JP6117521B2 - Nestable rocking chair - Google Patents

Description

  The present invention relates to a rocking chair capable of nesting to fit legs together back and forth and whose backrest tilts backward against spring means.

  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 against the background of such a situation, and is intended to provide a rocking chair that can be nested in a more improved state.

The present invention is as described in claim 1,
While a plurality of leg devices can be fitted back and forth,
Both the seat in conjunction with the tilting after the backrest is moved forward, the seat is pivotally flipped toward the front of the backrest, to the seat or which is attached seat receiving body, the lower end of the backrest A passive portion that is pushed forward by the pushing portion provided in the seat, and the seat moves forward in conjunction with the backward tilting of the backrest by pushing the passive portion with the pushing portion,
The pushing portion and the passive portion are held in a state where they are not separated from each other in either the state where the seat is tilted or the state where the seat is flipped up, and the center of the passive portion in a side view is flipped up. It is approximately aligned with the pivot axis.

  The backrest can be connected to the leg device directly or via a support member such as a support frame. The same applies to the seat. Which member the backrest and seat are connected to may be selected according to the basic structure of the chair. The seat is preferably attached to a rotatable movable base body.

The present invention also includes the structures of claims 2 and 3. Of these, the invention of claim 2 is the invention of claim 1,
One pushing portion of the backrest which is a pocket-like shape having a long space in a substantially vertical direction, the driven portion, the provided on the upper end of the passive arm projecting upwardly from the seat or seat receiving body press It fits in the space of the moving part so that it can move up and down, and the passive part is held in the pushing part so as not to move back and forth.

The invention of claim 3 is the invention of claim 2,
While the pushing portion is integrally formed on the backrest, the passive arm is made of a metal plate and the end face is positioned forward and backward, and the upper end of the passive arm is thicker than the plate thickness of the passive arm. By mounting a resin crown member, the crown member is formed as the passive portion, and a longitudinal groove that passes through the passive arm but not the crown member is forward and downward in the pushing portion. thereby opened, by forming the left and right sides of the longitudinal groove and the front rib, the relative movement between the pressing portion upon tilting the passive arm after the backrest are allowed.

  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 part provided in the seat or the seat receiving body with the pushing part of the backrest, the structure can be remarkably simplified as compared with the conventional link mechanism, which can contribute to cost reduction. .

  In the present invention, the seat is pushed forward by the backrest, and the backrest is not connected to the seat or the seat receiving member via a member such as a link. As a result, it is possible to obtain a comfortable seating comfort while being a nesting chair that can be overlapped on the front and back.

By the center of the passive portion is substantially coincident with the flip-up rotation axis of the seat, for the fitting relationship between the pressing portion and the passive part can be flipped up the seat while holding the seat The pushing part functions as a stopper against the back tilt of the backrest when it is flipped up, so it is possible to prevent problems such as the backrest shifting backward due to its own weight without providing special stopper means. it can.

  Forming the pushing portion in a pocket shape as in claim 2 has an advantage that an object can be prevented from being caught between the passive arm and the pushing portion, and an advantage 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. Furthermore, the assembly is easier than the connection by the pin.

  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 that holds the backrest in a neutral state where the backrest is not locked and cannot be tilted forward.

  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 tilt of the backrest when the seat is tilted down can be prevented without providing any special forward tilt prevention means.

