PNEUMATIC HAMMER WITH THROTTLE AIR DISTRIBUTION STRUCTURE Russian patent published in 2005 - IPC

FIELD: mining, particularly hand tools or hand-held power-operated tools specially adapted for dislodging minerals.

SUBSTANCE: pneumatic hammer comprises arm with cup, executive tool, body with outlet channel closed with lid from arm side and defining annular prechamber for system air between cup and lid, working and idle stroke chambers, displacement chamber located between lid and larger body step and pressurizing chamber defined by recess with cut-off edges permanently formed on inner side surface of central stepped channel by annular prechamber communicated with compressed air system. Hammer also has inlet throttle channel formed in pressurizing chamber wall, annular neck portion located in central stepped lid channel between pressurizing and displacement chambers, bypass displacing channel having radial outlet formed in the body and communicating with working stroke chamber arranged between pressurizing chamber and outlet channel formed in the body and striker with upper and lower cut-off edges located in central stepped channel along body axis. Distance between the striker edges is greater than distance between displacement chamber outlet and cutoff edge of larger central channel step. Hammer is additionally provided with inlet throttle channel made in the lid and permanently communicated with annular prechamber. Radial bypass displacing channel inlet is formed in the annular neck portion between pressurizing and displacing chambers from displacing chamber side so that distance between cut-off edges of displacing chamber on side central stepped body channel surface is greater than distance between cut-off striker edges.

EFFECT: increased power of hammer stroke.

1 dwg