BG64778B1 - Elastic disc for training tools, matrix and process for the production thereof - Google Patents

Abstract

The disc, the matrix and the process find application in the light industry for the production of sports equipment. The disc is made of moulded rubber mixture of granulated vulcanized rubber, zinc, stearic acid, sulphur, and on elastomer base: fillers, softeners, additives and vulcanization system. The moulding matrix comprises a lower and an upper forming plate, separated by an additional insert and connected by locking screws. The matrix has spacer upper and lower plate (1), medium forming plate (4) and core (5). The medium plate (4) is fitted over the additional insert (B), fitted over a lower forming plate (2), between plates (1). By the method for the production of discs, granulated vulcanized rubber of scrap wastes are mixed with the elements of the composition for the moulding rubber mixture at elevated temperature and in an open or a closed rubber mixer. The mixture produced goes across a roller unit and a cooler until the production of a smooth sheet 5-10 mm thick. The sheets are cut until the production of blanks which are laid in the moulding matrix (A) fitted to a hydraulic press and are vulcanized at a temperature ranging between 150 and 170 degrees C. Cross-linking of the rubber mixture occurs in the process of vulcanization and a product is turned out which can be further treated.

Description

The invention relates to an elastic training disc, a matrix and a method for its production, which will find application as an element of sports training equipment, as well as in the creation of sets of different weights for completing training equipment in gyms, sports and training centers and personal training equipment.

BACKGROUND OF THE INVENTION

There is a known elastic bar of an exercise device located in the center of a spring so that the ends of the bar can be pressed together only by overcoming the force of the spring. In order to obtain the force by which the ends of the bar are pressed, it is variable, an elastic rubber disk component is wound around the center of the bar / DE 19620945 /.

A weight plate is known for use with an exercise device of the type of rod in which the plate is connected to rotate during movement during the exercise, which rotation is blocked by a lever connected to the plate to rotate therewith. so that it touches the outer front of the person's arm during movement of the exercise. The plate includes projections and indentations of its front and rear surfaces to engage with one another on the plates adjacent to each other so that the plates rotate together without the lever having to penetrate all plates / US 4880229 /.

An extremely easy to use weight for human exercise is known, consisting of a mass disc sufficient to cause resistance to human movement and having at least one inner diameter with a central axis for receiving a device for mounting the disc, such as the disc includes first and second sides, usually opposite, radially oriented with respect to the central axis and ending with first and second ends representing circles, with an outer outer surface projecting between said first and second ends respectively. said first and second side and at least one recess in the disc, open towards this outer peripheral surface, wherein the central axis of this recess intersects the center inner diameter, the recess is sufficiently large / US 5853355 /.

Rubber compounds for the manufacture of rubber products containing granular vulcanized rubber of secondary raw materials, zinc, stearic acid and sulfur are known (EP 0672719).

A weight-forming matrix for rods is known, consisting of a lower and upper forming plate, separated by an insert and connected by locking screws, / FR 2459056 /.

A method for the manufacture of rubber products is known wherein the granulated vulcanized rubber of secondary raw materials is mixed with crude rubber, oil, fillers and accelerators included in a moldable rubber compound (EP 0672719).

SUMMARY OF THE INVENTION

It is an object of the invention to provide an elastic disc for training devices of high relative weight, durability, density and unlimited possibilities for a combination of weight, diameter, height, coloring, marking, matrix, and method for its production, using as a starting material uses a normal plastic rubber compound to create a low cost product.

The problem is solved with an elastic training disc containing secondary raw materials, and according to the invention also contains an elastomeric base, fillers, softeners, additives and a vulcanizing system included in the molding rubber mixture in the following proportions, by weight%: 50 to 80, chalk 20 to 30, carbon black 5 to 30, oil 0 to 10, barite 0 to 40, zinc oxide 1 to 6, stearic acid 0.1-0.8, vulcanized granulated rubber of secondary raw materials 3 to 18, antioxidants 0.1 -0.9, accelerator, sulfide type 0.1 -0.9, accelerator, type guanidine 0.3-1 and sulfur 1-3.

In a second embodiment, a plasticizer is used as a filler in the molding rubber mixture.

In a third embodiment, the molding rubber mixture contains colorants.

In a fourth embodiment, an elastic training device disk is constructed of an outer decorative layer and an inner base layer on an elastomeric base, where the decorative layer is a colored elastic film.

The problem is also solved with a molding die for making an elastic disk, consisting of lower and upper forming plates, separated by an additional insert and connected by means of locking screws. According to the invention, the nut is provided with restrictive upper and lower plates and a middle forming plate. A heart is embedded in the lower forming plate and the middle forming plate is disposed on the additional insert B placed on the lower forming plate between the restraining upper and lower plates disposed respectively on the outer surfaces of the lower forming plate and the upper forming plate.

In a second embodiment, the molding die is provided with an upper heart and a second additional insert B, wherein the upper heart is embedded in the upper forming plate and the second additional insert B is disposed between the bounding upper plate and the forming upper plate.

