JPH074981Y2 - Rotating seat structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a rotating seat arranged in a passenger compartment of an automobile.

[0002]

2. Description of the Related Art Conventionally, a technique disclosed in Japanese Utility Model Laid-Open No. 64-56745 and shown in FIG. 3 has been proposed as a technique applicable to a rotating sheet. That is, the through hole 2 is provided at the center of the lower base 1, and the annular lower guide groove 3 centered on the through hole 2 is provided. On the other hand, the upper base 5 has the same structure as that of the lower base 1, and has a through hole 6 in the center thereof and an annular upper guide groove 7 centered on the through hole 6. The lower guide groove 3 and the upper guide groove 7 are both ring-shaped and have the same diameter, and the inner peripheral surfaces thereof are also formed in a semicircular cross section.

A plurality of spheres 4 are provided between the guide grooves 3 and 7.
And a collar 8 is interposed between the through holes 2 and 6, and the through holes 2 and 6 and the collar 8 are
A pin 10 having a head portion 9 at its lower end is inserted in a close state. Then, a presser foot 11 is screwed onto a male screw portion provided on the upper end of the pin 10, and a spacer 12 or the like is inserted between the presser foot 11 and the upper base 5 so that both bases 1 and 5 rotate relative to each other. It is fastened freely.

Therefore, by fixing the lower base 1 to the floor surface 13 of the vehicle body and fixing the seat cushion 14 on the upper base 5, the seat having the seat cushion 14 can be freely rotated. It is a thing.

[0005]

In such a conventional structure, the assembling can be carried out in the following first and second steps. That is, in the first order, first, the pin 10 is inserted into the through hole 2 of the lower base 1, the collar 8 is externally fitted to the pin 10, and the spherical body 4 is arranged in the lower guide groove 3. Subsequently, while inserting the through hole 6 of the upper base 5 into the upper end portion of the pin 10, the spherical body 4
The upper guide groove 7 is received in the upper part of the upper base 5 and the upper base 5 is placed on the spherical body 4. At this time, both the bases 1,
The positions of the through holes 2 and 6 formed in 5, and both guide grooves 3 and
If there is a molding error in the annular shape of 7, the upper guide groove 7 interferes with the spherical body 4 even if the pin 9 can be inserted into the through hole 5, and the spherical body 4 is received in the upper guide groove 7. There are cases where it is not possible.

In the second order, first, the collar 8 is placed on the lower base 1 and the lower guide groove 3 is placed.
The sphere 4 is placed on the sphere 4, the upper guide groove 7 is received in the upper part of the sphere 4, and the upper base 5 is placed on the sphere 4. Finally, the pin 10 is inserted into the through hole 2, the collar 8 and the through hole 6. At this time, if there is a molding error in the positions of the through holes 2 and 6 formed in the bases 1 and 5 and the annular shapes of the guide grooves 3 and 7 as described above, the spherical body 4
Cannot be received in the upper guide groove 7, or
Even if the spherical body 4 can be received in the upper guide groove 7, the through holes 2 and 6 of the upper base 5 do not coincide, and the pin 10 is inserted into the through hole 6.
There may be a case where the upper end of the can not be inserted. Therefore, in order to enable the assembling, the lower base 1 and the upper base 5 are required to have a high degree of forming accuracy, which causes a decrease in yield.

The inner peripheral surfaces of the guide grooves 3 and 7 are semicircular in cross section, and the spherical body 4 is in line contact with both guide grooves 3 and 7. For this reason, even if the assembly can be completed, when the lower guide groove 3 and the upper guide groove 7 are not formed into a circular ring of a perfect circle having the same diameter,
In other words, if there is a molding error in both guide grooves 3 and 7, when both bases 1 and 5 are rotated relative to each other, the sliding resistance of sphere 4 increases between both guide grooves 3 and 7, and the seat smoothes. Rotating operability is hindered.

Therefore, the assembling work is made possible, and
In order to ensure smooth rotational operability of the sheet, a high degree of forming precision is required when forming the lower base 1 and the upper base 5.

The present invention has been made in view of such conventional problems, and enables assembly and smooth rotation of a sheet even if there is a molding error without requiring a high molding precision. It is an object of the present invention to provide a rotating seat structure designed to ensure flexibility.

