Child seat attachment structure

Abstract

To smoothly guide a fixing part of a child seat to a fixing member side.SOLUTION: A child seat mounting part structure includes a fixing member 24 having a part 28 to be fixed where a fixing part 18 of a child seat 16 is fixed and a guide member 10 provided in a periphery of the fixing member. The guide member 10 has a cylindrical part 36 for guiding the fixing part 18 to a side of the part 28 to be fixed when the fixing part 18 is inserted. In addition, a resistance reduction part (a roller 32, a belt 34, or the like) for reducing friction resistance accompanying sliding between the fixing part 18 and an inner peripheral surface of the cylindrical part 36 is provided along the inner peripheral surface of the cylindrical part 36.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a structure of a child seat attachment portion.

Background Art

[0002] Patent Document 1 below discloses a child seat attachment portion structure that enables a child seat to be attached to a vehicle by inserting a fixing portion (fixing bar) of the child seat into a receiving hole of a seat and fixing the fixing portion to a fixing member. In the child seat attachment portion structure described in this document, a cylindrical member inserted into the receiving hole of the seat is provided, and this cylindrical member is coupled to the fixing member. Further, the cylindrical member is provided with a cover member that opens and closes an opening portion of the cylindrical member. Thereby, in a state where the child seat is not attached to the vehicle, the opening portion of the cylindrical member can be covered by the cover member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a configuration in which a child seat is attached to a vehicle by fixing a fixing portion of the child seat to a fixing member, it is desirable that the fixing portion of the child seat can be smoothly guided to the fixing member side. However, the configuration described in Patent Document 1 above has room for improvement in this regard.

[0005] In consideration of the above facts, an object of the present invention is to obtain a child seat attachment portion structure that can smoothly guide a fixing portion of a child seat to the fixing member side.

Means for Solving the Problems

[0006] The child seat attachment part structure of the first aspect includes a fixing member having a fixed part to which the fixing part of the child seat is fixed, a cylindrical part provided around the fixing member and guiding the fixing part to the fixed part side when the fixing part is inserted, and a resistance reducing part provided along the inner peripheral surface of the cylindrical part to reduce the frictional resistance accompanying the sliding of the fixing part and the inner peripheral surface of the cylindrical part, and a guide member having the resistance reducing part.

[0007] According to the child seat attachment part structure of the first aspect, when the fixing part of the child seat is inserted into the cylindrical part of the guide member, the fixing part of the child seat is guided to the fixed part side of the fixing member. Then, the fixing part of the child seat is fixed to the fixed part of the fixing member. Here, the guide member is provided with a resistance reducing part along the inner peripheral surface of the cylindrical part to reduce the frictional resistance accompanying the sliding of the fixing part and the inner peripheral surface of the cylindrical part. Thereby, the resistance when inserting the fixing part of the child seat into the cylindrical part of the guide member is reduced, and the fixing part of the child seat can be smoothly guided to the fixing member side.

[0008] The child seat attachment part structure of the second aspect is the child seat attachment part structure of the first aspect, wherein the resistance reducing part includes a plurality of rollers rotatably supported by the guide member and a belt formed in an annular shape and wound around the plurality of rollers, and when the fixing part is inserted into the cylindrical part, the fixing part contacts the belt and the rollers rotate.

[0009] According to the child seat attachment part structure of the second aspect, when the fixing part of the child seat is inserted into the cylindrical part of the guide member, the fixing part contacts the belt and the rollers rotate. Thereby, the sliding of the fixing part and the inner peripheral surface of the cylindrical part is suppressed, and the fixing part of the child seat can be smoothly guided to the fixing member side.

[0010] The child seat attachment portion structure of the third aspect is the child seat attachment portion structure of the first aspect or the second aspect, wherein the resistance reduction portion is a protrusion protruding from the inner peripheral surface of the cylindrical portion toward the fixed portion side, and when the fixed portion is inserted into the cylindrical portion, the fixed portion contacts the tip surface in the protruding direction of the protrusion.

