BR102018012192A2 - improved lower car frame for sliding door support system especially for furniture - Google Patents

Abstract

The invention relates to an improved undercarriage structure for sliding door support system especially for general furniture, aiming at structural improvements that ensure an extremely functional and practical structure, with extreme operational simplicity, properly enclosed in order to avoid dirt accumulation. The invention comprises a front (1) and rear (2) split housing housing an inner side (3) caster support arm (4), laterally pivoted (5); comprises arm height adjustment mechanism (3) caster support (4), consisting of a shaft-mounted gear (6), capable of external mechanical turning, which drives a rack (7), which has a lower ramp (8 ), which moves in the same profile (9) provided on the unpivoted end of the arm (3); does it include a locking mechanism for mounting and anti-derailment based on the magnetic principle of attraction respectively? crash? and repulsion? anti-derailment? provided by the action of magnets (10) which will be properly installed in a socket (11) provided for in said arm (3) and in an upper support (12), next to it, capable of external mechanical rotation.

Description

(54) Title: ENHANCED BOTTOM CAR STRUCTURE FOR A SLIDING DOOR SUPPORT SYSTEM ESPECIALLY FOR FURNITURE (51) Int. Cl .: E05D 15/06.

(52) CPC: E05D 15/0665.

(71) Depositor (s): BIGFER INDÚSTRIA E COMÉRCIO DE FERRAGENS LTDA.

(72) Inventor (s): GERALDO JOSÉ ALEXANDRINI.

(57) Abstract: The invention deals with an improved structure of a lower carriage for a supported sliding door system, especially for furniture in general, aiming at structural improvements that guarantee an extremely functional and practical structure, with extreme operational simplicity, properly enclosed in order to avoid accumulation of dirt. The invention comprises a split, front (1) and rear (2) carcass, housing in its interior an arm (3) supporting the caster (4), laterally pivoted (5); comprises arm height adjustment mechanism (3) caster support (4), consisting of a gear arranged on an axis (6), capable of external mechanical rotation, which activates a rack (7), which has a lower ramp (8 ), which moves in the same profile (9) provided at the non-pivoted end of the arm (3); does it include a locking mechanism for assembly and anti-derailment, which is based on the magnetic principle, respectively, of attraction? crash? and repulsion? anti-derailment? provided by the action of magnets (10) that will be properly installed in a socket (11) provided for in said arm (3) and in an upper support (12), close to this one, capable of external mechanical rotation.

5-1 / 18 IMPROVED BOTTOM CAR STRUCTURE FOR SLIDING DOOR SUPPORTED SYSTEM ESPECIALLY FOR FURNITURE

Field of Invention [001] The present invention relates, in general, to the technological sector of pulley systems for sliding doors and windows and, more specifically, the peculiar modality of improved structure of lower carriage for supported door system sliding especially for furniture in general, aiming at structural improvements that guarantee an extremely functional and practical structure, with extreme operational simplicity, properly enclosed in order to avoid accumulation of dirt.

[002] Effectively, the present invention has for object, peculiar modality of improved structure of lower car for supported system of sliding door especially for furniture in general, carefully and carefully designed with the intention of characterizing something really new and capable of occupying a place of prominence, when confronted with the characteristics presented by the equipment or devices known in the state of the art of this technological sector known to date.

Background of the Invention [003] It is known, through the state of the art, known in this technological sector, until the present moment, that sliding doors are widely used in furniture, mainly in wardrobes, kitchen and office cabinets, being able, still, be used in other types of furniture etc.

Petition 870180051325, of 6/15/2018, p. 5/27

-2/18 [004] Currently, there are several sliding door systems, commonly used in furniture in general, superimposed or embedded in the doors, these systems slide mostly on aluminum or polymer rails, and have systems to prevent the derailment in relation to the rail, using springs of different shapes to move moving parts of the cars for this purpose, to assemble the systems with these characteristics a mechanical lock is needed to assist in the assembly of the set on the furniture, keeping these moving parts as closed possible.

