JP6815681B1 - Chair with link mechanism and link mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair provided with a link mechanism capable of easily performing standing and sitting movements and reliably sitting in a correct seating position. Another object of the present invention is to prevent the user from being seated for a long time, and to maintain the health of the user. For that purpose, a chair provided with a link mechanism of the present invention extends the center of a seat plate so as to project upward from a center line crossing left and right along a direction orthogonal to the front direction of the user. By urging, the seat plate can be fixed at an appropriate position between the position where the side view becomes mountain-shaped and the position where the side view becomes flat at a predetermined angle. [Selection diagram] FIG. 7

Description

The present invention relates to a chair and a link mechanism provided with a link mechanism, and more specifically, a chair and a link mechanism having a link mechanism in which the position and angle of the seat surface are variably adjusted and can be used in various postures. Regarding.

In recent years, it has been proposed that sitting too much in a chair has an adverse effect on the body regardless of age, and it has been published in papers and the like. When sitting on a chair, the knees and hips are bent almost at right angles, so most of the weight can only be hung on the hips and spinal column, and the adverse effect on the body caused by sitting too much on the chair is this. This is due to being maintained in a posture. On the other hand, various chairs used in homes, schools, offices, etc. are provided. For example, chairs equipped with functions such as height adjustment function (see Patent Document 1 and the like) and standing up. Chairs equipped with a support function (see Patent Document 2 and the like) have also been proposed. For example, the chair disclosed in Patent Document 1 is provided with an operating mechanism such as a rocking mechanism and a height adjusting mechanism for the back seat, and the standing / sitting support chair disclosed in Patent Document 2 is used by the user to stand up. At that time, when the sound of standing up to the microphone is emitted, the sound data is analyzed and the rear part of the seat surface is raised by the electric actuator, and at the same time, the backrest part is also raised upward.

JP-A-2007-105293 JP-A-2014-140435

However, the conventional chairs provided so far, including Patent Documents 1 and 2, can only be seated by bending the knees and hips at a substantially right angle and hanging most of the weight on the hips and spinal column. It was not possible to prevent the adverse effects on the body caused by sitting too much on the chair. Therefore, there is no choice but to change the "sitting style" that is the cause of the adverse effects on the body caused by sitting too much on the chair. Ideally, it is desirable to frequently stand up and sit down even during desk work to avoid lengthening the sitting posture. Further, since the conventional chair can be seated at an appropriate position in the front-rear direction of the seat plate, it is not always possible to sit in the correct seating position and in the correct sitting posture.

Therefore, the present invention has been made in view of such a problem, and is provided with a side view rhombus-shaped link mechanism, and the side view of the seat plate to be seated is mountain-shaped and the side view of the seat plate is flat. It is an object of the present invention to provide a chair having a link mechanism that can be freely changed at an appropriate position between states and the link mechanism thereof.
Further, according to the present invention, the angle and height of the seating surface can be set freely and instantly. For example, the seating surface can be seated not only normally but also in a mid-waisted posture so as to lean against the seating surface. It is an object of the present invention to provide a chair equipped with a link mechanism that can be used in various postures such as sitting down or leaning on a seat surface in a standing position, and a link mechanism thereof.

The invention according to claim 1 in order to solve the above problems is a chair provided with a link mechanism for deforming the seat plate into a side view mountain shape and a flat plate shape, and the link mechanism is on the uppermost stage. An upper link portion provided with a first upper link member and a second upper link member is arranged, and the end sides of the first upper link member and the second upper link member adjacent to each other are directed upward by an urging member. By urging the upper link member so as to protrude, the side view of the upper link member becomes horizontal, and by applying a load against the urging force of the urging member, the side view of the link member becomes horizontal. A support member having a first link unit and a second link unit that move up and down with respect to a position, and a support member having a telescopic shaft is erected between the first link unit and the second link unit. The tip of the first upper link member and the second upper link member are configured to guide the vertical movement of the adjacent end side of the first upper link member, and the first one in the first link unit and the second link unit, respectively. A first seating surface is arranged on the upper link member, and a second seating surface is arranged on each of the second upper link member in the first link unit and the second link unit.

