seat backrest

Abstract

A seat back capable of preventing a finger from entering a seat interior from a tip of a back plate. A seat back (1) has a back plate (40) as a decorative plate on a back surface. The seat back (1) has a back frame (10) that supports a load of a seated person, a back cushion (50) that is assembled to a front portion of the back frame (10) to elastically support the load of the seated person, an intermediate plate (30) that is interposed between the back cushion (50) and a hinge portion of a peripheral edge of the back plate (40), and a back cover (60) that covers across the back cushion (50) and the intermediate plate (30).

Description

Technical Field

[0001] This invention relates to a seat back. More specifically, it relates to a seat back that supports the back of a seated person. Background Technology

[0002] Patent Document 1 discloses a seat back with a back panel serving as a decorative panel on the back. The seat back has a pair of upper and lower auxiliary frames arranged across the width of the seat on each side frame of the backrest frame, which forms the internal skeleton. The back panel is assembled to the backrest frame from the rear by claw-fitting relative to each auxiliary frame.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-142913 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In Patent Document 1, the periphery of the back panel of the seat backrest aligns with the backrest cushion assembled to the backrest frame. Consequently, when an occupant places their fingers on the end of the back panel, it is possible to push aside the backrest cushion and allow their fingers to enter the interior of the seat backrest. Therefore, the present invention provides a seat backrest capable of preventing fingers from entering the interior of the seat from the end of the back panel.

[0008] Technical solutions for solving the problem

[0009] To address the aforementioned issues, the seat back of the present invention employs the following methods.

[0010] That is, the seat back of the present invention has a back panel that serves as a decorative panel on the back side. The seat back has: a backrest frame that supports the load of the seated person; a backrest cushion that is assembled to the front of the backrest frame and elastically supports the load of the seated person; a middle plate that is sandwiched between the backrest cushion and the periphery of the backrest panel; and a backrest cover that covers the backrest cushion and the middle plate.

[0011] According to the above structure, since the periphery of the back panel mates with the middle panel, the mating area will not expand when fingers are placed on it, thus preventing fingers from entering. Furthermore, by covering the middle panel and the backrest cushion with a backrest cover, fingers can also be prevented from entering.

[0012] Alternatively, the seat back of the present invention can also be configured as follows: the end of the backrest cover is introduced between the middle plate and the back plate.

[0013] According to the above structure, the end of the backrest cover can be introduced into the inside of the back panel and fixed in an aesthetically pleasing manner.

[0014] Alternatively, the seat back of the present invention can also be configured as follows: A pair of intermediate plates are provided on both outer sides of the backrest frame in the seat width direction and fixed to the side frames on both sides of the backrest frame. A back panel is provided across the pair of intermediate plates and fixed to the backrest frame and / or the pair of intermediate plates.

[0015] According to the above structure, each intermediate plate can prevent fingers from entering from the side edges of the back panel in the seat width direction.

[0016] Alternatively, the seat back of the present invention may also be configured as follows: The back panel has: a first connecting portion, which is connected to the backrest frame; and a second connecting portion, which is connected to the backrest frame and / or the middle plate with a weaker connecting force than the first connecting portion. By applying an excessive load to the back panel from the front of the seat, the second connecting portion disengages from the connected state before the first connecting portion.

[0017] According to the above structure, by disengaging the second coupling from the engaged state, excessive load from the front of the seat can be released. Furthermore, by providing the second coupling, the position on the backrest that facilitates load release can be easily controlled.

[0018] Alternatively, the seat back of the present invention can also be configured as follows: a first connecting portion is connected to the upper frame of the backrest frame, and a second connecting portion is connected to a pair of intermediate plates at a position lower than the first connecting portion.

[0019] Based on the above structure, the connection at the point where it is joined, which is lower than the upper frame of the back panel, is easy to disengage. This facilitates the release of loads from areas of high body pressure experienced by the occupant.

