RU188208U1 - RIGIDITY STRUCTURE ELEMENT - Google Patents

Abstract

The utility model is intended for its use in detachable joints of metal structures, mainly rack structures. It solves the problem of increasing the bearing capacity of the stiffener. The stiffener of the rack structure is characterized by a t-shape in projection onto the frontal plane and an l-shaped projection on the horizontal plane, made of a plate and has two upper branches extending in opposite directions from the axis of symmetry element, and one lower l-shaped cross-sectional branch extending at right angles to the upper branches. In each of these branches tiya with screw threads for means of screw connection of the stiffener with racks and shelves of the rack structure. Around the holes, stiffening ribs directed inside the stiffener are made, each of which has the shape of an annular collar located at right angles to the plane of the corresponding branch. Each hole is located inside the collar, on the inner surface of which a helical thread is made. In the angular zone of the stiffener formed by adjacent branch walls, an angular stiffener located in the zone of convergence of the walls of the lower g-shaped branch is made. A helical thread inside the collar is made in the form of a thread, the height h of each crest of which is selected within h = ( 0.5-0.7) t, where t is the collar wall thickness.

Description

This technical solution relates to means of detachable connection of structural elements, mainly rack structures, in which stiffeners are used to connect the racks to the shelves of the rack structure. The technical solution is intended for use in two-dimensional spatial structures formed by individual elements extending along the x, y coordinates. Such constructions in particular include furniture frames, shelving, building structures, reinforcing and supporting structures, as well as flat panels and furniture panels connected to each other by x, y coordinates. The technical solution presented in this description is designed primarily for its use in the construction of shelving for various purposes, as well as in the construction of furniture containing frames or furniture panels connected to each other.

Holders are known by means of which the shelf of the rack is attached to the racks by installing them in the nests of the racks, while the shelf is held by the holders with the possibility of changing the height of the racks. The holder has a truncated pyramidal shape and at least one face on which a recess or recess is made. The holder has vertical slots that allow you to squeeze it and tightly fix it in a shelf in order to connect with the rack. The system can be adapted for square and round racks (US 4852501 A, A47B 57/26, 08/01/1989).

Known rack, which includes many shelves. At least one support element and several engaging elements are connected to each other to support the shelf. At least one support element has at least one crest, and cutouts are defined in at least one crest. Each of the engaging elements is a curved tubular element. The support element passes through the engaging elements and the engagement elements engage with the recesses of at least one support element, and the shelves are supported on the engaging elements (US 2016015175 A1, A47B 57/34, 01.21.2016).

A device for connecting a storage rack, which is characterized by the presence of a base and grooves. The main structure is provided with a first surface, a second surface, a third surface and a diagonal plane, the first surface, the second surface and the third surface intersecting and vertically intersecting and further aligned with the diagonal plane to provide a basic structure for forming a right-angled triangle. Three groove structures are formed, respectively, on the first surface, the second surface and the third surface in a concave mode. The rack elements are connected using three structural grooves of each connecting device. The advantage of the connecting device is that the main structure is a triangle with increased adhesion strength (CN 204344590 U, F16B 5/00, 05/20/2015).

Stamped corners are known for connecting structural elements, each of which contains walls located at right angles, between which are stiffeners, made integral with the walls (Yandex, www.PANKYT.com. WWW.ugolki.kiew.ua, 2017). The stiffeners in the places of their transition into the walls of the corner create stress concentrations in these places due to the unsatisfactory shape of the transition points, which, as a rule, do not have radius curves. In cases where the transition points have radius curves, they are in the hazardous areas of the indicated concentrations from the point of view of the bending of the metal during stamping. From the patent documentation, knots of fastening elements to racks using intermediate fastening and connecting elements made in the form of angles are known (LU 47030A, 11.28.1964. RU 56138 U1, 09.10.2006. RU 30247U1, 06.27.2003. US 6202570A, 03.20.2001 US 5632389 A, 05.27.1997. RU 2376918 C1, 12/27/2009 and RU 178499 U1, 04/05/2018). Of the known, a close analogue to the stiffening element presented in this description is the stiffening element described in patent RU 178499 U1, 04/05/2018.

