Abstract: The invention comprises a crank-linkage arrangement for a hydraulic servo valve, used on a road planer, to give the valve more sensitivity. It has a valve-operating crank coupled to a leverage-type linkage. The linkage responds to movements of a ground-engaging ski, which tracks the road surface, by displacing a same degree as does the ski, but by effecting a greater displacement of the crank. Limit stops on either sides of a limb of the linkage prevent any damaging overtravel of the crank.

Abstract: In the first-depicted embodiment, the valve is of the ported, plate-type, having a ported valve seat, stop plate, a buffer plate, and a pair of valving elements. Stop pins extending from the stop plate restrict the lift of one of the ported valving elements to a lift dimension in which the flow coefficient provided thereby diminishes at a linear rate. The other ported valving element, carried by the first to the restricted limit of travel thereof, is free to continue its lift, in a valving function then, through a like valving lift dimension in which the flow coefficient which it affords also diminishes at a linear rate. Springs, interposed between the just-mentioned other valving element, and the stop plate, bias the valving elements in closure of the ports in the valve seat.

Abstract: A seal of annular configuration sealingly engaged with an annular surface of an element, to inhibit a communication thereacross of low- and high-pressure environments of the surface, and either one, or a pair of annular support rings engaging the seal. The seal and rings have interfacing and tapered or inclined surfaces and, consequently, the seal is restrained against (a) an unwarranted movement toward the surface being sealed, thereby to prevent its unwarranted extrusion, and (b) heavy radial gas force in that the gas forces act axially and radially on the support rings.

Abstract: In the embodiment shown, the assembly comprises a pair of apertured weights mounted on a rotatable shaft, each of the weights having abutment surfaces one or another pairs of which close upon each other, depending upon the direction of shaft rotation. One of the weights is keyed to the shaft to rotate therewith; the other weight is freely rotatable relative to the shaft. Upon rotation of the shaft in a first direction, a first pair of the abutment surfaces engage, and the eccentricities of the weights then are so disposed as to produce a given-amplitude vibratory force. Upon rotation of the shaft in a contrary direction, a second pair of the abutment surfaces engage, and the eccentricities of the weights then are so disposed as to produce a vibratory force of a differing amplitude.

Abstract: The valving element, according to the first embodiment depicted, comprises a plate-type element having an undulated or scalloped edge or periphery. The plate-type element has a plurality of flow ports formed therein each of which subtends an arc drawn from the radial center of the element. The ends of the ports, which otherwise would be subject to fatigue, failure and fracture, are spaced further from the edge than in prior art practice. Accordingly, the shock of impact of the plate-type element on opening or closing is less likely to precipitate fatigue and failure of the port ends. Additionally, at a plurality of locations about the periphery, the plate-type element has linear portions; upon the plate-type element impacting on any of these linear portions, it will make a line contact which more readily disperses the impact shock.

Abstract: The invention comprises an Accessory for use with a driver for forceably inserting friction rock stabilizers into bores formed in earth structures (such as mine roofs). In the depicted embodiments, the Accessory comprises an elongate body having a driver element with a pin or boss at one, lower, "driven" end of the body for engaging and supporting an end of a stabilizer, and a second driver element with a socket, at the opposite, upper, "driving" end of the body for receiving an insertion tool. The latter driver element can be pivotably offset, to accommodate an angled, unobstructed address of the insertion tool to the upper end of the body, and to enable a linear insertion of a stabilizer, supported on the lower end of the body, into a bore.

Abstract: The invention comprises an arrangement, for use particularly in connection with a rotary displacement machine such as an air compressor, in which the fluid (air) compressed in the machine is employed to supply lubricant cyclically to the mating or coacting surfaces of the confined rotary piston and the walls of the compression chamber. A lubricator valve, having a translating piston and integral stem, is employed to extract oil from a repository supplied by an oil pump, and introduce it into a tapped-off compressed air line for pressurized injection into the compressor.

