Rotating shaft structure

Abstract

To inhibit a shaft from being removed without using a removal prevention component in a structure in which a first member and a second member are rotatably connected by the shaft.SOLUTION: A rotary shaft structure includes: a shaft which rotatably connects a first member with a second member; a first bearing part which is provided at the first member and receives an axial end of the shaft inserted from the outside; a second bearing part which is provided at the second member and through which the shaft penetrates; and a restriction part which is provided at the first bearing part and contacts with an end surface opposite to an insertion direction of the shaft to restrict outward movement of the shaft.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present invention relates to a rotating shaft structure.

Background Art

[0002] Patent Document 1 discloses a technique for rotatably supporting a table and a main body with a shaft. In this Patent Document 1, nuts and stopper rings are used to prevent the shaft from coming off.

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 Patent Document 1, when assembling the shaft to the table and the main body, parts for preventing the shaft from coming off, such as nuts and stopper rings, are required.

[0005] An object of the present invention is to suppress the shaft from coming off without using parts for preventing the shaft from coming off in a configuration in which a first member and a second member are rotatably connected by a shaft.

Means for Solving the Problems

[0006] The rotating shaft structure according to the first aspect of the present invention includes a shaft that rotatably connects a first member and a second member, a first bearing portion provided in the first member that receives an axial end portion of the shaft inserted from the outside, a second bearing portion provided in the second member through which the shaft passes, and a restricting portion provided in the first bearing portion that contacts an end surface on the side opposite to the insertion direction of the shaft to restrict the outward movement of the shaft.

[0007] In the rotating shaft structure of the first aspect, in the rotating shaft structure, a limiting portion that restricts the outward movement of the shaft by contacting the end face on the side opposite to the insertion direction of the shaft is provided at the first bearing portion that receives the axial end portion of the shaft inserted from the outside. Therefore, even if an axial moving force acts on the shaft, the outward movement of the shaft is restricted because the end face on the side opposite to the insertion direction of the shaft contacts the limiting portion. Thus, in the above rotating shaft structure, it is possible to suppress the shaft from coming off the first bearing portion without using a retaining component for the shaft.

[0008] The rotating shaft structure of the second aspect of the present invention is the rotating shaft structure of the first aspect, wherein the first bearing portion includes a through portion through which the shaft penetrates from the outside and an arrangement portion having a larger inner diameter than the through portion, and the limiting portion is a stepped surface formed by the difference in inner diameter between the through portion and the arrangement portion.

[0009] In the rotating shaft structure of the second aspect, since the stepped surface formed by the difference in inner diameter between the through portion and the arrangement portion of the first bearing portion is used as the limiting portion, for example, compared with a configuration in which another component is attached to the first bearing portion to provide the limiting portion, it is possible to suppress the shaft from coming off the first bearing portion with a simple structure.

[0010] The rotating shaft structure of the third aspect of the present invention is the rotating shaft structure of the second aspect, wherein the stepped surface extends along the radial direction of the through portion.

[0011] In the rotating shaft structure of the third aspect, since the stepped surface is extended along the radial direction of the through portion, for example, compared with a configuration in which the stepped surface is inclined obliquely from the arrangement portion toward the through portion, it is possible to effectively suppress the shaft from coming off the first bearing portion.

[0012] The rotating shaft structure of the fourth aspect of the present invention is the rotating shaft structure of the second aspect or the third aspect, wherein in the arrangement portion, a receiving recess in which the shaft fits is formed when viewed in a cross section in a direction orthogonal to the central direction of the through portion, and the limiting portion is a stepped surface formed between the through portion and the receiving recess.

[0013] In the rotating shaft structure of the fourth aspect, when assembling the shaft to the first bearing portion, the shaft is passed through the through portion from the outside, and the passed-through shaft is disposed in the housing recess. Thereby, the end surface on the side opposite to the insertion direction of the shaft faces the stepped surface formed between the through portion and the housing recess, and the outward movement of the shaft is restricted. In this way, in the rotating shaft structure, the outward movement of the shaft can be restricted by a simple assembling operation.

[0014] The rotating shaft structure of the fifth aspect of the present invention is the rotating shaft structure of the fourth aspect, wherein the housing recess is curved in an arc shape.

