JP2019037383A - Chair - Google Patents

Abstract

To provide a chair which can perform proper support corresponding to motion of a body of a seated person, even when the attitude of the seated person is changed and the centroid is moved, can be stably used in the attitude thereafter, enables the seated person to obtain a comfortable seating feeling even when the person is seated for a long time, and enables the seated person to stably maintain high work efficiency, with a simple structure.SOLUTION: A chair includes: legs erected from a floor surface; a seat 3 provided above the legs; and a support device 2 which has a forward and backward support mechanism 24 arranged below the seat 3 and movably supporting the seat 3 at least on two parts in a forward and backward direction, and a left and right support mechanism 23 arranged below the seat 3 and turnably supporting the seat 3 around a shaft m. Both of the support mechanisms 24, 23 include a seat inclination function for inclining downward a tip side in the movement direction of the seat 3 according as the seat 3 moves from a prescribed reference position, respectively. Furthermore, there is provided a return force generation device P for generating, according to a movement quantity, return force in a direction for returning the seat 3 moved in a backward direction or a left and right direction from the reference position, to the reference position.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a chair that can be suitably applied to an office rotary chair or the like.

  Conventionally, many chairs such as office swivel chairs have been devised for the purpose of maintaining a comfortable sitting posture for a long time in an office or home (for example, see Patent Document 1).

  These office swivel chairs are designed to allow the seat and back to tilt mainly in response to the seated person's backward and forward tilting movements so that the seated person can feel comfortable when working. Or the seat and the back can be fixed at a position where the required posture of the seated person can be realized.

  By the way, a seated person who has been sitting on an office swivel chair for a long time can usually be seen in his / her side as if he / she is still in a comfortable posture, but in practice, it is always It has been clarified that a comfortable seating posture by the office swivel chair is maintained by operating the lumbar region, the buttocks region, and the thigh region.

  Specifically, many seated persons seem to be stationary in a comfortable sitting posture at first glance, but actually, the positions of the waist and buttocks in a posture that is generally comfortable are viewed in plan view. It has been found that the user can maintain the comfort of sitting while moving in the front-rear direction and the left-right direction as the center. In addition, it has been found that a person who can perform such an operation smoothly does not feel uncomfortable for the seated person, and further contributes to an improvement in work efficiency of the sitting work.

  Therefore, it can be said that the present chair is required to have a function that can favorably support the above-described behavior of the seated person.

  As a thing close | similar to such a concept, the thing provided with the support mechanism of the seat as shown to patent document 2 can be mentioned.

JP 2012-010938 A Japanese National Patent Publication No. 10-513374

  However, in the support mechanism disclosed in Patent Document 2, the seat swings around the contact point between the lower end of the support column and the floor, which is disposed directly below the center of the seat, as a rotation fulcrum. As a result, the moment to tilt the support column increases, so if the occupant tries to tilt backward, he / she falls out of balance, and in a forward tilting posture, he / she needs to step on his / her foot to balance it. In addition, the struts fall in the same direction in either the front, back, left, or right direction, so it may be suitable for a stool. Since it is customary that the movement of the person's body is different, it is difficult to say that support corresponding to the movement of the body of the seated person can be performed appropriately.

  In addition, this support mechanism has a structure in which the pillar descends when the seated person sits down and the lower end touches the floor, so that the seat sinks every time it sits down, and the pillar is in the grounded state. There is a problem that the floor is easily damaged by swinging.

  The object of the present invention is to solve the above-mentioned problems, and it is possible to provide appropriate support corresponding to the movement of the body in all directions of the seated person, and even if the posture is changed and the center of gravity is moved, the subsequent posture As a result, it is possible to obtain a comfortable seating feeling even if a seated person has been seated for a long time, and thus a chair that can stably maintain high work efficiency, It is intended to be provided by structure.

  In order to achieve this object, the present invention takes the following measures.

  That is, a chair according to the present invention includes a leg standing from a floor surface, a seat provided above the leg, and a support device interposed between the leg and the seat, and the support device. Is disposed below the seat, and is disposed below the seat to support the seat so that the seat can be moved along a predetermined trajectory in at least two locations in the front-rear direction. And a left and right support mechanism that is pivotally supported around one axis in the front-rear direction provided at the center position in the left and right direction when viewed from the front. Both support mechanisms move as the seat moves from a predetermined reference position. A return force generation that has a seat tilt function for tilting the front end side of the direction downward and generates a return force in a direction to return the seat moved at least in the rearward or left-right direction from the reference position to the reference position according to the amount of movement. Special equipment To.

  That is, the present inventor moves the waist, buttocks, and thighs from the reference position where the occupant himself is seated by moving the waist, buttocks, and thighs by a predetermined distance, but the seat moves horizontally in accordance with the movement of the occupant. For the first time, it is possible to increase the comfort of the seated person and to improve the work efficiency with less fatigue, by operating so that the tilting force can be obtained naturally and the swinging force to return to the reference position is obtained naturally. The present invention has been conceived by paying attention.

  Here, the “predetermined trajectory” refers to a trajectory that allows a specific position of the seat to be continuously operated on the operation surface in which the horizontal movement amount, the seat surface inclination angle, and the vertical movement amount with respect to the reference position are associated with each other. For example, the position of the center of gravity is easy to understand, but the same applies to positions other than the center of gravity. In other words, by the movement of the seat along the predetermined trajectory, the only vertical movement amount and the seating surface inclination angle respectively determined by the position of the seat in plan view are set, and the seat repeatedly continues at those positions. Will be guided.

  With such a configuration, not only can the posture of the seated person be satisfactorily maintained, but also the movement of the seated person can be favorably supported.

  Specifically, when the seat occupant moves the center of gravity backward, the seat tilts backward while moving backward, and when the seat occupant moves the center of gravity forward, the seat tilts forward while moving forward. Since it is supported so as to be movable at the two locations, it is not balanced and does not fall down, and it is not necessary to balance it by stepping on the foot.

  When the occupant moves the center of gravity to the left and right, the seat rotates about one axis in the front-rear direction provided at the center position in the left and right, so the moment that the seat tends to fall increases, but the return force to return to the reference position at the same time Since it increases, the design which balances it as a drag becomes easy.

  Moreover, as long as the center of gravity is located between the support points provided in two places in the front-rear direction, it can be operated without rattling with trajectories suitable for the front-rear direction and the left-right direction. Even if the movement of the seated person is different between the movement of the seat and the movement of the back, or the movement of the seated person is different between the front and rear and the left and right, a support state that appropriately corresponds to the movement of the seated person is realized. can do.

  In addition, since there is no need for the seated person to step on and balance, the burden on the foot is reduced, and even if the lower end of the leg is supported by the caster, there is no risk of the caster escaping. It becomes possible.

  Furthermore, with such a support device, there is no problem that the seat sinks every time the seated person sits down, and there is a problem such as when the lower end of the support is grounded to the floor and rotated. Absent.

  In addition, the seat supported by the above-mentioned front / rear support mechanism tilts forward while the seat moves forward, so that the seat tilts forward while moving forward. The lower leg of the seated person can be bent at the knee joint, and a smooth motion without the foot can be realized.

  In order to make the configuration simple while avoiding interference with peripheral mechanism parts as much as possible, it is desirable that the left and right support mechanisms are arranged separately in two front and rear positions. Compared to the case where the seat is tilted without changing the left and right position, to achieve a smooth operation that the seated person's feet cannot grip, the shaft is set to a position as low as possible, that is, a position far from the seat. It is desirable to incline while moving from side to side.

  Specifically, a configuration in which an up / down lifting mechanism or a front / rear support mechanism is disposed between two left / right support mechanisms in a front view and a side view is preferable.

  In order to return the left / right swinging part to the reference position around the axis through a simple structure, the left / right direction return mechanism uses an elastic body that uses an elastic body that accumulates elastic force as the seat moves from the reference position. A mechanism is desirable.