[0020] Alternatively, the seat back of the present invention can also be configured as follows: The first connecting portion is configured such that a snap-fit ​​clip detachably mounted on the back panel inserts from the rear into an insertion hole in the backrest frame, and is secured to the periphery of the insertion hole on both sides in a direction orthogonal to the insertion direction by snap-fit ​​fittings. The second connecting portion is configured such that a claw extending from the back panel inserts from the rear into a connecting hole in the middle plate, and is secured to the periphery of the connecting hole only on one side in a direction orthogonal to the insertion direction by snap-fit ​​fittings.

[0021] According to the above structure, the first joint can be securely engaged with a simple mechanism where only the snap clip is inserted from the rear. Furthermore, by making the snap clip detachable, the back panel can be easily removed from the backrest frame, improving maintainability.

[0022] Alternatively, the seat back of the present invention can also be configured as follows: The snap-fit ​​mounting portion opens upwards so that the snap-fit ​​can be inserted from above.

[0023] According to the above structure, when an excessive load is applied from the front of the seat, the buckle is not easily disengaged from the back panel. Furthermore, it can be configured such that even if the back panel is subjected to a lifting force from below due to the aforementioned load, the buckle mounting portion is not easily disengaged from the buckle.

[0024] Alternatively, the seat back of the present invention can also be configured as follows: The middle plate extends along the side frame between the upper and lower frames of the backrest frame. The second joint has: a middle joint, located below the first joint; and a lower joint, located below the middle joint, joined with a stronger joining force than the middle joint. By applying an excessive load to the back panel from the front of the seat, the middle joint disengages from the joined state before the lower joint.

[0025] Based on the above structure, the intermediate joint, which can more easily apply body pressure to the seated person, is easier to disengage. This allows for a more appropriate release of the load applied to the seated person.

[0026] Alternatively, the seat back of the present invention can also be configured as follows: A central joint portion is provided at multiple locations in the vertical direction.

[0027] Based on the above structure, the intervals between the intermediate joints can be narrowed. This allows the back plate to be properly joined in a manner that minimizes gaps at the mating points with the intermediate plates. Attached Figure Description

[0028] Figure 1 This is a perspective view of the seat back according to the first embodiment.

[0029] Figure 2 It is a 3D image showing the backrest cover of the seat back being transparent.

[0030] Figure 3 This is a rear view of the seat back.

[0031] Figure 4 It is an exploded 3D view of the backrest frame, side panels, and back panel.

[0032] Figure 5 This is an exploded 3D view of the side panels and back panel from the front.

[0033] Figure 6 It's enlarged. Figure 5 A three-dimensional view of the clip mounting part.

[0034] Figure 7 This is a rear view of the seat back with the back panel removed.

[0035] Figure 8 yes Figure 3 Sectional view along line VIII-VIII.

[0036] Figure 9 yes Figure 3 A sectional view along the IX-IX line.

[0037] Figure 10 yes Figure 3 XX-line sectional view.

[0038] Figure 11 yes Figure 3 Sectional view along line XI-XI.

[0039] Figure 12 yes Figure 3 Sectional view along line XII-XII.

[0040] Figure 13 It's enlarged. Figure 12 A sectional view of the mounting structure of the clip. Detailed Implementation

[0041] The following uses Figures 1-13 The method for carrying out the present invention will be described. In the following description, when referring to directions such as front, back, up, down, left, and right, it refers to the directions shown in the figures.

[0042] <First Implementation>

[0043] First, the structure of the seat backrest 1 according to the first embodiment of the present invention will be described. The seat backrest 1 according to this embodiment is configured as the backrest of a seat for occupants of a car. Figures 1-2 As shown, the seat back 1 includes: a frame-shaped backrest frame 10 that supports the load of the occupant; a backrest cushion 50 assembled to the front of the backrest frame 10; a backrest cover 60 that covers the backrest cushion 50 from the front; and a back panel 40 assembled to the back of the backrest frame 10. The seat back 1 can elastically support the load of the occupant through the backrest cushion 50. The back panel 40 is a decorative panel made of resin and has a concave, curved shape that is recessed forward. The back panel 40 is disposed across the two outer sides of the backrest frame 10 in the seat width direction.

