JP5589833B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat.

In a vehicle seat, it is known that a back frame of a seat back includes a lower frame and an upper frame connected to an upper portion of the lower frame so as to be bent in the front-rear direction. Yes.
A vehicle seat provided with such a folding seat back is disclosed in Patent Document 1, for example.
In this case, the upper frame of the back frame of the seat back is supported on the rear vertical wall portion of the vehicle body panel by the link mechanism.
Further, the lower frame of the back frame is rotatably supported via a hinge pin on a hinge bracket whose lower part is fixed to the lower side of the rear vertical wall portion of the vehicle body panel, and the upper frame is supported by a long hole and a pin. It is connected to the lower part.
And by the rotation of the motor in the positive direction, the upper frame of the back frame is moved in a direction approaching the rear vertical wall portion of the vehicle body panel, so that the lower frame rotates backward (clockwise direction) with the hinge pin as a fulcrum, As a result, the seat back is in a folded state and in a reclining state.

JP 2002-345589 A

By the way, in the vehicle seat disclosed in Patent Document 1, as the upper frame of the back frame approaches the rear vertical wall portion of the vehicle body panel, the amount of tilting toward the rear of the lower frame increases.
In addition, because of the structure in which a link mechanism and a motor are disposed between the upper frame and rear side of the back frame of the seat back and the rear vertical wall portion of the vehicle body panel, the lower frame of the seat back is brought down to a flat state ( It cannot be tilted horizontally behind the seat cushion.
If the rear vertical wall of the vehicle body panel is set at an angle approaching the floor panel so that the lower frame of the seat back can be brought down into a flat state, the lower frame of the seat back is assumed to be arranged in a flat position. The upper frame will be bent too much, making it unusable.

  In view of the above problems, an object of the present invention is to gradually increase the amount of folding of the upper frame (the amount of middle folding) from the normal use position toward the rearward tilted position where the seatback is rotated backward by a set angle. It is possible to provide a vehicle seat that can gradually reduce the amount of folding of the upper frame toward a flat position that is further tilted backward from the rearward tilt position, and can improve usability.

In order to solve the above-mentioned problem, a vehicle seat according to claim 1 of the present invention includes a seat cushion and a seat back disposed at a rear portion of the seat cushion so as to be tiltable by a reclining mechanism. Because
The back frame of the seat back includes a lower frame connected to a rear portion of the cushion frame of the seat cushion, and an upper frame connected to an upper portion of the lower frame so as to be bent in the front-rear direction, and is a folding type. Configured,
Between the cushion frame and the upper frame of the back frame, a long interlocking link having both ends rotatably connected to both frames is disposed.
From the normal use position of the seat back to the rearward tilt position where the center line connecting the rotation centers of both ends of the interlocking link is located on the connection center between the rear part of the cushion frame and the lower frame of the back frame. The folding amount of the upper frame with respect to the lower frame gradually increases, and the folding amount of the upper frame with respect to the lower frame toward the flat position where the seat back is further tilted rearward from the rearward tilt position. A structure that interlocks to gradually become smaller ,
A base member fixed on the floor is disposed on both side portions of the seat cushion,
The seat back is supported by the base member so as to be rotatable about a support shaft at an intermediate height position of the lower frame,
The seat cushion is supported by the guide member so as to be movable in the vertical direction and the front-rear direction on the base member,
When the seat back is switched from the state in which the seat back is disposed at the normal use position to the lift position inclined forward, the lower frame of the seat back is rotated around the support shaft with respect to the base member. Thus, the seat cushion is moved and guided downward by the guide mechanism while the seat cushion is moved rearward in conjunction with this .

According to the above configuration, from the normal use position of the seat back to the rearward tilt position where the center line connecting the rotation centers of both ends of the interlocking link is located on the connection center between the rear portion of the cushion frame and the lower frame of the back frame. In the meantime, the folding amount (middle folding amount) of the upper frame is gradually increased by the interlocking link with the backward tilting operation of the lower frame of the seat back. For this reason, a seated person's back part is favorably supported by the upper frame folded halfway, and, thereby, a seated person can be in a comfortable posture.
In addition, when the lower frame of the seat back is tilted further rearward from the rearward tilt position, the lower frame of the seatback is tilted backward toward the flat position (the position extending horizontally behind the seat cushion to form a horizontal shape). Accordingly, the amount of folding of the upper frame is gradually reduced by the interlocking link and returned. For this reason, it extends to the back of a seat cushion, and makes a full flat state where a seat back makes a horizontal shape. As a result, usability can be improved.
Further, when the seat back is switched from the state in which the seat back is disposed at the normal use position to the lifted position inclined forward, the lower frame of the seat back is rotated about the support shaft with respect to the base member. Then, the seat cushion is moved and guided downward by the guide mechanism while being moved backward with respect to the base member.
As a result, the height of the seat cushion is reduced, so that the seat cushion can be lifted and lowered in an easy posture.