The invention according to claim 2 for solving the above problems is a chair provided with a link mechanism for deforming the seat plate into a side view mountain shape and a flat plate shape, and the link mechanism has one end at the first. One upper link member rotatably connected to the upper link shaft, the other end rotatably connected to the first middle link shaft, and one end rotatably connected to the second upper link shaft. At the same time, the other end is rotatably connected to the first middle link shaft with the upper link portion having the second upper link member rotatably connected to the second middle link shaft. The other end is rotatably connected to the third central link shaft, and one end is rotatably connected to the second central link shaft, and the other end is rotatably connected to the fourth central link shaft. The upper middle link portion provided with the second middle link member rotatably connected to the third middle link member, one end thereof is rotatably connected to the third middle link shaft, and the other end is the first lower link shaft. A third central link member rotatably connected to the fourth central link shaft, one end rotatably connected to the fourth central link shaft, and the other end rotatably connected to the second lower link shaft. (Iv) A lower middle link portion provided with a middle link member, one end rotatably connected to the first lower link shaft, and the other end rotatably connected to the third lower link shaft. It is provided with a first lower link member and a second lower link member having one end rotatably connected to the second lower link shaft and the other end rotatably connected to the fourth lower link shaft. A first link unit and a second link unit configured to include a lower link portion are provided, and the first link unit and the second link unit include the first and second upper link shafts and the first link unit. The first to fourth central link shafts and the first to fourth lower link shafts are arranged so as to face each other so as to be shared with each other, and between the third central link shaft and the third lower link shaft or. An urging member for urging the first link unit and the second link unit upward is erected on either one or both of the fourth central link shaft and the fourth lower link shaft, and the first A support member having a telescopic shaft is erected between the link unit and the second link unit, and the tip of the shaft is arranged so as to hold the first upper link shaft and the second upper link shaft. At the same time, the third lower link shaft and the fourth lower link shaft are configured to be movable up and down along the support member, and the two link mechanisms are arranged so as to be connected in parallel. It is characterized by being placed.

In order to solve the above problems, the invention according to claim 3 is the chair provided with the link mechanism according to claim 2, wherein the first central link member, the third central link member, and / or the second central portion. The link member and the fourth central link member are integrally formed.

In order to solve the above problems, the invention according to claim 4 is the chair provided with the link mechanism according to claim 2 or 3, the first central link member, the third central link member, and / or the first central link member. (Ii) A substantially triangular reinforcing plate is arranged between the central link member and the fourth central link member.

The invention according to claim 5 for solving the above-mentioned problems is a chair provided with the link mechanism according to any one of claims 2 to 4, wherein the first link unit and the second link unit are provided. A first seating surface is arranged on each of the first upper link members in the above, and a second seating surface is arranged on each of the first link unit and the second upper link member in the second link unit. A seat plate for the user to sit on is formed by the first seat surface and the second seat surface, and the first link unit and the second link unit are urged upward by the urging member. The side view of the seat plate becomes horizontal by applying a load against the urging force of the urging member and the position where the center of the seat plate protrudes upward and the side view of the seat plate becomes mountain-shaped. It is characterized in that it moves up and down between the position and the position.

In order to solve the above problems, the invention according to claim 6 is the chair provided with the link mechanism according to any one of claims 2 to 5, wherein the two link mechanisms are connected in parallel. Each of the first link unit and the second link unit is provided with a holding member for integrally holding the third central link shaft and the fourth central link shaft.

In order to solve the above problems, the invention according to claim 7 further determines the shape and height of the seat plate in the chair provided with the link mechanism according to any one of claims 1 to 6. It is characterized by being provided with a seat plate shape adjusting mechanism that is fixed in a state.

In order to solve the above problems, the invention according to claim 8 is a chair provided with the link mechanism according to claim 7, wherein the support provided in each link mechanism in the two link mechanisms connected in parallel. A pedestal for supporting each member (first support member and second support member) is provided, and the pedestal is provided with one or more legs that come into contact with the floor surface.

In order to solve the above problems, the invention according to claim 9 is a chair provided with the link mechanism according to claim 8, wherein the legs are provided with rollers capable of moving, and the rollers are provided at the time of use. It is characterized in that a stopper for fixing it so as not to move is provided.

In order to solve the above problems, the invention according to claim 10 is a chair provided with the link mechanism according to claim 8 or 9, wherein a flip-up type tread plate is attached to the pedestal on the front side. It is characterized by that.

The invention according to claim 11 provides the link mechanism according to any one of claims 1 to 10 in order to solve the above problems.

According to the chair provided with the link mechanism according to the present invention, the side view of the seat plate to be seated can be freely changed at an appropriate position between the mountain-shaped state and the side view of the seat plate to be flat. Since it is possible to do so, the seating style can be changed as appropriate by changing the angle of the seating surface. In other words, the posture is such that the knees and hips are bent almost at right angles, and the shape of the seating plate is appropriately changed from the normal sitting posture in which most of the weight is hung on the hips and spinal column. You can instantly change to use in various postures, such as sitting on the seat, sitting leaning against the seat, or leaning against the seat while standing up, so sitting too much on the chair has an adverse effect on the body. That is, there is an effect that the load applied to the waist and the spinal column can be significantly reduced.

Further, according to the chair provided with the link mechanism according to the present invention, since the side view can be mountain-shaped, the width of the seat plate in the front-rear direction becomes compact, and the distance from the center of the seat plate to the user's foot. Can be shortened, and the bending angle of the upper body when sitting can be reduced accordingly. Therefore, when sitting in a normal posture, the user does not have to bend his upper body significantly, but simply rests his buttocks lightly on the center top of the seat plate, which is the correct seating position, and changes from a standing posture to a sitting posture. You can make a smooth transition, and you don't have to put unnecessary force on your legs. In addition, by ensuring that the buttocks are located at the top of the seat plate when the user starts sitting, the deforming seat plate supports the user's thighs in the process of shifting from the standing posture to the sitting posture. At the same time, the back side of the knee is gradually pushed by the tip of the seat plate to promote the flexion of the knee, so that the user's posture is promoted to the optimum sitting posture, and it is not necessary to sit again after sitting.