[0015] In the rotating shaft structure of the fifth aspect, the housing recess is curved in an arc shape. Therefore, in the rotating shaft structure, the shaft fits well in the housing recess.

[0016] The rotating shaft structure of the sixth aspect of the present invention is the rotating shaft structure of the fourth aspect or the fifth aspect, wherein the shaft is pressed toward the housing recess by a pressing member.

[0017] In the rotating shaft structure of the sixth aspect, since the shaft is pressed toward the housing recess by the pressing member, the state in which the shaft fits in the housing recess is maintained. Thereby, in the rotating shaft structure, it is possible to more effectively suppress the shaft from coming off the first bearing portion.

[0018] The rotating shaft structure of the seventh aspect of the present invention is the rotating shaft structure of any one of the first aspect to the sixth aspect, wherein both axial ends of the shaft are respectively received by a pair of the first bearing portions.

[0019] In the rotating shaft structure of the seventh aspect, both axial ends of the shaft are respectively received by a pair of first bearing portions. Here, when assembling the shaft, since the shaft can be inserted from any of the pair of first bearing portions, the assembling operation of the shaft becomes easy.

[0020] The rotating shaft structure of the eighth aspect of the present invention is the rotating shaft structure of any one of the first to seventh aspects, wherein the first member is a base member attached to an object to be attached, and the second member is a table.

[0021] In the rotating shaft structure of the eighth aspect, the first member is used as a base member attached to an object to be attached, and the second member is used as a table. Here, since the table is repeatedly opened and closed with respect to the base member, an axial moving force easily acts on the shaft. However, by the axial end face of the shaft coming into contact with the restricting portion, the axial movement of the shaft can be restricted. That is, in the above rotating shaft structure, even when used for a member that is repeatedly opened and closed, it is possible to suppress the shaft from coming off from the first bearing portion.

[0022] The rotating shaft structure of the ninth aspect of the present invention is the rotating shaft structure of the eighth aspect, wherein the object to be attached is the seat back of a seat which is a vehicle interior part, and the base member is attached to the back surface of the seat back.

[0023] In the rotating shaft structure of the ninth aspect, the object to be attached to the base member is the seat back of a seat which is a vehicle interior part, and the base member is attached to the back surface of the seat back. Here, in the rotating shaft structure, even without using a retaining part for the shaft, it is possible to suppress the shaft from coming off from the first bearing portion. Therefore, by reducing the number of parts, the vehicle to which the table and the base member are attached can be lightened. By this weight reduction, the fuel efficiency of the vehicle can be improved.

Effects of the Invention

[0024] The present invention can suppress the shaft from coming off without using a retaining part in a configuration where the first member and the second member are rotatably connected by a shaft.

Brief Description of the Drawings

[0025]

Figure 1

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Figure 17

DETAILED DESCRIPTION OF THE INVENTION

[0026] Next, a table unit to which the rotating shaft structure according to an embodiment of the present invention is applied will be described with reference to FIGS. 1 to 12.

[0027] As shown in FIGS. 1 and 2, the table unit 20 of the present embodiment is attached to vehicle interior parts. Specifically, the table unit 20 is attached to parts that constitute the interior of an automobile as a vehicle. In the present embodiment, as an example, it is attached to the back surface 102A of the seat back 102 of the automobile seat 100. In the present embodiment, the table unit 20 is attached to the automobile seat 100, but the present invention is not limited to this configuration, and the table unit 20 of the present embodiment can be attached to a seat having a seat back (for example, an aircraft seat, a train seat, etc.). In FIGS. 1 and 2, the arrow W indicates the width direction of the seat 100 (hereinafter, appropriately referred to as the "seat width direction"). Further, the arrow U in FIGS. 1 and 2 indicates the upper side of the seat 100 (hereinafter, appropriately referred to as the "seat upper side"), and the arrow R indicates the rear side of the seat 100 (hereinafter, appropriately referred to as the "seat rear side").

[0028] As shown in FIGS. 1 to 6, the table unit 20 of the present embodiment includes a base member 30 as an example of a first member and a table 40 as an example of a second member. In FIGS. 1 and 2, the arrows W and U indicate the respective directions in a state where the table unit 20 is attached to the seat 100.

