JP2024023154A - child seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a child seat which enables reduction of the number of components of a structure, in which a seat rotates and slides relative to a base and is attached to or detached from the base, to achieve high operability.

SOLUTION: A child seat 10 includes: a seat 12 on which an infant is seated; and a base 14 which is attached to a vehicle seat to support the seat so as to enable two motions of the seat, rotation around its axis or sliding in which the seat linearly moves. The child seat 10 includes: a seat fixing part 60 capable of fixing the seat at a center position of the base; operation members 34 for releasing fixture of the seat fixing part; and a rotary connection part 50 capable of rotatably supporting the seat on the base when the fixture of the seat fixing part is released by the operation members. The rotary connection part 50 has a fitting structure comprising a recessed part of a base upper surface and a protruding part of a seat lower surface. The protruding part is biased toward the recessed part. One of or both of an end of the protruding part and an opening peripheral edge of the recessed part is formed in an inclined or spherical shape.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a child seat in which a seat on which an infant is seated rotates, slides, and is attached to and detached from a base attached to a vehicle seat.

It is mandatory by law to always use a child seat when driving with an infant in a vehicle.
Conventionally, various child seats have been proposed. The child seat disclosed in Patent Document 1 can perform a reclining operation using a reclining operation lever and a rotating operation using a rotation operation lever. An operating switch is provided to prevent the other operating lever from moving when one operating lever is operated. This makes it possible to prevent the reclining and rotating movements from occurring at the same time.

However, the child seat disclosed in Patent Document 1 requires separate operating levers for reclining and rotating operations, and also requires an operating switch to prevent simultaneous operations, increasing the number of parts. Therefore, there was a risk that the cost would increase. Furthermore, when the number of parts increases, the layout of the design is restricted.

Patent No. 6203268

In view of the above-mentioned problems of the prior art, an object of the present invention is to provide a child seat with good operability by reducing the number of parts in which the seat rotates, slides, and is attached to and detached from the base.

As a first means for solving the above problems, the present invention provides a seat on which an infant sits, and a slide that is attached to a vehicle seat so that the seat rotates around an axis or moves linearly. A child seat comprising a base capable of supporting movement,
a seat fixing part capable of fixing the seat at a central position of the base;
an operating member that releases the fixation of the seat fixing part;
a rotary connection part that can rotatably support the seat on the base when the seat fixing part is released from the seat fixing part by the operating member;
The rotary connection part has a structure in which a recess on the upper surface of the base and a projection on the lower surface of the seat fit together, the projection is biased toward the recess, and the end of the projection and the recess are connected to each other. The object of the present invention is to provide a child seat characterized in that one or both of the peripheral edges of the opening are formed in an inclined or spherical shape.
According to the first means, when the seat on which an infant is seated rotates and slides with respect to the base attached to the vehicle seat, it can be performed with one operating member, and the number of parts of the operating member is reduced. can be reduced and the degree of freedom in design layout can be increased.
Furthermore, when attaching the seat, it can be easily attached to the center position of the base.

As a second means for solving the above problem, the present invention provides a child seat characterized in that, in the first means, the seat fixing section is provided integrally with a rotating coupling section. .
According to the second means, by forming the parts using the same member, the number of parts can be reduced and the degree of freedom in design layout can be increased.

As a third means for solving the above problem, the present invention provides, in the first or second means, that the rotary connection section has an annular recess provided on the upper surface of the base arranged concentrically with the rotation center of the seat. The object of the present invention is to provide a child seat characterized by the following characteristics.
According to the third means, by rotating on the concentric circle around the rotation center, the load can be distributed over the concentric circle without being concentrated on the central axis during the rotation operation.
As a fourth means for solving the above-mentioned problems, the present invention provides, in the second means, that the recess of the rotary connection part has an opening periphery having an inclined shape, and the depth of the inclination is equal to that of the rectangular recess of the seat fixing part. It is an object of the present invention to provide a child seat characterized in that the convex portion is made shallower than the depth, and only the end portion in the direction in which the seat slides is chamfered.
According to the fourth means, when the seat is returned from the slide position to the center position, the seat does not pass the center position and slide in the opposite direction.

When the seat on which an infant is seated rotates and slides relative to the base attached to the vehicle seat, this can be done with one operating member, reducing the number of operating member parts and improving the design layout. You can increase your degree of freedom.
Furthermore, when attaching the seat, it can be easily attached to the center position of the base.

