JP2013248148A - Nestable chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nesting chair with excellent operability and comfortableness.SOLUTION: A chair includes: a leg device, a seat 2, and a backrest 3. In the leg device 1, the height and angle of branched legs are designed to be longitudinally nestable. The backrest 3 is tilted backward around a first spindle 12 at an upper end front portion of a support frame 9. The seat 2 is connected to the lower end of the backrest 3 through a second spindle 15, and the seat 2 is moved forward when the backrest 3 is tilted backward. Since the seat is moved forward in rocking, the chair has excellent relaxing performance in spite that it is nestable. The contact surfaces of support portions 58, 59 of the seat 2 by a fixed base 8 are inclined surfaces, and the seat 2 is raised while moving forward. Therefore, the resistance to rocking is changed according to the weight of a user without adjustment of the initial elastic force of a spring means each time.

Description

  The present invention relates to a nestable chair (movable chair), and in particular, a swivel chair in which a gas cylinder is provided in a leg device and a backrest is locked.

  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.

  More specifically, first, the leg has four front and rear legs, the height of the front two branches is lower than the height of the rear two legs, and the front two branches. By making the spread angle of the legs smaller than the spread angle of the two rear legs, the leg devices arranged at the front and rear are in contact with each other.

  Next, the backrest is attached to the left and right back frames on the left and right laterally fixed base provided at the upper end of the leg column (gas cylinder), and the torsion bar built in the fixed base gives resistance to the backrest locking. doing. 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, there is room for improvement in terms of operability and sitting comfort.

  For example, since the elastic force of the torsion spring is constant, in Patent Document 1, the initial elastic force of the torsion bar is adjusted with the handle in order to adjust the magnitude of the resistance to locking. It is troublesome to rotate the handle one by one to adjust the height.

  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 to improve the current situation.

  The chair of the present invention includes a leg device capable of fitting a plurality of members in a horizontal direction, a fixed base provided at an upper end of the leg device, and the fixed base or the same so as to tilt backward against a spring means. A backrest attached to a support member provided on the seat and a seat disposed above the fixed base.

  And in invention of Claim 1, the said seat is connected to the said fixed base or the member provided in this so that it can be turned up and turned freely, and by raising the said seat so that it may overlap with the front surface of the said backrest, In addition, it is allowed to fit the leg devices arranged at the front and back, and weight-sensitive resistance applying means for applying resistance according to the weight of the user with respect to the back tilt of the backrest is provided. .

  According to a second aspect of the present invention, in the first aspect, the seat is connected to the backrest or the back frame to which the backrest is attached so as to move backward or forward in conjunction with the rearward tilt of the backrest, and the weight. As the sensitive resistance applying means, there is provided lifting means for retreating or moving forward while raising the seat. As a specific example of the invention of claim 2, in claim 3, as the lifting means, the fixed base is provided with a fixed guide portion inclined in a side view, and the seat is provided on the fixed guide portion. A movable guide portion is provided.

  The invention of claim 4 also embodies claim 2, and in this invention, the rear part of the seat is connected to the fixed base by a rear link in a forward tilted posture in side view, The portion on the front side of the rear link is detachably connected to the forward extension of the back frame to which the backrest is attached, and is lifted by a parallel link mechanism comprising the rear link and the forward extension of the back frame. Means are configured, and the seat is allowed to spring up by disengaging the forward extension of the back frame.

  In the present invention, at the time of locking, a constant resistance can be given to users having different weights without adjusting the initial elasticity of the spring means. That is, if the hardness of the spring means is constant, it gives the impression that the spring is soft when used by a heavy person, and gives the impression that the spring is hard when used by a light person. Then, the weight-sensitive resistance applying means provides resistance according to the weight of the user against the back tilt of the backrest, so that even if the initial elastic force of the spring means is not adjusted, The same degree of locking resistance can be applied.

  When the seat is moved backward or forward in conjunction with the backward tilting of the backrest as in claims 2 to 4, the chair user not only tilts the upper body backward, but the seat moves forward or backwards or tilts. Thus, the body can be held in a relaxed state when rocking. Thereby, although it is a rocking chair in which nesting is possible, the sitting comfort can be improved. In addition, the seat rises while moving backward or forward, so that the weight sensitive function is more accurately exhibited.

