WO2010120139A2

WO2010120139A2 - Seating furniture having movable backrest

Info

Publication number: WO2010120139A2
Application number: PCT/KR2010/002364
Authority: WO
Inventors: 이종호
Original assignee: (주)에이포
Priority date: 2009-04-15
Filing date: 2010-04-15
Publication date: 2010-10-21
Also published as: EP2420159A2; US20120038195A1; JP5544009B2; EP2420159B1; KR100919418B1; CN102395296A; JP2012523886A; WO2010120139A3; EP2420159A4

Abstract

The present invention relates to seating furniture, and more specifically, to seating furniture having a movable backrest, which allows a user's back to be supported by a backrest at all times in order to enable seating with proper posture, and comprises: a lower frame which is connected to a support; an upper frame which is connected to the lower frame via a vertical displacement generation means; at least one elastic body which is installed between the lower frame and upper frame; a back and forth moving means which is formed at the edge of the left and right sides of the upper frame, and is connected to a backrest frame to move back and forth; a power generation unit which converts the displacement according to the descent of the upper frame into a straight line movement at the back and forth moving means if a load is applied to a seat unit combined to the upper frame, thereby moving the backrest frame forward; and a switching unit which switches to a half-lock state in which the backrest frame can move forward only if a load is applied to the seat unit, and to an unlock state in which the backrest frame can move backward if the load applied to the seat unit is removed.

Description

Seat furniture with backrest

The present invention relates to seat furniture, and more particularly, to a technology that allows the back of the seat furniture to always support the wearer's back so as to be seated in the correct posture.

As the time spent sitting on a furniture such as a chair or a sofa occupies a large part of the time, an increasing number of people suffer from poor seating posture. The cause of this problem is that people sit with their backs bent instead of seating their backs and hips in close contact with their backs when seated in seating furniture.

In this regard, a number of chairs that allow the backrest to be moved to support the back portion has been disclosed, and a typical example is the technology of Korean Patent Application No. 10-2007-0060533 by the present inventors.

The technology is that when a person sits in the seat portion, the driving force is generated due to the load and the backrest is advanced so that the backrest can be in close contact with the back portion. There was a limit to the application of the chair and there was a limit to improving the appearance of the chair. In addition, there is a need for improvement because the structural stability is also degraded, which can be a problem in durability.

Therefore, the present invention is to provide a seat furniture that is more compact, structurally more stable, the backrest is moved can be applied to a variety of seat furniture.

The present invention for achieving the object as described, in the seat furniture to which the backrest is moved, a lower frame connected to the support; An upper frame connected to the lower frame through a vertical displacement generating means; At least one elastic body installed between the lower frame and the upper frame; Front and rear movement means which are formed at left and right edges of the upper frame and connected to the backrest frame and move in the front and rear directions; A power generation unit for converting the displacement according to the lowering of the upper frame into a linear motion from the forward and backward moving means to move the back frame forward when a load is added to the seat unit coupled to the upper frame; When the load is applied to the seat part, the back frame is in a half-lock state which can only move forward, and when the load applied to the seat part is removed, the back frame can be moved back to unlock. It proposes a seat furniture that the backrest is moved, characterized in that it comprises a;

Preferably, the vertical displacement generating means proposes a seat furniture to which the backrest is moved, comprising a plurality of vertical slides or a plurality of foldable link plates that are linearly connected by connecting the lower frame and the upper frame.

Preferably the power generating unit and the vertical rack gear installed in the vertical direction on the upper surface of the lower frame; A gear box coupled to the upper frame; A pinion gear coupled to the first shaft installed at the lower side of the gearbox and engaged with the vertical rack gear; A vertical bevel gear adjacent to the pinion gear and coupled to the first shaft; A spur gear installed in the gearbox in a horizontal direction and connected to a horizontal bevel gear connected to the vertical bevel gear on a lower surface thereof to rotate; And a horizontal rack gear coupled to the lower side of the backrest and engaged with the spur gear to transmit power to the backrest frame, wherein the backrest is moved.

Preferably, the power generating unit proposes a seat furniture to which the backrest is moved, characterized in that the stopper is connected to the stop lever on one side of the spur gear and is selectively engaged with or released from the spur gear.

