PNEUMATIC PERCUSSIVE MECHANISM Russian patent published in 2022 - IPC B25D9/00 

FIELD: building.

SUBSTANCE: invention relates to the field of building and can be applied as a pneumatic percussive mechanism for compacting foundation soil, destructing quarry oversize, frozen soil, concrete foundations, road surfaces and similar structural materials, and can also be used in other areas of solving similar problems. Pneumatic percussive mechanism comprises a working tool with a shank; a cylindrical body; a socket with a through central hole and a channel for the air supply from the system; an annular flange with a central hole and a throttle inlet channel, secured separately relative to the cylindrical body; an end pre-chamber formed between the socket and the annular flange; a striker with a through axial channel, placed in the cylindrical body and dividing the cavity of the body into the working and idle stroke chambers; a tube rod passed through the through central hole of the socket, secured relative thereto and installed in the central hole of the annular flange with the output into the through axial channel of the striker on the side of the idle stroke chamber; a radial outlet channel in the tube rod, continuing as a longitudinal channel with the output into the atmosphere, configured to be opened by the end of the striker on the side of the shank of the working tool; wherein the tube rod is additionally equipped with a radial throttle air intake channel on the side of the end pre-chamber, said channel continuing as a longitudinal channel with the output into the idle stroke chamber. The outer side surface of the tube rod therein is made with a stepped channel flat; wherein the stage of the channel flat on the side of the idle stroke chamber is made as a larger-area segment in the cross section, and the stage of the channel flat on the side of the working stroke chamber is made as a smaller-area segment in the cross section, compared to the area of the segment of the channel flat stage on the side of the idle stroke chamber.

EFFECT: reduced back-pressure of air in the chambers at the end of the working and idle stroke of the striker, guaranteeing the implementation of the calculated magnitude of the working stroke and the increase in the single impact energy transmitted to the shank of the working tool.

1 cl, 1 dwg