RU1773232C - Adjustable arm-chair - Google Patents

Abstract

SUBSTANCE: in an adjustable chair, the seat contains on each side a guide rail attached to the front, from the bottom to the seat and resting on the roles connected to the frame of the chair. A transverse shaft with two guides is mounted on the base. A seat with a rear part on each side is pivotally connected to one rail attached to the frame by means of a slider. The back is equipped with a downward and forward directed profile element articulated with the first slide, while the front end of the profile element is articulated with the second slide located on a second rail connected to the frame. The first and second guides are arranged at an obtuse angle relative to each other. The distance between the back of the seat and the lower part of the back is maintained substantially constant by changing the angle between the M and the back when the back is tilted back by a person, while the sliders and the seat are moved forward. 2 s.p. f-ly, 5 ill.

Description

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WITH

The invention relates to an adjustable back chair.

Many different seat designs are known in which the backrest can deviate backward from a vertical position, whereby a person can occupy the most comfortable position. In some designs of such chairs, the backrest is rigidly connected to the seat, and the front edge of the seat tilts when the backrest is tilted back. When using a chair of this design, the angle between the hip and back of a person remains constant, however, when raising the front edge, the seat is not in a comfortable position.

In other designs, the seat is fixed and only the backrest can occupy

different positions, for such constructions, the person’s clothes will become disordered, for example, a shirt or blouse will come out of a skirt or trousers, since the person moves away from the back of the chair, and parts of the clothes cannot make such movements.

Also known are designs in which the Inca and seat are adjusted relative to each other. When the backrest is tilted back, a similar movement of the person’s back relative to the back of the chair takes place, even if the path of this movement is less than with a fixed seat, In addition to the unpleasant sensations that arise when moving clothes relative to the body, the anatomical shape of the back, which, like a bruise, corresponds to the shape of the back Xi

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the upright arm is altered so that it does not match the shape of the person’s back when it is in a chair with its back folded back. This is usually due to the fact that the angle between the back and the seat increases with the back tilted backward and the distance between the back of the seat and the lower part of the back increases.

The chair of the present invention eliminates these drawbacks, while the human back, both in the vertical position of the chair and in the tilted back position, will rest on the same part of the back of the chair, and the distance between the back of the seat and the lower part of the back will be maintained constant during the reclining process. When the back of a chair is pushed back by a person, the back and seat of the chair will make movements that follow the movements of the back and hips of a person when he reclines. Thus, a person can occupy an anatomically correct posture and comfortably sit in a chair, the back of which occupies both a vertical and an inclined back position.

In FIG. 1 is a schematic side view of a chair with a backrest in an upright position; in FIG. 2 - a chair whose back is deflected to hell; in FIG. 3 - a chair whose positions are aligned, the inclined position being shown by dashed lines; in FIG. 4 is a transformation mechanism indicating the geometric relationships that are used as a basis for moving parts of the chair; in FIG. 5 is a rear view of a twin chair with two seats that can be turned face-up in opposite directions.

The base 1, mounted with the possibility of rotation around a vertical axis on the plate 2, is mounted on the foundation. On the base 1, a transverse rod 3 is fixed. It is connected mainly with two seats 4 and corresponding backs 5. On both sides of the transverse rod 3 there are installed guides 6 and 7, one of which is facing the back and the other to the front of the seat. In the vertical plane, the guides b and 7 are located at an obtuse angle to each other. On the guides b and 7, the first and second sliders 8 and 9 are mounted with the possibility of reciprocating movement.

The backrest 10 has a supporting profile element 11, with the lower part of which are connected by hinges 12 and 13, the first and second

the sliders 8 and 9. The guides 6 and 7, as well as the elements associated with them, are located on both sides of each seat 4. The distance between the hinges 12 and 13, between the back profile 11 and the sliders 8 and 9 can be adjusted according to the known way.

The roller 14 cooperates with the open frame of the chair, which is associated with the base 1. The roller 14 is supported by a guide rail 15, which is attached to the seat 4 in its front part. The guide rail may be flat or rounded. The back of the seat is attached to a hinge 13, which is also connected to the first slider 8.

When the backrest 10 of the chair is pressed back, and the seat 4 is pressed forward by the corresponding efforts of the hips, then the sliders 8

and 9 are displaced on guides 6 and 7, and the rail 15 is rolled along the roller 14. Thereby, the angle between the seat 4 and the backrest 10 is simultaneously increased without any noticeable increase

the distance between them. When the first slider 8 moves forward, the pneumatic shock absorber 16 is compressed because it is connected to the hinge 13 and the front of the chair frame. The gas pressure in the shock absorber will dampen the movement of the seat and back, raising the back to a vertical position when the corresponding release device is triggered. By acting on the pedals 17 located on both sides of the chair, the pneumatic shock absorber 16 can be disconnected, ensuring that the chair back is in a vertical position and the stopper is simultaneously released between the base 1 and the stove 2,

so that the chair can be rotated in a horizontal plane, turning it in the opposite direction.