The vehicle seat according to claim 2 is the vehicle seat according to claim 1 ,
The guide mechanism is a long hole-shaped guide hole formed in one member of the base member and the cushion frame, and is disposed in the other member, and is slid along the guide hole, thereby And a sliding body that moves the cushion frame up and down and back and forth.

  According to the said structure, since a guide mechanism can be comprised with the simple structure by a long hole-shaped guide hole and a sliding body, an effect is large at cost reduction.

It is a perspective view which shows the assembly | attachment state of each flame | frame with the seat back and seat cushion of the vehicle seat which concerns on Example 1 of this invention. It is a side view which shows the state by which the seat back was similarly arrange | positioned in the normal use position. FIG. 6 is a side view showing a state where the seatback is similarly disposed at a rearward tilt position and the folding amount (the amount of middle folding) of the upper frame with respect to the lower frame of the seatback is maximized. It is a side view which shows the state arrange | positioned in the full flat position where the seat back extends horizontally behind the seat cushion and forms a horizontal shape. It is a perspective view which shows the assembly | attachment state of each frame of the base member of the vehicle seat which concerns on Example 2 of this invention, a seat back, and a seat cushion. It is a side view which shows the state by which the seat back was similarly arrange | positioned in the normal use position. FIG. 6 is a side view showing a state where the seatback is similarly disposed at a rearward tilt position and the folding amount (the amount of middle folding) of the upper frame with respect to the lower frame of the seatback is maximized. It is a side view which shows the state arrange | positioned in the full flat position where the seat back extends horizontally behind the seat cushion and forms a horizontal shape. It is a side view showing a state where the seat back is also tilted forward and the front portion of the seat cushion is tilted forward.

  A mode for carrying out the present invention will be described according to an embodiment.

A first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the vehicle seat includes a seat back 20 and a seat cushion 40.
The cushion frame 41 that forms the skeleton of the seat cushion 40 includes left and right side frame portions 43 and a front frame portion 42 having both ends connected to the front portions of the side frame portions 43.
In the first embodiment, the seat cushion 40 is fixed to the floor panel (vehicle body panel), can be slid by a slide rail mechanism, or can be turned by a turning mechanism.

The back frame 21 that forms the skeleton part of the seat back 20 can be bent in the front-rear direction by both upper left and right upper frames 22 having upper ends connected by an upper frame portion 23 and a lower portion of the upper frame 22 by connecting pins 25. And left and right lower frames 26 connected to each other.
The seat back 20 is attached to the rear portions of the left and right side frame portions 43 of the seat cushion 40 so as to be adjustable in inclination by the reclining mechanism 30 below the left and right lower frames 26.
As is well known, the reclining mechanism 30 is configured such that a lock mechanism is interposed between a disc-like member fixed on the seat cushion 40 side and a disc-like member fixed on the seat back 20 side. . The lock mechanism is unlocked by operation of the operation unit, and can be adjusted to a desired tilt angle.

Between the left and right side frame portions 43 of the cushion frame 41 and the left and right upper frames 22 of the back frame 21, both ends of these frames are connected to each other by connecting pins 72 and 73 so as to be rotatable. The interlocking link 71 is provided.
In the first embodiment, a connecting portion 45 that protrudes downward is formed at a portion of the left and right side frame portions 43 of the cushion frame 41 that is positioned in front of the reclining mechanism 30. On the other hand, the left and right upper frames 22 of the back frame 21 of the back frame 21 are formed in a dogleg shape that bends forward in the middle in the height direction.
The upper end portion of the interlocking link 71 is rotatably connected to the bent portion of the upper frame 22 by the connecting pin 72, and the lower end portion of the interlocking link 71 is connected to the left and right side frame portions of the cushion frame 41 by the connecting pin 73. 43 is connected to a connecting portion 45 in a rotatable manner.

That is, as shown in FIG. 2, in the state where the seat back 20 is disposed at the normal use position (angle position slightly tilted rearward), the rotation centers (the connection pins 72 and 73) at both ends of the interlocking link 71. A center line L connecting the centers of the left and right side frame parts 43 of the cushion frame 41 and the lower part of the lower frame 26 of the back frame 21 is positioned forward of the connection center (reclining center P).
Further, as shown in FIG. 3, the folding amount of the upper frame 22 with respect to the lower frame 26 gradually increases from the normal use position toward the rearward tilt position where the center line L is located on the reclining center P, as shown in FIG. growing.
Further, as shown in FIG. 4, the seatback 20 is interlocked so that the folding amount of the upper frame 22 with respect to the lower frame 26 gradually decreases from the rearward tilt position toward the flat position where the seat back 20 is horizontally tilted backward. It is configured.

