Protecting device against idle blows for pneumatic percussion tools, especially for coal picks

摘要

380,621. Percussive drills. HAUSHERR, F. and HAUSHERR & SÍHNE GES., R., Sprockhovel, Westphalia, Germany. Oct. 8, 1931, No. 27986. [Class 124.] To absorb the idle blows of the piston, air cushions are formed both in the space h under the piston and in the space i under the steel collar within the tool retainer. Cushions k, k1 of resilient material are also provided.