Patent Publication Number: US-2012032483-A1

Title: Child chair having engaging assembly for seat

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This is a divisional application of Ser. No. 12/486,729 (filed on Jun. 17, 2009), which claims the priority of U.S. Provisional Applications No. 61/074,129 (filed on Jun. 19, 2008) , No. 61/091,724 (filed on Aug. 25, 2008) and No. 61/140,973 (filed on Dec. 28, 2008). The whole content of the related application is incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a child chair and, more particularly, to a child chair having an engaging assembly for selectively fastening a seat on a frame. Furthermore, the seat can be detached from the frame by operating the engaging assembly and then be placed on common chair for the purpose of increasing height of seat. 
     2. Description of the Prior Art 
     At the present time, child chair has been commonly used for an infant or child. The child chair can keep the infant or child close to a dining table while dining, so that a parent or other care giver can take care of the infant or child conveniently. Though there are various child chairs in the market, most of seats can only be mounted on a frame of a specific child chair. If the shape or size of the frame cannot fit the dining table, it will be inconvenient for parent or care giver while using the child chair. 
     SUMMARY OF THE INVENTION 
     The invention provides a child chair comprising a seat and a frame. The seat is detachably mounted on the frame. The frame comprises a coupling device for being coupled with the seat. The child chair comprises an engaging device movably mounted on one side of the seat. The engaging device is cooperated with the coupling device between a locking position and a release position relative to the seat. 
     According to the child chair of the invention, the frame comprises a front leg and a rear leg. The front leg comprises an upper front leg and a lower front leg. The upper front leg is mounted on a top of the lower front leg. The rear leg is pivotally connected to one of the upper front leg and the lower front leg. 
     The child chair of the invention comprises an engaging assembly. According to a first embodiment, the engaging assembly comprises the engaging device, the coupling device and a driving device. The engaging device comprises a first protruding portion. The driving device is movably mounted on the seat and connected to the engaging device so as to drive the engaging device to move from the locking position to the release position. The coupling device comprises a recess and a first guiding track. The recess is connected to the first guiding track. The first protruding portion is movable in the recess and the first guiding track so as to enable the engaging device to move between the locking position and the release position. 
     According to a second embodiment and a third embodiment of the invention, the coupling device of the engaging assembly comprises a support tube mounted on the frame. The engaging device is pivotally connected to the seat so as to be selectively engaged with or disengaged from the support tube. The driving device is movably mounted on the seat and pivotally connected to the engaging device. The driving device is used for driving the engaging device to rotate with respect to the seat so as to disengage the engaging device from the support tube. 
     According to a fourth embodiment of the invention, the engaging assembly further comprises a base mounted on a bottom side of the seat. The base comprises a guiding groove, the seat comprises a guiding rib corresponding to the guiding groove, and the guiding rib is movably coupled with the guiding groove. When the engaging device is disengaged from the support tube, the guiding groove moves along the guiding rib so as to protrude the base from the seat. 
     According to the invention, the child chair utilizes an engaging assembly to alternatively couple the seat with the frame or detach the seat from the frame. When the seat is detached from the frame, the seat can be placed on a common chair so as to fit the size of dining table or satisfy requirements of care giver. 
     These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view illustrating a child chair of the invention. 
         FIG. 2  is an exploded view illustrating the engaging assembly according to a first embodiment. 
         FIG. 3  is an outside view illustrating one side of the engaging assembly and the seat according to a first embodiment. 
         FIG. 4  is a schematic diagram illustrating the coupling device of the engaging assembly according to the first embodiment. 
         FIG. 5  is a schematic diagram illustrating the engaging device of the engaging assembly located at the locking position. 
         FIG. 6  is a schematic diagram illustrating the engaging device of the engaging assembly located at the release position. 
         FIG. 7  is a side view illustrating a child chair. 
         FIG. 8  is an exploded view illustrating parts of an engaging assembly according to a second embodiment. 
         FIG. 9  is a schematic diagram illustrating the engaging assembly located at the locking position. 
         FIG. 10  is a schematic diagram illustrating the engaging device engaged with the support tube at the locking position. 
         FIG. 11  is a schematic diagram illustrating the engaging assembly located at the release position. 
         FIG. 12  is an exploded view illustrating an engaging assembly according to a third embodiment. 
         FIG. 13  is a schematic diagram illustrating the engaging assembly located at a locking position. 
         FIG. 14  is a schematic diagram illustrating the engaging assembly located at a release position. 
