Abstract:
The present invention discloses a portable folding tattoo chair comprising a left part ( 100 ) and a right part ( 200 ), the left part ( 100 ) of the chair comprising a left cushion ( 101 ), a left fixing plate ( 102 ), a left fixing frame ( 103 ) and a left footing support ( 104 ); the right part ( 200 ) of the chair comprising a right cushion ( 201 ), a right fixing plate ( 202 ), a right fixing frame ( 203 ) and a right footing support ( 204 ); the left part ( 100 ) and the right part ( 200 ) of the chair being rotatable so as to be folded together, the left footing support ( 104 ) and the right footing support ( 204 ) being rotatable to be folded up. The tattoo chair in unfolding states may provide various auxiliary modes for different tattoo positions. The chair can also be folded after use to save space and transportation cost. The chair can be used as a pushcart to add functionality.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention generally relates to a tattoo chair, and more particularly, the invention relates to a portable folding tattoo chair. 
       BACKGROUND 
       [0002]    Tattoo means to make pattern or message on skin by pricking the skin with a needle with colored dyes; to make permanent patterns by pricking the skin with a needle and then applying dyes on the wound; or to make ridgy scar on the skin. 
         [0003]    Tattoo represents character and belief of a person, which comes from the custom of decorating skin in some primitive races in the world; i.e. to make non-fading pattern on some part of the body by operation. Tattoo patterns include bird, beast, flower, lection and trigram etc, reflecting the consciousness for beauty and religion ideas. In China, ethnic groups such as Gaoshan, Deang, Li, Dulong, Dai, Bulang and Jinuo have tattoo customs. 
         [0004]    Usually, since making a tattoo needs a long time, the person being tattooed is required to hold a pose for a long time, which is difficult for the tattooed person without any auxiliary tool. Tattoo chair is often used as the auxiliary tool to a tattoo apparatus, which may help the tattooed person hold the pose easily. 
         [0005]    There are some drawbacks in the existing tattoo chairs: 1) the chair is a tool for helping the tattooed person to hold pose in one position, which is unable to provide help when the tattooed person is in other tattoo positions; 2) the chair is of large size and occupies a large space, which requires more room for a tattoo shop; 3) the chair requires a large space in transportation, which increases the transportation cost; 4) it is inconvenient to move when being in use. 
       CONTENTS OF THE INVENTION 
       [0006]    The present invention is designed to provide a portable folding tattoo chair. The unfolded tattoo chair may provide a plurality of positions for the tattooed person to hold poses. The tattoo chair may be folded after use to save space, facilitate transportation and lower transportation cost. The folded tattoo chair may also be used as a pushcart, which adds additional functionality. 
         [0007]    To achieve the above technical effects, the present invention provides a tattoo chair comprising a left part and a right part. The left part of the chair comprises a left cushion, a left fixing plate, a left fixing frame and a left footing support. The right part of the chair comprises a right cushion, a right fixing plate, a right fixing frame and a right footing support. The left part and the right part of the chair are rotatably attached via connecting units so as to be folded together. Both of the left footing support and the right footing support are rotatable to be folded up. 
         [0008]    Preferably, where the left fixing frame joints the right fixing frame, lugs are mounted on each side of the left fixing frame and the right fixing frame, and a pivot is provided for pivotably attaching the lug on each side of the left fixing frame and the lug on each sides of the right fixing frame. The arrangement of the lugs makes the left part and the right part of the chair be rotatable about the lug pivot, the rotation angle may be up to about 180 degrees, to fold the two parts of the chair up against each other. When the chair is in unfolding position, as the left fixing frame and the right fixing frame stand against each other, and also due to the function of the lugs and the pivot, the tattoo chair will be in a flat state and may not be rotated unlimitedly. 
