WO2019039351A1

WO2019039351A1 - Articulated seat back

Info

Publication number: WO2019039351A1
Application number: PCT/JP2018/030260
Authority: WO
Inventors: 和大三柴; 治希望月; 和也宮脇
Original assignee: テイ・エステック株式会社
Priority date: 2017-08-23
Filing date: 2018-08-14
Publication date: 2019-02-28
Also published as: JP7022271B2; JP2019038340A

Abstract

[Problem] To provide an articulated seat back with a structure for determining the pivoting range of upper side frames with respect to lower side frames. [Solution] The present invention comprises: a pair of left and right lower side frames (6) extending in the vertical direction; a pair of left and right upper side frames (7) mounted on the upper ends of the lower side frames so as to be pivotable about a pivoting axis (X) extending from left to right; and an upper frame (5) connecting the upper side frames to each other. The lower side frames and the upper side frames have stoppers (6ED, 6FD, 7B, 7C), which abut against each other and thereby determine the pivoting range of the upper side frames with respect to the lower side frames.

Description

Folded seat back

The present invention relates to a foldable seat back whose upper portion can be tilted in the front-rear direction with respect to the lower portion of the seat back frame divided in the vertical direction.

The seatback upper portion is disposed at the lower portion of the seatback and above the lower portion of the seatback as a center-folded seatback of a vehicle seat, and rotatably attached to the lower portion of the seatback about a shaft member along the seat width direction. And a drive source for rotating the upper portion of the seatback relative to the lower portion of the seatback, and a rotation (folding) mechanism for rotating the upper portion of the seatback relative to the lower portion of the seatback under the driving force of the drive source. Is known (see, for example, Patent Document 1).

The center-folded seat back of Patent Document 1 includes a pair of left and right seat back lower frames (lower side frames) serving as a framework of the seat back lower portion and a pair of left and right seat back upper frames (upper side frames) serving as a framework of the seat back upper portion And. Each upper side frame is rotatably coupled to the corresponding lower side frame via a shaft.

A motor mounting plate is stretched around the pair of lower side frames, and a motor serving as a driving source is mounted on the motor support plate. On each lower side frame, a rotary drum for rotatably receiving an external thread under the rotational driving force of a motor is rotatably attached, and to each upper side frame, a lifting block on which a corresponding external thread is screwed is rotatably attached. It is done. When the male screw is screwed into the elevating block by driving the motor, the upper side frame rotates around the shaft with respect to the lower side frame.

JP, 2010-42748, A

In the center-folded seat back of Patent Document 1, since the rotation range of the upper side frame is determined by driving the motor, there is a problem that the rotation range of the upper side frame can not be easily determined.

In view of such a background, the present invention has an object to provide a structure capable of easily determining the pivoting range of the upper side frame with respect to the lower side frame in the center-folded seat back.

In order to solve such problems, a pair of left and right lower side frames (6) extending in the vertical direction, and a rotation axis (X) extending in the left and right directions at the respective upper end portions of the lower side frames A pair of left and right upper side frames (7) which are movably attached and an upper frame (5) connecting each of the upper side frames to one another, each of the lower side frame and the upper side frame being A center-folded seat back (S2) is used which has stoppers (6ED, 6FD, 7B, 7C) which define the rotation range of the upper side frame with respect to the lower side frame by abutting each other.

According to this configuration, by providing the stoppers in contact with each other on the upper side frame and the lower side frame, the rotation range of the upper side frame can be easily determined.

In the above aspect, the stopper includes a lower stopper (6ED, 6FD) provided on the lower side frame and an upper stopper (7B, 7C) provided on the upper side frame, and the lower stopper And one whole of the upper stopper may be located between the left end and the right end of the other in the left-right direction.

According to this configuration, since one of the upper stopper and the lower stopper abuts on the other over the whole in the left-right direction, it is possible to secure the abutting region regardless of the relative position deviation between the upper stopper and the lower stopper. it can.

Further, in the above aspect, the upper end portion (6A) of the lower side frame and the lower end portion (7A) of the upper side frame are formed in a plate shape facing each other and facing each other, and the upper end of the lower side frame A pair of front and rear edge walls (7B, 7C) bent and raised at the front edge and the rear edge on one of the lower portion of the upper portion frame and the lower side portion of the upper side frame are formed. The stoppers may be formed at each end (6ED, 6FD) of the wall.

According to this configuration, the lower side frame and the upper side frame can be provided with the stoppers easily.

In the above aspect, the lower end portion of the upper side frame is disposed to the left and right of the upper end portion of the lower side frame, and the front edge and the rear edge of the lower end portion of the upper side frame are a pair of front and rear upper edges A wall (7B, 7C) is formed, the upper stopper is formed at the lower end of each of the two upper edge walls, and the lower stopper (6ED, 6FD) is formed on the front and rear surfaces of the lower side frame. Good to have.

According to this configuration, the rigidity of the lower end portion of the upper side frame can be improved.

Further, in the above aspect, the front edge and the rear edge of the upper end portion of the lower side frame are bent in a direction opposite to the lower end portion of the upper side frame, and the front and rear lower edge walls (6E, 6F) The lower stoppers may be formed on the wall surfaces (6ED, 6FD) of the lower edge wall.

According to this configuration, the rigidity of the upper end portion of the lower side frame can be improved.

In the aspect described above, the front edge of the lower edge wall is formed with a first step (6EC) having a first inclined surface (6ED) inclined rearward and upward, and the lower edge At the rear edge of the wall, a second step (6FC) having a second inclined surface (6FD) that inclines forward toward the upper side is formed, and the lower stopper is formed on the first inclined surface and the second inclined surface. It should be formed.

