Abstract: A two-element seal assembly for sealing relatively rotatable members wherein each seal element has annular radial lip type sealing contact with the other. The seal elements are shaped in a complementary fashion, one with relation to the other, whereby an annular labyrinth is formed therebetween and entrance of damaging materials into sealed area of an installation is effectively excluded by the lip seals and the labyrinth.

Abstract: An engine cooling system for the internal combustion engine of a motor vehicle, such as a construction machine or the like which operates on uneven or sloped terrain, comprises a radiator having a lower core section and an elongated upper section or top tank separated from the core section by a sealed baffle and extending transversely to the longitudinal axis of the vehicle. The cooling system further comprises fluid conducting passages connected between the radiator and the engine, including a radiator supply line and a radiator return line connected between the core section and the engine. The cooling system also comprises a pair of fluid outlet ports located near the bottom of the top tank and spaced apart from each other in a direction transverse to the longitudinal axis of the vehicle.

Abstract: A conveyor drive roller mounting system for controlling misalignment of the drive roller by mounting an end of the conveyor drive roller on a resiliently mounted torque arm which permits the drive roller to align with the conveyor path of movement.

Abstract: A signalling device operatively coupled between the side arm or lifting boom of a pipe layer and the frame thereof in a predetermined fixed position such that movement of the signalling device relative to the fixed position, which occurs in response to the operational load, is directly related to the critical or rolling load for any lateral position of the side arm or lifting boom.

Abstract: A system for monitoring the operability of warning lamps which provide a visual signal in the event of the malfunction or unacceptable variation of a monitored function or control comprising a plurality of optical indicators or warning lamps electrically coupled to a single-control switch common to all warning lamps such that all lamps may be simultaneously illuminated upon the closing of the switch to determine their operability.

Abstract: A pair of self-propelled vehicles joined by an intermediate bridge having a rigid lifting arm hinged at one end to the intermediate bridge and having a device for gripping and lifting the pipes carried by the free end of the rigid arm such that the rigid lifting arm may be controlled to engage a pipe and lift it over the trench and lower the pipe into the desired position.

Abstract: An air pressurizing system including a double acting pneumatic cylinder operatively connected to hydraulic actuated equipment for operation thereby in response to movement thereof to pressurize a hydraulic fluid tank or reservoir and control the air pressure coupled into the hydraulic fluid tank.

Abstract: A shackle system for connection of control lines such as high-pressure hydraulic hoses, electrical cables or conduits, and air hoses having a flexible wire rope passing therethrough to which the control lines are attached.

Abstract: A vehicle suspension system for controlling bouncing and pitching movement of a tractor and trailer unit. The suspension system comprises a four-bar linkage which cushions the vehicle ride by connecting the vehicle axle through the four-bar linkage to permit axle movement which cushions the tractor ride. The four-bar linkage comprises a scraper link, a final drive link, a power module link and a stabilizer link.

Abstract: An excavating machine having a work implement or material excavating tool articulated on the free end of a working arm of the excavator to absorb and dissipate high stress impact loading on the working tool incurred during machine operation.

Abstract: A power divider system with governed speed control wherein a first power path and a second power path are formed by a differential-like power divider. A control system associated with the two power paths senses and controls the speed relationship thereof. The speed of an output element of the second power path is determined and then governed to a predetermined value by modulated transfer of power from the second power path to the first power path. The speed of an output element of the first power path is limited relative to the output element of the second power path by the transfer of power from the first power path to the second power path through a one-way drive system. A power transfer mechanism for governing the second power path to the predetermined speed provides fail-safe operation.

Abstract: An instrument panel cover pivotally connected to the vehicle dashboard and adapted to be folded upon itself into a position above the dashboard to minimize the storage space required by the panel cover when not in use and to eliminate obstructions in the operator compartment or the operator's field of vision.

