Abstract: A safety switch with detection of the end-stroke of the unlocking mechanism adapted to supervise a safety access of a machine or industrial plant comprises a switching device (2) adapted to be associated to the fixed part of an access to be supervised and having switching means (5) adapted to be operatively connected to one or more control and/or service circuits of the plant for the control thereof, an operating device (3) associated to a movable part of the access to interact with the switching means (5) at the time of opening/closing of the access for opening/closing of one or more circuits, an unlocking mechanism (13) housed in the switching device (2) and having an unlocking pin (14) adapted to translate with maximum predetermined stroke from a blocking position of the access to an unlocked position to determine the opening of the switching means (5), means (17) for the detection of the stroke of the unlocking pin (14) comprising a first detector (18) adapted to detect the start of the stroke of the unlo

Abstract: An interposer block, a chip package assembly test system and method for testing a chip package assembly are described herein. In one example, an interposer block for an integrated circuit chip package test system is provided. The interposer block includes a main body, a retainer plate, and a cover plate. A plurality of spring pins are each disposed in a respective one of a plurality of spring pin receiving holes formed in the main body. The retainer plate is coupled to the main body and captures the spring pins within the plurality of spring pin receiving holes. The cover plate is movably coupled to the main body. The cover plate has a plurality of spring pin clearance holes form therethrough that align with the plurality of spring pin receiving holes formed in the main body.

Abstract: A method of manufacturing an electromagnetic induction device with On-Load Tap Changer. The method includes: a) providing an electromagnetic core with windings, b) suspending an OLTC insulation barrier from the electromagnetic induction device by a suspension, wherein the OLTC interface barrier arrangement is arranged to act as a barrier between an electromagnetic core housing and an OLTC, and wherein the OLTC interface barrier arrangement is provided with a first set of electrical connections arranged to be connected to the windings and a second set of electrical connections arranged to be connected to the OLTC, c) connecting the first set of electrical connections to the windings, and d) subjecting the windings and the OLTC interface barrier arrangement to a drying process.

Abstract: There is described a peripheral module which in addition to the connection terminals for the process data supply has connection terminals for the supply of voltage. Furthermore, the peripheral module has a changeover switching device to disconnect the peripheral module from an upstream load group. The peripheral module can assume the function of a supply group or a power module when a supply voltage is applied to the terminals. In a peripheral system made of several peripheral modules the voltage within a load group is supplied via an internal self-constructing voltage bus.

Abstract: The invention relates to an electrical module, comprising a first electrical interface, said module being attachable to an electrical device for connecting said first electrical interface to said device. The electrical module is characterised by at least one locking device adapted to prevent movement of said module in relation to said electrical device in at least one direction, said locking device comprising a first part which is movable along a first axis and a second part which is turnable about a second axis, the second part being movable to a locking position by turning about said second axis in response to linear movement of the first part along said first axis, said second axis having an extension which is different from the extension of said first axis, and said second part being adapted for engagement with said electrical device in said locking position.

Abstract: A latching electromagnetically actuable device comprises an electromagnet and an electrical coil. The electromagnet comprises an armature and a core. At least one of the armature and the core is of a magnetically hard material. A housing supports the electromagnet and the coil. Energizing the coil in a first direction magnetizes the magnetically hard material to draw the armature and core together and latch the electromagnet. Energizing the coil is a second direction releases the electromagnet.

Abstract: An electronic component includes a laminate having a structure in which an element substrate and a sealing substrate are bonded to each other through an adhesive layer, a terminal electrode is arranged on the element substrate so as to be exposed at an end surface of the laminate, an outside electrode is disposed on the outer surface of the sealing substrate, the terminal electrode and the outside electrode are electrically connected to each other through an end surface electrode disposed on the end surface of the laminate, and the thickness of the end surface electrode is between about one half of the thickness of the adhesive layer and about five times of the thickness thereof.

Abstract: An apparatus and method for monitoring main contacts and auxiliary contacts of a power contactor is disclosed. The apparatus includes four circuits, the first of which has an on state in which a coil of the contactor is energized, and an off state. The first circuit switches from the off state to the on state when a power source is electrically connected to the first circuit if an additional signal is also present, and then remains in the on state until the power source is disconnected. The second circuit prevents the additional signal from being received by the first circuit when the auxiliary contact is in a position indicating that one of the main contacts is welded. The third circuit causes the first circuit to be disconnected from the power source when the fourth circuit provides a signal indicating that one of the auxiliary contacts is welded.

Abstract: A relay multiplexing system which provides improved safety from hazardous voltage conditions. The relay multiplexing system comprises a relay multiplexer module and a terminal block which connects to the relay multiplexer module. The relay multiplexer module and corresponding terminal block incorporate a design according to the present invention whereby power can only be provided to the respective relays when the corresponding terminal block is connected to the respective relay multiplexer module. The terminal block is required to form an electrical path between the power supply in the relay multiplexer module and the relays. Thus, when the terminal block is removed from the corresponding relay multiplexer module, power is unable to be provided to the relays, thereby ensuring safety from hazardous voltages which could otherwise appear on exposed pins of the connector.

Abstract: A safety relay configuration for linking a power source to a device to be powered via at least one output wherein output contacts all have to be closed to provide power to the device, the configuration including first and second three contact relays or four contact relays, each relay including a first NC contact and at least two NO contacts and, wherein the second relay first contact is linked in parallel with the first relay second contact forming a first parallel configuration, the first relay first contact is linked in parallel with the second relay second contact forming a second parallel configuration, the first parallel configuration is linked in series with the first relay coil between the power source and ground, the second parallel configuration is linked in series with the second relay coil between the power source and ground and the relay third contacts are linked within the outputs between the power source and the device.

