G - Physics – 01 – P
Patent
G - Physics
01
P
340/148.5
G01P 13/00 (2006.01) B23P 19/06 (2006.01) B25B 23/14 (2006.01) E21B 19/16 (2006.01) H02P 5/50 (2006.01)
Patent
CA 1213653
TITLE: APPARATUS FOR COUNTING TURNS WHEN MAKING THREADED JOINTS INCLUDING AN INCREASED RESOLUTION TURNS COUNTER ABSTRACT OF THE INVENTION An apparatus for controlling the number of turns made and the torque applied during the operation of making a threaded joint includes a high resolution turns counter. The turns counter senses the rotation of a member of the joint and gen- erates a pulsed signal, each pulse representing a predetermined increment of rotation. The turns counter includes an idler wheel driven by one member of the joint and in turn driving an encoder which generates a relatively large number of pulses per revolu- tion of the idler wheel. A presettable divide-by-N circuit is utilized to divide the encoder pulses to generate a pulse train to a monitoring and control apparatus for indicating whether a good or a bad joint has been made. The divide-by-N counter can be preset to generate a predetermined number of pulses per revolu- tion of the joint member or pulses representing a predetermined percentage of a total number of turns to be made. Also disclosed is an apparatus as provided for controlling the-speed of rota- tion of a joint member during the operation of making a threaded joint. At lower speeds of rotation, a counter means receives clock pulses generated at a predetermined frequency and counts down from a stored value representing the elapsed time for a maximum rate at which turn signal pulses generated during prede- termined increments of rotation of the joint member should be generated. If the elapsed time between the turn signal pulses is less than or equal to the stored time, a signal is generated to slow down the joint making operation. At higher speeds of rota- tion, a counter means receives the turn signal pulses and counts down from a stored value representing the maximum number of turn signal pulses which should be generated in a predetermined time interval. If the turn signal pulse total exceeds the maximum number during the predetermined time interval, the slow down signal is generated.
399640
Hall James D.
Stone Lyndon R.
Baker International Corporation
Borden Ladner Gervais Llp
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