JP7200050B2 - seat back - Google Patents

Description

The present invention relates to seatbacks. Specifically, it relates to a seat back that supports the back of a seated person.

Patent Literature 1 discloses a structure in which a seat back is composed of a metal back frame, a foamed urethane back pad covering the back frame, and a fabric back cover covering the back pad.

JP 2018-114983 A

The seat back is configured to elastically support the back of the seated person from the back side with a back pad. However, when the vehicle turns or rides on an uneven road surface, the seated person's head is easily shaken from side to side due to the action of the lateral inertial force input from the vehicle to the seated person. Accordingly, the present invention provides a seatback that prevents the head of a seated person from being shaken easily even if the seated person receives lateral inertial force from a vehicle.

In order to solve the above problems, the seatback of the present invention employs the following means.

That is, the seat back of the present invention is a seat back that supports the back of the occupant, and is assembled to cover the back frame forming the internal skeleton and the back frame from the front so that the back of the occupant is planar. The elastic mat is bridged between the elastic mat, the upper central part of the top plate part that supports the back of the seated person of the elastic mat, and the both side parts of the back frame in the seat width direction, and the upper central part is connected to the back frame. and a pair of restricting members that allow movement in the front-rear direction but restrict movement in the seat width direction by one of the braces extending in the same direction.

According to the above configuration, when a lateral inertial force is applied to the seated occupant from the vehicle, the upper central portion of the elastic mat that supports the back is moved laterally to one side without hindering the cushioning properties of the elastic mat. can be regulated by the tension of the regulating member. As a result, the head of the seated person is less likely to be shaken.

Moreover, the seat back of the present invention may be further configured as follows. Each of the pair of restricting members has a loop shape through which the pin provided on the back surface of the upper central portion is passed, and the movement of the upper central portion in the front-rear direction moves the pin within those loops. However, the movement of the upper central portion in the seat width direction is restricted by abutting the end of one of the loops extending in the same direction with a pin.

According to the above configuration, the pair of restricting members are looped and the pin provided at the upper central portion is passed through the loops, which is a simple configuration. It is possible to obtain a configuration capable of restricting lateral movement.

1 is a perspective view showing a schematic configuration of a seatback according to a first embodiment; FIG. Fig. 2 is a perspective view showing the internal structure of the seatback; FIG. 4 is a rear view of an elastic mat; FIG. 3 is a front view of FIG. 2; FIG. 5 is a cross-sectional view taken along line VV of FIG. 4;

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

<<1st Embodiment>>
(Regarding the schematic structure of the seat back 1)
First, the configuration of a seat back 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. In the following description, when directions such as front, back, up, down, left, and right are indicated, they refer to the respective directions shown in the respective drawings. Further, when the term "seat width direction" is used, it refers to the lateral direction of the seat back 1. As shown in FIG.

As shown in FIGS. 1 and 2, a seat back 1 according to this embodiment is configured as a backrest portion of an automobile seat. The seat back 1 has lower ends on both left and right sides connected to rear ends on both left and right sides of a seat cushion, which serves as a seating portion, via recliners (not shown). Thereby, the seat back 1 can adjust the backrest angle with respect to the seat cushion via the recliner (not shown). A headrest (not shown) serving as a headrest is attached to the upper portion of the seat back 1 .

The seatback 1 is composed of a metal back frame 10, an elastic mat 20 made of polyester thermoplastic elastomer, and a resin backboard 30. As shown in FIG. The back frame 10 functions as a strength member forming the internal framework of the seat back 1 . The elastic mat 20 is assembled to cover the back frame 10 from the front, and functions as a cushion member that elastically supports the back of the seated person in a plane. The backboard 30 is assembled so as to cover the back frame 10 from behind and functions as a decorative plate that improves the design of the back surface of the seat back 1 .

