JP2022009753A - Chair - Google Patents

Abstract

[Problem] To provide a chair that swings left and right following the movement of a seated person, in which a person is notified that the chair has a swing function so as to eliminate confusion of the user after sitting down, and the swing angle is accurately defined to ensure safety and safety. Realize swing motion with sharpness. A chair has a seat (1) and legs (2), and the legs (2) have a lower frame (6) and a post (7). By bending the front member 6a and the rear member 6c of the lower frame 6 downwardly, the chair as a whole is allowed to swing left and right. Spherical stoppers 12 are conspicuously provided at the left and right ends of the front member 6a. Since the stopper 12 is floating from the floor, even a person who sees it for the first time can understand that the chair has a swing function. Since the swing movement is regulated by the stopper 12, the movement due to inertia is eliminated, which makes it safe and realizes a sharp movement. [Selection drawing] Fig. 4

Description

There is an application for application of Article 30, Paragraph 2 of the Patent Law. Exhibited at the exhibition "8th Education IT Solution EXPO" held for 3 days from May 17th to 19th, 2017.

The present invention relates to a chair that allows a seated person to swing left and right following the movement (swing) of the upper body from side to side.

Chairs are generally designed to sit stably on the floor, but by forming the lower end surface (contact patch) of the legs in a downward convex shape when viewed from the front, they swing left and right following the left and right movements of the seated person. As a version of the chair, the applicant of the present application discloses in Patent Document 1 a configuration in which the seat surface is recessed downward so as to imitate the roundness of the seated person's body (buttocks and thighs). bottom.

Japanese Patent Application No. 2017-97353

In recent years, the importance of worker health management in the office has been pointed out. Therefore, if a swing-type chair that has a function as an exercise tool and can contribute to a change of mood and promotion of blood circulation can be effectively used in the office, the worker Although it is beneficial for both the user and the administrator, if the seat surface is dented as in Patent Document 1, the user's physical stability is excellent and there is an image that it is easy to sit visually, so there is no discomfort even in the office. It can be said that it can be used and the range of use can be expanded.

In addition, chairs that swing back and forth as chairs for infants and the elderly have existed for a long time, but chairs that allow the seated person to actively swing left and right are novel, and the surrounding environment is softened by unexpectedness and a kind of playfulness. It also has the effect of being able to do so, and in this respect as well, it can be said that it can contribute to improving the environment such as office environment and business negotiations.

In this way, swing-type chairs have excellent effects, but when used as chairs used by unspecified people, such as chairs installed at the counters of various facilities, the swing function is known. When a person who does not come in contact with him for the first time, there is a concern that the chair may be tilted due to the movement of his body, which may cause confusion. Even if the chair is tilted, it is easy to understand that it is a chair with such a function, but it can be said that it is user-friendly if it can be visually grasped that it has a swing function in the state before use. In addition, it is safe to be able to regulate the movement due to inertia and specify the swing amount.

The present invention has been made in the wake of such a situation, and is intended to provide a more improved swing type chair.

As claimed in claim 1, the present invention includes a seat and legs supporting the seats, and the lower end surface of the legs is formed in a downward convex shape in a front view with vertices located in the middle left and right. The seat and legs are integrated so that they can swing to the left and right, and stoppers that come into contact with the floor are projected downward on both the left and right sides of the lower end surface of the legs.

The invention of the present application can be developed in various ways. As a preferred example thereof, in claim 2, the lower end portion of the leg resting on the floor has a left and right horizontally long front member and left and right side members extending backward from both left and right ends thereof. The stopper is arranged in a corner portion where the front member and the side member are connected or in the vicinity thereof in a state of being exposed so as to be visible to the public.

Further, in claim 3, at least the lower surface of the stopper is formed into a rounded curved surface in claim 1 or 2. According to a fourth aspect of the present invention, in any one of the first to third aspects, the stopper is attached to a bolt or nut provided on the leg by screwing.

In the present invention, as in Patent Document 1, it is preferable that the upper surface (seat surface) of the seat is recessed so that the buttocks and thighs of the seated person fit (wrap around from below).

When the chair swings and is fully tilted, a large force acts as a moment on the floor. Therefore, if the end of the leg directly hits the floor, the floor may be easily damaged. However, if a stopper is provided as in the present invention, the stopper may have a cushioning function to prevent the floor from being damaged. It can be suppressed.

In addition, since the swing movement is regulated (regulated) by the stopper, it is possible to realize a sharp swing movement, and the swing amount is kept constant even if the force applied to the chair by the user is different, which is safe. .. In other words, if a downward stopper is provided, if the stopper hits the floor and then tries to swing further, it must be rotated with the stopper as a fulcrum, but this requires a very large amount of kinetic energy, so it is normally used. In the state, the swing amount is accurately defined even if the magnitude of the kinetic energy that shakes the body is different, and therefore, the swing is not excessive due to inertia.

