JP7345189B2 - Chair - Google Patents

Description

The present invention relates to a chair that is used in combination with a table or desk (hereinafter referred to as a table) with its legs placed on the floor or the like.

Chairs used in combination with tables include dining chairs, work chairs, and study chairs. Such chairs include ordinary chairs with legs that touch the floor at the bottom of the seat, swivel chairs with a seat that can rotate relative to the legs in a horizontal plane, and legs of swivel chairs. Conventionally, chairs with casters, which have swivel casters attached to the tip of the chair, have been common.
To establish your seating position when sitting on one of these conventional chairs, you must pull the chair back and sit away from the table, then, while still seated, shift your weight slightly forward and pull the entire chair back toward the table. Move closer. In some cases, it may be necessary to subtly move the chair back and forth many times to achieve the appropriate distance between the edge of the table and the seated person. Such a sitting operation is a troublesome operation. In particular, if the frictional resistance between the chair legs and the floor is large, this sitting motion becomes more difficult, and the user may have no choice but to give up halfway (for example, when the floor is a carpet or carpet). Furthermore, the seating position changed slightly each time the person sat down, and the reproducibility of the appropriate position could not be guaranteed. Similarly, in order to leave a chair, your body will interfere with the edge of the table if the chair is still in place, so first move your weight slightly backwards while sitting, and pull the entire chair back. This requires the cumbersome action of moving the patient away from the chair and then standing up from the chair. These movements are often very difficult for elderly people, people with disabilities (sick people, disabled people), and pregnant women, and a caregiver needs to assist them in moving the chair. When using a rotating chair or a chair with casters, the presence of a caregiver is essential because of the safety issues described below. In other words, when using a rotating chair, for example, if the seated person attempts to leave the seat by simply rotating the chair, the arm of the seated person may interfere with an object placed on the table or the edge of the table, or the seated person may stand up. This is because there is a safety problem in that the seated person's body may interfere with the edge of the table. Even when using a chair with casters, once the person sitting on the chair stands up, the chair may move backwards as the person's legs extend, and when the person tries to sit down again, the seat may become detached, causing the person to fall. This is because there are safety issues such as.
These problems caused by the conventional chairs mentioned above are something that everyone frequently encounters in their daily life, such as eating, desk work such as office work and light work, reading, and studying, and cannot be avoided. This is expected to cause negative effects such as reduced work efficiency, increased stress, poor posture, health problems, and injuries. These negative effects are more serious when chairs are used by elderly people, people with impaired health (sick people, disabled people), and pregnant women, and the above-mentioned problem is an important issue to be solved.
In order to solve the above-mentioned problem, the following prior art document discloses a chair in which the seat portion can both rotate and move back and forth relative to the legs in a horizontal plane.

Publication No. 55-9225 Japanese Patent Application Publication No. 2001-8773 Utility model registration No. 3139480 Utility model registration No. 3127136 JP2018-23569A

Each of the chairs disclosed in the above five prior documents is configured so that the seat can be rotated and moved back and forth independently, so that when sitting down or leaving the seat, the seated person can sit on the chair while remaining seated. At first glance, it seems that sitting and leaving the seat is easier than before, as there is no need to move the entire body back and forth.
However, the motion of the seated person rotating the seat and the motion of the seated person moving the seat back and forth involve completely different uses of the seated person's muscles. In the former case, the movement involves twisting the hips while pressing on the soles of the feet that are on the floor; in the latter case, the movement involves thrusting the hips forward in a manner that shifts the weight slightly forward while pressing on the soles of the feet that are on the floor ( or pulling the hips back so as to shift the weight slightly backward). That is, when sitting down or leaving the seat, the seated person has to perform two steps: rotating the seat and moving the seat back and forth, which is troublesome. Also, similar to swivel chairs, there are safety issues such as, for example, if a user carelessly attempts to leave the seat by simply rotating the chair, the arm or body may interfere with an object on the table or the edge of the table. . Although it is useful as a dedicated nursing chair that requires the presence of a caregiver in the sense that it can be operated more easily by the caregiver, it is not suitable as a chair for elderly people, people with disabilities, or pregnant women to use independently.
The present invention solves the above problems.

The chair of the present invention is
A chair used in combination with a table,
a leg having at least a leg;
SaidA seat provided above the legs;
Saidagainst the legsSaidThe seat isFrom a seated position where a seated person sitting on the seat faces the table, clockwise and counterclockwise to a predetermined angle within one plane,It can be rotated around the center line P, andSaidagainst the legsSaidThe seat isSlide within the plane from the seating position to a predetermined distance in a direction approaching the center line P.A rotating slide mechanism that allows
Saida stationary shaft provided perpendicular to the plane so as to be integral with the leg;Saida movement axis provided perpendicular to the plane so as to be integrated with the seat;Saidstationary axis andSaidA link mechanism whose main components include a link connecting the moving axis,
Equipped with
SaidDue to the link mechanism,While the seat rotates from the seating position to the predetermined angle, the seat slides from the seating position to the predetermined distance.likeSaidof the seatslideandSaidIn conjunction with the rotation of the seat,
In the seating position, in a direction from the table to the seat,SaidThe center line R of the moving axis,SaidThe center line Q of the stationary axis,SaidThe center lines P are arranged in order on a straight line,
SaidCenter line P andSaidIt is characterized in that the relative positions of the legs remain unchanged.

According to the present invention, by simply rotating the seat without moving the entire chair, the seated person automatically approaches the table safely when taking a seat, and automatically moves away from the table when leaving the seat. It becomes possible to leave safely.

