This invention relates to a chamber sliding system consisting of a floating deformable parallelogram and a level roll; the systems operate in pairs with desmodromic drive and are used to multiply the usable surface of containers, houses and caravans, with fast location- relocation and any destination.

Currently, the systems based on deformable parallelogram used for multiplying the usable surfaces, cannot withstand the vertical component of plane parallel movement; for this reason, ceilings are floating, on one hand, and the drive system follows the chamber moving in plane parallel movement and, on the other hand, sealing requires a very complex set of gaskets, leading to a rather complicated structure, with low reliability and high costs.

There is a known case, referred to in document WO 2010015062, of an actuating system for an expandable trailer that uses a rack-pinion gear into contact with every expandable support installed under the trailer. It is obvious that such a system should be built with utmost accuracy, resulting in an unavoidable increase in its manufacturing costs.

The document US6679541 Bl refers to a joint assembly, with chain and scissor system, actuated by a hydraulic cylinder aimed at performing a coordinated linear movement of an expandable caravan chamber, system that is also very difficult to build.

Other types of expandable structures are described in documents US5966956, US5772270, US5345730 or US7607365. These systems also provide various solutions for building expandable containers, but they do not have elements similar to the solution proposed by this invention.

An improved solution is described in the patent RO127820/14.05.2012, with the title "Multiple expandable container", conceived by the authors of this invention. In the parallelogram-based system of this solution, the ceiling is no longer floating, but partly expandable. Sealing between compartments is provided by an inflating pad and the container is placed on the ground by means of a segmented inflating pad that significantly reduces the assembly time.

This invention eliminates the above mentioned disadvantages due to the following: - the chamber sliding system can be built as a cascade chamber sliding system, or as a symmetrical chamber sliding system;

two cascade chamber sliding systems or two symmetrical chamber sliding systems placed in a mirror-like position, in parallel vertical planes, with desmodromic coupling provided by the driving gear unit and forming the cascade chamber sliding assembly, respectively the

l symmetrical chamber sliding assembly; each sliding level is sealed by a system based on truncated cone bellows;

- the cascade chamber sliding system is located between the side wall of the fixed chamber and the side wall of the mobile chamber; it consists of a floating deformable parallelogram made up of two connecting rods, secured to the floor of the mobile chamber by means of lower cylindrical joints, through the stringer and the top cylindrical joints to the side of a cantilever beam, with free vertical sliding on a pole; the latter is secured between the floor and the ceiling of the fixed chamber; the other part consists of a level roll fixed to the stringer of the fixed chamber and to a balance spring, installed on the floor of the fixed chamber and under the cantilever;

- the symmetrical chamber sliding system is positioned between the side wall of the mobile chamber and the side wall of the large mobile chamber, and is similar to the cascade chamber sliding system, except that a deformable parallelogram is fixed to the cantilever beam by means of lower and upper cylindrical joints, to the stringer of the large mobile chamber floor, and another level roll is fixed to the stringer of the fixed room; the two parallelograms operate in parallel planes with desmodromic symmetrical drive through two coupled gears centred in the upper cylindrical joints, located in the free space between the parallelograms and each fixed to a connecting rod of the relative deformable parallelogram;

- the roller chain, example 1, is positioned under the stringer of the mobile chamber floor in the sliding direction, has sprockets fixed to the stringer of the fixed chamber floor; each sprocket has its driving shaft connected to the exterior, and a chain wrapped sprocket acts as a level roll, the roller chain is coupled via appropriate coupling to the edge of the mobile chamber floor; the roller chain is actuated by a one-way lever or by an electromechanical system.

- the roller chain, example 2, is similar to the roller chain in example 1, except that it is located under the stringer of the large mobile chamber floor and is secured via the appropriate coupling to the edge of the large mobile chamber floor.

- the sealing assembly is installed at the level of each sliding system and is made up of a truncated cone bellows, with the large base mounted to the fixed chamber, and the small base sliding on the mobile chamber, or on the large mobile chamber, and locked to the sealing position on the outside of the small base, with a strap coupling system.