         FIG. 15  is a side view illustrating the engaging assembly located at the locking position. 
         FIG. 16  is a side view illustrating the engaging assembly located at the release position. 
         FIG. 17  is a schematic diagram illustrating an engaging assembly according to a fourth embodiment, wherein the engaging assembly is located at a locking position relative to a base. 
         FIG. 18  is a schematic diagram illustrating the engaging device located at a release position and the base located at a protruding position. 
         FIG. 19  is a schematic diagram illustrating the engaging device abutting against the base when the base is located at the protruding position. 
         FIG. 20  is a schematic diagram illustrating a child chair according to a third embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION 
     Referring to  FIG. 1 ,  FIG. 1  is a perspective view illustrating a child chair  100  of the invention. The child chair  100  comprises a frame  1 , a seat assembly  2  and a tray  3 . The seat assembly  2  comprises a seat  21 , an engaging assembly  22  and a backrest  26 . The engaging assemblies  22  are mounted on both sides of the seat  21  respectively, so that the seat  21  is detachably mounted on the frame  1 . The seat  21  can be easily detached from the frame  1  by operating the engaging assemblies  22 . The tray  3  is disposed in the front of the seat assembly  2 . The frame  1  comprises a front leg  11 , a rear leg  12  and a connecting member  14 . The front leg  11  and the rear leg  12  are respectively connected to the connecting member  14 , such that the front leg  11  is pivotally connected to the rear leg  12  by the connecting members  14  mounted on both sides of the frame  1 . The connecting member  14  is mounted on a middle portion of the front leg  11 , and the rear leg  12  is therefore connected to the middle portion of the front leg  11 . The front leg  11  comprises an upper front leg  111  and a lower front leg  112 . The upper front leg  111  is adjustably mounted on a top of the lower front leg  112 . Accordingly, the height of the seat assembly  2  can be adjusted by lengthening or shortening the upper front leg  111  with respect to the lower front leg  112 . In this embodiment, since the connecting member  14  is mounted on the top of the lower front leg  112 , the rear leg  12  is pivotally connected to the lower front leg  112 . However, in another embodiment, the rear leg  12  also can be pivotally connected to the upper front leg  111  of the front leg  11 . Furthermore, a wheel mechanism  15  can be mounted on a lower end of at least one of the front leg  11  and the rear leg  12 , such that the child chair  100  can be easily moved by a user. 
     Referring to  FIG. 2 ,  FIG. 2  is an exploded view illustrating the engaging assembly  22  according to a first embodiment. The engaging assembly  22  comprises a coupling device  13 , a driving device  221 , an engaging device  222 , a first resilient member  223  and a casing  224 . In this embodiment, the driving device  221  can be a button and the first resilient member  223  can be a spring. The coupling device  13  is mounted on a top of the front leg  11 . The engaging device  222  is coupled with the coupling device  13  so as to fasten the seat  21  on the frame  1 . Preferably in this embodiment, two engaging devices  222  are symmetrically mounted on both sides of the seat  21  and two coupling devices are also symmetrically mounted on the top of the front leg  11 . The driving device  221  passes through the seat  21  from outside to inside. The engaging device  222  movably passes through the seat  21  from inside to outside. Both ends of the first resilient member  223  abut against the casing  224  and an abutting portion  2221  of the engaging device  222  respectively. The casing  224  covers the engaging device  222  and the first resilient member  223  and is fastened on the seat  21 . The engaging device  222  is cooperated with the coupling device  13 , the driving device  221  and the first resilient member  223  to keep the seat  21  at a locking state or a release state. The driving device  221  is movably mounted on the seat  21  and connected to the engaging device  222 . The driving device  221  can drive the engaging device  222  to move from a locking position to a release position relative to the seat  21 . On the other hand, the first resilient member  223  can drive the engaging device  222  to move from the release position to the locking position relative to the seat  21 . Accordingly, the seat  21  can be detached from or attached to the frame  1 . 
