Recessed luminaire assembly and mechanical connection of the parts thereof

Abstract

A recessed luminaire assembly comprises a mounting part 1 for installation of a lighting element, and a support part 5 which is recessed into a suspended ceiling. The inner surface of the mounting part has an annular ledge with slots 4. The outer surface 7 of the mounting part and the inner surface 8 of the support part have tooth elements 10 having a ridge shape in the cross section of the assembly. The height of the ridges is the same in both parts, and the cylindrical mounting part has, in the thinnest region of the wall of the cylinder, a thickness that is not less than the height of the ridges. The outside diameter of the cylinder is commensurate with the diameter of an opening in the support part. The technical result is that of allowing easier and more reliable mounting of the assembly into a grid and panel-type suspended ceiling.

Description

[0001] Built-in luminaire insert and its mechanical connection FIELD OF TECHNOLOGY

[0002] The invention relates to the field of electrical engineering, in particular to devices for mounting light fittings in frame-and-sheathing suspended ceilings, primarily built into the plane of such a ceiling, where the light source itself remains visible.

[0003] LEVEL OF TECHNOLOGY

[0004] The problem solved by this invention is that traditionally, embedded parts for recessed luminaires in frame-and-sheath suspended ceilings are threaded. Threaded connections have a significant drawback that impacts installation: the threads are not firmly fixed in the required position. The threaded connection's mobility during installation complicates the process of aligning all components of the suspended ceiling surface into a single, level, horizontal plane. This shifting (wobbling) of embedded parts during alignment and painting (finishing) can lead to errors, resulting in parts of the embedded part protruding from the suspended ceiling surface, or the luminaire being installed unevenly (at an angle).Moreover, such errors become noticeable after the work is completed, and adjusting the position of the light fixture when the putty dries and "seals" the light fixture's mounting hole means completely removing the fixture's mounting point or adjusting its vertical position, which leads to unstable installation. This will become clear from the following: frame-and-sheathing structures (commonly known as "gypsum board ceilings") are characterized by a metal frame made of guides and ceiling profiles, forming a frame structure around the perimeter of the main ceiling (the room ceiling), or its 1.

[0005] SUBSTITUTE SHEET (RULE 26) parts, and sheathing sheets (gypsum fiber or plasterboard, but not limited to) placed on a metal frame, which are sewn to the metal frame from below, forming the suspended ceiling plane. Next, a decorative finishing layer is applied to the sheathing sheets, including putty compounds, fiberglass lining, etc., and the final finishing (painting, wallpapering, or other surface decoration). Recessed light fittings are installed after the suspended ceiling plane is formed, but before the decorative finishing. The putty compounds conceal all visible details, and after finishing, only a hole with a "nest" for the light fitting remains on the surface.Accordingly, when installing the luminaire housing into the "nest" formed by the embedded part, it is necessary to ensure a rigid connection between its parts. Misalignment will damage the decorative finish layer, and adjusting it entails both additional labor and expense, as well as time-consuming rectification, which requires additional cleaning, sealing, and painting of the surface. This problem can be solved by incorporating special fasteners into the embedded part; however, this complicates the installation and precludes the use of such an expensive and complex product as a consumable. Furthermore, due to its complexity, both installation and dismantling of such a structure not only requires additional knowledge from the installer but also additional manipulations.

[0006] Another issue that must be addressed when installing the embedded part is the dependence on the thickness of the sheet sheathing. For example, for ceilings, sheets with a thickness of 9 mm are used in one layer, 18 mm in two layers, respectively, and in some cases the sheathing thickness can be as thick as 24 mm (Code of Design and Construction Rules SP 163.1325800.2014. Structures using gypsum board and gypsum fiber sheets. Design and Installation Rules). Therefore, it is necessary to ensure 2

[0007] SUBSTITUTE SHEET (RULE 26) A reliable, rigid connection of the embedded parts for each value falling within the specified range. When reviewing the prior art, it should be emphasized that the claimed invention does not relate to luminaire housings. It should also be noted that the claimed technical solution does not apply to those in which the parts protrude from the suspended ceiling and / or have a frame concealing the connection.

[0008] A device for hanging an electric lamp from the ceiling is known from the prior art (patent GB1155126A, published.

