APPARATUS FOR INERTIA-FREE SETTING OF VARIABLE RESISTANCE OR FOR FACILITATING IN SPORTSMAN EXERCISING PROCESS Russian patent published in 2004 - IPC

FIELD: equipment for controlling sportsman's motive actions.

SUBSTANCE: apparatus has variable resistance unit and motion parameter registering and informing unit. Variable resistance unit has base, bridging built into base, and two U-shaped poles rigidly connected with their upper parts to one another by means of two cross-members and secured to base. Each of two poles has bar holder discretely repositioned and fixed on pole by means of brackets. Two chains are secured with their one ends to bar top surface and with their other ends to bar bottom surface and thrown over two pairs of sprockets positioned for rotation on two spindles and shaft. First pair of sprockets is fixed on shaft mounted by means of bushings with bearings on upper cross-members of U-shaped poles and second pair of sprockets is fixed on two spindles mounted by means of bushings with bearings on base. One chain is running around fifth sprocket similar to four mentioned sprockets and positioned for displacement in vertical plane on U-shaped pole, in its mid portion, and for fixation thereon, and around sprocket, whose pin is fixed on support mounted on base. Lever put on fifth sprocket may be fixed by means of spring-loaded finger on sprocket, whose pin is secured on support, at different angles with the help of respective openings. Motion parameter registering and informing unit has motive action parameter measuring device including strain-measuring sensors of strain-measuring platform built into bridging, and linear motion and angular variations sensors switched through analog-to-digital converter to personal computer. Pin, on which sprocket is movably positioned on support and onto which lever is put is secured in cantilevered relation on support. Power means is made in the form of shock-absorber having one end connected in sliding-rotating relationship with free end of said lever and other end secured on base. Such construction allows influence of load weight upon motive actions to be eliminated.

EFFECT: simplified construction and increased efficiency.

4 cl, 4 dwg