JPH10338062A - Seat swiveling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain ricketiness of a seat at a position where it stops swiveling by a simple structure. SOLUTION: First brackets 10A-10D each having a U-cross section on one side are mounted in symmetry with respect to a rotation center O on the upper surface of a seat frame 5 secured to the floor, and second brackets 11A-11D which are engaged into openings in the first brackets 10A-10D from the rotating direction are mounted on the lower surface of a seat base 6 to which a seat cushion is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat rotating structure capable of suppressing rattling at a rotation stop position with a simple structure.

[0002]

2. Description of the Related Art As shown in FIG. 5, a vehicle seat, for example, a vehicle seat 1 used for a railway vehicle, a bus, or the like, comprises a seat cushion 2 and a seat back 3, and is fixed to a floor 4. A foot cushion 5 and a seat cushion 2
Is fixed so as to be horizontally rotatable, and the seat 1 is moved together with the seat base 6 in the forward position F.
And a rearward position B (see a two-dot chain line) at 180 degrees.

As shown in detail in FIG. 6, a turn unit 7 is mounted at a central position between the upper surface of the seat leg base 5 and the lower surface of the seat base 6. 6 is supported by the seat base 5 so as to be horizontally rotatable.

At positions on the upper surface of the seat pedestal 5 away from the turn unit 7, receiving members (retainers) 8,..., 8 for holding the lower surface of the seat base 6 are attached at four places. I have.

[0005]

However, since the seat base 6 has only the lower surface held by the receiving members 8 but not the upper surface, the rotation stop position of the front position F or the rear position B is not considered. When the back pressure of the person seated on the seat 1 acts on the seat back 3, the front portion of the seat cushion 2 is lifted up around the receiving member 8 'on the seat back 3 side as shown in FIG. There is a problem that the sheet 1 is likely to rattle in the vertical direction P together with the sheet base 6.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and has as its object to provide a seat rotating structure capable of suppressing rattling at a rotation stop position with a simple structure. is there.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a seat rotating structure in which a seat base on which a seat cushion is fixed is supported by a seat leg fixed to a floor so as to be horizontally rotatable. , A first bracket having a transversely U-shaped cross section is attached to one of the upper surface of the seat leg and the lower surface of the seat base corresponding to the predetermined rotation stop position of the seat base, respectively, at symmetrical positions about the center of rotation. In addition, the present invention provides a seat rotation structure in which second brackets that respectively engage with openings of the first brackets from the rotation direction are attached to the opening portions of the first brackets.

According to the present invention, when the seat base is rotated to the predetermined rotation stop position, the second bracket is engaged with the opening of the first bracket from the rotation direction, and the movement of each bracket in the vertical direction is restricted. Therefore, the seat is less likely to rattle in the vertical direction together with the seat base.

According to a second aspect of the present invention, a receiving guide portion which is open outward is formed at an end of the first bracket on the second bracket engaging side. The second bracket smoothly engages with the opening from the rotation direction.

According to a third aspect of the present invention, when each of the second brackets is provided with a resin retainer which is engaged with the opening of the first bracket, the flexibility of the resin retainer allows the first bracket to be mounted. The engagement gap with the opening can be reduced.

According to a fourth aspect, the first bracket and the second bracket are respectively mounted at symmetrical positions in two directions with respect to the center of rotation, and are symmetrical in the second direction with the respective brackets at the symmetrical position in the first direction. With each bracket of position,
With a configuration in which the distance from the rotation center is different, the movement of the seat base in the vertical direction is restricted by the four brackets at the four positions, so that the seat is less likely to rattle together with the seat base in the vertical direction. Further, since the brackets in the first direction and the second direction have different distances from the center of rotation, they do not interfere with each other during rotation of the seat base.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. Note that the same components and operations as those of the prior art are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 1, a vehicle seat, for example, a vehicle seat 1 used in a railway car, has a top surface of a seat base 5 fixed to a floor 4 in the same manner as in the prior art (see FIG. 5). By the turn unit 7 attached at a center position between the seat cushion 2 and the lower surface of the seat base 6 to which the seat cushion 2 is fixed, the seat 1 together with the seat base 6 allows the seat 1 to move forward.
And the rearward position B can be rotated horizontally by 180 degrees.