Further, according to the chair provided with the link mechanism according to the present invention, when the user shifts from the sitting posture to the standing posture, the tip of the seat plate gradually retracts to the rear of the user, so that the user is seated. Even if the legs of the chair wrap around below the seat plate, the tip of the seat plate does not hit the back of the knee and interfere with the standing. Therefore, the user can shift from the sitting posture to the standing posture by simply extending his / her knees lightly without bending his / her upper body greatly, and does not need to put unnecessary force on his / her legs. In addition, since the tip of the seat plate does not hit the back of the knee in the process of standing up, it is unlikely that the user will lose balance by pushing the chair behind the knee.

Further, the link mechanism according to the present invention has an effect that a chair provided with the link mechanism according to the present invention can be realized. Further, the link mechanism according to the present invention can be used not only for chairs but also for other purposes.

FIG. 1 is a side view showing an embodiment of a chair provided with a link mechanism according to the present invention in a state where the seat plate has a mountain shape. FIG. 2 is a side view showing an embodiment of a chair provided with a link mechanism according to the present invention in a state where the seat plate is horizontal. FIG. 3 is a plan view of the chair shown in FIGS. 1 and 2. FIG. 4 is a rear view of an embodiment of the link mechanism. FIG. 5 is a perspective view showing the link mechanism and its surroundings. FIG. 6 is a partially enlarged view of FIG. 7 (A) to 7 (F) are explanatory views explaining the movement of the chair. FIG. 8 is an explanatory view illustrating the seat plate shape adjusting mechanism. FIG. 9 is an explanatory diagram illustrating the movement of the flip-up type tread plate. FIG. 10 is an explanatory diagram showing a usage state of the chair of the present embodiment.

Hereinafter, the chair and the link mechanism provided with the link mechanism according to the present invention will be described in detail with reference to the drawings of some preferable embodiments.

<Outline structure of chair>
FIG. 1 is a side view showing an embodiment of a chair provided with a link mechanism according to the present invention in a state where the seat plate is mountain-shaped, and FIG. 2 is a side view showing an embodiment of the chair according to the present invention in a state where the seat plate is in a mountain shape. 3 is a plan view of the chair shown in FIGS. 1 and 2, and FIG. 4 is a rear view of the embodiment of the link mechanism.
As shown in FIGS. 1 to 4, in the chair 1 of the present embodiment, the seat plate 11 is roughly deformed between a side view mountain shape (state shown in FIG. 1) and a flat plate shape (state shown in FIG. 2). A metal (for example, stainless steel) link mechanism 12 is provided, and the link mechanism 12 is arranged on the pedestal 30. A backrest 20 is attached to the pedestal 30 of the chair 1, and a handle 40 is attached to the second upper link member 2U (details will be described later). Further, a flip-up type tread plate 70 (details will be described later) is attached to the pedestal 30. As shown in FIG. 7, which will be described later, the shape of the seat plate 11 of the present embodiment can be freely changed. For example, the seat plate 11 has a pair of seat surfaces 11-1 and 11-2, respectively. It is composed of an integrally formed urethane mat with cushioning properties. Then, the seat plate 11 is formed by covering the entire urethane mat with a flexible vinyl chloride cover.

<Outline configuration of link mechanism>
In the link mechanism 12 that deforms the seat plate 11 into a mountain shape and a flat plate shape (horizontal shape), an upper link portion UL having a first upper link member 1U and a second upper link member 2U is arranged at the uppermost stage, and the first Side view of the upper link members 1U and 2U by urging the end sides of the upper link member 1U and the second upper link member 2U adjacent to each other so as to project upward by the urging members 50 and 50. (See FIG. 1) and the position where the side views of the link members 1U and 2U become flat (horizontal) by applying a load against the urging forces of the urging members 50 and 50 (see FIG. 1). A first link unit 12A and a second link unit 12B that move up and down with (see 2) are provided (see FIG. 4).

Then, a support member 13 provided with a telescopic shaft 131 is erected between the first link unit 12A and the second link unit 12B, and the tip of the shaft 131 is the first upper link member 1U and the second upper link. It is configured to guide the vertical movement of the adjacent end side of the member 2U.

<Specific configuration of the link mechanism>
Further, the link mechanism 12 will be described in detail. As described above, the link mechanism 12 is a mechanism for deforming the seat plate 11 between a position having a side view mountain shape (see FIG. 1) and a flat plate shape (horizontal shape) (see FIG. 2). Yes, the link mechanism 12 includes a first link unit 12A and a second link unit 12B having the same configuration as each other (see FIG. 5). Each of the first link unit 12A and the second link unit 12B includes an upper link portion UL, an upper middle link portion UML, a lower middle link portion LML, and a lower link portion LL.

