JP2007283781A - Child seat forming member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a child seat forming member capable of realizing an optimal structure in using it as a baby carriage and a carrier. <P>SOLUTION: This child seat forming member 100 is mounted on a dolly free to connect and disconnect and is furnished with a seat body 110 and a reverse U letter shape bar member 120. The seat body 110 can be changed over to a chair type form and a bed type form. The reverse U letter shape bar member 120 has a pair of vertical bar parts 121 lower end parts of which are supported on both side parts of the seat body 110 and extending in parallel and a cross bar part 122 extending in the cross direction so as to connect head ends of a pair of the vertical bar parts 121 to each other. The reverse U letter shape bar member 120 functions as a front guard for safety positioned in front of a seat space in a state mounting the seat body 110 in the chair type form on the dolly and functions as a handle to carry the seat body by extending in the vertical direction in a state removing the seat body 110 from the dolly. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a child seat forming member that is detachably attached to a transport vehicle body.

Japanese Laid-Open Patent Publication No. 2002-205586 discloses a child seat that can be mounted on a car seat by using a seat belt provided in the car, and can also be used as a baby carriage seat, a carry, and a chair. ing.
Japanese Patent Laid-Open No. 2002-205586

  When a child seat forming member is mounted on a carriage and used as a baby carriage, it is necessary to provide a structure with excellent safety required for a baby carriage. In addition, when the child seat forming member is used as a carry, it must be easy to carry.

  An object of the present invention is to provide a child seat forming member that can provide an optimal structure when used as a baby carriage and a carry.

  The present invention is a child seat forming member that is detachably mounted on a transport vehicle, and includes a seat body and an inverted U-shaped bar member. The seat body can be switched between a chair-like form and a bed-like form. The inverted U-shaped bar member has a lower end portion that is supported on both sides of the seat body so as to be capable of changing the angular position and is connected in parallel to a pair of vertical bar portions that extend in parallel with the tip ends of the pair of vertical bar portions. And a horizontal bar portion extending in the width direction. The inverted U-shaped bar member functions as a safety front guard located in front of the seat space when the seat body is mounted in the form of a chair on the carriage, and the seat body is removed from the carriage. Then, it extends in the vertical direction and functions as a handle for carrying the seat body.

  According to the present invention configured as described above, an optimal structure can be provided when used as a baby carriage and a carry.

  Preferably, the vertical bar portion of the inverted U-shaped bar member is provided so that the length can be adjusted. More preferably, the vertical bar portion of the inverted U-shaped bar member is rotatably connected to both side portions of the seat body.

  In a preferred embodiment, the inverted U-shaped bar member is positioned on the back of the seat body so that the horizontal bar abuts against the floor surface when the seat body is removed from the carriage and placed on the floor surface. It functions as a tension frame that prevents the body from falling backward.

  The child seat forming member according to one embodiment of the present invention can be used in the following manner.

  (A) It is used by being mounted on a car seat using a seat belt provided in the car.

  (B) Attached to the seat carrier body and used as a baby carriage.

  (C) To be used as a carry that can hold and carry a child.

  (D) Being placed indoors and used as an indoor chair or bed.

  FIGS. 1-6 has shown the seat conveyance vehicle body for carrying and carrying a child seat formation member. With reference to these drawings, the structure of the seat carrier body will be described first.

  The seat-carrying vehicle body includes a front leg 10 having a front wheel 11, a rear leg 20 having a rear wheel 21, a push bar 30 that is gripped when the vehicle body is moved, and the front leg 10, the rear leg 20, and the push bar 30 in an open state and a folded state. And a positional relationship fixing means 60 for fixing the positional relationship.

  The upper end portion of the front leg 10 and the upper end portion of the rear leg 20 are connected to each other via the first shaft 1 so as to be rotatable. The push rod 30 has a front end member 32 at the front end thereof, and the front end member 32 is connected to the front leg 10 so that it can be displaced along the front leg 10 during the folding operation. Specifically, as shown in FIG. 2, the front end member 32 has a receiving hole 33 penetrating in the vertical direction, and the front leg 10 can be relatively slid in the vertical direction in the receiving hole 33. ing.

