JP4074501B2 - child seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a child seat in which a seat body can be turned to change the direction of the vehicle in the front-rear direction.
[0002]
[Prior art]
As a child seat of this type, a seat including a base fixed to a vehicle seat via a seat belt and a seat body connected to the base via a seat turning mechanism and a reclining mechanism is known (for example, Patent Document 1). The base is sometimes called a pedestal, cradle, base, etc. In any case, the conventional base fixes the child seat to the seat, and the base on which the seat body turning mechanism and reclining mechanism fixed side parts are attached. It is only used as a part. There is no conventional example in which the base itself includes a movable part for giving the seat body a turning motion.
[0003]
Also, as a means for fixing the base to the vehicle seat, the vehicle seat belt is sandwiched between a pair of cam-like members with a surface irregularity, and the seat belt is allowed to pass in the tightening direction. 2. Description of the Related Art A belt fixing device that fixes a seat belt and a base to each other by regulating the operation of a cam-like member so as to prevent the passage of the seat belt in the direction (relaxation direction) is known (for example, Patent Document 2) reference).
[0004]
[Patent Document 1]
JP-A-10-1000076 [Patent Document 2]
Japanese Patent Laid-Open No. 2002-120617
[Problems to be solved by the invention]
When a seat turning mechanism and a reclining mechanism are provided between the base and the seat body, it is necessary to install both mechanisms in a limited space so that they do not interfere with each other. The structure of the connecting part of the above becomes complicated.
[0006]
In view of the above, an object of the present invention is to provide a child seat in which the seat body can be swiveled from a configuration different from the conventional one and the configuration of the connecting portion between the seat body and the base can be simplified.
[0007]
[Means for Solving the Problems]
Hereinafter, the child seat of the present invention will be described. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.
[0008]
The child seat (1) according to the present invention is a child seat including a base (2) and a seat body (3) supported by the base. The base is placed on a seat (100) of a vehicle. A base portion (10) and an upper base portion (20) which is pivotally attached to the lower base portion so that the direction of the vehicle in the front-rear direction can be reversed, and the seat body is attached to the upper surface (22). The seat body is attached to the upper base portion via a reclining mechanism (30), the shell (4) of the seat body is connected to the upper base portion via the reclining mechanism, and the shell The left and right side wall portions (4c) are provided with belt through holes (4e) through which a vehicle seat belt is passed, so that shell shells with respect to the upper base portion can be provided. The bridge (50) is disposed so as to straddle the shell in the left-right direction while allowing the inning operation, and both ends (51) pass through the belt through hole and are fixed to the side wall (25) of the upper base portion. A belt fixing device (40) for fixing a seat belt (111, 112) of the vehicle to the base is attached to the bridge, and the above-described problem is solved.
[0009]
According to this child seat, since the base itself has a turning function, there is no need to provide a seat turning mechanism between the base and the seat body, and the configuration of the connecting portion between them can be simplified. For example, when the seat body is reclined with respect to the base, it is only necessary to provide a reclining mechanism between the base and the seat body, and the design restrictions of the reclining mechanism are reduced. In addition, the same effect can be obtained when a mechanism for giving some operation to the seat body is provided for the base. In addition, the lower base part and the upper base part can be brought into contact with each other in a wide range without being affected by the connection part between the base and the seat body, so that the seat body can be swiveled, A sufficient support area between the fixed side and the movable side of the turning motion can be ensured to improve the stability of the turning portion.
[0010]
Since fixed on the base portion at vehicles of the seat belt, it is possible to suppress the transmission of shock to the pivot mechanism between the lower base part and the upper base portion. When the belt fixing device restrains the seat belt in only one direction, the belt fixing device can be turned upside down on the bridge to cope with changes in the belt tightening direction with a single belt fixing device. I can do it .
[0011]
The turning center line (Q) of the upper base portion with respect to the lower base portion is shifted toward the front side in the front-rear direction toward the upper side of the turning center line with respect to the direction orthogonal to the lower surface (14) of the lower base portion. You may be inclined to When the turning center line is tilted in this way, the degree of tilting of the back of the seat body when the seat body is mounted in a rearward posture is greater than when the turning center line is orthogonal to the bottom surface of the base. Can do. Further, the lower base portion may be formed in a shape in which the thickness gradually increases from the front end (11) in the front-rear direction toward the rear end (12). By giving such a shape to the lower base portion, it is possible to cancel the upward slope of the seating surface of the vehicle by the lower base portion and to tilt the turning center line of the upper base portion forward.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a child seat according to an embodiment of the present invention. The child seat 1 includes a base 2 and a seat body 3 supported by the base 2. The seat body 3 includes a hard resin shell 4 in which a seat portion 4a, a back portion 4b, and side wall portions 4c and 4c are integrally formed. Various accessories such as a belt harness, a belt adjustment mechanism, and a skin material are attached to the shell 4, but the illustration of the accessories is omitted.