In FIG. 4 schematically shows the geometric relations defining

movements of the backrest 10 and the seat 4, interconnected. The distance between the hinges 13 and 12 can be adjusted, and the distance between the hinge 13 and the roller 14 is fixed in size

different elements of the chair, while the distance b remains the same. Correspondingly, an obtuse angle a between the guides b and 7 is fixed, as well as the angular arrangement of the guides relative to the base, i.e. angle.

The guide rail 15 may be flat, as shown in FIG. 1-3, or it may be rounded as shown in FIG. 4, providing front movement

parts of seat A along a defined path. The dimensions a, b, c, a, /, as well as the curvature of the rail 15 are parameters that determine the movements of the seat and backrest relative to the base on which the person’s feet are placed, as well as the mutual movements of the seat and backrest.

As shown in FIG. 3, the design of the chair provides mutual movement of the seat 4 and the backrest 10 in an angular direction so that the person always contacts the back with the back of the chair, and the hips with the seat. Additionally, the lower part of the backrest 10 is moved forward, so the person behind the chair this usually takes place in a railway carriage, has enough space so that its knees do not touch the front seat, even if its back is reclined.

The seat movement of the chair is determined by two linear movements of the hinges 12 and 13, and the spatial movement of the backrest 10 is determined by a combination of both of these linear movements. Simultaneously, the movement of the seat 4 is reached by the rear of the seat, which will follow the movement of the rear hinge 13, and the front of the seat 4, which is guided by the roller 14 and the appropriate movement of the front, is provided with the corresponding shape of the rail 15 lying on the roller 14.

The pedal 17 is not related to the movement of the backrest 10 or the seat 4. The sole function of the pedal is to release the entire structure to rotate 180 ° on the base 1 in cases where the chair is used as a double chair in railway cars, i.e. the chair should rotate 180 ° when the train is traveling in the opposite direction.

Thus, in this chair the movement of the seat is provided by the roller 14 and the rail 16, while the movement of the back of the chair is controlled by the first and second guides 6 and 7. When the chair moves to the unfolded position, its fabric upholstery is not tensioned due to the constant angle between the seat and when folding, while the connection between the back and the seat is maintained.

It is also significant that the backrest moves forward when the chair is moved to a different position. This property creates important advantages for row-mounted seats, such as seats in a railway carriage, when it is important that the backrest does not interfere with a person sitting in the rear seat.

Claims (3)

1. An adjustable chair containing a connected seat and back, installed with the possibility of movement to change the inclination of the backrest using a device including a guide that is connected to the frame of the seat and a guide along the seat, interacting with the slide guide and a pneumatic shock absorber connected to the frame of the chair and with a guide, characterized in that in order to improve operational qualities and increase ease of use, the back is equipped with a profile element having a curved lower section located under the seat, the seat is equipped with rear side its front guide rail, which engages by a roller pnevmoamortizator, guide devices for moving the backrest and the seat is 5 two diametrical sections diametrically located along the seat, on which are mounted with the possibility of reciprocating movement of the slide, while the rear part of the seat and the profile element of the back in the bend zone are pivotally connected to the slide installed on the guide section facing the back. , and with the slider installed in the opposite section 5 of the guide, pivotally connected the end of the curved section of the profile element of the back, and both sections of the guide in the vertical plane are placed one relative to the other at an obtuse angle for 0 maintaining a constant distance between the lower end of the back and the rear end of the seat when deflecting the back and changing the angle between the back and the seat, 2. A chair according to claim 1, characterized in that the pneumatic shock absorber is connected with a slider placed on the guide portion facing the back and with a frame, and when the back is folded back, it is made tensioned, and the chair has means for releasing the pneumatic shock - jamming and moving the slider associated with it along a guide towards the back to return the latter to a vertical position. 5 3. The chair according to claim 2, characterized in that the means for releasing the pneumatic shock absorber has pedals located on both sides of the chair, consisting of two seats and two backs mounted on a common transverse rod guide fixed to a central base connected to in this case, when the pedal is acted upon, the pneumatic shock absorbers are released when acting on the pedal o6oVix seats to return both backs to a vertical position, and the base has the ability to freely rotate around a vertical axis. 10 Figure 1 eleven Fie.Z S s AND TO b + .t V