JP2014004321A - Chair capable of nesting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a comfortable nesting chair with high flexibility in design.SOLUTION: A chair comprises a leg device, a seat 2, and a seatback 3. In the leg device 1, a height and an opening angle of branch legs are designed so that the chair can be nested back and forth. The seatback 3 tilts backward around a first spindle 12 arranged at an upper front end of each of support frames 9. The seat 2 is attached to a movable base 14 so as to be slidable back and forth, the movable base 14 being joined to the support frames 9 so as to be turnable by being flipped up. When the seatback 3 is tilted backward, the seat 2 moves forward. Since the seat moves forward when the chair is rocked, the chair can give excellent relaxation even if it is capable of nesting. The seatback 3 and the seat 2 are joined to the support frames 9 whose arrangement position and form can be freely determined, thereby increasing flexibility in design of the chair.

Description

  The present invention relates to a nestable chair (movable chair), and is particularly suitable for a rocking rotary chair.

  In order to save storage space when the chair is not in use, fitting the chairs horizontally (nesting) is widely performed. This type of nestable chair is often called a pipe chair, but Patent Document 1 discloses that a swivel chair frequently used in an office has a nestable structure.

  Specifically, in Patent Document 1, first, the leg has four front and rear legs, the height of the front two legs is lower than the height of the two rear legs, By setting the spread angle of the two front legs smaller than the spread angle of the two rear legs, the leg devices arranged at the front and back are set to fit.

  Next, the backrest is attached to the left and right laterally fixed bases provided at the upper end of the leg strut (gas cylinder) via the left and right back frames, and resists rocking of the backrest with the torsion bar built in the fixed base. Is granted. Then, a bearing bracket that fits rotatably on a support shaft provided on the fixed base is provided in a substantially lower middle portion of the lower surface of the seat so as to protrude downward, thereby allowing the seat to flip up and down. . Therefore, the center of turning up of the seat and the center of tilting of the backrest are concentric.

  In Patent Document 1, since the front and rear intermediate portions of the seat are connected to the fixed base, the lower half of the seat is positioned below the lower end of the back and the fixed base with the seat flipped up. Further, a space for allowing the steel plate portion of the seat to rotate downward is vacant behind the fixed base.

  While the seat can rotate horizontally with respect to the leg device, the leg device during nesting has directionality. Therefore, consideration is given to a posture in which the leg device can be nested when the seat is flipped up. Also, when the seat is flipped up, the lock of the gas cylinder is released and the seat is set to rise to the highest position, thereby ensuring the deepest fit and each chair in the nesting state The height is aligned to make it look good.

Japanese Patent No. 3730119

  As described above, the nesting of the chair is to reduce the storage space when not in use, and conventionally, there are many simple structures such as a pipe chair. However, with a simple structure, the sitting comfort when sitting for a long time was not good. The rocking of the back is a big factor in sitting comfort, and even in pipe chairs, the frame material is bent to give it a slight locking property, but the frame material is bent and deformed. Since the rocking angle is negligible with the use of, it can be said that it does not contribute much to the improvement of sitting comfort when sitting for a long time.

  In this regard, when the configuration of Patent Document 1 is adopted, the backrest is largely rocked in the same manner as an ordinary swivel chair. However, Patent Document 1 has a problem that the tilting fulcrum of the backrest and the flip-up rotation fulcrum of the seat are concentric, so that there is almost no freedom in design and the application range is low.

  Also, if you use the pipe chair for a long time, you get tired because the user does not follow the backrest or seat, and the movement of the body is restrained by the chair. In the swivel chair, the backrest locks and the seat also moves in conjunction with the back tilt of the back, so the back and seat followability to the user's movement is high, and even if it is used for a long time, it is hard to get tired, In Patent Document 1, the backrest only locks, and even if the backrest is locked, the position / posture of the seat does not change.

  The present invention has been made in view of such a current situation, and aims to contribute to an improvement in sitting comfort as well as an increase in design freedom in a nestable rocking chair.

  The present invention relates to a nestable chair and includes the structure of each claim. Of these, the invention according to claim 1 is characterized by a plurality of leg devices that can be fitted in the horizontal direction, a backrest that can be tilted backward, and a pivot that is located at a portion different from the tilting fulcrum of the backrest. And a seat that can be turned up and down. According to a second aspect of the present invention, in the first aspect, the backrest and the seat are connected to a common member so as to be rotatable while changing their positions. In addition, in Claim 1, a backrest and a seat can be attached to a leg apparatus directly, or can be attached to the support member provided in the leg apparatus.

  According to a third aspect of the present invention, there is provided a chair according to the invention as a premise, a leg device capable of fitting a plurality of members in a horizontal direction, a backrest attached to the leg device directly or via a support member, and the leg device. And a seat attached directly or via a support member, and the seat can be flipped up and rotated so that nesting in the horizontal direction is possible.

  In the above premise configuration, a support frame projecting upward is provided on the leg device or a fixed base provided on the leg device, and the backrest or the seat or both are directly or via an intermediate member on the support frame. It is pivotally connected.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the leg device or a fixed base provided thereon is provided with a support frame protruding upward, and the backrest or seat or Both are pivotally connected directly or via an intermediate member.

  According to a fifth aspect of the present invention, in the third aspect, the support frame rises upward on the left and right outer sides of the seat, and the backrest and the seat are directly or at a position higher than the seat surface of the support frame. The intermediate member is pivotally connected.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the support frame rises upward on the left and right outer sides of the seat, and the backrest and the seat are formed from the seat surface of the support frame. Is also connected to a high position so as to be rotatable directly or via an intermediate member.

  A seventh aspect of the present invention provides the support frame according to any one of the first to sixth aspects, wherein the support frame has a back column that rises upward behind the seat, and the backrest is disposed at an upper end portion of the back column. The height position is connected in the middle of the upper and lower sides, and the seat is connected to a position lower than the rotation fulcrum of the backrest.

  According to an eighth aspect of the present invention, in the configuration of the premise of the third aspect, a back frame to which the backrest is attached as the support member is connected to the leg device or a fixed base provided thereon so as to be tiltable rearward. The seat is connected to the back frame so that it can be turned up and down.

  Further, the invention according to claim 9 is the structure according to the premise of claim 3 described above, and the back frame to which the backrest is attached as the support member is connected to the leg device or the fixed base provided thereto so as to be tiltable rearwardly. The seat is connected to the leg device or the fixed base via a link so as to be flipped upward.

  In the first aspect of the invention, since the backrest and the seat rotate around a fulcrum (rotation axis), the flexibility of the mounting position of the backrest and the seat is expanded, and thus the freedom of design. Can contribute to functional improvement. Although the backrest and the seat can be connected to separate members, connecting to a common member as in claim 2 is preferable because the structure can be simplified.

  Since the backrest or the seat is attached to the support frame in the same manner as in the first aspect, the flexibility of the attachment position of the backrest or the seat is expanded. For this reason, the freedom of design can be improved and the function can be improved.