According to this configuration, the angle between the lower end portion of the upper edge wall and the surface with which the lower end portion of the upper edge wall of the lower side frame abuts can be increased, so that deformation of the lower end portion of the upper side frame is prevented. be able to.

In the above aspect, the actuator (17) includes an output portion (17A) fixed to at least one of the lower side frames and linearly moving along the lower side frames, and rotatable to the upper side frame A link (25) for pivoting the upper side frame according to the movement of the output part, the link comprising at least an upper end coupled to the lower end and a lower end coupled to the output; A portion may be disposed between the upper end of the lower side frame and the lower end of the upper side frame.

According to this configuration, a part of the link is covered by the lower side frame and the upper side frame, so the exposed area to the outside is reduced. Therefore, it is possible to suppress the biting of foreign matter into the link.

In the above aspect, it is preferable that a first recess (6J) for receiving the link is formed on the side surface of the upper end portion of the lower side frame on the lower end portion side of the upper side frame.

According to this configuration, since the link is received in the recess and does not protrude outward of the lower side frame, contact between the link and the foreign object can be prevented. In addition, the rigidity of the upper end portion of the lower side frame can be enhanced.

In the above aspect, a second concave portion (6L) recessed inward is formed at a position corresponding to the upper end portion of the link of the first concave portion, and the upper end portion of the link and the upper side frame The fastening portion may be accommodated in the second recess.

According to this configuration, the fastening portion between the upper end portion of the link and the upper side frame can be easily moved, and the link can be easily displaced. Further, the rigidity of the upper end portion of the lower side frame can be further enhanced.

In the aspect described above, the first recess and the second recess may extend to a rear edge of the lower side frame.

This configuration facilitates the assembly of the link. Also, the displacement of the link is less likely to be impeded by the first recess and the second recess, and the folding operation of the seat back becomes smooth.

As described above, according to the present invention, it is possible to provide a structure in which the pivoting range of the upper side frame can be easily determined with respect to the lower side frame in the center-folded seat back.

Further, according to the configuration in which one whole of the lower stopper and the upper stopper is positioned between the other left end and the right end in the left-right direction, one of the upper stopper and the lower stopper contacts the other across the whole in the left-right direction Therefore, the area | region which contact | abuts can be ensured irrespective of the shift | offset | difference of the relative position of an upper stopper and a lower stopper.

According to the structure in which the front and rear edge walls bent and raised toward the other at the front edge and the rear edge are formed at one of the upper end portion of the lower side frame and the lower end portion of the upper side frame. The stopper can be easily provided on the lower side frame and the upper side frame.

According to the configuration in which a pair of front and rear upper edge walls are formed at the front edge and the rear edge of the lower end portion of the upper side frame, the rigidity of the lower end portion of the upper side frame can be improved.

According to the configuration in which the front edge and the rear edge of the upper end portion of the lower side frame are bent and formed to form a pair of front and rear lower edge walls, the rigidity of the upper end portion of the lower side frame can be improved.

According to the configuration in which the first inclined surface and the second inclined surface are formed in the lower side frame, the angle between the lower end portion of the upper edge wall and the surface with which the lower end portion of the upper edge wall of the lower side frame abuts is large Therefore, deformation of the lower end portion of the upper side frame can be prevented.

According to the configuration in which the link is at least partially disposed between the upper end of the lower side frame and the lower end of the upper side frame, a portion of the link is covered by the lower side frame and the upper side frame, The exposed area to the outside is reduced. Therefore, it is possible to suppress the biting of foreign matter into the link.

According to the configuration in which the first concave portion for receiving the link is formed on the side surface on the lower end portion side of the upper side frame of the upper end portion of the lower side frame, the link is received in the concave portion and the outer side of the lower side frame The contact between the link and the foreign object can be prevented. In addition, the rigidity of the upper end portion of the lower side frame can be enhanced.

According to the structure in which the second recess is formed in the first recess and the fastening portion between the upper end of the link and the upper side frame is accommodated in the second recess, the fastening portion between the upper end of the link and the upper side frame is It becomes easy to move and the link becomes easy to displace. Further, the rigidity of the upper end portion of the lower side frame can be further enhanced.

According to the configuration in which the first recess and the second recess extend to the rear edge of the lower side frame, the assembly of the link is facilitated. Also, the displacement of the link is less likely to be impeded by the first recess and the second recess, and the folding operation of the seat back becomes smooth.

The perspective view which looked at the vehicle seat concerning an embodiment from the front. The perspective view which looked at the vehicle seat concerning an embodiment from the back Perspective view of seat back frame Side view from the inside of the main part of the seat back frame Side view of the main part of the seat back frame viewed from the outside Operation explanatory drawing which shows (A) backward inclination state of a seat back frame, and (B) forward inclination state (A) VIIA arrow line view of FIG. 6, and (B) VIIB arrow line view Illustration of assembly of upper side frame and link IX-IX sectional view of FIG. 1 Sectional view of a vehicle seat according to another embodiment

Hereinafter, with reference to the drawings, an embodiment in which a foldable seat back according to the present invention is applied to a rear seat (including a second row and a third row) of a vehicle will be described. In the following description, right and left are determined based on the occupant seated on the seat S. About a pair of structure provided in left-right symmetry, a common number may be attached | subjected and description may be abbreviate | omitted.

