RU225395U1 - Mechanism for transforming furniture with a folding backrest - Google Patents

Abstract

The utility model relates to upholstered transformable furniture with a folding backrest. The mechanism for transforming furniture with a folding backrest has the first and second final states of transformation and consists of a frame, first, second and third sections. Each section is a flat frame with a mesh attached to it, and also contains springs, one end fixed to the frame and the other to the second section. The first section is designed to be in a vertical position, acting as the back of furniture, and horizontal, forming a sleeping place together with other sections. The first section is hinged to the frame so as not to tip over under its own weight. The second section is hingedly connected with one side to the third section, and the other side is connected to the frame, and is configured to perform a rotational movement around the hinge connection with the frame, and contains a protrusion configured to limit the movement of the first section. The third section on one side is hingedly connected to the second section, and on the opposite side it has supports with wheels. The springs are connected to the second section in such a way that in the first final state of transformation, the forces of the springs are aimed at transforming the furniture into the second final state of transformation and vice versa. The technical result is to facilitate the transformation of a sofa with a folding backrest. 6 ill.

Description

The utility model relates to upholstered transformable furniture with a folding backrest and concerns the designs of sofa beds, armchair beds, etc. Typically, such furniture differs from ordinary furniture in that, having a folding back, it increases the amount of space for the user to sit horizontally.

Many mechanisms for transforming furniture with a folding backrest are known from the state of the art. For example, patent document US 20140352057 A1 discloses a module for a seat with a folding backrest. However, this design has the disadvantage that the module seat must be lifted (FIG. 2A) and pulled out (FIG. 2B). These manipulations require the application of sufficient force and reduce the number of people who can unfold such furniture without outside help. Thus, the technical problem solved by the claimed utility model is the possibility of facilitating the transformation of furniture with a folding back, by reducing the user effort required to transform furniture with a folding back.

The technical result is to facilitate the transformation of a sofa with a folding back, by reducing the user's effort required to transform furniture with a folding back.

The technical result is achieved by the fact that the furniture transformation mechanism has the first and second final states of transformation and consists of a frame, first, second and third sections, and also contains springs, one end fixed to the frame, and the other to the second section, the first section made with the ability to be in a vertical position, acting as the back of furniture, and horizontal, forming a sleeping place together with other sections, while the first section is hinged to the frame so as not to tip over under its own weight, and the second section is hinged on one side with the third section, and the other side with the frame, and is made with the ability to perform rotational movement around the hinged connection with the frame, and contains a protrusion made with the ability to limit the movement of the first section, and the third section with one of its sides is hingedly connected to the second section, and on on the opposite side has supports with wheels, while the springs are connected to the second section in such a way that in the first final state of transformation, the forces of the springs are aimed at transforming the furniture into the second final state of transformation and vice versa.

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

fig. 1 - general view of the transformation mechanism when folded;

fig. 2 - general view of the transformation mechanism in the intermediate state;

fig. 3 - general view of the transformation mechanism in the unfolded state;

fig. 4 - side view of the transformation mechanism in a folded state;

fig. 5 is a side view of the transformation mechanism in an intermediate state;

fig. 6 is a side view of the transformation mechanism in the unfolded state.

The positions are designated:

1 - back section;

2 - intermediate section;

3 - seat section;

4 – frame;

5 - protrusion of the intermediate section;

6 - supporting elements with wheels;

7 - additional folding supports;

8 - springs;

9 - intermediate section lever.

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

In this example, the mechanism for transforming furniture with a folding backrest is the mechanism for transforming a sofa with a folding backrest. The transformation mechanism has a first final state of transformation - a folded state, and a second final state - an expanded state.

The transformation mechanism consists of a frame 4 and three sections, namely a back section 1, an intermediate section 2 and a seat section 3. The frame 4 may be a straight parallelepiped consisting of rods welded together, and one of the upper longitudinal ribs may be missing. The frame 4 may also have additional rods connecting the upper and lower ribs. Sections 1-3 can be rectangular flat frames onto which the nets are attached, thereby allowing the user to sit on them. In addition to metal mesh, wood panel materials (MDF, fiberboard, chipboard, plywood, etc.) can also be used. Section 1 can be in a vertical (folded mechanism) or horizontal (unfolded mechanism) position. To do this, section 1 is hinged to the frame 4 in such a way as not to tip over under its own weight, for example, the point of the hinge connection can be located from the lower end of the side side of the section at a distance of one third of the length of the side side of section 1. Section 2 is hinged to the frame 4 and section 3. In essence, section 2 is a crank with a rotation angle of 180 degrees, and section 3 acts as a connecting rod. When the angle of rotation of section 2 is approximately 0 degrees, the mechanism is in the folded state (Fig. 1). When the angle of rotation of section 2 is approximately 180 degrees, the mechanism is in the unfolded state (Fig. 3). On the side of section 2 adjacent to section 1 there is a protrusion 5. Protrusion 5 limits further rotational movement of section 1, thereby aligning sections 1 and section 2. The hinge joint of section 1 with the frame 4 and the hinge joint of section 2 with the frame 4 are located on a given distance for positioning section 2 in the folded position, forming a gap during folding or unfolding (Fig. 2), which is covered by section 1, forming a berth when unfolding (Fig. 3). When folded, section 2 is located under section 3, which forms the seat when folded (Fig. 1).

