JP5339344B2 - Chair with reclining mechanism - Google Patents

Description

  The present invention relates to a chair with a reclining mechanism in which a seat portion is displaced in accordance with tilting of a backrest.

  The conventional chair with a reclining mechanism is configured so that the seat moves backward in conjunction with the movement of tilting the backrest, or the rear end side of the seat descends and tilts while moving backward There is. (For example, refer to Patent Document 1). By interlocking in this way, the displacement between the seated person and the backrest and the seat is reduced before and after the reclining.

  The chair disclosed in Patent Document 1 is installed in an automobile or the like, and a base plate is placed on a vehicle body, an arm is pivotally supported on the base plate, and a backrest (seat back) is fixed to the arm. At the same time, one end of the interlocking plate is pivotally mounted, the other end of the interlocking plate is fixed to the rear of the seat (seat cushion), and the front of the seat is front and rear to the bracket placed on the vehicle body. The base plate is provided with a lock mechanism that supports the arm so as to be movable in the direction and adjusts the arm to a desired inclination angle.

JP-A-8-214977

  Since the chair disclosed in Patent Document 1 has a lower center of rotation of the backrest than the seat, the length from the center of rotation to the upper end of the backrest is long, and the amount of protrusion of the backrest to the rear when tilted later increases. There is a problem that the rear seat space becomes narrow.

  As a method of reducing the back protrusion amount of the backrest, there is a method of increasing the rotation center of the backrest. For example, some railcar vehicle seats are structured so that the seats can be rotated face-to-face, and if they are face-to-face, they will be back-to-back with the next seat, making it difficult to collapse the backrest. The center of rotation of the backrest is raised to reduce the amount of back protrusion of the backrest during reclining.

  However, if the center of rotation of the backrest is made higher than the seat portion, when the backrest is tilted, the lower portion of the backrest (the portion below the rotation center) moves forward, so in the mechanism as disclosed in Patent Document 1, The seat cannot be displaced backward in conjunction with the action of tilting the backrest backward.

  The present invention is intended to solve the above-described problem, and provides a chair with a reclining mechanism in which a seat portion is displaced rearward in conjunction with the backrest of the backrest while suppressing the amount of rearward protrusion of the backrest during reclining. The purpose is to do.

  The gist of the present invention for achieving the object lies in the inventions of the following items.

[1] a seat,
A support part that supports the seat part so as to be displaceable back and forth; and
A reclining backrest having a center of rotation above the seat;
By reversing the movement of the backrest in the front-rear direction below the center of rotation and transmitting it to the seat portion, when the backrest reclines backward, the seat portion is displaced rearward and when the backrest occurs, the seat portion An interlocking part that interlocks the backrest and the seat part so as to be displaced forward;
I have a,
When the support portion is displaced rearward, the seat portion is displaced so that the rear end is lowered and the front end is raised,
A chair with a reclining mechanism , wherein the amount of rearward movement of the seat when the backrest is reclined rearward is greater than the amount of vertical movement at each of the front and rear ends of the seat.

  In the said invention, the back protrusion amount of the backrest at the time of reclining becomes small by making the rotation center of a backrest higher than a seat part. In addition, the interlocking portion reverses the movement of the backrest in the front-rear direction below the center of rotation and transmits it to the seat, so when the reclining back is reclined, the seat is displaced backward, and when the backrest is raised, the seat is The backrest and the seat are interlocked so as to be displaced forward.

  In the above invention, the seat portion is inclined in the direction in which the rear end is lowered when the seat portion is displaced rearward along with the reclining of the backrest. This inclination is realized, for example, by lowering the rear end side when moving backward, or by raising the front end side, or by lowering the rear end side and raising the front end side.

[ 2 ] The support portion includes a pair of a roller whose axial direction is the width direction of the seat portion and a contact block that is in contact with the roller, one of which is provided on the back surface of the seat portion, and the other is Those provided on the base part below the seat part, respectively on the front end side and the rear end side of the seat part,
The chair with a reclining mechanism according to [1] , wherein a surface of the contact block that contacts the roller is inclined downward from a center side in the front-rear direction of the seat portion.

  In the above-mentioned invention, the front and rear displacements and the upper and lower displacements are realized simultaneously by moving the inclined contact surface of the contact block on the roller.