         [0009]    Preferably, the upper end of the left footing support is rotatably fixed to the left fixing frame and can only be rotated inwards to fold up. The upper end of the right footing support is rotatably fixed to the right fixing frame and can only be rotated inwards to fold up. Rotating the left footing support and right footing support inwards to fold the left and the right footing supports up and then folding the left part and right part of the chair about the pivots in lugs will reduce the floor space occupied by the tattoo chair by about 50%. 
         [0010]    Preferably, the left footing support comprises a left horizontal bearer and a left vertical bearer. The upper end of the left vertical bearers is rotatably fixed to the left fixing frame. A left supporting strut is provided on the left vertical bearers. One end of the left supporting strut is rotatably fixed to the left vertical bearer. A left connecting strut is provided on the left fixing frame. One end of the left connecting strut is rotatably fixed to the left fixing frame. The middle part of the left connecting strut is pivotably attached to one end of the left supporting struts. With the left support strut on the left vertical bearer and the left connecting strut on the left fixing frame, the left footing support can be controlled to rotate within a fixed range and can be provided with stability. 
         [0011]    Preferably, a small hole is provided on the end of the left connecting strut, and another small hole is provided symmetrically to the small hole about a rotatable pivot. An arc-like bulge matching the two small holes in size is provided on the middle part of the left supporting strut. The distance from the bulge to the rotatable pivot is equal to the distance from the rotatable pivot to the small holes. When the left vertical bearer stands vertically, the arc-like bulge will be caught in the small hole on the end of the left connecting strut, supporting the left footing support to provide stability. When the left vertical bearer  108  is rotated and the arc-like bulge separates from the small hole, the left vertical bearer, the left supporting strut and the left connecting strut rotate together. When the left vertical bearer is folded to a horizontal position, the arc-like bulge will be caught in another small hole to keep the stability in folding position. 
         [0012]    Preferably, the left vertical bearer is adjustable in height. The height of the left vertical bearer can be adjusted according to the height of the tattooed person. 
         [0013]    Preferably, the left vertical bearer is a hollow cylinder, into which an inner rod fixed to the horizontal bearer is inserted. A plurality of recesses is disposed on the inner rod. At the lower part of a pair of the left vertical bearer, a hollow adjusting bearer is provided. A left locking pin and a right locking pin are provided in the cavity of the hollow adjusting bearer. A spring is provided between the two pins. A left pin hole and a right pin hole, both in an oblong shape, are disposed on the sidewall of the adjusting bearer. One end part of the left locking pin is nearly right-angle bended and extends out from the left pin hole. One end part of the right locking pin is nearly right-angle bended and extends out from the right pin hole. When adjusting the height of the pair of the left vertical bearer, press hard on the end parts of the left locking pin and the right locking pin to compress the spring between the pins. The left and right locking pins escape from the recesses on the inner rods separately. Having adjusted the left vertical bearer to a suitable height, the end parts of the left and right locking pins are released. Under the force from the spring, the left and right locking pins will insert into the recesses on the inner rods to fix the height of the left vertical bearer. 
         [0014]    Preferably, a ring clamp is provided on the lower part of the left vertical bearer to provide stability to the bearer. 
         [0015]    Preferably, the right edge of the left fixing plate is rotatably fixed to the left fixing frame. Between the left fixing plate and the left fixing frame, a supporting device is provided for supporting the left fixing plate and adjusting the rotation height of the plate. The supporting device comprises a movable part and a fixed part. One end of the fixed part is rotatably fixed to the left fixing frame. The fixed part has a hollow cavity provided with odontoid steps. One end of the movable part is rotatably fixed to the left fixing plate, and the other end is inserted into the hollow cavity of the fixed part. The inserting end of the movable part has a structure matching the odontoid steps in the fixed part. The inserting end of the movable part is limited by the cavity of the fixed part and can move only within the cavity. Raising the left edge of the left fixing plate will make the plate rotate about its right edge, the movable part move up along the odontoid steps in the cavity of the fixed part at the same time to adjust the position of the movable part relative to the steps in the cavity according to the desired height. 
