JP2018079812A - seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce or eliminate discomfort caused by reduction of a sinking amount of a cushion and feld by a seating person in a situation that a back part direction component of a weight of the seating person increases and a seating part direction component decreases when a back part of a seat is reclined rearward.SOLUTION: A seat includes: a seat part 2 including a seat part front frame 21 at a front end part; a back part frame 4 which is provided so as to tilt relative to the seat part 2; an S spring 5 in which one end part is engaged with a front engagement part 12 provided at the seat part front frame 21 and the other end part is engaged with a rear engagement part 32 of a lower end part of the back part frame 4; and a distance adjustment mechanism which changes a distance between an engagement position of the front engagement member 12 and an engagement position of the rear engagement member 32 in conjunction with tilting of the back part frame 4.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seat. In particular, the present invention relates to a seat having a reclining function and suitable for a vehicle. Here, examples of the vehicle include a train, an automobile, a bus, a ship, and an airplane. In addition to vehicles, it is also suitable for uses such as for theaters.

In reclining where the back part of the seat is tilted backward, the seated person's body is pushed forward due to a slip of the seated person's body due to the difference between the tilting fulcrum of the back part and the tilting fulcrum of the seated person. Deterioration is likely to occur.
For this reason, a seat has been proposed in which the rear side of the seat portion is depressed in conjunction with a reclining operation in which the back portion of the seat is tilted backward.

JP2000-201760

Since the seat of Patent Document 1 is a mechanism that lowers the height of the rear portion of the seat frame in conjunction with the reclining operation of the back portion, the cushioning property of the seat portion does not change before and after the reclining. However, when the back portion of the seat is tilted rearward, the component in the seat back direction of the seat decreases as the component in the seat back direction increases in the weight of the seated person. Thereby, since the weight of the seated person who joins the cushion is reduced, the sinking amount of the cushion due to the weight is reduced, and the seated person is likely to feel uncomfortable.
An object of the present invention is to reduce or eliminate the above-mentioned uncomfortable feeling.

The configuration of the present invention is described in the following [1] to [6]. In this section ([Means for Solving the Problems]) and the next section ([Effects of the Invention]), reference numerals are given for ease of understanding, and the present invention is configured by reference numerals. It is not intended to be limited.
[1] Configuration 1
A seat 2 having a front frame 21 at the front end;
A back frame 4 provided to be tiltable with respect to the seat 2;
A cushion spring having one end hooked to the front hooking portion 12 provided in the seat front frame 21 and the other end hooked to the rear hooking portion 32 provided in the lower end portion of the back frame 4. 5 and
A distance adjusting mechanism for changing the distance between the latching position by the front latching part 12 and the latching position by the rear latching part 32 in conjunction with the tilt of the back frame 4;
A seat characterized by having.
As a spring, one end is hooked to one hooking portion and the other end is hooked to the other hooking portion, so that the spring can function to support a seated person (stretching Spring). For example, an S spring or a formed wire can be used.
[2] Configuration 2
A seat 2 having a front frame 21 at the front end;
A cushion spring 5 having one end hooked to the front hooking portion 12 of the seat front end portion and the other end hooked to the rear hooking portion 32 of the rear end position of the seat portion 2;
A distance adjusting mechanism for changing a distance between a latching position by the front latching part 12 and a latching position by the rear latching part 32;
A seat characterized by having.
For example, the distance adjusting mechanism is a mechanism that changes the distance by shifting the latching position by the rear latching portion 32 in conjunction with the operation of a lever linked to the rear latching portion 32.