It is a perspective view of the chair which concerns on embodiment, (A) is the whole perspective view of the state which fell down the seat, (B) is the whole perspective view in the state which flipped up the seat, (C) is a partial backrest FIG. The perspective view of the state which isolate | separated the seat, (B) is a perspective view of a seat receiving part. It is a separation perspective view in the state where a seat was omitted. It is a separation perspective view showing a locking mechanism. (A) is a partially separated perspective view of a seat part, (B) is a figure which shows the relationship between a slider and a support stay, (C) is CC sectional view taken on the line of (B). It is a partially separated perspective view which shows the support mechanism of a seat. (A) is a separated perspective view showing the relationship between the movable base body, the slider and the spring unit, (B) is a separated perspective view of the rear spring receiver and the movable base body, and (C) is a perspective view of the rear spring receiver. . (A) is a separated perspective view showing the relationship between the seat and the slider, (B) is a partial perspective view from the bottom of the rear of the seat, and (C) is a partial perspective view of the rear of the seat as seen from above. It is a bottom view which shows the relationship between a slider, a support stay, and a seat. (A) is the isolation | separation perspective view which shows a part of interlocking | linkage part, (B) is the partial front view of an interlocking | linkage part similarly. 10A is a cross-sectional view taken along line AA in FIG. 10B, FIG. 10B is a partially enlarged view of FIG. 10A, and FIG. 10C is a cross - sectional view taken along line CC 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 figure which shows the connection part of a backrest, (A) is a perspective view of an external appearance, (B) is an isolation | separation perspective view, (C) is a perspective view of the state which isolate | separated the upper cap, (D) is an isolation perspective view of the whole. is there. (A) is the plane sectional view cut by the rotation axis, (B) is the separation perspective view. It is a side view which shows the attachment procedure of a backrest. It is a figure which shows the attachment procedure of a backrest, (A) is a side view, (B) is a perspective view. (A) (B) is the isolation | separation perspective view which shows the connection structure of a movable base body, (C) is a perspective view of a lower cap. (A) is the isolation | separation perspective view which shows the connection structure of a movable base body, (B) is the plane sectional view cut | disconnected by the rotating shaft center. (A) and (C) are isolation | separation perspective views, (B) is a perspective view of a lower bush. (A) is A-A sectional view of FIG. 18, (B) is a partial sectional view of a state before as possible screwing the screws. It is a figure which shows the attachment procedure of a movable base body. It is a figure which shows the relationship between a movable base body and a stay, (A) is a top view, (B) is a front view. Was applied to the rotating chair is a perspective view of implementation forms.

(1). Outline of Chair Next, an embodiment of the present invention will be described with reference to the drawings. First, an outline of the chair will be described mainly based on FIGS. In the following description, the words “front and rear” and “left and right” are used to specify the direction, but the front and rear and left and right are 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.

  As shown in FIG. 1, 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. 1A, 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. 2 to 4, a large number of reinforcing ribs 9 are provided on the upper surface of the movable base body 4.

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

  The front ends of the left and right upper side portions 14 are connected by a laterally long horizontal hook 15. The recumbent rod 15 also has a function of supporting the seat portion 5 that has been tilted forward, and is bent gently in an upwardly convex shape in front view so that the left and right intermediate portions are raised. The rear foot 11 is in a forward leaning posture in a side view so as to be shifted toward the front as it goes upward, and is curved with a gentle curvature. As shown in FIG. 1B, a recess 4 a is formed on the lower surface of the movable base body 4 in which the left and right intermediate portions of the horizontal bar 15 are fitted.

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

  The left-right distance between the left and right hind legs 11 is larger than the left-right distance between the left and right front legs 10, so that the legs of the front and rear chairs can be fitted together (nested) with the seat 5 flipped up. It has become. For example, as clearly shown in FIG. 3, a stopper 20 is provided on the inner side surface of the rear foot 11 so that the front foot 10 of the rear 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. 3, the movable base body 4 has a shallow box-like main body 21 that is rectangular in plan view, and a square arm 22 that protrudes upward while spreading outward from the rear part of the main body 21. . The movable base body 4 is a resin molded product (may be an aluminum die-cast product), and the square arm 22 is provided integrally with the main body 21. In addition, since the main-body part 21 is box-shaped, the outer periphery is comprised with the surrounding wall.

The square arm 22 is basically a plate that is wide in the front-rear direction, but the front-rear distance decreases as it goes up, and a boss portion (bearing portion) 23 that protrudes outward in the left-right direction is integrally provided at the upper end. It is. Then, the boss portion 23, the upper and lower intermediate portion of the support frame 19, are rotatably connected to the the lower supporting shaft 24 and the lower bushing 25 and the lower screws 26. Therefore, the movable base member 4, it can be rotated flipped about the axis 87 of the boss portion 23, thereby, the seat 5 is thrown up as in FIG. 1 (B) (folded ) State. The center of gravity of the seat portion 5 is located behind the axis 27 of the boss portion 23 and the lower support shaft 24 in a state where the seat portion 5 is flipped up. The lower support shaft 24 is fixed to the support frame 19 by welding. The head of the lower screw 26 is covered with a lower cap 28.

