JPH07304363A - Infant seat cushion - Google Patents

Abstract

PURPOSE:To prevent the springing-up of an infant seat cushion incorporated with a seat back and prevent the springing-out to a front side when a vehicle stops suddenly. CONSTITUTION:At both the end parts of the supporting shaft 27 of the cushion frame 26 of an infant seat cushion 25, a pair of arms 29 having a guide pin 29a fixed at the top end part are fixed in parallel both other. Both the end parts of the supporting shaft are pivotally supported on a supporting plate 20 fixed in parallel at the lower part of a seat back frame, and each guide pin is shifted in an arcuate groove 22 formed on the supporting plate. The top end parts 30c and 31c of a first and a second lock lever 30 and 31 which are installed on the supporting plate 20 and interlocked with each other and swung are superposed with the arcuate groove and shift between a first position for suppressing the shift of the guide pin 29a and a second position separated from the arcuate groove. Both the lock levers are urged to the first position by a spring 36, and shifted to the second position by the manual operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a child seat cushion which is openably and closably housed in a front side of a seat back of a vehicle seat.

[0002]

2. Description of the Related Art A seat cushion for children of this type is disclosed in Japanese Utility Model Laid-Open No. 62-28642. In this conventional technique, one end of an auxiliary seat cushion provided in the recess formed on the front side of the seat back is pivotally attached to the lower part of the recess so that it can be deployed on the seat cushion.
A band for suspending the auxiliary seat cushion at the time of expansion is provided between the inner surface of the recess and both sides of the free end portion of the auxiliary seat cushion.

[0003]

However, since the above-mentioned child seat cushion of the prior art does not have a lock mechanism, the seat cushion pops up when traveling on a bad road and has poor stability, and is stored in the recess of the seat back. If you stop suddenly in this state, there is a problem that the child seat cushion will pop out to the front due to inertial force. In addition, since there are strips on both sides of the seat cushion for a child when the seat cushion is deployed on the seat cushion, there is a problem in that the strips interfere with the usability. The present invention aims to solve each of these problems.

[0004]

To this end, the child seat cushion according to the present invention has, as illustrated in FIGS.
Seat cushion 1 that is pivotally supported by the seat back 15 and is housed in a recess 15a formed in the front side of the seat back 15.
In a child seat cushion that can be opened and closed between 0 and an open position that is deployed almost parallel, a support shaft 27 fixed to the base end side of a cushion frame 26 of the child seat cushion 25, and this support. A pair of arms 29 fixed to both ends of the shaft 27 in a radial direction and fixed in parallel to each other, and fixed to each tip end thereof with guide pins 29a protruding in parallel to the support shaft 27, and the seat back 15 in parallel with each other. A pair of support plates 20 fixed to the lower part of the frame 16 to pivotally support both ends of the support shaft 27, and move on an arc centered on the support shaft 27 formed on each of the support plates and opening and closing. Between the circular arc groove 22 that receives each of the guide pins 29a and the one end of the circular arc groove 22 that is pivotally supported by the one support plate 20. And a first position that overlaps with the circular arc groove and a second position where the distal end portion of the circular arc groove 22 deviates from the circular arc groove 22 in the radial direction, and a first lock lever 30 that interlocks with the first lock lever 30. The first position and the same tip end portion that is pivotally supported by the one support plate 20 and overlaps the circular arc groove 22 with the distal end portion 31c leaving a slight gap between the distal end portion 31c and the other inner end of the circular arc groove 22 are provided. A second lock lever 31 that swings between a second position radially away from the circular arc groove 22 and a spring 36 that elastically biases the lock levers 30 and 31 to the first position. It is characterized by comprising manual operation members 33, 40 for moving both the lock levers 30, 31 to the second position against the spring 36.

