JP2006068223A - Chair with tilting mechanism of seat part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a mechanism structure of tilting a seat part and improve tilting function of a seat part by preventing an unstable twist in the turning direction of the seat part to a support part in a chair with the tilt mechanism of the seat part. <P>SOLUTION: This chair 10 with the tilt mechanism of the seat part is provided with the tilt mechanism disposed between the seat part 20 having a sitting surface 21 and a support plate 30 opposedly disposed in the lower part of the seat part 20 and tiltably supporting the seat part 20 to the support plate 30. The tilt mechanism is a universal joint 50 wherein two rotational shafts 53 and 55 forming a predetermined crossing angle between the seat part 20 and the support plate 30 are connected together via a connecting member 51, the rotational shaft 53 is pivoted to a yoke 52 rigidly joined with the seat part 20, and the rotational shaft 55 is pivoted to a yoke 54 rigidly joined with the support plate 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a chair with a tilting mechanism for a seat. Specifically, the seat portion having a seating surface is configured to be tiltable, and when the user is seated, the muscle that supports the user's lumbar spine can be contracted or relaxed by tilting the seat. The present invention relates to a chair with a tilting mechanism for a seat that can prevent back pain and improve posture.

In recent years, chairs for stools that are widely used in facilities such as general households and workplaces (and other schools, research laboratories, stores, hospitals, etc.) cause back pain to users due to their seating posture. It is regarded as a problem as it may lead to chronic posture deterioration. That is, normally, by sitting on a chair, a relaxing effect can be obtained by supporting the waist on the seating surface of the seat or supporting the back on the backrest. Therefore, the chair user gradually leans against the above-mentioned support surface while maintaining the sitting posture, and gradually takes a bad posture with the back rounded and the abdomen and neck protruding forward. Become. Therefore, if such a poor sitting posture is sustained, stress may be applied to the lumbar vertebrae (intervertebral disc and intervertebral joint) and the muscles and ligaments that support the lumbar vertebrae, causing back pain. In addition, as the use in such a mode is repeated for a long time, the muscles gradually weaken and the normal posture may be deteriorated chronically. Further, conventionally, treatments such as massage, body trimming, or wrinkles have been performed in order to reduce or eliminate symptoms such as the above-mentioned low back pain.
Therefore, as a technique for solving the above-described problem, for example, a technique disclosed in Patent Document 1 described below can be cited. In this disclosure, the chair is provided with a mechanism that supports the seat portion so that the seat portion can be tilted in the forward / backward / left / right directions with respect to the support portion with the vicinity of the center of the seat portion as a base point. Therefore, when the user sits on the seat and moves the weight in a desired direction such as front and rear, left and right on the seat, the user can perform an exercise of tilting the seat in a direction corresponding to the weight. Therefore, the muscle that supports the user's lumbar spine can be moderately contracted or relaxed with the tilting motion of the seat, thereby preventing back pain and improving posture.
JP 2002-119362 A

However, in the above-described conventional technique, the seat portion can be tilted and moved in the forward / backward and left / right directions with respect to the support portion, but the seat portion is rotated in the turning direction (the turning direction of the turning shaft of the chair). When exercising, certain problems may occur.
Specifically, in the technique of Patent Document 1, the plate-like support portion is connected to the upper portion of the rotation shaft of the chair so as to be relatively rotatable in the turning direction. Then, on the upper part of this support part (the support part is disposed with the plate surface facing the seating surface direction), the seat part is connected to the support part so as to be rotatable in a tilting direction and a turning direction. A ball joint for alignment is provided. Further, a plurality of cushion materials such as coil springs are disposed between the seat portion and the support portion, specifically, at the peripheral portion of the ball joint. That is, the above-described ball joint supports the seat in a state in which the seat can be rotated in the tilting direction and the turning direction with respect to the support, and the seat is supported in a normal posture position (for example, parallel to the support by a cushion material such as a coil spring). The movement in the tilting direction with respect to the support portion is elastically restricted by elastically supporting the posture position).
In this case, the seat portion is regulated by setting the position where the seat portion comes into contact with the support portion as the maximum tilt angle. However, when the seat portion is rotated in the turning direction, the above-described cushioning material such as a coil spring is not sufficient to restrict the turning motion, and as a result, between the seat portion and the support portion. An unstable twist (slack) was caused. As a result, the operational feeling of the seat portion becomes uncomfortable (the cushioning property is impaired), and an unexpected fatigue load is applied to the cushion material such as a coil spring, which causes a decrease in function. In addition, in order to suppress the occurrence of the twist described above, for example, a design that increases the rigidity of a cushion material such as a coil spring or sets a sliding resistance when the rotating shaft and the support portion rotate is set small. In this case, however, the tilting operability of the seat portion may be impaired, and there may be a problem that the resistance balance between the respective portions is lost due to long-term use. In particular, in a fixed chair that does not have a rotation shaft, the design is not designed to rotate the seat in the turning direction, and the above-described unstable twisting in the turning direction occurs. There was a possibility of causing unexpected damage.
In addition, as described above, the configuration in which a plurality of cushion materials such as coil springs are arranged makes the entire structure complicated.

