JP6602815B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat, and more particularly to a vehicle seat suitable for use in a rear hatch type automobile that enables a wheelchair to be rolled up by a winch.

  A so-called dive down seat is known as a vehicle seat. This seat is connected at least to the forward-facing seat cushion with the lower end connected to the floor of the vehicle, and is pivotably connected to the rear end of the seat cushion so that it can be folded when seated on the seat cushion. And a seat back. The seat can store the seat back and the seat cushion on a low floor surface by, for example, moving the seat cushion forward by folding the seat back.

  In addition, a vehicle is known in which a rear row seat is accommodated in a vehicle seat to secure a space, and a wheelchair can be loaded in a luggage room located behind the vehicle seat.

  Furthermore, as shown in Patent Document 1, a seat back frame used for a vehicle seat includes a pair of side frames, a substantially inverted U-shaped upper frame, and a lower frame. An example is described in which the upper end portion is connected to the upper frame and the lower end portion is connected to the lower frame to form a rectangular shape.

JP, 2006-107881, A

  In the vehicle seat described in Patent Document 1, the lower frame of the seat back frame is a cylindrical or columnar frame. In the case of a cylindrical shape, the weight can be reduced, but there is a limit to improving the rigidity. In the case of a cylindrical shape, the rigidity can be improved by increasing the diameter, but there is a limit to the reduction in size and weight.

  The present invention has been made in consideration of such problems, and an object of the present invention is to provide a vehicle seat capable of improving rigidity while achieving reduction in size and weight.

[1] A vehicle seat according to the present invention includes a seat back frame having at least an inverted U-shaped pipe frame extending along the outer shape of the seat back and a lower frame stretched under the pipe frame. The lower frame includes a first lower frame and a second lower frame, and the first lower frame and the second lower frame overlap each other in the front-rear direction of the seat back frame, Both the first lower frame and the second lower frame have an open sectional structure, and the lower frame has a closed sectional structure in which a space is provided between the first lower frame and the second lower frame, The first lower frame has a first side wall extending in the front-rear direction on the second lower frame side, and the second lower frame is formed in the front-rear direction on the first lower frame side. The lower frame is formed by joining the first side wall of the first lower frame and the second side wall of the second lower frame so as to overlap each other in the vertical direction. and said that you are. Thereby, the rigidity can be improved while reducing the size and weight.

[2] In the present invention, of the first lower frame and the second lower frame, a frame located near the front surface of the seat back has a shorter vertical length than a vertical length of other frames. It is preferable that they are formed within the upper and lower widths.

When the occupant sits on the vehicle seat, a frame with a short vertical length (for example, the first lower frame) hits the occupant's waist through the cushion (pad), reducing the feeling of pressure, The ride comfort of the passenger can be improved. That is, the ride comfort of the occupant can be improved while reducing the size and weight.

[3] In the present invention, the first lower frame is positioned closer to the front surface of the seat back than the second lower frame, and the first side wall includes a first upper side wall and a first lower side wall. The second side wall includes a second upper side wall and a second lower side wall, and an upper surface of the first upper side wall and a lower surface of the second upper side wall are overlapped, and the lower surface of the first lower side wall and the second side wall 2 It is preferable to join in a state where the upper surface of the lower side wall is overlapped.

[4] In the present invention, the seat back frame further includes a pan frame fixed so as to partially close a space surrounded by the pipe frame, and the lower frame includes the first lower frame and the first lower frame. It is preferable that a portion overlapping the pan frame is present in an upper portion facing the second lower frame in the front-rear direction.

[5] In the present invention, of the first lower frame and the second lower frame, a frame located closer to the front surface of the seat back is located at a portion facing the other member inserted inside the seat back. A step that is deformed in a direction away from the other member may be provided.

When the other member is, for example, a headrest stay, the stay hardly contacts the frame even if the stay vibrates or swings while an occupant is seated on the vehicle seat. As a result, vibration and abnormal noise due to the stay coming into contact with the frame are almost eliminated, and passenger comfort can be improved. In addition, since the strength of the frame can be improved by forming the step, it is not necessary to increase the thickness of the frame in order to improve the strength. That is, it is possible to improve the rigidity and the ride comfort of the occupant while reducing the size and weight.

[6] In the present invention, of the first lower frame and the second lower frame, a frame located closer to the front surface of the seat back includes a left side portion and a right side portion corresponding to the left-right direction of the seat back, and these A central portion located between the left side portion and the right side portion, and the central portion forms a plane located rearward of the left side portion and the right side portion.

