Abstract: A mixer for liquids and liquid suspensions has a motor drive and housing which is portable and can be carried from tank to tank and attached to the tank where mixing is carried out. The housing depends from the yoke and contains a quill which is driven by the motor drive. A chuck mechanism is associated with the housing and quill to enable mixer impeller shafts to be held in assembled relationship in the mixer and readily removed and replaced with shafts having impellers specially adapted for the particular mixing application of interest. The chuck mechanism is operable even though the quill is hidden in the mixture housing.

Abstract: A mixer impeller made up of paddle shaped blades, which near their tips (e.g., at 90% of the radius of the impeller from its axis of rotation) are of a width at least 40% of the impeller's diameter. The blades also having camber and twist. They are formed by establishing bending moments which form the blades into sections which are curved and flat, with the flat sections being at least in the center area of the base of the blades.

Abstract: A grinder pump which includes a housing; a shaft disposed within the housing having an axis; apparatus for mounting the shaft within the housing for rotational movement thereof; a moveable cutter carried on the shaft, apparatus for coupling the moveable cutter to the shaft to cause rotation of the moveable cutter upon rotation of the shaft. A stationary cutter is carried by the housing and the moveable cutter cooperates with the stationary cutter to perform cutting along respective surfaces of the moveable cutter and the stationary cutter. The respective surfaces of the stationary and moveable cutters are substantially within a plane that is substantially perpendicular to the axis; and apparatus resiliently biases the moveable cutter against the stationary cutter.

Abstract: Mixer apparatus including a high horsepower motor and transmission drive for an impeller, together with associated shafts, impellers and a bearing and seal assembly, are supported on a tank without excessive loading and vibration of the top head of the tank and without special construction to support the apparatus from the foundation. The support structure of the mixer apparatus is provided by a machine base having connected beams on which the motor and the transmission (gear box) are located. A noise containment enclosure on the base may be used to lower radiated noise levels. The impeller shaft and shaft extensions thereof are disposed in telescoping relationship with the transmission, aligned along the same axis. The machine base is parallel to the foundation and is supported on vertical columns, which depend from one end of the base and from opposite ends of a cross beam at the other end of the machine base.

Abstract: An optical projection system has been provided which is particularly suited for use in microlithography and includes a source of exposure energy for generating a beam of energy. A primary lens and mirror are located in the path of the beam for receiving the beam and passing only a portion of the beam therethrough. A refractive lens group is located in the path of the portion of the beam for receiving and transmitting that portion. A recticle element is located in the path of the portion of the beam and has a uniform thickness having a pattern on one surface thereof and an unpatterned portion adjacent thereto. The reticle element is positioned for permitting the portion of the beam to pass through its thickness and for reflecting the portion of the beam back through its thickness and the refractive lens group to the primary lens and mirror.

Abstract: Chuck mechanisms quickly connect and enable quick disconnection of an impeller shaft of a mixer from the drive shaft of the motor unit. A spindle has a keyway which enables a key, either a detent key which is movable in the keyway or a key which is provided by pins extending from the shaft, to be aligned in locking position where the key transfers the thrust from the spindle to the shaft or an unlocked position where the shaft is rotated out of the locking position and may be removed from the spindle. The key is retained in locking position by an outer sleeve or collar having a slot which enables the key to move away from the shaft when the shaft is rotated to the unlocked position. When the collar is rotated to move the slot away from the key, the key is locked against outward movement.

Abstract: The gas outlet of a pipe or other sparging device is encompassed by a cover or cap which is located between the gas outlet and the mixing impeller at the bottom of a vessel. The cap is closed at the top and has a side wall so that the gas bubbles disperse around the lower rim of the wall. The wall may be non-symmetric, such as square in cross section, so as to be at different radial positions with respect to the gas outlet. The gas bubbles, even if released in pulses are distributed spatially and in time. The lower rim is preferable serrated (as a saw tooth edge) with the teeth being of different height, thereby further spreading the distribution of the bubbles as they are dispersed. The overlap or distance between the rim and the gas outlet is such that a sufficient quantity of gas is confined around the outlet to damp pressure pulsations when the pressure of the gas at the outlet does not significantly exceed the hydrostatic pressure at the outlet into the liquid.