[0044] In addition, such as Figure 2 and Figure 4 As shown, the seat back 1 has a pair of side panels 30 assembled from the rear to the left and right sides of the backrest frame 10 and joined to the left and right ends of the back panel 40 from the front. Each side panel 30 is a long, longitudinally plate-like component extending along the height of each side of the backrest frame 10. Each side panel 30 is made of resin and has a U-shaped cross-section that opens forward when viewed from above (see reference). Figures 9-11 Each side panel 30 has a structure that extends outward in the width direction of the seat compared to each side of the backrest frame 10. The front surface of each side panel 30 supports the rear ends of the backrest cushions 50 that cover both sides of the backrest frame 10 from the rear.

[0045] As described above, the front surface of each side panel 30 abuts against the backrest cushion 50, and its rear surface abuts against the back panel 40. That is, each side panel 30 is arranged such that it is sandwiched between the left and right ends of the back panel 40 and the rear ends of the left and right sides of the backrest cushion 50 in the front-rear direction. Furthermore, a backrest cover 60 extends across each side panel 30 from the front of the seat, covering the backrest cushion 50 and the abutment portions of each side panel 30 and the backrest cushion 50 from the outside. The end of the backrest cover 60 is inserted and fixed inside through the gap between each side panel 30 and the back panel 40. The backrest cover 60 prevents fingers from entering through the abutment portions of each side panel 30 and the backrest cushion 50.

[0046] The mating portions of each side panel 30 and the back panel 40 are configured as mating portions where rigid materials meet each other. Therefore, unlike the structure where the back panel 40 and the backrest cushion 50 are directly mated, when an occupant's fingers rest on the mating portions of the back panel 40 and each side panel 30, the gap between these mating portions does not widen, preventing fingers from entering the interior of the back panel 40. Here, the side panel 30 corresponds to the "intermediate panel" of this invention.

[0047] <Backrest Frame 10>

[0048] The specific structure of the seat back 1 will be described below. The backrest frame 10 is made of metal. The backrest frame 10 has: longitudinally elongated plate-shaped side frames 13 that form the side skeletons on the left and right sides; a transversely elongated plate-shaped upper frame 11 that is erected between the upper parts of each side frame 13; and a transversely elongated plate-shaped lower frame 12 that is erected between the lower parts of each side frame 13. Each side frame 13 has inclined backplates 14 on its lower left and right outer sides that are connected to the seat cushion (not shown). The upper frame 11 forms the upper skeleton and, when viewed from the side, has a U-shaped cross-section that opens to the rear (see reference). Figure 12 The seat backrest 1 is configured such that a headrest (not shown) is mounted on its upper part to support the head of the occupant. The upper frame 11 has two brackets 15 on its upper surface that are arranged side by side in the width direction of the seat, into which headrest support rods (not shown) are inserted from above (see reference). Figure 2 ).

[0049] <Bracket 20>

[0050] like Figure 4 As shown, the backrest frame 10 has brackets 20 welded across each side frame 13 in the form of a U-shaped opening covering the upper frame 11 from the rear. The brackets 20 have: a transversely elongated plate-shaped cover portion 21 disposed behind the upper frame 11; and welding portions 22 extending from the left and right ends of the cover portion 21 and welded to the upper part of each side frame 13. The brackets 20 are integrally formed with the backrest frame 10 by being welded to each side frame 13 through a portion of the periphery of each welding portion 22.

[0051] The bracket 20 has: circular insertion holes 23, symmetrically positioned on the left and right sides of the cover 21; and rectangular locking holes 24, respectively located on the lower part of each welded part 22. The upper part of the back plate 40 is secured by a clip C (see below). Figures 5-6 The clips 21 are coupled to the insertion holes 23. Each insertion hole 23 is formed in the rearwardly protruding portion of the cover 21. Thus, each clip C can be easily inserted into the insertion hole 23. The upper part of each side plate 30 is connected by a hook 31 (see reference). Figure 5 It is combined with each locking hole 24.