  The present invention was created as a solution to the above-described problems, and the problem to be solved by the present invention is to simplify the mechanism structure for tilting the seat in the chair with the tilt mechanism of the seat, Furthermore, it is intended to improve the tilting motion function of the seat portion so as not to generate an unstable twist in the turning direction with respect to the support portion of the seat portion.

In order to solve the above-described problems, the chair with a tilting mechanism for a seat according to the present invention takes the following means.
First, the first invention of the present invention is arranged between a seat part having a seating surface and a support part arranged facing the lower part of the seat part so that the seat part can be tilted with respect to the support part. A chair with a tilting mechanism of a seat part configured to have a tilting mechanism to support, wherein the tilting mechanism has two rotating shafts in a state where a predetermined intersection angle is formed between the seat part and the support part. A yoke that is connected via a connecting member, one of the rotating shafts is pivotally supported by a yoke that is rigidly joined to the seat portion, and the other rotational shaft is rigidly joined to the support portion. It is a universal joint that is supported by the shaft.
Here, when the predetermined intersection angle formed by the rotation shafts is set to be, for example, an orthogonal state, the seat portion is tiltable in the entire circumferential direction relative to the support portion.
Moreover, the following three patterns are mentioned as a connection state with respect to the connection member of a rotating shaft, or the axial support state with respect to the yoke of a rotating shaft. That is, (a) the rotating shaft is connected in a state where it can be rotated relative to the connecting member, and is supported in a state where it can be rotated relative to the yoke. ) A state in which the rotation shaft is connected in an integrally joined and fixed state in which the rotation shaft is relatively unrotatable with respect to the connection member, and is supported in a state in which the rotation shaft is relatively rotatable. c) A state in which the rotation shaft is connected in a state where the rotation shaft is relatively rotatable with respect to the connection member, and is supported in an integrally joined and fixed state where the rotation shaft is relatively unrotatable with respect to the yoke It is. In addition, when it can be set as the connection state which rigidly joined rotation means by means, such as welding, it does not necessarily need to be in the connection state via a connection member.
According to the first aspect of the invention, the seat portion is supported to be tiltable with respect to the support portion by the universal joint constituting the tilt mechanism. Specifically, one of the two rotating shafts connected to the connecting member at a predetermined crossing angle is pivotally supported by a yoke rigidly joined to the seat portion. The other rotation shaft is pivotally supported by a yoke rigidly joined to the support portion. Accordingly, since the seat portion can be rotated around the respective rotation shafts described above, the seat portion can be rotated within a range of a direction in which the rotation directions allowed by the both rotation shafts are combined. That is, the seat portion is in a state in which it can tilt relative to the support portion within the above-described range. Further, the relative movement of the seat portion in the turning direction with respect to the support portion is restrained by the state of connection (axial support) to the connecting member and the yoke of the rotating shaft and the rigid connection state to the seat portion and the support portion of the yoke. Is done.

Next, according to a second aspect of the present invention, in the first aspect described above, at least one of the seat portion and the support portion is further relative to a predetermined tilt direction position where the seat portion is aimed at the support portion. A regulating member formed in a height shape that abuts against a side surface that receives a load accompanying the relative movement of the seat portion when the seat portion is moved and regulates the relative movement of the seat portion is disposed.
According to the second aspect of the invention, the relative movement in the tilting direction with respect to the support portion of the seat portion is restricted to the target predetermined position by the restriction means.

