JP2001252147A - Hinge structure of seat back - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure if a pivot pin and a hinge hole, to facilitate machining the pivot and the hinge hole, to improve slip-off preventing function of the pivot pin, and to improve assembling workability of a seat back. SOLUTION: The pivot pin 47 having the head 49 formed with a large diameter is provided in a hinge bracket 35 if a seat cushion 12. A cutout recessed part 51 is provided in the head 49 of the pivot pin 47. The hinge hole 53 in which the head 49 of the pivot pin 47 can be fitted is formed in the hinge part 45 of the seat back 13. A projecting part 55 fitted to the cutout recessed part 51 of the head 49 of the pivot pin 47 is formed in the hinge hole 53. The hinge hole 53 and the head 49 of the pivot pin 47 are fitted only when the hinge part 45 of the seat back 13 is in a designated inclined state to the hinge bracket 35 of the seat cushion 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hinge structure of a seat back, and more specifically, to a hinge bracket provided on a seat cushion, a hinge portion of the seat back is pivotally supported by a pivot pin. The present invention relates to a seat back hinge structure which is supported and can be lowered on a seat cushion.

[0002]

2. Description of the Related Art Conventionally, as a hinge structure of a seat back, the structure of a pivot pin as a hinge pin and a hinge hole only allows the seat back to be moved forward, and this hinge pin is only inserted into the hinge hole. When an impact load is applied by a collision of a vehicle or the like, the seatback frame is bent, and there is a possibility that the hinge pin may come off from the hinge hole. For this reason, for example, as shown in Japanese Utility Model Publication No. 5-23075, a hinge in which a concave portion having a smaller diameter than the support portion is formed on the hinge pin and a stopper portion having a size larger than the concave portion and smaller than the support portion is formed. A structure has been proposed.

[0003]

However, in the conventional seat back hinge structure, the number of man-hours for processing the pivot pin as the hinge pin is increased, the structure is complicated, the workability of assembling the seat back is poor, and the pivot pin is poor. This has a drawback that the function of preventing slippage is insufficient and lacks economy.

An object of the present invention is to simplify the structure of a pivot pin and a hinge hole as a hinge pin, facilitate processing of the pivot pin and the hinge hole, improve the function of preventing the pivot pin from coming off, and improve the seat back. It is intended to provide a hinge structure of a seat back, which can improve the workability of assembling and improve the economy.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a hinge structure for a seat back according to a first aspect of the present invention has a hinge bracket provided on a seat cushion. The hinge portion of the seat back is pivotally supported by a pivot pin so that the seat back can be dropped on the seat cushion. A pivot pin having a diameter is provided, a notch recess is provided in the head of the pivot pin, and a hinge hole in which the head of the pivot pin can be fitted is formed in a hinge portion of the seat back. In addition, a convex portion that can be fitted into a cutout concave portion of the head of the pivot pin is formed in the hinge hole, and the hinge portion of the seat back is a hinge bracket of the seat cushion. Wherein the convex portion of the hinge hole only at a predetermined inclination state with respect to Tsu bets have been made so that it can fit into the notch recesses of the head of the pivot pin.

According to the hinge structure of the seat back according to the first aspect of the present invention, the hinge bracket of the seat cushion is provided with a pivot pin having a large diameter head, and the hinge pin is attached to the head of the pivot pin. A notch recess is provided to form a hinge hole into which the head of the pivot pin can be fitted in the hinge portion of the seat back, and the hinge hole is fitted in the notch recess of the head of the pivot pin. And a convex portion of the hinge hole fits into a cutout concave portion of the head of the pivot pin only when the hinge portion of the seat back is inclined at a predetermined angle with respect to the hinge bracket of the seat cushion. The head portion of the pivot pin can be inserted into the hinge hole only when the hinge portion of the seat back is inclined at a predetermined angle with respect to the hinge bracket of the seat cushion. The pivot pin can be pulled out only in the inclined state, the pivot pin cannot be pulled out at other positions, the function of preventing the pivot pin from coming off can be improved, and the workability of assembling the seat back is improved Can be done.

In the hinge structure for a seat back according to a second aspect of the present invention, the hinge bracket of the seat cushion is a center hinge bracket fixed to a rear frame of the seat cushion, and the heads of the pivot pins are left and right. It is characterized in that a pair is formed.

According to the hinge structure of the seat back according to the second aspect of the present invention, the hinge bracket of the seat cushion is a center hinge bracket fixed to the rear frame of the seat cushion, and the head of the pivot pin is Since a pair of left and right sides is formed, it can be used for a hinge structure of a pair of left and right seatbacks, the function of preventing the pivot pin from coming off can be improved, and the workability of assembling the seatback can be improved.

