JP4933153B2 - Synchronous tilt mechanism - Google Patents

Description

  The present invention relates to a synchronous tilt mechanism. More specifically, the present invention relates to a synchronous tilt mechanism for a chair in which a seat and a backrest are tilted in conjunction with each other.

  In the present specification, the backrest side of each component member arranged as a component of the synchrony tilt mechanism of the chair is the rear, and the opposite side is the front.

  For example, as shown in FIG. 6, as a chair that tilts the seat and the backrest in conjunction with each other, the lower base 101 and the upper horizontal member 105 that are parallel to each other, and the front vertical member 106 that are parallel to each other, are used. And the rear longitudinal member 107 form parallel links 108, 108, and the parallel links 108, 108 form the frame 102 a of the back portion 102 so as to be able to tilt forward and backward, and attach the seat to the rear end of the seat 103. The portions 109 and 109 are provided in a rearwardly extending manner, the seat portion 103 is provided on the skeleton 102a of the back portion 102, the seat portion attaching portions 109 and 109 are pivotally attached thereto, and are provided on the front vertical member 106 and the rear vertical member 107. In addition, there is a structure in which the seat portion 103 is attached to be inclined forward and downward in a forward tilt state of the skeleton 102a via a forward rolling roller 110 and a rear rolling roller 111 that can be rolled up and down (Patent Document 1).

JP-A-8-317951

  However, in the chair of Patent Document 1, from the rearwardly tilted state (FIG. 6 (A)) to the forwardly tilted state (FIG. 6 (B)) of the skeleton 102a of the back portion 102, it is separated from the seat portion 103 by the height dimension H. The parallel link 108 must be rotated around the lower end of the front longitudinal member 106 at the position. Therefore, in order to shift from the backward inclined state to the forward inclined state, it is necessary to move the waist position of the seated person together with the seat portion 103 on an arc centering on the lower end portion of the front vertical member 106. In addition to taking a posture, the load on the legs of the seated person when moving the seat 103 is increased, and driving means for swinging the back 102 is required. Further, the height position of the seat portion 103 in the forward tilt state is lower than the height position of the seat portion 103 in the rear tilt state. Therefore, in addition to having to take an extreme forward leaning posture, the position of the seat portion 103 is lowered, so that, for example, when an operator works on a desk or a dentist performs treatment, the waist is slightly lowered from the sitting posture. When it is desired to maintain a light forward leaning posture by floating, there is a problem that the posture on the leg of the seated person cannot be reduced and the posture cannot be supported stably. Moreover, in the chair of patent document 1, the tilting mechanism is comprised as the whole chair, ie, the leg part and tilting mechanism of the chair are comprised integrally. For this reason, the tilting mechanism alone cannot be applied universally to chairs having various forms and configurations, and specifically, for example, a chair having a seat at the upper end of a commonly used pedestal. There is a problem that it cannot be used as a tilting mechanism.

  Therefore, the present invention reduces the burden on the seated person's feet when the seated person wants to maintain a light forward tilted position by slightly lifting his / her waist from the seated position, and stably by the seat and the backrest. An object of the present invention is to provide a tilting mechanism of a chair in which a seat capable of supporting a posture and a backrest are interlocked. Furthermore, as a tilting mechanism for the seat of the chair and the backrest, it has a structure independent of the legs, and there is a seat and backrest that can be applied universally without being restricted by the form of the legs or the overall configuration of the chair. It aims at providing the tilting mechanism of the chair which interlocks. In addition, the present invention provides a chair in which the back and the back are not hindered when the rear part of the pushed up seat is lowered to return the seat and the backrest to its original inclination, and the seat can be easily returned to the horizontal position. An object is to provide a tilting mechanism.

In order to achieve such an object, the synchrony tilt mechanism of the chair according to claim 1 is a main frame attached to the upper end of the pedestal and a seat plate of the seat, and the front part is swingable to the front part of the main frame. A seat plate support member connected to the main frame, a link member whose front part is swingably connected to the main frame, and a back support member that supports the backrest is fixed and the upper part swings to the rear part of the seat plate support member A backrest support member fixing portion that is freely connected and a lower portion is swingably connected to the rear portion of the link member, and is interposed between the main frame and the seat plate support member to push up the rear portion of the seat plate support member. A tilting power source that exerts a force, and when tilting the backrest in conjunction with the tilting of the seat, the tilting angle of the backrest is smaller than the tilting angle of the seat .

