Abstract: Multiple drive paths are provided between the valve plunger and force motor of a direct drive valve and force motor assembly whereby should one of the drive paths fail, the force motor can still be used to drive the valve plunger through another drive path. One of the drive paths consists of a drive shaft having one end drivingly connected to an eccentric on the motor output shaft and the other end connected to the end of the valve plunger remote from the motor output shaft. The drive shaft is desirably provided with an enlarged head portion having a flat annular surface on the axial inner end thereof in close proximity to a corresponding flat end face on the end of the valve plunger closest to the motor output shaft, whereby should the valve plunger break, the drive shaft will hold the valve plunger together and allow for degraded valve performance.

Abstract: A railroad frog has either a cast or rail-built point, resting on a baseplate which is fastened to ties. A pair of heel rails are attached to the point, to the ties and to traffic rails. A pair of movable wing rails extend from the toe of the frog to a location adjacent the point of the frog. At the frog point an open wing rail forms a flangeway with the point, while the other, closed wing rail cooperates with the point to form a continuous tread surface through the frog. The wing rails are alternately thrown between the open and closed positions by an actuator. A series of stops define the open wing rail position and act to hold down the open wing rail. The wing rails have hinges which allow them to move. The wing rails have a full rail base at the hinges. Adaptor plates allow use of the frog on concrete ties.

Abstract: A phase detector for monitoring the presence, sequence and polarity of each phase line for a three-phase power input and indicating when a phase is missing or out of sequence.

Abstract: A control for controlling the operation of a direct current motor by select application of a three phase alternating current line input of given frequency to the armature thereof through solid-state forward and reverse designated switches which are gated by select enable inputs.

Abstract: A railroad spring frog assembly for trackwork installations includes a rigid rail and a flexible spring wing rail. The flexible spring wing rail is rigidly affixed between one end which engages a wing point rail and the other end which connects to a closure rail at the toe end of the frog support means. When a rail car enters the frog and a wheel flange engages the spring wing rail to pass between it and the long point rail the spring wing rail bends away from the long point rail to define a flangeway therebetweeen.

Abstract: Austenitic (Hadfield) manganese steel containing about 25% manganese, 1.4% carbon and 0.1 to 1% silicon, balance essentially iron.

Abstract: A positive displacement pump is provided with an impeller drive shaft seal assembly to prevent material in the pumping chamber from reaching an adjacent drive shaft chamber. The seal assembly comprises a rotary seal member mounted on the impeller having an outer surface spaced a non-uniform distance from the inner surface of a member defining the drive shaft chamber so that when the drive shaft is rotated the changing distance between the inner and outer surfaces causes a pumping action to occur so that material is continually pumped around the seal assembly.

Abstract: Cast iron alloy preferably of about 1.6 carbon, 2 nickel, 2 molybdenum, 28 chromium, and up to 1 of an additional element, balance substantially iron characterized by a matrix substantially entirely of tempered martensite with minimal retained austenite, containing ferrite phases and primary chromium-rich carbides with substantially no secondary carbides.

Abstract: This invention relates to a coupling link comprising a first half line and a second half link, each comprising a unitary member with a pair of spaced ears at one end, a tongue at the other end and a central body member which joins the ears and the tongue. Bores in each of the ears of the first and second half links are aligned with a bore formed in the tongue of the opposite half link when the first and second half links are mated to form a coupling link. A link pin is received in the bores formed in the pairs of ears of the two links and in the bore in the tongue of theopposite link. Each link pin is retained in place by a pair of pin keepers each received in a slot formed in one of the ears to close the pin bore in that ear. Each pin keeper includes a tang which projects from one of the slot openings in the ear and is bent out of alignment with the slot opening to retain the keeper within the slot.

Abstract: A snubber for use with a dipper to retard movement of the dipper door toward and away from an opening formed in the dipper. The snubber includes an elastic member and an actuator link. When the door is at a first angle with respect to the dipper, the elastic member is in tension to retard movement of the door toward the dipper. When the door is at a second angle with respect to the dipper, the elastic member is in bending to retard movement of the door away from the dipper. The snubber is inactive when the door is at an angle between the first and second angles.