[3] Configuration 3
In Configuration 1 or Configuration 2,
The distance adjustment mechanism changes the distance to be shortened when tilted in a direction in which the angle formed by the back frame 4 and the seat portion 2 increases.
A seat characterized by that.
The direction in which the angle formed between the back frame 4 and the seat portion 2 is the direction in which the back frame 4 is tilted backward.
[4] Configuration 4
In Configuration 1 or Configuration 2,
The distance adjustment mechanism changes the distance to be longer when tilted in a direction in which the angle formed by the back frame 4 and the seat portion 2 increases.
A seat characterized by that.
[5] Configuration 5
In configuration 1,
The back frame 4 has a hanging part 411 (431) extending downward from the rotation center of tilting,
The rear hooking portion 32 includes a link member 321 and a bracket 323 provided with a hooking portion 325 for the spring 5, and the link member 321 has one end portion with respect to the hanging portion 411 (431). The intermediate portion 321c is rotatably supported by the seat rear frame 23 at the rear end portion of the seat portion 2, and the bracket 323 is integrally fixed to the other end portion of the link member 321. ,
The distance adjusting mechanism includes the hanging part 411 (431) and the rear hooking part 32.
A seat characterized by that.
That is, in the configuration 5, the distance adjusting mechanism includes the hanging part 411 (431) that can be swung, and the link member 321, the bracket 323, and the latching part 325 that are interlocked with the swinging of the hanging part 411 (431). And a rear latch 32.

[6] Configuration 6
In any of Configuration 1 to Configuration 5,
The distance adjusting mechanism changes the distance by shifting the latching position by the rear latching portion 32.
A seat characterized by that.

The configuration 1 includes a seat portion 2 having a seat front frame 21 at a front end, a back frame 4 provided so as to be tiltable with respect to the seat portion 2, and a front hook provided on the seat front frame 21. A cushion spring 5 having one end hooked to the stopper 12 and the other end hooked to the rear hook 32 provided at the lower end of the back frame 4 and the hook by the front hook 12 Since the seat has a distance adjustment mechanism that changes the distance between the position and the latching position by the rear latching portion 32 in conjunction with the tilt of the back frame 4, the spring is interlocked with the tilt of the back frame 4. The cushioning property can be adjusted by shortening (= soft) 5 or lengthening (= hard) 5. By appropriately setting this adjustment amount, it is possible to give a good seating feeling to the seated person.
Configuration 2 includes a seat 2 having a seat front frame 21 at the front end, and a front latch 12 at the front end of the seat, one end of which is behind the position of the rear end of the seat 2. A cushion spring 5 having the other end hooked on the hook 32, and a distance adjusting mechanism for changing the distance between the hook position by the front hook 12 and the hook position by the rear hook 32. Since it is a seat having, for example, the cushioning property can be adjusted by shortening (= soft) or lengthening (= hard) the cushion spring 5 in conjunction with the operation of the lever. By appropriately setting this adjustment amount, it is possible to give a good seating feeling to the seated person.

Configuration 3 is Configuration 1 or Configuration 2, wherein the distance adjusting mechanism is tilted in a direction in which an angle formed by the back frame 4 and the seat portion 2 is expanded (= a direction in which the back frame 4 is tilted backward). Since the seat is changed so as to shorten the distance, the spring 5 can be softened in conjunction with the backward tilting of the back frame 4. If the back part falls back, the seat direction component of the seated person's weight becomes smaller and lighter, but the spring cushioning becomes softer in conjunction with the reclining operation, so the amount of sinking is the same as during uprights. It can be secured. For this reason, it is possible to prevent the seating feeling from deteriorating like a forward shift.
Configuration 4 is Configuration 1 or Configuration 2, wherein the distance adjusting mechanism is tilted in a direction in which an angle formed by the back frame 4 and the seat portion 2 increases (= a direction in which the back frame 4 is tilted backward). Since the seat is changed so as to increase the distance, the cushion spring 5 can be hardened in conjunction with the backward tilting of the back frame 4 (= reclining operation) to increase the repulsive force. Since the end of the cushion spring 5 is latched by the front latching portion 12 and the rear latching portion 32, the weight of the seated person who is applied to the cushion spring 5 is the latching position of the latching portions 12 and 32. It works to prevent the transition. For this reason, when the back frame 4 is to be returned to the original upright state, an extra force corresponding to the weight of the seated person is required, but in the configuration 4, the repulsive force of the cushion spring 5 is strengthened. Therefore, there is an effect that the extra force is sufficient. For this reason, for example, in the mechanism that assists the return to the upright state using the gas damper, it is not necessary to excessively increase the force of the gas damper, and thereby the reclining operation can be performed well. .
Configuration 5 is that in Configuration 1, the back frame 4 has a hanging portion 411 (431) extending downward from the center of rotation of the tilt, and the rear hooking portion 32 includes the link member 321 and the A bracket 323 provided with a latching portion 325 for the spring 5, and one end portion of the link member 321 is movably connected to the hanging portion 411 (431) and the seat at the intermediate portion 321c. The bracket 323 is integrally fixed to the other end of the link member 321, and the distance adjusting mechanism includes the hanging part 411 (431). And the rear latch portion 32, the back frame 4 can be easily detached from the seat portion 2 and the maintainability is good. That is, it is only necessary to remove the hanging part 411 (431) of the back frame 4 from the link member 321 of the rear hooking part 32, and it is not necessary to remove the cushion spring 5, so that it can be easily removed.
Configuration 6 is any one of Configurations 1 to 5, in which the distance adjustment mechanism is a seat that changes the distance by changing the latching position of the rear latching portion 32. It does not affect the outer shape of the front part, and does not cause a sense of incongruity on the back of the knee.

