JP2022026201A - Seat/backrest-integrated reclinable sofa - Google Patents

Abstract

To provide a seat/backrest-integrated sofa configured to be stably reclined including a seat part even in the seat/backrest-integrated sofa in which a relative angle of the seat part and a backrest part is immobile.SOLUTION: A seat/backrest-integrated reclinable sofa comprises: a sofa body 1 integrally including a seat part 1a and a backrest part 1b; a support base 2; a front link 11 including a front first rotational part 15f journaled to the sofa body 1 and a front second rotational part 15s journaled to the support base 2; a rear link 12 including a rear first rotational part 16f journaled to the sofa body 1 and a rear second rotational part 16s journaled to the support base 2; and a torsion coil spring 13. The front link 11 is shorter than the rear link 12. The front link 11 is inclined forward and the rear link 12 is inclined rearward.SELECTED DRAWING: Figure 2

Description

The present invention relates to a sofa with an integrated back seat in which the relative angle between the seating portion and the backrest portion is immovable, and in particular, the sofa can be tilted (reclining) according to the weight movement and the comfortable posture of the user.

A chair (a chair in a narrow sense excluding a sofa, which is a class called a chair) is basically furniture that is premised on doing some work on a desk or the like, and is lighter than a sofa. Therefore, as a reclining mechanism for a chair that responds to changes in the weight and posture of the user, it is easy to develop various structures including tilting of the seating portion (seat surface). On the other hand, the sofa is basically furniture that is supposed to sit comfortably, and the cushioning property of the seating part and the backrest part is higher than that of the chair, so the weight is heavy. Therefore, in order to accommodate the comfortable posture in which the user leans backward, the seating part is generally immovable as a reclining mechanism of the sofa, and the backrest part can be tilted back and forth relative to the seating part. There are many things that are done.

On the other hand, there is also a sofa with an integrated back seat in which the relative angle of the backrest to the seat is immovable. In the case of such a sofa with an integrated back seat, the seating portion is basically immovable, so inevitably the entire sofa including the backrest portion is immovable and does not correspond to the comfortable posture of the user. However, there is a demand for a sofa with an integrated back seat that can recline according to the weight shift and comfortable posture of the user.

Therefore, as a sofa that can be reclined including a seating portion according to the backward tilt of the user, for example, Patent Document 1 below is provided. In the sofa of Patent Document 1, the backrest portion can also be tilted independently of the seated portion, but the seated portion can also be tilted. The sofa of Patent Document 1 has a structure in which the entire sofa frame, which is an internal skeleton, is covered with thick urethane foam having abundant cushioning properties, and the sofa frame has a rising portion in which both front end portions extend upward. It consists of a leg frame, a seat frame, and a back frame. Both front ends of the seat frame are rotatably connected to both rising ends of the leg frame, and both ends of the rear part of the seat frame are rotatably connected to both ends of the lower part of the back frame. Has been done. That is, the seat frame (and the seating portion including the seat frame) of Patent Document 1 has a cantilever shape in which only the front end thereof is connected to the leg frame and there is no support mechanism for the rear end portion. Then, from the front edge of the leg frame to the central portion of the seat frame, a gas spring having an on-off valve device for adjusting the angle is erected.

Japanese Unexamined Patent Publication No. 2001-238750

In Patent Document 1, the seating portion has a cantilever shape in which only the front end is connected to the leg frame, and the entire weight is supported by one gas spring including the weight of the user. In this case, it is necessary to set the reaction force of the gas spring extremely high, and depending on the setting, the seating portion may be unintentionally tilted backward or the tilting of the seating portion may become unstable.

Therefore, the present invention solves the above-mentioned problems, and even a sofa with an integrated back seat in which the relative angle between the seat portion and the backrest portion is immovable can be stably reclined including the seat portion. It provides a sofa with an integrated back seat.

As a means for that purpose, the sofa of the present invention includes a sofa body integrated with a back seat having a seating portion and a backrest portion having an immovable relative angle with respect to the seating portion, and the sofa body is viewed from below. It is provided with a support base for supporting, a connecting mechanism for connecting the sofa body and the support base, and a connecting mechanism for tiltably connecting the sofa body to the support base.