As shown in FIGS. 1 and 2, the seat S has a seat cushion S1 forming a seating surface, a seat back S2 forming a backrest surface, a headrest S3, and a slide rail S4. The slide rail S4 is provided to extend forward and backward on the floor of the vehicle, and supports the seat cushion S1 so as to slide forward and backward. The seatback S2 is rotatably (tilted) coupled to the seat cushion S1 via the reclining mechanism 1, and the headrest S3 is provided slidably above and below the seatback S2.

The seat back S2 includes a lower seat back S2A provided rotatably (tilted) with respect to the seat cushion S1, and an upper seat back S2 B provided rotatably (tilted) with respect to the lower seat back S2A. And a back board B. The headrest S3 is coupled to the upper seat back S2B. The backboard B includes a backboard lower portion BA disposed behind the lower seat back S2A and a backboard upper portion BB disposed behind the upper seat back S2B.

The seat cushion S1 is configured by covering a seat cushion frame with a pad and a skin. The front and sides of the seatback S2 are formed by covering the seatback frame F (FA and FB (see FIG. 3)) with the pad P and the skin SK, and the rear of the seatback S2 is backboarded on the seatback frame F It is constituted by covering B. The headrest S3 is configured by covering the headrest frame with a pad and a skin. The pad is formed of an elastic cushioning material such as polyurethane foam, the skin SK is formed of a leather, a synthetic leather, a cloth or the like, and the backboard B is formed of a synthetic resin or the like.

In the present embodiment, the lower heater HA is provided at the front of the lower seat back S2A, and the upper heater HB is provided at the front of the upper seat back S2B. The upper heater HB and the lower heater HA are respectively formed in a sheet shape and are laid between the skin SK and the pad P. The upper heater HB is provided with a harness HC for supplying power.

The pad P provided on the seat bag includes a main portion P1 corresponding to the back portion of the occupant, and a pair of left and right side portions P2 provided on the left and right of the central portion and continuous with the main portion. A vertically extending groove portion P3 is formed between the main portion P1 and the left and right side portions P2. As shown in FIG. 9, the wire member P4 is embedded in the groove P3, and the sutured portion of the skin SK is suspended from the wire member P4 using a predetermined hook P5. The harness HC is disposed between the sutured portion of the skin SK and the pad P in the groove portion P3 on the left side, and extends to the lower end of the lower seat back S2A. When the folding operation (rotation of the upper seatback S2B with respect to the lower seatback S2A) is performed, the harness HC is accommodated in the groove P3. Therefore, the harness HC follows the folding operation in the groove P3. To bend. Therefore, the turning of the upper seat back S2B is not inhibited, and the center folding operation can be smoothly performed.

Although not shown, the seat cushion frame is bridged between the left and right cushion side frames extending longitudinally, the front frame bridged between the fronts of the cushion side frames, and the rear of each cushion side frame It has a rear frame etc., and is formed in frame shape. The slide rail S4 is attached to each cushion side frame.

As shown in FIG. 3, the seat back frame F includes a pair of left and right side frames 2 extending substantially vertically, a lower frame 4 extending laterally and coupled to lower portions of both side frames 2 at both ends, and laterally extending It is formed in a frame shape with an inverted U-shaped upper frame 5 joined to the upper portions of both side frames 2 at both ends.

The side frame 2 is configured by a lower side frame 6 and an upper side frame 7 which are divided in the vertical direction. The lower side frame 6 and the upper side frame 7 are respectively formed of sheet metal members (plate-like metal members).

The upper side frame 7 is attached to an upper portion of the lower side frame 6 so as to be rotatable about a rotational axis X in the left-right direction. The lower frame 4 is coupled to the lower side frame 6 by welding, for example, and the upper frame 5 is coupled to the upper side frame 7 by welding, for example. The lower frame 4 and the lower side frame 6 constitute a seatback frame lower portion FA, and the upper side frame 7 and the upper frame 5 constitute a seatback frame upper portion FB.

As shown in FIG. 4, the main surface of each of the left and right lower side frames 6 is directed to the left and right, and extends vertically. The upper part of each lower side frame 6 bulges outward to the left and right as compared with the lower part thereof. In the upper part of the lower side frame 6 on the right side, a receiving hole 6G penetrating in the left and right direction is formed at a predetermined position. The weak portions 6H are provided in the left and right lower side frames, respectively. The fragile portion is a portion that deforms when a predetermined load or more is applied, and the deformation absorbs the load applied to the occupant at the time of a rear collision, thereby reducing the burden on the occupant. In the present embodiment, the fragile portion is formed as a substantially triangular notch at the lower rear edge of the left and right lower side frames 6. Since the fragile portion 6H is provided in the lower side frame 6, the fragile portion 6H is likely to receive a load applied to the entire seat back S2. Therefore, the burden on the occupant can be further reduced.

The upper end 6A of the lower side frame 6 is formed to have a tip end 6B which is formed to have a narrow front-rear width with respect to the other parts and which is substantially square when viewed from the left and right. The upper end 6A of the lower side frame 6 is formed with a lower edge front 6E bent inward in the left and right direction along the front edge and bent inward in the left and right direction along the rear edge. A lower edge wall rear portion 6F is formed. The lower edge wall front portion 6E includes a first lower edge wall front portion 6EA located below the tip end portion 6B, a second lower side edge wall front portion 6EB located at the front edge of the tip end portion 6B, The first stage 6EC to be connected is provided. The first lower edge wall front portion 6EA is located below and in front of the second lower edge wall front portion 6EB, and the first step portion 6EC is the upper end and the second end of the first lower edge wall front portion 6EA. The lower end of the lower edge wall front portion 6EB is connected. The first step 6EC extends rearward and upward. The first step portion 6EC is formed with a first inclined surface 6ED which is inclined rearward and upward toward the upper side and is directed obliquely upward. The lower edge wall rear portion 6F connects the first lower edge wall rear portion 6FA located below the tip end portion 6B and the second lower side edge wall rear portion 6FB located at the rear edge of the tip end portion 6B. A two-step section 6FC is provided. The first lower edge wall rear portion 6FA is located below and to the rear of the second lower edge wall rear portion 6FB, and the second step 6FC is the upper end and the second lower edge wall of the first lower edge wall rear portion 6FA. The rear 6FB is connected. The second step 6FC extends upward in the forward direction. The second step portion 6FC is formed with a second inclined surface 6FD which is inclined upward and directed obliquely upward and rearward. The first inclined surface 6ED and the second inclined surface 6FD may be formed as surfaces facing upward.

