JP6204652B2 - Rocking chair - Google Patents

Description

The present invention relates to a rocking chair seat in conjunction to advance the tilting after the backrest, in particular, is set to the Target nestable chair back and forth springing up the seat.

  In a swivel chair or the like, a synchro-type chair in which the seat moves forward in conjunction with the backward tilt of the backrest is widely used, and a link mechanism is often used as a mechanism for interlocking the seat with the backrest.

  On the other hand, in order to save storage space when the chair is not in use, fitting the chairs horizontally (nesting) is also 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. In addition, a space for allowing the rear half of the seat to rotate downward is vacant behind the fixed base.

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 still room for improvement in terms of improving sitting comfort.

  In other words, 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.

In this regard, it can be said that a synchro-type chair is applied and the seat moves forward by locking, but the conventional synchro mechanism uses a link mechanism, so the seat cannot be flipped up. Not applicable to nesting chairs.

  The present invention has been made in view of such a current situation, and has as its main object to provide a synchro mechanism that can be easily applied to a nestable rocking chair. The present application also discloses many improvements with respect to chairs, and providing these improved chairs can also be an object of the invention.

As described in claim 1, the chair of the present invention is as follows.
"And backrest of the rear tilting comprises a seat to move forward movement in conjunction with the tilting after the backrest, while is provided upward of the passive arm in the rear of the seat or which Toritsui loci receiving body, said back The lower end of the actuator is provided with a pushing portion that pushes the passive arm . ''
This is the basic configuration.

In the first aspect of the present invention, a plurality of leg devices that support the seat and the backrest can be fitted back and forth, and the seat moves back and forth on the leg device or a support member provided on the leg device. has been connected freely springing up the freely-mounted movable base member rotates, the movable base member upwardly splashing bring it said leg device is enabled fitted back and forth.

According to a second aspect of the present invention , in the first aspect of the present invention , the upper end of the passive arm is mounted with a resin crown member that is thicker in the lateral width than the upper end of the passive arm, while the pushing portion of the backrest is The crown member is formed in a pocket shape that fits from above, and the pushing portion covers the crown member even when the movable base body is flipped up.

A third aspect of the present invention obtained by embodying the second aspect, in the present invention, the pocket-like pressing portion has a front rib impinging from the front to the crown member, wherein the front rib crown member The forward tilt of the backrest is prevented by hitting.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the seat is attached to a seat receiving member that is movable back and forth, and the passive arm is provided on the seat receiving member.

  In the present invention, the seat moves forward in conjunction with the tilting of the backrest, so that the body can be held in a relaxed state when rocking. That is, it is possible to move the body while maintaining the seated state, and thereby it is possible to obtain a comfortable sitting comfort. And since it is a simple structure which pushes the passive arm provided in the seat or the seat receiving body with the pushing part of the backrest, the structure can be remarkably simplified compared with the conventional link mechanism, and it can also contribute to cost reduction. .

In the present invention, the passive arm is pushed by the pushing portion, and the backrest and the seat or the seat receiving member are not connected to each other via a member such as a link. It is possible to push this in a state of defeating. Therefore , the present invention can be easily applied to a nesting type chair in which a seat is attached to a flip- up type movable base body. In addition, the conventional nesting chair often has a cramped feeling to the user, but by adopting the configuration of the present invention , the nesting chair improves the freedom of movement of the body while being a nesting chair, and a comfortable feeling of use. Can be obtained.

The backrest can have a lower end portion as a pushing portion, but if the pushing portion is formed in a pocket shape as in claim 2 , an object is sandwiched between the passive arm and the pushing portion. There are advantages that can be prevented and that the strength of the pushing portion can be increased. Moreover, since the upper end of the passive arm cannot be seen, the aesthetics can be improved.