     Referring to  FIGS. 3 to 6  along with  FIG. 2 ,  FIG. 3  is an outside view illustrating one side of the engaging assembly  22  and the seat  21 ,  FIG. 4  is a schematic diagram illustrating the coupling device  13  of the engaging assembly  22  according to the first embodiment,  FIG. 5  is a schematic diagram illustrating the engaging device  222  of the engaging assembly  22  located at the locking position, and  FIG. 6  is a schematic diagram illustrating the engaging device  222  of the engaging assembly  22  located at the release position. As shown in  FIG. 4 , the coupling device  13  of the first embodiment comprises a recess  136  and a first guiding track  137 . The recess  136  is formed along a second direction N 2 , adjacent to the first guiding track  137  and communicated with the first guiding track  137 . The recess  136 , which is along the second direction N 2 , cooperates with the first guiding track  137 , which is along a third direction N 3 , to form an L-shaped groove. As shown in  FIGS. 2 and 5 , the engaging device  222  comprises two first protruding portions  2226  and a second guiding track  2225 . The protruding portions  2226  pass through the seat  21  from inside to outside and are movable in the L-shaped groove formed by the recess  136  and the first guiding track  137 , such that the protruding portion  2226  can be engaged with the recess  136  (the engaging device  222  is located at the locking position at this moment) or the protruding portion  2226  can move away from the first guiding track  137  (the engaging device  222  is located at the release position at this moment). As shown in  FIGS. 5 and 6 , the second guiding track  2225  is oblique and has a first abutting position A and a second abutting position B along a first direction N 1 . In this embodiment, the second abutting position B is closer to the first protruding portion  2226  of the engaging device  222  than the first abutting position A. The driving device  221  comprises a second protruding portion  2214 . The second protruding portion  2214  passes through the seat  21  from outside to inside and extends to the second guiding track  2225 . As shown in  FIG. 5  along with  FIGS. 3 and 4 , the seat  21  is situated at the locking state, the first protruding portion  2226  is located in the recess  136 , the second protruding portion  2214  is located at the first abutting position A, and the engaging device  222  is located at the locking position. At this moment, the seat  21  is engaged with the frame  1 . As shown in  FIG. 6 , to detach the seat  21  from the frame  1 , the driving device  221  may be pulled along the first direction N 1  (i.e. release direction) so as to move the second protruding portion  2214  from the first abutting position A to the second abutting position B in the second guiding track  2225 . Afterward, the second protruding portion  2214  drives the engaging device  222  to move from the locking position (as shown in  FIG. 5 ) to the release position (as shown in  FIG. 6 ). At the same time, the first resilient member  223  is compressed between the casing  224  and the engaging device  222  so as to generate a bias force. As shown in  FIG. 4 , since the engaging device  222  is driven by the driving device  221 , the first protruding portion  2226  of the engaging device  222  moves from the locking position in the recess  136  to the release position in the first guiding track  137  along the second direction N 2 . Consequently, the seat  21  can be detached from the frame  1  along the first guiding track  137 . 
     When the engaging device  222  is located at the release position and the driving device  221  is released, the bias force generated by the first resilient member  223  will drive the engaging device  222  to move from the release position to the locking position. Therefore, when the seat  21  is attached to a support tube  6  of the frame  1  via an engaging groove  225  again, the first protruding portion  2226  of the engaging device  222  moves along the first guiding track  137  to the side of the recess  136 , and then the first resilient member  223  forces the first protruding portion  2226  of the engaging device  222  into the recess  136 . Consequently, the first protruding portion  2226  of the engaging device  222  is engaged with the recess  136  again and the seat  21  is fastened on the frame  1 . 
     As shown in  FIGS. 3 and 4 , the coupling device  13  comprises a guiding rib  135  and the seat  21  comprises a guiding groove  214  corresponding to the guiding rib  135 . When the seat  21  is detached from the frame  1 , the rib  135  may cooperate with the guiding groove  214 , such that the seat  21  can be detached from the frame  1  along a predetermined direction. It should be noted that though the second guiding track  2225  of this embodiment is oblique, the shape of the second guiding track  2225  of the invention is not limited to any specific shape. That is to say, the features of the invention are to drive the engaging device  222  to move along the second direction N 2  and to move the engaging device  222  from the locking position to the release position, so as to make the first protruding portion  2226  away from the recess  136 . 
     Referring to  FIGS. 7 and 8 ,  FIG. 7  is a side view illustrating a child chair  200 , and  FIG. 8  is an exploded view illustrating parts of an engaging assembly  23  according to a second embodiment. The child chair  200  comprises a frame  1  and a seat assembly  2 . The seat assembly  2  comprises a seat  21  and an engaging assembly  23 . The main difference between the first and second embodiments is that the engaging assembly  23  can be implemented in different manners. In this embodiment, the engaging devices of the engaging assembly  23  are mounted on both sides of the seat  21 . The coupling device is mounted on the frame  1  and below the seat  21  and have a support tube  6  (shown in  FIG. 9 ). 
