Abstract: A slidable splice plate assembly for physically and electrically connecting the horizontal bus bars of adjacent sections of control centers. The electrically connecting splice bars and the insulating splice slide plate are preassembled and connected to a single horizontal bus within a control center section bar for shipment. After two adjacent sections of control center have been placed side by side, the splice plate assembly of the first control center section is moved over to overlap and be physically connected to the horizontal bus bar of the adjacent control center section.

Abstract: An assembly for joining together end to end sections of cable tray. Each section of cable tray comprises two parallel channel siderails connected by rungs. An L-shaped splice plate has holes in the flat portion to mate with holes in the middle portion of the siderails. The splice plate has a bottom flange with studs that are inserted into respective holes on the bottom portion of the cable tray siderails.

Abstract: An electronic circuit breaker having a trip solenoid assembly. The trip solenoid assembly includes a permanent magnet, plunger, trip coil and assist coil and is positioned adjacent to a phase conductor. At high current levels the phase conductor generates a flux that may cause the circuit breaker to nuisance trip. An assist coil is wound adjacent the trip coil. The assist coil is energized only when the current through the circuit breaker is of such a level so as to cause nuisance tripping. The assist coil is not energized during that time period when the trip coil is energized.

Abstract: An electrostatic fork shield for a layer wound transformer yielding a high degree of noise attenuation. A three phase transformer has three leg portions which are interconnected at both ends by a yoke. Around each leg portion is wound layers of primary coil and secondary coil. The transformer core, coils and shields lie within an enclosure. Both the inner wall and outer wall of each transformer coil is covered with a non-ferrous conductive shield. Between the primary and secondary coils of each phase and their respective vertical shields, is interposed a glastic spacer. A horizontal shield lies across each end of the transformer coil. The horizontal shield comprises a base and inner and outer fingers which cover a large portion of the surface of the coil ends but do not form a complete electric path around any leg portion. Two barrier shields are located on one side of the transformer between adjacent phases and are connected to the inner fingers of each horizontal shield.

Abstract: A length of flexible packaging is provided for use with a sterile enclosure or isolator. The packaging is attached to a port on the outside of the sterile isolator and is adapted to enable an item to be passed from the interior of the sterile isolator through the port into the interior of the packaging. A transverse seal is made in the packaging to seal the dangerous chemical in a segment of the packaging. The packaging is cut transversely along the sealed section and the segment containing the item is separated from the packaging.

Abstract: A system for detecting ground faults in circuit breakers having electronic trip units tied together by a low impedance common or circuit ground conductor. A complete electrical path between two circuit breakers is created when the secondary winding of the instrument current transformer of each circuit breaker is grounded as required by National Electrical Code rules. This can cause the ground fault sensing apparatus to inaccurately reflect the ground fault levels of the circuit breakers. The summing transformer of this invention includes a first primary winding which sums the currents through each of the phase current transformers and a second primary winding which indicates the current through the neutral conductor. The second primary is grounded, the ground does not provide a return path for the current between the two breakers since the second primary is isolated from the other summing transformer windings which are electrically connected to the circuit breaker.

Abstract: An apparatus for severing a web of film in a form, fill and seal packaging machine. The apparatus includes a removable knife and a holder for removably receiving the knife. The holder includes a channel having a pivot pin and a reduced cross-sectional portion. The knife includes a notch for pivoting on the pivot pin.

Abstract: An electrical circuit to signal a circuit breaker to trip when the circuit breaker is closed and a high level fault occurs or when a low level fault occurs while the breaker is in the process of closing. A mechanical switch tied to the breaker contacts deactivates the low level trip function when the contacts are closed. A high level overcurrent causes a trigger diode to conduct current, energizing an opto-coupler that causes the trip solenoid to trip the breaker. The circuit also causes the breaker to trip if a sustained medium level overcurrent exists.