The lower edge wall front portion 6E and the lower edge wall rear portion 6F are separated. Therefore, the lower side frame 6 can be manufactured more easily than in the case where the lower side frame 6 is bent inward in the left-right direction along the front edge, the upper edge and the rear edge of the upper end portion 6A.

As shown in FIG. 5, at the upper part of the surface of the lower side frame 6 facing outward in the left-right direction, a first concave portion 6J recessed inward in the left-right direction is formed. The first recess 6J extends in the extending direction (upper and lower) and the rear of the lower side frame 6 and reaches the rear edge of the projecting end 6B of the lower side frame 6 and the rear edge of the upper end 6A of the lower side frame 6 . At the lower end of the first concave portion 6J, a through hole 6K which penetrates the lower side frame 6 in the thickness direction is formed. The through hole 6 </ b> K is formed in a long hole shape extending in the longitudinal direction (upper and lower) of the lower side frame 6.

By forming the first recess 6J, the rigidity of the upper portion of the lower side frame 6 is enhanced. The reduction in rigidity of the upper portion of the lower side frame 6 due to the formation of the through holes 6K is suppressed by the formation of the first concave portion 6J in the upper portion of the lower side frame 6.

In the first concave portion 6J, a second concave portion 6L recessed inward in the left-right direction is formed at the lower portion of the end portion 6B. The second recess 6L extends rearward and reaches the rear edge of the end 6B.

As shown in FIGS. 4 and 5, the upper side frame 7 extends in the vertical direction with its main surface facing left and right. The lower end portion 7A of the upper side frame 7 is disposed outside in the left-right direction of the upper end portion 6A of the lower side frame 6, and is opposed to the upper end portion 6A of the lower side frame 6 in the left-right direction. At the front edge and the rear edge of the upper side frame 7, an upper edge wall front portion 7B and an upper edge wall rear portion 7C bent and raised inward in the left-right direction are formed. The upper edge wall front portion 7B is disposed in front of the second lower edge wall front portion 6EB, and the upper edge wall rear portion 7C is disposed behind the second lower edge wall rear portion 6FB. That is, the second lower edge front 6EB and the second lower edge rear 6FB are disposed between the upper edge front 7B and the upper edge rear 7C in the front-rear direction. The lower end of the upper edge wall front portion 7B faces the first inclined surface 6ED of the first step portion 6EC with a gap, and the lower end of the upper edge wall rear portion 7C has a gap with the second inclined surface 6FD of the second step portion 6FC. We are facing each other.

As shown in FIG. 7A, the width (left-right width) in the left-right direction of the lower end of the upper edge wall front portion 7B is larger than the left-right width of the first inclined surface 6ED. The left end of the first inclined surface 6ED is located to the right of the lower end left end of the upper edge wall front portion 7B, and the right end of the first inclined surface 6ED is located to the left of the lower end right end of the upper edge wall front portion 7B. That is, in the left-right direction, the entire first inclined surface 6ED is located between the left end and the right end of the upper edge wall front portion 7B. As shown in FIG. 7B, the left and right width of the lower end of the upper edge wall rear portion 7C is larger than the left and right width of the second inclined surface 6FD. In the left-right direction, the entire second inclined surface 6FD is located between the left end and the right end of the upper edge wall rear portion 7C.

The lower end portion 7A of the upper side frame 7 is rotatably coupled to the upper end portion 6A of the lower side frame 6 by a shaft member 22 extending leftward and rightward. The center of the shaft member 22 is the pivot axis X of the upper side frame 7 and the lower side frame 6. The shaft member 22 is disposed between the second lower edge front 6EB and the second lower edge rear 6FB. Thus, the first step 6EC, the first lower edge front 6EA, the second step 6FC, and the second lower edge rear 6FB are located below the shaft member 22. When the lower side frame 6 and the upper side frame 7 are joined, the lower edge wall front portion 6E and the lower edge wall rear portion 6F project from the lower side frame 6 to the side opposite to the upper side frame 7 side, and the upper edge The wall front portion 7B and the upper edge wall rear portion 7C protrude from the upper side frame 7 to the lower side frame 6 side. The upper edge wall front portion 7B extends downward from above the front of the shaft member 22, and the upper edge wall rear portion 7C extends downward from above the rear of the shaft member 22. The lower end portion 7A of the upper side frame 7 is disposed at a position overlapping the second recess 6L.

The left and right lower edge wall rear portions 6F each have a projecting portion 6M which is a portion that protrudes inward largely in the rear of the first recess 6J compared to the other portions. A first board mounting portion 9 made of an inverted U-shaped steel rod is fixed to a projecting end of the projecting portion 6M so as to further project upward. The first board attachment portion 9 is used to attach the backboard lower portion BA to the seat back frame lower portion FA. That is, the protrusion 6M is a backboard support portion for supporting the backboard lower portion BA. In addition, since the protrusion 6M is provided in the vicinity of the first recess 6J which is a high rigidity portion of the lower side frame 6, the load of the backboard lower portion BA can be supported, and the lower when the load is applied. The side frame 6 is difficult to deform.