     The engaging assembly  23  comprises a driving device  231 , an engaging device  232 , a support tube  6  and a first resilient member  233 . The first resilient member  233  can be a spring. The engaging device  232  is pivotally connected to the seat  21  and capable of rotating with respect to the seat  21  so as to be engaged with or disengaged from the support tube  6 . In this embodiment, the driving device  231  comprises a button  2311  and a connecting member  2313 . The button  2311  is movably mounted on the seat  21  from outside to inside and connected to the connecting member  2313 . The connecting member  2313  is pivotally connected to the engaging device  232 . Both ends of the first resilient member  233  are respectively connected to a protrusion  216  of the seat  21  and the connecting member  2313  of the driving device  231 . The engaging assembly  23  can be cooperated with the support tube  6  to keep the seat  21  at a locking state or a release state. That is to say, the engaging device  232  can be cooperated with the driving device  231  and the first resilient member  233 , such that the driving device  231  can drive the engaging device  232  to rotate with respect to the seat  21  so as to disengage the engaging device  232  from the support tube  6 . In other words, the engaging device  232  can be driven by the driving device  231  to rotate from a locking position to a release position or be driven by the first resilient member  233  to move from the release position to the locking position. Accordingly, the seat  21  can be alternatively detached from or attached to the frame  1 . 
     Referring to  FIGS. 9 to 11  along with  FIG. 8 ,  FIG. 9  is a schematic diagram illustrating the engaging assembly  23  located at the locking position,  FIG. 10  is a schematic diagram illustrating the engaging device  232  engaged with the support tube  6  at the locking position, and  FIG. 11  is a schematic diagram illustrating the engaging assembly  23  located at the release position. As shown in  FIGS. 8 and 9 , the seat  21  comprises two slots  215  and a protrusion  216 , the button  2311  comprises two screw pillars  2312 , the engaging device  232  comprises a hook  2323 , a first hole  2321  and a second hole  2322 , and the connecting member  2313  comprises a cross rib  2314 , two first holes  2315  and a second hole  2316 . Both ends of the first resilient member  233  are respectively connected to the protrusion  216  and the cross rib  2314 . The screw pillars  2312  movably pass through the slots  215  and are fastened to the first holes  2315  of the connecting member  2313 . The second hole  2316  of the connecting member  2313  is pivotally connected to the first hole  2321  (shown in  FIG. 8 ) of the engaging device  232 . The second hole  2322  is pivotally connected to the seat  21  by a pivot  217 , such that the engaging device  232  can rotate on the pivot  217 . 
     As shown in  FIGS. 9 and 10 , the slots  215  has a first abutting position C and a second abutting position D along a fourth direction N 4 . When the engaging device  232  is located at the locking position as shown in  FIG. 9 , the hook  2323  of the engaging device  232  hooks the support tube  6  so as to engage the seat  21  with the frame  1 . At this moment, the button  2311  is located at the first abutting position C. As shown in  FIG. 11 , when a user wants to detach the seat  21  from the frame  1 , he or she has to pull the button  2311  along a fourth direction N 4  so as to drive the button  2311  to move from the first abutting position C to the second abutting position D along the fourth direction N 4  in the slots  215 . At the same time, the button  2311  drives the connecting member  2313  to move upwardly along the fourth direction N 4  and drives the engaging device  232  to rotate on the pivot  217 . The first resilient member  233  is compressed. When the engaging device  232  rotates to the release position, the hook  2323  is away from the support tube  6 . As shown in  FIG. 11 , the seat can be detached from the frame  1 . 
     After releasing the button  2311 , the compressed first resilient member  233  will drive the connecting member  2313  and the engaging device  232  back to the position shown in  FIG. 9 , but the seat  21  has been detached from the frame  1  at this moment. When the user wants to attach the seat  21  to the frame  1  again, he or she has to pull the button  2311  along the fourth direction N 4  and then the engaging device  232  is driven by the connecting member  2313  back to the release position. Furthermore, a bottom side of the hook  2323 , which is opposite to a bottom surface of the seat  21 , has an incline surface  2324 . That is to say, there is an incline between the hook  2323  and an external force for pushing the seat  21  downwardly. To attach the seat  21  to the frame  1 , the seat  21  may be pushed down directly. Afterwards, the support tube  6  abuts against the incline surface  2324  of the hook  2323 , such that a component of the external force will drive the engaging device  232  to rotate. Therefore, the user can attach the seat  21  to the frame  1  directly without pressing the button  2311 . 