[0009] June 18, 1969, application GB1885367A-OT April 24, 1967, MIC: F21V21 / 04), comprising a means for securing a luminaire within a hollow portion of the base, as well as channel-type clamps capable of resting on the inner surface of the ceiling when the device is installed therein, thereby providing support for the luminaire. A disadvantage of this alternative is that it lacks the ability to adjust the luminaire's height relative to the ceiling plane and has a complex design. Furthermore, this alternative does not meet modern requirements for integrating lighting equipment into suspended ceilings, the most important of which is the "invisibility" of the embedded mounting parts.

[0010] The "Zero" mounting kit from Technolight (source: https: / / technolight.ru / products / interernyi-svet / dot-220v / montaznyi-komplekt-zero / 40001-89search=zero) is designed as an embedded part comprising a support and mounting portion. The support portion is designed to rest on the inner surface of the ceiling, thanks to perforated "wings," while the mounting portion is designed to accommodate a luminaire. The embedded parts are designed to be mated via a threaded connection. As noted above, a threaded connection has a significant drawback: the threads do not provide a rigid lock in the required position.

[0011] 3

[0012] SUBSTITUTE SHEET (RULE 26) To the above, we can add a well-known recessed ring analogue from the company "Modular Lighting Instruments" (source: https: / / www.supermodular.com / en / products / recessed-ring-o50-p-52334 / ?pageSize9862_Lister=10), which is similarly designed as an embedded part including a support and mounting parts. The support part is designed to rest on the inner surface of the ceiling, and the mounting part is designed to accommodate a luminaire. The parts of the embedded part are designed to be mated by means of a threaded connection. It differs from the previously considered analogue "Mounting Kit "Zero"" in that the support part is designed as two mating elements of the mounting ring and thin "wings" in the form of an aluminum perforated panel. Nevertheless, the shortcomings that were noted above and revealed the problem of the prior art are also true for this source.As already mentioned above, the threaded connection has a drawback, which is the lack of rigid fixation of the thread in the required position.

[0013] In addition to the above, the "Putty Insert" product from Georg Bechter Licht (source: https: / / georgbechterlicht.at / filler-inset-68-28 / aO-en#Slides / 4) is also worth mentioning. This device can be used as a base for a large number of light sources, as it allows for creating openings in the suspended ceiling surface with different diameters, from the minimum for suspension to the maximum for luminaire housings. The insert is designed as a built-in module with an adjustable bayonet system and includes a protective cover. The insert's thickness is 12.5 mm - commensurate with the standard thickness of the sheathing sheet. The disadvantages of this technical solution, as with the similar ones mentioned above, include the lack of freedom from cladding thickness. In addition, the wide "spread" in the connection of light sources (changes in the diameter of the opening in the supporting part) makes it impossible to implement a high-quality solution for the specified housing parameters.

[0014] REPLACEMENT SHEET (RULE 26) of the lamp and requires additional manipulation to securely hold it in the hole of the putty insert.

[0015] The closest prototype to the claimed invention, in the author's opinion, is a recessed ceiling luminaire (patent RU217243U1, published on March 23, 2023, application 2023103198 dated February 14, 2023, IPC: F21S 8 / 04; F21V 21 / 04). The choice of prototype does not negate the previously stated fact that the claimed technical solution is not a luminaire itself, since the author has chosen a part of a known solution as the closest solution, namely, an embedded part formed by the base box and the movable element box, which, in the interpretation of the claimed invention, are the supporting and mounting parts of the embedded part of the luminaire, respectively. The supporting part is designed to rest on the inner surface of the ceiling by means of flanges - in the context of the invention, plates forming "wings". The mounting part includes internal annular projections with passages for placing and securing the luminaire to the embedded part and its positioning relative to the surface of the suspended ceiling.The embedded parts are designed to be mated using a threaded connection, the profile of which is formed on the inner surface of the bore of the support part and, correspondingly, the outer surface of the mounting part. To stabilize the embedded parts relative to each other and, consequently, the luminaire housing, the prototype uses two plastic inserts, two clamps, and mounting screws (self-tapping screws).

[0016] In addition to the lack of threaded connections, the prototype's drawbacks include the use of special fasteners in the embedded part design, which complicates it and prevents the use of such an expensive and complex product as a consumable. Furthermore, due to its complexity, installation of such a structure requires not only additional knowledge from the installer but also additional manipulations.