  In order to realize the forward return force generation with a simpler configuration, the forward return force generation mechanism has a center-of-gravity moving mechanism that raises the center of gravity of the seat as the seat moves from the reference position. It is preferable that In this case, since the return force that is generated changes according to the weight of the seated person, a return force suitable for the seated person can be obtained. That is, if the weight is light, a small restoring force can be obtained, and if the weight is heavy, a large restoring force can be obtained.

  In the case of adopting a vertical lifting mechanism for the seat, in order to configure the supporting device compactly without using a complicated structure fused with the vertical lifting mechanism, a seat is provided above the vertical lifting mechanism, and the support It is preferable that a device is interposed between the up-and-down lifting mechanism and the seat.

  Further, in order to perform the front / rear and left / right movements of the seat more smoothly, the support device is supported by independent support structures at least in the front / rear direction and the left / right direction along a predetermined trajectory. It is desirable.

  Also, in order to be able to follow the operation more appropriately by the movement of the seated person during the work, it is desirable to provide a rotation support mechanism that supports the seat so as to be rotatable in the horizontal direction with respect to the leg.

  As a specific configuration of the support device that can maintain a comfortable sitting posture of the seated person, the front-rear support mechanism and the left-right support mechanism are configured separately, and the return force generating device is moved from the rear direction to the reference position. It is desirable to have a front-rear direction return mechanism that generates a return force and a left-right direction return mechanism that generates a return force in the left-right direction that is configured separately from the front-rear direction return mechanism.

  In order to make the whole chair more compact in a plan view, it is desirable to provide the front and rear support mechanisms and the left and right support mechanisms in an overlapping manner in the plan view.

  In view of the behavior of the seated person who moves more frequently in the front-rear direction than in the left-right direction, the back tilting mechanism can be configured with a simple configuration, and the seater In order to follow the movement more naturally, the front / rear support mechanism is provided above the left / right support mechanism, positioned closer to the seated person, and swings in the front / rear direction by the front / rear support mechanism. It is desirable to attach a seat and a back to the front and rear rocking part. In this case, the fact that the front / rear support mechanism is above the left / right support mechanism is not only when referring to the structural vertical relationship, but also when referring to the master-slave of the support relationship where the supporting side is down and the supported side is up. is there.

  In order to configure the front / rear support mechanism and the left / right support mechanism through a simple configuration, the front / rear support mechanism is provided below the left / right support mechanism, and the seat is mounted on the left / right swinging portion that swings left / right by the left / right support mechanism. It is desirable to keep the back attached. In this case as well, when the front-rear support mechanism is lower than the left-right support mechanism, in addition to the structural vertical relationship, it also means the master-slave of the support relationship where the supporting side is down and the supported side is up There is.

  In order to configure a front / rear support mechanism that can perform an accurate and stable operation, the front / rear support mechanism includes a guide surface formed along a predetermined locus and a follower that performs a relative operation following the guide surface. It is preferable to make it.

  And in order not to give unnecessary “fear” or uncomfortable feeling to the seated person due to the sudden movement of the seat, the front and rear support mechanism is slowed down so that the movement of the follower becomes slow as it approaches the movement end of the follower. It is desirable to have a part.

  In addition, to prevent unnecessary impacts and noise caused by the sudden movement of the seat from being applied to the seated person, the front / rear support mechanism avoids the impact caused by the collision between the end of the guide surface and the follower at the operating end. Or it is desirable to have a shockless part to absorb.

  In order to realize a smooth operation according to the movement of the seated person, it is preferable that the front-rear support mechanism has a link member whose operation end can move along a predetermined locus.

  In order to realize ease of movement of the chair, it is desirable that the leg has a caster that is capable of rolling on the floor surface.

  In order to maintain an appropriate relationship between the back and the seat when the vehicle is tilted backward, the spine can be tilted backward relative to the front / rear support mechanism of the seat or the front / rear swinging portion that swings back and forth by the front / rear support mechanism. It is desirable to be attached to the seat and interlock with the movement of the seat.

  In order to achieve a sufficient tilt angle on the back without extreme back tilt of the seat, the back and the seat can be tilted back via an interlocking mechanism, and the back tilt angle of the seat It is desirable that the back tilt angle range of the back is larger than the range.

  In order to prevent a sudden tilt of the back and to properly return the back seat to the reference position, it is desirable that the seat moves backward while the center of gravity rises when the back tilts backward from the reference position.

  When attaching an elbow to a chair equipped with a front / rear swinging part that swings back and forth by the front / rear support mechanism and a left / right swinging part that swings left and right by the left / right support mechanism, In order to avoid giving, the elbow is attached to the support base disposed on the upper end portion of the leg when the front / rear swing part is supported by the left / right swing part, and the left / right swing part is supported by the front / rear swing part. It is desirable that the elbow is attached to the support base or the front / rear swinging part.

  When the seat is supported not only by moving backward from the reference position but also by the front and rear support mechanism so as to move forward, the return force generator returns the seat moved forward to the reference position. It is desirable to generate a direction return force according to the amount of movement.

  Since the present invention has the configuration described above, it is possible to provide a chair with a simple configuration that can provide a comfortable seating feeling even when a seated person has been sitting for a long time, and that can stably maintain high work efficiency. can do.

The perspective view of the chair which concerns on 1st embodiment of this invention. The exploded perspective view. The principal part expansion perspective view of FIG. The front view which abbreviate | omitted a part of the chair. Operation | movement explanatory drawing corresponding to FIG. The right view of the chair. FIG. 7 is an operation explanatory view partially omitted corresponding to FIG. 6. Operation | movement explanatory drawing corresponding to FIG. The front view which fractured | ruptured the chair partially. Operation | movement explanatory drawing corresponding to FIG. Explanatory drawing explaining the use condition of the chair. Explanatory drawing corresponding to FIG. The perspective view which abbreviate | omitted some chairs concerning 2nd embodiment of this invention. The right side view. The front view. Operation | movement explanatory drawing corresponding to FIG. The side view of the chair which concerns on 3rd embodiment of this invention. Operation | movement explanatory drawing corresponding to FIG. Operation | movement explanatory drawing corresponding to FIG. 17 and FIG. The figure for demonstrating the operation | movement of the chair mechanically. The perspective view which abbreviate | omits and shows a part seeing through the chair which concerns on 4th embodiment of this invention. The side view of the chair. Operation | movement explanatory drawing corresponding to FIG. The figure which shows the comparative example 1 of this invention. The figure which shows the comparative example 2 of this invention.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings.

  <First embodiment>

  The chair according to the first embodiment of the present invention is referred to as an office rotary chair that can be suitably used in an office or home.

  As shown in FIGS. 1 to 8, the chair includes a leg 1 erected from the floor, a seat 3 provided above the leg 1, and a back formed integrally with the seat 3. 4 mainly.

  The leg 1 has leg wings 11 formed radially in plan view, casters 12 attached to the lower side of the leg wings 11 so as to roll on the floor surface, and legs erected from the center of the leg wings 11. The rod 13 of the gas spring 14 is made to be relative to the leg column 13 in the vicinity of the column 13, the gas spring 14 that is built in the leg column 13 and supports the seat 3 so that the seat 3 can be moved up and down, and the upper end of the leg column 13. It has a rotation support mechanism 16 that supports the seat 3 so that it can rotate horizontally. By pushing a push button 17 provided at the upper end of the gas spring 14 with an operation lever 17a, the gas spring 14 can be expanded and contracted to adjust the vertical position of the seat 3.

  The seat 3 is mainly composed of a plate-like seat body 30 formed integrally with the back 4 in the present embodiment, and the lower surface side is attached to a seat receiver 22t described later while the upper surface of the seat body 30 is a seat surface 3a. It is done.

  Here, in the chair according to the present embodiment, the support device 2 interposed between the leg 1 and the seat 3 is arranged below the seat 3, and at least two places in the front-rear direction and one axis m extending in the front-rear direction. The seat 3 is movably supported along a predetermined locus. Further, the seat 3 is provided with a seat tilting mechanism Q that functions as a seat tilting function for tilting the front end side of the seat 3 in the downward direction as the seat 3 moves, and from the reference position S of the seat 3 shown in FIGS. 6 and 9. Is further provided with a return force generator P (P1, P2) that generates a return force in a direction to return the seat 3 moved in the front-rear direction shown in FIG. 10 or the left-right direction shown in FIG.