When a person is not leaning on the backrest, a forward external force may be applied to the upper end of the backrest. For example, when a person accidentally pushes the upper end of the backrest from behind with the chair in the desk. For such a case, it is necessary to provide a stopper means so that the backrest is held in a forward tilted state in a neutral state where the backrest is not locked.

However, in claim 3 of the present application, by providing the front rib of the pushing portion, the inward rib hits the crown member from the front even when an external force is applied to the backrest in the neutral state. The forward leaning of the backrest is prevented. Therefore, the forward leaning of the backrest can be prevented without providing any special forward tilt prevention means.

Although it is possible to install the passive arm on the seat, the seat is often retrofitted to the seat receiving body. Therefore, if the passive arm is provided on the seat, the assembly of the chair may become troublesome, and the passive arm and the pusher There is a possibility that the alignment with is troublesome. In this respect, when the passive arm is provided on the seat receiving body as in claim 4, the positioning of the passive arm and the pushing portion is simple, and the seat can be easily attached and detached.

It is a perspective view of the chair which concerns on 1st Embodiment, (A) is what was seen from the front, (B) is what it looked at back. (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 perspective view of the chair which concerns on 2nd Embodiment, (A) is the whole perspective view of the state which fell 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 the isolation | separation perspective view which shows the relationship between a seat and a slider, (B) is the fragmentary perspective view which looked at the rear part of the seat from the bottom, (C) is the fragmentary perspective view which looked at the rear part of the seat from the top. 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. 20A is a sectional view taken along line AA in FIG. 20B, FIG. 20B is a partially enlarged view of FIG. 20A, and FIG. 20C is a 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 3rd 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” are used to specify the direction, which is based on a state viewed from a person who normally sits on a chair. The front view direction is the direction facing the seated person.

  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.

Edaashi 6a, 6b are generally extends toward the radial direction from the central cylinder 5, from the center tube 5 has become posture inclined downward, the tip is bent in a vertical posture. Then, as clearly shown in FIG. 3B, the height of the front branch leg 6a is made lower than the height of the rear branch leg 6b, and the spread angle of the front branch leg 6a is made smaller than the spread angle of the rear branch leg 6b. By doing so, the leg apparatus 1 arrange | positioned forward and backward is accept | permitted mutually.

As an example of a support member, 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 the left and right ends of the fixed base 8 are respectively located above the seat 2. The protruding support frame 9 is fixed. The support frame 9 also constitutes an example of a support member. 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. and the front end of the second bracket 11, are connected to the upper end of the support frame 9 by the first support shaft 12. Accordingly, the backrest 3 may be post-tilted about a first support shaft 12.

As shown in FIG. 3, the lower portion than the first support shaft 12 from the rear of the left and right support frame 9, the movable base member 14 is rotatably connected to the flip-up by the second supporting rod 15, the movable The seat 2 is attached to the base body 14 so as to be movable back and forth.

As can be understood from the example FIG. 1 (A), the fixed to the rear surface of the first bracket, the upper and lower longitudinal main driving arm 16 as an example of the pressing portion is fixed and the pushing plate 17 to the lower end of the main driving arm 16 On the other hand, an upward passive arm 18 is fixed to a portion of the rear portion of the seat 2 positioned in front of the main driving arm 16, and left and right auxiliary plates 19 are fixed to the upper ends of the passive arms 18. The pusher plate 17 is set so as to hit the inserted follower pin 20 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. As will be described in detail 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, as shown in FIG. 3 (A) 4, by rotating the flip-up seat 2, is nested in a state between the leg apparatus 1 that matches fits in the front-rear direction. In the present embodiment, the main driving arm 16, the pushing plate 17, the passive arm 18, the auxiliary plate 19, and the driven pin 20 constitute interlocking means.

(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. Accordingly, the support bracket 24 becomes a support portion of the movable base body 14. 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 operation 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 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 by 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 can be integrally formed with the back plate 25.

