JP2022179634A - Nesting chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nesting-capable chair, the seat body of which is erected by making use of a spring force of a torsion spring, and which comprises the torsion spring constituted without using a lock mechanism to maintain a laid attitude of the seated body and without making a seated person maintain the laid attitude.

SOLUTION: A torsion spring 8 of a nesting-capable chair has its resilience adjusted so that a seat body 1 midway between an erection angle in disuse of the seat body 1 including a seat retaining cover 2 and a laying angle in use can be almost balanced with a load acting on the torsion spring 8.

SELECTED DRAWING: Figure 7

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention utilizes the repulsive force (hereinafter also referred to as spring force) of a torsion spring to move a seat body comprising a seat surface and a backrest from a sitting posture (posture during use) substantially parallel to the floor to a standing posture (posture during use). The present invention relates to a chair provided with torsion springs that can be stacked (hereinafter also referred to as nesting) in the front-rear direction on the floor by changing its posture to a posture when not in use.

Conventionally, when not in use, stacking in the vertical direction or stacking in the front and back direction (nesting) reduces the occupied area when not in use and increases space efficiency when storing. There is a chair in the back.

As for nesting chairs, Patent Documents 1 to 3 and the like disclose a chair equipped with a torsion spring for raising a seat body using a spring force.

As for the use of a torsion spring in a known chair, in a chair in which the seat is erected only by the force of the spring, the seat is held in a lying down position substantially parallel to the floor when in use, so a locking mechanism for the seat in the lying down position is required. was essential. Some known chairs hold the seat body in a recumbent posture when the user is seated.

Japanese Patent No. 3321727 Japanese Utility Model Publication No. 64-128 Japanese Patent No. 6527623

The present invention is a chair in which a seat body is erected by utilizing the spring force of a torsion spring, in which a locking mechanism is not used to hold the seat body in a lying posture, and a seated person is not required to hold the lying posture. The subject is a nesting chair with a torsion spring.

The configuration of the chair equipped with the torsion spring of the present invention, which is intended to solve the above problems, is as follows:
A seat support cover having a seat body having a seat surface and a backrest on its upper surface, and the seat support cover being rotatable between a lying position substantially parallel to the floor and a standing position at a desired angle via a torsion spring and a support shaft. A chair provided with a torsion spring comprising a connected bracket and a leg portion including a lateral member provided with a support portion for supporting the receiving seat cover in a lying down position with the bracket, wherein the torsion spring exerts its repulsive force. The seat body including the seat support cover acts on the torsion spring at a position (hereinafter referred to as an intermediate position) including the middle between the standing angle when not in use and the falling angle when in use. It is characterized in that it is adjusted so as to be substantially balanced with the load applied.

The seat body including the seat support cover stands up when the seat body is pushed in the standing direction at an angle substantially halfway between the standing angle and the falling angle, and when pushed in the falling direction, the torsion spring is activated. Since the seat body collapses by its own weight, which overcomes the repulsive force, it moves gently without impact at the end of standing and falling.

In the above chair, the seat support cover has an insertion hole in the front end of the upper surface of the substantially dish-shaped body for receiving the front end side of the bracket, and the bracket erected on the side of the insertion hole acts on the seat support cover to raise the seat support cover. and a stopper wall provided with a shaft hole to prevent the rotation of the direction at the standing angle set in the seat body, and a bracket to be inserted into the insertion hole has a bearing coaxially with the shaft hole of the stopper wall at the tip portion thereof. The seat support cover and the bracket are connected by passing a support shaft for supporting the torsion spring through the shaft hole and the bearing, and when the seat support cover rotates from the collapsed posture to the upright side, the stopper wall A rotation restricting mechanism abuts against the bracket to prevent the upright rotation of the seat support cover at the upright angle set on the seat body.

The seat support cover and the support part are arranged such that the seat support cover or the support part with which the seat support cover abuts is provided with a contact holding member, and the seat support part including the seat support cover is provided with a contact holding member at the end of the falling rotation of the seat body including the seat support cover. The contact holding member can compensate for the maintenance of the state in which the receiving cover is in contact with the support portion.

In the present invention, the support portion may be made of steel, and the seat support cover may have a magnet as a contact holding member at a portion that contacts the support portion. The magnet is provided on the seat support cover in a non-contact state with the support portion, so that a metallic sound is generated when the magnet is in contact with the support portion, and the coating film is not damaged by the magnet hitting the support portion.

Since the rotation restricting mechanism is formed by the structure of the seat support cover itself and the bracket itself, which are connected to each other, it does not require separate dedicated parts. Therefore, the structure of the rotation restricting mechanism is simple, easy to assemble, and less prone to failure. In addition, the leg frame of the above chair may have a form in which two leg frames having different left and right widths when viewed from the front are joined at the lateral member so as to present a substantially inverted V shape when viewed from the side.

The seat support cover and the bracket include the stopper wall or the seat support member with which the stopper wall abuts, and the contact support member with the seat support cover or the support portion with which the seat support cover abuts. The contact holding member can maintain a state in which the seat support cover abuts against the support portion at the end of the tilting rotation of the seat body including the seat support cover.

Further, the state where the stopper wall of the receiving seat cover abuts against the bracket at the end of the upright rotation of the seat body can be controlled by providing the bracket with a click member that resiliently engages with the seat receiving cover. The member is elastically engaged with the seat support cover so that the end of the seat support cover can be felt with a click feeling and held in the end position.