[0052] <Side panel 30>

[0053] Each side panel 30 has a basic structural structure that is symmetrical to the other side. Therefore, the following, as an example, describes... Figures 4-5 and Figure 7 The structure of the side panel 30, which is arranged on the left side, will be described as shown. Figure 5 As shown, the side panel 30 has a hook 31 extending forward from the upper region of its front surface portion and three claws 32 formed on its inner surface portion. Each claw 32 extends forward from the aforementioned inner surface portion and is shaped to extend outward in the direction of seat width.

[0054] The hook 31 is formed in a generally J-shaped form extending laterally from the front surface of the side panel 30 in a side view. The hook 31 is configured to engage with the locking hole 24 on the left side of the bracket 20 from the rear, in a locking state to prevent detachment. The three claws 32 are arranged at intervals in the height direction from the middle to the bottom of the side panel 30. Each claw 32 is engaged with the inner edge of the rear edge of the side frame 13 that bends inward in the seat width direction. As described above, each side panel 30 can be properly engaged with each side frame 13 in a way that minimizes gaps within a wide range in the height direction. The side panel 30 is assembled with respect to the backrest frame 10 by means of the hook 31 and the claws 32.

[0055] In addition, such as Figure 4 As shown, the side panel 30 has: a fixing portion 33 that fixes the end of the backrest cover 60 to its rear side; and three rectangular engagement holes 34 that engage with the left end of the back panel 40 from the rear. The three engagement holes 34 are arranged at intervals in the height direction from the middle to the bottom of the side panel 30. Each engagement hole 34 is formed in a rearwardly protruding portion of the side panel 30. Thus, the back panel 40 can easily engage with each engagement hole 34. The fixing portion 33 is a concave portion extending along the height direction of the side panel 30, and it opens forward at each point. The fixing portion 33 is formed on the outer side in the seat width direction, which is closer to the engagement holes 34 than the engagement holes 34.

[0056] like Figure 9As shown, the end of the backrest cover 60 is covered along the outer surface of the side panel 30. The covered end of the backrest cover 60 is fixed to the back of the side panel 30 by inserting a resin trim 61, which is sewn into the fixing part 33 in the form of a long strip extending along its front end. Thus, the end of the backrest cover 60 is fixed in a state where it is introduced into the back of the side panel 30. The fixing part 33 is covered by the back panel 40 from the rear when assembled to each side panel 30 from the rear. Thus, the end of the backrest cover 60 is configured to be introduced into the inside from the gap between the side panel 30 and the back panel 40. Thus, the end of the backrest cover 60 can be aesthetically fixed to each fixing part 33.

[0057] <Backplate 40>

[0058] like Figure 5 As shown, the back panel 40 has: a snap-fit ​​mounting portion 41 for detachably mounting a snap-fit ​​clip C that is inserted into the bracket 20 from the rear; and a middle connecting portion 42 and a lower connecting portion 43 for engaging with each side panel 30. Figure 5 As shown, the clip mounting portions 41 are arranged at two points spaced apart in the left-right direction along the upper edge of the back plate 40. Figure 6 As shown, the snap-on mounting portion 41 is a hollow box shape that extends forward from the front surface of the back plate 40. Each snap-on mounting portion 41 has: a circular fitting hole 41a that extends through the center of its front surface in the front-rear direction; an opening portion 41c that extends upward from the fitting hole 41a; and a narrow portion 41b that narrows the width of the hole in the left-right direction at the boundary between the fitting hole 41a and the opening portion 41c.

[0059] like Figure 8 and Figure 13 As shown, the clip C has: an arrow-shaped insertion portion C1; a cylindrical fitting shaft C2 formed at the center of the base end of the insertion portion C1 and extending axially; and a seat portion C3 extending in a flange shape from the end of the fitting shaft C2. The fitting shaft C2 is configured to be wider radially than the narrow portion 41b of the clip mounting portion 41. Figure 6 As shown, with the insertion part C1 facing forward, the snap clip C is assembled such that the fitting shaft C2 is inserted from above into the fitting hole 41a of the snap clip mounting part 41. Thus, the fitting shaft C2 elastically presses against the widened narrow part 41b and embeds itself into the fitting hole 41a, and is positioned such that the base end of the insertion part C1 and the seat surface C3 clamp the periphery of the fitting hole 41a in the front-back direction.