[ 3 ] The inclined surface of the contact block is a curved surface along a circumference of a predetermined circle having a center below the seat portion and having a diameter direction in the front-rear direction of the seat portion. The chair with a reclining mechanism according to [ 2 ].

In the said invention, a seat part is displaced smoothly with little resistance by being along a periphery.
[4] The diameter of the circle is longer than the distance between the roller on the front end side and the roller on the rear end side of the seat portion.
The chair with a reclining mechanism according to [3].

[ 5 ] The interlocking portion has a first end connected to the backrest below the rotation center, a second end connected to the seat, and a gap between the first end and the second end. The predetermined portion of the chair has a link member pivotally supported by the base portion. The chair with a reclining mechanism according to any one of [1] to [ 4 ].

  In the above invention, the movement of the lower backrest can be reversed and transmitted to the seat with a simple configuration.

  ADVANTAGE OF THE INVENTION According to this invention, the chair with a reclining mechanism in which a seat part is displaced back interlocked with the back fall of a backrest is suppressed, suppressing the protrusion amount of the backrest at the time of reclining small.

  Hereinafter, various embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic structure of a chair 10 with a reclining mechanism according to an embodiment of the present invention, and shows the chair 10 with a reclining mechanism in a state where the backrest is raised (upright posture). FIG. 2 shows a state where the backrest is reclined (tilted backward). FIG. 3 is a perspective view showing a main part of the chair 10 with the reclining mechanism in a state where the cushion is removed.

  The chair 10 with a reclining mechanism is configured as a two-seat seat installed in a railway vehicle. A chair 10 with a reclining mechanism includes a leg portion 11 installed on the floor surface, a frame portion 12 pivotally supported on the leg portion 11 so as to be horizontally rotatable with the floor surface, and a seat portion 13 on which a person sits. And a support part 14 that supports the seat part 13 so as to be displaceable back and forth with respect to the frame part 12, and a rotation center (rotary shaft 21) above the seat part 13 on the rear end side of the seat part 13. The reclining back 15 and the back and forth movement of the back 15 below the center of rotation (rotating shaft 21) are reversed and transmitted to the seat 13, so that when the back 15 reclines back, the seat 13 moves backward. When the backrest 15 is displaced and the backrest 15 is raised, the backrest 15 and the seat portion 13 are coupled and interlocked so that the seat portion 13 is displaced forward.

  The frame portion 12 is locked at either the position shown in FIG. 1 (position facing the traveling direction of the vehicle) with respect to the leg portion 11 or a position rotated 180 degrees relative to this position. It is released by stepping on.

  As shown in FIG. 3, the underframe portion 12 includes two support beams 12a arranged in parallel in the front-rear direction, a side plate 12b connecting these at both left and right ends, and two support beams 12a at the center. A shaft portion 12 c is provided so as to be connected and inserted into a bearing (not shown) provided in the center of the leg portion 11.

  In addition, support arms 12 d that support both ends of the rotation shaft 21 of the backrest 15 are provided upright on the support beam 12 a (B) on the rear side. In FIG. 3, a support arm for supporting the rotary shaft 21 on the front side is not shown. Further, the symbol (F) attached to the end of each symbol indicates the front end side, and (B) indicates the rear end side.

  The seat portion 13 includes a seat frame 13a having a rectangular frame, a plurality of wave springs 13b spanning between left and right frame members of the seat frame 13a and supporting the seat surface from the back side, and the entire seat frame 13a. A seat cushion 13c (see FIG. 1) covering from above is provided.

  As shown in FIGS. 1 and 2, the support portion 14 that supports the seat portion 13 so as to be displaceable back and forth on the frame portion 12 includes a roller 14 a having the axial direction in the width direction of the seat portion 13 and the roller 14 a. A pair of contact blocks 14b that are in contact with each other are arranged in pairs on the left and right on the front end side of the seat portion 13 and on the left and right on the rear end side of the seat portion 13 respectively. Here, a contact block 14b is provided on the back surface of the seat portion 13 (seat frame 13a), and the roller 14a is rotatably attached to a corresponding position of the frame portion 12.

