Patent Publication Number: US-10306987-B2

Title: Swing chair

Description:
TECHNICAL FIELD 
     The present invention relates to a swing chair, and more particularly, to a swing chair which easily swings by an external force of a user even without a separate power source. 
     BACKGROUND ART 
     In a general swing, a user is seated in a seat portion and shakes the entire body forward/rearward to generate an inertial force so as to rotate the swing forward or rearward. 
     However, in the general swing, a process in which the swing is rotated rearward at an initial time in order to obtain an inertial force, and is then moved forward should be repeatedly performed, and at the same time, legs should be shaken forward or rearward to maintain the inertial force. Thus, it is difficult and inconvenient to use the swing. 
     Further, in a generally-used automatically-shaken swing, because a separate driving device such as a motor, complex gears, and the like are added to the swing to rotate the swing, a configuration of the swing is complex, manufacturing costs thereof increase, and separate electricity charges are charged. 
     Thus, a method for solving the above problems is required. 
     DISCLOSURE 
     Technical Problem 
     The present invention has been conceived to solve the above-described problems, and a swing chair includes a support, a main operation member, a sub operation member, a seat portion, and a rotation connecting member, so that an operation structure for the swing chair is simplified. 
     The support, the main operation member, the sub operation member, and the rotation connecting member are arranged to form a virtual sealed quadrangle, so that the main operation member and the seat portion are interlocked with each other according to the virtual quadrangle to be moved forward about the first rotation axis. 
     With respect to the third rotation axis, the length of a front portion of the rotation connecting member is large and the length of a rear portion of the rotation connecting member is small. Thus, according to the principle of the lever, even when a user applies a small force, the rotation connecting member is rotated by a large force, and thus, the seat portion in which the user is seated is easily moved forward, so that the swing chair may be used for lower body exercise of the elderly person. 
     A separate operation handle is provided in the rotation connecting member, and the user moves the operation handle in a front-rear direction without stepping on a foothold, so as to swing the seat portion in the front-rear direction. 
     A handle is installed in the seat portion or the rotation connecting member, so that a guardian swings the swing chair in which the child or the elderly person is seated, in the front-rear direction using the handle. 
     The main operation member or the sub operation member is selectively formed in the shape of a wire or a frame, so that the swing chair having various forms may be manufactured. 
     Problems of the present application are not limited to the above-described problems, and yet other non-mentioned problems could be clearly understood by those skilled in the art with reference to the following descriptions. 
     Technical Solution 
     In order to achieve the above aspects, it is preferable that a swing chair according to the present invention includes a support which is installed at a certain height or more above the floor, a main operation member which is elongated and has a virtual first rotation axis provided to the support at one side thereof and which is rotatably coupled to the support, a sub operation member which is elongated and has a virtual second rotation axis spaced parallel to the first rotation axis, and which is rotatably coupled to the support, a seat portion coupled to either of the main operation member or the sub operation member, and a rotation connecting member which is elongated and arranged in a front-rear direction and has a rear portion that is rotatably coupled to the other side of the main operation member and a front portion that is rotatably coupled to the other side of the sub operation member so that a closed virtual quadrangle is formed together with the support, the main operation member, and the sub operation member, wherein an angle of coupling between the rotation connecting member and the main operation member is changed according to user&#39;s operation and the main operation member is interlocked with the virtual quadrangle and swings forward and backward based on the first rotation axis. 
     It is preferable that a portion of the rotation connecting member protrudes forward in a longitudinal direction. 
     It is preferable that the rotation connecting member vertically swing about a point of coupling between the rotation connecting member and the sub operation member. 
     It is preferable that when an external force is applied to a front portion of the rotation connecting member to rotate the rotation connecting member rearward, an interior angle of coupling between the rotation connecting member and the main operation member increases in the virtual quadrangle. 
     It is preferable that a coupling position of the rotation connecting member and the sub operation member is adjusted along a longitudinal direction. 
     It is preferable that the rotation connecting member is extended and contracted along a longitudinal direction. 