(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 (slider) 45 is disposed inside the side wall 40 of the lower surface of the lower seat plate 34, and the movable rail 45 is connected to the front end portion and the rear end thereof. It fixes to the lower seat board 35 with the bis | screw (not shown) in several places, such as a part.

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 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 substrate 45a of a substantially vertical posture 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), the the rear end of the movable rail 45, rectangular tube-shaped passive arm 18 is fixed by welding. In order to ensure the accuracy of the alignment between the two, the movable rail 45 is provided with a protrusion 49 and the passive arm 18 is provided with an engagement hole 50 to fit them together.

Note that the passive arm 18 and the auxiliary plate 19, it is also possible to provide integrally with the movable rail 45. The driven pin 20 or a part that performs the same function as the driven pin 20 may be provided integrally with the passive arm 18. 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 passive arm 18 to the lower seat plate 35 with screws or the like.

As shown in FIG. 10, a front and rear longitudinal spring support 51 is fixed to a portion of the upper surface of the movable base body 14 near the left and right side plates 14a by means of an upwardly-opening U-shape by screwing or welding. At the rear end of the body 51, a U-shaped spring receiver 52 facing forward in a plan view is fixed 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 passive arm 18. ing.

Therefore, as shown in FIG. 9, when the backrest 3 tilts backward , the passive arm 18 is pushed via the driven pin 20, and 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 passive arm 18. The retracted position of the seat 2 is regulated by the rod 51 ′.

It is also possible to set so that the side wall 44 of the lower seat plate 35 is placed on the inner plate of the spring support 51. In addition, as described above , the movable base body 14 may be formed of aluminum or a resin, but in this case, it is preferable that an element corresponding to the spring support 51 is integrally formed with the movable base body 14. The spring support 51 can be adjusted in its front-rear position by operating a lever or a handle.

(4) 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.

Now, nesting chairs are often installed in conference halls and training venues, and in such venues, there is a tendency to reduce the distance between the chairs as much as possible. However, as in this embodiment , the tilting fulcrum of the backrest 3 is provided. If it is positioned higher than the seat surface and in front of the rear end of the seat 2, a large rocking angle can be obtained while suppressing the backward movement amount of the upper end of the backrest 3 as much as possible. Even if a chair is installed, it is possible to prevent an unpleasant feeling from the back person when rocking. This is an advantage of the present embodiment.

  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, the receding dimension of the upper end of the backrest 3 is shortened even if the rearward tilting angle is the same, so that the person's head and shoulders greatly recede behind the seat when rocking (the warp warps ), 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. It is necessary to adjust the hardness of the spring according to the weight, but if the pivot point of the backrest is set higher than the seating surface as in this embodiment, the pressing force of the entire upper body of the user is applied to the backrest. On the other hand, it does not act as a moment, and the backrest is merely rotated by the pressing force of only the upper part of the upper body while the upper body of the user is supported around the rotation fulcrum.

For this reason, even if a user's weight differs , the force which makes a backrest lean backward is not so different. Therefore, the same degree of locking resistance can be given to users having different weights without providing the hardness adjusting means of the locking spring 53. That is, the hardness of the spring 53 is in the same state as when it is automatically responsive to the weight of the user.

Also, as in the present embodiment, when connected to the support frame seat at a position higher than the seat surface, even backrest is in highback specification, to be able to align the flip-up height of the seat at the height of the backrest , Can contribute to the improvement of aesthetics in the nesting state.

If the tilting fulcrum of the backrest 3 is made higher than the seating surface, the lower end of the backrest 3 tends to move forward during rocking, so the waist (or buttocks) of the seated person may be pushed from behind, but the user during rocking Because the lower body of the body moves forward, 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.

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 connecting the upright portion 33a projecting upward from the rear end of the movable base body 14 to the support frame 9, it is possible to rotate the flip-up seat 102 to the backward inclined posture, the seat 2 in a flip-up state 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. Further, the posture correction device to change the relative posture of the seat 2 is flipped up as the fixed base 8 and the leg unit 1 to nestable state, and, by changing the leg support post in a free state when the seat 2 is Ru splashed It is preferable to provide a height aligning device for raising the seat 2 to the maximum height.