  Therefore, according to this synchronization tilt mechanism, when the backrest supported by the backrest support member is tilted in conjunction with the tilt of the seatplate support member that supports the seat plate of the seat, the tilt angle of the backrest is adjusted. It becomes smaller than the tilt angle. That is, when the back is tilted forward in conjunction with the rear part being pushed up and tilting the seat, the seat is tilted while the angle between the seat and the back is opened.

  Further, the seat plate support member is tilted by connecting the front portion of the main frame and the front portion of the seat plate support member in the vicinity of the back side of the knee of the seated person so that the seat plate swings. The seat can be tilted and the posture can be changed while the axis and the knee, which is the center of bending and stretching of the seated person's legs, are close to each other and both remain at a fixed position. Furthermore, since it has an independent structure as a tilting mechanism for the seat and the backrest, it can function independently as a tilting mechanism for the chair in which the seat and the backrest are interlocked.

According to a second aspect of the present invention, in the synchrony tilt mechanism of the chair according to the first aspect , the pivot connecting shaft center between the backrest support member fixing portion and the link member is movable in the axial direction of the link member. I am doing so. In this case, the swing connection shaft center between the upper portion of the backrest support member fixing portion and the seat plate support member is fixed, while the swing connection shaft between the lower portion of the backrest support member fixing portion and the link member. Since the core can move in the axial direction of the link member, the backrest support member fixing portion can be tilted independently regardless of the tilt of the seat plate support member, and thereby the spine is independent of the tilt of the seat. The drowning can be tilted alone.

According to the synchronous tilt mechanism of the chair according to claim 1, when the backrest supported by the backrest support member is tilted in conjunction with the tilt of the seatboard support member that supports the seat plate of the seat, Since the tilt angle is smaller than the tilt angle of the seat and the angle between the seat and the backrest is tilted, it tilts while the back is pushed up, and the backrest is more than the natural forward leaning posture of the seated person when the seat tilts. By tilting forward and pushing the back, the seated person can be prevented from feeling uncomfortable or being pushed forward and turning forward. Also, since the backrest tilts in conjunction with the tilt of the seat, when the seated person takes a natural forward tilting posture according to the tilt of the seat, the seat and the backrest will naturally tilt the back and back. It is possible to support stably according to the posture, and it is possible to improve the comfort of the seated person as compared with the case where the backrest does not tilt at all. In addition, the seat swing axis and the center of bending and stretching of the seated person's legs are close to each other, and the seat can be tilted and the posture can be changed at a fixed position. The posture can be smoothly changed while maintaining the state, and the burden on the seated person can be reduced and the posture can be easily changed. Furthermore, it has an independent configuration as a tilting mechanism for the seat and the backrest, and functions independently as a tilting mechanism for the chair in which the seat and the backrest are interlocked, so there is no restriction on the form of the legs or the overall configuration of the chair Therefore, the versatility can be improved.

According to the synchronous tilt mechanism of the chair according to claim 2 , since the backrest can be tilted independently irrespective of the tilt of the seat, the rear portion of the pushed-up seat is lowered and the seat and the backrest are lowered. When the inclination is restored, the seat is returned to the horizontal direction while the angle between the seat and the backrest is closed, and the backrest pushes the back, causing the seated person to feel uncomfortable or being pushed forward In addition to preventing this, the seated person can easily return the tilted seat to the horizontal direction by sitting deeply on the seat and taking a backward tilt posture. Also, by tilting the backrest independently of the tilting of the seat, the tilting of the backrest associated with the tilting of the seat can be matched to the seated person's posture, so when the seat is tilted when the rear part is pushed up It is possible to more surely prevent the seated person from feeling uncomfortable or being pushed back by turning the back more than the natural forward tilted posture of the seated person and pushing the back.

  Hereinafter, the configuration of the present invention will be described in detail based on the best mode shown in the drawings.

  1 to 5 show an example of an embodiment of a synchronous tilt mechanism of the present invention. The synchrony tilt mechanism 1 of the chair includes a main frame 2 attached to the upper end of a pedestal 11 and a seat that supports a seat plate 8 of a seat 10 and has a front part swingably connected to a front part of the main frame 2. A plate support member 9, a link member 6 whose front part is swingably connected to the main frame 2, and a back support member 4 that supports the backrest 3 are fixed, and the upper part swings to the rear part of the seat plate support member 9. A seat back support member 5 is interposed between the back support member fixing portion 5, which is movably connected and whose lower portion is swingably connected to the rear portion of the link member 6, and the main frame 2 and the seat plate support member 9. It is comprised with the tilting power source 17 which exhibits the force which pushes up the rear part of the member 9.