     It is preferable that the rotation connecting member is adjusted in a state in which a user is seated in the seat portion. 
     It is preferable that a front portion of the rotation connecting member along the longitudinal direction is formed in the shape of a foothold, so that the user operates the rotation connecting member using his/her feet while being seated in the seat portion. 
     It is preferable that a separate operation handle is provided in front of a point of coupling between the rotation connecting member and the sub operation member, so that the rotation connecting member is arranged at a position where the user approaches the rotation connecting member while being seated in the seat portion. 
     It is preferable that at least a portion of the main operation member in the longitudinal direction is formed in the shape of a wire. 
     It is preferable that the seat portion is fixedly coupled to the main operation member. 
     It is preferable that an area of the main operation member, which is arranged below the seat portion along the longitudinal direction, is formed in the shape of a frame. 
     It is preferable that the sub operation member is formed in the shape of a wire. 
     The swing chair may further include a separate auxiliary support member which is elongated, and has one side that is connected to the support and the other side that is connected to the seat portion. 
     It is preferable that the auxiliary support member is formed in the shape of a wire. 
     It is preferable that the main operation member is formed in the shape of a frame, and the sub operation member is formed in the shape of a wire. 
     It is preferable that the seat portion is fixedly coupled to a lower portion of the main operation member. 
     It is preferable that the seat portion is fixedly coupled to a lower portion of the sub operation member. 
     It is preferable that the main operation member is formed in the shape of a wire, and the sub operation member is formed in the shape of a frame. 
     It is preferable that the seat portion is fixedly coupled to a lower portion of the main operation member. 
     It is preferable that the main operation member and the sub operation member are formed in the shape of a frame. 
     It is preferable that the first rotation axis and the second rotation axis are spaced apart from each other in a front-rear direction, and are coupled to the support. 
     It is preferable that a handle is further provided in at least one of the seat portion and the rotation connecting member. 
     It is preferable that the main operation member is provided in plurality, the main operation members are spaced apart from each other on the first rotation axis, and the seat portion is fixedly coupled between the main operation members. 
     It is preferable that the sub operation member is provided in plurality, the sub operation members are spaced apart from each other on the second rotation axis, and the seat portion is fixedly coupled between the sub operation members. 
     The seat portion may further include a cradle. 
     The seat portion or the rotation connecting member may further include a massage means. 
     The seat portion may further include a means configured to measure physical information. 
     Advantageous Effects 
     A swing chair according to the present invention for solving the above problems has the following effects. 
     First, a swing chair includes a support, a main operation member, a sub operation member, a seat portion, and a rotation connecting member so that a structure for manufacturing the swing chair may be simplified, and manufacturing costs thereof may be reduced. 
     Second, even when a user applies a small force to a foothold using the principle of the lever, the swing chair easily swings forward or rearward without a separate power source, so that the swing chair may be used for lower body exercise of the elderly. 
     Third, a separate operation handle is provided in the rotation connecting member, and the user moves the operation handle in a front-rear direction without stepping on a foothold, so as to swing the seat portion in the front-rear direction. 
     Fourth, when the user is the child or the elderly person, a guardian moves the handle forward or rearward to swing the swing chair. 
     Fifth, a cradle is provided in the seat portion, so that the user may care for young babies. 
     Sixth, a massage means is provided in the seat portion or the rotation connecting member, thereby relieving fatigue of the user. 
     Seventh, a means configured to measure physical information is provided in the seat portion to recognize a health state of the elderly person. 
     Effects of the present invention are not limited to the above-described effects, and other not-mentioned effects could be clearly understood by those skilled in the art with reference to the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above-described abstract as well as the detailed description of embodiments of the present application, which will be described below, could be better understood when read in conjunction with the accompanying drawings. The embodiments are illustrated in the drawings for the purpose of describing the present application. However, it should be understood that the present application is not limited to accurate arrangements and means which are illustrated. 