  More specifically, the abutment blocks 14b (F) are respectively attached to the left and right sides of the back surface of the frame portion on the front end side of the seat frame 13a, and the abutment blocks 14b (B) on the left and right sides of the back surface of the frame portion on the rear end side of the seat frame 13a. ) Is attached.

  The rollers 14a (F) provided corresponding to the contact blocks 14b (F) provided on the left and right of the front end side of the seat portion 13 project forward to the support beam 12a (F) on the front side of the frame portion 12. It is pivotally supported on a mounting plate 23 fixed to the base plate. Further, the rollers 14a (B) provided corresponding to the contact blocks 14b (B) provided on the left and right of the rear end side of the seat portion 13 are in front of the support beam 12a (B) on the rear side of the frame portion 12. It is pivotally supported by a mounting plate 23 that is fixed so as to protrude to the rear.

  The surface (contact surface) that contacts the roller 14a of each contact block 14b is inclined downward from the center side in the front-rear direction of the seat portion 13 toward the outside. Here, the downwardly inclined contact surface has a curved surface along the circumference of a circle having a center below the seat portion 13 and having the front-rear direction of the seat portion 13 as the diameter direction.

  FIG. 4 shows a simplified movement of the seat 13 supported by the support 14. In FIG. 4, only the seat frame 13a of the seat portion 13, the front and rear contact blocks 14b (F) and (B) attached to the back surface thereof, and the corresponding rollers 14a (F) and (B) are shown. It is.

  The contact block 14b on the back surface of the seat 13 (seat frame 13a) is placed on the corresponding roller 14a. When in the position indicated by the solid line in the figure, the seat 13 (seat frame 13a) is in a substantially horizontal state with respect to the floor surface (or in a state of being slightly inclined downward from the front end to the rear end). When the seat 13 (seat frame 13a) is displaced rearward while maintaining the contact surface (lower surface) of the contact block 14b in contact with the circumferential surface of the roller 14a, as shown by the dashed line in the figure, The rear end side of the portion 13 (seat frame 13a) descends with backward displacement, and the front end side of the seat portion 13 (seat frame 13a) rises with backward displacement.

  More specifically, both the contact surface of the front contact block 14b (F) and the contact surface of the rear contact block 14b (B) are centered below the seat portion 13 (seat frame 13a). A curved surface is formed along the circumference of a virtual circle M having a diameter, and the circumferential surface of the roller 14 a is disposed so as to contact the inside of the virtual circle M. Each contact block 14b provided on the back surface of the seat portion 13 (seat frame 13a) is displaced along the circumference of the virtual circle M. As a result, when the seat 13 (seat frame 13a) is displaced rearward from the position substantially above the circle M along the circumference of the circle M, the seat 13 is inclined so that the rear end side is lowered and the front end side is raised. However, if it returns to a position just above the virtual circle M, the movement returns to a substantially horizontal posture.

  Next, the structure of the interlocking | linkage part 16 is demonstrated based on FIG.

  The interlocking portion 16 has a first end portion 31 connected to the back frame 15a of the backrest 15 below the rotation center (rotary shaft 21) of the backrest 15 and a second end portion on the rear end side portion of the seat frame 13a of the seat portion 13. The end portion 32 is connected, and a second support arm 12e is erected from a rear end portion of the frame portion 12 at a predetermined position (substantially the center in this example) between the first end portion 31 and the second end portion 32. The link member 30 is rotatably supported at the front end portion of the shaft via a shaft 33.

  More specifically, a curved arm 24 that is curved so as to swell forward and extends downward is provided at the lower portion of the back frame 15a, and the base end side of the curved arm 24 is a rotating shaft 21 and the support arm 12d. It is pivotally supported at the tip. A first pin 25 is attached to the curved arm 24 at a position slightly lower than the middle thereof in parallel with the rotary shaft 21. The first end 31 of the link member 30 is provided with a first long hole 31 a that is engaged with the first pin 25. In addition, a second pin 26 is erected on the rear end side portion of the seat frame 13 a of the seat portion 13 in parallel with the rotary shaft 21, and the second end portion 32 of the link member 30 is connected to the second pin 26. A second elongated hole 32a to be engaged is provided.

  The first elongate hole 31a, the second elongate hole 32a, and the shaft 33 are arranged on a straight line, and the first elongate hole 31a and the second elongate hole 32a are formed so that the longitudinal direction thereof is oriented along the straight line. ing.