  As shown in FIG. 1 (C), the backrest 3 includes a backrest body (back frame) 29 that is largely open in the front-rear direction, and a support body (backboard) 30 that is attached to the backrest body 29 so as to cover the opening. have. Although the back cushion material 31 is stretched on the front surface of the support body 30, the support body 30 may be left exposed without providing the back cushion material 31. The backrest body 29 and the support body 30 are resin molded products.

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

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

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

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

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

  Furthermore, left and right horizontally long support stays (joint plates) 40 made of metal plates are fixed to the rear end portions of the left and right sliders 36 with screws 41, and the upward passive arms 42 are bent at the left and right ends of the support stay 40. On the other hand, a pocket-shaped pushing 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 main 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 interlocked (synchronized) with the locking of the backrest 3. Advance.

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

(2) Slide mechanism Next, details of each part will be described. First, mainly with reference to FIGS. 5-7 illustrating a slide mechanism (in FIG. 6 (B), the spring 37 by displaying only the spring receiver 39 is omitted.). As described above, the movable base body 4 is provided with a pair of left and right sliders 36 to which the seat 2 is fixed.

For example, as shown in FIGS. 6 and 7, the slider 36 has a groove shape that is open in the longitudinal direction and opens downward, and an outwardly extending front and rear flange 36 b is bent at the lower end of the left and right side plates 36 a. 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 and excellent wear resistance such as POM resin, and the slider 36 can be slid back and forth lightly and silently.

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

Therefore, the slider 36 is attached by 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 flange. 36b and is positioned below the guide stopper 49, it is performed in the procedure of. A certain amount of space is provided between the flange 36b of the slider 36 and the bottom surface of the movable base body 4. Therefore, the movable base body 4 is provided with reinforcing ribs 9 adjacent to the flange 36b of the slider 36.

The spring 37 and the front and rear spring receivers 38 and 39 are formed as one unit, and the front spring receiver 38 cannot be displaced from front to back and left and right by the left and right holder pieces 50 provided on the rear surface of the support protrusion 45 located on the front side. Is retained. That is, as shown in FIG. 7, 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 a lateral protrusion 38a that fits into the notch 51 from above. It is held so that it cannot be displaced in the left-right direction and the front-rear direction.

  Also, as clearly shown in FIG. 7, the front spring receiver 38 is formed with a forward piece 38b having a front end as a free end, and a stopper claw 38d is provided at the front end of the front piece 38c. Is inserted into a long groove 52 formed in the slider 36. The front end surface of the stopper claw 38d is in a vertical posture, and thus the retreat position of the slider 36 is restricted. Further, the rear surface of the stopper claw 38d is an inclined surface 38e that becomes lower as it goes rearward. For this reason, when the slider 36 is set shifted from the back to the front, the forward piece 38c is once bent downward and deformed. Return from and deform. Therefore, the slider 36 can be easily attached.

  On the other hand, as shown in FIGS. 6 and 7, 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.

(3) 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. 8 and 9 in addition to the previous drawings. As shown in FIGS. 5B and 5C, a rearwardly facing piece 36 d is provided at the rear end of the slider 36, and this is fixed to the support stay 40 with screws 41 and nuts (cap nuts) 58.

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

  As shown in FIG. 8, on the lower surface of the seat plate 6, a pair of front and rear downward restriction bodies 59 and 60 that hold the slider 36 from the left and right are provided. A restricting portion 59a that hits the front end face is provided. Further, the seat plate 6 is provided with a stopper claw 60 that contacts the rear end of the slider 36.

