ZEMLYAKOV'S LOCKING BOLT FOR FASTENING IN BLIND HOLE Russian patent published in 2009 - IPC F16B39/04 F16B39/10 F16B41/00 

FIELD: machine building.

SUBSTANCE: locking bolt for fastening in blind hole is made from main bolt with standard hexahedral head, treaded rod with main thread on external cylindrical surface, through axial hole with additional thread. Additional thread is made from butt side of main bolt threaded rod on length not longer that diametre of threaded rod of additional bolt, on which locking threaded element is installed, made in form of said additional bolt with hexahedral head, whose threaded rod is longer than threaded rod of main bolt. Between head of additional bolt and flat surface of main bolt head on threaded rod of additional bolt spring washer is installed and tightened. Sides of additional bolt head are enveloped by sides of hexahedral hole of polyhedral washer, one side of which is tightened to butt flat surface of hexahedral head of main bolt. Diametral size between interfacial angles of polyhedral washer and diametral size between interfacial angles of hexahedral head of main bolt are equal. Operational thickness of polyhedral washer is greater that spring washer thickness. Above sides of main bolt head and sides of polyhedral washer thermocontractable tube or cap is installed and rigidly tightened.

EFFECT: increasing reliability of locking.

2 cl, 5 dwg