The connecting mechanism has a front first rotating portion that is rotatably connected to the sofa body and a front second rotating portion that is rotatably connected to the support base. The front link, the rear first rotating portion rotatably connected to the sofa body behind the front link, and the rear rotatably connected to the support base. It includes a rear link having a second rotating portion, and at least an urging member that urges the link mechanism forward while the user is seated. Further, the front link is shorter than the rear link, the front link is inclined forward so that the front first rotation portion is located in front of the front second rotation portion, and the rear link is The rear first rotating portion is tilted backward so as to be located behind the rear second rotating portion.

It is preferable to provide an urging force adjusting mechanism capable of adjusting the urging force of the urging member. In this case, it is preferable to provide a stopper that regulates the rotation limit of the rear link to the front side so that the sofa body does not lean forward from the basic posture when not in use.

According to the present invention, since the weight from the sofa body is supported by both the front and rear links, the sofa body can be stably supported and the tilting motion is also stable. At this time, the basic posture of the front link (posture when not in use) is tilted forward, while the basic posture of the rear link is tilted backward, and the front link is shorter than the rear link. Further, since the first rotating portion of both the front link and the rear link is connected to the sofa body, the movements of both are always integrated via the sofa body. Therefore, when the weight of the user acts, the forward link exerts a force in the forward tilting direction, but the rear link exerts a backward tilting force larger than the force acting on the front link, so that the sofa body moves forward. It doesn't tilt.

In addition, the center point (hereinafter referred to as the sitting center point) on which the weight of the user acts on the assumption that the user normally sits, including the present invention, is set at the center of the seating portion in the anteroposterior direction. However, since the links are provided in the front and rear, the distance from the sitting center point to the rear link is also shortened, so that the urging force of the urging member that urges the rear link to its original posture is also increased. It can be designed to be relatively small.

If the urging force adjusting mechanism that can adjust the urging force of the urging member is provided, the ease of tilting the sofa body backward according to the weight of the user and the comfortable posture can be adjusted, so that the comfort is improved. At this time, if a stopper is provided to regulate the rotation limit of the rear link to the front side, the urging force of the urging member is temporarily increased and the urging force is added to the rear link even in the basic posture when the sofa is not used. Even so, it is possible to prevent the sofa body from inadvertently leaning forward from the basic posture.

It is a side view of the sofa in the basic posture. It is a side view of a sofa tilted backward. It is an exploded perspective view of a sofa. It is a perspective view of a connecting mechanism. It is an exploded perspective view of a connecting mechanism. It is a partial sectional view of a sofa. It is a side view of the sofa of a modification.

Hereinafter, specific embodiments of the present invention will be described. As shown in FIGS. 1 to 3, in the sofa of the present embodiment, the sofa main body 1, the support base 2 that supports the sofa main body 1 from below, and the sofa main body 1 and the support base 2 are connected and supported. It is provided with a connecting mechanism for connecting the sofa body 1 to the base 2 so as to be tiltable.

The sofa main body 1 is a back seat integrated type having a seating portion 1a and a backrest portion 1b integrally, and the backrest portion 1b is immovable with respect to the seating portion 1a. Therefore, when the sofa body 1 is tilted, the relative angle between the seating portion 1a and the backrest portion 1b is always constant. Although not shown, the internal structure of the sofa body 1 is not particularly limited, and any conventional general structure may be used. Specifically, the board or frame that serves as the skeleton and the cushioning material are covered with a skin. Examples of the cushion material include urethane foam and sponge. However, since the sofa is basically premised on being able to sit comfortably and relax, the cushioning material is set higher than that of chairs (chairs in a narrow sense excluding sofas, which are called chairs), and the cushioning material is chairs. It is thicker than the cushioning material used for. In addition, the cushion spring can be installed internally together with the cushion material. Therefore, the sofa body 1 is heavier than the seat plate and the backrest of the chair.

A recess 1c recessed upward is formed in the center of the lower surface of the seating portion 1a, and a connecting frame 3 is fixed to the inner upper surface of the recess 1c as a constituent member of the sofa body 1. The outer frame of the connecting frame 3 is rectangular, and connecting portions 3a with the connecting mechanism are formed at two places in front of and behind the left and right frames, for a total of four places.

