SELF-LOCKING BOLT-NUT SET Russian patent published in 2013 - IPC F16B43/00 F16B39/24 

FIELD: machine building.

SUBSTANCE: self-locking bolt-nut set includes a bolt; a nut tightened on the bolt; and a washer installed between the bolt and the nut. Bolt includes a head and a shank. The shank has male thread with a guide groove for introduction, which is formed in the bolt shank along longitudinal direction of the bolt shank. In the nut there provided is a counterbore formed in the nut, and on circumferential inner surface of the counterbore of the nut, there formed is a variety of thrust projections located in the direction in a circumferential direction at constant intervals. Some part of the washer is located on the counterbore section of the nut, and the washer includes a projection preventing rotation and projecting from inner peripheral edge of the washer to its centre, and which is inserted into a guide groove, as well as a variety of elastic projections projecting from inner circle of the washer, of twisting shape, which are inclined in the direction, in which the nut rotates for its tightening. When tightening the nut, elastic projections are bent elastically by being passed above the first surfaces of the corresponding thrust projections, and then, they are returned to initial states under action of elastic force. Elastic projections are locked with the second surfaces of thrust projections.

EFFECT: elimination of attenuation of a connection as a result of vibration.

4 cl, 16 dwg