ES2801950A1 - MECHANISM TO CHANGE AN ARMCHAIR FROM LYING TO SITTING AND VICEVERSE (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Mechanism to move an armchair (100) from lying to sitting position and vice versa that comprises a first support bar (1), a second bar (2) joining the first end of the first bar (1) with the lower end of the backrest (5) of the armchair (100); a third bar (3), with one end attached to the lower end (9) of the back (5) of the armchair (100) and to the end of the second bar (2), and with another end attached to the seat (6) of the chair (100); and a fourth bar (4) joining the second end (8) of the first bar (1) with the connection between the third bar (3) and the seat (6) of the armchair (100); where the center of gravity (11) and the instantaneous center of rotation (12) of the mechanism maintain a horizontal distance (13) between them always less than approximately 10 cm. (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

MECHANISM TO TRANSFER AN ARMCHAIR FROM LYING TO SITTING

AND VICE VERSA

Field of the invention

The present invention refers to a mechanism for moving a chair from a lying position to a sitting position and vice versa, which greatly facilitates the change of position from sitting to lying down and from lying down to sitting, since the effort required to make the change in position is minimum. The mechanism for an armchair is applicable in the furniture industry, specifically in the industry dedicated to armchairs or armchairs.

Background of the invention

Sofas or armchairs that have a mechanism to turn a seat into a lounger or almost into a bed, are increasingly integrated into the furniture of our homes.

Traditionally, for a user to go from a sitting position to a lying position, it was necessary to make a significant effort by pushing the backrest with the user's back when the user is already sitting in the seat.

An update of this system, widely implemented today in sofas or seats, consists of a mechanism that blocks the area reserved for supporting the legs in a vertical position and without extending and the backrest in a sitting position, so that pulling With one tab, the mechanism releases the area reserved for the support of the legs, which rises automatically and also rotates the backrest so that it passes into a lying position. This mechanism, although the passage from sitting to lying down is very simple, to return the chair to the sitting position, it is necessary to make a high effort with the legs to return the area reserved to support the legs in the position. initial vertical where it is blocked by the mechanism.

Therefore, mechanisms are widely known that lock and release the relative position of the back and seat, by means of elements located on the armrests, these mechanisms being limited to furniture for terraces, swimming pools and the like.

Thus, it seems desirable to find a mechanism that, without the need to resort to any electric motor, allows a user to change the position from lying down to sitting without effort or with little effort, as occurs with the mechanism object of the invention.

Description of the invention

The object of the invention is a mechanism for moving an armchair from lying to sitting position and vice versa, where the armchair comprises a backrest with a lower end and an upper end, and a seat.

The mechanism object of the invention comprises a first support bar, said first bar has a first end and a second end; a second bar joining the first end of the first bar with the lower end of the back of the chair; a third bar with one end attached to the lower end of the back of the chair and to the end of the second bar and with another end attached to the seat of the chair; and a fourth bar joining the second end of the first bar with the end of the third bar attached to the seat of the chair.

The mechanism object of the invention also has a center of gravity that moves with the movement of the bars and an instantaneous center of rotation that also moves with the movement of the bars, such that the horizontal distance between the center of gravity and the instantaneous center of rotation is so small (10 cm) that the efforts required to change from sitting to lying position, and vice versa, are minimal.

The mechanism for moving a chair from a lying position to a sitting position and vice versa, object of the invention, comprises a locking positioner to block the mechanism in a sitting position or in a lying position.

In the preferred embodiment of the mechanism for moving a chair from a lying to a sitting position and vice versa, the first bar measures 700 mm, the second bar measures 535 mm, the third bar measures 150 mm, and the fourth bar measures 531 mm.

Brief description of the drawings

Figure 1 shows a side view of the mechanism object of the invention with the chair in a sitting position.

Figure 2 shows a side view of the mechanism object of the invention with the chair in an intermediate position between sitting and lying down.

Figure 3 shows a side view of the mechanism object of the invention with the chair in the lying position.

Figure 4 shows the locking positioner of the mechanism object of the invention to lock the armchair in a lying or sitting position.

Figure 5 shows a chair in a sitting position like figure 1 with the mechanism drawn on the chair.

Figure 6 shows a chair in an intermediate position between sitting and lying down as in Figure 2 with the mechanism drawn on the chair.

Figure 7 shows an armchair in a lying position as in figure 3 with the mechanism drawn on the armchair.

The different numerical references that are reflected in the figures correspond to the following elements:

1. first bar,

2. second bar,

3. third bar,

4. fourth bar,

5. backrest,

6. seat,

7. first end of the first bar,

8. second end of the first bar,

9. lower end of backrest,

10. spring lock positioner,

11. center of gravity of the mechanism,

12. instantaneous center of rotation of the mechanism,

13. horizontal distance between the center of gravity of the mechanism and the instantaneous center of rotation of the mechanism,

14. seat angle with respect to the ground,

15. relative angle between seat and backrest, and

100. armchair;

Detailed description of the invention

In view of the foregoing and referring to the numbering adopted in the figures, the object of the invention is a mechanism to move a chair (100) from a lying position to a sitting position and vice versa.

In addition to the four bars (1,2, 3, 4) of the mechanism object of the invention, the armchair (100) has a back (5) and a seat (6), with both the back (5) and the seat ( 6) attached to at least one of the bars (1,2,3,4) of the mechanism object of the invention, as explained in detail later in this same description.

The mechanism object of the invention also aims to optimize the ergonomics of the sitting and lying positions in the armchair (100).