         FIG. 1  is a view illustrating the entire shape of a swing chair according to a first embodiment of the present invention; 
         FIGS. 2 and 3  are views illustrating an operation structure which is commonly applied to a swing chair according to first to sixth embodiments of the present invention; 
         FIGS. 4 to 6  are views illustrating a state in which the swing chair according to the first embodiment of the present invention is operated; 
         FIG. 7  is a view illustrating a state in which a cradle and a handle are provided in the swing chair according to the first embodiment of the present invention; 
         FIG. 8  is a view illustrating a state in which a massage means is provided in the swing chair according to the first embodiment of the present invention; 
         FIG. 9  is a view illustrating the entire shape of a swing chair according to the second embodiment of the present invention; 
         FIG. 10  is a side view illustrating the swing chair according to the second embodiment of the present invention; 
         FIG. 11  is a view illustrating the entire shape of a swing chair according to the fifth embodiment and the sixth embodiment of the present invention; and 
         FIG. 12  is a side view illustrating the swing chair according to the fifth embodiment and the sixth embodiment of the present invention. 
     
    
    
     BEST MODE FOR THE INVENTION 
     Hereinafter, exemplary embodiments of the present invention, which may implement the aspects of the present invention in detail, will be described with reference to the accompanying drawings. In description of the present embodiment, the same elements are designated by the same names and the same reference numerals, and additional description according thereto will be omitted. Further, in description of embodiments of the present invention, it is specified that configurations illustrated in the drawings are merely examples for assisting in understanding of the detailed description, the shapes of the configurations may be varied without limitation, and the scope of the rights is not limited due to the detailed description. 
     Referring to  FIG. 1 , a swing chair according to the present invention schematically includes a support  100 , a main operation member  200 , a sub operation member  300 , a seat portion  400 , and a rotation connecting member  500 . 
     The swing chair according to the present invention may further include pillars  50 , and it is preferable that the pillars  50  are installed on a floor to be spaced apart from each other in pairs in consideration of a weight of the swing chair and a weight of a user as in the present embodiment. 
     The support  100  is installed to connect upper portions of the pillars  50  to each other so as to be located at a certain height or more above the floor. 
     The support  100  may be installed between a wall and another adjacent wall to be located at a certain height or more above the floor. 
       FIG. 1  is a perspective view illustrating a swing chair according to a first embodiment of the present invention,  FIGS. 2 and 3  are views illustrating an operation structure which is commonly applied to a swing chair according to first to sixth embodiments of the present invention, and  FIGS. 4 to 6  are views illustrating a state in which the swing chair according to the first embodiment of the present invention is operated. 
     Referring to  FIGS. 1 to 4 , the main operation member  200  is elongated and is rotatably coupled to the support  100  on one side thereof to have a virtual first rotation axis L 1 . Further, the main operation member  200  is provided in plurality, and the main operation members  200  are transversely spaced apart from each other on the first rotation axis L 1 . 
     The sub operation member  300  is elongated, has a virtual second rotation axis L 2  on one side thereof, which is spaced parallel to the first rotation axis L 1  by a predetermined distance, and is rotatably coupled to the support  100 . 
     That is, in the present embodiment, the sub operation member  300  is rotatably coupled to the support  100  to be spaced parallel to the first rotation axis L 1  on the upper side thereof. 
     Further, the sub operation member  300  is provided in plurality, and the sub operation members are transversely spaced apart from each other on the second rotation axis L 2 . 
     Various rotatable connection means such as a connection hook and a bracket may be used as the virtual first rotation axis L 1  and the virtual second rotation axis L 2 . 
     Referring to  FIGS. 1 and 4 , the seat portion  400  is fixed and coupled between the main operation members  200  spaced apart from each other. 
     At least a portion of the main operation member  200  in the longitudinal direction thereof is formed in the shape of a wire, and an area of the main operation member  200 , which is disposed below the seat portion  400  in the longitudinal direction, is formed in the shape of a frame. That is, the main operation member  200  according to the present embodiment includes a wire and a frame. 
     As illustrated, an upper portion of the main operation member  200  in the form of a wire in the longitudinal direction thereof is rotatably connected to the support  100 , and a lower portion of the main operation member  200  in the form of a wire is fixed and coupled to the seat portion  400 , and the frame is coupled to a lower portion of the seat portion  400 . 