[0060] like Figure 13 As shown, the insertion portion C1 of each clip C installed on each clip mounting portion 41 is inserted into the insertion hole 23 of each bracket 20 from the rear at an angle upward. Thus, as... Figure 8As shown, the two sides of the inserted insertion part C1 in the left and right directions respectively engage with the periphery of the insertion hole 23. This creates a strong binding force between the insertion part C1 and the insertion hole 23, preventing it from falling off. Thus, the upper part of the back plate 40 is assembled to the bracket 20 through a simple assembly method of simply inserting the clip C into the insertion hole 23 from the rear. Furthermore, the clip C is detachable from the clip mounting part 41, allowing the back plate 40 to be easily removed from the bracket 20 while still retaining the clip C, even after inserting the clip C into the bracket 20. This improves the maintainability of the back plate 40. Here, the clip C corresponds to the "first connecting part" of the present invention.

[0061] like Figure 5 As shown, the intermediate joint portion 42 is a long, rib-shaped member extending forward from the front surface of the back panel 40 in the height direction. Two intermediate joint portions 42 are provided at intervals on the left and right sides of the back panel 40 in the height direction. Each intermediate joint portion 42 is located in the middle region of the back panel 40 in the height direction. Each intermediate joint portion 42 has an intermediate claw 42a extending inward from its inner side in the seat width direction (see reference). Figures 9-10 The intermediate joint 42 located on the upper side is positioned closer to the upper frame 11 in the height direction than the lower frame 12. The intermediate joint 42 located on the lower side is positioned closer to the lower frame 12 in the height direction than the upper frame 11.

[0062] like Figure 5 As shown, the lower joint portion 43 is also a long, rib-shaped member extending forward from the front surface of the back panel 40 in the height direction. The lower joint portions 43 are respectively provided on the left and right sides of the back panel 40, located below each intermediate joint portion 42. Each lower joint portion 43 has a lower claw 43a extending inward from its inner side in the seat width direction (see reference). Figure 11 ).

[0063] like Figure 4 As shown, each intermediate joint 42 and each lower joint 43 is inserted from the rear into the joint hole 34 of each side plate 30 to form a joint. Figures 9-10 As shown, the intermediate claw 42a of the inserted intermediate connecting portion 42 engages with the inner edge of the connecting hole 34. The intermediate claw 42a is configured such that the engaging surface 42b, which abuts against the periphery of the connecting hole 34, is inclined forward relative to the engaged abutment surface 34a of the connecting hole 34. Figures 9-10 As shown, in this embodiment, the angle α between the locking surface 42b and the abutting surface 34a is set to approximately 30 degrees. Additionally, as... Figure 11As shown, the lower claw 43a of the inserted lower connecting portion 43 is engaged with the inner edge of the connecting hole 34. The lower claw 43a is configured such that the engaging surface 43b, which abuts against the periphery of the connecting hole 34, abuts against the abutting surface 34a of the connecting hole 34 in a straight front-to-back direction.

[0064] Each intermediate connecting portion 42 and each lower connecting portion 43 is configured such that each intermediate claw 42a and lower claw 43a engages with the corresponding engaging hole 34 of the side plate 30 only on one side in a direction orthogonal to the insertion direction (left-right direction). Therefore, compared to each latching clip C which engages with the respective engaging hole 23 of the bracket on both sides in a direction orthogonal to the insertion direction (left-right direction), each intermediate connecting portion 42 and each lower connecting portion 43 has a weaker engaging force. Furthermore, each intermediate connecting portion 42 has an even weaker engaging force than each lower connecting portion 43 by having an inclined engaging surface 42b of the intermediate claw 42a. Here, the intermediate connecting portions 42 and lower connecting portions 43 correspond to the "second connecting portion" of the present invention.

