SU1639613A1 - Process of box making - Google Patents

Abstract

The invention relates to the furniture industry, in particular to the manufacture of boxes. The purpose of the invention is to increase the rigidity of the structure and reliability in operation. The side, front and rear walls have a longitudinal groove for installing the bottom. In the manufacture, the side and rear walls are made nsornyf in the longitudinal direction. When assembling, the walls are installed with a convexity inside the box and when the bottom is installed, they are straightened. In the final box, the walls are spring-loaded bottom. providing rigidity to the structure. 4 Il.

Description

The invention relates to the production of furniture boxers and can be used in other branches of the national household in the manufacture of packaging and box products.

The aim of the invention is to increase the rigidity of the structure and reliability in operation.

Figure 1 presents the box assembled, axonometric; figure 2 - the same, disassembled; fig.Z - wall, cross section; Fig. 4 shows the wall junction assembly.

The box contains the bottom 1, front 2, rear 3 and two side walls 4.

The bottom 1 and the front wall 2 are made of wood-fiber and wood chipboards, respectively.

The rear 3 and side walls 4 are made of thin-walled wood materials in the form of an insert 5 (base), for example of a fiberboard, and strengthened around the perimeter with a polymer material 6 by means of injection molding. At the same time, the fastening elements of the walls between themselves and the groove 7 for the bottom 1 are simultaneously formed, and the polymeric material forms a permanent connection with the wood material.

The structural elements of the framing on the outer and inner sides of the wall are different in construction and in cross-sectional area. The cross-sectional area of the plastic frame on the outer surface of the wall is larger than on the inside (Fig. 3), and since the compressive forces are proportional to the cross-sectional area, the compressive force on the outer side of the wall is greater than on the inside. Due to this difference, the wall is bent, with the bulge directed towards the groove for the bottom. The magnitude of this bend (deflection) per

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depends on the dimensions of the wall, the characteristics of the plastic and the insert, the construction of the wall in cross section. Therefore, changing these values, you can change the value of the deflection.

The curved wall of the box has certain spring properties. To straighten it, a certain effort must be made.

This technical solution uses thermoplastic plastic - polypropylene, the relative shrinkage of which is approximately 2%, i.e. the detail is reduced in size by 2 mm for every 100 mm of linear size. However, other plastics, such as low pressure polyethylene, polyamides, and the like can be used.

The side and back walls are an insert (base) of thin-walled wood material, such as a fibreboard or plywood, which is inserted into the mold and poured with plastic under pressure, forming a framing wall with wall fastening elements. The plastic in the process of shrinking tends to decrease in size, and since the wood insert is almost incompressible, the plastic frame does not have the ability to be reduced in size, this does not allow for the insertion. As a result, the framing appears to be stretched out by the amount of shrinkage. In this case, tension in the frame appears, and compression in the inset. These stresses are directly proportional to the cross-sectional area of the plastic framing.

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The box is assembled as follows.

In the grooves 7 of the rear 3, side 4 and front 2 walls insert the bottom 1 and, straightening the walls 3 and 4, insert the spikes 8 into the slots 9. The connection of the side 4 and rear 2 walls is additionally fixed with screws 10.

When the crate is assembled, its walls 3 and 4, straightened out, compress the bottom 1, and the walls become straight, characteristic of all types of crates, and the resulting elasticity, trying to give the walls an original curved shape, gives the box additional rigidity and increases reliability in operation.

Thus, the edges of the bottom 1, which are located in the slots 7 of the walls 3 and 4, are constantly tightened due to the elastic forces trying to give the walls their original curved shape, which provides increased rigidity to the box and immobility of the bottom.

Claims (1)

Invention Formula A method of manufacturing a crate, mainly for furniture, comprising making the front, back and side walls with a longitudinal groove and bottom and assembling the crate by installing the bottom in the longitudinal grooves of the walls with subsequent fastening of the walls with connecting elements, characterized by that. what. In order to increase rigidity and operational reliability, the rear and side walls are curved in the longitudinal plane, with the assembly placed with a bulge facing the inside of the box, and when installing the bottom they are straightened to ensure the bottom is spring-loaded with the side and rear walls. 2 FIG. 2 & Editor I.Gorn Compiled by M.R. Bova Tehred E. Tsaplyuk Fy Proofreader E. Dormidontova