Next, according to a third aspect of the present invention, in the first or second aspect described above, at least one of the seat portion and the support portion elastically supports the seat portion toward the normal posture position. The elastic support member is formed in a shape surrounding the tilting mechanism by integral molding of resin or rubber, and is disposed between the seat portion and the support portion.
According to the third aspect of the invention, the elastic support portion is formed and disposed in a shape surrounding the tilt mechanism by integral molding of resin or rubber. Therefore, for example, the entire structure is not complicated as compared with a case where a plurality of spring members such as coil springs are arranged around the tilting mechanism. Further, when the seat portion is relatively moved in the tilting direction, the surrounding shape of the elastic support portion is in wide contact with the back surface of the seat portion, and the load is elastically received by the entire contact surface.

Next, according to a fourth aspect of the present invention, in the third aspect described above, the elastic support portion is formed with a protruding shape that protrudes to a portion where the seat portion and the restricting means abut. Is interposed between the seat and the restricting means to alleviate the collision.
According to the fourth aspect of the present invention, the overhang shape formed on the elastic support portion is formed so as to be interposed at the portion where the seat portion and the regulating means abut. Therefore, since the seat portion comes into contact with the restricting means via the above-described protruding shape, the collision caused by the contact is alleviated.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first aspect of the present invention, by applying a universal joint as a tilting mechanism of the seat portion, tilting motion can be performed while maintaining a connected state in which the seat portion can tilt with respect to the support portion. it can. Further, this tilting mechanism can also be used as a function of preventing the seat portion from generating unstable torsion in the turning direction with respect to the support portion. Therefore, the operability of the tilting motion with respect to the support portion of the seat portion can be improved. Moreover, the whole mechanism structure can be simplified and the dimensional accuracy and productivity of each part can be made favorable. That is, by using the chair of the present invention, training by tilting motion can be satisfactorily performed in order to prevent back pain and improve posture of the user.
Further, according to the second aspect of the present invention, the maximum movement position when the seat portion tilts with respect to the support portion can be restricted to a predetermined target position. Accordingly, it is possible to easily change the maximum tilt angle of the seat portion according to conditions such as the purpose of use or to set the maximum tilt angle to be different depending on the tilting direction of the seat portion.
Furthermore, according to the third aspect of the present invention, since the number of parts of the structure that elastically supports the seat portion can be suppressed, the structure can be simplified and the productivity can be improved. Moreover, since the load received with the relative movement of the seat portion can be received on a wide surface, the support function can be stably exhibited.
Furthermore, according to the fourth aspect of the present invention, it is possible to mitigate the regulation force (collision) received when the tilting movement is made to a predetermined position aiming at the seat and the collision sound generated. Therefore, it is possible to improve the feeling of use during the tilting movement of the seat.

Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.
FIGS. 1-6 shows the chair 10 with the tilting mechanism of the seat part of a present Example. 1 is an exploded perspective view of a chair 10 with a tilting mechanism for a seat, FIG. 2 is a cross-sectional view showing the internal structure of the chair 10 with a tilting mechanism for a seat in a side view, and FIG. 3 is an enlarged view of a main part of FIG. 4 is a cross-sectional view showing the internal structure of the chair 10 with the tilting mechanism of the seat portion, FIG. 5 is an enlarged view of the main part of FIG. 4, and FIG. 6 is a plan view of the chair 10 with the tilting mechanism of the seat portion. .

As shown in FIG. 1, a chair 10 with a tilting mechanism for a seat according to the present embodiment (hereinafter referred to as a chair 10) includes a seat 20 having a seating surface 21 and a support plate that supports the seat 20. The structure such as 30 is attached and fixed on the support portion 41 of the support frame 40. Here, the support plate 30 corresponds to the support portion of the present invention. Specifically, the seat portion 20 is connected to the support plate 30 by a universal joint 50 (details of which will be described later) at a position near the center thereof. It is supported so that it can tilt. Further, the chair 10 of the present embodiment does not include a pivot shaft member that pivots the seat portion 20 in the turning direction 91 (see FIGS. 1 and 6) on the support frame 40, and is a so-called fixed type. It is.
Accordingly, when the user sits on the seat 20 and moves the body weight in a desired tilting direction 90 such as front, back, left and right on the seat 20, the seat 20 is moved in a direction that matches the direction in which the body weight is moved. Can be tilted. Thereby, along with the tilting motion of the seat portion 20, the muscles (other than the abdominal muscle group, etc.) that support the user's lumbar spine can be appropriately contracted or relaxed. Further, since the seat portion 20 is in a tiltable state as described above, when the user sits on the seat portion 20, the user tries to balance the seating surface 21, so that the seating surface 21 and the backrest portion 43 are placed. It won't lean on you. Therefore, it is possible to assist the user in a correct posture such that the head and the spine are naturally aligned. With these effects, it is possible to prevent the back pain and improve the posture of the user.
Hereinafter, the configuration of each part of the chair 10 will be described in detail.

