SU1253652A1 - Balance beam - Google Patents

Description

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The invention relates to gymnastic equipment designed to improve the complex technical activities of gymnasts, in conditions of a reduced footprint, in particular to a gymnastic log with elastic elements.

The purpose of the invention is to improve the dynamic characteristics of a log by reducing the reduced mass of the structure and uniformly distributing the elastic properties over the working surface of the log, regardless of the point of application of force during nitoco-parallel movement of the log along the vertical.

FIG. 1 shows a gymnastic log, side view; in fig. 2 - scheme of the compensatory link.

Gymnastics log includes a crossbar 1, located in the plane of the crossbar of the rack: 2 and with ptki 3, Crossbar I is equipped with brackets 4 and 5, the first of which is equipped with compensatory link 6, Racks 2 are L-shaped, one of which has a brace 7 The inner legs of each pillar carry fixed vertical supports 8, Crossbar 1 connected to the uprights by means of rigid pillars 10 and II connected by a firm grip 9 and cylindrical springs 12 with rigid control means 13 at the base. OEK 2. Rotary bearings 10 and 51 comprise a pivot orthogonal three-tier system of levers 14-19, levers 14 and I7 are made angular,

The corner lever 14 with its apex is connected with the top of the rack 2., and the lever 17 with a strut 7.

At the same time, their horizontal shoulders are facing each other. The lever 14 is connected by a horizontal arm to the crossbar 1 through the hub Shlteyn 5 j and the link 16 is located vertically and is hinged at its middle with the inner leg of the rack 2. The link 19 is hingedly connected with the top of the other rack 2, is located

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above the horizontal lever arm 17; and connected with a compensatory link 6, the other end of which is connected pivotally to the crossbar through bracket 4 5. The end of link 16 and the vertical arm 17 are connected with pull 9. The springs 12 are located vertically between the lower support 8 and the horizontal lever arm 17 respectively, the rotary support 10 and the compensatory link 6 rotary support 11,

Gymnastics log contains fixed on the base of the buffer 20 with a hole 21, the damper 22 is made of an elastic material - porous rubber with a high internal friction coefficient (with maxi: greasy hysteresis loop) and placed in the buffer 20, while the ha ha 9 is installed in the hole 21 buffer 20 with a potential for contacting with the damper 22.

The damper 22 is installed in a buffer with the ability to interact with the control flywheel .23. T he 9 is located in the guide tube 24 and. in Pt 3 "Wrong l1; and the pipe is equipped with flange connectors: -sh 25.

The orthogonal lever system of the elastic suspension works in the following manner.

Under the influence of gymnastics on the surface of the crossbar 1, the cylindrical SPRING 12 synchronously compressed (regardless of the point of force application) at the expense of the work of the levers 14 and 17J connected hingedly to the thrust 9 through a swing. 16 link.

The gymnastic suspension system - a log provides only about one degree of freedom (plane-parallel movement vertically). the identity of all static5 dynamic, energy characteristics regardless of the position of the gymnastics. The basis of the design efficiency is the work of: an orthogonal lever system of suspension for an elastic log within small angular displacements (Fig. 2).

The damper 22 absorbs most of the energy (at least 90%). elastic deformation, stored spring 12, during the return of the bars 1 to its original position.

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Compiled by G, Tsarapov Editor Io Segl nick Tehred M. Khodanich Proofreader V. But ha

Order 4665/11 Circulation 406 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow,, Raushsk nab ,, d. 4/5

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

Claims (2)

1. GYMNASTIC LOGS, containing a crossbeam connected with racks located in the plane of the crossbar by means of rotary supports connected by an adjustable thrust and coil springs with stiffening means, and a damper, characterized in that, in order to improve dynamic characteristics, it is equipped with a compensating link, the racks have Λ-shaped, one of which is equipped with a spacer, and the inner legs of each ”rack are fixed vertical supports, the rod is rigid and located at the base of one The swivel arms, the pivot bearings, contain articulated orthogonal three-link lever systems in which * one of the levers is made angular, the angular levers with their vertices are connected respectively to the top of one of the racks and to the middle of the strut of the other, and their horizontal shoulders are facing one another, with this angular lever connected with the top of the rack, horizontal shoulder connected to the crossbar, and the third link of this lever system is vertically and pivotally connected its middle part with the inner leg of the rack, the third link about the other lever system, it is pivotally connected to the top of the corresponding strut, located above the horizontal arm of the angular lever and connected to the compensating link, the other end of which is pivotally connected to the crossbar, while the end of the third link of one lever system and the vertical arm of the angular lever of the other system are connected with the rod, and the springs are located vertically between the stationary supports of the uprights and the horizontal arm of the angular lever of one lever system and the compensating Even of the other, 2. A log in π. 1, the fact is that it is equipped with a buffer with a hole fixed to the base under one of the racks, the damper is made of elastic material and placed in the buffer, while the rod is installed in the buffer hole with the possibility of contacting with the damper. f