CZ290332B6 - Structure of walls of cast-iron products - Google Patents

Abstract

The present invention relates to structure of walls of cast-iron products, particularly building and machine iron castings, which are provided with surface features, such as skid projections (7) or slots (8). Such cast-iron product body has a honeycomb structure, which is formed by a layer of regular cavities (4), particularly in the form of hexagons. One side of the cavity (4) is open and at the same time, the cavities (4) are coupled with each other by a solid bottom plate (5) and terminated by a peripheral wall (6). Height dimension of the lateral walls (3) of the cavities (4) can be variable in dependence on position of the cavity (4) in the solid bottom plate (5), whereby said solid bottom plate (5) has geometric shape.

Description

The invention relates to the wall structure of cast iron products, most often machine and construction castings.

BACKGROUND OF THE INVENTION

So far, only the full structure of the walls of cast iron products is known; Smooth solid walls of castings, possibly with additional ribs on the walls to improve mechanical properties, most often to increase the possibility of loading.

The disadvantage of these castings is the high weight, high material consumption and poor adhesion to the surrounding terrain.

SUMMARY OF THE INVENTION

The above-mentioned disadvantages eliminate the solution of the wall structure of cast iron products, most often construction and machine cast iron castings, according to the invention.

The essence of the invention is that the body of the cast iron product has a honeycomb structure which is formed by a layer of regular cavities, in particular in the form of hexagons. One side of the tube is open. The tubes are connected by a bottom solid plate and terminated by an edge wall.

In a variant embodiment of the wall structure of cast iron products according to the invention, the height dimension of the lateral sides of the tubes is variable depending on the position of the tube in the bottom solid plate and the bottom solid plate has a geometric shape.

The advantage of the proposed solution is to reduce the weight of the product and save material by about 30%, while maintaining the mechanical properties. This advantage is achieved by the way of transmitting forces in the structure of the product as it is loaded.

A second advantage is to improve the bonding of the structured article to the surrounding terrain in a natural manner, i.e. by blending the surrounding material, i.e. concrete or natural resin, into the structure of the article. This creates an amorphous connection of the product to the surrounding terrain.

BRIEF DESCRIPTION OF THE DRAWINGS

The solution according to the invention is more clearly apparent from the drawings.

Fig. 1 shows a half-hatch and a frame in cross-section. In the second part of the same figure is an outer plan view of the frame.

Fig. 2 is a bottom view of the frame and hatch, indicating the structure.

FIG. 3 shows a section of the frame, partly in section, and partially showing the surface of the frame with non-slip projections.

-1 CZ 290332 B6

DETAILED DESCRIPTION OF THE INVENTION

The solution according to the invention was used in the cover 2 by the gash 1 for the circular sewer manhole. The cover 2 and the frame 1 were cast from cast iron. Both castings have conventional external features, namely anti-slip protrusions 7 on the walking surface and four notches 8 are formed in the frame 1 for receiving the mud basket.

The body of both building castings has a honeycomb structure. It consists of a layer of regular hexagonal tubes 4. One, ie. the outer side of the tube 4 is open. As can be seen from FIG. 1, in the hatch 2, the height dimension of the lateral sides 3 of the tubes 4 varies depending on the position of the tube 4 in the bottom solid plate 5. This aligns the mechanical properties when loading the casting.

The tubes 4 are connected by a bottom solid plate 5, which in the case of a frame 1 is shaped into a circle. At the same time, a shoulder 9 for receiving the cover 2 is formed therein. This structure of the walls of cast iron castings is terminated by an edge wall 6, as shown in Fig. 1.

Maintaining the correctness of the technological procedure in the installation of the cover 2 with frame 1, ie maturation of concrete for 28 days or use of natural resin, will prevent the drainage cover from falling under the leveling of the road zero.

Industrial applicability

The solution was developed for sewer manhole covers with the aim of their continuous connection with the surrounding terrain of concrete, asphalt type. Furthermore, the wall structure according to the invention is also applicable to other cast iron castings for the industrial machine industry.

PATENT CLAIMS

Claims (3)

1. The structure of the walls of cast iron products, most often construction and machine cast iron castings, which are provided with external treatments such as non-slip protrusions (7) or notches (8), characterized in that the cast iron body has a honeycomb structure consisting of a layer of the tubes (4), in particular in the form of hexagons, where one side of the tube (4) is open and at the same time the tubes (4) are connected by a bottom solid plate (5) and terminated by an edge wall (6). Wall structure of cast iron products according to claim 1, characterized in that the height dimension of the lateral sides (3) of the tubes (4) varies depending on the position of the tube (4) in the bottom solid plate (5). The structure of the walls of cast iron products according to claims 1 and 2, characterized in that the bottom solid plate (5) has a geometric shape.