Vehicle seats

Abstract

To provide a vehicle seat which can enhance support performance of a sitting person.SOLUTION: A vehicle seat includes a seat cushion, a seat back, and a back frame supporting the seat back. The back frame has a back board, a first side frame extending in a forward direction of a seat from a first end in a seat width direction of the back board, a second side frame extending in a forward direction of the seat from a second end in the seat width direction of the back board, and a support member extending in the forward direction of the seat and downward from the lower end of the back board.SELECTED DRAWING: Figure 2

Description

[[TECHNICAL FIELD]]

[0001] The present disclosure relates to a vehicle seat. [[BACKGROUND ART]]

[0002] There is known a back frame of a vehicle seat in which two side frames and an upper panel are integrally molded (see Patent Document 1 and Patent Document 2). [[PRIOR ART DOCUMENTS]] [[PATENT DOCUMENTS]]

[0003] [[Patent Document 1]] Japanese Unexamined Patent Publication No. 2000-270961 [[Patent Document 2]] Japanese Unexamined Patent Publication No. 2021-846 [[SUMMARY OF THE INVENTION]] [[Problem to be Solved by the Invention]]

[0004] In the back frame as described above, since there is a space in the central portion, the supporting performance for a seated occupant is insufficient.

[0005] An object of one aspect of the present disclosure is to provide a vehicle seat capable of enhancing supporting performance for a seated occupant. [[Means for Solving the Problem]]

[0006] One aspect of the present disclosure is a vehicle seat (1) including a seat cushion (2), a seat back (3), and a back frame (4) that supports the seat back (3). The back frame (4) includes a back board (41), a first side frame (42) extending forward of the seat from a first end portion of the back board (41) in a seat width direction, a second side frame (43) extending forward of the seat from a second end portion of the back board (41) in the seat width direction, and a support member (45A) extending forward of the seat and downward from a lower end portion of the back board (41).

[0007] With this configuration, the support member (45A) can support the lumbar region of the seated person. Therefore, the support performance for the seated person can be improved.

[0008] In one aspect of this disclosure, the back frame (4) may have a backboard (41) and a pressure plate (46) positioned in front of the seat of the support member (45A). With this configuration, the seated person can be supported by the support member (45A) and the pressure plate (46). Therefore, the support performance for the seated person is improved.

[0009] In one aspect of this disclosure, the pressure plate (46) may be attached to a support member (45A). With this configuration, a member for holding the pressure plate (46) is not required, thus reducing the number of parts in the back frame (4).

[0010] The symbols in the parentheses above are merely examples indicating the correspondence with the specific configurations described in the embodiments described later, and this disclosure is not limited to the specific configurations indicated by the symbols in the parentheses above. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a schematic perspective view of a vehicle seat in an embodiment. [Figure 2] Figure 2 is a schematic exploded perspective view of the back frame of the vehicle seat shown in Figure 1. [Figure 3] Figure 3 is a schematic perspective view of a portion of the back frame shown in Figure 2. [Figure 4] Figure 4 is a schematic perspective view showing the back frame of Figure 3 with the functional components attached. [Figure 5] Figure 5 is a schematic perspective view of the pressure plate in the back frame of Figure 2. [Modes for carrying out the invention]

[0012] Embodiments to which this disclosure applies will be described below with reference to the drawings. [1. First Embodiment] [1-1. Structure] The vehicle seat 1 shown in Figure 1 comprises a seat cushion 2, a seat back 3, a back frame 4, several functional components 5A-5D (see Figure 2), a seat belt 6, a first recliner 7, and a second recliner 8.

[0013] The vehicle seat 1 of this embodiment is used as a seat in a passenger car. In the following description and in each drawing, the directions refer to the direction when the vehicle seat 1 is assembled in a vehicle (i.e., a passenger car). In this embodiment, the width direction of the seat coincides with the left-right direction of the vehicle, and the front of the seat coincides with the front of the vehicle.

[0014] The seat cushion 2 is the part that supports the seated person's buttocks, etc. The seat back 3 is the part that supports the seated person's back. The back frame 4 supports the seat back 3. The back frame 4 is pivotable in the front-to-back direction of the seat relative to the cushion frame (not shown) that supports the seat cushion 2.

