JP3530031B2 - Car seat equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat device for a motor vehicle in which a seat back is provided on a seat cushion so as to be able to lean forward. 2. Description of the Related Art In a seat device provided in an automobile, from the viewpoint of expanding the application, for example, when the seat back is tilted forward to a seat cushion side, the back surface of the seat back is made substantially horizontal. In some cases, a step hinge structure is employed, so that the back surface of the seat back can be used for a table. Conventionally, as this type of seat apparatus, as shown in FIG. 6, for example, a seat cushion 50 and a seat back 51 are connected by a hinge plate 52 via first and second hinge shafts 54 and 55, and A lock mechanism 53 for preventing the seat back 51 from rotating around the second hinge shaft 55
There is a thing of the structure which arranged. The lock mechanism 53 arranges the plate 56 rotatably between a lock position and a release position, and urges the plate 56 in a lock direction by an urging spring (not shown). The seat back 51 is tilted forward in a state where the lock knob 57 is lifted up and the lock is released. [0005] However, in the above-mentioned conventional seat apparatus, a complicated operation of moving the lock knob forward and pulling it up against the urging force is required, and the operability is low. is there. Further, since the structure of the lock mechanism is complicated and the number of parts is large, there is a problem that the cost increases. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and provides an automobile seat apparatus which can improve operability by eliminating a complicated forward operation and simplify the structure and reduce costs. It is intended to be. SUMMARY OF THE INVENTION The present invention relates to a vehicle seat apparatus having a seat cushion disposed on a floor, and a seat back disposed forwardly on the seat cushion. A lower end of a hinge plate is rotatably supported on a side wall of the seat cushion by a first hinge member, and a side wall of the seat back is rotatably supported on an upper end of the hinge plate by a second hinge member. An engaging piece is disposed on the back, and when the engaging piece abuts on the seat cushion, rotation of the second hinge member in the forward direction around the second hinge member is restricted, and the first hinge member is provided. The cam plate is characterized in that a cam plate is provided which allows a forward rotation around the center. In the seat device according to the present invention, the engaging piece engages with the engaging surface of the cam plate during normal seating, so that the second hinge member of the seat back is centered. The rotation in the forward leaning direction is restricted, so that the occupant can sit on the seat without any trouble. In order to tilt the seat back forward, the seat back is slightly tilted forward about the first hinge member. Then, the engagement piece is disengaged from the cam plate, and the rotation restriction of the second hinge member is released, so that the seat back can rotate around the first and second hinge members. In this state, the seat back is moved forward to the upper surface of the seat cushion. In order to use the seat back as a table, the lower end of the seat back that has been moved forward is lifted upward, thereby holding the rear surface of the seat back in a substantially horizontal position. As described above, according to the present invention, the seat back is rotatably supported on the seat cushion by the hinge plate via the first and second hinge members, and the engagement piece is disposed on the seat back. Since the seat cushion is provided with a cam plate that restricts the pivoting of the seat hinge in the forward direction about the second hinge member and allows the pivoting of the seat hinge in the forward direction about the first hinge member. When the back is used as a table, the seat back is tilted slightly forward to release the engagement, and then the seat back needs only to be moved forward to the seat cushion, and the conventional lock knob is opposed to the urging force. The operation can be performed easily as compared with the case where the player is moved forward in the raised state, and the operability can be improved. Further, according to the present invention, an engaging piece is provided on a seat back,
Since the cam plate is simply provided on the seat cushion, the number of components can be reduced, the structure can be simplified, and the cost can be reduced as compared with the case where a conventional lock mechanism is provided. Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 5 are views for explaining an automobile seat device according to an embodiment of the present invention. FIG. 1 is a side view showing an operation of a seat back of the seat device, and FIG. 2 is an engagement piece and a cam. 3 is a sectional view of the hinge plate, FIG. 4 is a perspective view of the hinge plate, and FIG. 5 is a schematic perspective view of the seat back as viewed from the rear. In FIG. 1, reference numeral 1 denotes a seat device, which is disposed on a vehicle body floor 2 and supports a passenger's buttocks, and a left and right two-part seat backs 4 and 4 which support the back from the waist. Each of the seats 3 and 4 has a schematic structure in which a cushion pad is provided on a frame-shaped seat frame and these are covered with a skin. The upper surface 3a of the seat cushion 3 is higher toward the front side so that the inclination angle is about 10 degrees, and the seat back 4 in a normal sitting position is slightly inclined backward. This improves the sitting comfort and stabilizes the sitting posture. A resin tray 5 having a storage recess 5a is provided on the back surface 4a of the seat back 4. The tray 5 functions as a table when the seat back 4 is tilted forward. A hook-shaped striker 6 is attached to the upper end of the seat back 4 on the inside of the vehicle. The striker 6 is engaged with an engaging member 7 attached to the inner side wall of the seat back 4 'on the right side. Is releasably engaged. As a result, the rearward rotation of the seat back 4 is prevented. Note that the striker 6 may be attached to the outside of the seat back 4 on the vehicle. In this case, the engaging member 7 is attached to the vehicle body panel. Left and right side walls 4b, 4 of the seat back 4
A band plate-shaped hinge plate 10 extending downward along the side wall 4b is provided at b. The left and right hinge plates 10 are connected by a connecting pipe 11,
This prevents the left and right hinge plates 10 from being twisted or displaced in the front-rear direction. The lower end portion 10a of each hinge plate 10
Is the first on the rear end of the left and right side walls 3b of the seat cushion 3.
The upper end 10b is connected via a hinge member 12.