         [0016]    Preferably, at least two lateral tapes of hooks are provided on upper surface of the left fixing plate, and at least two corresponding lateral tapes of loops are provided on the bottom surface of the left cushion. 
         [0017]    Preferably, the right footing support comprises a right horizontal bearer and a right vertical bearer. The upper end of the right vertical bearers is rotatably fixed to the right fixing frame. A right supporting strut is provided on the right vertical bearers. One end of the right supporting strut is rotatably fixed to the right vertical bearer. A right connecting strut is provided on the right fixing frame. One end of the right connecting strut is rotatably fixed to the right fixing frame. The middle part of the right connecting strut is pivotably attached to one end of the right supporting struts. With the left support strut on the right vertical bearer and the right connecting strut on the right fixing frame, the right footing support can be controlled to rotate within a fixed range and can be provided with stability. 
         [0018]    Preferably, a small hole is provided on the end of the right connecting strut, and another small hole is provided symmetrically to the small hole about a rotatable pivot. An arc-like bulge matching the two small holes in size is provided on the middle part of the right supporting strut. The distance from the bulge to the rotatable pivot is equal to the distance from the rotatable pivot to the small holes. When the right vertical bearer stands vertically, the arc-like bulge will be caught in the small hole on the end of the right connecting strut, supporting the right footing support to provide stability. When the right vertical bearer  108  is rotated and the arc-like bulge escapes from the small hole, the right vertical bearer, the right supporting strut and the right connecting strut rotate together. When the right vertical bearer is folded to a horizontal position, the arc-like bulge will be caught in another small hole to keep the stability in folding position. 
         [0019]    Preferably, the right vertical bearer is adjustable in height. The height of the right vertical bearer can be adjusted according to the height of the tattooed person. 
         [0020]    Preferably, the right vertical bearer is a hollow cylinder, into which an inner rod fixed to the horizontal bearer is inserted. A plurality of recesses is disposed on the inner rod. At the lower part of a pair of the right vertical bearer, a hollow adjusting bearer is provided. A left locking pin and a right locking pin are provided in the cavity of the hollow adjusting bearer. A spring is provided between the two pins. A left pin hole and a right pin hole, both in an oblong shape, are disposed on the sidewall of the adjusting bearer. One end part of the left locking pin is approximately right-angle bended and extends out from the left pin hole. One end part of the right locking pin is approximately right-angle bended and extends out from the right pin hole. When adjusting the height of the pair of the right vertical bearer, press hard on the end parts of the left locking pin and the right locking pin to compress the spring between the pins. The left and right locking pins escape from the recesses on the inner rods, respectively. Having adjusted the right vertical bearer to a suitable height, the end parts of the left and right locking pins are released. Under the force from the spring, the left and right locking pins will insert into the recesses on the inner rods to fix the height of the right vertical bearer. 
         [0021]    Preferably, a ring clamp is provided on the lower part of the right vertical bearer to provide stability to the bearer. 
         [0022]    Preferably, at least two lateral tapes of hooks are provided on upper surface of the right fixing plate, and at least two corresponding lateral tapes of loops are provided on the bottom surface of the right cushion. 
         [0023]    Preferably, the right fixing frame comprises four lateral beams and two longitudinal beams fixed to the ends of the four lateral beams. The outer two of the four lateral beams are in hollow and tubular configuration. A “]”-shaped extension member is provided outside the right part of the chair. The rods of the extension member are inserted into the cavities of the two horizontal beams, respectively. 
         [0024]    Preferably, a hollow protrusion is provided over each of the right ends of the two hollow horizontal beams. The cavity of the hollow protrusion is in communication with the cavity of the horizontal beam. The hollow protrusion matches the rod of “]”-shaped member. A fastening screw hole is provided on hollow protrusion. The rod of the “]”-shaped member may be inserted into the hollow protrusion for use according to the poses required for the tattooed person. 