(Regarding the configuration of the back frame 10)
Specifically, as shown in FIG. 2, the back frame 10 includes vertically elongated plate-like side frames 11 forming side frames on both left and right sides of the seat back 1, and is bridged between the upper portions of the side frames 11. An upper frame 12 that forms an upper frame of the seatback 1 and has a laterally elongated plate-like upper frame 12 that has a cross-sectional shape that is bent in a substantially inverted U shape when viewed from the side. Further, the back frame 10 has a laterally long plate-like lower panel 13 bridging between the rear edge portions of the lower ends of the side frames 11 .

Further, the back frame 10 has a pair of left and right support wires 14 projecting forward from the frame main body 10A composed of the side frames 11 and the upper frame 12 . Each of these support wires 14 consists of one steel wire rod extending in the height direction. The upper ends 14A and the lower ends 14B of the support wires 14 are respectively bent rearward and are attached to the upper outer side and the lower outer side of each side frame 11. It is applied and welded.

A horizontally elongated lower mounting plate 15 is welded to the front surface of the lower panel 13 of the back frame 10 so as to be brought into contact with the lower mounting plate 15 from the front. The lower mounting plate 15 has a pair of right and left seating surfaces 15A projecting from the front surface of the lower panel 13 obliquely forward and upward. At the center of each of these seat portions 15A, there is formed a hooking portion 15B which is cut into a generally inverted U-shaped notch in a front view and bent forward into a generally L-shaped plate shape. there is

Rear ends of a pair of left and right compression springs 41 for elastically supporting a lower region of a top plate portion 21 of an elastic mat 20 to be described later are hooked on the seat surface portions 15A of the lower mounting plate 15 respectively. . Specifically, as shown in FIG. 5, each compression spring 41 is an L-shaped plate in which the rear end portion of the wound portion wound in a coil shape protrudes forward from each seat surface portion 15A. It is set in a state in which it is integrally supported from the rear side by each seat surface portion 15A by being passed from above and hooked by each of the hook portions 15B having a shape.

As shown in FIGS. 2 and 4, substantially L-shaped plate-shaped upper mounting brackets 16 projecting forward are welded to the upper surface portions of both the left and right sides of the upper frame 12 of the back frame 10 . . Hooking pins 16A projecting forward are attached to the top mounting brackets 16, respectively, on the front surface portions projecting forward. Each loop wire 50 connected in a loop shape is hooked between these hooking pins 16A and a center pin 25B protruding from the rear surface portion of the upper center portion of the top plate portion 21 of the elastic mat 20, which will be described later. set to the default state. The configuration of each loop wire 50 will be described later in detail. Here, the center pin 25B corresponds to the "pin" of the present invention. Further, each loop wire 50 corresponds to the "regulating member" of the present invention.

(Regarding the configuration of the elastic mat 20)
The elastic mat 20 is made of an injection-molded polyester thermoplastic elastomer. In this embodiment, “Hytrel” (registered trademark) manufactured by DuPont-Toray Co., Ltd. is used as the thermoplastic polyester elastomer. The elastic mat 20 includes a top plate portion 21 having a concavely curved surface that is set to cover the back frame 10 from the front, and a top plate portion 21 that extends obliquely toward the rear and outside from both left and right edges of the top plate portion 21. and a projecting portion 22 .

The elastic mat 20 is made of a polyester thermoplastic elastomer ("Hytrel" (registered trademark) manufactured by DuPont-Toray Co., Ltd.). It is configured so that it can be easily opened to adjust the hardness or to increase air permeability. In addition, the elastic mat 20 is configured to be easily finished with a design that gives a dignified impression, such as by giving a texture or a geometric pattern to the surface thereof, or by two-color molding.

The top plate portion 21 of the elastic mat 20 has a concave curved surface shape capable of planarly supporting the back portion of the seated person so as to wrap it from the rear side. More specifically, the top plate portion 21 has a size that is set so as to cover the side frames 11, the upper frame 12, and the lower panel 13 of the back frame 10 in a planar manner from the front side. Each projecting portion 22 projects obliquely rearward and outward from the left and right edges of the top plate portion 21 to moderately increase the rigidity against bending and twisting of the top plate portion 21 .

