Ground boring apparatus

Details Ground boring apparatus Ground boring apparatus

1997-01-15

1998-08-18

Tsay, Frank

Boring or penetrating the earth

Boring without earth removal

Fluid passage to exterior of drive point

175 25, E21B 1038, E21B 2108

Patent

active

057947198

ABSTRACT:
A housing for electrical/electronic apparatus associated with the boring apparatus has a coolant flowpath for directing coolant fluid to cool the electrical/electronic apparatus and/or the housing. A relief coolant outlet port is closed by closure comprising fusible material which fuses at a predetermined temperature thereby to open the relief outlet port. The temperature at which the material of the closure fuses is lower than the temperature at which substantial thermal damage would occur to the electrical/electronic apparatus within the housing (typically at a temperature substantially at or below 200.degree. C).

REFERENCES:
patent: 3659536 (1972-05-01), White
patent: 4547833 (1985-10-01), Sharp
patent: 5148880 (1992-09-01), Lee et al.
patent: 5176219 (1993-01-01), Cole et al.
patent: 5322134 (1994-06-01), Dahn
patent: 5695014 (1997-12-01), Jenne

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