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. The rear engaging claws 62 are provided at three positions, the left and right intermediate portions and the left and right outer sides, and the rear portion of the seat plate 6 is held immovably upward from the support stay 40 by the presence of the rear engaging claws 62. The state in which the stopper claw 60 is engaged with the slider 36 is maintained.

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

  In addition, as described with reference to FIG. 1C, 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. 8B, an annular groove 63 into which a string is fitted is formed on the lower surface of the peripheral edge 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. 8, a downward 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).

(4). Seat Pushing Mechanism Next, the seat pushing mechanism accompanying locking will be described mainly with reference to FIGS. As shown in FIGS. 10 and 11, the resin-made crown member 44 is attached to the upper end of the passive arm 42 in the support stay 40 as described above. The crown member 44 has a substantially circular shape in a side view, and is provided with a downward opening groove 75 into which the upper end of the passive arm 42 is fitted.

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

  The pushing portion 43 of the backrest body 29 is formed in a pocket shape as described above, and the left and right side plates 43a, the top plate 43b connected to the upper ends of the left and right side plates, and the upper and lower sides connected to the inside of the left and right side plates 43a as a pair. And a longitudinal middle plate 43c. An inward 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 extends straight in the left-right direction in plan view. For this reason, the crown member 44 can be pushed without being twisted. Since the middle plate 43c is provided in order to stably push the crown member 44 without being twisted, the space behind the middle plate 43c may be closed. That is, instead of providing the intermediate plate 43c, a stepped portion may be formed in the backrest body 29. As shown in FIG. 11, in the upper half of the middle plate 43c, there is no space behind and is substantially a stepped portion.

  As shown in FIG. 11, the backrest 3 rotates in the direction of the arrow 79 about the shaft center 78 of the upper support shaft 17, and by this rotation, the pushing portion 43 moves forward while descending. 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 acting 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, but in this embodiment, the front rib 43d is provided at the front end of the left and right side plates 43a of the pushing portion 43. As a result, even if an external force is applied to the backrest 3 in the neutral state, the front rib is prevented from leaning forward by the front rib hitting the crown member 44 from the front. Therefore, the forward tilt of the backrest 3 can be prevented without providing any special forward tilt prevention means. This is one of the advantages of this embodiment.

  Further, as shown in FIG. 12, since the rotational axis 27 of the movable base body 4 and the axial center 80 of the crown member 44 coincide with each other, the movable base body 4 is accommodated in the pocket-shaped pushing portion 43. However, the movable base body 4 can be rotated without twisting. Further, when the movable base body 4 is lifted up, the backrest 3 loses the posture holding function. Therefore, if no special posture holding means is provided, the backrest 3 tilts backward due to its own weight, but the tilting is later pushed. 43 is prevented by hitting the crown member 44. Therefore, it is possible to prevent the backrest 3 from being tilted backward in a state where the backrest 3 is lowered without providing any special backward tilt prevention means.

  The axial center 80 of the crown member 44 can be shifted from the rotational axis 27 of the movable base body 4 by a very small dimension (for example, about 1 to 3 mm) or downward or forward or downward. In this case, the movable base body 4 rotates with a twist (that is, rotates while exceeding the fulcrum), but the twist is absorbed by the elastic deformation of the backrest main body 29 and the movable base body 4. Since the elastic restoring force of the backrest main body 29 acts so as to tilt the movable base body 4 backward and push it freely, it is effective to maintain the state where the movable base body 4 is flipped up. As described above, the center of gravity of the seat 5 is located behind the pivot axis 27 in the state where the seat 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 the crown member, it is also possible to connect the passive arm 42 and the pushing portion 43 (side plate 43a of) a pin for the right and left horizontally (in this case, was only set to the passive arm 42 pin By making the hole a vertically long and long hole , the movable base body 4 can be allowed to flip up and turn.)

(5). Backrest Connection Structure Next, the connection structure of the backrest body 29 with respect to the upper support shaft 17 will be described mainly with reference to FIGS. As shown in FIGS. 13 and 14, the upper support shaft 17 protrudes from the left and right outer sides of the support frame 19 (rear foot 11), and includes a small diameter portion 17 a protruding inward. And the bearing part 32 of the backrest main body 29 is fitted in the small diameter part 17a via the resin upper bush 82 so that rotation is possible. The upper bush 82 is made of a material having excellent strength and a small friction coefficient, such as POM resin.