  If the backrest is connected to the support frame at a position higher than the seating surface as in claim 4, the backrest can obtain as large a rearward tilt angle as possible without greatly retreating the upper end of the backrest. When it is, it can suppress annoying the person behind.

  That is, when the pivot point of the backrest is at a position higher than the seating surface (preferably a position higher than the waist of the seated person), the lower end of the backrest moves forward by tilting backward, so that it tilts backward while moving backward as a whole. Compared to the case, even if the rearward tilt angle is the same, the receding dimension of the upper end of the backrest is shortened, and this suppresses the human head and shoulders from being greatly antibodyd (curved) behind the seat when rocking. Thus, it is possible to effectively use the space by reducing the distance between the front and rear of the chair as much as possible while ensuring a comfortable and comfortable state without causing discomfort to the person behind.

  In addition, if the pivot point of the backrest is below the seating surface, the load on the upper body of the seated person acts as a large moment on the backrest when locking, so to obtain an appropriate resistance to locking, Accordingly, it is necessary to adjust the hardness of the spring, but if the pivot point of the backrest is set higher than the seating surface as in claim 2, the pressing force of the entire upper body of the user is a moment with respect to the backrest. In the state where the upper body of the user is supported around the rotation fulcrum, the backrest is merely rotated by the pressing force of only the upper part of the upper body. For this reason, even if the weight of the user is different, the force to tilt the backrest backward is not so different. Therefore, even if a locking spring hardness adjusting means is not provided, it is possible to give the same level of locking resistance to users with different weights (that is, the spring hardness is automatically responsive to the weight of the user). It will be the same as you do.)

  Further, when the seat is connected to the support frame at a position higher than the seating surface as in claim 5, even if the backrest is a high-back specification, the height of the seat can be adjusted to the height of the backrest, Contribute to improving the aesthetics of the condition.

  If the tilting fulcrum of the backrest is made higher than the seating surface, the lower end of the backrest tends to move forward when rocking, so that the seated person's waist (or buttocks) may be pushed from behind, as in claim 6 When the interlocking means is provided, the lower body of the user moves forward at the time of locking, so that it can be held in an appropriate relaxed state. Thereby, although it is a rocking chair in which nesting is possible, the sitting comfort can be improved.

  Also in the invention of claim 8, when the seat is flipped up, the entire leg device or the fixed base is exposed, so that the structure of the fixed base can be freely designed. For this reason, the freedom of design also becomes high as the whole chair. Further, according to the fifth aspect, when the seated person leans on the backrest, the seat moves backward, so that the followability between the body and the seat can be improved, and as a result, the sitting comfort can be improved. In general, when the pivot point of the backrest is below the seat surface, it is preferable to retract the seat in conjunction with the backward tilting of the backrest.

  In the invention of claim 9 as well, since the fixed base is exposed as a whole when the seat is flipped up, the structure of the fixed base can be freely designed. For this reason, the freedom of design also becomes high as the whole chair.

(A) (B) is a perspective view of the chair concerning a 1st embodiment. (A) is a side view in a neutral state, (B) is a side view in a rocking state. (A) is a perspective view in a state where the seat is flipped up, (B) is a front view of the leg device. It is a side view which shows a nesting state. It is the whole separation perspective view of a chair. (A) (B) is the whole perspective view in the state where a cushion was omitted. It is a partial separation perspective view for showing the support mechanism of a seat. (A) is the perspective view in the state which turned over the seat, (B) is the isolation | separation perspective view of a seat. (A) is a partially separated perspective view of a fixed base portion, and (B) is a separated perspective view showing a guide mechanism of a seat. (A) is a partially separated front view showing a guide mechanism of a seat, (B) is a partially broken and separated side view in a locking state. It is a schematic diagram which shows 2nd Embodiment, (A) is a side view of a neutral state, (B) is a side view of a rocking state, (C) is a side view of the state which raised the seat. It is a schematic diagram which shows 3rd Embodiment, (A) is a side view of a neutral state, (B) is a side view of a rocking state, (C) is a side view of the state which raised the seat. It is a schematic diagram which shows 4th Embodiment, (A) is a side view of a neutral state, (B) is a side view of a rocking state, (C) is a side view of the state which raised the seat. (A) is a figure which shows 5th Embodiment typically, (B) (C) is a schematic diagram of 6th Embodiment, (B) is a side view, (C) is a partial front view. It is a typical side view of a 7th embodiment. It is a front view of the leg apparatus concerning an 8th embodiment. It is a perspective view of the chair which concerns on 9th Embodiment, (A) is the whole perspective view of the state which fell down the seat, (B) is the whole perspective view in the state which flipped up the seat, (C) is the part of the backrest FIG. The perspective view of the state which isolate | separated the seat, (B) is a perspective view of a seat receiving part. It is a separation perspective view in the state where a seat was omitted. It is a separation perspective view showing a locking mechanism. (A) is a partially separated perspective view of a seat part, (B) is a figure which shows the relationship between a slider and a support stay, (C) is CC sectional view taken on the line of (B). It is a partially separated perspective view which shows the support mechanism of a seat. (A) is a separated perspective view showing the relationship between the movable base body, the slider and the spring unit, (B) is a separated perspective view of the rear spring receiver and the movable base body, and (C) is a perspective view of the rear spring receiver. . (A) is a separated perspective view showing the relationship between the seat and the slider, (B) is a partial perspective view from the bottom of the rear of the seat, and (C) is a partial perspective view of the rear of the seat as seen from above. It is a bottom view which shows the relationship between a slider, a support stay, and a seat. (A) is the isolation | separation perspective view which shows a part of interlocking | linkage part, (B) is the partial front view of an interlocking | linkage part similarly. 24A is a cross-sectional view taken along line AA in FIG. 24B, FIG. 25B is a partially enlarged view of FIG. 24A, and FIG. 26C is a cross-sectional view taken along line BB in FIG. (A) is a side view for showing movement, (B) is a separated side view showing the relationship between the flip-up rotation fulcrum and the pushing position of the support stay. It is a perspective view of 10th Embodiment applied to the rotation chair.

(1). Outline of First Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. First, the outline of the first embodiment will be described with reference to FIGS. In the following description, the words “front and rear” and “left and right” for specifying the direction are used, but this is based on a state viewed from a person who normally sits on a chair.

  The chair includes a leg device 1, a seat 2, and a backrest 3 as major elements. The leg device 1 includes a leg column 4 made of a gas cylinder, a center tube 5 that holds the leg column 4, and two front and rear branch legs 6a and 6b that are fixed to the center tube 5 by welding or the like. A caster 7 is attached to the tip of each branch foot 6a, 6b.

  The branch legs 6a and 6b extend in a radial direction from the central tube 5 and are inclined downward from the central tube 5, and their tips are bent in a vertical posture. Then, as clearly shown in FIG. 3B, the height of the front two limbs 6a is made lower than the height of the two rear limbs 6b, and the spread angle of the two front limbs 6a is increased. By making the angle smaller than the spread angle of the two rear legs 6b, the leg devices 1 arranged at the front and rear are allowed to fit each other.