FIG. 1 is a perspective view of a chair according to a first embodiment of the present invention. FIG. 1 is a front view of a chair according to a first embodiment of the present invention. 1 is a longitudinal cross-sectional view (A-A' cross-sectional view) of a chair according to a first embodiment of the present invention. FIG. 1 is an exploded perspective view of a chair according to a first embodiment of the present invention. 1 is a combination layout diagram (vertical cross-sectional view) of a chair and a table according to a first embodiment of the present invention; FIG. FIG. 2 is a combination layout diagram (plan view) of a chair and table according to the first embodiment of the present invention, and rotation accompanying movement of the seat plate from the seated position to the unseated position when the seated person performs a left rotation motion. FIG. 3 is a diagram for explaining the movement of the slide mechanism. FIG. 2 is a combination layout diagram (plan view) of a chair and table according to the first embodiment of the present invention, and rotation due to movement of the seat plate from the seated position to the unseated position when the seated person performs a clockwise rotation motion. FIG. 3 is a diagram for explaining the movement of the slide mechanism. FIG. 7 is a diagram for explaining the movement of the rotary slide mechanism accompanying movement of the seat plate and the relationship between the rotation angle θ and the slide distance S when the seated person performs a counterclockwise rotation motion shown in FIG. 6 . It is a front view of the chair concerning the modification of the 1st embodiment of the present invention. FIG. 3 is a longitudinal sectional view (A-A' sectional view) of a chair according to a modification of the first embodiment of the present invention. It is an exploded perspective view of the chair concerning the modification of the 1st embodiment of the present invention. It is a front view of the chair concerning the 2nd embodiment of the present invention. FIG. 3 is a longitudinal sectional view (A-A' sectional view) of a chair according to a second embodiment of the present invention. FIG. 3 is an exploded perspective view of a chair according to a second embodiment of the present invention. It is an exploded perspective view of the rotation slide mechanism of the chair concerning the 2nd embodiment of the present invention. FIG. 6 is a combination layout diagram (longitudinal cross-sectional view) of a chair and a table according to a second embodiment of the present invention. It is a combination layout diagram (plan view) of a chair and a table according to a second embodiment of the present invention, and the rotation accompanying the movement of the seat plate from the seated position to the unseated position when the seated person performs a counterclockwise rotation motion. FIG. 3 is a diagram for explaining the movement of the slide mechanism. FIG. 7 is a longitudinal sectional view of a chair according to a third embodiment of the present invention. FIG. 7 is an exploded perspective view of a chair according to a third embodiment of the present invention. It is a combination layout diagram (plan view) of a chair and a table according to a third embodiment of the present invention, and rotation accompanying movement of the seat plate from the seated position to the unseated position when the seated person performs a counterclockwise rotation motion. FIG. 3 is a diagram for explaining the movement of the slide mechanism.

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the disclosure is merely an example, and any modifications that can be easily made by those skilled in the art while maintaining the gist of the invention are naturally included within the scope of the present invention. In addition, in order to make the explanation clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual aspect, but this is just an example and does not limit the interpretation of the present invention. It's not something you do. In addition, in this specification and each figure, the same elements as those described above with respect to the previously shown figures are denoted by the same reference numerals, and detailed explanations may be omitted as appropriate.

(First embodiment)
Hereinafter, the chair according to the first embodiment will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a chair according to a first embodiment of the invention. Figure 2
1 is a front view of a chair according to a first embodiment of the present invention. FIG. 3 is a longitudinal sectional view (AA' sectional view) of the chair according to the first embodiment of the present invention. FIG. 4 is an exploded perspective view of the chair according to the first embodiment of the invention.
As shown in FIGS. 1 to 4, the chair 1 includes legs 10, a seat 20, and a rotation slide mechanism 40 that allows the seat 20 to rotate and move horizontally relative to the legs 10. .

The leg portion 10 includes four legs 11 and a leg support portion 12 that fixedly supports the four legs 11. The seat portion 20 includes a seat plate 22, a seat cushion 21 installed on the upper surface of the seat plate 22, and a back portion 24 fixed to the seat plate 22.
The rotary slide mechanism 40 includes a support plate 41 having a horizontally disposed bottom plate 46, an upper surface disposed opposite to the bottom surface of the bottom plate 46, and a cylindrical portion 42 protruding in the horizontal direction. It has two guide parts 45 attached in parallel so as to sandwich the part 42, and a slip-off prevention cover 44 attached to the guide parts 45. The fall-off prevention cover 44 has an L-shaped angle shape, and the upper surface of the fall-off prevention cover 44 is fixed to the lower surface of the cylindrical portion 42 of the support plate 41 so as to face it with a gap of about 1 mm. Therefore, the slip-off prevention cover 44 can prevent the bottom plate 46 from shaking or coming off from the support plate 41 during use. In this embodiment, the diameter of the cylindrical portion 42 is 250 mm.

In this embodiment, the material constituting the bottom plate 46, the support plate 41, and the guide component 45 is wood.
As a friction reducing element 51 that reduces the frictional resistance between the bottom plate 46 and the support plate 41, a fluororesin-based lubricant is applied to the lower surface of the bottom plate 46 and the upper surface of the support plate 41. Various spray agents are commercially available as fluororesin-based lubricants. As the lubricant, in addition to fluororesin-based lubricants, other lubricants such as silicone resin-based spray or wax can also be used. By using these lubricants, the sliding friction resistance between the bottom plate 46 and the support plate 41 can be reduced.

The rotary slide mechanism 40 further includes a stationary shaft 61 fixed perpendicularly to the periphery of the surface of the cylindrical portion 42 of the support plate 41 on the side opposite to the bottom plate 46, and a stationary shaft 61 fixed perpendicularly to the bottom plate 46. It includes a moving shaft 62 and a link 63 connecting the stationary shaft 61 and the moving shaft 62. The moving shaft 62 is arranged on a circumference 300 having a radius L2 centered on the center line (in other words, the center line of rotation) P of the cylindrical portion 42 . In this embodiment, the radius L2 is 230 mm. Further, the distance L1 between the stationary shaft 61 and the moving shaft 62 is 115 mm. Two through holes formed at both ends of the link 63 are fitted into a stationary shaft 61 and a moving shaft 62, respectively. The distance between the centers of the two through holes is 115 mm. A circumferential groove is provided at the upper ends of the stationary shaft 61 and the moving shaft 62, and a retaining ring 64 is attached to prevent the link 63 from coming off. A link mechanism 60 is composed of a stationary shaft 61, a moving shaft 62, a link 63, and a retaining ring 64.

Note that a stopper 47 is fixed to a predetermined position on the lower surface of the bottom plate 46 near the moving shaft 62.
In this embodiment, the bottom plate 46 of the rotary slide mechanism 40 is attached to the lower surface of the seat plate 22, and the support plate 41 is attached to the upper surface of the leg support section 12.