As shown in FIG. 3, the elastic mat 20 has an insert wire 23 made of steel wire assembled in a frame shape and integrally formed on the rear surface of the top plate portion 21 . The insert wire 23 has a configuration in which two steel wires are combined to form a substantially frame-like shape in a front view along the peripheral edge of the top plate portion 21 . On the rear surface of the top plate portion 21 of the elastic mat 20, a padding portion 21A protrudes along the area where the insert wire 23 is set so as to embed the insert wire 23 inside. is formed. With the above configuration, the insert wire 23 is provided in a state in which most of it is integrally embedded in the built-up portion 21A.

However, the insert wire 23 is configured such that the hook portions 23A forming the upper regions of the left and right vertical sides of the insert wire 23 protrude from the back surface portion of the top plate portion 21 so as to be partially bent rearward. be. As shown in FIG. 2, these hooking portions 23A are elastically supported from the rear side by tension springs 42 on the two left and right portions of the elastic mat 20 with respect to the support wires 14 provided on the left and right portions of the back frame 10. It is a hook part for assembling to.

Each of the tension springs 42 has its front end hooked on the intermediate portion extending in the height direction of each support wire 14 described above, and its rear end hooked on each hook 23A of the insert wire 23. set. By hooking, the elastic mat 20 is attached to the back frame 10 in a state in which the upper region thereof is elastically supported in a bilaterally symmetric manner via the tension springs 42 . As a result, the elastic mat 20 is configured to elastically support the region around the scapula, which receives a relatively high body pressure from the seated person, from the rear side with good cushioning properties.

Further, in the elastic mat 20, flat plate-shaped lower mounting plates 24 are further provided in the above-described built-up portion 21A at two locations on the left and right of the lower region of the top plate portion 21 through which the lower side portion of the insert wire 23 passes. It is provided as an integrally embedded state. These lower mounting plates 24 are welded to bent portions 23B which are formed on the left and right sides of the lower side of the insert wire 23 and which are bent in the height direction in an undulating manner from behind.

Each lower mounting plate 24 is integrally molded and embedded in the built-up portion 21A of the elastic mat 20 together with each bent portion 23B of the lower side portion of the insert wire 23 welded thereto. Specifically, as shown in FIG. 5, each of the lower mounting plates 24 is integrally molded such that the rear surface of the flat seat surface portion 24A is exposed from the rear surface of the built-up portion 21A. At the center of the seat surface portion 24A of each of the lower mounting plates 24, a substantially inverted U-shaped notch is cut in a front view, and a latching portion 24B is bent rearward into a substantially L-shaped plate shape. is formed.

Front end portions of the pair of left and right compression springs 41 described above are hooked on the seat surface portions 24A of the lower mounting plates 24, respectively. Specifically, each compression spring 41 has its front end portion wound in a coil shape and is attached to each L-shaped plate-like latching portion 24B projecting rearward from each seat surface portion 24A from above. Each seat surface portion 24A is set in a state in which it is integrally applied from the front side by being passed through and hooked.

As described above, the elastic mat 20 is assembled so that its lower region is elastically supported from the rear side of the back frame 10 via the compression springs 41 . As a result, the elastic mat 20 is configured to elastically support the region around the waist, which receives a relatively high body pressure from the seated person, with good cushioning properties without giving a feeling of bottoming out from the rear side.

As shown in FIGS. 2 and 3, the elastic mat 20 further includes an upper central bracket made of press-formed material at the upper central portion of the back side of the top plate portion 21 through which the upper edge of the insert wire 23 passes. 25 are integrally attached by screws 25A. The upper central bracket 25 is formed of a bent plate-like member bent in such a manner that the intermediate portion in the height direction along which the upper side portion of the insert wire 23 passes is recessed rearward. A central pin 25B projecting rearward is attached to the intermediate plate portion of the upper central bracket 25 which is recessed rearward.

Each loop wire 50 connected in an elongated loop shape is hooked on the center pin 25B between each hook pin 16A provided at the upper portion of both left and right sides of the back frame 10 described above. It is Each of the loop wires 50 has a configuration in which one steel wire rod is connected to form an elongated loop shape. Each loop wire 50 has its inner ends passed through the central pin 25B and its outer ends passed through the hook pins 16A on each side.