  If the structure of Claim 3 is employ | adopted, there exists an advantage which can implement | achieve a weight sensitive type | formula with a very simple structure. On the other hand, since the seat ascends as a whole in the configuration of claim 4, it is suitable for a person who does not like the posture change of the lower body when rocking.

(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. It is a typical side view of a 5th embodiment. It is a typical side view of a 6th embodiment.

(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 making a 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.

  Box-shaped fixed bases 8 that are horizontally long and open upward are attached to the upper ends of the leg posts 4. As examples of the support members described in the claims, A support frame 9 protruding to above the seat 2 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.

  As shown in FIG. 3, a movable base 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 mounted on the expression base 14 so as to be movable back and forth.

  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 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. The main drive arm 16, the pusher plate 17, the follower arm 18, the auxiliary plate 19, and the follower pin 20 constitute interlocking means for interlocking the movement of the seat 2 with the rearward tilt of the backrest 3.

(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 14 is stably supported by the support bracket 24. Therefore, in this embodiment, the support bracket 24 becomes the support portion described in the claims. 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, a lift 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 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 disposed on the front surface of the inwardly facing piece in the first bracket 10. Then, a left and right laterally shallow recess 28 is formed at the height position of the first bracket 10 in the front surface of the back plate 23, and a metal reinforcing plate 29 is fitted into the recess 28, and the reinforcing plate 29, the back plate 25, The first bracket 10 is fastened together with screws (not shown).

  A downward projection 30 is provided on the lower surface of the back plate 25, which is for connecting the back plate 25 to the lower plate 31 as shown by a one-dot chain line in FIG. can do. Of course, the back plate 25 may be configured not to include the downward projection 28. The back plate 25 is gently curved in a forwardly concave shape in a plan view, and is curved so that the portion provided with the recess 28 is located in the foremost side in a longitudinal side view. Therefore, the place where the recess 28 is provided is the lumbar support portion. The back plate 25 has a large number of holes, and the back surface is provided with a large number of reinforcing ribs extending vertically and horizontally, but these may be omitted.

  Parts corresponding to the first bracket 10 and the second bracket 11 can be integrally formed with the back plate 23. 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 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 14 may be a resin or aluminum molded product, and the upright portion 33a may be provided integrally with the movable base 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.

  The lower seat plate 34 is formed with a group of front and rear longitudinal center slits 38, a group of inclined intermediate slits 39 located on the left and right outer sides, and a group of front and rear longitudinal side slits 40 located on the outer sides thereof. For this reason, it can be easily extended and deformed by the body pressure of the user. In the upper seat plate 34, left and right window holes 41 are formed in order to allow a seated person's buttocks to hit the intermediate slit 39 via a cushion.

  As shown in FIG. 8A, a front wall 42, a rear wall 43, and a side wall 44 are formed on the lower surface of the lower seat plate 34 so as to generally surround a group of slits 38 to 40. A portion surrounded by 44 is a concave portion opened downward. Then, a longitudinally movable rail 45 is arranged inside the side wall 40, and the movable rail 45 is fixed to the lower seat plate 35 with screws (not shown) at a plurality of locations such as a front end portion and a rear end portion thereof. Yes.

  As shown in FIG. 9, 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 14, and the slider 46 is attached to the flange 47. It is fitted.

  The slider 46 is manufactured from a material having a high frictional resistance, and a friction plate (lining sheet) 45 ′ made of a material having a high frictional resistance is integrally provided on the inner surface of the movable rail 45, thereby moving the slider 46. Between the rail 45 and the slider 46, it sets so that the frictional resistance according to a seated person's weight may generate | occur | produce. Accordingly, in the present embodiment, the friction plate 45 'and the slider 46 constitute the weight-sensitive resistance applying means described in the claims.

  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 a portion of the upper surface of the movable base 14 in the vicinity of the left and right side plates 14 a with a U-shaped upward opening by screwing 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 through the driven pin 20, so that the seat 2 moves forward against the elasticity of the spring 53. 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 ′.

