JP3465359B2 - Seat rotation device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet rotating device capable of rotating a sheet.

[0002]

2. Description of the Related Art Rotating a passenger seat 180 degrees from the front to the rear is widely used with the spread of one-box cars. A seat rotation device for this purpose has an upper rail having a circular sliding portion that is in a fixed relationship with the seat cushion frame, and a circular sliding portion that is fixed to a floor member of the vehicle and is slidable with the sliding portion of the upper rail. The lower rails and the lock between both rails and the mechanism for releasing them are the basic constituent features. The basic constitutional requirements of such a rotating seat device are, for example, Japanese Utility Model Publication No. 63-130.
No. 65 and Japanese Utility Model Publication No. 1-40773.

In the rotary seat device, the lock mechanism is released, and the circular sliding portion of the upper rail is moved along the circular sliding portion of the lower rail by the human power of the occupant to make the seat rearward or forward. As long as the locking mechanism is used again, it is easy to handle, which is one of the factors contributing to its widespread use.

In the seat rotating device, the upper rail is slidable with respect to the lower rail.
The tubular body of the lower rail is inserted into the tubular body with the flange of the upper rail or the upper bracket fixed to the seat cushion frame, and both are held in a rotatable relationship. In the example of the latter publication, a ring-shaped stepped upper rail is fixed to a seat cushion frame, an outer peripheral edge of a circular lower rail is inserted into a stepped portion of the upper rail, and both are rotatably supported.

[0005]

In the former example, the tubular body of the upper rail is inserted into the tubular body of the lower rail, the two tubular bodies are centered, and the tubular body is fixed to the upper rail. In the latter example, the step portion of the upper rail is arranged on the outer peripheral edge of the circular lower rail, and in this state, the upper rail is riveted to the seat cushion frame. In such a conventional example, the center of rotation between the lower rail and the upper rail is adjusted in accordance with work experience and part alignment marks. However, there is a lot of misalignment, which hinders the smooth rotation of the seat, and the development of an automatic centering function is desired. Therefore, it is an object of the present invention to solve the above-mentioned problems of the conventional technology.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a ball is interposed between a lower rail and a bracket for fixing the upper rail to a seat cushion frame, and then the upper rail is fixed to the bracket. Use means.

Specifically, according to the present invention, a lower rail fixed to a floor-side member of a vehicle and a substantially U-shaped cross section slidably engaged with an annular sliding portion having a substantially inverted U-shaped cross section.
An upper rail having a V-shaped sliding portion and a bracket for fixing the upper rail to the seat cushion frame are provided, and a ball is interposed between the sliding portion of the lower rail and the bracket, and the sliding portion in contact with the ball. the outer wall surface and a down taper surface to the inside lower, blanking in contact with the ball
The racket part is a bend with the same diameter as the radius of the ball.
To provide a sheet rotary apparatus characterized by that.

It is preferable that the sliding parts of both rails are shoes.
To contact each other. Further, according to the present invention, the vehicle frame
It has a sliding part that is fixed to the lower member and has an inverted U-shaped cross section.
Fixed to the lower rail and seat cushion frame
And a bracket having a downward flange on the inside,
The taper is formed on the inner surface of the top of the sliding part of the lower rail.
Contact the inner surface of the inner surface of the bracket and the inner surface of the bracket
At the same time, a bow that automatically aligns the lower rail and the bracket
And a bracket that is self-aligned to the lower rail.
And is arranged in a sliding relationship with the sliding part of the lower rail.
Of the lower rail
The sliding relationship between the sliding part and the upper rail hook
To maintain the alignment between the bracket and the lower rail
A seat rotation device is provided.

[0009]

Operation: The bracket fixed to the seat cushion frame is set upward, and a plurality of balls are arranged at the inner corners thereof with a space. Next, place the lower rail on the bracket with the upper side facing upward as well, and use the taper surface of the lower rail and the bent surface of the bracket to roll the ball for self-alignment, or engage the upper rail with the shoe to engage the lower rail. After that, self-centering is performed, and after confirming that the upper rail smoothly rotates with respect to the lower rail, the upper rail is fixed to the bracket.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A seat rotating apparatus comprises a bracket 1 fixed to a seat cushion frame (not shown), an upper rail 3 having a sliding portion 2 having a substantially U-shaped cross section inside, and a sliding member having an inverted U-shaped cross section on the outer side. It includes a lower rail 5 having a moving part 4. The bracket 1 has an annular downward flange 6 on the inside.
And a downwardly facing flange 7 on its four sides. The curved surface 8 on the inner side of the downward flange 6 is a curved surface having a diameter substantially the same as the radius of the ball 9.

