WO2016191894A1

WO2016191894A1 - Chair with height-adjustable seat

Info

Publication number: WO2016191894A1
Application number: PCT/CL2016/050028
Authority: WO
Inventors: Marcos Claudio GARCÍA ALVARADO; María José Fernanda VILLANUEVA ADRIAZOLA
Original assignee: Universidad De Los Lagos
Priority date: 2015-06-05
Filing date: 2016-06-02
Publication date: 2016-12-08

Abstract

The present invention relates to the field of furniture and, in particular, provides a chair with a height-adjustable seat. The chair with a height-adjustable seat is characterised in that it comprises: a frame comprising a pair of bars that project in parallel towards the front part of the frame; a seat situated between the pair of bars and which is connected thereto by means of a shaft situated on the rear half of the lower surface of the seat; a pair of clamps that hold the shaft, which are located opposite each other on the bars; a pair of toothed or corrugated scallop-shaped elements located at the opposite lateral ends of the lower surface of the seat and secured thereto, forming identical angles with respect to the lower surface of the seat; and a bar located horizontally between the pair of bars and on which the toothed elements are supported and fastened.

Description

CHAIR WITH ADJUSTABLE HEIGHT SEAT

TECHNICAL FIELD OF THE INVENTION

The present utility model relates to the field of furniture and, in particular, provides a chair with a seat that has adjustable height.

BACKGROUND OF THE INVENTION

Within the educational field, a recurring problem is having adequate furniture to cope with the growth of children in school. A particular problem is represented by the chairs or seats in which the children sit during the school day, because as the growth of the children occurs, the chairs or seats do not adapt to this growth.

One way to solve this problem is by manufacturing and using chairs of different sizes, so that for each child a chair is chosen that is appropriate to its size. However, this solution is far from optimal, since the same chair cannot be used as the child grows and, because each child grows differently, the chair size cannot be standardized according to the age of it.

On the other hand, this disparity of chair sizes included in a given space does not allow them to be stacked neatly and evenly so that the space can be used in other activities.

Within the state of the art chairs and seats have been proposed that solve to some extent the problem of allowing the same chair to be used by a child during the different stages of its growth. Such is the case of patent document GB 7153 of 1913, which describes a chair with adjustable seat with a lower teeth that rests and locks on a crossbar. On the other hand, US 4,240,663 describes a chair whose seat has adjustable height, by sliding along a frame that supports the back of the chair, and is additionally stackable by rotating the seat around an axis . SUMMARY OF THE INVENTION

The present invention provides a chair with adjustable height seat characterized in that it comprises a frame comprising a pair of bars that project parallel to the front of said frame; a seat located between the pair of bars connected to these through an axis that is located in the rear half of the lower surface of said seat; a pair of clamps that support said axis, located on said bars in opposite position with respect to each other; a pair of serrated or wavy elements in the shape of a festoon located and fixed at opposite lateral ends of the lower surface of the seat, forming identical angles with respect to said lower surface of the seat; and a bar located horizontally between the pair of parallel bars, and on which said serrated or undulating elements are supported and locked.

In a preferred embodiment of the model object of the application, the chair with adjustable height seat is characterized in that the axis, by which the parallel bars are connected, is fixed to the lower surface of the seat.

In another preferred embodiment the chair with adjustable height seat is characterized in that said frame additionally comprises a rear support member. In a more preferred embodiment, the chair with adjustable height seat is characterized in that said pair of parallel bars make up two front legs and said rear support member are two legs parallel to each other. In an even more preferred embodiment, the chair with adjustable height seat is characterized in that the separation between the rear legs is greater than the separation between the front legs, which facilitates that the chair with adjustable seat can be stacked with chairs of equal architecture . In a further preferred embodiment of the application model, the chair with adjustable height seat is characterized in that said pair of serrated or corrugated elements and said axis are integrated into a single structure located on the lower surface of the seat.

In another additional preferred embodiment, the chair with adjustable height seat is characterized in that said pair of serrated or corrugated elements, said axis and said seat are integrated in a single structural element. In another preferred embodiment, the chair with adjustable height seat is characterized in that it additionally comprises a backrest located at the top of the frame, and which in a preferred embodiment, forms an integral unit with the rear support member. In a preferred embodiment of the present utility model, the chair with adjustable height seat is characterized in that each of said clamps additionally comprises a quick release type adjustment system.

BRIEF DESCRIPTION OF THE FIGURES Figure 1 shows an embodiment of the chair with adjustable height seat.

