Abstract:
The invention relates to reversible air-punching mechanisms for making holes in soil by compaction. According to the invention, the mechanism comprises a hollow housing in which a striker reciprocated by compressed air, strikes the housing and thus moves it through the ground. The compressed air is delivered into the working chambers through an air-feed bushing which is provided with two rows of ports getting alternately in line with the corresponding rows of ports in the hollow slide valve accommodated in the bushing as said slide valve turns around its longitudinal axis. For turning the slide valve, it is connected with the bushing by a projection which moves along an enclosed shaped recess during the reciprocating motion of the slide valve when the mechanism is reversed by cutting off momentarily the supply of compressed air to the mechanism.
Abstract:
A self-propelled air-punching mechanism for making holes in soil by its compaction, in which a hollow body is provided with a pointed head section with a striker being located within the body and forming therewith front and rear pressure chambers, and the front chamber communicating with an additional space within the pointed head section of the body, thus raising the impact power of the mechanism.