Abstract: A three phase voltage regulator system uses a transformer having primary, secondary and tertiary windings for each phase which are closely magnetically coupled to each other and are connected to provide a four wire (wye) three phase output on three hot lines with a neutral line, and a three phase input which is also wye connected, but where the neutral need not be connected to an input neutral line. The voltage across each primary phase winding is regulated by a series connected regulator circuit. The regulator circuit may derive voltages from the respective tertiary winding which either bucks (subtracts from) or boosts (adds to) the input voltage so as to maintain the primary winding voltage substantially constant. A controller which is responsive to the output voltage from the secondary windings controls the regulators and responds to output voltages of their respective phases.

Abstract: This invention relates to cab signalling systems that receive various permissible maximum speed signals and decode the maximum speed signal to inform the engineman of a train of the current maximum safe speed that a train may travel. The apparatus of this invention accomplishes the foregoing by utilizing a single digital filter and a microprocessor to decode the various transmitted maximum speed signals and to verify that the decoded maximum speed signal represents one of the permissible maximum safe speeds.

Abstract: A moveable contact plunger assembly for interconnection of electrical wires between adjacent railway cars. The assembly has a plunger with a shoulder which fits in abutment with a mating shoulder in an aperture of a dielectric connector block. A follower element is arranged for electrical contact with the plunger. A spring is arranged to allow axial deflection of the plunger relative to the follower element and of the follower element relative to the dielectric block shoulder. Electrical continuity between the plunger and the follower element is obtained by means of a wire which is crimped to the follower and to the plunger. A guide pin mounted on the follower element and a guide slot on a spring barrel portion of the plunger coact with the spring so as to allow axial travel of the follower and of the plunger as well as a rotating motion of the plunger during its axial travel.

Abstract: A fluid flow sensor especially adapted for use in solid state electronic system. The sensor employs a heated thermistor in a first sensing network with a temperature compensation means, the two being connected in common to a sensor point. A second network includes a threshold adjusting means and a diode power supply fluctation circuit connected to a threshold point. The two networks are connected in a bridge circuit across a power supply. The thermistor responds to temperature changes associated with air flow changes to produce a change in circuit condition at the sensor point relative to the threshold point. A utility circuit responds to these changes in circuit condition to provide a desired response. The compensation network includes a plurality of diodes arranged to approximate the response of the heated thermistor to changes in power supply voltage such that the voltage at the threshold point closely tracks the voltage at the sensor point in response to any such changes.

Abstract: A shock absorber has a reserve fluid supply chamber near one end and a cylindrical housing portion adjoining the reserve supply chamber containing a spring for biasing a piston to pressurize liquid in the reserve supply chamber. The piston moves a shaft axially carrying an indicating disc, the periphery of which can be viewed through viewing openings in the cylindrical housing when the supply chamber liquid is exhausted. Snap action of the indicating disc is accomplished by a detent ring in a groove about the periphery of the disc and a complimentary groove about the inner periphery of a transparent sleeve that also seals the viewing opening against dust and the like.

Abstract: A multistationed integrated life safety system in which each station will be situated at a diffferent location and have complete capabilities in terms of local fire protection, fire detection, control and/or monitoring and controlling the security of an area. Each station communicates with four adjacent stations so that when an event occurs at one station, that station is programmed to cause that information or that new status to be transmitted to each of the four adjacent stations. Thus, each station will be interconnected or networked to four other stations to provide multiple location control and annunciation so that each station may act independently.