[0013]
As shown in FIGS. 2 to 4, the base 2 includes a lower base portion 10 and an upper base portion 20. Each of the base portions 10 and 20 is a resin molded product. As shown well in FIG. 4, the lower base portion 10 is formed in a wedge shape whose thickness increases from the front end 11 toward the rear end 12. Concave portions 13a and 14a are formed in the centers of the upper and lower surfaces 13 and 14 of the lower base portion 10, respectively. The recess 13a on the upper surface 13 side is recessed in a substantially circular shape, and a boss 21a provided on the lower surface 21 of the upper base portion 20 is fitted therein.
[0014]
A concave portion 22a is formed on the upper surface 22 of the upper base portion 20 corresponding to the boss 21a. A connecting bolt 15 is attached to the concave portion 14a of the lower base portion 10, and the connecting bolt 15 passes through the base portions 10 and 20 and is screwed into a nut 23 in the concave portion 22a. Thereby, the upper and lower base parts 10 and 20 are connected so as to be rotatable about the connecting bolt 15. Accordingly, as shown in FIGS. 5A to 5C, the upper base portion 20 is turned with respect to the lower base portion 10 so that the direction of the upper base portion 20 is set in the front-rear direction of the vehicle (the left-right direction in FIG. 4). Can be reversed.
[0015]
In order to restrain the upper base portion 20 appropriately at the positions shown in FIGS. 5A and 5C, the upper base portion 20 is interposed between the upper surface 13 of the lower base portion 10 and the lower surface 21 of the upper base portion 20 as shown in FIG. ) And (c) may be provided with positioning means such as bosses and recesses that are respectively fitted. When such positioning means is provided, an appropriate margin is provided between the connecting bolt 15 and the nut 23, and the upper base part 20 can be lifted with respect to the lower base part 10 to release the fitting of the positioning means. It is desirable to do. Further, it is desirable that a coil spring or the like is mounted in a compressed state between the connection bolt 15 and the bottom surface of the recess 14 a to restrict play of the connection bolt 15 due to a margin between the connection bolt 15 and the nut 23.
[0016]
As is clear from FIGS. 4 and 5A to 5C, the upper surface 22 of the upper base portion 20 extends in the front-rear direction while drawing an arc that swells downward. A pair of left and right protrusions 24, 24 are formed at the center of the upper surface 22 in the left-right direction. The center line (turning center line) Q of the connecting bolt 15 is inclined with respect to the vertical line V of the lower surface 14 of the lower base portion 10 so that the upper side thereof is shifted toward the front end 11 side of the lower base portion 10. The thickness from the lower surface 21 of the upper base portion 20 to the upper surface of the ridge portion 24 (hereinafter referred to as the basic thickness of the upper base portion 20) increases as the distance from the turning center line Q increases. The change in the basic thickness of the upper base portion 20 is substantially symmetric in the front-rear direction (left-right direction in FIG. 4) with respect to the turning center line Q, but may be asymmetric.
[0017]
A fixed side rail 31 of the reclining mechanism 30 shown in FIG. 3 is fixed to the ridge portion 24 of the upper base portion 20. The fixed rail 31 is curved along the ridge 24, and a movable rail 32 is attached to the upper side of the fixed rail 31 so as to be slidable along the longitudinal direction (curved direction). The movable rail 32 is constrained on the fixed rail 31 by appropriate clamping means, for example, a clamping mechanism using its own spring action. A lever 33 is attached to the movable rail 32. By lifting the tip of the lever 33, the restraint of the movable side rail 32 by the clamping means is released, and the movable side rail 32 can move along the fixed side rail 31. Further, as shown in FIG. 6, the movable rail 32 is fixed to the shell 4. Thereby, the shell 4 can be moved along the curve of the fixed rail 31 to recline the seat body 3.
[0018]
As shown in FIG. 6, the base 2 is in a state where the lower surface 14 of the lower base portion 10 is in close contact with the seat surface 101 of the vehicle seat 100 and the rear end 12 of the lower base portion 10 faces the seat back 102 side. Attached to the seat 100. Then, by turning the upper base portion 20 with respect to the lower base portion 10, the orientation of the seat body 3 is between the forward posture shown in FIG. 7A and the rearward posture shown in FIG. 7B. Can be reversed.