  The support device 2 is configured between the support base 10 disposed on the upper end portion of the leg 1 and the lower surface of the seat 3. Specifically, the left and right rocking portion 21 and the front and rear rocking portion 22 interposed between the support base 10 and the seat 3 and the support base 10 and the left and right rocking portion 21 are configured so that the seat 3 extends in the left and right direction. A pair of left and right support mechanisms 23 (F, F) that are configured between a pair of left and right support mechanisms 23 and a seat 3 and a left and right swinging portion 21 to support the seat 3 in a front and rear direction. R). That is, the left and right support mechanisms 23 and the front / rear support mechanism 24 are overlapped at a position overlapping in plan view, and are configured separately from each other. In this embodiment, since the front / rear support mechanism 24 is positioned on the left / right support mechanism 23, the seat 3 and the back 4 are attached to the front / rear swing part 22 that swings back and forth by the front / rear support mechanism 24. Yes. That is, the back and forth swinging portion 22 has a seat receiver 22t attached between the upper ends of the left and right side walls 22s, and the lower surface of the seat 3 is attached to the seat receiver 22t. Of course, when the left and right support mechanism is positioned on the front and rear support mechanism as in other embodiments described later, the seat and the back are attached to the left and right swinging portions that swing left and right by the left and right support mechanisms. Good.

  The left-right support mechanism 23 is for supporting the seat 3 so as to be tiltable in the left-right direction as shown in FIGS. 4 and 5, and as shown in FIGS. The projecting portion 21a projecting in the half area and the front and rear walls 10a of the support base 10 are provided in the left and right directions by using the shaft member V10 which is the shaft member constituting the shaft m in the front and rear direction. It is configured by connecting at the center position. As described above, the left and right support mechanism 23 is divided into two front and rear portions, and the upper end portion of the gas spring 14 that is the vertical lift mechanism is inserted into the space between the support base portion 10. That is, the gas spring 14 which is an up-and-down lifting mechanism is disposed between the left and right support mechanisms 23 and 23 at the front and rear positions in a side view.

  The front / rear support mechanism 24 supports the seat 3 so that the seat 3 can be inclined about 8 ° forward and about 10 ° rearward as shown in FIGS. 6 to 8. The front support portion 24 supports the front portion of the seat 3. (F) and a rear support portion 24 (R) that supports the rear portion of the seat 3.

  The front support portion 24 (F) includes a follower 21 c attached to the left and right swinging portion 21 and guide holes 22 a formed in the left and right standing walls 22 s of the front and rear swinging portion 22. The guide hole 22 a and the follower 21 c are relatively Configured to move. The follower 21c employs a bearing in this embodiment. A surface in contact with the follower 21c in the guide hole 22a is a guide surface. The guide surface has an upward chevron shape so as to follow a predetermined locus set in advance. The guide surface is not necessarily closed like a hole, but may be a hole that does not penetrate.

  On the other hand, the rear support part 24 (R) is constituted by a rear link 24 a for suspending and supporting the left-right swing part 22 on the front-rear swing part 21. The rear link 24 a has an upper suspension shaft 24 b for pivotally attaching the upper end portion to the rear portion of the left and right swing portion 21, and a lower swing portion for pivotally attaching the lower end portion to the rear portion of the front and rear swing portion 22. A shaft 24c is provided. The rear link 24a that can swing at the reference position S of the seat 3 shown in FIG. 6 is slidable by receiving the weight of the upper portion of the chair such as the seat 3 and the back 4 to which the lower swing shaft 24c is connected. The follower 21c is in an appropriate floating position in the guide hole 22a and is supported by the front support portion 24 (F) and the rear support portion 24 (R), and the center of gravity Om of the movable portion including the seat 3 and the back 4 is provided. Is the lowest position.

  Therefore, regardless of whether the seat 3 or the like moves from the state of FIG. 6 in the direction of FIG. 7 or in the direction of FIG. 8, the center of gravity positions Of and Ob become higher than the center of gravity position Om at the reference position S. It becomes the opposite action. That is, when the seat 3 is operated, a return force due to gravity in the direction of returning to the reference position S is naturally applied. That is, in the present embodiment, the follower 21c, the guide hole 22a, and the rear link 24a generate a return force that generates a return force that returns in the forward direction from the position of the return force generating device P to the reference position. And a front-rear direction return mechanism P1 that also serves as a rearward return mechanism that generates a return force that returns backward from the position moved in the forward direction toward the reference position, and is used for the operation of the seat 3 from the reference position (S). This is realized by a center of gravity moving mechanism that raises the center of gravity G of the seat 3. In addition, the seat surface 3a that moves back and forth in FIG. This is due to the posture of the rear link 24a and the shape of the guide hole 22a that moves relative to the follower 21c on the front side of the rear link 24a. That is, in this embodiment, the follower 21c, the guide hole 22a, and the rear link 24a play the role of the seat inclination mechanism Q.

  In the present embodiment, the upward chevron shape of the guide hole 22a is defined as a first region 22a1 that includes a reference position S as shown in FIG. In the first region 22a1, the height of the seat 3 is cooperated with the rear link 24a via the follower 21c even if the seat 3 and the back 4 move back and forth from the reference position S in the first region 22a1. When the seat 3 is guided in a direction away from the reference position S while suppressing the movement of the center of gravity in the direction to a small extent (therefore, the return force to the reference position S is kept small), and enters the second region 22a2 shown in FIGS. A direction in which the seat 3 is moved away from the reference position S while increasing the center of gravity movement in the height direction of the seat 3 in cooperation with the rear link 24a via the follower 21c (thus increasing the return force to the reference position S). To guide It is set to. That is, in this embodiment, as the follower 21c is driven from the first region 22a1 to the second region 22a2, the ease of movement of the seat 3 is gradually decreased by increasing the return force, thereby reducing the speed. Part. In other words, the slow part is a portion extending from the boundary position between the first region 22a1 and the second region 22a2 to the second region 22a2. Since the first region 22a1 and the second region 22a2 are continuous, it is difficult to clearly indicate the boundary position, but the position where the center of gravity movement rate in the height direction of the seat 3 switches from low to high can be regarded as the boundary position. it can.

  Even if viewed from the locus of center of gravity movement, if the center of gravity follows the locus indicated by the broken line in the lower diagram of FIG. 7, it is difficult to move because the center of gravity movement is large at first, and the center of gravity movement becomes small and easy to move from the middle. However, in this embodiment, it is configured to follow the locus indicated by the solid line in the figure, and the movement of the center of gravity is initially small and the movement of the center of gravity increases from the middle. Therefore, a sense of security of the seated person can be obtained in the vicinity of the moving end. The same applies to the lower diagram of FIG.

  In the present embodiment, the front follower 21c is guided to the end surface of the front and rear guide holes 22a by guiding the seat 3 so as to be lifted sharply while maintaining the inclination angle of the seat 3 substantially constant at the front and rear operating ends of the guide hole 22a. The shockless part R which prevents the impact which arises by contacting is comprised. As a result, the operating energy at the operating end is converted into potential energy, and collision between the front follower 21c and the end face of the guide hole 22a is avoided.

  Instead of constituting the shockless portion R, an elastic member such as rubber may be added to absorb the impact caused by contact.

  The rear support 24R may be configured with a guide hole and a follower together with the front support 24F, and the front support 24F may be configured with a link together with the rear support 24R.

  That is, in the present embodiment, the operating distance of the seat 3 that freely moves in the front-rear and left-right directions is set so that the distance in the front-rear direction shown in FIGS. 6 to 8 is larger than the distance in the left-right direction shown in FIGS. doing. More specifically, the operation angle in the front-rear direction of the seat 3 is set so that the rear direction shown in FIG. 8 is larger than the front direction angle shown in FIG.

