Patent Publication Number: US-2005126840-A1

Title: Bicycle with a slant backrest frame

Description:
BACKGROUND OF THE INVENTION  
      The present invention is related to a bicycle with a slant backrest frame, including a bicycle embodiment, and a power unit wherein the bicycle embodiment is equipped with a saddle having a slant backrest, and a central tube disposed under the saddle thereof in communication with a lower tube to which a switch device is fixedly attached at a preset position. The power unit made up of a rear loading bracket and a storage battery is joined to the central tube with the rear loading bracket securely fixed to a slant flat opening of the central tube and the storage battery adapted at a receiving cavity therein; whereby, the bicycle embodiment can be either pedaled by feet or electrically moved via the power unit conductively linked to the switch device thereof. Besides, first/second electrical and conducting wires of the switch device and the storage battery thereof respectively are concealed at the central and the lower tubes therein for protection thereof as well as the overall beauty of the bicycle embodiment. Moreover, the storage battery can be easily withdrawn from the receiving cavity thereof for recharging, enable a rider to make use of the bicycle embodiment without waiting for the completion of the charging operation thereof.  
      A conventional bicycle with a slant backrest frame can only be moved by pedaling with both feet without any electrically powered mechanism adapted thereto. Due to the design of pedaling, a rider can&#39;t sit back comfortably on the saddle with the back leaned properly against the backrest of the bicycle, greatly reducing the function of the backrest thereof.  
     SUMMARY OF THE PRESENT INVENTION  
      It is, therefore, the primary purpose of the present invention to provide a bicycle with a slant backrest frame, including a bicycle embodiment and a power unit wherein, via the power unit conductively linked to a switch device, the bicycle embodiment can be either pedaled by both feet or electrically powered via the power unit so that a rider can freely choose to turn on the power unit via the switch device and sit back comfortably on a saddle of the bicycle embodiment with the back leaned properly against a slant backrest of the saddle thereof, facilitating the use of the slant backrest thereof.  
      It is, therefore, the second purpose of the present invention to provide a bicycle with a slant backrest frame wherein the power unit is made up of a rear loading bracket and a storage battery, and the bicycle embodiment is equipped with a central tube having a receiving cavity disposed at the inner side thereof in communication with a lower tube; whereby, first/second electrical wires of the switch device and first/second conducting wires of the storage battery thereof are concealed at the central and lower tubes therein for the purpose of protection thereof as well as achieving the overall beauty of the bicycle embodiment thereof.  
      It is, therefore, the third purpose of the present invention to provide a bicycle with a slant backrest frame wherein, via the separate design of the power unit and the bicycle embodiment thereof, the storage battery of the power unit can be individually withdrawn from the receiving cavity of the central tube for recharging, enable a rider to make use of the bicycle embodiment without waiting for the completion of the charging operation thereof.  
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a perspective exploded view of the present invention.  
       FIG. 2  is a perspective view of the present invention in assembly.  