         [0025]    Preferably, handles are secured to the edge of left and right fixing frames, from the front view, respectively. The distance between the left handle and right handle and the inner size of the handles matches the rod of the “]”-shaped extension member. A fastening screw hole is provided on each handle on the left and right fixing frame. A bolt is used to secure the rod of the “]”-shaped extension member, and thus control the height and stability of the extension member. 
         [0026]    Preferably, four roller wheels  138  are mounted under the left fixing frame, and two roller wheels are mounted under the right fixing frame. When both the left and right footing supports are folded up, the whole tattoo chair can be moved freely on the six wheels to form a pushcart. The rod of the “]”-shaped extension member can be vertically inserted into the hollow protrusion provided over the right end of the right fixing frame, to be used as a handrail of the pushcart. 
         [0027]    Preferably, the “]”-shaped extension member comprises an outer rod, an inner rod, a lateral rod and a soft cushion surrounding the lateral rod. The outer rod is a hollow configuration and at least two location holes are provided on the surface. The inner rod is inserted into the outer rod, and location bulges matching with the location holes are provided on the surface of inner rod. 
         [0028]    Preferably, at least two elastic straps are hanged on the rod of the “]”-shaped extension member. 
         [0029]    The tattoo chair in unfolding states may provide various auxiliary modes for different tattoo positions. The chair can also be folded after use to save space and transportation cost. The chair can be used as a pushcart to add functionality. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0030]    Below is the more particular description of the specific embodiments of the present invention as illustrated in the accompanying drawings: 
           [0031]      FIG. 1  illustrates the chair of the present invention in unfolding position; 
           [0032]      FIG. 2  is a plan view of  FIG. 1 ; 
           [0033]      FIG. 3  illustrates the chair of  FIG. 2  without the left and right cushions; 
           [0034]      FIG. 4  illustrates the chair of the present invention in unfolding position while the left fixing frame being rotated, supported and fixed; 
           [0035]      FIG. 5  illustrates the chair of the present invention while the left fixing frame being rotated, supported and fixed, and the left and right footing supports being in folding position; 
           [0036]      FIG. 6  illustrates the chair of the present invention while the left fixing frame being rotated and supported and fixed, the left and right supports being in folding position; and the left and right parts of the chair being in folding position; 
           [0037]      FIG. 7  illustrates the chair of the present invention with the extension member in extension state of; 
           [0038]      FIG. 8  illustrates the chair of the present invention with the extension member inserted and fixed in the hollow protrusion over the right end of right fixing frame; 
           [0039]      FIG. 9  illustrates the chair of the present invention with the extension member inserted and fixed in the handles on the left and right fixing frames; 
           [0040]      FIG. 10  is the bottom view of the chair with the left and right footing supports in completely folded position and the extension member in extension state; 
           [0041]      FIG. 11  illustrates the extension of the left and right footing supports of the present invention; 
           [0042]      FIG. 12  is the schematic of a specific embodiment of the chair in use; 
           [0043]      FIG. 13  is the schematic of another specific embodiment of the chair in use; 
           [0044]      FIG. 14  is the schematic of one more embodiment of the chair in use. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0045]    Referring to  FIG. 1 , the tattoo chair of present invention comprises a left part  100  and a right part  200 . The left part  100  of the chair comprises a left cushion  101 , a left fixing plate  102 , a left fixing frame  103  and a left footing support  104 . The right part  200  of the chair comprises a right cushion  201 , a right fixing plate  202 , a right fixing frame  203  and a right footing support  204 . The left part  100  and the right part  200  are rotatably attached via two connecting units so as to be folded together. Both of the left footing support  104  and the right footing support  204  can be rotated to fold to the frame. 