[0011] According to the child seat attachment portion structure of the third aspect, when the fixed portion of the child seat is inserted into the cylindrical portion of the guide member, the fixed portion contacts the tip surface in the protruding direction of the protrusion. As a result, compared with a configuration without the protrusion, the area where the fixed portion and the inner peripheral surface of the cylindrical portion slide is reduced, and the frictional resistance associated with the sliding of both is reduced. As a result, the fixed portion of the child seat can be smoothly guided to the fixed member side.

[0012] The child seat attachment portion structure of the fourth aspect is the child seat attachment portion structure of the third aspect, wherein the surface of the protrusion on the fixed portion side is formed in a cylindrical surface shape with an axial direction intersecting the direction in which the fixed portion is inserted into the cylindrical portion.

[0013] According to the child seat attachment portion structure of the fourth aspect, the surface of the protrusion on the fixed portion side is formed in a cylindrical surface shape with an axial direction intersecting the direction in which the fixed portion is inserted into the cylindrical portion. As a result, compared with a configuration in which the surface of the protrusion on the fixed portion side is not formed in a cylindrical surface shape, the frictional resistance associated with the sliding of the fixed portion and the inner peripheral surface of the cylindrical portion can be effectively reduced.

[0014] The child seat attachment portion structure of the fifth aspect is the child seat attachment portion structure according to claim 3, wherein the protrusion extends along the direction in which the fixed portion is inserted into the cylindrical portion.

[0015] According to the child seat attachment portion structure of the fifth aspect, the protrusion extends along the direction in which the fixing portion is inserted into the cylindrical portion. Thereby, compared with a configuration in which the protrusion extends along a direction different from the direction in which the fixing portion is inserted into the cylindrical portion, the frictional resistance associated with the sliding of the fixing portion and the inner peripheral surface of the cylindrical portion can be effectively reduced.

[0016] The child seat attachment portion structure of the sixth aspect is the child seat attachment portion structure of any one of the first aspect to the fifth aspect, and the position and dimensions of the resistance reducing portion are set so that the fixing portion is inserted into the cylindrical portion in a press-fitted state.

[0017] According to the child seat attachment portion structure of the sixth aspect, the fixing portion is inserted into the cylindrical portion in a press-fitted state. Thereby, in a state where the fixing portion of the child seat is fixed to the fixed portion of the fixing member, the posture of the fixing portion with respect to the guide member can be stabilized.

Advantages of the Invention

[0018] The child seat attachment portion structure according to the present invention has an excellent effect of being able to smoothly guide the fixing portion of the child seat to the fixing member side.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

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Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0020] The structure of a child seat attachment portion according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

[0021] FIG. 1 shows a partial cross-sectional view of a child seat attachment portion 12 provided with a guide member 10 of the first embodiment as viewed from the vehicle width direction. In the figure, arrow FR indicates the front of the vehicle, arrow UP indicates the upper side of the vehicle, arrow RH indicates the right side in the vehicle width direction, and arrow LH indicates the left side in the vehicle width direction. Also, when the front-back, up-down, and left-right directions are used without special mention in the following description, they indicate the front-back in the vehicle front-back direction, the up-down in the vehicle up-down direction, and the left-right in the vehicle width direction.

[0022] As shown in FIGS. 1 and 2, the child seat attachment portion 12 is provided between the seat cushion 14 and a seat back (not shown). The fixing portion 18 of the child seat 16 is fixed to the child seat attachment portion 12.

[0023] As shown in FIG. 1, the child seat 16 includes a child seat main body 20 provided on the seat cushion 14 and on which an infant sits, and a rectangular parallelepiped fixing portion 18 protruding rearward from the lower end portion of the child seat main body 20. An engaging groove 22 that engages with a fixing member 24 described later is formed at the rear end portion of the fixing portion 18. The shape of the edge of the engaging groove 22 as viewed in the vehicle width direction is formed in a substantially U shape with the rear side open.

[0024] The child seat attachment portion 12 includes a fixing member 24 fixed to a skeleton member of the vehicle body or a vehicle seat, and a guide member 10 attached to the fixing member 24.