Preferably, the switching unit includes a rotation latch coupled in the front and rear direction inside the upper frame so that the rotation direction is changed according to the presence or absence of a load in the seat portion; It proposes a seat furniture to which the backrest is moved, characterized in that it comprises a; hook hook which is connected at the bottom of the backrest frame and can be rotated within a limited angle range and selectively coupled or separated with respect to the pivoting latch.

Preferably, the seat furniture to which the backrest is moved is a seat portion which can move up and down with the rear end portion of the upper frame as a fixing portion, and a pusher is formed on the lower end of the front end of the seat portion and connected to the front end portion of the pivoting latch. According to the movement of the seat unit proposes a seat furniture to move the backrest, characterized in that configured to enable the rotation operation of the rotation latch.

Preferably, the pusher includes: an upper pusher facing the lower surface of the seat portion; An upper end portion inserted through the lower side of the upper pusher and movable, and a lower end pusher coupled to the pivoting latch; It proposes a seat furniture to move the backrest, characterized in that consisting of; coil spring is installed between the upper pusher and the lower pusher.

Preferably, the switching unit is provided with a latch guide is formed between the rotary latch and the latch hook perforated in the front and rear direction, the latch hook is formed with two restriction pins protruding at a distance and the latch hook is the slot The seat furniture is moved backrest is characterized in that the rotation angle of the latch hook to be limited by being installed to pass through but restrained by two restriction pins.

More preferably, the switching unit proposes a seat furniture to which the backrest is moved, characterized in that the release lever is provided to press the front end of the rotating latch to unlock the rotating latch.

The seat furniture in which the backrest is moved according to the present invention basically has the effect of helping the user to maintain the correct posture by supporting the user's back by automatically moving the backrest when seated, and at the same time, the office chair can be compactly configured. In addition, it is effective to be used for various types of chairs such as student classroom chairs, sofas, or train or aircraft chairs.

1 is a schematic partial perspective view of a seat furniture according to a first embodiment of the present invention;

2 is a partial cross-sectional view seen from the front.

3 is a sectional view seen from the side.

4 is a plan view.

5 is a partial perspective view showing some components including a bottom frame;

6 is a cross-sectional view showing the front and rear movement means used in this embodiment.

Figure 7 is a partial perspective view showing the main part of the power generating portion.

8 is a perspective view of an essential part showing a coupling state of the switching unit;

9 is a schematic cross-sectional view of a chair according to the second embodiment.

Fig. 10 is a schematic side view showing the structure of the link plate.

10: seat portion 20: backrest

30: support 100: lower frame

200: upper frame 300: vertical displacement generating means

300a: link plate 310: plate unit

320: connecting bracket 400: elastic body

500: forward and backward movement means 510: fixed rail

520: intermediate rail 530: movable rail

540: Ball 531: Bracket

600: back frame 700: power generation unit

710: vertical rack gear 720: gearbox

730: pinion gear 740: vertical bevel gear

750: horizontal bevel gear 760: spur gear

770: Horizontal Rack Gear 780: Guide Roller

790: stopper 800: switching unit

810: rotating latch 820: latch hook

821: limiting pin 830: pusher

831: upper pusher 832: lower pusher

833: coil spring 840: latch guide

841: slot 850: release lever

Hereinafter, a detailed description of the seat furniture (hereinafter referred to as the seat furniture) to which the backrest is moved according to the present invention will be described in detail with reference to the preferred embodiment provided as a means to help understanding of the present technology. Reference is made to the drawings. However, the drawings presented are only one example implemented in accordance with the technical spirit of the present invention, and the present invention may be implemented by adding a simple design change by another person or replacing some of the components with equivalent elements. It should be understood that it is included in the technical scope of the.

First Embodiment

First, the seat furniture according to the first embodiment will be described, and FIG. 1 shows a schematic partial perspective view thereof. The first embodiment shows a case where the technique of the present invention is applied to something such as a general office chair. 2 is a partial sectional view seen from the front, FIG. 3 is a sectional view seen from the side, and FIG. 4 is a plan view.

When the user is seated on the seat 10 constituting the chair, the backrest 20 is automatically advanced to support the back part of the user as the lower frame 100, the upper frame 200, The vertical displacement generating means 300, the elastic body 400, the front and rear movement means 500, the backrest frame 600, the power generation unit 700, the switching unit 800 is configured to include.