[005] Another feature that has been extensively explored and appreciated in this type of product is the height adjustment of the door, allowing adjustments according to furniture variations, these adjustments are mostly made through common screws mounted on the product that, several times, tend to deregulate with vibrations or knocks on the furniture door.

[006] Therefore, it is known about the state of the art of the existence of numerous sets and pulley systems for sliding furniture doors in general, as described below, obtained through research carried out in databases available for consultation.

[007] So we know the existence of the American patent

US3959849, deposited on 08/08/1975 and granted on 06/01/1976, by Robert J. Marquart, entitled “Set of pulleys for sliding doors”, which reveals a pair of pulley supports used in sliding doors, which they slide sideways and mounted side by side to each other, in a telescopic mount and with a spring interposed between the supports, being provided with means to maintain the spring and the

Petition 870180051325, of 6/15/2018, p. 6/27

-3 / 18 retracted pulley to facilitate the installation of the device on the door jamb, after which the support is quickly released to allow the spring to be effective in its function of supporting the door.

[008] From the Brazilian document PI0101392-0, deposited in

12/03/2001, by Paulo Roberto Corradi (BR / RS), published on 06/18/2002, entitled “Sliding system with coplanar effect closing for two or more doors”, which reveals a system to be applied preferably in furniture, which can be used, for example, in cabinets with two or more sliding doors, with a system dependent on an upper rail and a lower rail, where upper pulleys and lower pulleys are fixed, respectively, which allow the sliding of doors to they are linked, and this combined slide is provided with a common sliding movement and a translational movement, which causes the door to be opened away from the furniture by means of a small pull on the handle, moving parallel to the door immediately behind or depending on the displacement to the right or to the left, also counting on a spring effect achieved thanks to the action of a specific device existing on the tracks, which and makes the door withstand the pull of opening a little and closes automatically when the closing stroke ends, positioning itself coplanarly in relation to the other doors.

[009] Brazilian document PI0112780-2, deposited in

07/31/2001, by The Gates Corporation (US), published on 06/08/2004, through Unionist Priority US 60 / 222.084 08/01/2000, entitled “Intermediate gear of

Petition 870180051325, of 6/15/2018, p. 7/27

-4 / 18 tensioning ”, which reveals a tensioner having a linear movement. A pulley is pivoted in the direction of the housing. A support is used to slide the housing and a base together. The support restricts the housing and, therefore, the pulley, against movement along a predetermined path. The housing also comprises an arched damping surface that interacts with a friction or damping band. A torsion spring concentricly engages the friction material web, pressing it into engagement with the arcuate damping surface as the housing moves in response to a pulley impulse or force. As a belt load impulse causes the housing to move along the predetermined path, a contact between the damping band and the base causes the spring to further press the friction damping material against the arched surface of the housing, thereby cushioning the movement of the housing. In addition, a pulley axis is offset from a center line of the support. As the housing moves, a coupling is created between the housing and the base acting through the support. The force of the coupling creates a frictional force between the support surfaces, further dampening a movement of the housing and thus a movement of the pulley.

[010] From the Brazilian document MU8203087-1, deposited in

07/11/2002, by Valdir Rigo (BR / RS), entitled Improvements introduced in pulley used in windows or sliding doors, which reveals a mechanism by a fixing base that has a

Petition 870180051325, of 6/15/2018, p. 8/27

-5 / 18 angular lateral housing formed by: two flaps with the ends facing inwards, this angular lateral housing forms a sliding bed whose direction has an angle in relation to the fixation face and has at one of its ends a wall orthogonal to the bed slide with a hole that serves as a passage for the adjustment screw, the fixing face that forms an angle with the sliding bed has a rectangular shape and is provided with two countersunk holes that will serve as accommodation for the screws that will fix the pulley in the window or sliding door; a height-adjustable guide of appropriate shape to fit in the lateral housing of the fixing base provided, on its side, with a stepped pin that serves as the axis for fixing the caster, which is fixed there by kneading the tip of this pin, at its end the guide has a hole with an internal thread where the height adjustment screw for the pulley will be inserted; a caster constructed with a bearing coated with plastic material that will be attached to the pulley height adjustment guide; the caster, in turn, is fixed on the height regulator guide pin that slides inside the side housing on the sliding bed of the fixing base and is fastened to this base through the adjustment screw. When the screw is activated, the height adjustment guide slides in the side housing on the slide bed of the fixing base, providing the height adjustment of the pulley.