The upper side frame 7 protrudes inward in the vicinity of the upper end in a larger inward direction than the other parts, and the protruding portion constitutes a second board attachment portion 11 for attaching the backboard upper portion BB to the seat back frame upper portion FB doing. A pair of headrest holding portions 12 for supporting the headrest S3 is joined to upper portions of the upper frame 5 extending to the left and right. A plate-like reinforcing frame 13 is stretched around the left and right pillar portions of the upper frame 5 extending substantially in the vertical direction so as to extend in the left-right direction. The reinforcing frame 13 is formed with a through hole 13A for fixing the backboard upper portion BB, and the reinforcing frame 13 also functions as a third board mounting portion for fixing the backboard upper portion BB. The reinforcing frame 13 is formed with a flange portion 13B extending forward along the lower edge thereof.

At lower portions of the left and right lower side frames 6, an upper connecting wire 31 and a lower connecting wire 32 connecting the lower side frames 6 are provided. Both the upper connection wire 31 and the lower connection wire 32 are formed of metal rod members bent in a continuous substantially S-shape. The upper connecting wire 31 is located above the lower connecting wire 32, and both ends of the upper connecting wire 31 are connected to a substantially central portion in the front and rear direction at the lower portion of the lower side frame 6. Is coupled to the rear end of the lower side frame 6 at its lower end. The upper connecting wire 31 and the lower connecting wire 32 elastically support the waist of the occupant by bending the bent portion.

Between the upper connection wire 31 and the reinforcing frame 13, a grid-like member 33 is provided which is stretched around them. The grid-like member 33 is disposed between the left frame member 34A and the right frame member 34B and the left frame member 34A and the right frame member 34B. A plurality of linear members 35 bridged to the left and right, and an upper and lower connecting member 36 that collectively connects the linear members 35 between the left frame member 34A and the right frame member 34B. The left frame member 34A, the right frame member 34B, and the upper and lower connecting members 36 are made of metal rod members. The linear members 35 are arranged in parallel at substantially equal intervals in the vertical direction, and wound around and fixed to the left frame member 34A and the right frame member 34B at both ends.

In the flange portion 13B, through

holes

13C and 13D penetrating vertically are formed at positions corresponding to the left frame member 34A and the right frame member 34B. The upper ends of the left frame member 34A and the right frame member 34B respectively extend upward through the through

holes

13C and 13D. In the wall surface of the reinforcing frame 13 facing in the front-rear direction,

elongated holes

13E and 13F extending in the vertical direction are formed at positions corresponding to the upper portions of the left frame member 34A and the right frame member 34B. The upper end of the left frame member 34A and the upper end of the right frame member 34B are bent downward to form a J shape, and are latched to the

long holes

13E and 13F. The upper ends of the left frame member 34A and the right frame member 34B can move relative to the

elongated holes

13E and 13F. Since the portions to which the upper ends of the left frame member 34A and the right frame member 34B are latched are formed in a long hole shape, the upper end of the left frame member 34A and the right frame member 34B are bent when the seatback S2 is folded. The upper ends are easy to move in the vertical direction, respectively, and the folding operation can be smoothly performed. The lower end of the left frame member 34A and the lower end of the right frame member 34B are respectively coupled to the upper connection wire 31 using the binding tool 37. When a load from the front is applied, the grid-like member 33 is bent and the occupant's back is elastically supported.

An actuator 17 for tilting and driving the right upper side frame 7 is attached to the lower surface of the lower side frame 6 on the right side. The actuator 17 includes an electric motor 18, a reduction mechanism connected to the output shaft of the electric motor 18, and a conversion mechanism such as a feed screw or a ball screw for converting the rotational movement of the reduction mechanism into a linear movement. It is driven to extend and retract 17A in a straight line, and various known mechanisms can be applied. The actuator 17 is fixed by a bolt or the like at a position overlapping the receiving hole 6G of the lower side frame 6 from the inside in a direction in which the output portion 17A extends along the lower side frame 6.

An air bag 19 that is deployed to the side of a passenger at the time of a vehicle collision is attached to the lower part of the inner side of the lower side frame 6 on the left side. Since the air bag 19 is attached to the lower side frame 6, the air bag 19 is stably supported. Also, the airbag 19 can be deployed in a desired manner regardless of the position of the upper seat back S2B. Since the air bag 19 is disposed on the inner side of the lower side frame 6, the air bag 19 can be attached using an effective space, and compared with the case where the air bag 19 is disposed on the outer side of the lower side frame 6, The lateral width of the back S2 can be reduced.

4 shows the inner surface of the side frame 2 on the right side, and FIG. 5 shows the outer surface of the side frame 2 on the right side. The upper side frame 7 is generally in parallel with the lower side frame 6, respectively. The state in which the side frame 7 is at the most backward inclined position (hereinafter referred to as the backward inclined position) is shown. While the lower side frame 6 and the upper side frame 7 are both inclined backward with respect to the vertical line in the normal use state of the seat S, here, assuming that the extension direction of these members is up and down, and the upper side The positional relationship (upper and lower relationship and front and rear relationship) of the members and the like will be described on the assumption that the side frame 7 is in the backward tilt position.

