Abstract: A spool valve is positioned within the reservoir of a hydraulic shock absorber. The valve body is secured to the pressure tube of the hydraulic cylinder and has openings aligned with ports therein. The spool has threads engaging threads on the valve body so that as the spool is rotated the spool is moved axially to cause the lands on the spool to cover more or less of the openings in the valve body. A rotatable shaft device extends radially through the external housing and into the reservoir. At its inner end the shaft device has a gear which engages a gear on the spool so that as the shaft device is rotated the spool also is rotated.

Abstract: A heavy duty hydraulic shock absorber having an inner tube in which is slidably mounted an impact receiving piston assembly. Upon application of an impact force on the piston assembly, the piston assembly is moved inwardly of the inner tube and fluid from the inner tube is metered through a plurality of exponentially disposed metering orifices into an accumulator chamber formed between the inner tube and an outer tube which encloses the inner tube. An adjustable, slidable metering spool is operatively mounted in the accumulator chamber, over the metering orifices, for regulating the flow of fluid through the metering orifices into the accumulator chamber.

Abstract: A shock absorber of the kind having an infinitely adjustable damping characteristic comprises a main cylinder containing a piston fixed to a piston rod which extends from the main cylinder and liquid within the cylinder acting on the piston. The main cylinder has openings for the flow from it of the liquid upon movement of the piston in the cylinder and an adjustment device is provided for restricting these openings to provide the adjustment of the damping characteristic. The openings are situated in the peripheral wall of the main cylinder and are axially spaced apart from each other in positions in which they are successively passed over and closed by the piston as the piston approaches the end of its stroke at one end of the main cylinder in a damping movement. Thus the flow of liquid from the main cylinder is progressively further throttled by closure of the openings as the piston approaches the end of its movement.

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 spring device including a piston slidably disposed in an inner cylinder of a dual inner and outer cylinder with a piston rod secured thereto and extending to the outside of the cylinder through a rod guide closing one end of the inner cylinder, an oil passage formed in the rod guide and connecting an annular chamber between the inner and outer cylinders with the interior of the inner cylinder, and a device for supplying a force on the piston to project the piston rod outwardly, in which a guide member is supported on the piston rod with a coil spring interposed between the guide member and the piston, and the guide member is adapted to contact the rod guide to control the oil flowing through the oil passage when the piston rod moves outward by a predetermined amount.

Abstract: A shock absorber for providing a linear decelerating force to a machine part by a piston forcing fluid through a series of orifices formed by the coaction of holes in the piston cylinder and grooves formed on the internal diameter of a sleeve which fits over the cylinder. The absorber is constructed with asymmetrical tabs formed on the cylinder in such a manner as to allow the insertion of the piston into the cylinder without any special inserting tools and the asymmetry eliminating the possibility of an improper assembly of the cylinder to a retainer structure.

Abstract: An adjustable hydraulic shock absorber of the dashpot type which includes an elongated outer tube and an inner tube fixed in said outer tube. A piston is movably mounted in the inner tube and has a piston rod extended outwardly of the outer tube for receiving reciprocating actuating loads. A double action, flexible, tubular diaphragm is positioned in the outer tube, with its inner end secured to the outer tube in a position surrounding one end of the inner tube, and with its outer end secured to the piston rod, so as to form an expandable fluid reservoir. The reservoir is connected by passageway means to the inner tube. The reservoir, passageway means and inner tube are normally filled with fluid under pressure so as to normally move the piston to an initial load receiving position.

Abstract: A vibration damper with a hydraulic damping mechanism for vehicle spring systems, in which damping valves operating by throttling the pressure medium displaced out of one working space into the other working space are interconnected between two working spaces of the hydraulic pressure medium; the two working spaces are short circuited by a by-pass connection by-passing the damping valves whereby a by-pass valve is also interconnected into the by-pass connection which operates as a function of oscillation velocity and whose valve adjusting member adjusts the by-pass connection to a narrower cross section with rising oscillation velocities.