  The main frame 2 is a base that supports the seat 10 and the backrest 3 with respect to the pedestal 11, and is a base of the synchronous tilt mechanism 1.

  The seat 10 includes a seat portion 7 and a seat plate 8. The seating portion 7 is formed by, for example, urethane foam and a tension fabric covering the urethane foam.

  The front portion of the seat plate support member 9 is pivotably connected to the front portion of the main frame 2 by the first connecting shaft 12. As a result, when the rear part is pushed up, the seat plate support member 9 tilts the seat 10 by tilting the axis of the first connecting shaft 12 as the pivot axis.

  The front part of the link member 6 is connected to the center part of the main frame 2 and the second connecting shaft 13 so as to be swingable. As a result, the link member 6 swings with respect to the main frame 2 with the axis of the second connecting shaft 13 as the swing axis.

  The upper part of the backrest support member fixing part 5 is swingably connected to the rear part of the seat plate support member 9 by the fourth connecting shaft 15, and the lower part is swinged by the rear part of the link member 6 and the fifth connecting shaft 16. Connected as possible. Therefore, the backrest support member fixing portion 5 tilts the link member 6 as the seat plate support member 9 tilts, and swings and tilts relative to the seat plate support member 9 and the link member 6. Thereby, the backrest 3 tilts via the backrest support member 4 fixed to the backrest support member fixing portion 5.

  The distance between the first connecting shaft 12 and the second connecting shaft 13, the distance between the first connecting shaft 12 and the fourth connecting shaft 15, the fourth connecting shaft 15 and the fifth connecting shaft. The position of each of the connection shafts 12, 13, 15, 16, including the distance between them and the distance between the fifth connection shaft 16 and the second connection shaft 13, tilts the seat plate support member 9. Accordingly, when the backrest 3 tilts in conjunction with the tilt of the seat 10 by tilting the backrest support member 4, the backrest 3 tilts in the same direction as the seat 10, and the tilt angle of the backrest 3 increases. It is set to be smaller than the tilt angle of the seat 10.

  In the present embodiment shown in FIGS. 1 to 5, when the tilt angle of the seat 10 is 15 degrees, the backrest 3 tilts about 10 degrees in the same direction. The tilt angle of the backrest 3 is suitably about 1/2 to 3/4 of the tilt angle of the seat 10.

  The main frame 2 has a through hole 2d for supporting the first connecting shaft 12 in the front portion and both left and right outer walls 2b and 2b having a through hole 2e for supporting the second connecting shaft 13 near the center, and a bottom plate. 2a. Then, the main frame 2 is attached to the pedestal 11 by, for example, screwing the bottom plate 2 a to the upper end of the pedestal 11. In the present embodiment, the first connecting shaft 12 and the second connecting shaft 13 are supported on both outer walls 2b and 2b via sleeves.

  The main frame 2 has a through hole 2f for supporting the third connecting shaft 14, and has opposing inner walls 2c, 2c at the rear of the main frame 2 and inside the outer walls 2b, 2b.

  A back support member (also called a back support member) 4 is formed in an L-shape with a hollow plate shape, and a back support 3 is attached to the upper portion, and the back support member fixing portion 5 is welded to face both lower side surfaces. It is fixed by.

  The backrest support member fixing portion 5 is formed in a plate shape, and has a through hole 5a through which the fourth connection shaft 15 passes, and a through hole 5b through which the fifth connection shaft 16 passes.

  The link member 6 is formed in a band shape, and has a through hole 6a that allows the second connecting shaft 13 to pass through at the front part, and a through hole 6b that allows the fifth connecting shaft 16 to pass through at the rear part. In the present embodiment, the through hole 6b is elongated in the axial direction of the link member 6 (hereinafter, the through hole 6b is referred to as a long hole 6b), and the fifth connecting shaft 16 is formed so as to be movable in the long hole 6b. Is done.