[0029] As shown in FIGS. 1 and 2, the base member 30 is a member attached to the back surface 102A of the seat back 102. This base member 30 is formed of a resin material (for example, plastic). Further, the base member 30 has a substantially long rectangular shape that is long in the seat width direction in plan view. This base member 30 is fastened and fixed to an attachment portion (not shown) provided on the back surface of the seat back 102 by a fixing member such as a screw or a fastener. Further, in a state where the base member 30 is attached to the attachment portion, the attachment portion is covered by the base member 30.

[0030] Further, a shaft 32 extending along the seat width direction is provided at the lower portion of the base member 30. Specifically, both axial ends of the shaft 32 are supported by bearing portions 33 provided on both sides in the width direction of the base member 30 (synonymous with the axial direction of the shaft 32). This shaft 32 is made of metal.

[0031] As shown in FIGS. 4 to 6, the table 40 is pivotally supported with respect to the base member 30 so as to be openable and closable. Specifically, the table 40 is pivotally supported by the shaft 32 of the base member 30 so as to be openable and closable. This table 40 is formed of a resin material (for example, plastic). Further, the table 40 has a substantially long rectangular shape that is long in the seat width direction. And the length of the table 40 is longer than the length of the base member 30. Here, the length of the table 40 refers to the length in the direction orthogonal to the seat width direction (hereinafter, appropriately referred to as the “lateral direction”) of the table 40 in plan view (hereinafter, appropriately referred to as the “longitudinal direction”), and is the length from the center of the shaft 32 to the tip of the table 40. Further, the length of the base member 30 refers to the length in the direction orthogonal to the seat width direction (lateral direction) of the base member 30 in plan view (longitudinal direction), and is the length from the center of the shaft 32 to the tip (upper end) of the base member 30.

[0032] Further, as shown in FIGS. 4 to 6, the table unit 20 of the present embodiment further includes a hinge mechanism 50. This hinge mechanism 50 is configured to be able to adjust the opening and closing positions of the table 40 with respect to the base member 30 in multiple stages. Further, the hinge mechanism 50 of the present embodiment is capable of holding the opening and closing positions of the table 40 with respect to the base member 30 at least at a storage position (see FIG. 4), a use position (see FIG. 5), and a forced opening position (see FIG. 6).

[0033] FIG. 4 shows a state in which the table 40 is in the storage position with respect to the base member 30. When the table 40 is in the storage position, the base member 30 is covered by the table 40 when viewed from the rear of the seat.

[0034] Further, in the present embodiment, as shown in FIG. 4, when the table 40 is in the storage position, the tip portion 40A of the table 40 is located above the seat more than when the table body is in the use position.

[0035] FIG. 5 shows a state in which the table 40 is in the use position with respect to the base member 30. The use position of the table 40 is a position where the opening and closing angle with respect to the base member 30 is larger than that in the storage position. When the table 40 is in the use position, when viewed from the seat width direction, the table 40 is substantially parallel to the horizontal direction. Specifically, when the table 40 is in the use position, in the normal upright state where the seat back 102 of the seat 100 is slightly tilted backward, when viewed from the seat width direction, the table 40 is substantially parallel to the horizontal direction. When the seat back 102 is tilted by the reclining mechanism, the horizontal state of the table 40 also varies according to the reclining angle.

[0036] FIG. 6 shows a state in which the table 40 is in the forced opening position with respect to the base member 30. The forced opening position of the table 40 is a position where the opening and closing angle with respect to the base member 30 is larger than that in the use position. When the table 40 is in the forced opening position, when viewed from the seat width direction, the tip portion 40A of the table 40 faces obliquely downward.

[0037] As shown in FIGS. 4 to 6, the hinge mechanism 50 includes a first cam body 52, a second cam body 54, and a coil spring 56 as an example of a biasing member.

[0038] As shown in FIGS. 4 to 6, the first cam body 52 is provided around a shaft 32 that pivotally supports the base member 30 and the table 40 on the base end portion 40B side of the table 40.

[0039] On the outer peripheral surface of the first cam body 52, a cam surface 52A that contacts the cam surface 54A of the second cam body 54 is formed. On this cam surface 52A, a first engaging portion 58, a second engaging portion 59, and a third engaging portion 60 are respectively provided along the outer periphery. These first engaging portion 58, second engaging portion 29, and third engaging portion 60 are portions that project the cam surface 52A (specifically, portions that project in a mountain shape).

