Abstract: A marine propulsion device including a member adapted to be connected to a boat hull, and a propulsion assembly pivotally connected to the member for vertical swinging movement when the member is attached to the boat hull. The device also includes a plurality of hydraulic assemblies, each of the hydraulic cylinder assemblies including a hydraulic cylinder and a piston rod slideably received in the cylinder. The hydraulic cylinder assemblies are mounted between the member and the propulsion assembly to effect the vertical swinging movement of the propulsion assembly in response to movement of the piston rods in one direction relative to the cylinders and in the opposite direction relative to the cylinders. The marine propulsion device further includes a reversible pump including a first port and a second port.

Abstract: A fuel filter unit having a fuel inlet chamber is threadedly mounted on a fuel pump for easy detachment therefrom. A tubular holder is fixed to the fuel pump for receiving fuel flowing out of the fuel filter unit when the latter is replaced. The fuel filter unit has a drain groove for collecting foreign matter trapped in fuel, so that any collected foreign matter will be discarded along with the fuel filter unit at the time of replacing the same. The fuel pump and the fuel filter unit are in fluid communication through an arrangement which includes a connector disposed in the fuel pump, and a fuel inlet pipe is connected to the connector through a side wall of the fuel pump. Therefore, it is not necessary to detach the fuel inlet pipe when the fuel filter unit is replaced.

Abstract: In a flow quantity control valve of the type comprising a rod shaped valve moved toward and away from an orifice formed in a fluid passage for controlling flow quantity of an operating fluid supplied to a power steering device of a motor car, for example, and drive means for reciprocating the rod shaped valve with respect to the orifice, there is provided an annular permanent magnet loosely encircling the rod shaped valve and located close to the orifice for attracting and removing magnetic particles contained in the operating fluid where the drive means is constituted by a solenoid coil and a plunger, current supplied to the solenoid coil is adjusted in proportion to a running speed of a motor car.

Abstract: The invention pertains to vehicle brake actuators of the expansible motor type wherein the actuator includes a cylinder having a piston and piston rod assembly reciprocal therein, a helical spring biases the piston in a braking direction, and a pressurized medium, such as hydraulic fluid, forces the piston in a spring compressing direction. The unique features include a piston drawn from sheet metal wherein the piston rod is pressed thereinto, and the piston seals are retained in position by a wire ring having an interference fit with the piston. Additionally, novelty resides in the use of a retainer formed of wire or of stamped construction having protuberances defined thereon for retaining the cylinder end cap upon the cylinder in a manner to permit ease and safety of assembly, and uniform force distribution.

Abstract: A slurry pump is provided having a self-flushing piston assembly mounted in a mating cylinder. The piston assembly includes a first piston having a peripheral sealing member and a reciprocating piston rod for driving the first piston for pumping action. A second piston mounted adjacent to the first piston includes a sealing member and forms an enclosed chamber with the first piston. A lost motion coupler connects the pistons together and varies the size of the chamber. On the return stroke of the piston assembly, flushing liquid on the non-slurry side is sucked into the chamber as the chamber expands. On the power stroke, the flushing liquid is forced past the second sealing member to remove slurry particles and prevent wear of the cylinder. The disc on the first piston has sufficient flexibility to allow filling of the chamber and an accumulator is provided to control the back pressure after the chamber has been filled on the return stroke.

Abstract: An axial piston pump is provided having a cylinder drum, the end face of which lies against a control bottom pickup element, in which an approximately semi-circular suction channel and an approximately semi-circular pressure channel are located, where each of these two channels extend in the control bottom pickup element to a connection opening, in which case a device for trapping impurities, preferably a sieve, is installed in the suction channel inside of the control bottom pickup element.