Section 3 on one side is hingedly connected to section 2, and on the opposite side it has support elements 6 with wheels that allow section 3 to be moved without breaking the connection of the supports with the ground, i.e. without lifting the end of section 3 from the surface. Section 3 on the side adjacent to section 2 may also have additional folding supports 7.

The location of the hinge connection of section 2 with frame 4 is shown in more detail in Fig. 4-6. Section 2 has a lever 9, which is located on the other side of the axis of rotation of the hinge than the rest of section 2. At one end of the lever 9, elastic elements are attached, designed to increase length under load, for example, extension springs 8. At the other end of the spring 8 fixed to the frame 4. In the folded state of the mechanism (Fig. 4), the springs 8 are stretched and pull the lever 9, thereby creating a force to rotate section 2 around the hinge, but such a force is not enough to overcome the weight of the structure (sections 2 and 3 ). It is possible that the weight of sections 2 and 3 is not enough to overcome the force of the springs 8, then the frame 4 and/or section 2 and/or section 3 have locking elements that prevent the movement of section 2 under the force of the springs 8. For example, on the side surface of section 3 there may be a protrusion in the form of a hook can be made, at the same time a rope can be attached to the frame 4 with its ends. In this case, when folded, the rope will hook onto the hook, thereby preventing sections 2 and 3 from moving. It is also possible that if the weight of sections 2 and 3 is insufficient, there are no fixing elements; in this case, section 2 can be rotated at a small angle under the action of springs 8, and the user brings the seat to its final position with his weight.

When unfolding the sofa, springs 8 pull the lever, starting to rotate section 2 around the hinge and move section 3. Due to the support with wheels 6, section 3 moves along the surface, while a significant part of the weight of the mechanism falls on the support. Wheels 6 also reduce the efforts of springs 8 and the user to overcome friction forces. The force of the springs 8 will participate in the unfolding of the mechanism until section 2 rotates approximately 90 degrees, when the springs 8 are completely compressed, after which the springs 8 begin to stretch, counteracting further unfolding. However, with sections 2 and 3 in this position, the user can already use his weight to continue the process of unfolding furniture, pressing section 2 or 3 from top to bottom. In the unfolded state (Fig. 6), the springs 8 are stretched again, therefore, to counteract the reverse movement of sections 2 and 3, locking elements similar to those disclosed above and installed in appropriate places can also be used. When folding the sofa, springs 8 act in a similar way at the second stage of folding (the rotation angle of section 2 is about 90 degrees), the user can also use his weight and press down on section 2 or 3 to bring the mechanism into a folded state.

The force of the springs 8 can be adjusted by selecting the parameters of the springs 8 and/or by the length of the lever 9, and/or by choosing the location of the spring 8 mounts. The force of the springs 8 allows you to compensate for part of the user's efforts at the initial stages of unfolding/folding, when the greatest muscle force is required . Due to the adjustment described above, it is possible to ensure that section 2 is rotated only by the force of springs 8 at an angle of up to 90 degrees.

During transformation, a significant part of the weight of the mechanism falls on the support; the user does not need to lift sections 2 and 3, he only needs to expend effort in turning section 2 from one position to another, using springs 8 at the initial stage of transformation.

Thus, this design facilitates the transformation of furniture with a folding backrest.

The transformation mechanism works as follows.

When folded (Fig. 1), section 1 is in a vertical position, acting as the back of the furniture, section 2 is rotated 0 degrees, thereby section 3 is pushed close to section 1 and forms a seat. To transform furniture with a folding backrest into an unfolded state (Fig. 3), the user applies force to the back of section 3 and/or acts on the locking elements that restrain the force of the springs 8. Next, the user rotates section 2 180 degrees around the hinge connecting the frame 4 with section 2, towards section 3. As a result of this, section 2 and section 3 are on the same level and additional supports 7 are folded out. Due to the displacement of section 2 and section 3 and the fact that the hinge points are at a given distance, between section 2 and section 1 creates a gap. Section 1 is lowered onto protrusion 5 of section 2, thereby closing the gap and being located on the same level as sections 2 and 3. Thus, sections 1, 2 and 3 form a flat base - a berth.

When folded, section 1 rises to a vertical position. Next, to transform furniture with a folding backrest into a folded state (Fig. 1), the user applies force to section 3 and/or acts on the locking elements that restrain the force of the springs 8. Next, the user rotates section 2 180 degrees towards section 1 around the hinge, connecting frame 4 to section 2. Supports 7 are folded simultaneously with the rotation of section 2 and the movement of section 3.

Claims (2)

1. A mechanism for transforming furniture with a folding back, having the first and second final states of transformation and consisting of a frame, first, second and third sections, characterized in that each section is a flat frame with a mesh attached to it, and also contains springs, one end is fixed to the frame, and the other - to the second section, and the first section is made with the ability to be in a vertical position, acting as the back of furniture, and horizontal, forming a sleeping place together with other sections, while the first section is hingedly connected to the frame in this way , so as not to tip over under its own weight, and the second section is hingedly connected with one side to the third section, and the other side is connected to the frame, and is made with the ability to perform a rotational movement around the hinge connection with the frame, and contains a protrusion made with the ability to limit the movement of the first sections, and the third section on one side is hingedly connected to the second section, and on the opposite side has supports with wheels, while the springs are connected to the second section in such a way that in the first final state of transformation, the forces of the springs are aimed at transforming the furniture into the second final state of transformation and vice versa. 2. The transformation mechanism according to claim 1, characterized in that the third section additionally contains folding supports.