[0040] As shown in FIGS. 4 to 6, the second cam body 54 is provided on the base member 30. Specifically, the base member 30 is provided with a cam case 34 that houses the second cam body 54, and the second cam body 54 is configured to be slidable within this cam case 34. The cavity 35 of the cam case 34 that houses the second cam body 54 extends in a direction orthogonal to the shaft 32, and a part of the second cam body 54 protrudes from the opening on the shaft 32 side, and a cam surface 54A is formed at the tip of the protruding portion. Note that the shape of the cavity 35 of the cam case 34 is such that the second cam body 54 can slide within the cavity 35. This second cam body 54 is biased by the coil spring 56 in a direction orthogonal to the shaft 32 and is pressed against the first cam body 52. Specifically, the second cam body 54 is biased so that the cam surface 54A is pressed against the cam surface 52A of the first cam body 52.

[0041] Further, an engaged portion 62 that can engage with the first engaging portions 58, 59, and 60 of the first cam body 52 is provided on the cam surface 54A of the second cam body 54. This engaged portion 62 is composed of an inclined surface 62A (a surface extending diagonally upward to the left in FIG. 4) formed on the front side of the sheet of the cam surface 54A and a flat surface 62B formed on the rear side of the sheet of the cam surface 54A and extending from the inclined surface 62A to the rear side of the sheet.

[0042] As shown in FIGS. 4 to 6, the coil spring 56 is provided on the base member 30. Specifically, the coil spring 56 is housed in the cavity 35 of the cam case 34 of the base member 30 and biases the second cam body 54 toward the shaft 32 in a direction perpendicular to the shaft 32. In this embodiment, a plurality (three) of coil springs 56 are housed in the cam case 34 side by side in the sheet width direction.

[0043] When the table 40 is in the storage position, as shown in FIG. 4, the first engaging portion 58 and the engaged portion 62 are engaged. Specifically, the flat surface 62B of the engaged portion 62 abuts against the curved top surface 58A of the first engaging portion 58, which is a mountain-shaped protruding portion, and in this state, the second cam body 54 is pressed against the first cam body 52 by the biasing force of the coil spring 56. In the state where the flat surface 62B is pressed against the top surface 58A in this way, the state where the table 40 is in the storage position is maintained by the biasing force of the coil spring 56. That is, the table 40 is held in the storage position.

[0044] When the table 40 is in the use position, as shown in FIG. 5, the second engaging portion 59 and the engaged portion 62 are engaged. Specifically, the inclined surface 62A of the engaged portion 62 is in contact with the inclined surface 59A of the second engaging portion 59 which is a mountain-shaped protruding portion. Further, in the present embodiment, the flat surface 62B is in contact with the portion 52B of the cam surface 52A located between the second engaging portion 59 and the first engaging portion 58 in the rotation direction of the first cam body 52. In that contact state, the second cam body 54 is pressed against the first cam body 52 by the biasing force of the coil spring 56. When the inclined surface 62A is pressed against the inclined surface 59A and the flat surface 62B is pressed against the portion 52B of the cam surface 52A in this way, the state where the table 40 is in the use position is maintained by the biasing force of the coil spring 56. That is, the table 40 is held in the use position.

[0045] When the table 40 is in the forced opening position, as shown in FIG. 6, the third engaging portion 60 and the engaged portion 62 are engaged. Specifically, the inclined surface 62A of the engaged portion 62 is in contact with the inclined surface 60A of the third engaging portion 60 which is a mountain-shaped protruding portion. Further, in the present embodiment, the flat surface 62B is in contact with the portion 52C of the cam surface 52A located between the third engaging portion 60 and the second engaging portion 59 in the rotation direction of the first cam body 52. In that contact state, the second cam body 54 is pressed against the first cam body 52 by the biasing force of the coil spring 56. When the inclined surface 62A is pressed against the inclined surface 60A and the flat surface 62B is pressed against the portion 52C of the cam surface 52A in this way, the state where the table 40 is in the forced opening position is maintained by the biasing force of the coil spring 56. That is, the table 40 is held in the forced opening position.

[0046] Further, in the present embodiment, the first cam body 52, the second cam body 54, the coil spring 56 and the cam case 34 are respectively provided on both ends of the shaft 32.

