| 摘要 |
FIELD: building equipment, namely percussion action pneumatic apparatuses designed for trench free placing and changing underground pipelines. ^ SUBSTANCE: pneumatic apparatus includes: stepped branch pipe closed at side of striker and provided with lateral openings; idle stroke chamber restricted by inner surface of striker and outer surface of stepped branch pipe and steadily communicated with compressed air source; working stroke chamber restricted by back end of striker, inner surface of housing and outer surface of stepped branch pipe, cyclically communicated with compressed air source and with exhaust chamber. Exhaust chamber is restricted by inner surface of housing, outer and inner surfaces of striker and it is steadily communicated with atmosphere. ^ EFFECT: enhanced operational reliability, increased energy of single percussion and useful life period of apparatus. ^ 2 dwg |