The assembly procedure is shown below. First, the completed leg portion 10, seat portion 20, and rotating slide mechanism 40 are prepared. Next, the screws fixing the fall-off prevention cover 44 of the rotary slide mechanism 40 are removed, and the fall-off prevention cover 44 is removed. Furthermore, the retaining ring 64 attached to the tip of the moving shaft 62 is removed, and the support plate 41 to which the stationary shaft 61 and link 63 are still attached is removed. Next, the bottom plate 46 of the remaining rotation/slide mechanism 40 is screwed to the lower surface of the seat plate 22 to complete the assembly 1. Next, the support plate 41 with the stationary shaft 61 and link 63 still attached is screwed onto the upper surface of the leg support part 12 to complete the assembly 2. Next, assembly 1 and assembly 2 are assembled so that the cylindrical part 42 is just sandwiched between the two guide parts 45. Next, the moving shaft 62 is fitted into the through hole of the link 63, and the retaining ring 64 is attached to the circumferential groove at the upper end of the moving shaft 62. Finally, the removal prevention cover 44 is screwed to each of the two guide components 45 from the side, thereby completing the assembly.

The leg portion 10, the seat portion 20, and the rotary slide mechanism 40 can be completed independently as three unit parts, and can be distributed separately. This point can be used as an advantage. For example, a manufacturer who manufactures a final product can have different manufacturers manufacture unit parts, so it is easy to realize cost reductions due to competitive effects. Further, a manufacturer capable of manufacturing a rotary slide mechanism can propose the chair of the present invention to a plurality of chair manufacturers and start a new business of supplying rotary slide mechanisms.

As shown in the plan views of FIGS. 6 and 7, in the seated position, from the front to the rear, the center line R of the moving shaft 62, the center line Q of the stationary shaft 61, and the center line of the cylindrical portion 42 (in other words, the center line of the rotational axis The center lines) P are arranged in order on a straight line (on the center line 200 of the chair). In the plan view of FIG. 6, along the center line 200 of the chair, the direction from the seat 20 toward the table 100 is the front, and the direction from the table 100 toward the seat 20 is the rear. The leg support section 12 and the seat section 20 are connected in a horizontal plane via a link mechanism 60 composed of a stationary shaft 61, a moving shaft 62, a link 63, and a retaining ring 64, and the rotation of the seat section 20 and the seat section 20 horizontal movement movements are linked. The seat portion 20 can be smoothly rotated/slided clockwise (clockwise) and leftward (counterclockwise) from the initial rotational position facing forward.

FIG. 5 shows a state in which the chair 1 is placed in a seating position facing the table 100. In order to establish an appropriate distance between the edge of the table 100 and the seated person and to determine the seated position, it is possible to move the chair position little by little and check the seated position each time. Alternatively, for the first time only, it is possible to pull the entire chair 1 forward while sitting, as in the conventional method, or, depending on the case, to move it delicately back and forth many times. This movement can also be performed by a caregiver.

How the rotation of the seat 20 and the movement of the seat 20 back and forth are linked will be explained with reference to FIGS. 6 and 7.
FIG. 6 is a plan view for explaining movement of the seat portion 20 from the seated position to the unseated position in FIG. 5. For ease of understanding, only the seat plate 22 and the rotating slide mechanism 40 are shown in the drawing. The seat plate 22 in the seated position is indicated by a solid line, the rotary slide mechanism 40 in the seated position is indicated by a broken line, and the seat plate 22 in the unseated position and the rotary slide mechanism 40 in the unseated position are indicated by a chain double-dashed line. . Since the cylindrical portion 42 remains unchanged between the seated position and the unseated position, it is shown as a broken line. When a seated person who is sitting in a seated position wants to leave the table 100, he or she can move to the seated position by fixing the soles of their feet on the floor and twisting their hips. FIG. 6 shows a case in which the user performs an action of twisting the waist in the counterclockwise rotation direction. Due to this twisting action, the seat plate 22 attempts to rotate to the left, but since the moving shaft 62 is pulled from the stationary shaft 61 via the link 63, the seat plate 22 moves toward the rotation center P on the rotating slide mechanism 40. Slide by distance S.

In this embodiment, the sliding distance S when the seat plate 22 rotates about 60 degrees is about 115 mm. When the sliding distance S reaches 115 mm, the cylindrical portion 42 hits the stopper 47, and the bottom plate 46 and the seat plate 22 fixed thereto are prevented from sliding any further. This movement of the seat plate 22 is realized smoothly without the seated person being aware of it, so that the seated person does not feel bothered at all. In FIG. 6, it is possible to smoothly move the seat plate 22 to the unseat position by rotating the seat plate 22 to the left by about 60 degrees. While the seat plate 22 is rotating, the seat plate 22 gradually moves away from the table 100, so that the arms of the seated person do not interfere with the edge of the table 100 or an object placed on the table 100, as in a conventional rotating chair. There's nothing left to do. At the unseated position, sufficient space is secured between the seat portion 20 and the table 100, so that the seated person can easily stand up and leave the seat.

FIG. 7 is a plan view for explaining the movement of the seat plate 22 from the seated position to the unseat position in FIG. ing. Similar to FIG. 6, the sliding distance S when the seat plate 22 rotates about 60 degrees is about 115 mm. When the sliding distance S reaches 115 mm, the cylindrical portion 42 hits the stopper 47, and the bottom plate 46 and the seat plate 22 fixed thereto are prevented from sliding any further. It is possible to smoothly move the seat plate 22 to the unseat position by rotating the seat plate 22 to the right by about 60 degrees. While the seat plate 22 is rotating, the seat plate 22 gradually moves away from the table 100, so that the arms of the seated person do not interfere with the edge of the table 100 or an object placed on the table 100, as in a conventional rotating chair. There's nothing left to do. At the unseated position, sufficient space is secured between the seat portion 20 and the table 100, so that the seated person can easily stand up and leave the seat.