The lower frame 100 is a portion fixedly connected to the support 30, wherein the support 30 means a lower side mainly including the leg of the chair. The support 30 may vary in shape or function depending on the type of seating furniture, and in the case of the office chair of the present embodiment, there are many things that may change the height of the support itself. That is, in consideration of the height of the user to be able to vary the length of the support portion as needed, the technique for adjusting the height of such a support is a known technique.

5 is a partial perspective view showing some components including a lower frame, the lower frame 100 is connected to the upper end of the support 30 as shown, the upper and lower displacement generating means on the left and right sides of the lower frame 100 300 is installed. The upper frame 200 is positioned above the lower frame 100 through the vertical displacement generating means 300. The vertical displacement generating means 300 in the present embodiment is that the upper frame 200 can move vertically with respect to the fixed lower frame 100 is used that the linear movement is made while rolling a plurality of balls along the rail Doing. If it is a linear sliding movement, such as an LM guide can be used. The vertical displacement generating means used in this embodiment will be referred to as vertical slider. This has the same configuration as the back and forth moving means described later.

One or more elastic bodies 400 may be installed between the lower frame 100 and the upper frame 200 to provide repulsive force. Preferably, a coil spring may be used. That is, the elastic body 400 is the upper frame 200 is lowered when a person sits on the seat 10, the elastic body 400 is contracted to store the repulsive force and the load is removed, the elastic body 400 is restored to the upper frame Will push the 200.

When the load is applied to the seat 10, the backrest frame 600 is moved forward while linearly moving, and the back and forth movement means 500 for linear movement of the backrest frame 600 is provided. The front and rear movement means 500 is installed in the front and rear direction on the left and right inner edge of the upper frame 200 and forms a structure connected to the backrest frame 600. The front and rear movement means 500 may be any one that can be linearly moved, and in this embodiment, one having the same type as the vertical displacement generating means 300 described above is used.

6 is a cross-sectional view showing the front and rear movement means 500 used in the present embodiment, the vertical displacement generating means 300 also has the same configuration except for the difference in length. As shown, the front and rear movement means 500 is provided with a fixed rail 510 fixed to the upper frame 200, the fixed rail 510 is a length corresponding to the length of the front and rear direction of the upper frame 200 Has An intermediate rail 520 having a shorter length than the fixed rail 510 is formed on the inner side of the fixed rail 510, and the movable rail 530 is coupled into the intermediate rail 520. On the other hand, a plurality of balls 540 are fitted to the intermediate rail 520 and the ball 540 is in contact with the fixed rail 510 and the movable rail 530 to make a cloud movement. On the other hand, the upper frame 200 is connected to the bracket 531 coupled to the movable rail 530, the back frame 600 may be linearly moved by the power generated by the power generating unit 700 to be described later. That is, when the backrest frame 600 linearly moves forward and backward, the intermediate rail 520 and the movable rail 530 move simultaneously with respect to the fixed rail 510. In particular, the movable rail moves more than the amount of movement of the intermediate rail. Have a distance. The back and forth moving means showing this mechanism corresponds to a technique known as a purchased product.

Next, the power generation unit 700 will be described, and FIG. 7 corresponds to a partial perspective view showing a main part of the power generation unit.

In the power generating unit 700, the load is applied to the seat unit 10 coupled to the upper frame 200, so that the front frame 200 is converted to linear movement by using the displacement as the upper frame 200 is lowered. It functions to be and through this is a part to allow the advance of the backrest frame 600.

More specifically, the structure of the power generation unit 700 will be described.

Vertical rack gear 710, gearbox 720, pinion gear 730, vertical bevel gear 740, horizontal bevel gear 750, spur gear 760, and a horizontal rack gear 770, the vertical rack gear 710 is installed in the vertical direction on the lower frame 100, the pinion gear 730 to be described later is engaged. On the other hand, the gearbox 720 is installed on the upper frame 200, the first shaft (s1) is installed in the horizontal direction on the lower side constituting the gearbox 720 and the pinion gear (1) on the first shaft (s1) 730 and the vertical bevel gear 740 is installed. The pinion gear 730 meshes with the vertical rack gear 710, and the pinion gear 730 and the vertical bevel gear 740 may be integrally rotated.