The brackets are installed on the joined horizontal members, and are installed at two locations near the center of the horizontal members, where both ends of the support shaft that supports the torsion spring correspond to each other. As a result, the connecting portion with the seat support cover is positioned substantially at the center of the lateral member. Further, the bracket is formed of a tubular body having two standing walls spaced apart from each other at the tip portion thereof, and the two standing walls are provided with bearings for the support shaft. The tubular body of the bracket functions as a restricting wall for the stopper wall whose upper wall rises and rotates.

The support walls provided in the seat support cover stand on the left and right sides of the bracket insertion hole provided in the seat support cover, and are positioned to sandwich the tip of the bracket that is inserted into the insertion hole from below. The stopper wall of the seat support cover is provided at a position sandwiched between the two standing walls at the tip of the bracket.

Since the support shaft inserted into the coil portion of the torsion spring penetrates through the shaft holes of the support wall and the stopper wall provided in the seat support cover and the bearing of the bracket, the seat is highly stable. Installed on the receiving cover. One end of the torsion spring is detachably fixed to the fixing system of the leg including the bracket, and the other end is detachably fixed to the movable system of the seat support cover. The spring force (repulsive force) of the torsion spring can adjust the spring force (repulsive force) acting on the seat body by changing the fixing position of the fixing system around the support shaft. Since the support shaft of the torsion spring is supported by a plurality of sets of shaft holes and bearings, the connection between the support shaft of the seat support cover and the bracket and the torsion spring is high in strength and stability.

According to the present invention, the spring force of the torsion spring acts on the torsion spring at an intermediate position (intermediate position between the standing angle and the lying angle) between the standing posture (standing angle) and the lying posture (loosening angle). Since the seat body is adjusted to be balanced, the load against the spring force of the seat body 1, which changes its posture as it stands up, gradually decreases from the intermediate posture toward the end of the standing posture. On the other hand, from the intermediate position where the spring force and the load of the seat body are balanced to the collapsed end, the load against the spring force gradually increases as the seat body falls horizontally. As a result, the seat body reaches the final collapsed state by its own weight while receiving the cushioning action of the spring force. In the present invention, the spring force is adjusted so that the load of the seat body and the spring force of the torsion spring are balanced in the middle of the undulating range of the seat body. Perform gentle ups and downs while being supported.

1 is a perspective view of an example of a nestable chair of the present invention; FIG. 2 is a front view of the chair of FIG. 1; FIG. FIG. 2 is a rear view of the chair of FIG. 1; Fig. 2 is a right side view of the chair of Fig. 1; FIG. 2 is a bottom view of the chair of FIG. 1; Fig. 6 is a right side view of the chair shown in Figs. 1 to 5 with the seat body upright; The side view which shows the relationship between the support part of a seat support cover at the time of nesting, and a buffer member. Sectional drawing which expanded the A section of FIG. FIG. 6 is an enlarged plan view of the chair shown in FIGS. 1 to 5 with the seat body removed to show the seat support cover; FIG. 10 is a bottom view of the seat support cover of FIG. 9; FIG. 2 is an enlarged perspective view of the seat support cover with the seat body removed; FIG. 12 is an exploded perspective view of the seat support cover of FIG. 11; FIG. 4 is an enlarged side view schematically showing the relationship between the stopper wall and the bracket of the connection mechanism between the seat support cover and the bracket;

Next, the embodiment side of the chair of the present invention will be described with reference to the drawings.
In the figure, reference numeral 1 denotes a seat body comprising a seat surface 1a and a backrest 1b. The structure of the seat body 1 is not limited to the example shown in the figure, and may be of other forms as long as the seat surface 1a and the backrest 1b are integrated.

Reference numeral 2 denotes a seat support cover formed of a shallow dish-shaped body having a substantially dish-like shape on which the seat body 1 is detachably mounted. The seat support cover 2 is provided with two substantially rectangular insertion holes 2a near the center of the front end, as shown in FIG. 7 in plan view and in FIG. ing. The upper surface of the seat receiving cover 2 is provided with two support walls 2b sandwiching the respective insertion holes 2a from the left and right, and two stopper walls 2c sandwiched between the two support walls 2b. . The support wall 2b and the stopper wall 2c are formed integrally with the seat support cover 2. As shown in FIG. The support wall 2b and the stopper wall 2c are provided with a shaft hole Sh through which a support shaft 7 described later passes. Denoted at 2e are mounting portions such as bolt holes for passing the seat body 1 or a seat surface (not shown) separate from the backrest, which are provided at four locations near the outer circumference of the seat support cover. When the seat body 1 of the chair is removed and the rotation mechanism inside the seat support cover 2 is maintained, the seat support cover 2 must be held in the laid-down position because it is necessary to use the bolt holes 2e. Therefore, two jig holes 2f are provided in the front portion of the seat surface cover 2 in order to hold the seat support cover 2 in the laid down posture. When a pin-shaped jig member (not shown) is inserted into this jig hole 2f, even if the seat surface cover 2 tries to stand up, the jig member hits a cushioning member 9 provided on the lateral member 4b, which will be described later, and the seat support cover 2 does not move. Since the upright rotation of the seat cover 2 is prevented, the maintenance work can be performed while the seat cover 2 is held in a substantially horizontal posture.