  The upper bush 82 is fitted to the bearing portion 32 from the outside, but as shown in FIG. 13D, the left and right cylindrical portions 83 into which the upper bush 82 is fitted are integrated with the bearing portion 32 of the backrest main body 29. On the other hand, the upper bush 82 is integrally provided with a stopper piece 82a that fits into the notch 83a of the cylindrical portion 83 and extends rearward. The upper bush 82 is held on the bearing portion 32 of the backrest main body 29 so as not to be relatively rotatable.

  As shown in FIG. 14, the upper bush 82 has an end plate 82 b that overlaps the end surface of the small-diameter portion 17 a of the upper support shaft 17, and the middle plate 32 a of the bearing portion 32 and the upper bush 82 are The support shaft 17 is held so as not to be detached. A collar 84 with a flange is fitted to the upper screw 18, and the bearing portion 32 and the upper bush 82 are firmly fastened by holding the tip of the collar 84 at the bottom of a restriction hole provided in the upper support shaft 17. It is held in a rotatable state without any problems.

  A recess 32c for concealing the head of the upper screw 18 is formed in the bearing portion 32 of the backrest body 29 so as to open to the left and right inner sides and the front, and a sliding upper cap 33 is fitted in the recess 32c. Yes. An end cap 85 is fitted on the outer end surface of the upper support shaft 17. The upper support shaft 17 is used for mounting an armrest. The hole in which the end cap 85 is fitted is a female screw hole used for attaching an armrest.

  As clearly shown in FIG. 14, a portion of the bearing portion 32 of the backrest main body 29 where the upper bush 82 stopper piece 82 a overlaps has an inclined surface 32 b that is shifted inward to the left and right as it goes rearward. The rear end of the inclined surface 32b is located substantially directly behind the inner end surface of the upper bush 82, and the inclined portion 32b of the bearing portion 32 is behind the inclined surface 32b and has a larger arc angle than the inclined surface 32b. The part 86 is continuous.

  Further, in the upper bush 82, the base of the stopper piece 82a is slightly shifted outward from the end plate 82b. Therefore, a step 82c is formed between the end plate 82b and the stopper piece 82a. The rear part of the bearing part 32 is fitted in 82c. The upper bush 82 is fitted to the bearing portion 32 over the entire circumference at the step 82c. For this reason, a high axial support function is exhibited and the upper bushing 82 is securely and firmly fitted to the bearing portion 32.

  As described above, the pushing portion 43 of the backrest main body 29 is fitted in the crown member 44 of the support stay 40. Therefore, when assembling the chair, the backrest body 29 must be fitted into the upper support shaft 17 while the pushing portion 43 is fitted into the movable base body 4. In this respect, in this embodiment, as shown in FIGS. 15 and 16, the backrest body 29 is once inclined forward from the neutral position, and the backrest body 29 is fitted into the crown member 44, and then the crown member 44 is supported as a fulcrum. The bearing portion 32 may be fitted into the upper support shaft 17 while being raised backward.

In this assembly, the upper bush 82 is fitted into the upper support shaft 17 first. And, although the rear end of the rear bearing portion 32 of the upper bush 82 is meshed with the amount corresponding lateral dimension of the step 82c E, the backrest body 29 so that the distance of the right and left bearing portions 32 is shortened young Hidan property since deformation by pushing backwards against the inclined surface 32b at the front end of the upper bush 82, the inclined surface 32b moves back overcame upper bush 82, the as possible push the bearing unit 32 and the upper bushing 82 at the same time Fits tightly.

Thus, enabling the mounting of the backrest body 29 (the seat back 3) very simple. The backrest main body 29 is roughly determined in the left and right positions by the crown member 44. However, if the inclined portion 86 is formed behind the bearing portion 32 as in the embodiment, it is preferable because the guiding function is improved.

