Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
336 words
Apparatus for tempering the weld area between a tool joint ocnnector and one end of a drill pipe tube, said apparatus comprising: an electric induction heating coil into which said weld area may be placed to be heated, means to support said drill pipe tube in an inital position with the axis of the tube aligned with the axis of the coil and with the weld area outside of the coil, motor means for changing the relative axial position of said tube and coil to a heating position in which the coil is about said weld area and for restoring said initial relative axial position of said tube and coil, a first infrared radiation responsive detector means for generating a first electric signal in response to infrared radiation of a specified temperature, said first detector means including an infrared optical system focused to view said weld area of said drill pipe tube when in said initial position, means responsive to said first signal for actuating said motor means to cause said tube and coil to be placed in said heating position, said coil having a path for infrared viewing of said weld area from outside of the coil while said coil is about the weld area, second infrared radiation responsive detector means for generating a second electric signal in response to infrared radiation of a certain temperature, said second detector means including a second infrared optical system focused through said path on a surface radially inward of the inner periphery of said coil where said weld area may be positioned, and means responsive to said second signal for actuating said motor means to cause said tube and coil to be placed in said initial relative axial position, both of said detection means optical systems being mounted to be stationary relative to said coil, said motor means moving said coil axially to and from said weld area without motion of the tube and connector, whereby said detector means optical systems are alternately focused upon said weld area.
Claim 2
Dependent Claim
336 words
Apparatus for tempering the weld area between a tool joint ocnnector and one end of a drill pipe tube, said apparatus comprising: an electric induction heating coil into which said weld area may be placed to be heated, means to support said drill pipe tube in an inital position with the axis of the tube aligned with the axis of the coil and with the weld area outside of the coil, motor means for changing the relative axial position of said tube and coil to a heating position in which the coil is about said weld area and for restoring said initial relative axial position of said tube and coil, a first infrared radiation responsive detector means for generating a first electric signal in response to infrared radiation of a specified temperature, said first detector means including an infrared optical system focused to view said weld area of said drill pipe tube when in said initial position, means responsive to said first signal for actuating said motor means to cause said tube and coil to be placed in said heating position, said coil having a path for infrared viewing of said weld area from outside of the coil while said coil is about the weld area, second infrared radiation responsive detector means for generating a second electric signal in response to infrared radiation of a certain temperature, said second detector means including a second infrared optical system focused through said path on a surface radially inward of the inner periphery of said coil where said weld area may be positioned, and means responsive to said second signal for actuating said motor means to cause said tube and coil to be placed in said initial relative axial position, both of said detection means optical systems being mounted to be stationary relative to said coil, said motor means moving said coil axially to and from said weld area without motion of the tube and connector, whereby said detector means optical systems are alternately focused upon said weld area.
Claim 3
Dependent Claim
50 words
Apparatus according to claim 1, including an electric circuit connectable to a source of electric power for energizing said coil, manual means for closing said circuit after said coil has been moved to heating position, and means responsive to said signal from said second detection means for interrupting said circuit.