It is possible to swing the chair further even after the stopper comes into contact with the floor by applying a very large acceleration according to the intention of the user, and the maximum swing amount in this case is the kinetic energy of the person. It will depend on the size.

Then, by providing the stopper in a state where it can be seen by the public as in claim 2, the user can visually understand that the chair has a swing function, so that the chair can be used by an unspecified number of people. Even if it is used, it can prevent the chair from tilting and being confused after a person sits down.

That is, because the stopper is floating from the floor, it makes the person immediately understand that the chair tilts and the stopper touches the floor, so that the person immediately understands that it is a swing type chair. It is possible to prevent a situation where you are confused after sitting down. In this case, it is more preferable to form the stopper in a conspicuous color such as red or green because the visibility is improved. It can be said that visibility is improved by using a color different from the color of the legs, especially warm colors.

When at least the lower surface of the stopper is formed on a curved surface as in claim 3, the stopper hits the floor in a point contact manner even if the posture of the stopper is slightly different or the floor is uneven due to manufacturing errors or the like. A stable contact function can be ensured in contact. That is, a stable contact state can be ensured by absorbing mounting errors and the like. Further, when the stopper is formed in a spherical shape, the stopper is in a swollen state and the surface area is increased, so that the visibility can be further improved when viewed from the front or the side of the chair.

When the method of attaching by screwing as in claim 4 is adopted, it is possible to reduce the labor of work when assembling the chair and it is easy to replace the chair if it is damaged. Also, if the stopper is a color different from the color of the chair, a one-point mark-like aesthetic feature will be produced, but it will be easy for the user to replace it with a different color according to his / her taste. Further, if a plurality of types of stoppers having different heights are prepared, it is possible to easily change the swing angle (to be exact, the minimum swing angle).

It is a figure showing an embodiment, (A) is a perspective view seen from the front, (B) is a perspective view seen from the back, (C) is a separated perspective view, and (D) is a perspective view seen from below. (A) is a front view and (B) is a bottom view. (A) is a side view, (B) is a rear view, and (C) is a separated perspective view of a main part. (A) is a partial front view, (B) is a partial side view, and (C) is a perspective view seen from the direction of arrow IIIC in FIG. 1 (A).

(1). Structure of First Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. In the following, the words front and back and left and right are used to specify the direction, but the front, back, left and right are based on the direction of the person who is normally seated. The front view direction is the direction facing the seated person.

As can be understood from FIG. 2, in the present embodiment, the chair includes a seat 1 and legs 2 that support the seat 1. The seat 1 includes a wooden or resin seat plate 3 and a cushion material 4 stretched on the upper surface thereof, and the cushion material 4 is covered with a skin material (not shown). The seat 1 is a substantially quadrangle in a plan view and has rounded corners.

The seat 1 (the seat plate 3 and the cushion material 4) is gently curved downward (recessed) so as to be concave upward when viewed from the front, and the rear end is gently curved upward when viewed from the vertical side. It has become. That is, the upper surface of the seat 1 (the upper surface of the seat plate 3 and the cushion material 4) is a concave surface that fits the curved surface of the buttock and thigh of the seated person. Further, the seat 1 is generally leaning forward (may be in a horizontal posture or may be in a backward leaning posture). A belt-made pull tab 5 used for pulling and moving the chair is provided at the rear end of the seat 1.

The legs 2 are made of metal pipes or rods, and have a lower frame body 6 that rests on the floor, left and right columns 7 that rise from the left and right ends of the front end of the lower frame body 6, and columns 7. The upper frame body 8 provided at the upper end is provided, and the bracket 9 is fixed to the upper frame body 8 and the seat plate 3 is fixed to the bracket 9. The lower end of the column 7 is located at the front end of the seat 1 in a plan view, but the upper end of the column 7 is located slightly behind the front end of the seat 1 (in front of the front / rear intermediate position of the seat 1). ing. Therefore, the column 7 is tilted backward at a gentle angle.

The lower frame body 6 has left and right horizontally long front members 6a, front and rear longitudinal left and right side members 6b, and rear members 6c connected to the rear ends of the left and right side members 6b, and has side members 6b and rear members. The rear corner portion 6d connected to the 6c is curved in a plan view. Therefore, the side member 6b and the rear member 6c are U-shaped in a plan view. A reinforcing member is fixed to the connection portion between the front member 6a and the side member 6b.

The front end of the side member 6b is welded to the front member 6a, and the columns 7 are bent and formed at both left and right ends of the front member 6a. The upper frame body 8 is formed by bending the upper end of the support column 7 backward and then bending it further inward. Therefore, the upper frame body 8 also has a U-shaped opening facing forward in a plan view as a whole. The front member 6a is a front ground contact portion.

Further, as is clearly shown in FIG. 2, the left and right end portions of the front member 6a constituting the lower frame body 6 protrude to the left and right outside of the seat 1 in a plan view. Therefore, high stability can be ensured even when swinging, and a plurality of chairs can be stacked up and down. That is, the lower frame 6 of the upper chair can be fitted behind from between the left and right columns 7 of the lower chair, and the chairs can be stacked up and down. Therefore, it is advantageous for storage when not in use.

