JP2011078557A - Seat back for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrict breakage of a plate member of resin to receive the backrest load of a seated person when an excessive load is added to the plate member, so that less effect is given to the comfortableness of a seated person in a normal sitting position. <P>SOLUTION: The device includes a framework part 41, a pad part 23, and a panel part 31 as the plate member of resin arranged along the pad part 23 between the pad part 23 and the framework part 41 to elastically receive the load of the seated person. The framework part 41 includes a circumferential edge part 55 to correspond to at least part of the circumferential edges of the panel part 31, and a center support part 57 to correspond to at least part of the center of the panel part. The framework part is relatively positioned in such a way that the center support part is apart from the panel part 31 through a gap S, and that the circumferential edge part 55 is in contact with it as there is no person seated. The gap S is set in such a way that the panel part 31 abuts on the center support part 57 as the panel part 31 is elastically deformed by the load added to the panel part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle seat back.

  Patent Document 1 discloses a vehicle seat back in which a hard resin plate is attached to the front side of a gate-shaped frame member, and a cushion material is bonded to the front surface of the resin plate. In the following Patent Document 1, by adopting a configuration in which the cushion material is bonded to the resin plate, the central portion and the peripheral portion of the cushion material can be divided and arranged separately from each other, thereby cushioning the entire surface. Compared to the case where a material is provided, the area of the cushion material can be reduced to reduce the weight. In addition, in this seat back, the left and right ends of the resin plate are formed to project forward to support both sides of the seated person, so that the cushioning material can be secured to the seated person without having to be thick at the periphery. It is thought that it contributes to weight reduction also in an easy point.

JP 2007-275619 A

  However, in the above-mentioned Patent Document 1, the skeleton is composed of a gate-shaped frame member, and the rear side is opened at the center of the resin plate that receives the backrest load of the seated person. There is concern that the plate will break and fall back. In order to suppress breakage of the resin plate, it is conceivable to increase the toughness of the resin plate itself. However, changing the physical characteristics of the resin plate also affects the sitting comfort in a normal sitting state.

  Accordingly, an object of the present invention is to prevent damage to a plate-like member when an excessive load is applied in a normal seating state when receiving a seated person's backrest load with a resin-made plate-like member in a vehicle seat back. This is to enable a configuration that hardly affects the seating comfort.

  The vehicle seat back according to the present invention includes a skeleton part that supports a backrest load when a seated person is seated, a pad part that is disposed on the seater position side of the skeleton part and forms a backrest surface, and the pad. A panel portion made of a resin plate member disposed along the rear surface of the pad portion and elastically receiving a load of a seated person via the pad portion. The skeleton part includes a peripheral part corresponding to at least a part of the peripheral part of the panel part and a central support part corresponding to at least a part of the center of the panel part. The “periphery” and “center” of the panel portion indicate a relative positional relationship in the surface direction of the panel portion. The “center” is a portion that mainly receives the backrest load of the seated person on the relatively inner side in the plane direction, and the “periphery” is a portion on the outer side in the plane direction with respect to the “center”. The skeleton portion and the panel portion are in a state in which the central support portion of the skeleton portion and the panel portion are separated with a gap when not seated, and the peripheral portion of the skeleton portion and the panel portion are in contact with each other Are positioned relative to each other. The gap is a gap within a range in which the panel portion is elastically deformed by a load acting on the panel portion and abuts against a central support portion of the skeleton portion.

  According to such a vehicle seat back, an elastic deformation that allows the panel portion to bend rearward while receiving the backrest load of the seated person while entering the gap is allowed. However, when the panel portion receives a load of a certain level or more and comes into contact with the central support portion of the skeleton portion, the rearward displacement is prevented by the central support portion, and further bending is suppressed. In other words, since the gap is set between the panel part and the central support part, the panel part is allowed to bend to the rear to some extent, but the deformation of the panel part comes into contact with the central support part and the deformation is broken. It is regulated before it reaches. For this reason, the load of the seated person can be elastically received until the panel part comes into contact with the central support part, and the central support part does not affect the seating comfort, but when the load exceeds a certain level, Damage to the panel portion can be suppressed by the support site.