(6). Connection structure of movable base body Next, the connection structure of the movable base body 4 will be described mainly with reference to FIGS. As shown in FIGS. 17 to 19, an outward hole 89 and an inward hole 90 are formed in the boss portion 23 of the movable base body 4 with an intermediate wall 88 interposed therebetween, and the lower bush 25 is formed in the outward hole 89. Is fitted from the outside.

  The outward hole 89 has a substantially horseshoe shape with a circular arc when viewed from the side, and the inner end portion 25a of the lower bush 25 is fitted to the inner end portion 25a so as not to be relatively rotatable. The lower bush 25 has a downward projecting portion 25b located outside the inner end portion 25a, and a thick portion 25c located outside the downward projecting portion 25b and surrounding the lower half circumference. Both ends of the thick portion 25c are upwardly stepped surfaces.

On the other hand, the boss portion 23 of the movable base body 4 has an inverted U-shaped dome portion 23a that surrounds the lower bush 25 from the left and right sides, and the left and right side plates of the dome portion 23a are cut at a portion below the axis. By notching, a stepped portion 23b is formed overlapping the thick portion 25c of the lower bush 25 from above (the notched portion is indicated by reference numeral 23d). Accordingly, the thick portion 25c of the lower bush 25 is substantially flush with the outer periphery of the boss portion 23, and has a cylindrical shape as a whole. The inside of the lower bush 25 is basically circular, and the lower support shaft 24 is fitted into this. The dome portion 23 a protrudes outside the outer end of the outward hole 89. Accordingly , the dome portion 23a opens downward.

The lower screw 26 is screwed into the lower support shaft 24 from the inside. The lower screw 26 includes a flat washer 91 that overlaps the bottom surface of the inward hole 90, a collar 92 that has a flange that overlaps the seat surface of the lower screw 26, and Two plate-type spring washers 93 positioned between the flat washer 91 and the flange of the collar 92 are fitted. The boss portion 23 is attached to the lower support shaft 24 by screwing the lower screw 26 in a state where the disc-shaped spring washer 93 is flattened and deformed. The two plate-shaped spring washers 93 are arranged in an opposite orientation so that the recesses face each other (the recesses may be oriented in the opposite direction). The outward hole 90 is closed by a front and rear slide type lower cap 28.

Since the collar 92 is stretched against the bottom surface of the hole of the lower support shaft 24, the screwing depth of the lower screw 26 is restricted. In this state, the boss portion 23 is not completely fastened, and the disc-shaped spring washer 93 is slightly There remains room for crushing deformation. For this reason, the movable base body 4 can be rotated around the axis 27 of the lower support shaft 24. Further, since the elastic deformation force of the disc-shaped spring washer 93 acts as a resistance against the rotation of the movable base body 4, the seat portion 5 in a state of being flipped up using an inexpensive disc-shaped spring washer 93. Can be prevented from falling and turning.

  Further, the downwardly protruding portion 25b of the lower bush 25 is integrally provided with a front and rear long spring piece portion 25d, and an engaging protrusion 25e is formed at the front and rear intermediate portion of the spring piece portion 25d. Two engagement grooves 94 that selectively fit into the engagement protrusions 25e of the spring piece 25d are formed in the state where the seat part 5 is tilted and raised. The space below the spring piece portion 25d is a space. Therefore, the spring piece portion 25d is allowed to bend and deform to allow the engagement protrusion 25e to escape from the lower bush 25.

  Further, when the engagement protrusion 25e is fitted into the engagement groove 94, a clicking sound is made or the fit is found by touch. That is, when the seat portion 5 is jumped up or down to a predetermined posture, the person can obtain a click feeling. Therefore, it is possible to grasp that the predetermined posture has been reached, and it is user friendly. The engagement protrusion 25e and the engagement groove 94 are an example of a posture holding means for the seat portion 5. As the posture holding means, for example, a ball catch using an elastic body such as a spring or rubber and a ball, etc. Various methods can be adopted.