Abstract: An improved emergency and service brake actuator for a wedge type brake is of the type which includes a tubular structure extending from the brake and housing an extended end of a stem of the wedge of the brake therein. An emergency brake actuation portion is mounted on the tubular structure and includes an emergency actuation rod extending into the tubular structure. The emergency brake actuation portion is capable of producing axial movement of the emergency actuation rod to cause an end thereof within an interior of the tubular structure to be selectively located at one of a first position toward the brake for emergency actuation of the brake and a second position remote from the brake. The improvement includes a service cylinder mounted on the end of the emergency actuation rod within the interior of the tubular structure and capable of being axially moved therein. A service piston is mounted on the extended end of the stem for sealed movement within the service cylinder.

Abstract: Coaxial bidirectional spool valves are provided for use in fluid systems such as hydrostat systems where flow can proceed in opposite directions, and which direct flow through a unidirectional or multidirectional function such as a filter assembly in the normal direction regardless of the direction of flow in the system. The valve includes a spool valve reciprocably movable between two limiting positions according to fluid pressure differential across the valve and engaging one of a pair of bungee followers in each position, thereby intercepting and controlling flow through a box junction of the fluid line with the lines leading to and from the filter assembly in a manner such that, regardless of the direction of flow in the fluid line, flow proceeds in the same direction in the connecting fluid lines to and from the function.

Abstract: The specification describes a fluid dispensing piston pump that is adapted to be cleaned in places without disassembly of the pump. During the cleaning operation the piston of the pump is positioned in an area of larger diameter at the base of the cylinder such that the seal between the piston face and cylinder is broken. Seals are provided for closing the upper end of the cylinder thereby allowing steam or a cleaning fluid which is introduced through the inlet check valve to fill the cylinder and sterilize the piston face and stem members. Steam is then discharged through the outlet check valve.

Abstract: A rotary actuator (11) having a vane (24) which is pivoted in a chamber (13) by fluid pressure to turn an actuator shaft (18) includes internal sump cavities (41A, 41B) that collect abrasive particles from the fluid and which hold such contaminants away from the path of movement of the vane (24). Shields (49A, 49B) protect the sumps (41A, 41B) from fluid turbulence. A magnetic element (47A, 47B) at each sump (41A, 41B) attracts and holds ferromagnetic particles and may be removed for cleaning without a general disassembly of the actuator (11) and with only a minimal draining of fluid. Actuator (11) durability is increased by reducing wear of moving components and maintenance is facilitated by simplifying cleaning. Among other uses, the invention may be employed in actuators (11) which swing a backhoe (34) relative to a supporting vehicle (32).

Abstract: An electric switch actuated in response to a condition, such as the occurrence of a particular pressure level, is shown to comprise a base having a switch receiving chamber and having an open end closed by a snap-acting diaphragm assembly. A motion transfer pin is slidably mounted between the diaphragm and a movable contact arm to transfer motion from the diaphragm to the arm. The diaphragm is supported on an annular plate used to prevent over pressures from deleteriously effecting the diaphragm and may be used in forming and calibrating the diaphragm for snapping in one direction. An adjustable spring is disposed on the other side of the diaphragm to permit calibration adjustment of the diaphragm for snapping in the opposite direction. The spring is mounted in a housing adapted to be connected to a pressure source. The switch is weatherproofed by providing a skirt which depends from the housing and extends toward and beyond the base.

Abstract: A vacuum motor includes a cylindrical housing with a mount plate at one end and an end wall at its other end terminating in a guide tube. A stem, adapted for connection to an intermittently actuated vacuum source projects into and is secured to the mount plate and is adapted for securing to a support. A cylinder is nested within the housing open at one end and at its other end is axially recessed to define with the mount plate a first vacuum chamber communicating with the stem bore. A hollow reciprocal piston open at one end is sealed within the cylinder a and terminates in a tubular piston rod which projects outwardly of the guide tube adapted for connection to a load to be moved a predetermined distance. The interior of the piston defines with the cylinder a power air chamber communicating with the piston rod and atmosphere. The piston defines with the housing end wall a second vacuum chamber which is in communication with the first vacuum chamber.