     Further, an auxiliary support member  270  is further provided such that the seat portion  400  is stably installed in the main operation member  200 . The auxiliary support member  270  is elongated in the form of a wire, is rotatably connected to the support  100  on one side thereof, and is connected to the seat portion  400  on the other side thereof. 
     The rotation connecting member  500  is elongated and arranged in a front-rear direction, is rotatably coupled to the other side of the frame of the main operation member  200  on the rear side thereof to have a virtual fourth rotation axis L 4 , and is rotatably connected to the other side of the sub operation member  300  on the front side thereof to have a virtual third rotation axis L 3 . Thus, the rotation connecting member  500  is connected to be vertically rotatable about the third rotation axis L 3  serving as a point of coupling between the rotation connecting member  500  and the sub operation member  300 . 
     Various rotatable connection means such as a connection hook and a bracket may be used as the virtual third rotation axis L 3  and the virtual fourth rotation axis L 4 . 
     Accordingly, as illustrated in  FIG. 2 , the rotation connecting member  500  is arranged to form a virtual sealed quadrangle together with the support  100 , the main operation member  200 , and the sub operation member  300 . 
     Further, although not illustrated in the drawing, the entire main operation member  200  may be formed in the shape of a wire. In this case, the seat portion  400  is installed at a lower portion of the main operation member  200  having the form of a wire by using a separate coupling means, and the rear portion of the rotation connecting member  500  is rotatably coupled to the other side of the main operation member  200  having the form of a wire to have the virtual fourth rotation axis L 4 . 
     A portion of the rotation connecting member  500  protrudes forward along a longitudinal direction thereof. 
     In the present embodiment, the rotation connecting member  500  protrudes and extends from the front side of the third rotation axis L 3  rotatably coupled to the other side of the sub operation member  300 . 
     As illustrated in  FIG. 1 , a front portion of the rotation connecting member  500 , which protrudes along a longitudinal direction thereof, is formed in the shape of a foothold or a separate foothold  520  is provided in the rotation connecting member  500 , so that a user may perform an operation by using his/her foot while being seated in the seat portion  400 . 
     Referring to  FIGS. 2, 4, and 5 , when the user is seated in the seat portion  400  and transfers an external force for pressing the foothold  520  provided in the rotation connecting member  500 , the rotation connecting member  500  is rotated in a direction in which an interior angle A of coupling between the rotation connecting member  500  and the main operation member  200  increases. That is, in a state in which the swing chair is stopped, the rotation connecting member  500  is rotated such that the interior angle A of coupling between the rotation connecting member  500  and the main operation member  200  increases to A+α. 
     Referring to  FIGS. 3 and 5 , the rotation connecting member  500  is connected to be vertically rotatable about the third rotation axis L 3  serving as a point of coupling between the rotation connecting member  500  and the sub operation member  300 . 
     Here, a distance between the foothold  520  and the third rotation axis L 3  refers to a, and a distance between the third rotation axis L 3  and the fourth rotation axis L 4  refers to b. When the user applies a vertically pressing force F to the foothold  520  of the rotation connecting member  500  while being seated in the seat portion  400 , a force F′ of vertically lifting up a rear portion of the rotation connecting member  500  is a/b*F based on the principle of the lever “a*F=b*F”, and a force F x  of actually rotating the rotation connecting member  500  is a/b*F*sin θ. 
     In short, when the user applies the vertically pressing force F to the foothold  520  formed on the front side of the rotation connecting member  500 , the rear portion of the rotation connecting member  500  is rotated by the force F x . 
     Thus, the rotation connecting member  500  is rotated in the direction in which the interior angle A of coupling between the rotation connecting member  500  and the main operation member  200  increases, and the main operation member  200  and the seat portion  400  are interlocked with each other according to the virtual quadrangle and are moved forward about the first rotation axis L 1  with respect to a virtual vertical line. 