  In the vehicle seat back of the present invention, the size of the gap does not contact the central support portion of the skeleton even when the panel portion receives a normal backrest load, but exceeds the normal backrest load. It is preferable that the size is abutted when receiving an excessive load. In this case, since the panel portion does not come into contact with the central support portion of the skeleton portion in the normal sitting state, it is easy to ensure a good sitting comfort without causing the seated person to feel the bottom.

  According to the vehicle seat back of the present invention, it is possible to suppress the panel portion from being damaged when a large load is applied to the rear while suppressing the influence on the sitting comfort in the normal sitting state.

1 is a perspective view of a vehicle seat according to an embodiment of the present invention. It is the perspective view which looked at the vehicle seat shown by FIG. 1 from another angle. It is a rear view of the vehicle seat shown in FIG. It is a perspective view of the frame part of the vehicular seat concerning the embodiment of the present invention. FIG. 2 is an exploded perspective view of the vehicle seat shown in FIG. 1. FIG. 4 is a sectional view taken along the line VI-VI of the vehicle seat back shown in FIG. 3. It is the VII-VII sectional view taken on the line of the vehicle seat back shown in FIG. FIG. 5 is a cross-sectional view of the vehicle seat back shown in FIG. 3 taken along line VIII-VIII. It is the perspective view which looked at the seat back pad concerning this embodiment from the slanting back. It is a perspective view which expands and shows the attachment structure which attaches the seat back pad which concerns on this embodiment to a seat back panel.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the seat back 21 of this embodiment includes a seat cushion 71 on which a seated person sits down and a headrest 91 on which a head is leaned, and a vehicle seat 11 mounted on a vehicle such as an automobile. Is configured. FR, RR, UP, and W indicated by arrows in each figure are the front, rear, and upper sides of the vehicle seat 11 that are defined with reference to the direction viewed from the seated person seated in the normal seating position on the vehicle seat 11. , Shows the width direction.

  As shown in FIG. 5, the seat back 21 includes a seat back pad 23, a seat back panel 31, and a skeleton assembly 41 in order from the front where the seated person is located. The seat back 21 is configured such that the seat back load is received by the seat back panel 31 via the seat back pad 23 and supported by the skeleton assembly 41 via the seat back panel 31. . The seat back pad 23, the seat back panel 31, and the skeleton assembly 41 of the present embodiment correspond to the pad portion, the panel portion, and the skeleton portion of the present invention. First, the configuration of each part will be described.

  The seat back pad 23 is formed by covering a pad body made of a molded body such as urethane foam with a skin material such as fabric or leather, and the front surface 23a forms a backrest surface 21a.

  The seat back panel 31 is a plate-like member that can elastically receive a load of a seated person and is made of a resin such as polypropylene. The seat back panel 31 is a plate-like member having a size capable of receiving the entire back of the seated person, and the front surface 31a has a three-dimensional surface shape corresponding to the shape of the back of the seated person. Specifically, when viewed in a longitudinal section, as shown in FIG. 6, it is curved along the S-curve of the seated person's spine. Further, as shown in FIGS. 7 and 8, when viewed in a cross section, the center has a curved shape that is recessed rearward and both ends project forward to hold the back so as to be wrapped. As shown in FIG. 5, the seatback panel 31 has a plurality of through holes 33 and has a mesh structure. In the seat back panel 31, the ease of structural bending is adjusted at various locations in the plane direction by controlling the size of the through holes 33 at various locations in the plane direction. Specifically, the through hole 33 is formed to be relatively large at the portion supporting the central back and is relatively easy to bend, and the through hole 33 is formed to be relatively small at the portion supporting the shoulder and side of the periphery. This makes it difficult to bend flexibly and enhances the holding ability for a seated person.