[0015] <Back frame> As shown in Figure 2, the back frame 4 includes a backboard 41, a first side frame 42, a second side frame 43, an upper frame 44, a first support member 45A, a second support member 45B, a pressure receiving plate 46, a first connecting plate 47, and a second connecting plate 48.

[0016] The backboard 41, first side frame 42, second side frame 43, upper frame 44, first support member 45A, and second support member 45B are all part of the frame body 4A, which is integrally molded by casting a metal such as aluminum. In other words, the backboard 41, first side frame 42, second side frame 43, upper frame 44, first support member 45A, and second support member 45B are integrated into a single unit.

[0017] <Backboard> The backboard 41 is a panel that constitutes the rear wall of the back frame 4. As shown in Figure 3, the backboard 41 has a plurality of component mounting openings 411A, 411B, 411C, a belt pass 412, a boss 413, and a plurality of auxiliary openings 414A, 414B, 414C, 414D, 414E.

[0018] The first component mounting opening 411A is arranged at the upper right portion (i.e., the right shoulder) of the backboard 41. As shown in Figure 4, the first functional component 5A is fitted into the first component mounting opening 411A. The first functional component 5A is a switch for operating a seat arranged behind the vehicle seat 1.

[0019] The second component mounting opening 411B shown in Figure 3 is arranged at the upper left portion (i.e., the left shoulder) of the backboard 41. As shown in Figure 4, the second functional component 5B is fitted into the second component mounting opening 411B. The second functional component 5B is a switch for operating a seat arranged behind the vehicle seat 1.

[0020] The third component mounting opening 411C shown in Figure 3 is arranged at the lower left portion of the backboard 41. As shown in Figure 4, the third functional component 5C is fitted into the third component mounting opening 411C. The third functional component 5C is a lever mechanism for manually releasing the slide lock of the vehicle seat 1.

[0021] The belt pass 412 shown in Figure 2 is a portion through which the seat belt 6 is inserted inside the frame body 4A (i.e., behind the pressure receiving plate 46 in the seat). As shown in Figure 3, the belt pass 412 is arranged below the first component mounting opening 411A. The belt pass 412 has a pass opening 412A, a first arch 412B, and a second arch 412C.

[0022] The pass opening 412A is an opening provided in the backboard 41. The first arch 412B and the second arch 412C are arranged to straddle the pass opening 412A in front of the pass opening 412A in the seat.

[0023] Specifically, the first arch 412B and the second arch 412C protrude forward from the left and right ends of the path opening 412A, and are strip-shaped portions that connect the left and right ends of the path opening 412A.

[0024] The first arch 412B is positioned above the second arch 412C. Furthermore, the width of the first arch 412B in the direction through which the seat belt 6 passes is greater than the width of the second arch 412C.

[0025] The boss 413 is a bottomed cylindrical portion that protrudes forward from the seat. As shown in Figure 4, the fourth functional component 5D is attached to the boss 413 by fasteners such as clips and bolts. The fourth functional component 5D is a retractor that winds up the seat belt 6. The boss 413 is located below the belt path 412.

[0026] As shown in Figure 3, the first auxiliary opening 414A is located between the first component mounting opening 411A and the second component mounting opening 411B in the seat width direction. The second auxiliary opening 414B is located to the left of the belt path 412. The third auxiliary opening 414C is located between the belt path 412 and the second auxiliary opening 414B in the seat width direction.

[0027] The fourth auxiliary opening 414D is located in the seat width direction between the boss 413 and the third component mounting opening 411C. The fifth auxiliary opening 414E is located below the belt path 412 and to the right of the fourth auxiliary opening 414D.

[0028] The first auxiliary opening 414A, the third auxiliary opening 414C, and the fourth auxiliary opening 414D are arranged vertically so as to pass through the center line of the backboard 41 in the seat width direction.

[0029] <Side frame> The first side frame 42 and the second side frame 43 are panel-shaped members that extend in the vertical direction of the sheet and are arranged apart from each other in the width direction of the sheet.

