Linking chairs

Abstract

To provide a connection chair for facilitating a change into a front position / rotation position.SOLUTION: A connection chair includes: a plurality of chairs supported by a base so as to be rotatable in a horizontal direction; a link body to which the rotation shafts of the chairs are connected; and an angle change device arranged in at least one of the chairs. The angle change device includes: a stopper pin receiver where positioning holes to regulate a front position and an inclination position of the chairs are formed; and a rotation position restriction unit arranged under the stopper pin receiver and arranged in the base. The rotation position restriction unit includes a stopper pin arranged so as to be retractable with respect to the positioning holes and energized upward.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a linkable chair in which multiple chairs can rotate in unison. [Background technology]

[0002] In order to utilize a hall for multiple purposes, a viewing device with multiple chairs is sometimes installed. The chairs are supported so that they can rotate horizontally, and the mounting angle can be changed, with rotation restricted when they are in a front position or an inclined position rotated by a predetermined angle (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Actual opening H4-86445 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the chair of Patent Document 1, in order to rotate the chair, it is necessary to remove the stopper pin, rotate the chair, and then reattach the stopper pin, which is a time-consuming process.

[0005] The present invention has been made in view of this, and provides a connecting chair that can be easily changed between a forward position and a tilted position. [Means for solving the problem]

[0006] In order to solve the above problems, in one aspect of the present disclosure, a linked chair is configured to include a plurality of chairs rotatably supported on a base, a link body to which the rotation axes of the plurality of chairs are connected, and an angle change device provided on at least one of the plurality of chairs, wherein the angle change device has a stopper pin receiver with a positioning hole formed therein that determines the front position and inclined position of the chair, and a rotation position restraint unit disposed below the stopper pin receiver and provided on the base, and the rotation position restraint unit is configured to have a stopper pin that is capable of appearing and disappearing in the positioning hole and is biased upward.

[0007] According to this aspect, the stopper pin is biased upward, so that it is normally positioned in an upper position and engaged with the positioning hole to restrict the rotation of the chair. The stopper pin is held by a rotation position restriction unit, and after moving the stopper pin downward to retract from the positioning hole and releasing the engagement to rotate the chairs together, simply by removing the load on the stopper pin preventing downward movement, the stopper pin will naturally protrude upward due to the upward bias and engage with the positioning hole. This configuration allows one person to rotate the chair and easily change it to the forward position or tilted position.

[0008] In one embodiment, a plurality of the positioning holes are provided on a circumference of a circle centered on the rotation axis of the chair provided with the stopper pin receiver, so that the fixed position can be selected from a plurality of tilt positions.

[0009] In one embodiment, the stopper pin receiver is configured to be detachably attached to the chair. According to this embodiment, since it is detachable, it can be replaced with another stopper pin receiver having a positioning hole with a different fixing angle, thereby changing the tilt angle of the chair.

[0010] In one embodiment, the rotation position restriction unit is configured to be detachably mounted on the base. According to this embodiment, the rotation position restriction unit can also be attached to a different position in accordance with the stopper pin receiver. This allows the chair tilt angle to be changed more freely, for example, by tilting the chair in the opposite direction.

[0011] In one embodiment, the link body is arranged so as to be within the range of the chair in the front-to-rear direction when the seat of the chair is raised. According to this embodiment, the link body can also be attached to a movable seating system that tilts and stores the chairs.

[0012] In one aspect, a chair other than the chair provided with the stopper pin receiver and rotation position restraint unit is provided with another stopper pin receiver and rotation position restraint unit, the other stopper pin receiver having a positioning hole that defines a different chair position from the positioning hole of the stopper pin receiver. According to this aspect, the degree of freedom in the angle of the fixed chair is increased, and the chair can be rotated and fixed over a wider range. [Effects of the Invention]

[0013] As is clear from the above description, it is possible to provide a connecting chair that can be easily changed between a forward position and a tilted position. [Brief explanation of the drawings]