The prototype of the utility model is the patent RU 68258 U1, 11.27.2007, which presents the unit for attaching the shelf to the vertical racks of the metal rack and which includes at least one corner rack with perforation holes, a bracket and a shelf fixed to the rack by means of a bracket and threaded fasteners, characterized in that the bracket is made of a sheet blank by a technological operation of bending along the axis of symmetry, while the bracket has a pair of holes symmetrically located relative to the axis made in such a way that at least one pair of said symmetrically arranged holes includes one threaded and one through hole, and in the remaining pairs both holes are threaded, in turn, the shelf and the rack have through holes matching the holes of the bracket during installation.

The sheet blank of the bracket in the prototype has a T-shape. Bolts are used as threaded fasteners. The rack holes are made with equal vertical pitch. The through hole has a rectangular shape with rounded corners. Threaded holes are made by threading in pre-flanged through holes.

It is envisaged that in the particular case of the implementation of the bracket, its sheet blank has a T-shape with pairs of holes, while one pair of holes has one threaded hole and one through hole. This bracket is designed for use in heavy-duty shelving.

The common features presented in this description of the technical solution and the prototype are such signs that each stiffener (bracket in the prototype) of the rack structure is characterized by a t-shape in projection onto the frontal plane and an l-shaped projection on the horizontal plane made of plate having two upper branches extending in opposite directions from the axis of symmetry of the element, and one lower l-shaped cross-sectional branch extending at right angles to wearing to the upper branches, while in each of these branches holes are made with screw threads for screw connection of the stiffener with racks and shelves of the rack structure.

The description of the prototype contains information that in order to prevent the breakdown of the internal thread in the bracket during assembly of the rack, the threaded hole is made by threading a tap in a pre-flanged through hole. As follows from the description of the prototype, this embodiment provides the cutting of a larger number of threads, increases the reliability of the threaded connection, as well as the reliability of the entire structure as a whole. The description of the prototype does not disclose "threading in a pre-flanged through hole", does not disclose a "pre-flanged through hole" or "flanged through hole". In fact, the “flanged hole” is not disclosed and the limits of the numbers of “more turns of thread” are not indicated. Moreover, the description does not disclose on which side of the stiffening element the flanges of the flanged hole are located, and there is no reference to the source of information from which the “flanged hole” made in the stiffener would be known.

Thread cutting “in a through flanged hole” and a “large number” of thread turns are not design features, since these features are uncertain, which do not allow one to clearly understand where the thread is cut, which justifies the “large” number of thread turns. The prototype presents a partially unrealizable technical solution; in it, thread cutting “in a through flanged hole” with a “large number” of thread turns does not meet the requirements of industrial applicability.

Another disadvantage of the prototype is that in the area of the threaded hole (around it) on the walls of the stiffening element, stress concentrations are created when tightening the screws that deform the walls of the stiffening element around the hole, while the contact area of the joined surfaces is reduced, and the friction forces between the surfaces are reduced . As a result, the bearing capacity of such a screw connection is reduced, and the load from the shear force of the connection increases many times on the screw leg. With insufficient tightening force, such a connection is destroyed, and with excessive tension of the screw connection during the assembly of the rack, the insufficient bearing capacity of the threaded connection is revealed due to the lack of the number of threads.

As a result, the design of the stiffening element (bracket), presented in the prototype, does not meet the requirements of the applicability of the connection, excluding the use of bolted connections, and it also does not meet the requirements of the complexity of the assembly of the rack, the convenience of installation work, since it does not exclude the thread breakage of the screw connection and requires additional means to prevent breakdowns. Secondly, the design of the prototype does not meet the requirements for the bearing capacity of the stiffening element (bracket) due to the fact that the number of threads in the hole does not allow for the specified tension of the screw connection and due to friction forces the reliability of the connection of the elements of the rack, which also depends on the density the fit of the surfaces to be joined and their resistance to warping when tightened.

A common disadvantage of the prototype is the unsatisfactory bearing capacity of the stiffener (bracket in the prototype).

