Abstract:
A mechanical drive mechanism of the endless belt and pulley type having an improved belt tensioning arrangement. The shaft of the machine being driven (or that of the driving member itself) is eccentrically journaled with respect to its cylindrical bearing hub and a rigid arm having a first bore therethrough is disposed with the hub of the machine centered in that first bore. Located at the opposed end of the rigid arm is a parallel bore in which the other drive or driven shaft is journaled. Because of the eccentricity between the first shaft and its hub, as the arm is rotated about the hub as a center, the distance between the centers of the driving and driven shafts is increased or decreased, depending upon the direction of rotation of the rigid arm. As such, the tension of the endless belt coupling the drive and driven pulleys can be varied. The construction of the belt and pulley combination lends itself to being completely enclosed in a protective shroud which need not be removed to make the tensioning adjustment.
Abstract:
A multi-cylinder pump for delivering fluids under high pressure which includes a multi-lobed camshaft having bearing supported yoke elements disposed in an oil-filled crankcase for coupling the camshaft to plural piston elements such that displacement of the plural piston elements occur in a desired phase relationship and improved sealing arrangements disposed between the piston and the cylinders, between the suction inlet port and the high pressure outlet port and between the cylinders and the oil-filled crankcase to prevent cross-contamination of the oil lubricant and the fluid being pumped and to prevent any substantial leakage between the high pressure outlet port and low pressure inlet port during the suction and pressure strokes of the pistons.
Abstract:
A high pressure fluid handling pump of the type having a drive shaft for connection to a drive motor where the drive shaft extends longitudinally through a pulsation dampener affixed to the pump's housing. The pulsation dampener comprises a cup-shaped housing having a pump shaft receiving bore extending through an end wall thereof and which, when secured to the motor housing, defines a hollow chamber in fluid communication with the pump's outlet. Disposed within the hollow chamber of the pulsation dampener housing and concentric with the motor's shaft is a rigid baffle member. Surrounding that is a tubular diaphragm formed from an elastomeric material of a predetermined durometer hardness, the tubular diaphragm effectively dividing the hollow chamber into two compartments isolated from one another. One compartment is exposed to the pressure surges occurring in the fluid being pumped through slits formed in the baffle member and the other compartment is pressurized by a compressible fluid to a predetermined pressure value.
Abstract:
Improved multi-cylinder pumps wherein a plurality of co-planar positioned connecting rods are radially disposed about a crankshaft and wherein a plurality of generally cylindrical spool-like wrist pins are rotatively coupled to the connecting rods. The improvement comprises an assembly wherein the wrist pins have opposed end regions bordering a smaller diameter central region that contains one or more ring receiving grooves and which wrist pins are mountable in overlapping relation to retainer ring containing grooves formed in the connecting rods. Upon mounting retainer rings in the connecting rod grooves and inserting and rotatively locking the wrist pins in the connecting rods, the connecting rods, wrist pins and retainer rings are integrally locked together in radially extending relation.
Abstract:
Multi-cylinder in-line and radial pumps having an improved structure for coupling the piston heads to the crankshaft such that the number of parts commonly employed and the size of the resulting pump is greatly reduced when compared to prior art pumps now on the market. Both in-line piston pumps and radial diaphragm pumps are included. The connecting rods comprise plates, each having a bore through the thickness dimension thereof for receiving a cylindrical lobe formed eccentrically on the pump's crankshaft. Formed on one end of each of the connecting rods is a generally cylindrical bore, also extending through the thickness dimension of the connecting rod, the center of this bore being displaced inwardly of the end edge surface of the connecting rod by a distance which is less than the radius of the bore. A cylindrical wrist pin having a flat formed on a peripheral surface thereof is insertable into the bore or recess at the end of the connecting rod and when the pin is rotated so that its flat portion is aligned parallel to the end edge of the connecting rod, it is firmly locked in place but rotatable or floating within the recess. A bore formed perpendicular to the flat on the floating wrist pin is threaded to receive a bolt used to fasten the plunger rod to the floating wrist pin. Other features of the pumps of the present invention include a cylinder head designed to receive sleeve inserts of differing sizes whereby pistons of differing cross-sectional areas can be utilized to vary the capacity of the pump, and grooved shoulders on the connecting rods to cooperate with holding rings around the crankshaft.