On the other hand, as shown in FIGS. 2 and 4, a first bracket 10 (A to D) having a laterally U-shaped cross section, and an opening 10a of the first bracket 10 (A to D) are provided in a horizontal rotation direction. A second bracket 11 (A to D) having a stepped cross section with which a lower end 11a can be engaged from Q is provided.

A resin retainer 12 is attached to a lower end 11a of each of the second brackets 11 (A to D), and each of the resin retainers 12 is attached to the first bracket 10 (A to D).
A small gap (for example, 0.1 to 0.2)
mm). The smaller the engagement gap, the more preferable.

Both ends of each of the first brackets 10 (A to D) face outward so as to serve as a guide when the resin retainer 12 is engaged with the opening 10 a from the end side in the horizontal rotation direction Q. Guide portions 10b, 1 opened like a trumpet
0b are respectively formed.

As shown in detail in FIG. 3A, two first brackets 10 (A, B) are provided on the upper surface of the seat base 5 in the first direction R of the rotation center O of the turn unit 7. At the symmetrical position separated by a distance T1 with the opening 10a facing the rotation center O, the two first brackets 10 (C, D) are further attached to the second center of the rotation center O of the turn unit 7. Direction S (in this example, first direction R
(At an angle of about 70 degrees) and at a symmetrical position separated by a distance T2 greater than the distance T1 with the opening 10a facing the rotation center O (T1 <T2).

As shown in detail in FIG. 3B, the two second brackets 11 (A, B) are provided at positions where the seat base 6 is turned forward or backward (position 180 degrees from the forward position F). ) Of the seat base 6 at the rotation stop position
In the lower surfaces of the horizontal frames 6a, 6a, the openings 10a, 10a of the opposing first brackets 10 (A, B) are located at symmetrical positions at a distance T1 in the first direction R of the rotation center O.
10a, each of the resin retainers 12, 12 has a horizontal rotation direction Q.
From each other.

Also, two second brackets 11 (C,
D), the first brackets 10 (C, D) opposed to each other at a symmetric position at a distance T2 in the second direction S of the rotation center O.
Each of the resin retainers 12, 1 is provided in each of the openings 10a, 10a.
2 are attached so that they engage from the horizontal rotation direction Q. Each of the second brackets 11 (A to D) is shown in FIG.
As shown in (1), since it has a stepped cross-section, it is slightly bent in the vertical direction P, so that it is possible to absorb a mounting error in the vertical direction P with each of the first brackets 10 (A to D).

The distances T1 and T2 correspond to the distance between the second brackets 11 (C, C) during the horizontal rotation of the seat base 6.
D) is set so as not to interfere with the first bracket 10 (A, B) at the distance T1. The first bracket 10 (A to D) and the second bracket 11 (A to D)
Can be attached at the same distance (for example, T1), but the second bracket 1
1 (A to D) are the first brackets 10 (A to
It is preferable to set the distances T1 and T2 to be different as described above, since they temporarily engage (interfere) with each other during the rotation of D) and become a resistance.

With the above-described rotating structure of the seat 1, when the seat 1 is rotated together with the seat base 6 to the rotation stop position at the forward position F or the backward position B, each of the first brackets 10 (A, B) and The second brackets 11 (A, B) and 11 (C, D)
Each of the resin retainers 12 of (C, D) is engaged from the horizontal rotation direction Q, and the movement of each of the second brackets 11 (A to D) in the vertical direction P is regulated. Is less likely to rattle in the vertical direction P.

In particular, since the movement of the seat base 6 in the vertical direction is regulated by the brackets 10 (A to D) and 11 (A to D) at the four symmetrical positions, the back and forth movement in the vertical direction P is suppressed. Almost gone. In addition, bracket 1 at each symmetric position
Since 0 (A to D) and 11 (A to D) have different distances T1 and T2 from the center of rotation, they do not interfere with each other during rotation of the seat base, so that rotation can be performed smoothly.

