JP2550412Y2 - Reclining seat - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reclining seat in which a seat cushion and a seat back are assembled so as to be rotatable in the front-rear direction, and the inclination angle of the seat back in the front-rear direction can be adjusted.

[0002]

2. Description of the Related Art As shown in FIG. 4, a seat cushion 31 and a seat back 30 having a lower end attached to a rear end portion of the seat cushion 31 by a reclining adjuster 33 so as to be rotatable in the front-rear direction. Such a reclining seat has been generally known in the past. The seat belt 32 is attached to the reclining seat at a back-side fixing point 34 and a cushion-side fixing point 35.

[0003]

By the way, in the event of a forward vehicle collision, a large load (approximately 1.6 tons) is applied to the seat belt 32 because the body of the occupant sitting on the reclining seat tends to move forward. , Seat belt 3
2, a large tension T is generated. Since most of the tension T acts on the back-side fixing point 34, the bending moment M applied to the reclining adjuster 33 has a length of 1 between the reclining adjuster 33 and the back-side fixing point 34, and the seat back 30 and the seatbelt. If the angle made by 32 is θ, M = Tcos (90−θ) × l, and in order to withstand this moment, it was necessary to use a very high strength reclining adjuster 33 conventionally. Also, the seat back frame 30
a also needed to have sufficient strength to withstand the impact.
Therefore, the present invention is directed to a fixing point 3 on the back side of the seat belt 32.
4 effectively transmits the load applied to the cushion side to prevent a large bending moment from being applied to the conventional seat back frame 30a and the reclining adjuster 33, thereby simplifying and reducing the weight of the seat back frame 30a and the reclining adjuster 33. It is.

[0004]

In order to achieve the above object, a reclining seat according to the present invention is provided with a seat back having a lower end mounted to a rear end of a seat cushion so as to be rotatable in a front and rear direction. Adopting a connection mechanism having a self-length expansion and contraction function as an adjustable support reclining adjuster, each end of this connection mechanism is rotatably connected to an intermediate portion between each side of the seat cushion and the seat back. It is characterized by the following. A turnbuckle is adopted as the coupling mechanism, and a tip rod portion provided on one of a pair of shafts which are screwed coaxially with a nut constituting the turnbuckle is axially inserted into a tip tube portion provided on the other. And the two shafts are coaxially supported with each other.

[0005]

[Function and effect of the invention] By adopting the connecting mechanism having the function of extending and contracting the self-length as a reclining adjuster and suspending and connecting the connecting mechanism to the seat cushion and the seat back, in the event of a vehicle collision, etc. The load applied to the back-side fixing point of the seat belt can be effectively transmitted to the cushion side via the connection mechanism, and the occurrence of a large bending moment applied to the conventional seat back frame or reclining adjuster can be suppressed. Further, the connecting mechanism of the present invention can adjust the inclination angle of the reclining seat in the front-rear direction without using the conventional reclining adjuster in which the seat back and the seat cushion are rotatably assembled. So
By employing this connection mechanism, the conventional reclining adjuster can be made a hinge portion having no function of adjusting the angle of the seat back. Therefore, according to the present invention, the conventional seat back frame and reclining adjuster can be reduced in weight and simplification, and the cost of these members can be reduced.

When a turn buckle is used as a connecting mechanism having a self-length extending / contracting function, a tip rod portion provided at a tip portion of one shaft in a nut of the turn buckle is attached to a tip portion of the other shaft. If it is configured such that it can be freely inserted into and removed from the formed distal end tubular portion, the strength of the turnbuckle is dramatically improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of the reclining seat according to the present invention, in which a seat back frame 10, a seat cushion frame 11, a seat belt 12, and a turnbuckle 13 as a self-coupling mechanism are main components. Seat cushion frame 11
The rear end of the seat back frame 10 and the lower end of the seat back frame 10 are rotatably mounted by bolts 15 and 17 via wave washers 14 and 16, and a turn buckle 13.
Is provided at a midpoint between the left and right sides of the seat cushion frame 11 and the seat back frame 10 so as to be rotatably fixed at both ends thereof and supported so as to maintain the front-back tilt angle of the seat back frame 10 at an arbitrary angle. Have been.

