Abstract:
A remote control model car has a rear suspension mechanism mounted in either side of the chassis. The chassis has a suspension body. The rear suspension mechanism comprises a pivotal adjustment rod coupled to the lug of the suspension body, a pivotal arm mechanism, a hub mechanism, and a shock absorber pivotably secured to the arm mechanism and the suspension body. This can effect a smooth, simple, and reliable wheel angle adjustment.

Description:
FIELD OF THE INVENTION  
         [0001]    The present invention relates to remote control model cars and mere particularly to a rear suspension mechanism for model jeep with improved characteristics  
         BACKGROUND OF THE INVENTION  
         [0002]    Conventionally, remote control model cars are classified as remote control model racing cars for planar ground or model jeeps for uneven terrain (as the subject matter of the invention) Hence, the construction of the latter is required to be more robust and capable of easily adjusting Typically, two rear wheels are driven by a drive source through a transmission mechanism. Further, a shock absorber is provided and associated with each rear wheel. Each of the front and the rear sides of wheel may be positioned at an angle with respect to ground. An offset angle is defined as the angle of rear transmission axle with respect to rear wheel in a horizontal plane. An inclined angle is defined as the angle of the surface of rear wheel with respect to a vertical plane. In general, the surface of rear wheel is inclined toward inside of model jeep for increasing the centripetal force while manipulating the model jeep.  
           [0003]    A schematic rear plan view in portion section of a conventional remote control model jeep is shown in FIG. 5. A transmission seat  17  is provided on chassis  1 . A suspension body  11  is provided adjacent transmission seat  17 . A bar on suspension body  11  is coupled to the top of hub mechanism  8 . An arm mechanism  3  under suspension body  11  is coupled to the bottom of hub mechanism  8 . A transmission rod  18  is passed through universal joint  181  and hub mechanism  8  to couple transmission seat  17  and hub  19  of wheel together. Following is a description of the adjustment of inclined angle and offset angle. As to the adjustment of inclined angle, it is required to replace a bar. Hence, it is inconvenient. As to the adjustment of offset angle, first detach a fastening block in the suspension body  11 . Then replace with a new fastening block. Fastening block is inserted through shaft coupled to suspension body  11 . Thus the angle of shaft may be adjusted. That is, the angle of shaft is determined by the positions of two end holes of fastening block, At this time, the angle of shaft is identical to that of offset angle. In view of above, the adjustment of offset angle is much more inconvenient. To the worse, the normal operation of arm mechanism  3  may be adversely affected. As a result, most users only set up the model jeep in a less precise manner. Thus such model jeep does not perform well in a difficult terrain which in turn dissatisfies an enthusiastic user.  
           [0004]    Thus, it is desirable to provide an improved rear suspension mechanism for remote control model jeep in order to overcome the above drawbacks of prior art.  
         SUMMARY OF THE INVENTION  
         [0005]    It is an object of the present invention to provide a rear suspension mechanism for a remote control model car for effecting a smooth, simple, and reliable wheel angle adjustment. Further, it is possible to adjust the distance between two rear wheels and the length of model jeep.  
           [0006]    To achieve the above and other objects, the present invention provides a remote control model car having a chassis with a rear suspension mechanism mounted in either side of the chassis, the chassis having a suspension body in the rear including a transmission seat, a coupling on either side of the transmission seat coupled to a universal joint at the internal end of a transmission rod, a lug on either side of the upper portion of the suspension body, a first ear on either side of the lower part of the suspension body, a fastening block at either front or rear side, a shaft secured bet a second ear on either side, of the fastening block, and a shaft secured between the first and the second ears, the rear suspension mechanism comprising a pivotal adjustment rod coupled to the lug of the suspension body, the adjustment rod including a center enlargement, two threaded rods on either side of the center enlargement, and two end joints such that the length of the adjustment rod is adjustable by adjusting the securing of the threaded rods and the end joints; a pivotal arm mechanism including two sleeves put on the shaft between the first and the second ears, each sleeve being abutted on one of the first and the second ears; a hub mechanism having an upper part coupled to the adjustment rod and a lower part coupled to the arm mechanism respectively, one end of the transmission rod being passed through the universal joint to couple to a joint of a pin mechanism, the other end of the pin mechanism formed as a bar passed through the hub mechanism, a bearing put on the bar of the pin mechanism, the bearing placed within the hub mechanism the bar of the pin mechanism passed through the hub mechanism, a fastener sleeved on the bar and secured to a rear wheel, a pair of parallel adjustment members at the external ends of the arm mechanism being threadedly secured to a bolt having a ball-shaped head secured in one of two fork members of the hub mechanism; and a shock absorber having a bottom end pivotably secured to an engagement member of the arm mechanism and a top end secured to the suspension body.  