[0019]
As described above, the thickness of the lower base portion 10 increases toward the rear end 12, and the turning center line Q of the upper base portion 20 is inclined with respect to the direction orthogonal to the lower surface 14 of the lower base portion 10. Therefore, compared with the case where the turning center line Q is set parallel to the normal direction of the lower surface 14, the inclination of the back portion 4b from the vertical direction in the rearward posture (FIG. 7B) can be increased. That is, in general, the seating surface 101 of the vehicle has an upward slope from the rear end toward the front end. Therefore, if the turning center line Q is provided in parallel with the normal direction of the base lower surface 14, The back portion 4b is raised and adjusted more in the backward posture than in the posture. On the other hand, when the turning center line Q is tilted as described above, the back portion 4b in the rearward posture is greatly tilted in the horizontal direction. Furthermore, if the reclining mechanism 30 is used, the back part 4b can be pushed down more greatly as shown by an imaginary line in FIG.7 (b). Although depending on the angle of the seating surface 101, it is desirable that the turning center line Q is inclined so that the upper side of the turning center line Q is shifted forward than the lower side in the mounting state on the vehicle.
[0020]
Next, a configuration for fixing the child seat 1 to the seat 100 using a vehicle seat belt will be described. As shown in FIG. 1, a belt fixing device 40 is provided near the boundary between the seat 4 a and the back 4 b of the shell 4. However, the belt fixing device 40 is not fixed to the shell 4 but is supported by the upper base portion 20 via the bridge 50.
[0021]
FIG. 6 is a sectional view with the bridge 50 removed, and FIG. 8 is a perspective view corresponding thereto. As is apparent from these drawings, a concave portion 4d for attaching a bridge is formed in the vicinity of the boundary between the seat portion 4a and the back portion 4b of the shell 4, and a belt through hole 4e through which a seat belt is inserted into the side wall portion 4c. Is formed to communicate with the recess 4d. On the other hand, as well shown in FIGS. 3 and 4, notches 26 are formed in the side walls 25, 25 of the upper surface 22 of the upper base 20. As shown in FIGS. 6 and 7A, the positions of the notch portion 26 of the side wall portion 25 and the belt through hole 4 e coincide with each other when viewed from the left-right direction of the child seat 1.
[0022]
After the shell 4 and the upper base portion 20 are connected via the reclining mechanism 30, the bridge 50 is disposed in the recess 4d of the shell 4 as shown in FIG. Both end portions 51, 51 of the bridge 50 pass through the belt through hole 4 e and are fitted into the cutout portions 26 of the upper base portion 20, so that the bridge 50 straddles the shell 4 and the side wall portions 25, It is bridged between 25. Then, the bridge 50 and the upper base portion 20 are fixed to each other by a fixing means (not shown) so that both end portions 51 of the bridge 50 do not come out of the notch portion 26. Note that the length of the belt through hole 4 e in the front-rear direction is sufficiently wider than that of the bridge 50 in order to recline the shell 4 with respect to the upper base portion 20 without being obstructed by the bridge 50.
[0023]
9 to 11 show details of the belt fixing device 40. As shown in these drawings, the belt fixing device 40 includes a main body case 41, a clamper 43 provided at one end of the main body case 41 so as to be opened and closed via a hinge 42, and a hinge 44 at the other end of the main body case 41. And a lock 45 provided to be freely opened and closed. A flap 46 is provided inside the clamper 43. As shown in FIG. 12, the flap 46 is attached to the clamper 43 so as to be rotatable by a minute angle around the turning shaft 47. The direction of the turning shaft 47 coincides with the longitudinal direction of the clamper 43. Nipping portions 48, 48 with saw-toothed irregularities are provided on the tip of the flap 46 and the inner surface of the main body case 41, respectively.
[0024]
As shown in FIGS. 11 and 12, the shoulder belt 111 and the lap belt 112 constituting the vehicle seat belt are bundled and passed between the main body case 41 and the clamper 43, and the clamper 43 is lowered in this state. 9, the belts 111 and 112 are sandwiched between the clamping portions 48 by closing the lock 45. When the shoulder belt 111 is pulled up in the direction of tightening (arrow F direction), the flap 46 rotates in the direction of arrow A in FIG. 12, and the gap between the clamping portions 48 is slightly widened to allow the belts 111 and 112 to move. However, when the shoulder belt 111 tries to move in the loosening direction (arrow R direction), the flap 46 moves in a direction that narrows the interval between the clamping portions 48, and the belts 111 and 112 are sandwiched between the clamping portions 48 and the belt 111. Is prevented. Thus, the belt fixing device 40 can restrain the belts 111 and 112 only in one direction. It should be noted that the hinge 44 that connects the lock 45 to the main body case 41 is restrained with an appropriate force at a closed position as shown in FIG. 9 to prevent the clamper 43 from being opened due to the tension on the belts 111 and 112. An opening prevention means is incorporated. Such an opening prevention means can be configured using a cam, for example.