[0017] DISCLOSURE OF THE ESSENCE OF THE INVENTION

[0018] 5

[0019] SUBSTITUTE SHEET (RULE 26) Thus, the task directly follows from the state of the art, which is that in order to eliminate the shortcomings of the state of the art, a new solution is required for the mechanical connection of the parts of the embedded part of a built-in luminaire, simple both in design and during installation, and ensuring reliable fixation of the mating surfaces relative to each other in the working position.

[0020] The technical result of the group of inventions is, at a minimum, an expansion of the arsenal of means of fastening built-in luminaires into frame-and-sheathing structures available on the building materials market, and, at a maximum, an increase in the reliability of the embedded structure in terms of its mechanical connection, including simplification of the installation of such embedded parts in suspended ceilings of the frame-and-sheathing type.

[0021] For this purpose, the embedded part of a built-in light fitting including a mounting part in the form of a cylinder with annular open projections on its inner surface for inserting and securing the built-in light fitting, and a support part with panels for fastening to a frame-and-sheathing type suspended ceiling structure, made with the possibility of being combined with each other due to a mechanical connection between the mating surfaces of the cylinder of the mounting part and the opening of the support part, differs from the prototype in that the mechanical connection between the mating surfaces is formed by at least one pair of toothed elements having the shape of a comb in the cross-section of the mating surfaces of the embedded part, and performed on each mating surface symmetrically to their common longitudinal axis of the section, so that the combs of one mating surface are opposite the combs of the other mating surface, and the height of the combs of both parts, both the mounting and the support, is the same, while,the mounting part has a thickness in the thinnest area of ​​the cylinder wall not less than the height of the ridges, its outer diameter is commensurate with the diameter of the opening of the supporting part with a minimum permissible deviation to the smaller side,

[0022] 6

[0023] SUBSTITUTE SHEET (RULE 26) A mechanical connection formed by mating surfaces differs from the prototype in that it is provided with at least one pair of toothed elements having the shape of a comb in the cross-section of the mating surfaces and made on each mating surface symmetrically to their common longitudinal axis of the section, in such a way that the combs of one mating surface are opposite to the combs of the other mating surface, while the diameters of the mating surfaces are commensurate with each other with a minimum permissible deviation in the smaller direction.

[0024] The embedded part of the built-in luminaire is made of hard plastics and / or soft metals. The inner surface of the mounting part's cylinder is designed to accommodate a tool. To this end, it has a thin lower edge, forming a step on the inner surface of the cylinder, which is provided with slots symmetrical relative to the cylinder's axis, forming splines. The mounting part has an annular thickening along the diameter of the outer surface of the cylinder, which is provided with ribs, such as, but not limited to, teeth. The supporting part of the luminaire's embedded part is designed as a ring equipped with symmetrical plates, which, in turn, are made, for example, but not limited to, solid and equipped with needle-like protrusions along the lower surface and at least one longitudinal beveled stiffener along the upper surface. At least one side of one of the plates includes a relief zone along its outer edge.The mechanical connection is made in such a way that the mating surfaces have, at a minimum, a second pair of symmetrical toothed elements, which is located perpendicular to the first pair relative to the longitudinal axis of the section common to the mating surfaces.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 shows the parts of the built-in light fitting in disassembled form (bottom view);

[0027] 7

[0028] SUBSTITUTE SHEET (RULE 26) Fig. 2 shows the embedded part of the built-in light fixture in the starting position (top view);

[0029] Fig. 3 shows the embedded part of the built-in lamp in the working position (bottom view);

[0030] Fig. 4 shows the embedded part of the built-in lamp in an isometric view of the assembly (top view);

[0031] Fig. 5 and 6 show a schematic design - a built-in light fitting embedded in the sheet sheathing of a frame-sheathing type suspended ceiling (use of the invention for its intended purpose).

[0032] IMPLEMENTATION OF THE INVENTION

[0033] The embedded part of a built-in light fitting (according to any of the figures) is similar to the prototype in that it is similarly designed in the form of two parts: a mounting part 1 in the form of a cylinder 2 with annular open projections 3 for accommodating a built-in light fitting (not shown in the figure), the fastening elements of which are inserted into grooves 4 formed by said projections and are fixed by a rotating movement on said projections 3 in the embedded part, and a support part 5 of an inclusive panel 6 for fastening to a frame-and-sheathing type suspended ceiling structure. Moreover, both parts, mounting part 1 and supporting part 5, are designed with the possibility of being aligned with each other due to a mechanical connection between the surfaces 7 of the cylinder 2 of mounting part 1 and the opening 8 9 of supporting part 5.