  A side wall 44 of the lower seat plate 35 is set on the inner plate of the fixed rail 51. Therefore, an excessive load does not act on the movable rail 45 or the side plate 14a of the movable base 14 (a frictional resistance imparting member is provided on the sliding surface between the side wall 44 of the lower seat plate 35 and the inner plate of the fixed rail 51). May be arranged). As described above, the movable base 14 may be a molded product of aluminum or resin. In this case, it is preferable that an element corresponding to the fixed rail 51 is integrally formed with the movable base 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. In addition, since the resistance to the forward movement of the seat increases according to the weight of the seated person, a constant rocking resistance can be eliminated for persons with different weights without adjusting the initial elastic force of the spring 53 one by one.

  Now, 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. If it is positioned higher than the surface and in front of the rear end of the seat 2, a large locking angle can be obtained while suppressing the backward movement of the upper end of the backrest 3 as much as possible. Even if the chair is installed in a narrowed state, it is possible to prevent unpleasant feelings on the back when locking. This is an advantage of the present embodiment.

  In addition, the present embodiment is provided with the movable base 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 14 is connected to the support frame 9, the seat 2 can be swung up and rotated to the rearward tilted position, so that the seat 2 in the raised state is lifted. There is also an advantage that stability can be secured.

  When the frictional resistance between the friction plate 45 ′ and the slider 46 is used as the body weight sensing means as in the present embodiment, the seat 2 moves forward in one or both of the friction plate 45 ′ and the slider 46. When a material having a remarkably small coefficient of friction is used for sliding in the direction in which the seat 2 moves backward, the seat 2 does not excessively increase the force of the spring 53. There is an advantage that can be accurately returned.

  As the body weight sensing means, it is also possible to use a damper means in which a great resistance is generated in one direction of movement but the movement in the other direction is performed lightly. Moreover, it is also possible to attach it via a guide means so that the seat 2 moves upward while moving forward with respect to the movable base 14 as in the second embodiment and the third embodiment described later.

  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.

  If the backrest 3 is connected to the support frame 9 at a position higher than the seating surface as in this embodiment, the backrest can obtain as large a rearward tilt angle as possible without greatly retreating the upper end of the backrest. In this case, it is possible to suppress the trouble to the person behind you.

  That is, when the pivot point of the backrest 3 is higher than the seating surface (preferably higher than the waist of the seated person), the lower end of the backrest 3 moves forward by tilting backward, so that the backrest 3 moves backward as a whole. Compared to the case of tilting, even if the rearward tilt angle is the same, the receding dimension of the upper end of the backrest 3 is shortened, so that the head and shoulders of the person greatly antibody behind the seat when rocking (the warp is warped). ), Thereby making it possible to effectively use the space by reducing the space between the chairs as much as possible while ensuring a comfortable and comfortable state without causing discomfort to the person behind.

  In addition, when the pivot point of the backrest 3 is below the seating surface, the load on the upper body of the seated person acts as a large moment on the backrest 3 at the time of locking. Although it is necessary to adjust the hardness of the spring 53 in accordance with the body weight, if the pivot point of the backrest 3 is set higher than the seat surface as in the present embodiment, the pressing force of the entire upper body of the user is backrest. In the state where the upper body of the user is supported around the rotation fulcrum of the backrest 3, the backrest 3 is merely rotated by the pressing force of only the upper part of the upper body. For this reason, even if a user's weight differs, the force which tilts the backrest 3 back does not differ so much. Therefore, even if the hardness adjusting means of the locking spring 53 is not provided, it is possible to give the same degree of locking resistance to users having different weights (that is, the hardness of the spring 53 depends on the weight of the user). It will be the same state as auto-sensitive.)

  In addition, when the seat is connected to the support frame at a position higher than the seat surface as in this embodiment, even if the backrest is a high-back specification, the height of the seat can be adjusted to the height of the backrest (seat Does not protrude on the backrest), and can contribute to improving the aesthetics in the nesting state.

(4). Other Embodiments Next, other embodiments will be described. First, a second embodiment shown in FIG. 11 will be described. The second embodiment embodies claim 2 and connects the upper and lower middle portions of the backrest 3 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 seat 2. The upright portion 2 a provided at the rear 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. As a spring means for locking, for example, a torsion bar may be provided at the first support shaft 12.