As shown in FIG. 21, the movable base body 4 is attached by fitting the boss portion 23 onto the lower support shaft from above. The lower bush 25 is fitted in the lower support shaft 24 in advance. At the time of this attachment, the lower bush 25 and the boss portion 23 are fitted in the left-right direction by the depth dimension E of the outward hole 89 as shown in FIG. 18, but the rectangular arm 22 of the movable base body 4 is fitted. to the somewhat flexural deformation, press down the movable base member 4 with a certain degree of force, the deformed escape inwardly once the boss portion 23, and at the same time return deformation as that Ki pushing boss 23 Fits into the lower bush 25.

  In this case, since the dome portion 23a of the boss portion 23 projects outward, positioning in the front-rear direction is automatically performed when the boss portion 23 is fitted into the lower bush 25. For this reason, attachment can be performed quickly and accurately. As shown in FIG. 18, a portion of the boss portion 23 below the outward hole 89 is an inclined surface 23 c that is lowered toward the inside, and a chamfered outer surface of the distal end portion of the lower bush 25 is formed. Since the inclined surface 25f is formed, the boss portion 23 is reliably guided into the lower bush 25. This is one of the advantages of this embodiment.

  As shown in FIG. 18, the rotation axis 27 of the movable base body 4 and the axis of the crown member 44 of the support stay 40 are concentric. This point has already been explained.

(7) In. Another embodiment Figure 23 shows an example of application to rotating chair. In this example, left and right support frames 19 are provided on an elevating base 97 provided at the upper end of a leg column 96 made of a gas cylinder, and the backrest 3 and the movable base body 4 are rotatably connected to the support frame 98. . The connection structure between the backrest 3 and the movable base body 4 is the same as that of the above-described embodiment. The leg device 1 has two branch legs 101 and 102 each having a different mounting position with respect to the leg tube 99. For this reason, if the seat part 5 is flipped up, it can nest back and forth.

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

It is also possible to connect the backrest and the seat (movable base body) to separate support members. In the case of the chair of the fixed leg device as in the embodiment of FIGS. 1 to 22, 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 and a backrest are provided on this. It is also possible to attach. It is also possible to provide the passive arm and the pushing portion only at one place on the left and right intermediate portions. It is also possible to connect the passive portion and the pushing portion with left and right horizontally long pins (in this case, one of the pin holes of the passive portion and the pushing portion needs to be a vertically long oblong hole). .

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

1 leg device 2 seat 3 backrest 4 movable base body
DESCRIPTION OF SYMBOLS 10 Front foot 11 Rear foot 17 Upper support shaft 19 Branch 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 constituting passive portion

Claims (3)

While a plurality of leg devices can be fitted back and forth,
Both the seat in conjunction with the tilting after the backrest is moved forward, the seat is pivotally flipped toward the front of the backrest, to the seat or which is attached seat receiving body, the lower end of the backrest A passive portion that is pushed forward by the pushing portion provided in the seat, and the seat moves forward in conjunction with the backward tilting of the backrest by pushing the passive portion with the pushing portion,
The pushing portion and the passive portion are held in a state where they are not separated from each other in either the state where the seat is tilted or the state where the seat is flipped up, and the center of the passive portion in a side view is flipped up. Approximately aligned with the pivot axis,
Nestable rocking chair. One pushing portion of the backrest which is a pocket-like shape having a long space in a substantially vertical direction, the driven portion, the provided on the upper end of the passive arm projecting upwardly from the seat or seat receiving body press It is fitted in the space of the moving part so that it can move up and down, and the passive part is held so as not to move back and forth inside the pushing part,
A nestable rocking chair according to claim 1. While the pushing portion is integrally formed on the backrest, the passive arm is made of a metal plate and the end face is positioned forward and backward, and the upper end of the passive arm is thicker than the plate thickness of the passive arm. By mounting a resin crown member, the crown member is formed as the passive portion, and a longitudinal groove that passes through the passive arm but not the crown member is forward and downward in the pushing portion. thereby opened, by forming the left and right sides of the longitudinal groove and the front rib, the relative movement between the pressing portion upon tilting the passive arm after the backrest is permitted,
A nestable rocking chair according to claim 2.

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