JP3465360B2 - 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 rotation device, in addition to the basic structure described above, a seat belt is added to a seat cushion frame or an upper rail for the safety of passengers. In the above-mentioned Japanese Utility Model Publication No. 63-13065, a substantially triangular reinforcing portion that extends laterally outward is formed on both left and right sides of a turn bracket corresponding to an upper rail fixed to a seat cushion frame.
A seat belt anchor is bolted to this reinforcing portion.
In another example, Japanese Utility Model Publication No. 1-40773, a seat belt anchor is bolted to a pipe extending to the left and right of a rear portion of a seat cushion frame via a bracket.

[0005]

In the example disclosed in the former publication, the reinforcing portion extending laterally enlarges the upper rail and consumes space. In the latter publication, the reinforcing member is attached to the pipe. It is necessary to weld and prevent upward deformation of the central part of the pipe when a large load is applied to the seat belt, and this reinforcing member impairs the comfort of the seat cushion. Therefore, it is an object of the present invention to solve the above-mentioned problems of the conventional technology.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention basically fixes the front and rear frames of the seat cushion frame to the upper side member of the rail assembly, and both side frames and front frames. Using a technical means of connecting with a reinforcing leg member.

Specifically, the present invention relates to a seat cushion frame in which a seat cushion frame including front and rear frames and both side frames is fixed to an upper member of a rail assembly having a sliding portion of a circular track. Is equipped with a reinforcing member for connecting the front frame and each side frame, and the front and rear frames of the seat cushion frame having the seat belt anchor attachment portion at the side end thereof are fixed to the upper side member of the rail assembly ,
The fixing point between the strong member and the front frame is the seat cushion frame
Match or come close to the fixed point with the rail assembly, and the fixed point
Rear frame of the seat cushion frame and rail assembly behind
Provided is a seat rotation device having a fixed point with a body .

Preferably, the rail assembly has an annular sliding portion at its center.

[0009]

The reinforcing member that connects the front frame of the seat cushion frame and the side frames together divides the seat cushion frame into triangular shapes on both sides of the upper side member of the rail assembly. When a load acts to lift the rear frame diagonally upward via the seat belt as in the case of a collision, this load is dispersed in the above-described triangle, and the peeling load between the upper rail and the lower rail is minimized.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A seat cushion frame 1 which constitutes a seat rotation device includes a front frame 2, side frames 3, 3, a rear frame 4,
It has a central connecting member 5 and reinforcing members 6, 6 for connecting the front frame 2 and the side frames 3, 3. Seat cushion frame 1
Is made of steel mold material, pipe, or aluminum alloy extruded mold material. The side frames 3 and 3 have a substantially U-shaped cross section having inwardly facing flanges 7 and 7, and the end faces of the pipe-shaped rear frame 4 are brought into contact with the rear parts to weld them together.
The front portions of the side frames 3 and 3 are bent inward by approximately 90 degrees, and the end faces of the front frame 2 having a substantially U-shaped cross section are welded to the end faces. Both ends of the rear frame 4 are seat belt anchor attachment portions 8. 9 is a seat cushion attachment portion (not shown).

The reinforcing member 6 has its front end welded to the lateral portion of the front frame 2 and its rear end welded to the bracket 7. As a result, a triangular portion A is formed between the side frames 3 and 3, the reinforcing members 6 and 6, and the front frame 2.

The seat rotating device further includes a rail assembly 10. The rail assembly 10 has a sliding portion 11 at the edge of the hole in the center thereof. The annular sliding portion 11 serves as an annular sliding portion between the upper rail and the lower rail. The front corner of the rail assembly 10 is bolted to the reinforcing members 6, 6 and the front frame 2 at or near the fixing point. The rear corner portion of the rail assembly 10 is bolted to the bracket 12 of the rear frame 4 at a position behind the fixing point. As a result, when the rail assembly 10 is bolted to the seat cushion frame 1, a triangular portion B is formed between the side cushions 3 and 3.

At the time of a vehicle collision, an external force acts diagonally upward on the rear frame 4 via the seatbelt anchor mounting portion 8. The forward and diagonal upward component forces of this external force are triangular portions A,
It is dispersed by the members constituting B, and in particular, the reinforcing members 6, 6
Absorbs this external force. Therefore, the force for separating the upper rail of the rail assembly from the lower rail can be minimized.

[0014]

According to the present invention, since only the reinforcing member is mounted in the frame of the seat cushion frame, the peeling load on the rail assembly can be reduced without increasing the size of the frame.

[Brief description of drawings]

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

FIG. 2 is a partial perspective view around a reinforcing member.

[Explanation of symbols]

1 seat cushion frame 2 front frame 3,3 side frame 4 rear frame 6 Reinforcement member 8 Seatbelt anchor mounting part 10 Rail assembly 11 Sliding part

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60N 2/14-2/14 A47C 3/18

Claims (2)

(57) [Claims] 1. In a seat rotating device for fixing an upper side member of a rail assembly having a circular track sliding portion to a seat cushion frame including front and rear frames and both side frames, the seat cushion frame has its front frame and each side. A front and rear frame of a seat cushion frame having a reinforcing member for connecting the frame and a seat belt anchor attachment portion at its side end is fixed to an upper side member of the rail assembly to fix the reinforcing member and the front frame.
The points fix the seat cushion frame and rail assembly
Match or close to the point and seat cushion behind the fixed point
Seat rotation device having fixed points between the rear frame of the frame and the rail assembly . 2. The seat rotating device according to claim 1, wherein the rail assembly has an annular sliding portion at the center .