[0034] As already stated, the requirement for the invention is the reliable fixation of the parts of the embedded part of the built-in luminaire in the working position, namely, the mounting part 1 relative to the supporting part 5, or, in other words, the cylinder 2 of the mounting part in the opening 9 of the supporting part 5, forming a mechanical connection between themselves when their surfaces 7 and 8 are mated. The mechanical connection between the mating surfaces 7 and 8, in an average form, can be represented as a connection with tension between radially located elements. Reliable fixation is ensured by a connection by means of at least one pair of toothed elements 10

[0035] 8

[0036] SUBSTITUTE SHEET (RULE 26) (designated so for both parts, since they form one mechanical connection), forming the inner surface 8 of the opening 9 of the supporting 5 part and the outer surface 7 of the cylinder 2 of the mounting 1 part. The toothed elements 10 in the cross-section of the embedded part have the shape of a ridge 11 (illustrated in Fig. 2) in the cross-section of the mating surfaces. Moreover, the ridges 11 of the mating surfaces 7 and 8 are made on each such surface symmetrically to the longitudinal axis of the embedded part section and opposite to each other to ensure a connection with tension. When turning the mentioned parts (spreading the combs 11) with force, the embedded part of the built-in lamp moves from the starting position (Fig. 2) to the working position (Fig. 3) due to the difference in the thickness of the surfaces 7 and 8 formed by the combs 11 of the toothed elements 10 that form the mechanical connection, i.e. from smaller to larger.When spreading the combs 11 and applying force, the embedded parts are securely fixed, clamping relative to each other. Moreover, the greater the force applied during rotation, the stronger the connection (clearly visible in Fig. 3). It should be noted that, empirically, it has been found that in the embedded part of a built-in luminaire, it is advisable to use two pairs of toothed elements 10, the second of which is located perpendicular to the first pair. That is, the number of combs 11 depends on the tension required between the mating surfaces 7 and 8. Such a connection can be easily adjusted during installation, if necessary, before installing the embedded parts into their working position.First, spread the ridges 11 apart with slight force, securing the parts of the embedded part relative to each other. Then, with a slight reverse movement (bringing the ridges 11 together), adjust the position by moving the cylinder 2 of the mounting part 1 up and down, bringing the lower edge of the embedded part level with the suspended ceiling surface (as shown in Figs. 5 and 6). This gives this technical solution an advantage over the use of special fasteners in the design, which requires 9 to adjust the position.

[0037] SUBSTITUTE SHEET (RULE 26) loosen the screws, move the ring to the required position and tighten the screws again, that is, not only simplifies the installation, but also allows you to eliminate errors in installing “level” on the surface of the suspended ceiling, since the operations are carried out overhanging.

[0038] In addition to the above, the height of all ridges 11 is the same or otherwise repeating, and the outer diameter of cylinder 2 of mounting part 1 is commensurate with the diameter of opening 9 of support part 5 with a minimum permissible deviation to the smaller side (clearly visible from Fig. 2), thus providing a backlash for unimpeded or otherwise free insertion of cylinder 2 of mounting part 1 into opening 9 of support part 5 and its retention until the lamp insert is transferred to the working position illustrated in Fig. 3. Due to the fact that the outer diameter of cylinder 2 is slightly smaller than the diameter of opening 9, and the height of ridges 11 is the same, in the starting position, due to such backlash, mounting part 1 freely moves up and down to the required height relative to support part 5, but does not scroll without the application of force.This connection is equally effective when secured in the central portion of cylinder 2 of mounting part 1 as well as at its edges, thereby freeing the embedded part of the built-in luminaire from the thickness of sheet metal sheathing 12 and allowing it to be used within its full range. This mechanical connection is effective when constructing the embedded part of the built-in luminaire (or its parts) from both hard plastics and soft metals, i.e., materials with a certain degree of ductility. To eliminate the effects of compression during the connection of the embedded part parts of the built-in luminaire and deformation of the diameter of the inner surface of cylinder 2 of mounting part 1, which affects the placement of the luminaire housing within the embedded part, the thickness of the embedded part in the thinnest region 13 of the wall of cylinder 2 is no less than the height of the ridges 11, as illustrated in Fig. 4 (compensation for material ductility).