The method of producing an elastic disc for training equipment is that the granulated vulcanized rubber of secondary raw materials is mixed with the raw rubber, oil, fillers and accelerators included in the molded rubber mixture. According to the invention, the rubber is mixed with the other elements of the molding composition of the rubber mixture at high temperature in an open or closed rubber mixer. The rubber molding thus obtained is passed through a shaft unit and cooler to form a smooth sheet of 5-10 mm thickness. The resulting sheets are placed on heating tables, where they are cut to obtain workpieces or tapes of precisely defined weights and dimensions, after which the cut workpieces are laid in a molding die fixed fixedly respectively to the upper and lower plates of the floor hydraulic press. The molding die is provided with additional inserts or an additional insert and an embedded blend of rubber compound. After the workpiece is embedded in the molding die, it is closed by closing the upper and lower plates of the floor hydraulic press, respectively, and vulcanizing at a temperature of 150-170 ° C for 20-75 min, which during the vulcanization process occurs crosslinking of the rubber compound, vulcanization, producing a product for processing. The product thus obtained is removed from the molding die, trimmed in its outer and inner diameter, and then a metal bushing is inserted into its stand by its internal diameter. The resilient disc formed in this way is elastic, forming an elastic film, after which the resilient discs are dried under atmospheric conditions for 1 to 6 hours and marked.

The advantages of the invention lie in the fact that the resilient disk has high performance of reliability, functionality, durability and relative weight, and its production method enables it to achieve high economic efficiency due to the low cost of the materials used and the technological process.

Through the combination of the main constituents of the rubber compound for molding, the molded resilient disc is provided with a high relative weight, the required compressive strength and high strength properties, reducing the thickness of the disc, that is, creating the possibility of producing discs with a high relative weight a surface in the diameter direction which facilitates and facilitates the placement of the disks on the training equipment and results in a uniform relative weight distribution on it, and therefore to a smaller torque relative to the axis of the device, which consequently leads to easier operation and increased safety for the training competitors.

The composition of the rubber compound for forming elastomeric-based elastomeric disks allows the manufacture of blanks of a certain weight and size, which corresponds accordingly to the predetermined weight of the disc, as well as controlled high relative density.

Due to the technological possibility of coloring and the presence of an additional insert, as an addition to the design of the molding matrix of the elastic disk, which determines the technological possibility for the construction of a relief layer, the elastic disk becomes a carrier of additional information.

Depending on the requirements of the respective user, the surface of the disc may be engraved differently in order to indicate the relevant data, as well as be colored in the appropriate color, and also a combination of different color and weight disks, complete in depending on the requirements of the user and the devices at his disposal.

Disc molding is simplified and takes place in an anti-isocyanate environment, in the absence of toxic binders that are hazardous to the health of the manufacturing industry.

The method of production of the elastic disks of the invention provides a high compaction of the molding mixture and allows the disks to be produced in different sizes and thicknesses, depending on the set weight.

The cost of raw materials, materials and energy for the production of elastic discs is significantly lower than the cost of producing such discs of vulcanized granulated rubber of secondary raw materials and binder.

Description of the attached figures

An exemplary embodiment of a molding die for forming elastic disks, a working drawing of the elastic disk and an additional insert explaining the essence of the invention are shown in the accompanying figures, of which:

Figure 1 is a partial view of an elastic disc for training equipment;

Figure 2 is a cross-sectional view of an elastic disc for training equipment;

Figure 3 is a cross-sectional view of a mold for forming an elastic disk by vulcanization with an embedded billet;

Figure 4 is a view of an additional engraving insert intended to be embedded in the molding die.

Examples of carrying out the invention

The composition of the molding rubber compound intended for molding the elastic disc for training equipment can be illustrated by the following examples:

Example 1.

The moldable rubber mixture consists, in kg, of the following ingredients:

Rubber 50

Chalk 130

Soot 40 Butter 10 Barite35 Zinc oxide 5 Stearic acid 0.9

Recycled granulated rubber of secondary raw materials 8

Antioxidants 0.8

BMTS Accelerator 1

DPG Accelerator 0.9

Sulfur 2 Example 2.

The moldable rubber mixture consists, in kg, of the following ingredients:

Rubber 100

Chalk 100

Soot 50

Vaseline 10

Barite35

Zinc oxide 3

Stearic acid 0.9

Vulcanized granulated rubber of secondary raw materials 12

Antioxidants 0.8

BMTS accelerator 1.3

DPG 0.7 Accelerator

Sulfur 2

Elastic disks for training equipment are manufactured, and the composition of the molding mixtures contained in Examples 1 and 2 is obtained after mixing their constituent elements in an open or closed rubber mixer. The rubber molding thus obtained is passed through a shaft unit and cooler to form a smooth sheet of 5-10 mm thickness. The resulting sheets are placed on preheating tables, where they are heated to obtain blanks or strips of precisely defined weights and dimensions, after which the cut blanks are deposited in the mold A (FIG. 3). The molding matrix A (FIG. 3) is provided with additional inserts or an additional insert B (FIG. 3). 4 / and is fixed fixedly respectively to the upper and lower plates of the floor hydraulic press. Once the workpiece is inserted into the molding die, it is closed by closing respectively the upper and lower slabs of the floor hydraulic press and the molding die is subjected to vulcanization at a temperature of 150-170 ° C for 20-75 min. of vulcanization occurs the crosslinking of the rubber mixture, vulcanization, resulting in a product for processing. The product thus obtained is removed from the molding die, trimmed in its outer and inner diameter, and then a metal bushing is inserted into its stand by its internal diameter. The resilient disc formed in this way is elastic, forming an elastic film, after which the resilient discs are dried under atmospheric conditions for 1 to 6 hours and marked.

