Abstract:
A stand tube assembled device; comprising: a seat rod portion; the seat rod portion having at least one sliding groove; the sliding groove being engaged with a front clamp portion and a rear clamp portion; each of the front clamp portion and rear clamp portion having at least one slot for receiving a stud at a lower side of a cushion. The seat rod portion has two inclined sliding grooves. Each of the front clamp portion and rear clamp portion has a left clamp unit and a right clamp unit which are installed at two sides of the seat rod portion. Each of the left clamp unit and right clamp unit has an inner clamp block and an outer clamp block; the inner clamp block is engaged to the outer clamp block so as to form the slot.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to stand tubes, and particularly to a stand tube assembled device, wherein the slope of a cushion is adjustable by adjusting a front clamp portion and a clamp portion at two sides of a seat rod portion. The weight of the burden applied to the cushion is distributed so as to enhance the strength of the structure. 
       BACKGROUND OF THE INVENTION 
       [0002]    In the prior art bicycle, a stand tube is installed at a middle section thereof for supporting a cushion. An assembly device is used to connect the stand tube and the cushion. In one prior at a top of the stand tube is formed with an elliptical portion and inner center of the elliptical portion is formed with a round hole. A rear side of the round tube is formed with a cambered hole. The cambered hole has a penetrating hole penetrating to the outer side of the elliptical portion. A clamp seat passes through the round hole and a rear end of the clamp seat has a protruded cambered block inserts into the cambered hole. A screw screws into the screw hole to tighten the block and the seat so as to adjust the elevation of the clamping seat. However in the prior art, only one round hole and a clamping seat is used and the locking unit for adjusting the orientation has three screws, but in fact, only one screw supports the weight of the structure and thus the strength is insufficient. Furthermore, the cushion must support the weight of a human body and thus a shock will occur in driving. For a long time period, the structure will wear and destroyed, even the user hurts. As a whole, the prior art must be improved. 
       SUMMARY OF THE INVENTION 
       [0003]    Accordingly, the primary object of the present invention is to provide a stand tube assembled device, wherein the slope of the cushion is adjustable by adjusting a front clamp portion and a clamp portion at two sides of a seat rod portion. The weight of the burden applied to the cushion is distributed so as to enhance the strength of the structure. 
         [0004]    To achieve above objects, the present invention provides a stand tube assembled device; comprising: a seat rod portion; the seat rod portion having at least one sliding groove; the sliding groove being engaged with a front clamp portion and a rear clamp portion; each of the front clamp portion and rear clamp portion having at least one slot for receiving a stud at a lower side of a cushion. By adjusting positions of the front clamp portion and the rear clamp portion, the slope of the cushion is changed. The seat rod portion has two inclined sliding grooves. Each of the front clamp portion and rear clamp portion has a left clamp unit and a right clamp unit which are installed at two sides of the seat rod portion. Each of the left clamp unit and right clamp unit has an inner clamp block and an outer clamp block; the inner clamp block is engaged to the outer clamp block so as to form the slot. The inner clamp block is installed with a guide block for guiding the outer clamp block to firmly secure to the inner clamp block. 
         [0005]    The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]      FIG. 1  is a schematic perspective view of the stand tube of the present invention. 
           [0007]      FIG. 2  is an assembled schematic view of the assembly device of a stand tube of the present invention. 
           [0008]      FIG. 3  is a lateral cross sectional view of the assembly device of a stand tube of the present invention. 
           [0009]      FIG. 4  is a schematic cross sectional view of the assembly device of a stand tube of the present invention. 
           [0010]      FIGS. 5 to 6  are schematic views showing the operation of the assembly device of a stand tube of the present invention. 
           [0011]      FIGS. 7 and 8  are schematic view showing the adjustment of the elevation of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0012]    In order that those skilled in the art can further understand the present invention, a description will be provided in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims. 
         [0013]    Referring to  FIGS. 1 to 3 , the stand tube of the present invention is illustrated. The body  1  of the present invention can be installed to a left stud  61  and a right stud  62  at a lower side of a cushion  6 . The body  1  is mainly formed by a seat rod portion  2 ; a front clamp portion at a front end of the seat rod portion  2  and a rear clamp portion at a rear end of the seat rod portion  2 . The front clamp portion and the rear clamp portion are symmetrical. 
         [0014]    A lower end of the seat rod portion  2  has a rod body  22 . An upper end of the seat rod portion  2  is a cambered head  21 . A front sliding groove  23  and a rear sliding groove  24  penetrate through the head  21 . The front sliding groove  23  and the rear sliding groove  24  are elliptical hole and are inclined. The front sliding groove  23  and rear sliding groove  24  are symmetrical to a central line of the head  21 . 
         [0015]    The front sliding groove  23  serves to receive the front clamp portion and the rear sliding groove  24  serves to receive the rear clamp portion. The front clamp portion has a left clamp unit  31  and the right clamp unit  32  at two sides of the front sliding groove  23 . The left clamp unit  31  and the right clamp unit  32  are symmetrical at two sides of the front sliding groove  23 . Each of a lower end of the left clamp unit  31  and the right clamp unit  32  has a sleeve  313 ,  323  respectively. Each of the left clamp unit  31  and right clamp unit  32  has an inner clamp block  312 ,  322  and an outer clamp block  311 ,  321 . The outer clamp block  311 ,  321  is connected to the inner clamp block,  312 ,  322 , respectively. An outer lower end of each inner clamp block  312 ,  322  is protruded with a positioning block  3121 ,  3221 , respectively. By positioning block  3121 ,  3221 , the inner clamp block  312 ,  322  cause that the outer clamp block  311 ,  321  do not rotate in connecting to the inner clamp block  312 ,  322 . The outer clamp block  311 ,  321  is connected to the inner clamp block  312 ,  322  by using screw unit  51  so as to form with a slot  314 ,  324 , respectively. The sleeve  313  of the left clamp unit  31  has a thread  3111 . The screw unit  51  serves to screw into the slots so as to lock the left clamp unit  31  and right clamp unit  32  of the front sliding groove  23 . 