  Thereby, the movement of the seat surface 3a in the front-rear and left-right directions is configured to follow a predetermined locus set in advance. In this embodiment, the predetermined trajectory is formed along an operating range in which the seat 3 can tilt forward 8 ° and backward 10 ° with the reference position S as the center.

  On the other hand, as shown in FIG. 2 and FIG. 9, the left / right direction return mechanism P2 for returning the seat 3 moved in the left / right direction from the reference position S in the return force generator P to the reference position S is a pair of elastic bodies, An elastic body return mechanism using coil springs 25 and 25 is used. Specifically, the support base 10 has a box-like shape opened upward, and coil springs 25 and 25 are internally housed in a compressed state in series along the expansion / contraction direction between the side walls 10c and 10c of the support base 10, A pair of retainers 25R, 25R are interposed between the coil springs 25, 25 in a state of being connected to the connecting portion 25c. On the other hand, a pressing portion 21x protrudes inward from the left / right swinging portion 21 and is inserted between the retainers 25R and 25R. That is, the coil springs 25 and 25 are arranged in a compressed state so that one end in the expansion / contraction direction comes into contact with the side wall 10c of the support base 10 and the other end comes into contact with the retainer 25R. The left and right coil springs 25, 25 are configured to be compressed equally when the left / right swinging portion 21 is at the reference position S.

  FIG. 10 shows the behavior of the seat 3 when it moves leftward from a predetermined reference position S where the elastic forces of the left and right coil springs 25, 25 antagonize. As shown in FIG. 10, when the seated person moves the center of gravity to the left and right, the seat 3 is moved to the left by the left and right support mechanism 23, and the elastic force in the return direction is accumulated in the left coil spring 25. At this time, since the seat 3 rotates about the axis m of the left and right support mechanism 23, the moment at which the seat 3 tends to fall increases, but the elastic force of the coil spring 25 accumulated against the moment is the drag force. It is configured to be suspended. That is, in the present embodiment, the left and right coil springs 25, 25 constitute a left / right direction return mechanism P2 that generates a left / right return force of the return force generating mechanism. Moreover, since the operation | movement front end side descend | falls with rotation, in this embodiment, the right-and-left support mechanism 23 also plays the role of the seat inclination mechanism Q. Further, since the longitudinal axis m serving as the rotation fulcrum is located far from the seat 3, the seat 3 tilts while proceeding to the left, so that the foot is tilted as compared with the case where the left and right positions of the seat 3 are tilted unchanged. Smooth operation that can not be used can be realized. The same applies when operating in the right direction from the predetermined reference position S.

  7 and 8, when the seat 3 is at a predetermined reference position (S) set by the guide hole 22a, the follower 21c, and the rear link 24a that form the guide surface, and forward from this reference position (S). The behavior of the seat 3 when operated in the direction or the backward direction is shown. As shown in the figure, when the seat surface 3a is moved back and forth by the front and rear support mechanism 24, the seat 3 located between the front and rear support points, that is, the position of the follower 21c, and the support point of the rear link 24a, that is, the lower swing shaft 24c. Guide hole 22a so that the center of gravity position Of when moving forward from the center of gravity Om when the center of gravity is at the reference position (S) and the center of gravity Ob when moving backward are slightly raised. The position and shape of the rear link 24a and the length and angle of the rear link 24a are adjusted. In addition, the position and shape of the guide surface 22a and the length and angle of the link are adjusted so that the seat surface 3a that has moved back and forth in FIG. As a result, the operation tip side is inclined downward. That is, in this embodiment, the guide hole 22a, the follower 21c, and the link 25b also serve as the seat tilting mechanism Q.

  Next, in FIG. 11 and FIG. 12, the behavior of the seated person, particularly the lower body, when the seat 3 is tilted forward will be described. When a normal occupant tilts the chair forward (or backwards) when seated, as shown in the figure, the knee NE, the ankle AN, and the vicinity of the buttocks HP, especially the ankle AN, tries to move as a main pivot. However, in the conventional chair, when the seat 3 tilts forward, the front and rear positions are not substantially changed, so the angle of the lower leg (NE-AN) also remains vertical, and the knee NE is held between the seat 3 and the ground. Because the angle cannot be lowered, the forward leaning posture could not be taken smoothly.

  Therefore, the chair according to the present embodiment is configured to move forward while the seat 3 moves forward when the seat 3 is tilted forward as shown in the figure, so that the leg of the seated person is bent at the ankle AN and knee NE. The knee NE is lowered and the forward leaning posture can be taken smoothly without the lower leg being grasped between the seat and the ground.

  In attaching the elbow N shown in FIG. 5, the elbow N is attached to and fixed to the support base 10 in view of the fact that the front / rear swinging portion 22 is supported by the left / right swinging portion 21.

  As described above, the chair according to the present embodiment includes the leg 1 erected from the floor, the seat 3 provided above the leg 1, and the support device 2 interposed between the leg 1 and the seat 3. The support device 2 is disposed below the seat 3, and is disposed below the seat 3, and a front / rear support mechanism 24 that supports the seat 3 movably along a predetermined locus in at least two locations in the front-rear direction. And a left and right support mechanism 23 that supports the seat 3 so as to be rotatable about one axis m in the front-rear direction provided at the center position in the left and right directions at least in the left and right direction, and both of the support mechanisms 24 and 23 are provided. As the seat 3 moves from the predetermined reference position S, the seat 3 is provided with a seat tilt function for tilting the front end side in the moving direction of the seat 3 downward, and the seat 3 moved from the reference position S in the rearward or left-right direction to the reference position S. A return force generator P that generates a return force in the return direction according to the amount of movement Characterized by comprising the al.

  With such a configuration, not only can the posture of the seated person be satisfactorily maintained, but also the movement of the seated person can be favorably supported.

  Specifically, when the seat occupant moves the center of gravity backward, the seat 3 tilts backward while moving backward, and when the seat occupant moves the center of gravity forward, the seat 3 tilts forward while moving forward, Since it is supported so as to be movable in two places in the front-rear direction, it is not balanced and does not fall down, and there is no need to straddle it with your feet.

  When the seat occupant moves the center of gravity to the left and right, the seat 3 rotates about one axis m in the front-rear direction provided at the center position in the left and right. Since the return force to be returned also increases at the same time, it becomes easy to design the balance as a drag force.

  Moreover, as long as the center of gravity is located between the support points provided in two places in the front-rear direction, the seat 3 can be operated without rattling with a trajectory suitable for the front-rear direction and the left-right direction. Even if the movement of the seated person is different between the movement to the back and the movement of the back, or the movement of the seated person is different between the movement to the front and back and the movement to the left and right, it is appropriate for the movement of the seated person It is possible to realize a support state corresponding to.

  Further, since it is not necessary for the seated person to step on the foot and balance, the burden on the foot is reduced, and even if the lower end of the leg 1 is supported by the caster 12, the caster 12 is not likely to escape, so that the chair is stable. Can be used.

  Furthermore, such a support device 2 does not cause a problem that the seat and the leg sink each time a seated person sits down, and has a problem such as the case where the lower end of the support is grounded to the floor and rotated. It is not accompanied.

  In addition, the seat 3 supported by the front / rear support mechanism 24 tilts forward while the seat 3 moves forward, so that the seat 3 tilts forward while moving forward, so that the front / rear position of the seat 3 remains unchanged. Compared to the case, the lower leg of the seated person can be bent at the knee joint, and a smooth motion without the foot can be realized.

  As described above, the seat 3 moves in the tilted direction when the seating surface 3a is tilted, so that it fits very well to the movement of the seated person's body, and tends to move due to the structure of the seated person's body when seated. Based on the above, it is possible to configure a chair that can favorably support the operation. As a result, according to the present embodiment, a comfortable seating feeling can be obtained even if a seated person has been seated for a long time, and as a result, a chair that can stably maintain high work efficiency can be provided.

  Further, as the seat 3 moves, a return force that tries to return the seat 3 to the reference position S works, so that the seated person can obtain a smooth and comfortable feeling while sitting on the rocking chair.

