Monotube differential pneumopercussive reversible self-propelled soil penetrating machine with stabilizers

A monotube differential pneumopercussive self-propelled reversible soil penetrating machine with stabilizers, comprising:

• a monotube elongated housing assembly, including a tube having internal threads in its front part for accommodating a chisel assembly, structurally shaped longitudinal directional stabilizers rigidly attached to the outside surface of said tube and creating between the inner surfaces of said stabilizers and outside surface of said tube longitudinal channels hermetically closed by appropriate plugs at both ends of each stabilizer and used for delivery and exhaust of compressed air;
• a chisel assembly rigidly secured to the front part of said tube for accepting impact loading, including a chisel, a front anvil rigidly secured to said chisel, and a resilient sealing O-ring mounted in an appropriate groove of said chisel in order to prevent leakage of compressed air through the threaded connection of said chisel and said tube;
• a rear anvil assembly rigidly secured inside of the rear part of said tube for accepting impact loading, including a rear anvil, a spring loaded follower slidably disposed in a longitudinal hole of said rear anvil, and means for securing said rear anvil inside of said tube;
• a striker assembly slidably disposed inside of said tube between said rear anvil and said front anvil creating a forward stroke chamber between the rear end of said striker assembly and said rear anvil and a backward stroke chamber between the front end of said striker assembly and said front anvil, including a striker, a front bit rigidly secured to said striker, two bushings slidably mounted on both ends of said striker and having a slide fit with said tube,.and retaining rings mounted in appropriate grooves in said striker for keeping in place said bushings;
• and
• a differential air-distributing mechanism installed inside of the rear part of said tube immediately behind said rear anvil providing pneumatically control of the reciprocating motion of said striker which during forward mode operation of said machine is accelerated without restriction in order to impart an impact to said front anvil and is restricted to impart a slight impact to said rear anvil and during reverse mode operation of said machine is braked to avoid an impact to said front anvil or restricted to impart a slight impact to said front anvil and is accelerated without restriction in order to impart an impact to said rear anvil, including an adjustable by a pressure regulator nominal (high) air pressure line, an adjustable by a pressure regulator reduced (low) air pressure line, a rear valve chest carrying two barbs for hoses for said air lines, a spring loaded relief valve slidably disposed inside said rear chest for connecting by an additional air passage said forward stroke chamber with the atmosphere at the backward stroke of said striker during reverse mode operation of said machine, a coil spring disposed inside said rear valve chest to push said relief valve to its extreme right position, a front valve chest assembled with said tube by a press fit, a hollow stepped bushing accommodated by said rear and front valve chests and centering said rear and front valve chests, a stepped stroke control valve slidably disposed inside said front valve chest, a coil spring disposed in longitudinal central holes of said stepped stroke control valve and said follower and simultaneously loading said stepped stroke control valve and said follower in opposite directions, and a set of bolts securing said rear valve chest to said front valve chest.