           [0007]    The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0008]    [0008]FIG. 1 is a perspective exploded view of a rear suspension mechanism for a remote control model jeep according to the invention;  
         [0009]    [0009]FIG. 2 is an exploded view of the FIG. 1 model jeep;  
         [0010]    [0010]FIG. 3 is a schematic top plan view of the FIG. 1 model jeep illustrating the adjustment of offset angle;  
         [0011]    [0011]FIG. 4 is a schematic rear plan view in portion section of the FIG. 1 model jeep illustrating the adjustment of inclined angle, and  
         [0012]    [0012]FIG. 5 is a rear plan view in portion section of rear suspension mechanism for a conventional remote control model jeep. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0013]    Referring to FIGS. 1 through 4, there is shown a remote control model jeep incorporating a rear suspension mechanism in accordance with then invention. A suspension body  11  is provided in the rear of chassis  1 . A transmission seat  17  is provided in suspension body  11 . A coupling  171  on either side of transmission seat  17  is coupled to a universal joint  181  at the internal end of transmission rod  18 . A lug  12  on either side of the upper part of suspension body  11  is coupled to the internal end of adjustment rod  2 . Adjustment rod  2  has a center enlargement  22 , two threaded rods  21  on either side of center enlargement  22 , and two joints  23  and  24  on both ends. The length of adjustment rod  2  may be adjusted by adjusting the securing of the threaded rods  21  and joints  23  and  24 . A first ear  13  is provided on either side of the lower part of suspension body  11 . A second ear  15  is provided on either side of fastening block  14 , A shaft  16  is secured between first and second ears  13  and  15 . Both arm mechanism  3  and adjustment rod  2  may pivot. Two sleeves  31  of arm mechanism  3  are put on shaft  16  between ears  13  and  15 . Each sleeve  31  is abutted on ear  13  or  15 . The upper and lower parts of a hub mechanism  4  are coupled to adjustment rod  2  and arm mechanism  3  respectively. One end of a transmission rod  18  is passed through universal joint  182  to couple to a joint  191  of pin mechanism  19 . The other end of pin mechanism  19  is formed as a bar  192  passed through hole  41  of hub mechanism  4 . A bearing  193  is put on bar  192  of pin mechanism  19 . Bearing  193  is placed within hole  41  of hub mechanism  4 . Bar  192  of pin mechanism  19  is passed through hub mechanism  4 . A fastener  194  is sleeved on the passed bar  192  and is positioned in the hub of wheel  5 . A nut  195  is secured to the external end of fastener  194  such that wheel  5  may rotate about pin mechanism  19 . A pair of parallel adjustment members  38  are provided at the external ends of arm mechanism  3 . A threaded hole is formed at one end of parallel adjustment member  38  for threadedly securing to a threaded shank  33  of bolt  32 . Ball-shaped head  34  of bolt  32  is placed in a threaded hole  43  of one of two fork members  42  at the lower portion of hub mechanism  4 . Ball-shaped head  34  of bolt  32  is further secured by a washer  44  and nut  45 . A shock absorber  6  has a bottom end pivotably secured to an engagement member  35  of arm mechanism  3  and a top end secured to one of holes  101  of projecting member  10 . Likewise, a plurality of holes  47  are formed at each of a pair of lugs  46  on the top of hub mechanism  4 . A threaded hole  36  is provided at the internal side of arm mechanism  3 . A screw  37  is secured in threaded hole  36  wherein the bottom end of screw  37  is projected from the underside of arm mechanism  3 . Hence, the bottom end of screw  37  is first in contact with chassis  1  for holding it when arm mechanism  3  is about to contact the top of chassis  1 . Then wheel  5  is moved up together with arm mechanism  3 . In turn, the frame of model jeep is lowered to prevent arm mechanism  3  from contacting ground. This is a sate mechanism. An opening  351  of engagement member  35  is pivotably secured to the bottom end of shock absorber  6  by inserting a pin through a plurality of holes  352 . Hence, it is possible to adjust the tightness of shock absorber  6  with respect to arm mechanism  3  by selecting one of the plurality of holes  352 .  
         [0014]    Referring to FIG. 3 specifically, the angle adjustment of offset angle may be effected by adjusting the positions of two bolts  32 . In detail, suitably turn nut  45  loose. Then turn bolt  32  for adjusting the length of arm mechanism  3 . As a result, the angle adjustment of offset angle may be carried out by simply using a box end wrench. Thus, it is very convenient.  
         [0015]    Referring to FIG. 4 specifically, the angle adjustment of inclined angle may be effected by adjusting adjustment rod  2 . In detail, user may turn nut  45  or as stated above select a suitable hole  352  in securing shock absorber  6  to arm mechanism  3 . Thus a more flexible and effective adjustment of inclined angle is carried out. Further, it is possible to adjust the distance between two rear wheels by turning bolt  32  for adjusting the length of arm mechanism  3 . Furthermore, it is possible to adjust the length of model jeep by adding or removing a plurality of washers  351  between sleeves  31  and first ears  13  wherein washers  351  are put on shaft  16 .  
         [0016]    While the invention has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.