  A box-shaped fixed base 8 that is horizontally long and opened upward is attached to the upper end of the leg support 4, and support frames 9 that protrude to the upper side of the seat 2 are respectively attached to the left and right ends of the fixed base 8. It is fixed. As shown in FIG. 5, a first bracket 10 having an L shape in plan view is fixed to the left and right sides of the lower portion of the backrest 3, and a second bracket 11 having a substantially triangular shape in side view is fixed to the outer surface of the first bracket 10. The front end of the second bracket 11 is connected to the upper end of the support frame 9 by the first support shaft 12. Therefore, the backrest 3 can tilt backward about the first support shaft 12. The first bracket 10 and the second bracket 11 correspond to the intermediate member recited in the claims.

  As shown in FIG. 3, a movable base body 14 is connected to a portion of the left and right support frames 9 that is lower than the first support shaft 12 from the rear portion so as to be flipped up and rotated by a second support shaft 15. The seat 2 is attached to the base body 14 so as to be movable back and forth. The movable base body 14 corresponds to an intermediate member recited in the claims.

  For example, as can be understood from FIG. 1 (A), the vertically long main driving arm 16 is fixed to the rear surface of the first bracket, and the pusher plate 17 is fixed to the lower end of the main driving arm 16, while the rear portion of the seat 2 is fixed. Of these, an upward driven arm 18 is fixed to a portion located in front of the main driving arm 16, and left and right auxiliary plates 19 are fixed to the upper end of the driven arm 18, and the driven pins 20 inserted through the left and right auxiliary plates 19 are pushed. The plate 17 is set so as to hit from behind. Therefore, as shown in FIG. 2, when the backrest 3 tilts backward, the pusher plate 17 moves forward, and the seat 2 moves forward accordingly. Although details will be described later, the seat 2 is urged in a backward direction by a spring provided on the movable base body 14, and this spring acts as a resistance against rocking.

  As can be seen from the above description, in this embodiment, the seat advances in conjunction with the backward tilting of the backrest 3 in the use state. And when not in use, the seat 2 is flipped up and rotated as shown in FIG. 3 (A) and FIG. In the present embodiment, the main drive arm 16, the pusher plate 17, the driven arm 18, the auxiliary plate 19, and the driven pin 20 constitute interlocking means described in the claims.

(2). Fixed base / backrest and its mounting structure Next, details of each part will be described with reference to FIG. First, the structure of the fixed base 8 and the backrest 3 and its mounting structure will be described. For example, as shown in FIG. 3, the fixed base 8 has a box-like shape opened upward, and a center bracket 23 is fixed to the left and right intermediate portions, and the bush is fixed to the bottom plate and the center bracket 23 by welding. The upper end of the leg support 4 is fitted from below (not shown).

  A horizontally long support bracket 24 that covers the center bracket 23 is fixed to the fixed base 8, and the movable base body 14 is stably supported by the support bracket 24. A space having an attitude between the center bracket 23 and the support bracket 24 is open, and a gas cylinder operation member is disposed in this space. The gas cylinder operating member is operated by a wire inserted through the tube, and although not shown, an elevating lever for pulling the wire is provided on the seat.

  The left and right side plates 8a constituting the fixed base 8 are inward from the left and right end surfaces, and the support frame 9 is fixed to the left and right side plates 8a by screws or welding. The support frame 9 is in a vertical posture after rising from the fixed base 8 in a backward inclined posture, and a forward projecting portion 9a is provided at the upper end. The second bracket 11 fixed to the backrest 3 is connected to the front end portion of the forward projecting portion 9a. The movable base body 14 is connected to the vertical portion of the support frame 9.

  In the present embodiment, the fixed base 8 has a lateral length slightly longer than the lateral width of the seat 2, but is set to a lateral width that is, for example, about 1/4 of the lateral width of the seat 2, and the support frame 9. It is also possible to provide an inward portion that attaches to the fixed base 8 below the seat 2. Further, the fixed base 8 can be an aluminum die cast product or a resin molded product, and a portion corresponding to the support frame 9 can be integrally provided on the fixed base 8.

  As shown in FIGS. 5 and 6, the backrest 3 has a resin back plate (inner shell) 25, and cushions 26 (see FIG. 1A) are stretched on the front and rear surfaces of the back plate 21. Is covered with a skin material 27 (same as above) such as a cloth. Needless to say, the cushion 26 may be disposed only on the front surface of the back plate 25.

  For example, as shown in FIG. 5, the back plate 25 is fixed to the first bracket 10 with screws (not shown). Parts corresponding to the first bracket 10 and the second bracket 11 can be integrally formed with the back plate 25. The main driving arm 16 is fixed to the rear surface of the first bracket 1 by screws or welding, but portions corresponding to the main driving arm 16 and the pushing plate 19 may be integrally formed with the back plate 23.

(3). Seat and its mounting structure Next, the seat 2 and its mounting structure will be described in detail. As shown in FIG. 5, the movable base body 14 has left and right side plates 14a and has an upward U-shape, and a third bracket 33 having left and right standing portions 33a is screwed to the lower surface of the rear portion. The upright part 33a is connected to the upper and lower middle part of the support frame 9 by a horizontally long second support shaft 15 so as to be rotatable. The movable base body 14 may be a molded product of resin or aluminum, and the upright portion 33a may be provided integrally with the movable base body 14.

  As shown in FIG. 8B, the seat 2 has a resin upper seat plate 34 and a lower seat plate 35 whose peripheral edges overlap with each other, and a cushion (see FIG. 1A) 36 is provided on these. The cushion 36 is covered with a skin material 37 such as a cloth. The upper seat plate 34 and the lower seat plate 35 are held inseparable. As shown in FIG. 8A, a longitudinally movable rail 45 is disposed inside the side wall 40 of the lower surface of the lower seat plate 34, and the movable rail 45 is provided at a plurality of locations such as a front end portion and a rear end portion thereof. In FIG. 4, the lower seat plate 35 is fixed with screws (not shown).

  As shown in FIG. 10, the movable rail 45 has a U-shape that opens outward in a front view, and a resin-made slider 46 is disposed therein. The slider 46 opens to the left and right outside in a front view. As shown in FIG. 9, an inward flange 47 is provided at the upper end of the left and right side plates 14 a of the movable base body 14, and the slider 46 is attached to the flange 47. It is fitted.

  As shown in FIG. 8, the rear end portion of the substantially vertical posture substrate 45 a constituting the movable rail 45 protrudes behind the lower seat plate 35. For this reason, the rear wall 43 of the lower seat plate 35 is formed with a notch 48 into which the substrate 45a is fitted. As shown in FIG. 5 and FIG. 10 (B), a square-tube driven arm 18 is fixed to the rear end of the movable rail 45 by welding. In order to ensure the accuracy of the alignment between the two, a protrusion 49 is provided on the movable rail 45 and an engagement hole 50 is provided on the driven arm 18 to fit the two together.