  The skeleton assembly 41 includes a plate-like skeleton member 43 and a basic skeleton member 45, and has a substantially X shape as a whole as shown in FIG.

The basic skeleton member 45 includes a lower part 47 disposed in the lower part and an upper part 49 disposed in the upper part.
The lower part 47 includes a pair of upright portions 47a and 47a erected on both sides of the seat back 21, and a horizontal portion 47b disposed across the center of the seat back 21, and the upright portion 47a. 47a are connected to each other by a horizontal portion 47b to form a gate shape as a whole. In the present embodiment, as shown in FIG. 4, the lower part 47 is composed of two metal pipes 48a and 48b that are bent into two gates, and the pipes 48a and 48b overlap vertically in the horizontal portion 47b. In this state, the upright portions 47a and 47a are shifted back and forth. Brackets 48c and 48c are joined across the pipes 48a and 48b at the lower ends of the standing portions 47a and 47a. The brackets 48c and 48c constitute a connecting portion 41a connected to a cushion frame 81 which is a skeleton of the seat cushion 71, and are connected to the cushion frame 81 via a reclining mechanism (not shown).
The upper part 49 is formed by pressing a metal plate, and the plate surface is arranged facing forward. As shown in FIG. 3, the upper part 49 has a U-like shape that expands upward, and is joined to the horizontal part 47 b of the lower part 47 at the center in the width direction of the seat back 21 and from above the horizontal part 47 b. And a pair of widened portions 49b and 49b extending upward from both ends of the central portion 49a in a reverse C shape.
With this configuration, the basic skeleton member 45 has a substantially X shape that intersects at the center of the seat back 21.

  The plate-like skeleton member 43 has an X-shape that overlaps with the basic skeleton member 45, and also corresponds to the side portions 43a and 43a corresponding to the standing portions 47a and 47a of the basic skeleton member 45 and the expanded portions 49b and 49b. The upper portions 43b and 43b project outward from the position of the basic skeleton member 45 so as to overlap the edge of the seat back panel 31. The plate-like skeleton member 43 is joined to the front side of the basic skeleton member 45 to constitute the skeleton assembly 41. The rear side of the skeleton assembly 41 is covered with a back shield 61, and the basic skeleton member 45 is disposed between the plate-like skeleton member 43 and the back shield 61.

Next, the relative positional relationship of each part in the seat back 21 will be described.
As shown in FIGS. 6 to 8, the seat back pad 23 and the seat back panel 31 are arranged in contact with each other. The seat back pad 23 has a rear surface 23b whose surface shape matches the surface shape of the front surface 31a of the seat back panel 31, and is detachably attached to the seat back panel 31 to the front surface 31a of the seat back panel 31. It is held in contact.