[0065] With the above structure, for example, when the car is subjected to a rear-end collision and the seat back 1 is subjected to a strong load from the occupant, each intermediate joint 42 will disengage from each side panel 30. Specifically, when the above load is applied, the middle area of ​​the back panel 40 in the height direction is subjected to a relatively high body pressure from the occupant's waist area. Since each intermediate joint 42 connects the aforementioned middle area of ​​the back panel 40 to each side panel 30, the load applied to the occupant's waist area can be appropriately released by disengaging each intermediate joint 42. Furthermore, when an even stronger load is applied, not only each intermediate joint 42, but also each lower joint 43 disengages from each side panel 30. Thus, the load in a large area from the occupant's waist area to the hip area can be released.

[0066] On the other hand, the strong-bonded clips C will not detach from the bracket 20 even under the aforementioned load. Therefore, the back panel 40 will not completely detach from the backrest frame 10, and there is no need to worry about the back panel 40 falling backward. Figure 13 As shown, even if the back plate 40 is subjected to a strong rearward load due to the aforementioned rearward impact, the fitting holes 41a of each clip mounting part 41 are supported by each insertion part C1 and each seat surface C3 in a state that prevents detachment in the front-rear direction. Therefore, the engagement between each clip mounting part 41 and each clip C is difficult to detach.

[0067] Furthermore, even if the back panel 40 is subjected to a strong force that causes it to be lifted from below due to the aforementioned rear impact, it will not detach from the clips C upwards. Specifically, as... Figure 6As shown, each snap-fit ​​clip C is mounted from above to each snap-fit ​​clip mounting part 41, so even if the back plate 40 is lifted, the lower edge of each fitting hole 41a is pressed against each snap-fit ​​clip C. This makes it more difficult for the upper part of the back plate 40 to detach relative to the lifting force.

[0068] In summary, the seat back 1 according to the first embodiment has the following structure. Furthermore, the reference numerals in parentheses below correspond to the structures shown in the above embodiments.

[0069] That is, the seat back (1) according to the first embodiment has a back panel (40) that serves as a decorative panel on the back side. The seat back (1) has: a backrest frame (10) that supports the load of the seated person; a backrest cushion (50) that is assembled to the front of the backrest frame (10) and elastically supports the load of the seated person; a middle plate (30) that is sandwiched between the backrest cushion (50) and the periphery of the back panel (40); and a backrest cover (60) that covers the backrest cushion (50) and the middle plate (30).

[0070] By forming such a structure, since the periphery of the back panel (40) mates with the middle panel (30), the mating part will not expand when fingers are placed on it, thus preventing fingers from entering. In addition, by covering the middle panel (30) and the backrest cushion (50) with a backrest cover (60), fingers can be prevented from entering.

[0071] In addition, the end of the backrest cover (60) is introduced between the middle plate (30) and the back plate (40).

[0072] By forming such a structure, the end of the backrest cover (60) can be introduced into the inside of the back panel (40) and fixed in an aesthetically pleasing manner.

[0073] Additionally, a pair of intermediate plates (30) are provided on both outer sides of the backrest frame (10) in the seat width direction and fixed to the side frames (13) on both sides of the backrest frame (10). A back panel (40) is provided across the pair of intermediate plates (30) and fixed to the backrest frame (10) and / or the pair of intermediate plates (30).

[0074] By forming such a structure, each intermediate plate (30) can prevent fingers from entering from the side edges of the back plate (40) in the seat width direction.

[0075] In addition, the back panel (40) has: a first connecting part (C) that connects to the backrest frame (10); and a second connecting part (42, 43) that connects to the backrest frame (10) and / or the middle plate (30) with a weaker connecting force than the first connecting part (C). By applying an excessive load to the back panel (40) from the front of the seat, the second connecting part (42, 43) disengages from the connected state before the first connecting part (C).

[0076] By forming such a structure, excessive loads from the front of the seat can be released when disengaged from the engaged state via the second connecting parts (42, 43). In addition, by providing the second connecting parts (42, 43), the position of the back panel (40) that facilitates load release can be easily controlled.

[0077] In addition, the first joint (C) is joined to the upper frame (11) of the backrest frame (10), and the second joint (42, 43) is joined to a pair of intermediate plates (30) at a position lower than the first joint (C).

