PNEUMATIC TAMPER Russian patent published in 2000 - IPC

FIELD: compacting molding sand in manufacturing casting molds and soil during construction jobs. SUBSTANCE: proposed tamper includes casing with handle, striking mechanism, starting device, bush with shock-absorbing cavity where plunger is arranged. Shock-absorbing cavity has two chambers; starting device is arranged in upper chamber. Difference in cross sections of lower shock-absorbing chamber and plunger shall satisfy definite inequality. In starting the tamper, starting device moves upward admitting compressed air from upper chamber to lower one and then to striking mechanism. In raising the tamper from molding sand, striking mechanism is held in definite position by means of shock-absorber. Striking mechanism continues working. EFFECT: increased productivity; reduced labor consumption. 2 dwg