Abstract Pneumatic reversible percussion device used for making holes in the ground. The device is characterized in that under the action of compressed air the striker reciprocates in a hollow housing and delivers percussions upon the latter, thereby making the device move in to the ground. The compressed air is supplied into working chambers of the housing along an air-supplying bushing having ports provided on its portion interacting with the striker, overlapped by a slide valve during the forward movement of the device and used to outstrip the supply of compressed air into a front chamber during the reverse movement of the device. The slide valve is rigidly connected with a spring-loaded sleeve that is loosely mounted on the bushing and is actuated by a spring when the device is switched over to a reverse movement by way of dropping the pressure, as compared to the nominal one.
A reVersible percussion device for making holes in the ground by compaction, comprising a housing pointed at one end and defining an inner space; a striker accommodated in said space and forming therewith front and rear variable-volume working chambers which periodically communicate with each other, said striker imparting impacts to said housing as it reciprocates therein under the effect of compressed air supplied to said chambers; an air-supplying stepped bushing having a partition between the steps thereof and interacting by one of its ends with said striker, while the other end of said bushing is secured in a portion of said housing opposite to said pointed end, said one end of the bushing, which interacts with said striker, having ports therein for the supply of the compressed air into said front chamber; a slide valve located inside said bushing for moving along the axis thereof to close said ports in one of its end positions; and a spring-biased sleeve for moving along said bushing and rigidly coupled with said slide valve.
Claim 2
Dependent Claim
171 words
A reVersible percussion device for making holes in the ground by compaction, comprising a housing pointed at one end and defining an inner space; a striker accommodated in said space and forming therewith front and rear variable-volume working chambers which periodically communicate with each other, said striker imparting impacts to said housing as it reciprocates therein under the effect of compressed air supplied to said chambers; an air-supplying stepped bushing having a partition between the steps thereof and interacting by one of its ends with said striker, while the other end of said bushing is secured in a portion of said housing opposite to said pointed end, said one end of the bushing, which interacts with said striker, having ports therein for the supply of the compressed air into said front chamber; a slide valve located inside said bushing for moving along the axis thereof to close said ports in one of its end positions; and a spring-biased sleeve for moving along said bushing and rigidly coupled with said slide valve.
Claim 3
Dependent Claim
32 words
The reversible percussion device as defined in claim 1, wherein said slide valve is coupled with said sleeve by means of pins extending through said partition between said steps of the bushing.