First, the seat portion 20 is formed with a seating surface 21 in a shape of being stretched by including a cushion material on the surface (upper surface) of the seat plate 22 as well shown in FIGS. 1 and 2. In addition, an attachment plate 23 for joining a universal joint 50 described later is attached to the back surface (lower surface) of the seat plate 22 with a stopper such as a screw.
Next, as well shown in FIGS. 1 and 2, the support plate 30 is formed in a saucer shape in which a groove 31 is formed in the vicinity of the peripheral edge and an eaves 32 that rises while curving outward in the radial direction. Is formed. Specifically, screw holes 33 for attaching and fixing the support plate 30 to the support portion 41 of the support frame 40 by a fastener (not shown) such as a screw are formed in the concave groove 31 near the periphery at a plurality of locations. Yes. Further, a thin cylindrical regulating member 60 is rigidly joined to a position along the center of the support plate 30 (a position inward in the radial direction). Specifically, the lower surface portion 61 of the regulating member 60 is rigidly joined to the upper surface of the support plate 30 by welding (see FIGS. 3 and 5). Further, as well shown in FIG. 3, the restricting member 60 has a shape in which the upper side is cut off obliquely downward from the rear direction 93 side toward the front direction 92 side to form a sloped upper surface portion 62. Has been.

Next, as well shown in FIGS. 1 to 3, a buffer material 70 formed in a thick cylindrical shape is disposed around the restriction member 60 on the support plate 30. Here, the cushioning material 70 corresponds to the elastic support member of the present invention. Specifically, the cushioning material 70 is formed by foam molding with a synthetic resin such as urethane resin, and is set so that the diameter inside the hollow is slightly larger than the outside diameter of the regulating member 60 described above. Yes. Further, the outer diameter dimension of the cushioning material 70 is set to a size that does not cover the concave groove 31 of the support plate 30. Note that the outer diameter is not particularly limited as long as the outer diameter is within the outer diameter of the support plate 30.
That is, the buffer material 70 has a shape that is set on the support plate 30 in such a manner that the regulating member 60 is fitted (enclosed) in the hollow interior. Further, as shown in FIGS. 3 and 5, the height shape of the cushioning material 70 is such that the cushioning material 70 protrudes from the regulating member 60 when the cushioning material 70 is set on the support plate 30. Is set.
Further, as well shown in FIG. 3 and FIG. 6, an overhanging shape 71 projecting radially inward is formed on the upper side of the cushioning material 70, and the overhanging shape 71 is a regulating member. The upper surface portion 62 of the 60 is disposed above.

Next, as shown in FIGS. 1 and 6, the support frame 40 that forms the skeleton of the chair 10 is formed by bending a long thin circular tube member to form a leg portion 44 and a backrest portion 43. ing. Specifically, the leg portion 44 is provided with a step 45 for placing both feet of the seated user. This step 45 is disposed at such a position that when the user is seated, the knee is slightly bent from the normal sitting posture and the lower leg is disposed inside. Thereby, the seating posture of the user is urged so that the back muscles naturally extend. Further, the backrest part 43 is formed in a shape in which the upper end side of the part rising from the leg part 44 is curved in the rearward direction 93 so as to support the load in the rearward direction 93 applied from the back part of the seated user. Yes.
Further, in the vicinity of the center of the part rising from the leg part 44, a support part 41 having a shape in which the center is bent in a U shape toward the front direction 92 is stretched over and joined to both side frames. The support portion 41 is mounted and fixed to the support plate 30 with a stopper such as a screw (a screw hole 42 is formed in the support portion 41), thereby the seat portion connected to the support plate 30. The downward load received from 20 is supported. Therefore, the load acting on the support portion 41 by sitting is received by the rigidity of the entire support frame 40.