[0025] The fixing member 24 is formed by bending a round bar-shaped steel material or the like. The fixing member 24 includes a pair of left and right base portions 26 arranged at intervals in the left-right direction. The pair of left and right base portions 26 extend while inclining upward as they go forward. The rear end portions of the pair of left and right base portions 26 are fixed to a skeleton member of the vehicle body or a vehicle seat. The fixing member 24 also includes a fixed portion 28 that connects the front end portions of the pair of left and right base portions 26 in the left-right direction.

[0026] As shown in FIGS. 1 and 3, the guide member 10 includes a guide member main body 30, two rollers 32 supported by the guide member main body 30, and a belt 34 wound around the two rollers.

[0027] The guide member body 30 includes a cylindrical portion 36 formed in a rectangular cylindrical shape, and a flange portion 38 that bends and extends from the front end portion of the cylindrical portion 36. Here, the shape of the space inside the cylindrical portion 36 corresponds to the shape of the fixing portion 18 of the child seat 16. Thereby, it is possible to insert the fixing portion 18 of the child seat 16 into the cylindrical portion 36. The direction in which the fixing portion 18 of the child seat 16 is inserted into the cylindrical portion 36 is indicated by an arrow S, and this direction will be referred to as the insertion direction.

[0028] The cylindrical portion 36 includes a pair of left and right side wall portions 40 that are spaced apart in the left - right direction and extend in the up - down direction and the front - rear direction. The cylindrical portion 36 also includes an upper wall portion 42 that connects the upper ends of the pair of left and right side wall portions 40 in the left - right direction, and a lower wall portion 44 that connects the lower ends of the pair of left and right side wall portions 40 in the left - right direction. The flange portion 38 includes a portion that bends and extends to the right from the front end of the right - hand side wall portion 40, a portion that bends and extends to the left from the front end of the left - hand side wall portion 40, a portion that bends and extends upward from the front end of the upper wall portion 42, and a portion that bends and extends downward from the front end of the lower wall portion 44.

[0029] At the vertical intermediate portion at the rear end of the pair of side wall portions 40, mounting recesses 46 that are open on the rear side are respectively formed. By engaging both left - right side portions of the fixed portion 28 of the fixing member 24 with the mounting recesses 46 of the pair of side wall portions 40, the guide member 10 (guide member body 30) is attached to the fixing member 24.

[0030] As shown in FIGS. 3 and 4, the guide member body 30 includes two rail - shaped protrusions 48 as a resistance - reducing portion and a protrusion portion that protrudes from the right - hand side wall portion 40 toward the left. The two rail - shaped protrusions 48 are arranged at intervals in the vertical direction with the mounting recess 46 interposed therebetween, and extend along the insertion direction. Also, the protruding height of the front end portions of the two rail - shaped protrusions 48 from the right - hand side wall portion 40 gradually decreases toward the front side.

[0031] As shown in FIGS. 3 and 5, the guide member body 30 includes two rail-shaped protrusions 48 as a resistance reduction portion and a protrusion that protrudes from the left side wall portion 40 toward the right side. Note that the two rail-shaped protrusions 48 protruding from the left side wall portion 40 are configured in the same manner as the two rail-shaped protrusions 48 protruding from the right side wall portion 40, except that they are symmetric with respect to the two rail-shaped protrusions 48 protruding from the right side wall portion 40.

[0032] As shown in FIGS. 4 and 5, the guide member body 30 includes two rail-shaped protrusions 50 as a resistance reduction portion and a protrusion that protrude from the upper wall portion 42 toward the lower side. The two rail-shaped protrusions 50 are arranged at intervals in the left-right direction and extend along the insertion direction. Further, the protruding height of the front end portions of the two rail-shaped protrusions 50 from the upper wall portion 42 gradually decreases toward the front side.

[0033] As shown in FIGS. 1 and 3, a roller arrangement recess 52 with an open upper side is formed in the central portion of the lower wall portion 44 in the left-right direction. Shaft member engaging recesses 54 for supporting shaft members 56 of two rollers 32, which will be described later, are formed on both sides of the roller arrangement recess 52 in the left-right direction.