With the above structure of the seat support cover 2 and the bracket 3, the member that constitutes the connecting portion between the seat support cover 2 and the bracket 3 that raises and lowers the seat body 1 is the space formed by the upper surface of the seat support cover 2 and the lower surface of the seat body 1. Everything is contained inside, and the connecting mechanism and the rotation restricting mechanism are not exposed to the outside.

Reference numerals 4 and 5 denote two leg frames having a substantially gate shape in a front view and having horizontal members 4a and 5a substantially parallel to the floor on the left and right vertical members 4b and 5b. The lateral width of the left and right vertical members 4b when viewed from the front is formed to be larger than the lateral width of the left and right vertical members 5b of the leg frame 5 on the far side (rear). The two leg frames 4 and 5 are integrated so that their lateral members 4a and 5a overlap in the front-rear direction to form legs.

The longitudinal members 4b, 5b of the combined front and rear leg frames 4, 5 are formed in a substantially inverted V shape when viewed from the side. With this configuration, when the chair of the present invention in use is viewed from the standpoint of a person standing, only the front and rear leg frames 4 and 5 appear to extend obliquely downward from one point on the lower surface of the seat support cover 2. This becomes a design feature.

Two brackets 3, 3 protrude in a parallel posture toward the front of the seat cover 2 near the central portion of the integrated horizontal members 4a, 5a of the leg frames 4, 5, and A substantially U-shaped support portion 6 in plan view is provided in the opposite direction to the bracket 3 . The support portion 6 is a member that supports the seat body 1 in its lying posture from below. The lateral members 4a and 5a are provided with cushioning members 9 which abut on the support portion 6 of the front chair during nesting. Instead of the horizontal members 4a and 5a, the buffer member 9 can be installed at the central portion of the support portion 6 or the lower surface of the seat support cover 2 (not shown). When the cushioning member 9 is provided on the support portion 6 or the lower surface of the seat cover 2, it cushions the tip of the nested rear chair. The cushioning member 9 of the seat support cover 2 is integrally molded when the seat support cover 2 is a resin molded product. Casters 4c and 5c are provided at the lower ends of the leg frames 4 and 5, respectively.

The seat support cover 2 and the bracket 3 have coaxial shaft holes Sh in the support wall 2b and the stopper wall 2c integrally formed on the seat support cover 2, and two insertion holes for the seat support cover 2. The left and right brackets 3 exposed from 2a to the upper surface side of the seat support cover 2 have bearings Sb coaxially with the shaft hole Sh. When the support shaft 7 is arranged through the shaft hole Sh and the bearing Sb, the seat support cover 2 and the bracket 3 are rotatably connected.

Since the support shaft 7 is inserted into the coil portion of the torsion spring 8 , the torsion spring 8 is arranged at the front end portion of the seat support cover 2 together with the support shaft 7 . The arranged torsion spring 8 has one end 8a fixed to the movable system by the seat support cover 2 and the other end 8b fixed to the fixed system of the leg frames 4 and 5 including the bracket 3. As shown in FIG. 81 a is a fixing member for fixing the one end 8 a to the seat support cover 2 . Since the fixing member 81a is attached by a screw 81b by pressing one end 8a of the torsion spring 8 against the lower surface of the seat support cover 2, it is practically impossible for one person to hold down the fixing member 81a and tighten the screw 81b. It is possible. However, if the front end side of the fixing member 81a is hooked to a locking portion (not shown) provided on the seat cover 2 so that it can be supported, the front end side of the fixing member 81a can be hooked to the locking portion and one side of the fixing member 81a can be supported. Since the fixing member 81a can be pressed down with one hand and the screw 81b can be tightened with the other hand, assembly becomes easier. The torsion spring 8 urges the bracket 3 and the seat support cover 2, which are rotatably connected by the support shaft 7, to the side where the seat support cover 2 is erected.

In the present invention, the standing angle of the seat body 1 is set, for example, in the range of 60 degrees to 30 degrees, preferably in the range of 45 degrees to 35 degrees. In this setting, the repulsive force (spring force) of the torsion spring 8 is such that the seat body 1 at an intermediate position between the recline angle and the standing angle of the seat body 1 is substantially balanced with the load acting on the torsion spring 8. adjusting. When the spring force is substantially balanced with the load at the substantially midpoint of the seat body 1, the spring force of the torsion spring 8 is applied to the torsion spring 8 when the seat body 1 is in a lying posture (substantially parallel to the floor). Since it becomes smaller than the load of the seat body 1 acting on it (the balance between the load of the seat body 1 rotating to the lofting side and the spring force is lost), the seat body 1 rotates to the lofting side by its own weight and reaches the terminal end of the lofting position. It can maintain the lying posture without requiring a mechanism.