Riding comfort can be given to support the waist of the occupant from around. That is, it is possible to improve the riding comfort of the occupant while reducing the size and weight.

[7] In the present invention, the lower frame is disposed at a position facing the waist of an occupant, and the frame located closer to the front surface of the seat back, of the first lower frame and the second lower frame, It is preferable that a step which is deformed in a direction away from the stay of the headrest is provided in a portion facing the stay of the headrest inserted into the seat back.

  According to the vehicle seat of the present invention, it is possible to improve the ride comfort of the occupant while reducing the size and weight.

It is a perspective view which shows the external appearance of the vehicle seat which concerns on this Embodiment. 2A is a side view showing a state in which the vehicle seat is erected (“seat seating state”), and FIG. 2B is a side view showing a state in which the vehicle seat is tilted forward (“seat retracted state”). is there. It is a perspective view which shows the state which removed the front skin material of the seat back, the back skin material, and the pad among vehicle seats. It is a perspective view which shows the front side upper part of a seat back frame. It is a front view which abbreviate | omits and shows the part in which the lower frame was installed among vehicle seats. 6A is a perspective view showing a cross-sectional shape on line VI-VI in FIG. 5, and FIG. 6B is a cross-sectional view on line VI-VI in FIG.

  Hereinafter, an embodiment of a vehicle seat according to the present invention will be described with reference to FIGS. 1 to 6B.

  As shown in FIG. 1, the vehicle seat 10 according to the present embodiment includes a front leg 12, a rear leg 14, a seat cushion 16, a seat back 18, an arm 20, and a headrest 21.

  As shown in FIGS. 2A and 2B, the vehicle seat 10 is in a “seat seating state” in which the seat cushion 16 is disposed above the floor 24 of the vehicle 22 (see FIG. 2A), and the rear leg 14 is rotated forward. The seat cushion 16 is disposed above the floor 24, the seat back 18 is overlaid on the seat cushion 16, and the back of the seat back 18 is the upper surface, as shown in FIG. 2B. It is possible to move between.

  The front leg 12 supports the seat cushion 16 from below in the “seat seating state” and is rotatable forward about the first shaft portion 26a and the second shaft portion 26b.

  The rear leg 14 is fixed to the seat back 18 and is rotatable forward about the third shaft portion 26c. The lower end of the rear leg 14 is attached to a foot bracket 30 (see FIGS. 2A and 2B) fixed to the floor 24, and the upper end of the rear leg 14 is fixed to the seat back 18. In addition, in FIG.1 and FIG.3, illustration of the foot bracket 30 is abbreviate | omitted.

  The upper end of the front leg 12 is attached to the front bottom surface of the seat cushion 16 via the second shaft portion 26b, and the rear end of the seat cushion 16 is attached to the seat back 18 via the L-shaped arm 20. Yes. The rear end of the seat cushion 16 is rotatably connected to the lower end of the seat back 18 via the arm 20.

  The seat back 18 has a lower end fixed to the upper end of the rear leg 14 in the “seat seating state”, and can be rotated forward about the third shaft portion 26c.

  The arm 20 is fixed to the seat cushion 16, and the upper end thereof is attached to the lower end of the seat back 18 via the fourth shaft portion 26d. The seat back 18 can be rotated forward about the fourth shaft portion 26d.

  In the above-described “seat retracted state” shown in FIG. 2B, the front leg 12 pivots forward about the first shaft portion 26a, and the rear leg 14 pivots forward about the third shaft portion 26c. To do. That is, the front leg 12 and the seat cushion 16 are configured to be foldable with the above-described rotation.

  Further, since the rear end of the seat cushion 16 is connected to the seat back 18 via the arm 20, it moves forward and downward as the rear leg 14 rotates. The seat back 18 rotates forward about the fourth shaft portion 26d.

  That is, when the vehicle seat 10 is brought into the “seat retracted state” described above, the seat cushion 16 moves substantially in parallel toward the recess 24 a of the floor 24. When the vehicle seat 10 is housed in the recess 24a of the floor 24, the front surface of the seat back 18 and the upper surface of the seat cushion 16 are opposed to each other, and the back surface of the seat back 18 is substantially horizontal.

  When a wheelchair (not shown) is pulled into the vehicle compartment, for example, the belt 36 is pulled out from the electric winch 34 at the bottom of the front seat 32 installed on the front side of the vehicle seat 10 and attached to the end of the belt 36. The electric winch 34 is driven after the heel (not shown) is hooked on the leg of the wheelchair.