According to a third aspect of the present invention, in the hinge structure for a seat back, the convex portion of the hinge hole and the head of the pivot pin are located between the seating position of the seat back and the forwardly inclined operating position. It is characterized in that the cut-out recesses do not match.

According to the hinge structure of the seat back according to the third aspect of the present invention, the convex portion of the hinge hole and the notch of the head of the pivot pin are provided between the seating position of the seat back and the forwardly inclined operating position. Since the recesses do not coincide, the pivot pin cannot be pulled out between the seat back seating position and the forwardly inclined operating position, and the function of preventing the pivot pin from slipping out can be improved, and the seat back assembling workability can be improved. Can be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hinge structure for a seat back according to the present invention will be described below with reference to the drawings. 1 to 5
FIG. 3 shows an embodiment of a hinge structure of a seat back according to the present invention. As shown in FIG. 3, in this embodiment, the present invention is applied to a rear seat of a vehicle seat, but is limited to a rear seat. is not. Although the rear seat uses the flip-up seat 11 in the present embodiment, the rear seat is not limited to the flip-up seat 11.

The flip-up type seat 11 includes a seat cushion 12 provided on a floor panel 16 as a vehicle body body, on which an occupant sits, and a seat back 13 having a backrest function with respect to the seat cushion 12. I have. The seat back 13 can be provided so as to be able to tilt back and forth by a reclining device.

The flip-up type seat 11 is mounted on an RV vehicle such as a wagon or a minivan, and as shown in FIG. It is possible to effectively secure a space such as a room. A lock member 19 is provided at the upper rear end of the seat back 13 so as to be locked by being locked by an upper lock 18 provided on a side wall 17 of the vehicle body.

A rear lock 21 is provided on a floor panel 16 as a vehicle body facing the rear side of the bottom surface of the seat cushion 12, and the rear lock 21 is formed of a striker or the like. A lock member 23 that is stopped and locked is provided on the rear side of the bottom surface of the seat cushion 12.

As shown in FIG. 1, the seat cushion 12 of the flip-up type seat 11 includes a pair of left and right side hinge brackets 33 provided on the left and right sides of the cushion frame 31 and a rear frame 3 of the cushion frame 31.
A center hinge bracket 35 fixed to 1a is provided.

The seat back 13 has a pair of left and right seat back frames 37, and hinge brackets 39 on the outer sides of the pair of left and right seat back frames 37 are pivotally supported by the side hinge brackets 33 by bushes 41 and bolts 43, respectively. ing. The hinge brackets 45 on the inner side of the seat back frame 37 are pivotally supported by pivot pins 47 fixed to the center hinge bracket 35, respectively.

As shown in FIGS. 2 and 4, the center hinge bracket 35 has a pivot pin 47 having a large head 49 with a large diameter. 51 are provided. The head 49 of the pivot pin 47 is formed as a pair of left and right sides.

A hinge hole 53, into which a head 49 of the pivot pin 47 can be fitted, is formed in a hinge bracket 45 as a hinge portion on the inner side of the seat back frame 37 of the seat back 13. At 53, a projection 55 is formed which can be fitted into the cutout recess 51 of the head 49 of the pivot pin 47. The notch 51
The protrusions 55 are not limited to those shown, and are not limited to those provided as a pair.

The hinge hole 53 of the hinge bracket 45 as a hinge portion on the inner side of the seat back frame 37 of the seat back 13 and the head 49 of the pivot pin 47 of the center hinge bracket 35 of the seat cushion 12 are seat back. 13 are fitted only in a predetermined inclined state.

That is, the convex portion 55 of the hinge hole 53 can be fitted into the notched concave portion 51 of the head 49 of the pivot pin 47 when the seat back 13 is in a predetermined inclined state. For example, as shown in FIG. 5, the head 49 of the pivot pin 47 can be inserted into the hinge hole 53 only in the full reclining state, and therefore, only in a predetermined inclined state.
7 can be withdrawn and in other positions the pivot pin 4
7 cannot be pulled out, and the function of preventing the pivot pin 47 from coming off can be improved.

As shown in FIG. 3, between the seating position of the seat back 13 and the forwardly inclined operating position L, the projection 55 of the hinge hole 53 does not coincide with the cutout recess 51 of the head 49 of the pivot pin 47. Has been made. Therefore, the seat back 1
In the position L between the seated position 3 and the forward tilting operation position, the pivot pin 47
Cannot be pulled out, the function of preventing the pivot pin 47 from coming off can be improved, and the workability of assembling the seat back 13 can be improved.