In the present invention, the load of the seat body 1 acting on the torsion spring 8 and the repulsive force of the torsion spring 8 are balanced at an intermediate position angle between the standing angle and the lying angle of the seat body 1 . Therefore, the load against the spring force is gradually reduced during the standing motion from the intermediate position to the end of the standing position, and the seat body 1 gently stands. The standing end can be detected by contacting the upper surface 22c of the stopper wall 2c provided on the seat support cover 2 with the upper wall 3a of the inner surface of the bracket 3, and is held at that position by spring force. On the other hand, when the seat body 1 falls down, the load against the spring force of the seat body 1 after the intermediate position gradually increases, so the seat body 1 gently falls down. The terminal position of the lodging can be recognized by the contact portion 21 provided on the lower surface 2d of the seat support cover 2 coming into contact with the upper surface 6a of the support portion 6 provided on the leg frames 4 and 5. is held in

In the chair of the present invention, the spring force of the torsion spring 8 acts on the torsion spring 8 at an intermediate position (an angle at an intermediate position between the standing angle and the lying angle) between the standing posture (standing angle) and the lying posture (falling angle). It is adjusted to balance the load of the seat 1. As a result, from the intermediate posture toward the standing terminal end, the load against the spring force of the seat body 1, which changes in posture as it stands up, gradually decreases, so that the spring force reaches the standing terminal end. . On the other hand, from the intermediate position where the spring force and the load of the seat support 1 are balanced toward the collapsed end, the seat body 1 falls horizontally and the load against the spring force gradually increases. It reaches the lodging end by its own weight while receiving the force buffering action. In this way, the seat body 1 is gently raised and lowered because the spring force is adjusted so as to be balanced with the load of the seat body at the intermediate position of the raising and lowering range.

The upright end of the seat body 1 that rises gently as described above can be known by the contact between the stopper wall 2c and the bracket 3 (the upper surface 22c of the stopper wall 2c contacts the upper wall 3a of the bracket 3). As an example, as schematically shown in FIG. 11, if a click member 3b having a convex portion 33b elastically engaged with the seat support cover 2 in the upright end position is arranged on the bracket 3, the convex portion Since 33b is elastically engaged with the seat support cover 2 at the upright end of the seat body 1, the abutment can be perceived with a click feeling. In FIG. 11, a piece-shaped click member 3b having an elastic convex portion 33b is arranged on the bracket 3, and when the seat support cover 2 rotates toward the upright end, the dented edge 23c of the upright seat support cover 2 Since the protrusion 33b is flipped to engage with the click member 3b, this series of operations enables the user to feel the click feeling at the end of the standing position of the seat body 1 and to maintain the posture at the end of the standing position.

The bottom surface 2d of the seat support cover 2 contacts the upper surface 6a of the support portion 6, so that the seat body 1 including the seat support cover 2 can maintain the contact state by its own weight. In order to know the end of the collapsed state with a click feeling, for example, a synthetic resin abutment member having a magnet 21a as an abutment holding member is attached to the lower surface 2d of the seat support cover 2 facing the upper surface 6a of the support portion 6. A part 21 is preferably provided. Then, when the abutting portion 21 of the seat cover 2 abuts the supporting portion 6, the magnet 21a attracts the supporting portion 6, so that the falling end of the seat body 1 is clicked with a feeling of magnetic attraction. and the seat 1 can be held in that position. The magnet 21a may be provided on the surface or inside of the contact portion 21, or the contact portion 21 itself may be formed of a magnet. The magnet 21a can also be provided on the support portion 6 side. Further, a member for holding the two members 2 and 6 in contact with each other by frictional engagement force may be provided between the support portion 6 and the seat support cover 2 instead of the magnet. The magnet 21a is desirably provided in a non-contact manner on the other side to be attracted. Therefore, in the example shown in FIG. 8, the surface of the magnet 21a is exposed and embedded in the contact portion 21. As shown in FIG.

In the nesting chair of the present invention, the load of the seat on the torsion spring and the spring force of the torsion spring are balanced in the middle of the ups and downs rotation range of the seat. Since it acts as an urging force and acts as a cushioning force in the rotation from the middle to the lodging end side, the seat body can be raised and lowered gently.

1 seat body
2 Seat support cover 3 Brackets 4, 5 Leg frame 6 Support part 7 Support shaft 8 Torsion spring 9 Buffer member

The present invention provides a substantially bowl-shaped seat body or a substantially recessed cup-shaped seat body (hereinafter referred to as a shell-shaped seat body) in which a seat surface, a backrest, and a side wall are integrally molded, and the repulsive force of a spring (hereinafter referred to as a spring repulsion force). It is also called a spring force.) to change the posture from the sitting posture (posture when in use) where the seat surface is almost parallel to the floor to the standing posture (posture when not in use), and stack them on the floor in the front and back direction. The present invention relates to a nesting chair provided with a shell-shaped seat body that can be (hereinafter also referred to as nesting).

Conventionally, when not in use, stacking in the vertical direction or stacking in the front and back direction (nesting) reduces the occupied area when not in use and increases space efficiency when storing. There is a chair in the back.

As for nesting chairs, Patent Documents 1 to 3 and the like disclose a chair equipped with a torsion spring for raising a seat body using a spring force.

Most of the seat bodies of known nesting chairs have a seat surface and a backrest that are substantially L-shaped when viewed from the side. I don't see any nesting chairs that allow them to be in a standing position when in use.

Japanese Patent No. 6527623 Japanese Patent No. 3321727 Japanese Utility Model Publication No. 64-128

It is an object of the present invention to provide a nesting chair in which the seat body is erected by utilizing spring force, and which has a seat body formed like a shell with a seat surface, a backrest and a side wall so that the seat body can be laid down and raised freely. .