The upper rail 3 is a left-right symmetrical half body, and fixes four shoes 11 to the tip of the hook 10 of the sliding portion 2 at equal intervals. Sliding part 4 with a substantially inverted U-shaped cross section on the outer peripheral side
In the lower rail 5 having the above, the tapered surface 12 facing the lower part of the center of rotation (C) is provided inside the outer peripheral surface of the top portion of the sliding portion 4 at four positions at equal intervals in a suitable circumferential width. Lower rail 5
The base plate 13 of is fixed to a member on the vehicle floor side. The circumferential dimension of the tapered surface 12 is a range that allows the balls 9 to roll.

Assembly of the seat rotation device will be described.
Set the bracket 1 upwards on a jig (not shown),
The four balls 9 are arranged at designated positions inside the flange 6, and then the lower rail 5 is turned upward so that the taper surface 12 of the lower rail 5 is brought into rolling contact with the ball 9 so that the bracket 1
Place on top. When the lower rail 5 is rotated with respect to the bracket 1, the curved surface 8 and the tapered surface 12 move each ball 9 from the rotation center (C) to an equal radius position, and the lower rail 5 moves to the rotation center (C) of the bracket 1. The center of rotation is automatically aligned. Further, the shoe 11 of the sliding portion 2 of the upper rail 3
Is inserted into the groove 16 of the sliding portion 4 of the lower rail 5, and the lower rail 5, the upper rail 3, and the bracket 1 are temporarily placed in an upward state. Automatic alignment may be performed in this state. Attach the bracket 1 and the upper rail 3 to the bolt 14 and the nut 1.
5 is temporarily tightened, and it is confirmed that the center of rotation (C) of the lower rail 5 and the center of rotation (C) of the upper rail 3 match, and then the bolt 14 is fully tightened. Then, the lower rail 5 is fixed to the vehicle floor side member and the bracket 1 is fixed to the seat cushion frame.

[0013]

[Effect] In addition to automatically aligning the center of rotation (C) between the upper rail and the lower rail, the ball 9 interposed between the bracket 1 and the lower rail 5 has a play in both the horizontal and vertical directions. To prevent. There are many contact surfaces between the ball 9 and the bracket 1, and the tapered surface 12 is provided with a curvature surface having the same radius as the radius of the ball 9 to increase the contact surface with the ball 9, thereby reducing the local load and sliding. The surface durability can be increased. Further, a member for centering both of the rails and connecting the both is not necessary at the center of both rails.

[Brief description of drawings]

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

FIG. 2 is a sectional view of an embodiment of the present invention.

[Explanation of symbols]

1 bracket 2, 4 sliding part 3 Upper rail 5 Lower rail 8 curved surface 9 balls 11 shoe 12 Tapered surface 14 Volts

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60N 2/00-2/54 A47C 3/18

Claims (3)

(57) [Claims] 1. A lower rail fixed to a floor member of a vehicle, and a sliding portion having a substantially U-shaped cross section slidably engaged with an annular sliding portion having a substantially inverted U-shaped cross section. An upper rail having the same and a bracket for fixing the upper rail to the seat cushion frame are provided, a ball is interposed between a sliding portion of the lower rail and the bracket, and an outer wall surface of the sliding portion in contact with the ball is directed downward inward. The part of the bracket that comes into contact with the ball is approximately
A seat rotating device having a bend having the same diameter as the radius of the roll. 2. The seat rotating device according to claim 1, wherein the sliding portions of both rails are brought into contact with each other via shoes. 3. A cross section fixed to a floor member of a vehicle
Lower rail having a substantially U-shaped sliding part and fixed to the seat cushion frame and facing inward
Bracket with a flange and the taper formed on the inner surface of the top of the sliding part of the lower rail.
Contact the inner surface of the inner surface of the bracket and the inner surface of the bracket
At the same time, a bow that automatically aligns the lower rail and the bracket
And a bracket that is self-aligning to the lower rail.
In addition, a foot that is arranged in a sliding relationship with the sliding portion of the lower rail
And a lower rail sliding part
And the sliding relationship between the upper rail hook and the upper rail
To maintain the alignment between the racket and the lower rail.
A characteristic seat rotation device.