The upper link portion UL has one end rotatably connected to the first upper link shaft 1u and one end rotatably connected to the first middle link shaft 1m. The second upper link member 2U is rotatably connected to the second upper link shaft 2u and the other end is rotatably connected to the second central link shaft 2m.

The upper central link portion UML includes a first central link member 1M having one end rotatably connected to the first central link shaft 1 m and the other end rotatably connected to the third central link shaft 3 m. The second central link member 2M is provided with one end rotatably connected to the second central link shaft 2 m and the other end rotatably connected to the fourth central link shaft 4 m.

The lower central link portion LML has a third central link member having one end rotatably connected to the third central link shaft 3 m and the other end rotatably connected to the first lower link shaft 1n. 3M and a fourth central link member 4M having one end rotatably connected to the fourth central link shaft 4m and the other end rotatably connected to the second lower link shaft 2n.

The lower link portion LL has a first lower link member 1L having one end rotatably connected to the first lower link shaft 1n and the other end rotatably connected to the third lower link shaft 3n. The second lower link member 2L is provided with one end rotatably connected to the second lower link shaft 2n and the other end rotatably connected to the fourth lower link shaft 4n.

<Relationship between the first and second link units>
The first link unit 12A and the second link unit 12B are the first upper link shaft 1u, the second upper link shaft 2u, the first central link shaft 1 m, the second central link shaft 2 m, the third central link shaft 3 m, and the first. The four central link shafts 4 m, the first lower link shaft 1n, the second lower link shaft 2n, the third lower link shaft 3n, and the fourth lower link shaft 4n are arranged to face each other so as to be shared with each other (4n). FIG. 4).

Further, either one or both of the third central link shaft 3m and the third lower link shaft 3n or the fourth central link shaft 4m and the fourth lower link shaft 4n (both in the figure) are the first. An urging member 50 for urging the one link unit 12A and the second link unit 12B so as to extend upward is erected. As the urging member 50, for example, a coil spring can be used, but other members such as an air cylinder and a hydraulic cylinder can also be used as appropriate.

Further, a support member 13 having a telescopic shaft 131 is erected between the first link unit 12A and the second link unit 12B, and the tips of the shaft 131 are the first upper link shaft 1u and the second upper link shaft. The third lower link shaft 3n and the fourth lower link shaft 4n are arranged so as to hold 2u, and are configured to be movable up and down along the support member 13. Further, the third central link shaft 3 m and the fourth central link shaft 4 m are held at predetermined positions of the support member 13, and the positions do not change when the first link unit 12A and the second link unit 12B expand and contract.

<Double type>
FIG. 5 is a perspective view showing the link mechanism and its surroundings.
As shown in FIG. 5, the chair 1 of the present embodiment is arranged so that two link mechanisms 12 and 12 are connected in parallel as a pair. By arranging the two link mechanisms 12 and 12 in parallel as a pair in this way, the stability of the chair 1 can be improved. In order to absorb the impact when the shaft 131 expands and contracts, an urging member such as a coil spring may be arranged inside the support member 13 (reference numeral 51 in FIG. 4).

<Joint part of link member>
FIG. 6 is a partially enlarged view of FIG.
As shown in the portion surrounded by the broken line in FIG. 6, the link mechanism 12 used in the chair 1 of the present embodiment includes the first central link member 1M, the third central link member 3M, and the second central link member 2M. The fourth central link member 4M is integrally formed. In this case, only one of them can be integrally formed. In the example shown in FIG. 6, the first central link member 1M and the third central link member 3M are integrally formed, and the second central link member 2M and the fourth central link member 4M are also integrally formed. As a result, the number of members and the number of movable parts (the number of joints) can be reduced, so that the strength and durability of the chair 1 can be increased.

Further, as shown in the portion surrounded by the broken line in FIG. 6, the link mechanism 12 used in the chair 1 of the present embodiment is located between the first central link member 1M and the third central link member 3M and the third. A substantially triangular reinforcing plate P is arranged between the second central link member 2M and the fourth central link member 4M. In this case, a substantially triangular reinforcing plate P may be arranged between only one of them. In the example shown in FIG. 6, it is omitted between the first central link member 1M and the third central link member 3M, and between the second central link member 2M and the fourth central link member 4M. A triangular reinforcing plate P is arranged. As a result, the strength and durability of the chair 1 can be further increased. The attachment angle of the first central link member 1M and the third central link member 3M and the attachment angle of the second central link member 2M and the fourth central link member 4M can be 90 °, respectively, but are smaller than 90 °. It is even better to set the angle (for example, in the range of 70 to 80 °, specifically 75 °).

