RU226276U1 - Plastic box for low-voltage complete devices - Google Patents

Abstract

The utility model relates to electrical engineering. A plastic box for low-voltage complete devices contains a base in the form of an open tray with side walls and a rectangular bottom, in which through holes are made for fastening elements to secure the box to the supporting surface, a cover with an inspection window, which is removably fixed to the base, and a door mounted on rotary hinges on the lid. In this case, the rotary hinges are made on two opposite sides of the lid and the door, and each rotary hinge includes a hemispherical protrusion made on the bracket extending from the lid and a bracket extending from the door with a depression in the shape of a hemisphere to accommodate the said protrusion. On the door, on each side of the location of the rotary hinges, there is a handle for opening the door by removing the projections from the recesses on the side of this handle and rotating the door around the projections on the other side of the door. 11 ill.

Description

The utility model relates to electrical engineering, in particular to the designs of empty box-shaped shells for housing low-voltage complete distribution and control devices.

As is known, distribution cabinets and, more generally, electrical distribution panels consist essentially of a box or container designed to contain a number of electrical devices and components.

From a structural point of view, such boxes must be designed to guarantee a sufficient degree of protection for the devices contained in it, for example with a degree of protection of IP40, IP55, etc., as defined by national and international standards and regulations. For this purpose, known distribution cabinets or mounting boxes of the type to which the present utility model belongs have a body/cabinet of an appropriate shape, formed as one piece or as two or more pieces, firmly attached to each other and made of electrically insulating plastics, and an opening/closing cover, which is hung on the door, which in turn is connected to the body.

Although existing mounting boxes adequately perform all the functions required of them, there are still some aspects that can be further improved, in particular, such aspects include the ability to easily and quickly access the contents of the box, even if the box is mounted in a hard-to-reach location. For example, known designs of plastic housings for distribution boards are made with a plastic door, the locking of which is carried out due to the friction force formed between the wall of the cover and the protrusions on the door. But in this case, the door has a fixed position of the door hinges, which makes it impossible to change the direction of opening the door without first re-hanging (turning over) the housing cover together with the door or reinstalling the door hinges.

Thus, a plastic box is known for housing low-voltage complete devices, containing a base in the form of an open tray with side walls and a bottom on which mounting elements for low-voltage complete devices are fixed, a door rotatably connected to one side wall of the tray and having a locking unit for connection when closing with another opposite side wall (RU 2754925, Н02В1/40, published 09/08/2021).

This decision was made as a prototype for the declared object.

This source uses a traditional solution for securing the door: it is pivotally mounted relative to one side wall of the base, that is, it always opens only in one direction.

Regulations for electrical switchboard boxes in accordance with clause 7.1.29 of the PUE “Doors of electrical switchboard rooms must open outwards” (clause 14.1 SP 256.1325800.2016 “Electrical installations of residential and public buildings. Design and installation rules”: The SNiP does not specify anywhere exactly how to what distance from the walls, from the passages it should be installed, in which direction the door should open. The lack of regulatory regulation of the location of the box with electrical devices leads to the fact that sometimes the box is placed in inaccessible places where opening the door can create inconvenience for the installer and limit him. access to electrical devices, for example, if the box is located in a corner niche and the door opens outward from left to right.

This is especially important for boxes in which the cavity of the box with electrical devices is closed with a removable cover (attached with screws/bolts), and the cover is closed by rotating to one side with a door. When working with electrical devices, it is advisable not to have a door on the frame at all (it tends to return on its hinges spontaneously from an open position to a closed one). If there is no door, the installer can easily dismantle the cover and gain free access to the contents of the box. But modern distribution board boxes do not have the ability to completely dismantle the door or remove it during technological work and do not provide a means of holding the door in its fully open position, including turning it or opening it 180°.

This utility model is aimed at achieving a technical result, which consists in providing the ability to open the door on both sides without first reinstalling the cover, while complying with the requirement to reliably hold the door in the closed position.

The specified technical result is achieved by the fact that the plastic box for low-voltage complete devices contains a base in the form of an open tray with side walls and a rectangular bottom with elements corresponding to the fastening elements for securing the box to the supporting surface, a cover with an inspection window, which is removably fixed to the base, and a door mounted on rotary hinges on the lid, the rotary hinges are made on two opposite sides of the lid and the door, and each rotary hinge includes a protrusion in the shape of a hemisphere made on the bracket extending from the lid, and a bracket extending from the door with a depression in the shape a hemisphere to accommodate said protrusion in it, the protrusions are directed along the indicated sides of the lid, and on the door, on each side of the location of the rotary hinges, there is a handle for opening the door by removing the protrusions from the recesses on the side of this handle and rotating the door around the protrusions on the other side of the door.

In this case, a groove can be made in the box in the lid, on one side wall of which a hemispherical protrusion is placed, and the width of the groove is greater than the sum of the height of this protrusion and the thickness of the bracket on the door, or a hemispherical protrusion on the lid can be placed on the bracket .

These features are essential and are interrelated to form a stable set of essential features sufficient to obtain the required technical result.

This utility model is illustrated by a specific example of execution, which, however, is not the only possible one, but clearly demonstrates the possibility of achieving the required technical result.

In fig. 1 - general view of the box from a 3/4 perspective from the front side, the first example of execution;

fig. 2 - view of the box according to FIG. 1 from the front side in plan; fig. 3 - general view of the box in 3/4 perspective from the front side, second example of execution;

fig. 4 - view of the box according to FIG. 3 on top;

fig. 5 - the first version of the hinge for a hinged door, the door is closed;

fig. 6 - the same as in Fig. 5, the door is open;

fig. 7 - the same as in Fig. 5, partial section at the location of the loop;

fig. 8 - second version of the hinge for a built-in door, the door is closed;

fig. 9 - the same as in Fig. 8, door open;

fig. 10 - the same as in Fig. 8, partial section at the location of the loop;

fig. 11 - demonstration of opening the door.