The four bars (1,2, 3, 4) of the mechanism object of the invention are:

- A first bar (1), is a support bar that has a first end (7) located at the front of the seat (100) as the seat (100) is viewed and a second end (8) located at the back of the seat (100),

- a second bar (2): it has one end attached to the first end (7) of the first bar (1) and joins the first end of the first bar (1) with the lower end of the back (5) of the armchair ( 100);

- A third bar (3) has one end attached to the lower end (9) of the back (5) of the armchair (100), and in turn to the end of the second bar (2) which is also attached to the lower end (9) of the back (5) of the armchair (100) and has another end attached to the seat (6) of the armchair (100);

- a fourth bar (4): located by joining the second end (8) of the first bar (1) with the connection point between the third bar (3) and the seat (6) of the armchair (100).

As already explained, attached to the junction point between the second bar (2) and the third bar (3) is attached the lower end (9) of the back (5) of the armchair (100), such that in the Figures the backrest (5) can resemble a linear backrest element (5) between the lower end and the upper end of said backrest (5).

The figures also show the angle formed by the seat with respect to the ground (14), and on the other hand the relative angle between the seat and the back (15) of the armchair (100).

In the mechanism that is the object of the invention, when moving from the sitting to the lying position, the angle of the seat with respect to the ground (14) and the relative angle between the seat and the backrest (15) are progressively and simultaneously increased, so that it is optimized the user's postural comfort in both positions.

This effect is achieved when the seat (6) is linked to the fourth bar (4) of the mechanism and the back (5) to the third bar (3) of the mechanism.

On the other hand, the figures also identify the center of gravity (11), and the instantaneous center of rotation (12), of the set, and the horizontal distance that separates them (13). The mechanism object of the invention, despite the fact that the center of gravity (11) and the instantaneous center of rotation (12) move when the chair passes from sitting to lying position or vice versa, has the technical characteristic that the horizontal distance (13) that separates the center of gravity (11) and the instantaneous center of rotation (12) varies, but said horizontal distance (13) is small, so that the efforts to be made to change the sitting-lying and lying-down position- seated by a user while in the chair (100) or by an auxiliary person from outside, are minimal. The horizontal distance (13) in the preferred embodiment is always less than 10 cm, this data being data that provides an idea of the order of magnitude of the distance.

The mechanism object of the invention keeps the horizontal distance between the center of gravity (11) and the instantaneous center of rotation (12) of the set of four bars (1, 2, 3, 4) limited, so that the torque that you have to win to change position is very small.

In the seated position the center of gravity (11) is slightly advanced with respect to the instantaneous center of rotation (12), while in the lying position the instantaneous center of rotation (12) is slightly advanced with respect to the center of gravity (11).

In the intermediate position between sitting and lying down reflected in figure 3, the horizontal distance (13) that separates the center of gravity (11), and the instantaneous center of rotation (12), of the mechanism object of the invention is zero, it is say the centers are in the same vertical (d = 0).

In the preferred embodiment of the mechanism object of the invention, the dimensions of the different bars (1,2, 3, 4) that make up the mechanism object of the invention are: - first bar (1) measures 700 mm;

- second bar (2) measures 535 mm;

- third bar (3) measures 150 mm; Y

- fourth bar (4) measures 531 mm.

Furthermore, in the preferred embodiment the relative angle between the seat and the backrest (15) both in the sitting position and in the lying position is also defined, said angle (15) has a value of 87 ° in the sitting position and 115 ° in the lying position. In any case, both the length values of the bars and the values of the angle (15) in the two positions are values for the preferred embodiment of the invention that are shown as such, the advantage of the mechanism object of the invention can be obtained with similar but not identical values, therefore, the mentioned values are shown by way of illustrative rather than limiting example.

To lock the mechanism object of the invention in the two extreme positions, that is to say in a sitting position or in a lying position, the mechanism object of the invention comprises a locking positioner (10), as can be seen in figure 4.

Claims (3)

1. Mechanism to move a chair (100) from lying to sitting position and vice versa, where the chair (100) comprises: - a backrest (5) with a lower end (9) and an upper end, and - a seat (6), characterized by comprising: - a first support bar (1), said first bar (1) has a first end (7) and a second end (8), - a second bar (2) joining the first end (7) of the first bar (1) with the lower end of the back (5) of the armchair (100); - a third bar (3), with one end attached to the lower end (9) of the back (5) of the chair (100) and to the end of the second bar (2), and with another end attached to the seat (6) of the armchair (100); Y - a fourth bar (4) joining the second end (8) of the first bar (1) with the end of the third bar (3) connected to the seat (6) of the armchair (100); where the mechanism has a center of gravity (11) that moves in the movement of the bars (1, 2, 3, 4) and an instantaneous center of rotation (12) that also moves in the movement of the bars (1 , 2, 3, 4), such that the horizontal distance (13) between the center of gravity (11) and the instantaneous center of rotation (12) is less than 10 cm. 2. Mechanism to move an armchair (100) from lying to sitting position and vice versa according to claim 1, characterized in that it comprises a locking positioner (10) configured to lock the mechanism in a sitting position or in a lying position. 3. Mechanism to move an armchair (100) from a lying to a sitting position and vice versa according to any of claims 1 to 2, characterized in that the first bar (1) measures 700 mm, the second bar (2) measures 535 mm, the third bar (3) measures 150 mm, and the fourth bar (4) measures 531 mm.