[0034] The roller 32 includes a shaft member 56 formed in a columnar shape with the left-right direction as the axial direction, and a roller body 58 formed in a columnar shape with the left-right direction as the axial direction and having an outer diameter set larger than the outer diameter of the shaft member 56. The roller body 58 is fixed to the central portion of the shaft member 56 in the left-right direction. Then, by engaging the shaft members 56 of the two rollers 32 with the aforementioned shaft member engaging recesses 54, the two rollers 32 are rotatably supported by the guide member body 30. Further, in a state where the two rollers 32 are rotatably supported by the guide member body 30, most of the roller bodies 58 of the two rollers 32 are arranged within the aforementioned roller arrangement recess 52. Here, in a state where most of the roller bodies 58 of the two rollers 32 are arranged within the aforementioned roller arrangement recess 52, the upper end portions of the roller bodies 58 of the two rollers 32 protrude upward from the lower wall portion 44.

[0035] The belt 34 is an endless belt formed by winding a belt-shaped member in a ring shape. The width dimension of this belt 34 is set to be substantially the same as the dimension of the roller main body 58 in the left-right direction. And this belt 34 is wound around between the roller main bodies 58 of the two rollers 32 respectively. Note that the belt 34 constitutes a resistance reduction part together with the two rollers 32.

[0036] Next, the dimensional relationships of each part will be described.

[0037] As shown in FIG. 6, the details of the dimensions and tolerances of each part are calculated by the calculation of cumulative tolerances (square root of the sum of squares). Also, the dimensions of the present embodiment are premised on the implementation of the calculation of cumulative tolerances. First, as a reference, a reference point O is set on the fixing member 24. The reference point O is a position corresponding to the centroid of the fixed part 28 of the fixing member 24 when viewed from the left-right direction and is the center position in the left-right direction. Also, the distance from the lower wall portion 44 of the guide member 10 to the upper surface 34A of the belt 34 is defined as dimension A. Further, the distance from the reference point O to the lower wall portion 44 of the guide member 10 is defined as dimension B, and the distance from the reference point O to the upper wall portion 42 of the guide member 10 is defined as dimension C. Also, the protruding height from the upper wall portion 42 of the rail-shaped protrusion 50 is defined as dimension X.

[0038] Also, in a state where the engagement groove 22 of the fixing portion 18 and the fixed portion 28 of the fixing member 24 are completely engaged, the position where the reference point O of the fixing member 24 is arranged in the engagement groove 22 is defined as the engagement point P. Further, the distance from the engagement point P to the lower surface 18A of the fixing portion 18 is defined as D, and the distance from the engagement point P to the upper surface 18B of the fixing portion 18 is defined as E.

[0039] And in order to make the roller 32 and the belt 34 function, it is preferable to satisfy the following formula 1. B - A > D ··· Formula 1 Note that the variation in B - A may be absorbed by dimension A.

[0040] In addition, in order to enable the rail-shaped protrusion 50 to function, it is preferable to satisfy the following formula 2. C - X > E ··· Formula 2 Note that the variation in the dimension C - X may be absorbed by the dimension X.

[0041] Here, it is conceivable that the vertical position of the child seat 16 varies due to the sinking of the seat cushion 14 or the like. Let the amount of variation downward in the position of the fixing portion 18 accompanying the variation in the vertical position of the child seat 16 be the dimension F. Note that the direction of the dimension F is the direction from the upper surface 18B to the lower surface 18A of the fixing portion 18 and is orthogonal to the insertion direction.

[0042] As shown in FIG. 7, let the distance from the reference point O to one side wall portion 40 of the guide member 10 and the distance from the reference point O to the other side wall portion 40 of the guide member 10 be the dimension G. Also, let the protruding height of the rail-shaped protrusion 48 from the side wall portion 40 be the dimension Y. Further, let the distance from the engagement point P of the fixing portion 18 to the right surface 18R and the distance from the engagement point P of the fixing portion 18 to the left surface 18L be the dimension H.

[0043] And in order to enable the rail-shaped protrusion 48 to function, it is preferable to satisfy the following formula 3. G - Y > H ··· Formula 3 Note that the variation in the dimension G - Y may be absorbed by the dimension Y.