[0010]

In order to solve the above problems, in the present invention, through holes are provided in the central portions of the lower base fixed to the floor surface side and the upper base fixed to the seat lower surface side. , A ring-shaped guide groove centered on the through hole is formed in one of the bases, a plurality of spheres are arranged in the guide groove, and the other base is placed on the sphere, In a rotating seat in which a shaft member is inserted into both through holes to allow the two bases to rotate relative to each other, a taper portion that is inclined in the central axis direction of the through hole and abuts on the spherical body is formed in the other base, At least one of the through holes provided in both bases is formed into a large diameter so as to form a gap with the shaft member, and a sandwiching member that presses both bases in a direction close to each other via the shaft member. Pressure means are provided.

[0011]

In the above construction, for example, in the structure in which the guide groove is formed in the lower base and the taper portion is formed in the upper base, the guide groove formed in the lower base is first assembled in the assembling. A plurality of spheres are rotatably arranged in. After that, the tapered portion is brought into contact with the spherical body, the upper base is arranged so as to face the lower base, and the shaft member is inserted into the through holes formed in both bases. At this time, since the upper base is only in point contact with the spherical body in the tapered portion, it can be freely moved, and there is a molding error in the positions of the through holes provided in both bases. Also,
The shaft member can be inserted with both through holes aligned with each other without any trouble.

When the bases are pressed by the pressing means in the direction of being close to each other via the shaft member, the upper base is pressed downward at the central part, so that the tapered parts are in the same pressure contact with each spherical body. As a result, the upper base is displaced within the range of the gap and positioned in parallel with the lower base, and the centers of rotation of the upper base are aligned with each other.

When the upper base fixed to the lower surface of the seat is rotated together with the seat after the assembly is completed,
In the tapered portion, the upper base rotates while making point contact with the spherical body, so that even if there is a molding error in both bases, an increase in sliding resistance is suppressed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. That is, as shown in FIGS.
A pair of seat sliders 21 and 21 are arranged in parallel on the floor surface 20, and the seat sliders 21 and 21 are mounted on the floor surface 20.
The lower rail 22 fixed to the lower rail 22 and the upper rail 23 slidably fitted to the lower rail 22. A lower base 24 is fixed to the upper rails 23 via legs 25 that are vertically provided at four corners of the lower base 24. The lower base 24 has a substantially square shape, and a through hole 26 is provided at the center of the lower base 24.
An annular guide groove 27 centered at is provided,
The inner peripheral surface of the guide groove 27 is formed in a semicircular cross section.

An annular ball retainer 28 along the guide groove 26 is placed on the lower base 25, and the ball retainer 28 is provided with three intermittent holes 29 at equal intervals. . Spheres 30 ... Are loosely fitted in the respective intermittent holes 29, whereby the spheres 30.
.. are rotatably accommodated in the guide groove 27 while their positions are regulated.

An upper base 31 is placed on the spheres 30 ... And the upper base 31 is formed in a substantially square shape like the lower base 24. A through hole 32 is provided at the center of the upper base 31, and an annular taper portion 33 centering on the through hole 32 is formed. The tapered portion 33 is a peripheral surface of an inverted cone whose apex is on the central axis of the through hole 32, and the spherical body 30 is in contact with the lower surface thereof.

A pin 34 as a shaft member is inserted through the through holes 26 and 32 of the lower base 24 and the upper base 31, and the upper end portion of the pin 34 has a through hole 32 on the upper base 31. Head 3 facing the circumference
5 is molded. Further, a male screw portion 36 is formed at the lower end portion of the pin 34, and the spring washer 3 that constitutes a pinching means together with the head portion 35 is formed on the male screw portion 36.
7, a plain washer 38 is fitted and a nut 39 which also constitutes a pinching means is screwed.

Further, a seat cushion 40 of an automobile seat is fixed on the lower surface of the upper base 31, and a seat back (not shown) is pivotally supported at the rear portion of the seat cushion 40. In the present embodiment, the through hole 2 formed in both bases 24 and 31.
6 and 32 are formed in large diameter so that gaps a and b can be formed between the pins 6 and 32, respectively.

In this embodiment having the above-described structure, the ball retainer 28 is placed on the lower base 24 and the spherical body 30 is placed in the intermittent hole 29 during assembly.
To place. Furthermore, the tapered portion 33 is attached to the spherical body 30.
Are brought into contact with each other to dispose the upper base 31 on the lower base 30 so as to face each other, and then the pin 34 is inserted into the through holes 26 and 33 formed in both the bases 24 and 31. At this time, since the upper base 31 is only in point contact with the spherical body 30 at the tapered portion 33, the upper base 31 can freely move on the spherical body 30. Moreover,
Since both through-holes 26 and 32 are formed in a large-diameter shape capable of forming the above-mentioned gaps a and b, even if there is an error in the forming position of both through-holes 26 and 32, both through-holes will not interfere. 26 and 32 are aligned and the pin 3 is inserted in both through holes 26 and 32.
4 can be inserted.