Abstract:
An improved pressure and vacuum seal arrangement for a piston-type pump utilizing a reciprocating plunger disposed within a cylindrical sleeve. The cylindrical sleeve is provided with a pressure seal assembly adjacent the outer end thereof and a vacuum seal assembly adjacent the inner end thereof, along with an annular groove formed between the two seal assemblies to isolate the vacuum seal from the pressure seal. The annular groove, which extends around the entire inner peripheral surface of the cylindrical sleeve is in communication with the pump inlet. The pressure seal assembly comprises a generally "U"-shaped cup held between inner and outer retaining discs, and wherein the inner retaining disc is disposed with its inner peripheral edge surface in normal running contact with the surface of the plunger and with the inner disc consisting of polytetrafluoroethylene. The vacuum seal assembly comprises a carbon guide adjacent the inner end of the cylindrical sleeve and an adjacent vacuum seal sleeve formed of polytetrafluoroethylene. The polytetrafluoroethylene sleeve is disposed outwardly of the carbon guide and resilient means are provided for biasing the inner peripheral surface of the vacuum sleeve against the outer peripheral surface of the plunger.
Abstract:
A roller pump comprising a generally cylindrical housing and a generally cylindrical rotor disposed eccentrically within the housing, and having push rods arranged radially within the rotor for assisting in forcing radial motion of the rollers within the rotor during rotation of the rotor within the housing. A camming shaft is disposed within the housing, and arranged generally with the housing, the push rods making contact with the periphery of the camming shaft in order to provide radial motion of the push rods during rotation of the rotor. The cross-sectional dimension of the push rods is preferably equal to at least 331/3 percent of the axial length of the rollers, and secondarily preferably having a diameter generally equal to the roller diameter. The cross-sectional dimension of the push rods at the line of contact with the roller surface enables the pump to effectively handle highly viscous products.
Abstract:
A hydraulic motor of the Gerotor-type which is designed for rotation in both the clockwise and the counterclockwise direction and which includes a pair of relief valves arranged to protect the motor shaft seal, irrespective of the chosen direction of rotation. The Gerotor element also includes a pair of motoring grooves which cooperate with a feed channel formed in the surface of the motor end plate and with a corresponding shadow feed channel on the opposite motor front plate to equalize the forces on the rotor element of the Gerotor and thereby prevent distortion and binding of the rotor element due to thrust forces thereon. Similarly, to prevent excessive forces on the end of the motor shaft, a relief groove is provided between the normal low pressure outlet port and the bearing chamber in the end plate, such that the hydraulic force acting on the end of the shaft tending to urge it in the axial direction is no greater than the product of the cross-sectional area of the shaft and the pressure maintained at the low pressure side of the motor.
Abstract:
A bypass and unloader valve capable of operation as a full unloader valve or volume control for fluid pressure systems. The structure utilizes a valve body having an inlet, an outlet, and a bypass, with check valve means being provided to accommodate normal flow from the inlet to the outlet. When the pressure rises in the outlet, this pressure is applied against a reciprocatory plunger, and the force generated lifts the plunger, and a stem extension coupled to the plunger unseats a check valve, thereby opening a fluid path from the inlet to the bypass. Improved guide and sealing means are provided for the plunger and associated stem assembly, the plunger and stem being spring biased to accommodate normal flow.
Abstract:
A unitary inlet and outlet valve means for fluid flow control comprising a unitary body in the form of a hollow sleeve having coaxially arranged inlet and outlet valves. The sleeve housing means includes an inlet at one end thereof, and a flow chamber at the opposed end thereof, and with an annular flange extending outwardly from the sleeve adjacent the flow chamber. The central bore through the sleeve member provides a housing and seat for the inlet poppet, and an annular spring-biased ring controls fluid flow through bores formed in the flange and communicating between the flange and the flow chamber. The individual valves open upon opposed inwardly directed movement, thereby shortening the overall length of the valve body.