       FIG. 3  is a cross sectional view of the present invention in assembly. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
      Please refer to  FIG. 1 . The present invention is related to a bicycle with a slant backrest frame, comprising a bicycle embodiment  10 , and a power unit  20 . The bicycle embodiment  10  is equipped with a saddle  11  having a slant backrest  111 , and a rectangular central tube  12  disposed under the saddle  11  thereof. The central tube  12  thereof has a receiving cavity  121  disposed at the inner side thereof, a slant flat opening  122  levelly cut at the rear side thereof, an annular groove  123  indented at the upper periphery of the slant flat opening  122  thereof for a spring element  1231  to be adapted therein, and a screw hole  124  disposed at the bottom of the annular groove  123  thereof communicating with the receiving cavity  121  thereby. A through hole  125  is disposed at the front side of the central tube  12  to be communicated with a lower tube  13  of the bicycle embodiment  10  thereof. At a preset position of the lower tube thereof is fixedly mounted a switch device  14  having a first electrical wire  141  disposed at one side thereof to be connected with a driving mechanism (without shown in the diagram) of a rear wheel  15 , and a second electrical wire  142  disposed at the other side thereof to be led through the through hole  125  of the central tube  12  and extended through the receiving cavity  121  thereof to come out at the slant flat opening  122  thereof with a socket  1421  attached at the end thereto. The power unit  20  is made up of a rear loading bracket  21  and a storage battery  22 . The rear loading bracket  21  has a coupling hole  211  disposed at one side thereof correspondingly matched to a screw  212 , a pair of elastic clamping plates  213  symmetrically protruding at the other side thereof each having a support edge  2131  cut at the bottom side thereon, and an arc stop block  214  protruding at a preset place thereon to form a retaining groove  215  therein. A wire passage hole  216  is disposed at the middle of the arc stop block  214  thereon, and a step-wise sleeve rod  2121  is extending at the middle section of the screw  212  thereof. The storage battery  22  is provided with a first and a second conducting wires  221 ,  222  attached at both sides thereof respectively wherein the first conducting wire  221  has a plug  2211  fixed at the end thereto, and the second conducting wire  222  is led from one side of the retaining groove  215  thereof to come out at the wire passage hole  216  there-through. A charging plug  2221  is attached to the end of the second conducting wire  222  extending out at the wire passage hole  216  thereof to abut against the outer side of the stop block  214  for location thereby. A belt body  223  is securely fixed to the middle section of the battery  22  with a handle section  2231  wound at both ends of the storage battery  22  respectively.  
      Please refer to FIGS.  2  to  3  inclusive. In assembly, the plug  2211  of the storage battery  22  thereof is conductively inserted to the socket  1421  of the second electrical wire  142  before the storage battery  22  is pushed through the slant flat opening  122  of the central tube  12  and adapted at the receiving cavity  121  therein. The elastic clamping plates  213  of the rear loading bracket  21  are applied to the central tube  12  thereof and flexibly joined to the slant flat opening  122  thereof in sleeve engagement with the support edges  2131  levelly abutted against the bottom side of the receiving cavity  121  thereon. The coupling hole  211  of the rear loading bracket  21  is mutually matched to the annular groove  123  of the central tube  12 , and the screw  212  is led through the annular groove  123  via the coupling hole  211  thereof with the sleeve rod  2121  thereof compressing the spring element  1231  adapted at the annular groove  123  therein. The screw  212  led through the coupling hole  211  and the annular groove  123  thereof in a sequence is screwed up to the screw hole  124  thereof, securely fixing the rear loading bracket  21  at the slant flat opening  122  thereon to complete the assembly of the present invention.  
      Thus, via the power unit  20  conductively linked to the switch device  14  thereof, a rider can freely choose either to simply pedaled the bicycle by feet or to electrically move the bicycle embodiment  10  thereof via the power unit  20  in practical use. When the power unit  40  is turned on via the switch device  14 , the rider can comfortably sit back on the saddle  11  with the back leaned properly against the slant backrest  111  thereof, facilitating the use of the slant backrest ill thereof. Besides, the receiving cavity  121  of the central tube  12  is communicated with the lower tube  13  thereof to securely conceal the first/second electrical wires  141 ,  142 , of the switch device  14  and the first/second conducting wires  221 ,  222  of the storage battery  22  therein, protectively sheltering the storage battery  22  and the wires thereof as well as boosting the beauty of the bicycle embodiment  10  thereof as a whole.  
      In case the power of the storage battery  22  is used up, the screw  212  is released from the screw hole  124  of the central tube  12  thereof before the rear loading bracket  21  is pulled outwards to detach the elastic clamping plates  213  from the receiving cavity  121  thereof. The storage battery  22  can then be withdrawn from the receiving cavity  121  via the handle section  2231  of the belt body  223  and power is connected to the charging plug  2221  of the storage battery for recharging thereof. Thus, via separate design of the power unit  20  and the bicycle embodiment  10  thereof, the rider can make use of the bicycle embodiment  10  without waiting for the completion of the charging operation thereof.