The bracket 9 is composed of a U-shaped frame body 9a that opens backward in a plan view and a lip 9b that projects inward from the frame body 9a, and the frame body 9a is fixed to the upper frame body 8 by welding. , The lip 9b is fixed to the seat plate 3 by a screw inserted from below. When the bracket 9 is provided as in the present embodiment, the seat 1 can be firmly fixed while the upper frame body 8 is arranged outside the seat 1. Further, since the bracket 9 projects toward the front of the upper end of the support column 7, the seat 1 can be firmly and stably fixed to the leg 2 even when the support column 7 is tilted backward.

The front member 6a of the lower frame body 6 is bent in a downward convex dogleg shape when viewed from the front, and the left and right middle portions are the vertices. A resin front grounding body 10 is fixed to this apex from below. On the other hand, the rear member 6c, which is the rear ground contact portion of the lower frame body 6, is gently curved in a forward concave shape in a plan view, and is smoothly continuous with the side member 6b. A resin-made rear grounding body 11 is fixed to the rear member 6c from below, and the rear grounding body 11 extends to the rear corner portion 6d.

As shown in FIGS. 3 (B) and 4 (A), the rear member 6c (or the rear ground contact body 11) is gently curved downward in a rear view (and front view), but the rear member 6c. The degree of bending of the front member 6a is looser than the bending angle of the front member 6a. That is, the height difference between the left and right ends of the rear member 6c is smaller than the height difference between the left and right ends of the front member 6a. Due to the difference in the shape of the lower surface between the front member 6a and the rear member 6c, the chair can be swung (tilted) to the left or right as a whole.

As shown in FIG. 4 (B), the rear corner portion 6d appears to be gently curved upward and convexly (looks warped) when viewed from the side, but is viewed from a diagonal direction as shown in FIG. 4 (C). And, it is gently curved downward. This difference in appearance is due to the fact that the rear corner portion 6d is curved in a plan view. Since the rear corner portion 6d is gently curved downward in a convex shape when viewed from the diagonal direction, the rear member 6c (rear ground contact body 11) smoothly touches the floor when the chair swings (rear ground contact body 11). In other words, the grounding point of the rear grounding body 11 with respect to the floor moves smoothly and swings.)

At the left and right ends of the front member 6a, stoppers 12 that come into contact with the floor in a fully swung state are projected downward. Therefore, the height difference between the stopper 12 and the floor is the maximum height difference of the swing. The stopper 12 is made of resin and is formed in a spherical shape, and is attached to bolts (screws) 13 provided at the left and right ends of the front member 6a by screwing. The bolt 13 uses a so-called enamel set. A metal nut is embedded in the stopper 12 by insert molding. Further, although the stopper 12 is located near the front corner portion which is the connecting portion between the front member 6a and the side member 6b, the stopper 12 can be attached to the front end portion of the side member 6b.

It is also possible to provide a blind nut or the like on the front member 6a and provide a bolt on the stopper 12. In this case, the bolt may be integrated with the stopper 12 by insert molding or the like. It is also possible to make the stopper 12 made of metal and cover it with a cushioning material such as rubber. In this case, a female screw or a male screw may be integrated with the stopper.

The rear member 6c can be formed in a trapezoidal shape in front view (and rear view), or can be bent in a dogleg shape. Alternatively, it is also possible to form the whole horizontally.

(2). Summary As mentioned above, when the seated person shakes his / her body from side to side, the chair swings from side to side, so the chair can be used as a vibrating tool to relax and relax tension and promote blood circulation. can. When both feet are placed on the front member 6a of the lower frame body 6, the swing can be performed dynamically, but since the support column 7 is tilted backward, the seated person puts his / her feet on the front member 6a of the lower frame body 6. However, the foot does not hit the support column 7, and it is easy to use.

In the present embodiment, since the degree of bending of the front member 6a is steeper than the degree of bending of the rear member 6c, the displacement amount of the front member 6a becomes larger than the displacement amount of the rear member 6c during the swing. Therefore, the seat 1 (or the seated person) moves (tilts) to the left and right and also moves forward. For this reason, a person can swing with his / her legs stretched to the floor at any time. Therefore, it is possible to swing dynamically while ensuring stability.

Further, since the stopper 12 hits the floor when the front member 6a is completely rotated, the swing angle can be accurately defined and the rotation due to inertia can be prevented. That is, a sharp swing can be realized.

Since the upper surface of the seat 1 is recessed downward to fit the seated person's body, the seat 1 does not tilt due to a slight movement of the center of gravity. Therefore, when performing work or work, the seated person can take a correct posture in a relaxed and natural state without unconsciously exerting force on the legs, and can prevent stiffness and fatigue.

