Abstract:
A multi-functional child high chair includes a pair of incurved fore legs and a pair of incurved rear legs collapsibly connected by a pair of circular joints, a first stretcher connected the lower end of the fore legs including a pair of casters at two end, a second stretcher connected the lower end of the rear legs including two caster at each end, a pair of rotary positioning joint slidably sleeved on the upper portion of the fore legs respectively and axially connected to a chair seat therebetween. The chair seat has an angle of elevation adjustable chair back, a large and a small platform and an adjustable foot rest. The rotary positioning joints facilitate the ascent and descent of the chair seat along the guide groove of the fore legs. A pair of drag devices respectively disposed in the fore legs and controlled by the rotation of the circular joints. When the legs are collapsed and laid on the ground, the chair is swinging to and fro as a cradle and/or stably supported by a pair of spare supports to become a bed for a child.

Description:
BACKGROUND OF THE INVENTION 
   The present invention relates to children apparatus and more particularly to a multi-functional child high chair which is collapsible and in which the chair seat can be vertically adjustable, and wobbly to and fro as swinging on a swing. 
   The children high chair is available in the market and is varied in types. In the family or restaurant, this high chair is used to serve for a child to have meal together with its parents. Some of the high chairs can adjust their height in order to enable the child to reach the table and some of the high chairs directly make a releasable platform in front of the chair to facilitate the child to eat itself. However, these types of high chair only provide a single function. If wishes to cheer the child, one has to buy other children apparatus such as a wobbly playpen or a cradle. Therefore, if a collapsible multi-functional child high chair which facilitates the child to sit in, to feed on and to swing about is available, it will provide great convenience and happiness to the parents. 
   SUMMARY OF THE PRESENT INVENTION 
   The present invention has a main object to provide a multi-functional child high chair which is collapsible to reduce the volume to facilitate to collect or to pack for transportation. 
   Another object of the present invention is to provide a multi-functional child high chair in which the chair seat is vertically adjustable and wobbly to and fro as to swing on a swing. 
   Still another object of the present invention is to provide a multi-functional child high chair which includes a releasable platform in front of the chair seat to facilitate the child to have meal or to play toys thereon. 
   Further object of the present invention is to provide a multi-functional child high chair which provides a linking-up device to actuate a drag device in order to facilitate the chair seat to descend to a lowermost position. 
   Further object of the present invention is to provide a multi-functional child high chair when adjust the height of the chair seat, it always keeps horizontal state. 
   Further object of the present invention is to provide a multi-functional child high chair in which the angle of elevation of the chair back is adjustable to facilitate the child to lie on its back. 
   The present invention will become more fully understood by reference to the following detailed description thereof when read in conjunction with the attached drawings. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is an exploded perspective view to show the preferred embodiment of the child high chair of the present invention, 
       FIG. 2  is an assembly view and partially exploded perspective view to show the large and small platforms, the angle adjustment device and the stretchers, 
       FIG. 3  is a perspective view to show the assembly of  FIG. 2 , 
       FIG. 4  is a side view of  FIG. 3 , 
       FIG. 5  is a side view indicating the descent of the chair seat, 
       FIG. 6  is a side view to show the inner structure of the circular joint, 
       FIG. 7  is a sectional view of  FIG. 6 , 
       FIG. 8  is a side view to show the operation of the circular joint, 
       FIG. 9  is a sectional view of  FIG. 8 , 
       FIG. 10  is a sectional view to show a drag device inside the fore legs, 
       FIG. 11  is another sectional view of the drag device, 
       FIG. 12  is a sectional view to show an upper stopper of the drag device, 
       FIG. 13  is a sectional view to show that the upper stopper moves inward as a linking-up cord of the drag device is drawn upward, 
       FIG. 14  is a sectional view to show a rotary positioning joint on the fore legs, 
       FIG. 15  is a sectional view to show the rotary positioning joint moving downward, 
       FIG. 16  is a sectional view to show a small platform connected to the chair seat, 
       FIG. 17  is a sectional view to show the small platform simultaneously connected to the chair seat and a central upright support, 
       FIG. 18  is a side view to show the angle adjustment device on a chair back, 
       FIG. 19  is a side view to show the operation of the angle adjustment device, 
       FIG. 20  is a side view to show the structure of a foot rest under the chair seat, 
       FIG. 21  is a side view to show a guide rod sliding in a guide groove in the fore legs, 
       FIG. 22  is a side view to show the guide rod moved to an outlet of the guide groove, 
       FIG. 23  is a side view to show that the guide rod is escaped from the outlet and the fore and rear legs are collapsed, 
       FIG. 24  is a side view to show that the high chair of the present invention is in a motionless static, and 
       FIG. 25  is a side view to show that the high chair of the present invention is wobbling. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   With reference to  FIGS. 1 ,  2  and  3  of the drawings, the multi-functional child high chair of the present invention comprises generally a pair of fore legs  10 , a pair of rear legs  20 , two circular joints  30 , a chair seat  40 , a chair back  50 , two rotary positioning joints  60 , an angle adjustment device  70 , a small platform  80  and a pair of drag devices  90 . 