[0044] (Operations and Effects of the Present Embodiment) Next, the operations and effects of the present embodiment will be described.

[0045] As shown in FIG. 1, to attach the child seat 16 to the vehicle, first, the fixing portion 18 of the child seat 16 is inserted into the cylindrical portion 36 of the guide member 10, and the fixing portion 18 of the child seat 16 is moved along the cylindrical portion 36 toward the fixed portion 28 side of the fixing member 24. Thereby, as shown in FIG. 2, the engaging groove 22 of the fixing portion 18 and the fixed portion 28 of the fixing member 24 are engaged, and the child seat 16 is attached to the vehicle. Note that in a state where the engagement between the engaging groove 22 of the fixing portion 18 and the fixed portion 28 of the fixing member 24 is completed, the engagement between the engaging groove 22 of the fixing portion 18 and the fixed portion 28 of the fixing member 24 is prevented from coming off.

[0046] Here, as shown in FIGS. 1, 3, and 5, two rollers 32 and a belt 34 are provided along the lower wall portion 44 of the cylindrical portion 36 of the guide member 10 of the present embodiment. Therefore, when the fixing portion 18 of the child seat 16 is inserted into the cylindrical portion 36 of the guide member 10, the fixing portion 18 comes into contact with the belt 34 and the two rollers 32 rotate. Thereby, the sliding between the fixing portion 18 and the lower wall portion 44 of the cylindrical portion 36 is suppressed, and the fixing portion 18 of the child seat 16 can be smoothly guided toward the fixed portion 28 side of the fixing member 24.

[0047] Further, in a configuration in which the two rollers 32 and the belt 34 are provided along the lower wall portion 44 of the cylindrical portion 36, even if the seat cushion 14 sinks downward due to the own weight of the child seat 16 (even if the dimension F in FIG. 6 increases), when the fixing portion 18 of the child seat 16 is inserted into the cylindrical portion 36 of the guide member 10, the fixing portion 18 can be smoothly guided to a predetermined vertical position along the belt 34 and the two rollers 32.

[0048] Further, the guide member 10 of the present embodiment is provided with a rail-shaped protrusion 48 protruding from the side wall portion 40 and a rail-shaped protrusion 50 protruding from the upper wall portion 42. Therefore, when the fixing portion 18 of the child seat 16 is inserted into the cylindrical portion 36 of the guide member 10, the fixing portion 18 comes into contact with the tip surfaces of the rail-shaped protrusions 48 and 50 in the protruding direction. As a result, compared with the configuration without the rail-shaped protrusions 48 and 50, the area where the fixing portion 18 and the side wall portion 40 and the upper wall portion 42 of the cylindrical portion 36 slide is reduced, and the frictional resistance associated with the sliding of both is reduced. As a result, the fixing portion 18 of the child seat 16 can be smoothly guided toward the fixed portion 28 side of the fixing member 24.

[0049] Further, the rail-shaped protrusions 48 and 50 are configured to extend in the insertion direction. As a result, compared with the configuration in which the rail-shaped protrusions 48 and 50 extend along a direction different from the insertion direction, the frictional resistance associated with the sliding of the fixing portion 18 and the side wall portion 40 and the upper wall portion 42 of the cylindrical portion 36 can be effectively reduced.

[0050] In the example described above, the dimensions of each part are set so as to satisfy the aforementioned formulas 1, 2, and 3. However, the present invention is not limited to this. For example, by setting the dimensional relationship of each part so as not to satisfy formulas 1, 2, and 3, the fixing portion 18 of the child seat 16 can be configured to be inserted into the cylindrical portion 36 of the guide member 10 in a press-fitted state. That is, when the fixing portion 18 of the child seat 16 is press-fitted into the cylindrical portion 36 of the guide member 10, the rail-shaped protrusions 48 and 50 can be configured to be deformed. In this way, by inserting the fixing portion 18 of the child seat 16 into the cylindrical portion 36 of the guide member 10 in a press-fitted state, the posture of the fixing portion 18 with respect to the guide member 10 can be stabilized in a state where the fixing portion 18 of the child seat 16 is fixed to the fixed portion 28 of the fixing member 24.