  When the backrest 15 reclines, the curved arm 24 rotates in the direction of the arrow J1 in the drawing around the rotation shaft 21, and the first pin 25 below the rotation shaft 21 advances forward. The link member 30 having the first elongated hole 31a engaged with the first pin 25 is configured such that when the first pin 25 advances forward, the first end 31 side having the first elongated hole 31a moves forward. The second end 32 on the opposite side is moved backward (in the direction of arrow J3). With this movement, the seat frame 13a of the seat portion 13 having the second pin 26 engaged (inserted) in the second elongated hole 32a of the second end portion 32 is displaced rearward.

  When the seat portion 13 (seat frame 13a) is displaced rearward in conjunction with the reclining of the backrest 15, the rear end side of the seat portion 13 (seat frame 13a) is lowered and the front end side is lowered as shown in FIG. Tilt to rise.

  When the backrest 15 is raised from the reclining posture to the upright posture, the curved arm 24 rotates in the direction of the arrow K1 around the rotation shaft 21, and the first pin 25 below the rotation shaft 21 moves backward (in the direction of the arrow K2). Go back to). The link member 30 having the first elongated hole 31a engaged with the first pin 25 is configured such that when the first pin 25 is moved backward, the first end 31 side where the first elongated hole 31a is located moves backward. The second end portion 32 on the opposite side moves forward (in the direction of arrow K3). With this movement, the seat frame 13a of the seat portion 13 having the second pin 26 engaged (inserted) in the second elongated hole 32a of the second end portion 32 is displaced forward.

  When the seat portion 13 (seat frame 13a) is displaced forward in conjunction with the return of the backrest 15 to the upright posture, the rear end side of the seat portion 13 (seat frame 13a) is moved as shown in FIG. Ascends, and the front end side descends and is displaced so as to return to the horizontal (position indicated by the solid line in FIG. 4).

  At this time, since the weight of the seated person is added in the direction of descending to the front end of the seat portion 13, a force for moving the seat portion 13 forward is assisted. That is, the seat portion 13 is displaced along the circumference of the virtual circle M as shown in FIG. Therefore, the downward force due to the weight of the seated person applied to the front end of the seat portion 13 at the position shown by the one-dot broken line in FIG. 4 inclined so that the front end side rises is applied to the seat portion 13 along the virtual circle M in FIG. It acts as a force to move to the position indicated by the solid line, and the forward movement is assisted.

  As described above, in the chair 10 with the reclining mechanism according to the present embodiment, the movement of the backrest 15 in the front-rear direction below the rotation center (rotary shaft 21) of the backrest 15 is reversed by the link member 30 of the interlocking portion 16. This is transmitted to the seat 13. As a result, even when the center of rotation of the backrest 15 is higher than the seat portion 13, the seat portion 13 is displaced rearward when the backrest 15 reclines back, causing the backrest to occur. At this time, the seat portion 13 can be interlocked so as to be displaced forward.

  In addition, the seat 13 slides backward in conjunction with the reclining of the backrest 15 and the seating surface is tilted (tilted) in the direction in which the rear end is lowered, so that the seated person is lifted up and down without feeling uncomfortable before and after the reclining. It is possible to provide a comfortable sitting comfort without having to sit back and forth.

  The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within the scope of the present invention. Are also included in the present invention.

  The interlocking unit 16 is not limited to the configuration shown in the embodiment. For example, the lower end of the back frame 15a extends further below the seat 13 (seat frame 13a), the first end 31 of the link member 30 is connected to the lower end, and the second end 32 is connected to the seat 13 (seat frame). 13a) It is good also as a structure connected with the rear-end part, and the axis | shaft 33 being pivotally supported by the frame part 12 between the 1st end part 31 and the 2nd end part 32. FIG.

  The interlocking unit 16 may be an arbitrary mechanism as long as it is a mechanism that reverses the movement of the backrest 15 in the front-rear direction below the rotation center (the rotation shaft 21). For example, it may be reversed using a gear.

  The structure of the support portion 14 is not limited to that shown in the embodiment, and for example, the seat portion 13 may be supported by a combination of links so that the inclination of the seat portion 13 can be displaced back and forth or front and back.