  Therefore, the backrest support member fixing portion 5 is fixed so that the upper part can swing freely with the axis of the fourth connecting shaft 15 as the swinging axis, and the lower part has the shaft center of the fifth connecting shaft 16 as the swinging shaft. It is fixed so as to be swingable as a core and movable by the axial length of the long hole 6b. In this manner, the swinging connection axis (the center of the fifth connection shaft 16 in this embodiment) between the backrest support member fixing portion 5 and the link member 6 can be moved in the axial direction of the link member 6. As a result, the backrest support member fixing portion 5 tilts with respect to the seat plate support member 9, and the backrest 3 tilts with respect to the seat 10 via the backrest support member 4. In other words, the back hole 3 alone can be tilted relative to the seat 10 independently of the tilt of the seat plate support member 9 by the action of the long hole 6b.

  The seat plate support member 9 includes left and right outer walls 9b, 9b having a through hole 9d for supporting the first connecting shaft 12 at the front, and an upper plate 9a. The seat plate support member 9 is fixed to the seat plate 8 by, for example, screwing the upper plate 9 a to the lower surface of the seat plate 8. In addition, in the top view of FIG. 3, the seat board support member 9 is represented using the dashed-two dotted line.

  The seat plate support member 9 includes a through hole 9e that supports the fourth connecting shaft 15 and brackets 9c and 9c that extend rearward from the rear end of the seat plate support member 9. In the present embodiment, the fourth connecting shaft 15 is supported by brackets 9c and 9c facing each other via a sleeve.

  In addition, as for each connection shaft, what has locking means, such as a washer and a retaining ring, is used for an end part. Moreover, each connection shaft is arrange | positioned in the orthogonal | vertical direction with respect to the front-back direction.

  The tilting power source 17 may be any device as a power source that pushes up the rear portion of the seat plate support member 9 with respect to the main frame 2 to tilt the seat 10. In this embodiment, a gas spring with a lock mechanism is used. . The gas spring 17 with a locking mechanism (hereinafter simply referred to as a gas spring 17) can lock the rod that enters and exits by closing the flow path of the filling gas by an operation of a lever (not shown). The seat plate support member 9 can be fixed at an arbitrary tilt angle by restricting the tilt of the seat plate support member 9.

  The front end of the gas spring 17 is swingably connected to the main frame 2 via the third connection shaft 14, and the rear end is swingable to the seat plate support member 9 via the fourth connection shaft 15. It is connected freely.

  In this embodiment, a U-shaped connecting member 18 having a central portion 18a and opposing side portions 18b, 18b is provided at the front end of the rod at the front end of the gas spring 17. The connecting member 18 has through holes 18c and 18c that allow the third connecting shaft 14 to pass through the side portions 18b and 18b. In addition, a cylindrical portion 17 a having a through hole 17 b through which the fourth connecting shaft 15 passes is provided at the rear end portion of the gas spring 17.

  Further, in the present embodiment, the synchronous tilt mechanism 1 has a spring unit 19. The spring unit 19 is an extendable member having a coil spring 19c therein. In the case of the present embodiment, the spring unit 19 is disposed on the axial centers of the spring mounts 19a and 19b attached to both ends of the coil spring 19c inside the spring unit 19 and the coil spring 19c, and the spring mounts 19a and 19b are pivoted. The guide shaft 19d that is movably connected only in the direction is configured to be extendable and contractible. In FIG. 5, the cover (cylinder) around the coil spring 19c is not shown.

  The front spring mount 19 a of the spring unit 19 is fixed to the front end portion of the receiving metal fitting 20 that extends forward from the rear end portion of the link member 6. Further, the rear spring mount 19 b is pressed against the fifth connecting shaft 16. Thereby, the spring unit 19 functions to urge and press the fifth connecting shaft 16 supported by the long hole 6b toward the rear end of the long hole 6b.

  The operation of the above-described synchronization tilt mechanism 1 will be described below.

  When the lock of the gas spring 17 is released by operating a lever (not shown) in a state where the seat is not inclined (FIG. 1), the fourth connecting shaft 15 penetrating the cylindrical portion 17a is moved by the thrust of the gas spring 17. Accordingly, the rear portion of the seat plate support member 9 is pushed up. Thereby, the seat 10 is inclined (FIG. 2).

  Furthermore, when the fourth connecting shaft 15 is pushed up, the backrest support member fixing portion 5 connected to the fourth connecting shaft 15 is lifted. At this time, the upper portion of the backrest support member fixing portion 5 moves on an arc on which the fourth connection shaft 15 moves around the axis of the first connection shaft 12 at the front portion of the seat plate support member 9. On the other hand, the lower portion of the back support member fixing portion 5 moves on an arc on which the fifth connection shaft 16 moves around the axis of the second connection shaft 13 at the front portion of the link member 6.

