JPH09313291A - Seat cushion structure for seat of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widen a seat face at a developed position and to facilitate developing operation in the seat of a vehicle in which a seat cushion can be developed. SOLUTION: An upper cushion assembly 20 with an upper frame is placed on the upper side of a main cushion assembly 10. In a front and a rear links 32 and 33 one ends of which are rotatably connected respectively with the front and back parts on both left and right sides of the upper frame, another ends are rotatably connected respectively with the front and back ends of a connection link 34 to form a rotational link with four nodes. A sliding pin 38 provided on the back end part of the connection link 34 is slidably hooked on a guide slit 31 formed on the left and right slide bracket 30A fixed on a vehicle body and extending horizontally in the forward and backward direction to make the upper cushion assembly 20 at the front side of the main cushion assembly 10. A folding type auxiliary leg 25 is provided on the upper frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat cushion structure for a vehicle seat, which has a retractable and retractable portion and can be expanded to widen a seat surface.

[0002]

2. Description of the Related Art As a seat cushion structure for a vehicle seat of this type, for example, there is a vehicle seat with a footrest disclosed in Japanese Utility Model Laid-Open No. 59-179732.
In this, a footrest is attached to a front end of a slide frame supported on a lower portion of a seat cushion frame so as to be slidable in the front-rear direction so that the footrest can be rotated approximately half a turn from a lower position to an upper position of the slide frame. With this technology, when not in use, the footrest is moved to the lower position and the slide frame is slid backward to store the footrest under the seat cushion, and when not in use, the slide frame is pulled out and the footrest is rotated to the upper position for deployment. .

[0003]

However, in this technique, since the footrest is stored in the space under the seat when it is not used, only a small seating surface can be taken in the rear seat of a passenger car in which this space is narrow. . Further, since the footrest is rotated to the upper position and deployed during use, if the gap between the seat and the front seat is small when the seat is pulled out, the operability is poor and the seat surface in the deployed state cannot be made sufficiently wide. Therefore, although it can be used as a vehicle seat with a footrest, it cannot be used as a child bed.

An object of the present invention is to solve the above problems and to obtain a vehicle seat which can be used as a child's bed by widening the seat surface in the deployed state and has good operability. And

[0005]

A seat cushion structure for a vehicle seat according to the present invention comprises a main cushion assembly attached to a part of a vehicle body, an upper frame and an upper cushion provided on the upper frame, and the upper side of the main cushion assembly. An upper cushion assembly mounted on the upper frame, a pair of left and right front and rear links rotatably connected at one end to the front and rear of the left and right side members of each upper frame, and each of these links. The front and rear ends are rotatably connected to each other end to form a four-bar rotation chain together with the side member, the front link, and the rear link, and are fixed to a part of the vehicle body to be substantially horizontal in the front-rear direction. A pair of left and right slide brackets having extending guide slits, and provided near the connecting portion of the rear link and the connecting link. If the sliding pin slidably engaged with the guide slit and the rear link or the connection link are provided and the rear link rotates forward and downward with respect to the connection link by a predetermined angle, the other of the two links A stopper portion that engages with the front cushion member and blocks further relative rotation; A pair of slits are provided so that the upper cushion assembly can be moved between a folded position on the main cushion assembly and a deployed position on the front side of the main cushion assembly.

Since the upper cushion assembly is placed on the main cushion assembly in the folded position, its front-rear width can be as wide as the front-rear width of the main cushion assembly. In this folded position, the sliding pin is located at the rear end of the guide slit,
If the upper cushion assembly is moved forward from this position, the front and rear links move forward together with the connecting link while keeping the vertical link, and the sliding pin reaches the front end of the guide slit. When the upper cushion assembly is pushed diagonally forward and downward, the front and rear links rotate forward and downward around the connection point with the connecting link, and the rear link rotates a predetermined angle with respect to the connecting link, and the stopper section further rotates. When the rotation of the upper cushion assembly is stopped, the upper cushion assembly is in a deployed position continuous with the front side of the main cushion assembly. From this state, lift the upper cushion assembly diagonally upward and pull it back,
Return to the original folding position in the reverse order of the above.

The seat cushion constituted by the main cushion assembly and the upper cushion assembly is preferably used as a rear seat. As such, in the deployed position, the upper cushion assembly is seated between the main cushion assembly and the front seat.

It is preferable that each slide bracket is formed with a notch portion cut downward at each of the front and rear ends of the guide slit. In such a case, the upper cushion assembly is moved back and forth by removing the sliding pin provided on the lifting link of the upper cushion assembly from the notch.

[0009] It is preferable that a front leg of the upper frame is provided with an auxiliary leg that is foldable between a housed state housed in the upper frame and a standing state protruding downward. In this way, the front portion of the upper cushion assembly in the folded position is supported by the auxiliary leg.