         [0046]    Referring to  FIGS. 1 ,  4 ,  5 ,  6 ,  8  and  9 , in a preferred embodiment, the left part  100  and the right part  200  of the chair may be rotated to fold up in a following way: where the left fixing frame joints the right fixing frame, one lug  105  is mounted on each side of the left fixing frame  103 , one lug  205  is mounted on each side of the right fixing frame  203 , and a pivot  300  is used for pivotably attaching the lug  105  on each side of the left fixing frame  103  and the lug  205  on each sides of the right fixing frame  203 . A connecting unit is thus formed by the lugs  105 ,  205  and the pivot  300 . With the connecting units, the left part  100  and the right part  200  may be rotated about the pivots  300 , the rotation angle being up to about 180 degrees, to fold the two parts of the chair up against each other. When the chair is unfolded, as the left fixing frame  103  and the right fixing frame  203  will stand against each other, and also due to the function of the lugs  105 ,  205  and the pivots  300 , the tattoo chair will be in an unfolding and flat position and may not be rotated unlimitedly. 
         [0047]    Referring to  FIGS. 1 ,  4 ,  5 ,  6  and  10 , in a preferred embodiment, the left footing support  104  and the right footing support  204  may be pivotably folded in the following way. The upper end of the left footing support  104  is rotatably fixed to the left fixing frame  103  via a pivot  106 . The left footing support  104  can only be rotated inwards and folded. The upper end of the right footing support  204  is rotatably fixed to the right fixing frame  203  via a pivot  206 , and the right footing support  204  can only be rotated inwards and folded. Folding the left footing support  104  and right footing support  204  and then folding the left part  100  and right part  200  of the chair about the pivots  300  in lugs  105   205  will reduce the floor space occupied by the tattoo chair by 50%. 
         [0048]    Referring to  FIGS. 5 and 6 , in a preferred embodiment, the left footing support  104  comprises a left horizontal bearer  107  and a pair of left vertical bearer  108 . The upper end of each left vertical bearers  108  is rotatably fixed to the left fixing frame  103  via a pivot  106 . A pair of left supporting struts  109  is provided on the pair of the left vertical bearers  108 , respectively. One end of each of the left supporting struts  109  is rotatably fixed to the left vertical bearer  108 . A left connecting strut  110  is provided on the left fixing frame  103 . The left connecting strut  110  is in a U-shape configuration and two ends of the U-shape configuration are rotatably fixed to the left fixing frame  103  via a pivot  111 , respectively. The left connecting strut  110  is pivotably attached to both of the other ends of the pair of the left supporting struts  109  via pivots  112 . The left footing support  104  can be rotated within a range of about 90-degree from a position of leaning on to a position of being perpendicular to the left fixing frame  103  and can provide stability by the pair of left supporting struts  109  on the left vertical bearer  108  and the left connecting strut  110  on left fixing frame  103 . 
         [0049]    Referring to  FIGS. 5 ,  6  and  10 , in a further improved embodiment, a small hole  113  is provided on one side of the left connecting strut  110 , and another small hole  114  is provided symmetrically to the small hole  113  about the rotatable pivot  112 . One bulge  115  in arc shape matching the two small holes in size is provided on the middle part of each left supporting strut  109 . The distance from the bulge  115  to the rotatable pivot  112  is equal to the distance from the rotatable pivot  112  to the small hole  113 ,  114 . When the left vertical bearer  108  stands vertically, the arc-like bulge  115  will be caught in the small hole  113  on the left connecting strut  110 , supporting the left footing support  104  to provide stability. When the left vertical bearer  108  is rotated and the bulge  115  separates from the small hole  113 , the left vertical bearer  108 , the pair of the left supporting struts  109  and the left connecting strut  110  will rotate together. When the left vertical bearer  108  is folded to a horizontal position, the bulge  115  will be caught in another small hole  114  to keep the stability in folding position. 