[0014] [Figure 1] This is a floor plan showing the arrangement of spectator seats A equipped with connecting chairs U. [Figure 2] FIG. 2 is a front view of the connecting chair U. [Figure 3] FIG. 2 is a side view of the connecting chair U. [Figure 4] 1 is a plan view of a linked chair U, and is an explanatory diagram of the rotation of multiple linked chairs S. FIG. [Figure 5] 1 is a front view of an angle-changing device provided on one of the connecting chairs, showing the movable-side mechanism and the fixed-side mechanism separated from each other. [Figure 6]1 is a rear view of the angle changing device, showing the movable mechanism and the fixed mechanism separately. [Figure 7] 1 is a rear perspective view of the angle changing device, showing the movable mechanism and the fixed mechanism separated from each other. [Figure 8] 10A and 10B are explanatory diagrams illustrating the movement of the rotation position restraining unit. [Figure 9] 10A and 10B are explanatory diagrams illustrating the movement of the angle changing device. [Figure 10] This is a modified example. [Figure 11] FIG. 11 is a modified example and is an enlarged view of FIG. [Figure 12] Another variation is shown. [Figure 13] Yet another variation. [Figure 14] FIG. 14 is a perspective view of FIG. [Figure 15] FIG. 14 is an exploded side view of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Specific embodiments of the present invention will be described below with reference to the drawings. The embodiments are illustrative and do not limit the invention, and all features and combinations described in the embodiments are not necessarily essential to the invention. In addition, in the following description of the examples and modifications, the same components are designated by the same reference numerals, and redundant description will be omitted as appropriate.

[0016] (spectator seats) First, as an example, we will explain a spectator seat A equipped with linkable chairs U, which is a preferred embodiment of the present disclosure. Fig. 1 is a floor plan of a building in which the spectator seat A is used. The spectator seat A is used in buildings with a wide floor area that are used for multiple purposes, such as large gymnasiums or event buildings.

[0017] As shown in Figure 1, the building floors are equipped with a sports arena D and a stage E. Sports arena D is, for example, a volleyball or basketball court. Stage E is installed adjacent to sports arena D at right angles. Sports arena D and stage E can be used alternately, allowing the building to be used for multiple purposes.

[0018] The seating area A is a tiered seating area, with many chairs S arranged in rows on a stepped floor that is the lowest at the front and increases in height towards the back. The seating area A has multiple rows of stairs that serve as aisles in the front and back directions, and the chairs S arranged side by side on the same level are divided by the stairs, with multiple chairs in each row forming linked chairs U that form a single unit.

[0019] The chairs S in the spectator seats A are supported so as to be rotatable in the horizontal direction, and when the chairs S rotate from a front position to an inclined position, the visual direction is changed from normal visual F to angle-changed visual G.

[0020] Spectators in seats A can easily view the events taking place in stadium D directly in front of them with normal vision F, and when there is an event on stage E, even if the stage E side is at a different angle vision G from seats A, they can still view the event from a visual arrangement that is almost the same as the vision from stadium D side.

[0021] (Connectable Chair U) Each linked chair U is provided with a link body 8. The link body 8 allows the multiple chairs S to move in unison, and simply by rotating one chair S, all of the chairs S of the linked chair U are rotated by the same angle around their respective rotation axes. In addition, at least one chair S is provided with an angle changing device 1. The angle changing device 1 makes it easy to change the rotation angle of the chair S. This will be explained using Figures 2 to 4.

[0022] FIG. 2 is a front view of the linked chair U. As an example, the linked chair U includes four chairs S. FIG. 3 is a side view of the linked chair U. FIG. 4 is a plan view of the linked chair U, and is an explanatory diagram for explaining the rotation of the chairs S. In order to show the rotation state, only the main parts are shown. FIG. 4(A) shows the front position, and FIG. 4(B) shows the tilted position rotated 30 degrees.

[0023] As shown in Figure 2, the linked chair U is made up of four chairs S connected side by side. Each chair S is supported so that it can rotate horizontally around a rotation axis Ax1, and all four chairs S move in unison. In the following explanation, the moving mechanism that rotates in unison will be referred to as the moving mechanism MOVE, and the fixed mechanism that is fixed to the floor and does not move will be referred to as the fixed mechanism FIX.

[0024] A pillar 3 stands up from a base 2 fixed to the floor FL, which is one of the horizontal rows of spectator seats A, and a base pipe BASE, which has the width of the linked chairs U in the left-right direction, is erected on top of the pillar 3.

[0025] The base pipe BASE is a metal pipe with a rectangular cross section, and is fixed parallel to the floor surface FL with its longitudinal direction aligned with the extension direction of the floor surface FL. Support shafts 5 are erected on the top surface of the base pipe BASE at intervals of one seat. Chair bases 10 are rotatably held on the support shafts 5.