Abstract: A multi-port directional valve and subplate for mounting the valve in which the valve body comprises a housing having a plurality of parallel, laterally spaced slots formed in its inner surface; a plurality of individual port modules each having a pair of parallel side walls, a bottom surface, a spool bore, a longitudinal port bore which connects the bottom surface and the spool bore, an outer surface, and a rib formed on the outer surface such that the outer surface of each module is complementary with the inner surface of the housing; a spool which changes the operating position of the valve and a pair of actuator housings each connected to one end of the cover housing and mounted on the subplate; and the valve body is mounted on the subplate to align the module ports with ports in the subplate.

Abstract: A hydraulic axial piston machine is provided which has a swash plate mounted on a yoke which pivots about the axis of a pair of trunnions. The back surface of the yoke is curved and is supported on the surface of a flat, rigid rotary plate which is displaced linearly as the yoke is pivoted. The rotary plate is supported on a pair of roller bearings which are mounted on a resilient damping plate.

Abstract: A disc brake pad comprises a plurality of sintered metallic friction elements, each having a braking surface area of less than 2 in.sup.2 (12.6 cm.sup.2) which are individually mounted on a steel plate or on a flexible carrier plate which is riveted at spaced points about its periphery to the back plate.

Abstract: An adapter tip assembly wherein the nose of the adapter which is received in a tip socket has a circular rear base joined to an ellipsoidal portion which tapers to an elliptical front end such that the external front surface of the tip has a wider horizontal dimension than vertical dimension and the tip is retained on the nose by a retaining pin; the front end ellipse is diminished by upper and lower rearwardly extending flat surfaces and these surfaces merge into upwardly and rearwardly angled surfaces which in turn merge into the ellipsoidal portion.

Abstract: A variable displacement, rocker cam type, axial piston pump in which the rocker cam is driven by a stroking piston and the stroking piston is connected to the rocker cam by a pair of flexible connectors and tension in the first flexible connector is raised and tension in the second flexible connector is lowered when the stroking piston is moved in one direction to pivot the rocker cam toward a position of maximum fluid displacement and tension in the second flexible connector is raised and tension in the first flexible connector is lowered when the stroking piston is moved in the other direction to pivot the rocker cam toward a position of minimum fluid displacement.

Abstract: A pressure compensated pump which supplies fluid to a common header has an automatic pressure compensator adjustment mechanism which adjusts the pressure setting of the pressure compensator in response to changes in the displacement of the pump, such that the compensator pressure setting of the pump is reduced when the displacement of the pump increases to increase pump flow and the pressure setting is increased when the displacement of the pump decreases to reduce pump flow.

Abstract: A variable displacement axial piston pump having a rocker cam and a rocker cradle in which a complement of recirculating rollers is mounted at each side of the rocker cam to support the cam in the cradle and a holddown plate engages the rollers opposite the bearing surfaces between the rocker cam and cradle.

Abstract: An adapter-tip retainer pin has a wedge member and a lock member joined by a first pair of walls on a resilient member. The resilient member includes a central cavity and a second pair of walls which are curved inwardly toward the cavity such that the second pair of walls collapse inwardly when the retainer pin is compressed during insertion or removal from an adapter-tip assembly.

Abstract: A unitary urethane snubber is provided to snub opening and closing movements of a dipper door. The snubber has an elongated working section that is stretched to snub door closing and bent to snub door opening. A pair of integral end lugs pivotally attach the snubber to the dipper and to the door. The snubber is unstressed in an intermediate position to facilitate installation.

Abstract: A high-speed switch machine for actuating railroad switch points. The machine has an electric motor which drives a hydraulic pump. The pump supplies pressure fluid to a hydraulic cylinder adapted to move the switch points from an initial to a second limit position. A four-way, two-position hydraulic control valve directs fluid to the cylinder such that the cylinder automatically operates in an extension and retraction cycle. The uni-directional motor and two-position control valve minimize response times of the actuating components so that the switch points are thrown in a short time period.