Abstract: A filter assembly including a base for supporting and providing fluid connection to a removable filter cartridge, the base having a hollow connecting end for mating with the cartridge, a removable filter cartridge comprising a filter medium and having a connecting end shaped to mate coaxially with the end of the base in a rotatable, telescopic relationship, the connecting end of one of the base and the cartridge having lug means extending radially toward the end of the other, the other connecting end having corresponding passage means for lockably receiving the lug means, the telescopically related mating ends of the base and cartridge providing radially opposed surfaces of circular cross-section about the mutual axis of the connecting ends of the base and cartridge, and a circular elastomeric sealing ring providing a radial seal between the circular cross-section surfaces, preventing liquid flow past it between the telescopic ends.

Abstract: A fluid filter and methods for manufacturing same are described. The fluid filter includes: a filter element; a plastic housing for the filter element; and a plastic closure member including fluid inlet holes, each having an axis which is angled outwardly relative to the longitudinal axis of the filter housing. The closure member and the housing can be connected by welding, or the housing and the closure member may include complementary interengageable locking means for engagement. One method of manufacture includes the steps of forming a plastic housing and closure member and spin welding them together. Another method includes the steps of: forming the housing and closure member with complementary interengageable locking members; aligning the locking members; and turning the housing to engage the housing and the closure member. With either method, the assembled filter is then spun onto a threaded stud on a filter mount.

Abstract: A pressure relief valve assembly is described including a valve body having a sleeve portion, a slotted portion and axial extension legs, all of which are integrally formed as one-piece by injection molding from plastic. The legs are hooked at free ends to restrain a compression spring which biases a one-piece, plastic washer into a seated position over the slotted portion. The washer is substantially planar, but with inner and outer circumferential lips, each having a rounded profile. The lips are spaced apart by a medial planar surface area. The inner and outer lips engage inner and outer surfaces, respectively, around radial slots formed in the slotted portion which act as a valve seat. The washer also includes an upwardly extending projection opposite the sealing surface which receives the spring radially inward such that the spring exerts an even force on the washer.

Abstract: An annular thrust ring for use in a mechanism that causes the confronting teeth of two clutch members to automatically separate when the driven clutch member has sufficient speed to overtake the drive clutch member. The annular thrust ring has a V-shaped cross-section formed by progressive dies to facilitate lower production cost.

Abstract: An electromagnetic fluid pump having a generally cylindrical housing divided into an inlet chamber, an outlet chamber and an intermediate chamber by a pole member and a separator plate. The pole member is sealingly attached to the wall of the housing and divides the inlet chamber from the intermediate chamber. A first O ring provides a gas tight seal between the pole member and a piston guide which provides a fluid passageway between the inlet chamber and the outlet chamber. The separator plate is sealingly attached to the end of the piston guide adjacent to the outlet chamber and separates the outlet chamber from the intermediate chamber. A second O ring provides a gas tight seal between the internal wall of the housing and a rim portion of the separator plate. An electrical connector having a connector pin provides electrical power to an electronic circuit periodically energizing a solenoid coil to reciprocate a piston disposed in the piston guide.

Abstract: A manifold flame arrestor system for use with an internal combustion engine having a plurality of cylinders, each cylinder having an intake port and means of ignition of combustible mixtures drawn into the cylinder through the intake port, and an intake manifold connecting the intake ports of a plurality of cylinders, the system serving to reduce the possibility of transmission of combustion producing flame from a cylinder into the intake manifold comprising a flame arrestor positioned between the intake manifold and each cylinder intake port, each flame arrestor permitting passage of combustible mixtures therethrough but prohibiting the passage of flame therethrough.

Abstract: A filter assembly including a base for supporting and providing fluid connection to a removable filter cartridge, the base having a hollow connecting end for mating with the cartridge, a removable filter cartridge comprising a filter medium and having a connecting end shape to mate coaxially with the end of the base in a rotatable, telescopic relationship, the connecting end of one of the base and the cartridge having lug means extending radially toward the end of the other, the other connecting end having corresponding passage means for lockably receiving the lug means, the telescopically related mating ends of the base and cartridge providing radially opposed surfaces of circular cross-section about the mutual axis of the connecting ends of the base and cartridge, and a circular elastomeric sealing ring providing a radial seal between the circular cross-section surfaces, preventing liquid flow past it between the telescopic ends.