<Composition of seat plate>
As shown in FIG. 5, in the chair 1 of the present embodiment, the first seat surface 11-1 is arranged on the first upper link member 1U of the first link unit 12A and the second link unit 12B, and the first seat surface 11-1 is arranged. A second seat surface 11-2 is arranged on each of the second upper link members 2U in the link unit 12A and the second link unit 12B, and these first seat surface 11-1 and second seat surface 11-2 are arranged. A seat plate 11 for the user to sit on is formed. In the present embodiment, the seat plate 11 is made of a cushioning urethane mat in which a pair of first seat surfaces 11-1 and second seat surfaces 11-2 are integrally formed. It is constructed by covering the entire urethane mat with a flexible vinyl chloride cover.

7 (A) to 7 (F) are explanatory views explaining the movement of the chair.
As shown in FIG. 7A, when not in use, the first link unit 12A and the second link unit 12B constituting the pair of link mechanisms 12 and 12 are respectively urged upward by the urging member 50. Therefore, the center of the seat plate 11 protrudes upward, and the side view of the seat plate 11 has a mountain shape. Then, by applying a downward load against the urging force of the urging member 50, the first link unit 12A and the second link unit 12B are lowered downward as shown in FIGS. 7A to 7F. However, the seat plate 11 is continuously deformed to become a flat plate (horizontal). The first link unit 12A and the second link unit 12B project upward again by the urging member 50 except for the downward load on the seat plate 11 from the state where the seat plate 11 is flat (horizontal). It will be in the state of

<About holding member>
The pair of link mechanisms 12 and 12 are provided with a holding member P1 that integrally holds the third central link shaft 3 m and the fourth central link shaft 4 m of the first link unit 12A and the second link unit 12B, respectively. (See FIG. 6). Since the third central link shaft 3 m and the fourth central link shaft 4 m are held by the support member 13 and restrained from each other by the holding member P1, for example, rattling during deformation of the seat plate 11 is prevented and the movement is smooth. As it becomes, the stability as a chair 1 increases. Further, the members held by the holding member P1 can share a part of the mechanism (for example, the seat plate shape adjusting mechanism 60 below), which is efficient. The holding member P1 can also be formed of a member common to the beam member 63 (FIG. 4) erected between the pair of link mechanisms 12, 12.

<Seat plate shape adjustment mechanism>
As shown in FIG. 6, the chair 1 of the present embodiment includes a seat plate shape adjusting mechanism 60 that fixes the shape and height of the seat plate 11 in a predetermined state. The seat plate shape adjusting mechanism 60 of the present embodiment is, for example, as shown in FIGS. 4 and 8, below the beam member 62 erected between the first upper link shafts 1u of the pair of link mechanisms 12 and 12, respectively. It can rotate around a shaft fixed to a beam member 63 erected between a plate-shaped brake plate 61 hanging to the side and a third central link shaft 3 m of each of the pair of link mechanisms 12 and 12. The eccentric cam 60A, the lever 60B attached to the eccentric cam 60A, the fixing member 60C fixed to the beam member 63 so as to face the opposite side of the eccentric cam 60A with the brake plate 61 interposed therebetween, and the beam member 63 and the beam member 63. It is provided with a tension spring 60D that pulls the beam members 64 erected between the third lower link shafts 3n of the pair of link mechanisms 12 and 12 in a direction approaching each other. In FIG. 4, the lever 60B and the like are omitted. Further, the beam member 65 erected between the first central link shafts 1 m of the pair of link mechanisms 12 and 12 is provided with a predetermined opening for inserting the brake plate 16, and the brake plate 16 is provided with a predetermined opening. It has a function to guide the movement direction so that it does not deviate from the vertical direction. In this configuration, the eccentric cam 60A comes into contact with the contact portion T at a predetermined height position of the brake plate 61 depending on the position of the lever 60B to prevent the brake plate 61 from moving up and down, and is separated from the brake plate 61. It is designed to rotate between the brake plate 61 and a position that does not hinder the vertical movement of the brake plate 61. As a result, when the user grasps the lever 60B by hand and pushes it from the horizontal state on the left side of FIG. 8 to the inclined state on the right side of FIG. 8, the cam surface of the eccentric cam 60A and the fixing member 60C press the brake plate 61 from both sides. Hold it with a constant force and restrain (clamp) it. As a result, the vertical movement of the brake plate 61 is restricted, so that the height position and shape of the seat plate 11 can be instantly fixed. When the user returns the lever 60B to the horizontal state (shown on the left side of FIG. 8) from that state, the cam surface of the eccentric cam 60A separates from the contact portion T, and the brake plate 61 has the eccentric cam 60A and the fixing member 60C. The brake plate 61 can be moved up and down, and the height position and shape of the seat plate 11 can be changed. Therefore, the user can change the height position and shape of the seat plate 11 and simply push the lever 60B downward from the horizontal state at a desired timing to adjust the height and shape of the seat plate 11 to a desired height. And can be instantly fixed to the shape.