     In the swing chair according to the present invention, the rotation connecting member  500  may be extended and contracted forward along the longitudinal direction thereof. That is, a length a between the third rotation axis L 3  and a front distal end of the rotation connecting member  500  may be small or large. 
     Further, the position of the third rotation axis L 3  at which the other end of the sub operation member  300  is coupled to the rotation connecting member  500  may be adjusted. That is, the length b may be formed to be small or large. 
     It is preferable that in the rotation connecting member  500  of the swing chair according to the present invention, the length a is large and the length b is small. 
     As discussed above, when the user applies the vertically pressing force F to the foothold  520  formed on the front side of the rotation connecting member  500 , the force F x  of rotating the rotation connecting member  500  is a/b*F*sin θ. Thus, as the length a becomes larger and the length b becomes smaller, the force F x  of rotating the rotation connecting member  500  becomes larger even if the force F is small. 
     Thus, as the length a of the rotation connecting member  500  is formed to be larger and the length b of the rotation connecting member  500  is formed to be smaller, even when the user applies a small force to the foothold  520 , the rotation connecting member  500  is rotated by a large force. As a result, the seat portion  400  in which the user is seated is easily moved forward. 
     As above, even when the user applies a small force to the foothold  520  using the principle of the lever, the seat portion  400  easily swing forward or rearward, so that the swing chair may be used for lower body exercise of the elderly person. 
     Referring to  FIGS. 2 and 6 , after the main operation member  200  and the seat portion  400  are moved forward, the main operation member  200  and the seat portion  400  are moved rearward in turn by the inertia while potential energy is converted into kinetic energy. 
     In this state, the rotation connecting member  500  is rotated in a direction in which the interior angle A of coupling between the rotation connecting member  500  and the main operation member  200  decreases. That is, the rotation connecting member  500  is rotated such that the interior angle A of coupling between the rotation connecting member  500  and the main operation member  200  is decreased to A−α, and the main operation member  200  and the seat portion  400  are interlocked with each other according to the virtual quadrangle and are moved rearward about the first rotation axis L 1  with respect to the virtual vertical line. 
     Thereafter, the main operation member  200  and the seat portion  400  returns to original positions thereof again by the inertia, as illustrated in  FIG. 5 . In this case, because an inertia force becomes weak, the main operation member  200  and the seat portion  400  are moved less than the state illustrated in  FIG. 5 . That is, the rotation connecting member  500  is rotated by an angle that is smaller than the interior angle (A+α) of coupling between the rotation connecting member  500  and the main operation member  200 . 
     Thus, at this time, when the user applies the pressing force F to the foothold  520  again, the force F x  of lifting up the rear portion of the rotation connecting member  500  about the third rotation axis L 3  increases, so that the rotation connecting member  500  is rotated by an angle that is larger than the state illustrated in  FIG. 5 . That is, the rotation connecting member  500  is rotated by an angle that is larger than the interior angle (A+α) of coupling between the rotation connecting member  500  and the main operation member  200 . As a result, the seat portion  400  is moved greatly forward. 
     Through this process, the main operation member  200  and the seat portion  400  of the swing chair according to the present invention swing forward or rearward. 
     In short, when the user is seated in the seat portion  400  and applies the force to the foothold  520  in a state in which the swing chair is stopped as illustrated in  FIG. 4 , the seat portion  400  is moved forward as illustrated in  FIG. 5 , and the seat portion  400  is then moved rearward by the inertia as illustrated in  FIG. 6 . When the seat portion  400  is moved less than the state illustrated in  FIG. 5  by the inertia, if the user applies the force to the foothold  520  again, the seat portion  400  continuously and greatly swings forward or rearward. 
     Because an inertial force increases after the main operation member  200  and the seat portion  400  swing, even when the user steps on the foothold  520  with a weak force in a state in which the seat portion  400  is moved forward, the seat portion  400  greatly swings. 
     As above, the swing chair according to the present invention easily swings even when a force is applied to the foothold  520  without a separate power source. 