         [0050]    Referring to  FIG. 11 , in a further improved embodiment, the height of the pair of left vertical bearer  108  can be adjusted simultaneously. The left vertical bearer  108  is a hollow cylinder, into which an inner rod  116  fixed to the horizontal bearer  107  is inserted. A plurality of recesses  117  is disposed on the inner rod  116 . At the lower parts of the pair of the left vertical bearer  108 , a hollow adjusting bearer  118  is fixed between the vertical bearers  108 . A left locking pin  119  and a right locking pin  120  are provided in the cavity of the hollow adjusting bearer  118 . A spring  121  is provided between the two pins  119 ,  120 . A left pin hole  122  and a right pin hole  123 , both in an oblong shape, are disposed on the sidewall of the adjusting bearer  118 . One end part of the left locking pin  119  is nearly right-angled bended and extends out from the left pin hole  122 . One end part of the right locking pin  120  is nearly right-angled bended and extends out from the right pin hole  123 . When adjusting the height of the pair of the left vertical bearer  108 , press hard on the end parts of the left locking pin  119  and the right locking pin  120  to compress the spring  121  between the pins  119 ,  120 . The left and right locking pins  119 ,  120  will separate from the recess  117  on the inner rod  116 . Having adjusted the left vertical bearer  108  to a suitable height, the end parts of the left and right locking pins  119 ,  120  are released. Under the force from the spring, the left and right locking pins  119 ,  120  will insert into the recesses  117  on the inner rods  116  to fix the height of the left vertical bearer  108 . The height of the left vertical bearer  108  thus is adjusted according to the height of person tattooed. Referring to  FIGS. 1 ,  4 ,  5 ,  6 ,  8 ,  9  and  11 , in a preferred embodiment, a ring clamp  124  is provided on the lower part of the left vertical bearer  108  to provide stability. 
         [0051]    Further referring to  FIGS. 4 ,  5  and  6 , in a further improved embodiment, the right part of the left fixing plate  102  is rotatably fixed to the left fixing frame  103  via a hinge  125 . Between the left fixing plate  102  and the left fixing frame  103 , a supporting device  126  is provided for supporting the left fixing plate  102  and adjusting the height of the plate. The supporting device  126  comprises a movable part  127  and a fixed part  128 . One end of the fixed part  128  is rotatably fixed to the left fixing frame  103 . The fixed part  128  has a hollow cavity provided with odontoid steps  129 . One end of the movable part  127  is rotatably fixed to the left fixing plate  102 , and the other end is inserted into the hollow cavity of the fixed part  128 . The inserting end of the movable part  127  has a structure matching the odontoid steps  129  in the fixed part  128 . The inserting end of the movable part is limited by the cavity of the fixed part  128  and can move only in the cavity. Raising the left edge of the left fixing plate  102  makes the plate rotate about its right edge, the movable part  127  will move up along the odontoid steps  129  in the cavity of the fixed part  128  at the same time, so as to adjust the position of the movable part  127  relative to the steps in the cavity to satisfy the desired height.  FIG. 13  shows the profile of a specific embodiment in which the left fixing plate  102  rotating and supporting the tattooed person. 
         [0052]    Referring to  FIG. 3 , in a further improved embodiment, at least two lateral nylon fastening tapes  130 , such as hooks, are provided on upper surface of the left fixing plate  102  and the tapes corresponding to the tapes  130 , such as loops (not shown!), are provided on the bottom surface of the left cushion  101 . Through the design of fastening tapes  130 , the left cushion  101  can be easily removed from and installed on the left fixing frame  103 . 
         [0053]    Referring to  FIGS. 1 ,  4 ,  5 ,  6 ,  8 ,  9  and  10 , in a preferred embodiment, the right footing support  204  comprises a right horizontal bearer  207  and a pair of right vertical bearer  208 . The upper end of each right vertical bearer  108  is rotatably fixed to the right fixing frame  203  via a pivot  206 . A pair of right supporting struts  209  is provided on the pair of the right vertical bearers  208 , respectively. One end of each of the right supporting bearers  209  is rotatably fixed to the right vertical bearer  208 . A right connecting strut  210  is provided on the right fixing frame  203 . The right connecting strut  210  is in a U-shape configuration and two ends of the U-shape configuration are rotatably fixed to the right fixing frame  203  via a pivot  211 , respectively. The right connecting strut  210  is pivotably attached to both of the other ends of the pair of the right supporting struts  209  via pivots  212 . The right footing support  204  can be rotated within a range of about 90-degree from a position of leaning on to a position of being perpendicular to the right fixing frame  203  and can provide stability by the pair of right supporting struts  209  on the right vertical bearer  208  and the right connecting strut  210  on right fixing frame  203 . 