  In the above, since the left and right support mechanism 23 is divided and arranged in two front and rear positions, it achieves a simple configuration while avoiding interference with peripheral mechanism parts such as the gas spring 14 constituting the elevating mechanism 13 as much as possible, The axis m can be set to a position as low as possible, that is, a position far from the seat 3, and the seat 3 tilts while moving left and right. Realizes smooth operation that can't be used.

  Further, since the left-right return mechanism P2 is an elastic body return mechanism using a coil spring 25 that is an elastic body that accumulates elastic force with the movement of the seat 3 from the reference position S, the return according to the amount of movement is achieved through a simple structure. While accumulating force, the seat 3 can be returned to the reference position S while the left and right swinging portion 21 is swung smoothly around the axis m.

  In addition, since the front-rear direction return mechanism P1 that generates a forward return force is realized by a center-of-gravity moving mechanism that raises the center of gravity of the seat 3 with the operation of the seat 3 from the reference position S, the front-rear direction return force The generation mechanism can be realized with a simpler configuration. In this case, the return force that is generated changes in accordance with the weight of the seated person, so that a return force suitable for the seated person can be obtained. That is, a weight sensing function is provided in which a small return force is obtained when the weight is light, and a large return force is obtained when the weight is heavy. In this embodiment, the same applies to the case where the front-rear direction return mechanism P1 generates a backward return force when the seat 3 moved forward from the reference position S is returned to the reference position S.

  Further, in this embodiment, the gas spring 14 is employed as the vertical lifting mechanism of the seat 3, but the seat 3 is provided above the gas spring 14, and the support device 2 is interposed between the gas spring 14 and the seat 3. Since it is interposed, the supporting device can be made compact without a complicated structure fused with the gas spring 14.

  Further, since the support device 2 supports the seat 3 so as to be independently operable in at least the front-rear direction and the left-right direction along a predetermined locus, the front-rear and left-right movements of the seat 3 are more smoothly and appropriately performed. To be able to do that.

  In addition, the movement distance of the seat 3 is set so that the rearward direction is larger than the left-right direction, or the rearward tilt direction is larger than the forward tilt direction. 3 movements can be made to correspond appropriately.

  Here, the operating distance refers to the maximum moving distance within the operating range. The same applies hereinafter.

  Further, since the rotation support mechanism 16 that supports the leg 3 so as to be rotatable in the horizontal direction with respect to the leg 1 is provided, it is possible to suitably follow the movement of the seated person during the work.

  Further, the front / rear support mechanism 24 and the left / right support mechanism 23 are configured separately, and the return force generating device P generates a return force from the front / rear direction to the reference position S as well as from the rear direction to the reference position S. Since the front-rear direction return mechanism P1 and the left-right direction return mechanism P2 that generates a return force in the left-right direction that is configured separately from the front-rear direction return mechanism P1 are provided, a comfortable seating posture of the seated person is maintained. The supporting device 2 can be specifically realized.

  Moreover, since the front-rear support mechanism 24 and the left-right support mechanism 23 are provided so as to overlap each other in a plan view, the entire chair can be configured more compactly in a plan view.

  Further, in view of the behavior of a seated person who moves more and more in the front-rear direction than in the left-right direction and takes frequent actions, the front-rear support mechanism 23 is provided above the left-right support mechanism 24 to make the seater more Since the seat 3 and the back 4 are attached to the front and rear swinging portion 22 that is positioned near and swings in the front and rear direction by the front and rear support mechanism 23, the back tilting mechanism can be configured with a simple configuration, and thus It can be made to follow a seated person's movement more naturally. In this case, the front-rear support mechanism 24 being above the left-right support mechanism 23 means the master-slave of the support relationship in which the supporting side is down and the supported side is up, in addition to the structural vertical relationship. There is a case.

  Further, the front and rear support mechanism 22 includes a guide hole 22a in which a guide surface is formed along a predetermined locus, and a follower 21c that performs a relative operation following the guide surface of the guide hole 22a. The front-rear support mechanism 22 that can operate accurately and stably can be configured.

  Further, since the front / rear support mechanism 24 has a slow portion that slows down the operation of the follower 21c as it comes close to the operation end of the follower 21c, a sudden movement of the seat 3 causes unnecessary “fear” ”Or discomfort can be prevented.

  Further, the end R of the slack portion of the front / rear support mechanism 24 also functions as a shockless portion that avoids or absorbs an impact caused by a collision between the end of the guide surface of the guide hole 22a and the follower 21c at the operating end. It is possible to prevent the seated person from being subjected to unnecessary impacts and noises caused by the sudden movement of the seat.

  Further, since the front / rear support mechanism 24 has the rear link 24a which is a link member whose operating end can move along a predetermined locus, it is possible to realize a smooth operation according to the movement of the seated person. .

  Moreover, since the leg 1 has the caster 12 which grounds on a floor surface so that rolling is possible, the ease of movement of a chair is realizable. In other words, if the element that grips the floor surface due to frictional force when seated is grounded as in Japanese Patent Publication No. 10-513374, there is a problem that it cannot move while sitting. However, in this embodiment, even when the seat 3 is tilted at the time of sitting, it is difficult to apply a horizontal force to the caster 12, so that it is not necessary to separately generate a frictional force against the floor surface. As a result, the seated person can move while sitting when required.

Further, when the elbow N is attached, the elbow N is attached and fixed to the support base N in view of the fact that the front / rear oscillating portion 22 is supported by the left / right oscillating portion 23. It can avoid giving anxiety to the seated person by shaking.
<Second embodiment>

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  This chair also includes a leg 101 erected from the floor, a seat 103 provided above the leg 101, and a support device 102 interposed between the leg 101 and the seat 103. A front / rear support mechanism 124 (F, R) that is disposed below the seat 103 and supports the seat 103 so as to be movable along a predetermined trajectory at least at two locations in the front-rear direction, and disposed below the seat 103. And a left and right support mechanism 123 that supports the shaft about a single axis m2 in the front-rear direction provided at the center in the left-right direction when viewed from the front in the left-right direction. As shown in FIGS. 13 and 14, there is provided a seat tilting mechanism Q2 that is a seat tilting function that tilts the front end side of the seat 103 in the moving direction downward as it moves from the predetermined reference position S2, and from the reference position S2 in the front-rear direction or Further comprising a return force generating device P'that generates in response a return force in a direction for returning the seat 103 moves in the left-right direction to the reference position S2 to the movement amount.

  Among the front and rear support mechanisms 124, the front support portion 124 (F) is an engagement structure of the guide hole 122a forming the guide surface and the follower 121c, and the rear support portion 124 (R) uses the rear link 124a. Point, the left-right direction return mechanism P102 constituting the return force generator P ′ is an elastic body return mechanism that accumulates elastic force in the elastic body 125 such as a coil spring or urethane, and the front-rear direction that generates a return force in the front-rear direction The return mechanism P101 is the same as in the first embodiment in that the return mechanism P101 is a center of gravity moving mechanism that raises the center of gravity of the seat 103 from Om to Of and Ob as shown in FIG. 14 as the seat 103 moves from the reference position S2. It is.

  However, in this embodiment, the front / rear support mechanism 124 is provided below the left / right support mechanism 123, and the seat 103 integrated with the back 104 is attached to the left / right swinging part 121 that swings left / right by the left / right support mechanism 123. It has been.

  Specifically, the front / rear swing part 122 is attached to the support base 110 via the front / rear support mechanism 124, and the left / right swing part 121 is attached to the front / rear swing part 122 via the left / right support mechanism 123. The follower 121c constituting the front support portion 124 (F) of the front / rear support mechanism 124 is attached to the support base 110, and the guide surface of the guide hole 122a provided in the front / rear swing portion 122 is in contact with the follower 121c. Further, the upper suspension shaft 124b of the rear link 124a constituting the rear support portion 124 (R) is attached to the support base 110, and the lower swing shaft 124c suspends and supports the front / rear swing portion 122.