FIG. 8 is a diagram for explaining the movement of the rotary slide mechanism 40 accompanying the movement of the seat plate 22 and the relationship between the rotation angle θ and the slide distance S when the seated person rotates to the left, as shown in FIG. It is a diagram. This shows a case where the seated person twists his or her hips in the counterclockwise direction from the seated position to reach the unseat position. Regarding the triangle PQR' when the user leaves the seat, the distance x between PR' is expressed as follows using θ, L1, and L2.
x=(L2-L1)・cosθ+(L1 ² −((L2-L1)・sinθ) ² ) ^0.5 holds true.
Therefore, the sliding distance S=L2−x is
It is expressed as follows using θ, L1, and L2.
S=L2-(L2-L1)・cosθ-(L1 ² -((L2-L1)・sinθ) ² ) ^0.5
The above relationship between θ and S is the basis not only of the chair according to the first embodiment but also of the present invention.

As shown in the plan views of FIGS. 6 and 7, in the seated position, the link mechanism is arranged in a straight line in the front-rear direction (on the center line 200 of the chair), so the seat 20 can be moved forward and backward toward the table 100. is restrained from moving in any direction. Therefore, there is no fear that the seat portion 20 will inadvertently move back and forth while the user is seated.
Furthermore, even if the user repeats the movement of leaving and sitting down many times, the original seating position will not shift. That is, it is possible to reliably and easily reproduce the seating position once determined.

From the above, the rotation of the seat 20 and the movement of the seat 20 back and forth can be realized in conjunction with each other only by the action of the seated person rotating the seat 20, and the action of rotating the seat 20 and the movement of the seat 20 back and forth can be achieved in conjunction with each other. It is possible to realize a chair that eliminates the inconvenience of the prior art of having to carry out the movement operation in two steps.
By simply rotating the seat without moving the entire chair, the seated person can automatically approach the table safely when taking a seat, and automatically move away from the table when leaving the seat. can do.

In addition, in order to reduce the frictional resistance between the bottom plate 46 and the support plate 41, a lubricant is applied to the bottom surface of the bottom plate 46 and the top surface of the support plate 41 as a friction reducing element 51, but this is a part of maintenance during use. However, it is preferable to periodically apply lubricant to prevent the lubricant from running out.
In addition, since there is frictional resistance between the guide component 45 and the cylindrical portion 42, in order to reduce this friction, the surface of the cylindrical portion 42 in contact with the guide component 45 and the surface of the guide component 45 in contact with the cylindrical portion 42 are also coated. A similar lubricant may also be applied. Similarly, since there is frictional resistance between the slip-off prevention cover 44 and the cylindrical portion 42, in order to reduce this friction, the upper surface of the cylindrical portion 42 in contact with the slip-off prevention cover 44 and the top surface of the cylindrical portion 42 in contact with the cylindrical portion 42 of the slip-off prevention cover 44 are A similar lubricant may also be applied to the surface.

In order to reduce the frictional resistance between the guide part 45 and the cylindrical part 42, a sliding friction reinforcing member made of a rubber sheet or the like is provided on the surface of the cylindrical part 42 in contact with the guide part 45 or the surface of the guide part 45 in contact with the cylindrical part 42. You can also attach it. At first glance, it seems strange to use a sliding friction enhancing member to reduce frictional resistance, but this will be explained with reference to FIG. 6. In FIG. 6, when the seated person puts both feet on the floor and twists his or her hips to rotate the seat 20 to the left, the seated person's buttocks push the seat cushion 21 to the right, so that the seat cushion 21 is integrated with the seat plate 22. The attached bottom plate 46 is also pushed out to the right. Therefore, the cylindrical portion 42 of the support plate 41 is pressed against the guide component 45 attached to the bottom plate 46 and located on the left side. When the viewpoint is placed on the seat part 20 that rotates to the left, the cylindrical part 42 rotates to the left and slides forward while being pressed against the left guide component 45 (actually, the bottom plate 46 rotates to the left). (while sliding backwards). The two left and right guide parts 45 are arranged in parallel so as to sandwich the cylindrical part 42 therebetween.

The left and right gaps between the two guide parts 45 are set to be larger than the diameter of the cylindrical part 42 by about 0.5 mm to 2 mm, so when the cylindrical part 42 is pressed against the left guide part 45, the cylindrical part 42 will move to the right side. It does not come into contact with the guide part 45 of. That is, the cylindrical portion 42 relatively slides forward while rotating to the left while contacting the left guide component 45, like a car tire rolling on a road. At this time, the higher the friction coefficient between the cylindrical part 42 and the guide component 45, the more efficiently the cylindrical part 42 can slide forward. For example, by pasting a rubber sheet on the inner surface of the guide component 45 that sandwiches the cylindrical portion 42 and arranging it in parallel with the cylindrical portion 42 sandwiched therebetween with a gap of about 0.5 mm to 2 mm, unnecessary frictional resistance can be reduced. can do.

(Modified example of the first embodiment)
Next, a modification of the first embodiment will be described with reference to FIGS. 9 to 11.
FIG. 9 is a front view of a chair according to a modification of the first embodiment of the invention. FIG. 10 is a longitudinal sectional view (AA' sectional view) of a chair according to a modification of the first embodiment of the present invention. FIG. 11 is an exploded perspective view of a chair according to a modification of the first embodiment of the present invention.

Unlike the first embodiment, in this embodiment, as one of the friction reducing elements 51 that reduce the frictional resistance between the bottom plate 46 and the support plate 41, on the surface of the support plate 41 facing the bottom plate 46, Four sliding friction reducing members (A) 43 are attached. The sliding friction reducing member (A) 43 is a laminated resin disk whose surface is made of fluororesin or ultra-high density polyethylene resin. The edge around the laminated resin disk is rounded. As another friction reducing element 51, a sliding friction reducing member (B) 48 is attached to the surface of the bottom plate 46 facing the support plate 41.
The sliding friction reducing member (B) 48 is a laminated resin sheet whose surface is made of fluororesin or ultra-high density polyethylene resin.
In addition, in order to further reduce the frictional resistance between the bottom plate 46 and the support plate 41, the surfaces of the sliding friction reducing member (A) 43 and the sliding friction reducing member (B) 48 are coated with the material used in the first embodiment. It is effective to apply a lubricant similar to the one used.
Even in the modification of the first embodiment described above, the same effects as in the first embodiment can be obtained.