According to this utility model, we consider the design of a box 1 fixed to a vertical wall surface, used to accommodate low-voltage complete distribution and control devices (Fig. 1-4).

As part of the submitted application, the design of a plastic box for housing low-voltage complete devices is considered, which contains a base 1 in the form of an open tray with side walls 2 and a rectangular bottom, in which there are counter elements for fasteners to secure the box on the supporting surface (for example, through holes ). The box also contains a cover 3 with a viewing window, which is removably fixed to the base, and a door 4 mounted on rotary hinges 5 on the cover.

The box (base 1) is made of electrically insulating impact-resistant polymer material (UPS 825 L polystyrene or ABS plastic) and is obtained by molding, which makes it possible to ensure uniformity of the material structure and obtain thin shaped profiles. The cover is made of transparent/opaque impact-resistant plastic such as ABS or polystyrene or polycarbonate (vandal-proof). The door is made of similar materials. In this case, the lid and door are subject to the condition that the material from which they are made has the property of elastic deformation.

The lid is installed on the base of the box and secured with plastic screws 6. The door is installed on the lid on rotary hinges 5 with hemispherical structural elements (protrusions on the lid, recesses on the door). The door is opened by applying a pulling force in the area of the shaped recesses on one side of the door. At the same time, on the opposite side of the lid, the door hinges rotate on the spherical protrusions of the lid, holding on to them due to elastic deformation forces. When the door is closed, the hinges snap into place and are secured to the spherical protrusions of the lid.

The technical result of the utility model is achieved by introducing into the design of the lid and door symmetrical structural elements that simultaneously serve as door hinges and devices for fixing the door in the closed position. This allows you to open the door from both the left and right sides of the housing at the user’s request without first changing the relative position of the housing parts.

To achieve this result, rotary hinges 5 are made on two opposite sides of the lid and door (which extend along the height of the attached box), and each rotary hinge 5 includes a hemispherical protrusion 7 made on the lid 3, and a bracket 8 extending from the door 4 with a depression 9 having the shape of a hemisphere to accommodate the specified protrusion. On the sides of the lid, projections are directed along said sides of the lid. These projections form the axes around which the door rotates.

On the door, on each side of the location of the rotary hinges 5, there is a handle 10 for opening the door 4 due to the fact that the installer pulls the door by the handle and removes the protrusions from the recesses on the side of this handle. After the elements with the recesses come out of the protrusions, the door rotates around the protrusions on the other side doors (Fig. 11). When the element carrying the depression jumps off the protrusion, it is elastically pressed out, which is possible since the contact surface in the loop is made spherical. That is, it is a fragment of a second-order surface on which the applied force is decomposed into two components in the system of coordinate axes. After leaving the protrusion, the element with the depression returns to its original position due to the elastic component of the polymer material.

If it is necessary to completely remove the cover, the installer pulls two handles (simultaneously or in turn). The specific design of the handle (protruding or recessed) is not essential to achieve the required technical result.

Within the framework of the present utility model, the rotary hinges can be made in various ways. In fig. Figure 5-7 shows an example of a rotary hinge for a hinged door. The cover has a groove 11, on one side wall of which there is a protrusion 7 in the shape of a hemisphere. The depression is formed on the bracket 8, which is an integral part of the door. The bracket is inserted into the groove, bent under the action of elastic deformation of the material and settled with a depression on the hemispherical protrusion. In order to fit a recess onto a protrusion or in order to remove a bracket from a protrusion due to the elasticity of the material, it is necessary that the width of the groove (the distance between the side walls of the groove) be greater than the sum of the height of this protrusion and the thickness of the bracket on the door in the area located outside the recess . The door is held on the projections due to the elastic component of the bracket material and due to the fact that on each side of the box the projections are located with the opposite direction of the vertices or with the opposite direction of the vertices. And in fig. 8-10 shows an example of a rotary hinge for a built-in door. In this example, the recess is made on the door bracket, and the protrusion is made on the lid bracket.

The box can be made hinged, as shown in Fig. 1 and 2, that is, it is fixed with fasteners on a supporting vertical surface (for example, a wall), or built into a niche in the wall, as shown in Fig. 3 and 4.

The utility model is industrially applicable and can be manufactured using technologies for the production of polymer boxes for electrical devices. Allows for the possibility of opening the door on both sides without first reinstalling the hinges of the lid and door, subject to the requirement to reliably hold the door in the closed position.

Claims (3)

1. A plastic box for low-voltage complete devices, characterized in that it contains a base in the form of an open tray with side walls and a rectangular bottom with elements corresponding to the fastening elements for securing the box to the supporting surface, a cover with an inspection window, which is removably fixed to the base, and a door mounted on rotary hinges on the lid, the rotary hinges are made on two opposite sides of the lid and the door, and each rotary hinge includes a hemispherical protrusion made on the lid and a bracket extending from the door with a hemispherical depression for placement in of the said protrusion, the protrusions are directed along the indicated sides of the cover, and on the door, on each side of the location of the rotary hinges, there is a handle for opening the door by removing the protrusions from the recesses on the side of this handle and rotating the door around the protrusions on the other side of the door. 2. The box according to claim 1, characterized in that there is a groove in the lid, on one side wall of which there is a protrusion in the shape of a hemisphere, and the width of the groove is greater than the sum of the height of this protrusion and the thickness of the bracket on the door. 3. The box according to claim 1, characterized in that on the lid a protrusion in the shape of a hemisphere is placed on a bracket.