     As in the present embodiment, when both the main operation member  200  and the sub operation member  300  installed on the front side of the main operation member  200  are formed in the shape of a wire, the seat portion  400  is installed not in the sub operation member  300  but in the main operation member  200 . 
     If the seat portion  400  is installed in the sub operation member  300 , when the user applies a force to the foothold  520  so that the rotation connecting member  500  is rotated about the third rotation axis L 3 , and thus the rear portion of the rotation connecting member  500  is lifted up, the main operation member  200  in the form of a wire is contracted and bent, and thus, the swing chair according to the present embodiment does not work. 
     Referring to  FIG. 7 , a handle  900  may be further provided in the seat portion  400  or the rotation connecting member  500 . 
     Thus, if the user is the child or the elderly person, when a guardian moves the handle  900  forward or rearward while gripping the handle  900 , even if a force is not applied to the foothold  520 , the seat portion  400  swings forward or rearward. 
     It is obvious that the shape of the handle  900  is not limited, and the handle  900  may be formed at various positions of the seat portion  400  or the rotation connecting member  500  in various forms. 
     It is preferable that a cradle  600  may be further provided in the seat portion  400 , and the cradle  600  is fixedly installed in the seat portion  400  through a separate coupling means such that a baby does not fall. 
     In this case, in a state in which the young baby is laid in the cradle  600 , the guardian may slowly swing the seat portion  400  while moving the handle  900  forward or rearward. Further, in a state in which the young baby is laid in the cradle  600 , when the guardian is seated in the seat portion  400  and steps on the foothold  520  to swing the seat portion  400 , the baby and the guardian may face each other, so that this is helpful in developing baby&#39;s emotion. 
     A separate operation handle (not illustrated) may be provided in the rotation connecting member  500  on the front side of the third rotation axis L 3  serving as a point of coupling between the rotation connecting member  500  and the sub operation member  300 . It is preferable that the operation handle may be replaced with the above-described handle  900 , and may be arranged at a position which the user may access while being seated in the seat portion  400 . 
     Thus, while being seated in the seat portion  400 , the user may grip the operation handle (not illustrated) with hands without stepping on the foothold  520  to move the operation handle forward or rearward, so as to swing the seat portion  400  forward/rearward. 
     Referring to  FIG. 8 , the seat portion  400  or the rotation connecting member  500  may further include a massage means  700 . 
     A vibration roller, a finger-pressure roller, or the like, which is electrically operated, may be used as the massage means  700 , or a finger-press plate having a plurality of protrusions may be also used as the massage means  700 . 
     In the embodiment, as illustrated in the drawing, a device having a massage function, such as the vibration roller and the finger-pressure roller which are electrically operated, may be embedded in the seat portion  400 , and a finger-pressure pad (not illustrated) having a plurality of protrusions may be installed on the upper surface of the seat portion  400 . 
     Further, as illustrated in the drawing, a finger-pressure plate  720  having a plurality of protrusions formed on the upper surface thereof may be installed instead of the foothold  520 , and the electrically-operated finger-pressure roller (not illustrated) may be also installed. 
     Thus, while using the swing chair according to the present embodiment, the user may obtain an effect of receiving a massage. 
     Although not illustrated in the drawing, a means which may measure physical information may be further provided in the seat portion  400 . 
     It is preferable that a means such as a small heart rate measuring device, a small body fat measuring device, a blood pressure measuring device for a watch, and a small calorie measuring device, which has a small volume and may simply measure the physical information, is used as the means which may measure the physical information. 
     Because the swing chair according to the present invention may easily swing even when the user steps on the foothold  520  with a weak force, when the elderly person uses the swing chair for the purpose of exercise, the elderly person may recognize a current health state using the physical information measuring means as well as may perform the exercise. 
     Hereinafter, configurations and operation schemes of the swing chair according to the second to sixth embodiments of the present invention will be described based on the fact that the sub operation member  300  is installed in the support  100  to be located on the front side of the main operation member  200 . 
     Further, contents on the above-described operation structure of the swing chair illustrated in  FIGS. 2 and 3  are commonly applied to the swing chair according to the second to sixth embodiments of the present invention, which will be described below. 