   The fore legs  10  and the rear legs  20  are relatively arcuate inward. A first stretcher  11  has a first caster seat  12  perpendicularly secured to each end and respectively sleeved onto the lower end of the fore legs  10 . Each of the first caster seats  12  has a caster  13  rotatably secured to lower end. The casters  13  can turn around to change direction for the chair. A second stretcher  21  has a second caster seat  22  perpendicularly secured to each end and respectively sleeved onto the lower end of the rear legs. Each of the second caster seats  22  has a pair of casters  23  coaxially secured to two lateral sides. The rear side of the upper portion of the fore legs  10  has a plurality of inclined surfaces  14  continuously formed (as shown in  FIG. 15 ) so as to define a plurality of shoulders  141  at their lower ends. The upper inner side of each fore leg  10  parallel connects a sliding bar  15  each of which has a guide groove  151  in the center along the length thereof (as shown in FIG.  21 ). The guide grooves  151  each has a transverse outlet  152  above their lower ends. 
   The two circular joints  30  are the some structure but symmetrically arranged. Each of the circular joints  30  is combined with an inner disk  31 , an outer disk  32  and an inner cap  33  co-axially and rotatably connected by an axial pin  34  (as shown in FIGS.  6  and  7 ). The inner disk  31  has a plurality of first stop blocks  312  spacedly formed around inner circumference, an arcuate guide slot  36  abutting an abnormal through hole  361  in a lower portion and a first sleeve  311  extended downward from a lower periphery for connecting itself to the upper end of the fore legs  10 . The outer disk  32  has a plurality of second stop blocks  323  spacedly formed around the inner circumference made engageable with the first stop blocks  312  for limiting the stretching angle between the fore and rear legs  10  and  20 , a small protrusion  324  on an upper inner surface for connecting a linking-up cord  94  of the drag device  90 , a stop plate  35  on an inner surface beneath the small protrusion  324 , a through hole  321  in a lower portion engageable with the abnormal through hole  361  for receiving a button  37  which is biased by a spring  372  and secured at fore end by a fixed plate  371  in the abnormal through hole  361  to prevent the inner and the outer disk  31  and  32  from rotation and a second sleeve  322  extended downward from an outer periphery for connecting itself to the upper end of the rear legs  20  each of which has a coupling seat  24  secured to a middle inner side. Each of the coupling seat  24  has a stop rod  241  and an axial rod  242  for rotatably securing a spare support  25  which has a long portion  251  toward the ground when the legs  10  and  20  are collapsed and a short portion  252  engageable with the stop rod  241  (as shown in  FIGS. 2 ,  3 ,  4  and  5 ). 
   The chair seat  40  (as shown in  FIGS. 1 and 2 ) has a pair of lateral walls  41  each of which has a through hole  42  in rear portion, a ring guide  45  on fore outer portion, a guide rod  451  inside the ring guide  45 , a guide plate  452  above the guide rod  451 , a lug  46  on an underside of the rear portion, a protudent triangular plate  47  on a top of the fore edge (as shown in FIGS.  17  and  18 ), and a horizontal U-shaped inlaid slit  43  centrally formed in an upper surface of the seat  40  for securing a central upright support  44  which has a rectangular plate  441  on bottom anchored within the U-shaped inlaid slit  43 . 