[0022]

The above is an embodiment of the hinge structure of the seat back according to the present invention. According to the hinge structure of the seat back according to the first aspect of the present invention, the head bracket is attached to the hinge bracket of the seat cushion. Is provided with a pivot pin having a large diameter, a notch recess is provided in the head of the pivot pin, and a hinge hole in which the head of the pivot pin can be fitted in a hinge portion of the seat back. And a convex portion capable of being fitted into a notch concave portion of the head of the pivot pin is formed in the hinge hole, and the hinge portion of the seat back is inclined at a predetermined angle with respect to the hinge bracket of the seat cushion. The hinge portion of the seat back has a predetermined inclination with respect to the hinge bracket of the seat cushion because the projection of the hinge hole can be fitted into the cutout recess of the head of the pivot pin. The pivot pin head can be inserted into the hinge hole only at a predetermined angle, so that the pivot pin can be pulled out only in a predetermined inclined state, and at other positions, the pivot pin cannot be pulled out. The function of preventing the pins from coming off can be improved, and the workability of assembling the seat back can be improved.

Further, according to the hinge structure of the seat back according to the second aspect of the present invention, the hinge bracket of the seat cushion is a center hinge bracket fixed to a rear frame of the seat cushion, and the head of the pivot pin is provided. Since the left and right portions are formed as a pair, the pair of left and right portions can be used for the hinge structure of the pair of left and right seatbacks, and the function of preventing the pivot pin from coming off can be improved, and the workability of assembling the seatback can be improved. it can.

Further, according to the hinge structure of the seat back according to the third aspect of the present invention, the convex portion of the hinge hole and the head of the pivot pin between the seating position of the seat back and the forwardly inclined operating position. Since the notch recesses do not match, the pivot pin cannot be pulled out between the seating position of the seat back and the forwardly inclined operation position, and the function of preventing the pivot pin from coming off can be improved, and the seat back can be assembled. Workability can be improved.

According to the present invention, the structure of the pivot pin and the hinge hole as the hinge pin is simple, the processing of the pivot pin and the hinge hole is easy, and the function of preventing the pivot pin from coming off can be improved. Can be improved, and the hinge structure of the seat back which can improve the economic efficiency can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a seat frame having a hinge structure of a seat back according to the present invention.

FIG. 2 is a perspective view of a pivot pin and a hinge hole of the hinge structure of the seat back according to the present invention.

FIG. 3 is a side view showing a state in which the hinge structure of the seat back according to the present invention is applied to a flip-up seat.

FIG. 4 is an enlarged exploded perspective view of the hinge structure of the seat back according to the present invention.

FIG. 5 is a side view of the seat showing a state in which the head of the pivot pin and the hinge hole of the hinge structure of the seat back according to the present invention can be fitted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Jump-up type seat 12 Seat cushion 13 Seat back 15 Hinge part 16 Floor panel 18 Upper lock 19 Lock member 21 Rear lock 23 Lock member 31 Cushion frame 33 Side hinge bracket 35 Center hinge bracket 37 Seat back frame 39 Hinge bracket 43 Bolt 45 Hinge bracket 47 Pivot pin 49 Head 51 Notch recess 53 Hinge hole 55 Projection

Claims (3)

[Claims] 1. A seat back in which a hinge portion of a seat back is pivotally supported by a hinge pin provided on a hinge bracket provided on the seat cushion so as to be rotatable, and the seat back can be dropped onto the seat cushion. In the hinge structure of (1), a hinge pin having a large diameter is provided on a hinge bracket of the seat cushion, a notch recess is provided on the head of the pivot pin, and the hinge is provided on a hinge portion of the seat back. Forming a hinge hole into which the head of the pin can be fitted, and forming a convex portion into the notch recess of the head of the pivot pin in the hinge hole,
The convex portion of the hinge hole can be fitted into the cutout concave portion of the head of the pivot pin only when the hinge portion of the seat back is inclined at a predetermined angle with respect to the hinge bracket of the seat cushion. Features a seat back hinge structure. 2. The hinge according to claim 1, wherein the hinge bracket of the seat cushion is a center hinge bracket fixed to a rear frame of the seat cushion, and a pair of right and left heads of the pivot pin is formed. The hinge structure of the seat back described. 3. The projection of the hinge hole and the cutout of the head of the pivot pin do not coincide with each other between the seated position of the seat back and the forwardly inclined operation position. The hinge structure for a seat back according to claim 1 or 2.