The vehicle seat according to the first embodiment is configured as described above.
Therefore, when the seat back 20 is between the normal use position shown in FIG. 2 and the rearward tilt position shown in FIG. 3, the interlocking link is accompanied by the backward tilting operation (reclining operation) of the lower frame 26 of the seatback 20. By 71, the amount of folding (the amount of middle folding) of the upper frame 22 gradually increases. For this reason, a seated person's back part is favorably supported by the upper frame 22 bent halfway, and, thereby, a seated person can be in a comfortable posture.

  Further, when the lower frame 26 of the seat back 20 is tilted from the rearward inclined position shown in FIG. 3 toward the flat position shown in FIG. 4 (a position extending horizontally behind the seat cushion 40 and forming a horizontal shape). The folding amount of the upper frame 22 is gradually reduced by the interlocking link 71 in association with the backward tilting operation (reclining operation) of the lower frame 26 of the seat back 20. In this way, since the middle fold of the upper frame 22 with respect to the lower frame 26 is returned, the seat back 20 extends to the rear of the seat cushion 40 and forms a full flat state in which the seat back 20 forms a horizontal shape. As a result, usability can be improved.

Next, a second embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 5, the vehicle seat according to the second embodiment includes a base member 10, a seat back 20, and a seat cushion 40.
The base member 10 includes a fixed bracket 11 that is fixed to the floor panel in a pair of left and right. The base member 10 has an armrest 12 at the top.

  The seat back 20 is supported at the middle height position of the lower frame 26 at the rear upper part of the fixed bracket 11 of the base member 10 so as to be rotatable in the front-rear direction around the support shaft 15. On the other hand, the seat cushion 40 is supported on the fixed bracket 11 of the base member 10 by the guide mechanism 60 so as to be movable in the vertical direction and the front-rear direction.

The guide mechanism 60 includes a sliding body (pin, roller, etc.) 61 and a long hole-shaped guide hole 66. The sliding body 61 protrudes horizontally from the outer surface of the middle portion in the front-rear direction of the left and right front frame portions 42 of the seat cushion 40.
The guide hole 66 is formed in the fixed bracket portion 11 of the base member 10 and slides and guides the sliding body 61 to move the front portion of the seat cushion 40 up and down.
In the first embodiment, the guide hole 66 is formed in an S-shape that is gently inclined in the front-rear direction.
Then, as shown in FIG. 6, when the seat back 20 is placed in the normal use position and switched to the lifted position inclined forward as shown in the figure, the bracket for fixing the base member 10 is fixed. 11, the lower frame 26 of the seat back 20 is rotated about the support shaft 15, and the seat cushion 40 is moved by the sliding body 61 and the guide hole 66 while the seat cushion 40 is moved backward in conjunction with this. The guide mechanism 60 is configured to be guided to move downward.
Since the other configuration of the second embodiment is configured in the same manner as the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

The vehicle seat according to the second embodiment is configured as described above.
Therefore, when the seat back 20 is reclined, the lower frame 26 of the seat back 20 is rotated about the support shaft 15 with respect to the base member 10.
6 from the normal use position shown in FIG. 6 to the rearward tilt position shown in FIG. 7, that is, the center line L connecting the rotation centers of both ends of the interlocking link 71 is the left and right side frame portions of the cushion frame 41. Between the rear portion of 43 and the lower portion of the lower frame 26 of the back frame 21 until the rearward tilt position located on the reclining center P, the lower frame 26 of the seat back 20 is tilted backward (reclining operation). Accordingly, the amount of folding (the amount of middle folding) of the upper frame 22 gradually increases by the interlocking link 71.
In addition, the seat cushion 40 is attached to the rear portion of the cushion frame 41 (the reclining which is a connecting portion with the lower frame 26) along with the backward tilting operation (reclining operation) about the support shaft 15 of the lower frame 26 of the seat back 20. While the mechanism 30) is moved forward, the front portion of the seat cushion 40 is moved and guided upward by the guide action of the sliding body 61 and the guide hole 66 of the guide mechanism 60.
For this reason, the seat occupant's back is satisfactorily supported by the folded upper frame 22, and the seat occupant's leg is favorably supported by the seat cushion 40 whose front is moved upward. Can be comfortable.