[011] From the Spanish document ES1054979, deposited in

28/05/2003, by Royde S. Coop. Ltda, published on 16/09/2003, entitled “Herraje com antidescarrilamiento para puertas

Petition 870180051325, of 6/15/2018, p. 9/27

-6 / 18correderas ”, which reveals a roller for sliding doors with a fixed housing and a rotatable movable portion with caster, containing a helical spring connecting the mobile arm to the fixed housing.

[012] From the Spanish document ES1058190, deposited in

07/20/2004, by Royde S. Coop. Ltda, published 11/16/2004, entitled “Assembly work for height-regulating devices in puertas or ventanas correderas”, which reveals a pulley for sliding doors equipped with casters and helical springs, claiming a top assembly lock equipped with a cylindrical body equipped with an angular coupling, dimensioned for its adjustment next to the adjustment screw that fits in the housing hole, in which case the height adjustment screw is fixed on the movable arm, projecting from inside it, while the stop is the upper part of the housing itself and contains vertical helical springs attached to the rotating plate, with higher height adjustment.

[013] From the Brazilian document PI0403096-6, deposited in

07/20/2004, by Darci Gomes (BR / SC), published on 03/07/2006, entitled Pulley set and flexible lock for sliding mobile door, which reveals an invention that aims to reduce the friction between the door sliding and rails in addition to allowing its removal when the user wishes, thus allowing multiple advantages ranging from the efficient sliding of the door to its easy removal and placement, and can be installed on doors of different sizes . The invention consists of a top piece that has holes for fixing and is hollow, in addition to

Petition 870180051325, of 6/15/2018, p. 10/27

-7 / 18 must be provided with a flexible lock that maintains at its end an extension for the upper fitting for coupling to the upper rails. The flexible lock is spring-loaded and limited by a movement limiter. The lower part, on the other hand, also has holes for fixing and has a hollow cylindrical part, with a wheel that rotates on a fixed axis. The extension of the cylindrical part is called the extension for the lower fitting and its purpose is to allow the fitting of the door on the lower rails.

[014] From the Brazilian document PI0702425-8, deposited in

08/17/2007, by Marcus Augusto Rigo, published on 04/14/2009, granted on 06/08/2013, entitled “Constructive arrangement applied in pulley for sliding doors”, which reveals a pulley consisting of a frame where it is installed the caster equipped with lateral recesses in the axis that is solidary to the movable plate where the helical springs are fixed, characterized by the movable plate containing specific flaps that fit and slide along the existing rails in the housing, with the helical springs for anti-skidding effect are confined between the lower pins of the housing and the upper pins of the movable plate whose movable plate that contains the upper stop that allows the height of the door to be regulated and the travel of the helical springs through the height adjustment screw threaded into the hole in the housing together reinforcement; the housing contains the left side slot where the mounting lock is inserted which blocks the movement of the movable plate carried out by the helical springs, and the housing also contains the right lateral slot where the disarming lock is fixed, for

Petition 870180051325, of 6/15/2018, p. 11/27

-8 / 18 disassemble the pulley, which is fixed superimposed on the furniture door by screws placed in the holes perpendicular to the face of the door.

[015] From the Brazilian document MU8701339-8, deposited in

06/09/2007, by Marcus Augusto Rigo (BR / RS), published on 09/24/2013, granted on 09/24/2013, entitled “Constructive form used in pulley”, which reveals an internal anti-skid spring system with height adjustment by means of a screw, in order to prevent the pulleys from escaping from the rails arranged in the lower box. The model contains a plastic housing, where a metallic arm can move, compressed by the weight of the door and pushed back by the actuation of the spring, preventing the wheel from derailing from the rail where it runs.