1 is an exploded perspective view of the child seat of Example 1. FIG. 2 is a sectional view taken along line AA in FIG. 1. FIG. 2 is a sectional view taken along line BB in FIG. 1. FIG. 2 is a sectional view taken along the line CC in FIG. 1. FIG. 2 is a sectional view taken along line DD in FIG. 1. FIG. FIG. 2 is a connected cross-sectional view and a partially enlarged view of a rotary connection section in which the seat of Example 1 is arranged in the center position. FIG. 2 is a connected cross-sectional view and a partially enlarged view of a seat fixing part in which the seat of Example 1 is arranged in the center position. FIG. 2 is a connected cross-sectional view and a partially enlarged view of the rotary connecting portion with the seat fixing portion of Example 1 released. FIG. 2 is a connected cross-sectional view and a partially enlarged view of the seat fixing portion of Example 1 with the seat fixing portion released. FIG. 1 is a connection sectional view 1 of a rotary connection portion on which a seat slides in Example 1, and a partially enlarged view. FIG. 1 is a connected sectional view 1 of a seat fixing portion on which a seat slides in Example 1, and a partially enlarged view. FIG. 2 is a partially enlarged view of a connection cross-sectional view of the rotary connection portion on which the seat slides in Example 1; FIG. 2 is a connected sectional view 2 of the seat fixing portion on which the seat slides in Example 1, and a partially enlarged view. FIG. 3 is an exploded perspective view of a child seat according to a second embodiment. 15 is a sectional view taken along line AA in FIG. 14. FIG. 15 is a sectional view taken along line BB in FIG. 14. FIG. 15 is a sectional view taken along the line CC in FIG. 14. FIG. 15 is a sectional view taken along line DD in FIG. 14. FIG. FIG. 6 is a connected cross-sectional view and a partially enlarged view of a rotary connection portion in which the seat of Example 2 is arranged in the center position. FIG. 3 is a connected cross-sectional view and a partially enlarged view of a seat fixing part in which the seat of Example 2 is arranged at the center position. FIG. 7 is a connected cross-sectional view and a partially enlarged view of the seat fixing portion of Example 2 with the seat fixing portion released. FIG. 1 is a partially enlarged view of a connecting cross-sectional view of a rotary connection portion on which a seat slides according to a second embodiment. FIG. 1 is a connected sectional view 1 and a partially enlarged view of a seat fixing portion on which a seat slides according to a second embodiment. FIG. 2 is a connection cross-sectional view 2 and a partially enlarged view of the rotary connection portion on which the seat slides according to the second embodiment. FIG. 2 is a connected sectional view 2 of a seat fixing portion on which the seat slides according to the second embodiment, and a partially enlarged view. FIG. 3 is an exploded perspective view of a child seat according to a third embodiment. 27 is a sectional view taken along line AA in FIG. 26. FIG. 27 is a sectional view taken along line BB in FIG. 26. FIG. 27 is a sectional view taken along line CC in FIG. 26. FIG. 27 is a sectional view taken along line DD in FIG. 26. FIG. FIG. 7 is a connected cross-sectional view and a partially enlarged view of a rotary connection section in which the seat of Example 3 is arranged in the center position. FIG. 7 is a connected cross-sectional view and a partially enlarged view of a seat fixing part in which the seat of Example 3 is arranged at the center position. FIG. 7 is a connected cross-sectional view and a partially enlarged view of the rotary connecting portion with the seat fixing portion of Example 3 released. FIG. 7 is a connected cross-sectional view and a partially enlarged view of the seat fixing portion of Example 3 with the seat fixing portion released. FIG. 1 is a partially enlarged view of a connecting cross-sectional view of a rotary connecting portion on which a seat slides according to a third embodiment. FIG. 1 is a connected sectional view 1 and a partially enlarged view of a seat fixing portion on which a seat slides in Example 3; FIG. 2 is a partially enlarged view of a connection cross-sectional view of a rotary connection portion on which a seat slides in Example 3; FIG. 2 is a connected sectional view 2 and a partially enlarged view of the seat fixing portion on which the seat slides according to the third embodiment. FIG. 4 is an explanatory view of the center hole 240a of the rotary connection portion of Example 4, and is an enlarged partial cross-sectional view taken along line AA of the base. FIG. 7 is an explanatory diagram of a convex portion 320 of the rotational connection portion of Example 4, and is an enlarged view of the convex portion. FIG. 2 is an overall view of the child seat and an enlarged view of the rotating connection portion when the seat is rotated 90 degrees to the left. FIG. 6 is an enlarged cross-sectional view of a rotary connection portion that slides the seat from the center position to the left. FIG. 3 is an enlarged cross-sectional view of a rotary connection that slides the seat to a central position.