<About the pedestal>
As shown in FIG. 5, the chair 1 of the present embodiment is a pedestal that supports the support members 13 (first support member 13-1 and second support member 13-2) provided on the pair of link mechanisms 12 and 12, respectively. The pedestal 30 is provided with one or a plurality (four in FIG. 5) of legs 31, 31, 31, 31 that come into contact with the floor surface.

Rollers (casters) that allow the chair 1 to move are attached to the legs 31, 31, 31, and 31, and the rollers (casters) are provided with stoppers for fixing the chairs so that they do not move during use. There is. If the link mechanisms 12 and 12 are made of metal, the weight of the chair 1 becomes heavy and it may be difficult for the user to lift and move them. Therefore, these legs 31, 31, 31 and 31 can be moved and fixed. It is convenient to configure it. For example, a spring member having an appropriate urging force (a force larger than the own weight of the chair 1 and smaller than the force applied when the load of the user is applied) is arranged inside the legs 31, 31, 31, 31, 31. As a result, when a load equivalent to the weight of the user of the chair 1 is applied, the bottom surfaces of the legs 31, 31, 31, 31 and 31 come into contact with the floor surface to prevent the chair 1 from moving, and the load is applied to the chair 1. A stopper mechanism can be provided so that the casters can move away from the bottom surfaces of the legs 31, 31, 31, 31 and 31 when the chair is not applied. According to such a stopper mechanism, when the user is sitting on the chair 1 (or when the foot plate 70, which will be described later, is lowered and the user puts his / her feet on it), the legs 31, 31, 31, 31, 31 Since the chair 1 is fixed to the floor surface by the frictional force between the bottom surface and the floor surface, the chair 1 is stably fixed to the position without moving. On the other hand, when the user does not apply a load to the chair 1, the casters are effective, so that the frictional force is not generated, and the user can easily move the chair 1 in parallel simply by pushing or pulling it lightly. It becomes.

<About the tread>
FIG. 9 is an explanatory diagram illustrating the movement of the flip-up type tread plate.
As shown in FIG. 9, in the chair 1 of the present embodiment, a flip-up type tread plate 70 is attached to the front side of the pedestal 30. Since the flip-up type tread plate 70 is rotatably attached to a rotation shaft fixed to the pedestal 30, the user can change the posture of the tread plate 70 when not in use to the "jump-up state" on the left side of FIG. When in use, the tread plate 70 can be "horizontally in contact with the floor" on the right side of FIG. Therefore, when the chair 1 is used, the user can put at least a part of the body weight on the tread plate 70 through his / her feet, so that the stability of the chair 1 is improved. Specifically, when the user shifts between the sitting posture and the standing posture (FIG. 10), the chair 1 retracts behind the user when the user rides on the tread plate 70, or the chair. It is possible to prevent 1 from falling to the rear side.

Further, as shown in FIG. 9, a lever 71 that can be operated by a foot is attached to the tread plate 70. The lever 71 is attached at an angle substantially perpendicular to the plate surface of the tread plate 70 upward. In this case, when the lever 71 is tilted, the tread plate 70 is in a flip-up state (left side in FIG. 8), and when the lever 71 is raised, the tread plate 70 is in a horizontal state (right side in FIG. 8). As a result, the chair 1 can be easily moved.

<Operation of chair 1>
FIG. 10 is an explanatory diagram showing a usage state of the chair of the present embodiment.
In the chair 1 of the present embodiment, the seat plate 11 is urged along the direction (upper) Db orthogonal to the front direction Da of the user 2 when the user 2 is seated. This urging force acts so as to project the center line LC that crosses the center of the seat plate 11 in the left-right direction when viewed from the user 2 toward the upper Db. Moreover, the chair 1 of the present embodiment is an appropriate position between a position where the side view is mountain-shaped at a predetermined angle (FIG. 7 (A)) and a position where the side view is planar (FIG. 7 (F)). (For example, at any position of FIGS. 7 (A) to 7 (F)), the seat plate 11 can be easily fixed.

<Effect of this embodiment>
The chair 1 of the present embodiment is at an appropriate position (for example,) between a position where the side view is mountain-shaped at a predetermined angle (FIG. 7 (A)) and a position where the side view is flat (FIG. 7 (F)). It is possible to fix the seat plate 11 at any position of FIGS. 7 (A) to 7 (F)). Therefore, the user 2 of the chair 1 of the present embodiment can not only select either a completely standing posture (not shown) or a completely sitting posture (right side of FIG. 10), but also a standing posture and a sitting posture (not shown). It is also possible to freely select an arbitrary posture in the middle (right side of FIG. 10). That is, from the normally seated state (right side in FIG. 10), the user 2 grasps the lever 60B by hand and pushes it from the horizontal state to the inclined state to instantly change the shape of the seat plate 11 as appropriate. Can be done. Therefore, from the normal sitting posture in which the knees and hips are bent almost at right angles, you can instantly change to various postures such as sitting in a mid-waisted posture, sitting leaning against the seat surface, or leaning against the seat surface while standing up. Can be changed to. Therefore, there is an effect that the adverse effect on the body due to sitting too much on the chair, that is, the load applied to the waist and the spinal column can be significantly reduced.

