RU2448631C2 - Mechanical device for opening and closing sofa bed - Google Patents

Abstract

FIELD: personal use articles.

SUBSTANCE: invention relates to a mechanical device for opening and closing sofa beds. A mechanical device for opening and closing sofa beds consists of a frame structure and a set of movable frames connected in series with each other and moved through roto-traversing, containing a first articulated quadrilateral (A) and the second articulated quadrilateral (B) interconnected and operated by the specified displacement. The number of connecting rods in the quadrangle (A) is not more than three, and the number of connecting rods in the quadrangle (B) is not more than two.

EFFECT: reduction of parts of the mechanism and lack of possibility of accidental folding of a sofa bed.

10 cl, 13 dwg

Description

A mechanical device for opening and closing sofa beds forms the subject of the present invention.

Typically, sofa beds consist of a fixed structure and many movable frames that are connected in series with each other. These frames can be moved by means of rotationally rectilinear movements from the so-called “closed position”, to which they are folded in the proper order and are essentially within the volume formed by the fixed structure, to the so-called “open” position, according to which the movable frames are combined with the other, outside the specified volume, and determine the surface for rest. This movement becomes possible by means of one or more kinematic mechanisms located between said stationary structure and frames. Numerous examples of such devices are known in the art. To date, almost all of them allow opening and closing operations in a single movement without having to remove the sofa cushions before performing these operations. Despite technological progress, known devices still have several drawbacks. First, these devices are complex and require a large number of levers and articulated joints. In addition, they do not exclude the possibility of accidental closure. In fact, in cases where, when the sofa is in the open position, the user sits near the articulation point between two adjacent frames, the bed itself may accidentally close.

Novelty is the subject of the present invention solves the above problems, since it considers a mechanical device for opening and closing sofa beds, comprising a frame structure and a plurality of movable frames connected in series with each other and moved by means of rotationally rectilinear movements; in addition, such a device contains at least one first articulated quadrangle (A) and at least one second articulated quadrangle (B), interconnected and driven by the specified movement, and characterized in that the number of connecting rods in a quadrangle (A) no more than three, and the number of connecting rods in a quadrangle (B) no more than two.

According to another object, the opening is equipped with a folding assembly (K) that prevents accidental closure of the structure in the open position if it is overloaded, with concentrated or distributed load.

These and other advantages will become more apparent from the detailed description of the invention, which has specific references, which presents a diagram of a preferred implementation, which is fully illustrative and unlimited.

In particular:

- Figure 1 shows the structure of the device with all its main components in accordance with the configuration, which allows the opening of the sofa bed;

- FIGS. 2a, 2b and 2c show three innovative components of a mechanical device, i.e. quadrangles (A) and (B) and a mechanical stopper (K);

- Figure 3 shows a quadrangle C;

- On figa - e schematically shows the functioning of the mechanical stopper;

- Figa and 5b shows the device in configurations according to which they reach the intermediate position and the closed position of the sofa bed, respectively;

- Figure 6 presents the second implementation of the device.

With reference to the above drawings and, in particular, in FIG. 1, the structure of the device consists of a quadrangle A including connecting rods (1, 2, 3), quadrangle B including connecting rods (4, 5), a quadrangle C, which includes connecting rods (17, 18), and a mechanical stopper K. This device also includes a tube (7) of the front frame and a plate (6) fixed to the specified tube, a tube (9) of the central frame and a hinge assembly (8) between said front frame tube and lower frame tube (15) the return rod (10) of the specified tube of the lower frame, the fixed plate (11), the hinge assembly between the tube of the central frame and the tube of the lower frame (12), the first return rod (13) of the specified tube of the lower frame and the lower support, the second return rod (14 ) of the specified tube of the lower frame and lower support, the traction of the lower support (16) and the support of the rear frame, shaped base (19), rear frame (20), support base (21) of the quadrangles A, B and mechanical stopper K, the first return spring ( 22) between the connecting rod (3) and the hinge assembly (8) and the second return spring between from the connecting rod (3) and connecting rod (4).

The mechanical device according to the present invention and thanks to a series of connecting rods and hinge assemblies allows the installation of the frame structure in two configurations - these open and closed configurations. In a closed configuration, the frame structure can be inserted into the sofa and serve as a support when sitting; in an open configuration, it also serves as a support for a bed mattress of considerable height (equal to 14 cm). The change between these two positions is achieved by a single movement, without the need to remove the lower and rear cushions.

The novelty of the discovery lies in kinematics, which allows movement on the hinges of the device itself. In fact, in order to realize two configurations, open and closed, only three connecting rods (1, 2 and 3) in quadrangle A (Fig. 2a) and only two connecting rods (4, 5) in quadrilateral (B) are used (Fig. .2b) in the presence of only one active degree of freedom. Quadrangle A, in addition to the three mentioned rods, includes a fourth side formed by a part of the support base (21) enclosed between the connecting points (1 ') and (2'), while quadrangle B, in addition to two single rods (4) and (5), includes a part of the frame (6) enclosed between the nodal joints (4``) and (5 ') and a part of the support base (21) enclosed between the nodal joints (5' ') and (four').