  On the other hand, the left and right support mechanism 123 includes a pair of front and rear brackets 123a and 123a protruding upward from the front and rear swinging portion 122, and the front and rear wall portions 123c and 123c via shaft members 123b that constitute the shaft m2 on these brackets 123a. It is composed of a movable seat receiver 123d that is pivotally supported, and the shaft member 123b is not separated and is constituted by one piece continuously between the brackets 123a and 123a, and the lower surface of the seat 103 is attached to the movable seat receiver 123d. Yes.

  That is, the shaft member 123b constituting the shaft m2 of the left and right support mechanism 123 is at a height position closer to the seat 103 than in the above embodiment, and the horizontal movement amount of the seat 103 is small even at the same rotation angle. In other words, the tilt angle of the seat 103 in the left-right direction changes greatly with a slight movement. For this reason, the seating feeling when swinging in the left-right direction is different from that of the first embodiment, and is another form adopted according to the purpose and application.

  In this embodiment, the elastic body 125 is connected to the bracket 123 at one end in the expansion / contraction direction at the illustrated position displaced rightward from the shaft member 123b constituting the longitudinal axis m2 and at the unillustrated position displaced leftward. The other end is abutted against the movable seat receiver 123d of the left and right swinging part 121, with the plate part 123a forming an integral part.

  Therefore, when there is no seated person or when the seated person is seated at an equal left and right position, the repulsive force of the elastic body 125 is suspended and the seat 103 is held at the reference position, and the seat 103 tilts in either the left or right direction. Then, the elastic body 125 on the side where the position of the seat 103 is lowered is compressed while accumulating the elastic force, thereby increasing the return force to the reference position.

  Even if it does in this way, the chair which shakes back and forth and right and left although it is a simple structure can be provided.

  As described above, a simple configuration can be obtained by providing the front / rear support mechanism 124 below the left / right support mechanism 123 and attaching the seat 103 and the back 104 to the left / right swinging portion 121 swinging left / right by the left / right support mechanism 123. Thus, the front / rear support mechanism 124 and the left / right support mechanism 123 can be configured. Also in this case, the fact that the front / rear support mechanism 124 is lower than the left / right support mechanism 123 is not only in the case of a structural vertical relationship, but also in a support relationship with the support side down and the support side up. May say. And if the shaft m2 is configured to be long and long, the shaft m2 can be configured with a small diameter, so that there is an advantage that it can be compactly incorporated in the mechanical component.

In attaching the elbow N, the elbow N is attached to the front / rear swinging part 122 as shown in the drawing or the support base 110 in view of the fact that the left / right swinging part 121 is supported by the front / rear swinging part 122. Attached to. For this reason, the elbow N swings or is fixed only forward and backward, does not swing left and right, and can give the seated person a sense of security.
<Third embodiment>

  Hereinafter, a third embodiment of the present invention will be described with reference to FIGS.

  The structure in which the seat swings back and forth as in the above embodiment is excellent in that it can be tilted forward only by moving the center of gravity without requiring any special operation, but when the back and seat are integrated, the amount that can be tilted backward is Limited. That is, if the amount of backward tilting is increased forcibly, the backward tilting of the seat also increases, so that the back of the thighs is pressed or the legs are lifted, which impairs the sitting comfort. Therefore, the back seat is separated, and a synchro-rocking structure in which the back moves with respect to the seat in conjunction with the motion of the seat so as to increase the sandwiching angle of the back seat as the seat moves backward is used together.

  In this case, the back and seat may be operated in conjunction so that the back angle of the back seat simply increases as the seat moves backward, but in that case, the back angle of the back seat decreases as the seat moves forward. . Then, when it leans forward, the back muscles cannot be extended sufficiently, or pressure is applied from the upper end of the back.

  Therefore, the back seat is separated, and the back is tilted back and forth in conjunction with the back and forth movement of the seat. During the operation, `` the back angle of the back seat does not change even if there is back and forth movement of the seat A process was set up so that the angle between the back and front of the seat increased as the seat moved backward or forward.

  This will be specifically described below. Since the basic structure of the chair shown in FIGS. 17 to 19 is the same as that of the chair of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. Of these, the back seat is provided separately from the back 204 and the seat 203 instead of being integrated, and the seat 203 is attached so as to be swingable back and forth and left and right as in the first embodiment. 21, follower 21 c, front / rear swing part 22, guide hole 22 a, left / right support mechanism 23, front / rear support mechanism 24, rear link 24 a, lower swing shaft 24 c (C), front support part 24 (F), rear support part 24 (R), a return force generator P, a front-rear direction return force generation mechanism P1, a left-right direction return force generation mechanism P2, an axis m, and the like.

  The back 204 is attached so as to be relatively tiltable with respect to the front / rear swinging portion 22 of the seat 203 or the front / rear support mechanism 24 of the seat 3, and is configured to interlock with the operation of the seat 203 via the interlocking mechanism 200. Is done. At that time, the back tilt angle range of the back 204 is set to be larger than the back tilt angle range of the seat 203, and the center of gravity of the seat 103 rises when the seat 203 tilts forward or backward from the reference position S. It is configured to move in the front-rear direction.

  Hereinafter, the interlocking mechanism 200 will be described.

  The interlocking mechanism 200 is pivoted at a position slightly above the lower end of the back frame 204a to the side wall 22s of the front / rear swinging portion 22 via a pivot point A, and an upper pivot point A that pivots the rear link 24a. And an intermediate pivot point D set between the lower pivot point C and the pivot point E set at the lower end of the back frame 204a are connected by an intermediate link 200a.

  Here, as seen from the inertial system that moves together with the front / rear swinging portion 22, the fixed link L1 is between the pivot points A, the drive link L2 is between the pivot points C, and the driven point L is driven between the pivot points A and E. An intermediate link L4 is defined between the link L3 and the pivot point D-E. The drive link L2 rotates clockwise or counterclockwise with the pivot point C as a fulcrum with respect to the fixed link L1, thereby driving the pivot point D of the intermediate link L4, whereby the intermediate link L4 is pivoted. Acts on E to drive the driven link L3. That is, when the seat 203 tilts backward from the reference position S shown in FIG. 19 as shown in FIG. 19, the drive link L2 rotates counterclockwise with the pivot point C as a fulcrum, so that the drive link L2 and the intermediate link L4 are sandwiched. The angle θ is gradually narrowed, whereby the pivot point E is drawn to the pivot point C, the driven link L3 is rotated clockwise around the pivot point A, and the back 204 is further tilted backward with respect to the seat 203. . On the other hand, when the seat 203 is tilted forward from the reference position S shown in FIG. 17 as shown in FIG. 18, the drive link L2 rotates clockwise with the pivot point C as a fulcrum, so that the drive link L2 and the intermediate link L4 are sandwiched. As the angle θ gradually increases, the pivot point E is protruded from the pivot point C, the follower link L3 is rotated counterclockwise around the pivot point A, and the back 204 is tilted forward with respect to the seat 203. Let However, when the drive link L2 and the intermediate link L4 exceed the straight line shown in FIG. 20, the pivot point E is again drawn to the pivot point C, and the driven link L3 is pivoted clockwise with the pivot point A as a fulcrum. The back 204 is tilted backward with respect to the seat 203 by rotating.

  In this way, by using a state in which the links L2 and L4 are in a straight line with the four-node link, it is possible to realize an operation in which the spine 204 does not fall forward from the vertical.

  As described above, the spine 204 is attached to the back and forth swinging portion 22 of the seat 203 or the back-and-forth support mechanism 24 of the seat 203 so as to be able to tilt backward, and is configured to interlock with the operation of the seat 203. Therefore, an appropriate relationship between the back 204 and the seat 203 can be maintained when tilting backward.

  Further, the back 204 and the seat 203 can be tilted backward via the interlocking mechanism 200, and the back tilt angle range of the back 204 is set to be larger than the back tilt angle range of the seat 203. Without involving the extreme rearward tilt of 203, a sufficient tilt angle can be realized in the back 204, and the back of the thighs is not pressed and the legs are lifted, so that the sitting comfort is not impaired.