Abstract: A first pressure-intensifying apparatus includes a working cylinder having a working piston mounted within it and reciprocally movable by the application of working fluid alternately to opposite sides of the working piston. The working piston in turn drives a high-pressure piston movably mounted within a high-pressure cylinder. The flow of pressurized working fluid to the working cylinder is controlled by a control valve. The control valve receives pressurized fluid from a source of working fluid and directs the fluid to the working cylinder and then back to a working fluid reservoir or tank. The control valve includes a valve body and has a spool movably mounted therein that is movable between a first position in which fluid is directed to one side of the working piston and a second position in which fluid is directed to the other side of the working piston.

Abstract: The valve, according to the illustrated embodiment, comprises an annular chamber formed of concentric inner and outer walls, the outer wall having, in the periphery thereof, a multiplicity of equally spaced apart rectangular slots. An annulus, having a corresponding multiplicity of slots, is rotatably journalled, concentrically, on the outer periphery of the outer wall in order that, upon rotation thereof, relative to the annular chamber, the slots in the wall, and those in the annulus, come into or out of registry. A crank mechanism is coupled between the annulus, and the structure defining the annular chamber, to selectively rotate the annulus through a limited arc to bring the slots into and out of such registry. The valve is used to throttle the velocity of compressed gas product conducted thereto by a gas compressor, and to subdivide compressed gas issuing therefrom into a multiplicity of fine jets.

Abstract: The machine, in the embodiment shown, is an air (or gas) compressor having a housing with parallel, intersecting bores in which are rotatably journaled coacting, meshing helical rotors. The rotors, male and female, are of the asymmetrical type. Confronting concave and convex surfaces of portions of the grooves and lobes of the rotors, for having different arcuate conformations along principal lengths thereof, define a void of varying width therebetween. However, other, minor extents of the confronting surfaces are defined of a common arc and, therefore, nestably conform with each other (a) to reduce contact stress therebetween, (b) to improve rotor-to-rotor sealing, and (c) to accommodate therebetween a significant film of oil.

Abstract: In the embodiment disclosed, the invention comprises a single, dual-piston cylinder, operable by hydraulic fluid, interpositioned between a pair of pivotably coupled, vehicular units. The cylinder is pivotably secured to pivot coupling elements which join the units, and each piston has its translating rod pivotably coupled to one of the units. Ports opening into the cylinder admit and discharge operating, pressured, hydraulic fluid (a) to displace the pistons apart, whereby a first crab steering is effected, (b) to move the pistons into mutual proximity, whereby a second, alternate crab steering is affected, (c) to displace the pistons in unison, in a first direction, whereby a left-hand or right-hand steering is effected, or (d) to displace the pistons in unison, in an opposite direction, whereby the opposite-handed steering is effected.

Abstract: A skid is disclosed which is particularly suitable for supporting rotating machinery in environments where it is exposed to temperature variations and external mechanical forces and where failure of the machinery can result in the generation of an extremely high torque which has to be absorbed. The skid basically comprises a machinery support platform which is connected to an elongate torsion resisting member in torque transmitting relationship and only three spaced supporting members each incorporating a universal joint and rigidly connected to the torsion resisting member. The torsion resisting member is preferably of hollow circular cross-section throughout its length and is disposed below the medial center line of the support platform and the three supporting members are disposed at the corners of an isosceles triangle and incorporate means allowing for limited movement of the torsion resisting member relative thereto.

Abstract: In the embodiment shown, the valve has a seat and a stop plate with valving elements therebetween. The seat has pluralities of openings formed therein, and the stop plate has a central void. The valving elements move, to open or close off communication between the openings and the void, in response to pressured fluid. Each element controls fluid flow through a pair of openings. The valve seat has angularly-formed lands with which the elements, correspondingly angularly formed, nest to close off fluid communication through the valve.