[0026] The chair base 10 is a metal pipe with a rectangular cross section cut to the width of one chair, and a base plate on which the chair seat rests and arm supports are attached to this chair base 10. A through-hole (not shown) is provided in the center of the chair base 10 in the vertical direction, and the chair base 10 is passed through this through-hole and loosely fitted onto the support shaft 5, thereby holding the chair S rotatably around the support shaft 5. The central axis of the support shaft 5 becomes the rotation axis Ax1 of the chair S.

[0027] The connecting chair U is provided with a link body 8 that is connected to the rotation axis Ax1 of multiple chairs S (see FIG. 4). The link body 8 is connected to a protrusion 30 that protrudes from the back side of each chair base 10 so as to be rotatable horizontally around a vertical axis Ax2.

[0028] An angle changing device 1 is provided on one of the chairs S of the connecting chairs U (see FIG. 2). In this embodiment, the angle changing device 1 is provided on the rightmost chair, but this is not a limitation and it can be provided on any chair S. Furthermore, as will be described in detail later, the angle changing device 1 is provided detachably, so that after the angle changing device 1 is once attached to a chair S, it can be attached to another chair S.

[0029] The angle changing device 1 includes a stopper pin receiver 20 fixed to the chair base 10, and a rotation position restraint unit 50 fixed to the base pipe BASE.

[0030] The stopper pin receiver 20 is provided with a plurality of positioning holes H1, H2, and H3. The positioning holes H1 to H3 are formed on a circumference centered on the rotation axis Ax1 of the chair S to be provided, penetrating in the vertical direction. Hereinafter, when referring to any one of the positioning holes H1 to H3 without specifying which one is to be referred to, it will be simply referred to as a positioning hole H.

[0031] The rotation position restraint unit 50 is provided with a stopper pin 52 that is biased upward and can be projected and retracted. The stopper pin 52 projects upward and engages with the positioning hole H, thereby restraining the rotation of the chair base 10.

[0032] As shown in FIG. 4(A), when the chair S is in the normal front position, the stopper pin 52 protrudes upward and engages with the positioning hole H3, restricting the chair S from rotating.

[0033] As shown in FIG. 4(B), to place the chair S in the tilted position, the stopper pin 52 is moved downward and retracted from the positioning hole H3, thereby releasing the engagement. This releases the restriction on the rotation of the chair S, allowing the chair S to rotate about the rotation axis Ax1 toward the tilted position. At this time, because all four chairs S are connected by the link body 8, simply rotating any one chair S causes all chairs S to rotate by the same angle around their respective rotation axes Ax1. After the chair S has been rotated by a predetermined angle, the retraction of the stopper pin 52 is released. Because the stopper pin 52 is biased upward, it now protrudes into the positioning hole H1 and engages with it. The chair S is restricted from rotating while remaining in the rotated state by the predetermined angle. In this way, the chair S can be selectively placed in the forward position or the tilted position.

[0034] (Angle change device 1) The angle change device 1 will be described in detail using Figs. 5 to 7. The angle change device 1 is configured to be able to restrict the rotation of the connecting chair U at a predetermined angle. Fig. 5 is a front view of the angle change device 1, Fig. 6 is a rear view of the angle change device 1, and Fig. 7 is a rear perspective view of the angle change device 1. For the sake of explanation, in Figs. 5 to 7, the moving mechanism MOVE and the fixed mechanism FIX are shown spaced apart vertically with respect to the support shaft 5.

[0035] First, the moving mechanism MOVE will be explained.

[0036] As described above, the chair base 10 of the moving mechanism MOVE is the base of the chair S to which the mechanism of the chair S is attached, and the viewing direction of the chair S is determined by the rotation position (rotation angle) of the chair base 10.

[0037] A stopper pin receiver 20 and a protrusion 30 are fixed to the chair base 10.

[0038] The protrusion 30 is mainly composed of a base material 31. The base material 31 is made of a single flat metal plate, with the left and right portions bent up at 90 degrees and side surfaces 31b standing upright from the left and right edges of the bottom surface 31a.

