Abstract: A mounting base for supporting a standard footed motor in driving relationship on a C-faced reducer of a gear motor to enable it to be driven by the footed motor without requiring the use of a different interface adapter. The motor mounting base is characterized by having two orthogonally disposed walls one of which has a planar surface adapted for engagement with the C-faced reducer, while the other wall has a planar surface for supporting a footed motor. The planar surfaces are machined to be essentially perpendicular and are further characterized by having sets of apertures through their associated walls for receiving mounting bolts to secure, respectively, the mounting base in operating position on the C-faced reducer and the base to a footed motor.

Abstract: A rotor assembly for a dynamoelectric generator having a spider sub-assembly that is rotatable around a non-vertical axis; characterized by having a plurality of articulated key assemblies positioned in aligned keyways formed, respectively, in the circumferential surface of the spider sub-assembly and in the inner circumferential surface of an annular laminated rotor rim. A base member in each of the key assemblies is formed to exceed by a predetermined length the normal, i.e., unheated, spacing between the rotor rim and the spider. The rotor rim is heated to expand it radially so the base members of the key assemblies can be inserted in the aligned axial keyways in the rim and spider, then the rim is cooled to heat-shrink it against the base members of the key assemblies.

Abstract: A speed switch for a motor has an electrically conductive disc which rotates with the rotor of the motor. A drag member adjacent the disc is mounted for limited pivotal movement and has a permanent magnet linked magnetically with the disc to cause electromagnetic interaction resulting in a force on the drag member which varies with the speed of rotation of the disc. A switch is operated by a movement of the drag member to actuate an alarm or to actuate a protective device for the motor. An improved latching means restrains the drag member from movement until a predetermined rotational speed of the disc is reached. A screw is mounted so that it can be advanced into the gap and withdrawn therefrom to provide a finely adjustable magnetic shunt. The adjustment of the shunt varies the magnetic latching force and thereby the speed causing actuation of the switch.

Abstract: A dynamoelectric machine mounting assembly characterized by having a vertically movable wedge bar that is slidably mounted between one end of a dynamoelectric machine pedestal and a beveled cam block that is welded in a fixed position on a metal foundation soleplate that supports the machine. The wedge bar is driven downward against the beveled cam surface by a plurality of bolts inserted through the wedge bar and threaded into the soleplate. Such downward movement of the wedge bar compresses it between the cam block and the machine pedestal to stress-load the wedge bar and rigidly fix the machine in position on the soleplate so that the machine does not move in an axial direction when thrust loads are applied to it along its drive shaft axis.

Abstract: A combination baffle and deflector for guiding ventilating air in and around a dynamoelectric machine is characterized by incorporating an annulus having integrally formed base, leg and rim portions that enable the baffle and deflector member to be mounted on one end of a dynamoelectric machine to provide optimum air flow control while also providing apparatus for blocking entry of rodents, snakes, and other similar foreign objects into the machine. In a combined form of the invention the unique baffle and deflector member is assembled with an electric motor that has a plurality of axially extending, radially projecting cooling ribs on an exterior surface of its housing. Fin portions integrally formed with the baffle and deflector member are disposed to cooperate with the cooling ribs on the motor housing to provide an efficient and inexpensive screen over one portion of the ventilating passageways through the motor.

Abstract: A tieless bracing arrangement is provided for rigidly supporting the winding end turns of a dynamoelectric machine in relatively rigid operating position. The bracing arrangement is characterized by including an expandable annulus having a spreader that is operable in conjunction with a plurality of slidably mounted dowels to selectively hold the annulus open while it is positioned adjacent to the machine end turns and then to compress the annulus tightly against the end turns to secure them in operating position. A novel method is also disclosed for applying the tieless bracing to a dynamoelectric machine.

Abstract: A discoidal winding structure for dynamoelectric machines has its conductors bonded together by a resinous material. The structure has a flat disc portion containing the coil sides and outer and inner ring portions containing the coil end-heads and other end connections. The coils have their sides and end-heads of shapes which permit them to nest closely together in an annular array of overlapping coils.