Further, when the lower frame 26 of the seat back 20 is tilted from the rearward tilt position shown in FIG. 7 toward the flat position shown in FIG. 8 at the rear (position extending to the rear of the seat cushion 40 and forming a horizontal shape). The folding amount of the upper frame 22 is gradually reduced by the interlocking link 71 in association with the backward tilting operation (reclining operation) of the lower frame 26 of the seat back 20.
The seat cushion 40 is guided to move upward and obliquely by the guide action of the sliding body 61 and the guide hole 66 of the guide mechanism 60 while the rear portion of the cushion frame 41 is further moved forward and upward. Is done. And the whole seat cushion 40 will be in the state raised to the predetermined height position.
As described above, the folding of the upper frame 22 with respect to the lower frame 26 of the seat back 20 is returned and the entire seat cushion 40 is lifted up to a predetermined height position. As a result, the seat back 20 is in a fully flat state in which it is horizontal. As a result, usability can be improved.

Further, when the seat back 20 is switched from the state in which the seat back 20 is disposed at the normal use position illustrated in FIG. 6 to the lift position inclined forward as illustrated in FIG. 9, the seat back 20 is moved with respect to the base member 10. The lower frame 26 is rotated counterclockwise about the support shaft 15 toward FIG.
Then, the cushion frame 41 is moved and guided downward by the guide mechanism 60 while being moved backward with respect to the base member 10.
As a result, the height of the seat cushion 40 is lowered, so that even a vehicle in which the height of the ceiling surface of the passenger compartment is restricted can be lifted and lowered in an easy posture.
Note that the amount of folding of the upper frame 22 with respect to the lower frame 26 is gradually reduced by the interlocking link 71 as the lower frame 26 of the seat back 20 is tilted forward (reclining operation).

  Further, in the second embodiment, the guide mechanism 60 can be simply configured by the long hole-shaped guide hole 66 and the sliding body 61 such as a pin, so that the effect of cost reduction is great.

In addition, this invention is not limited to the said Example 1 and 2, In the range which does not deviate from the summary of this invention, it can also be implemented with a various form.
For example, in the second embodiment, the long hole-shaped guide hole 66 constituting the guide mechanism 60 is arranged in the fixed bracket 11 of the base member 10 and the sliding body 61 is arranged in the cushion frame 41. In addition, the elongated guide hole 66 may be disposed in the cushion frame 41, and the sliding body 61 may be disposed in the fixed bracket 11 of the base member 10.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 10 Base member 20 Seat back 21 Back frame 22 Upper frame 26 Lower frame 30 Reclining mechanism 40 Seat cushion 41 Cushion frame 60 Guide mechanism 61 Slide body 66 Guide hole 71 Interlock link 72, 73 Connecting pin

Claims (2)

A vehicle seat comprising a seat cushion and a seat back arranged to be tiltable by a reclining mechanism at the rear of the seat cushion,
The back frame of the seat back includes a lower frame connected to a rear portion of the cushion frame of the seat cushion, and an upper frame connected to an upper portion of the lower frame so as to be bent in the front-rear direction, and is a folding type. Configured,
Between the cushion frame and the upper frame of the back frame, a long interlocking link having both ends rotatably connected to both frames is disposed.
From the normal use position of the seat back to the rearward tilt position where the center line connecting the rotation centers of both ends of the interlocking link is located on the connection center between the rear part of the cushion frame and the lower frame of the back frame. The folding amount of the upper frame with respect to the lower frame gradually increases, and the folding amount of the upper frame with respect to the lower frame toward the flat position where the seat back is further tilted rearward from the rearward tilt position. A structure that interlocks to gradually become smaller ,
A base member fixed on the floor is disposed on both side portions of the seat cushion,
The seat back is supported by the base member so as to be rotatable about a support shaft at an intermediate height position of the lower frame,
The seat cushion is supported by the guide member so as to be movable in the vertical direction and the front-rear direction on the base member,
When the seat back is switched from the state in which the seat back is disposed at the normal use position to the lift position inclined forward, the lower frame of the seat back is rotated around the support shaft with respect to the base member. Thus, the vehicle seat is configured such that the seat cushion is moved and guided downward by the guide mechanism while the seat cushion is moved rearward in conjunction therewith. The vehicle seat according to claim 1 ,
The guide mechanism is a long hole-shaped guide hole formed in one member of the base member and the cushion frame, and is disposed in the other member, and is slid along the guide hole, thereby A vehicular seat comprising a sliding body that moves the cushion frame up and down and back and forth.

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