  A portion in the middle of the push rod 30 is rotatably connected to the rear leg 20 via the second shaft 2. A more specific structure will be described. As shown in FIG. 2, the rear leg 20 has an upper plate 22 at an upper end thereof. The push rod 30 has an intermediate plate 31 at a midway position thereof. The upper plate 22 of the rear leg 20 and the intermediate plate 31 of the push rod 30 are connected via the second shaft 2 so as to be rotatable.

  The positional relationship fixing means 60 in the illustrated embodiment fixes the crossing angle between the push rod 30 and the rear leg 20 in the open state and the folded state of the seat carrier body. As another embodiment, the positional relationship fixing means may fix the crossing angle between the front leg and the rear leg, or may fix the crossing angle between the front leg and the push bar. In short, the positional relationship fixing means only needs to fix a triangle formed by the connection point between the front end member 32 of the push rod 30 and the front leg 10, the first shaft 1, and the second shaft 2. Details of the positional relationship fixing means 60 will be described later.

  The push rod 30 has an inverted U-shaped grip portion 34 that is rotatably provided via a connecting shaft 35 at an upper portion thereof. In the open state of the seat carrier body shown in FIG. 1, the grip portion 34 extends so as to extend the push rod 30 upward. On the other hand, in the folded state shown in FIG. 11, the grip portion 34 is bent along the lower part of the push rod 30, thereby reducing the height of the folded state of the seat carrier body.

  Next, the positional relationship fixing means 60 will be described with reference to FIGS. In FIGS. 5 and 6, each element related to the positional relationship fixing means 60 is illustrated schematically, and it should be understood that it is different from the actual shape.

  The illustrated positional relationship fixing means 60 fixes the crossing angle between the push rod 30 and the rear leg 20. As a specific structure, the positional relationship fixing means 60 includes a lock member 61 provided so as to be displaceable in the vertical direction along the push rod 30. A plurality of locking portions 62 and 63 are provided on the upper plate 22 of the rear leg 20 so as to be locked to the lock member 61. As shown in FIG. 5, in a state where the lock member 61 is engaged with one of the locking portions 62, the connection point between the push rod 30 and the front leg 10, the first shaft 1, the second shaft 2, The triangle formed by is fixed, and the open state of the seat carrier body is fixed.

  As shown in FIG. 6, in a state where the lock member 61 is engaged with the other locking portion 63, the triangle in the folded state is fixed, and the folded state of the seat carrier body is fixed.

  FIG. 4 shows operating means for moving the lock member 61. As shown in FIG. 4, a mounting member 36 having a cavity below is fixed to the center of the inverted U-shaped grip 34 positioned above the push bar 30. The attachment member 36 has an attachment hole 43 that receives the fixed shaft 42.

  The operation member 37 incorporated in the hollow portion of the attachment member 36 has a long hole 44 that receives the fixed shaft 42. Since the long hole 44 is long in the vertical direction, the operation member 37 can be displaced in the vertical direction.

  Two rotating members 38 and 39 having three apexes are rotatably attached to the fixed shaft 42. Of the three vertices of the rotating members 38 and 39, the first vertex is connected to the fixed shaft 42, the second vertex is in contact with the operation member 37, and the third vertex is connected to the wires 40 and 41. Yes. The wires 40 and 41 extend along a pair of push rods 30 positioned on the left and right side portions of the seat transporting vehicle body, and the lower ends thereof are connected to a lock member 61 that is a component of the positional relationship fixing means 60. Although not shown, the pair of lock members 61 positioned on the left and right sides are urged so as to always move downward by a spring. Therefore, an urging force to rotate counterclockwise in the drawing acts on one rotating member 38 via the wires 40 and 41, and the other rotating member 39 rotates clockwise in the drawing. The urging force to be moved is acting. Therefore, the operation member 37 is normally brought to a lower position.

  For example, when an attempt is made to fold a seat-carrying vehicle body in an open state, the operation member 37 is grasped by hand and brought to an upper position. Then, the lock member 61 is pulled upward by the wires 40 and 41 and moves upward, and is separated from the one locking portion 62. In this state, the crossing angle between the rear leg 20 and the push rod 30 can be changed, so that the seat carrier body is folded so that the front wheel 11 and the rear wheel 21 are brought closer to each other. During this folding operation, the front leg 10 slides within the receiving hole 33 of the front end member 32 of the push rod 30 by a predetermined amount.