In addition, the spur gear 760 lying horizontally in the gearbox 720 may be rotated upward from the vertical bevel gear 740. The vertical bevel gear may be disposed on the lower surface of the spur gear 760. The horizontal bevel gear 750 connected to the 740 is coupled. When the upper frame 200 is lowered through the coupling relationship as described above, the pinion gear 730 is rotated along the vertical rack gear 710 and the rotational force is transferred to the horizontal bevel gear 750 through the vertical bevel gear 740. And the spur gear 760 is rotated.

The spur gear 760 is rotated by the power generated by the displacement due to the lowering of the upper frame 200, and the horizontal rack gear is to transmit the rotational force of the spur gear 760 to the back frame 600 ( 770 is further provided. The horizontal rack gear 770 is coupled to the upper end at the lower side of the back frame 600 and is disposed in the front and rear direction so that the back frame 600 can be moved by linear movement as the spur gear 760 rotates. . More preferably, the outer surface of the horizontal rack gear 770 on the one side of the upper surface of the gearbox 720 so that the horizontal rack gear 770 can be accurately engaged in the spur gear 760 (the opposite of the gear teeth formed) Surface) and the guide roller 780 is rotated in contact. Since the horizontal rack gear 770 having a relatively long length is supported by the guide roller 780 at the point where the horizontal rack gear 770 is engaged with the spur gear 760, the meshing between the spur gear 760 and the horizontal rack gear 770 is precisely performed. Can be made so that smooth power transmission can be achieved.

Further preferably, the stopper 790 may be provided in the power generating unit 700 to forcibly block rotation of the spur gear 760 to fix the back frame 600 in one position. 790 is connected to the stop lever 791 so that the engagement with the spur gear 760 can be made or released by the operation of the stop lever (791). That is, when the stopper 790 is engaged with the spur gear 760, the backrest frame 600 is able to stay in the moved position without retreating even if the load applied to the seat portion 10 is removed. The stopper 790 is rotatably connected to one side of the gearbox 720 as shown, and is coupled to the end of the stop lever 791 to raise or lower the stop lever 791 by spur gear 760. ) Is cracked down.

In the present embodiment, the power generating unit is configured using a plurality of gears, but it is obvious that the belt or chain can be configured.

Next, the switching unit 800 will be described. FIG. 8 corresponds to a perspective view of a main part showing a coupling state of the switching unit, and will be referred to together with FIGS. 2 to 4.

The switching unit 800 has a half-lock state in which the backrest frame 600 is only movable forward in a state in which load is applied to the seat unit, such as when the user is seated on the seat unit 10. When the working load of the seat part 10 is completely removed, the backrest frame 600 may be switched to an unlocked state so that the backrest frame 600 may be moved backward. That is, when the user sits on the seat unit 10, the back frame 600 is advanced by the power generation unit 700 described above. At this time, the switching unit 800 has no response to the forward movement of the back frame 600. When the backrest frame 600 is in contact with the user's back part, the backrest frame 600 is restricted from moving backward so that the backrest frame 600 is not retracted from the current position. This state may be referred to as a half-lock state and prevents such a phenomenon that the back frame 600 suddenly retracts even when the user moves while the user is seated or a temporary load decreases.

On the other hand, when the user is seated and stands up from the chair, since the external force acting on the seat 10 becomes zero, the upper frame 200 is raised, and accordingly, the back frame 600 is retracted from the power generating unit 700. It creates a force that can be. Because of this, the back frame 600 should be moved back to the initial position, so the switching unit 800 should be in an unlocked (unlock) state so that there is no restriction in the backward movement of the back frame 600.

Looking at a more specific configuration of the switching unit 800 includes a pivoting latch 810 and a latch hook 820, the pivoting latch 810 is installed in a form capable of rotating in the front-rear direction in the upper frame 200. As shown, the rotation latch 810 is installed to be parallel to the front and rear movement means 500 which is installed on any one edge of the upper frame 200 and is rotatably supported at both front and rear ends. The rotation latch 810 is rotated inward when the load is applied to the seat portion 10, and has a movement to be rotated outward when the load is removed.

The latch hook 820 is connected to the lower surface of the backrest frame 600 and is installed to be rotatable within a limited angle range so as to be coupled to or separated from the pivoting latch 810 to move forward or back of the backrest frame 600. It functions to enable the retreat movement or the restriction of retreat movement. As shown in the figure, the latch hook 820 has a sharp pointed shape so that the latch hook 820 can be engaged with the rotational latch 810 forming the sawtooth. Will not be.