[0005]

In the normal state, the first and second lock levers 3
0 and 31 are biased to the first position by the spring 36, and their respective tip portions 30c and 31c overlap the circular arc groove 22 with a slight gap between one end and the other end of the circular arc groove 22, respectively. ing. In this state, when the child seat cushion is housed in the recess 15a of the seat back 15, the guide pin 29a is located in one of the gaps, and the guide pin 29a moves in the opening direction by one of the tip portions 30c and 31c. When the movement is restrained and when the seat cushion 10 is deployed on the seat cushion 10, the guide pin 29a is positioned in the other gap, and the movement in the closing direction is restrained by the other of the tip portions 30c and 31c. Applying force to the manually operated members 33, 40,
1st and 2nd lock lever 3 resisting spring 36
By rocking 0, 31 to remove the tip portions 30c, 31c from the circular arc groove 22 in the radial direction, the lock levers 30, 3 are locked.
The restraint by the tip portions 30c and 31c of 1 and the guide pin 29a is released, and the child seat cushion can be opened and closed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. As shown in FIGS. 5 and 8, a vehicle seat incorporating the child seat cushion of the present invention comprises a seat cushion 10 and a seat back 15, and the seat back 15 is housed in a recess 15a formed on the front side. Seated position (see FIG. 5) and seat cushion 10
A child seat cushion 25 is pivotally supported so as to be openable and closable between and a substantially parallel deployed position (see FIG. 8). As shown in FIG. 1, the frame 1 of the seatback 15
Reference numeral 6 is composed of a frame pipe 18 and a pair of left and right upper arms 17 welded to both sides of a lower portion thereof.
The lower end of the lower arm 11 is fixed to the car body.
Is attached so as to be swingable in the front-rear direction via a connecting rod 19, and is fixed by a reclining device (not shown) so that the tilt angle can be adjusted.

The cushion frame 26 of the child seat cushion 25, as shown mainly in FIGS. 1 and 2,
The support shaft 27, a U-shaped main pipe 28 whose base end is welded to the support shaft 27, the support shaft 27 and the main pipe 2.
8, a pair of arms 29 are welded to both ends of the support shaft 27 in parallel with each other and at a substantially right angle to the seat plate 28a. A guide pin 29a protruding outward in parallel with 27 is welded. A portion of the cushion frame 26 inside each arm 29 is covered with a seat cushion pad 26a (see FIG. 3) and a skin (not shown) that encloses the seat cushion pad 26a.

On the other hand, inside the left and right upper arms 17, which are the lower parts of the seat back 15, a pair of support plates 20 are provided so as to be parallel to each other.
It is fixed by a hexagon bolt 23 via 0a.

Both end portions of the support shaft 27 of the cushion frame 26 projecting from the respective arms 29 have respective support plates 20.
It is pivotally supported in the support hole 21 formed in the above and is prevented from coming off by the retaining ring 24. In this state, the tip end portion of the guide pin 29a protruding outward from each arm 29 has the support hole 21
A circular arc groove 22 formed in the support plate 20 centering on the
The cushion frame 26 protrudes through the inside, whereby the cushion frame 26 has an open position in which the child seat cushion 25 is deployed substantially parallel to the seat cushion 10 and a closed position in which the cushion frame 26 is housed in the recess 15a formed on the front side. It can be opened and closed between and. 1 and 2 show only one half of the support plate 20 and the cushion frame 26,
As far as the above configuration is concerned, the other half is also the same. The center angle of the arc groove 22, that is, the opening / closing angle of the child seat cushion 25 is slightly larger than 90 degrees.

2 to 4, a mechanism for restraining the child seat cushion 25 in the open position and the closed position and releasing the restraint by a manual operation will be described. This mechanism
Of the left and right support plates 20, it is provided only on the support plate 20 on the side shown in FIGS. 1 and 2, and its mounting position is on the opposite side of the cushion frame 26.

The small-diameter portion 32a on the base end side of the operating shaft 32 is inserted into the hole 30a in the intermediate portion of the first lock lever 30 and fixed by welding or the like. It is inserted into the hole 20b and is rotatably caulked. A handle 33 is fixed to the tip of the operating shaft 32 by a set screw 33a. On the other hand, at the tip of the hinge pin 34 which is inserted into the hole 20c of the support plate 20 and welded and protrudes, the second lock lever 31
An intermediate hole 31a is inserted and rotatably caulked. A hole 30b and an elongated hole 31 provided at the tips of arms of the first and second lock levers 30 and 31 that extend inward relative to each other.
b is connected by a connecting pin 35, whereby both lock levers 30 and 31 are rocked in conjunction with each other.