Abstract: A vent accumulator for a hydraulic integrator of the type having at least three pistons arranged in end-to-end relationship within an elongated housing. Each piston is adapted to move under hydraulic pressure in a direction away from one longitudinal end of the housing towards the opposite longitudinal end. Each of the pistons, except for the last piston adjacent the opposite end of the housing, is provided with a piston rod operatively connected to the piston next adjacent towards one end of the housing. Each piston is defined as having a first side directed towards one end of the housing and a second side directed towards the opposite end of the housing. Each of the pistons, except for the last two pistons in line, is provided with means for receiving hydraulic fluid under pressure from a load cell on its first side and an air vent communicates on it second side.

Abstract: A piston for a hydrostatic piston machine, especially an axial-piston pump or motor in which the piston is formed with a ball head riding in a slide shoe which is supported by a fluid-pressure cushion against a countersurface, e.g. a swashplate. The piston is formed with a central passage which communicates with a bore in the ball head, this bore being provided with a throttle to prevent the fluid medium from being forced at an excessive rate into the fluid-pressure cushion and thereby lift the shoe from the countersurface. According to the invention, the end of the piston remote from the ball head is provided with a gap filter of large area and narrow gap width to prevent large particles from entering and blocking the passage and the throttle.

Abstract: A hollow piston for a hydrostatic piston machine and especially for a swash-plate-type axial-piston pump or motor, comprises a hollow outer cylinder member which is formed at one end with a ball head and at the other end with a cover. Extending centrally through this hollow piston is a central post having its opposite ends secured to or engaging the opposite ends of the outer piston member and formed with a central bore communicating between a passage in the cover and a passage in the ball head. At least one of these ends of the central post is juxtaposed with a respective end of the piston and the juxtaposed ends are formed with a conical surface and an edge engaging this surface to seal the post to the outer member.

Abstract: Improved lubrication system for multiplex pumps including lubrication reservoir means, pump means, filtration means and valve means.

Abstract: An activated charcoal filter is placed in the vacuum conduit between a brake booster and the point where the conduit is connected to an engine to tap intake vacuum for booster power. When for any reason fuel vapor from the engine tends to flow toward the brake booster the charcoal of the filter adsorbs the fuel vapor. When flow of air returns to the normal flow direction, from the booster to the engine, the fuel vapors are desorbed and returned to the engine. Thus the filter has a self-purging action. This effectively prevents condensed fuel vapor from adversely affecting elements of the booster such as the diaphragm when under some particular circumstances and in certain installations fuel vapor would otherwise be introduced into the booster and condensed.

Abstract: A hydraulic brake booster includes a housing that defines a pressure chamber. A piston slidably mounted in a housing bore is responsive to increasing pressures in the pressure chamber to move relative to the housing to actuate a braking mechanism, such as a master cylinder. The piston carries a sealing ring to slidingly seal the piston to the housing bore and a shield to protect the surface of the housing bore from atmospheric contaminates during long periods, when the hydraulic booster is in a brake-release position. The shield releasably connects to the piston and telescopes into a piston cavity for compact assembly with the piston.

Abstract: A filter and boot combination through which air is supplied to a pneumatically operated servomotor. The boot has a cylindrical body which is fixed to the servomotor housing and an end closure which surrounds an input push rod. The boot has a first series of openings in the end closure and a second series of openings in the cylindrical body to provide a series of air flow paths into the servomotor. A first filter is located adjacent the first series of openings and a second filter has a peripheral surface which abuts the second series of openings in the boot. A chamber is created between the inner periphery of the second filter, the first filter and the push rod. The air flows in the series of flow paths through the filters and is combined in the chamber before presentation to a control valve which regulates the operation of the servomotor in response to an input force supplied by an operator through the push rod.

Abstract: The invention relates to a spring brake assembly of the compressed air type for truck tractor types of vehicles. The brake actuators of the assembly each includes a heavy coil type emergency spring which is held in a compressed state on the back side of a diaphragm by compressed air applied to the front side of the diaphragm during operation of the vehicle. The emergency spring expands to actuate a brake setting push rod when the compressed air is vented from the front side of the diaphragm and this occurs when the vehicle engine is turned off or when there is an accidental loss of compressed air from the brake unit. The emergency spring is housed in a chamber and, due to the movement of the diaphragm, atmospheric air is continually being drawn into and expelled from that chamber. As the brake actuators are mounted on the rear axle of the vehicle, they are in low positions relative to the roadway and the air drawn into the emergency spring chambers thereof is laddened with salt and water.