  Further, when the seat 203 tilts backward from the reference position S, the seat 203 moves backward with the center of gravity rising, and when the seat 203 tilts forward from the reference position S, the seat 203 moves forward with the center of gravity rising. Therefore, it is possible to prevent the back 204 from abruptly tilting and appropriately return the back seat to the reference position S.

  Further, in view of the fact that the seat 203 is configured not only to move backward from the reference position S but also to move forward, the restoring force generator P also moves when the seat 203 moves forward. Since the return force in the direction to return the position to the reference position is generated according to the amount of movement, it is possible to appropriately ensure the feeling of use when leaning forward and the flight at the time of seating.

  In addition, the back 204 and the seat 203 are separated so that the back 204 tilts back and forth with respect to the seat 203 in conjunction with the back-and-forth movement of the seat 203. Has a process in which the seat 203 does not tilt with respect to the seat 203, and the angle between the back 204 and the seat 203 increases as the seat 203 moves backward or forward from the process. This prevents the back muscles from being stretched when the seat is tilted forward and does not receive pressure from the upper end of the back.

  As described above, this embodiment can also provide a chair that swings back and forth and left and right while having a simple structure.

Note that such a chair that combines a structure in which the seat swings to the left and right and a structure in which the back seat is synchronized with the back seat can be realized even if the left-right support mechanism does not have a structure around one axis in the front-rear direction, as in a comparative example described later. However, it is effective to simply configure the left and right support mechanisms as the number of mechanism parts for synchro-rocking the back seat increases.
<Fourth embodiment>

  Hereinafter, 4th embodiment of this invention is described based on FIGS. 21-23.

  In this embodiment, a chair provided with a general synchro-rocking function is combined with a left-right swinging motion of a seat around one axis. This chair is configured such that the back 304 performs a backward tilting operation from the reference position S3 of the seat 303, and includes a leg 301 standing from the floor surface, a seat 303 provided above the leg 301, A support device 302 interposed between the leg 301 and the seat 303. The support device 302 is disposed below the seat 303 so that the seat 303 can be moved along a predetermined locus at least at two locations in the front-rear direction. A front / rear support mechanism 324 (F, R) for supporting, and a seat 303 that is disposed below the seat 303 and rotates about one axis m3 along the front / rear direction provided at the center in the left / right direction in the front / rear direction. The front / rear support mechanism 324 and the left / right support mechanism 323 both have a movably supported left and right support mechanism 323. Both the front and rear support mechanisms 324 and 323 have their seats 303 moved downward in the moving direction as the seat 303 moves from a predetermined reference position S3. Slope Return force generating devices P301 and P302 that generate a return force in a direction to return the seat 303 moved rearward or laterally from the reference position S3 to the reference position S3 according to the amount of movement. Is further provided.

  Also in this chair, the back 304 is attached to the back and forth swinging part 322 of the seat 303 or the back and forth support mechanism 324 of the seat 303 so as to be able to tilt backward, so that the operation of the seat 303 can be performed via the interlocking mechanism 300. It is interlocked and is set so that the rear tilt angle range of the back 304 is larger than the rear tilt angle range of the seat 303.

  The front support portion 324 (F) of the front / rear support mechanism 324 includes an elongated guide hole 310a provided in the support base 310 and a left / right shaft 322a that is a follower provided in the front / rear swing portion 322 of the seat 303. Are engaged with each other so as to be relatively movable in the front-rear direction. On the other hand, the back frame 304a is rotatably attached to the support base 310 around the left and right axis n1, and the rear support part is engaged by engaging the middle part of the back frame 304a and the rear part of the seat 303 via the axis n2. 324 (R). That is, when the seat 303 is at the reference position S3, the shaft 322a is located on the front end side of the guide hole 310a. When the seat 303 is tilted rearward from the reference position S3, the back frame 304a is first of the axis n1. In this case, the shaft n2 connected to the seat 303 is pulled back and downward, so that the seat 303 sinks backward while moving the shaft 322a to the rear end side in the guide hole 310a. Include. At this time, since the front support portion of the seat 303 also moves backward, the angle connecting the front support portion and the rear support portion is smaller than the rotation angle of the back frame 304a. As a result, the angle generated in the seat 303 is smaller. The angle change that occurs at the spine 304 is larger.

  A retainer 304r is held in front of the axis n2 of the back frame 304a via a pin 304b in the left-right direction, and a coil spring 300S as an elastic body is compressed between the retainer 304r and the retainer surface 310r of the support base 310. It is interposed in the state. That is, as the back frame 304a tilts backward, the retainer 304r is pushed forward and upward, thereby compressing the coil spring 300S and accumulating elastic force, and the longitudinal return mechanism P301 to the reference position S3 is provided. It is composed.

  On the other hand, the support base 310 is supported by a support base receiver 310K provided at the upper end portion of the gas spring 314 constituting the lifting mechanism via a longitudinal axis m3, and the support base 310 is supported with respect to the support base receiver 310K. The seat 303 swings to the left and right, and the seat 303 tilts backward with the spine 304 with respect to the support base 310. The left-right direction return mechanism P302 to the reference position S3 is provided at a position that swings left and right together with the coil springs 325 and 325, which are a pair of elastic bodies, provided on the support base receiver 310K. And a pressing portion (not shown) that compresses the coil spring 325 on the side that has been formed.

Even if it does in this way, the chair which shakes back and forth and right and left although it is a simple structure can be provided.
<Comparative example>

  In the third embodiment and the fourth embodiment, a chair that combines a structure in which the seat swings to the left and right and a structure in which the back seat is synchro-locked is realized, and at that time, the left and right support mechanism is rotated around one axis m in the front-rear direction. Although the structure is adopted, here, a structure using a pair of links g, g as the left and right support mechanism G as shown in FIG. 24, and a pair of guide holes h1 and followers h2 as the left and right support mechanism H as shown in FIG. Structures using the combinations are listed as Comparative Examples 1 and 2.

  First, in the embodiment shown in FIGS. 1 and 17, the left and right support mechanism 23 around one axis m in the front-rear direction is used. However, the structure shown in FIG. 24 is the first embodiment shown in FIG. 1 and the third embodiment shown in FIG. The upper end side of the pair of links g and g is pivotally attached at the pivot point g1 to the support base 10 of the embodiment, and the bracket 21a of the left and right swinging portion 21 is pivoted at the pivot point g2 on the lower end side of the links g and g. To wear. At this time, the distance between the pivot points g2 and g2 on the lower end side is made smaller than the distance between the pivot points g1 and g1 on the upper end side of the pair of links g and g.

  In this way, the left and right oscillating portion 21 moves leftward as shown in FIG. 24B with reference to the position where the left and right oscillating portion 21 is supported at the lowest position. The left link g1 positioned approaches the standing posture, and the right link g1 positioned on the non-moving side approaches the horizontal posture. The same applies to the case where the left and right rocking portion 21 moves in the direction opposite to that shown in the figure. As a result, the moving front end side of the seat 203 in FIG. 17 is guided to be lowered via the left and right swinging portion 21, and the center of gravity position becomes higher as it moves, so that the return force generating mechanism that returns to the reference position by gravity. Is realized by the gravity return mechanism.

  Then, if the left / right swinging portion 21 supports the front / rear swinging portion 24 in the same manner as in the third embodiment, the swinging motion of the back seat in the left / right direction and the synchro-rocking operation of the back seat can be performed. A chair can be realized. At this time, as in the third embodiment, an operation may be performed so that the back 204 does not tilt forward beyond the vertical.

  And if it does in this way, in addition to the seating feeling of the front-back direction demonstrated based on FIG. 12 and FIG. 13 in 1st embodiment, the operation | movement according to this can be performed also regarding the operation | movement of the left-right direction of the seat 3. FIG. Therefore, since the seat is moved forward as the seat 3 is tilted forward as if the seat NE 3 was tilted forward as if it were in accordance with the motion of the knee NE and the buttocks vicinity HP with the ankle AN of the seated person as a pivot, The knee NE is lowered by bending at the ankle AN and the knee NE, and the forward leaning posture can be smoothly taken without the lower leg being grasped between the seat and the ground.