Furthermore, since there is frictional resistance between the guide component 45 and the cylindrical portion 42, in order to reduce this friction, sliding friction is applied to the surface of the cylindrical portion 42 that is in contact with the guide component 45 or the surface of the guide component 45 that is in contact with the cylindrical portion 42. A reduction member (C) may also be attached. Similarly, since there is frictional resistance between the slip-off prevention cover 44 and the cylindrical portion 42, in order to reduce this friction, the upper surface of the cylindrical portion 42 in contact with the slip-off prevention cover 44 and the top surface of the cylindrical portion 42 in contact with the cylindrical portion 42 of the slip-off prevention cover 44 are A sliding friction reducing member (C) may also be attached to the surface. The sliding friction reducing member (C) uses a laminated resin whose surface is made of fluororesin or ultra-high density polyethylene resin, or other resin such as epoxy resin, PBT, PP, PC, PEEK, nylon, or hard vinyl chloride resin. be able to.
In order to reduce the frictional resistance between the guide part 45 and the cylindrical part 42, a sliding friction reinforcing member made of a rubber sheet or the like is provided on the surface of the cylindrical part 42 in contact with the guide part 45 or the surface of the guide part 45 in contact with the cylindrical part 42. As described in the description of the first embodiment, it may be attached.

In this embodiment, four sliding friction reducing members (A) 43 are used, but three or five or more may be used.
In this embodiment, the sliding friction reducing member (A) 43 forms a convex portion, and the sliding friction reducing member (B) 48 forms a flat surface, but conversely, the sliding friction reducing member (A) 43 forms a flat surface. The sliding friction reducing member (B) 48 may form a convex portion, or the sliding friction reducing member (A) 43 and the sliding friction reducing member (B) 48 may both form a flat surface. Further, the shape, size, and number of the convex portions are not limited to those in this embodiment, and any design may be used.
In this embodiment, the sliding friction reducing member (A) 43 and the sliding friction reducing member (B) 48 are made of a laminated resin material whose surface is made of fluororesin or ultra-high density polyethylene resin. Similar effects can be obtained by using other resins such as , PC, PEEK, nylon, and hard vinyl chloride resin.

In this embodiment, the sliding friction reducing member (A) 43 and the sliding friction reducing member (B) 48 are used at the same time, but the same effect can be obtained by using either one of them.
The combinations of materials constituting the support plate 41, the guide component 45, the bottom plate 46, the lubricant, the sliding friction reducing member (A), and the sliding friction reducing member (B) are the same as those in the embodiments described above. There is no limitation, and any combination that can realize smooth rotation/sliding movement of the seat portion 20 can be adopted.
In addition to the sliding friction reducing member described above, the friction reducing element 51 that reduces the frictional resistance between the bottom plate 46 and the support plate 41 may be any rolling mechanism such as a swivel caster or a ball surrounded by a guide. It can also be adopted.

(Second embodiment)
Next, a chair according to a second embodiment will be described below with reference to the drawings. In this embodiment, the same reference numerals are given to the same functional parts as in the first embodiment, and detailed explanation thereof will be omitted.
FIG. 12 is a front view of a chair according to a second embodiment of the invention. FIG. 13 is a longitudinal sectional view showing a chair according to a second embodiment of the invention. FIG. 14 is an exploded perspective view of a chair according to a second embodiment of the invention. FIG. 15 is an exploded perspective view of a rotating and sliding mechanism for a chair according to a second embodiment of the present invention.
FIG. 16 is a combination layout diagram (vertical sectional view) of a chair and a table according to the second embodiment of the present invention. FIG. 17 is a combination layout diagram (plan view) of a chair and table according to the third embodiment of the present invention, and shows the movement of the seat board from the seated position to the unseated position when the seated person rotates to the left. It is a figure for explaining the movement of the rotation slide mechanism accompanying movement.

Unlike the chair of the first embodiment, the rotary slide mechanism 40 in this embodiment is a combination of a mutually independent rotary mechanism 52 and slide mechanism 30.
As shown in FIGS. 12 to 15, the chair 1 includes legs 10, a seat 20, a slide mechanism 30 for horizontally moving the seat 20 relative to the legs 10, and A rotation mechanism 52 is provided for making the seat portion 20 rotatable.
The slide mechanism 30 includes a pair of rails 35 and a vehicle body 32 provided with wheels 33 at both ends so as to run on the pair of rails 35. A pair of rails 35 on which the vehicle body 32 runs are fixed to the upper surface of the bottom plate 46, and a pair of rail side plates 36 are further attached to surround the rails. A slip-off prevention cover 44 is attached to each of the pair of rail side plates 36. The vehicle body 32 is a stationary part A of the slide mechanism 30, and the bottom plate 46, rail 35, rail side plate 36, and slip-off prevention cover 44 are sliding parts of the slide mechanism 30. The rotation mechanism 52 includes a base plate 54 and a top plate 53 rotatably connected and installed on the base plate 54. In this embodiment, a commercially available rotating plate is used. The base plate 54 is a stationary part B of the rotating mechanism 52, and the top plate 53 is a rotating part of the rotating mechanism 52.

The slip-off prevention cover 44 has an L-shaped angle shape, and is fixed to the lower surface of the wheel 33 so as to face it with a gap of about 1 mm. Therefore, the fall-off prevention cover 44 can prevent the vehicle body 32 from shaking or coming off from the bottom plate 46 during use. The base plate 54 is attached to the upper surface of the leg support part 12, and the top plate 53 is attached to the lower surface of the vehicle body 32. The upper surface of the bottom plate 46 is attached to the lower surface of the seat plate 22.
The chair 1 further includes a moving shaft 62 fixed perpendicularly to the lower surface of the seat plate 22, a stationary shaft 61 provided on the upper surface of the leg support 12, and a link 63 connecting the stationary shaft 61 and the moving shaft 62. Equipped with The moving shaft 62 is arranged on a circumference 300 having a radius L2 centered on the center line P of rotation of the seat portion 20. In this embodiment, the radius L2 is 230 mm. Further, the distance L1 between the stationary shaft 61 and the moving shaft 62 is 115 mm. Two through holes formed at both ends of the link 63 are fitted into a stationary shaft 61 and a moving shaft 62, respectively. The distance between the centers of the two through holes is 115 mm. Circumferential grooves are provided at the distal ends of the stationary shaft 61 and the moving shaft 62, and a retaining ring 64 is attached to prevent the link 63 from coming off.