The perspective view which shows the internal structure of the seat of embodiment. The perspective view which shows the decomposition | disassembly state of the internal structure of the seat of FIG. The right view which shows the state before and behind reclining of the internal structure of the seat of FIG. The left and right are based on the occupant standards, and the same applies throughout this specification. The rear view of the internal structure of the seat of FIG. The right side view (a) which shows the reclining state of the internal structure of the seat of FIG. 1, and the right side view (b) which shows an upright state.

  A seat according to an embodiment of the present invention will be described with reference to the drawings. Hereinafter, terms such as front / rear / left / right are based on the seated person. The illustrated seat includes a seat portion 2 and a back frame 4 erected from the rear end side of the seat portion 2. A surface layer member such as a cushion is mounted on the seat portion 2 and a similar surface layer member is mounted on the back frame 4, but illustration and description thereof are omitted.

The seat 2 has a seat front frame 21 provided at the front end and a seat rear frame 23 provided at the rear end. Although not shown, the seat left frame connecting the left end of the seat front frame 21 and the left end of the seat rear frame 23, and the right end of the seat front frame 21 and the right end of the seat rear frame 23 are shown. These four frames constitute a structure of the seat portion 2 that is substantially square when viewed from above.
The seat portion 2 is integrally attached to a pedestal (not shown) that is fixed to the floor surface of the vehicle on which the seat of the embodiment is mounted.

The pipe-like seat front frame 21 extending in the width direction is integrally provided with a bracket 12 as a front latching portion so as to extend obliquely forward and upward. A hooking portion 125 for hooking the front end portion of the S spring 5 is integrally provided in the vicinity of the upper edge portion of the rear surface of the bracket 12. In the example shown in the figure, three hooking portions 125 are provided at equal intervals, but this number may be changed as appropriate according to the number of S springs 5 to be installed.
A bracket 216 for connecting the rod 61 of the gas spring 6 is integrally provided on the rear surface near the right end of the seat front frame 21.
On the other hand, the pipe-shaped seat rear frame 23 extending in the width direction is integrally provided with brackets 233 for rotatably supporting the vicinity of an intermediate portion 321c of a link member 321 described later on upper surfaces near both left and right ends thereof. Is provided.

  The back frame 4 includes a long plate-like back right frame 41, a long plate-like back upper frame 45 that is bent from the upper end of the back right frame 41 and bent in a right angle direction, and a long plate shape. The back left frame 43 and a pipe-like back lower frame 47 provided so as to connect the inner surface near the lower end of the back right frame 41 and the inner surface near the lower end of the back left frame 43. When viewed from the front, it forms a substantially square shape. Further, on the rear side of the back frame 4, plate members (in the illustrated example, two upper and lower plate members) for supporting the back of the seated person are integrally provided.