(5). Summary of the second embodiment will now be described with reference to the second embodiment in FIGS. 11 to 22. First, an outline of the chair will be described mainly with reference to FIGS. In the present embodiment, the reference numerals in the drawings are given independently from the first embodiment. Therefore, in both embodiments, the members are different even with the same reference numerals.

As shown in FIG. 11, 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 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. 11A, 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. 12 to 14, 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 a four-leg system having left and right front legs 10 and left and right rear legs 11. It has become. 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 bent, and the rear end of the upper side portion 14 is butted against a portion near the upper end of the rear foot 11 by welding. It is fixed.

The front ends of the left and right upper side portions 14 are connected by a laterally long horizontal bar 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 gently curved. As shown in FIG. 11B, a recess 4a 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 an upper support shaft 17 whose axis is horizontally horizontal is fixed to the upper end by welding . The backrest 3 is connected to the upper support shaft 17 via an 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 back 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 19 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. 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. 13, a stopper 20 is provided on the inner side surface of the back 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. 13, the movable base body 4 has a shallow box-like main body portion 21 that is rectangular in plan view, and a square arm 22 that protrudes upward while spreading outward from the rear portion of the main body portion 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. It is. Then, the boss 23, the upper and lower intermediate portion of the support frame 19, and is pivotally connected at a lower shaft 24 and the lower bushing 25 and the lower screws 26. Accordingly, the movable base body 4 can be flipped 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 by welding to the support frame 19. The head of the lower screw 26 is covered with a lower cap 28.

  As shown in FIG. 11 (C), the backrest 3 includes a backrest main body (main frame) 29 having a large opening in the front and rear, and a support body 30 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 on the upper support shaft 17 is formed at the outer end of the outward projecting portion 29a. Forming. 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 to the height of the lumbar region (especially 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. 12 to 14, 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 be movable relative to the front and rear. . Accordingly, the seat 2 moves relative to the slider 36. As shown in FIG. 14, 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.

Further, the rear end of the left and right of the slider 36, the left and right horizontally elongated support stay 40 made of metal plates are fixed by screws 41, to the left and right ends of the support stay 40, is formed bent upward passive arm 42 On the other hand, a pocket-shaped pushing portion (holder portion) 43 that fits on the passive arm 42 of the support stay 40 from above is provided at the lower end portion 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. Move forward . Na us, since the slider 36 is urged in the backward direction by a spring 37, pushing portion 43 suffices if the ability to push the passive arm 42. Therefore, the pushing portion 43 can be made to function as the pushing portion 43 by making a part of the lower portion of the backrest main body 29 thick, for example , without forming a pocket shape.

In the present embodiment, the pushing portion 43 and the passive arm 42 of the support stay 40 constitute interlocking means. The slider 36 and the support stay 42 constitute a seat receiver that can move back and forth, and the seat 2 is attached to the slider 36 and the support stay 42 (the mounting structure will be described later).

(6) Slide mechanism Next, details of each part will be described. First, the slide mechanism will be described mainly with reference to FIGS. 15 to 17 (the spring is omitted in FIG. 16). 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 Figure 16 and 17, the slider 36 is adapted to the groove type which opens downward in front and rear longitudinal, and the lower end of the right and left side plates 36a bent longitudinal flange 36b of the outward form. On the other hand, the left and right side portions of the movable base body 4, a pair of support projections 45 before and after the slider 36 covers provided, the upper end of the support projections 45, the rollers 46 disposed in the axial center to the right and left horizontally rollably It is inserted. 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. Therefore, the slider 36 is back and forth slidably retained impossible upward movement. 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 fitting the flange 36b on the front side between the front and rear guide stoppers 49 from above with the slider 36 shifted backward from a predetermined position, and then moving the slider 36 forward to move the flange 36 to the flange. The process is performed by positioning 36b below the guide stopper 49. And open a certain degree of spacing between the flange 36b and the bottom surface of the movable base body 4 of the slider 36, Therefore, the movable base member 4 is provided with reinforcing ribs 9 in proximity to the flange 36b of the slider 36.

