IMPACT DEVICE Russian patent published in 2012 - IPC E21B1/38 

FIELD: construction.

SUBSTANCE: impact device comprises a body with holes, a striker with longitudinal channels on the external surface installed in the body as capable of displacement, chambers of forward and reverse stroke, a channel in a striker to communicate chambers of forward and reverse stroke, a stop inner surface of the body with a front circular ledge and a reverse stroke limiter on its rear part, an elastic ring, installed in the circular groove on the striker as capable of interaction with the stop inner surface of the body. The stop inner surface of the body is equipped with a conical surface arranged between the front circular ledge and its rear part and coupled with them, besides, between the surface of the rear wall of the circular groove and the end surface of the elastic ring there is a sharp angle formed, the top of which is directed towards the striker axis. The sharp angle is formed by arrangement of the rear wall surface of the circular groove as conical. The sharp angle is formed by arrangement of the end surface of the elastic ring at the side of the rear wall of the circular groove as conical. The front wall of the circular groove has smaller diametre than its rear surface. The walls of the circular groove are formed by two collars on the external surface of the striker. The external surface of the elastic ring is arranged as conical and faces backwards with its smaller diametre. The rear part of the stop inner surface of the body is arranged as cylindrical or conical. The body is arranged with an anvil, besides, the stop inner surface is arranged in the anvil, and the front circular ledge, the specified conical surface and the reverse stroke limiter - on this surface. The elastic ring is installed in the circular groove with tight fit.

EFFECT: improved operation reliability.

10 cl, 9 dwg