  When the seat carrier body is in a predetermined folded state, the hand holding the operation member 37 is released. Then, the lock member 61 moves downward by the urging force of the spring, and engages with the other locking portion 63 to fix the folded state of the seat carrier body.

  As shown in FIGS. 1 and 7, the seat carrier body includes a seat support member 45 that supports the seat 111 of the seat body 110 of the seat forming member 100 from below. The seat support member 45 is fixed to the push rod 30 via fixed shafts 46 and 47. The seat body 110 is detachably mounted on the seat support member 45. The seat body 110 can be mounted on the seat support member 45 in both the forward and backward directions. Furthermore, as shown in FIG. 11, it is possible to fold the seat carrying vehicle body with the seat body 110 attached to the seat support member 45.

  7 to 11 show a state in which the child seat forming member 100 is used as a baby carriage mounted on the seat carrier body. The seat forming member 100 is provided so as to be detachable with respect to the transporting vehicle body, and can be attached in both forward and backward states. 7 and 8 show a state in which the seat forming member 100 is attached forward, and the mother or the like moves and operates the vehicle body in a state of pushing the back against the child seated on the seat. FIGS. 9 and 10 show a state in which the seat forming member 100 is attached rearward, and the mother or the like moves and operates the vehicle body in a face-to-face state with respect to the child seated on the seat.

  FIG. 11 shows a state in which the seat carrier body is folded. As shown in the drawing, in the folded state, the front wheel 11 and the rear wheel 21 approach each other, and the seat-carrying vehicle body can stand on its own. In addition, the seat carrier body can be folded while the seat forming member 100 is attached. As is clear from a comparison between FIGS. 7 and 11, the basic form of the seat forming member 100 is not changed in the open state and the folded state of the seat carrier body. That is, the seat main body 110 of the seat forming member 100 includes the seat portion 111 and the backrest portion 112, but the angle between the seat portion 111 and the backrest portion 112 is determined in the open state and the folded state of the seat transport vehicle body. The same.

  The seat forming member 100 includes a seat main body 110 including a seat portion 111 and a backrest portion 112, and an inverted U-shaped bar member 120 supported on both side portions of the seat main body 110 so that the angular position can be changed. Since the backrest part 112 is provided so as to be able to tilt backward with respect to the seat part 111, the seat main body 110 can be switched between a chair-like form and a bed-like form.

  The inverted U-shaped bar member 120 has a pair of vertical bar parts 121 and a pair of vertical bar parts whose lower end portions are supported on both side parts of the backrest part 112 of the seat body 100 so that the angular position can be changed and extend in parallel. It has an inverted U shape having a horizontal bar portion 122 extending in the width direction so as to connect the front ends of 121.

  The crossing angle between the horizontal bar portion 122 and the vertical bar portion 121 of the inverted U-shaped bar member 120 is preferably approximately 90 degrees. Further, the vertical bar portion 121 of the inverted U-shaped bar member 120 is rotatably connected to both side portions of the backrest portion 112. Furthermore, the vertical bar 121 of the inverted U-shaped bar member 120 is provided so that the length can be adjusted. In order to make the length of the vertical bar 121 adjustable, in the illustrated embodiment, the vertical bar 121 is a cylindrical outer cylinder 121a that is rotatably connected to the backrest 112 of the seat body 110, and The outer cylinder part 121a includes an insertion part 121b that is slidably received.

  The form of FIGS. 7-11 currently mounted on the conveyance vehicle body and used as a baby carriage will be described in more detail.

  FIG. 7 shows a state where the seat body 110 of the seat forming member 100 is mounted on the transport vehicle body in a forward-facing state. Since the backrest 112 of the seat main body 100 is raised, the seat main body 100 has a chair shape. The inverted U-shaped bar member 120 is located in front of the seat space and functions as a front guard for safety. The length of the vertical bar 121 is adjusted so that the horizontal bar 122 of the inverted U-shaped bar member 120 is in an optimal position to function as a front guard. In the illustrated embodiment, the length of the vertical bar 121 is relatively short.