In recent years, as research results have been announced that the longer the sitting posture is, the more harmful it is to health, either maintain the standing posture without sitting, or maintain a posture as close to the standing posture as possible even if sitting. Is considered preferable. In this respect, the chair 1 of the present embodiment can fix the seat plate 11 at any position shown in FIGS. 7 (A) to 7 (F), so that the chair 1 can sit lightly in a posture close to the standing posture. It is possible to appropriately change the seating depth according to the degree of fatigue.

Specifically, at the start of desk work, the user 2 sets the angle of the top of the seat plate 11 to be steep (for example, FIG. 7A) and sits shallowly on the chair 1. After that, when the user 2 feels tired, the angle of the top of the seat plate 11 is set to be gentle (for example, FIG. 7D) to increase the sitting depth. After that, if the fatigue is resolved, the angle of the top of the seat plate 11 may be switched to steep again (for example, FIG. 7A), and if the fatigue is not resolved, the angle of the top of the seat plate 11 may be further increased. It may be switched to gradual (for example, FIG. 7F).

Further, when the user 2 is standing, the side view of the seat plate 11 is mountain-shaped, and the width of the seat plate in the front-rear direction Da is narrow and compact, so that the seat plate 11 is from the center to the foot of the user 2. The distance L0 can be shortened, and the bending angle θ of the upper body when seated can be reduced accordingly. Therefore, the user 2 can smoothly shift from the standing posture to the sitting posture by simply lightly placing his / her buttocks on the central top of the seat plate 11, which is the correct sitting position, without bending the upper body greatly. , There is no need to put unnecessary force on the legs and hips. Further, if the user 2 positions the buttocks on the top of the seat plate 11 at the start of sitting (left side in FIG. 10), the user 2 shifts from the standing posture to the sitting posture (right side in FIG. 10). Since the deforming seat plate supports the thighs of the user 2 and gradually pushes the back side of the knee with the tip of the seat plate to promote the flexion of the knee, the posture of the user 2 is promoted to the optimum sitting posture and the seating is performed. You don't have to sit back later.

Further, according to the chair 1 of the present embodiment, in the process of the user 2 shifting from the sitting posture (right side of FIG. 10) to the standing posture (left side of FIG. 10), the tip of the seat plate 11 gradually moves to the rear of the user 2. Therefore, even if the foot of the user 2 wraps around below the seat plate 11 when seated, the situation where the tip of the seat plate 11 hits the back of the knee and interferes with the standing up does not occur. Therefore, the user 2 can shift from the sitting posture (right side in FIG. 10) to the standing posture by simply extending his / her knees lightly without bending his / her upper body greatly, and it is necessary to put unnecessary force on his / her legs. Absent. Further, since the tip of the seat plate 11 does not hit the back of the knee in the process of the user 2 standing up, it is considered unlikely that the user 2 loses his / her balance by pushing the chair behind the knee.

Therefore, according to the chair 1 of the present embodiment, the user 2 can easily stand up from the seated state (right side of FIG. 10), so that it is possible to prevent the user 2 from being seated for a long time, and by extension, There is an effect that the health of the user 2 can be maintained.

As a result of the above, the user 2 of the chair 1 of the present embodiment can acquire the habit of sitting as shallow as possible and changing the posture diligently (that is, the habit of "avoiding too much sitting"). is there. If you avoid sitting too much in this way, for example, moving around the room to get drinks will not be a hassle, and you can expect improvements in work motivation, work efficiency, children's academic ability, etc. it can. Furthermore, it may be possible to reduce the risk of illness caused by sitting too much and maintain good health.

11 Seat plate 12A 1st link unit 12B 2nd link unit 12 Link mechanism 131 Shaft 13 Support member 1L 1st lower link member 1M 1st central link member 1U 1st upper link member 1n 1st lower link shaft 1m 1st Central link shaft 1u 1st upper link shaft 20 Backrest 2L 2nd lower link member 2M 2nd central link member 2U 2nd upper link member 2n 2nd lower link shaft 2m 2nd central link shaft 2u 2nd upper link shaft 30 Pedestal 31 Leg 3M 3rd central link member 3n 3rd lower link shaft 3m 3rd central link shaft 40 Handle 4M 4th central link member 4n 4th lower link shaft 4m 4th central link shaft 50 Biasing member 60 Seat plate shape adjustment mechanism 61 Brake plate 62 Beam member 63 Beam member 64 Beam member 60A Eccentric cam 60B Lever 60C Fixing member 70 Tread plate 71 Lever LC Center line LL Lower link part LML Lower middle link part P Reinforcing plate P1 Holding member T Contact part UL Upper link Part UML Upper middle link part

Claims (11)