The nesting chair of the present invention, which has been made for the purpose of solving the above-mentioned problems, is composed of a seat support having a seat body having a seat surface and a backrest on the upper surface thereof, and the seat support being substantially parallel to the floor via a support shaft. A nesting chair in which the seat body is rotatably connected to the legs between a lying posture and a standing posture at a desired angle, wherein the seat body comprises a seat surface and a backrest, and right and left sides of the seat surface and the backrest. It is characterized by a shell-shaped seat body in which left and right side walls connecting side edges are integrally molded in a shell shape . In this specification, the seat support is hereinafter referred to as a seat support cover.

In the nesting chair of the present invention, the seat body is a shell-shaped seat body in which the seat surface, the backrest, and the left and right side walls connecting the seat surface and the backrest are integrally molded in a shell shape. The side edge of the seat) can be used as an elbow rest or as a support for the hand when the seated person stands up or sits down. In addition, the side walls of the shell-shaped seat body can shield the body of the seated person from the outside line of sight.

The shell-shaped seat body integral with the seat support cover stands up when the seat body is pushed in the standing direction by the action of the torsion spring at an angle substantially halfway between the standing angle and the reclined angle, When pushed in the falling direction, the weight of the seat body overcomes the repulsive force of the torsion spring and falls down, so that the standing end and the falling end are gently moved without impact.

In the chair of the present invention, the seat support cover has an insertion hole in the front end of the upper surface of the substantially dish-shaped body for receiving the front end side of the bracket, and the bracket erected on the side of the insertion hole acts on the seat support cover. A stopper wall provided with a shaft hole prevents rotation in the rising direction at the rising angle set in the shell-shaped seat body, and a bracket to be inserted into the insertion hole is coaxially aligned with the shaft hole of the stopper wall at a tip portion thereof. and the seat support cover and the bracket have a connection structure in which a support shaft that supports the torsion spring is passed through the shaft hole and the bearing, and the seat support cover rotates from the lying position to the standing side. At this time, the stopper wall abuts against the bracket to prevent the upright rotation of the seat support cover at the upright angle set on the shell-shaped seat body.

The seat support cover and the support part are provided with a contact holding member on the seat support cover or the support part with which the seat support cover abuts, so that the shell-shaped seat body including the seat support cover is at the end of the falling rotation. The contact holding member can compensate for the maintenance of the state in which the seat support cover is in contact with the support portion.

In the chair of the present invention, the support portion may be made of steel, and the seat support cover may have a magnet as a contact holding member at a portion that contacts the support portion. The magnet is provided on the seat support cover in a non-contact state with the support portion, so that a metallic sound is generated when the magnet is in contact with the support portion, and the coating film is not damaged by the magnet hitting the support portion.

Since the rotation restricting mechanism is formed by the structure of the seat support cover itself and the bracket itself, which are connected to each other, it does not require separate dedicated parts. Therefore, the structure of the rotation restricting mechanism is simple, easy to assemble, and less prone to failure. The leg frames of the chair of the present invention may have front and rear leg frames with different left and right widths when viewed from the front, and may be joined at lateral members of the front and rear leg frames so as to present a substantially inverted V shape when viewed from the side.

The seat support cover and the bracket include the stopper wall or the seat support member with which the stopper wall abuts, and the contact support member with the seat support cover or the support portion with which the seat support cover abuts. The contact holding member can maintain a state in which the seat support cover abuts against the support portion at the end of the tilting rotation of the seat body including the seat support cover.

Further, the state in which the stopper wall of the seat cover abuts the bracket at the end of the upright rotation of the shell-shaped seat body can be controlled by providing the bracket with a click member that elastically engages with the seat cover. The click member is elastically engaged with the seat support cover so that the end of the seat support cover can be perceived with a click feeling and held at the end position.

The brackets are installed on the coupled horizontal members, and are installed at two locations near the center of the horizontal members, where both ends of the support shaft that supports the torsion spring correspond to each other. As a result, the connecting portion with the seat support cover is positioned substantially at the center of the lateral member. Further, the bracket is formed of a tubular body having two standing walls spaced apart from each other at the tip portion thereof, and the two standing walls are provided with bearings for the support shaft. The tubular body of the bracket functions as a restricting wall for the stopper wall whose upper wall rises and rotates.

The support walls provided in the seat support cover stand on the left and right sides of the bracket insertion hole provided in the seat support cover, and are positioned to sandwich the tip of the bracket that is inserted into the insertion hole from below. The stopper wall of the seat support cover is provided at a position sandwiched between the two standing walls at the tip of the bracket.

Since the support shaft inserted into the coil portion of the torsion spring penetrates through the shaft holes of the support wall and the stopper wall provided in the seat support cover and the bearing of the bracket, the seat is highly stable. Installed on the receiving cover. One end of the torsion spring is detachably fixed to the fixing system of the leg including the bracket, and the other end is detachably fixed to the movable system of the seat support cover. The spring force (repulsive force) of the torsion spring can adjust the spring force (repulsive force) acting on the seat body by changing the fixing position of the fixing system around the support shaft. Since the support shaft of the torsion spring is supported by a plurality of sets of shaft holes and bearings, the connection between the support shaft of the seat support cover and the bracket and the torsion spring is high in strength and stability.