[0039] 10

[0040] SUBSTITUTE SHEET (RULE 26) Since the embedded part of the built-in light fitting must be built into the plane of the suspended ceiling and must not protrude beyond the surface of the sheet cladding 12, it is possible to effectively fix it by hand, especially along the lower edge of the cylinder 2 of the mounting part 1, but this is quite problematic. Therefore, in order to achieve the necessary forces, when connecting the parts of the embedded part of the built-in light fitting, a tool is used, and the inner surface 14 of the cylinder 2 of the mounting part 1 is made with the possibility of inserting it (illustrated in Fig. 3 and indicated further in Fig. 4). This possibility of inserting the tool is ensured by the fact that the mounting part 1 has a thin lower edge 15, forming a step 16 on the inner surface 14 of the cylinder 2. The step 16, in turn, is made with slots 17 symmetrical with respect to the axis of the cylinder, forming splines for the tool.To check the correct installation level after turning the tool, the step 16 is made with two pairs of such slots 17 symmetrical with respect to the cylinder axis (which is clearly visible from Fig. 3). The step 16 is also intended for "recessing" the luminaire housing into the same plane with the thin lower edge 15 of the mounting part 1 and, accordingly, the surface of the sheet sheathing 12, so that parts of the luminaire's embedded part and parts of the luminaire itself are not visible on the plane of the suspended ceiling. As a tool, one can use, for example, a spatula in the form of a trowel consisting of a plate and (possibly, but not necessarily) a handle, the main requirement for the tool is the compatibility of the plate with the above-mentioned splines and the correspondence of the plate width to the inner diameter of the cylinder 2 of the mounting part 1 and its splines. Compensation for the thin lower edge 15 of the mounting part 1 is achieved due to the annular thickening 18 along the diameter of the outer surface of the cylinder 2 of the mounting part 1 (illustrated in Fig.1), which, in turn, is provided with ribs 19 (similar to the teeth of a gear and wheel of a gear mechanism). This ensures, firstly, the extreme lower position of the parts of the embedded part 11.

[0041] SUBSTITUTE SHEET (RULE 26) of the lamp relative to each other (cylinder 2 of the mounting part 1 does not fall into the hole 9 of the supporting part 5), and, secondly, high-quality adhesion of the lamp’s embedded part with finishing compounds - putty, due to the increase in the adhesion area of ​​the finishing compounds.

[0042] The supporting part 1 of the embedded part of the built-in lamp is made as shown in the figures in the form of a ring with symmetrical plates 6. In order to simplify the installation and prevent the displacement of the supporting part 1 during its implementation, namely, when fastening the embedded part in the place where the lamp is located, its plates 6 forming the “wings” are made, for example, but not limited to, solid and provided along the lower surface (as shown in Fig. 1 and 6) with needle-shaped protrusions 20, mainly in the place of fastening with self-tapping screws, and along the upper surface with at least one longitudinal beveled stiffening rib 21 (Fig. 2, 4 and 6), the height of which is maximum at the place of adjoining the ring forming the opening 9 of the supporting part 5, and at least one relief (rough) zone 22 along the outer edge of at least one of the sides of one of the plates 6 of the supporting part 5.In this manner, firstly, secure fixation of the supporting portion 5 to the sheathing sheet 12 is ensured, when the needle-shaped projections 20, due to the pressure on the plate 6, fix it, as shown in Fig. 6, preventing rotation and displacement "from the screw." Secondly, the stiffening ribs 21 prevent it (plate 6) from bending "following" the screw. Thirdly, plate 6 is securely held by the fingers, since the relief zone 22 has an anti-slip effect. Thus, the installer's manipulations in placing the embedded part of the built-in luminaire are significantly simplified, and the design of such an embedded part, despite its simplicity, has increased reliability properties.

[0043] An example of the use of a built-in lamp in accordance with the claimed technical solution, which allows for a sufficient demonstration of the advantages of the invention.

[0044] 12

[0045] SUBSTITUTE SHEET (RULE 26) The design of a frame-and-sheathing suspended ceiling (Code of Practice for Design and Construction SP 163.1325800.2014. Structures Using Gypsum Board and Gypsum Fiber Sheets. Design and Installation Rules) includes a metal framework consisting of guides and ceiling profiles assembled together to form a frame structure. This frame structure is attached to the ceiling of the room using hangers. The design of a frame-and-sheathing suspended ceiling also includes sheathing sheets 12, such as gypsum board and gypsum fiber sheets, which are attached to the bottom of the frame structure and form the surface of the suspended ceiling.