[0078] By forming such a structure, the connection at the point where the back panel (40) is joined lower than the upper frame (11) is easily released. As a result, the load on the parts with high body pressure applied to the seated person is easily released.

[0079] Furthermore, the first connecting part (C) is configured such that the snap clip (C) of the snap clip mounting part (41) detachably mounted on the back panel (40) is inserted into the insertion hole of the backrest frame (10) from the rear, and is locked with the periphery of the insertion hole on both sides in a direction orthogonal to the insertion direction by snap-fit ​​members. The second connecting parts (42, 43) are configured such that the claws extending from the back panel (40) are inserted into the connecting hole of the middle plate (30) from the rear, and are locked with the periphery of the connecting hole only on one side in a direction orthogonal to the insertion direction by snap-fit ​​members.

[0080] By forming such a structure, the first joint (C) can be securely joined with a simple structure in which only the snap clip (C) is inserted from the rear. In addition, the snap clip (C) allows for easy installation and removal, making it easy to remove the back panel (40) from the backrest frame (10) and improving maintainability.

[0081] In addition, the clip mounting part (41) opens upward in such a way that the clip (C) can be inserted from above.

[0082] By forming such a structure, the clip (C) is difficult to detach from the back panel (40) when an excessive load is applied from the front of the seat. In addition, it can be configured such that even if the back panel (40) is subjected to a force that lifts it from below due to the aforementioned load, the clip mounting part (41) is difficult to detach from the clip (C).

[0083] Furthermore, the middle plate (30) is configured to extend along the side frame (13) between the upper frame (11) and the lower frame (12) of the backrest frame (10). The second joints (42, 43) have: a middle joint (42) located below the first joint (C); and a lower joint (43) located below the middle joint (42), which is joined with a stronger joining force than the middle joint (42). By applying an excessive load to the backrest (40) from the front of the seat, the middle joint (42) disengages from the joined state before the lower joint (43).

[0084] By forming such a structure, the intermediate joint (42), where the body pressure of the seated person is easily applied, is more easily disengaged. As a result, the load applied to the seated person can be released more appropriately.

[0085] In addition, the intermediate joint (42) is provided at multiple locations in the vertical direction.

[0086] By forming such a structure, the spacing between the intermediate joints (42) can be narrowed. As a result, the back plate (40) can be properly joined in such a way that gaps are unlikely to occur at the mating parts with the intermediate plate (30).

[0087] <Other Implementation Methods>

[0088] The present invention has been described above using one embodiment, but the present invention can be implemented in various ways in addition to the above embodiment.

[0089] 1. The seat back can also be widely used for seats in various means of transportation other than railways and automobiles, such as airplanes and ships.

[0090] 2. The middle plate can be a side plate that covers the side frame from the rear, or a top plate that covers the top frame from the rear. Alternatively, it can be a structure that continuously covers both the side and top frames from the rear. It can also be a single plate-like component that continuously spans across a pair of left and right side frames. Besides being a pair, the side plate can also be a single-sided structure installed on either the left or right side.

[0091] 3. The back panel can be a structure fixed only to the backrest frame, or a structure fixed only to a pair of middle panels. The first joint can be a structure that uses screws or bolts to attach the back panel to the backrest frame, in addition to clips. The first joint can also be a structure that connects to the side frame or lower frame of the backrest frame. Alternatively, the first joint can also be a structure that connects to the middle panels. The second joint can also be a structure that connects at a higher position than the first joint. The second joint can also be a structure that connects to the backrest frame.

[0092] 4. The intermediate joint can be a structure with only one location in the vertical direction, or a structure with three or more locations. The intermediate claw of the intermediate joint can also be inclined at an angle of less than 30 degrees relative to the abutment surface of the joint hole. In addition, as long as the structure can be locked into the joint hole, it can be inclined at a larger angle. The lower joint can also be a structure with multiple locations in the vertical direction.

[0093] 5. The backrest cover can also be a structure that covers across the back panel.

[0094] 6. The clip can be a structure that is non-removably installed relative to the back panel. The clip can also be a structure that is installed from the left or right or from below relative to the clip mounting part.