[016] From the Brazilian document BR202013003006-1, filed on 07/02/2013, by Marcus Augusto Rigo (BR / RS), published on 05/05/20115, entitled “Constructive arrangement applied in pulley for sliding doors”, which reveals the frame with a caster attached to the axle attached to the plate, where the springs are fixed, the course of which is regulated by the threaded screw, and the lock blocks the vertical movement when displaced by the rail, characterized by the fact that the lock between the frame and the plate is attached to the rectangular orifice under pressure, the latch being made up of a larger body with lateral extension for plate locking, teeth with lateral protrusions for fixing the latch under pressure in the rectangular orifice of the frame that later contains the prismatic protruding reinforcement bar horizontal.

Petition 870180051325, of 6/15/2018, p. 12/27

-9/18 [017] From the Brazilian document BRPI07482-5, deposited in

11/25/2011, by Naza Importadora Ltda-ME, published on 05/24/2016, entitled “Pulley with easy adjustment with anti-skidding”, which reveals a different and innovative method characterized by presenting in FIGURE 1, top front view a cover for nylon bearing that protects the bearing on the side is the support for mobile bearing that serves as support and regulation through a spring and inside its internal support. In FIGURE 2, front view of the sheave, a spiral-type spring can be seen on the inside of the part, and a little further down there is a lock that will give its assembly purpose. You can still see the nut that is used to fit the screw. FIGURE 3 shows the adjustment screw that is tilted, thus facilitating the adjustment made with the screwdriver, the mounting lock that is arranged on the bottom of the chassis and the lock that is a system that locks the bearing. Looking at FIGURE 4, an internal view of the pulley, it is possible to observe that the screw is used for the adjustment that allows the drive at an angle with a screwdriver, and inside the pulley is the nut that supports the screw. FIGURE 5 also represents the interior of the part, but at another angle, this time showing the spiral spring and the bearing lock. In FIGURE 6 is the chassis that covers the inside of the pulley, as well as the bearing and its cover. Finally, FIGURE 7 shows the screw arranged at an angle inside the chassis and the lock for adjusting the pulley.

[018] From the Brazilian document BR202013003007-0, filed on 12/07/2013, by Marcus Augusto Rigo, published on

Petition 870180051325, of 6/15/2018, p. 13/27

-10/1802/12/2014, entitled “Constructive arrangement applied in pulley”, which reveals a housing equipped with a pin for fixing the rotating arm through the bearing, and the rotating arm has the pin for fixing the caster, being the device fixed by screws placed in the holes characterized by the stop provided with a projection for fitting the lock, which is composed of the flattened circular base followed by the pin provided with a tooth for fitting the projection, the lock being fitted into the oblong hole with a sliding bed for the circular base; the rotating arm has the tooth for the fitting and movement of the torsion spring provided with a coupling fixed to the rear pin internal to the protection that contains the opening and the hollow parts; the height adjustment of the rotating arm is made by means of a spanner, moving the nut through the groove with chamfered ends, determining the position of the screw inserted in the protection and L-shaped support, under which the lock is adjusted next to the stop.

[019] From the Brazilian document BR102018003873-7, filed on 02/27/2018 and on this date not yet published, by Bigfer Industria e Comercio Ltda, applicant of the present request, entitled “Structure of lower carriage for specially supported sliding door system for furniture ”, which reveals a rectangular polymeric housing, provided with details, cutouts and appropriate fittings to enable the installation and operationalize the operation of a central tilting arm, with a pivoted end and the other end equipped with a roller or pulley, whose Functional position is regulated by a multifaceted upper meat screw, aided by an internal laminar spring