[0046] The luminaire is installed as follows. A hole of the desired diameter for the embedded part is cut into the hemmed sheathing sheets using a special tool, such as a hole saw (a cylindrical metal bit with a cutting edge on the working part). Alternatively, the hole can be created manually, for example, by cutting the sheet with a special knife. The installer grasps the embedded part of the built-in luminaire by the relief area 22 of panel 6 and inserts the symmetrical plate 6 and then the entire support section 5 into the resulting hole. With one hand, they hold plate 6 over sheathing sheet 12, pressing them together, while with the other hand, using a special tool (such as, but not limited to, a screwdriver), they tighten a screw from the bottom of the sheet.The relief zone 22 securely holds the embedded part in the required position, while the stiffening ribs 21 prevent plate 6 from bending upward under the pressure of the screw, allowing for precise positioning of the supporting portion 5 of the embedded part relative to the opening in sheet cladding 12. When screwed in, the screw presses plate 6 against sheet cladding 12, and the needle-like projections 20 pierce the surface of the sheet and "bite" into the surface of sheet cladding 12, securely holding plate 6 in place. The installer then secures plate 6, which is symmetrical to the aforementioned plate, and thus supports part 5. The resulting support portion 13.

[0047] SUBSTITUTE SHEET (RULE 26) the embedded part is securely fixed exactly in the location of the built-in light fitting.

[0048] Next, the parts of the built-in luminaire's embedded part are connected. To do this, the installer places cylinder 2 of mounting part 1 into hole 9 of the ring of support part 5, aligning their surfaces 7 and 8 to form a mechanical connection between the toothed elements 10. Next, using a slight amount of force, spread the combs 11 by hand, eliminating the play between the outer diameter of cylinder 2 of mounting part 1 and the diameter of hole 9 of support part 5, securing the two embedded parts relative to each other.

[0049] The built-in light fixture's insert is leveled. To do this, insert the blade into the tool slots formed by the symmetrical slots 17 in the step 16 of the inner surface 14, and, with a slight reverse movement, as described above, bring the ridges 11 together to adjust the position by moving the cylinder 2 up and down through the opening 9, aligning the thin lower edge 15 with the suspended ceiling surface (as shown in Figs. 5 and 6). This can be accomplished either by using an additional tool or by using the tool already in use.The installation “flush” with the surface of the sheet cladding 12 is carried out, for example, but not limited to, by means of special limiters of the tool plate, which, protruding to a width greater than the tool plate itself, allow the height of the thin lower edge 15 to be limited relative to the plane of the suspended ceiling and, at the same time, by exceeding their size of the diameter of the opening, resting against the surface of the sheet cladding 12, to align the lower edge of the embedded part along the entire diameter of the opening.

[0050] Fixing the parts of the built-in light fitting in the working position. After the installer has aligned the thin bottom edge 15 flush with the sheathing sheets 12, the tool is turned, spreading the toothed elements 10 apart. The installer applies the necessary force and, while spreading the ridges 11, the built-in light fitting 14

[0051] The replacement sheet (rule 26) moves from the starting position (Fig. 2) to the working position (Fig. 3). Due to the difference in the thickness of the surfaces 7 and 8 formed by the ridges 11, a reliable mechanical connection is formed at least along two sides or, as shown in the figures, but not limited to, along four sides of the two pairs of toothed elements 10 and the parts of the embedded part are securely fixed, connecting with tension relative to each other. In this case, the inner surface of the cylinder 2 is not deformed in diameter and the mechanical connection does not change its geometry due to the fact that the thinnest area 13 of the wall of the cylinder 2 has a thickness of at least the height of the ridges 11. This allows the embedded part of the built-in luminaire to be manufactured from hard plastics and / or soft metals, i.e. materials with a certain plasticity, which, in turn, due to this plasticity, increases the efficiency of the said mechanical connection. In Fig.3 it is clearly seen that, due to the symmetry and opposition of the ridges 11, the gaps between the mating surfaces 7 and 8 of the mounting 1 and supporting 5 parts, respectively, are minimized as much as possible, which indicates high-quality and reliable fixation and the effectiveness of the invention.