[0095] Label Explanation

[0096] 1. Seat backrest;

[0097] 10. Backrest frame;

[0098] 11. Upper frame;

[0099] 12. Lower frame;

[0100] 13 side frames;

[0101] 14. Inclined board;

[0102] 15 brackets;

[0103] 20 brackets;

[0104] 21. Covering section;

[0105] 22 Welding section;

[0106] 23. Insertion hole;

[0107] 24 locking holes;

[0108] 30 side panels (middle panels);

[0109] 31 hooks;

[0110] 32 claws;

[0111] 33. Fixing part;

[0112] 34. Connecting hole;

[0113] 34a Abutment surface;

[0114] 40 Back panel;

[0115] 41. Clip mounting part;

[0116] 41a Fitting hole;

[0117] 41b Narrow section;

[0118] 41c Opening;

[0119] 42. Intermediate joint (second joint);

[0120] 42a intermediate claw;

[0121] 43 Lower joint (second joint);

[0122] 43a lower claw;

[0123] 50 Backrest Cushions;

[0124] 60 Backrest cover;

[0125] 61. Embroidery;

[0126] C-clamp (first connecting part);

[0127] C1 insertion part;

[0128] C2 fitting shaft;

[0129] C3 seat face.

Claims

1. A seat back, wherein the back panel serves as a decorative panel, wherein, The seat back has: The backrest frame serves to support the load of the seated person. The elastic backrest cushion is assembled at the front of the backrest frame to support the load of the seated person. A middle plate, sandwiched between the periphery of the backrest cushion and the periphery of the back panel; and Backrest cover, configured across the backrest cushion and the center plate. The middle plate has a pair of middle plate components disposed on the two outer sides of the backrest frame in the seat width direction. The middle plate component is fixed to the side frames on both sides of the backrest frame. The back panel is disposed between a pair of the intermediate panels and is fixed to at least one of the backrest frame and the intermediate panel components. The back plate has: The first connecting part is connected to the backrest frame by a first connecting force; and The second joint is joined to at least one of the backrest frame and the middle plate component with a second joint force weaker than the first joint force. When a specified load is applied to the back panel from the front of the seat back, the second joint disengages from at least one of the back panel and the middle plate component while the first joint is engaged with the back frame.

2. The seat back according to claim 1, wherein, The end of the backrest cover is positioned between the middle plate and the back plate.

3. The seat back according to claim 1, wherein, The first connecting part is connected to the upper frame of the backrest frame. The second joint is joined to a pair of intermediate plate components on the lower side of the seat back in the vertical direction relative to the first joint.

4. The seat back according to claim 3, wherein, The first joint includes a snap-fit ​​clip that is detachably mounted on the back plate. The buckle is inserted into the insertion hole of the backrest frame from the rear, and is locked to the periphery of the insertion hole on both sides in a direction orthogonal to the insertion direction by buckle fittings. The second joint has claws extending from the back plate. The claw is inserted into the engagement hole of the intermediate plate from the rear and is locked to the periphery of the engagement hole only on one side in a direction orthogonal to the insertion direction by a snap-fit ​​fitting.

5. The seat back according to claim 4, wherein, The seat back is configured such that the buckle mounting portion opens upwards, and the buckle engages from above.

6. The seat back according to any one of claims 3 to 5, wherein, The middle plate extends along the side frame between the upper and lower frames of the backrest frame. The second joint has: The intermediate joint portion is located below the first joint portion; and The lower joint portion is located below the intermediate joint portion and is coupled to the intermediate plate component with a stronger coupling force than that of the intermediate joint portion to the intermediate plate component. When a specified load is applied to the back panel from the front of the seat, the middle joint disengages while the lower joint is engaged with the middle panel component.

7. The seat back according to claim 6, wherein, The intermediate joint has multiple joints arranged in the vertical direction.

8. The seat back according to claim 6, wherein, The intermediate connecting portion has an intermediate claw, and the lower connecting portion has a lower claw. The locking surface of the middle claw is inclined relative to the locking surface of the lower claw.

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