The advantages of the chamber sliding system, as per this invention, consist of the fact that it cancels the effect of the vertical component of the parallel plane movement, resulting in simplified construction of the chambers and the actuation system, as well as the simplification of the sealing assembly, with positive effects such as construction simplicity, increased liability and reduced manufacturing costs.

Below are two examples for the realization of the invention with reference to Figures 1-8, which represent: example 1 - cascade expansion; example 2 - symmetrical expansion:

-fig.1 : perspective view of the cascade chamber sliding assembly (example 1), at the beginning of expansion;

-fig.2: perspective view of the cascade chamber sliding assembly (example 1), partly expanded;

-fig.3: perspective view of the cascade chamber sliding assembly (example 1), at the end of the expansion;

-fig.4: perspective view of the maximum expanded chambers, according to example 1 ;

-fig.5: perspective view of the symmetrical chamber sliding assembly (example 2), at the beginning of expansion;

-fig.6: perspective view of the symmetrical chamber sliding assembly (example 2), partly expanded;

-fig.7: perspective view of the symmetrical chamber sliding assembly (example 2), at the end of expansion;

-fig.8: perspective view of the maximum expanded chambers, according to example 2.

To better understand the drawings and the descriptions, the following references or concepts of the current technical knowledge, which are not directly related to the invention solution, shall not be explained: in mirror, desmodromic, electromechanical, sliding area, plane-parallel movement, horizontal component, useful effect, sliding movement, vertical component, secondary effect, upper branch, lower branch.

From a constructive point of view, the system is made up of the following:

- the chamber sliding system according to the invention, can be built as a cascade chamber sliding system (1) according to example 1, fig. 1, 2, 3, 4 or as a symmetrical chamber sliding system (2),

example 2, fig. 5, 6, 7, 8, two cascade chamber sliding systems (1) or two symmetrical chamber sliding systems (2), in mirror-like position, in vertical parallel planes, with desmodromic coupling provided by driving gear assembly (3) and

form the cascade chamber sliding system (4), respectively the symmetrical chamber sliding system (5); sealing at the level of each sliding area is provided by the sealing assembly consisting of truncated cone bellows (6); - the cascade chamber sliding system (1), example 1, fig.l, 2, 3, 4, is positioned between the side wall (7) of the fixed chamber (8) and the side wall (7) of the mobile chamber (9) and consists of a first element, namely, a floating deformable system (10) made up of a deformable parallelogram (11), which is composed of two connecting rods (12) secured to the floor (14) through the lower cylindrical joints (13) of the mobile chamber (9), through the stringer (15) and through the upper cylindrical joints (16) to the side of a cantilever beam (17), with free vertical sliding on a shaft (18), which is secured between the floor (19) and the ceiling (20) of the fixed chamber (8), and of a second element, a level roll (21) fixed to the stringer (22) of the fixed chamber (8) and to a balance spring (23), placed on the floor (19) and under the cantilever (17);

- the symmetrical chamber sliding system (2), example 2, fig. 5, 6, 7, 8, is positioned between the side wall (7) of the mobile chamber (9) and the side wall (7) of the large mobile chamber (24), is similar to the cascade chamber sliding system (1), according to claims 1 and 2, example 1, except that a further deformable parallelogram (11) is fixed to the cantilever beam (17), by means of lower cylindrical joints (13) and upper cylindrical joints (16), to the stringer (26) of the large mobile chamber (24) floor (25), and another level roll (21) is fixed to the stringer (22) of the fixed chamber (8); the two parallelograms (11) operate in parallel planes, with desmodromic coupling in symmetrical movement ensured by two driven gears (27) centred in the upper cylindrical joints (16), located in the free space between the parallelograms (11) and each of them is fixed to a connecting rod (12) of the relative deformable parallelogram (11);

- the roller chain (28), example 1, is positioned under the stringer of the mobile chamber (9) floor (15) in the sliding direction, has dual-drive sprockets (29) fixed to the stringer (22) of the fixed chamber (8) floor (19); each sprocket (29) has its drive shaft (30) connected to the outside, and a chain (31) wrapped sprocket (29) acts as a level roll (21), the roller chain (28) is coupled via the appropriate coupling (32) to the edge of the mobile chamber (9) floor (33); the roller chain (28)

is actuated by a one-way lever (34) or a electromechanical system.