Next, the universal joint 50 forms an angle at which the two rotation shafts 53 and 55 are orthogonal to the cylindrical connecting member 51, as well shown in FIG. 1, FIG. 2, and FIG. It is set as the structure penetrated and connected. Specifically, as shown well in FIGS. 3 and 5, the rotation shaft 53 on one side penetrates the upper side of the connection member 51, and the rotation shaft 55 on the other side extends to the lower side of the connection member 51. It is in a connected state through which it can be rotated. Further, the above-described rotation shafts 53 and 55 are pivotally supported by substantially U-shaped yokes 52 and 54, respectively. The upper yoke 52 is rigidly joined by welding to the mounting plate 23 of the seat 20 (see FIG. 3), and the yoke 54 is rigidly joined to the support plate 30 by welding (see FIG. 3). 5).
As a result, the connecting member 51 is rotatable about the rotation shaft 55 with respect to the support plate 30. Further, the seat portion 20 is rotatable about the rotation shaft 53 with respect to the connecting member 51. That is, the seat portion 20 is brought into a rotatable state by the universal joint 50 in a range of directions in which the rotation directions allowed by the rotation shaft 53 and the rotation shaft 55 are combined (that is, the entire circumferential direction). In other words, the seat portion 20 is tiltable with respect to the support plate 30 in the entire circumferential direction.
The seat portion 20 is connected to the connecting member 51 and the yokes 52, 54 of the rotating shafts 53, 55, the mounting plate 23 of the yokes 52, 54 that supports the rotating shafts 53, 55, and the like. The relative movement in the turning direction 91 (see FIG. 1) with respect to the support plate 30 is restricted by the joining state with respect to the support plate 30.

That is, the seat portion 20 is supported so as to be tiltable with respect to the support plate 30 via the universal joint 50 as a tilting mechanism, as well shown in FIGS. 2 and 4. Further, a cushioning material 70 is disposed between the seat portion 20 and the support plate 30, and the seat portion 20 is moved to a normal posture position (the seat portion 20 is tilted with respect to the support plate 30 by the cushioning material 70. It is elastically supported toward the position that is not. Therefore, when the seat portion 20 is moved relative to the support plate 30 in the tilting direction 90, the cushioning material 70 widely contacts the mounting plate 23 (the back side of the seat portion 20) and elastically deforms due to its surrounding shape. . Then, the cushioning material 70 causes a resilient force against the elastic deformation to act on the mounting plate 23. Therefore, the tilting motion of the seat portion 20 with respect to the support plate 30 is relaxed while being elastically received by the cushioning material 70.
3 and 5, the relative movement of the seat portion 20 in the tilting direction 90 is restricted to a target position by a restriction member 60 disposed on the support plate 30. Is done. Specifically, when the seat portion 20 is relatively moved in the tilting direction 90 (see FIGS. 2 and 4), the mounting plate 23 abuts on the upper surface portion 62 of the restricting member 60, and the seat portion 20 is relatively moved. Stopped. Further, as well shown in FIG. 3, the regulating member 60 has a shape that is cut obliquely downward from the rear direction 93 side toward the front direction 92 side. Therefore, the seat portion 20 is regulated by the inclined upper surface portion 62 so that the relative movement amount in the rear direction 93 is smaller than the relative movement amount in the front direction 92. Thereby, the seat part 20 does not tilt greatly in the rear direction 93 rather than the front direction 92, and makes it difficult for the user to feel the possibility of falling in the rear direction 93 during the operation. Further, an overhanging shape 71 of the cushioning material 70 is disposed above the upper surface portion 62 of the regulating member 60. Accordingly, when the seat portion 20 is relatively moved in the tilting direction 90 to the target position (the mounting plate 23 is brought into contact with the regulating member 60), the protruding shape 71 is formed on the upper surface portion of the mounting plate 23 and the regulating member 60. 62, and this tilting motion is received with local elastic deformation. Therefore, the restriction force (collision force) and the collision sound acting between the mounting plate 23 and the restriction member 60 are alleviated.
A seat back cover 80 formed so as to cover the periphery of the support plate 30 is attached and fixed to the back side of the seat portion 20 with a fastener (not shown) such as a screw.

