PNEUMATIC PERCUSSION DEVICE WITH THROTTLING AIR DISTRIBUTION Russian patent published in 2007 - IPC E21C37/00 B25D9/14 

FIELD: percussion mining and construction machines, particularly methods or devices for dislodging with or without loading.

SUBSTANCE: device comprises supply-line air chamber, switching device, which initiates compressed air delivery to supply-line air chamber, hollow cylinder, striker, which divides cylinder interior into idle and working stroke chambers and accumulation chamber permanently communicated with working stroke chamber thorough bypass channel. Device also has lid installed at cylinder end from working stroke chamber side and permanently opened inlet throttle channel communicated with idle stroke chamber and starting throttle channel permanently opened in idle stroke chamber and connecting supply-line air chamber with idle stroke chamber. Device comprises discharge channel made in cylinder wall and working tool with stem, as well as cup with rim and blind augmenter located in cylinder wall from idle stroke chamber side. The blind augmenter is permanently communicated with supply-line air chamber via throttle channel made in lid. The blind augmenter is periodically connected with idle stroke chamber through radial augment channel made in cylinder wall. Distance between distributing augment channel edge section and discharge channel is less than striker travel. Cup has bottom facing the lid and is provided with annular rim supported by rim made in the lid to create supply-line air chamber.

EFFECT: increased impact force to be applied to substance to be worked.

1 dwg