[0025]
As shown in FIG. 11, a mounting hole 49a is formed at the longitudinal center of the body case 41, and positioning holes 49b and 49b are formed symmetrically with respect to the center of the mounting hole 49a on both sides of the mounting hole 49a. . As shown in FIG. 13, a circular shallow recess 52 is formed in the center of the bridge 50. The main body case 41 of the belt fixing device 40 is disposed in the concave portion 52, the fixing screw 53 is passed through the mounting hole 49a, and the tip end portion of the fixing screw 53 is screwed into the bridge 50 to fix the belt fixing device 40. It is attached to the bridge 50 so as to be rotatable around the screw 53. Thereby, the belt fixing device 40 is attached to the center in the left-right direction of the child seat 1 in a state in which the vertical direction can be reversed.
[0026]
On the bottom surface of the recess 52, there is provided a positioning protrusion 54 that fits into the positioning hole 49b when the main body case 41 is correctly attached in the direction of FIG. The protrusion 54 only needs to be able to be positioned at the position of the main body case 41 of the belt fixing device 40 at the position shown in FIG. Note that the attachment of the main body case 41 to the bridge 50 with the fixing screw 53 allows a clearance so that the main body case 41 can rotate over the protrusion 54 so that there is a gap between the main body case 41 and the bridge 50. Keep it. Even if there is such a margin, the main body case 41 is pressed against the bridge 50 by tightening the belts 111 and 112, so there is no possibility that the belt fixing device 40 rotates with respect to the bridge 50 while the child seat 1 is used. .
[0027]
According to the child seat 1 provided with the belt fixing device 40 as described above, as shown in FIG. 14, the belts 111 and 112 are passed through the belt fixing device 40, and the clamper 43 and the lock 45 are sequentially closed. By pulling up 111 in the tightening direction, the base 2 can be firmly fixed to the seat 100. When the direction in which the shoulder belt 111 is fastened coincides with the direction in which the belt fixing device 40 restrains the belts 111 and 112, the belt fixing device 40 is rotated 180 ° on the bridge 50 as indicated by an arrow C in FIG. As a result, the base 2 can be fixed to the seat 100 by matching the direction in which the shoulder belt 111 is loosened with the direction in which the belt fixing device 40 restrains the belts 111 and 112. After the base 2 is fixed to the seat 100, the continuity of the surface of the shell 4 is ensured by closing the recess 4d with a cover (not shown).
[0028]
The fixing of the base 2 by the belt fixing device 40 is effective only when the shell 4 is attached in a forward-facing posture as shown in FIG. When the shell 4 is attached in a rearward posture as shown in FIG. 7B, the shell 4 is seated using a belt through hole 4f (see FIG. 1) provided in the front end portion of the side wall portion 4c of the shell 4. What is necessary is just to fix to 100.
[0029]
The child seat 1 of the above embodiment has the following advantages. First, the base 2 is separated into the lower base portion 10 and the upper base portion 20, and the upper base portion 20 is turned so that the direction of the seat body 3 is reversed in the front-rear direction. It is only necessary to arrange the reclining mechanism 30 between them. For this reason, the restrictions regarding the design of the reclining mechanism 30 are small. The lower base portion 10 and the upper base portion 20 can be brought into contact in a wide range without being obstructed by the reclining mechanism 30. Therefore, even if the seat body 3 is structured to be able to turn, the support area between the fixed side and the movable side of the turning motion can be sufficiently secured to improve the stability of the turning portion.
[0030]
Since the single belt fixing device 40 can cope with the case where the shoulder belt 111 is fastened from either the left or right side, the number of belt fixing devices 40 can be reduced to reduce the cost.
[0031]
Further, as shown in FIG. 8, in the child seat 1 of the present embodiment, the head protection part 4g of the side wall part 4c is deep enough to hide the head of the infant in order to improve the impact resistance performance at the time of a side collision. In addition, the armrest portion 4h of the side wall portion 4c is formed so as to become higher toward the front end 4i of the shell 4 so that the infant's knee portion is substantially hidden.