  In FIG. 8, the seat main body 110 of the seat forming member 100 is directed forward, and the backrest 112 is tilted rearward to form a bed shape. In this state, since the member functioning as the front guard is not necessary, the inverted U-shaped bar member 120 is brought to the front lower position. In order to bring it to this lower position, the length of the vertical bar 121 of the inverted U-shaped bar member 120 is relatively long.

  In FIG. 9, the seat body 110 of the seat forming member 100 is directed backward, and the backrest 112 is raised to form a chair shape. In this state, a member that functions as a front guard is required to ensure safety, so the inverted U-shaped bar member 120 is positioned in front of the seat space. Moreover, the length of the vertical bar 121 of the inverted U-shaped bar member 120 is relatively short.

  In FIG. 10, the seat main body 110 of the seat forming member 100 is directed rearward, and the backrest 112 is tilted rearward to form a bed shape. In this state, since a member functioning as a front guard is not necessary, the inverted U-shaped bar member 120 is brought to a lower position in front of the seat portion 111.

  In FIG. 11, the seat-carrying vehicle body is folded while the seat body 110 of the seat forming member 100 faces forward and the backrest portion 112 is raised to be in the form of a chair. In order to reduce the length in the front-rear direction in the folded state, the inverted U-shaped bar member 120 is relatively long and brought to a lower position in front of the seat.

  FIG. 12 shows a seat forming member 100 used as a carry. In this state, the seat forming member 100 is removed from the seat carrier body, and the inverted U-shaped bar member 120 is brought to an upright position suitable as a handle. Further, the backrest 112 is tilted backward to make the seat main body 110 into a bed shape.

  FIG. 13 shows a seat forming member 100 used as an indoor chair. In this state, the length of the inverted U-shaped bar member 120 is relatively long, and the horizontal bar portion 122 is positioned behind the backrest portion 112 so as to come into contact with the floor surface. When the horizontal bar portion 122 of the inverted U-shaped bar member 120 contacts the floor surface behind the backrest portion 112, the inverted U-shaped bar member 120 functions as a tension frame that prevents the seat body 110 from falling backward. To do. In the state shown in FIG. 13, the backrest portion 112 is raised to form a chair, but the backrest portion can be tilted back to form a bed.

  14 to 17 show a state in which the seat forming member 100 is mounted and used on a seat of the automobile using a seat belt provided in the automobile. FIGS. 14 and 15 show a state in which the seat forming member 100 is attached backward in the form of a chair, and FIGS. 16 and 17 show a state in which the seat forming member 100 is attached sideways in the form of a bed. Show.

  As shown in FIGS. 14 and 15, in a state where the seat forming member 100 is attached to the back of the car in the form of a chair, the horizontal bar portion 122 of the inverted U-shaped bar member 120 is attached to the car seat. The length and angle of the vertical bar 121 are adjusted so as to stably contact the backrest. Thus, the rebound operation | movement of the seat main body 100 at the time of a vehicle collision is suppressed by making the horizontal bar part 122 of the inverted U-shaped bar member 120 contact | abut to the backrest part of a vehicle seat.

  As shown in FIGS. 16 and 17, in the state where the seat forming member 100 is mounted horizontally on the vehicle seat in the form of a bed, the vertical bar 121 of the inverted U-shaped bar 120 is attached to the vehicle seat. Rebound movement at the time of a collision is suppressed by making it contact stably with a backrest part. In order to realize this operation, it is preferable that the crossing angle between the horizontal bar portion 122 and the vertical bar portion 121 of the inverted U-shaped bar member 120 is approximately 90 degrees. Since the pair of vertical bar portions 121 extend in parallel, even if the bed-shaped seat main body 110 is inverted 180 degrees from the state shown in FIG. 16, the other vertical bar portion 121 remains on the car seat. Stable contact with the backrest.

  The vertical bar portion 121 of the inverted U-shaped bar member 120 is rotatably connected to the outer surface portion of the backrest portion 112 of the seat body 100 and can be fixed at a predetermined angular position. As a structure for fixing the vertical bar 121 at a predetermined angle, various structures are conceivable. One example thereof will be described with reference to FIG.

  FIG. 18 is an illustrative view showing an example of a structure in which the outer cylindrical portion 121a of the inverted U-shaped bar member 120 is supported on the fixing member 130 on the backrest portion 112 of the seat body 110 so that the angle can be changed. The outer cylinder portion 121a is rotatably supported on the fixed member 130 via the shaft 137. A plurality of engagement grooves 136a, 136b, and 136c are formed in the fixing member 130 along a circumference centered on the shaft 137.