[0030] The first side frame 42 extends forward from the first end (i.e., the left end) of the backboard 41 in the seat width direction. The second side frame 43 extends forward from the second end (i.e., the right end) of the backboard 41 in the seat width direction. The length of the first side frame 42 and the second side frame 43 in the seat front-rear direction is greater than the length in the seat width direction.

[0031] <Upper frame> The upper frame 44 is a panel-shaped member that extends from the upper end of the backboard 41 toward the front of the seat.

[0032] The upper frame 44 connects the upper end of the first side frame 42 and the upper end of the second side frame 43 in the seat width direction. The upper frame 44 has a belt anchor 441 that protrudes upward from its right end. The seat belt 6 is discharged to the outside of the seat back 3 via the belt anchor 441.

[0033] <Support member> The first support member 45A and the second support member 45B each extend forward and downward from the lower end of the backboard 41. The first support member 45A and the second support member 45B are spaced apart from each other in the width direction of the seat.

[0034] The first support member 45A has a base portion 451 extending forward from the lower end of the main body of the backboard 41, and a reinforcing portion 452 extending downward from the front end of the base portion 451. The second support member 45B also has a base portion 451 and a reinforcing portion 452 similar to those of the first support member 45A.

[0035] <Pressure plate> The pressure-receiving plate 46 shown in Figure 5 is a resin panel that absorbs the weight of the occupant through the pad of the seat back 3.

[0036] The pressure receiving plate 46 is positioned in front of the backboard 41, the first support member 45A, and the second support member 45B. The pressure receiving plate 46 has a plate body 461, a lower mounting portion 462, an upper mounting portion 463, a left mounting portion 464, and a right mounting portion 465.

[0037] As shown in Figure 1, the main board 461 is positioned to cover at least a portion of the backboard 41, at least a portion of the first side frame 42, and at least a portion of the second side frame 43 from the front of the sheet.

[0038] Specifically, the main body of the plate 461 is in contact with the first side frame 42 and the second side frame 43 from the front of the seat. In addition, the main body of the plate 461 covers the functional components 5A, 5B, 5C, and 5D from the front of the seat.

[0039] The lower mounting portion 462 is a portion that extends downward from the lower end of the plate body 461. The lower mounting portion 462 is positioned to cover the first support member 45A and the second support member 45B from the front of the sheet.

[0040] Specifically, the lower mounting portion 462 contacts the reinforcing portions 452 of the first support member 45A and the second support member 45B from the front of the seat. The lower mounting portion 462 is attached to the first support member 45A and the second support member 45B by fasteners such as clips and bolts.

[0041] The upper mounting portion 463 is a part that extends from the upper end of the plate body 461 toward the rear of the seat. The upper mounting portion 463 is positioned to cover the upper frame 44 from above. The upper mounting portion 463 is attached to the upper frame 44 by fasteners such as clips and bolts.

[0042] The left mounting portion 464 is a part that extends from the left end of the main body of the plate 461 toward the rear of the seat. The left mounting portion 464 is positioned to cover the first side frame 42 from the outside in the width direction of the seat. The left mounting portion 464 is attached to the first side frame 42 by fasteners such as clips and bolts.

[0043] The right mounting portion 465 shown in Figure 5 is a part that extends from the right end of the plate body 461 toward the rear of the seat. The right mounting portion 465 is positioned to cover the second side frame 43 from the outside in the width direction of the seat. The right mounting portion 465 is attached to the second side frame 43 by fasteners such as clips and bolts.

[0044] <Board Plate> The first connecting plate 47 shown in Figure 2 is superimposed on the lower end of the first side frame 42 from the outside in the seat width direction. Specifically, the first connecting plate 47 is attached to the lower end of the first side frame 42 by fasteners such as bolts.

[0045] Furthermore, the first reclining seat 7 is attached to the first connecting plate 47. The first reclining seat 7 is positioned below the lower end of the first side frame 42. The first connecting plate 47 is connected to the cushion frame via the first reclining seat 7.

[0046] The second connecting plate 48 is superimposed on the lower end of the second side frame 43 from the outside in the seat width direction. Specifically, the second connecting plate 48 is attached to the lower end of the second side frame 43 by fasteners such as bolts.