Abstract: An adjustable kinetic energy absorbing device wherein a piston is moved in response to an applied impact force along within a tube defining a chamber containing hydraulic fluid. The tube has a plurality of orifice openings therein spaced therealong in the direction of movement of the piston, and an elongated path is defined outwardly of the chamber, preferably in the outer surface of the tube, and in fluid communication with the orifice openings. The path is relatively narrow in width and extends along the tube. An elongated flow control element is supported in the device and movable lengthwise along the path in response to manual operation of an adjustment assembly including a cam operatively engaging the elongated element. The flow control element has formations spaced therealong adapted to register with the orifice openings to control flow of hydraulic fluid through the openings in response to movement of the element.

Abstract: A sleeve is rotatably mounted on the main body and the two define a reservoir cavity therebetween. Projections integral with the body extend radially through the reservoir cavity to contact the inner wall of the sleeve. Spaced axially along the cylinder are a plurality of openings which extend through the projections from the cylinder cavity to the outer end of the projections. On the inner wall of the sleeve in juxtaposition to the outer end of the openings are a plurality of generally annular grooves. The oil path or duct for release of oil from the cylinder cavity to the reservoir cavity when the piston moves inwardly is through the openings and those parts of the grooves at the distal ends of the projections. In one embodiment these grooves vary in cross-sectional size throughout their length. In another embodiment they are helical, at a slight angle to the axis of rotation.

Abstract: A shock absorber for providing a linear decelerating force to a machine part by means of a piston which forces fluid through a series of orifices formed by the coaction of holes in the piston cylinder and grooves formed on the internal diameter of a sleeve which fits over the cylinder. One form of groove is disclosed which varies in depth about the perimeter of the sleeve and has an inclined sidewall which varies the width of the groove on the internal diameter of the sleeve as a function of its depth. An alternative form of groove has a constant depth and is formed spirally on the sleeve with a pitch that is an integral divisor of the hole spacings. A series of orifices having a low ratio of length to width are formed by the coaction of the holes and the grooves and are adjustable by rotating the cylinder relative to the sleeve.

Abstract: A shock absorber including a housing having a ram slidably extending therefrom. A pair of concentric control sleeves divide the housing into inner and outer fluid chambers, and a piston is slidably received within the inner chamber. The inner sleeve has an axially aligned row of openings therein, and also has an elongated groove formed in the outer periphery thereof, which groove is circumferentially spaced from the row of openings. The inner and outer sleeves have opposed conical surfaces forming a narrow clearance space therebetween. A spring coacts between the housing and the outer sleeve for urging same axially in a direction whereby the openings in the inner sleeve are effectively closed, as by maintaining the narrow space at a minimum dimension. When a shock load is imposed on the ram causing the piston to move inwardly within the inner chamber, the fluid therein is pressurized and flows through the openings into the narrow space.

Abstract: A shock absorber of the kind having an infinitely adjustable damping characteristic comprises a cylinder containing a piston fixed to a piston rod which extends from the cylinder and liquid within the cylinder acting on the piston. The cylinder has openings for the flow from it of the liquid upon movement of the piston in the cylinder and means are provided for restricting these openings to provide the adjustment of the damping characteristic. The openings are situated in the peripheral wall of the cylinder and are axially spaced apart from each other in positions in which they are successively passed over and closed by the piston as the piston approaches the end of its stroke at one end of the cylinder in a damping movement. Thus the flow of liquid from the cylinder is progressively further throttled by closure of the openings as the piston approaches the end of its movement.

Abstract: A shock absorber having a pressure tube with metering bores defining metering orifices through which fluid is metered upon application of impact forces to a piston assembly slidable in the pressure tube, and an adjustable metering sleeve with ports adjacent the metering orifices for regulating the flow of fluid through the orifices.

Abstract: A shock absorber having passageways through which fluid is metered from a primary chamber upon application of an impact force to a piston assembly slidable in the chamber, and an adjustable flow control member for regulating the flow of fluid through the passageways to an accumulator chamber within the flow control member.