Embodiments of the child seat of the present invention will be described in detail below with reference to the drawings. In this embodiment, the longitudinal direction (front/rear) indicates the front/rear direction of the vehicle, and the lateral direction indicates the direction toward the door of the vehicle.
The child seat 10 of the present invention includes a seat 12 on which an infant is seated, and a base that is attached to a vehicle seat and supports the seat 12 so that it can rotate around an axis or slide the seat 12 in a linear manner. It is equipped with 14. Then, a seat fixing section 60 that can fix the seat 12 at the center position of the base 14, an operating member 34 that releases the fixing of the seat fixing section 60, and an operating member 34 that releases the fixing of the seat fixing section 60 When the seat 12 is rotatably supported on the base 14, the rotary connection part 50 has a center hole 24a, a recess 25, or an annular recess 27, which is a recess on the upper surface of the base 14. The projection 32 on the lower surface of the seat has a fitting structure, and the projection 32 is biased toward the center hole 24a, the recess 25, or the annular recess 27, and the end of the projection 32 and One or both of the opening peripheries of the recess are formed into an inclined or spherical shape.

[Example 1] Integrated type (rotating connection part 50 and seat fixing part 60)
FIG. 1 is an exploded perspective view of a child seat according to a first embodiment. FIG. 2 is a sectional view taken along line AA in FIG. FIG. 3 is a sectional view taken along line BB in FIG. FIG. 4 is a sectional view taken along the line CC in FIG. FIG. 5 is a sectional view taken along line DD in FIG.
As shown in the figure, the child seat 10 of the first embodiment includes a flanged disc 40 on the lower surface of the seat 12, a convex portion 32 and a rectangular member 33 protruding from the flanged disc 40, and a T into which the flanged disc 40 fits on the upper surface of the base 14. The T-groove 20 has a groove 20 and a rectangular recess 24 in which a protrusion 32 and a rectangular member 33 fit into the bottom surface of the T-groove 20. Although the rectangular recesses 24 are installed at locations where the seat 12 is at the center position with respect to the base 14, a plurality of rectangular recesses 24 may be arranged in parallel in the horizontal direction. The longitudinal direction of the rectangular member 33 is formed along the front-rear direction of the seat 12. Two operating levers serving as operating members 34 are arranged on the left and right side surfaces of the seat 12.

The rotary connection portion 50 of the first embodiment employs a fitting structure consisting of a convex portion 32 on the seat 12 side and a center hole 24a of a rectangular concave portion 24 serving as a concave portion on the base 14 side. The rotary connection part 50 rotatably supports the seat 12 at a central position on the base 14. The convex portion 32 is a cylindrical member disposed on the rotation axis of the seat 12. The rectangular recess 24 has a center hole 24a into which the protrusion 32 fits. Furthermore, the center hole 24a is formed into an inclined shape by counterboring and chamfering the opening periphery (see FIGS. 1 and 2).

The seat fixing portion 60 of the first embodiment employs a fitting structure consisting of a rectangular member 33 on the seat 12 side and a rectangular recess 24 on the base 14 side. The seat fixing section 60 of the first embodiment can fix the seat 12 at a central position on the base 14 facing the front or the back. The rectangular member 33 is an integrally formed rectangular member extending symmetrically from the convex portion 32 along the front-rear direction. The convex portion 32 projects longer from the lower surface of the sheet 12 than the rectangular member 33. The rectangular recess 24 extends symmetrically from the center hole 24a along the front-rear direction. The center hole 24a is formed deeper than the rectangular recess 24.