  And in this embodiment, the upper part of the backrest support member fixing | fixed part 5 moves on a big circular arc, and a lower part moves on a small circular arc. Therefore, when the rear part is pushed up and the seat plate support member 9 is tilted, the lower part is drawn forward rather than the upper part of the backrest support member fixing part 5. As a result, the support member fixing portion 5 tilts backward with respect to the seat plate support member 9, the angle between the seat plate support member 9 and the backrest 3 opens, and the tilt angle of the backrest 3 is greater than the tilt angle of the seat 10. Becomes smaller. Thereby, the backrest 3 does not lean forward and push the seated person's back more than the seated person's natural forward tilted attitude when the seat 10 tilts. In addition, since the backrest 3 tilts following the natural forward leaning posture of the seated person, it functions as a backrest.

  On the other hand, when lowering the rear portion of the seat 10 that has been pushed up, the backrest 3 and the seat plate support member 9 are tilted while the angle between the two is closed. At this time, in a state where no force is applied to the backrest 3, the fifth connecting shaft 16 is pressed against the rear end of the long hole 6b by the action of the spring unit 19, so that the backrest support member fixing portion 5 and the backrest are supported. Although the backrest 3 is pushed forward through the support member 4, only the backrest 3 is tilted with respect to the seat 10 independently of the tilt of the seat plate support member 9 by the action of the long hole 6b. Can be tilted backwards. As a result, it is possible to prevent the seated person from pushing the back and leaning forward because the backrest 3 is pushed forward and tilts while the angle formed with the seat 10 is closed.

  In addition, although the above-mentioned form is an example of the suitable form of this invention, it is not limited to this, A various deformation | transformation implementation is possible in the range which does not deviate from the summary of this invention. For example, in the present embodiment, in order to connect the members such as the main frame 2 and the seat plate support member 9 so as to be swingable, the left and right walls of both members are provided with through holes, and the through holes of the left and right walls are provided. However, the structure is not limited to this as long as the members are connected to each other in a swingable manner. The left and right through holes may be separately rockably locked, and cylindrical protrusions are provided on the left and right walls of one member and the through holes or the left and right walls of the other member are provided. It is also possible to provide a C-shaped claw portion (bearing portion) and slidably mesh the convex portion with the through hole or the claw portion.

It is a side view which shows the schematic structure of an example of embodiment of the synchronous tilt mechanism of this invention, Comprising: It is a side view which shows the state which the seat does not incline. It is a side view which shows the schematic structure of an example of embodiment of the synchronous tilt mechanism of this invention, Comprising: It is a side view which shows the state which the seat inclined. It is a top view which shows the schematic structure of an example of embodiment of the synchronous tilt mechanism of this invention, Comprising: It is a top view which shows the state which the seat does not incline. It is a side view explaining the structure of connection with a backrest support member fixing | fixed part and a link member. It is sectional drawing explaining the structure and function of a spring unit. It is a side view which shows the chair which makes the conventional seat and backrest interlock | cooperate and tilt. (A) is a side view which shows a back inclination state. (B) is a side view showing a forward tilt state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Synchrony tilt mechanism 2 Main frame 3 Backrest 4 Backrest support member 5 Backrest support member fixing | fixed part 6 Link member 7 Seating part 8 Seat plate 9 Seat plate support member 10 Seat 11 Leg column 17 Tilt power source

Claims (2)

A main frame attached to the upper end of the pedestal, a seat plate support member that supports the seat plate of the seat and whose front part is swingably connected to the front part of the main frame, and the front part swings to the main frame A link member that is freely connected and a backrest support member that supports the backrest are fixed, and an upper portion is swingably connected to a rear portion of the seat plate support member, and a lower portion is swingable to a rear portion of the link member. A backrest support member fixing portion coupled to the main frame and the seat plate support member, and a tilting power source that exerts a force to push up the rear portion of the seat plate support member, A synchrony tilt mechanism for a chair, wherein the tilt angle of the backrest is smaller than the tilt angle of the seat when the backrest is tilted in conjunction with the tilt of the seat. 2. The synchrony tilt mechanism for a chair according to claim 1, wherein a pivot coupling axis between the backrest support member fixing portion and the link member is movable in an axial direction of the link member.

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