A further innovative characteristic of opening is the mechanical stopper K (Fig. 2c), which protects against folding, which prevents the frame structure in the open position from accidentally closing under excessive load under concentrated or distributed load conditions. When considering Fig.4, where initially (Fig.4a) the entire structure of the sofa is presented in an open configuration, it is clear that at first (Fig.4b) the system is schematically depicted in the equilibrium position and the sleeping surface is horizontal; if the force F is applied to the free end (purposefully, namely to close the sofa bed), the rod (4) of the quadrangle B rotates around a fixed point α in the counterclockwise direction and moves forward from the stopper (K), ensuring the sofa bed is closed; if, on the other hand, a force of weight P is applied from above onto the sleeping surface (Fig. 4e), the rod (4) rotates around a fixed point α in a clockwise direction until it is stopped by the stopper (K); thus, accidental closure of the sofa bed is prevented. Conversely, when optimizing the size and location of the rod (5) and applying the same weight force P from above to the sleeping surface (Fig. 4f), the same rod (5) rotates an angle β in the counterclockwise direction, reaching equilibrium in the vertical position when minimum energy costs. Therefore, according to this decision, the stopper K is no longer necessary, since the same effect is achieved with the exception of accidental closures.

Finally, the pillow removal system, achieved with only two rods (17), (18), is also innovative. The quadrangle C is formed by means of a rod (14) and a part of the frame (15) enclosed between the connecting nodes (14 '') and (17 '). In particular, the rod (18) rotates at the same point (18 '), in which the rod (14) and the lower support (16) are also pivotally mounted, thereby reducing by one unit the number of axes necessary for the kinematics of the quadrangle C. According to An alternative implementation is the ability to remove the base frame (21), replacing it with a more practical side element (25). This is achieved by combining the connecting point (4 ') with two other stationary restrictive elements (1') and (2 ').

Claims (10)

1. A mechanical device for opening and closing sofa beds, consisting of a frame structure and a plurality of movable frames connected in series with each other and moved by means of rotationally rectilinear movements, comprising at least one first articulated quadrangle (A) and at least one second articulated quadrangle (B), interconnected and driven by the indicated movement, characterized in that the number of connecting rods in the quadrangle (A) is not greater less than three, and the number of connecting rods in the quadrangle (B) no more than two. 2. The mechanical device according to claim 1, characterized in that said quadrangle (A) includes connecting rods (1, 2, 3) and a fourth side formed by a part of the support base (21) enclosed between the connecting points (1 ') and (2 '), while said quadrangle (B) includes rods (4, 5), as well as a part of the frame (6) enclosed between the nodal joints (4' ') and (5'), and part support base (21), enclosed between the nodal connections (5``) and (4 '). 3. The mechanical device according to claim 1 or 2, characterized in that it includes a quadrangle (C) consisting of rods (17, 18), and completed by a rod (14) and a part of the frame (15) enclosed between the nodal joints ( 14``) and (17 '), a mechanical stop (K), a tube of the front frame (7) and a plate (6) fixed to the specified tube, the tube of the central frame (9) and the hinge assembly (8) between the specified tube of the front frame and the tube of the rear frame, the tube of the lower frame (15), the return rod (10) of the specified tube of the lower frame, the fixed plate (11), the hinge assembly between the tube the neutral frame and the lower frame tube (12), the first return rod (13) of the specified lower frame and lower support tube, the second return frame (14) of the specified lower frame and lower support tube, the lower support rod (16) and the rear frame support, shaped the base (19), the rear frame (20), the support base (21) of the quadrangles (A), (B) and the mechanical stop (K), the first return spring (22) between the rod (3) and the hinge unit (8) and the second a return spring between the rod (3) and the rod (4). 4. The mechanical device according to claim 3, characterized in that said mechanical stopper (K) prevents accidental closures of the design of the sofa bed. 5. The mechanical device according to claim 4, characterized in that the force F applied to the free end of the frame structure causes the rod (4) of the quadrangle (B) to rotate around a fixed point α in a counterclockwise direction and moves it away from the stopper (K ), ensuring the closure of the sofa bed. 6. The mechanical device according to claim 4, characterized in that the force of weight P exerted on top of the sleeping surface causes the rod (4) to rotate around a fixed point α in a clockwise direction until it is stopped, thus preventing the sofa from closing -beds. 7. The mechanical device according to claim 4, characterized in that when optimizing the size and position of the rod (5), the force of weight P applied from above to the sleeping surface causes the specified rod (5) to rotate an angle β counterclockwise, balancing it in an upright position with minimal energy consumption, thus preventing the accidental closure of the sofa bed. 8. The mechanical device according to claim 3, characterized in that the pillow removal system is achieved only by two rods (17) and (18). 9. A mechanical device according to claim 8, characterized in that the rod (18) rotates at the same point at which the rod (14) and the lower support (16) are also pivotally attached. 10. The mechanical device according to claim 2, characterized in that the combination of connecting points (4 '), (1') and (2 ') allows you to remove the support base (21), replacing it with a side element (25).

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