The rotation latch 810 is as described above, the rotation direction is determined according to the case that the load is not applied to the seat portion 10 and the case, more specifically, the rotation latch 810 and the seat portion 10 I will explain the relationship with

In this embodiment, the rear end of the seat 10 is coupled to the rear end of the upper frame 200, but the front end of the seat 10 may be moved up and down. Therefore, when the user sits on the seat 10, the front end of the seat is pressed downward while moving downward. The pusher 830 connected to the front end of the pivoting latch 810 is disposed on the lower end surface of the front end of the seat portion 10 so that the pivoting direction of the pivoting latch 810 moves in accordance with the movement of the seat portion 10. This can be determined.

More specific structure of the pusher 830 connected to the rotation latch 810 is as follows.

The pusher 830 includes an upper pusher 831 and a lower pusher 832, and a coil spring 833 is installed between the upper pusher 831 and the lower pusher 832. The upper end of the upper pusher 831 is directed toward the lower surface of the seat portion 10, and the upper end of the lower pusher 832 is inserted into the lower end of the upper pusher 831 to form a structure that can move and the lower pusher 832 The lower end is connected to the front end of the rotation latch 810. That is, while the upper end of the lower pusher 832 is inserted into the upper pusher 831, a coil spring 833 is installed therebetween. When a load acts on the seat 10, the upper pusher 831 is pressed to move downwards. At this time, while the force is transmitted through the coil spring 833, the lower pusher 832 is pressed while the rotation latch 810 is inward. To be rotated. When the pivoting latch 810 is rotated inward, the switching unit 800 is in a half-lock state, and since the latch hook 820 is not engaged with the pivoting latch 810, the backrest frame 600 is forward. Can be moved to. On the other hand, when the backrest frame 600 is temporarily fixed after moving forward, the latch hook 820 is held in engagement with the pivoting latch 810 to limit the movement of the backrest frame 600 to the rear. .

The latch hook 820 constituting the switching unit 800 must be rotated within a limited angle range so that the end of the pivot latch 810 and the latch hook 820 can be engaged. To this end, in the present embodiment, a latch guide 840 having a slot 841 is drilled between the rotation latch 810 and the installation position of the latch hook 820. The latch guide 840 is installed in the upper frame 200, and the latch hook 820 is partially inserted into the slot 841. In particular, the latch hook 820 is formed with one restriction pin 821 near the end and spaced apart from the other restriction pin 821 is formed. The latch hook 820 may be rotated in a limited range by the two restriction pins 821, and one restriction pin 821 is disposed on the left and right sides of the slot 841.

More preferably, in configuring the switching unit 800, the rotation latch 810 is adjusted to an unlocked state as necessary so that the position of the backrest frame 600 can be finely adjusted even while sitting on a chair. To this end, by pressing the front end of the rotation latch 810 to leave the release lever 850 to be rotated outward. The movement of the rotation latch 810 to the outside while a person is sitting on a chair is achieved by the structure of the pusher 830. That is, the pusher 830 mentioned above is formed to have the coil spring 833 between the upper pusher 831 and the lower pusher 832, and the lower pusher 832 is inserted into the upper pusher 831 to move. When the coil spring 833 is compressed by moving the release lever 850, the lower pusher 832 is raised along the fixed upper pusher 831, so that the adjustment of the rotation latch 810 is possible. will be.

Second Embodiment

Next, a second embodiment of the present invention will be described. The present embodiment shows a case where the technology of the present invention is applied to a chair that can be used by students in a classroom, such as a school.

Unlike the first embodiment, there is a difference in the shape of the support frame 30 to which the lower frame 100 is fixedly installed and the shape of the lower frame, and in particular, a vertical displacement generating means for connecting the upper frame 200 and the lower frame 100. 300 is characterized in that it consists of a plurality of folding link plate (300a). 9 is a schematic cross-sectional view of a chair according to a second embodiment, and FIG. 10 is a schematic side view showing the structure of a link plate.