In the chair of the present invention, the spring force of the torsion spring acts on the torsion spring at an intermediate position (intermediate position between the standing angle and the lying angle) between the standing posture (standing angle) and the lying posture (falling angle). , the load against the spring force of the seat body 1, which changes its posture as it stands up, gradually decreases from the intermediate posture toward the end of the standing posture. It reaches the standing end by spring force.
On the other hand, from the intermediate position where the spring force and the load of the seat body are balanced toward the collapsed end, the load against the spring force gradually increases as the seat body tilts to the horizontal side. It reaches the lodging end by its own weight while receiving the force buffering action.
In the chair of the present invention, the spring force of the torsion spring is adjusted so that the load of the seat body and the spring force of the torsion spring are balanced in the middle of the undulating range of the seat body. It makes a gentle ups and downs motion supported by.

In the nesting chair of the present invention, the seat body is a shell-shaped seat body in which the seat surface, the backrest, and the left and right side surfaces connecting the seat surface and the backrest are integrally molded in a shell shape. The side wall edge of the seat body) can be used as an elbow rest or as a support for the hand when the occupant stands up or sits down. In addition, the walls on the side of the shell can block the body of the seated person from outside sight lines.

1 is a perspective view of an example of a nesting chair of the present invention; FIG. 2 is a front view of the chair of FIG. 1; FIG. Figure 2 is a rear view of the chair of Figure 1; Fig. 2 is a right side view of the chair of Fig. 1; Figure 2 is a bottom view of the chair of Figure 1; FIG. 6 is a right side view of the chair shown in FIGS. 1 to 5 with the seat upright. The side view which shows the relationship between the support part of a seat support cover at the time of nesting, and a buffer member. Sectional drawing which expanded the A section of FIG. FIG. 6 is an enlarged plan view of the chair shown in FIGS. 1 to 5 with the seat body removed to show the seat support cover; FIG. 10 is a bottom view of the seat support cover of FIG. 9; FIG. 2 is an enlarged perspective view of the seat support cover with the seat body removed; FIG. 12 is an exploded perspective view of the seat support cover of FIG. 11; FIG. 4 is an enlarged side view schematically showing the relationship between the stopper wall and the bracket of the connection mechanism between the seat support cover and the bracket;

Next, an embodiment of the nesting chair of the present invention will be described with reference to the drawings.
In the figure, reference numeral 1 denotes a seat body comprising a seat surface 1a , a backrest 1b, and left and right side walls 1c and 1d integrally connecting the left and right side surfaces of the seat surface 1a and the backrest 1b. , the backrest 1b, and the left and right side walls 1c and 1d are integrally formed of a synthetic resin molded body to form a shell . Hereinafter, this seat body 1 will be referred to as a shell-like seat body. The configuration of the shell-shaped seat body 1 is not limited to a shell-like shape having a substantially triangular shape when viewed from the side in the drawing, as long as the seat surface 1a, the backrest 1b, and the left and right side walls 1c and 1d are integrated. Other shell-like forms may also be used. In this specification, when the sitter sits on the chair of the present invention, the front side of the sitter is forward direction, the rear side of the sitter is the rear direction, the left side of the sitter is the left direction, and the right side of the sitter is the direction. to the right.

Reference numeral 2 denotes a seat support cover which constitutes a seat support formed by a shallow dish-shaped body having a substantially dish-like shape on which the shell-shaped seat body 1 is detachably installed. 9 shows a plan view of the seat support cover 2, FIG. 10 shows a bottom view thereof, and FIGS. 9 to 12, two substantially rectangular insertion holes 2a in plan view are provided near the center of the front end portion, into which brackets 3 described later are inserted from below. The upper surface of the seat receiving cover 2 is provided with two supporting walls 2b sandwiching the respective insertion holes 2a from the left and right, and two stopper walls 2c sandwiched between the two supporting walls 2b. . The support wall 2b and the stopper wall 2c are formed integrally with the seat support cover 2. As shown in FIG. The support wall 2b and the stopper wall 2c are provided with a shaft hole Sh through which a support shaft 7 described later passes. Denoted at 2e are mounting portions such as bolt holes for passing the seat body 1 or a seat surface (not shown) separate from the backrest, which are provided at four locations near the outer circumference of the seat support cover 2 .

When removing the shell-shaped seat body 1 and performing maintenance on the rotating mechanism inside the seat support cover 2, it is necessary to use the bolt holes 2e. . Therefore, two jig holes 2f are provided in the front portion of the seat support cover 2 in order to hold the seat support cover 2 in the laid down posture (see FIG. 10). When a pin-shaped jig member (not shown) is inserted into the jig hole 2f, even if the seat support cover 2 tries to stand up, the jig member hits a cushioning member 9 provided on the lateral member 4b, which will be described later, and the seat support cover 2 does not move. upright rotation. Thereby, the maintenance work can be performed while the seat support cover 2 is held in a substantially horizontal posture.

With the above structure of the seat support cover 2 and the bracket 3, the upper surface of the seat support cover 2 and the lower surface of the seat body 1 form the member that constitutes the connecting portion between the seat support cover 2 and the bracket 3 that raises and lowers the shell-shaped seat body 1. Since everything fits in the space where it does, the connection structure and rotation control structure are not exposed to the outside.

Reference numerals 4 and 5 denote two (front and rear) leg frames that have horizontal members 4a and 5a that are substantially parallel to the floor above left and right vertical members 4b and 5b and that form a gate shape when viewed from the front. In the illustrated example, the lateral width of the left and right vertical members 4b of the leg frame 4 on the near side (front) when viewed from the front is larger than the lateral width of the left and right vertical members 5b of the leg frame 5 on the far side (rear). It is formed in the left and right width. The two leg frames 4 and 5 are integrated so that their lateral members 4a and 5a overlap in the front-rear direction to form legs. The reason why the widths of the front and rear leg frames 4 and 5 are different is to prevent the front and rear leg frames 4 and 5 from interfering with each other during nesting.