  Moreover, in the comparative example 2 shown in FIG. 25, instead of the pair of links g1 and g1 shown in FIG. 24, a guide hole h1 having a guide surface and a follower h2 are used. That is, for example, a pair of guide holes h1 is formed in the support base 10 of the first embodiment or the third embodiment, and a follower h2 provided in the bracket 21a of the left and right swinging portion 21 is engaged with the guide holes h1. In this case, the guide surface of the guide hole h1 holds the left / right swinging portion 21 at the most stable position at the support position at the reference position, and moves to the right even if the left / right swinging portion 21 moves to the left from this position. Even so, the guide surfaces of the pair of left and right guide holes h1 that are convex upwardly guide the follower h2 so that the position of the center of gravity rises as a whole while the 21 moving front end side of the left and right swinging portion is lowered, and the follower h2 is guided by gravity. The return force generating mechanism that returns to the reference position is realized by a gravity return mechanism.

  Then, if the left / right swinging portion 21 supports the front / rear swinging portion 24 in the same manner as in the third embodiment, the swinging motion of the back seat in the left / right direction and the synchro-rocking operation of the back seat can be performed. A chair can be realized. At this time, as in the third embodiment, an operation may be performed so that the back 204 does not tilt forward beyond the vertical.

  A follower may be provided on the support base 10 side, and a guide hole may be provided on the left and right swinging portion 21 side. In this case, the guide surface of the guide hole is provided as a valley shape that protrudes downward.

  If it is not important that the back does not fall forward from the reference position, the left and right support mechanisms of Comparative Examples 1 and 2 may be combined with the normal synchro-rocking mechanism described in the fourth embodiment. I do not care.

  As mentioned above, although several embodiment of this invention was described, the specific structure of each part is not limited to embodiment mentioned above, A various deformation | transformation is possible in the range which does not deviate from the meaning of this invention.

  For example, a bending structure may be employed in which the front portion of the seat is inclined downward when it is inclined forward from the reference position. By doing in this way, compression to a thigh can be avoided.

  In the first embodiment, the gas spring, which is a lifting mechanism, is arranged between the left and right support mechanisms that are divided into two front and rear portions in a side view, but the front and rear support mechanism is arranged between the left and right support mechanisms divided into two front and rear portions. The vertical dimension of the mechanism portion can be suppressed while preventing the interference between the left and right support mechanisms and the front and rear support mechanisms.

  The present invention can be applied to a chair that can be suitably applied to an office rotary chair or the like.

DESCRIPTION OF SYMBOLS 1, 101, 301 ... Leg 2, 102, 302 ... Supporting device 3, 103, 203, 303 ... Seat 4, 104, 204, 304 ... Back 14 ... Vertical raising / lowering mechanism (gas spring)
16 ... Rotation support mechanism 21, 121 ... Left / right swinging part 21c, 121c ... Follower 22, 122 ... Front / rear swinging part 22a, 122a ... Guide hole 23, 123, 323 ... Left / right support mechanism 24, 124, 324 ... Front / rear support mechanism 24a, 124a ... link member (rear link)
24c, 124c ... lower swing shafts 24 (F), 124 (F) ... front support portions 24 (R), 124 (R) ... rear support portions 25 ... elastic bodies (coil springs)
m, m2, m3... axis P, P ′... restoring force generators P1, P101.
P2, P102 ... Left-right direction return mechanism (elastic body return mechanism)
Q, Q2 ... Seat tilt mechanism R ... Shockless part S, S2, S3 ... Reference position L1 ... Fixed link L2 ... Drive link L3 ... Driven link

Claims (22)

Legs standing from the floor,
A seat provided above the leg;
A support device interposed between the leg and the seat;
With
The support device is disposed below the seat, and is disposed at the front and rear support mechanisms that support the seat movably along a predetermined trajectory at least at two locations in the front-rear direction. A left and right support mechanism that is pivotally supported around one axis in the front-rear direction provided at the center position in the left-right direction when viewed from the front in the left-right direction, and each of the support mechanisms is adapted to move as the seat moves from a predetermined reference position. With a seat tilting function that tilts the front end side of the seat moving direction downward,
A chair further comprising a return force generating device that generates a return force in a direction to return the seat moved at least in the rearward direction or the left-right direction from the reference position to the reference position in accordance with a movement amount.   The chair according to claim 1, wherein the left and right support mechanisms are arranged separately in two front and rear positions. The chair according to claim 2, wherein a vertical lifting mechanism or a front-rear support mechanism is disposed between the left and right support mechanisms at two positions in the front-rear direction.   The left-right direction return mechanism that generates the return force in the left-right direction is an elastic body return mechanism that accumulates elastic force in an elastic body as the seat moves from the reference position. Chairs.   5. The center-of-gravity moving mechanism that raises the center of gravity of the seat in accordance with the movement of the seat from the reference position, wherein the front-rear direction returning mechanism that generates the return force in the front direction is provided. Chair.   The leg includes an up-and-down lifting mechanism, a seat is provided above the up-and-down lifting mechanism, and the support device is interposed between the up-and-down lifting mechanism and the seat. Chairs.   The chair according to any one of claims 1 to 6, wherein the support device supports the front and rear directions and the left and right directions so as to be independently operable along the predetermined trajectory.   The chair according to any one of claims 1 to 7, further comprising a rotation support mechanism that supports the seat so that the seat is horizontally rotatable. The front and rear support mechanism and the left and right support mechanism are configured separately.
The return force generator includes a front-rear direction return mechanism that generates a return force from the rear direction to the reference position, and a left-right direction return mechanism that generates a return force in the left-right direction that is configured separately from the front-rear direction return mechanism. The chair according to any one of claims 1 to 8, which is provided.   The chair according to claim 9, wherein the front-rear support mechanism and the left-right support mechanism are overlapped at a position overlapping in plan view.   The said front-back support mechanism is provided above the said left-right support mechanism, The seat and the back are attached to the front-back rocking | fluctuation part rock | fluctuated in the front-back direction by the said front-back support mechanism. Chairs.   The said front-back support mechanism is provided below the said left-right support mechanism, The seat and the back are attached to the left-right rocking | fluctuation part rock | fluctuated left-right by the said left-right support mechanism. The chair described in.   The said front-back support mechanism has a guide surface formed along the said predetermined locus | trajectory, and a follower which contact | connects this guide surface, A guide surface and a follower perform relative operation | movement. The listed chair.   The chair according to claim 13, wherein the front-rear support mechanism includes a slack portion that slows down the operation of the follower as it approaches the operation end of the follower.   The chair according to claim 13 or 14, wherein the front / rear support mechanism includes a shockless portion that absorbs an impact caused by a collision between an end portion of a guide surface and a follower at an operation end.   The chair according to any one of claims 1 to 15, wherein the front-rear support mechanism includes a link member whose operating end can move along the predetermined locus.   The chair according to any one of claims 1 to 16, wherein the leg has a caster that is capable of rolling on the floor surface.   18. The back according to claim 1, wherein the back is attached so as to be able to tilt backward relative to a front / rear support mechanism of the seat or a front / rear swinging part swinging back and forth by the front / rear support mechanism, and interlocks with the operation of the seat. The chair described in Crab.   The chair according to claim 18, wherein the back and the seat can be tilted backward via an interlocking mechanism, and the back tilt angle range of the back is larger than the back tilt angle range of the seat.   The chair according to any one of claims 1 to 19, wherein the seat moves rearward while raising its center of gravity when the back is tilted backward from a reference position.   A back-and-forth swinging part swinging back and forth by the back-and-forth support mechanism and a left-and-right swinging part swinging left and right by the left-and-right support mechanism; 12. An elbow is attached to a support base disposed on an upper end portion of a leg, and the elbow is attached to the support base or the front / rear swing portion when the left / right swing portion is supported by the front / rear swing portion. 12. The chair according to 12. The seat is supported by the front / rear support mechanism so as to move not only backward from the reference position but also forward, and the return force generator is configured to return the seat moved forward to the reference position. The chair according to any one of claims 1 to 21, wherein the return force is generated according to the amount of movement.

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