RU229335U1 - Sofa with a folding back - Google Patents

Abstract

The utility model relates to transformable furniture with a folding back, mainly concerns the designs of sofa beds. A sofa with a folding back includes a fixed rectangular base made in the form of vertical front, rear and two side posts fastened to each other, and two rectangular frames. The first frame is made rotatable with the ability to be in a vertical position, acting as the back of the sofa, and in a horizontal position, forming a sleeping place together with the second frame. The first frame is hingedly connected to the base in such a way that in the vertical position it rests against the rear vertical post of the base and does not tip over backwards under its own weight. The second frame is made horizontal and is located above the upper ends of the side posts of the rectangular base, has a front vertical support post and is made with the ability to move horizontally along the rectangular base. The fixed rectangular base includes a rectangular transverse rib fixed on the front and rear vertical posts and located parallel to the direction of movement of the second frame. The second frame also includes a rectangular transverse rib, which is located above the rectangular transverse rib of the fixed rectangular base. A guide is fixed on the rectangular transverse rib of the second frame, the lower walls of which hold the transverse rib of the second frame above the rectangular transverse rib of the base, placing them above each other at a distance of 2-20 mm, and on the outside, on the front vertical post of the base, a V-shaped guide is fixed, supporting the rectangular transverse rib of the second frame. The technical result is to increase the reliability of the sofa unfolding mechanism. 5 clauses, 5 figs.

Description

The utility model relates to transformable furniture with a folding back, mainly concerns the construction of sofa beds. Usually, such furniture differs from the usual one in that, having a folding back, it increases the amount of space for the horizontal position of the user.

A sofa bed of the "Eurobook" type is known from the prior art (see Russian Federation Patent No. 2613741 of 21.03.2017). This sofa includes a fixed rectangular base made in the form of front and rear vertical posts and two vertical side posts and two rectangular frames, while

the first frame is made to rotate with the ability to be in a vertical position, acting as the back of a sofa, and horizontal, forming a sleeping place together with the other frame, wherein the first frame is hingedly connected to the base in such a way that in the vertical position it rests against the rear vertical post of the base and does not tip backwards under its own weight and the weight of the user when sitting,

the second frame, made horizontal and located on the upper horizontal edges of the rectangular base, has a front vertical support post and is designed with the possibility of sliding along the rectangular base.

The disadvantage of the above solution is its lack of reliability due to the use of rollers, by means of which the second frame is extended. Thus, when applying an increased load to one or more rollers, it may become skewed or even break. The proposed solution allows to eliminate such breakdowns, as well as significantly simplify the mechanism of unfolding the sofa.

The technical result is an increase in the reliability of the sofa unfolding mechanism.

The technical result is achieved by the fact that the sofa with a folding back includes a fixed rectangular base, made in the form of vertical front, back and two side posts, fastened to each other, and two rectangular frames. In this case:

the first frame is made rotatable with the ability to be in a vertical position, acting as the back of a sofa, and horizontal, forming a sleeping place together with the other frame, wherein the first frame is pivotally connected to the base in such a way that in the vertical position it rests against the rear vertical post of the base and does not tip backwards under its own weight and the weight of the user when sitting,

the second frame, made horizontal and located on the upper horizontal edges of the rectangular base, has a front vertical support post and is designed with the possibility of horizontal movement along the rectangular base.

The main difference of the proposed sofa is that the fixed rectangular base includes a rectangular transverse rib fixed on the front and rear vertical posts and is located parallel to the direction of movement of the second frame, and the second frame also includes a rectangular transverse rib, which is located above the rectangular transverse rib of the fixed rectangular base. At the same time, a guide is fixed on the rectangular transverse rib of the second frame, the lower projections of which hold the transverse rib of the second frame above the rectangular transverse rib of the base, while placing them above each other at a distance of 2-20 mm. Also on the outside, on the front vertical post of the base, a U-shaped guide is fixed, supporting the rectangular transverse rib of the second frame.

In addition, it is preferable that a limiter of horizontal movement of the second eye be fixed on one or both sides of the rectangular transverse edge of the base. In this case, it is desirable to regulate the depth of extension of the second frame, for this purpose, horizontal holes are made in the rectangular transverse edge of the base for fixing the limiter of horizontal movement of the second frame in different positions.