The spring 37 and spring bearing 38, 39 back and forth has become one unit, the front spring receiving 38, more to the left and right holder pieces 50 provided on the rear surface of the supporting protrusions 45 positioned on the front side, impossible longitudinal and lateral displacement Is held in. That is, as shown in FIG. 17, the front spring receiving 38 the rear end while being sandwiched between the left and right of the holder piece 50 is in contact with the front support protrusions 45, the left and right holder pieces 50, support protrusions A notch 50a 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 50a from above. It is held so that it cannot be displaced in the left-right direction and the front-rear direction.

Moreover, as also best seen in Figure 17, the front spring bearing 38 forms a forward piece 38b which is a free end to the front end, the stopper claws 38d are provided at the front end of the forward piece 38c, the stopper pawl 38 d is fitted in the 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. 16 and 17, 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 37 are formed as one 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. 18 and 19 in addition to the previous drawings. As shown in FIGS. 15B and 15C, 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.

  As shown in FIG. 18, on the lower surface of the seat plate 6, a pair of front and rear downward restriction bodies 59 and 60 for holding 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.

Stopper pawl 60 is formed at the rear end of the rearward tongue 61 and the free end of the rear end and the rear face of the stopper pawl 60 is in the inclined surface 60a that rises therefore go back. 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. Rear engagement pawls 62 are provided at three places of the right and left intermediate portions and its left and right outer, because the rear of the seat plate 6 by the presence of the rear engaging claws 62 are held upward movement impossible from the support stay 40 The state where 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. 11 (C), 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. 18B, 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 in the right and left middle part of the rear end part of the seat plate 6, there is a risk that the aesthetics will be lost if the knot of the string is exposed in the state in which the seat 2 is flipped up.

  Therefore, for example, as shown in FIG. 18, 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 unmovable by claw means (not shown).

(8). Seat Pushing Mechanism Next, a seat pushing mechanism accompanying locking will be described mainly with reference to FIGS. As shown in FIGS. 20 and 21, the resin 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 front rib 43d is formed at the front end of the left right plate 43a, and the interval between the front ribs 43d is set to a dimension 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 front rib 43d and the middle plate 43c, and the passive arm 42 is 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 is 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. 21, in the upper half of the middle plate 43c, there is no space behind and is substantially a stepped portion.

As shown in FIG. 21, the backrest 3 about the axis 78 of the upper support shaft 17 rotates in the direction of arrow 79, by the rotation, pressing portion 43 is advanced while falling. 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. Thus for the case, the backrest 3, it is necessary to provide a stopper means for holding anteversion incapable neutral state where no locking.

However, in the present embodiment, the front rib 43d is provided at the front end of the left and right side plates 43a of the pushing portion 43, so that the front rib 43d can be operated even if an external force is applied to the backrest 3 in the neutral state. By striking against the crown member 44 from the front side, 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.

Further, as shown in FIG. 22, 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 4 is accommodated in the pocket-shaped pushing portion 43. Nevertheless, the movable base 4 can be rotated without twisting.

However, very small dimensions (for example, about 1 to 3 mm) only, it is also possible to shift the axis 80 of the crown member 44 from the movable base body 4 of the pivot axis 27 downward or forward or front downward. In this case, the movable base body 4 rotates with a twist (that is, rotates with the fulcrum exceeded), but the twist is absorbed by the elastic deformation of the backrest body 29 and the backrest 3 bounces. in a state in which up was, since the elastic restoring force of the backrest body 29 is acting to push tilted backward the backrest 3 without permission, it is effective to hold the state flipped up. As described above, the center of gravity of the seat portion 5 is located behind the rotational axis 27 of the movable base body 4 in a state where the seat portion 5 is flipped up .