-the roller chain (28), example 2, is similar to the roller chain (28) in example 1 except that it is located under the stringer (26) of the large mobile chamber (24) floor (25) and is fixed via the coupling (32) to the edge of the large mobile chamber (24) floor (33);

- the sealing assembly (6), examples 1 and 2, is located at the level of each sliding area and is made up of truncated cone bellows (35), with the large base (36) mounted to the fixed chamber (8), and the small base (37) sliding on the mobile chamber (9) or the large mobile chamber (24) and locked to the sealing position to the outside of the small base (37) by means of a strap coupling system (38).

The assembly procedure ensures the operating conditions as follows:

- the fixed chamber (8), the mobile chamber (9), according to example 1 and the large mobile chamber (24) as in example 2, are intertwined entirely within the fixed chamber (8), their facades are parallel with a system of orthogonal planes and preset sliding backlashes, the sliding system assembly (4) or (5) together with the actuating system assembly (3) runs freely the sliding movement of the mobile chamber (9), example 1, and of the large mobile chamber (24), example 2; the sealing assembly (6) is provided for each sliding area.

From a functional point of view, the cascade chamber sliding system (1) according to the invention, example 1, fig. 1, 2, 3, 4, works as follows:

-the floating deformable parallelogram (10), due to the action of the roller chain (28) transmitted via the stringer (15) to the lower cylindrical joints (13), executes a plane-parallel movement which continuously maintains the floor (14) in a parallel position with the cantilever beam (17);

-the horizontal component of the plane-parallel movement is considered a useful effect and is defined as a sliding movement by leaning the floor (1) onto the level roll (21) made up of the sprocket (29) - chain (31) assembly;

-the vertical component of the plane-parallel movement is considered a secondary effect and is freely taken over by the horizontal beam (17) that slides on the shaft (18), the sliding stress being reduced by the balance spring (23).

From a functional point of view, the symmetrical chamber sliding system

(2), according to the invention, example (2), fig. 5, 6, 7, 8, works as in example 1, except that the deformable parallelogram (11), corresponding to the large mobile chamber (24), is moved symmetrically by the gears (27), and the sliding plane is defined by the level roll (21).

The cascade sliding system (1), from example 1, fig. 1, 2, 3, 4 or the symmetrical sliding system (2) from example 2, fig. 5, 6, 7, 8, is actuated from the outside by the sprocket shaft (30), with one-way lever (34), or electromechanically, one for each cascade chamber sliding system (1) or symmetrical chamber sliding system (2), and always acts in the expansion direction of chain upper side (31).

The desmodromic coupling is ensured, in case of manual actuation, by reading the position and communicating it verbally, or through electric shaft, in the case of electromechanical actuation. The sliding movement induced to the mobile chamber according to the example (1) can continue until the floor frame (15), belonging to the mobile chamber (9) slides over the chain wrapped (31) sprocket (29) and continues the movement gravitationally, controlled by the chain (31) through the coupling (32) and due to the additional length of the non-stretched chain section (31), it is aligned with the fixed chamber floor (8) level. In example 2, the symmetrical expansion, the sliding movement induced to the mobile chamber (9) and the large mobile chamber (24) is similar to the sliding movement in example 1, except that the floor of the large mobile chamber (25) is in line with the floor of the fixed chamber (8), and the floor (14) of the mobile chamber (9) rests on the floor of the fixed chamber (8).