The support base 2 may have enough strength to support the sofa body 1, the weight of the user, and the like, and may have a connecting mechanism installed on the upper surface, and its specific structure is not particularly limited. In the present embodiment, a trapezoidal shape is exhibited that extends from the connection mechanism installation surface in the center of the upper surface to the front, back, left, and right. A recess 2a for the adjustment knob 20 constituting the adjustment mechanism described later is formed on the front surface of the support base 2.

As shown in FIGS. 4 to 6, the connecting mechanism includes a connecting base 10, a front link 11, a rear link 12, a torsion coil spring 13 that urges the rear link 12 to the front side, and a stopper 14. The connecting base 10 has a substantially box shape with an open upper surface having left and right side walls 10a, and is fixed to the upper surface of the support base 2.

The front link 11 is rotatable in the front-rear direction at the front portion of the sofa, and the upper end portion is rotatably connected to the connecting portion 3a of the connecting frame 3 via the shaft pin 15f. The lower end of the front link 11 is rotatably connected to the left and right side walls 10a of the connection base 10 via the shaft pin 15s. As a result, the lower end portion of the front link 11 is substantially connected to the support base 2 via the connection base 10 fixed to the support base 2. Hereinafter, the position of the shaft pin 15f which is the rotation axis of the upper end portion of the front link 11 is referred to as the front first rotation portion 15f, and the position of the shaft pin 15s which is the rotation axis of the lower end portion of the front link 11 is referred to as the front second rotation portion. It is called the moving part 15s.

The rear link 12 is rotatable in the front-rear direction at the rear portion of the sofa, and the upper end portion is rotatably connected to the connecting portion 3a of the connecting frame 3 via the shaft pin 16f. The lower end of the rear link 12 is rotatably connected to the left and right side walls 10a of the connection base 10 via the shaft pin 16s. As a result, the lower end of the rear link 12 is also substantially connected to the support base 2 via the connection base 10. Hereinafter, the position of the shaft pin 16f which is the rotation axis of the upper end portion of the rear link 12 is referred to as the rear first rotation portion 16f, and the position of the shaft pin 16s which is the rotation axis of the lower end portion of the rear link 12 is referred to as the rear second rotation portion. It is called the moving part 16s.

As shown in FIG. 1, the length L ₁ of the front link 11 is shorter than the length L ₂ of the rear link 12. Further, in the basic posture when the sofa is not used, the front link 11 is tilted forward so that the front first rotating portion 15f is located in front of the front second rotating portion 15s. On the other hand, the basic posture of the rear link 12 is tilted backward so that the rear first rotating portion 16f is located behind the rear second rotating portion 16s. Further, the inclination angle θ ₁ of the front link 11 with respect to the vertical direction is smaller than the inclination angle θ ₂ of the rear link 12 with respect to the vertical direction. That is, the inclination angle θ ₂ of the rear link 12 is larger than the inclination angle θ ₁ of the front link 11. As a result, the front-rear distance T ₁ from the front first rotation portion 15f to the front second rotation portion 15s is smaller than the front-rear distance T ₂ from the rear first rotation portion 16f to the rear second rotation portion 16s. It has become. The rear second rotating portion 16s, which is the rotation center of the rear link 12, is located near the assumed sitting center point, that is, the center line of the seating portion 1a in the front-rear direction, and is the front second rotating portion which is the rotation center of the front link 11. The 2 rotating portion 15s is located at a position away from the center line of the seating portion 1a.

The left and right center portions of the lower end portion of the rear link 12 are notched, and two torsion coil springs 13 are arranged side by side between them. The torsion coil spring 13 is inserted into the outer surface of the shaft pin 16s. Therefore, the urging force on the rear link 12 acts around the rear second rotating portion 16s. The torsion coil spring 13 corresponds to the urging member of the present invention.