As a result of this swing, the distal end portions 30 of the arms of the first and second lock levers 30 and 31 extending outwardly from each other.
The c and 31c move between a first position (see the solid line position in FIG. 3) overlapping with the arc groove 22 and a second position (see the solid line position in FIG. 6) radially outward from the arc groove 22. In this first position, as shown in the figure, each tip 3
A gap is formed between 0c, 31c and each inner tip of the arcuate groove 22 so that the guide pin 29a just fits therein when viewed in the axial direction of the support shaft 27. The lock levers 30, 3 are provided between the outwardly extending arm of the second lock lever 31 and the hooks 37, 38 fixed to the support plate 20, respectively.
A spring 36 that elastically biases 1 to the first position is provided. In this first position, the urging force of the spring 36 is received by the connecting pin 35 coming into contact with the inner end surface on the outside of the elongated hole 31b. When the handle 33 is manually rotated in the direction of the arrow M (see FIGS. 5 and 6), the lock levers 30 and 31 are rotated against the spring 36 to be in the second position.

Next, the operation of the above embodiment will be described. When the handle 33 is not rotated, as shown in FIGS. 3 and 7, the first and second lock levers 30 and 31 are biased to the first position by the spring 36. In this state, as shown in FIG. 5, the child seat cushion 25
Is in the closed position housed in the recess 15a formed on the front side, as shown in FIG.
The guide pin 29a at the tip of the arm 29 of No. 6 is located in the gap formed between the tip portion 30c of the first lock lever 30 and one inner tip of the arc groove 22, and the movement in the opening direction is caused by the movement of the support plate 20. The tip end of the more protruding guide pin 29a and the tip end 30c of the first lock lever 30 are brought into contact with each other to be restrained. Therefore, even if the forward acceleration increases, such as when the vehicle suddenly stops, the child seat cushion 25 does not pop out to the front side due to the inertial force. In this state,
The seat cushion pad 26a on the front side forms a part of the cushion pad of the seat back 15.

Further, as shown in FIG. 8, when the child seat cushion 25 is in the open position expanded substantially parallel to the seat cushion 10, as shown in FIG. Guide pin 29a
Is the tip end portion 31c of the second lock lever 31 and the circular arc groove 22.
Is located in the gap formed between the other inner tips of the. In this state, the load applied to the child seat cushion 25 is supported by the guide pin 29a coming into contact with the other inner tip of the arc groove 22, and the movement in the closing direction is the tip of the guide pin 29a protruding from the support plate 20. And the distal end portion 31c of the second lock lever 31 is abutted and restrained. Therefore, even when the vertical acceleration increases, such as when driving on a rough road, the seat cushion 2 for children is caused by the inertial force.
5 does not bounce and the stability deteriorates.

When force is applied to the handle 33 to rotate it in the direction of the arrow M, the lock levers 30 and 31 cause the spring 3 to move.
6, the tip ends 30c and 31c are in the second position out of the arc groove 22, as shown by the solid line in FIG. As a result, the guide pin 29a restrained by the distal end portion 30c in the closed state is released from restraint, so that the child seat cushion 25 can move in the opening direction as shown in FIG. Once the restraint is released and the guide pin 29a passes inwardly through the tip portion 30c, the force applied to the handle 33 is released and the lock levers 30 and 31 are returned to the first position, so that the seat cushion 25 for the child does not move. Movement in the opening direction is free. The guide pin 2 that moves in the arc groove 22 when the child seat cushion 25 approaches the open position
9a pushes up the tip end portion 31c of the second lock lever 31 against the spring 36, and moves past the tip end portion 31c to reach the open position shown in FIG. Returning to the first position shown in Figure 3, the child seat cushion 25 is constrained to the open position and cannot return. Further, in the child seat cushion 25 restrained in the open position, the handle 33 is similarly rotated in the direction of the arrow M to release the restraint of the guide pin 29a by the tip portion 31c of the second lock lever 31, Can be returned to the closed position.

In the embodiment described above, the handle 33 is used as a manual operation member for moving the lock levers 30, 31 in the first position to the second position against the spring 36. In the modified embodiment shown in FIG. 11, the unlocking strap 40 is used as the manual operation member. In this modified embodiment, the intermediate portion of the first lock lever 30 is rotatably caulked by a stepped hinge pin 39 that is welded and fixed to the support plate 20, and the first lock extending outward with respect to the second lock lever 31. One end of a lock release strap 40 is attached to the middle of the arm of the lever 30 by a caulking pin 41. By pulling this unlocking strap 40 backward as shown by the arrow,
Each lock lever 30, 31 resists the spring 36,
The respective tip portions 30c and 31c move from the first position where they overlap the arc groove 22 to the second position where they are radially offset.