[0039] The side surface 31b has a rectangular cutout 31c formed in accordance with the shape of the chair base 10. The bottom surface 31a has an insertion hole 31d. The support shaft 5 is inserted through the insertion hole 31d and then through a through-hole (not shown) formed in the chair base 10, and a nut 9 is fastened, whereby the chair base 10 is rotatably assembled to the support shaft 5 in a loosely fitted state. The base material 31 is engaged with the chair base 10 at the cutout 31c and fixed thereto to form an integrated unit, and when the chair base 10 rotates, it rotates together with the chair base 10 as a protrusion 30.

[0040] A through-hole 31e is provided near the rear of the bottom surface 31a of the base material 31, and a link body 8 is connected to the through-hole 31e by a bolt 35 and a nut 36 so as to be rotatable in the horizontal direction around a vertical axis Ax2 at the center of the through-hole 31e as the rotation axis. The other chairs S are similarly rotatably connected to the link body 8, and all of the chairs S of the linked chairs U rotate in unison via the link body 8.

[0041] The stopper pin receiver 20 has a base body 21. The base body 21 is formed by cutting and bending a flat metal plate, so that a side surface 21b extends from a bottom surface 21a, and a cutout portion 21c is provided in the side surface 21b to match the shape of the chair base 10. Furthermore, a contact portion 22 made of a flat metal plate is welded to the front surface of the base body 21, with its lower portion protruding downward from the bottom surface 21a. The chair base 10 engages with the cutout portion 21c, and the contact portion 22 is fastened to the chair base 10 with a bolt 23 and a nut 24. As a result, the base body 21 is fixed to and integrated with the chair base 10, and when the chair base 10 rotates, the base body 21 rotates together with the chair base 10 as the stopper pin receiver 20.

[0042] The bottom surface 21a of the base body 21 is provided with the above-mentioned positioning holes H1, H2, and H3. The positioning hole H3 determines the front position of the chair S. The positioning holes H2 and H1 are provided at 15-degree intervals from H3 on a circle that passes through the positioning hole H3 and is centered on the rotation axis Ax1. The positioning holes H2 and H1 determine inclined positions rotated 15 degrees and 30 degrees, respectively, from the front position of the chair S. The number of positioning holes is not limited to this, and any desired number of positioning holes that define inclined positions rotated by a predetermined angle from the front position can be provided.

[0043] The aforementioned link body 8 is held at a distance in the vertical direction from the protrusion 30 and the stopper pin receiver 20 (see Figure 6; there is a space between the upper surface of the link body 8 and the lower surface of the bottom surfaces 31a, 21a to provide play), so it rotates smoothly without coming into contact with the protrusion 30 and the stopper pin receiver 20.

[0044] Next, the fixed mechanism FIX will be described.

[0045] A support shaft 5 is erected on the base pipe BASE of the fixed mechanism FIX. An oil-free washer 6 is fitted into the support shaft 5. The oil-free washer 6 is interposed between the movable mechanism MOVE and the fixed mechanism FIX, specifically between the lower surface of the bottom surface 31a of the protrusion 30 and the upper surface of the base pipe BASE, allowing the movable mechanism MOVE to rotate smoothly.

[0046] A rotation position restraint unit 50 is fixed to the base pipe BASE. The rotation position restraint unit 50 is disposed below the stopper pin receiver 20.

[0047] The rotation position restraint unit 50 has a housing 51 made of a flat metal plate. A portion of a side surface 51f of the housing 51 is cut out and raised to form an abutment surface 51a, which, together with a backing plate 59, holds the base pipe BASE from the front and rear directions and is fastened with bolts 57 and nuts 58, thereby fixing the housing 51 to the base pipe BASE.

[0048] A stopper pin 52 is disposed vertically in the housing 51, passing through a hole 51c in the top surface 51b and a hole 51e in the bottom surface 51d. The stopper pin 52 is biased upward by an elastic member 55.

[0049] The stopper pin 52 is provided with an engagement hole 52a that penetrates in the left-right direction. An engagement pin 54 is inserted into the engagement hole 52a and protrudes in the left-right direction. This engages movably with vertically elongated holes 51g formed in the left and right side surfaces 51f of the housing 51.