On the other hand, even when actively swinging for a change of mood, for example, since the seat 1 fits the body, even if the body moves dynamically, it does not tend to be shaken off from the seat 1. You can perform swing exercise with confidence. Furthermore, since the fit can be grasped visually and it can be used without discomfort, it can be widely used for work and learning.

The stopper 12 is located at the left and right ends of the front member 6a and is noticeable, but since the stopper 12 is floating from the floor, even a person who sees this chair for the first time can immediately recognize that it is a swing type. Can be understood. Therefore, even if the chair shakes by moving the body after sitting down, the chair can be enjoyed on the contrary without being confused.

When the rear member 6c is formed in a substantially U shape in a plan view as in the present embodiment, the contact length with the floor can be lengthened, so that the swing movement can be made smooth. Further, as described above, the rear member 6c and the rear corner portion 6d are gently curved downward in a convex shape, and the ground contact point moves smoothly during the swing, so that a smooth swing motion can be realized.

By the way, as already described, the degree of bending of the rear member 6c is looser than the degree of bending of the front member 6a in the front view, and therefore, as shown in FIGS. 4A and 4C, the rear member 6c and the rear member 6c are bent. The maximum height difference H1 with the floor is smaller than the height difference H2 between the stopper 12 and the floor. In this embodiment, H2 is about 1.5 times that of H1. Due to the height difference as described above, the line 14 connecting the end of the rear ground contact body 11 and the stopper 12 is slightly inclined with respect to the floor surface.

The stopper 12 hits the floor at the final stage of the swing, but until the stopper 12 hits the floor, the chair is in a state of two-point support between the middle portion of the front member 6a and the rear ground contact body 11. Normally, the swing stops when the middle portion of the front member 6a, the end portion of the rear ground contact body 11, and the stopper 12 hit the floor and are in a three-point support state. In this case, the swing angle is defined by the stopper 12 coming into contact with the floor in a point-to-point state.

Further, since the maximum height H1 of the rear grounding body 11 (to be exact, the maximum height of the final grounding position of the rear grounding body 11 is smaller than H1) and the height H2 of the stopper 12 are different, there are two points. At the stage from support to three-point support, the chair tends to tilt toward you without tilting too much in the left-right direction. Therefore, with the rear grounding body 11 touching the floor, the stopper 12 smoothly shifts to touching the ground.

In this case, the ground contact position of the rear ground contact body 11 moves toward the rear corner portion 6d during the swing, but since the rotation fulcrum of the front end of the chair is constant at the front ground contact body 10, the chair is rotated. The center line of motion is indicated by reference numeral 16 from the complete anteroposterior longitudinal posture indicated by reference numeral 15 in FIG. 2 (B).
It shifts to the plan view tilted posture shown by. Therefore, the chair (and the body) is rotating to the front side while rotating in the left-right direction, and therefore, the stopper 12 smoothly shifts to the state of being in contact with the floor. Further, since the rear ground contact body 11 is curved in an arc in a plan view, the movement of tilting forward while moving left and right is very smooth.

As a result, when the stopper 12 comes into contact with the floor, it does not stop with a rattling feeling, and a smooth and safe swing can be realized. Further, due to the height difference between H1 and H2, the tendency to lean forward becomes stronger in the transition from the two-point support state to the three-point support state, which kills the momentum of the swing and enhances the safety. The final ground contact position height of the rear ground contact body 11 and the height of the stopper 12 may be the same, and in either case, the position of the stopper 12 may be anywhere.

Under normal use conditions, the swing stops when the stopper 12 touches the ground, but if the user shakes his / her body very much in search of more active movement, it is possible to overswing beyond the angle regulated by the stopper. be. In this overswing state, the chair and the body rotate around the line connecting the end of the rear ground contact body 11 and the stopper 12 in a two-point support state, but the rear ground contact body 11 and the stopper 12 are rotated. Since the connecting line is elongated in the front-rear direction, it rotates almost in the left-right direction. Then, when the return force due to the seated person's own weight and the kinetic energy due to the swing are balanced, the overswing stops and returns and rotates.

The invention of the present application can be embodied in various other ways. For example, the lower end portion of the leg does not have to have a frame structure as in the embodiment, and a plate-shaped form or the like can also be adopted. It is also possible to provide a support column in the middle of the legs. It can also be applied to chairs with a backrest. The stopper of the embodiment is a single structural product of resin, but the outer peripheral portion may be made of a soft material such as rubber. It is also possible to configure the left and right stoppers with a plurality of stoppers arranged side by side in the front-rear direction so that the plurality of stoppers are grounded at the same time. Alternatively, it is also possible to ground a plurality of stoppers in order.

The invention of the present application can be actually embodied in a chair. Therefore, it can be used industrially.

1 seat 2 legs 3 seat plate 6 lower frame body 6a front member of the lower frame body 6b side member of the lower frame body 6c rear member of the lower frame body 6d rear corner part 5 pillars constituting the legs 6 legs Upper frame body 7 Bracket 10 Front ground body 11 Rear ground body 12 Stopper 13 Bolt

The present invention relates to a chair that allows a seated person to swing following the movement (swinging) of the upper body.