After inserting the pin 34, the spring washer 37 and the plain washer 3 are inserted.
8 is loosely fitted in the male screw portion 36, and a nut 39 is screwed into the male screw portion 36. As a result, the spring washer 37 is pressed against the lower surface of the lower base 30, while the head portion 35 is pressed against the upper surface of the upper base 31.
0 and 31 are pinched in the directions close to each other. Therefore,
The upper base 31 is pressed downward at the substantially central portion,
As a result, the upper base 31 has a tapered portion 33 in the peripheral portion.
The spheres 30 are pressed against each other at the same height position with the same pressing force. As a result, the upper base 31 and the lower base 24 are relatively displaced within the range of the gaps a and b, and the upper base 31 is positioned in parallel with the lower base 24.
The centers of rotation of both match.

Then, in this state, the seat cushion 40
The upper base 31 fixed to the seat cushion 40
When rotated together, the upper base 31 has the tapered portion 3
3, the balls rotate while making point contact with each sphere 30. Therefore, even if there is a molding error in each part of the upper base 31 and the lower base 24, the upper guide groove 7 is also formed on the upper base 5 side as in the conventional structure shown in FIG. The sliding resistance does not increase significantly as in the case where the spherical bodies 4 are in line contact with each other. Therefore, the increase of the sliding resistance in the presence of a molding error is suppressed, and the smooth seat rotation is achieved. It is possible to ensure operability.

In the above embodiment, the through holes 26 formed in the lower base 24 and the upper base 31,
Although both 32 have a large diameter, one of the through holes 2
Even when only 6 and 32 have a large diameter, the upper base 31 and the lower base 24 are relatively displaced within the range of the gap so that the upper base 31 is parallel to the lower base 24. It is possible to position with, and the rotation centers of both can be matched. Further, in this embodiment, the guide groove 7 is provided on the lower base 24 side, and the taper portion 33 is provided on the upper base 31 side. On the contrary, the taper portion 33 is provided on the lower base 24 side. Guide groove 2 on the 31 side
The configuration in which 6 is provided may be adopted.

[0023]

As described above, according to the present invention, one of the through holes provided in the lower base and the upper base has a large diameter, and one of the bases has a guide groove for locating the spherical body. It was molded, and the other base was formed with a tapered portion that abuts against the sphere. Therefore,
Even if there is a molding error in each part of both bases, it is possible to assemble without any trouble, which allows
The yield at the time of molding the component parts can be improved. Further, since the base having the tapered portion is only in point contact with the spherical body, even if there is a molding error, the sliding resistance is suppressed from increasing and the smooth seat rotation operation is performed. It is possible to secure the smoothness of the seat, and thereby, it becomes possible to obtain the smooth rotatability of the seat without requiring a high precision of molding the parts.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the same embodiment taken along the line AA in FIG.

FIG. 3 is a cross-sectional view of a conventional device.

[Explanation of symbols]

 20 Floor Surface 24 Lower Base 26 Through Hole 27 Guide Groove 30 Sphere 31 Upper Base 32 Through Hole 33 Tapered Part 34 Pin (Shaft Member) 35 Head (Clamping Means) 37 Spring Washer (Clamping Means) 38 Plain Washer (Clamping Force) Means) 39 nut (pressing means) 40 seat cushion

Front page continuation (72) Inventor Isamu Suzuki 665-4 Toyota Utaki, Hiratsuka City, Kanagawa Prefecture (72) Inventor Yoshihiko Yamauchi 3-1-2-6-112 Teronaka, Ayase City, Kanagawa Prefecture

Claims (1)

[Scope of utility model registration request] 1. A through hole is provided in the center of each of a lower base fixed to the floor surface side and an upper base fixed to the seat lower surface side, and one of the bases has an annular shape centered on the through hole. A guide groove is formed, a plurality of spheres are arranged in the guide groove, the other base is placed on the sphere, and a shaft member is inserted into the both through holes so that the both bases are relatively rotatable. In the rotating seat, the other base is formed with a taper portion that is inclined in the direction of the central axis of the through hole and is in contact with the sphere, and at least one of the through holes provided in the both bases is formed with the shaft member. A rotating seat structure, characterized in that it is formed into a large diameter capable of forming a gap therebetween and is provided with a pinching means for pinching both bases in a direction in which they are close to each other via the shaft member.