembly from the turnable member thereby performing instant detachment of the cart chassis. 
     For fuller understanding of the nature and objects of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a three dimensional perspective view of a cart with releasably attached cart chassis of the present invention; 
     FIG. 2 is an exploded view showing each component of the present invention; 
     FIG. 3 is an assembled three dimensional view of the present invention; 
     FIG. 4 is a view showing that the front and the rear cart frameworks are engaged together by the turnable member and the joint assembly; 
     FIG. 5 is a view showing that the rear cart framework is on the way of being detached from the front cart framework; and 
     FIG. 6 is a view showing that the front and the rear cart frameworks are completely separated from each other. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to FIGS  1  through  3 , the cart chassis of the present invention is composed of a front cart framework  10  and a rear cart framework  20  bridged together, whereas the releasable attachment mechanism comprises a handle bar  30 , a turnable member  40 , a fixing pin  50 , and a joint assembly  60 . 
     The front cart framework  10  has a base plate  11 , the base plate  11  has two end supporting brackets  12  each formed into a top opened arcuate shape. A post  13  stands on the base plate  11  at the position between two supporting brackets  12 . The post  13  is conjoined to and supports a detachable seat  70  thereon and has two parallel tail fins  14  extending backwards each equipped with a hinge hole  141 , a first insertion hole  142 , and a first recessed slot  143  with an opening directed backwards. There is further provided with a first hook eye  15  on the side surface of the post  13 . 
     The rear cart framework  20  has a round connecting rod  21  lying in the transverse direction of the cart chassis with its two ends resting on the two supporting brackets  12 . The two skid protrusions  22  stretched horizontally forwards are used to urge against the bottom surface of the base plate  11  for preventing relative turning of the two cart frameworks  10  and  20  when they are mutually coupled together. Incidentally, an extension adapter  23  having two parallel plates  231  is fitted at the middle of the connecting rod  23 . Each plate  231  has an eyelet. 
     The handle bar  30  is a L shaped bar having a grip portion  31  and a crossed portion  32 . The crossed portion  32  is inserted into the hinge holes  141  of both tail fins  14  such that the handle bar  30  is turnable thereof. 
     The turnable member  40  is disposed between the two tail fins  14 . The turnable member  40  is formed of a junction block  41  and two flaps  42 . The junction block  41  has a through hole  411  for the crossed portion  32  of the handle bar  30  to tunnel through and is fixed thereat. Each flap  42  has a second insertion hole  421  aligned to the first insertion hole  142 , and a second recessed slot  422  whose opening is directed downward so that the first recessed slot  143  and the second recessed slot  422  are mated with each other to form a round confinement space when the front and the second cart frameworks  10  and  20  are coupled together. 
     Meanwhile, a second hook eye  43  is formed on one of the flap  42 , and a coil spring  44  is hooked its two ends respectively on the first and the second hook eyes  15 ,  43  thereby causing the turnable member  40  only able to swing to one side. 
     The fixing pin  50 , formed into a slender cylindrical shape and tunneling through the first and the second insertion holes  142 ,  421 , has a steel ball  51  inlaid in its end thereof. The steel ball  51  is urged by a spring (not shown) and slightly emerging from the side surface of the fixing pin  50 . When the fixing pin  50  conjoins the tail fins  14  and the turning member  40  together, the turning member  40  is tightly confined between the two tail fins  14  with the aid of the steel ball  51  strongly urging on the outer surface of one of the tail fins  14  without the fear of loosening. 
     The joint assembly  60  includes a stopper pin  61 , a screw bolt  62 , a nut collar  63 , a vibration damper spring  64 , and a hinged joint  65  provided at the bottom of the nut collar  63 . 
     The stopper pin  61  is transversely penetrating through the top portion  621  of the screw bolt  62 , and its two ends are settled in the second recessed slots  422  so that when the two pairs of recessed slots  143  and  422 , are coupled together the stopper pin  61  is stably confined in the confinement space formed therebetween. The threaded portion  622  of the screw bolt  62  is engaged to a screw hole  631  formed in the nut collar  63 , and the spring  64  is clad over the nut collar  63  with its top end urging against a flat bottom surface  632  of the nut collar  63 . 
     Meanwhile, the hinged joint  65  is formed into a through hole for a screw pin  66  to pass therethrough and the eyelet  232  of the adapter  23  as well, and then is tightened with a nut  67  so as to reliably combine the front and the rear cart frameworks  10  and  20  together by means of the hinged joint  65  and the stopper pin  61  as shown in FIG.  4 . 
     Now, the operation procedures of detaching and assembling the chassis will be illustrated hereinafter 
     As shown in FIG. 4, the two cart frameworks  10  and  20  are combined together where the grip portion  31  of the handle bar  30  is horizontally disposed and the fixing pin  50  is tunneling through the first and the second insertion holes  142  and  421  thereby firmly sandwiching the turning member  40  between two fins  14 . In addition, the chassis is further stably assembled because vibration force which is transferred from the front cart framework  10  is absorbed by the vibration damper spring  64 . 
     Referring to FIG. 5, in releasing the attachment between the two cart frameworks  10  and  20 , at first, extracting the fixing pin  50 , and turning down the grip portion  31  with respect to the hinged joint  65  as a center of rotation and depending on the connecting rod  21  as a supporter. At this moment the turnable member  40  which follows the movement of the handle bar  30 , turns outwards and upwards with respect to the center axis passing the through hole  411  of the junction block  41 , and simultaneously, the second recessed slot  422  of the turnable member  40  displaces along with the stopper pin  61  of the joint assembly  60 , finally, by extracting the stopper pin  61  from the second recessed slot  422 , the front and the rear cart frameworks  10  and  20  will be easily separated as shown in FIG.  6 . 
     Assembling of the two car frameworks  10  and  20  may be executed by steps in reversed order described above. 
     After having finished reading over the above detailed description of the present invention, one may clearly understand that the present invention has several features which are distinctly superior to any other conventional technique, and are as follows: 
     1. In assembling the chassis of the present invention, no additionally provided connecting or linking components such as screw bolts and nuts are required. 
     2. In releasing the chassis of the present invention, no auxiliary hand tools are required. 
     3. By adjusting the insertion depth of the screw bolt  62  in the nut collar  63 , the vibration damping effect of the spring  64  can be predetermined at a desired degree. 
     Those who are skilled in the art will readily perceive how to modify the invention. Therefore, the appended claims are to be construed to cover all equivalent structures which fall within the true scope and spirit of the invention.