Then, the usage method of the chair 10 with a tilting mechanism of the seat part of a present Example is demonstrated.
First, the user sits on the seat portion 20 of the chair 10 and moves the weight on the seat portion 20 in a desired direction such as front and rear, left and right. Then, the seat portion 20 moves relative to the support plate 30 in the tilting direction 90 according to the direction of weight movement while the connected state to the support plate 30 is maintained by the mechanism of the universal joint 50 (FIGS. 2 and FIG. 2). 4). At this time, since the relative movement of the seat portion 20 is performed while compressing and elastically deforming the cushioning material 70 by the load accompanying the weight shift, the cushioning material 70 is relaxed by the elastic force of the elastic deformation. Behavior. Then, when the mounting plate 23 of the seat 20 reaches the position of the upper surface portion 62 of the regulating member 60, the overhanging shape 71 of the cushioning material 70 interposed therebetween causes this load with local compression elastic deformation. Take it. Accordingly, since the collision force and the collision sound between the mounting plate 23 and the regulating member 60 are alleviated, the seat portion 20 is gently restricted and restrained.
Then, by moving the weight again in a different direction in this state, it is possible to repeatedly perform the exercise of tilting the seat portion 20 described above. In addition, after use, the user unloads away from the seat portion 20, whereby the seat portion 20 is restored to the normal posture position by the elastic force of the cushioning material 70.

Thus, according to the chair 10 with the tilting mechanism of the seat portion of the present embodiment, the universal joint 50 is applied to the mechanism for tilting the seat portion 20, thereby connecting the seat portion 20 and the support plate 30 together. The seat 20 can be supported to be tiltable in the entire circumferential direction with respect to the support plate 30 while maintaining the state of being connected (connected). Therefore, since the connection state (support state) between the seat portion 20 and the support plate 30 is stable, the tilting motion of the seat portion 20 can be stably performed. In addition to the above-described function, the universal joint 50 has a function of preventing an unstable twist in the turning direction 91 (see FIGS. 1 and 6) of the seat portion 20 with respect to the support plate 30. The entire mechanism structure is simplified. Therefore, the dimensional accuracy and productivity of each part of the mechanism structure can be improved.
Further, the relative movement of the seat portion 20 in the tilting direction 90 with respect to the support plate 30 can be restricted to the target position by the restriction member 60. In this embodiment, the relative movement amount in the rear direction 93 is restricted to be smaller than the relative movement amount in the front direction 92 of the seat portion 20. Therefore, it is possible to make it difficult for the user to feel the possibility of falling in the rearward direction 93 of the chair 10. In fact, since it is difficult for the user to fall in the backward direction 93, the safety during the use operation can be improved.
Further, the cushioning material 70 corresponding to the elastic support member of the present invention is formed in an integral shape so as to surround the regulating member 60 disposed around the universal joint 50. Therefore, for example, the entire structure can be simplified as compared with a structure in which a plurality of spring members such as coil springs are arranged around. Further, according to the cushioning material 70, when the seat portion 20 is tilted, the cushioning function is stably exhibited because the seat portion 20 is in wide contact with the back side of the seat portion 20 to receive the load. In addition, since the seat portion 20 is not twisted in the turning direction 91 (see FIGS. 1 and 6), an unexpected fatigue load is not applied and problems such as plastic deformation are not caused.
Furthermore, the overhanging shape 71 formed on the cushioning material 70 described above can alleviate a collision when the seat portion 20 and the regulating member 60 come into contact with each other. Therefore, the feeling of use at the time of tilting movement of the seat part 20 can be improved.
That is, since the tilting motion of the seat portion can be satisfactorily performed as described above, by using the chair 10, it is possible to perform training for appropriately contracting or relaxing the muscles that support the user's lumbar spine. Therefore, the sitting balance at the time of sitting can be improved to prevent back pain and improve posture.