         [0054]    Referring to  FIGS. 5 ,  6  and  10 , in a further improved embodiment, a small hole  213  is provided on one side of the right connecting strut  210 , and another small hole  214  is provided symmetrically to the small hole  213  about the rotatable pivot  212 . One bulge  215  in arc shape matching the two small holes in size is provided on the middle part of each right supporting strut  209 . The distance from the bulge  215  to the rotatable pivot  212  is equal to the distance from the rotatable pivot  212  to the small hole  213 ,  214 . When the right vertical bearer  208  stands vertically, the bulge  215  will be caught in the small hole  213  on the right connecting bearer  210 , supporting the right footing support  204  to provide stability. When the right vertical bearer  208  is rotated and the bulge  115  separates from the small hole, the right vertical bearer  108 , the pair of the right supporting struts  109  and the right connecting strut  110  will rotate together. When the right vertical bearer  208  is folded to a horizontal position, the bulge  215  will be caught in another small hole  214  to keep the stability in folding position. 
         [0055]    Referring to  FIG. 11 , in a further improved embodiment, the pair of right vertical bearer  208  has a structure for adjusting the height simultaneously. For the tattooed people in different height, the height of the right vertical bearer  208  thus can be adjusted to comply with corresponding requirement. 
         [0056]    Referring to  FIG. 11 , in a further improved embodiment, the left footing support  104  and the right footing support  204  are of the same structure. That is, the right vertical bearer  208  is a hollow cylinder, into which an inner rod fixed to the horizontal bearer is inserted. A plurality of recesses is provided on the inner rod. At the lower parts of the pair of the left vertical bearer, a hollow adjusting bearer is provided. A left locking pin and a right locking pin are provided in the cavity of the hollow adjusting bearer. A spring is provided between the two pins. A left pin hole and a right pin hole, both in an oblong shape, are disposed on the sidewall of the adjusting bearer. One end part of the left locking pin is nearly right-angled bended and extends out from the left pin hole. One end part of the right locking pin is nearly right-angled bended and extends out from the right pin hole. When adjusting the height of the pair of the right vertical bearer, press hard on the end parts of the left locking pin and the right locking pin to compress the spring between the pins. The left and right locking pins will separate from the recesses on the left and right inner rods. Having adjusted the right vertical bearer to a suitable height, the end parts of the left and right locking pins are released. Under the force from the spring, the left and right locking pins will insert into the recesses on the inner rods to fix the height of the right vertical bearer. 
         [0057]    Referring to  FIGS. 1 ,  4 ,  5 ,  6 ,  8 ,  9  and  11 , in a preferred embodiment, a ring clamp  224  is provided on the lower part of the right vertical bearer  208  to provide stability. 
         [0058]    Referring to  FIG. 3 , in a further improved embodiment, at least two lateral nylon fastening tapes  230 , such as hooks, are provided on the right fixing plate  202  and the tapes corresponding to the tapes  230 , such as loops (not shown!), are provided on the bottom surface of the right cushion  201 . Through the design of fastening tapes  230 , the right cushion  201  can be easily removed from and installed on the right fixing frame  103 . 