From the lower end of the back left frame 43, a hanging part 431 integrated with the back left frame 43 is suspended. The hanging portion 431 is curved so as to protrude forward, and a through hole for receiving the pin 70 is formed in the vicinity of the upper end portion thereof.
Similarly, a hanging part 411 integrated with the back right frame 41 is also suspended from the lower end of the back right frame 41. The hanging portion 411 is also curved so as to protrude forward, and a hanging extending portion 412 to which the bracket 624 at the tip of the cylinder 62 of the gas spring 6 is connected is extended from the lower end thereof. A through hole for receiving the pin 70 is also formed in the vicinity of the upper end portion of the hanging portion 411.

  The back frame 4 has the pin 70 inserted through the through hole of the hanging part 411, and the pin 70 is inserted into the through hole of the hanging part 431, so that the pin 70 serves as the rotation axis 4C. A pedestal (not shown; fixed to the floor of the vehicle on which the seat of the embodiment is mounted as described above) is rotatably supported via a bracket (not shown). That is, it is supported by a pedestal (not shown) so that the pin 70 can be tilted about the rotation center.

The upper end of the link member 321 is connected to the lower end of the hanging part 411 of the back right frame 41 through the pin 72 with play. That is, the pin 72 inserted so as to be movable in the long hole 321a at the upper end portion of the link member 321 is also inserted into the through hole near the lower end portion of the hanging portion 411, whereby both are movable with play. Connected in state.
Similarly, the upper end of the link member 321 is connected to the lower end of the hanging part 431 of the back left frame 43 through the pin 72 with play. That is, the pin 72 inserted so as to be movable in the long hole 321a at the upper end portion of the link member 321 is also inserted into the through hole near the lower end portion of the hanging portion 431, whereby both of them are movable with play. Connected in state.

  The left and right link members 321 are rotatably supported by the bracket 233 via pins 74 in the vicinity of the intermediate portion 321c. As described above, the left and right brackets 233 are integrally fixed to the upper surface side of the seat rear frame 23. For this reason, the left and right link members 321 are rotatably supported at upper positions near both ends of the seat rear frame 23. The right bracket 233 is provided at a position slightly closer to the center, but this is to make room for the gas spring 6 to be disposed.

  The left and right link members 321 are integrally connected via brackets 323 in the vicinity of the lower ends thereof. That is, the end portions of the long bracket 323 having a U-shaped cross section are integrally joined to the inner surface side (opposite surface side) of the left and right link members 321 by welding. For this reason, when the link member 321 rotatably supported as described above rotates around the pin 72 as the axis, the bracket 323 integrated with the link member 321 also rotates in the same manner. Thereby, the swing of the bracket 323 is realized.

  A hooking portion 325 for hooking the rear end portion of the S spring 5 is integrally provided on the front edge of the bracket 323. In the example shown in the figure, the three hooking portions 325 are provided at equal intervals, but this number may be appropriately changed according to the number of S springs 5 to be installed. In addition, the latching | locking part 325 shown by the dotted line in FIG. 2 shows the approximate position where the latching part 325 is distribute | arranged when the bracket 323 is assembled | attached like FIG.

  As a result, the S spring 5 is hooked at the hooking portion 125 at the front end and is hooked at the hooking portion 325 at the rear end. Here, the position of the latching portion 125 is fixed, but the position of the latching portion 325 changes with the swing of the bracket 323 (= rotation of the link member 321). For this reason, the distance between the latching portion 125 and the latching portion 325 also changes with the swing of the bracket 323 (= rotation of the link member 321).

  The rotation of the left and right link members 321 occurs in conjunction with the transition of the lower end portions of the hanging portions 411 and 431 that are movably connected to each upper end portion with play. That is, the back right frame 41 and the back left frame 43 are rotated by using the pin 70 as the axis of rotation, in other words, with the tilting of the back frame 4 (reclining operation, returning operation from reclining). Is born.