Petition 870180051325, of 6/15/2018, p. 14/27

-11 / 18superior and maintained by a side locking button, the whole being enclosed by a rear closing plane cover, affixed to said housing by means of appropriate screws; the rectangular housing is polymeric, enabling its manufacture in different colors and shades, according to the predominant colors and design of the utility furniture; the central arm can be tilted, through the lateral pivot, allowing the adjustment of the functional height of the roller or pulley and, consequently, of the door of the utility furniture; the multifaceted meat screw must be provided with a central opening of an appropriate shape, which makes it possible to regulate it by an "allen" type key or screwdriver, without distinction; the internal spring must be manufactured in laminar form, requiring less internal space necessary for its accommodation and adequate operation; the side locking button, pivoted, “on-off” type, to be easily operated manually, its use of tools, and to lock the movement in the vertical direction of said tilting arm, by fitting it in its extreme lateral shoulder; the rear flat closing lid may alternatively be polymeric and in the same color as said housing or be metallic or, still, be made of another suitable material; the assembly of the operational components enclosed in a housing with a lid, provides an increase in the service life of the lubrication carried out, keeping them protected against dirt for a longer period of time.

[020] It is known that these described systems and assemblies, pertinent to the state of the art, notably systems for sliding doors supported with overlap mounting, focus on functionality and ease of manufacture at the expense of aesthetics

Petition 870180051325, of 6/15/2018, p. 15/27

-12 / 18 of the set, in such a way that the mechanisms, parts and apparent screws on several occasions do not contribute to the design and practicality of cleaning the product on the furniture, greatly facilitating the accumulation of dirt.

Novelty and Objectives of the Invention [021] Therefore, the objective of the present invention is to characterize a peculiar modality of an improved structure of a lower carriage for a sliding door supported system, especially for furniture in general, whose novelty and inventive activity is based on a mechanism height adjustment and a magnetic mechanism to prevent derailment and position locking for installation of the utility furniture door.

[022] The objective is to characterize a peculiar modality of improved structure of the lower carriage for a supported sliding door system, especially for furniture in general, which comprises a longitudinally split carcass and whose interior has an internal arm called the support for the caster, laterally pivoted, making tilting movements around an axis, raising or lowering the whole.

[023] The objective is to characterize a peculiar modality of improved structure of the lower carriage for a supported sliding door system, especially for furniture in general, which includes a height adjustment mechanism for the inner arm supporting the caster, consisting of an upper gear, arranged in axis, which drives a rack, which has a lower ramp that moves in the same profile provided at the end

Petition 870180051325, of 6/15/2018, p. 16/27

-13 / 18 not pivoted from the support arm with caster, moving it up or down, according to the direction of rotation of said gear. [024] The objective is to characterize a peculiar modality of improved structure of the lower carriage for a supported sliding door system, especially for furniture in general, which comprises a locking mechanism for assembly and anti-derailment, which is based on the magnetic principle of attraction (locking) and repulsion between magnets (anti-derailment), which will be properly installed on the pivoted arm with a roller and in a position higher than this, which can be mechanically reversed from one position to another and vice versa.

Description of the attached drawings [025] In order that the invention revealed in this specification, which is the peculiar modality of the improved structure of the lower carriage for the sliding door supported system, especially for furniture in general, is fully understood and put into practice by any technician in this technological sector, it will be explained in a clear, concise and sufficient way to allow its reproduction, based on the attached drawings listed below.

[026] However, the peculiar modality of improved structure of lower car for supported sliding door system especially for furniture in general, should not be limited to this form of characterization and concretization, and other possible forms of materialization can be considered, which, however , do not fall outside the scope of the present invention, as described in this report.