[0052] Finishing work. After the installer has completed the final fixation, creating a mechanical connection between the mounting 1 and supporting 5 parts, the gap between the annular thickening 18 along the outer surface diameter of cylinder 2 and the edges of the opening in sheet cladding 12 is sealed. Using a spatula and putty, and, if necessary, a painter's mesh (serpyanka), the installer fills all surface defects, forming the suspended ceiling plane. Furthermore, the ribs 19 projecting outward along the entire annular thickening 18 increase the adhesion area of ​​the finishing compounds to the embedded part of the recessed luminaire and also provide additional reinforcement to the gap between the annular thickening 18 along the outer surface diameter of cylinder 2 and the edges of the opening in sheet cladding 12, improving the adhesion of the embedded part to the finishing compounds.

[0053] 15

[0054] SUBSTITUTE SHEET (RULE 26) Recessed Lighting Fixture. As a result of the above steps, the embedded part is embedded into the suspended ceiling plane and protrudes beyond the surface of the sheet metal sheathing 12. Only the inner surface of cylinder 2 of mounting part 1 remains visible on the suspended ceiling plane. The installer connects the recessed light to the power line in the traditional manner and places its housing in the embedded part. The fastening elements of the light housing are inserted into grooves 4 formed by the open projections 3 of cylinder 2 of mounting part 1 and, with a rotating motion, are secured to the said projections 3 in the embedded part of the recessed light.

[0055] The above-mentioned method solves the problem of eliminating the shortcomings of the state of the art, and the proposed simple design of the embedded part and the claimed mechanical connection not only simplify the installation of built-in lamps in frame-and-sheathing structures of suspended ceilings, but also ensures reliable fixation of the embedded parts relative to each other in the working position, forming a high-quality and effective connection between them.

[0056] 16

[0057] SUBSTITUTE SHEET (RULE 26)

Claims

FORMULA 1. A built-in light fitting embedded part comprising a mounting part in the form of a cylinder with annular open projections on its inner surface for inserting and securing the built-in light fitting, and a support part with panels for securing to a frame-and-sheathing type suspended ceiling structure, configured to be aligned with each other by means of a mechanical connection between the mating surfaces of the mounting part cylinder and the opening of the support part, characterized in that the mechanical connections are formed by toothed elements having the shape of a comb in the cross-section of the embedded part, wherein the height of the combs of both parts, the mounting and the support, is the same, while the mounting part has a thickness in the thinnest area of ​​the cylinder wall not less than the height of the combs, its outer diameter is commensurate with the diameter of the opening of the support part with a minimum permissible deviation to the smaller side.

2. A built-in light fitting according to item 1, distinguished by the fact that it is made of hard plastic.

3. A built-in light fitting according to item 1, characterized in that it is made of soft metal.

4. A built-in light fitting according to item 1, characterized in that it is made from a combination of hard plastic and soft metal.

5. A built-in light fitting according to item 1, characterized in that the inner surface of the cylinder of the mounting part is designed to allow insertion of a tool.

6. A built-in light fitting according to item 5, characterized in that the ability to insert a tool is ensured by the fact that the inner surface of the cylinder of the mounting part is made with a thin lower edge, forming a step equipped with slots symmetrical relative to the axis of the cylinder, forming splines.

7. A built-in light fitting according to item 6, characterized in that the mounting part has an annular thickening along the diameter of the outer surface of the cylinder.

8. A built-in light fitting according to item 7, characterized in that the annular thickening of the cylinder of the mounting part is provided with ribs in the form of teeth.

9. A built-in light fitting according to item 1, characterized in that the supporting part is made in the form of a ring equipped with symmetrical plates.

10. A built-in light fitting according to item 1, characterized in that the plates of the supporting part are made solid.

11. A built-in light fitting according to item 1, characterized in that the plates of the support part are provided with needle-shaped protrusions on the lower surface.

12. A built-in light fitting according to item 1, characterized in that the plates of the supporting part are provided with at least one beveled longitudinal stiffening rib.

13. A built-in light fitting according to item 1, characterized in that at least one side of one of the plates of the supporting part includes a relief zone along its outer edge.

14. A mechanical connection formed by mating surfaces, characterized in that it is provided with at least one pair of toothed elements having the shape of a comb in the cross-section of the mating surfaces, and made on each mating surface symmetrically to their common longitudinal axis of the section, in such a way that the combs of one mating surface are opposite the combs of the other mating surface, while the diameters of the mating surfaces are commensurate with each other with a minimum permissible deviation in the smaller direction.

15. A mechanical connection according to claim 14, characterized in that the mating surfaces have at least a second pair of symmetrical toothed elements, which is located perpendicular to the first pair relative to the longitudinal axis of the section common to the mating surfaces.

Images