Abstract: A photoelectric smoke detector which operates on the scattered light principle and involves a light source, and a photosensor placed at an angle to the light beam such that it is normally not illuminated, the light source and photosensor being located within a dark detection chamber having air entry ports that restrict ambient light; smoke particles entering the smoke chamber produce interruption of the light beam, thereby scattering light onto the photosensor. The detection chamber is formed within a cup-shaped grill which can be readily removed from the housing by rotation of the grill to disengage a locking mechanism; the grill is provided with an end wall and, integrally formed therewith, spaced inner and outer cylindrical side walls, the inner side wall being defined by baffles which include scoop fins that are used to trap light, but which also function to scoop air into the chamber and cause air turbulence for mixing the smoke particles thoroughly; the outer side wall having windows for entry of smoke.

Abstract: A waveguide having reduced windloading yet a relatively wide bandwidth for the dominant mode of propagation comprises an elongated cylinder having substantially parallel plates forming an interior waveguide portion which in cross-section is a doubly-truncated circle. The plates are symmetrically disposed about the central axis of the elongated cylinder.

Abstract: A method, and apparatus for practicing the method, is provided for the transit of one or more cables through an opening in a bulkhead while preventing electromagnetic interference and electromagnetic pulse energy from passing through the opening. A housing of electrically conductive material is positioned in the opening and secured around its full perimeter in electrically conductive contact with the bulkhead. The sheathing of each cable is treated so that the conductive shield of each cable is exposed. The cables pass through the housing with their exposed shield being within the interior of the housing. The end portions of the housing are sealed, such as by the use of deformable material. Electrically conductive material, such as shot, granules, powder, grease, liquids or the like, is used to fill the interior of the housing to form conductive paths between the shield of each cable and the housing. The material may be in the form of particulates, semi-liquid, or liquid, including conductive coatings.

Abstract: A photoelectric smoke detector operating on a scattered light principle. The photosensor is connected at the input of an operational amplifier, such amplifier functioning as a threshold detector, saturation pulse amplifier and fixed pulse width compensator. Another feature of the invention resides in the provision of a special RC network connected from the output of a first transistor of a flasher section or subcircuit, which provides pulse power to the light source, to the input of a second transistor in such flasher circuit. As a consequence of this arrangement, when the LED serving as the light source tends to age, with a corresponding increase in its impedance, an appropriate signal is fed back from the aforenoted output of the first transistor to the input of the second, thereby to increase the pulse width of the output signal through the LED such that it is no longer, thereby compensating for the fact that it is no longer as bright.

Abstract: A train having at least a pair of control cabs spaced along the train interconnected electrically. Electric signals transmitted between the control cabs allows for fluid braking signals to be propagated from both control cabs toward each other. Each car of the train includes a device for modifying a test signal transmitted between the control cabs in response to a specified condition. The signal modify device can be a tuned circuit and may indicate brake status or a hot journal.

Abstract: An apparatus to monitor a circuit in which an AC voltage source is connected to a plurality of paralleled current consuming loads, such as heaters, including a reactive load in parallel with the current consuming loads at a point in the circuit more distant from the voltage source than any of the current consuming loads being monitored, a phase shift detector connected to the current consuming loads and at a point in the circuit between the voltage source and the nearest current consuming load being monitored, the phase shift detector being sensitive to the shift in current phase induced by the reactor load, and an alarm connected to and actuated by the phase shift detector which provides a warning when the phase shift induced by the reactive load is lost, indicative of a failure in the circuit.

Abstract: A cock and trip switch actuating mechanism for operating a switch inside of a housing, the switch having an energy storage system rotatably mounting on the housing wall and having a cam plate rotatable about a shaft extending perpendicularly of the housing wall, the cam plate having spaced apart notches in the peripheral edge, a switch carriage secured to and moved by the rotatable energy storage plate between switch positions, and a latch mounted on a housing wall juxtaposed to the energy storage mechanism and having a shaft extending through the housing wall, the latch having a reciprocal member which extends to engage a notch in the cam plate to prevent the rotation thereof, the reciprocal member being withdrawn by the rotation of the latching member shaft to permit the plate to rotate in response to energy storage in the springs.