The convex portion 32 and the rectangular member 33 are biased from the lower surface of the sheet 12 by biasing means so as to protrude into the lower center hole 24a and the rectangular recess 24 (see FIGS. 4 and 5). When the convex part 32 and the rectangular member 33 are operated, the convex part 32 retreats from the bottom of the center hole 24a to the bottom of the rectangular recess by operating the lever of the operating member 34 on either the left or right side of the seat 12. The sheet can be removed from the rectangular recess 24 to release the sheet from being fixed by the sheet fixing section (see FIGS. 8 and 9).

FIG. 6 is a partially enlarged sectional view taken along the line AA in FIG. 1 (hereinafter referred to as a connection sectional view of the rotary connection portion) in which the seat of Example 1 is placed at the center of the base. FIG. 7 is a partially enlarged sectional view taken along the line BB in FIG. 1 (hereinafter referred to as a connection sectional view of the seat fixing portion) in which the seat of Example 1 is placed at the center of the base.
As shown in the figure, at the center position of the base 14, the convex portion 32 and rectangular member 33 of the seat 12 fit into the center hole 24a and rectangular recess 24 of the base 14, restricting the free rotation of the seat 12 and fixing it facing forward. There is.

FIG. 8 is a connected cross-sectional view and a partially enlarged view of the rotary connection part in which the seat fixing part of the first embodiment is released. FIG. 9 is a connected sectional view and a partially enlarged view of the seat fixing part of the first embodiment after the seat fixing part is released.
When the lever of the operating member 34 is operated, the protrusion 32 and the rectangular member 33 move back from the bottom of the center hole 24a to the bottom of the rectangular recess 24, and the rectangular member 33 comes off from the rectangular recess 24 and is fixed to the seat fixing part. The fixation of the sheet 12 by 60 is released. The convex portion 32 is fitted into the center hole 24a, allowing the seat 12 to rotate freely. At this time, the convex portion 32 is in a downwardly biased state, and the opening periphery of the center hole 24a is chamfered or counter-bored and has an inclined shape, so even if it is eccentric for some reason during rotation, it will be maintained at the center of the center hole 24a. This makes rotation operation easier.

FIG. 10 is a connection sectional view 1 and a partially enlarged view of the rotary connection portion on which the seat slides according to the first embodiment. FIG. 11 is a connected sectional view 1 and a partially enlarged view of the seat fixing portion on which the seat slides according to the first embodiment.
As shown in the figure, when the sliding force, that is, the horizontal force, exceeds the tension force that urges the convex portion 32 downward when the sheet 12 is slid, the convex portion 32 changes to the inclined shape of the opening periphery of the center hole 24a. is pushed back.

FIG. 12 is a connection sectional view 2 and a partially enlarged view of the rotary connection portion on which the seat slides according to the first embodiment. FIG. 13 is a connected sectional view 2 and a partially enlarged view of the seat fixing portion on which the seat slides according to the first embodiment.
As shown in the figure, when a horizontal force is further applied to the sheet 12, the force in the biasing direction of the convex portion 32 is exceeded, the convex portion 32 comes off from the center hole 24a, and the sheet 12 slides within the T-groove 20. can. The seat 12 can be removed by sliding it to the left and right sides of the base 14.
On the contrary, when fixing the sheet 12 at the center position of the base 14, when the convex part 32 approaches the center hole 24a, the convex part 32 will be directed toward the center of the hole due to the inclined shape of the opening periphery of the center hole 24a. Be guided and get stuck. In this state, the user who supports the seat 12 in the semi-locked state has a clicking sensation, so that the user can easily return the seat 12 to the center position of the base 14.

[Example 2] Separate parts (rotating connection part 50 and seat fixing part 60)
FIG. 14 is an exploded perspective view of the child seat according to the second embodiment. FIG. 15 is a sectional view taken along line AA in FIG. 14. FIG. 16 is a sectional view taken along line BB in FIG. 14. FIG. 17 is a sectional view taken along the line CC in FIG. 14. FIG. 18 is a sectional view taken along line DD in FIG. 14.
As shown in the figure, the child seat 10A of the second embodiment includes a flanged disc 40 on the lower surface of the seat 12, a convex portion 32 protruding from the flanged disc 40, and a rectangular member 33A, and a T into which the flanged disc 40 fits on the upper surface of the base 14. The groove 20 is provided with a recess 25 and a rectangular recess 26 into which the protrusion 32 and the rectangular member 33A fit into the bottom surface of the T-groove 20. The convex portion 32 and the concave portion 25 are provided on the axis around which the seat 12 freely rotates on the base 14. The rectangular member 33A is provided on the front side of the seat 12 on a straight line passing through the convex portion 32 in the front-rear direction. The rectangular recesses 26 are provided on a straight line passing through the recess 25 in the front-rear direction, with the recess 25 in between. Although the recess 25 and the rectangular recess 26 are installed at a location where the seat 12 is in the center position with respect to the base 14, a plurality of the recesses 25 and the rectangular recess 26 may be arranged in parallel in the horizontal direction. The longitudinal direction of the rectangular member 33A is formed along the front-rear direction of the seat 12. Two operating levers serving as operating members 34 are arranged on the left and right side surfaces of the seat 12.