  Note that the driven arm 18 and the auxiliary plate 19 may be provided integrally with the movable rail 45. It is also possible to provide the driven pin 20 or a part that exhibits the same function as the driven arm 18 integrally. It is also possible to provide an element that exhibits the same function as the movable rail 45 integrally with the lower seat plate 35 and fix the driven arm 18 to the lower seat plate 35 with screws or the like.

  As shown in FIG. 10, a fixed rail 51 is fixed to the portion of the upper surface of the movable base body 14 in the vicinity of the left and right side plates 14 a by using an upwardly-opening U-shape and fixed by screws or welding. A spring receiver 52 having a U-shape facing forward in plan view is fixed to the end portion by welding or the like, and a spring (compression coil spring) 53 is interposed between the front surface of the spring receiver 52 and the driven arm 18. Therefore, as shown in FIG. 9, when the backrest 3 tilts backward, the driven arm 18 is pushed via the driven pin 20, so that the seat 2 moves forward against the elasticity of the spring 51. A rod 51 ′ is passed through the spring receiver 52 from the front, and the tip of the rod 51 ′ is inserted and fixed to the driven arm 18. The retracted position of the seat 2 is regulated by the rod 51 ′.

  The side plate 44 of the lower seat plate 35 is set on the inner plate 51 a of the fixed rail 51. Accordingly, an excessive load does not act on the movable rail 45 or the side plate 14a of the movable base body 14. As described above, the movable base body 14 can employ a molded product of aluminum or resin. In this case, it is preferable to integrally mold an element corresponding to the fixed rail 51 on the movable base body 14.

(3). Summary As described above, when a person sitting on the chair leans on the backrest 3, the seat 2 moves forward, and the user of the chair tends to stretch in a rocking state. For this reason, although it is a chair which can nest up by raising the seat 2, a high relaxation effect can be obtained and it is excellent in sitting comfort.

  Nesting chairs are often grounded at conference halls and training venues, and in such venues, there is a tendency to reduce the distance between the chairs as much as possible, but the tilting fulcrum of the backrest 3 is seated as in this embodiment. If the seat is positioned higher than the surface and in front of the rear end of the seat 2, a large rocking angle can be obtained while suppressing the backward movement of the upper end of the backrest 3 as much as possible. Even if it is installed, it can prevent unpleasant thoughts on the back when locking. This is an advantage of the present embodiment.

  In addition, the present embodiment is provided with the movable base body 14 so that the seat 2 can be moved forward while securing the nesting function. This is also one of the major features. Further, when the upright portion 33a that protrudes upward from the rear end of the movable base body 14 is connected to the support frame 9, the seat 2 can be flipped up and rotated to a rearward tilted posture. There is also an advantage that stability can be secured.

  Although not shown in the drawing, an elbow rest can be provided on the forward facing portion 9 a of the support frame 9. In addition, when the seat 2 is flipped up, the posture correcting device that changes the relative posture between the fixed base 8 and the leg device 1 into a nestable state, and when the seat 2 is flipped up, the leg support is changed to the free state and the seat 2 is at its highest. It is preferable to provide a height aligning device for raising the height.

(4). Other Embodiments Next, other embodiments will be described. First, a second embodiment shown in FIG. 11 will be described. This second embodiment corresponds to claim 8, and the upper and lower middle portions of the backrest 3 are connected to the upper end portion of the support frame 9 by the first support shaft 12, and the lower end portion of the backrest 3 and the back of the seat 2 are connected. The upright portion 2 a provided at the end is connected by the second support shaft 15. Also in this embodiment, since the lower end of the backrest 3 is moved forward by tilting, the seat 2 moves forward during locking. In this embodiment, the second support shaft 15 also serves as interlocking means. The seat 2 is directly connected to the backrest 3, but it is also possible to connect the movable base body to the backrest 3 and attach the seat 2 to the movable base body.

  The third embodiment shown in FIG. 12 also corresponds to claim 8. In this embodiment, the back frame 55 to which the backrest 3 is attached can be tilted rearward to the rear portion of the fixed base 8 by the first support shaft 12. In a configuration in which the backrest 3 is attached to the back frame 55, an upward link portion 56 is provided at the front end portion of the back frame 55, and the upper end of the link portion 56 and the downward projection 57 of the seat 2 are connected to the second support 56. Further, a supported portion 58 and a supporting portion 59 that are connected by the shaft 15 and abut against the lower surface of the seat 2 and the upper surface of the fixed base 8 are provided. The contact surface between the supported portion 58 and the support portion 59 forms an inclined surface (cam surface) whose height increases as going backward.

  The fixed base 8 incorporates spring means, and the backrest 3 tilts backward against the spring means, but the contact surface between the supported portion 58 and the support portion 59 is an inclined surface. The seat 2 moves backward while ascending. In this case, since the force to lift the seat 2 is proportional to the user's physique, it is possible to provide the same locking stiffness to persons of different physiques without adjusting the stiffness of the spring means. That is, the magnitude of the resistance to rocking is sensitive to weight. In this embodiment, the link part 56 comprises the interlocking means.

  The fourth embodiment shown in FIG. 13 corresponds to the ninth aspect, and this embodiment also makes the resistance to rocking sensitive to the weight of the user. In this embodiment, the front end of the back frame is connected to the fixed base 8 by the first support shaft 12, while the seat 2 has a downward projection 60 provided at the rear portion thereof fixed via the link 61. It is connected to the base 8. Then, an extending portion 55a is provided at the front end of the back frame 55, and a bearing portion 63 having a downward opening in the side view provided on the lower surface of the seat 2 is placed on the Froton pin 62 mounted between the front ends of the left and right extending portions 55a. It is inserted from.

  The connection height position of the back frame 55 with respect to the fixed base 8 and the connection height position of the link 59 with respect to the fixed base 8 are set to substantially the same height. For this reason, the extension portion 55a of the back frame 55 and the link 61 has the same structure as the parallel link mechanism. Therefore, when the backrest 3 tilts backward, the seat 2 moves backward while being raised. Since the force for raising the seat 2 is substantially proportional to the weight of the user, the stiffness of the spring means for rocking is kept constant even when the weight is different. The spring means is built in the fixed base 8. In this embodiment, the link 59 and the extending portion 55a constitute interlocking means.

  The fifth embodiment shown in FIG. 14 (A) also corresponds to claim 8, and the seat 2 is flipped up by the second support shaft 15 to the back frame 55 connected to the fixed base 8 so as to be able to tilt backward. It is attached freely. Further, a supported portion 58 projecting downward on the lower surface of the seat 2 is brought into contact with the upper surface of the fixed base 8. Accordingly, the seat 2 moves backward during locking, but the support surface 66 of the fixed base 8 is set to an inclined surface that becomes lower as going backward, so that the rearward tilt angle associated with the backward movement of the seat 2 can be reduced or The tilt angle can be made zero. In this embodiment, the 2nd spindle 15 comprises the interlocking means.