  A lock member 131 that is always urged downward by a spring 135 is accommodated in the outer cylinder portion 121a. The lock member 131 is engaged with the operation portion 132 exposed on the outer cylinder portion 121a, the long hole 133 through which the shaft 137 is passed, and the engagement grooves 136a, 136b, and 136c. And a convex portion 134.

  In the state shown in FIG. 18, the lock member 131 is brought to the upper position by lifting the operation portion 132 upward by hand. In this state, since the engaging convex portion 134 of the lock member 131 is disengaged from the engaging grooves 136a, 136b, and 136c, the outer cylinder portion 121a can be rotated with respect to the fixing member 130.

  When trying to fix the outer cylinder part 121a at a desired angular position, the hand is released from the operation part 132. Then, the lock member 131 is pushed by the spring 135 and moves downward (in the direction toward the shaft 137), and the engagement convex portion 134 engages with one of the engagement grooves 136a, 136b, and 136c, and the outer cylinder portion. The angular position of 121a is fixed.

  As a structure for enabling the length adjustment of the vertical bar 121 of the inverted U-shaped bar member 120, various structures are conceivable. One example thereof will be described with reference to FIG.

  FIG. 19 shows an example of a structure for adjusting the length of the vertical bar 121 of the inverted U-shaped bar member 120. The vertical bar 121 has an outer cylinder 121a and an insertion part 121b whose base is slidably received in the outer cylinder 121a.

  The outer cylinder part 121a has an upper lock hole 140 and a lower lock hole 141 that are formed at intervals in the vertical direction. A leaf spring 151 is attached to the insertion portion 121b via a fixed shaft 150. A lock pin 152 that is selectively fitted into the lock holes 140 and 141 is attached to the tip of the leaf spring 151. Furthermore, an operating member 154 connected via a connecting shaft 155 is accommodated in the insertion portion 121b so as to be displaceable. The insertion portion 121b has a long hole 156 that extends long in the vertical direction, and the connecting shaft 155 extends through the long hole 156. Therefore, the operation member 154 can be displaced in the vertical direction within a range in which the connecting shaft 155 can move up and down in the long hole 156. The spring 157 supported by the fixed spring receiver 153 fixed in the insertion portion 121b always urges the operation member 154 upward.

  The lower end of the operation member 154 is in contact with the leaf spring 151. In the state shown in FIG. 19A, the position of the insertion portion 121 b is fixed by fitting the lock pin 152 into the lower lock hole 141. In the state shown in FIG. 19A, the vertical bar 121 of the inverted U-shaped bar member 120 has a relatively short length.

  In the state shown in FIG. 19 (b), the operating member 154 is operated by hand and moved downward. In this state, the lower end of the operation member 154 deflects the leaf spring 154 inward, and as a result, the lock pin 152 is detached from the lower lock hole 141. Therefore, it is possible to slide the insertion portion 121b upward.

  In the state shown in FIG. 19C, the insertion portion 121b slides to the upper position, and as a result, the vertical bar portion 121 has a relatively long length. In this state, the operation member 154 returns to the original position by the urging force of the spring 157, and the lock pin 152 located at the tip of the leaf spring 151 is fitted into the upper lock hole 140 to fix the position of the insertion portion 121b. ing.

  The angular position fixing mechanism shown in FIG. 18 and the length adjusting mechanism shown in FIG. 19 are merely examples, and it goes without saying that various modifications and changes are possible.

  The embodiment described with reference to FIGS. 1 to 19 is a seat forming member that can be used as an automobile child seat, a stroller, a carry, and an indoor chair. However, as another embodiment of the present invention, a stroller is used. It may also be a child seat forming member that can only be used as a carry.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The present invention can be advantageously used as a child seat forming member that can provide an optimal structure when used as a baby carriage and a carry.

