Boring or penetrating the earth – Automatic control
Patent
1996-11-27
1999-03-09
Dang, Hoang C.
Boring or penetrating the earth
Automatic control
175 40, E21B 4400, E21B 4700
Patent
active
058788247
ABSTRACT:
An arrangement and associated method for thermally protecting an electronic component assembly from heat at least to a limited extent is disclosed herein. The electronic component assembly includes a plurality of thermally sensitive electronic devices, each of which is constructed such that when the device is in a powered state there is a maximum operating temperature to which it may be subjected without causing thermal damage and such that when the device is in a non-powered state there is a higher maximum non-operating temperature to which the device may be subjected without causing thermal damage. During powered operation of the assembly, the temperature is sensed at a predetermined position in close proximity to the devices. When the sensed temperature reaches the maximum operating temperature, operational power is disconnected from the electronic component assembly such that the temperature of the electronic component assembly may rise in an unpowered state to a maximum overall non-operating temperature without thermally damaging the devices. While the invention has specific application to a boring tool, it is adaptable for use in other high temperature environments.
REFERENCES:
patent: 4203087 (1980-05-01), Kovac et al.
patent: 4606415 (1986-08-01), Gray, Jr. et al.
patent: 4646277 (1987-02-01), Bridges et al.
patent: 4990987 (1991-02-01), Boucher et al.
patent: 5337002 (1994-08-01), Mercer
Mercer John E.
Ng Shiu Sang
Zeller Rudolf
Dang Hoang C.
Digital Control Incorporated
Pritzkau Mike
Shear Steve
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