         [0059]    Referring to  FIG. 10 , in a further improved embodiment, the left fixing frame  103  comprises four lateral beams  131  and two longitudinal beams  132  fixed to the ends of the four lateral beams  131 . The right fixing frame  203  comprises four lateral beams  231  and two longitudinal beams  232  fixed to the ends of the four lateral beams  231 . The outer two of the four lateral beams  231  on the right fixing frame  203  are in hollow and tubular configuration. A “]”-shaped extension member  233  is provided outside the right part  200  of the chair. The rod  234  of the extension member  233  is inserted into the cavities of the two horizontal beams  231 , respectively. Referring to  FIG. 12 , the arrangement of the extension member  233  may be used to extend the length of the chair when the person being tattooed lies in the chair.  FIG. 12  shows an embodiment of the present invention. 
         [0060]    Referring to  FIG. 8 , in a further improved embodiment, a hollow protrusion  235  is provided over each of the right ends of the two hollow horizontal beams  231 . The cavity of the hollow protrusion  235  is in communication with the cavity of the horizontal beam  231 . The hollow protrusion  235  matches the rod  234  of “]”-shaped extension member  233 . A fastening screw hole  246  is provided on the sidewall of the horizontal beam  231  communicating with the hollow protrusion  235 . After the rod  234  of the “]”-shaped extension member  233  is inserted into the hollow protrusion  235 , a bolt is used to fix it. The rod  234  of the “]”-shaped extension member  233  may be used to insert into the protrusion  235  according to the poses required for the tattooed person. 
         [0061]    Referring to  FIGS. 1 ,  3 ,  4 ,  7  and  9 , in a further improved embodiment, handles  136  and  236  are secured to the edge of left and right fixing frames  103 ,  203  from the front view, respectively. The distance between the left handle  136  and right handle  236  and the inner size of the handle matches the rod  234  of the “]”-shaped member. A fastening screw hole  137 ,  237  is provided on each handle on the left and right fixing frame  103  and  203 . The angle between the center line of screw hole  137 ,  237  and the horizontal center line of the chair is about 45 degrees. A bolt is used to secure the rod  234  of the “]”-shaped extension member  233 , and thus control the height and stability of the member.  FIG. 14  shows an embodiment of the present invention. 
         [0062]    Referring to  FIGS. 1 ,  4 ,  5 ,  6 ,  8 ,  9  and  10 , in a further improved embodiment, four roller wheels  138  are mounted under the left fixing frame  103 , and two roller wheels  238  are mounted under the right fixing frame  203 . When both the left and right footing supports  104 ,  204  are folded, the whole tattoo chair can be moved freely on the six wheels, like a pushcart. The rod  234  of the “]”-shaped extension member  233  can be vertically inserted into the hollow protrusion  235  provided over the right end of the right fixing frame  203 , to be used as a handrail of the pushcart. 
         [0063]    Referring to  FIGS. 7 and 10 , in a further improved embodiment, the “]”-shaped extension member  233  comprises an outer rod  239 , an inner rod  240 , a lateral rod  241  and a soft cushion  242  surrounding the lateral rod  241 . The outer rod  239  is a hollow configuration and at least two location holes  243  are provided on the surface. The inner rod  240  is inserted into the outer rod  239 , and location bulges  244  are provided on the surface of inner rod  240 , which matches the location holes  243  on the outer rod  239 . 
         [0064]    Referring to  FIGS. 7 and 10 , in a further improved embodiment, at least two elastic straps  245  are hanged on the rod  234  of the “]”-shaped extension member  233 . 
         [0065]    Referring to  FIG. 10 , in a further improved embodiment, a lock buckle  145  is provided on the outer edge of left fixing frame  103 , and a lock handle  245  on the outer edge of the right fixing frame  203 , the lock buckle  145  and the lock handle  245  are matching each other. When the left part  100  and the right part  200  of the chair are folded completely, the lock handle  245  fastens the lock buckle  145 , inhibiting over rotation of the two parts. 
         [0066]    While embodiments of the invention have been illustrated and described, it is not intended that these embodiments illustrate and describe all possible forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the invention. Additionally, features of various implementing embodiments may be combined to form further embodiments of the invention.