A recess whose front side is opened may be formed on the upper surface of the main cushion assembly, and the upper cushion assembly may be placed in the recess so as to be movable in the front-rear direction.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the embodiments shown in FIGS. In this embodiment, the present invention is applied to a rear seat A of a passenger car. As shown in FIG. 1, the rear seat A is a bench type including a seat cushion B and a seat back C. As shown in FIGS. 1 to 4 and 7, the seat cushion B includes a main cushion assembly 10, side cushions 19 provided on both sides of the main cushion assembly 10, and a pair of upper cushion assemblies provided on both sides of an upper surface of the main cushion assembly 10. Twenty.

As shown in FIGS. 2 to 4, the main cushion assembly 10 is composed of a main frame 11 and a main cushion 15 which are integrally connected to each other. The main cushion 15 is formed by covering a cushion pad with a cushion cover (not shown), and a pair of left and right rectangular recesses 16 whose front and outer sides are open are formed on the upper surface of the main cushion 15. By attaching the lower edge of the cushion cover to the main frame 11 applied to the side, the two members 10 and 15 are integrally connected. In the recess 16 of the main cushion 15, two pairs of slits 17 are formed deeply from the front edge toward the rear at positions corresponding to front and rear links 32 and 33 described later, and the main frame 11 also corresponds to this. The same number of notches 11a are provided. Side cushions 19 covered by a cushion cover are attached to both sides of the main frame 11 so as to be continuous with both sides of the main cushion assembly 10, whereby both sides of the recess 16 are closed. The upper surfaces of the intermediate protrusion 15a and the rear edge of the main cushion 15 excluding the recess 16 are substantially continuous with the upper surface of the side cushion 19. The rear seat A is attached to the vehicle body by fixing the main frame 11 to the floor F. Main cushion 1
5 and the side cushion 19 may be integrally formed.

As shown in FIGS. 1 to 4 and 7, the upper cushion assembly 20 is a rectangular one composed of an upper frame 21 and an upper cushion 28 mounted on the upper frame 21. It is provided on the pair of left and right recesses 16 formed so as to be movable in the front-back direction. The upper frame 21 is shown in FIG.
As shown in FIG. 4, a pair of left and right inward U-shaped cross-sectional side members 22 are welded and connected by front and rear pipe-shaped connecting members 23, and the two S springs 24 have left and right ends. It is locked on the upper side of the side member 22 and stretched between them. Further, end fittings 25a at both ends of the auxiliary leg 25, which is a U-shaped bent pipe material, are swingably attached to the two pairs of plates 23a welded to the rear side of the front connecting member 23 by hinge pins 26. This auxiliary leg 25 is a spring and a stopper (both not shown).
Thus, it is configured to be foldable between the stored state (see FIGS. 3 and 4) and the upright state (see FIG. 2) and held in each state, and the rubber foot 25b is provided at the tip portion. .

The upper cushion 28 is formed by covering a rectangular cushion pad corresponding to the concave portion 16 with a sewn cushion cover (not shown). The upper frame 21 abutting in the concave portion below the upper cushion 28 is covered with the cushion cover. By attaching the lower edge of the two members 21, 28, the upper cushion assembly 20 is integrated. With the overall thickness of the upper cushion assembly 20 being substantially the same as the depth of the recess 16, the upper cushion assembly 20 is placed on the recess 16 of the main cushion assembly 10 in a folded state. The intermediate projection 15a of 15 and the upper surface of the side cushion 19 are substantially continuous with each other.

As shown in FIGS. 2 to 4, each pair of front link 32 and rear link 33 having the same length is
The upper end is rotatably supported on the front and rear of each side member 22 of the upper frame 21 by an upper pin 37 so as to be rotatable around the horizontal axis, and the lower end is attached to the front and rear ends of the connecting link 34 by front pins 35 and rear pins 36. It is connected so as to be rotatable about the left-right axis. The distance between the front and rear upper pins 37 and the distance between the front and rear pins 35, 36 are the same, and therefore, the side member 22 and the links 3 are the same.
2, 33 and 34 form a parallelogram four-bar rotation chain. The four-bar rotary chain does not necessarily have to be a parallelogram, for example, the front link 32 is longer than the rear link 33.

As best shown in FIG.
At the rear edge of the rear link 33 in the vertical state, a stopper portion 33a engageable with the connecting link 34 is bent and formed. As shown in FIG. 7 (c), this stopper portion 33a engages with the upper edge of the connecting link 34 in the deployed position where the rear link 33 is tilted forward and becomes substantially horizontal,
The rear link 33 is prevented from further rotating with respect to the connecting link 34. Instead of providing the stopper portion 33a on the rear link 33, the stopper portion 33a may be provided on the lower edge of the connecting link 34 so that if the rear link 33 is tilted to a substantially horizontal position, the stopper portion 33a abuts against it and prevents further rotation. Although illustration is omitted, both the front and rear links 32 and 33 and the connecting link 34 or the side member 22 are provided with the both links 3.
A stopper may be provided to prevent the members 2 and 33 from falling backward from the vertical.