The rear end portion 13r of the torsion coil spring 13 extends rearward, and is arranged so as to be hooked on a receiving bar 17 erected in the middle portion of the rear link 12. The front end portion 13f of the torsion coil spring 13 extends forward, and a holding pin 18 is arranged between the two front end portions 13f on the left and right. The stopper 14 is erected at a position where it comes into contact with the front edge of the rear link 12 in the basic posture when the sofa is not used and can be restricted so that the rear link 12 does not rotate further forward. In the basic posture of the present embodiment, the seating portion 1a of the sofa body 1 is horizontal.

Further, in the present embodiment, the adjusting knob 20 is also provided as an urging force adjusting mechanism capable of adjusting the urging force by the torsion coil spring 13. Therefore, a screw groove is formed at the lower end of the holding pin 18, and is screwed with the adjusting knob 20. When the presser pin 18 is pulled into the adjustment knob 20 by rotating the adjustment knob 20, the front end portion 13f of the torsion coil spring 13 is pulled downward, and the rear end portion 13r tends to be displaced upward accordingly. As a result, the urging force to the rear link 12 increases. On the contrary, when the presser pin 18 is retracted to the outside of the adjustment knob 20 by reversing the adjustment knob 20, the downward pressing force on the front end portion 13f becomes smaller, and the rear end portion 13r follows this and is the original basic. It tries to displace to the posture, and the urging force to the rear link 12 decreases. When the adjustment knob 20 is turned upside down to the maximum, it can be set so that the urging force of the torsion coil spring 13 does not act on the rear link 12 in the basic posture. That is, the torsion coil spring 13 only needs to be able to urge the rear link 12 to the front side at least with the user seated.

Next, the operation will be described. In the basic posture shown in FIG. 1 when the user is not seated and not in use, the seated portion 1a is horizontal. At this time, the front link 11 is tilted forward so that the front first rotating portion 15f is located forward of the front second rotating portion 15s. The rear link 12 is tilted backward so that the rear first rotating portion 16f is located behind the rear second rotating portion 16s. Further, the inclination angle θ ₁ of the front link 11 with respect to the vertical direction is smaller than the inclination angle θ ₂ of the rear link 12 with respect to the vertical direction. That is, the inclination angle θ ₂ of the rear link 12 is larger than the inclination angle θ ₁ of the front link 11. As a result, the front-rear distance T ₁ from the front first rotation portion 15f to the front second rotation portion 15s is smaller than the front-rear distance T ₂ from the rear first rotation portion 16f to the rear second rotation portion 16s. ..

In the present embodiment, it is designed so that the pressing force of the pressing pin 18 on the torsion coil spring 13 does not act when the pressing pin 18 is fully retracted from the adjusting knob 20 by loosening (reversing) the adjusting knob 20 as much as possible. ing. In this case, in the basic posture, the urging force of the torsion coil spring 13 does not act on the rear link 12. That is, the torsion coil spring 13 only needs to be able to urge the rear link 12 to the front side at least with the user seated. In this urging force free state, the stopper 14 is not functioning.

On the other hand, when the adjustment knob 20 is rotated in the normal direction, the holding pin 18 is pulled into the adjustment knob 20 according to the amount of rotation thereof and is displaced downward. Then, the front end portion 13f of the torsion coil spring 13 is pressed downward according to the pull-in amount (downward displacement amount) of the holding pin 18. Along with this, the rear end portion 13r of the torsion coil spring 13 tends to be displaced upward, and the receiving bar 17 of the rear link 12 is pressed upward, so that the rear link 12 is urged in the direction of rotating forward. .. However, when the rear link 12 rotates forward from the basic posture, the seating portion 1a tilts forward. Therefore, a stopper 14 is provided so that the rear link 12 and the sofa body 1 do not incline forward from the angle of this basic posture.

When the user sits on the sofa, a load acts on the connecting frame 3 from above via the seating portion 1a. Then, since the basic posture of the front link 11 is tilted forward, a force acts in the direction of rotating forward. On the other hand, since the basic posture of the rear link 12 is tilted backward, a force acts in the direction of rotating to the rear side. At this time, since the front first rotating portion 15f and the rear first rotating portion 16f are connected to the connecting frame 3 in both the front link 11 and the rear link 12, the front rotation power and the rear link by the front link 11 are connected. The backward turning power by 12 cancels each other out. Further, in order for the front link 11 to be in the backward tilted posture, a force exceeding the vertical angle (the position where the front first rotating portion 15f comes to the apex of the movement locus) is required. Therefore, the sofa body 1 is hardly displaced only when the seated person sits in a good posture (a posture that does not lean on the backrest portion 1b) at the assumed sitting center point (the central portion of the seating portion 1a).