The technical result presented in this description of the stiffener of the rack structure is to increase the bearing capacity of the stiffener.

The technical result was obtained by the rigidity element of the rack structure, characterized by a t-shape in projection onto the frontal plane and an l-shaped projection on the horizontal plane, made of a plate, having two upper branches extending in opposite directions from the axis of symmetry of the element, and one lower cross-sectional l-shaped branch extending at right angles to the upper branches, with holes with screw bores made in each of these branches by means of means for screw connection of the stiffening element with racks and shelves of the rack structure, moreover, around the holes, stiffening ribs directed inside the stiffening element are made, each of which has the form of an annular collar located at right angles to the plane of the corresponding branch, with each hole located inside the collar, on the inner surface of which a helical thread is made, and in the angular zone of the stiffener formed by adjacent walls from etvleny is configured angular rib disposed in the zone of convergence of the walls of the lower L-shaped branch.

The screw-shaped thread inside the collar is made in the form of a thread, the height h of each crest of which is selected in the range h = (0.5-0.7) t, where t is the thickness of the collar wall.

In FIG. 1 shows a stiffener in a perspective view, a view from the inside of the element.

In FIG. 2 - frontal projection onto the stiffener from the inside of the element.

In FIG. 3 is a section BB in FIG. 2.

In FIG. 4 is a section GG in FIG. 2.

In FIG. 5 - stiffeners of the stiffener located inside the element, location A in FIG. 3.

In FIG. 6 - place B in FIG. four.

In FIG. 7 - a stiffening element in the working position, connected to the rack and shelf of the rack structure.

In FIG. 8 is a section EE in FIG. 7.

The rigidity element of the rack structure is an integral element of durable material with a given strength and rigidity. The element is characterized by a t-shape in the rear view, from the outside of the stiffener, in the projection onto the frontal plane (Fig. 1) and the l-shaped form in the top view in the projection onto the horizontal plane (Fig. 3). The stiffening element is predominantly stamped from a metal plate, has two upper branches 1 and 2, extending in opposite directions from the axis of symmetry 3 of the element, and one lower l-shaped cross section 4, extending at right angles to the upper branches.

In each of these branches, holes 5 are made with screw threads for screw connection of the stiffener with racks and shelves of the rack structure.

Around each hole 5 (Fig. 6), a stiffener is made in the form of an annular collar 6 (Fig. 5) directed to the inside of the stiffener, with the hole 5 located inside the collar 6 symmetrically with respect to the center of the collar 6. On each forming hole 5 surface 7 of the collar 6 is made screw-shaped thread 8 (Fig. 6), having a length of 9, sufficient to implement a given tensile force when screwing into a screw thread screw.

Screw threading in this description refers to any cutting of grooves and ridges on the forming surface of the hole, and the grooves and the ridges formed between them are located along a helical line (screw cutting of grooves for special screws, self-tapping screws or fasteners with standard fine thread). The thread 8 inside the collar 6 is preferably cut so that the height h of each thread comb is selected in the range: h = (0.5-0.7) t, where t is the wall thickness of the collar 6.

In the corner zone 10 of the stiffener (Fig. 5), formed by adjacent walls 11 and 12 of the lower l-shaped branch 4 adjacent to each other at right angles, a stiffener 13 is made in the form of an angular extrusion directed inside the stiffener. The stiffener 13 is located in the zone of convergence of the walls 11 and 12 of the lower L-shaped branch 4. The angular stiffener 13, as well as the stiffeners 6 in the form of collars, are located between the branches of the stiffener on its inner side. Their purpose is to increase the bearing capacity of the stiffness element and resistance to branch deformations during their tightening with screws during the assembly of the rack structure. The assembly of such a structure is carried out by connecting the stiffeners with racks 14 and shelves 16 of the rack structure, as shown in FIG. 7, which shows one stiffener, one rack and one shelf. In the assembly process, the connection of the shelves with racks is carried out by pinching flanges 15 of the shelf 16 between the walls of the rack 14 and the walls 11 and 12 of branches 1 and 2 of the stiffener. The walls of the rack 14, flanging 15 of the shelf and the walls 11 and 12 of the stiffener are attracted to each other during the indicated connection by means of 17 screw connections (screws) located in the holes 18 of the rack 14 and in the holes 5 of the stiffener having a screw thread.