As shown in FIGS. 5 and 6, the upper pin 3
7 is a stepped collar 3 with a bolt 37a and a nut 37c.
7b is fastened and fixed to the front and rear portions of the side member 22, and the upper ends of the links 32 and 33 are rotatably attached to the small diameter portion between the head portion of the bolt 37a and the large diameter portion of the stepped collar 37b. Has been. Similarly, the front pin 35 is obtained by tightening and fixing the stepped collar 35b to the lower end portion of the front link 32 with the bolt 35a and the nut 35c, and the front end portion of the connecting link 34 is rotatable to the small diameter portion of the stepped collar 35b. It is installed. On the other hand, the rear pin 36 has the stepped collar 36b and the sliding pin 38 by the caulking pin 36a and the washer 36c.
It is fixed to the lower end of 3 by caulking, and the connecting link 3
The rear end portion of 4 is rotatably attached to a small diameter portion between the washer 36c and the large diameter portion of the stepped collar 36b. The sliding pin 38 includes a slide bracket 30A,
It is slidably engaged with the guide slit 31 of 30B.

As shown in FIGS. 1 to 4, two pairs of slide brackets 30A and 30B are fixed on the floor F by welding or bolting corresponding to the two pairs of slits 17 formed in the main cushion 15. ing. A cushion receiving portion 30 that supports the outer edge portion of the main cushion 15 is provided on the upper edges of the pair of outer slide brackets 30A.
Although a is formed by bending, the upper edges of the pair of inner slide brackets 30B are still cut. Each of the slide brackets 30A and 30B has a long and narrow guide slit 3 extending straight in the front-rear direction longer than the connecting link 34.
1 is formed, and a notch portion 31a cut downward is formed at the front and rear ends thereof. The guide slit 31 is slidably engaged with a small diameter portion of a sliding pin 38 provided at a connecting portion of the rear link 33 and the connecting link 34, and a lateral movement is slid with a head portion of the caulking pin 36a. It is blocked by the large diameter portion of the pin 38.

When the rear seat A is normally used, as shown in FIGS. 1, 3, 4 and 7 (a), the upper cushion assembly 20 is not attached to the main cushion assembly 1.
0 is mounted on the recess 16 and the left and right rear links 3
3 each slide pin 38 at the lower end is the slide bracket 30
Notch 3 at the rear end of the guide slit 31 provided in A and 30B
It is located within 1a. In this state, the cushioning action for the occupant sitting on the upper cushion assembly 20 is
This is done by the upper cushion 28 and the S spring 24.
When the rear portion of the upper cushion assembly 20 is lifted and moved forward from this state, the sliding pin 38 is disengaged from the notch portion 31a at the rear end of the guide slit 31, and the front and rear links 32, 33 remain substantially vertical. Connection link 3
4, the slide pin 38 moves forward with the guide slit 3
1 and moves into the notch 31a at the front end of the guide slit 31, as shown in FIG. 7 (b).

In this state, the upper cushion assembly 2
If the auxiliary leg 25 stored under 0 is erected and then the upper cushion assembly 20 is pushed further forward, the connecting link 34 does not move any further, so the front and rear links 32, 33 move to the front. Further, the rear pins 35 and 36 are pivoted forward and downward, and the upper cushion assembly 20 is also moved diagonally forward and upward along the arc. Then, when the rear link 33 is rotated with respect to the connecting link 34 to a predetermined horizontal angle, the stopper portion 33a engages with the upper edge of the connecting link 34 as shown in FIG. The movement is stopped, and the upper cushion assembly 20 is in a deployed position where it is continuous with the front side of the main cushion assembly 10. In this deployed position, the front portion and the rear portion of the upper frame 21 of the upper cushion assembly 20 have the auxiliary leg 25 and the stopper portion 3 respectively.
Supported by 3a.

When the upper cushion assembly 20 is lifted obliquely rearward and pulled backward from this deployed position, the front and rear links 32, 33 first rotate about the front and rear pins 35, 36 to move the upper cushion assembly 20. When the auxiliary leg 25 is folded obliquely upward along the arc and the upper cushion assembly 20 is pulled rearward, the sliding pin 38 moves rearward along the guide slit 31 to move the rear end. Enters into the notch 31a and returns to the original folding position where it is placed on the main cushion assembly 10.