Abstract: A multi-layered insulating piston cap for cast metal pistons having an insulating, perforated metal sheet layer. A piston cap is provided having a top sheet continuous layer made of a heat and corrosion resistant metal for protecting the piston cap, a second layer made of heat and corrosion resistant metal sheet having a plurality of spaced apart perforations for providing trapped air spaces, a third layer made of a heat and corrosion resistant metal foil for sealing the perforations, and a fourth layer or porous, heat and corrosion resistant metal for anchoring the piston cap to the piston. One coined geometry can be used when blanking various sized cross-sections of piston cap.

Abstract: A low pressure metering pump having a hollow piston reciprocated in a cylindrical guide by a solenoid coil. A pair of check valves provide for unidirectional fluid flow through the cylindrical guide in response to the reciprocation of the piston. A seal attached to the piston prohibits a fluid backflow between the external surface of the piston and the internal surface of the cylindrical guide. A bumper seal at the output end of the piston prevents fluid flow through the cylindrical guide when the solenoid coil is de-energized. A control circuit periodically energizes the solenoid coil at a frequency determined by a variable resistance responsive to predetermined operational parameters. In a preferred embodiment, the metering pump is a fuel control element for a heater and the variable resistance is a thermistor or similar type of temperature sensitive resistance, which controls the rate at which fuel is delivered to the heater.

Abstract: Centrifugally disengageable engine starter gearing for selectively starting an engine having a starting gear.

Abstract: A low pressure metering pump having a hollow piston reciprocated in a cylindrical guide by a solenoid coil. A pair of check valves provide for unidirectional fluid flow through the cylindrical guide in response to the reciprocation of the piston. A seal attached to the piston prohibits a fluid backflow between the external surface of the piston and the internal surface of the cylindrical guide. A bumper seal at the output end of the piston prevents fluid flow through the cylindrical guide when the solenoid coil is de-energized. A control circuit periodically energizes the solenoid coil at a frequency determined by a variable resistance responsive to predetermined operational parameters. In a preferred embodiment, the metering pump is a fuel control element for a heater and the variable resistance is a thermistor or similar type of temperature sensitive resistance, which controls the rate at which fuel is delivered to the heater.

Abstract: A check valve having a dual valve seat, a valve member, a retainer, and a valve spring. The dual valve seat has a cylindrical body having an axial bore therethrough. A conical valve seat is provided at one end of the axial bore and a flat valve seat is provided at the other end of the axial bore. A recess is provided in the face of the cylindrical body at the end having the conical valve seat to form a first retainer seat and an annular recess is provided about the flat valve seat to form a second retainer seat by inverting the valve seat, the check valve may accept either a stem valve member having a conical sealing surface or a flat valve member having a flat sealing surface. The embodiment of this check valve in an electromagnetic fluid pump permits it to have different operating characteristics depending on which valve member is used.

Abstract: A plastic relief valve assembly is provided having a one-piece valve body, with a sleeve portion and a slotted portion, and a valve. The slotted portion includes a plurality of radially disposed inlets. The valve includes an axial portion and a radial portion. The radial portion extends angularly over the radial inlets in a seated position and the axial portion extends into the valve body for quick connection therewith by a groove and rib combination provided on the valve and valve body, respectively. The radial portion of the plastic valve is flexible, and the valve opens when fluid pressure reaches a predetermined level. A plastic antidrain valve is also connected to the valve body. A fluid filter incorporating the combined plastic relief valve assembly/antidrain back valve is also provided.

Abstract: A porous composite structure for controlling of gas flow therethrough. The porous composite structure includes a first porous element formed from a sheet having a plurality of perforations with a first total predetermined cross-sectional area. A second porous element formed from a perforated sheet having a second total predetermined perforation cross-sectional area is disposed parallel to the first porous element and spaced a predetermined distance therefrom. At least one intermediate porous element is interposed the first porous element and the second porous element. The intermediate porous element has a total predetermined cross-sectional pore area which is less than the first and second total predetermined cross-sectional areas.