As shown in FIG. 4, each loop wire 50 has an elongated loop shape extending symmetrically between the central pin 25B and the hooking pins 16A on each side. Each loop wire 50 is always kept in a state in which the elastic mat 20 is pushed forward by the aforementioned tension springs 42 before the seated person's backrest load is applied to the elastic mat 20 by a biasing action. , and is held in a shape extending obliquely from each hooking pin 16A toward the central pin 25B.

The loop wires 50 are pushed backward against the biasing force of the tension springs 42 by applying the load of the seated person's back to the elastic mat 20 . The rearward movement of the elastic mat 20 is prevented by sliding the central pin 25B in the longitudinal direction. Therefore, since the rearward movement of the elastic mat 20 is not hindered by the loop wires 50, the back of the seated person can be elastically supported by the elastic mat 20 with good cushioning without feeling bottoming out.

The loop wires 50 prevent the seat width direction of the elastic mat 20 from moving in the seat width direction when a lateral inertial force is input from the vehicle to the seated person, such as when the vehicle turns or rides on an uneven road surface. I'm going to push it like this and regulate it. That is, when the elastic mat 20 is pushed by the back of the seated person and moved to the right due to the lateral inertial force input from the vehicle, the left hooking pin 16A and the center pin 25B are moved. A loop wire 50 hung between them is stretched between them to restrict the movement of the elastic mat 20 in the same direction.

Similarly, when the elastic mat 20 is pushed by the back of the seated person and moved leftward, the loop wire 50 hooked between the hook pin 16A on the right side and the center pin 25B is stretched therebetween. to restrict the movement of the elastic mat 20 in the same direction. In this way, the lateral movement of the elastic mat 20 that supports the back of the seated person is restricted by the tension of the loop wires 50, so that the head of the seated person is less likely to be shaken. As a result, the line of sight of the seated person can be stabilized even if the lateral movement described above occurs.

The action of suppressing lateral movement of the elastic mat 20 as described above is also exhibited by a pair of right and left extension springs 42 and compression springs 41 that elastically support the elastic mat 20 with respect to the back frame 10 . Specifically, when the elastic mat 20 is pushed by the back of the seated person and moved to the right or to the left, the tension springs 42 and the compression springs 41 are connected to the back frame of the elastic mat 20 in either case. It acts to suppress lateral movement with respect to 10 by elastic force.

5, the front and rear ends of the compression springs 41 are connected to the lower mounting plate 24 of the elastic mat 20 and the lower mounting plate 15 of the back frame 10, respectively. It is configured to be integrally fixed. For this reason, each compression spring 41 elastically suppresses the movement of the elastic mat 20 with respect to the back frame 10 even when the elastic mat 20 is pushed backward and shaken left and right. It is configured to be able to exert a strong resilience.

Therefore, when the elastic mat 20 is laterally moved, the lateral movement of the elastic mat 20 is not abruptly stopped at the position where one of the loop wires 50 is stretched. Due to the restraining force exerted by the elastic force exerted by 41, the lateral movement of the elastic mat 20 can be restrained gradually so as to be restrained strongly.

(Regarding the configuration of the backboard 30)
The backboard 30 includes a flat back plate portion 31 that is set to cover the back frame 10 from behind, and an overhang portion 32 that extends forward from the entire peripheral edge of the back plate portion 31 in a flange shape. have. The back plate portion 31 has a size set so as to cover the side frames 11 and the upper frame 12 of the back frame 10 from behind.

The protruding portion 32 is shaped to protrude forward from the entire peripheral edge of the back plate portion 31 , increases the rigidity of the back plate portion 31 against bending and twisting, and covers the peripheral side surfaces of the back frame 10 . The backboard 30 is set in such a manner as to cover the back frame 10 from the rear, and is integrally fixed by hooking the back board 30 on the back frame 10 from the rear or by snap-fitting. be.