As shown in FIG. 5, the link 25 is received in the first recess 6J. The link 25 is a sheet metal member and extends in the longitudinal direction of the first recess 6J. The link 25 is disposed between the lower side frame 6 and the upper side frame 7 in parallel with both members. The lower end of the link 25 is disposed at a position facing the through hole 6K. At the lower end of the link 25, a first pin 24 which passes through the through hole 6 K and protrudes inward in the left-right direction of the lower side frame 6 is rotatably coupled. The first pin 24 is slidably engaged with the through hole 6K in the vertical direction. An output portion 17A of the actuator 17 is connected to an end portion of the first pin 24 inward in the left-right direction.

The upper end of the link 25 is disposed between the second recess 6 </ b> L of the lower side frame 6 and the upper side frame 7. A through hole 7D is formed in the surface on the inner side in the left-right direction of the upper side frame 7, and the upper end of the link 25 and the upper side frame 7 are rotatably coupled by a second pin 27 extending leftward and rightward. The second pin 27 is located between the second recess 6 L of the lower side frame 6 and the upper side frame 7. The second pin 27 is disposed rearward of the shaft member 22 and rearward of a straight line connecting the shaft member 22 and the first pin 24.

As shown in FIG. 8, in the present embodiment, a hexagonal through hole 25 </ b> A is formed at the upper end of the link 25. The second pin 27 is formed by a half screw bolt and includes a head portion 27A, a root corner 27B, and a screw portion 27C in the order described. The root corner 27B is formed in a hexagonal column shape that fits into the through hole 25A. A cylindrical portion 27CA in which no male screw is formed is provided at the head side end of the screw portion 27C. The upper end of the link 25 and the upper side frame 7 are coupled by passing the second pin 27 from the lower side frame 6 side of the link 25 and coupling the nut 28 to the screw portion 27C from the left and right outside of the upper side frame 7 There is. At the time of coupling, since the cylindrical portion 27CA passes through the through hole 7D of the upper side frame 7, the link 25 and the upper side frame 7 can be rotated relative to each other. At the time of fastening, the rotation is restricted by fitting the root corner 27B into the through hole 25A of the link 25, so that the nut 28 can be easily coupled to the screw 27C. The root corner 27B may be formed in a square pole shape, and the through hole 25A of the link 25 may be formed in a square shape.

Next, the operation of the upper side frame 7 will be described. 6 (A) shows a state in which the upper side frame 7 is in the rearward inclined position as in FIG. 4, and FIG. 6 (B) shows a position where the upper side frame 7 is most inclined forward (hereinafter referred to as the forward inclined position). Indicates the state of

By the extension drive of the actuator 17, the first pin 24 connected to the output portion 17A goes straight upward parallel to the lower side frame 6 along the through hole 6K. Along with this, the link 25 tilts rearward about the first pin 24 and pushes the second pin 27 upward. As a result, the upper side frame 7 tilts forward about the rotation axis X, and the upper side frame 7 assumes a forward inclined position in which the lower end of the upper edge wall front portion 7B abuts on the first inclined surface 6ED. . In the forward inclined position, the lower end of the upper edge wall front portion 7B is in contact with the first inclined surface 6ED, so that rotation (forward inclination) of the upper side frame 7 with respect to the lower side frame 6 is restricted. Therefore, the lower end of the upper edge wall front portion 7B and the first inclined surface 6ED each function as a stopper that determines the rotation range of the upper side frame 7 with respect to the lower side frame 6. The lower end of the upper edge wall front portion 7B functions as an upper stopper, and the first inclined surface 6ED functions as a lower stopper.

When the actuator 17 is driven to be shortened, the first pin 24 connected to the output portion 17A goes straight downward in parallel with the lower side frame 6 along the through hole 6K. Along with this, the link 25 tilts forward about the first pin 24 and pulls the second pin 27 downward. As a result, the upper side frame 7 tilts rearward about the rotation axis X, and the lower end of the upper edge wall rear portion 7C is in a rearward inclined position after coming into contact with the second inclined surface 6FD. In the rearward inclined position, the lower end of the upper edge wall rear portion 7C is in contact with the second inclined surface 6FD, so that the turning (backward inclination) of the upper side frame 7 with respect to the lower side frame 6 is restricted. Therefore, the lower end of the upper edge wall rear portion 7C and the second inclined surface 6FD function as a stopper that determines the rotation range of the upper side frame 7 with respect to the lower side frame 6. The lower end of the upper edge wall rear portion 7C functions as an upper stopper, and the second inclined surface 6FD functions as a lower stopper.

Next, the effects of the seat back S2 configured as described above will be described with reference to FIGS. 4 to 7. A link mechanism 16 is formed to tilt the seatback frame upper portion FB by driving the actuator 17 and linearly moving the output portion 17A. Further, the lower end of the upper edge wall front portion 7B, the lower end of the upper edge wall rear portion 7C, the first inclined surface 6ED and the second inclined surface 6FD function as stoppers, and the rotation range of the upper side frame 7 can be defined. Since the lower side frame 6 and the upper side frame 7 are in contact with each other at the forward and backward inclined positions, the load is applied to the shaft member 22 even when a load is applied to the upper seat back S2B by a rear collision or the like. The deformation of the seat back frame F can be prevented without concentration.

As shown in FIGS. 6 (A) and 7 (A), when in the backward position, the second inclined surface 6FD is in contact with the lower end of the upper edge wall rear portion 7C. At this time, the second inclined surface 6FD is located between the right end and the left end of the lower end of the upper edge wall rear portion 7C in the left-right direction. Therefore, the contact area does not change even when the relative position of the lower side frame 6 and the upper side frame 7 deviates due to a large load or the like. In addition, the load applied to the second inclined surface 6FD from the lower end of the upper edge wall rear portion 7C is unlikely to be uneven in the left-right direction, and the deformation of the second inclined surface 6FD and the upper edge wall rear portion 7C is prevented. Further, it is difficult to apply a load for moving the lower side frame 6 in the left-right direction, and deformation of the lower side frame 6 is prevented.

