SU1250315A1 - Pole for women gymnastic parallel bars - Google Patents

Description

The invention relates to sports equipment, in particular to women's gymnastics bars.

The purpose of the invention is to reduce sports injuries due to the operational reliability of the victims.

FIG. 1 shows a pole, a longitudinal section; in fig. 2 is a section A-A in FIG. one.

The pole consists of a body of oval cross section, made in the form of a power plastic tube 1, which is coated with organic material 2, for example wood veneer. Each horse body is made with longitudinal cuts in the form of a collet with an inner annular protrusion 3, which is located in the annular groove of the tip 4 and fixed therein by a retaining ring 5. At the end of each tip 4 located inside the tube 1, an axial recess 6 is made, for example, ogival, forming a sharp end edge 7,

The plastic tube 1 is made of glass and carbon, pre-impregnated with a binder and laid both in the longitudinal and in the ring directions (tangentially). In this case, most of the threads are oriented longitudinally, with 80 to 90% of all threads passing to their share.

Outside, the tube 1 is lined with an organoleptic material 2 that meets these requirements, such as planed or peeled beech, hay or birch veneer (GOST 2977-77, GOST 99-75).

The retaining rings 5 are made with a conical outer surface with a taper of 1: 5 to 1: 8 to the center of the pole and are made of a unidirectional fiber material impregnated with a binder and wound with successive tangential layers, for example, glass, carbon or organoplasty.

The manufacturing technology of the pole is as follows.

On the metal modular mandrel, the fully repeating configuration of the inner cavity of the pole body is laid in both longitudinal and

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five

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And tangential directions in a highly defined ratio of glass and carbon, pre-impregnated with a polymeric binder, for example, marks EDT-10 and oriented mostly longitudinally, ranging from 80 to 90%. The more: the carbon content, the higher the modulus of elasticity of the shell material and the thinner the wall of the tube can be made with the same carrying capacity.

After laying on the mandrel glass and coal it is placed in the mold. Preliminarily, a facing organoleptic material, for example, beech veneer according to GOST 2977-77, is placed on the forming surface of the mold. Next, the mold is closed and the polymer binder, for example, EDT-10, is blended through its internal cavity.

The assembly is then placed in a heated chamber and the semi-finished product is cured. After the polymer binder has cured, the mold is dismantled.

By machining, i.e. slits of the longitudinal grooves at the ends of the tube, receive the collet, which has an inner annular ledge. Our collet removes the metal modular mandrel from the interior of the tube.

After the mandrel has been removed, tips are placed at each end of the tube and fixed by winding onto the collet portions of the tube with successive tangential layers of a unidirectional fibrous material impregnated with a polymeric binder, for example glass fibers. The winding is carried out so that the retaining rings with a taper of 1: 5 - 1: 8 to the center of the pole form are obtained, this allows to ensure their variable rigidity in the axial direction and, accordingly, reduce the stress concentration in the transition zone, the shell - the tip .

After curing the material of the retaining rings and coating the working surfaces with varnish, the pole is finally ready for operation.

Compiled by G.Tsarapov Editor M.Petrova Tehred V.Kadar Proofreader S.Shekmar

Order 4358/8 Circulation 406 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

2

Claims (4)

1. The pole of the female gymnastic beams, comprising an oval cross-sectional body, lugs installed with the body one in the other, and means for fixing them between each other, _in order to reduce the sports injuries by increasing its strength, the body is made in the form of a power plastic tube with inner annular protrusions and longitudinal cuts at the ends, each tip is made with an axial recess forming a sharp end edge, and an annular groove on the outer surface, respectively which is shaped like a protrusion of the tube, and each fixing means is made in the form of a retaining ring, with each tip installed in the cavity of the tube with a protrusion in the annular groove of the tip, and the retaining rings cover the outer surface of the split ends of the tube. 2. The pole according to claim 1, characterized in that the plastic tube is made of glass and carbon, pre-impregnated with a binder and oriented mostly longitudinally in the range from 80 to 90%. FROM 3. The pole of the pop. 1, distinguished by the fact that the plastic tube is lined with organoleptic material from the outside. 4. The pole of the pop. 1, characterized in that the retaining ring is made with a conical outer surface with a taper in the range of 1: 5 - 1: 8 to the center of the pole and is formed of a unidirectional fibrous material impregnated with a binder and wound with successive tangential layers. SU .. ,, 1250315 ^{7 6} quel