Air-operated reversible percussive action machine

Abstract From the Canadian patent

Abstract, An air-operated reversible action percussive machine comprises a housing in which there is disposed for reciprocations a hammer, defining therewith a front working chamber and having a through radial passage. In the axial interior of the hammer on the side of its tail end there is provided a substantially cylindrical tube of stepped configuration which includes first and second steps of large and small diameters, respectively, these steps having radial passages. The first step of the tube defines with the hammer a rear working chamber, and with the second step defines an annular cavity in which a spring-loaded sleeve capable of axial displacements is disposed. The outer diameter …