Abstract: Centrifugally disengageable engine starter gearing selectively starting an engine having a starting gear. The engine starter gearing includes a power shaft, a sleeve slidably secured to the power shaft, a pinion gear slidably mounted to the power shaft and movable into engagement with the starting gear, a driven clutch member secured to the pinion gear and having an annular or circular recess with an inclined or conical surface therein, a driving clutch member mounted to the sleeve, mutually engageable clutch teeth on the driving and driven clutch members, a barrel housing having an open end and being at least partly fitted over the driving and driven clutch members, an abutment confining the driving and driven clutch members within the housing, a resilient member biasing the driving and driven clutch members into mutual engagement, and a radially inwardly extending shoulder on the driving clutch member adjacent the circular recess.

Abstract: An electromagnetic fluid pump having a magnet attached to a reciprocating piston and a hall effect switch detecting the magnetic field generated by the moving magnet. In a first position of the magnet, the magnetic field through the hall effect switch is in a first direction causing the hall effect switch to generate a signal having a first polarity. In a second position of the magnet the magnetic field through the hall effect switch is reversed, reversing the polarity of the signal generated by the hall effect switch. An electronic switch circuit responsive to the signal generated by the hall effect having the first polarity to energize the solenoid coil to retract the piston from the first position to the second position against the force of a spring and further responsive to the signal having a reversed polarity to deenergize the solenoid coil when the piston is in the second position.

Abstract: A centrifugally disengageable engine starter gear of the positive shift type that has a clutch to provide for driving and indexing of the starter gear, an internal mechanism keeps the clutch teeth in engagement during the indexing function, and a centrifugal separator separates the clutch teeth in an overrunning condition. The separator includes radially movable centrifugal flyweight members circumferentially spaced in a circular recess that contains individually formed flyweight guides that cooperate therewith to prevent excessive circumferential displacement of the flyweights during their radial movement. The method of forming flyweight guides from the clutch housing is also disclosed.

Abstract: A dampener roller cartridge for mounting on a cylindrical support comprising a core tube having a central bore to receive the cylindrical support, the core tube being characterized by having an annular wall thickness of at least one-third the radius of the tube, and a coherent network structure providing a density of less than 0.5, the plastic substance and the network structure providing the tube with sufficient resilience to be resiliently deformed by a radially applied force by a mating roller and to recover its original shape after the cessation of the radially applied force, and further providing the core tube with sufficient rigidity to permit tight slidable mounting of the core tube on the cylindrical support, and a moisture-absorbent, outer sleeve secured about the circumference of the core tube.

Abstract: A high pressure fluid pump having a telescoping cylinder assembly disposed in a cylindrical sleeve. The telescoping cylinder assembly has a stationary member rigidly attached to the cylindrical sleeve and a telescoping member biased towards an outlet port. The telescoping member is reciprocated relative to the stationary member by the displacement of an armature in response to the intermittent energizing of a solenoid coil. An inlet valve connected to the telescoping member and an outlet valve connected to the stationary member provide a unidirectional fluid flow through the telescoping cylinder assembly with the reciprocation of the telescoping member. The outlet valve has a flat valve member which is biased against a valve seat provided at the end of the stationary member adjacent to the outlet port. The flat valve member is preferably made from a resilient elastomer which increases the efficiency of the pump and eliminates forward and back syphoning.

Abstract: A temperature compensating differential pressure indicating device having a lock-out feature requiring internal reset after actuation. The differential pressure responsive indicating device includes a case having an internal chamber and a piston reciprocably and sealingly disposed in the internal chamber. A piston follower is also reciprocably disposed in the internal chamber and abuts against the piston. A first biasing element biases the piston and the piston follower in a first direction while a second biasing element biases these components in the opposite direction, the second biasing element being weaker than the first biasing element. The piston is displaceable in response to the pressure differential between an inlet pressure and an outlet pressure. A shape memory alloy temperature responsive abutment permits the piston follower to move together with the piston at or above a predetermined temperature, while preventing motion of the piston follower below the predetermined temperature.