[0047] In addition, in the table unit 20 of the present embodiment, a cup holder 70 is provided between the base member 30 and the table 40. This cup holder 70 is pivotally supported by a shaft 32. Further, the cup holder 70 is configured to be covered by the table 40 when viewed from the rear of the seat when the table 40 is in the storage position. In the present embodiment, the cup holders 70 are provided on both axial sides of the shaft 32. Note that the present invention is not limited to this configuration, and the cup holder 70 may be provided only on one axial side of the shaft 32, or a plurality of cup holders 70 may be provided at intervals in the axial direction of the shaft 32.

[0048] Next, the rotation shaft structure of the present embodiment will be described. The rotation shaft structure of the present embodiment includes a shaft 32, a bearing portion 33 as an example of a first bearing portion, a bearing portion 42 as an example of a second bearing portion, and a restricting portion 80.

[0049] As described above, the shaft 32 is a member that rotatably connects the base member 30 and the table 40.

[0050] The bearing portions 33 are respectively provided at both end portions in the width direction of the base member 30 as described above. The bearing portion 33 is a portion that receives the axial end portion 32A of the shaft 32 and rotatably supports the shaft 32. Further, the shaft 32 can be inserted into the bearing portion 33 from the outside. Specifically, the bearing portion 33 includes a through portion 82 through which the shaft 32 passes from the outside, and an arrangement portion 84 having an inner diameter larger than that of the through portion 82. Specifically, in the arrangement portion 84, a housing recess 86 in which the shaft 32 fits is formed when viewed in a cross section in a direction orthogonal to the central direction of the through portion 82 (see FIGS. 7 to 12). As shown in FIGS. 11 and 12, the housing recess 86 is curved in an arc shape.

[0051] The bearing portions 42 are respectively provided at intermediate portions in the width direction of the table 40 (see FIG. 2). The bearing portion 42 is a portion of the table 40 through which the shaft 32 passes.

[0052] As shown in FIGS. 7 to 12, the restricting portion 80 is provided on the bearing portion 33. This restricting portion 80 is a portion that restricts the outward movement of the shaft 32 by contacting the end face 32B on the side opposite to the insertion direction of the shaft 32. Specifically, the restricting portion 80 is a stepped surface formed by the inner diameter difference between the through portion 82 and the arranging portion 84. This stepped surface extends along the radial direction of the through portion 82 and is a stepped surface formed between the through portion 82 and the accommodating recess 86.

[0053] Further, the shaft 32 is pressed toward the accommodating recess 86 by the second cam body 54 as an example of a pressing member. Specifically, the biasing force from the coil spring 56 acts on the shaft 32 via the second cam body 54 and the first cam body 52, and the state where the shaft 32 is accommodated in the accommodating recess 86 is maintained.

[0054] Next, the operation of this embodiment will be described. In the table unit 20 to which the rotating shaft structure of this embodiment is applied, a restricting portion 80 that restricts the outward movement of the shaft 32 by contacting the end face 32B on the side opposite to the insertion direction of the shaft 32 is provided on the bearing portion 33 that receives the axial end portion 32A of the shaft 32 inserted from the outside. For this reason, even when an axial moving force acts on the shaft 32, the outward movement of the shaft 32 is restricted because the end face 32B on the side opposite to the insertion direction of the shaft 32 contacts the restricting portion 80. In the table unit 20 to which the rotating shaft structure is applied in this way, it is possible to suppress the shaft 32 from coming off the bearing portion 33 without using a retaining component (for example, a nut or a stopper) for the shaft 32. Further, since no retaining component is used, the number of parts of the table unit 20 can be reduced. Furthermore, since the number of parts is reduced, the assembly work of the table unit 20 becomes easy and the time required for the assembly work is also shortened.

[0055] In addition, in the above table unit 20, since the stepped surface formed by the inner diameter difference between the through portion 82 and the placement portion 84 of the bearing portion 33 is used as the limiting portion 80, for example, compared with a configuration in which another component is attached to the bearing portion 33 to provide the limiting portion 80, the shaft 32 can be prevented from coming off the bearing portion 33 with a simple structure.