       FIGS. 9 to 10  are views illustrating the shape of the swing chair according to the second embodiment of the present invention. 
     The swing chair according to the second embodiment differs from the swing chair according to the first embodiment, which has been described in  FIGS. 1 and 4 to 6 , in that the main operation member  200  is formed in the shape of a rigid frame that is not bent. 
     As above, except for the configuration that the main operation member  200  is formed in the shape of a frame, configurations and an operation scheme of the swing chair according to the present embodiment are similar to the above-described configurations and the above-described operation scheme of the swing chair illustrated in  FIGS. 2 to 6  according to the first embodiment. 
     Thus, when the user applies a force to the foothold  520 , the seat portion  400  swings forward or rearward while the rotation connecting member  500  is rotated. 
     In the swing chair (not illustrated) according to the third embodiment, in  FIGS. 9 and 10 , the seat portion  400  is fixed and coupled to the spaced sub operation members  300  having the form of a wire through a separate coupling means. 
     In this way, when the seat portion  400  is fixed and coupled to the sub operation member  300  having the form of a wire through the separate coupling means, the user applies a force to the foothold  520  so that the rotation connecting member  500  is rotated about the third rotation axis L 3 . Thus, the main operation member  200  having the form of a frame is not bent even when the rear portion of the rotation connecting member  500  is lifted up, so that the swing chair according to the present embodiment swings forward/rearward. 
     The swing chair (not illustrated) according to the fourth embodiment differs from the swing chair illustrated in  FIGS. 1 and 4 to 6  according to the first embodiment in that the sub operation member  300  is formed in the form of a frame. 
     Thus, even in the present embodiment, when the user steps on the foothold  520 , the seat portion  400  swings forward and rearward, as illustrated in  FIGS. 4 to 6 . 
     In the above case, the seat portion  400  should be fixed and coupled not to the sub operation member  300  located on the front side and having the shape of a frame but to the main operation member  200  located on the rear side and having the shape of a frame. 
     If the seat portion  400  is coupled to the sub operation member  300 , when the user applies a force to the foothold  520  to lift up the rear portion of the rotation connecting member  500 , the main operation member  200  having the shape of a wire is bent and curved, and thus, the swing chair is not operated. 
       FIGS. 11 to 12  illustrate the shape of the swing chair according to the fifth embodiment and the sixth embodiment of the present invention. 
     The swing chair according to the present embodiment is formed in the shape of a rigid frame in which neither the main operation member  200  nor the sub operation member  300  are bent. 
     An upper portion of the main operation member  200  and an upper portion of the sub operation member  300  are rotatably coupled to each other through a connection means such as a bracket  90  installed in the support  100  to have the first rotation axis L 1  and the second rotation axis L 2 , respectively. 
     Further, it is preferable that the first rotation axis L 1  and the second rotation axis L 2  are spaced apart from each other in a front-rear direction such that the upper portion of the main operation member  200  and the upper portion of the sub operation member  300  do not interfere with each other. 
     The rotation connecting member  500  rotatably coupled to the third rotation axis L 3  and the fourth rotation axis L 4  may include an inner plate  550  and an outer plate  560 . 
     In the swing chair according to the fifth embodiment, the seat portion  400  is fixedly coupled to the main operation member  200 , and in the swing chair according to the sixth embodiment, the seat portion  400  is fixedly coupled to the sub operation member  300 . 
     Thus, even in the case of the swing chair according to the fifth embodiment and the sixth embodiment, when the user applies a force to the foothold  520 , the seat portion  400  swings forward or rearward while the rotation connecting member  500  is rotated. 
     Hereinabove, the exemplary embodiments of the present invention have described above. It is obvious to those skilled in the corresponding art that the present invention may be specified in different specific forms in addition to the above-described embodiments without departing from the purpose and the scope of the present invention. Therefore, the above-described embodiments are considered to be not restrictive but illustrative, and accordingly, the present invention is not limited to the above descriptions and may be changed within the scope and equivalents of the appended claims.