Further, since the receiving guide portion 10b is formed on the first bracket 10 (A to D), the opening portion 10a is formed.
In addition, the resin retainer 12 of the second bracket 11 (A to D) smoothly engages from the horizontal rotation direction Q, and the flexibility of the resin retainer 12 reduces the shock at the time of engagement.
Abnormal noise is less likely to occur, and the first
The bracket 10 (A to D) and the second bracket 11 (A to
D) is simply attached by welding or the like, so that the installation space is at least good.

In the above embodiment, the first brackets 10 (A to D) are attached to the seat base 5, and the second brackets 11 are attached to the respective lateral frames 6 a, 6 a of the seat base 6.
(A to D) are attached, but the second brackets 11 (A to D) are attached to the seat base 5, and the first brackets 10 (A to D) are attached to the horizontal frames 6a, 6a of the seat base 6. You may do it.

[0025]

As is clear from the above description, in the seat rotating structure of the present invention, when the seat base is rotated to the rotation stop position, the second bracket is engaged with the first bracket and each bracket is engaged. Since the movement of the sheet in the vertical direction is restricted, the sheet does not rattle in the vertical direction together with the sheet base, so that the quality of the sheet is improved. Also, since only the first bracket and the second bracket are mounted, the mounting space is small and compact, and the increase in weight is small.

When the receiving guide portion is formed on the first bracket, the second bracket can smoothly engage with the opening.

When the resin retainer is attached to the second bracket, the shock at the time of engagement is reduced due to the flexibility of the resin retainer, and the noise is less likely to be generated.
Further, the engagement gap between the first bracket and the opening can be reduced, so that the first bracket is less likely to rattle.

According to a fourth aspect, the first bracket and the second bracket
If the bracket and the bracket are mounted at symmetrical positions in two directions with respect to the center of rotation, the movement of the seat base in the vertical direction is restricted at four locations. If the distances are different, the first bracket and the second bracket do not interfere with each other during rotation of the seat base, so that the rotation is smooth.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a rotating structure of a vehicle seat according to the present invention.

FIG. 2 is a perspective view of a first bracket and a second bracket.

3A is a plan view of a state in which a first bracket is mounted, and FIG. 3B is a plan view of a state in which a second bracket is mounted.

FIG. 4 is a cross-sectional view of an engagement state between a first bracket and a second bracket.

FIG. 5 is a side view showing a front position and a rear position of the vehicle seat.

FIG. 6 is an exploded perspective view of a conventional vehicle seat rotating structure.

FIG. 7 is a side view of the seat showing a floating state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat cushion 4 Floor 5 Seat base 6 Seat base 6a Horizontal frame 7 Turn unit 10 (A-D) First bracket 10a Opening 10b Receiving guide part 11 (A-D) Second bracket 12 Resin retainer O Rotation center Q Horizontal rotation direction F, B Rotation stop position

Claims (4)

[Claims] 1. A seat rotation structure in which a seat base to which a seat cushion is fixed is horizontally rotatably supported by a seat leg base fixed to a floor, wherein the seat leg corresponding to a predetermined rotation stop position of the seat base. A first bracket having a laterally U-shaped cross section is attached to one of the upper surface of the table and the lower surface of the seat base at a symmetrical position about the center of rotation, and the other in the opening direction of the first bracket. A second bracket which engages with the second bracket. 2. The seat rotating structure according to claim 1, wherein a receiving guide portion that opens outward is formed at an end of the first bracket on the second bracket engaging side. 3. The rotating structure of a seat according to claim 1, wherein a resin retainer that engages with an opening of the first bracket is attached to each of the second brackets. 4. The first bracket and the second bracket are respectively mounted at symmetrical positions in two directions with respect to the center of rotation, and each bracket at a symmetrical position in the first direction and each bracket at a symmetrical position in the second direction. The seat rotation structure according to any one of claims 1 to 3, wherein a distance from the rotation center is different.