Abstract: A mechanical time delay mechanism is shown which provides a predetermined time delay between the movement of the moving contact blade on a circuit breaker and the activation of a switch. The control circuit design of the circuit breaker provides for tripping at one level when the breaker is in the closed position and at a second lower fault level when the circuit breaker is closing and for a predetermined number of cycles thereafter. The subject time delay mechanism activates a switch to change the tripping level from the second level to the first level at the appropriate time. The mechanism includes a pivot link assembly connected directly to the moving contact arm, a ratchet assembly, and a pivot link connecting the two. The pivot link assembly includes a set of springs to delay the movement of the link with respect to the movement of the pivot link in response to an opposing pull on the link.

Abstract: A time delay undervoltage release for an electric circuit breaker causes the circuit breaker to trip when the control voltage drops below an acceptable level and prevents the breaker from being closed until the control voltage rises to a predetermined level. When the control voltage drops below an acceptable level, the undervoltage release energizes a trip solenoid to trip the breaker. A variable delay is interposed between the control voltage dropping below the acceptable level and the trip solenoid being energized. At the same time the trip solenoid is energized, an inhibit solenoid is deenergized to block the operation of the push-to-close button. When the control voltage increases to a predetermined level, the inhibit solenoid is energized, allowing the push-to-close button to be manually operated and the breaker returned to service.

Abstract: An electric circuit breaker capable of being opened and closed from a remote location. The circuit breaker includes a stationary contact, a movable contact mounted on a carrier and a trip mechanism that trips the circuit breaker, moving the carrier to an open position upon the occurrence of an overcurrent. The remote control assembly opens and closes the circuit breaker independently of the trip mechanism. Upon receiving a signal from a timer switch, a motor operates, rotating a gear spring connected to the motor shaft. An actuator has a tooth positioned between the wire layers of the gear spring. As the gear spring rotates, the tooth moves toward the motor, pivoting the actuator. An operating rod, connected to both the actuator and the carrier, pulls the carrier to open the contacts as the actuator rotates. When the contacts reach the open position, the actuator hits a switch to shut off the motor.

Abstract: An improvement to prevent alteration of the circuit breaker calibration due to high overloads. A circuit breaker has a U-shaped current path with a brazed junction at the bend of the "U". Upon the occurrence of a large overload, the opposing current in the two legs of the U-shaped path will force the two legs of the "U" apart, possibly weakening the brazed junction. When one of the legs is a closely calibrated component of a trip assembly, the breaker will no longer operate within the proper range. A stop is placed within the housing to prevent the two legs from moving apart such a distance as will cause the brazed junction to fail.

Abstract: A method for assembling a floral arrangement is shown. An individual may choose from a number of bases, each resulting in a different floral arrangement design. Each base has a predetermined pattern of holes for insertion of flower stems which the individual chooses to produce a design having the desired details. Each hole is coded to be matched with a flower of a corresponding code. A group of flowers identified by the same code will have the same approximate size and shape, but may vary in color, material or type of flower to allow the individual to choose the arrangement details of the basic design.

Abstract: Arc suppressor plates in a high amperage molded case circuit breaker are arranged in an arc corresponding to blade travel and define passageways having larger exits aligned with respective vents defined by a molded insulator engaged in the wall of the circuit breaker base.

Abstract: A desensitizing circuit for the electronic fault sensing system of high amperage molded case circuit breaker to prevent a ground fault signal from tripping the breaker in the event of current transformer saturation or the response of a downstream breaker to the ground fault signal.

Abstract: A watertight bushing and bolt mounting assembly includes a collar portion around the bushing with a first groove within which is received an upturned flange surrounding an opening in the wall member through which the bushing extends. A resilient first seal member around the flange is pressed against the wall member, the flange or the shoulder formed therebetween to create a watertight seal around the opening when the bushing is clamped to the wall member. A clamp plate secures the bushing to the wall member by means of a watertight bolt mounting assembly which includes a nut with an annular cavity receiving an upturned lip surrounding the bolt bore. A bolt seal member is located around the lip of the bolt bore and is pressed by the nut against the wall member, the lip or the bolt shoulder formed therebetween to create a watertight seal around the bolt bore.