Although the embodiment of the present invention has been described with respect to one example, the present invention can be implemented in various forms in addition to the above example.
For example, in the present embodiment, a structure in which the structure of the support frame 40 that supports and supports the support plate 30 is a so-called fixed type is shown, but the support plate 30 can be rotated in the turning direction 91 with respect to the support frame 40. It may be a so-called turning type.
Further, although the two rotating shafts 53 and 55 constituting the universal joint 50 are shown in a connected state by passing through the connecting member 51, the rotating shafts are rigidly joined to each other by means such as welding. It may be what. Further, although the angle formed by the two rotation shafts 53 and 55 is shown as being orthogonal, it may be connected at other angles. Thereby, for example according to conditions, such as a use purpose, it can control so that the tilting motion to the predetermined direction of a seat part may not be performed. Further, although no particular mention was made of the separation dimension between the pivot shafts 53 and 55 penetrating through the connecting member 51, for example, by changing the separation dimension, the pivot radius when the seat portion is tilted in the front-rear direction, for example. The ratio of the turning radius in the left-right direction with respect to can be adjusted. Therefore, for example, a configuration specialized in a mechanism that easily tilts the seat portion in the left-right direction can be employed. In addition, although the rotation shafts 53 and 55 are connected to the connecting member 51 and the yokes 52 and 54 so as to be rotatable relative to each other, the rotating shafts 53 and 55 are connected to be rotatable relative to only one of them. It may be in a state.
Further, although the cushioning material 70 and the regulating member 60 are disposed on the support plate 30 side, they may be disposed on the seat portion side. Furthermore, although the cushioning material 70 is formed by foaming with a synthetic resin such as a urethane resin, it may be formed with other resin or rubber. Moreover, although the buffer material 70 showed what was integrally formed in the thick cylindrical shape (closed cross-sectional shape) so that the restriction member 60 might be surrounded, it formed in the open cross-sectional shape like cross-sectional C shape, for example It may be the one that was made.
Further, the upper side of the regulating member 60 is cut off obliquely downward from the rear direction 93 side toward the front direction 92 side, and the relative movement amount of the seat portion 20 in the rear direction 93 is greater than that of the front direction 92. However, it may be a shape that is obliquely cut off in other directions according to the conditions of use, etc., and such a shape is not particularly provided. It does not matter.

It is a disassembled perspective view of the chair with the tilting mechanism of a seat part. It is sectional drawing which showed the internal structure of the chair with the tilting mechanism of a seat part by the side view. It is a principal part enlarged view of FIG. It is sectional drawing which showed the internal structure of the chair with the tilting mechanism of a seat part by the front view. It is a principal part enlarged view of FIG. It is a top view of a chair with a tilting mechanism of a seat part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Chair with tilting mechanism of seat part 20 Seat part 21 Seating surface 22 Seat plate 23 Mounting plate 30 Support plate (support part)
31 concave groove 32 eaves 33 screw hole 40 support frame 41 support part 42 screw hole 43 backrest part 44 leg part 45 step 50 universal joint 51 connecting member 52 yoke 53 rotating shaft 54 yoke 55 rotating shaft 60 regulating member 61 lower surface part 62 Upper surface part 70 cushioning material (elastic support member)
71 Overhang shape 80 Seat back cover 90 Tilt direction 91 Turning direction 92 Front direction 93 Back direction

Claims (4)

A tilting mechanism that is disposed between a seat having a seating surface and a support disposed opposite to the seat and supports the seat so as to be tiltable with respect to the support; A chair with a tilting mechanism of a configured seat,
In the tilting mechanism, two rotating shafts in a state where a predetermined intersection angle is formed between the seat portion and the support portion are connected via a connecting member, and one of the rotating shafts is connected to the tilting mechanism. The rotating shaft is pivotally supported by a yoke rigidly joined to the seat portion, and the other rotational shaft is a universal joint that is pivotally supported by a yoke rigidly joined to the support portion. A chair with a tilting mechanism for the seat. It is a chair with the tilting mechanism of the seat part according to claim 1,
Furthermore, at least one of the seat part and the support part includes a load accompanying the relative movement of the seat part when the seat part is relatively moved to a predetermined tilt direction position aimed at the support part. A seat with a tilting mechanism for a seat portion, characterized in that a restricting member formed in a height shape that abuts against a side surface that receives the seat and restricts relative movement of the seat portion is disposed. It is a chair with the tilting mechanism of the seat part according to claim 1 or 2,
Further, at least one of the seat portion and the support portion is formed with an elastic support member that elastically supports the seat portion toward the normal posture position so as to surround the tilt mechanism by integral molding of resin or rubber. And a seat with a tilting mechanism for the seat, wherein the chair is disposed between the seat and the support. It is a chair with the tilting mechanism of the seat part according to claim 3,
The elastic support portion is formed with a protruding shape that protrudes to a portion where the seat portion and the restricting means come into contact with each other, and the protruding shape is interposed between the seat portion and the restricting means to cause a collision. A chair with a tilting mechanism for the seat, which is characterized by relieving stress.

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