As shown in the plan view of FIG. 17, in the seated position, from the front to the rear, the center line R of the moving shaft 62, the center line Q of the stationary shaft 61, and the center line P of rotation are on a straight line (the center of the chair (on line 200). The leg portion 10 and the seat portion 20 are connected in a horizontal plane via a link mechanism composed of a stationary shaft 61, a moving shaft 62, a link 63, and a retaining ring 64. The movement is linked to the forward and backward movements. A stopper 47 that prevents movement of the vehicle body 32 is fixed to a predetermined position on the lower surface of the bottom plate 46 near the moving shaft 62.
How the rotational movement of the seat 20 and the back and forth movement of the seat 20 are linked will be described with reference to FIGS. 16 and 17.
FIG. 16 shows a state in which the chair 1 is placed in a seated position facing the desk 100. In order to establish the distance between the desk 100 and the person that the person feels is optimal and to determine the seating position, it is possible to move the chair position little by little and check the seating position each time. Alternatively, only for the first time, it is necessary to pull the entire chair 1 forward while sitting, or to move it delicately back and forth many times as the case may be. This movement can also be performed by a caregiver.

FIG. 17 is a plan view for explaining movement of the seat portion 20 from the seated position to the unseated position in FIG. 16. The seat plate 22 in the seated position is shown by a solid line, the rotary slide mechanism 40 in the seated position is shown by a broken line, and the seat plate 22 and the rotary slide mechanism 40 in the unseat position are shown by a chain double-dashed line. When a person sitting in a seated position wants to stand up away from the desk 100, he or she can move to the away position by fixing the soles of their feet on the floor and twisting their hips. FIG. 17 shows a case where the user performs a motion of twisting the waist in the counterclockwise rotation direction. Due to this twisting action, the seat 20 attempts to rotate to the left, but since the moving shaft 62 is pulled from the stationary shaft 61 via the link 63, the seat 20 moves a distance toward the center line P on the slide mechanism 30. Slide only S. This movement of the seat portion 20 is realized without the person being consciously aware of it, so the person does not feel any trouble at all. In this embodiment, it is possible to move the seat portion 20 backward by about 100 mm to the unseat position by a left rotation movement of about 60 degrees. When the slide distance S reaches 115 mm, the vehicle body 32 hits the stopper 47, and the bottom plate 46 and the seat plate 22 fixed thereto are prevented from sliding any further. While the seat 20 is rotating, the seat 20 gradually moves away from the table 100, so that the arms of the seated person do not interfere with the edge of the table 100 or objects placed on the table 100, as in conventional rotating chairs. There's nothing left to do.
At the unseat position, there is sufficient space between the seat 20 and the desk 100, so the seated person can easily stand up and leave the seat. The same applies when the seat portion 20 is rotated clockwise from the seated position and moved to the unseated position.

As shown in the plan view of FIG. 24, in the seated position, the link mechanism is arranged in a straight line in the front-back direction (on the center line 200 of the chair), so the seat 20 is moved in the front-back direction toward the desk 100. He is restrained so that he cannot move. Therefore, there is no fear that the seat portion 20 will inadvertently move back and forth while the user is seated.
As described above, even if the actions for leaving and sitting are repeated many times, the original seating position will not shift. That is, it is possible to reliably and easily reproduce the seating position once determined.
From the above, it is possible to realize the rotation of the seat and the movement of the seat back and forth only by the movement of the seated person who rotates the seat. It is possible to realize a chair that eliminates the inconvenience of the prior art of having to carry out the process in two stages. By simply rotating the seat 20 without moving the entire chair, the seated person can automatically approach the table safely when taking a seat, and automatically move safely away from the table when leaving the seat. You can leave.

Although the slide mechanism 30 of this embodiment uses a pair of rails that run on a vehicle body with wheels, the present invention is not limited to this. Any existing design of sliding mechanism consisting of A and a sliding portion can be used.
Although the rotating mechanism of this embodiment uses a commercially available rotating plate, the present invention is not limited to this, and any existing rotating mechanism including a stationary part B and a rotating part can be used.

(Third embodiment)
Next, a chair according to a third embodiment will be described with reference to FIGS. 18 to 20.
FIG. 18 is a longitudinal sectional view of a chair according to a third embodiment of the present invention. FIG. 19 is an exploded perspective view of a chair according to a third embodiment of the present invention. FIG. 20 is a combination layout diagram (plan view) of a chair and table according to the third embodiment of the present invention, and shows the movement of the seat board from the seated position to the unseated position when the seated person performs a counterclockwise rotation motion. It is a figure for explaining the movement of the rotation slide mechanism accompanying movement.
Similarly to the chair of the second embodiment, also in this embodiment, the rotating slide mechanism 40 has a configuration in which a rotating mechanism 52 and a sliding mechanism 30, which are independent from each other, are combined.

The leg portion 10 has a disk-shaped leg 11 fixed to its lower part, a support 14 having a through hole in the center, and a shaft that is fitted into the through hole of the support 14 and projects from the top of the support 14. 15, a pedestal 13 fixed to the upper part of the shaft, and a footrest 17 attached to the support column 14. The pedestal 13 is fixed to the lower surface of the bottom plate 46. On one side of the outer circumferential surface of the shaft 15, four notches arranged along the longitudinal direction of the shaft 15 are formed. A shaft fixing bolt 16 with a handle for turning by hand is passed through a screw hole formed on the outer peripheral surface of the column. The shaft 15 is fixed to the support column 14 by pressing the tip of the shaft fixing bolt 16 against the notch of the shaft 15. By selecting one of the four notches, the length by which the shaft 15 projects above the support column 14 can be adjusted, and as a result, the height of the seat surface 23 from the floor surface can be adjusted.