The rotary connection portion 50A of the second embodiment employs a fitting structure consisting of a convex portion 32 on the seat 12 side and a concave portion 25 on the base 14 side. The rotary connection portion 50A rotatably supports the seat 12 at a central position on the base 14. The convex portion 32 is a hemispherical member disposed on the rotation axis of the seat 12. The recess 25 is a hemispherical hole into which the protrusion 32 fits. The opening periphery of such a recess 25 has a spherical shape (FIGS. 15 and 16).

The seat fixing portion 60A of the second embodiment employs a fitting structure consisting of a rectangular member 33A on the seat 12 side and a rectangular recess 26 on the base 14 side. The seat fixing section 60A can fix the seat 12 at a central position on the base 14 facing the front or the back. The rectangular member 33A is a rectangular member extending from the convex portion 32 at a predetermined distance. The rectangular recess 26 is formed symmetrically along the front-rear direction with a predetermined spacing from the recess 25.
The convex portion 32 and the rectangular member 33A are biased from the lower surface of the sheet 12 by biasing means so as to protrude into the concave portion 25 and the rectangular concave portion 26 below (see FIGS. 17 and 18). The convex portion 32 and the rectangular member 33A can be removed from the rectangular recess 26 by lever operation of the operating member 34 on either the left or right side of the seat 12, and the seat 12 can be released from the seat fixing portion 60A.

FIG. 19 is a connected cross-sectional view and a partially enlarged view of the rotary connection portion in which the seat of Example 2 is arranged at the center of the base. FIG. 20 is a connected cross-sectional view and a partially enlarged view of the seat fixing part in which the seat of Example 2 is arranged at the center of the base.
As shown in the figure, at the center position of the base 14, the protrusion 32 and rectangular member 33A of the seat 12 fit into the recess 25 and rectangular recess 26 of the base 14, restricting the free rotation of the seat 12 and fixing it facing forward. .

FIG. 21 is a connected sectional view and a partially enlarged view of the seat fixing part of the second embodiment after the seat fixing part is released.
By operating the lever of the operating member 34, the rectangular member 33A is removed from the rectangular recess 26, and the seat is released from being fixed by the seat fixing section 60. Thereby, the convex portion 32 is in a state of being fitted into the concave portion 25, and the seat 12 can be freely rotated. At this time, the convex part 32 is in a state of being urged downward, and since the opening periphery of the concave part 25 is spherical, even if it is eccentric for some reason during rotation, it is held at the center of the concave part 25, making the rotation operation easy. Become.

FIG. 22 is a partially enlarged view of a connecting cross-sectional view 1 of a rotary connection portion on which a seat slides according to the second embodiment. FIG. 23 is a connected sectional view 1 and a partially enlarged view of the seat fixing portion on which the seat slides according to the second embodiment.
As shown in the figure, when the sliding force, that is, the horizontal force, exceeds the tension that urges the convex portion 32 downward when the sheet 12 is slid, the convex portion 32 changes to a spherical shape around the opening of the concave portion 25. being pushed back.

FIG. 24 is a connection sectional view 2 and a partially enlarged view of the rotary connection portion on which the seat slides according to the second embodiment. FIG. 25 is a connected sectional view 2 and a partially enlarged view of the seat fixing portion on which the seat slides according to the second embodiment.
As shown in the figure, when a horizontal force is further applied to the sheet 12, the force in the urging direction of the convex portion 32 is exceeded, the convex portion 32 comes off from the concave portion 25, and the sheet 12 can be slid within the T-groove 20. . The seat 12 can be removed by sliding it to the left and right sides of the base 14.
Conversely, when fixing the sheet 12 at the center position of the base 14, when the convex part 32 approaches the concave part 25, the convex part 32 is guided toward the center of the hole by the spherical shape of the opening periphery of the concave part 25. Get stuck in. In this state, the user who supports the seat 12 in the semi-locked state has a clicking sensation, so that the user can easily return the seat 12 to the center position of the base 14.