It is a chair equipped with a link mechanism for transforming the seat plate into a side view mountain shape and a flat plate shape.
The link mechanism
An upper link part having a first upper link member and a second upper link member is arranged on the uppermost stage.
By urging the end side of the first upper link member and the second upper link member adjacent to each other so as to project upward by the urging member, the side view of the upper link member becomes mountain-shaped. A first link unit and a second link unit that move up and down between the position where the link member is formed and the position where the side view of the link member becomes horizontal by applying a load against the urging force of the urging member.
A support member having a telescopic shaft is erected between the first link unit and the second link unit, and the tip of the shaft is adjacent to the first upper link member and the second upper link member. It is configured to guide the vertical movement of the end side,
A first seating surface is arranged on each of the first upper link members in the first link unit and the second link unit, and the second upper link member in each of the first link unit and the second link unit. Has a second seating surface,
A chair with a link mechanism that features this. It is a chair equipped with a link mechanism for transforming the seat plate into a side view mountain shape and a flat plate shape.
In the link mechanism, one end is rotatably connected to the first upper link shaft, the other end is rotatably connected to the first middle link shaft, and one end is the second upper part. An upper link portion having a second upper link member rotatably connected to the link shaft and rotatably connected to the second middle link shaft at the other end.
One end is rotatably connected to the first central link shaft, the other end is rotatably connected to the third central link shaft, and one end is rotatably connected to the second central link shaft. An upper middle link portion having a second central link member rotatably connected and the other end rotatably connected to the fourth central link shaft,
A third central link member rotatably connected to the third central link shaft at one end and rotatably connected to the first lower link shaft at the other end, and a fourth central link at one end. A lower middle link portion provided with a fourth middle link member rotatably connected to the shaft and rotatably connected to the second lower link shaft at the other end.
One end is rotatably connected to the first lower link shaft, the other end is rotatably connected to the third lower link shaft, and one end is the second lower part. A lower link portion having a second lower link member rotatably connected to the link shaft and rotatably connected to the fourth lower link shaft at the other end.
The first link unit and the second link unit configured by
In the first link unit and the second link unit, the first and second upper link shafts, the first to fourth middle link shafts, and the first to fourth lower link shafts are shared with each other. Arranged so as to face each other,
The first link unit and the second link are located between the third central link shaft and the third lower link shaft, or between the fourth central link shaft and the fourth lower link shaft, or both. An urging member that urges the unit upward is erected,
A support member having a telescopic shaft is erected between the first link unit and the second link unit, and the tip of the shaft holds the first upper link shaft and the second upper link shaft. The third lower link shaft and the fourth lower link shaft are configured to be movable up and down along the support member.
A chair equipped with a link mechanism, characterized in that two of the link mechanisms are connected in parallel. In the chair provided with the link mechanism according to claim 2.
A chair provided with a link mechanism, wherein the first central link member, the third central link member, and / or the second central link member and the fourth central link member are integrally formed. In the chair provided with the link mechanism according to claim 2 or 3.
A link characterized in that a substantially triangular reinforcing plate is arranged between the first central link member and the third central link member and / or between the second central link member and the fourth central link member. A chair with a mechanism. A chair provided with the link mechanism according to any one of claims 2 to 4.
A first bearing surface is arranged on each of the first upper link members in the first link unit and the second link unit, and the second upper link member in each of the first link unit and the second link unit. A second seat surface is arranged in the seat, a seat plate for a user to sit on is formed by the first seat surface and the second seat surface, and the first link unit and the second link unit are formed by the urging member. Is urged upward so that the center of the seat plate protrudes upward and the side view of the seat plate becomes a mountain shape, and a load is applied against the urging force of the urging member. A chair provided with a link mechanism, which is characterized in that the seat plate moves up and down from a position where the side view of the seat plate becomes horizontal. In the chair provided with the link mechanism according to any one of claims 2 to 5.
The two link mechanisms connected in parallel are provided with a holding member for integrally holding the third central link shaft and the fourth central link shaft of the first link unit and the second link unit, respectively. ing,
A chair with a link mechanism that features this. In the chair provided with the link mechanism according to any one of claims 1 to 6.
Further, a chair provided with a link mechanism, which is provided with a seat plate shape adjusting mechanism for fixing the shape and height of the seat plate in a predetermined state. In the chair provided with the link mechanism according to claim 7.
A pedestal for supporting each of the support members (first support member and second support member) provided in each of the link mechanisms in the link mechanism connected in parallel is provided.
A chair provided with a link mechanism, wherein the pedestal is provided with one or more legs that come into contact with the floor surface. In the chair provided with the link mechanism according to claim 8.
A chair provided with a link mechanism, characterized in that the legs are provided with rollers that allow movement, and the rollers are provided with stoppers for fixing the rollers so that they do not move during use. In the chair provided with the link mechanism according to claim 8 or 9.
A chair equipped with a link mechanism, characterized in that a flip-up tread plate is attached to the pedestal on the front side. The link mechanism according to any one of claims 1 to 10 .

Images