The first and second frames should preferably contain transverse slats.

The first frame may also include a rectangular cross rib that is located above the rectangular cross rib of the fixed rectangular base when rotated to a horizontal position.

The support post of the second frame on the inside should preferably contain a lock that prevents the second frame and its support post from accidentally extending.

The essence of the technical solution is explained in Fig. 1-6, where

Fig. 1 – general view of the sofa with a folding back in the folded state;

Fig. 2 – general view of a sofa with a folding back with the second frame extended;

Fig. 3 – general view of a sofa with a folding back with the second frame extended, showing the guide by which the second frame is moved;

Fig. 4 – general view of the sofa with a folding back in the unfolded state, where the lock is shown;

Fig. 5 shows a general view of a sofa with a folding back in the unfolded state, where a V-shaped guide supporting the rectangular cross rib of the second frame is shown.

The positions are designated:

1 – front vertical base post;

2 – rear vertical base post;

3 – side vertical base posts;

4 – first frame;

5 – second frame;

6 – front vertical support post of the second frame;

7 – rectangular transverse base rib;

8 – rectangular cross rib of the first frame;

9 – rectangular cross rib of the second frame;

10 – hinged connection of the first frame with the base;

11 – guide;

12 – limiter of horizontal movement of the second eye;

13 – second eye movement lock;

14 – V-shaped guide.

Below is an example of the implementation of the utility model.

This example shows an example of transformation of a sofa with a folding back. The proposed sofa with a folding back has a first final state - a folded state (Fig. 1) and a second final state - an unfolded state (Fig. 4, 5).

A sofa with a folding back (Fig. 2) consists of a fixed rectangular base made of the following, fastened together: a front pillar 1, two side pillars 3 and a rear pillar 2, as well as a first frame 4 and a second frame 5. In this case, a rectangular transverse rib 7 (Fig. 2) is made in the upper part of the base, which is fixed to the front 1 and rear 2 pillars of the base.

The first frame 4 is secured to the side posts 3 of the fixed base by means of two hinged joints 10, in such a way as to be able to be located:

in a vertical position, acting as the back of a sofa, resting against the rear vertical support 2 of the base and not tipping back under its own weight;

in a horizontal position, forming together with the second frame 5 a sleeping place (Fig. 4, 5).

Also, the first frame 4, if necessary, includes a rectangular transverse rib 8, made to correspond to the rectangular transverse rib 7 (for small dimensions of the sofa, the rectangular transverse rib 8 may be absent).

The first frame 4 in a horizontal position (in the unfolded state) rests on the upper end part of the base, namely on the upper ends of the side posts 3, and its rectangular transverse rib 8 (if present) rests on the rectangular transverse rib 7 of the base.

The second frame 5 is always in a horizontal position and is located above the end part of the base, namely above the upper ends of the side posts 3, and in its front part a vertical support post 6 is fixed, which rests on the floor.

The second frame 5 includes a rectangular transverse rib 9, made and located above the rectangular transverse rib 7 of the base. In this case, on the rectangular transverse rib 9 of the second frame 5, a guide 11 is fixedly fixed, made of two halves (Fig. 3). This guide 11 is preferably fixed tightly to the rear rib of the second frame 5. The guide 11 is made in such a way that its upper part encircles the rectangular transverse rib 9 of the second frame 5, and the lower part on both sides limits any lateral displacement of the rectangular transverse rib 9 relative to the rectangular transverse rib 7 of the base. The lower wall of the guide 11 is made 2-20 mm thick so that when it moves (the sofa moves to the unfolded state), it slides along the rectangular transverse rib 7 of the base, and the side ribs of the second frame 5 slide along the corresponding ends of the side ribs 3 of the base. The thickness of the lower wall of the guide 2-20 mm, as well as its other walls, is selected based on the possibilities of manufacturing the guide 11, so with a wall thickness of less than 2 mm, its wear will be more frequent, and with an increase of more than 20 mm, the guide turns out to be more bulky.