[0047] Furthermore, a second recliner 8 is attached to the second connecting plate 48. The second recliner 8 is positioned below the lower end of the second side frame 43. The second connecting plate 48 is connected to the cushion frame via the second recliner 8.

[0048] <Seat belt> The seat belt 6 is wound onto the fourth functional component 5D (i.e., the retractor) between the backboard 41 and the pressure plate 46.

[0049] The seat belt 6 is stretched inside the seat back 3 between the belt anchor 441 of the backboard 41 and the fourth functional component 5D. Guided by the belt anchor 441, the seat belt 6 is pulled out from and pulled back into the seat back 3.

[0050] <Reclining chair> The first recliner 7 and the second recliner 8 are known devices that connect the back frame 4 to the cushion frame so that it can swing in the seat-forward and backward directions.

[0051] [1-2. Effects] According to the embodiments described in detail above, the following effects can be obtained. (1a) The first support member 45A and the second support member 45B can support the lumbar region of the seated person. Therefore, the support performance for the seated person can be improved.

[0052] (1b) By positioning the pressure receiving plate 46 in front of the seats of the first support member 45A and the second support member 45B, the seated person can be supported by the first support member 45A, the second support member 45B and the pressure receiving plate 46. As a result, the support performance for the seated person is improved.

[0053] (1c) Since the pressure plate 46 is attached to the first support member 45A and the second support member 45B, a member for holding the pressure plate 46 is not required, thus reducing the number of parts in the back frame 4.

[0054] [2. Other Embodiments] While embodiments of this disclosure have been described above, it goes without saying that this disclosure is not limited to the embodiments described above and can take various forms.

[0055] (2a) In the vehicle seat of the above embodiment, the back frame does not necessarily have to have two support members. For example, the back frame may have one or three or more support members.

[0056] (2b) In the vehicle seat of the above embodiment, the pressure receiving plate does not necessarily have to be attached to the support member. Also, the pressure receiving plate does not necessarily have to be positioned in front of the seat on the support member.

[0057] (2c) The vehicle seat of the above embodiment can also be applied to seats used in automobiles other than passenger cars, and seats used in vehicles other than automobiles, such as railway cars, ships, and aircraft.

[0058] (2d) The functions of one component in the above embodiment may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, some parts of the configuration of the above embodiment may be omitted. Also, at least some parts of the configuration of the above embodiment may be added to, substituted for, or otherwise used in the configuration of other above embodiments. Any aspect of the technical concept specified by the wording of the claims is an embodiment of the present disclosure. [Explanation of Symbols]

[0059] 1...Vehicle seat, 2...Seat cushion, 3...Seat back, 4...Back frame, 4A...Frame body, 5A-5D...Functional parts, 6...Seat belt 7...First recliner, 8...Second recliner, 41...Backboard 42...First side frame, 43...Second side frame, 44...Upper frame, 45A, 45B... Support members, 46... Pressure receiving plate, 47... First connecting plate, 48...Second connecting plate, 411A-411C...Parts mounting opening, 412...Belt path, 412A...path opening, 412B, 412C...arch, 413...boss, 414A-414E... Auxiliary opening, 441... Belt anchor, 451... Base, 452...Reinforcement part, 461...Plate body, 462...Lower mounting part, 463...Upper mounting part, 464...Left mounting part, 465...Right mounting part.

Claims

1. Seat cushion and, The seatback and, A back frame that supports the aforementioned seat back, Equipped with, The aforementioned back frame is Backboard and A first side frame extending forward from the first end of the backboard in the seat width direction, A second side frame extending forward from the second end of the backboard in the seat width direction, A support member having a base portion extending forward from the lower end of the backboard, and a reinforcing portion extending downward from the front end of the base portion, A vehicle seat having [a certain feature].

2. A vehicle seat according to claim 1, The back frame has a pressure-receiving plate positioned in front of the backboard and the support member of the seat, for use as a vehicle seat.

3. A vehicle seat according to claim 2, The pressure-receiving plate is a seat for a vehicle, attached to the support member.

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