[0056] In addition, in the above table unit 20, since the stepped surface extends along the radial direction of the through portion 82, for example, compared with a configuration in which the stepped surface is inclined obliquely from the placement portion 84 toward the through portion 82, the shaft 32 can be effectively prevented from coming off the bearing portion 22.

[0057] In addition, when assembling the shaft 32 to the bearing portion 33 in the above table unit 20, the shaft 32 is passed through the through portion 82 from the outside, and the passed shaft 32 is disposed in the housing recess 86. Thereby, the end face 32B on the side opposite to the insertion direction of the shaft 32 faces the stepped surface formed between the through portion 82 and the housing recess 86, and the outward movement of the shaft 32 is restricted. In this way, in the table unit 20, the outward movement of the shaft 32 can be restricted with a simple assembling operation.

[0058] In addition, in the above table unit 20, the housing recess 86 is curved in an arc shape. For this reason, in the table unit 20, the shaft 32 fits well in the housing recess 86.

[0059] In addition, in the above table unit 20, since the shaft 32 is pressed toward the housing recess 86 by the second cam body 54, the state in which the shaft 32 fits in the housing recess 86 is maintained. Thereby, in the table unit 20, the shaft 32 can be more effectively prevented from coming off the bearing portion 33.

[0060] In the above-described table unit 20, both axial end portions 32A of the shaft 32 are respectively supported by a pair of bearing portions 33. Here, when assembling the shaft 32, the shaft 32 can be inserted from either of the pair of bearing portions 22, which facilitates the assembly work of the shaft 32. Among the pair of bearing portions 33, the end surface on the insertion direction side of the shaft 32 contacts the restricting portion 80 in the bearing portion 33 that pairs with the bearing portion 33 into which the shaft 32 is inserted. In this way, the axial movement of the shaft 32 is restricted by the respective restricting portions 80 of the pair of bearing portions 33. As a result, the shaft 32 is effectively prevented from coming off the bearing portion 33.

[0061] In the above-described table unit 20, since the table 40 is repeatedly opened and closed with respect to the base member 30, an axial moving force easily acts on the shaft 32. However, the axial movement of the shaft 32 can be restricted by the contact of the axial end surface 32B of the shaft 32 with the restricting portion 80.

[0062] In the above-described table unit 20, the attachment target of the base member 30 is the seat back 102 of the seat 100, which is a vehicle interior part, and the base member 30 is attached to the back surface 102A of the seat back 102. Here, in the table unit 20, even without using a retaining part for the shaft 32, the shaft 32 can be prevented from coming off the bearing portion 33. Therefore, by reducing the number of parts, the vehicle to which the table and the base member are attached can be lightened. This weight reduction can improve the fuel efficiency of the vehicle. That is, the present invention can contribute to environmental conservation by improving the fuel efficiency of both. In addition, a comfortable vehicle space can be created.

[0063] In the foregoing embodiment, bearing portions 33 are respectively provided at both widthwise end portions of the base member 30, but the present invention is not limited to this configuration. A bearing portion 33 may be provided at one widthwise end portion of the base member 30, and a bearing portion through which the shaft 32 cannot be inserted from the outside may be provided at the other end portion.

[0064] In the above-described embodiment, the restricting portion 80 is formed as a stepped surface formed by the inner diameter difference between the through portion 82 and the mounting portion 84. However, the present invention is not limited to this configuration. For example, a protruding portion may be provided between the through portion 82 and the mounting portion 84, and this protruding portion may be used as the restricting portion 88 (see FIGS. 13 and 14). Note that the restricting portion may be in the form of a rib or formed by a plurality of protrusions.

[0065] In the above-described embodiment, the bearing portions 33 having the restricting portions 80 are provided at both ends in the width direction of the base member 30. However, the present invention is not limited to this configuration. For example, the bearing portions 33 having the restricting portions 80 may be provided at both ends in the width direction of the table 40, and the bearing portion 42 may be provided at the middle portion in the width direction of the base member 30.

[0066] In the above-described embodiment, the configuration is such that the cup holder 70 is provided between the base member 30 and the table 40. However, the present invention is not limited to this configuration. For example, the cup holder 70 may be provided on the base member 30. Specifically, the cup holder 70 may be pivotally supported on the base member 30. Also, the cup holder 70 may be provided on the table 40. Specifically, the cup holder 70 may be pivotally supported on the table 40. Furthermore, instead of the cup holder 70, a cup stand (for example, an annular rib or a recess for supporting a cup) may be provided on the table 40.