Also on the front vertical post of the base 1 on its outer side a v-shaped guide 14 is fixed (Fig. 5). This v-shaped guide 14 protrudes above the post and is made in such a way as to support the rectangular transverse rib 9 of the second frame in a horizontal position. Also, when the second frame 5 moves (the transition of the sofa to the unfolded state), the rectangular transverse rib 9 slides along the v-shaped guide.

Guide 11 and V-shaped guide 14 are made of wear-resistant materials, such as plastic, and they are made easy to replace when they wear out.

In addition, a limiter 12 of horizontal movement of the second frame can be located on the rectangular transverse rib 7. The limiter 12 is a plastic cylinder (attached with a screw and nut) and prevents excessive movement of the second frame. The position of the limiter can be changed by fixing it in the corresponding holes in the rectangular transverse rib 7, thereby adjusting the size of the sleeping area formed by the extension of the second frame 5.

The front vertical support post of the second frame 6 on the inside may contain a second frame movement lock 13 (Fig. 4), which, when force is applied, snaps into place on the front vertical post of the base 1 and limits the movement of the second frame 5. When unfolding the sofa, force must be applied to unfasten the second frame movement lock 13 from the front vertical post of the base 1 and move the second frame 5 to the limiter 12.

The first and second frames 4.5 can contain transverse slats for placing the corresponding pillows and mattress on them, or be upholstered with soft elements of the sofa.

The proposed sofa with a folding backrest is unfolded as follows.

The user moves the second frame 5 together with the front vertical support post 6 (it is desirable to have legs or wheels for convenience) by any protruding part of the second frame 5 (the sofa design or upholstery may have corresponding elements for this purpose). First, he opens the second frame movement lock 13 by slightly upward and toward himself and moves the second frame 5. After which the lower wall of the guide 11 slides along the rectangular transverse edge of the base 7 and, at the same time, the rectangular transverse edge of the second frame 9 slides in the recess of the V-shaped guide 14. The movement of the second frame 5 stops as soon as the guide 11 rests against the horizontal movement limiter of the second frame 12. Ultimately, the user will only have to lower the first frame 4 onto the base, and the sofa goes into the second final state - the unfolded state.

The proposed sofa with a folding backrest is folded in the reverse order, while the first frame 4 can also be fixed in the open (vertical) position.

Claims (6)

1. A sofa with a folding backrest, including a fixed rectangular base made in the form of vertical front, rear and two side posts fastened to each other, and two rectangular frames, wherein the first frame is made rotatable with the ability to be in a vertical position, acting as the back of the sofa, and in a horizontal position, forming a sleeping place together with the second frame, wherein the first frame is pivotally connected to the base in such a way that in the vertical position it rests against the rear vertical post of the base and does not tip over backwards under its own weight, and the second frame is made horizontal and is located above the upper ends of the side posts of the rectangular base, has a front vertical support post and is made with the ability to move horizontally along the rectangular base, characterized in that the fixed rectangular base includes a rectangular transverse rib fixed to the front and rear vertical posts and located parallel to the direction of movement of the second frame, the second the frame also includes a rectangular transverse rib, which is located above the rectangular transverse rib of the fixed rectangular base, wherein a guide is fixed on the rectangular transverse rib of the second frame, the lower walls of which hold the transverse rib of the second frame above the rectangular transverse rib of the base, while placing them above each other at a distance of 2-20 mm, and on the outside, on the front vertical post of the base, a V-shaped guide is fixed, supporting the rectangular transverse rib of the second frame. 2. A sofa according to item 1, characterized in that a limiter for horizontal movement of the second frame is fixed to one or both side faces of the rectangular transverse rib of the base. 3. A sofa according to item 2, characterized in that horizontal holes are made in the rectangular transverse edge of the base for securing the limiter of horizontal movement of the second frame. 4. A sofa according to item 1, characterized in that the first and second frames contain transverse slats. 5. A sofa according to claim 1, characterized in that the first frame also includes a rectangular transverse rib, which is located above the rectangular transverse rib of the fixed rectangular base, when rotated to a horizontal position. 6. A sofa according to item 1, characterized in that the support post of the second frame on the inside contains a second frame movement lock.