It is a side view of the seat conveyance vehicle body which is one Embodiment of this invention. It is a side view which decomposes | disassembles and shows the front leg, rear leg, and push bar of a seat conveyance vehicle body. It is a side view of the state which connected the back leg and the push rod. It is a figure which shows the operation means for moving a lock member. It is an illustration figure of the positional relationship fixing means which is fixing the seat conveyance vehicle body in an open state. It is an illustration figure of the positional relationship fixing means which is fixing the seat conveyance vehicle body in the folding state. It is a side view which shows the state attached to the seat conveyance vehicle body with the seat main body of the chair shape facing forward. It is a side view which shows the state attached to the seat conveyance vehicle body with the seat body of a bed-like form facing forward. It is a side view which shows the state attached to the seat conveyance vehicle body with the seat main body of the chair shape facing back. It is a side view which shows the state attached to the seat conveyance vehicle body with the seat body of a bed-like form facing back. It is a side view which shows the state which folded the seat conveyance vehicle body, with the seat main body of a bed shape facing forward, and attaching on a seat conveyance vehicle body. It is a side view which shows the state which uses the seat formation member as a carry. It is a side view which shows the state which uses the seat formation member as an indoor chair. It is a perspective view which shows the state which has mounted the seat main body of the chair shape back on the seat of a car. It is a side view which shows the state which has mounted the seat main body of the chair shape back on the seat of a car. It is a perspective view which shows the state attached to the seat body of a bed-like form on the seat of a car sideways. It is a side view which shows the state which has mounted the seat main body of the bed shape sideways on the seat of a car. It is a figure which shows an example of the structure for fixing the angle position of the vertical bar part of an inverted U-shaped bar member. It is a figure which shows an example of the structure for adjusting the length of the vertical bar part of an inverted U-shaped bar member, (a) is the state in which the lock pin is engaging with the downward lock hole, (b) is a lock A state in which the pin is disengaged from the lower lock hole, (c) shows a state in which the lock pin is engaged with the upper lock hole.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 1st axis | shaft, 2nd axis | shaft, 10 front leg, 11 front wheel, 20 rear leg, 21 rear wheel, 22 upper plate, 30 push rod, 31 intermediate plate, 32 front end member, 33 receiving hole, 34 grip part, 35 Connecting shaft, 36 Mounting member, 37 Operating member, 38, 39 Rotating member, 40, 41 Wire, 42 Fixed shaft, 43 Mounting hole, 44 Long hole, 45 Seat support member, 46, 47 Fixed shaft, 60 Positional relationship Fixing means, 61 Lock member, 62, 63 Locking part, 100 Child seat forming member, 110 Seat body, 111 Seat part, 112 Backrest part, 120 Inverted U-shaped bar member, 121 Vertical bar part, 121a Outer cylinder part, 121b Insertion part, 122 Horizontal bar part, 130 Fixing member, 131 Lock member, 132 Operation part, 133 Long hole, 134 Engaging convex part, 135 Spring, 136a, 136b 136c engaging groove, 137 shaft, 140 the upper locking hole 141 below the locking hole, 150 fixed shaft, 151 leaf spring 152 locking pin 153 receives fixing spring 154 operating member 155 connecting shaft 156 slots, 157 springs.

Claims (4)

A child seat forming member that is detachably mounted on a transport vehicle,
A seat body switchable between a chair-like form and a bed-like form;
A pair of vertical bar portions whose lower end portions are supported on both side portions of the seat body so as to be capable of changing the angular position and extend in parallel, and a horizontal bar extending in the width direction so as to connect the ends of the pair of vertical bar portions An inverted U-shaped bar member having a portion,
The inverted U-shaped bar member functions as a safety front guard located in front of a seat space when the seat body is mounted in a chair shape on the transport vehicle, and the seat body is transported. A child seat forming member that functions as a handle that extends in the vertical direction and carries the seat body when removed from the vehicle. The child seat forming member according to claim 1, wherein the vertical bar portion of the inverted U-shaped bar member is provided so as to be adjustable in length. The child seat forming member according to claim 1 or 2, wherein the vertical bar portion of the inverted U-shaped bar member is rotatably connected to both side portions of the seat body. In the state where the seat body is removed from the transport vehicle and placed on the floor surface, the inverted U-shaped bar member is positioned on the back of the seat body and the horizontal bar portion is in contact with the floor surface. The child seat forming member according to any one of claims 1 to 3, wherein the child seat forming member functions as a tension frame that prevents the body from falling down.

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