Abstract: An earth excavator including apparatus for stabilizing performance by compensating for changes in temperature. The apparatus includes a temperature compensating voltage regulator for regulating and controlling the output voltage of an exciting generator as a function of sensed temperature. The exciting generator supplies field excitation voltage and current to electric motors in the earth excavator. In order to maintain substantially constant current through the motor field windings with variations in temperature of the windings, and therefore to maintain the performance of the motors and thus of the excavator substantially constant with variations in temperature, the exciting generator output voltage is regulated in a manner such that the regulated voltage supplied by the exciting generator is a direct function of the temperature of the motor field windings. The output voltage of the exciting generator is controlled by controlling the average current through the exciting generator field winding.

Abstract: A pneumatic system for controlling admission of gas samples to a toxic gas monitoring sensor, characterized by including an internally isolated, series pneumatic circuit for continuously circulating purging gas through the sensor, in combination with a gas sampling circuit for introducing gas samples from one or more sources into the relatively isolated series circuit. The gas sampling circuit is further characterized by including a calibration loop having a standard gas leak that is periodically energized to assure the accuracy of readings indicated by the gas sensor in the internal isolated series loop. Also, the gas sampling circuit includes a zero gas source that is selectively operable to feed purifying gas into the gas sampling circuit and thence to the series circuit including the sensor in order to enable flow meters in the system to be calibrated periodically.

Abstract: A method for protecting the stator windings of a dynamoelectric machine from metal fragments during machining operations that are performed on a housing portion of the dynamoelectric machine during its initial manufacture. The method is characterized by providing removable shields that are selectively positioned over the stator windings to isolate them from the areas of the housing being machined during the machining operation. The shields are effective to prevent any metal shavings, chips or other fragments developed during the machining operation from entering or otherwise contacting the stator windings. After the machining operations are completed, the shields are removed from their respective positions over the stator windings and further fabrication of the machine is then undertaken.

Abstract: An overspeed switching mechanism for a motor has an electrically conductive rotor driven by the motor, a movable drag mechanism having a permanent magnet structure linked magnetically with the rotor for movement of the mechanism through electromagnetic interaction between the magnet structure and the rotor, a latching mechanism linked with the drag mechanism by means of another permanent magnet structure for restraining movement of the drag mechanism until the rotor attains a preset speed at which the latching mechanism releases the drag mechanism and allows limited movement thereof, a switch, and an actuator operatively linked with the drag mechanism and the switch for translating movement of the drag mechanism into switching of the switch.

Abstract: An apparatus and method for precision overboring a variable diameter existing bore through a metal shaft supported in a position that causes the shaft to sag along its longitudinal axis. A plurality of precision-formed tool pilots are selectively mounted ahead of a spade bit on a rotary boring tool to maintain the path of the bit through the shaft-workpiece within a predetermined tolerance of the path followed by an existing bore. A plurality of fluted follower bearings are positioned around the tool driving shaft to minimize its vibration as the bit proceeds through the workpiece. Liquid coolant is passed at high volume into engagement with the bit and thence through the follower bearing exhaust passageways to flush metal shavings and chips from the overbore. According to the method of the invention, tool vibration is carefully monitored as the bit is forced into the workpiece.

Abstract: A wet chlorine generator for providing precisely controlled rates of gas flow for instrumentation purposes, characterized by a safe and reliable gas source provided by precisely controllable electrolysis of a metal chloride electrolyte to form chlorine gas that is then passed through a flow regulating device into a gas conduit that guides the gas from the generator to associated instrumentation.

Abstract: An instrument having an indicating scale and a pointer movable in relation thereto is provided with a pointer clamping mechanism having a bistable retainer that cooperates with a manually operable actuating member to selectively retain the clamping member in either its pointer-clamping position or in a stored position after it is moved to one of such positions by the actuating member. Positive movement of the clamping member between its two positions is achieved by a connector fastened directly to the clamping member and coupled to the actuating member in a manner that causes the connector to be resiliently loaded when the clamping member is moved away from its stored position.