Abstract: An elongate, portable, hand-operated assembly adapted to create either a negative or positive pressure within the interior thereof, with the device being capable of having a hypodermic needle removably mounted on either end thereof. The assembly may be actuated to create a negative pressure to draw a liquid that may contain entrained particles of solid material into the interior of the assembly. After the assembly has introduced liquid therein in a desired volume, it may subject the liquid to positive pressure to separate particles of solid material such as protein, bacteria and viruses from the liquid.Liquid free of solid particles, may be discharged from the assembly through a hypodermic needle that is removably secured to the assembly. A magnetically attractable body may rest on the filter within the interior of the assembly.

Abstract: A hydraulic cylinder assembly for farm machinery or the like including a tubular elongate cylinder with a smooth inner cylindrical wall and a fluid inlet at a first end with a hollow piston rod slidable therein having an annular piston secured at a first end and slidable within the cylinder wall with the piston carrying axially spaced wear rings and plastic annular sealing rings therebetween and a T-shaped backup ring therebetween, a guide and seal retainer within the cylinder at the second end thereof for the second end of the piston rod held in place by a retainer nut threaded onto the cylinder and carrying a wiper ring in a groove and holding a seal between the guide ring and retainer nut.

Abstract: A piston pump or motor in which each piston has a filter element disposed thereon between the fluid working chambers and the outer circumference of the piston. The filter element permits the passage of small amounts of fluid between the piston circumference and cylinder bore for proper lubrication and pressure balance while preventing solid foreign matter such as dust or grit from entering therebetween.

Abstract: A flow control apparatus for use in a servomotor to control the rate of the flow of air through a hub to a control valve. A push rod has a first section connected to the control valve and a second section through which an operator supplies an operational input signal. A truncated resilient disc holds the first and second sections of the push rod away from each other. A filter surrounds the second section and extends radially to fill the interior of the hub. A series of projections extend rearwardly from the truncated resilient disc along the exterior of the filter. When the operator desires to begin a braking sequence, an input force is applied from the operator through the second section into the truncated resilient disc to the first section to actuate the control valve. With the control valve actuated, air will flow from the atmosphere through the filter into the servomotor.

Abstract: A throttle control that provides accurate and reliable control for a plurty of remote air driven devices. The throttle control employs a plurality of primary valves that are built into a common body with a handle and a plurality of operating levers. The body has a single air supply port which directs air through a common chamber to all of the primary valves. In the body are formed a plurality of separate chambers that communicate the outlet air from the plurality of respective primary valves to the plurality of air conduits to supply air to the respective air driven devices. The handle has a chamber through which exhaust air has a tortious flow path to atmosphere. Each primary valve employs an air control valve and an air vent valve that are sequentially actuated by the associated operating lever. When the lever is not depressed, the control valve is closed and the vent valve is open and vents the air in the supply conduit through the handle chamber to atmosphere.

Abstract: A new filter structure is provided for removing particles from the exhaust gas of a large, single piston engine of low RPM, before passing the exhaust gas through a turbine for the purpose of driving a supercharger. The filter is so constructed as to be able to efficiently and reliably perform its filtering function over long periods of time in the high temperature environment of the piston engine exhaust. It comprises a cylindrical shaped housing having at one end longitudinally extending slits distributed around its circumference and at the other end an annular flange for mounting the filter in the exhaust line. The housing encloses a filter element comprising a hexagonal stacked array of cylindrical tubes and said filter element is retained in said housing by means of multiple resilient brackets, each formed in the shape of an open elongated loop so as to conform generally to the contour of the filter element on one hand and the inside of the housing on the other.