Is connected to a lower portion of the left and right side walls 4b of the seat back 4 via a second hinge member 13. Thus, the seat back 4 is supported by the first hinge member 12 so as to be able to rotate back and forth, and is also rotatably supported by the second hinge member 13. The first hinge member 12 has a structure in which a stepped bolt 15 is fastened and fixed to a seat frame 16 of the seat cushion 3 with a nut 17 and a collar 18 is interposed between the bolt 15 and the hinge plate 10. Things. In the same manner as described above, the second hinge member 13 fastens and fixes the stepped bolt 19 to the seat frame 20 of the seat back 4 with a nut 21, and supports the hinge plate 10 with the collar 19 interposed between the bolt 19. It has a structure. The seat frame 20 of the seat back 4
Is fixed to the stopper member 25. The stopper member 25 connects the seat back 4 to the upper surface 3 of the seat cushion 3.
a, the rear surface 4a of the seat back 4 is held at a substantially horizontal position. An engaging piece 27 is disposed on the side wall 4b of the seat back 4 so as to protrude downward from the bottom surface of the seat back 4, and the engaging piece 27 is attached to the seat frame 20.
Are fixed by welding or fastening members. The engagement piece 27 is made of a tongue-shaped thick iron plate, and has a rounded bottom rear edge. A cam plate 28 is provided on the side wall 3b of the seat cushion 3. This cam plate 2
Reference numeral 8 is made of an iron plate having substantially the same thickness as the engagement piece 27, and is fixed to the seat frame 16 by welding or the like. On the upper surface of the cam plate 28,
When the engagement piece 27 comes into contact, the rotation in the forward direction around the second hinge member 13 is restricted, and the rotation in the forward direction around the first hinge member 12 is allowed. An arcuate cam 28a is formed, and the arcuate cam 28a is formed with a concave portion 28b which is bent forward and downward in a stepwise manner. Next, the operation and effect of this embodiment will be described. When a normal seat is used, the striker 6 of the seat back 4 is engaged with the engaging member 7 to prevent the seat back 4 from turning in the backward direction, and the engaging piece 27 is engaged with the arc cam 28a of the cam plate 28. As a result, rotation about the second hinge member 13 is prevented. As a result, the seat back 4 is held at the sitting position without shaking. To lower the seat back 4 forward, the engagement of the striker 6 is released, and the seat back 4 is rotated slightly forward about the first hinge member 12. Then, the engagement piece 27 is recessed from the arcuate cam 28a of the cam plate
8b, whereby the seat back 4 can rotate around the first and second hinge members 12, 13. In this state, the seat back 4 is lowered onto the upper surface 3a of the seat cushion 3. When the seat back 4 is used as a table, the lower end of the seat back 4 which has been moved forward is
The hinge plate 10 is lifted upward until it comes into contact with the stopper member 25. Thereby, the back 4 of the seat back 4
a is held substantially horizontally, so that the tray 5 can be used as a table. When the seat back 4 is folded, the seat back 4 is pushed down so that the front surface of the seat back 4 is aligned with the upper surface 3a of the seat cushion 3. Thereby, the space between the rear part of the seat back 4 and the rear part of the seat cushion 3 can be eliminated, and the seat back 4 can be folded compactly. As described above, according to this embodiment, the seat back 4 is attached to the seat cushion 3 by the first and second hinge members 1.
2 and 13, which are rotatably connected by a hinge plate 10, and an engagement piece 27 is formed to protrude downward from a side wall 4 b of the seat back 4. Since the cam plate 28 which restricts the pivoting of the hinge member 13 in the forward direction and the pivoting of the first hinge member 12 in the forward direction is fixed, the seat back 4 is fixed. In order to move the seat back 4 forward, the seat back 4 is slightly tilted forward to release the engagement of the engagement pieces 27, and in this state, the operation of simply moving the seat back 4 forward on the upper surface 3a of the seat cushion 3 is sufficient. Operation can be performed more easily than in the case where the conventional lock knob is pulled forward in a state where it is pulled up against the urging force, and operability can be improved. In the present embodiment, the tongue-shaped engaging piece 27 is fixed to the seat back 4 and the cam plate 28 is merely fixed to the seat cushion 3. As a result, the number of parts can be reduced, the structure can be simplified, and the cost can be reduced. In the above embodiment, the case where the seat back is divided into two parts, left and right, has been described. However, the present invention can of course be applied to a left and right integrated seat back.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing an operation of a seat back for explaining an automobile seat device according to an embodiment of the present invention. FIG. 2 is a side view showing an engagement state between an engagement piece and a cam plate of the seat device. 3 is a sectional rear view of a hinge plate portion of the seat device (a sectional view taken along line III-III in FIG. 2). FIG. 4 is a perspective view of the hinge plate. FIG. 5 is a schematic perspective view of the seat back. FIG. 6 is a side view of a conventional general sheet device. DESCRIPTION OF SYMBOLS 1 Seat device 2 Floor 3 Seat cushion 3b Side wall 4 Seat back 4b Side wall 10 Hinge plate 10a Lower end 10b Upper end 12 First hinge member 13 Second hinge member 27 Engagement piece 28 Cam plate

Claims (1)

(57) [Claim 1] An automobile seat apparatus comprising: a seat cushion disposed on a floor; and a seat back disposed on the seat cushion so as to be able to lean forward. The lower end of the hinge plate on the side wall of the first
The seat cushion is rotatably supported by a hinge member, a side wall of the seat back is rotatably supported by a second hinge member on an upper end portion of the hinge plate, and an engagement piece is disposed on the seat back. In addition, when the engaging pieces come into contact with each other, rotation in the forward direction around the second hinge member is restricted, and rotation in the forward direction around the first hinge member is allowed. A seat device for an automobile, wherein a cam plate is provided.