COUNTERFRAME FOR SLIDING DOORS EQUIPPED BY MECHANICAL SYSTEM THAT ALLOWS THE DOORFRAME AUTOMATIC BACK MOVEMENT.

TECHNICAL FIELD The object of the present invention concerns the sector of the doorframes for house building.

Particularly, it deals with a counterframe for sliding doors equipped by mechanical system that allows the doorframe automatic back movement.

BACKGROUND ART

In the fixtures field for house building are well known the counterframes integrated to the building structures, which constitute means of support and anchorage for the frame and its doorframe. Moreover, sliding doors are even well-known, which can be of different types.

A first application, surely more traditional, foresees a wall in whose interstice is drawn a longitudinal place for the embedding of a door that becomes sliding through the use of superior or inferior guides put together to the building structure.

Subsequently, some systems have been characterized by systems with the presence of counterframe integrated in the building structures, which foresee the employment of some elements of performed plate assembled among them which are referred to: a box, to associated to the wall,

provided, on the other side, by jamb which delimits the opening or the port, equipped by a guide, on the superior part, that allows the longitudinal slide of the doorframe. On the box sides, according to the destination, a lath can be put as a mean of stabilization for the final covering, made by the plaster, or foreseeing some particular conformations of profiles to create some seals for plasterboard panels.

These and other assimilable solutions, differ to one another in the use of metallic section bar rather than others, of guides disposed in the superior or inferior parts rather than saddles, of side laths for plaster rather than systems for the anchorage of plasterboard panels or similar, but all the systems have in common the problem that sliding door is handed moved by the customer who has to provide the opening and closing of the doorframe.

To avoid this problem some electric-electronic systems have been implemented with the use of some photoelectric cells, based on the doorframe, that carry out the movement of the doorframe with electric engines. These systems have some inconveniences such as reliability, cost and maintenance required from the customer, the installation difficulty, assemblage and times of lying in work for technicians. To avoid these problems, many solutions and based systems have been proposed: the first regards a pulley system with counterweights that, although it resolves the problems related to the presence of electric- electronic devices, it introduces other inconveniences such as the necessity of space to allow the correct vertical movement of the

counterweights and functionality to which it joins therefore the difficulty of the laying in work and of the maintenance operations and the predisposition of passive safety systems that act in case of breakdown of the systems pulley-ropes that heavily influence the costs of realization.

The second refers to a device of self-regulating compensation having two or more gas or hydraulic shocks-absorbers that act as both in compression and extension, that makes, besides, the movement of the doorframe self-assisted; however, this system introduces some problems related to the necessity of space for the positioning of the shocks- absorbers, whose dimensions vary to the vary of dimensions of the doorframe, to the request of specialized manpower for the maintenance and costs.

In these counterframe typologies belong the solutions proposed with small variations, object of the patents number: US20010039761 , US005579607A, FR2708964A.

However neither the technique states currently in use, nor the existing solutions of patents overcome the quoted critical aspects.

DISCLOSURE OF INVENTION

The aim of the present invention is to overcome the difficulties and the present disadvantages in the solutions in use.

One of the principal assignments of the object consists of resolving the inconveniences and the problem listed above realizing a

counterframe for sliding doors integrated in the building structures equipped by a mechanical system that allows the doorframe automatic back movement.

Another purpose consists of realizing a counterframe of more universal and easier application that needs a reduced space for the positioning of the mechanical system of return.

A further purpose consists of realizing a counterframe that allows an easy inspection and maintenance being the mechanical system removable and detachable from the superior guide of it. Another aim consists of realizing a counterframe that allows the employment to both professional and domestic environments.

Another use consists of realizing a counterframe from the high reliability given by the lack of electric-electronic components.

Another purpose consists of realizing a counterframe that guarantees the safety of the same device given by the lack of motors and photoelectric cells that handle the automatic movement of the doorframe.

Least but not last, the realization of a counterframe that allows the rationalization of the costs being it constituted by easily available elements. Besides, a counterframe for sliding doors is provided made up by a structure of containment or box defined by a series of spaced-out ledgers attached, from one side, to the outer frame of it and, on the other, to the proper section bar or stringer in which the base ledgers are drawn, from a superior one, that support a guide, sustained from a side to the jamb as

a doorpost, on the other attached to the box, from a jamb as a doorpost, properly carved and settled for the lodging of a mechanical system, from one side sustaining the extremity of the superior ledger and the other one eventually anchored to the base one, characterized by a mechanical system that, when the doorframe is brought by the customer to the closed or opened position, produces a tension or strength, whose entity is adjustable through a particular device, that allows the same doorframe, when released by the customer, the automatic back movement, and characterized by the fact that, if this doorframe is brought in the position of opening, a simple block system both fixed joint or magnetic will avoid its movement defusing it.