The longitudinal members 4b, 5b of the front and rear leg frames 4, 5 that are integrally united are formed in a substantially inverted V shape when viewed from the side. With this configuration, when the chair of the present invention in use is viewed from the standpoint of a person standing, only the front and rear leg frames 4 and 5 appear to extend obliquely downward from one point on the lower surface of the seat support cover 2. This is a design feature (see FIGS. 1 to 4).

Two brackets 3, 3 protrude forward in a parallel posture toward the front of the seat support cover 2 near the center of the integrated horizontal members 4a, 5a of the front and rear leg frames 4, 5. In addition, a support portion 6 having a substantially inverted U shape in a plan view is provided in a direction opposite to the projecting direction of the bracket 3 . The support portion 6 is a member that supports the lying posture of the shell-shaped seat body 1 from below. Approximately at the center of the horizontal members 4a and 5a, there is provided a cushioning member 9 which abuts on the support portion 6 of the chair in front during nesting. Instead of the horizontal members 4a and 5a, the buffer member 9 can be installed at the central portion of the support portion 6 or the lower surface of the seat support cover 2 (not shown). When the cushioning member 9 is provided on the support portion 6 or the lower surface of the seat cover 2, it cushions the tip of the nested rear chair. The cushioning member 9 of the seat support cover 2 is integrally molded when the seat support cover 2 is a resin molded product. Casters 4c and 5c are provided at the lower ends of the leg frames 4 and 5, respectively.

The seat support cover 2 and the bracket 3 have coaxial shaft holes Sh in the support wall 2b and the stopper wall 2c integrally formed on the seat support cover 2, and two insertion holes for the seat support cover 2. The left and right brackets 3 exposed from 2a on the upper surface side of the seat support cover 2 have bearings Sb coaxially with the shaft holes Sh (see FIG. 12) . When the support shaft 7 is arranged through the shaft hole Sh and the bearing Sb, the seat support cover 2 and the bracket 3 are rotatably connected.

Since the support shaft 7 is inserted into the coil portion of the torsion spring 8 , the torsion spring 8 is arranged at the front end portion of the seat support cover 2 together with the support shaft 7 . The arranged torsion spring 8 has one end 8 a fixed to the movable system by the seat support cover 2 and the other end 8 b fixed to the fixed system of the leg frames 4 and 5 including the bracket 3 . 81 a is a fixing member for fixing the one end 8 a to the seat support cover 2 . Since the fixing member 81a is attached by a screw 81b by pressing one end 8a of the torsion spring 8 against the lower surface of the seat support cover 2, it is practically impossible for one person to hold down the fixing member 81a and tighten the screw 81b. It is possible. However, if the front end side of the fixing member 81a is hooked to a locking portion (not shown) provided on the seat cover 2 so that it can be supported, the front end side of the fixing member 81a can be hooked to the locking portion and one side can be supported. Since the fixing member 81a can be pressed down with one hand and the screw 81b can be tightened with the other hand, assembly becomes easier. The torsion spring 8 urges the bracket 3 and the seat support cover 2, which are rotatably connected by the support shaft 7, to the side where the seat support cover 2 is erected.

In the present invention, the standing angle of the shell-shaped seat body 1 is set, for example, in the range of 60 degrees to 30 degrees, preferably in the range of 45 degrees to 35 degrees. In this setting, the repulsive force (spring force) of the torsion spring 8 is approximately the load applied to the torsion spring 8 by the shell-shaped seat body 1 at an intermediate position between the falling angle and the standing angle of the shell-shaped seat body 1. adjusted to balance. If the spring force is substantially balanced with the load at the substantially intermediate point of the shell-shaped seat body 1, the spring force of the torsion spring 8 will be Since the load of the shell-shaped seat body 1 acting on the torsion spring 8 is smaller than the load of the shell-shaped seat body 1 acting on the torsion spring 8 (the balance between the load of the shell-shaped seat body 1 rotating toward the lofting side and the spring force is lost), the shell-shaped seat body 1 moves toward the lofting side under its own weight. Since it rotates to the end of the lodging, the lodging posture can be maintained without requiring a locking mechanism.

In the present invention, the load of the shell-shaped seat body 1 acting on the torsion spring 8 and the repulsive force of the torsion spring 8 are balanced at an intermediate position between the upright angle and the recoil angle of the shell-shaped seat body 1 . As a result, the shell-like seat body 1 gradually rises due to the load corresponding to the spring force being gradually reduced during the standing motion from the intermediate position to the end of the standing-up position. The standing end can be detected by contacting the upper surface 22c of the stopper wall 2c provided on the seat support cover 2 with the upper wall 3a of the inner surface of the bracket 3, and is held at that position by spring force.
On the other hand, when the shell-shaped seat body 1 falls down, the load against the spring force of the seat body 1 after the intermediate position gradually increases, so the shell-shaped seat body 1 gently falls down. The terminal position of the lodging can be recognized by the contact portion 21 provided on the lower surface 2d of the seat support cover 2 coming into contact with the upper surface 6a of the support portion 6 provided on the leg frames 4 and 5. is held by its own weight.