   The chair back  50  has a pair of hollow interior lateral walls each having an aligned through hole  53  above lower end engaged with the through holes  42  of the chair seat  40  and rotalably connected by two pairs of fasteners  51  each of which includes a pair of elastic hooks  52  at fore end (as shown in  FIGS. 1 ,  2  and  18 ) and a plurality of positioning grooves  54  on the back side of the chair back  50 . 
   The two rotary positioning joints  60  respectively and rotatably secured to the ring guides  45  of the chair seat  40  by a pair axial rod  61 , and each has a rectangular tube  62  including a longitudinal guide projected downward through the body to slidingly sleeve onto the upper portion of the fore legs  10  and attached on the sliding bars  15 , a positioning handle  63  pivoted to an outer surface of each of the rotary positioning joints  60  by an axial pin  631  and biased by a spring  633 , a pair of check rods  632  connected to the upper end of the positioning handle  63 . The check rods  632  have their forward end stopped against one of the shoulders  141  of the fore legs  10 , an opening  64  in the lower portion of each of the rotary positioning joints  60  including a stop edge to limit the movement of the guide rod  451  of the chair seat  40 . This arrangement aims to provide a relative rotation angle to the chair seat  40  and an outer cap  66  secured to the outer side of each of the rotary positioning joints  60  by screws  65 . The outer caps  66  each has an extension  661  covering the outer surface of the rectangular tube  62  (as shown in  FIGS. 1 ,  2 ,  3 ,  14  and  15 ). 
   Referring to  FIGS. 2 ,  16 ,  18 ,  19  and  20 , the angle adjustment device  70  comprises a rectangular plate  71  pivoted to a lug on the chair back  50  by an axial pin  72 . The plate  71  has a pair of side walls each including a bevel upper edge  73  and a concave lower edge  74 , a circular ring  75  centrally formed on an inner surface abutting the upper edge for anchoring one end of a spring  76  which has another end stopped against the chair back  50  for providing resilience to the rectangular plate  71  and an inverse U-shaped rod  77  having a pair of transverse ends  771  respectively engaged into the lugs  46  under the chair seat  40 , a transverse top being selectively engaged with one of the positioning groves  54  and the lateral portions confined by the concave lower edges  74  from moving outside of the plate  71 . If one pulls the lower end of the rectangular plate  71  outward, the lower portion of the plate  71  will leave the chair back  50  so as to set the inverse U-shaped rod  77  free to engage within any other positioning groove  54  to adjust the angle of elevation for the chair back  50 . Once the adjustment of the angle of elevation is achieved, release the rectangular plate  71  which will move back to its original position due to the resilience of the spring  76 . 
   Referring to  FIGS. 2 and 16 , a pair of symmetrically arranged side support plates  81  each has a clipping plate  811  including a rectangular hole in the center engaged with the protrudent triangular plates  47  of the chair seat  40  respectively and a pair of aligned rectangular through holes  813  spacedly formed under upper edge for engaging within a pair of hooked connecters  82  under the small platform  80 . The lateral edges of the small platform have a plurality of retaining slots  83  which are able to hold a pair of elastic inlaid blocks  851  under a large platform  85  which can be slid to and fro on the small platform  80 . Due to that the large platform  85  is made of plastic material, and the inlaid  851  blocks are elastic. 
   Referring to  FIGS. 1 ,  20  and  24 , a foot rest  86  is positioned under the chair seat  40  through a pair of connection tubes  861  which insert into a pair of sleeves  48  beneath the chair seat  40  and releasably secured by bolts  481 . So that the foot rest  86  is vertically adjustable. An inverse U-shaped collet  862  in cooperation with a catch  863  are formed under the lower end of the foot rest  86  which are provided to releasably clip the second stretcher  21  of the rear legs  20  when the legs  20  are collapsed in order to temporarily fix the chair seat  40 . 