[0051] (Guide member 60 of the second embodiment and guide member 62 of the third embodiment) Next, a configuration using the guide member 60 of the second embodiment and the guide member 62 of the third embodiment will be described. In the configuration using the guide member 60 of the second embodiment and the guide member 62 of the third embodiment, members and parts corresponding to those in the configuration using the guide member 10 of the first embodiment described above may be given the same reference numerals as those in the configuration using the guide member 10 of the first embodiment, and the description thereof may be omitted.

[0052] As shown in FIG. 8, the guide member 60 of the second embodiment is configured in the same manner as the guide member 10 of the first embodiment, except that three semi-cylindrical protrusions 64 are provided as a resistance reducing portion and a protrusion portion instead of the two rollers 32 and the belt 34.

[0053] As shown in FIGS. 8 and 9, the semi-cylindrical protrusion 64 protrudes upward from the lower wall portion 44 and extends along a direction orthogonal to the insertion direction. The upper surface of the intermediate portion in the left-right direction of the semi-cylindrical protrusion 64 is a surface curved in a cylindrical surface shape with the direction orthogonal to the insertion direction as the axial direction. Note that both left and right ends of the semi-cylindrical protrusion 64 are curved in a spherical shape.

[0054] As shown in FIG. 9, the three semi-cylindrical protrusions 64 are arranged at equal intervals along the insertion direction. Also, the protruding heights (dimension A) of the three semi-cylindrical protrusions 64 from the lower wall portion 44 are the same as each other.

[0055] In the configuration using the guide member 60 of the second embodiment described above, when the fixing portion 18 of the child seat 16 is inserted into the cylindrical portion 36 of the guide member 10, the fixing portion 18 sequentially contacts the three semi-cylindrical protrusions 64. As a result, compared with the configuration without the three semi-cylindrical protrusions 64, the area where the fixing portion 18 and the lower wall portion 44 of the cylindrical portion 36 slide is reduced, and the frictional resistance associated with the sliding of both is reduced. As a result, the fixing portion 18 of the child seat 16 can be smoothly guided to the fixed portion 28 side of the fixing member 24.

[0056] Further, in the guide member 60 of the second embodiment, the upper surface of the intermediate portion in the left - right direction of the semi - cylindrical protrusion 64 is a surface curved in a cylindrical - surface shape with the direction orthogonal to the insertion direction as the axial direction. Thereby, compared with the configuration in which the upper surface of the semi - cylindrical protrusion 64 is not formed in a cylindrical - surface shape, the frictional resistance associated with the sliding between the fixing portion 18 and the lower wall portion 44 of the cylindrical portion 36 can be effectively reduced.

[0057] In the guide member 60 of the second embodiment, the protruding heights of the three semi - cylindrical protrusions 64 from the lower wall portion 44 are set to be the same. However, the present invention is not limited to this. For example, the protruding heights of the three semi - cylindrical protrusions 64 from the lower wall portion 44 may be made different from each other. Also, like the guide member 62 of the third embodiment shown in FIG. 10, a configuration in which one semi - cylindrical protrusion 64 is provided along the lower wall portion 44 may be adopted. The number of semi - cylindrical protrusions 64 may be appropriately set in consideration of the load borne by one semi - cylindrical protrusion 64 and the like.

[0058] (Guide member 66 of the fourth embodiment and guide member 68 of the fifth embodiment) Next, a configuration using the guide member 66 of the fourth embodiment and the guide member 68 of the fifth embodiment will be described. In the configuration using the guide member 66 of the fourth embodiment and the guide member 68 of the fifth embodiment, members and portions corresponding to those in the configuration using the guide member 10 of the first embodiment described above may be given the same reference numerals as those in the configuration using the guide member 10 of the first embodiment, and the description thereof may be omitted.

[0059] As shown in FIG. 11, the guide member 66 of the fourth embodiment is configured in the same manner as the guide member 10 of the first embodiment, except that two rail - shaped protrusions 70 are provided as a resistance - reducing portion and a protrusion portion instead of the two rollers 32 and the belt 34.