     After fastening the seat  21  to the frame  1 , the driving device  231  is released and a bias force generated by the first resilient member  233  drives the engaging device  232  to rotate from the release position to the locking position. Consequently, the hook  2323  is engaged with the support tube  6  and the seat  21  is fastened on the frame  1 . 
     Referring to  FIG. 12 ,  FIG. 12  is an exploded view illustrating an engaging assembly  24  according to a third embodiment. As shown in  FIG. 12 , the seat  21  further comprises a cover  218 . The engaging assembly  24  is mounted on the cover  218  and comprises a driving device  241 , an engaging device  242 , a support tube  6  and a first resilient member  243 . In this embodiment, the driving device  241  is a button and the first resilient member  243  is a spring. The driving device  241  movably passes through the seat  21  from outside to inside. The engaging device  242  is pivotally connected to the cover  218  and the driving device  241 , such that the engaging device  242  can be engaged with or disengaged from the support tube  6 . Both ends of the first resilient member  243  are respectively connected to the cover  218  and the engaging device  242 . The engaging device  242  can move between a release position and a locking position by operating the driving device  241  and the bias force generated by the first resilient member  243 . Accordingly, the seat  21  can be alternatively detached from or attached to the frame  1 . 
     Referring to  FIGS. 13 to 16 ,  FIG. 13  is a schematic diagram illustrating the engaging assembly  24  located at a locking position,  FIG. 14  is a schematic diagram illustrating the engaging assembly  24  located at a release position,  FIG. 15  is a side view illustrating the engaging assembly  24  located at the locking position, and  FIG. 16  is a side view illustrating the engaging assembly  24  located at the release position. As shown in  FIGS. 12 ,  13  and  15 , the engaging device  242  comprises a hook  2423 , a first hole  2421  and a second hole  2422 , and the driving device  241  comprises an engaging groove  2411 . The first hole  2421  of the engaging device  242  is pivotally connected to the engaging groove  2411  of the driving device  241  by a pin  245 . The second hole  2422  is pivotally connected to the seat  21  by a pivot  217 ′, such that the engaging device  242  can rotate on the pivot  217 ′. As shown in  FIGS. 13 and 15 , when the engaging device  242  is located at the locking position, the hook  2423  of the engaging device  242  hooks the support tube  6  so as to engage the seat  21  with the frame  1 . 
     As shown in  FIGS. 14 and 16 , when the driving device  241  is pulled upwardly along a fifth direction N 5  (i.e. release direction), the engaging device  242  is driven by the driving device  241  to rotate with respect to the pivot  217 ′. The hook  2423  moves away from the support tube  6  and the engaging device is located at the release position. Accordingly, the seat  21  can be detached from the frame  1 . Then, once the button  241  is released, the compressed first resilient member  243  will force the engaging device  242  back to the position shown in  FIG. 13 , but the seat has been detached from the frame  1 . When the user wants to attach the seat  21  to the frame  1  again, he or she has to pull the driving device  241  upwardly along the fifth direction N 5  and then the engaging device  242  will be located at the release position again. After placing the seat  21  on the frame  1  and releasing the button  241 , a bias force generated by the first resilient member  243  will drive the engaging device  242  to rotate from the release position to the locking position. Then, the hook  2423  is engaged with the support tube  6  and the seat  21  is fastened on the frame  1 . 
     Referring to  FIGS. 17 and 18 ,  FIG. 17  is a schematic diagram illustrating an engaging assembly  25  according to a fourth embodiment, wherein the engaging assembly  25  is located at a locking position relative to a base  27 , and  FIG. 18  is a schematic diagram illustrating the engaging device  25  located at a release position and the base  27  located at a protruding position. The engaging assembly  25  comprises a driving device  251 , an engaging device  252 , a support tube  6  and a first resilient member  253 . The driving device  251  comprises a button  2511  and a connecting member  2512 . The principle and function of each component of the engaging assembly  25  are the same as those of the engaging assembly  23  and are not described in detail here. 