[Embodiment 3] Rotating connection portion 50 is concentric with the seat rotation axis FIG. 26 is an exploded perspective view of a child seat according to Embodiment 3. FIG. 27 is a sectional view taken along line AA in FIG. 26. FIG. 28 is a sectional view taken along line BB in FIG. 26. FIG. 29 is a sectional view taken along the line CC in FIG. 26. FIG. 30 is a sectional view taken along line DD in FIG. 14.
As shown in the figure, the child seat 10B of the third embodiment includes a flanged disk 40 on the lower surface of the seat 12, a convex portion 32B protruding from the flanged disk 40, and a rectangular member 33A, and a T into which the flanged disk 40 fits on the upper surface of the base 14. The groove 20 is provided with an annular recess 27 and a rectangular recess 26 into which the protrusion 32B and the rectangular member 33A fit into the bottom surface of the T-groove 20. The convex portion 32 and the annular recess 27 are provided concentrically with the axis around which the seat 12 freely rotates on the base 14. The rectangular member 33A and the rectangular recess 26 are provided on the rotation axis of the seat. The longitudinal direction of the rectangular member 33A is formed along the front-rear direction of the seat 12. Two operating levers serving as operating members 34 are arranged on the left and right side surfaces of the seat 12.

The rotary connection portion 50B of the third embodiment employs a fitting structure consisting of a pair of convex portions 32B on the seat 12 side and an annular recess 27 serving as a concave portion on the base 14 side. The rotation connecting portion 50B rotatably supports the seat 12 at the center position on the base 14 on a concentric circle of the rotation axis (rotation center). The convex portions 32B are hemispherical members disposed on a concentric circle of the rotation axis of the seat 12, and two convex portions 32B are provided on a straight line (on the diameter of the concentric circle) centering on the rotation axis. The annular recess 27 is a hemispherical hole that is concentric with the rotation axis of the seat 12 and into which the convex portion 32B fits. The annular recess 27 has a spherical opening periphery (see FIGS. 27 and 28).

The seat fixing portion 60B of the third embodiment employs a fitting structure consisting of a rectangular member 33A on the seat 12 side and a rectangular recess 26 on the base 14 side. The seat fixing section 60B can fix the seat 12 at a central position on the base 14 facing the front or the back. The rectangular member 33A is a rectangular member formed on the rotation axis of the seat 12 with its longitudinal direction extending along the front-rear direction. The rectangular recess 26 is formed at the center of the base 14 so that its longitudinal direction extends along the front-rear direction.
The convex portion 32B and the rectangular member 33A are urged by a biasing means from the lower surface of the sheet 12 so as to protrude into the annular recess 27 and the rectangular recess 26 below (see FIGS. 29 and 30). The convex portion 32B and the rectangular member 33A can be removed from the rectangular recess 26 by lever operation of the operating member 34 on either the left or right side of the seat 12, and the sheet 12 can be released from the seat fixing portion 60B.

FIG. 31 is a connected cross-sectional view and a partially enlarged view of the rotary connection portion in which the seat of Example 3 is arranged at the center of the base. FIG. 32 is a connected cross-sectional view and a partially enlarged view of the seat fixing part in which the seat of Example 3 is arranged at the center of the base.
As shown in the figure, at the center position of the base 14, the convex portion 32B and rectangular member 33A of the seat 12 fit into the annular recess 27 and rectangular recess 26 of the base 14, restricting the free rotation of the seat 12 and fixing it facing forward. There is.

FIG. 33 is a connected cross-sectional view and a partially enlarged view of the rotary connection section with the seat fixing section released in Example 3. FIG. 34 is a connected sectional view and a partially enlarged view of the seat fixing part of the third embodiment after the seat fixing part is released.

By operating the lever of the operating member 34, the rectangular member 33A is removed from the rectangular recess 26, and the seat is released from being fixed by the seat fixing portion 60B. Thereby, the convex portion 32B is in a state of being fitted into the annular recess 27, and the seat 12 can be freely rotated. At this time, the convex portion 32B is in a downwardly biased state, and since the opening periphery of the annular recess 27 has a spherical shape, even if it becomes eccentric for some reason during rotation, it will be held at the center of the center hole 24a and the rotation operation will not be possible. It becomes easier.