Abstract: A tieless bracing arrangement is provided for rigidly supporting the winding end turns of a dynamoelectric machine in relatively rigid operating position. The bracing arrangement is characterized by including an expandable annulus having a spreader that is operable in conjunction with a plurality of slidably mounted dowels to selectively hold the annulus open while it is positioned adjacent to the machine end turns and then to compress the annulus tightly against the end turns to secure them in operating position.

Abstract: A system for measuring, storing, and analyzing excavator parameters in order to classify excavator activity. A rotary position sensor is coupled to the drag drum, the hoist drum, and the center pindle of an excavator in order to generate analog signals that are a function of the drag cable length, the hoist cable length, and the swing angle, respectively. Shunts are placed in circuit with the drag motor armature and the hoist motor armature in order to generate signals proportional to the drag motor current and the hoist motor current, respectively. A watts transducer connected to the power input generates a signal that is proportional to the amount of power being consumed by the excavator. A control panel is provided whereby an operator can set in the month, day, and the shift, and codes identifying the excavator, the operator and any delay or special activities. The six excavator signals are converted into digital form and recorded along with time and the control panel data on a magnetic tape.

Abstract: A probe assembly for use with an electrical voltmeter-ammeter, to adapt the meter to read electrical resistance, is provided with a pair of probe electrodes connected respectively to separate, flexible, insulated electrical conductors that are coupled to a common multi-terminal plug housing. Terminals mounted in the plug housing are arranged to cooperate with a plurality of terminals mounted on a terminal board in a meter. The probe assembly is further characterized by incorporating a fuse and a battery electrically connected in series with one of the probe electrodes and the terminal to which it is connected by a flexible conductor. A potentiometer is connected in series with one of the flexible conductors while a resistor connected between the flexible conductors to enable a meter to be adjusted for full scale deflection when it is connected to the probe assembly while the probe electrodes are in engagement with one another.

Abstract: An apparatus for making a copper-aluminum transition joint characterized by utilizing a combination die and metal shears mounted between a pair of abrading brushes and wire feeding devices that are operable, respectively, to feed a copper wire and an aluminum wire into overlapping relationship between relatively movable die surfaces, after the wires have been abraded to remove oxidized portions thereof and to remove contaminants from the wires. The respective wire feeding devices cooperate with limit stops formed in the relatively movable dies to assure rapid, accurate positioning of the two wires over a punch in a double-action die that operates to form a cold welded transition joint between the wires when the dies are closed. The wire feed devices also selectively retract the sheared ends of the wires from the transition joint to facilitate rapid ejection of the joint from the die.

Abstract: A method for manufacturing a gas sensor assembly characterized by including the use of a unitized annular sub-assembly having a plurality of separable terminal portions on it. Pursuant to the invention the terminal portions are pre-formed with holding apertures and electrically and mechanically joined, respectively, to the ends of a plurality of wires that are effective to support and heat elements of the sensor. The heater and support wires are then positioned within a ceramic housing to dispose each of the pre-formed terminals within indexing recesses formed in the housing walls. After the terminals are thus positioned they are individually clamped to the housing, then the annular portion of the terminal sub-assembly is separated from the terminals.

Abstract: Metering kWh in an electrical system is accomplished by generating pairs of analog signals, representing current and voltage variables. Each pair of analog signals is multiplied together in a direct pulse-width conversion in a time-division multiplier network. A constant amplitude triangular generator is associated with the multiplier and the multiplier is implemented using C-MOS technology. A separate direct pulse-width multiplier network is provided for multiplying without introducing any phase shift each of the pairs of analog signals to form a series of width and amplitude-modulated pulse signals. The series of modulated pulse signals is converted in, for example, a low-pass filter to a signal having an amplitude representative of average power. For polyphase systems, the signals delivered from each of the multiplier channels are summed at the low-pass filter.