Chairs are generally designed to sit stably on the floor, but by forming the lower end surface (contact patch) of the legs in a downward convex shape when viewed from the front, they swing left and right following the left and right movements of the seated person. As a version of the chair, the applicant of the present application discloses in Patent Document 1 a configuration in which the seat surface is recessed downward so as to imitate the roundness of the seated person's body (buttocks and thighs). bottom.

Japanese Patent Application No. 2017-97353

In recent years, the importance of worker health management in the office has been pointed out. Therefore, if a swing-type chair that has a function as an exercise tool and can contribute to a change of mood and promotion of blood circulation can be effectively used in the office, the worker Although it is beneficial for both the user and the administrator, if the seat surface is dented as in Patent Document 1, the user's physical stability is excellent and there is an image that it is easy to sit visually, so there is no discomfort even in the office. It can be said that it can be used and the range of use can be expanded.

In addition, chairs that swing back and forth as chairs for infants and the elderly have existed for a long time, but chairs that allow the seated person to actively swing left and right are novel, and the surrounding environment is softened by unexpectedness and a kind of playfulness. It also has the effect of being able to do so, and in this respect as well, it can be said that it can contribute to improving the environment such as office environment and business negotiations.

In this way, swing-type chairs have excellent effects, but when used as chairs used by unspecified people, such as chairs installed at the counters of various facilities, the swing function is known. When a person who does not come in contact with him for the first time, there is a concern that the chair may be tilted due to the movement of his body, which may cause confusion. Even if the chair is tilted, it is easy to understand that it is a chair with such a function, but it can be said that it is user-friendly if it can be visually grasped that it has a swing function in the state before use. In addition, it is safe to be able to regulate the movement due to inertia and specify the swing amount.

The present invention has been made in the wake of such a situation, and is intended to provide a more improved swing type chair.

The invention of the present application is as described in claim 1.
" It has a seat and legs to support it,
The leg has a ground contact portion and struts rising from both ends thereof.
By forming the ground contact portion in a downward convex shape in which the apex is located in the middle portion between one end and the other end, the seat and the leg can swing integrally.
The ground contact portion and the support column constituting the leg are integrally formed by bending one round pipe, and stoppers that come into contact with the floor are projected downward at both ends of the ground contact portion so as to be visible to the public. Is "
It is configured as.

The invention of the present application can be developed in various ways. As a preferred example thereof, in claim 2, claim 1
"The pair of struts rising from both ends of the ground contact portion are inclined so that the distance between them becomes narrower toward the top, and the distance between the lower ends of the pair of struts is larger than the width of the seat in the swing direction. Is becoming "
It is configured as.

Further, in claim 3, in claim 1 or 2,
"While the legs have an integrally continuous upper frame at the top of the stanchions,
The seat has a seat plate that is recessed downward in front view and a cushioning material arranged on the seat plate, and the seat plate is supported by the upper frame of the leg. "
It is configured as.

In the present invention, as in Patent Document 1, it is preferable that the upper surface (seat surface) of the seat is recessed so that the buttocks and thighs of the seated person fit (wrap around from below).

When the chair swings and is fully tilted, a large force acts as a moment on the floor. Therefore, if the end of the leg directly hits the floor, the floor may be easily damaged. However, if a stopper is provided as in the present invention, the stopper may have a cushioning function to prevent the floor from being damaged. It can be suppressed.

In addition, since the swing movement is regulated (regulated) by the stopper, it is possible to realize a sharp swing movement, and the swing amount is kept constant even if the force applied to the chair by the user is different, which is safe. .. In other words, if a downward stopper is provided, if the stopper hits the floor and then tries to swing further, it must be rotated with the stopper as a fulcrum, but this requires a very large amount of kinetic energy, so it is normally used. In the state, the swing amount is accurately defined even if the magnitude of the kinetic energy that shakes the body is different, and therefore, the swing is not excessive due to inertia.

It is possible to swing the chair further even after the stopper comes into contact with the floor by applying a very large acceleration according to the intention of the user, and the maximum swing amount in this case is the kinetic energy of the person. It will depend on the size.

Further, in the present invention, the stopper is provided in a state where it can be seen by the public, and the user can visually grasp that the chair has a swing function, so that the chair is used as a chair used by an unspecified number of people. Even so, it is possible to prevent the chair from tilting and being confused after a person sits down.

That is, because the stopper is floating from the floor, it makes the person immediately understand that the chair tilts and the stopper touches the floor, so that the person immediately understands that it is a swing type chair. It is possible to prevent a situation where you are confused after sitting down. In this case, it is more preferable to form the stopper in a conspicuous color such as red or green because the visibility is improved. It can be said that visibility is improved by using a color different from the color of the legs, especially warm colors.
With the configuration of claim 2, high stability can be ensured during a swing.