  In the embodiment, the abutment surfaces of both the abutment block 14b (F) on the front end side and the abutment block 14b (B) on the rear end side are inclined. The inclination may be given only to the abutting surface of the abutting block 14b on the side desired to be. For example, when the seat 13 is displaced up and down only on the rear end side in accordance with the front-rear displacement, only the contact surface of the contact block 14 b (B) on the rear end side needs to be inclined. Moreover, if the front end and the rear end do not require vertical displacement, the contact surfaces of all the contact blocks 14b may be made horizontal.

  In the embodiment, the roller 14a is provided on the side of the frame portion 12 and the contact block 14b is provided on the back surface of the seat portion 13 (seat frame 13a). However, these arrangements may be reversed. That is, the roller 14a may be attached to the back side of the seat part 13 (seat frame 13a) and the contact block 14b may be attached to the frame part 12 side upside down so that the contact surface is up.

  Further, in the embodiment, the pair of the roller 14a and the contact block 14b of the support portion 14 is provided separately for the front end side and the rear end side of the seat portion 13, but the contact block 14b (F) on the front end side is provided. And the abutting block 14b (B) on the rear end side may be configured as an integral block.

  In addition, in the embodiment, the chair is configured as a two-seat chair for a railway vehicle. However, the chair may be an aircraft chair, a theater chair, a study chair, or the like, and the use of the chair is not limited.

It is a side view which shows schematic structure of the chair with a reclining mechanism concerning embodiment of this invention in the state which stood back. It is a side view which shows schematic structure of the chair with a reclining mechanism concerning embodiment of this invention in the state which made the backrest recline. It is a perspective view which shows the principal part of the chair with a reclining mechanism shown in FIG. It is explanatory drawing which shows the structure and effect | action of a support part. It is a side view which expands and shows an interlocking | linkage part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Chair with a reclining mechanism 11 ... Leg part 12 ... Base frame part 12a ... Support beam 12b ... Side plate 12c ... Bearing part 12d ... Support arm 12e ... Second support arm 13 ... Seat part 13a ... Seat frame 13b ... Wave spring 13c ... Seat cushion 14 ... Support part 14a ... Roller 14b ... Abutment block 15 ... Backrest 15a ... Back frame 16 ... Interlocking part 21 ... Rotating shaft 22 ... Operation pedal 23 ... Mounting plate 24 ... Curved arm 25 ... First pin 26 ... First 2 pins 30 ... link member 31 ... first end 31a ... first slot 32 ... second end 32a ... second slot 33 ... axis M ... virtual circle

Claims (5)

A seat,
A support part that supports the seat part so as to be displaceable back and forth; and
A reclining backrest having a center of rotation above the seat;
By reversing the movement of the backrest in the front-rear direction below the center of rotation and transmitting it to the seat portion, when the backrest reclines backward, the seat portion is displaced rearward and when the backrest occurs, the seat portion An interlocking part that interlocks the backrest and the seat part so as to be displaced forward;
I have a,
When the support portion is displaced rearward, the seat portion is displaced so that the rear end is lowered and the front end is raised,
A chair with a reclining mechanism , wherein the amount of rearward movement of the seat when the backrest is reclined rearward is greater than the amount of vertical movement at each of the front and rear ends of the seat. The support portion has a pair of a roller having an axial direction that is the width direction of the seat portion and a contact block that is in contact with the roller, one of which is provided on the back surface of the seat portion, and the other is a seat portion. Those provided on the lower pedestal, respectively, on the front end side and rear end side of the seat,
The surface contacting with the roller abutment block, reclining mechanism chair according to claim 1, characterized in that it is inclined downward outward from the longitudinal center side of the seat portion. The inclined surface of the abutment block has a curved surface along a circumference of a predetermined circle having a center below the seat portion and having a front-rear direction of the seat portion as a diameter direction. Item 3. A chair with a reclining mechanism according to Item 2 .   The diameter of the circle is longer than the distance between the roller on the front end side and the roller on the rear end side of the seat portion.
  The chair with a reclining mechanism according to claim 3. The interlocking portion has a first end connected to the backrest below the rotation center, a second end connected to the seat, and a predetermined location between the first end and the second end. reclining mechanism chair according to but one of claims 1 to 4, characterized in that it has a pivoted link member to the base unit.

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