PNEUMATIC STRIKER MECHANISM Russian patent published in 2017 - IPC E21C37/22 B25D9/14 

FIELD: machine engineering.

SUBSTANCE: mechanism includes a cylindrical body with outlet channels and a bushing installed therein, a stepped hammer with a rod and a main portion, a through hole and a bushing in the rod portion with a channel-groove dividing body cavity into idle stroke chamber from a shank side and a circular working one, a circular flange with channels for air supply from a network chamber rigidly fixed relative to the circular flange of the rod which is constantly located in the hammer through-hole and interacting with the channel-groove of the bushing, the working tool with the shank portion, a circular distributing chamber communicating on one side with the network chamber by channels for air supply of the circular flange and on the other side with the circular working chamber by means of a circular throttle channel, at that the rod is installed for periodic communication depending on the position of the stepped hammer, the circular distributing chamber and the idle chamber therebetween. The circular throttle channel is formed by channel-grooves or channel-flats with variable cross section along the height made on diametrically opposite sides of the rod portion of the striker.

EFFECT: reduction of the air back pressure in the idle chamber and circular distributing chamber of working stroke by adjusting the amount of air supplied in the chamber, thereby economy of the device is increased.

2 cl, 4 dwg