When at least the lower surface of the stopper is formed on a curved surface as in the embodiment , the stopper contacts the floor in a point contact manner even if the posture of the stopper is slightly different or the floor is uneven due to manufacturing errors or the like. A stable contact function can be ensured. That is, a stable contact state can be ensured by absorbing mounting errors and the like. Further, when the stopper is formed in a spherical shape, the stopper is in a swollen state and the surface area is increased, so that the visibility can be further improved when viewed from the front or the side of the chair.

When the method of attaching the stopper by screwing as in the embodiment is adopted, it is possible to reduce the labor of work when assembling the chair and it is easy to replace it when it is damaged. Also, if the stopper is a color different from the color of the chair, a one-point mark-like aesthetic feature will be produced, but it will be easy for the user to replace it with a different color according to his / her taste. Further, if a plurality of types of stoppers having different heights are prepared, it is possible to easily change the swing angle (to be exact, the minimum swing angle).

It is a figure showing an embodiment, (A) is a perspective view seen from the front, (B) is a perspective view seen from the back, (C) is a separated perspective view, and (D) is a perspective view seen from below. (A) is a front view and (B) is a bottom view. (A) is a side view, (B) is a rear view, and (C) is a separated perspective view of a main part. (A) is a partial front view, (B) is a partial side view, and (C) is a perspective view seen from the direction of arrow IIIC in FIG. 1 (A).

(1). Structure of First Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. In the following, the words front and back and left and right are used to specify the direction, but the front, back, left and right are based on the direction of the person who is normally seated. The front view direction is the direction facing the seated person.

As can be understood from FIG. 2, in the present embodiment, the chair includes a seat 1 and legs 2 that support the seat 1. The seat 1 includes a wooden or resin seat plate 3 and a cushion material 4 stretched on the upper surface thereof, and the cushion material 4 is covered with a skin material (not shown). The seat 1 is a substantially quadrangle in a plan view and has rounded corners.

The seat 1 (the seat plate 3 and the cushion material 4) is gently curved so as to be recessed downward in the front view, and the rear end is gently curved upward in the longitudinal side view. That is, the upper surface of the seat 1 (the upper surface of the seat plate 3 and the cushion material 4) is a concave surface that fits the curved surfaces of the buttocks and thighs of the seated person. Further, the seat 1 is generally leaning forward (may be in a horizontal posture or may be in a backward leaning posture). A belt-made pull tab 5 used for pulling and moving the chair is provided at the rear end of the seat 1.

The legs 2 are made of a round metal pipe, and are placed on the lower frame body 6 that rests on the floor, the left and right columns 7 that rise from the left and right ends of the front end of the lower frame body 6, and the upper ends of the columns 7. The upper frame body 8 provided is provided, and the bracket 9 is fixed to the upper frame body 8 and the seat plate 3 is fixed to the bracket 9. The lower end of the column 7 is located at the front end of the seat 1 in a plan view, but the upper end of the column 7 is located slightly behind the front end of the seat 1 (in front of the front / rear intermediate position of the seat 1). ing. Therefore, the column 7 is tilted backward at a gentle angle.

The lower frame body 6 has left and right horizontally long front members 6a, front and rear longitudinal left and right side members 6b, and rear members 6c connected to the rear ends of the left and right side members 6b, and has side members 6b and rear members. The rear corner portion 6d connected to the 6c is curved in a plan view. Therefore, the side member 6b and the rear member 6c are U-shaped in a plan view. A reinforcing member is fixed to the connection portion between the front member 6a and the side member 6b.

The front end of the side member 6b is welded to the front member 6a, and the columns 7 are bent and formed at both left and right ends of the front member 6a. The upper frame body 8 is formed by bending the upper end of the support column 7 backward and then bending it further inward. Therefore, the upper frame body 8 also has a U-shaped opening facing forward in a plan view as a whole. The front member 6a is a front ground contact portion.

Further, as is clearly shown in FIG. 2, the left and right end portions of the front member 6a constituting the front ground contact portion of the lower frame body 6 protrude to the left and right outside of the seat 1 in a plan view. Therefore, the distance between the lower ends of the left and right columns 7 is larger than the left-right width, which is the width of the seat 1 in the swing direction. Therefore, high stability can be ensured even when swinging, and a plurality of chairs can be stacked up and down. That is, the lower frame 6 of the upper chair can be fitted behind from between the left and right columns 7 of the lower chair, and the chairs can be stacked up and down. Therefore, it is advantageous for storage when not in use.

The bracket 9 is composed of a U-shaped frame body 9a that opens backward in a plan view and a lip 9b that projects inward from the frame body 9a, and the frame body 9a is fixed to the upper frame body 8 by welding. , The lip 9b is fixed to the seat plate 3 by a screw inserted from below. When the bracket 9 is provided as in the present embodiment, the seat 1 can be firmly fixed while the upper frame body 8 is arranged outside the seat 1. Further, since the bracket 9 projects toward the front of the upper end of the support column 7, the seat 1 can be firmly and stably fixed to the leg 2 even when the support column 7 is tilted backward.

