| 摘要 |
FIELD: mining, particularly hand tools or hand-held power-operated tools specially adapted for dislodging minerals. ^ SUBSTANCE: pneumatic hammer has body with radial outlet channel and central channel, lid with annular shoulder and central orifice supported by body end in air-tight manner, striker with through axial channel dividing central body channel into working and idle stroke chambers, tube having blind shoulder arranged from lid side, longitudinal and radial channels. The tube is installed coaxially in central body channel and cooperates with through axial channel of the striker and with central lid orifice by side wall thereof so that annular dap is created between tube and lid. The annular gap may be closed with blind lid shoulder. Hammer has cup, which is air-tightly installed relative annular shoulder and body so that annular accumulation chamber is formed between side cup surface and lid. Annular accumulation chamber is permanently communicated with idle stroke chamber by radial bypass channel in the body. Annular lid shoulder and cup with air inlet channel define prechamber. Air inlet channel permanently communicate prechamber with compressed air system through air hose and nipple releasable connected to the cup. Hammer comprises ring with outlet orifices forming outlet chamber between the body and outlet channel, executive tool with shank and shoulder cooperating with body end and with shank cooperating with hammer, cap with annular shock absorber retaining executive tool from falling out of central body channel. Executive tool shank is provided with central blind hole for receiving tube rested upon bottom thereof. Side surfaces of the tube and central blind hole cooperate to define annular channel having throat, which is not less than that of longitudinal tube channel. ^ EFFECT: increased operational reliability and power of hammer stroke. ^ 2 dwg |