Figure 2 shows a second embodiment of the chair with adjustable height seat.

Figure 3 shows the parts that make up the chair with adjustable height seat of the second embodiment. Figure 4 shows a clamp with a quick release type adjustment system.

Figure 5 shows a structure where the pair of serrated or wavy elements and the axis are integrated.

Figure 6 shows an orderly horizontal stacking of chairs with adjustable height seats.

DETAILED DESCRIPTION OF THE INVENTION

The chair with an adjustable height seat that is the subject of this utility model is described below. In general, the position and sides of the chair will be understood in terms of a person who uses it. Thus, the back of the chair is the side where the back of a person sitting on the chair points, the front is the side where this person's chest points, the bottom is the part that is projected towards the feet of this person and the upper part is the part that projects towards the head of this person.

The chair comprises a frame (1) with which the components that give novelty to the present invention interact. This frame (1) comprises a pair of bars (2a and 2b) projecting towards the front of said frame. Said pair of bars (2a and 2b) project in parallel from the upper rear part to the lower front part of the frame, so that the separation between the two remains constant. This pair of bars (2a and 2b) can form two legs, which would be the front legs of the chair, to mention a preferred embodiment of the model, without this affecting the scope of its protection. In another embodiment, it is possible that the frame (1) does not contain legs, as would be the case in which the chair that is the object of protection is constructed in the form of a cantilever or cantilever chair. Similarly, the frame (1) can comprise, without affecting the scope of protection, a rear support member (3). Said frame (1) can also comprise and without affecting the scope of protection, more than one rear support member (3), as is the case with a pair of parallel rear legs (3a and 3b). In the event that the frame (1) contains four legs, two front and two rear (3a and 3b), the chair with adjustable height seat that is the object of protection can be made stackable horizontally if the separation between the legs rear (3a and 3b) is greater than the separation between the front legs so that the latter can occupy the space that is generated between the first (Figure 6), reducing the space required for the storage of these chairs.

However, a specialist in the state of the art will note that the characteristic that the chair is stackable will ultimately depend on the geometric configuration that is pre-established between the front and rear structures of the chair, so that the second fit into the first ones when stacked. In any case, the fact that the chairs are stackable is an additional functionality of the proposed model and does not limit its scope of protection.

The chair additionally comprises a seat (4) that is placed between the bars (2a and 2b). This seat (4) has an axle (5) attached which is located in its rear half, which is the one that connects this seat (4) with the bars that project to the front (2a and 2b). In the embodiment of the model in which the frame (1) comprises two front legs and two rear legs (3a and 3b), this axis (5) allows the seat (4) to be folded down or raised so that the front legs can be inserted inside or between the rear legs (3a and 3b), reducing the space used by the chairs when they are attached (Figure 6). This axis (5) can be located, without affecting the scope of protection, on the lower surface of the seat (4). However, other configurations are also possible, such as an axis (5) that is located on the sides of the seat (4), crossing it from side to side.

This axis (5) is held to the frame (1) by two clamps (6), each located on one of the bars (2a and 2b) that project towards the front of the chair and in opposite positions one with respect to the other. These clamps (6) slide along said bars (2a and 2b), which in turn displaces the shaft (5) and with this the seat (4). In this way, due to the shape of said bars (2a and 2b) with respect to the frame (1), it is possible to adjust the height and depth of the seat (4) with respect to the rear part of the frame (1).

If required, it is possible to equip said clamps (6a and 6b) with a quick release type adjustment system (10a and 10b), similar to the system that allows a bicycle wheel to be attached to the frame thereof, without this It means a limitation of the scope of this model. In this case, the clamps (6a and 6b) are closed reducing the inner radius, tightening each corresponding bar (2a and 2b). Said quick release type adjustment system (10) is composed of a bolt (101), which is what allows the clamp (6) to be closed, which at one end has a manual adjustment nut (102), and in the opposite end with a ring (103) that is crossed by an axis (104) shared with a lever arm (105) with eccentric perforation that rotates on said axis (104). The lever arm (105) on the circular end rests on the ends of the clamp (6), so that with a quick turn it allows to fix the seat (4) in one position. In this way it would be possible to fix said clamps (6a and 6b) to their corresponding bars (2a and 2b) by means of the action of said quick release type adjustment systems (10a and 10b).