  The sixth embodiment shown in FIGS. 14 (B) and 14 (C) also corresponds to claim 8, and the backrest 3 is attached to the back frame 55 connected to the fixed base 8 so as to be able to tilt backward, and the back frame 55 is attached to the back frame 55. The intermediate member 67 whose upper end extends to the outside of the rear side surface of the seat 2 is fixed, and the intermediate member 67 and the seat 2 are connected to each other by a third support shaft 68 that is horizontally long. Further, a left and right horizontally long slide shaft 69 on which the back frame 55 is pulled is attached to the fixed base 8, and the backward movement of the slide shaft 69 is supported by spring means built in the fixed base 8.

  Then, the slide shaft 69 is protruded to the left and right outer sides of the fixed base 8, and a bearing bracket 70 provided on the lower surface of the seat 2 is fitted into the protruding end portion from above. Therefore, in this embodiment, when the backrest 3 tilts backward, the seat 2 tilts backward while retracting. Since the bearing bracket 70 opens downward, the seat 2 can be flipped upward. In this embodiment, the intermediate member 67 and the bearing bracket 70 constitute interlocking means.

  The seventh embodiment shown in FIG. 15 corresponds to claim 9 and extends above the first support shaft 12 at the front end of the back frame 55 when the backrest 3 is attached to the rotary back frame 55. While the standing portion 55 b is provided, the seat 2 (or the movable base body 14) is connected at its rear portion to the fixed base 8 by a bell crank type link 56, and the portion of the link 56 behind the rotation fulcrum is connected to the back. The standing portion 55b of the frame 55 is connected with a pin. In this embodiment, the seat 2 moves forward when the backrest 3 tilts backward. The seat 2 may be directly attached to the link 56.

  In FIG. 16, the leg apparatus 1 of the type which does not have the raising / lowering function of the seat 2 is displayed as 8th Embodiment. In this leg device 1, four front and rear branch legs 72 a and 72 b are fixed to a head 69 constituting the upper end, and a fixed base 8 is rotatably mounted on the head 71. Therefore, in the chair having the leg device 1, the seat 2 and the backrest 3 are horizontally rotatable, but do not have a height adjusting function.

(5). Outline of Twelfth Embodiment Next, a ninth embodiment will be described with reference to FIGS. First, an outline of the chair will be described mainly with reference to FIGS. The words “front and rear” and “left and right” are based on a state viewed from a person who normally sits on a chair as in the previous embodiment. The reference numerals of this embodiment are given independently of the previous embodiments. Therefore, the members with the same reference are almost different.

  As shown in FIG. 17, the chair includes a leg device 1, a seat 2, and a backrest 3 as large elements, and the seat 2 is attached to a flip-up turnable movable base body 4. Therefore, the seat portion 5 is configured with the seat 2 and the movable base body 4 as main elements. As shown in FIG. 17 (A), the seat 2 includes a resin seat plate (seat inner shell) 6 and a seat cushion material 7 stretched on the upper surface thereof. Covered with material 8. The movable base body 4 can also be called a pivoting base or a flip-up base. As shown in FIGS. 18 to 20, a large number of reinforcing ribs 9 are provided on the upper surface of the movable base body 4.

  The leg device 1 is made of a metal pipe such as a steel pipe or an aluminum pipe (therefore, this embodiment is applied to a so-called pipe chair), and has four legs having left and right front legs 10 and left and right rear legs 11. It is a method. Casters 12 are attached to the front and rear legs. At the upper end of the front foot 10, an upper side portion 14 extending rearward in a posture slightly tilted forward with respect to the horizontal is formed by bending, and the rear end of the upper side portion 14 is butted against a portion closer to the upper end of the rear foot 11. It is fixed with.

  The front ends of the left and right upper side portions 14 are connected by a laterally long horizontal hook 15. The recumbent rod 15 also has a function of supporting the seat portion 5 that has been tilted forward, and is bent gently in an upwardly convex shape in front view so that the left and right intermediate portions are raised. The rear foot 11 is in a forward leaning posture in a side view so as to be shifted toward the front as it goes upward, and is curved with a gentle curvature. As shown in FIG. 17B, a recess 4 a is formed on the lower surface of the movable base body 4 in which the left and right intermediate portions of the horizontal bar 15 are fitted.

  The upper end of the rear foot 11 is a free end, and the upper support shaft 17 whose axis is horizontally horizontal is fixed to the upper end by welding, and the backrest 3 is attached to the upper support shaft 17 via the upper screw 18 in the rear. It is connected so that it can tilt. Therefore, in the present embodiment, the upper end portion of the rear foot 11 is a support frame 19 as an example of a support member for attaching the backrest 3 and the seat 2. Since the support frame is a part of the leg device 1, the present embodiment can also be viewed as the backrest 3 and the seat 2 being directly attached to the leg device 1. As described above, the rear foot 11 is tilted forward in a side view, and therefore, the upper support shaft 17 is positioned in front of the rear end of the seat 2.

  The left-right distance between the left and right hind legs 11 is larger than the left-right distance between the left and right front legs 10, so that the legs of the front and rear chairs can be fitted together (nested) with the seat 5 flipped up. It has become. For example, as clearly shown in FIG. 19, a stopper 20 is provided on the inner side surface of the rear foot 11 so that the front foot 10 of the back chair hits (fits) when the chair is nested. The stopper 20 is made of rubber or resin and has a buffer function and a positioning function.

  In addition, the form of the leg apparatus 1 can be set arbitrarily. Needless to say, nesting is also possible by making the distance between the left and right front legs 10 larger than the distance between the left and right rear legs 11. Each of the legs 10 and 11 can be manufactured from a solid bar or an elliptical tube. Of course, an aluminum die-cast product or a resin molded product can also be used.

  For example, as shown in FIG. 19, the movable base body 4 includes a box-shaped main body 21 that is rectangular in plan view and a rectangular arm 22 that protrudes upward while spreading outward from the rear portion of the main body 21. . The movable base body 4 is a resin molded product (may be an aluminum die-cast product), and the square arm 22 is provided integrally with the main body 21. In addition, since the main-body part 21 is box-shaped, the outer periphery is comprised with the surrounding wall.

  The square arm 22 is basically a plate that is wide in the front-rear direction, but the front-rear distance decreases as it goes up, and a boss portion (bearing portion) 23 that protrudes outward in the left-right direction is integrally provided at the upper end. The boss 23 is connected to the middle part of the support frame 19 so as to be rotatable by a lower support shaft 24, a lower bush 25 and a lower screw 26. Therefore, the movable base body 4 can be swung up and rotated around the axis 27 of the boss portion 23, whereby the seat portion 5 is flipped up (folded) as shown in FIG. A) state. The center of gravity of the seat portion 5 is located behind the axis 27 of the boss portion 23 and the lower support shaft 24 in a state where the seat portion 5 is flipped up. The lower support shaft 24 is fixed to the support frame 19 by welding. The head of the lower screw 26 is covered with a lower cap 28.

