Abstract: An apparatus for indicating critical torque load in a drill string of a propeller shaft driven rotary drilling machine comprising an input and an output section in axial alignment and drivingly connected so as to rotate conjointly; the input section has an input shaft and a spiral spline affixed thereto; the output section has a tube shaft assembly and an output shaft affixed thereto; an input bearing is provided for rotatably supporting the input shaft and allowing for longitudinal movement of the input shaft toward the output section under conditions of increased torque load; an input housing for receiving the input bearing is affixed to a base; a receiver nut having a complementary female spiral spline is a companion for the spiral spline and is operatively connected to the spiral spline to permit longitudinal movement of the input shaft toward the output section under conditions of increased torque load; a compression spring prevents longitudinal movement of the input shaft under conditions of constant to

Abstract: A tension indicator used on a guy line system of an inclined oilwell derrick, comprising a hydraulic compression load cell, a pair of interlocking U-shaped yokes housing the load cell between the bases of the U-shaped portions, a plunger connected to the load cell bearing against the base of one interlocking yoke, the load cell bearing against the base of the other interlocking yoke, a walking load binder mounted on the outer end of a first interlocking yoke and providing an initial tension load to the guy line system, a threaded nut and screw adjustment assembly affixed to the outer end of a second interlocking yoke and providing a finer adjustment of the tension provided by the walking load binder, a pair of attachment hooks rotatably mounted on the outer ends of the tension indicator device for inserting the tension indicator device between a set of intermediate chains connected in a guy line, and a calibrated pressure gauge directly attached to the load cell; whereby the interlocking yokes transfer a line

Abstract: An inclinometer test assembly comprising a horizontal base plate, a vertical column mounted on the base plate, a support arm pivotally mounted intermediate its ends on the column, the arm having a longitudinally extending recess for receiving the cylindrical body of an inclinometer therein for the purpose of testing the inclinometer, a finger-like clip securing the inclinometer body within the recess, a three-point adjustment for the leveling of the base plate, a pointer plate and a degree plate mounted on the arm and column, respectively, for the positioning of the arm at a predetermined angle relative to the true vertical in order to test the inclinometer.

Abstract: A hydraulic pressure integrator for averaging a plurality of independent input pressures comprising a base plate, a pivot plate mounted above the base plate for pivotal movement about a horizontal pivot axis disposed above and parallel to the base plate, a plurality of input cylinders mounted between the base plate and the pivot plate, each input cylinder having a slidable input piston mounted therein and adapted to contact the pivot plate along a given side of the pivot axis, and a single output cylinder mounted between the base plate and the pivot plate and having an output piston slidably mounted therein and adapted to contact the base plate on a side of the pivot axis opposite from the input pistons, each input cylinder receiving one of the independent input pressures.

Abstract: A drilling rig load indicator for use on a mobile drilling rig of the type which is provided with means for applying a downward force to a drill string and bit and for applying a lifting force to raise the drill string and bit, and being further provided with a hydraulic pressure source which operates a plurality of hydraulic jacks to support and level the drilling rig. The drilling rig load indicator is composed of a hydraulic totalizer, a pressure indicator, and, a plurality of hydraulic pressure gauges. The hydraulic totalizer has an input side which is connected by means of conduits to the hydraulic jacks and an output side which represents the summation of the loads upon the hydraulic jacks. In the event that the conduits cannot be connected to the hydraulic jacks, the conduits may be connected to separate hydraulic load cells which are placed between the hydraulic jacks and the earth.

Abstract: An inclinometer for determining the inclination of a well bore including a longitudinally extending housing adapted to be lowered into the well bore to a given depth, a marking element mounted in the upper part of the housing and being suspended from a point along the central axis of the housing, the marking element having a marking tip at the lower end located on a true vertical line from the suspension point, a rotatable chart member having a chart thereon mounted in the housing below the marking element and normally spaced from the marking tip thereon, the chart member being movable along the longitudinal axis of the housing and upwardly into engagement with the marking tip, whereby the marking tip will make a mark on the chart, mechanism mounted within the housing for moving the chart member at two spaced times into engagement with the marking tip, the chart moving mechanism including means for rotating the chart during the interval between the two times while, simultaneously, insuring that the chart memb