Abstract: After marker functions have been performed to set up a network path during normal call processing, a continuity word is inserted into the path. The output of the path is coupled back to the input via a test multiplexer at the input to circulate the continuity word. A word is taken from the path being tested after circulation and is compared to the original continuity word, with identity of comparison being verification of continuity. Continuity test apparatus includes a continuity word register and a comparator. The comparator has inputs from the continuity word register and from the network output for the path being tested. The continuity word may be inserted in the path from an output access memory for maintenance and test words, having its output to the same multiplex lead as the output buffer memory.

Abstract: A clutch band having a wide portion and a narrow portion for use in an overrunning band clutch assembly includes at least one projection portion extending outwardly from the band contacting the outer member of the clutch assembly during overrun to prevent premature wearing of the narrow portion of the clutch band in the inner member of the clutch assembly.

Abstract: The underside of the bottom wall of an electric cooker contains a sheathed electric heater element intermittently staked and keyed to the sides and base of a receiving channel to control and confine growth and resist twisting movement of the element therein during heating.

Abstract: The invention provides a folding wing disc harrow wherein a hydraulic operating mechanism is provided for folding and unfolding the wings through an arc of more than 180.degree. through the positive bidirectional linear movement of the plunger of a double acting hydraulic cylinder cooperating with the wing to which it is connected, for said folding and unfolding operations, and which mechanism allows a limited angular free floating motion of the wing above and below the horizontal "unfolded" or "working" position when the hydraulic control valve is set accordingly. The connection of the hydraulic piston rod with the wing is so organized that the straight line motion of the piston rod is enabled to fold and unfold the wing through an arc well in excess of 180.degree. and is organized to allow a limited free floating action of the wing for following the soil surface variations.The ability of the present invention to swing the wing through 180.degree.

Abstract: The present invention is directed to a computer controlled operator training system for providing audio and visual cues for use in the training of telephone operator personnel in the use of toll service desks in an automatic telephone system.

Abstract: The regulator assembly comprises body member carried by a support and defining a cavity for detaining a pool of abrasive slurry. An overflow device is associated with the body member for establishing the upper level of a pool of abrasive slurry in the cavity. At least one flow-restrictive conduit component is secured at one end to the body member, communicates with the cavity at the lower end of the pool of abrasive slurry, and presents an outer end from which abrasive slurry is discharged. One of the above-indicated elements is movable whereby to selectively adjust the vertical distance between the plane of the upper level of the pool of abrasive slurry and the plane of the outer end of the conduit component.

Abstract: A tire building apparatus having main frame means, and rotatable tire building drum means supported by the main frame means. A pair of tire bead placing and end ply bag turn-up ring means are supported on the main frame means and are movable axially inwardly and outwardly longitudinally of the drum means. Positive stop means are carried by the main frame means and are engageable by the ring means for locating the latter in precise predetermined inward bead set positions.

Abstract: A control arrangement for use in an automatic fuel ignition system for providing electronic detection of a leak condition for a pilot valve operable to supply fuel to a pilot outlet for ignition to establish pilot flame includes a flame sensing circuit which effects operation of a main valve when a pilot flame is established, the flame sensing circuit maintaining the main valve deenergized when a pilot flame is established during an ignition interval and permitting a delay device to deenergize the pilot valve for a time to interrupt the supply of fuel to the pilot outlet to attempt to extinguish the pilot flame, and a time out device operable to deactivate the system when the delay device fails to cause the pilot flame to be extinguished, the flame sensing means overriding the delay device and the timeout device when the pilot flame is established at the end of the ignition interval.

Abstract: The regulator assembly comprises body member carried by a support and defining a cavity for detaining a pool of abrasive slurry. An overflow device is associated with the body member for establishing the upper level of a pool of abrasive slurry in the cavity. At least one flow-restrictive conduit component is secured at one end to the body member, communicates with the cavity at the lower end of the pool of abrasive slurry, and presents an outer end from which abrasive slurry is discharged. One of the above-indicated elements is movable whereby to selectively adjust the vertical distance between the plane of the upper level of the pool of abrasive slurry and the plane of the outer end of the conduit component.

Abstract: A surgical instrument tray which may be used for protectively holding surgical instruments during sterilization and storing thereof as well as for so holding the instruments for ready accessibility thereto during an operation, the tray embodying a plurality of compartments which may be programmed as to size and location for holding complete sets of instruments therein in the order of use of the individual instruments during a particular type of surgical procedure, with the compartments embodied in resilient, sterilizable material which is effective to protect the instruments against damage.

Abstract: A gas valve having first and second redundant valve members, disposed in a passageway between an inlet and an outlet of the valve which are individually operable to open and close respective inlet and outlet valve ports, and a pressure regulating apparatus interposed between the inlet and outlet valve ports operable to supply gas to the outlet valve port initially at a pressure lower than the inlet pressure when the first and second valve members are operated to open respective valve ports, and to gradually increase the pressure of the gas supplied to the outlet valve port until the outlet pressure equals a value intermediate the inlet pressure and the initial outlet pressure, as established by a pressure regulator spring of the pressure regulating apparatus. The gas valve is disclosed with reference to an application in a fuel ignition system to regulate gas flow to a combustion box to minimize ignition noise and rollout of gas flame from the combustion box.