As shown in FIGS. 18 and 19, the chair 1 includes a leg section 10, a seat section 20, a slide mechanism 30 for horizontally moving the seat section 20 relative to the leg section 10, and a slide mechanism 30 for making the seat section 20 horizontally movable relative to the leg section 10. A rotation mechanism 52 is provided for making the seat portion 20 rotatable.
The slide mechanism 30 includes a pair of rails 35 and a vehicle body 32 provided with wheels 33 at both ends so as to run on the pair of rails 35. A pair of rails 35 on which the vehicle body 32 runs are fixed to the upper surface of the bottom plate 46, and a pair of rail side plates 36 are further attached to surround the rails. A slip-off prevention cover 44 is attached to each of the pair of rail side plates 36. The vehicle body 32 is a stationary part A of the slide mechanism 30, and the bottom plate 46, rail 35, rail side plate 36, and slip-off prevention cover 44 are sliding parts of the slide mechanism 30. The rotating mechanism 52 includes a rotating cylinder 55 fitted to the tip of the shaft 15 with a bearing member 56 interposed therebetween. In this embodiment, a solid sliding bearing member made of resin is used as the bearing member 56. Further, a slip-off preventing member (not shown) is attached to prevent the rotating cylinder 56 from slipping off from the shaft 15. The shaft 15 is a stationary part B of the rotating mechanism 52, and the rotating cylinder 55 is a rotating part of the rotating mechanism 52.

The slip-off prevention cover 44 has an L-shaped angle shape, and is fixed to the upper surface of the wheel 33 so as to face it with a gap of about 1 mm. Therefore, the fall-off prevention cover 44 can prevent the vehicle body 32 from shaking or coming off from the bottom plate 46 during use. The rotating cylinder 55 is attached to the lower surface of the bottom plate 46, and the upper surface of the vehicle body 32 is attached to the lower surface of the seat plate 22.
The chair 1 further includes a moving shaft 62 attached perpendicularly to the lower surface of the seat plate 22, a stationary shaft 61 attached to the tip of the stay 17 fixed to the shaft 15, and a stationary axis 61 and a moving axis 62. and a link 63 that connects. The moving shaft 62 is arranged on a circumference 300 having a radius L2 centered on the center line P of rotation of the seat portion 20. In this embodiment, the radius L2 is 230 mm. Further, the distance L1 between the stationary shaft 61 and the moving shaft 62 is 115 mm. Two through holes formed at both ends of the link 63 are fitted into a stationary shaft 61 and a moving shaft 62, respectively. The distance between the centers of the two through holes is 115 mm. Circumferential grooves are provided at the distal ends of the stationary shaft 61 and the moving shaft 62, and a retaining ring 64 is attached to prevent the link 63 from coming off.

As shown in the plan view of FIG. 20, in the seated position, from the front to the rear, the center line R of the moving shaft 62, the center line Q of the stationary shaft 61, and the center line P of rotation are on a straight line (the center of the chair (on line 200). The leg portion 10 and the seat portion 20 are connected in a horizontal plane via a link mechanism composed of a stationary shaft 61, a moving shaft 62, a link 63, and a retaining ring 64. The movement is linked to the forward and backward movement. A stopper 47 that prevents movement of the vehicle body 32 is fixed to a predetermined rear position on the upper surface of the bottom plate 46.
How the rotational movement of the seat part 20 and the movement of the back and forth movement of the seat part 20 are linked will be explained with reference to FIG. 20.
In order to establish the distance between the desk 100 and the person that the person feels is optimal and to determine the seating position, it is possible to move the chair position little by little and check the seating position each time. Alternatively, only for the first time, it is necessary to pull the entire chair 1 forward while sitting, or to move it delicately back and forth many times as the case may be. This movement can also be performed by a caregiver.

The seat plate 22 in the seated position is shown by a solid line, the rotary slide mechanism 40 in the seated position is shown by a broken line, and the seat plate 22 and the rotary slide mechanism 40 in the unseat position are shown by a chain double-dashed line. When a person sitting in a seated position wants to stand up away from the desk 100, he or she can move to the away position by fixing the soles of their feet on the floor and twisting their hips. FIG. 20 shows a case where the user performs a motion of twisting the waist in the counterclockwise rotation direction. Due to this twisting action, the seat 20 attempts to rotate to the left, but since the moving shaft 62 is pulled from the stationary shaft 61 via the link 63, the seat 20 moves a distance toward the center line P on the slide mechanism 30. Slide only S. This movement of the seat portion 20 is realized without the person being consciously aware of it, so the person does not feel any trouble at all. In this embodiment, it is possible to move the seat portion 20 backward by about 100 mm to the unseat position by a left rotation movement of about 60 degrees. When the slide distance S reaches 115 mm, the vehicle body 32 collides with the stopper 47, and the vehicle body 32 and the seat plate 22 fixed thereto are prevented from sliding any further. While the seat 20 is rotating, the seat 20 gradually moves away from the table 100, so that the arms of the seated person do not interfere with the edge of the table 100 or objects placed on the table 100, as in conventional rotating chairs. There's nothing left to do.
At the unseat position, there is sufficient space between the seat 20 and the desk 100, so the seated person can easily stand up and leave the seat. The same applies when the seat portion 20 is rotated clockwise from the seated position and moved to the unseated position.

As shown in the plan view of FIG. 20, in the seated position, the link mechanism is arranged in a straight line in the front-rear direction (on the center line 200 of the chair), so the seat 20 is moved in the front-rear direction toward the desk 100. He is restrained so that he cannot move. Therefore, there is no fear that the seat portion 20 will inadvertently move back and forth while the user is seated.
As described above, even if the actions for leaving and sitting are repeated many times, the original seating position will not shift. That is, it is possible to reliably and easily reproduce the seating position once determined.
From the above, it is possible to realize the rotation of the seat and the movement of the seat back and forth only by the movement of the seated person who rotates the seat. It is possible to realize a chair that eliminates the inconvenience of the prior art of having to carry out the process in two stages. By simply rotating the seat 20 without moving the entire chair, the seated person can automatically approach the table safely when taking a seat, and automatically move safely away from the table when leaving the seat. You can leave.

The slide mechanism 30 of the present embodiment uses a vehicle body with wheels running on a pair of rails, but is not limited to this, and may include a slide mechanism that combines a linear guide and a slide rail, etc. Any existing design of sliding mechanism consisting of A and a sliding portion can be used.
Although the rotation mechanism of this embodiment uses a solid sliding bearing member, it is not limited thereto, and any sliding bearing member or rolling bearing member can be employed. Also, other existing designs of rotation mechanisms may be utilized.
In this embodiment, the height of the seat surface 23 from the floor surface can be adjusted in four stages, but it may be changed to an adjustment mechanism that can change the height steplessly.
This concludes the description of the chair according to the third embodiment.

