Abstract: A loader vehicle boom arm assembly incorporates a pair of box section boom arms in which the top plate of each box section boom arm has a cross sectional shape such that the upper surface is provided with an arcuate surface that directs foreign objects encountering the arcuate top surface off the boom arm.

Abstract: An expansion joint for use with a retrievable packer includes a stop to limit the extent to which the joint may be extended and for providing vertical support for packer retrieval and further includes and interfitting key and slot acting between a housing and a mandrel telescoped into the housing in order to transmit torque through the joint.

Abstract: A method for drying oil well drill cuttings to eliminate pollution causing organic material from the cuttings includes conveying the drill cuttings bearing the organic material to a heat transfer zone. Large quantities of relatively warm fixed gas are supplied to the heat transfer zone, with the gas functioning as a heat transfer medium. The gas is mixed with the drill cuttings to vaporize water and pollution causing organic material therefrom, with the temperature of the drill cuttings subsequently increasing.

Abstract: A tractor type motor vehicle is provided with a two compartment front end assembly, one compartment being an engine enclosure and the second compartment being a heat exchanger compartment. Each compartment is evacuated by a separate fan that directs air to a common discharge opening between the two compartments. Improved cooling and noise control are realized by the utilization of the invention.

Abstract: A means for pivotally mounting the bellcrank of a bucket linkage between the boom arms of a loader, including pivot castings secured to each of the boom arms, a shaft extending through said pivot castings and the bellcrank, a plate secured to one end of the shaft and bolted to the adjacent pivot casting to prevent rotation of the shaft relative to the boom arms, and a second plate bolted to the other end of said shaft to limit inward axial movement of the shaft relative to the adjacent pivot casting.

Abstract: A variable speed engine (10) drives a tractive effort drive train (12) and fixed and variable displacement pumps, (14 and 16) arranged to supply fluid pressure to a hydraulic work system (24). The displacement of the variable pump (16) is determined by a control ram (42) and a conduit (44, 53, 74) interconnects the variable pump output and the control ram (42). An engine speed control valve (60) and a system pressure compensator valve (46) interposed in series in said conduit (44, 53, 74). The two valves (60 and 46) maintain the variable pump (16) at full output except when low engine speed and high system pressure exists simultaneously.

Abstract: An articulated tractor loader vehicle which has side rear view convex mirrors mounted to the back of headlight housings for providing a panoramic rear view of the lateral sides of the tractor loader vehicle rearwardly of the front rubber tired wheels and rearwardly of the rear rubber tired wheels.

Abstract: A multi-purpose lifting vehicle includes a hydraulic cylinder for controlling the elevation of a boom hoist device operably connected thereto. The device is alternately used in crane or front end loader modes of operation. The vehicle includes a hydraulic system for controlling the operation of the cylinder comprising a multi-position mode selector valve for selecting the specific mode of operation of the boom hoist device for raising, lowering and enabling the boom hoist device to float. The control system further includes a holding valve for locking the hydraulic fluid within the raising end of the cylinder for maintaining the elevation of the boom hoist device. A first bypass circuit is provided about the holding valve for enabling fluid to escape from the raising end of the cylinder while fluid is simultaneously flowing to the lowering end thereof.

Abstract: A rigid draft and buffing sliding sill includes cushion elements operably attached thereto for absorbing shocks generated during buff or draft operating conditions. The draft and buffing sliding sill extends lengthwise of the underframe of a railway car. At least one of the cushion elements remains inactive until the shock forces acting on the underframe exceed a predetermined magnitude.

Abstract: A hanger and stinger assembly includes an expandable joint therebetween for the stinger to be telescoped with the hanger between extended and collapsed positions. An actuating spool for use in conjunction with a wireline tool mechanism is provided for hydraulically actuating the slips on the hanger and a releasable catch is connected between the stinger and a tubular receptacle mounted on the hanger to normally limit upward movement of the stinger to its extended position. A latch at the upper end of the stinger is utilized to hold the catch in a release position enabling the stinger to be withdrawn from the receptacle by a straight pull and a locking mechanism normally positions the latch to keep from holding the catch in its release position and the locking mechanism is hydraulically actuated.