The stiffener works as follows. In the working position, the stiffener is connected to the rack 14 (Fig. 7, 8) and the shelf 16 of the rack located screw means 17 of the connection in the holes 18 of the rack 14 and the holes 5 of the stiffener having a screw thread. In the indicated operating position, the stiffener perceives static and dynamic loads, moreover, it perceives static loads from the load located on the shelves 16, and it perceives dynamic loads during loading onto the rack construction of the load and its unloading. The stiffening element works together with the rack 14 and the shelf 16 of the rack structure, while the walls of the branches 1 and 2 (Fig. 7) and the walls 11 and 12 of the lower L-shaped branch 4 of the stiffener experience bending alternating loads that are associated with dynamic vibrations of the rack structure in the process of its operation. With such fluctuations, branches 1 and 2, as well as walls 11 and 12, due to stiffeners 6 and angular stiffener 13, provide increased resistance to loads, which eliminates distortions of the rack structure in a given load range. In the process of operation of the stiffening element, the stiffening rib 13 prevents the stiffener element 11 from moving closer and apart in the walls 11 and 12, which as a result allows you to maintain the design relative position of the racks and shelves of the rack structure and prevents its bias in diagonal directions. The stiffeners 6 during the operation of the rack structure resist bending of the walls of the stiffener in the areas of their pressing against the rack and shelf of the rack.

In the process, the stiffener provides a right angle to the rack structure, while the stiffener 13 and stiffeners 6 increase the resistance of the stiffener and reduce its deformation in hazardous areas - in the corner of the stiffener, as well as in places where the stiffener is attracted to the flanges 15 of the shelf 16 and to the walls 19 of the rack 14. Reducing the deformation of the branches of the stiffener allows you to keep within the specified limits the friction forces between the connected surfaces and the bearing capacity of the stiffener.

Increasing the load-bearing capacity of the stiffening element made it possible to reduce the displacements of the stiffening element from its design position and, accordingly, the stability of the design arrangement of shelving shelves on the racks of the rack, which ultimately made it possible to increase the stability of the rack structure and its safety.

By increasing the resistance of the branches of the stiffening element, the distortion of the branches of the stiffening element during tightening of the screws is excluded within the specified limits, the calculated forces of attraction of the abutting surfaces to each other and the calculated friction forces between them are provided, due to which the strength of the connection of the stiffening elements with the racks and shelves of the rack is increased.

Since the stiffening element has an increased load-bearing capacity, the stability of the rack structure, which is a high-risk structure, is significantly increased. The technical result (increasing the bearing capacity of the stiffening element of the rack structure) is achieved by the combination of the characteristics set forth in the formula. At the same time, the metal consumption of the assemblies of the rack structure was significantly reduced by eliminating nuts and washers from the joints _? and the complexity of assembling the rack structure.

Claims (2)

1. The rigidity element of the rack structure, characterized by a t-shaped projection on the frontal plane and an l-shaped projection on a horizontal plane made of a plate, having two upper branches extending in opposite directions from the axis of symmetry of the element, and one lower g -shaped cross section extending at right angles to the upper branches, with holes made in each of these branches with screw threads for screw connecting the stiffener with the racks and shelves of the rack structure, characterized in that around the holes there are stiffening ribs directed inside the stiffener, each of which has the shape of an annular collar located at right angles to the plane of the corresponding branch, with each hole located inside the collar, on the inner surface of which is screw-shaped, and in the corner zone of the stiffener formed by adjacent branch walls, An angular stiffener is located in the zone of convergence of the walls of the lower L-shaped branch. 2. The stiffener according to claim 1, characterized in that the helical thread inside the collar is made in the form of a thread, the height h of each crest of which is selected in the range h = (0.5-0.7) t, where t is the thickness of the collar wall.

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