Boring or penetrating the earth – Boring without earth removal
Patent
1993-04-19
1994-05-17
Bui, Thuy M.
Boring or penetrating the earth
Boring without earth removal
173137, E21B 100
Patent
active
053119509
ABSTRACT:
The invention represents a differential pneumopercussive self-propelled reversible soil penetrating machine (100) having essentially higher efficiency, reliability, durability, and controllability compared to conventional machines. All of these achievements are associated in part with the development of an innovative differential air-distributing mechanism (106) which inherently allows for relatively long strokes of the striker (104) resulting in relatively high impact energy of the striker. The operation of this mechanism is based on the difference between the pressures in the two separate nominal (high) and reduced (low) pressure air lines which deliver compressed air to the machine. In order to switch over the machine (100) from the forward to the reverse mode operation or vice versa it is just necessary to adjust properly the pressure in the reduced (low) pressure air line by a conventional air pressure regulator associated with the source of compressed air. Since the differential air-distributing mechanism does not need a mode control device and a separate exhaust channel for the reverse mode operation, the machine (100) is considerably simplified. The invention also provides a directional sensor (165) informing the operator about the deviation of the machine (100) from the desired trajectory and a rear anvil assembly (105) which is rigidly connected with the housing (101) and eliminates impact loading from the body parts of the differential air-distributing mechanism and the tail nut (152). This makes it possible to manufacture these body parts of soft and plastic materials.
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