  As shown in FIG. 17C, the backrest 3 includes a backrest main body (main frame) 29 that is largely open in the front-rear direction, and a support body 30 that is attached to the backrest main body 29 so as to cover the opening. Yes. Although the back cushion material 31 is stretched on the front surface of the support body 30, the support body 30 may be left exposed without providing the back cushion material 31. The backrest body 29 and the support body 30 are resin molded products.

  An outward projecting portion 29a projecting outward in the left and right directions is formed in a lower portion of the backrest body 29, and a bearing portion 32 that fits the upper support shaft 17 is formed at the outer end of the outward projecting portion 29a. doing. A bush (not shown) is fitted to the bearing portion 32, and the backrest body 29 is held on the upper support shaft 17 so as not to be detached by screwing the upper screw 18 into the upper support shaft 17 from the inside. The head of the upper screw 18 is covered with an upper cap 33. The outward projecting portion 29a protrudes forward in plan view, and therefore the backrest 3 surrounds the seated person's waist from behind.

  When the backrest 3 is viewed in a longitudinal side view, the backrest main body 29 is bent so that the portion of the height position where the outwardly projecting portion 29a is provided is located in the foremost position. The height of the outwardly projecting portion 29a is set so as to be the height of the lumbar region (particularly around the third lumbar vertebra) when an average adult is seated. For this reason, the backrest 3 has a lumbar support function.

  The opening of the backrest main body 29 and the support body 30 form a front view form in which the lower part is rounded and is entirely constricted upward. Except for the peripheral edge portion of the support body 30, a large number of holes are opened side by side in the vertical and horizontal directions. For this reason, it has a lattice-like appearance in which a large number of vertical and horizontal lines cross each other. The peripheral portion of the support body 30 is fitted into the backrest body 29 and attached.

  Needless to say, it is also possible to attach the back cushion material 31 directly or via an inner member to the backrest body 29 as a configuration in which the backrest body 29 is not opened in the front-rear direction. Further, instead of the resin support body 30, a flexible mesh material can be stretched on the backrest main body 29. When the resin-made support body 30 is provided, various modes such as a mode in which horizontally long slits are formed in multiple stages can be adopted. The backrest 3 can also be composed of only the backrest body 29.

  When the backrest 3 tilts backward, the seat 2 moves forward. Therefore, the seat 2 is attached to the movable base body 4 so as to be slidable back and forth. Specifically, as shown in FIGS. 18 to 20, a pair of left and right sliders 36 are mounted on the movable base body 4 so as to be movable back and forth, and a seat plate 6 is mounted on the left and right sliders 36 so as not to move relative to the front and rear. . Accordingly, the seat 2 moves relative to the slider 36. As shown in FIG. 20, the forward movement of the slider 36 is elastically supported by a spring 37 (compression coil spring) as an example of an elastic support means. The spring 37 is supported by front and rear spring receivers 38, 39. The front spring receiver 38 is held by the movable base body 4 so as not to move forward and backward, and the rear spring receiver 39 is pushed by the slider 36 and moves forward.

  Furthermore, left and right horizontally long support stays 40 made of metal plates are fixed to the rear end portions of the left and right sliders 36 with screws 41, and upward passive arms 42 are bent at the left and right ends of the support stay 40. On the other hand, a pocket-shaped pushing part (holder part) 43 that fits on the passive arm 42 of the support stay 40 from above is provided at the lower end of the backrest body 29. A resin crown member 44 is attached to the upper end of the passive arm 42. The crown member 44 is for dispersing the reaction force to the pushing portion 43 and smoothing the movement.

  In the chair of the present embodiment, when the backrest 3 is locked by the seated person's leaning, the slider 36 moves forward via the support stay 40, whereby the seat 2 is synchronized (synchronized) with the locking of the backrest 3. Advance.

  Therefore, although the chair of this embodiment is a chair that can be nested, the seat 2 moves forward in conjunction with the locking of the backrest 3. Since the slider 36 is biased in the backward direction by the spring 37, it is sufficient for the pushing portion 43 to have a function of pushing the passive arm 42. Therefore, for example, the backrest body 29 of the backrest body 29 is not formed in a pocket shape. It is also possible to function as the pushing portion 43 by thickening a part of the lower portion. In this embodiment, the pushing portion 43 and the passive arm 42 of the support stay 40 constitute interlocking means.

(6) Slide mechanism Next, details of each part will be described. First, the slide mechanism will be described mainly with reference to FIGS. 21 to 23 (the spring is omitted in FIG. 22). As described above, the movable base body 4 is provided with a pair of left and right sliders 36 to which the seat 2 is fixed.

  For example, as shown in FIGS. 22 and 23, the slider 36 has a groove shape with a longitudinal front and downward opening, and an outward front and rear flange 36b is bent at the lower end of the left and right side plates 36a. On the other hand, a pair of front and rear support protrusions 45 that the slider 36 covers are provided on the left and right side portions of the movable base body 4, and a roller 46 arranged with the shaft center acting horizontally is fitted to the upper end of the support protrusion 454 so as to be able to roll. I put it. The roller 46 is made of a resin having a small friction coefficient such as POM resin, and the slider 36 can be slid back and forth lightly and silently.

  The horizontal displacement of the slider 36 is regulated by an outer guide wall 47 provided on the movable base body 4 and front and rear inner guide protrusions 48. A guide stopper 49 is provided on the outer guide wall 47 and the front and rear inner guide protrusions 48 so as to be positioned on the front and rear flanges 36 b of the slider 36. For this reason, the slider 36 is held so as to be slidable back and forth without being movable upward. While there is a large space between the front and rear flanges 36b of the slider 36, there is also a large space between the front and rear guide stoppers 49.

  Therefore, the slider 36 is attached by inserting the flange 36b on the front side between the front and rear guide stoppers 49 from above with the slider 36 shifted from a predetermined position, and then shifting the slider 36 toward the flange 36b. Is carried out by a procedure in which the guide stopper 49 is positioned below. A certain amount of space is provided between the flange 36b of the slider 36 and the bottom surface of the movable base body 4. Therefore, the movable base body 4 is provided with reinforcing ribs 9 adjacent to the flange 36b of the slider 36.

  The spring 37 and the front and rear spring receivers 38 and 39 are formed as one unit, and the front spring receiver 38 cannot be displaced from front to back and left and right by the left and right holder pieces 50 provided on the rear surface of the support protrusion 45 located on the front side. Is retained. That is, as shown in FIG. 23, the front spring receiver 38 is sandwiched between the left and right holder pieces 50, and the rear end is in contact with the front support protrusion 45. A notch 51 is formed so that a groove is formed between the front spring receiver 38 and the front spring receiver 38 is provided with a lateral protrusion 38a that fits into the notch 51 from above. It is held so that it cannot be displaced in the direction and the front-back direction.

