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

FIELD: construction industry.

SUBSTANCE: invention relates to the field of construction and can be used as a pneumatic impact mechanism for compaction of soil foundations, destruction of quarry oversized materials, frozen soil, concrete foundations, pavements and similar structural materials, and can also be used in other areas of similar problem solving. The pneumatic impact mechanism contains a working tool with a shank, a cylindrical body, a cup with a through central hole and an air supply channel from the network, an annular flange with a central hole and a throttle inlet channel, mounted separately relative to the cylindrical body, an end pre-chamber formed between the cup and the annular flange, a striker with a through axial channel placed in a cylindrical body and dividing the cavity of the cylindrical body into working and idling chambers, a rod-tube, passed via a through central hole in the cup, fixed relative to it and installed in the central hole of the annular flange with an outlet to the through axial channel in the striker from the side of the idling chamber, a radial outlet channel in the rod-tube with its continuation in the form of a longitudinal channel with an outlet to the atmosphere, made with the possibility of opening the end of the striker from the shank side of the working tool, moreover, the rod-tube is additionally equipped from the side of the end pre-chamber with a radial throttle air intake channel with its extension in the form of a longitudinal channel with an exit to the idle chamber. In this case, the outer side surface of the rod-tube is made with a stepped channel-groove with a cross-sectional shape in the form of a square or rectangle, and the channel-groove stage on the side of the idling chamber is made with a larger cross-sectional area, and the channel-groove stage on the side of the working stroke chamber is made with a smaller cross-sectional area compared to the cross-sectional area of the channel-groove on the side of the idling chamber.

EFFECT: decrease in the air back-pressure in the chambers at the end of the working and idle stroke of the striker, which guarantees the realization of the calculated value of the working stroke and an increase in the energy of a single impact transmitted to the shank of the working tool.

1 cl, 1 dwg