In the chair of the present invention, the spring force of the torsion spring 8 acts on the torsion spring 8 at an intermediate position (angle at an intermediate position between the standing angle and the lying angle) between the standing posture (standing angle) and the lying posture (loosening angle). It is adjusted to balance the load of the seat 1. As a result, the load against the spring force of the shell-shaped seat body 1, whose posture changes as the shell-shaped seat body 1 is raised, gradually decreases from the intermediate posture toward the standing end side, so that the shell-shaped seat body 1 stands up by the spring force. reach the end. On the other hand, from the intermediate position where the spring force and the load of the seat support 1 are balanced toward the collapsed end, the shell-shaped seat body 1 falls horizontally and the load against the spring force gradually increases. 1 reaches the lodging end by its own weight while receiving the cushioning action of the spring force. In this manner, the shell-shaped seat body 1 is gently raised and lowered because the spring force is adjusted so as to balance the load of the seat body at the intermediate position of the raising and lowering range.

The upright end of the shell-shaped seat body 1 that rises gently as described above can be known from the contact between the stopper wall 2c and the bracket 3 (the upper surface 22c of the stopper wall 2c contacts the upper wall 3a of the bracket 3). . As an example, as schematically shown in FIG. 13, if a click member 3b having a convex portion 33b that elastically engages with the seat support cover 2 in the upright end posture is arranged on the bracket 3, the convex portion 33b elastically engages the upright end of the shell-shaped seat body 1 with the seat support cover 2, so that the abutment can be perceived with a click feeling. In FIG. 13, a piece-shaped click member 3b having an elastic convex portion 33b is arranged on the bracket 3, and when the seat support cover 2 rotates toward the upright end, the dented edge 23c of the upright seat support cover 2 Since the projecting portion 33b is flipped and engaged with the click member 3b, this series of operations allows the shell-shaped seat body 1 to be felt with a click feeling at the end of the standing position and to maintain the posture at the end of the standing position.

The lower surface 2d of the seat support cover 2 contacts the upper surface 6a of the support portion 6, so that the seat cover 2 and the shell-like seat cover 2 can be brought into contact with each other by their own weight. can hold In order to know the end of the collapsed state with a click feeling, for example, a synthetic resin abutment member having a magnet 21a as an abutment holding member is attached to the lower surface 2d of the seat support cover 2 facing the upper surface 6a of the support portion 6. A part 21 is preferably provided. Then, when the abutting portion 21 of the seat support cover 2 abuts the supporting portion 6 at the falling end of the shell-shaped seat body 1, the magnet 21a attracts the supporting portion 6, so that the falling end is clicked with a feeling of magnetic attraction. , and the shell-like seat body 1 can be held at that position. The magnet 21a may be provided on the surface or inside of the contact portion 21, or the contact portion 21 itself may be formed of a magnet. The magnet 21a can also be provided on the support portion 6 side. Further, a member for holding the two members 2 and 6 in contact with each other by frictional engagement force may be provided between the support portion 6 and the seat support cover 2 instead of the magnet. The magnet 21a is desirably provided in a non-contact manner on the other side to be attracted. Therefore, in the example shown in FIG. 8, the surface of the magnet 21a is exposed and embedded in the contact portion 21. As shown in FIG.

In the nesting chair of the present invention, the seat body is a shell-shaped seat body in which the seat surface, the backrest, and the left and right side walls connecting the seat surface and the backrest are integrally molded in a shell shape. The side wall edge of the seat body) can be used as an elbow rest or as a support for the hand when the occupant stands up or sits down. In addition, the side walls of the shell-shaped seat body can shield the body of the seated person from the outside line of sight.

1 shell-shaped seat body
2 Seat support cover (seat support)
3 brackets 4, 5 leg frame 6 support part 7 support shaft 8 torsion spring 9 buffer member

Claims (5)

A seat support cover having a seat body having a seat surface and a backrest on its upper surface, and the seat support cover being rotatable between a lying position substantially parallel to the floor and a standing position at a desired angle via a torsion spring and a support shaft. A nestable chair comprising an articulated bracket and a leg portion including a lateral member provided with a support portion for supporting said bracket and said seat cover in a recumbent position, said chair comprising:
The repulsive force of the torsion spring is substantially balanced with the load applied to the torsion spring by the seat body at an intermediate position between the standing angle when the seat body including the seat support cover is not in use and the tilting angle when in use. A chair, characterized in that it is a torsion spring adjusted to The seat body including the seat support cover stands up when pushed in the standing direction with a hand on the seat body in the middle between the standing angle and the falling angle, and overcomes the repulsive force of the torsion spring when pushed in the falling direction. 2. The chair according to claim 1, wherein the repulsive force of said torsion spring is adjusted so that said seat body collapses under its own weight. The seat support cover and the support part are arranged such that the seat support cover or the support part with which the seat support cover abuts is provided with a contact holding member, and the seat support part including the seat support cover is provided with a contact holding member at the end of the tilting rotation of the seat body including the seat support cover. 3. The chair according to claim 1, wherein the contact holding member maintains the state in which the receiving cover is in contact with the support portion. 4. The chair according to any one of claims 1 to 3, wherein said support portion is made of a material having magnetism, and said seat support cover has a magnet as said contact holding member at a portion that contacts said support portion. 5. The chair according to claim 4, wherein said magnet is provided on said seat support cover in a non-contact state with said support.

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