  The upper surface of the fixed base 8 is formed as an inclined support portion 59 that becomes lower as going backward, and a supported portion 58 that is slidably brought into surface contact with the inclined support portion 59 is provided on the lower surface of the seat 2. Thus, the seat 2 is set to rise while moving forward. Therefore, in this embodiment, the inclined support portion 59 corresponds to the fixed guide portion described in the claims, the supported portion 58 corresponds to the movable guide portion, and the support portion 59 and the supported portion 58 lift the lifting means. Is configured. Needless to say, since the force to lift the seat 2 is proportional to the weight of the user, a constant rocking resistance can be given to users with different weights.

  It is also possible to replace the seat 2 shown by the solid line in FIG. 11 with the rotary base 14 and attach the seat 2 to the rotary base 14 as shown by a one-dot chain line. Thus, by attaching the seat 2 indirectly, for example, the front-rear position of the seat 2 can be adjusted. Moreover, the seating comfort of the seat 2 can also be improved by attaching the seat 2 to the rotary base 14 in a state where the seat 2 is greatly sunk downward. Providing the seat 2 on the rotary base 14 in this way can also be applied to the embodiments shown in FIG.

  The third embodiment shown in FIG. 12 also corresponds to claims 2 and 3, and a back frame 55 as an example of a support member is connected to the rear portion of the fixed base 8 by a first support shaft 12 so as to be able to tilt backward. In the 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 is connected to the downward projecting portion 57 of the seat 2. Further, a supported portion 58 and a support portion 59 that are in contact with 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. Accordingly, the support portion 59 corresponds to the fixed guide portion recited in the claims, and the supported portion 58 corresponds to the movable guide portion recited in the claims.

  The fixed base 8 incorporates spring means (for example, a compression coil spring), 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. Therefore, the seat 2 moves backward while ascending. Similar to the second embodiment, the force to lift the seat 2 is proportional to the weight (physique) of the user, and therefore the same rocking resistance is given to persons with different weights without adjusting the stiffness of the spring means. be able to.

  The fourth embodiment shown in FIG. 13 is an embodiment corresponding to claim 4. In this embodiment, the back frame is connected at its front end to the fixed base 8 by the first support shaft 12, while being seated. 2, a downward projecting portion 60 provided at the rear portion is connected to the fixed base 8 via a rear link 61. The rear link 61 is inclined forward with respect to the vertical line so that the front is high and the back is low. A front extension 55a is provided at the front end of the back frame 55, and a bearing 63 having a downward opening in the side view provided on the lower surface of the seat 2 is mounted on the Froton pin 62 mounted between the front ends of the left and right front extensions 55a. Is inserted from above. The rear link 61 and the forward extension 55a constitute lifting means.

  The connection height position of the back frame 55 with respect to the fixed base 8 and the connection height position of the rear link 61 with respect to the fixed base 8 are set to substantially the same height. The link 61 has the same structure as the parallel link mechanism. Therefore, when the backrest 3 is tilted backward, the seat 2 moves backward (moves in parallel) while rising without changing the posture in side view. Since the force to raise the seat 2 is substantially proportional to the weight of the user, the hardness 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 the fifth embodiment shown in FIG. 14, the backrest 3 is connected to the fixed base 8 via the back frame 55, while the seat 2 is attached to the upright portion 8 b provided at the rear portion of the fixed base 8. 15 is connected so as to be able to be flipped up and pivoted, and a portion on the front side of the second support shaft 15 is supported by a support portion 24 provided on the fixed base 8. Further, the back frame 55 is provided with a forward extending portion 55a extending forward from the connection portion (rotation center) by the first support shaft 12, and the seat 2 is abutted from below at the front end of the forward extending portion 55a. An upward upright portion 55b is provided in contact therewith. The spring 53 is disposed at the position of the upward standing portion 55b.