  Further, as clearly shown in FIG. 23, the front spring receiver 38 is formed with a forward piece 38b having a front end as a free end, and a stopper claw 38d is provided at the front end of the front piece 38c. Is inserted into a long groove 52 formed in the slider 36. The front end surface of the stopper claw 38d is in a vertical posture, and thus the retreat position of the slider 36 is restricted. Further, the rear surface of the stopper claw 38d is an inclined surface 38e that becomes lower as it goes rearward. For this reason, when the slider 36 is set shifted from the back to the front, the forward piece 38c is once bent downward and deformed. Return from and deform. Therefore, the slider 36 can be easily attached.

  On the other hand, as shown in FIGS. 22 and 23, a hanging piece 53 formed by cutting and raising the slider 36 is in contact with the rear spring receiver 39 from behind. The drooping piece 53 has a reverse T-shape in which a left and right outward projecting piece 53a is provided at the lower end thereof, while the rear spring receiver 39 has left and right portions sandwiching a portion excluding the lower end of the drooping piece 53 from the left and right. A restricting piece 39a is provided. For this reason, the slider 36 and the rear spring receiver 39 are held so as not to be rattled.

  A rod 39b extending forward is formed integrally with the rear spring receiver 39, and the front and rear spring receivers 38, 39 are removed by fitting the tip of the rod 39b into an engagement hole 54 provided in the front / rear spring receiver 38. Inability to hold relative movement. The spring 37 is pre-compressed (the pre-tension is applied) with the front and rear spring receivers 38, 39 being farthest apart. Therefore, as described above, the front and rear spring receivers 38 and 39 and the spring are formed as a single unit, which is convenient for handling such as storage and is easy to assemble.

(7). Relationship between Slider, Stay and Seat Plate Next, the relationship between the slider 36, the support stay 40 and the seat plate 6 will be described with reference to FIGS. 23 and 24 in addition to the previous drawings. As shown in FIGS. 21B and 21C, a rearwardly facing piece 36 d is provided at the rear end of the slider 36, and this is fixed to the support stay 40 with screws 41 and nuts (cap nuts) 58.

  Of the support stay 40, the fixed portion of the slider 36 is an upward bulging portion 40a, and the protruding piece 36c of the slider 36 is fixed to a stepped portion 40b formed as a recess in the upward bulging portion 40a. For this reason, the support stay 40 maintains high rigidity. It is also possible to screw the screw 41 directly into the support stay 40 without using the nut 58 (in this case, it is preferable to form a burring portion on the support stay 40 and screw the screw 41 into the burring portion. ). Note that the bulging portion 40a of the support stay 40 also extends to the passive arm 42, so that the strength of the passive arm 42 is significantly increased.

  As shown in FIG. 24, on the lower surface of the seat plate 6, a pair of front and rear downward restriction bodies 59 and 60 that hold the slider 36 from the left and right are provided. A restricting portion 59a that hits the front end face is provided. Further, the seat plate 6 is provided with a stopper claw 60 that contacts the rear end of the slider 36.

  The stopper claw 60 is formed at the rear end of the tongue piece 61 facing backward with the rear end as a free end, and the rear surface of the stopper claw 60 is an inclined surface 60a that goes higher as it goes rearward. For this reason, when the seat plate 6 is overlapped with the slider 36 and shifted backward, the stopper claw 60 escapes once and then returns and deforms to the rear end surface of the slider 36 located on the left and right outer sides of the projecting piece 36c. In this manner, the seat plate 6 is held so that it cannot be displaced from front to back and from side to side.

  Furthermore, a side-view-type rear engagement claw 62 that is fitted to the front edge of the support stay 40 from the front is provided on the lower surface of the seat plate 6. The rear engaging claws 62 are provided at three positions, the left and right intermediate portions and the left and right outer sides, and the rear portion of the seat plate 6 is held immovably upward from the support stay 40 by the presence of the rear engaging claws 62. The state in which the stopper claw 60 is engaged with the slider 36 is maintained.

  Needless to say, the mounting structure of the seat plate 6 can employ various means. For example, the slider 36 and the support stay 40 can be screwed. It is also possible to connect the left and right sliders 36 at their front portions with stays and attach seat plates to the front stays.

  In addition, as described with reference to FIG. 17C, the seat cushion material 7 is covered with the skin material 8, but the skin material 8 is formed with a cylindrical portion through which a string passes. It is attached to the seat plate 6 by squeezing the string. For example, as shown in FIG. 24B, an annular groove 63 into which a string is fitted is formed on the lower surface of the periphery of the seat 2. And although the string is tied up in the right and left middle part of the rear end part of the seat plate, there is a possibility that the beauty will be lost if the knot of the string is exposed when the seat 2 is flipped up.

  Therefore, for example, as shown in FIG. 24, a downwardly facing cover piece 64 is provided at the rear end of the seat plate 6 and the cover piece 64 is tilted to prevent the knot of the string from being exposed. The cover piece 64 is set so as to be flush with the lower surface of the seat plate 6 in a tilted state, and is held so as not to be raised by claw means (not shown).

(8). Seat Pushing Mechanism Next, a seat pushing mechanism accompanying locking will be described mainly with reference to FIGS. 26 and 27, the resin-made crown member 44 is attached to the upper end of the passive arm 42 in the support stay 40 as described above. The crown member 44 has a substantially circular shape in a side view, and is provided with a downward opening groove 75 into which the upper end of the passive arm 42 is fitted.

  Although the upper end of the passive arm 42 is also formed in a substantially arc shape in a side view, an engagement step portion 76 is formed on the front side and a notch 77 is formed on the rear side. A head 42a with a neck is formed at the upper end of the head. The crown member 44 is formed with a claw portion 44a that fits into the engagement stage of the passive arm 42. For this reason, the crown member 44 is held on the passive arm 42 so that it cannot be detached without rattling.

  The pushing portion 43 of the backrest body 29 is formed in a pocket shape as described above, and the left and right side plates 43a, the top plate 43b connected to the upper ends of the left and right side plates, and the upper and lower sides connected to the inside of the left and right side plates 43a as a pair. And a longitudinal middle plate 43c. An inward rib 43d is formed at the front end of the left right plate 43a, and the interval between the inward ribs 43d is set to a size that allows the passive arm 42 to pass but the crown member 44 does not come out. The head 42a and the crown member 44 of the passive arm 42 are located between the inward rib 43d and the middle plate 43c, and the backrest 3 is pushed by the passive arm 42 being pushed by the middle plate 43c via the crown member 44. The seat 2 moves forward in conjunction with the locking.

  The front surface of the intermediate plate 43c is a flat surface that extends straight in the left-right direction in plan view. For this reason, the crown member 44 can be pushed without being twisted. Since the middle plate 43c is provided in order to stably push the crown member 44 without being twisted, the space behind the middle plate 43c may be closed. That is, instead of providing the intermediate plate 43c, a stepped portion may be formed in the backrest body 29. As shown in FIG. 27, in the upper half of the middle plate 43c, there is no space behind and is substantially a stepped portion.