Abstract: An electric control circuit for use in the ignition system of a vehicle having a vehicle battery powered auxiliary steering system which is energized upon engine failure or shutdown during vehicle operation. The ignition circuit disconnects the auxiliary steering system from the vehicle battery during heating of the pre-start intake air and during starting of the engine to eliminate unnecessary drain on the vehicle battery.

Abstract: A hydraulic system which is monitored to control the application of fluid power in response to the temperature of the hydraulic fluid and a temperature responsive valve for use in the hydraulic fluid circuit to monitor the temperature of the fluid to control the application of fluid power to components of the system.

Abstract: A crawler tractor has an engine-driven transmission for supplying motive power to the left and right crawler tracks through spring-applied fluid-released left and right steering clutches and also has spring-applied fluid-released track brakes. A hydraulic steering clutch and brake control system is provided and includes left and right manually operable steering levers for the clutches and a single foot-operated brake pedal. The control system further includes a single pump for supplying hydraulic fluid to the steering clutches and to the brake actuators for the brakes. A steering valve, having a flow divider therein, receives fluid from the pump and is responsive to actuation of the steering levers to supply fluid to release the steering clutches. The steering valve also continually directs fluid to a pilot operated shuttle valve which is responsive to operation of the steering clutches to direct operating fluid to the brake actuators to effect brake release for that track whose clutch is engaged.

Abstract: A method of and apparatus for the continuous laying of pipe utilizing a plurality of counterbalanced pipe-laying vehicles wherein each pipe-laying vehicle has a movable-arm lifting crane for maneuvering pipe and a movable-arm balancing crane to effect counterbalancing during pipe-laying operation. The lifting arm and the balancing arm are supported on opposite sides of the pipe-laying vehicle such that the lifting arm may be attached to a pipe and the balancing arm may be attached to a counterweight. A second self-propelled vehicle is positioned adjacent to each pipe-laying vehicle such that the movable-arm balancing crane can be attached thereto so that the attached vehicle functions as a counterweight for the pipe-laying vehicle during pipe-laying operation.

Abstract: A selectively actuable push-pull vehicle coupling to be utilized in assisting loading of a vehicle by pushing or pulling the vehicle being loaded. A push plate and tow bar are operatively connected through a common shock absorber which is utilized to cushion vehicle impact during both pushing and pulling operations.

Abstract: A selectively actuable push-pull vehicle coupling to be utilized in assisting loading of a vehicle by pushing or pulling the vehicle being loaded. A push plate and tow bar are operatively connected through a common shock absorber which is utilized to cushion vehicle impact during both pushing and pulling operations.

Abstract: Apparatus for controlling steering clutches and independent brakes of a vehicle comprising a steering device responsive to a pair of clutch actuating steering levers for selectively and independently disengaging the clutches for steering purposes. Operation of a single brake pedal and the disengagement of at least one of the clutches selectively and independently engages the vehicles brakes. An inhibiting mechanism coupled to the steering device selectively inhibits either of the vehicle brakes from responding to actuation of the brake pedal when one of the steering levers is actuated to disengage the corresponding clutch, and prevents the opposite brake from being engaged during brake pedal operation. As a result, the vehicle may be steered while employing a pair of steering levers and a single foot pedal. A control system permits the vehicle to be stopped when both steering levers and the single foot pedal are actuated by inactivating the brake inhibiting mechanism.

Abstract: A master link assembly in a continuous flexible track assembly for a crawler tractor comprises two laterally spaced apart (left and right) parallel master links and each master link comprises two overlapping half-links held in alignment by a pin extending into registering pin holes in the half-links. The overlapping half-links are mechanically secured together in fixed relationship by track shoe capscrews which extend through holes in a master link track shoe which overlies both half-links and screw into tapped capscrew holes in the half-links. Besides aligning the overlapping half-links, each pin also serves as a safety connection in case the capscrews break and also enables removal of the capscrews and replacement of the track shoe without breaking the track assembly.