  Here, the configuration of the vehicle seat 10, particularly the configuration of the seat back 18, will be described with reference to FIGS. 3 to 6B.

  FIG. 3 is a perspective view showing a state where the seat cushion 16 of the vehicle seat 10 and the skin material (not shown) and the pad (not shown) of the seat back 18 are removed.

  As shown in FIG. 3, the seat back 18 has at least a metal seat back frame 40. The seat back frame 40 includes an inverted U-shaped metal pipe frame 42 along the outer shape of the seat back 18 and a metal pan fixed so as to partially close a space surrounded by the pipe frame 42. The frame 44 and a metal lower frame 46 stretched under the pipe frame 42 are provided. The lower portion of the pipe frame 42 is a portion that faces the occupant's waist when the occupant sits on the vehicle seat 10.

  The pipe frame 42, the pan frame 44, and the lower frame 46 may be made of the same material, or may be made of different materials. Of course, the pan frame 44 and the lower frame 46 may be made of the same material, and the pipe frame 42 may be made of different materials.

  The pan frame 44 is fixed to the pipe frame 42 by, for example, welding, and the lower frame 46 is fixed to the pipe frame 42 by, for example, welding. Of course, the lower frame 46 may also be fixed to the pan frame 44 by welding, for example.

  As shown in FIG. 4, a pair of headrest guides 52 into which a pair of stays 50 (see FIG. 3) of the headrest 21 are inserted is fixed to the upper portion of the pipe frame 42 by, for example, welding.

  As shown in FIGS. 5, 6A and 6B, the lower frame 46 includes a first lower frame 46A positioned in the front and rear direction of the seat back frame 40 and a second lower frame 46B positioned rearward. With. That is, the first lower frame 46A and the second lower frame 46B overlap in the front-rear direction of the seat back frame 40. The first lower frame 46A and the second lower frame 46B are each formed with a raised portion, a concave portion or the like for ensuring strength.

  As shown in FIGS. 6A and 6B, the first lower frame 46A and the second lower frame 46B both have an open cross-sectional structure formed in a substantially U-shape, and the lower frame 46 includes the first lower frame 46A and the first lower frame 46A. It is a closed cross-sectional structure in which a space is provided between the second lower frame 46B.

  That is, the first lower frame 46A has a first upper side wall 54a and a first lower side wall 54b that extend toward the second lower frame 46B at the upper and lower portions. The second lower frame 46B includes a second upper side wall 56a and a second lower side wall 56b that extend toward the first lower frame 46A at the upper and lower portions.

  The lower frame 46 is formed by joining, for example, by welding or the like in a state where the side wall of the first lower frame 46A and the side wall of the second lower frame 46B are overlapped. That is, the first lower frame 46A and the second lower frame 46B are opposed to each other with a space therebetween.

  By adopting such a configuration, it is possible to improve the rigidity while reducing the size and weight of the lower frame 46 and thus the seat back frame 40.

  In particular, in the present embodiment, as shown in FIG. 6B, the vertical length La of the first lower frame 46A is shorter than the vertical length Lb of the second lower frame 46B (La <Lb).

  Accordingly, in the lower frame 46, the outer surface of the first upper side wall 54a of the first lower frame 46A and the inner surface of the second upper side wall 56a of the second lower frame 46B are preferably overlapped, and the first frame of the first lower frame 46A is overlapped. The outer surface of the lower side wall 54b and the inner surface of the second lower side wall 56b of the second lower frame 46B are joined and overlapped.

  As a result, when the occupant sits on the vehicle seat 10, the frame having a short vertical length (in this case, the first lower frame 46 </ b> A) hits the occupant's waist through the cushion (pad). The feeling of pressure can be reduced and the ride comfort of the occupant can be improved. That is, the ride comfort of the occupant can be improved while reducing the size and weight.

  Further, the lower frame 46 has a portion overlapping the pan frame 44 at a portion where the first lower frame 46A and the second lower frame 46B face each other in the front-rear direction. That is, for example, as shown in FIGS. 6A and 6B, the pan frame 44 is joined to the rear side surface of the second lower frame 46 </ b> B in the portion indicated by the alternate long and short dash line frame W. As a result, the rigidity of the lower frame 46 and, consequently, the seat back frame 40 can be improved while reducing the size and weight.

  Further, as shown in FIGS. 5, 6A, and 6B, the first lower frame 46A is opposed to other members (a pair of stays 50 of the headrest 21 in the present embodiment) inserted into the seat back 18. A step 58 that is deformed in a direction away from the stay 50 is provided in the portion to be moved.