   Referring to  FIGS. 1 ,  10 ,  11  and  12 , the pair of drag devices  90  are respectively disposed into the two fore legs  10  and each has a box  91  secured to a lower portion of the fore legs  10  by rivets  911 , an upper stopper  92  inserted into a through hole  16  of the fore legs  10  and confined within a movable guide  95  which is connected to an underside of a sliding plate  951 , a lower stopper  93  inserted into the box  91  via a through hole  17  of the fore legs  10  biased by a spring  931 , another spring  96  biased the top of the sliding plate  951  and a linking-up cord  94  having a lower end connected to the sliding plate  951 , an upper end connected to the small protrusion  324  of the outer disk  32  and a wrapper  941  stopped against the stop plate  35  (as shown in FIG.  6 ). The upper and lower stoppers  92  and  93  are normally protruded to outside of the fore legs  10 . When the inner disk  31  and the outer disk  32  of the circular joints  30  are rotated relatively, the movable guides  95  are lifted up to force the upper stopper  92  to move inside of the fore legs  10  in order to permit the rotary positioning joints  60  together with the chair seat  40  descending to the lower stopper  93  (as shown in FIG.  13 ). Referring to  FIGS. 3 ,  4  and  5 , when the fore legs  10  and the rear legs  20  are stretched and automatically fixed by the pair of circular joints  30 , the chair seat  40  is at an uppermost position. If tries to descend the chair seat  40  or to collapse the legs  10  and  20 , press simultaneously the positioning handles  63  of the rotary positioning joints  60 , the check rods  632  are actuated to leave the shoulders  141  of the fore legs  10  so as to permit the chair seat  40  descending to next shoulders  141 . Then release the handle handles  63 , the check rods  632  will automatically check on the next shoulders  141  to stop the chair seat  40 . Because of that the longitudinal guides of the rotary positioning joints  60  have the some curve as that of the fore legs  10 , the angle of elevation of the chair back  50  is kept unchanged. If ascends the chair seat  40 , it is no need to press the positioning handles  63  but just moves the chair seat upward, the check rods  632  will automatically slide along the inclined surface  14  and check into the upper shoulders  141  of the fore legs  10 . 
   Referring to  FIGS. 5 ,  6 ,  7 ,  8 ,  9 ,  21  and  22 , when the chair seat  40  descends to the upper stoppers  92 , simultaneously press the buttons  37  of the circular joints  30  to force the fixed plates  371  moving inward to take apart from the abnormal holes  361  and move to other end of the arcuate guides  36 . So that the inner desks  31  and the out disks  32  of the circular joints  30  can be able to rotate relatively to readily collapse the fore and rear legs  10  and  20 . The rotation of the outer disks  32  draws the linking-up cords  94  which lift the movable guides  95  upward that force the upper stoppers  92  moving into the fore legs  10 . Therefore, the rotary positioning joints  60  can be able to descend to the lowermost position and stop by the lower stoppers  93 . Meanwhile, the guide rods  451  of the ring guides  41  can slide out of the outlets  152  of the guide grooves  151 . But the guide plates  452  still remain outside of the guide grooves  151  to prevent the chair seat  40  from taking apart. 
   Referring to  FIGS. 24 and 25 , when the legs  10  and  20  are collapsed, put the rear legs  20  on the ground and the collet  862  and the catch  863  of the foot rest  86  clip the second stretcher  21  of the rear legs  20 . The chair seat  40  together with the chair back  50  are at center position. This time, the high chair of the present invention becomes a cradle for the child and can be able to swing to and fro to cheer up the child. If stops the swinging, and pulls the spare support  25  rearward, its short portion  252  will be checked by the stop rod  241  and its long portion  251  will stop against the ground. So that the chair becomes a stable bed for the child. 
   If props the chair again, stretches the fore and rear legs  10  and  20 , the buttons  37  will move from the arcuate guides  36  to the abnormal holes  361  and the fixed plates  371  will automatically anchor in the abnormal holes  361  due to resilience of the springs  372 . Then puts the guide rods  451  of the chair seat  40  into the guide grooves  151  via the outlets  152  to facilitate the vertical adjustment of the chair seat  40  until that the check rods  632  stop against the appropriate shoulders  141  of the fore legs  10 . 
   Referring to  FIG. 17 , which shows an alternate central upright support  44 ′ to replace the original central upright support  44  and which is not anchored in the horizontal U-shaped inlaid slit  43 . But has an aligned rectangular through hole  82  adjacent upper end to retain the hooked connector  82  from a center of the underside of the small platform  80 . This small modification has also the function of protecting the child. 
   Note that the specification relating to the above embodiment should be construed as exemplary rather than as limitative of the present invention, with many variations and modifications being readily attainable by a person of average skill in the art without departing from the spirit or scope thereof as defined by the appended claims and their legal equivalents.