AIR HAMMER Russian patent published in 2017 - IPC E21C37/24 B25D9/04 

FIELD: construction.

SUBSTANCE: air hammer includes an air hammer mechanism of a throttle-valveless type, comprising a working tool with a shank, a cylindrical housing, a cup with a channel for supplying air from the circuit, fixed detachably relative to the housing, an annular flange with a central opening, an end pre-chamber formed between the cup and the annular flange, a striker with a through axial hole, disposed in the housing and separating the housing cavity into a working stroke chamber and an idling chamber, a rod-tube mounted in the central opening of the annular flange, passed through the central opening in the cup and fixed relative to the cup itself, a groove in the idling chamber, a radial release channel in the rod-tube with the channel continuation in the form of a longitudinal axial channel opening into the atmosphere and opened by the striker end from the shank side of the working tool. An annular accumulation chamber is formed between the cup and the cylindrical housing. The annular flange is equipped with a sidewall and a radial bypass channel formed therein, continuously communicating the end pre-chamber with the annular accumulation chamber. In the working stroke chamber of the annular flange side, an annular chamber of a pneumatic buffer and an annular power augmentation chamber are made in the form of annular recesses separated by an annular bead. In the housing wall, at the level of the recess of the annular power augmentation chamber, through-pass radial power augmentation channels are made, constantly communicating the annular accumulation chamber with the annular power augmentation chamber. The lateral rod-tube surface is equipped with a bypass channel in the form of a channel-flat with a cutting edge on the side of the annular flange, so that the bypass channel inlet on the side of the working stroke chamber is made at the level of the annular bead separating the annular chamber of the pneumatic buffer and the annular power augmentation chamber.

EFFECT: increasing the momentum of the pressure forces for the striker acceleration, both during the idling and the working stroke, increasing the kinetic energy of the striker with its subsequent transmission to the working tool shank.

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