Abstract: A bowl and slips assembly for supporting tubing in a well includes a plurality of gripping inserts supported on slip bodies by means of a cantilever connection with the inserts hang-supported from the top surfaces of the bodies so the bodies are in compression when supporting tubing in the well. In comparing adjacent slip bodies, one includes a shoulder formed in the top surface thereof so adjacent inserts are supported in vertically spaced positions. A safety ledge integrally formed with each body prevents broken inserts from falling into the well.

Abstract: A downhole oil well hydraulic pump has a reciprocating piston assembly with a piston ring mounted in a groove around the piston. This piston ring groove has a main portion which loosely mounts a piston ring and an auxiliary portion joining the main portion which accumulates well fluid to lubricate the piston ring during operation of the pump.

Abstract: A well tool assembly comprising a drillable cement retainer and setting tool includes a connection between a setting-tool mandrel and a retainer mandrel allowing for opening and closing of a cement valve in the retainer without disconnecting the setting tool from the retainer. A releasable locking mechanism in the connection keeps a tubular connector between the setting-tool mandrel and the retainer mandrel locked against sliding relative to one of the mandrels prior to deploying an upper slip set of the cement retainer. Additionally, a carrier in the setting tool includes radially resilient lugs connected between the setting-tool mandrel and a retaining sleeve for the upper slip set for sliding upwardly on the setting-tool mandrel to carry the sleeve into an upper position releasing the upper slip set for deployment. A set lock in the retainer holds the retainer mandrel against movement downwardly once the retainer is anchored in the well.

Abstract: A slip deployment mechanism for use in conjunction with a packer in a tubing string includes a cylindrical retainer telescoped over the upper ends of a plurality of slip segments and interfitting means on the segments and a mandrel coact with the retainer to keep the slips locked in place. A longitudinally acting spring reacting against a lateral reaction surface on the mandrel urges against the slip segments to advance them into an initially set position between an expander head of the packer and the interior wall of the casing when the retainer is moved from a locked position into a release position to free the slip segments. A stop acting between the mandrel and the retainer prevents the lower end of the retainer from binding against the slip segments in service use.

Abstract: A well swab cup has an annular bushing for supporting a plurality of longitudinally extending wire reinforcing members within an elastomeric cup-like body. The reinforcing members are supported by a base cup around the lower portion of the bushing and extending upward within the body. An internal elongated hollow reinforcing member extends upward from the base cup within the pattern of the wire reinforcing members and within the elastomeric, cup-like body.

Abstract: A railway car coupler includes a knuckle locked in a closed position and movable into an open position upon opening of the lock and actuation of a thrower arm engaging the knuckle. The thrower arm is configured to limit the shortening of the knuckle opening moment during the knuckle opening movement.

Abstract: A hanger and stinger assembly includes an expandable joint therebetween for the stinger to be telescoped with the hanger between extended and collapsed positions. An actuating spool for use in conjunction with a wireline tool mechanism is provided for hydraulically actuating the slips on the hanger and a releasable catch is connected between the stinger and a tubular receptacle mounted on the hanger to normally limit upward movement of the stinger to its extended position. A latch at the upper end of the stinger is utilized to hold the catch in a release position enabling the stinger to be withdrawn from the receptacle by a straight pull and a locking mechanism normally positions the latch to keep from holding the catch in its release position and the locking mechanism is hydraulically actuated.

Abstract: A crankshaft and its method of manufacture involves a straight, one piece shaft, with eccentric journals and circular gear base pressed onto the shaft and secured thereto in proper angular orientation.

Abstract: A reversing control valve for a fluid operated downhole oil well pump having reciprocating pistons that is constructed to control the velocity and reversing of the pistons. The control valve functions to control the piston velocity and prevent damage to the pump components due to shock stresses induced by pressure impulses typically associated with pumped well fluids. The reversing control valve is constructed to regulate the piston velocity in response to the sensing of several pressure conditions in the well and in the pump.

Abstract: A construction for the cone section zone of oxygen converter vessels consisting of a plurality of courses of refractory brick having a parallelogram configuration to provide a smooth surface for the working lining face.