As shown, the link plate 300a is formed in four directions so that the upper frame 200 and the lower frame 100 can be stably connected, and the upper portion of the link plate 300a connects the plate unit 310 which forms an approximately c-shape with an axis. The frame 200 may move up and down with respect to the lower frame 100. In order to connect the plate unit 310 to the upper frame and the lower frame to restrain the A-shaped connecting bracket 320 to the upper frame 200 and the lower frame 100 and to connect the plate unit by the shaft. Preferably, the size of the plate unit unit 310 located at the top is the largest and smaller toward the bottom to form a link plate 300a that can be folded without a plurality of plate unit units 310. Since the movement relationship of the other backrest frame is the same as in the first embodiment, description thereof will be omitted.

The seat furniture to which the backrest is moved according to the present invention can be applied not only to the general office chair or school classroom chair described above, but also to a sofa, and can also be used as a train or aircraft chair.

The seating furniture of the present invention supports the back part by automatically moving the backrest frame by simply sitting on the seat, thus supporting the back part so as to help maintain a correct posture on all chairs and sofas such as student chairs, office chairs, and home chairs. It is a technique that can be used. Furthermore, the present invention is expected to be widely applied to a train chair, an aircraft chair, and the like in specific applications.

Claims

In the seat furniture in which the backrest is moved,

A lower frame connected to the support;

An upper frame connected to the lower frame through a vertical displacement generating means;

At least one elastic body installed between the lower frame and the upper frame;

Front and rear movement means which are formed at left and right edges of the upper frame and connected to the backrest frame and move in the front and rear directions;

A power generation unit for converting the displacement according to the lowering of the upper frame into a linear motion from the forward and backward moving means to move the back frame forward when a load is added to the seat unit coupled to the upper frame;

When the load is applied to the seat part, the back frame is in a half-lock state which can only move forward, and when the load applied to the seat part is removed, the back frame can be moved back to unlock. The seat furniture to which the backrest is moved, characterized in that it comprises a;
The method of claim 1,

The vertical displacement generating means,

Seat furniture to which the backrest is moved, comprising a plurality of vertical slides or a plurality of foldable link plates that are linearly connected by connecting the lower frame and the upper frame.
The method of claim 2,

The power generation unit,

Vertical rack gear is installed in the vertical direction on the upper surface of the lower frame;

A gear box coupled to the upper frame;

A pinion gear coupled to the first shaft installed at the lower side of the gearbox and engaged with the vertical rack gear;

A vertical bevel gear adjacent to the pinion gear and coupled to the first shaft;

A spur gear installed in the horizontal direction in the gearbox and having a horizontal bevel gear connected to the vertical bevel gear on a lower surface thereof to be rotated;

The backrest is coupled to the lower back and is engaged with the spur gear horizontal rack gear for transmitting power to the backrest frame; seat furniture is moved backrest characterized in that it comprises a.
The method of claim 3,

The power generation unit,

The seat furniture to which the backrest is moved, characterized in that the stopper is connected to the stop lever on one side of the spur gear and is selectively coupled to or released from the spur gear.
The method according to any one of claims 1 to 4,

The switching unit,

A rotation latch coupled to the inside of the upper frame in the front-rear direction so that the rotation direction is changed according to the presence or absence of a load in the seat part;

And a latch hook connected to the back frame bottom surface, the latch hook being rotatably operated within a limited angle range and being selectively coupled or separated with respect to the pivoting latch.
The method of claim 5,

The seat furniture to which the backrest is moved,

The seat portion may move up and down with the rear end portion of the upper frame as a fixed portion, and a pusher is formed on the lower end of the front end portion of the seat portion to be connected to the front end portion of the pivoting latch to rotate the pivoting latch according to the movement of the seat portion. Seat furniture to which the backrest is moved, characterized in that configured to enable operation
The method of claim 6,

The pusher is,

An upper pusher facing the lower surface of the seat portion;

An upper end portion inserted through the lower side of the upper pusher and movable, and a lower end pusher coupled to the pivoting latch;

The seat furniture to which the backrest is moved, characterized in that consisting of; coil spring is installed between the upper pusher and the lower pusher.
The method of claim 5,

The switching unit,

A latch guide having a slot formed in the front and rear direction is provided between the rotation latch and the latch hook, and the latch hook has two restriction pins protruding at a separation distance, and the latch hook is installed to pass through the slot. The seat furniture to which the backrest is moved, characterized in that the rotation angle of the latch hook is limited by making the state restricted by two restriction pins.
The method of claim 5,

The switching unit,

The seat furniture to which the backrest is moved, characterized in that the release lever is provided to press the front end of the pivoting latch to unlock the pivoting latch.