As shown in FIG. 6 (B) and FIG. 7 (B), when in the forward inclined position, the first inclined surface 6ED is in contact with the lower end of the upper edge wall front portion 7B. At this time, the first inclined surface 6ED is located between the right end and the left end of the lower end of the upper edge wall front portion 7B in the left-right direction. Therefore, the contact area does not change even when the relative position of the lower side frame 6 and the upper side frame 7 deviates due to a large load or the like. Further, the load applied to the first inclined surface 6ED from the lower end of the upper edge wall front portion 7B is unlikely to be uneven in the left-right direction, and the deformation of the first inclined surface 6ED and the upper edge wall front 7B is prevented. Further, it is difficult to apply a load for moving the lower side frame 6 in the left-right direction, and deformation of the lower side frame 6 is prevented.

The lower side frame 6 and the upper side frame 7 are bent to form stoppers (upper edge wall front portion 7B, upper edge wall rear portion 7C, first inclined surface 6ED, and second inclined surface 6FD) for defining a rotation range. It is not necessary to prepare a separate member to define the pivot range. Therefore, the stopper can be easily formed, and the structure is simple.

Since the lower edge front 6E and the lower edge rear 6F are provided at the upper end 6A of the lower side frame 6, the rigidity of the lower side frame 6 is improved. Further, since the upper edge wall front portion 7B and the upper edge wall rear portion 7C are provided at the lower end portion 7A of the upper side frame 7, the rigidity of the upper side frame 7 is improved.

The upper end portion of the link 25 is covered by the upper end portion 6A of the lower side frame 6 and the lower end portion 7A of the upper side frame 7, and the exposed area to the outside is reduced. As a result, biting of foreign matter into the link 25 is suppressed. The link 25 is received by the first recess 6 J and does not protrude outward of the lower side frame 6, so foreign objects are less likely to contact the link 25. By providing the first recess 6J, the rigidity of the upper end 6A of the lower side frame 6 is improved.

The upper edge wall front portion 7B and the upper edge wall rear portion 7C abut on the first inclined surface 6ED and the second inclined surface 6FD, respectively, so that the rotation is restricted. Since the first inclined surface 6ED extends rearward toward the upper side, the lower end of the upper edge wall front portion 7B is made vertically perpendicular to the first inclined surface 6ED as compared with the case where it is parallel to the extending direction of the lower side frame 6 Abuts at a close angle. Therefore, the load in the direction away from the upper edge wall rear portion 7C is less likely to be applied to the upper edge wall front portion 7B. Since the second inclined surface 6FD extends rearward toward the upper side, the lower end of the upper edge wall rear portion 7C is closer to vertical than the second inclined surface 6FD as compared to the case parallel to the extending direction of the lower side frame 6. Abuts at an angle. Therefore, a load in a direction away from the upper edge wall front portion 7B is less likely to be applied to the upper edge wall rear portion 7C. Therefore, the deformation of the lower end portion 7A of the upper side frame 7 can be prevented.

Since the head 27A of the second pin 27 is accommodated in the second recess 6L, the second pin 27 is easy to move. Therefore, the fastening portion between the upper end portion of the link 25 and the upper side frame 7 can be easily moved, and the link 25 can be easily displaced. Further, the rigidity of the upper end of the lower side frame 6 is improved by forming the second recess 6L.

The first recess 6J and the second recess 6L extend to the rear edge of the lower side frame 6. Therefore, when the upper side frame 7 is displaced from the backward inclination position to the forward inclination position, the backward inclination of the link 25 with respect to the first pin 24 is less likely to be impeded, and the centering operation of the seatback S2 becomes smooth. In addition, since the link 25 can be inserted from the rear edge of the lower side frame 6, assembly of the link 25 is facilitated.

Further, a through hole 6 K which extends along the extending direction of the lower side frame 6 and guides the output portion 17 A of the actuator 17 is formed in the lower side frame 6. Therefore, rattling of the output portion 17A of the actuator 17 is prevented, and the mid-folding operation of the seat back S2 becomes smooth.

The output portion 17A of the actuator 17 and the link 25 are connected to each other through the first pin 24 extending in the left-right direction and engaged with the through hole 6K, and the through hole 6K is output through the first pin 24 It guides the section 17A. Therefore, there is no need to provide a dedicated guided portion or a guided member, and the configuration is simplified.

As shown in FIG. 3, the upper portion of the lower side frame 6 bulges outward to the left and right. Therefore, a space for accommodating the actuator 17 between the upper portions of the lower side frame 6 can be secured, and the actuator 17 can be easily assembled. Since the actuator 17 is disposed at a position overlapping the receiving hole 6G, the width in the left-right direction of the entire actuator 17 and the lower side frame 6 can be reduced as compared with the case where the receiving hole 6G is not provided.

Although the description of the specific embodiment is ended above, the present invention can be widely modified without being limited to the above embodiment. For example, a seat for a vehicle such as a railway vehicle, an aircraft, or a ship, furniture or office The present invention can also be applied to chairs and the like. In addition, specific configurations and arrangements of each member and part, quantity, angle, and the like can be appropriately changed without departing from the scope of the present invention. On the other hand, not all of the components shown in the above embodiment are necessarily essential, and can be selected as appropriate.