  As shown in FIG. 10, the mounting structure of the seat back pad 23 to the seat back panel 31 is formed so as to penetrate the locking projection 29 and the seat back panel 31 provided integrally with the seat back pad 23 in the thickness direction. It is comprised with the latching hole 35 made. As shown in FIG. 9, a plurality of locking projections 29 of the seat back pad 23 are provided on both sides of the rear surface 23b of the seat back pad 23, and protrude rearward. The locking projection 29 has a shaft portion 29a and a head portion 29b that is provided at the tip of the shaft portion 29a and has a larger diameter than the shaft portion 29a. The locking hole 35 of the seat back panel 31 is formed at a position corresponding to the locking projection 29 of the seat back pad 23. As shown in FIG. 10, the locking hole 35 includes a locking release portion 35 a having a size capable of allowing passage of the head 29 b of the locking protrusion 29, and a shaft that does not allow passage of the head 29 b. An engagement portion 35b having a size that allows passage of the portion 29a is continuously formed in the surface direction, and the engagement portion 35b is positioned outward in the width direction with respect to the engagement release portion 35a. . In this mounting structure, the locking projection 29 is inserted into the locking release portion 35a and slid to the locking portion 35b, whereby the head portion 29b of the locking projection 29 is caught on the periphery of the locking hole 35 and is prevented from coming off. That is, when the seat back pad 23 is attached to the seat back panel 31, the seat back pad 23 is compressed or bent to be positioned inward in the width direction, and as shown by a two-dot chain line in FIG. The latching protrusion 29 is inserted into the seat and the acting force that compresses or bends the seatback pad 23 is released, so that the latching protrusion 29 slides outward in the width direction by the elasticity of the seatback pad 23 and is shown by a solid line. Entry into the locking portion 35b. As a result, the seat back pad 23 can be locked to the seat back panel 31. Further, the seat back pad 23 can be removed from the seat back panel 31 by the reverse operation. According to this mounting structure, when the seated person is seated, the locking projection 29 is engaged by the acting force that the locking projection 29 tends to be displaced outward in the width direction relative to the seat back panel 31. Returning to the stop release part 35a is suppressed. That is, when a seated backrest load is applied to the seat back panel 31 via the seat back pad 23, the center of the seat back panel 31 bends backward with the seat back pad 23 as described later, and the curved shape thereof At the both sides of the seat back pad 23 located on the inner side of the seat back panel 31, the seat back pad 31 tends to be displaced outward. Thereby, it is suppressed that the latching protrusion 29 returns to the latch release part 35a of the width direction inner side. With this mounting structure, the seat back pad 23 can be easily attached to and detached from the seat back panel 31, but the seat back pad 23 is securely attached to the seat back panel 31 in the seated state. The

A part of the seat back panel 31 and the skeleton assembly 41 are arranged so as to be in constant contact with each other, and the other parts are arranged in a separated state in the non-sitting state. Specifically, the skeleton assembly 41 is connected to a part of the periphery of the seat back panel 31 in a contact state. In the present embodiment, four connection points between the seat back panel 31 and the skeleton assembly 41 are set. As shown in FIG. 3, the upper connection portions 51, 51 of the upper parts 43 b, 43 b of the plate-like skeleton member 43 The lower side portions 43 a and 43 a are connected to the side connection portions 53 and 53 in contact with the peripheral edge of the seat back panel 31. In portions other than these connecting portions 51, 51, 53, 53, the skeleton assembly 41 is disposed so as to recede with a gap S formed with the rear surface 31 b of the seat back panel 31. The relative position of the skeleton assembly 41 with respect to the seat back panel 31 is maintained at least in a non-sitting state by the surface shape of the skeleton assembly 41 facing the seat back panel 31. That is, the surface shape of the plate-like skeleton member 43 facing the seat back panel 31 matches the rear surface 31b of the seat back panel 31 at the upper and side connecting portions 51, 51, 53, 53, and retreats at the other portions. The shape is made. Therefore, when the seat back panel 31 and the skeleton assembly 41 are connected to each other at the upper and side connection portions 51, 51, 53, 53, there is inevitably a gap between the seat back panel 31 and the skeleton assembly 41 in other portions. S will be formed. In this embodiment, the site | part shown with the code | symbol 55 corresponding to the upper part and side part connection part 51,51,53,53 in the frame | skeleton assembly 41 respond | corresponds to the peripheral part of this invention. Further, a portion indicated by reference numeral 57 provided corresponding to a position for mainly receiving the seated person's back of the seat back panel 31, that is, a horizontal portion 47b of the basic skeleton member 45 which is a substantially X-shaped intersecting portion, and The site | part comprised by the center part 49a is equivalent to the center support site | part of this invention. As shown in FIGS. 6 and 7, at least when not seated, the central support portion 57 is separated from the seat back panel 31.
In addition, the connection means of the seat back panel 31 and the skeleton assembly 41 is not particularly limited, and various means such as screwing can be employed.