The upper cushion assembly 20 is placed on the main cushion assembly 10 in the folded position, and its front-rear width can be widened to the same extent as the front-rear width of the main cushion assembly 10, so that FIG.
In the deployed position shown in (c), the front and rear edges of the upper cushion assembly 20 can be brought into contact with the front edge of the main cushion assembly 10 and the rear surface of the front seat D. As a result, in the deployed position, a wide and easy-to-use seating surface that can also be used as a child bed can be formed. Further, since the upper cushion assembly 20 can be brought to the deployed position by simply moving it forward, the operation is easy even though the gap between the main cushion assembly 10 and the front seat D can be eliminated.

In the embodiment described above, since the intermediate cushion 15a is provided on the main cushion 15, a gap is created between the left and right upper cushion assemblies 20 at the deployed position. However, the present invention can also be carried out by eliminating the intermediate protrusion and continuing the left and right upper cushion assemblies in the deployed position, and by doing so, a wider and more convenient seating surface can be formed. .

[0024]

As described above, according to the present invention, the front and rear width of the upper cushion assembly can be widened to the same extent as the front and rear width of the main cushion assembly, and the seating surface in the deployed position is wide. Therefore, it can be used not only as a footrest but also as a child bed. Moreover, in order to move from the folded position to the deployed position, first, the upper cushion assembly is pushed forward and then diagonally forward and downward, so that the operation is easy.

If the seat cushion constituted by the main cushion assembly and the upper cushion assembly is used as the rear seat, the upper cushion assembly can be inserted between the main cushion assembly and the front seat in the expanded position and its width can be increased. Therefore, it is possible to reduce the gap between the front seat and the front seat to improve the usability in the deployed position.

According to the slide bracket having the guide slits formed with the cutouts at the front and rear ends, the upper cushion assembly is moved forward and backward by sliding the slide pins provided on the links. Since the operation is performed by removing the upper cushion assembly from the cutout portion, there is no risk of the upper cushion assembly moving unintentionally in the folded position or the expanded position.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a rear seat provided with a seat cushion structure according to the present invention in a folded position.

FIG. 2 is a partially exploded perspective view showing the overall structure of an embodiment of a seat cushion structure for a vehicle seat according to the present invention.

FIG. 3 is a vertical cross-sectional view of the central portion of the upper cushion assembly of the embodiment shown in FIG.

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

5 is an enlarged sectional view taken along line 5-5 of FIG.

6 is an enlarged cross-sectional view of a portion X of FIG.

FIG. 7 is an operation explanatory view of the present invention.

[Explanation of symbols]

10 ... Main cushion assembly, 16 ... Recess, 17
... slits, 20 ... upper cushion assembly, 21
... upper frame, 22 ... side member, 25 ... auxiliary leg, 28 ... upper cushion, 30A, 30B ... slide bracket, 31 ... guide slit, 31a ... notch, 32 ... front link, 33 ... rear link, 33a
... Stopper part, 34 ... Connection link, 38 ... Sliding pin, A
... rear seat, B ... seat cushion.

Claims (5)

[Claims] 1. A main cushion assembly mounted to a part of a vehicle body, an upper cushion assembly mounted on an upper side of the main cushion assembly, which includes an upper frame and an upper cushion provided thereon, and each of the upper frames. A pair of left and right front and rear links, one end of which is connected to the front and rear portions of the left and right side members so as to be rotatable about a lateral axis, and front and rear ends of the other end of each link. A pair of left and right connecting links that are rotatably connected about a lateral axis to form a four-bar rotation chain together with the side member, the front link, and the rear link, and are fixed to a part of the vehicle body in the front-rear direction. A pair of left and right slide brackets having horizontally extending guide slits, and a pair of front and rear slide brackets provided near the connecting portion of the rear link and the connecting link. A pair of left and right sliding pins that are slidably engaged with the guide slits, and the rear links provided on either one of the rear links and the connecting links are directed forward and downward with respect to the connecting links to a predetermined angle. When it rotates, it engages with the other of the two links to prevent further relative rotation, and is cut rearward from the front edge of the main cushion assembly corresponding to the front and rear links. Each of the links is composed of a pair of slits movable inside thereof, and the upper cushion assembly is movable between a folded position on the main cushion assembly and a deployed position on the front side of the main cushion assembly. Seat cushion structure for vehicle seats. 2. The seat cushion structure for a vehicle seat according to claim 1, wherein the seat cushion constituted by the main cushion assembly and the upper cushion assembly is a rear seat. 3. The seat cushion for a vehicle seat according to claim 1, wherein each of the slide brackets is formed with a notch portion cut downward at each of front and rear ends of the guide slit. Construction. 4. The front leg of the upper frame is provided with an auxiliary leg that is foldable between a housed state housed in the upper frame and a standing state protruding downward. A seat cushion structure for a vehicle seat according to claim 3. 5. The main cushion assembly is formed with a recess whose front side is opened on the upper surface, and the upper cushion assembly is placed in the recess in the folded position. The seat cushion structure for the vehicle seat described in No. 3.