It is also possible to provide the pushing portion 43 with a metal contact plate that hits the crown member 44 from behind. Further, without using a crown member, similarly to the first embodiment, it is also possible to link the passive arm 42 and the pushing portion 43 and a (side plate 43a of) a pin for the right and left horizontally (in this case, By making the pin hole provided in the passive arm 42 into a vertically long elongated hole , the movable base body 4 can be flipped up and turned.)

(9). Other Embodiments FIG. 23 shows an example applied to a swivel chair as in the first embodiment. In this example, an elevating base 97 is provided at the upper end of a leg column 96 made of a gas cylinder, left and right support frames 98 are provided on the elevating base 97, and the backrest 3 and the movable base body 4 are rotated around the support frame 98. It is connected freely. A support portion 97 a for the movable base body 4 is provided at the front end of the elevating base 97. Coupling structure between the backrest 3 and the movable base member 4 is the same as the second embodiment described above. Similarly to the first embodiment, the leg device 1 has two front and rear 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 , the chair can be nested in front and back.

(10). Others present invention can be in addition to various embodied also in the above embodiments. 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.

A backrest and a seat (movable base body), can be linked to a separate support member. In the case of a chair of a fixed leg device as in the second embodiment, a support member (support portion) protruding upward is provided on the upper side portion 14 constituting the leg device 1, and a movable base body or a backrest may be attached thereto. Is possible. It is also possible to provide the passive arm and the pushing portion only at one place on the left and right intermediate portions.

The present invention can be manufactured by embodying a chair. Therefore, it is possible for the industry to rise.

[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 15 2nd support shaft (spinning up rotation center of seat)
16 Main arm (pushing part) constituting interlocking means
DESCRIPTION OF SYMBOLS 17 Pushing plate which comprises interlocking means 18 Passive arm which comprises interlocking means 20 Follower pin which comprises interlocking means 23 Back plate 34,35 Seat plate 45 Movable rail which comprises seat receiving body 51 Fixed rail 53 Spring 55 Back frame [Second Embodiment]
DESCRIPTION OF SYMBOLS 1 Leg apparatus 2 Seat 3 Backrest 4 Movable base body 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 main body 32 Bearing part of backrest 36 Slider constituting seat receiving body 37 Spring 40 Constructing seat receiving body Support stay 42 Passive arm 43 Pushing portion 43c Middle plate 43d Front rib 44 Crown member

Claims (4)

And backrest of the rear tilting comprises a seat to move forward movement in conjunction with the tilting after the backrest, while is provided upward of the passive arm in the rear of the seat or which Toritsui loci receiving body, of said back In the lower end portion, a configuration is provided in which a pushing portion that pushes the passive arm is provided ,
A plurality of leg devices that support the seat and the backrest can be fitted back and forth, and a movable base body in which the seat is movably moved back and forth is flipped up on the leg device or a support member provided on the leg device. It is pivotably connected, and when the movable base body is flipped upward, the leg device can be fitted back and forth.
Rocking chair. On the upper end of the passive arm, a crown member made of a resin whose left and right width is thicker than the upper end of the passive arm is mounted, while the pushing portion of the backrest is formed in a pocket shape that fits on the crown member from above. Formed, and even when the movable base body is flipped up, the pushing portion covers the crown member,
The rocking chair according to claim 1. The pocket-shaped pushing portion has a front rib that hits the crown member from the front, and the front rib is prevented from tilting forward by the front rib hitting the crown member.
The rocking chair according to claim 2. The seat is attached to a seat receiving member that can move back and forth, and the passive arm is provided on the seat receiving member.
The rocking chair according to any one of claims 1 to 3 .

Images