  The seat back panel 31 and the skeleton assembly 41 arranged in this positional relationship operate as follows when seated. When a seated person's backrest load acts on the seatback panel 31, the seatback panel 31 flexes backward while the center enters the gap S, and elastically receives the seated person's backrest load. The backrest load is transmitted from the upper and side connecting portions 51, 51, 53, 53 to the skeleton assembly 41 and supported by the skeleton assembly 41. The rearward deflection of the seat back panel 31 is allowed until the seat back panel 31 hits the central support portion 57. In other words, the gap S is set to a size that allows the seat back panel 31 to be elastically deformed and bent backward, and can hit the central support portion 57 in the elastically deformed state. Therefore, when an excessive load is applied to the seat back panel 31, the seat back panel 31 hits the center support portion 57 as indicated by a two-dot chain line in FIG. 7. As a result, the seat back panel 31 is restricted from further bending, and damage to the seat back panel 31 is suppressed.

  As shown in FIG. 3, the headrest 91 includes a headrest pad 93 on which a seated person leans his head, and a headrest frame 95 that supports the load of the seated person. The headrest frame 95 has a shape in which the upper and lower ends of a pair of support columns 95a and 95a arranged at intervals in the width direction are connected, the upper part is an inverted U shape, and the lower part is V It has a letter shape. The headrest frame 95 is arranged in a state in which the V-shaped lower part is accommodated in the inverted C-shaped part at the upper part of the skeleton assembly 41 of the seat back 21. The headrest frame 95 has a plurality of rod-like shapes provided so as to be substantially orthogonal to the support column portions 95a and 95a from the both expanded portions 49b and 49b of the upper part 49 of the basic skeleton member 45 constituting the skeleton assembly 41. Joined to the connecting member 97 and connected to the skeleton assembly 41 in a state of being sandwiched from both sides in the width direction. The headrest frame 95 is covered with a shield member 99 to form a headrest frame assembly 96. The shield member 99 can be formed integrally with the back shield 61 (see FIG. 3 and the like). A headrest pad 93 is attached to the front side of an upper portion of the inverted U-shape of the headrest frame 95 (headrest frame assembly 96). The headrest pad 93 is formed by covering a pad body made of a molded body such as urethane foam with a skin material such as fabric or leather.

As shown in FIG. 5, the seat cushion 71 includes a seat cushion pad 73 that forms a seating surface 71 a, a seat cushion panel 77 that receives a seated person's load, and a cushion frame 81 that supports the seated person's load.
The cushion frame 81 includes a pair of plate-like side frames 83 and 83 erected along the front-rear direction on both sides of the seat cushion 71, and a connecting rod 85f that connects the side frames 83 and 83 at the front-rear position. 85r. Connection portions 83a and 83a projecting upward are formed at the rear ends of the side frames 83 and 83, respectively. The connecting portions 83a and 83a are connected to a connecting portion 41a provided at the lower end portion of the skeleton assembly 41 of the seat back 21. The side frames 83 and 83 are covered with resin shield members 87 and 87.
The seat cushion panel 77 is made of a plate-like member having a mesh structure made of a resin such as polypropylene. In the seat cushion panel 77, the upper surface 77a has a three-dimensional surface shape corresponding to the shape from the seated person's buttocks to the thigh, and the position to receive the buttocks is recessed. A latching portion 77b that is bent downward is formed at the rear end portion of the seat cushion panel 77, and the latching portion 77b is hooked on the connecting rod 85r at the rear portion of the cushion frame 81 and is attached to the cushion frame 81. Placed and fixed.
The seat cushion pad 73 has a pad main body formed of foamed urethane or the like, and the pad main body is covered with a skin material such as fabric or leather. The seat cushion pad 73 is detachably attached to the seat cushion panel 77, and the upper surface 73a forms a seating surface 71a. As the attachment structure for detachably attaching the seat cushion pad 73 to the seat cushion panel 77, the above attachment structure for attaching the back pad 23 to the seat back panel 31 can be employed.

