CN108289548A - Improved self-adjusting backrest device - Google Patents

Abstract

The invention relates to a self-adjusting backrest device formed by a movable plate pivoting about a horizontal axis (3), the plate and the axis being connected together by a first set of hubs. The axis is also connected to a second set of hubs which in turn are associated with a support member which may be the backrest of an existing chair or a backrest forming part of the device.

Description

Improved self-adjusting backrest device

technical field

The invention relates to a self-adjusting backrest arrangement with automatic position adjustment for user comfort. It can be used in all types of seating: chairs, sofas, easy chairs, wheelchairs, car seats, etc., and can even be used as a separate element placed on the floor.

Background technique

For manufacturing vehicles, offices or any other type of seat, more or less complex systems are applied to adapt the backrest to the position of the user.

So, for example, patent ES2118081T3 relates to a chair comprising a seat and a backrest connected to each other, characterized in that the backrest has a certain movement associated with two horizontal axes, it rotates on one horizontal axis and the other constrains it exercise.

Patent US2005035636A1 discloses a type of chair comprising a seat and a backrest connected to each other, the chair is self-adjustable, characterized in that it comprises a backrest formed by a back support plate, the backrest is provided on a support supported by a horizontal axis joint at a distance from the bottom of the backrest, preferably in the area of the average height of the backrest, and having a rotational spring damped and limited by a rotation limiting system, and when the plate is in the rest position, the rotation The spring is generally in a vertical position. Plates, supports and joints are contained in a semi-rigid enclosure.

None of the cited patents provide lumbar support.

Patent WO9427472A1 describes a chair comprising a seat and a back connected to each other, characterized by comprising a back/back support plate supported by a horizontal axis joint.

Patent number ES2255466A1 relates to a self-adjusting chair characterized in that it consists of a continuous single piece used as backrest and seat and supported by joints.

Patent US6435615B1 discloses a chair comprising a seat and a backrest connected to each other, characterized in that the backrest is supported by a horizontal shaft joint.

Patent DE20113075U1 relates to a chair comprising a seat and a backrest, characterized in that the backrest comprises an arm with two axes, the lower one linking the backrest to the seat and the other lower axis adjusting the user to rest on it position of the board.

None of these patents refer to a separate back that can be attached to a different chair, easy chair or any other type of seating.

Patent US2005168044A1 describes a seat back with a lower extension adapted to be pushed into the ground (eg at a beach) and used as a backrest for a user sitting on the ground.

Patent WO0117398A1 discloses a self-adjusting seat supported on the ground by an adjustment system that does not include a horizontal axis.

None of the cited patents deal with a free-standing backrest suitable for mounting on any type of chair, easy chair, armchair, or even on the floor itself to protect the lumbar area, regardless of the user's posture, and Lift the buttocks and release the pressure on them.

Contents of the invention

The invention relates to a self-adjusting backrest arrangement which protects the lumbar region and relieves pressure on the buttocks.

The backrest is self-adjusting, which means it requires no controls or commands.

The mentioned device complements the seat surface so that it was previously present, and the object of the invention covers that it adds a backrest or improves an existing backrest.

The self-adjusting backrest assembly includes a movable plate against which the user rests, wherein the plate rotates on a horizontal axis passing through a first set of hubs connected to the plate, the shaft being connected to a second set of hubs connected to the support. Two sets of hubs are associated, this support may be the back itself of the chair or easy chair for which the self-adjusting back is to be used, in which case it will be referred to as a pre-existing back, or it may form part of the device The fixed backrest, in which case it will be called the device's backrest.

At least one set of hubs is adjustable in height, so that a change in height of the first set of hubs will change the relative point on which the plate rotates, changing the rod, while a change in height of the second set of hubs will change the height at the point where the plate sits .

Hub refers here to any element that acts as a support for the shaft allowing it to rotate.

The backrest of the device can be of different sizes based on (among other things) the surface it is supposed to be supported on.

The plate has an initial position with no force exerted by the user or at his or her will, and can be limited to balanced operation by a maximum position and a minimum position.

The ideal initial or rest position is preferably close to a vertical line, but this may vary depending on the pre-existing angle of the backrest or the support on which the backrest of the device rests.

This rest position is obtained due to the action of a rotary spring in which the plate is in a substantially vertical position, wherein said rotary spring can be damped for user comfort.

When not in use, the board is forced into a rest position by a rotating spring that is able to overcome the weight of the board and bring it to the initial position and hold it there, but allows it to be under the pressure exerted by the user while sitting Yields without making the user feel the pop force.