  In this embodiment, when the backrest 3 tilts backward, the seat 2 tilts backward with the second support 15 as the center. However, since resistance to the backward tilt is proportional to the weight of the seated person, the hardness against rocking is weight sensitive. ing. The relationship between the degree of backward inclination of the backrest 3 and the degree of backward inclination of the seat 2 can be arbitrarily set by changing the front-rear position of the upward standing portion 55b. It is also possible to adjust the initial elastic force of the spring by making the support position adjustable in the longitudinal direction. It is also possible to attach the seat 2 to the pivotable base 14 so as to be slidable up and down and to set the seat so that it rises without changing the side view posture by locking.

  In the sixth embodiment shown in FIG. 15, the backrest 3 is connected to the support frame 9 so as to be able to tilt backward. When the backrest 3 is locked, the pressing rod 65 connected to the lower end of the backrest 3 moves forward to compress the spring 53. The pressing rod 65 passes through the spring 43 and extends forward. A slider 66 is fixed to the front end of the pressing rod 65, and the slider 66 is sandwiched between friction bodies 67 and 68 from above and below.

  On the other hand, the rear end of the seat 2 is connected to the support frame 9 by the second support shaft 15, and the supported portion 69 provided at a site in front of the second support shaft 15 comes into contact with the upper friction body 67 from above. ing. The upper friction body 67 is attached to the fixed base 8 so as to rotate in a side view. Since the pressing force against the upper friction body 67 is proportional to the weight of the user, the resistance to the forward movement of the slider 66 is the seated person. Proportional to body weight. Thereby, resistance to rocking can be made sensitive to body weight. It is also possible to apply the supported portion 69 of the seat 2 to this inclined surface as an inclined surface that becomes lower as the upper surface of the slider 66 is approaching. In this case, the seat also tilts backward in conjunction with the rear tilt of the backrest 3, and the movement is the same as in FIG.

(5). 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 leaf spring and a torsion torsion spring can be employed as the spring means for imparting resistance to the 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.

  When a lifting means using an inclined surface is adopted as the weight sensitive resistance applying means, it is possible to provide an inclined surface on only one of the fixed base and the seat, and the other as a contact portion such as a roller. is there. The present invention does not exclude means for adjusting the initial elastic force of the spring means. In addition to the weight-sensitive resistance imparting means, it is possible to provide a means for adjusting the initial elastic force (for ease of operation, the lever type can be changed in stages to 3 stages (for example, 3 stages). It is preferable to do this.)

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

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 15 2nd support shaft (center of seat flip-up)
45 Movable rail 51 Fixed rail 51 'Friction plate as an example of weight sensitive resistance applying means 53 Spring 55 Back frame 55a Forward extension 58 Inclined supported part (movable guide part) constituting the weight sensitive resistance applying means
59 Inclined support portion (fixed guide portion) constituting weight sensitive resistance applying means
61 Rear link constituting weight-sensitive resistance applying means

Claims (4)

A leg device capable of fitting a plurality of members in a horizontal direction, a fixed base provided at an upper end of the leg device, and a support member provided on the fixed base so as to tilt backward against a spring means. An attached backrest and a seat disposed above the fixed base;
The seat is connected to the fixed base or a member provided on the fixed base so as to be able to flip up and turn up so that the seat overlaps the front surface of the backrest. It is allowed to fit each other, and provided with weight sensitive resistance applying means for applying resistance according to the weight of the user against the back tilt of the backrest,
Nestable chair. The seat is connected to the backrest or a back tiltable frame attached to the backrest so as to move backward or forward in conjunction with the rearward tilt of the backrest, and the seat is raised as the weight-sensitive resistance applying means. Lifting means to retreat or advance while
A nestable chair according to claim 1. As the lifting means, the fixed base is provided with a fixed guide portion that is inclined in a side view, and the seat is provided with a movable guide portion that rests on the fixed guide portion.
A nestable chair according to claim 2. The rear part of the seat is connected to the fixed base by a rear link in a forward leaning posture, while a portion of the seat on the front side of the rear link is a forward extension of a back frame to which the backrest is attached. The lifting means is constituted by a parallel link mechanism comprising a rear link and a forward extension of the back frame, and the seat is engaged with the forward extension of the back frame. Bounce is allowed by releasing the combination,
A nestable chair according to claim 2.

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