According to the vehicle seat 11 having the above configuration, the following operational effects can be obtained.
In the seat back 21, a gap S is set behind the center of the seat back panel 31. In the normal seating state, the seat back panel 31 enters the gap S and bends backward to allow the seat back of the seated person to be back. The drooping load can be received elastically. Therefore, it is easy to ensure good sitting comfort. In addition, when an excessive load is applied to the seat back panel 31, the seat back panel 31 hits the central support portion 57 when it is elastically deformed, so that it can be prevented from being further deformed and broken.

  In the vehicle seat 11, the seat back pad 23 and the seat cushion pad 73 are detachable. Therefore, the seat design and functions such as seating ability can be obtained by replacing the pad member with a different shape. Can be easily changed.

It should be noted that various other embodiments can be considered within the scope of the present embodiment without departing from the gist of the present invention.
For example, in the skeleton part, a central support portion is set corresponding to at least a part of the center of the seat back panel 31 and the central portion is separated from the seat back panel 31. If the peripheral part which contacts with respect to the peripheral part is set, the shape is not limited to the X shape. For example, the skeleton part is set to be H-shaped with a pair of struts that stand up apart in the width direction and a horizontal part that is horizontally placed between the struts, and the horizontal part is set as a central support part. In addition, the upper and lower end portions of the support can be set as the peripheral portion.
Moreover, in the said embodiment, it is comprised with the frame | skeleton assembly 41 which consists of the assembly of the plate-shaped frame | skeleton member 43 mainly responsible for connection with the seat back panel 31, and the basic | foundation frame | skeleton member 45 mainly responsible for supporting a seated person's backrest load. For example, the base skeleton member 45 is omitted by forming a plate-like skeleton member by press-molding a steel plate to achieve both connection with the seat back panel 31 and load support. It is also possible.

Moreover, in the said embodiment, although the structure which attaches the seat back pad 23 with respect to the seat back panel 31 was shown, the seat back pad 23 may be fixed with respect to the seat back panel 31. FIG.
Further, when the seat back pad 23 is detachably attached to the seat back panel 31, the attachment structure is not limited, and various locking means or lock means can be adopted. For example, the rear surface 23b of the seat back pad 23 is provided with a knob that can rotate along the surface direction, and an insertion hole having a shape that matches the shape of the knob is formed in the seat back panel 31, and the knob is used as the insertion hole. A lock structure in which the knob is shifted from the insertion hole to be prevented from coming off by being inserted and rotated can be employed. Further, it is possible to employ means that can hold the opposing planar members such as magnets and hook-and-loop fasteners in a state of being detachably joined.
In addition, when changing the ease of bending at various positions in the surface direction in the seat back panel 31, not only the adjustment of the size of the through hole, but for example, the arrangement of the through hole or the thickness of the seat back panel is adjusted. Or various means such as providing a rib can be employed.

DESCRIPTION OF SYMBOLS 11 Vehicle seat 21 Seat back 21a Backrest surface 23 Seat back pad (pad part)
23a Front 23b Rear 29 Locking projection 31 Seat back panel (panel part)
41 Skeleton assembly (skeleton)
43 plate-like skeleton member 45 basic skeleton member 55 peripheral part 57 central support part 71 seat cushion 91 headrest 93 headrest pad 96 headrest frame assembly

Claims (1)

A skeleton part that supports a backrest load at the time of sitting of a seated person, a pad part that is disposed on the seater position side of the skeleton part to form a backrest surface, and between the pad part and the skeleton part A panel portion made of a resin-made plate-like member that is disposed along the rear surface of the pad portion and elastically receives a load of a seated person through the pad portion;
The skeleton part includes a peripheral part corresponding to at least a part of the peripheral part of the panel part and a central support part corresponding to at least a part of the center of the panel part, and the skeleton part and the panel part are not At the time of sitting, the central support part of the skeleton part and the panel part are separated from each other with a gap, and the peripheral part of the skeleton part and the panel part are in contact with each other and are relatively positioned. The vehicle seat back according to claim 1, wherein the gap is a gap within a range in which the panel portion is elastically deformed by a load acting on the panel portion and abuts against a central support portion of the skeleton portion.

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