The seat belt 12 has a belt anchor 18 attached to an intermediate portion of one of the left and right sides of the seat cushion frame 11, and the seat belt 12 is wound around the upper end of the seat back frame 10 on the side where the belt anchor 18 is attached. A tongue 20 slidably passed through the seat belt 12 at the time of sitting is attached to a buckle 21 attached to an intermediate side surface of the seat cushion frame 11 on the side where the belt anchor 18 is not attached. It is used by being detachably engaged.

Next, the structure of the turnbuckle 13 shown in FIG. 1 will be described in detail with reference to the side view of FIG. 2 and the sectional view of FIG. The turnbuckle 13 includes an upper shaft 22 attached to the seatback frame 10, a lower shaft 23 attached to the seat cushion frame 11,
A nut 24 as a main component, and a right-hand threaded portion 22a cut off at a tip end of the upper shaft 22 and the lower shaft 23 on a side not fixed to the frames 10 and 11.
And the left screw portion 23a are screwed into the inner screw portion of the nut 24 so as to be able to advance and retreat. The cylindrical grip 25 covering the nut 24 is made of a soft-touch material such as rubber or synthetic resin. In this embodiment, the upper shaft 2 is formed in consideration of the appearance.
2 and the length of the screw portions 22a, 23a of the lower shaft 23 are hidden. Therefore, by rotating the grip 25 by hand, the nut 24 rotates integrally with the nut 25, and the upper shaft 22 and the lower shaft 23 screwed to the nut 24 advance or retreat in a direction toward or away from each other, and turn. The total length of the buckle 13 changes. And the seat cushion frame 11 and the seat back frame 1
Since 0 is rotatably assembled, the inclination angle of the seat back can be arbitrarily changed by adjusting the length of the turnbuckle 13 suspended there between.

According to such a configuration, the conventional reclining adjuster in which the seat back and the seat cushion are rotatably assembled does not need to be used, so that the reclining seat can be reduced in weight and simplification, and the cost can be reduced. The seat belt 1 can be used in the event of a vehicle collision, etc.
The load applied to the take-up device 19, which is the fixed point on the back side, can be effectively transmitted to the cushion side via the turnbuckle 13, thereby suppressing the generation of a large bending moment applied to the conventional seat back frame or reclining adjuster. Can be

In the turnbuckle 13 of this embodiment, a tip rod portion 22b having a diameter smaller than the diameter of the screw portion is projected from the tip portion of the upper shaft 22 on the screw portion 22a side.
On the other hand, when the tip of the screw portion 23a side of the lower shaft 23 is formed in a cylindrical shape and a tip cylindrical portion 23b is formed therein, and the nut 24 is rotated to reduce the length of the turnbuckle 13, this tip tube is formed. The tip rod portion 22 in the portion 23b
b slides deeper and the length of the turnbuckle 13 becomes longer, the tip rod portion 2
2b is formed so as to slide out. Therefore, between the screw portion 22a of the upper shaft 22 and the screw portion 23a of the lower shaft 23, the distal rod portion 22b and the distal cylindrical portion 23b mutually function as reinforcing members, and the strength of the turnbuckle 13 is dramatically improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a reclining seat according to an embodiment of the present invention.

FIG. 2 is a perspective view of the turnbuckle shown in FIG.

FIG. 3 is a sectional view of the turnbuckle shown in FIG. 1;

FIG. 4 is a perspective view of a conventional reclining seat.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Seat back frame, 11 ... Seat cushion frame, 12 ... Seat belt, 13 ... Turnbuckle, 19 ... Winding device, 22 ... Upper shaft, 22a
... Screw part, 22b tip rod part, 23 lower shaft, 23a screw part, 23b tip cylinder part, 24 nut, 25 grip.

Claims (2)

(57) [Scope of request for utility model registration] A reclining adjuster for supporting a seat back having a lower end pivotally attached to a rear end of a seat cushion in a front-rear direction so as to adjust a tilt angle in a front-rear direction. A reclining seat wherein each end of the connecting mechanism is rotatably connected to an intermediate portion between the side portions of the seat cushion and the seat back. 2. A coupling device according to claim 1, wherein said coupling mechanism is a turnbuckle, and a tip rod portion provided on one of a pair of shafts which are screwed coaxially with a nut constituting said turnbuckle is provided inside a tip tube portion provided on the other. The reclining seat according to claim 1, wherein the shafts are slidably fitted in an axial direction, and the shafts are coaxially supported with each other.