Abstract: Control for a swing mechanism having linear actuators such as hydraulic cylinders connected to the swing mechanism in a manner whereby the actuators work in unison with each other over a portion of the swing of the swing mechanism and in opposition to each other over another portion of the swing when imparting arcuate motion to the swing mechanism with the linear motion of the actuators. The control includes a pressure reducing-metering valve and a metering valve in each of two sets of lines which supply and return pressurized fluid to the actuators. The improvement comprises location of check valves and pilot lines to enhance anti-cavitation conditions by reducing the number of flow paths.

Abstract: A pump is provided with a regulating device which includes a valve and a motor. The motor operates on the pump to vary the capacity thereof. Movement of the motor is controlled by the valve which has a spool and a body. A feedback link is provided between the motor and the body so that movement of the motor due to a displacement of the spool moves the body to return the valve to neutral. Hunting of the transmission is thus reduced.

Abstract: A power steering system has a valve between the pump and steering unit. The valve maintains a constant pressure differential so that the pump is unable to deliver aerated fluid to the unit in the event of loss of fluid or fracture of a pipe.

Abstract: A vehicle having an operators enclosure and an hydraulic circuit is provided with a heat exchanger to warm the enclosure. The heat exchanger is supplied with fluid from the return side of the hydraulic circuit thus eliminating the conventional engine coolant pipes.

Abstract: Braking system, primarily for wheeled excavators, having a first hydropneumatic brake acting on all wheels and a second auxiliary brake acting on the transmission, a first actuating device to operate the first brake when driving on the road and a second actuating device to operate first and second brakes when the excavator is stationary and working on site, the second actuating device being arranged so that on its operation both brakes are applied simultaneously.

Abstract: Control for a swing mechanism having linear actuators such as hydraulic cylinders connected to the swing mechanism in a manner whereby the actuators work in unison with each other over a portion of the swing of the swing mechanism and in opposition to each other over another portion of the swing when imparting arcuate motion to the swing mechanism with the linear motion of the actuators. The control includes a pressure reducing-metering valve and a metering valve in each of two sets of lines which supply and return pressurized fluid to the actuators. The respective valves limit the pressure of fluid to one actuator while requiring a predetermined minimum actuation pressure to provide a more constant speed and torque characteristic for the swing mechanism.

Abstract: A valve control mechanism for operating a plurality of valves in a bank of valves which can be selectively operated by interchangeable lever arrangements one of which has a separate lever for each valve and another of which has a single lever for a pair of valves. The bank of valves and the lever arrangements are detachably removable independently of each other to permit easy servicing and selecting of the desired lever arrangement or to change the sequence of valve operation.

Abstract: A signal is transmitted from a oscillatable piston to a valve by a mechanism comprising a first link pivotal about a second axis and a second link pivotal about a third axis which is perpendicular to the second axis. The second link abuts the first link on both sides of the second axis to transmit motion from the first link to the valve.

Abstract: A transmission having a variable capacity pump and motor is provided with an override device which ensures that the motor is at a maximum capacity, and hence maximum torque capability, prior to operation of other protection devices.

Abstract: A bracket is provided to be mounted on the forward end of the loader arms and to connect the loader arms to the bucket or the like in a readily detachable manner. The bracket is provided with securing means which operate sequentially to first lock the bracket to the loader arms and secondly lock the bucket to the bracket. The geometric relationship between the bucket and the loader arms is thus unaffected.

Abstract: An exhaust system for off the road vehicles of the type incorporating a roll-over protection structure for protecting the operator's station on the vehicle in which the exhaust system is incorporated within a housing forming a part of the protection structure.

Abstract: A single lever control for actuating a pair of adjacent mechanisms such as valves spools in which a pair of actuating arms are supported for pivotal movement about intersecting axes and in which a control lever is supported for universal movement about the intersection of the axes for transmitting movement to both or to a selected one of the actuating arms.

Abstract: A hydrostatic transmission is provided with a variable capacity pump and a variable capacity motor. A control is operable to operate sequentially the pump and motor. A second control is provided to operate on the pump to override the signal to the pump from the first control without altering the setting of the motor. The first control thus acts as a ratio selector and the second control as a clutch.

Abstract: A seal for reciprocating members such as a shaft having a seal ring of deformable material on which an annular taper is maintained to provide pumping action for return of fluid to replenish fluid lost past the seal.

Abstract: A hydraulic machine is provided with a control for reducing the capacity of the machine when subjected to excessive pressure.A piston is slidable in a cylinder to define two chambers, the chambers being interconnected by a restrictive passage. One chamber is connected to the pressure line and the other chamber is connected to a relief valve so that in the steady state the pressure in each is equal. When the pressure reaches a predetermined level the relief valve opens and vents the other chamber. The passage prevents flow to the other chamber creating a pressure differential which causes the piston to move along the cylinder and operate the machine control to decrease the capacity thereof.

Abstract: A valve which may operate as either a check valve or a relief valve includes a chamber which is connected to a first hydraulic conduit by a restricted passage. A relief valve vents the chamber at a predetermined pressure to unbalance the valve member and allow fluid to flow from the first conduit to a second. The valve member is made with a telescoping portion to allow reverse flow when the first conduit is at a lower pressure than the second.

Abstract: Stabilizing apparatus for vehicles supporting load handling equipment such as tractors mounted with backhoes in which the stabilizing apparatus is movable vertically from a transport position to a ground engaging position and also may be moved horizontally to vary the angular disposition of the stabilizers relative to the vehicle to engage the ground at longitudinally spaced positions.

Abstract: Stabilizer apparatus for use with a vehicle such as a tractor supporting load handling equipment such as a backhoe in which foot members disposed at opposite sides of a vehicle are engageable with the ground to stabilize the vehicle and are movable to an elevated position for transport by the vehicle. In the ground engaging position the foot members are positioned with their outer extremities projecting beyond some maximum predetermined width of the vehicle and in their transport position occupy a position in which the outer extremities are disposed within the confines of the maximum predetermined width of the vehicle.

Abstract: Braking systems for tractor and trailer combinations.A valve is mounted on the brake pedal of a vehicle and a second pedal pivotally connected to the brake pedal. The second pedal is connected to the spool of the valve by a spring. Depression of the second pedal allows fluid through the valve to the trailer brakes. Pressure in the trailer brakes acts between the spool and the body to bias the spool to compress the spring. This force is reacted by the brake pedal and thus the brake pedal is actuated by a force proportional to the force in the trailer brakes.

Abstract: In combination with a pump having a variable rate of flow, a device for varying such rate of flow is governed by the pressure generated by the pumps through a variable transmission mechanism the ratio of which depends on the said rate of flow, whereby the power output of the pump can be maintained at a predeterminate value. The device can be used with two pumps for limiting the total power output of both pumps, as being governed by the average of the two pressures.