Optionally, the operation of the board can be limited.

Preferably the assembly of the moving plate, first and second sets of hubs, shaft and support will be contained in a semi-rigid housing so that the user cannot see these mechanical elements and reduces the risk of pinching.

According to the above, the lower part of the plate may comprise elastic elements closing the space between the plate and the seat surface, reducing the risk of pinching objects or parts of the user's body that may be inserted therein. This elastic element usually connects the seat surface to the board and can be made of a rubber fabric which can also help the board return to a vertical position, whereby two benefits can be achieved with a single element.

The assembly comprising the plate, first and second sets of hubs, axle and support is suitable for association with a chair, easy chair or sofa etc., which may include more complex car seats.

Once the self-adjusting backrest arrangement is installed, the user will sit on the generally horizontal, pre-existing seat surface and support their back on the self-adjusting backrest arrangement.

Preferably, the shaft is adjustable in height and will be arranged between 12 and 33 centimeters above the user's seat surface, and preferably between 18 and 27 centimeters.

In cases where the self-adjusting backrest is not supported for its position on the pre-existing backrest of the chair or easy chair, the self-adjusting backrest may contain various accessory elements to keep it fixed and prevent it from moving under the weight of the user.

Thus, for example, in one possible embodiment, the device may comprise suitable stakes to dig into soft ground, such as mud or sand.

Another possible embodiment could include non-slip legs to secure it to slippery surfaces.

In a third embodiment, the device may comprise fins, with which the user fixes the support with his or her own body weight, when for example the user wants to lie in bed and read and lean on the device. will be useful.

The seating device may have armrests or any other element without changing the nature of the invention. Also, the panels may have curvature, cushioning, flexibility, rigidity or any other measure to increase user comfort.

In the end, the material will be wood, plywood, plastic, metal, fabric, wicker or any other material.

The plate can be detached from the shaft to facilitate tasks such as cleaning, repairs or adjustments.

Description of drawings

For a better understanding of the present invention, the following figures are included.

Figure 1 shows an embodiment of the invention using the backrest of the chair itself, where the device acts as a fixed backrest, and thus we find the moving plate (1), the first set of hubs ( 2), the shaft (3) and the second set of hubs (4) connected to the support, in this case the pre-existing backrest (5). Also shown is the seating surface (10), in this case a chair.

Figure 2 shows diagrammatically an adjustable backrest arrangement comprising a fixed backrest ready in this case to rest on the backrest of an armchair, with a mobile plate (1), a first set of hubs ( 2), the shaft (3), the second set of hubs (4) and the backrest (6) of the device.

Figure 3 shows an embodiment in which the backrest (6) of the device having a triangular cross-section incorporates stakes (7) for anchoring the backrest to a soft and penetrable ground such as earth or sand.

Figure 4 shows an embodiment in which the backrest (6) of the device incorporates a base (8) adapted to secure the device to a smooth floor.

Figure 5 shows an embodiment in which the backrest of the device comprises a flap (9) between the seat surface (10) (in this case the floor) and the user, so that in this way the user moves with him or Her own weight prevents the device from moving.

Detailed ways

One embodiment of the present invention is briefly described below, by way of example and without limiting its scope.

The self-adjusting backrest that is added to the seat surface includes:

A mobile plate (1) of sufficient size to cover the user's back from the coccyx to the shoulder blade area.

A horizontal shaft (3) on which the said moving plate rotates, said shaft being supported by a first set of hubs (2) connected to the moving plate and a second set of hubs (4) connected to the backrest (6) of said device .

A rotary spring, which holds the plate in a substantially vertical position when it is in its rest position, ie when no external force is acting on it.

The device rests on a seating surface (10), such as a bed or floor.

A height-adjustable first set of hubs (2) is attached to the mobile plate. When changing the relative height of the first set of hubs relative to the plate, and thus the relative height of the shaft relative to the plate, the point on which the plate turns is changed, changing the torque exerted by the plate.

The shaft (3) is also associated with a second set of hubs (4) connected to the backrest (6) of the device.

In this embodiment, the second set of hubs is also height adjustable, and by changing their height, the height of the plate and shaft is changed relative to the seat surface.

The axis on which the plate rotates is located at a height of 23 cm, the normal height from the seat surface is between 12 and 33 cm, and preferably between 18 and 27 cm.