[0060] As shown in FIGS. 11 and 12, the rail-shaped protrusions 70 protrude upward from the lower wall portion 44 and extend along the insertion direction. The two rail-shaped protrusions 70 are set to have the same shape and dimensions, and are arranged at intervals in the left-right direction. Further, the protrusion height of the front end portions of the two rail-shaped protrusions 70 from the lower wall portion 44 gradually decreases toward the front side. Further, the width dimension of the two rail-shaped protrusions 70 in the left-right direction is set to be larger than the width dimension of the rail-shaped protrusion 50 protruding from the upper wall portion 42 and the width dimension of the rail-shaped protrusion 48 protruding from the side wall portion 40 in the up-down direction.

[0061] In the configuration using the guide member 66 of the fourth embodiment described above, when the fixing portion 18 of the child seat 16 is inserted into the cylindrical portion 36 of the guide member 10, the fixing portion 18 comes into contact with the two rail-shaped protrusions 70. As a result, compared with the configuration without the two rail-shaped protrusions 70, the area where the fixing portion 18 and the lower wall portion 44 of the cylindrical portion 36 slide becomes smaller, and the frictional resistance associated with the sliding of both is reduced. As a result, the fixing portion 18 of the child seat 16 can be smoothly guided toward the fixed portion 28 side of the fixing member 24.

[0062] In the guide member 66 of the fourth embodiment, an example in which the two rail-shaped protrusions 70 are provided along the lower wall portion 44 has been described, but the present invention is not limited to this. For example, as in the guide member 68 of the fifth embodiment shown in FIG. 13, a configuration in which one rail-shaped protrusion 70 is provided along the lower wall portion 44 may be used. The number of the rail-shaped protrusions 70 may be appropriately set in consideration of the load received by one rail-shaped protrusion 70 and the like.

[0063] Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that various modifications can be made and implemented within the scope not departing from the gist of the present invention.

Description of Reference Numerals

[0064] 10 Guide member 16 Child seat 18 Fixing part 28 Fixed part 24 Fixing member 32 Roller (resistance reduction part) 34 Belt (resistance reduction part) 36 Cylindrical part 48 Rail-shaped protrusion (resistance reduction part) 50 Rail-shaped protrusion (resistance reduction part) 60 Guide member 62 Guide member 64 Semi-cylindrical protrusion (resistance reduction part) 66 Guide member 68 Guide member 70 Rail-shaped protrusion (resistance reduction part)

Claims

1. a fixing member having a fixed part to which a fixing part of a child seat is fixed; a cylindrical part provided around the fixing member and guiding the fixing part toward the fixed part side when the fixing part is inserted; and a resistance reducing part provided along an inner peripheral surface of the cylindrical part and reducing frictional resistance accompanying sliding between the fixing part and the inner peripheral surface of the cylindrical part, the guide member having the resistance reducing part; comprising; the resistance reducing part includes a plurality of rollers rotatably supported by the guide member and a belt formed in an annular shape and wound around the plurality of rollers; a child seat mounting part structure including rotation of the roller when the fixing part contacts the belt when the fixing part is inserted into the cylindrical part.

2. the resistance reducing part is a protrusion protruding from the inner peripheral surface of the cylindrical part toward the fixing part side; the child seat mounting part structure according to claim 1, wherein when the fixing part is inserted into the cylindrical part, the fixing part contacts a tip surface in a protruding direction of the protrusion.

3. The child seat mounting part structure according to claim 2, wherein a surface on the fixing part side of the protrusion is formed in a cylindrical surface shape with an axial direction being a direction intersecting a direction in which the fixing part is inserted into the cylindrical part.

4. the protrusion extends along a direction in which the fixing part is inserted into the cylindrical part, the child seat mounting part structure according to claim 2.

5. the child seat mounting part structure according to any one of claims 1 to 4, wherein a position and dimensions of the resistance reducing part are set such that the fixing part is inserted into the cylindrical part in a press-fitted state.

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