(summary)
In summary, the seat back 1 according to this embodiment has the following configuration. That is, a seat back (1) that supports the back of a seated person includes a back frame (10) that forms an internal skeleton, and a back frame (10) that is assembled to cover the back of the seated person from the front. and an elastic mat (20) that elastically supports the back of the seated person on the elastic mat (20), between the upper central portion of the top plate portion that supports the back portion of the seated person and both side portions of the back frame (10) in the seat width direction A pair of regulating members (50) which are respectively bridged and which allow movement in the longitudinal direction with respect to the back frame (10) at the upper center portion but regulate movement in the seat width direction by one of the struts extending in the same direction.

According to the above configuration, the upper center of the elastic mat (20) that supports the back when the lateral inertial force from the vehicle is input to the seated person without impairing the cushioning properties of the elastic mat (20). Lateral movement of the part can be restricted by the tension of one restricting member (50). As a result, the head of the seated person is less likely to be shaken.

Also, a pair of regulating members (50) each form a loop shape through which a pin (25B) provided on the rear surface of the upper central portion is inserted, and the movement of the upper central portion in the front-rear direction is controlled by these members. The movement of moving the pin (25B) within the loop allows it to escape, but the movement of the upper central portion in the seat width direction is restricted by abutting the pin (25B) against the end of one of the loops extending in the same direction. .

According to the above structure, the cushioning property of the elastic mat (20) can be improved by a simple structure in which the pair of regulating members (50) are looped and the pin (25B) provided at the upper central portion is passed through the loops. It is possible to obtain a configuration that can restrict the lateral movement of the upper central portion without hindrance.

<<About other embodiments>>
As described above, the embodiment of the present invention has been described using one embodiment, but the present invention can be implemented in various forms other than the above embodiment.

1. The seat back of the present invention can be widely applied to seats provided for vehicles other than automobiles, such as railways, and various vehicles such as aircraft and ships. In addition to vehicle seats, seat backs can be widely applied to various seats such as spectator seats and massage seats installed in various facilities such as sports facilities, theaters, concert venues, and event venues. It is.

2. The elastic mat may be made of a polyester thermoplastic elastomer other than "Hytrel" (registered trademark) manufactured by DuPont-Toray. It may also be made of rubber or other resin material.

3. A pair of regulating members for regulating the movement of the upper center portion of the elastic mat in the seat width direction with respect to the back frame by means of struts are made of looped wire or looped band material. Also good. The pair of restricting members are bridged between the upper central portion of the elastic mat and both side portions of the back frame in the seat width direction, and allow the upper central portion to move in the front-rear direction with respect to the back frame by bending, As long as the movement in the seat width direction is regulated by one of the braces, the member may not be formed of a member connected in a loop shape.

1 seatback 10 back frame 10A frame body 11 side frame 12 upper frame 13 lower panel 14 support wire 14A upper end 14B lower end 15 lower mounting plate 15A seat surface 15B hook 16 upper mounting bracket 16A hook pin 20 Elastic mat 21 Top plate portion 21A Overhanging portion 23 Insert wire 23A Hooking portion 23B Bending portion 24 Lower mounting plate 24A Seat portion 24B Hooking portion 25 Upper central bracket 25A Screw 25B Central pin (pin)
30 backboard 31 back plate portion 32 projecting portion 41 compression spring 42 extension spring 50 loop wire (restricting member)

Claims (1)

A seat back that supports the back of a seated person,
a back frame forming an internal skeleton;
an elastic mat that is assembled to cover the back frame from the front and elastically supports the back of the seated person in a plane;
The elastic mat is bridged between the upper central portion of the top plate portion that supports the back of the seated person and both side portions of the back frame in the seat width direction, and the upper central portion of the elastic mat is bridged between the back frame and the back frame. a pair of restricting members that allow movement but restrict movement in the seat width direction by one of the struts extending in the same direction ;
Each of the pair of regulating members has a loop shape through which a pin provided on the back surface of the upper central portion is inserted, and the movement of the upper central portion in the front-rear direction is controlled within the loop by the pin. but the movement of the upper central portion in the width direction of the seat is restricted by abutting the end of one of the loops extending in the same direction with the pin .

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