Abstract: Broadly, the structures of the invention comprises a friction rock stabilizer and a sheath therefor to isolate the stabilizer from the surface of an earth structure bore and its associated corrosion environment, and bonding between the engaging surfaces of the stabilizer and sheath. The sheath, of low-friction polyethylene (although other suitable material could be used), facilitates stabilizer insertion into the bore. Additionally, the polyethylene sheath is heat and pressure sensitive. Insertion of the stabilizer generates considerable frictional heat and pressure and, as a consequence, upon the stabilizer being fully inserted, the sheath fuses onto the exterior, interfacing surface of the stabilizer.

Abstract: An embodiment of the article comprises a metallic body formed, by a powder metallurgy technique, of steel powder and tungsten carbide particles, and forged, having a total density of not less than one hundred percent. The method, then, comprises (a) the powder metallurgy steps of forming and sintering the body, and (b) the subsequent forging step, to produce the one hundred percent total density steel and tungsten carbide article.

Abstract: The assembly has a submerged root, turbine-wheel-blading configuration, and utilizes circumferentially oriented, buried, friction damping wires, and continuous, overlapping, tip shrouds to minimize vibratory response. The wires, in the presence of blade vibration, simultaneously rub on both the blades and surfaces of a recess in the wheel in which the blade roots are fixed. The continuous tip shrouding provides additional damping through shroud-to-shroud interface rubbing. The assembly has a stack of identical blades, obviating any need for relatively weak locking blades or pieces. The method defines the steps of forming a peripheral recess in a wheel, in which to secure root ends of blades, and setting the damping wires (or wire) therein prior to installing the blade root ends, and uniformly spacing-apart the blades after securing the same to the wheel.

Abstract: The Assembly has a submerged root, turbine-wheel-blading configuration, and utilizes circumferentially oriented, buried, friction damping wires, and continuous, overlapping, tip shrouds to minimize vibratory response. The wires, in the presence of blade vibration, simultaneously rub on both the blades and surfaces of a recess in the wheel in which the blade roots are fixed. The continuous tip shrouding provides additional damping through shroud-to-shroud interface rubbing. The assembly has a stack of identical blades, obviating any need for relatively weak locking blades or pieces. The method defines the steps of forming a peripheral recess in a wheel, in which to secure root ends of blades, and setting the damping wires (or wire) therein prior to installing the blade root ends, and uniformly spacing-apart the blades after securing the same to the wheel.

Abstract: The valve, in the exemplary embodiment shown, comprises a gas inlet or intake valve for use with a gas compressor. It has a valve body with a gas inlet opening and a gas discharge opening, the latter for communication with the gas inlet of a compressor. A pair of concentrically-engaged pistons, relatively movable therebetween, cooperate to open, close, and throttle communication between the valve inlet and discharge openings. A first, compression spring, reactive from the valve body, urges the piston pair in a first closure disposition, to prevent gas flow through the valve body, and a second, compression spring, reactive from one of the pistons of the pair thereof, urges the other piston to a second, open disposition, to accommodate gas flow through the valve body.

Abstract: In the exemplary embodiment shown, the vehicle is a drum-type asphalt compactor having a pair of drum-compactor units coupled together for steering articulation. The units have prescribed axes of travel, and are coupled together for travel with the axes in line with, transverse to, or offset from, each other. A hydraulic piston and cylinder actuator displaces a coupling link, which is commonly, pivotedly joined to the units, to bring the travel axes into a transverse disposition. Another link or lock bar, freely engageable and disengageable from one of the units, is used also to couple the units together for the purpose of cooperating with the actuator and coupling link to bring the travel axes into an offset, parallelism.

Abstract: The embodiment depicted comprises a pair of coacting rotors, in a rotary compressor, having interengaging lobes and grooves, the rotors being journaled in intersecting bores in a housing. The circumferential surfaces, and end walls of the bores are polymer-layered, and the rotors carry abrasive to machine the polymer to define an optimum clearance for rotor rotation within the bores, and in coaction together. Each rotor is polymer-coated and abrasive particles are borne in the polymer on the outer edges of the lobes and in discrete radial patterns on the rotor sides. The method defines the polymer-coating and abrasive particles-deposition steps.