The front member 6a of the lower frame body 6 is bent in a downward convex dogleg shape when viewed from the front, and the left and right middle portions are the vertices. A resin front grounding body 10 is fixed to this apex from below. On the other hand, the rear member 6c, which is the rear ground contact portion of the lower frame body 6, is gently curved in a forward concave shape in a plan view, and is smoothly continuous with the side member 6b. A resin-made rear grounding body 11 is fixed to the rear member 6c from below, and the rear grounding body 11 extends to the rear corner portion 6d.

As shown in FIGS. 3 (B) and 4 (A), the rear member 6c (or the rear ground contact body 11) is gently curved downward in a rear view (and front view), but the rear member 6c. The degree of bending of the front member 6a is looser than the bending angle of the front member 6a. That is, the height difference between the left and right ends of the rear member 6c is smaller than the height difference between the left and right ends of the front member 6a. Due to the difference in the shape of the lower surface between the front member 6a and the rear member 6c, the chair can be swung (tilted) to the left or right as a whole.

As shown in FIG. 4 (B), the rear corner portion 6d appears to be gently curved upward and convexly (looks warped) when viewed from the side, but is viewed from a diagonal direction as shown in FIG. 4 (C). And, it is gently curved downward. This difference in appearance is due to the fact that the rear corner portion 6d is curved in a plan view. Since the rear corner portion 6d is gently curved downward in a convex shape when viewed from the diagonal direction, the rear member 6c (rear ground contact body 11) smoothly touches the floor when the chair swings (rear ground contact body 11). In other words, the grounding point of the rear grounding body 11 with respect to the floor moves smoothly and swings.)

At the left and right ends of the front member 6a constituting the front ground contact portion, stoppers 12 that come into contact with the floor in a fully swung state are projected downward. Therefore, the height difference between the stopper 12 and the floor is the maximum height difference of the swing. The stopper 12 is made of resin and is formed in a spherical shape, and is attached to bolts (screws) 13 provided at the left and right ends of the front member 6a by screwing. The bolt 13 uses a so-called enamel set. A metal nut is embedded in the stopper 12 by insert molding. Further, although the stopper 12 is located near the front corner portion which is the connecting portion between the front member 6a and the side member 6b, the stopper 12 can be attached to the front end portion of the side member 6b.

It is also possible to provide a blind nut or the like on the front member 6a and provide a bolt on the stopper 12. In this case, the bolt may be integrated with the stopper 12 by insert molding or the like. It is also possible to make the stopper 12 made of metal and cover it with a cushioning material such as rubber. In this case, a female screw or a male screw may be integrated with the stopper.

The rear member 6c can be formed in a trapezoidal shape in front view (and rear view), or can be bent in a dogleg shape. Alternatively, it is also possible to form the whole horizontally.

(2). Summary As mentioned above, when the seated person shakes his / her body from side to side, the chair swings from side to side, so the chair can be used as a vibrating tool to relax and relax tension and promote blood circulation. can. When both feet are placed on the front member 6a of the lower frame body 6, the swing can be performed dynamically, but since the support column 7 is tilted backward, the seated person puts his / her feet on the front member 6a of the lower frame body 6. However, the foot does not hit the support column 7, and it is easy to use.

In the present embodiment, since the degree of bending of the front member 6a is steeper than the degree of bending of the rear member 6c, the displacement amount of the front member 6a becomes larger than the displacement amount of the rear member 6c during the swing. Therefore, the seat 1 (or the seated person) moves (tilts) to the left and right and also moves forward. For this reason, a person can swing with his / her legs stretched to the floor at any time. Therefore, it is possible to swing dynamically while ensuring stability.

Further, since the stopper 12 hits the floor when the front member 6a is completely rotated, the swing angle can be accurately defined and the rotation due to inertia can be prevented. That is, a sharp swing can be realized.

Since the upper surface of the seat 1 is recessed downward to fit the seated person's body, the seat 1 does not tilt due to a slight movement of the center of gravity. Therefore, when performing work or work, the seated person can take a correct posture in a relaxed and natural state without unconsciously exerting force on the legs, and can prevent stiffness and fatigue.

On the other hand, even when actively swinging for a change of mood, for example, since the seat 1 fits the body, even if the body moves dynamically, it does not tend to be shaken off from the seat 1. You can perform swing exercise with confidence. Furthermore, since the fit can be grasped visually and it can be used without discomfort, it can be widely used for work and learning.

The stopper 12 is located at the left and right ends of the front member 6a and is noticeable, but since the stopper 12 is floating from the floor, even a person who sees this chair for the first time can immediately recognize that it is a swing type. Can be understood. Therefore, even if the chair shakes by moving the body after sitting down, the chair can be enjoyed on the contrary without being confused.