FIG. 35 is a partially enlarged view of a connection cross-sectional view 1 of a rotary connection portion on which a seat slides according to the third embodiment. FIG. 36 is a connected sectional view 1 and a partially enlarged view of the seat fixing portion on which the seat slides according to the third embodiment.
As shown in the figure, when the sliding force, that is, the horizontal force, exceeds the tension that urges the convex portion 32B downward when the sheet 12 is slid, the convex portion 32B changes to the inclined shape of the opening periphery of the annular recess 27. is pushed back.

FIG. 37 is a connection sectional view 2 and a partially enlarged view of the rotary connection portion on which the seat slides according to the third embodiment. FIG. 38 is a connected sectional view 2 and a partially enlarged view of the seat fixing portion on which the seat slides according to the third embodiment.
As shown in the figure, when a horizontal force is further applied to the sheet 12, the force in the urging direction of the convex portion 32B is exceeded, the convex portion 32B comes off from the annular recess 27, and the sheet 12 slides within the T-groove 20. can. The seat 12 can be removed by sliding it to the left and right sides of the base 14.
Conversely, when fixing the seat 12 at the center position of the base 14, when the convex portion 32B approaches the annular recess 27, the spherical shape of the opening periphery of the annular recess 27 causes the convex portion 32B to
is guided toward the center of the hole and fits into it. In this state, the user who supports the seat 12 in the semi-locked state has a clicking sensation, so that the user can easily return the seat 12 to the center position of the base 14.

[Example 4] Modification of Example 1 In the child seat 10 of Example 1, the seat 12 can be slid without lever operation. When the sheet 12 is returned from the slide position to the center position, the biased convex portion 32 is released from its contraction at the center position, expands, and can be fitted into the center hole 24a and fixed. At this time, there is a click feeling when the convex portion 32 fits into the center hole 24a, and the user can feel that the seat 12 is fixed at the center position. However, when trying to return to the center position from the slide position, the center position may be passed. In this case, it is conceivable to strengthen the bias of the convex portion 32 to strengthen the fitting when returning to the center position. However, in this case, there was a risk that the initial movement when sliding the seat 12 would be heavy. Therefore, the child seat of Example 4 is configured so that even if the bias of the convex portion 32 is weak (not strong), the seat 12 will not pass through the center position when it is returned from the slide position to the center position.
FIG. 39 is an explanatory view of the center hole 240a of the rotary connection portion of the fourth embodiment, and is an enlarged partial cross-sectional view taken along the line AA of the base. FIG. 40 is an explanatory diagram of the convex portion 320 of the rotational coupling portion of Example 4, and is an enlarged view of the convex portion.
The child seat of Example 4 has almost the same configuration as the child seat 10 of Example 1, but differs in the configuration of the rotating connection portion as shown in FIGS. 39 and 40. The other configurations are the same as in Example 1, and detailed description will be omitted.
The center hole 240a of the rotary connection portion 50C of the fourth embodiment is formed into an inclined shape by counterboring and chamfering the opening periphery as in the first embodiment, but the depth a of the inclined shape is equal to the depth a of the rectangular recess 24. It is formed at a position shallower than depth b. In other words, since the rectangular recess 24 and the rectangular member 33 protrude from the flanged disk 40 to the same depth, the depth a of the inclined shape is equal to the protruding amount of the rectangular member 33 from the flanged disk 40 (depth b ) is formed at a shallower position.
In addition, only a portion of the lower end (tip) of the convex portion 320 is chamfered. The specific location where the chamfer is formed is the location in the direction in which the seat 12 is desired to slide without operating a lever, and it is usually desirable to form the chamfer at the front of the seat 12. The other lower end of the convex portion 320, which has only a portion of its lower end chamfered, is not chamfered and has a cross section formed at a right angle.
The sliding operation of the child seat according to the fourth embodiment of the present invention having the above configuration will be explained below.
FIG. 41 is an overall view of the child seat when the seat is rotated 90 degrees to the left and an enlarged view of the rotating connection part. As shown in the figure, when the rectangular member 33 is removed from the rectangular recess by operating the lever of the operating member, rotation becomes possible, and the sheet 12 on the base 14 is rotated 90 degrees to the left. As shown in the enlarged view of the figure, the tip of the convex portion 320 is chamfered only in the direction in which the sheet 12 slides. No chamfer is formed at the tip of the convex portion 320 in directions other than the sliding direction. In this state, the seat 12 does not slide because the convex portion 320 fits into the center hole 240a.
FIG. 42 is an enlarged cross-sectional view of the rotary connection portion that slides the seat leftward from the center position. As shown in the figure, when the force in the direction of sliding the sheet 12 (arrow c) exceeds the biasing force of the protrusion 320, the protrusion 320 is pushed back upward (arrow d) by the inclined shape of the opening periphery of the center hole 240a. The seat 12 can be slid in the direction of arrow e.
FIG. 43 is an enlarged cross-sectional view of the rotary connection that slides the seat to the center position. When returning the sheet 12 from the slid position to the center position, when the convex part 320 approaches the center hole 240a (arrow f), the convex part 320, which had been contracted due to the inclined shape of the opening periphery of the center hole 240a, expands ( Arrow g) Guided toward the center of the center hole 240a and fixed at the center position. At this time, the opening periphery on the side opposite to the chamfer of the convex portion 320 is not chamfered, and the depth of the inclined shape of the opening periphery of the center hole 240a is shallower than the depth of the rectangular recess 24. Therefore, even if the convex portion 320 attempts to move in the opposite direction past the center hole 240a, the convex portion 320 will not run over the inclined shape of the center hole 240a, and will not pass the center position when the seat 12 is returned from the slide position to the center position. There is no.