  As shown in FIG. 27, the backrest 3 rotates in the direction of the arrow 79 around the axis 78 of the upper support shaft 17, and the pushing portion 43 moves forward while moving downward. On the other hand, the support stay 40 only moves forward. Therefore, when the crown member 44 moves upward relative to the inside of the pushing portion 43 (by increasing the position of pushing the crown member 44 by the intermediate plate 43c), the forward movement of the seat 2 due to locking is permitted. Yes. When the body pressure on the backrest 3 is released, the support stay 40 is retracted by the spring 37, and then the pushing portion 43 is pushed by the crown member 44, and the backrest 3 returns and rotates.

  Now, a forward external force may be applied to the upper end of the backrest 3 in a state where the person is not leaning on the backrest 3. For example, when a person accidentally presses the upper end of the backrest 3 from behind while the chair is in the desk. For such a case, it is necessary to provide stopper means for holding the backrest 3 in a neutral state where the backrest 3 is not locked so that it cannot be tilted forward.

  However, in this embodiment, by providing the inward ribs 43d at the front ends of the left and right side plates 43a of the pushing portion 43, the inward ribs can be applied even if an external force is applied to the backrest 3 in the neutral state. Hitting the crown member 44 from time and effort, the forward tilt of the backrest 3 is prevented. Therefore, the forward tilt of the backrest 3 can be prevented without providing any special forward tilt prevention means. This is one of the advantages of this embodiment.

  Further, as shown in FIG. 28, since the rotation axis 27 of the movable base body 4 and the axis 80 of the crown member 44 coincide with each other, the movable base body 4 is accommodated in the pocket-shaped pushing portion 43. However, the movable base body 4 can be rotated without twisting.

  However, it is possible to shift the axial center 80 of the crown member 44 downward, forward, or forward and downward from the rotational axis 27 of the movable base body 4 by a very small dimension (for example, about 1 to 3 mm. Although the movable base body 4 rotates with a twist (that is, rotates with the fulcrum exceeded), the twist is absorbed by the elastic deformation of the backrest body 29 and the backrest 3 is bounced up. , The elastic restoring force of the backrest body 29 acts so that the backrest 3 tilts backward and pushes freely, so it is effective to maintain the bounced state. In the state, the center of gravity of the seat portion 5 is located behind the rotational axis 27 of the movable base body 4.

(9). Other Embodiments FIG. 29 shows an example applied to a swivel chair as in the first embodiment. In this example, left and right support frames 19 are provided on an elevating base 97 provided at the upper end of a leg column 96 made of a gas cylinder, and the backrest 3 and the movable base body 4 are rotatably connected to the support frame 98. A support portion 97 a for the movable base body 4 is provided at the front end of the elevating base 97. The connection structure between the backrest 3 and the movable base body 4 is the same as that of the above-described embodiment. The leg device 1 has two branch legs 101 and 102 each having a different mounting position with respect to the leg tube 99. For this reason, if the seat part 5 is flipped up, it can nest back and forth.

(10). Others The present invention can be embodied in various ways other than the above embodiment. For example, the form of the seat and the backrest can be arbitrarily set as necessary. Various springs such as a torsion bar and a leaf spring can be used as the spring means for imparting resistance to locking. It is also possible to provide locking means such as a gas cylinder for controlling the back tilt posture of the backrest. The backrest or the seat may have a structure in which a flexible sheet material such as a mesh is stretched around a frame material constituting the outer periphery of the backrest or the seat.

  The seat or intermediate member can also be connected to the backrest (in this case it is preferred to connect to the lower part of the backrest).

  The present invention can be manufactured as a chair. Therefore, it can be used industrially.

[First Embodiment]
1 leg device 2 seat 3 backrest 4 leg support (gas cylinder)
6 Branch leg 8 Fixed base 9 Support frame 12 First support shaft (back tilt center)
14 Movable base body (intermediate member)
15 2nd spindle (spinning up rotation center of seat)
Reference Signs List 16 Master arm constituting interlocking means 17 Pushing plate constituting interlocking means 18 Driven arm constituting interlocking means 20 Follower pin constituting interlocking means 23 Back plate 34, 35 Seat plate 45 Movable rail 51 Fixed rail 53 Spring 55 Back frame [9th embodiment]
1 leg device 2 seat 3 backrest 4 movable base body (intermediate member)
11 Rear foot 17 Upper support shaft 19 Support frame (leg support) as an example of a support member
DESCRIPTION OF SYMBOLS 21 Main body part of movable base body 22 Square arm of movable base body 23 Boss part of square arm 24 Lower support shaft 29 Backrest body 32 Backrest bearing part 36 Slider 37 Spring 40 Support stay 42 Passive arm 43 Pushing part

Claims (9)

A leg device capable of fitting a plurality of members horizontally, a backrest that can be tilted rearwardly, and a seat that can be swung up and rotated around a pivotal fulcrum located at a portion different from the tilting fulcrum of the backrest. Yes,
Nestable chair. The backrest and the seat are connected to a common member so as to be able to rotate by changing their positions.
The chair according to claim 1. A leg device capable of fitting a plurality of members in a horizontal direction; a backrest attached to the leg device directly or via a support member; and a seat attached to the leg device directly or via a support member. And is configured to be capable of nesting in the horizontal direction by flipping the seat up and turning,
A support frame protruding upward is provided on the leg device or a fixed base provided on the leg device, and the backrest or the seat or both are rotatably connected to the support frame directly or via an intermediate member. ,
Nestable chair. A support frame protruding upward is provided on the leg device or a fixed base provided on the leg device, and the backrest or the seat or both are rotatably connected to the support frame directly or via an intermediate member. ,
A chair capable of nesting according to any one of claims 1 to 3. The support frame rises upward on the left and right outer sides of the seat, and the backrest and the seat are rotatably connected to a position higher than the seat surface of the support frame directly or via an intermediate member. Yes,
A nestable chair according to claim 3. Interlocking means for advancing the seat by tilting the backrest is provided;
A nestable chair according to any one of claims 1 to 5. The support frame has a back column that rises upward behind the seat, and an upper and lower halfway height position of the backrest is connected to an upper end portion of the back column, and the seat rotates around the backrest. Connected to a position lower than the moving fulcrum,
A nestable chair according to claim 1.
A nestable chair according to any one of claims 1 to 6. A leg device capable of fitting a plurality of members in a horizontal direction; a backrest attached to the leg device directly or via a support member; and a seat attached to the leg device directly or via a support member. And is configured to be capable of nesting in the horizontal direction by flipping the seat up and turning,
A back frame to which the backrest is attached as the support member is connected to the leg device or a fixed base provided on the leg device so as to be able to tilt backward, and the seat is connected to the back frame so as to be able to rotate up and rotate. ,
Nestable chair. A leg device capable of fitting a plurality of members in a horizontal direction; a backrest attached to the leg device directly or via a support member; and a seat attached to the leg device directly or via a support member. And is configured to be capable of nesting in the horizontal direction by flipping the seat up and turning,
A back frame to which the backrest is attached as the support member is connected to the leg device or a fixed base provided on the leg device so as to be able to tilt backward, and the leg is connected via a link so that the seat can be flipped upward. Connected to the device or fixed base,
Nestable chair.

Images