[0067] Also, in the above-described embodiment, the base member 30 is provided with the cam case 34, the second cam body 54, and the coil spring 56, and the table 40 is provided with the first cam body 52. However, the present invention is not limited to this configuration. For example, the base member 30 may be provided with the first cam body 52, and the table 40 may be provided with the cam case 34, the second cam body 54, and the coil spring 56.

[0068] Furthermore, in the above-described embodiment, the table unit 20 is attached to the back surface 102A of the seat back 102 that supports the back of the seated person, but the present invention is not limited to this configuration. For example, it may be attached to the side surface of a seat cushion (not shown) on which the seated person is seated (the side surfaces on both sides in the seat width direction sandwiching the seating surface of the seat cushion). Specifically, the table unit 20 may be attached to the side surface of the seat cushion on the passenger seat side of the driver's seat. In this case, the base member 30 is attached to the side surface of the seat cushion so that the front-rear direction of the seat (synonymous with the front-rear direction of the vehicle) becomes the axial direction of the shaft 32. Note that the attachment direction of the base member 30 may be such that the shaft 32 is above the seat or below the seat with respect to the base member 30. Furthermore, the base member 30 of the table unit 20 may be attached to a door trim (inside of the door) of a vehicle door or the like.

[0069] Also, in the above-described embodiment, the rotation shaft structure is applied to the table unit 20, but the present invention is not limited to this configuration. For example, as shown in FIGS. 15 to 17, the rotation shaft structure may be used for the center console box 90. Specifically, a box 92 as an example of a first member and a lid 94 as an example of a second member are connected by a shaft 96 so as to be openable and closable. Here, a bearing portion 33 having a restricting portion 80 is provided in the box 92. Thereby, the axial movement of the shaft 96 is restricted, and the shaft 96 is prevented from coming off the center console box 90.

[0070] As described above, one embodiment of the present invention has been described. However, 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.

Explanation of Reference Numerals

[0071] 30 Base member (first member) 32 Shaft 33 Bearing portion (first bearing portion) 40 Table (second member) 42 Bearing portion (second bearing portion) 54 Second cam body (pressing member) 80 Limiting part 82 Through part 84 Arrangement part 86 Receiving recess 88 Limiting part 92 Box (first member) 94 Lid (second member) 96 Shaft 100 Sheet (object to be attached) 102 Seat back (vehicle interior part) 102A Back surface of seat back

Claims

1. A first bearing portion provided on both sides in the width direction of the first member, A second bearing portion provided on the second member and provided between the first bearing portions on both sides respectively, A shaft received by the first bearing portion and the second bearing portion respectively, and rotatably connecting the first member and the second member, Comprising, The first bearing portion, A through portion having an inner diameter into which the shaft can be inserted toward the second bearing portion, An arrangement portion provided on the second bearing portion side of the through portion, having a larger inner diameter than the through portion, and accommodating the end portion of the shaft, A limiting portion formed at the boundary between the arrangement portion and the through portion, and contacting the end portion of the shaft to limit the movement of the shaft into the through portion, A rotating shaft structure having.

2. The limiting portion is a stepped surface formed by the inner diameter difference between the through portion and the arrangement portion. The rotating shaft structure according to Claim 1.

3. The stepped surface extends along the radial direction of the through portion. The rotating shaft structure according to Claim 2.

4. In the arrangement portion, a receiving recess for accommodating the shaft is formed as seen in a cross section in a direction orthogonal to the central direction of the through portion, The limiting portion is a stepped surface formed between the through portion and the receiving recess. The rotating shaft structure according to Claim 2 or Claim 3.

5. The receiving recess is curved in an arc shape. The rotating shaft structure according to Claim 4.

6. The shaft is pressed toward the receiving recess by a pressing member. The rotating shaft structure according to Claim 4 or Claim 5.

7. The first member is a base member attached to an object to be attached, The second member is a table. The rotating shaft structure according to any one of Claims 1 to 6.

8. The object to be attached is the seat back of a seat which is an interior part of a vehicle, The base member is attached to the back surface of the seat back. The rotating shaft structure according to Claim 7.

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