[0050] An auxiliary member 56 is disposed inside the housing 51. The auxiliary member 56 has a U-shape with two opposing side surfaces 56a connected together. A hexagonal bolt is welded to the two opposing side surfaces 56a as a horizontal shaft 53, and the horizontal shaft 53 penetrates a side surface 51f of the housing 51 and is rotatably supported. This allows the auxiliary member 56 to be rotatably supported in the vertical direction within the housing 51. One end of the horizontal shaft 53 is a hexagonal columnar head 53a that is the bolt head, and the auxiliary member 56 is held in a state where the head 53a protrudes from the side surface 51f. Therefore, by rotating the head 53a from outside the housing 51, the auxiliary member 56 disposed inside the housing 51 can be rotated.

[0051] A horizontally elongated hole 56b is formed in a side surface 56a of the auxiliary member 56, and the aforementioned engagement pin 54 is inserted into and engaged with this horizontally elongated hole 56b. The rotation of the auxiliary member 56 is converted into vertical movement of the stopper pin 52 via the engagement pin 54 by the two vertically elongated holes 51g and the horizontally elongated hole 56b.

[0052] (Movement of stopper pin 52) The movement of the stopper pin 52 will be described in detail with reference to Figure 8. Figure 8(A) shows the stopper pin 52 in its upper state, and Figure 8(B) shows the stopper pin 52 in its lower state.

[0053] As shown in Figure 8(A), stopper pin 52 is biased upward by a spring, which is an elastic member 55. The movement range of stopper pin 52 is within the range of vertically elongated hole 51g, and in the normal state where nothing is done, it is held at the upper position of vertically elongated hole 51g by engagement pin 54. At this time, the tip of stopper pin 52 protrudes from upper surface 51b of housing 51 and is inserted into and engaged with positioning hole H of stopper pin receiver 20. The engagement of stopper pin 52 restricts the rotation of moving mechanism MOVE.

[0054] When the head 53a of the hexagonal column protruding from the side surface 51f is rotated counterclockwise using a rotating tool SL (shown by double-chain lines), such as a socket wrench, the auxiliary member 56 rotates downward. Since the worker is working while standing in front of the connecting chair U, this action results in the bar of the rotating tool SL being pulled upward. This is not synchronized with the movement direction of the stopper pin 52, making it difficult to rotate and resistant to tampering.

[0055] The rotation of the auxiliary member 56 is converted into a downward movement of the engagement pin 54, and the downward movement of the engagement pin 54 causes the stopper pin 52 to move downward and sink into the housing 51. The stopper pin 52 disengages from the positioning hole H, and the engagement with the stopper pin receiver 20 is released, allowing the chair S to rotate (see FIG. 8(B)). After the chair S has been rotated by a predetermined angle, when the load on the bar of the rotating device SL is released, the upward bias of the elastic member 55 moves the engagement pin 54 upward, and the stopper pin 52 moves upward and is inserted into the positioning hole H again.

[0056] Figure 9 shows the moving mechanism MOVE and fixed mechanism FIX in their actual arrangement. Figure 9(A) shows the front position of chair S (rotated 0 degrees), and Figure 9(B) shows the tilted position of chair S (rotated 30 degrees).

[0057] When moving from the front position in Figure 9(A) to the rotated position in Figure 9(B), the stopper pin 52 is retracted using the procedure described above to release it from the stopper pin receiver 20 (positioning hole H). Because the stopper pin 52 is biased upward, the worker holds up the bar of the rotating tool SL, such as a socket wrench, with one hand while rotating one chair S by a predetermined angle with the other hand. All of the chairs S are rotated by the predetermined angle by the link body 8.

[0058] The upward biasing force of the elastic member 55 is also transmitted to the turning device SL via the engagement pin 54, so when the load on the bar of the turning device SL is stopped, the bar of the turning device SL is naturally pushed down, and the stopper pin 52 protrudes upward and is inserted into the positioning hole H1. The upper surface of the stopper pin 52 is shaped like a tapered trapezoidal cylinder, so that the stopper pin 52 naturally fits into the positioning hole H not only at the exact position of the positioning hole H but also when it protrudes into a position nearby. The tip of the stopper pin 52 may be hemispherical. The shape of the stopper pin 52 naturally fitting into a nearby positioning hole H prevents engagement failure.

[0059] 9(B) to return to the front position, the stopper pin 52 is retracted to release the rotation restriction in the same manner as above, and one chair S is rotated in the opposite direction. All the chairs S rotate in unison due to the link body 8.

