YIELDING CONNECTION LOCK OF METAL FRAME YIELDING SUPPORT OUT OF MINING SPECIAL STRUCTURAL STOCK. Russian patent published in 2009 - IPC E21D11/22 

FIELD: mining..

SUBSTANCE: invention refers to mineral resource industry and coal mining, particularly to locking devices for sliding at maximum loads connections of arc elements of yielding metal frame supports fabricated out of mining special structural stock and implemented for support of mining (underground) workings of ore, coal and slate mines. The lock consists of strap 1 with apertures 2 and "П"-shaped fastening bracket 3 with threaded ends 4 let through apertures 2 of strap 1, of interior 5 and exterior 6 special profiles located between ends, of nut 7 and also of stiffeners-stabilisers. The stiffeners-stabilisers are made in form of semi-spheres 8,9 with element-filler 19; the said semi-spheres contact with each other around the circumference of a big circle; apertures 10 are made in end planes 11 of poles of semi-spheres 8,9; threaded ends 4 of "П"-shaped bracket 3 are let through apertures 10. The exterior surface of sphere 12,13 formed at conjugation of both semi-spheres 8,9 contacts inclined side wall 14 of the special profile, also simultaneously end plane 17 of the pole of one semi-spheres 9 rests on strap 1 of the lock, while diametrically opposite end plane 15 of the pole of upper semi-sphere 8 is inserted into a thrust with flange 16 of mining special profile.

EFFECT: upgraded reliability of support and safety of mine operations.

3 dwg