Reversible penetrating machine with a differential air...

Details Reversible penetrating machine with a differential air... Reversible penetrating machine with a differential air...

2007-09-25

2007-09-25

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Boring without earth removal

C173S091000

Reexamination Certificate

active

11081064

ABSTRACT:
The invention represents a new design of a reversible penetrating machine (90) with a pneumatically controlled differential air distributing mechanism. This design eliminates the springs, the rear anvil assembly, and several other components found in the prior machine. The chisel and the tail of the machine are also redesigned to eliminate the need of a special attachment in case of retracting a failed machine. In addition, a simplified modification of the machine for special applications is disclosed in which the rear valve chest with associated parts is replaced by a single flange having appropriate air ducts. Finally, the new design of the chisel causes a reduction of the lateral friction between the body of the machine and soil. All this significantly increases the reliability and efficiency of the machine and results in decrease of the related manufacturing and operating cost.

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