Petition 870180051325, of 6/15/2018, p. 17/27

-14/18 [027] Therefore, we have that:

[028] Figure 01 represents an isometric view, taken from an upper frontal angle, of the peculiar modality of improved structure of the lower carriage for a supported sliding door system especially for furniture in general, as recommended by the present invention;

[029] Figure 02 represents an isometric view, taken from an upper rear angle, of the peculiar modality of improved structure of the lower carriage for supported sliding door system especially for furniture in general, according to the present invention;

[030] Figure 03 represents an isometric view, taken at the same angle as Figure 01, exploded, of the peculiar modality of improved structure of lower car for supported sliding door system especially for furniture in general, as recommended by the present invention, denoting the constructive details A, B, C and D, of the components that make up the present improved structure;

[031] Figures 04 and 05 represent frontal views, in sequence, of the peculiar modality of improved structure of lower carriage for supported sliding door system especially for furniture in general, according to the present invention, denoting the internal mechanism of height adjustment proposed by the present structure (in this case, its front cover was removed);

[032] Figure 05 represents a frontal view of the peculiar modality of improved structure of lower carriage for system

Petition 870180051325, of 6/15/2018, p. 18/27

-15 / 18 sliding door support especially for furniture in general, as recommended by the present invention, denoting the magnetic mechanism in the locking position for assembly; [033] Figure 06 represents a front view of the peculiar modality of improved structure of lower carriage for supported sliding door system especially for furniture in general, according to the present invention; denoting the magnetic mechanism in the anti-derailment position;

[034] Figures 04, 05 and 06 also represent the internal structural arrangement of the components that make up the peculiar modality of improved structure of lower carriage for supported sliding door system especially for furniture in general, as recommended by the present invention; denoting the operationality and the functioning of these together.

Detailed description of the invention [035] The peculiar modality of improved structure of lower carriage for supported sliding door system especially for furniture in general, according to the attached figures, comprises a longitudinally split housing, in front (1) and part posterior (2), which houses in its interior an arm (3) supporting the caster (4), laterally pivoted (5).

[036] As can be inferred from the analysis of the attached figures, the peculiar modality of the improved structure of the lower carriage for the sliding door supported system, especially for furniture in general, as recommended by the present invention, is characterized by comprising an adjustment mechanism height of the arm (3) caster support (4), consisting of a

Petition 870180051325, of 6/15/2018, p. 19/27

-16 / 18 gear arranged on axis (6), capable of external mechanical rotation, which activates a rack (7), which has a lower ramp (8), which, operationally and functionally, moves in the same profile (9) provided for in non-pivoted end of the arm (3), moving it up or down, respectively, decreasing or increasing the height according to the direction of rotation of said gear (6).

[037] As can be inferred from the analysis of the attached figures, the peculiar modality of the improved structure of the lower carriage for a supported sliding door system, especially for furniture in general, as recommended by the present invention, is characterized by comprising a locking mechanism for assembly and anti-derailment, which is based on the magnetic principle, respectively, of attraction - locking - and repulsion - anti-derailment - provided by the action of magnets (10) that will be properly installed in fitting (11) provided for in said arm (3) and upper support (12), close to this, capable of external mechanical rotation, reversible from one position to another and vice versa. [038] The invention is also characterized by the split housing having appropriately shaped protrusions (13) at the rear (2) that fit into appropriate openings (14) provided at the front (1), ensuring a first fixation between both, which will be complemented a posteriori by screws (not shown).

[039] The invention is also characterized by the arm (3) supporting the caster (4) being manufactured - detail B of Figure 02 - from two pieces of the same shape, antisymmetrical, welded,

Petition 870180051325, of 6/15/2018, p. 20/27

-17 / 18configuring the slot (11) for the magnet (10) and the lower slot for the caster (4).

[040] The invention is also characterized by the gear (6), comprising a vertical axis with orthogonal teeth arranged perimeter and whose ends have cavities to receive mechanical activation of external rotation, via screwdrivers or similar tools, being installed in seats provided on the front (1) and rear (2) of the split housing.

[041] The invention is also characterized by the support (12) comprising an internal seat for the magnet (10), and being endowed with extreme cavities to receive mechanical activation of external rotation, via screwdrivers or similar tools.