One application foresees that the mechanical system 1 is positioned on the shaped jamb 2 of the counter frame, from the closing side of the doorframe 3 (see Fig. 1). Such mechanical system is made up by a plate and two perforated stirrups 4 (see Fig. 2), which have to be fixed on the counterframe whose function is as a support to a sectional metallic thick wheel 5. In the metallic wheel there is a band ribbon fixed, on a side, by the stirrup and, on the other, to the same metallic wheel. On the wheel it is fixed and wounded a thread or ribbon, or similar, of plastic material or others whose other extremity is directly connected to the doorframe through a proper fixing system. On the case a small wheel 6 having the guide function is positioned for the thread or ribbon or similar.

A second application of the object foresees that the mechanical system is prepared on the superior main guide of the counterframe in such way that the axle of wrapping of the band ribbon, in the metallic wheel of the mechanical system, is perpendicular to the plan in which it is contained the superior ledger. On the wheel it is fixed and wounded a thread or ribbon, or similar, of plastic material or others whose other extremity is directly connected to the doorframe through a proper fixing system. The whole system is covered by a suitable panel or covering in wood or in plastic or metallic material. The so realized system allows that, when the doorframe slides from the closed to the opened position, the thread or ribbon or similar connected to it loads the band ribbon producing a tension that allows to the doorframe the automatic back movement, when released by the customer. Besides, the mechanical system is equipped with a particular device that allows the regulation of the tension entity or produced strength.

Advantageously, sideways to the box of the sliding door counterframe, according to the destination, a nylon or other plastic material lath can be associated, this device improves the stabilization for the final covering compared to the traditional metallic lath used.

Advantageously, sideways to the box of the sliding door counterframe on both sides, according to the destination, some particular conformations of such profiles can be foreseen to create some seals for plasterboard panels.

Advantageously, the mechanical system, obj ect of the present invention, is applicable also subsequently, to a counterframe already installed.

Description of the advantages that the invention adds to the art: 1 . A mechanical system that allows, taking advantage of the opening and closing movement of the doorframe, to produce a strength or tension, easily adjustable that allows the automatic back movement of the doorframe.

2. Reduced space for the positioning of the mechanical system on the jamb of the counterframe making more universal and easier its application.

3. Easy maintenance being the mechanical system removable from the counterframe and the doorframe detachable from the superior guide in order to be the thread or ribbon, or similar substituted.

4. Employment fields both in professional and domestic environments.

5. System reliability given by the lack of electric-electronic components. 6. System safety given by the lack of motors and photocells that provide for the automatic doorframe movement. 7. Cost rationalization being the whole case realized by available elements.

The object is not limited to the given description but it can be improved and changed by the customer.

BRIEF DESCRIPTION OF DRAWINGS In the Fig. 1 is brought an view of the counterframe in which it is possible to distinguish the box, the outer doorframe of it, the superior ledger and the jamb as a doorpost.

In the Fig. 2 a frontal view of the counterframe is showed, in particular about a jamb as a doorpost, opportunely carved and predisposed 8 for the lodging of the mechanical system.

In the Fig. 3 a side view of the counterframe is showed in which it is possible to notice the mechanical system 1 , positioned on the case 2 opportunely shaped, from the closing side of the doorframe 3. On the counterframe there is a small wheel 6 with the function of guide for the thread or ribbon, or similar, of plastic material or others 7.

In the Fig. 4 a design of the mechanical spring-loaded implemented system is showed in which the plate and the two perforated stirrups 4, which have to be fixed on the counetrframe, are underlined because of their function as supports to a sectional metallic thick wheel 5. In the metallic wheel, there is a band ribbon fixed, on a side, by the stirrups and, on the other, to the metallic wheel, that is loaded, producing a tension, when the doorframe slides from the closed to the opened position allowing the automatic back movement of it, when released by the customer.

The invention is not limited to the description given but it can be modified without lying outside the patent.

This invention has several advantages and enables the user to overcome a number of problems which could not be solved if the customer uses currently available systems.