It should be noted that the embodiments of the invention are not limited to the above-described embodiments as they are, and may be embodied by omitting, replacing, or changing the constituent elements without departing from the gist of the invention at the implementation stage. It is possible. These embodiments and their modifications are included within the scope and gist of the invention, as well as within the scope of the invention described in the claims and its equivalents. If necessary, various inventions can be formed by appropriately combining the plurality of components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiments. Furthermore, components of different embodiments may be combined as appropriate.

In the embodiment of the present invention, the top or bottom surface of the bottom plate 46 is arranged horizontally, but the top or bottom surface of the bottom plate 46 does not necessarily have to be horizontal. It may be a plane that is inclined at an angle of less than 5 degrees from the horizontal, as long as it does not adversely affect the operation.
In the embodiment of the present invention, the slip-off prevention cover 44 is provided, but the slip-off prevention cover 44 can be eliminated by shaping the guide plate 45 and the rail side plate 36 to have a shape that also functions as the slip-off prevention cover 44. can.
In the embodiment of the present invention, the rotary slide mechanism 40 is provided with a stopper 47 that prevents the seat portion 20 from moving backward beyond the rear end position. The stopper 47 can be eliminated by making it also function as the stopper 47.

Although omitted in the embodiment of the present invention, the rotary slide mechanism 40 may be provided with another stopper that prevents the seat portion 20 from moving forward beyond the front end position. If there is a risk of the link 63 becoming disengaged from the stationary shaft 61 or the moving shaft 62, it is possible to prevent the seat 20 from falling beyond its front end position.
Although the seat portion 20 of the embodiment of the present invention does not include an armrest portion, it may include an armrest portion.
Although the seat portion 20 according to the embodiment of the present invention includes the back portion 24, the seat portion 20 may not include the back portion 24.
In the first embodiment of the present invention, the stationary shaft 61 of the link mechanism 60 is fixed to the support plate 41 and the moving shaft 62 is fixed to the bottom plate 46, but the stationary shaft 61 is fixed to the leg part 10. It is sufficient that the moving shaft 62 is fixed integrally with the seat portion 20. In the second embodiment of the present invention, the stationary shaft 61 of the link mechanism 60 is fixed to the leg support section 12, and the moving shaft 62 is fixed to the bottom plate 46, but the stationary shaft 61 is fixed to the leg support section 12. It is sufficient that the moving shaft 62 is fixed integrally with the seat portion 20 . In the third embodiment of the present invention, the stationary shaft 61 of the link mechanism 60 is fixed to the shaft 15, and the moving shaft 62 is fixed to the seat plate 22, but the stationary shaft 61 is fixed to the leg 10. It is sufficient that the moving shaft 62 is fixed integrally with the seat portion 20.
Although the link 63 in the embodiment of the present invention uses an elongated flat plate, it is not limited to a flat plate, but any shaped member can be used. For example, by forming the link 63 into a stepped shape in the longitudinal direction, it is possible to cope with a case where the vertical position of the stationary shaft 61 and the vertical position of the moving shaft 62 are different.
Although the joint between the link 63 and the stationary shaft 61 and the joint between the link 63 and the moving shaft 62 in the embodiment of the present invention are simply loose fittings, a sliding bearing mechanism or a rolling bearing mechanism may also be adopted. .

1 Chair 10 Leg 11 Leg 12 Leg support 14 Support 15 Shaft 16 Shaft fixing bolt 17 Stay 20 Seat 21 Seat cushion 22 Seat plate 23 Seat 24 Back 30 Slide mechanism 32 Car body 33 Wheel 35 Rail 36 Rail side plate 40 Rotating slide Mechanism 41 Support plate 42 Cylindrical part P Center of rotation (center line)
43 Sliding friction reducing member (A)
44 Fallout prevention cover 45 Guide component 46 Bottom plate 47 Stopper 48 Sliding friction reducing member (B)
51 Friction reducing element 52 Rotating mechanism 53 Top plate 54 Base plate 55 Rotating cylinder 56 Bearing member 60 Link mechanism 61 Stationary shaft Q Center of stationary shaft (center line)
62 Movement axis R, R' Center of movement axis (center line)
63 Link 64 Retaining ring L1 Distance between QRs L2 Distance between PRs θ Rotation angle S Slide distance 100 Table 200 Center line of chair
300 Circumference of radius L2 centered at P

Claims (3)

A chair used in combination with a table,
a leg having at least a leg;
a seat provided above the leg;
The seat part is aligned with the center line P within one plane clockwise and counterclockwise to a predetermined angle from the seating position where the seated person sitting on the seat faces the table with respect to the leg part . a rotary slide mechanism that is rotatable around the seat and is provided so that the seat can slide within the plane from the seating position to a predetermined distance in a direction approaching the center line P with respect to the leg;
a stationary axis provided perpendicular to the plane so as to be integrated with the leg; a moving axis provided perpendicular to the plane so as to be integrated with the seat; and the stationary axis and the moving axis. A link that connects the , a link mechanism whose main components are,
Equipped with
The link mechanism causes the seat to slide and rotate so that the seat rotates from the seating position to the predetermined angle and slides from the seating position to the predetermined distance. In conjunction with
In the seating position, the center line R of the moving axis , the center line Q of the stationary axis, and the center line P are arranged in order on a straight line in the direction from the table to the seat ,
the relative position of the center line P and the leg remains unchanged;
A chair characterized by:
The rotary slide mechanism is
a bottom plate having a lower surface along the plane;
a support plate having an upper surface disposed opposite to the lower surface and a cylindrical portion formed with a center line perpendicular to the lower surface;
a friction reducing element that is provided on the lower surface and/or the upper surface and reduces frictional resistance between the bottom plate and the support plate;
The main component is two elongated guide parts attached in parallel in a direction from the table to the seat at the seating position so as to sandwich the cylindrical part between the bottom plate ,
The chair according to claim 1, wherein a lower surface of the support plate is fixed to the leg portion, and an upper surface of the bottom plate is fixed to the seat portion.
The rotary slide mechanism is
The main components are a sliding mechanism having a stationary part A and a sliding part, and a rotating mechanism having a stationary part B and a rotating part,
The chair according to claim 1, wherein the stationary part B is fixed to the leg part, the rotating part is fixed to the stationary part A , and the sliding part is fixed to the seat part.

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