[0060] At this time, since the abutment portion 22 of the stopper pin receiver 20 is provided on the front surface of the stopper pin receiver 20 and protrudes downward from the bottom surface 21a thereof, the lower protruding portion abuts against the base pipe BASE at the front position (0-degree rotation) (see FIG. 9(A)). The abutment portion 22 is a stopper that prevents over-rotation to the opposite side, and due to the cutout portion 59a provided in the backing plate 59, it comes into direct surface contact with the base pipe BASE without abutting against the backing plate 59. Because the abutment portion 22 stops the moving mechanism MOVE at the correct front position, when the load on the bar of the rotating device SL is stopped, the bias of the elastic member 55 naturally causes the stopper pin 52 to protrude upward and be inserted into and engaged with the positioning hole H3 that determines the front position.

[0061] The upward bias of the elastic member 55 makes the series of operations easy, and the angle change operation of the connecting chairs U can be performed by a single worker.

[0062] The stopper pin receiver 20 is not provided on the support shaft 5, but is provided as a separate body from the chair base 10, and is fixed to the chair base 10 at a position offset in the left-right direction from the support shaft 5. The stopper pin receiver 20 is fixed to the chair base 10 by bolting, and is configured to be detachable. For this reason, it is possible to replace it with another stopper pin receiver that has a different fixing angle, i.e., a different arrangement of positioning holes.

[0063] Because the horizontal shaft 53 is a hexagonal bolt, no dedicated tool is required to rotate it; commercially available tools such as socket wrenches, adjustable wrenches, and spanners can be used as the rotation tool SL. The rotation lever for rotating the horizontal shaft 53 is not directly mounted on the housing but is configured as a separate unit, thereby enabling the overall size, particularly the front-to-back width, to be made more compact. The longer the handle of the bar connected to the horizontal shaft 53, the farther the point of application and the less force required to rotate it. However, adding a rotation lever would increase the width of the device in the front-to-back direction, creating a risk of visitors hitting and tripping over it. This can be reduced. Additionally, by not mounting the rotation lever on the chair S, it is possible to prevent visitors from accidentally operating the lever.

[0064] (Variation) Although the preferred embodiment of the present invention has been described, the present invention is not limited to the above configuration. The configuration of the present disclosure can be applied not only to permanently installed spectator seats but also to movable spectator seats.

[0065] Fig. 10 is an explanatory diagram of movable spectator seats B using connecting chairs U. The movable spectator seats B are configured to be storable, with Fig. 10(A) being a side view in the storable state and Fig. 10(B) being a side view in the used state. Fig. 11 is an enlarged view of Fig. 10.

[0066] The movable spectator seating B is equipped with a plurality of platforms FU, and a connecting chair U1 is placed on each platform FU. The connecting chair U1 has the same configuration as the connecting chair U, except that a base 2 is fixed to the platform FU, and a pillar 3 is supported by the base 2 so that it can be raised and lowered forward.

[0067] In the stored state shown in Fig. 10(A), the plurality of platform FU constituting the movable spectator seats B are generally aligned vertically. Fig. 11 shows the connecting chair U1 in an upright state and a reclined state.

[0068] Each tier of the tiered movable spectator seating B is composed of a fixed member K extending along the floor surface FL, a fixed support J attached to the fixed member K, and a floor base FU extending from the fixed support. The tiered movable spectator seating B is configured such that the fixed support J becomes shorter the further forward the tier.

[0069] In the stored state, the connecting chair U1 fixed to each platform FU tilts forward. In the tilted state, the connecting chair U1 fits within the installed platform FU in the front-to-back direction, and is lower than the bottom surface of the rear platform FU in the vertical direction. Each step can be moved forward, and by storing each step in turn in the space SP below the rear platform FU, all steps are finally aligned vertically.

[0070] As shown in Fig. 11, the angle changing device 1 of this embodiment has a compact configuration, and the link body 8 is also arranged so that it fits within the range of the front-to-back width of the chair S when the seat of the chair S is upright (the two-dot chain line in Fig. 11 indicates the rearmost part of the chair S, and the link body 8 is arranged in front of this line). Therefore, even when the connectable chair U1 is tilted forward by the pillar 3 to put it into the stored state, the link body 8 is arranged below the top surface of the chair S in the tilted state, and does not interfere with the storage of the chair S.