In order to fix the position of the seat (4) and to provide greater stability to the chair, two serrated or corrugated elements shaped like a festoon (7a and 7b) are positioned below said seat (4). These serrated or corrugated elements (7a and 7b) are located at opposite side ends of the seat (4) and fixed thereto, and form identical angles with respect to the lower surface of said seat (4). It will be generally understood that these jagged or wavy elements (7a and 7b) have openwork or waves that allow these jagged elements (7a and 7b) to be locked to a bar (9) and thereby support said jagged or wavy elements (7a and 7b), and all the elements fixed to the seat (4) in said bar (9).

The serrated or wavy elements (7a and 7b) rest on the bar (9) that is placed horizontally between the bars (2a and 2b) that project towards the front of the frame (1), setting the height and depth of the seat (4). This support gives stability to the chair, avoiding an unwanted mismatch of the height and depth of the seat (4).

Optionally, without this affecting the scope of protection of this model, it is possible to integrate both toothed or corrugated elements (7a and 7b) and axis (5) into a single structure (1), and fix this one structure (1 1) to the lower surface of the seat (4) by suitable means. In this way, this structure (1 1) is located on the lower surface of the seat (4). This optional feature has the advantage that it integrates in a single structure (1 1) the elements that give stability to the chair, in particular the seat (4), with those that give part of the technical advantages of the model, in particular the shaft (5) and the serrated or wavy elements (7a and 7b). Another option is to integrate both the toothed or corrugated elements (7a and 7b), as well as the shaft (5) and the seat (4) into a single structural element constructed for this purpose, which could be built, for example and without this limit the scope of protection, by 3D printing. Optionally also, without affecting the scope of protection, it is possible to include a backrest (8) on the top of the frame (1), which gives greater comfort to the person who makes use of the chair.

Based on the above, if it is desired to adjust the height of the seat (4), said seat (4) must be rotated with respect to the axis (5), in order to disengage the toothed elements (7a and 7b) of the horizontal bar (9), then move said seat (4) with respect to the frame (1), sliding the clamps (6a and 6b) along the bars (2a and 2b) projecting towards the front of said frame (1 ), to the desired position, then return the seat (4) to its predominantly horizontal position, fixing its height by supporting the toothed elements (7a and 7b) on the horizontal bar (9) in a second position.

By means of the embodiment described here it is possible to obtain a chair with adjustable height and depth seat, which is suitable, in particular, for use by school-age children, since it adapts to the growth of each child, as well as for be able to achieve their orderly stacking (Figure 6) in the area where they are placed, when this is required.

Claims

one . A chair with adjustable height seat, CHARACTERIZED because it comprises:

- a frame (1) comprising a pair of bars (2a and 2b) that project parallel to the front of said frame (1);

- a seat (4) located between the pair of bars (2a and 2b) connected to them through an axis (5) that is located in the rear half of the lower surface of said seat (4);

- a pair of clamps (6a and 6b) holding said axis (5), located on said bars (2a and 2b) in opposite position with respect to each other;

- a pair of serrated or wavy elements in the form of a festoon (7a and 7b) located and fixed at opposite lateral ends of the lower surface of the seat (4), forming identical angles with respect to said lower surface of the seat (4); and - a bar (9) located horizontally between the pair of bars (2a and 2b) and on which said serrated or corrugated elements (7a and 7b) are supported and locked.

2. The chair with adjustable height seat of claim 1, CHARACTERIZED in that said axis (5) is fixed to the lower surface of the seat (4).

3. The chair with adjustable height seat of claim 1, CHARACTERIZED in that said pair of serrated or corrugated elements (7a and 7b) and said axis (5) are integrated in a single structure (1 1) located on the lower surface of the seat (4).

4. The chair with adjustable height seat of claim 1, CHARACTERIZED in that said pair of serrated or corrugated elements (7a and 7b), said axis (5) and said seat (4) are integrated into a single structural element.

5. The chair with adjustable height seat of claim 1, CHARACTERIZED in that said frame (1) additionally comprises a rear support member (3).

6. The chair with adjustable height seat of claim 5, CHARACTERIZED in that said pair of bars (2a and 2b) comprise two parallel front legs and said rear support member (3) are two legs parallel to each other (3a and 3b).

7. The chair with adjustable height seat of claim 6, CHARACTERIZED in that the separation between the rear legs (3a and 3b) is greater than the separation between the front legs.

8. The chair with adjustable height seat of claim 1, CHARACTERIZED in that it additionally comprises a backrest (8) located at the top of the frame (1).

9. The chair with adjustable height seat of claim 1, CHARACTERIZED in that each of said clamps (6a and 6b) additionally comprises a quick release type adjustment system (1 Oa and 10b).