In the above embodiment, the upper end 6A of the lower side frame 6 is located inside the lower end 7A of the upper side frame 7 in the left-right direction. However, the upper end 6A of the lower side frame 6 is lower end 7A of the upper side frame 7. It may be located in the left-right direction outside of. By arranging the upper end 6A of the lower side frame 6 outside the lower end 7A of the upper side frame 7 in the lateral direction, the lateral width of the lower side frame 6 can be increased, and the rigidity of the seatback frame F is improved. be able to.

The configurations of the lower edge wall 6C, the upper edge front 7B, and the upper edge rear 7C can be changed as appropriate. For example, the upper edge wall front portion 7B and the upper edge wall rear portion 7C may protrude outward in the left-right direction (opposite to the lower side frame 6).

In the above embodiment, as shown in FIG. 10, the upper seat back S2B and the lower seat back S2A are formed using an integral pad P, but are formed using two upper pads PB and lower pads PA. It may be The upper seat back S2B is formed using the upper pad PB, and the lower seat back S2A is formed using the lower pad PA. An upper heater HB is provided on the upper seat back S2B. The harness HC of the upper heater HB may extend between the upper pad PB and the lower pad PA, extend rearward, and extend rearward of the lower pad PA and extend downward. Further, it is preferable that the upper pad PB be formed with a recess 50 for releasing the extra length generated in the harness HC due to the backward inclination of the upper seat back S2B.

When a fan is provided inside the seat back S2, it may be coupled to the upper side frame 7 or the upper frame 5. In that case, the comfort of the seat S is improved because the posture of the occupant can be made to follow. Also, the fan may be coupled to the lower side frame 6 or the lower frame 4. In that case, the harness provided to the fan can be easily wired.

In the above embodiment, the lower end of the upper edge wall front portion 7B is configured to abut directly on the first inclined surface 6ED, but at least one of the lower end of the upper edge wall front portion 7B and the first inclined surface 6ED You may stick rubber, a nonwoven fabric, etc. By sticking a rubber, a non-woven fabric or the like, it is possible to prevent the generation of abnormal noise at the time of contact and the deformation of the side frame 2. Similarly, the generation of abnormal noise or the deformation of the side frame 2 may be prevented by affixing a rubber, non-woven fabric or the like to at least one of the lower end of the upper edge wall rear portion 7C and the second inclined surface 6FD.

5: upper frame 6: lower side frame 6A: upper end 6EC: first step 6ED: first inclined surface 6FC: second step 6FD: second inclined surface 6J: first recess 6L: second recess 7: upper Side frame 7A: lower end portion 7B: upper edge wall front portion 7C: upper edge wall rear portion 17: actuator 17A: output portion 25: link S2: seat back (centered seat back)
X: Rotation axis

Claims

A pair of left and right lower side frames extending in the vertical direction;
A pair of left and right upper side frames rotatably mounted on respective upper end portions of the lower side frames so as to be rotatable about pivot axes extending in the left and right directions;
And an upper frame connecting the upper side frames to each other,
Each of the lower side frame and the upper side frame includes a stopper that determines a rotation range of the upper side frame with respect to the lower side frame by contacting each other.
The stopper includes a lower stopper provided on the lower side frame, and an upper stopper provided on the upper side frame.
The half-folded seat back according to claim 1, wherein the entire one of the lower stopper and the upper stopper is positioned between the other left end and the right end in the left-right direction.
The upper end portion of the lower side frame and the lower end portion of the upper side frame are formed in a plate shape facing each other and facing each other,
At one of the upper end portion of the lower side frame and the lower end portion of the upper side frame, there are formed a pair of front and rear edge walls bent and raised at the front edge and the rear edge toward the other,
The foldable seat back according to claim 2, wherein the stoppers are respectively formed on the other front and rear surfaces and the respective end portions of the edge wall.
The lower end portion of the upper side frame is disposed to the left and right of the upper end portion of the lower side frame,
A pair of front and rear upper edge walls are formed at the front edge and the rear edge of the lower end portion of the upper side frame,
The half-folded sheet according to claim 3, wherein the upper stoppers are formed on lower ends of the two upper edge walls, and the lower stoppers are formed on the front and rear surfaces of the lower side frame, respectively. back.
The front edge and the rear edge of the upper end portion of the lower side frame are bent in a direction opposite to the lower end portion of the upper side frame to form a pair of front and rear lower side edge walls,
5. The center-folded seat back according to claim 4, wherein the lower stopper is formed on a wall surface of the lower edge wall.
The front edge of the lower edge wall is formed with a first step portion having a first inclined surface which is inclined rearwardly upward.
The rear edge of the lower edge wall is formed with a second step having a second inclined surface which is inclined forward toward the upper side,
6. The center-folded seat back according to claim 5, wherein the lower stopper is formed on the first inclined surface and the second inclined surface.
An actuator fixed to at least one of the lower side frames and having an output portion which moves linearly along the lower side frames;
The upper side frame includes an upper end rotatably coupled to the upper side frame, and a lower end coupled to the output unit, and a link rotating the upper side frame according to the movement of the output unit.
The link according to any one of claims 1 to 6, wherein at least a part of the link is disposed between an upper end of the lower side frame and a lower end of the upper side frame. Mid-fold seat back.
8. The center-folded seat back according to claim 7, wherein a first concave portion for receiving the link is formed on a side surface of the upper end portion of the lower side frame on the lower end portion side of the upper side frame.
A second recess that is recessed inward is formed at a position corresponding to the upper end of the link of the first recess,
The center-folded seat back according to claim 8, wherein a fastening portion between an upper end portion of the link and the upper side frame is accommodated in the second recess.
The foldable seat back according to claim 9, wherein the first recess and the second recess extend to a rear edge of the lower side frame.