[0071] The movable seats B are configured to be freely movable, allowing the floor to be used in a variety of configurations. In this way, the configuration of the present disclosure can be applied not only to permanently installed seats, but also to movable seats.

[0072] FIG. 12 shows a plan view of the schematic configuration of a connecting chair U2, which is another modified example.

[0073] 12, the rightmost chair S is equipped with an angle change device 1, and the leftmost chair S is equipped with an angle change device 101 configured symmetrically to the angle change device 1. The linkable chair U2 is not provided with a contact portion 22, and the horizontal rotation of the chair S is not restricted to either the left or right direction.

[0074] Positioning holes H4 to H6 symmetrical to the positioning holes H1 to H3 are formed in the stopper pin receiver 120 of the angle changing device 101. When the chair S rotates to the right, the stopper pin 52 engages with one of the positioning holes H1 to H3. When the chair S rotates to the left, the stopper pin 152 engages with the positioning holes H4 to H6. This allows the connecting chair U2 to change the viewing direction not only to the right but also to the left. In the connecting chair U2, the angle changing device 101 is attached to a chair S different from the chair S to which the angle changing device 1 is attached, but the angle changing device 101 may also be attached to the same chair S as the angle changing device 1.

[0075] 13 and 14 show a linkable chair U3 equipped with an angle changing device 201 that is configured to be easily attached and detached as another modified example. Fig. 13 is a side view of the linkable chair U3. Fig. 14 is a rear perspective view of the angle changing device 201. Only the main parts are shown, appropriately spaced apart.

[0076] The angle changing device 201 has a stopper pin receiver 220 and a rotation position restraint unit 250. The stopper pin receiver 220 is configured to be able to be fixed at a desired position in the longitudinal direction of the chair base 10. The rotation position restraint unit 250 is configured to be able to be fixed at a desired position in the longitudinal direction of the base pipe BASE. Therefore, the angle changing device 201 can be attached and detached at a desired position.

[0077] The stopper pin receiver 220 and the rotation position restraint unit 250 are configured substantially identically to the stopper pin receiver 20 and the rotation position restraint unit 50, and differ only in the manner in which they are fixed. The fixed configurations of the stopper pin receiver 220 and the rotation position restraint unit 250 are the same. As a representative example, an exploded perspective view of the stopper pin receiver 220 is shown in Figure 15.

[0078] 14 and 15, stopper pin receiver 220 includes base material 221, cover material 225, low-head bolt 226, and nut 228. Base material 221 has rectangular notches 221c formed in side surfaces 221b extending from the left and right edges of bottom surface 221a, to which rectangular pipe 227 having a U-shaped cross section and an open front is welded.

[0079] The lid member 225 has a U-shaped cross section, and fits into the opening of the rectangular pipe 227 with the recessed portion facing inward, engaging with the opening of the rectangular pipe 227 like an inner lid.

[0080] The inner shape of the rectangular pipe 227 is formed to match the outer shape of the chair base 10. Two vertical through holes 227a, 225a that communicate when engaged are provided on the left and right sides of the front edges of the rectangular pipe 227 and the lid member 225. The low head bolt 226 is a hexagon socket low head bolt.

[0081] 15, when attaching the stopper pin receiver 220 to the chair base 10, the stopper pin receiver 220 is inserted from the rear into a desired position in the longitudinal direction of the chair base 10, the chair base 10 is stored inside the rectangular tube 227, and the cover member 225 is engaged from the front to sandwich the chair base 10 from the front to back. In this state, the low-head bolt 226 is inserted into the vertical through-holes 227a and 225a and the nut 228 is tightened, whereby the stopper pin receiver 220 is fixed to the chair base 10.

[0082] The upper vertical through-hole 227a is shaped to fit the shape of the head of the low-head bolt 226 so that the low-head bolt 226 can be stored inside the rectangular pipe 227. Therefore, when fastened, the low-head bolt 226, including its head, does not protrude from the rectangular pipe 227, and does not interfere with the rotation of the chair base 10.

[0083] As a result, the stopper pin receiver 220 is configured to be detachable from the chair base 10. Because it is detachable, it can be easily replaced with another stopper pin receiver having a different positioning hole. In addition, there is no need to provide holes for fixing in the chair base 10, and the clamp fixing method by clamping allows for easy change of positioning.