     In this embodiment, the child chair  200  further comprises a base  27 . The base is slidably mounted on the bottom side of the seat  21 . The base  27  has a protruding position and a fastening position relative to the seat  21 . When the seat  21  is fastened on the frame, the base  27  is located at the fastening position as shown in FIG.  17 . The base  27  comprises a load bearing platform  271  and two guiding grooves  273 . The seat  21  comprises two guiding ribs  219 . The engaging device  252  comprises a block  2525 . The engaging assembly  25  further comprises a second resilient member  255 . The second resilient member  255  can be a spring. Both ends of the second resilient member  255  are respectively connected to a recess  277  of the base  27  and one end of the guiding rib  219 . The guiding groove  273  of the base  27  can move along the guiding rib  219  of the seat  21  in a sixth direction N 6 , such that the base  27  can be alternatively protruded from or retracted into the seat  21  in the sixth direction N 6 . When the engaging device  252  is located at the locking position, the base  27  is retracted into the seat  21  and the second resilient member  255  is compressed. When the engaging device  252  is located at the release position, the hook  2523  is away from the support tube  6  and the block  2525  is away from the load bearing platform  271 . Then, the second resilient member  255  generates a bias force for moving the guiding groove  273  of the base  27  along the guiding rib  219  in the sixth direction N 6 , so as to protrude the base  27  from the seat  21 . 
     As shown in  FIG. 19 , after releasing the hook  2523 , the block  2525  abuts against the load bearing platform  271 , such that the base  27  is kept at the protruding position relative to the seat  21 . Accordingly, the seat assembly  2  can be placed on a common chair for the purpose of increasing height of seat. When the base  27  is located at the protruding position relative to the seat  21 , the engaging groove  225  (shown in  FIG. 17 ) of the seat  21  is blocked by the base  27 . Therefore, the seat  21  cannot be coupled with the support tube  6  so as to prevent the seat  21  from being attached to the frame  1  while the base  27  is located at the protruding position. Accordingly, the dangerous due to mis-operation can be avoided. As shown in  FIG. 19 , since the block  2525  abuts against the load bearing platform  271 , the base cannot be retracted into the seat  21  even if an infant or child is sitting on the seat  21 . When the user wants to attach the seat  21  to the support tube  6 , he or she has to press the button  241  to drive the engaging device  252  to move the block  2525  away from the load bearing platform  271 . Then, the guiding groove  273  of the base  27  can move along the guiding rib  219  in the sixth direction N 6  and the base  27  can be retracted into the seat  21 . At this moment, the hook  2523  can be engaged with the support tube  6  again to fasten the seat  21 . 
     Moreover, the support tube  6  disclosed in the aforesaid embodiments can also be implemented by a transverse support rod of the frame. Therefore, the engaging assembly just comprises the engaging device, the driving device, the resilient member, and so on. The engaging device can be engaged with the support rod of the frame directly so as to fasten the seat on the frame. 
     Please refer to  FIG. 20 . In a child chair  300  according to another embodiment, two guiding tracks  211  respectively protrude from both sides of the seat  21  and two guiding grooves  110  are respectively formed on both sides of the upper front leg  111  of the frame  1 . When attaching the seat  21  to the frame  1 , the guiding tracks  211  of the seat  21  have to be aligned with the guiding grooves  110 . Since the guiding tracks  211  are movable in the corresponding guiding grooves  110 , the seat  21  can be attached to the frame  1  and fastened on the frame  1  by the aforesaid engaging assembly. Furthermore, this design can reduce the hazard of false engagement between the seat  21  and the frame  1 . In case the seat  21  is not engaged well, the guiding tracks  211  accommodated in the guiding grooves  110  can prevent overturning of the seat  21 . 
     The invention discloses a child chair having an engaging assembly. The child chair comprises a seat, a frame and the engaging assembly. The engaging assembly is mounted on both sides of the seat and the frame. A user can operate the engaging assembly to detach the seat from the frame easily and then place the seat on common chair. Furthermore, the engaging assembly comprises an engaging device of the seat coupled with a coupling device of the frame. When the engaging device is coupled with the coupling device, the engaging device is located at a locking position. When the driving device disengages the engaging device from the coupling device, the engaging device moves from the locking position to a release position, such that the seat can be detached from the frame. 
     Moreover, the engaging assembly can cooperate with a base below the seat so as to achieve more functions. When the engaging device is located at the locking position, the base is retracted into the seat. When the engaging device is located at the release position, the base protrudes from the seat, such that the seat can be placed on a common chair easily to achieve the purpose of increasing height of seat. It should be noted that the aforesaid first, fourth, fifth and sixth directions represent the directions while the driving (or button) drives the engaging device to move from the locking position to the release position, but the main feature of the invention is to move the engaging device to the release position and not limited to those embodiments mentioned in the above. 
     Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.