  In this way, the change of the latching portion 325 that latches the rear end portion of the S spring 5 is caused in conjunction with the tilting of the back frame 4 (reclining operation, returning operation from reclining). The distance between the portion 125 and the hooking portion 325 changes. Further, due to this change in distance, the length of the S spring 5 changes, and its tension also changes. For example, when the length of the S spring 5 is shortened, the tension of the S spring 5 is reduced and becomes soft. Further, when the length of the S spring 5 becomes longer, the tension of the S spring 5 increases and becomes harder.

  Further, as shown in the figure, the hanging portions 411 and 431 of the back right frame 41 and the back left frame 43 are curved so as to protrude forward, and the upper ends are connected with play at their lower ends. Each link member 321 is curved so as to protrude rearward. Each link member 321 is rotatably supported in the vicinity of each intermediate portion 321c. For this reason, when the back frame 4 tilts backward (= reclining operation) and the hanging parts 411 and 431 swing upward and forward, the lower ends of the link members 321 swing downward and backward. As described above, the bracket 323 is integrally fixed to the lower ends of the left and right link members 321. For this reason, the bracket 323 also swings downward / rearward, whereby the latching portion 325 provided integrally with the bracket 323 is also shifted downward / rearward.

  For this reason, in conjunction with the backward tilting of the back frame 4 (= reclining operation), the S spring 5 sinks on the rear end side without changing the latching position on the front end side. When the seated person falls back by the reclining operation, the butt sinks downward. For this reason, when only the back falls backward, the back misalignment feeling that the back deviates from the back of the seat is suppressed, and a good seating feeling is obtained.

  When the distance between the latching portion 125 and the latching portion 325 is changed in conjunction with the tilting of the back frame 4 (= reclining operation), whether the distance is changed to be shorter or longer is changed. It can be adjusted by appropriately setting the shape of the hanging parts 411 and 431, the shape of the link member 321, the position where the bracket 323 is attached to the link member 321 and the position where the hooking part 325 is attached to the bracket 323.

  When the distance between the latching portion 125 and the latching portion 325 is changed short in conjunction with the tilting of the back frame 4 (= reclining operation), the tension of the S spring 5 is reduced and softened, and the repulsive force becomes weak. If the back frame 4 falls backward, the seat direction component of the seated person's weight becomes smaller and lighter. However, if the cushioning of the S spring is set to soften in conjunction with the reclining operation, it will increase. Since the amount of subsidence equivalent to that at the time of writing can be secured, it is possible to prevent the seating feeling from deteriorating like a forward shift.

  On the other hand, when the distance between the latching portion 125 and the latching portion 325 is changed to be long in conjunction with the tilting of the back frame 4 (= reclining operation), the tension of the S spring 5 increases and becomes harder, and the repulsive force becomes stronger. Since the rear end portion of the S spring 5 is hooked on the rear hook portion 32, the weight of the seated person who is applied to the S spring 5 acts so as to prevent the change of the hook position of the rear hook portion 32. doing. For this reason, when trying to return the back frame 4 to the original upright state, an extra force corresponding to the weight of the seated person is required, but since the repulsive force of the S spring 5 is strengthened, That extra power is enough. In the seat according to the present embodiment, a mechanism that assists the return to the upright state using the gas spring 6 is employed, but between the latching portion 125 and the latching portion 325 in conjunction with the reclining operation. When the distance is set to be long, it is not necessary to increase the force of the gas spring 6 excessively. Moreover, since the thing of normal capability can be employ | adopted as the gas spring 6, it is not necessary to tilt down the back frame 4 with an excessively big force at the time of a reclining operation | movement, and even a weak person, such as a child, can fully operate.

  In the seat according to the present embodiment, the hanging part 411 of the back part right frame 41 and the hanging part 431 of the back part left frame 43 are connected to the bracket 323 and the hooking part 325 via the link member 321, respectively. For this reason, when the back frame 4 is removed, it is sufficient to release the connection between the left and right hanging parts 411 and 431 and the left and right link members 321, and it is not necessary to remove the S spring 5. For this reason, maintenance is easy.