According to the present invention, when the seat on which an infant is seated rotates and slides with respect to the base attached to the vehicle seat, it is possible to perform rotation and sliding motions with one operating member, and the number of parts of the operating member is reduced. can be reduced and the degree of freedom in design layout can be increased.
Note that the end of the convex portion on the lower surface of the seat of the rotary connecting portion may have a conical shape other than a cylindrical or hemispherical shape, and the concave portion on the upper surface of the base may have a shape into which a conical shape fits.
Furthermore, the end of the convex portion and the opening periphery of the concave portion may both be formed in an inclined or spherical shape as in Embodiments 2 and 3, or either one may be formed in an inclined or spherical shape. As in Example 1, the opening periphery of the recess (the protrusion is cylindrical) can be formed into an inclined shape. In addition, for example, the ends of the convex portions may be sloped or spherical, and the concave portions may be cylindrical.
The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
Further, the present invention is not limited to the combinations shown in the embodiments, but can be implemented by various combinations.

10 Child seat 12 Seat 14 Base 20 T-slot 24 Rectangular recess 24a, 240a Center hole 25 Recess 26 Rectangular recess 27 Annular recess 32, 32B, 320 Projection 33, 33A Rectangular member 34 Operating member 40 Flange disk 50, 50A, 50B, 50C Rotating connection part 60, 60A, 60B Seat fixing part

Claims (4)

A child seat comprising a seat on which an infant is seated, and a base that is attached to a vehicle seat and supports the seat so that it can rotate around an axis or slide so that the seat moves linearly,
a seat fixing part capable of fixing the seat at a central position of the base;
an operating member that releases the fixation of the seat fixing part;
a rotary connection part that can rotatably support the seat on the base when the seat fixing part is released from the seat fixing part by the operating member;
The rotary connection part has a structure in which a recess on the upper surface of the base and a projection on the lower surface of the seat fit together, the projection is biased toward the recess, and the end of the projection and the recess are connected to each other. A child seat characterized in that one or both of the peripheral edges of the opening are formed into an inclined or spherical shape. The child seat according to claim 1,
A child seat characterized in that the seat fixing part is provided integrally with the rotation connecting part. The child seat according to claim 1 or 2,
The child seat is characterized in that the rotational connection portion has an annular recess provided on the upper surface of the base and is arranged on a concentric circle around the rotation center of the seat. The child seat according to claim 2,
The concave portion of the rotary connecting portion has an opening peripheral edge that is inclined, the depth of the inclination is shallower than the depth of the rectangular concave portion of the seat fixing portion, and the convex portion is chamfered only at the end in the direction in which the seat slides. A child seat featuring

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