PNEUMATIC HAMMER Russian patent published in 2016 - IPC E21C37/24 B25D9/04 

FIELD: construction.

SUBSTANCE: invention relates to construction equipment and can be used as a pneumatic hammer for destruction of mine rock lumps, frozen soil, concrete foundations, roads and similar materials and structures. Pneumatic hammer comprises an air-hammer mechanism of throttle valve type. Comprises working tool with shank, cylindrical housing, bucket with air feed channel from the network, detachably secured relative to the housing, annular flange with central bore and throttle inlet channel, end precombustion chamber formed between the bucket and annular flange, striker installed in casing with through axial hole and bypass channel on the side surface and dividing the housing cavity into chambers of working and idle strokes, a tube rod installed in the central hole of annular flange pushed through the central hole in the bucket and fixed relative to it, recess in idle stroke chamber, interacting with bypass channel in the form of a flat channel or a slot channel on the side surface of the striker, radial discharge channel in the tube rod with its extension in the form of axial longitudinal channel with outlet to atmosphere, and openable and closable end of the striker. Bypass channel on the side surface is blind without reaching the ends of the striker. A circular additional precombustion chamber is formed between the bucket and the housing. Annular flange is equipped with side wall and bypass channel, continuously communicating end prechamber with additional precombustion chamber. In working stroke chamber on the flange side there are a circular braking chamber and a circular accumulation chamber in the form of annular grooves separated by an annular collar. And in the housing wall at the level of circular grooves are made through bypass channels constantly connecting additional prechamber with braking chamber and accumulation chamber. In idle stroke chamber there are front circular bypass chamber and back bypass chamber in the form of grooves, separated by annular collar. Chambers are made so that at interaction of grooves with braking chamber of bypass channel is connected with accumulation chamber and in the position of the striker, resting on working tool shank front bypass chamber communicated with accumulation chamber and braking chamber.

EFFECT: higher kinetic energy of single stroke and reduced relative blowing rate.

1 cl, 1 dwg