  In the seat of the above-described embodiment, the back frame 4 is connected to the bottom hanging portions 411 and 431 at the left and right lower ends of the back frame 4 and the rear latching portions 32 (link members 321, The bracket 323 and the latching portion 325) are connected to the S spring 5 and its latching position is changed. As a mechanism for changing the latching position of the S spring 5, other than the above, Is also possible. For example, instead of the left and right back frames 41, 43, a back frame having a portion extending forwardly in an L shape from the lower end portion is used, and the vicinity of the front end portion of the extending portion is rotatably supported. In addition, the same effect can be achieved with a configuration in which a latching portion for latching the rear end of the S spring 5 is provided near the base of the L-shape.

  Further, in the seat of the embodiment, the distance between the latching portion 125 and the latching portion 325 is changed in conjunction with the backward tilting (= reclining operation) of the back frame 4. For example, the distance between the latching portion 125 and the latching portion 325 can be changed in conjunction with a predetermined lever operation. For example, a mechanism that swings the rear latching portion 32 (link member 321, bracket 323, latching portion 325) in conjunction with a predetermined lever operation can be exemplified.

In the seat of the above embodiment, a train seat is assumed, but the present invention is not limited to a train seat, and a seat of a vehicle such as an ordinary car, a bus, a ship, an airplane, or the like. It can be similarly applied to theater seats and the like.
In addition, although the S spring is used in the above embodiment, a so-called formed wire (a spring in which the R-shaped curved portion of the S spring is a corner) is used instead of or together with the S spring. It can also be used. In short, any spring can be used as long as one end and the other end are stretched by being hooked on the respective hooks, thereby providing a function of supporting the seated person.

12 Front latch (bracket)
125 latching part 2 (for S spring front end) seat 21 seat front frame 216 bracket 23 seat rear frame 233 bracket 32 (for supporting link member) rear latching part 321 link member 321a (link member 321) Long hole 321c (at the upper end) Intermediate portion 323 (of link member 321) Bracket (swing member)
325 Hook 4 (for the rear end of the S spring) Back frame 41 Back right frame 411 Dropped portion 412 (back right frame) Dropped extension 43 Back left frame 431 Dropped portion 45 (back left frame) Down top Frame 47 Back lower frame 4C Rotation center (tilt center) of back frame 4
5 S spring 6 Gas spring 61 Rod 62 Cylinder 624 Bracket 70 Pin 72 Pin 74 Pin 76 Pin

Claims (6)

A seat with a front frame at the front end;
A back frame provided to be tiltable with respect to the seat;
A cushion spring having one end hooked on the front hooking portion provided on the seat front frame and the other end hooked on the rear hooking portion provided on the lower end portion of the back frame;
A distance adjusting mechanism for changing the distance between the latching position by the front latching part and the latching position by the rear latching part in conjunction with the tilt of the back frame;
A seat characterized by having. A seat with a front frame at the front end;
A cushion spring having one end hooked to the front hooking portion of the seat front end portion and the other end hooked to the rear hooking portion of the rear end position of the seat;
A distance adjusting mechanism for changing a distance between a hooking position by the front hooking part and a hooking position by the rear hooking part;
A seat characterized by having. In claim 1 or claim 2,
The distance adjusting mechanism changes the distance to be shortened when tilted in a direction in which an angle formed by the seat and the back frame is widened.
A seat characterized by that. In claim 1 or claim 2,
The distance adjusting mechanism changes the distance so that the distance becomes longer when tilted in a direction in which an angle formed by the seat and the back frame is widened.
A seat characterized by that. In claim 1,
The back frame has a hanging portion that extends downward from the center of rotation of the tilt,
The rear latching portion includes a link member and a bracket provided with the latching portion for the spring, and the link member has one end portion movably connected to the hanging portion and an intermediate portion. Supported by a rear frame of the seat at the rear end of the seat, and the bracket is integrally fixed to the other end of the link member,
The distance adjustment mechanism is configured by the hanging part and the rear hooking part.
A seat characterized by that. In any one of Claims 1-5,
The distance adjustment mechanism changes the distance by shifting the latch position by the rear latch portion.
A seat characterized by that.

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