The molding of the elastic disk C / FIG. 1 and 2 / is performed by inserting an additional insert B. in the matrix A, comprising restrictive upper and lower plates 1, lower forming plates 2, upper forming plates 3, middle forming plates 4, heart 5 and locking screws 6. insert B is mounted on the bounding lower bounding plate 1 and forming lower plate 2 with the heart 5 embedded therein, and then the middle forming plate 4 is fastened on the additional insert B and lower forming plate 4. in the middle zone s forming plate 4, whereby the so loaded shaping mold is closed by closing the upper and lower plate of the press, to which it is attached in order to proceed to cure.

In a second embodiment, the elastic disk is formed by molding two additional inserts into the molding die respectively on a restraining lower plate and forming a lower plate and a limiting upper plate and forming an upper plate respectively provided with an upper and lower heart, respectively.

In this way, engraved elements are obtained on the two radially opposite walls of the elastic disk simultaneously.

Said embodiments do not limit the scope of the present invention.

Application of the invention

Elastic disks for training devices of the present invention are used to supply sports and training centers with sets of disks of minimal thickness, of different weight, diameter, height, color, for equipment of different devices, which makes it possible to realize a multi-color combination of different discs with different indices intended for different appliances, at relatively low cost, due to the ability to control the relative weight of the rubber mixture, the weight of the finished part, and finalizing the processing by additional coloring.

Claims

Claims (7)

1. Elastic training apparatus disc containing granular vulcanized rubber, zinc, stearic acid and sulfur, characterized in that it contains an elastomeric base, fillers, softeners, additives and vulcanizing system included in a moldable rubber mixture in the following quantitative proportions .%: rubber from 50 to 80, chalk from 20 to 30, soot from 5 to 30, oil from 0 to 10, barite from 0 to 40, zinc oxide from 1 to 6, stearic acid 0.1-0.8, vulcanized granulated rubber from. secondary raw materials 3 to 18, antioxidants 0.1-0.9, accelerator, sulfide type 0.1-0.9 , accelerator, guanidine type 0.3-1 and sulfur 1-3. Elastic disk according to claim 1, characterized in that a plasticizer is used as a filler in the molding rubber mixture. Elastic disk according to claim 1, characterized in that the molding rubber mixture contains colorants. Elastic disk according to claim 1, characterized in that it consists of an outer decorative layer and an inner base layer on an elastomeric base, wherein the decorative layer is a colored elastic film. Molding die for making an elastic disk according to claim 1, comprising a lower and upper forming plate, separated by an additional insert and connected by means of fixing screws, characterized in that the matrix is provided with restrictive upper and lower plates (1 ) and a middle forming plate (4), and a heart (5) is embedded in the lower forming plate, wherein the middle forming plate (4) is disposed on the additional insert (B) mounted on the lower forming plate (2) between the restraining upper and a lower plate (1) arranged in c tvetno on the outer surfaces of the lower shaping plate (2) and said upper forming plate (3). Molding die according to claim 5, characterized in that it is provided with an upper heart (5) and a second additional insert (B), with the upper heart (5) embedded in the upper forming plate (3) and the second additional insert (B) is located between the restraining upper plate (1) and the forming upper plate (3). 7. A method for the production of resilient disks according to claim 1, wherein the granulated vulcanized rubber of secondary raw materials is mixed with crude rubber, oil, fillers and accelerators included in a moldable rubber mixture, characterized in that the granular vulcanized rubber of rubber raw materials. is mixed with the other elements of the high-temperature molding rubber composition, in an open or closed rubber mixer, after which the resulting rubber molding mixture is passed through a shaft unit and cooler, e producing a 5-10 mm thick sheet, the sheets thus obtained are placed on heating tables, where they are cut to obtain blanks or strips of precisely defined weights and dimensions, and then the blanks are deposited in a molding die (A), fixed fixed to the upper and lower plates of the floor hydraulic press respectively, and provided with additional inserts (B) or additional insert (B) and embedded billet (7) of a rubber mixture, after which the molding die (A) is closed by are closed accordingly the floor and bottom plate of the floor hydraulic press and vulcanize at a temperature of 150-170 ° C for 20-75 min, during which the rubber mixture crosslinks during the vulcanization process, producing a workpiece, thus removing the product thus obtained from the molding die (A), cut the outer and inner diameter, and then press the inner sleeve of a stand on its inner diameter, an elastic disc forming an elastic film is formed on the elastic disc thus formed, and then the painted elastic disks are dried. AT under atmospheric conditions for 1 to 6 h and labeled.