The action of the first set of hubs and the second set of hubs and their associated horizontal axes allows the mobile plate to rotate on the backrest of the device such that the more force the user exerts on the upper part of the mobile plate, the greater the effect on the lumbar region. The bigger it is, the less pressure the hips have to be lifted.

In the illustrated embodiment, in order to prevent movement of the self-adjusting backrest assembly due to the horizontal force exerted by the user while leaning on it, it includes fins, through the frame on which the user sits, by him or Her weight prevents the components from moving.

Claims (as amended under Article 19 of the Treaty)

1. A type of self-adjusting backrest device that complements the seat surface, characterized in that said self-adjusting backrest device comprises a moving plate (1); a first set of hubs (2) connected to said moving plate; said a horizontal shaft (3) on which the plate rotates; and a second set of hubs (4) associated with said horizontal shaft on the one hand and connected by any means to a support, which may be the The backrest of the chair or easy chair on which the self-adjusting backrest is to be used is referred to per se and refers to a pre-existing backrest, or a fixed backrest which may be part of the device, in which case the support means What is claimed is the backrest of said device, wherein the distance of said axle from said seat surface (10) is between 12 and 33 centimeters, preferably between 18 and 27 centimeters.

2. The self-adjusting backrest arrangement according to claim 1, characterized in that said self-adjusting backrest arrangement further comprises a rotational spring associated with said plate and said horizontal axis, forcing their relative position, In the rest position of the rotary spring, which is preferably a damped rotary spring, the plate is in a substantially vertical position.

3. The self-adjusting backrest device of claim 1, wherein travel of the shaft is limited by a stop.

4. The self-adjusting backrest assembly of claim 1 , wherein the assembly comprising the moving plate, the first set of hubs, the second set of hubs, and the support is contained within a semi-rigid housing middle.

5. The self-adjusting backrest arrangement of claim 1, wherein the lower portion of the plate has a resilient element that closes the space between the plate and the seat surface.

6. Self-adjusting backrest device according to claim 1, characterized in that the support is the backrest (6) of the device and is fixed.

7. Self-adjusting backrest device according to claim 1, characterized in that the backrest (6) of the device has studs (7).

8. Self-adjusting backrest device according to claim 1, characterized in that the backrest (6) of the device has fins (9).

9. The self-adjusting backrest device of claim 1, wherein the connection of the first set of hubs to the plate includes motion guides, the position of the first set of hubs relative to the plate being adjustable of.

10. The self-adjusting backrest assembly of claim 1, wherein the connection of the second set of hubs to the support comprises motion guides, the position of the second set of hubs relative to the plate being adjustable adjusted.

11. The self-adjusting backrest arrangement of claim 1, wherein the self-adjusting backrest arrangement has more than one plate.

Claims (10)

1. a type of self-adjusting back-rest means for chair supplements seat surface, which is characterized in that including movable plate (1)；It is connected to First group of wheel hub (2) of the movable plate；The trunnion axis (3) of the plate rotate on it；With one side and the trunnion axis phase Association and on the other hand second group of wheel hub (4) associated with support element, wherein seat surface (10) described in the wheelbase Distance is between 12 and 33 centimetres, preferably between 18 and 27 centimetres.

2. self-adjusting back-rest means for chair according to claim 1, which is characterized in that further include torsional spring, in the rotation The resting position of spring, the plate are in general vertical location, and the torsional spring preferably buffers torsional spring.

3. self-adjusting back-rest means for chair according to claim 1, which is characterized in that the movement of the movable plate has limitation.

4. self-adjusting back-rest means for chair according to claim 1, which is characterized in that including the movable plate, first group described The component of wheel hub, second group of wheel hub and the support element is comprised in semi-rigid outer shell.

5. self-adjusting back-rest means for chair according to claim 1, which is characterized in that the lower part of the plate has elastic element, The elastic element closes the space between the plate and the seat surface.

6. self-adjusting back-rest means for chair according to claim 1, which is characterized in that the support element is the backrest of described device (6) it and is fixed.

7. self-adjusting back-rest means for chair according to claim 1, which is characterized in that the backrest (6) of described device has stake (7)。

8. self-adjusting back-rest means for chair according to claim 1, which is characterized in that the backrest (6) of described device has fin (9)。

9. self-adjusting back-rest means for chair according to claim 1, which is characterized in that the height of at least one set of wheel hub is adjustable 's.

10. self-adjusting back-rest means for chair according to claim 1, which is characterized in that the self-adjusting back-rest means for chair has more In one plate.