[042] The height adjustment of the lower carriage is made by turning the gear (6) that laterally displaces the rack (7), guided by the cavity provided in the front (1) and rear (2) parts of the said split carcass; the rack (7) has a lower profile or ramp (8) with an inclination coinciding with the profile provided in the upper part of said arm (3) caster support (4), which moves up or down, properly pivoted (5 ).

[043] For the operation of the derailment prevention mechanism and assembly lock, we have the installation of the magnets, on the arm (3) roller support (4) with positive polarity always upwards and on the support (12).

[044] For the auxiliary locking of the car assembly, the support (12) is rotated, so that the negative polarity is facing downwards, causing the attraction between the magnets, until they touch.

Petition 870180051325, of 6/15/2018, p. 21/27

-18/18 [045] After assembling the furniture, the support (12) is rotated again, by 180 ° or half a turn, making the magnet (10) with the positive polarity facing downwards, repelling the arm (3) support of the caster (4), making sure that the magnets are always repelling and, in case of oscillation of the door, the arm (3) remains inside the rail that is mounted.

[046] Thus, the objectives of the peculiar modality of improved structure of the lower car for sliding door supported system, especially for furniture in general, have been fully achieved, especially with regard to characterizing a differentiated and peculiar structural arrangement, when compared with the arrangements presented by the known state of the art, as claimed by the present invention.

[047] The present invention deals with a peculiar modality of improved structure of lower carriage for supported sliding door system especially for furniture in general, covered with completely innovative technical characteristics in relation to everything that is known in the state of the art of this technique. technological sector, deserving the legal protection now formalized.

Petition 870180051325, of 6/15/2018, p. 22/27

-1 / 2-

Claims (1)

01. IMPROVED STRUCTURE, comprising a longitudinally split carcass, at the front (1) and at the rear (2), which houses in its interior an arm (3) supporting the caster (4), laterally pivoted (5), characterized by comprising a mechanism for adjusting the height of the arm (3) supporting the caster (4), consisting of a gear arranged on an axis (6), capable of external mechanical rotation, which activates a rack (7), which has a lower ramp (8 ), which, operationally and functionally, moves in the same profile (9) provided at the non-pivoted end of the arm (3), moving it up or down, respectively, decreasing or increasing the height according to the direction of rotation of said gear (6). 02. IMPROVED STRUCTURE, comprising a longitudinally split carcass, at the front (1) and at the rear (2), which houses in its interior an arm (3) supporting the caster (4), laterally pivoted (5), characterized by comprising a locking mechanism for assembly and anti-skidding, which is based on the magnetic principle, respectively, of attraction - locking - and repulsion - anti-skidding - provided by the action of magnets (10) that will be properly installed in the socket (11) provided for in said arm (3) and upper support (12), close to this, capable of external mechanical rotation, reversible from one position to another and vice versa. 03. IMPROVED STRUCTURE, according to claim 1 or 2, and further characterized by the split housing having appropriately protruding protrusions (13) at the rear (2) Petition 870180051325, of 6/15/2018, p. 23/27 -2 / 2 fit into the appropriate openings (14) provided on the front (1), ensuring a first fixation between both. 04. IMPROVED STRUCTURE, according to claim 1 and further characterized by the arm (3) supporting the caster (4) being manufactured from two pieces of the same shape, antisymmetrical, welded, configuring the fitting (11) for the magnet (10) and the lower fitting for the caster (4). 05. IMPROVED STRUCTURE, according to claim 1 and, further, characterized in that the gear (6) comprises a vertical axis with orthogonal teeth arranged perimeter and whose ends have cavities to receive mechanical external turning, via screwdrivers or similar tools, being installed in seats provided on the front (1) and rear (2) of the split housing. 06. IMPROVED STRUCTURE, according to claim 2 and, further, characterized in that the support (12) comprises an internal seat for the magnet (10), and is equipped with extreme cavities to receive mechanical actuation of external rotation, via spanners. slit or similar tools. Petition 870180051325, of 6/15/2018, p. 24/27 -1 / 1 Η-Α Petition 870180051325, of 6/15/2018, p. 26/27 -1 / 1 -