On the other hand, when the user sits deeply on the seating portion 1a (to a position closer to the rear end portion) or leans on the backrest portion 1b, a large load acts on the rear portion of the sofa body 1. Then, since the rear link 12 is longer than the front link 11, the rear rotation power of the rear link 12 exceeds the front rotation power of the front link 11 and the force exceeding the vertical angle according to the principle of the sofa, and the front link 11 becomes tilted backward. Then, the sofa body 1 is in a reclining posture tilted backward. At this time, by adjusting the urging force from the torsion coil spring 13 acting on the rear link 12 by the adjustment knob 20, it is possible to adjust the ease of displacement to the reclining posture and the return reaction force to the basic posture. .. When the user stands up from the sofa, the sofa body 1 returns to the basic posture by the urging force of the torsion coil spring 13.

Although the typical embodiments of the present invention have been described above, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, as in the modification shown in FIG. 7, the adjustment knob 20 for adjusting the urging force to the rear link 12 is not always necessary. In this case, the presser pin 18 may be fixed to the connecting base 10 by welding or the like, and a constant urging force by the torsion coil spring 13 can be designed depending on the length of the presser pin 18. For example, it can be designed so that the urging force does not act on the rear link 12 in the basic posture and the urging force acts only when the sofa body 1 starts to tilt backward, or the urging force acts even in the basic posture. It can also be designed as if it were. That is, the torsion coil spring 13 only needs to be able to urge the rear link 12 to the front side at least with the user seated.

If the design is such that the urging force does not act in the basic posture, the stopper 14 is not always necessary. As long as the basic posture of the front link 11 is tilted forward, the basic posture of the rear link 12 is tilted backward, and the front link 11 is shorter than the rear link 12, the sofa body 1 can be tilted forward from the basic posture. Because there isn't.

The basic posture of the seating portion 1a does not necessarily have to be horizontal, and may be designed to be slightly forward tilted or slightly backward tilted. It may be designed so that the sofa body 1 starts to tilt backward from the moment the user is seated (even when the sofa body 1 is seated in a good posture at the assumed sitting position center position).

Further, casters can be provided on the lower surface of the support base 2 to facilitate the movement of the sofa.

1 Sofa body 1a Seating part 1b Backrest part 2 Support base 3 Connecting frame 10 Connecting base 11 Front link 12 Rear link 13 Twisting coil spring 14 Stopper 15f Front first connecting part 15s Front second connecting part 16f Rear first connecting part 16s Rear 1st connecting part 18 Presser pin 20 Adjustment knob

Claims (2)

A sofa including a sofa body with an integrated back seat, which integrally has a seating portion and a backrest portion whose relative angle is immovable with respect to the seating portion.
A support base that supports the sofa body from below, and
It is provided with a connecting mechanism for connecting the sofa body and the support base and connecting the sofa body to the support base so as to be tiltable.
The connecting mechanism is
A front link having a front first rotating portion rotatably connected to the sofa body and a front second rotating portion rotatably connected to the support base.
Behind the front link, a rear first rotation portion rotatably connected to the sofa body and a rear second rotation rotatably connected to the support base. With a rear link with a part,
Includes at least an urging member that urges the rear link forward while the user is seated.
The anterior link is shorter than the posterior link
The front link is inclined forward so that the front first rotating portion is located in front of the front second rotating portion.
The rear link is a sofa in which the rear first rotating portion is tilted backward so as to be located behind the rear second rotating portion. It has an urging force adjusting mechanism that can adjust the urging force of the urging member.
The sofa according to claim 1, further comprising a stopper that regulates a limit of rotation of the rear link to the front side so that the sofa body does not lean forward from the basic posture when not in use.

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