         [0016]    The structure of the rear clamp portion will be described herein. Two sides of the rear sliding groove  24  have a left clamp unit  41  and a right clamp unit  42 . The front clamp portion has a left clamp unit  41  and the right clamp unit  42  at two sides of the rear sliding groove  24 . The left clamp unit  41  and the right clamp unit  42  are symmetrical at two sides of the front sliding groove  23 . Each of a lower end of the left clamp unit  41  and the right clamp unit  42  has a sleeve  413 ,  423  respectively. Each of the left clamp unit  41  and right clamp unit  42  has an inner clamp block  412 ,  422  and an outer clamp block  411 ,  421 . The outer clamp block  411 ,  421  is connected to the inner clamp block,  412 ,  422 , respectively. An outer lower end of each inner clamp block  412 ,  422  is protruded with a positioning block  4121 ,  4221 , respectively. By positioning block  4121 ,  4221 , the inner clamp block  412 ,  422  cause that the outer clamp block  411 ,  421  do not rotate in connecting to the inner clamp block  412 ,  422 . The outer clamp block  411 ,  421  is connected to the inner clamp block  412 ,  422  by using screw unit  52  so as to form with a slot  414 ,  424 , respectively. The sleeve  413  of the left clamp unit f 1  has a thread  4111 . The screw unit  52  serves to screw into the slots so as to lock the left clamp unit  41  and right clamp unit  42  of the front sliding groove  24 . 
         [0017]    In assembly, the left stud  61  passes through the slot  314  of the left clamp unit  31  and the slot  414  of the left clamp unit  41 . The right stud  62  passes through the slot  324  of the right clamp unit  32  and the slot  424  of the right clamp unit  42 . 
         [0018]    The screw unit  51  connects the left clamp unit  31  and the right clamp unit  32  to the front sliding groove  23  and connects the left clamp unit  41  and right clamp unit  42  to the rear sliding groove  24 . The inclinations of the left stud  61  and right stud  62  are determined by the positions of the front clamp portion and the rear clamp portion. The left stud  61  and right stud  62  are installed below the cushion  6 . Thus the elevations of the front clamp portion and rear clamp portion determine the slope of the cushion  6 . 
         [0019]    Referring to  FIG. 4 , a cross sectional view of the rear clamp portion is illustrated. The screw unit  52  penetrates through the right clamp unit  41 , rear sliding groove  24 , and left clamp unit  41  and is locked to the thread  4111  at lower side of the sleeve  413  to the lower end of the left clamp unit  41 . Thus a firm structure is formed. 
         [0020]    Therefore, it is known that by adjusting the positions of the front sliding groove  23  and rear sliding groove  24 , the respect positions of the slots  314 ,  324 ,  414 ,  424  and the left stud  61  and right stud  62  are adjusted. 
         [0021]    Referring to  FIGS. 5 and 6 , a schematic view about the operation of the present invention is illustrated. See  FIG. 5 , the front clamp portion is lower than the rear clamp portion, the left stud  61  and right stud  62  are inclined toward the front sliding groove  23 . On the contrary, if it is desired to adjust the positions of the left stud  61  and right stud  62  to inclined toward the right stud  62 , see  FIG. 6 , the front clamp portion is lifted and the respect positions of the slots  314 ,  324 ,  414 ,  424  and the left stud  61  and right stud  62  are adjusted so as to adjust the inclination of the cushion  6 . 
         [0022]    Referring to  FIGS. 7 and 8 , the operation of the present invention is illustrated. Before adjusting, the front clamp portion and rear clamp portion are adjusted so that the two separates from one another. Moreover, the distance between the front clamp portion and the rear clamp portion respective the left stud  61  and right stud  62  is increased, and thus the cushion  6  is lowered toward the rod body  22 . Thereby if the distance is decreased, thus the distance between the left stud  61  and right stud  62  will decrease so that the cushion  6  is lifted and moves toward the head  21 . 
         [0023]    In summary, the front sliding groove  23  and rear sliding groove  24  are symmetrical along the head  21 . The front clamp portion and rear clamp portion displace along the front sliding groove  23  and rear sliding groove  24 . The front clamp portion and rear clamp portion will displace according to the inclination of the front sliding groove  23  and rear sliding groove  24 . Thus the positions of the front clamp portion and rear clamp portion are changeable so that the slope of the cushion  6  is changed. 
         [0024]    Furthermore, in the present invention, the front sliding groove  23  and rear sliding groove  24  can be combined as a single groove, or the rear clamp portion and front clamp portion are combined with the same slot and the front clamp portion and rear clamp portion can be secured to the slot and the left stud  61  and right stud  62  passes through the same slot; or the front sliding groove  23  and rear sliding groove  24  are symmetrical to a center of the seat rod portion  2 . All these are within the scope of the present invention. 
         [0025]    The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.