In the above-mentioned embodiment, since the operation for releasing the restraint of the guide pin 29a is carried out by the rotation of the handle 33, there is a possibility that an erroneous operation of rotating in the opposite direction may be made. In the example, it is sufficient to pull the lock release strap 40, so there is no risk of erroneous operation. Since other configurations and operations are similar to those of the above-mentioned embodiment,
Only the same parts are designated by the same reference numerals, and detailed description thereof will be omitted.

[0018]

As described above, according to the present invention, unless the manual operation member is operated, the movement of the child seat cushion is restricted in the stored and deployed states, so that the unfolded road can be prevented. This solves the problem that the vehicle jumps up when traveling and the stability deteriorates, and when the vehicle suddenly stops while it is stored in the recess of the seat back, it jumps forward due to inertial force. Further, each of the members for restraining the above is provided near the pivotal support portion of the child seat cushion with respect to the seat back, and does not need to be provided in a portion projecting from the seat back in the deployed state. Both sides are released, improving usability.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view showing a state where a cushion frame is attached to a seat back frame according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view including a restraint mechanism of the child seat cushion of the embodiment shown in FIG.

FIG. 3 is a partial side view of the main part of the embodiment shown in FIG. 1 with the child seat cushion closed.

4 is a sectional view taken along line 4-4 of FIG.

FIG. 5 is an overall perspective view of the seat with the child seat cushion of the embodiment shown in FIG. 1 closed.

FIG. 6 is a partial side view of the main part of the child seat cushion of the embodiment shown in FIG. 1 during opening.

FIG. 7 is a partial side view of the essential parts of the embodiment shown in FIG. 1 with the child seat cushion open.

FIG. 8 is an overall perspective view of the seat in the state where the child seat cushion of the embodiment shown in FIG. 1 is opened.

FIG. 9 is a partial side view of the essential part of the modified embodiment with the child seat cushion closed.

10 is a sectional view taken along line 10-10 of FIG.

FIG. 11 is a cross-sectional view along the unlocking strap of the modified embodiment.

[Explanation of symbols]

10 ... Seat cushion, 15 ... Seat back, 15a
... recesses, 20 ... support plate, 22 ... arc groove, 25 ... child seat cushion, 26 ... cushion frame, 2
7 ... Support shaft, 29 ... Arm, 29a ... Guide pin, 30
... 1st lock lever, 30c ... Tip part, 31 ... 2nd lock lever, 31c ... Tip part, 33, 40 ... Manual operation member, 36 ... Spring.

Claims (1)

[Claims] 1. A closed position in which both lower sides are pivotally supported by a seat back of a vehicle seat and is accommodated in a recess formed in the front side of the seat back, and an open position in which the seat cushion is deployed substantially parallel to the seat cushion. In a child seat cushion that can be opened and closed between, a support shaft fixed to a base end portion side of a cushion frame of the child seat cushion, and both end portions of the support shaft protruding in a radial direction and fixed in parallel to each other. A pair of arms having guide pins fixed to each tip portion and protruding in parallel with the support shaft, and a pair of supports fixed to the lower portion of the frame of the seat back in parallel with each other and pivotally supporting both ends of the support shaft. A plate, an arc groove formed in each of the support plates to receive each of the guide pins that moves on an arc centered on the support shaft with the opening and closing, and one of the support plates. A first position in which the tip portion is pivotally supported by the shaft and the tip portion overlaps the arc groove while leaving a slight gap between the tip portion and the inner end of the arc groove, and a second position in which the tip portion is radially displaced from the arc groove. Between the first lock lever, which is swingable between the two, and the one end which is pivotally supported by the one support plate so as to be swingable in conjunction with the first lock lever and the tip end of which is inside the other end of the arc groove. A second lock lever that swings between a first position overlapping the arcuate groove with a gap left and a second position in which the tip end is radially displaced from the arcuate groove, and both lock levers are the first position. A seat cushion for a child, comprising: a spring that elastically urges the seat and a manual operation member that moves the lock levers to the second position against the spring.