Abstract: A sheathed electric heater element is fixed to the wall of a cooker by displacing metal from one side of the cooker wall to form an irregular channel having projecting ribs along its two sides, then placing the sheathed heater element between the two ribs and compressing the portions of the sheathed heater element between the channel base and the inner surfaces of the two ribs as the ribs are folded inwardly thereagainst.

Abstract: The invention provides a tool for closing off the jet nozzles of jet pumps located in an almost inaccessible location inside the shell of a boiling water reactor. The tool suspended on a cord is lowered down through a narrow gap extending down along the major part of the shell of the reactor, a distance of approximately 30 feet. The tool is lowered onto a stationary projection--namely, a lug or ear--which provides a gauge point for height and lateral position and an anchorage for torque in a horizontal plane. With these two controls for the tool of the invention, a closure for the jet nozzle may be applied to each of the jet nozzles to close them off against outflow of the water contained in the shell of the reactor thereby avoiding the bleak alternative of taking the reactor completely out of service, which includes removing the fuel bundles and draining the shell.

Abstract: The supporting transport (or depth gauge) wheels of an agricultural implement are raised and lowered by means of a hydraulic-actuated piston cylinder which pivotally connects to one end of a bell crank lever made rigid with a pivot shaft rotatably journalled to the implement frame and to which shaft the wheel supports are also rigid. The opposite end of the piston cylinder pivotally connects to a cradle which has its near end pivotally connected to the other end of the bell crank lever and its remote end yieldably connected to the implement frame as by a pin and slot connection (or a pivoted link) which accomodates horizontal movement with little or no vertical displacement of said remote end in response to extension and retraction of the piston cylinder.

Abstract: A system for providing remote readout of a plurality of groups of data indicating devices including a control unit for each group of data indicating devices for receiving interrogate data signals transmitted over a communication line or RF signal link from an interrogate unit at a central location to the locations of the control units, and for transmitting the interrogate data to transponders associated with the indicating devices over existing electrical power lines to which the control unit and transponders are connected via existing electrical outlets. The transponders are responsive to the interrogate data to generate reply data representing the reading of an associated indicating device for transmission over the electrical power line to the control unit which effects the transmission of the reply data to the central location.

Abstract: A fail-safe energizing circuit for effecting the operation of a functional device, such as a relay, includes a resistor and a capacitor connected between outputs of an AC signal source which supplies an AC signal for charging the capacitor, a normally disabled silicon controlled rectifier connected in shunt with the capacitor and an operate coil of the relay and operable when enabled to provide a discharge path for the capacitor permitting the capacitor to discharge over the relay coil to operate the relay, and a control circuit operable to provide an enabling signal derived from the AC signal for enabling the silicon controlled rectifier. The energizing circuit is described with reference to an application in an automatic fuel ignition system for controlling the operation of a relay which energizes a fuel valve of the system.

Abstract: A method and control arrangement for a heating system including solar heating apparatus and a conventional fuel-fired heating apparatus wherein heat load of the heating system and solar heating source capability are compared, and the heating system is switched to solar heating whenever the heating capability of the solar heating apparatus exceeds the heat load of the system, the heating system being switched to the conventional heating apparatus only when the heat load exceeds the heating capability of the solar heating apparatus.

Abstract: An automatic fuel ignition system which provides automatic detection of a leak condition for a pilot valve which is operable to supply fuel to a pilot burner for ignition to establish pilot flame and a main valve which is operable to supply fuel to a main burner for ignition by the pilot flame of the system including a control circuit operable in response to a request signal to activate the system tentatively, a delay circuit which delays the operation of the pilot valve for a first delay period after the occurrence of the request signal, a flame sensing circuit which senses the presence of the pilot flame and effects operation of the main valve after a second delay period established by the control circuit, the flame sensing circuit being responsive to the presence of a flame at the pilot burner during the first delay period or at the main burner during the second delay period to cause the system to be deactivated.

Abstract: A grounding jack, particularly useful in a patient load center of hospitals, and the like, is disclosed, wherein the male and female members thereof, when assembled, may be locked together by the non-current-carrying or insulated portions thereof, and the frictional engagement between the surfaces of the current-carrying portions is such that breakage of the locking means or inadvertent unlocking between the two members will not impair current flow.

Abstract: A method and apparatus for conveying parts from a production machinery includes a first normally energized conveyor which conveys the parts from the production machinery to a first location, and discharges the parts into a parts stacking hopper at the first location, which stacks the parts on a second normally deenergized conveyor, and a photooptic control system which deenergizes the first conveyor and energizes the second conveyor when a predetermined number of parts have been stacked on the second conveyor to permit the stack of parts to be conveyed to a second location.