When the rear member 6c is formed in a substantially U shape in a plan view as in the present embodiment, the contact length with the floor can be lengthened, so that the swing movement can be made smooth. Further, as described above, the rear member 6c and the rear corner portion 6d are gently curved downward in a convex shape, and the ground contact point moves smoothly during the swing, so that a smooth swing motion can be realized.

By the way, as already described, the degree of bending of the rear member 6c is looser than the degree of bending of the front member 6a in the front view, and therefore, as shown in FIGS. 4A and 4C, the rear member 6c and the rear member 6c are bent. The maximum height difference H1 with the floor is smaller than the height difference H2 between the stopper 12 and the floor. In this embodiment, H2 is about 1.5 times that of H1. Due to the height difference as described above, the line 14 connecting the end of the rear ground contact body 11 and the stopper 12 is slightly inclined with respect to the floor surface.

The stopper 12 hits the floor at the final stage of the swing, but until the stopper 12 hits the floor, the chair is in a state of two-point support between the middle portion of the front member 6a and the rear ground contact body 11. Normally, the swing stops when the middle portion of the front member 6a, the end portion of the rear ground contact body 11, and the stopper 12 hit the floor and are in a three-point support state. In this case, the swing angle is defined by the stopper 12 coming into contact with the floor in a point-to-point state.

Further, since the maximum height H1 of the rear grounding body 11 (to be exact, the maximum height of the final grounding position of the rear grounding body 11 is smaller than H1) and the height H2 of the stopper 12 are different, there are two points. At the stage from support to three-point support, the chair tends to tilt toward you without tilting too much in the left-right direction. Therefore, with the rear grounding body 11 touching the floor, the stopper 12 smoothly shifts to touching the ground.

In this case, the ground contact position of the rear ground contact body 11 moves toward the rear corner portion 6d during the swing, but the rotation fulcrum of the front end of the chair is constant at the front ground contact body 10, so that the chair is rotated. The moving center line shifts from the complete anteroposterior longitudinal posture shown by reference numeral 15 in FIG. 2B to the plan-view tilted posture shown by reference numeral 16. Therefore, the chair (and the body) is rotating to the front side while rotating in the left-right direction, and therefore, the stopper 12 smoothly shifts to the state of being in contact with the floor. Further, since the rear ground contact body 11 is curved in an arc in a plan view, the movement of tilting forward while moving left and right is very smooth.

As a result, when the stopper 12 comes into contact with the floor, it does not stop with a rattling feeling, and a smooth and safe swing can be realized. Further, due to the height difference between H1 and H2, the tendency to lean forward becomes stronger in the transition from the two-point support state to the three-point support state, which kills the momentum of the swing and enhances the safety. The final ground contact position height of the rear ground contact body 11 and the height of the stopper 12 may be the same.

Under normal use conditions, the swing stops when the stopper 12 touches the ground, but if the user shakes his / her body very much in search of more active movement, it is possible to overswing beyond the angle regulated by the stopper. be. In this overswing state, the chair and the body rotate around the line connecting the end of the rear ground contact body 11 and the stopper 12 in a two-point support state, but the rear ground contact body 11 and the stopper 12 are rotated. Since the connecting line is elongated in the front-rear direction, it rotates almost in the left-right direction. Then, when the return force due to the seated person's own weight and the kinetic energy due to the swing are balanced, the overswing stops and returns and rotates.

The invention of the present application can be embodied in various other ways. For example, it can be applied to a chair with a backrest . The stopper of the embodiment is a single structural product of resin, but the outer peripheral portion may be made of a soft material such as rubber. It is also possible to configure the left and right stoppers with a plurality of stoppers arranged side by side in the front-rear direction so that the plurality of stoppers are grounded at the same time. Alternatively, it is also possible to ground a plurality of stoppers in order.

The invention of the present application can be actually embodied in a chair. Therefore, it can be used industrially.

1 seat 2 legs 3 seat plate 6 lower frame body 6a front member constituting the front ground contact part of the lower frame body 6b side member of the lower frame body 6c rear member of the lower frame body 6d rear corner part
Supports that make up 7 legs
Upper frame that constitutes 8 legs
9 Bracket 10 Front grounding body 11 Rear grounding body 12 Stopper 13 Bolt

Claims (4)

It is provided with a seat and legs that support it, and by forming the lower end surface of the legs in a downward convex shape in front view with the apex located in the middle left and right, the seat and legs are integrated to the left and right. It is a configuration that can swing to
Stoppers that come into contact with the floor are projected downward on both the left and right sides of the lower end surface of the leg.
Chair. The lower end of the leg resting on the floor has a horizontally long front member and left and right side members extending rearward from both left and right ends thereof, and the stopper is a corner where the front member and the side member are connected to each other. It is placed in or near the part in an exposed state so that it can be seen by the public.
The chair according to claim 1. At least the lower surface of the stopper is formed into a rounded curved surface.
The chair according to claim 1 or 2. The stopper is attached to a bolt or nut provided on the leg by screwing.
The chair according to any one of claims 1 to 3.

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