[0032]
Further, as shown in FIG. 7B, when the shell 4 is attached in the rearward posture, the front end 4 i of the shell 4 is substantially positioned on the extension line of the rear end 12 of the lower base portion 10. FIG. 7B shows a state in which the inclination of the shell 4 is set to approximately the center of the adjustment range by the reclining mechanism 30. Thus, when the front end 4i of the shell 4 is aligned with the rear end 12 of the base 2, the contact range of the child seat 1 with respect to the seat back 102 is expanded, and the stability of the child seat 1 is improved. In particular, since the armrest portion 4h becomes higher toward the front end 4i, the contact length between the front end 4i and the seat back 102 can be increased, and high safety can be realized by these synergistic effects.
[0033]
【The invention's effect】
As described above, according to the child seat of the present invention, since the base itself has a turning function, there is no need to provide a seat turning mechanism between the base and the seat body, and the connection portion between the two is not required. The configuration can be simplified. Since the lower base and the upper base can be brought into contact with each other over a wide range without being affected by the connecting portion between the base and the seat main body, the seat main body can be swung, and the swiveling motion can be reduced. Sufficient support area between the fixed side and the movable side can be ensured to improve the stability of the turning portion.
[Brief description of the drawings]
FIG. 1 is a perspective view of a child seat according to an embodiment of the present invention.
FIG. 2 is a perspective view of the lower surface side of the base.
FIG. 3 is a perspective view of the upper surface side of the base.
FIG. 4 is a longitudinal sectional view along the front-rear direction of the base.
FIG. 5 is a perspective view showing a turning operation of the upper base portion.
FIG. 6 is a longitudinal sectional view along the front-rear direction in a state in which the seat body is attached to the base.
FIG. 7 is a diagram illustrating a state in which the orientation of the seat body is changed back and forth.
FIG. 8 is a view showing a state in which a belt fixing device and a bridge for attaching the belt fixing device are removed from FIG. 1;
FIG. 9 is a perspective view of a belt fixing device.
FIG. 10 is a perspective view of the belt fixing device with the clamper opened.
FIG. 11 is a perspective view showing the internal structure of the belt fixing device.
FIG. 12 is a view showing the operation of the belt fixing device.
FIG. 13 is an enlarged view showing the vicinity of the belt fixing device.
FIG. 14 is a perspective view showing a state in which the seat belt of the vehicle is passed through the belt fixing device.
FIG. 15 is a perspective view showing a state in the middle of changing the direction of the belt fixing device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Child seat 2 Base 3 Seat main body 4 Shell 4a Shell seat part 4b Shell back part 4c Shell side wall part 4e, 4f Belt through-hole 4g Head protection part 4h Armrest part 4i Shell front end 10 Lower base part 11 Lower base part Front end 12 Back end 13 of the lower base part Upper surface 14 of the lower base part 15 Lower surface of the lower base part 15 Connecting bolt 20 Upper base part 21 Lower surface of the upper base part 22 Upper surface of the upper base part 23 Nut 30 Reclining mechanism 31 Fixed side rail 32 Movable Side rail 40 Belt fixing device 41 Main body case 43 Arm 45 Lock 46 Flap 50 Bridge 100 Vehicle seat 101 Seat surface 102 Seat back 111 Shoulder belt 112 Lap belt Q Turning center line

Claims (3)

In a child seat comprising a base and a seat body supported by the base,
The base is mounted on a lower base portion that is placed on a vehicle seat, and is pivotably attached to the lower base portion so that the direction of the vehicle in the front-rear direction can be reversed. With an upper base portion ,
The seat body is attached to the upper base portion via a reclining mechanism ,
The shell of the seat body and the upper base part are connected via the reclining mechanism,
The left and right side wall portions of the shell are provided with belt through holes through which a vehicle seat belt is passed,
The base is provided with a bridge that is arranged so as to straddle the shell in the left-right direction while allowing a reclining operation of the shell with respect to the upper base portion, and has both ends passing through the belt through hole and fixed to the side wall portion of the upper base portion A child seat is provided, wherein a belt fixing device for fixing a seat belt of the vehicle to a base is attached to the bridge . The turning center line of the upper base portion with respect to the lower base portion is inclined with respect to the direction orthogonal to the lower surface of the lower base portion so that the upper side of the turning center line is shifted to the front side in the front-rear direction. The child seat according to claim 1 . The child seat according to claim 1 or 2 , wherein the lower base portion is formed in a shape in which the thickness gradually increases from the front end to the rear end in the front-rear direction.

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