  In this case, even if the stay 50 vibrates or swings while an occupant is seated on the vehicle seat 10, the stay 50 hardly comes into contact with the lower frame 46. Therefore, the occurrence of vibration and abnormal noise due to the stay 50 coming into contact with the lower frame 46 is almost eliminated, and the ride comfort of the occupant can be improved. Moreover, since the strength of the lower frame 46 can be improved by forming the step 58, it is not necessary to increase the thickness of the lower frame 46 in order to improve the strength. That is, it is possible to improve the rigidity and the ride comfort of the occupant while reducing the size and weight.

  Further, as shown in FIG. 5, the first lower frame 46A is provided between the left side 60L and the right side 60R corresponding to the left-right direction of the seat back 18 (see FIG. 1), and between the left side 60L and the right side 60R. The central portion 60C is located behind the left side portion 60L and the right side portion 60R. That is, the central portion 60C is processed into a shape that is recessed rearward.

  As a result, it is possible to provide a riding comfort that supports the waist portion of the occupant from around. That is, it is possible to improve the riding comfort of the occupant while reducing the size and weight.

  As shown in FIG. 5, the first lower frame 46A has a circular through hole 62 for weight reduction, for example, by punching, and positioning of welding between the first lower frame 46A and the second lower frame 46B. A small hole 64 to be used is formed.

  In addition, the vehicle seat according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Vehicle seat 18 ... Seat back 21 ... Headrest 40 ... Seat back frame 42 ... Pipe frame 44 ... Pan frame 46 ... Lower frame 46A ... 1st lower frame 46B ... 2nd lower frame 50 ... Stay 54a of a pair of headrest ... 1st upper side wall 54b ... 1st lower side wall 56a ... 2nd upper side wall 56b ... 2nd lower side wall 58 ... Level difference 60C ... Center part 60L ... Left side part 60R ... Right side part

Claims (7)

A vehicle seat having a seat back frame having an inverted U-shaped pipe frame at least along the outer shape of the seat back and a lower frame stretched under the pipe frame,
The lower frame includes a first lower frame and a second lower frame,
The first lower frame and the second lower frame overlap in the front-rear direction of the seat back frame;
The first lower frame and the second lower frame are both open cross-sectional structures,
The lower frame has a closed cross-sectional structure in which a space is provided between the first lower frame and the second lower frame;
The first lower frame has a first side wall extending in the front-rear direction on the second lower frame side,
The second lower frame has a second side wall extending in the front-rear direction on the first lower frame side,
The lower frame is configured by joining the first side wall of the first lower frame and the second side wall of the second lower frame so as to be overlapped in the vertical direction. Sheet. The vehicle seat according to claim 1,
Of the first lower frame and the second lower frame, the vertical length of the frame located closer to the front surface of the seat back is shorter than the vertical length of the other frames, and is formed within the vertical width. A vehicle seat characterized by being made. The vehicle seat according to claim 2,
The first lower frame is located closer to the front surface of the seat back than the second lower frame;
The first sidewall has a first upper sidewall and a first lower sidewall,
The second side wall has a second upper side wall and a second lower side wall,
The vehicle according to claim 1, wherein the upper surface of the first upper side wall and the lower surface of the second upper side wall are overlapped, and the lower surface of the first lower side wall and the upper surface of the second lower side wall are overlapped. Sheet. The vehicle seat according to claim 1,
The seat back frame further includes a pan frame fixed so as to partially close a space surrounded by the pipe frame,
The vehicle seat according to claim 1, wherein the lower frame has a portion overlapping the pan frame at an upper portion where the first lower frame and the second lower frame are opposed in the front-rear direction. The vehicle seat according to claim 1,
Of the first lower frame and the second lower frame, a frame located closer to the front surface of the seat back moves away from the other member to a portion facing the other member inserted into the seat back. A vehicle seat characterized in that a step which is deformed in a direction is provided. The vehicle seat according to claim 1,
Of the first lower frame and the second lower frame, a frame located closer to the front surface of the seat back is between a left side and a right side corresponding to the left and right direction of the seat back, and between the left side and the right side. And a central portion located at
The vehicle seat according to claim 1, wherein the central portion forms a flat surface located behind the left side portion and the right side portion. The vehicle seat according to claim 1,
The lower frame is disposed at a position facing the occupant's waist,
Of the first lower frame and the second lower frame, a frame located closer to the front surface of the seat back is opposed to a head rest stay inserted into the seat back with respect to the head rest stay. A vehicle seat characterized in that a step which is deformed in a direction away from the vehicle is provided.

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