[0084] Similarly, the rotation position restraint unit 250 includes a housing 251, a cover member 260, a low-head bolt 261, and a nut 263. A rectangular notch 251h is formed in a side surface 251f of the housing 251, and a rectangular pipe 262 with a U-shaped cross section is welded to this notch with its front open. The inner shape of the rectangular pipe 262 is formed to match the outer shape of the base pipe BASE.

[0085] The housing 251 is inserted from the rear into a predetermined position in the longitudinal direction of the base pipe BASE below the stopper pin receiver 220, the base pipe BASE is stored inside the rectangular pipe 262, and the cover member 260 is engaged from the front to clamp the base pipe BASE from the front and rear. In this state, the rotation position constraint unit 250 is fixed to the base pipe BASE by inserting a low-head bolt 261 into a vertical through-hole (not shown) and tightening a nut 263. The head of the low-head bolt 261 does not protrude from the top surface of the rectangular pipe 262, so it does not interfere with the rotation of the moving mechanism MOVE, including the stopper pin receiver 220. This allows the rotation position constraint unit 250 to be fixed in accordance with the stopper pin receiver 220 fixed in the desired position.

[0086] According to the above configuration, the angle change device 201 can be attached at any position in the longitudinal direction without providing any holes for fixing it, and it can also be easily removed and reattached to a different location. For example, the angle change device 201 is attached to the rightmost chair S of the connecting chairs U2, but because there is not enough working space, it can be easily reattached to the leftmost chair S, or it can be easily replaced with an angle change device 201 with a different rotation angle to be used on a different stage. This allows for flexible adaptation to suit the arrangement and usage conditions.

[0087] The above describes preferred embodiments and modifications of the present invention, but the above embodiments are merely examples of the present invention, and these can be combined based on the knowledge of those skilled in the art, and such forms are also included in the scope of the present invention. [Explanation of symbols]

[0088] 1: Angle change device 8: Link body 10: Chair base 20: Stopper pin holder 50: Rotation position restraint unit 52: Stopper pin BASE: Base pipe H: Positioning hole S: Chair U: Connecting chair

Claims

1. a plurality of chairs supported on a base so as to be rotatable in a horizontal direction; a link body to which the rotation axes of the plurality of chairs are connected; and an angle changing device provided on at least one of the plurality of chairs; Equipped with the angle change device has a stopper pin receiver in which a positioning hole is formed to define a front position and an inclined position of the chair, and a rotation position restraint unit disposed below the stopper pin receiver and provided on the base, the rotation position restraint unit includes a stopper pin that is provided so as to be able to appear and disappear in the positioning hole and is biased upward; At least one of the stopper pin receiver and the rotation position restraint unit is detachably attached to the chair or the base by a fixing member, the stopper pin receiver and the rotation position restraint unit are configured as separate entities from the chair and the base; A linkable chair characterized by:

2. The positioning holes are provided in a plurality on a circumference centered on the rotation axis of the chair provided with the stopper pin receiver. The linkable chair according to claim 1 .

3. The stopper pin receiver is detachably provided on the chair.

3. The linkable chair according to claim 1 or 2.

4. The rotation position restraint unit is detachably provided on the base. The linkable chair according to any one of claims 1 to 3.

5. The link body is arranged so as to be within a range in the front-rear direction of the chair when the seat of the chair is raised. The linkable chair according to any one of claims 1 to 4.

6. Among the plurality of chairs, a chair other than the chair provided with the stopper pin receiver and the rotation position restraint unit is provided with another stopper pin receiver and a rotation position restraint unit, the another stopper pin receiver having a positioning hole formed therein that defines a position of the chair different from that of the positioning hole of the stopper pin receiver. The linkable chair according to any one of claims 1 to 5.

7. The stopper pin receiver is detachably attached to the exposed surface of the chair by a fixing member. The linkable chair according to any one of claims 1 to 6.

8. The rotation position restraint unit is detachably attached to the exposed surface of the base by a fixing member. The linkable chair according to any one of claims 1 to 7.

9. The rotation position restraint unit is detachably attached to the exposed surface of the base by a fixing member, the rotation position restraint unit is detachably mounted on the exposed surface of the base by a fixing member; The linkable chair according to any one of claims 1 to 8.

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