Abstract: A sequential controller is provided for sequencing multiple electric loads such electric pumps. That is, for each cycle the next load is designated as the lead load in a round-robin fashion. The controller uses cost effective electro-mechanical relay logic an thus avoids conventional solid state technology. In order to sequence the loads on each successive cycle, the electro-mechanical relay connected to the sensors comprises a double-throw contact set. The double-throw contact set comprises two complementary contacts, both of which alternate between normally open and normally closed on each successive cycle. In this manner one each successive cycle, the pumps designated as the lead pump and the lag pump automatically alternate in a round-robin fashion. Further, when the lead pump is disabled the lag pump is immediately actuated without disruption of service.

Abstract: A control cabinet for distributing power to a plurality of automated independent and parallel operated loads. A plurality of control cabinets can be interfaced with control cable to be supervised by one main controller. The main controller distributes low voltage ac signals to each control cabinet, which transfers the low voltage signal into high voltage power distribution by a series of low and high voltage relays, thus eliminating the need for excess circuit boards and transformers normally associated with this task.

Abstract: Improved redundant relay control circuits are set forth which prevent a load from being energized when any relay coil or contact or stop or start switch contact fails. A first circuit embodiment sets forth a plurality of branches with a cross-monitoring interconnection between a start branch and one of the two other circuit branches. The interconnection prevents a load from being energized when a start switch welds. Second and third circuit embodiments are configured such that the redundant control relay circuit remains inoperative until a fault is cleared although the main power across the circuit is temporarily removed. A fourth circuit embodiment operates independent of relay contact timing.

Abstract: A motorcycle has an article storage box equipped with a lid member which is locked and unlocked and with a fuel tank having a gasoline injection port which is closed or opened by a lid member. The locking and unlocking of the lid members of the storage box and the fuel tank injection port are controlled by an electric circuit system. The electric circuit system includes a battery, a main switch unit operatively connected to the battery, a solenoid switch connected to the main switch unit for carrying out an on-off operation to the lid locking and unlocking mechanism for the fuel tank injection port lid, and a solenoid switch connected to the main switch unit for carrying out an on-off operation to the lid locking and unlocking mechanism for the storage box.

Abstract: A self checking interlock modular control system allows for an unlimited number of interlocks to be connected into a single interlock control circuit. The interlock control system provides a method of determining if the components within each interlock module of the control system function correctly when the individual interlocks are opened and closed. The interlock control system has redundant components to provide a circuit path to insure that the interlock control system will open circuit the output if one of the components fails.

Abstract: An improved electrical panel assembly of the type providing a plurality of receptacles for use with cable connectors and requiring that the connectors must be connected with their respective receptacles in a given order and disconnected therefrom in the reverse of that order. The panel assembly comprises a planar panel element having an opening therein for each receptacle and a receptacle mounting housing element behind each panel opening, constituting an integral, one-piece molding. Each panel opening is provided with a cover swingable between a closed position and an open position. The connectors and receptacles are of the known type having single contacts which lock together when the connector is mated with the receptacle and rotated a partial revolution. Polarizing devices are provided in association with each receptacle and each cable connector.

Abstract: A door interlock system and method are disclosed which are suitable for use for permitting electrical energization of power to components within an enclosure (11). If the door is opened, the components are de-energized. The system and method use a supply circuit breaker (5) external of the enclosure (11), and an enclosure circuit breaker (27) within the enclosure. A door sensing circuit (31) comprising an intrinsically safe barrier device senses a door of the enclosure (11) closed by door switch means (33). If the door is opened the door sensing circuit (31) opens a pilot circuit (25) which interrupts pilot circuit current and causes a pilot relay (21) to operate to trip-out the supply circuit breaker (5) thus, de-energizing the enclosure (11).

Abstract: An apparatus for differential-protection of a bus bar having a plurality of terminals which includes a plurality of trunk lines, in which an impedance of a differential circuit connected in parallel to a current transformer provided in each of the terminals is changed depending on either a terminal voltage of this differential circuit, or another terminal voltage derived from a part of the impedances. Then, either a high impedance differential relay, or a low impedance differential relay is selectively available so as to confirmly detect a fault in the bus bar.

Abstract: A wireless power controller for use with a machine device to selectively connect and disconnect a machine device power source from the machine device includes a transmitter for transmitting an energy wave toward a receiving unit located at the machine device. The receiving unit has an electric switching circuit which is wired in series with the machine device power source and the machine device and provides electrical continuity through normally open transfer contacts are connected one-for-one with the voltage lines carrying power between the power source and the machine device and which contacts are closed during normal operation. The receiving unit senses an energy wave and causes the relay to become energized through operation of the switching circuit to disconnect power from the machine device.

Abstract: A bistable electromechanical transducer is disclosed having an armature reciprocable between first and second positions, a permanent magnet latching arrangement for maintaining the armature in the respective positions, and an electromagnetic repulsion arrangement operable when energized to dislodge the armature from the position in which the armature was maintained and causing it to move to the other of the positions. In a preferred embodiment, the transducer takes the form of an electronically controllable valve mechanism for use in an internal combustion engine and has an engine valve with an elongated valve stem along with the electromagnetic repulsion arrangement for causing the valve to move in the direction of stem elongation between valve-open and valve-closed positions.

Abstract: A safety system for an electrical panel assembly providing receptacles for use with cable connectors. The connectors and receptacles are of the known type having single contacts which lock together when the connector is mated with its receptacle and rotated a partial turn. Polarizing devices are provided in association with each receptacle and connector to assure proper mating. The panel assembly is provided with mechanical interlocking devices determining the order in which the connectors are connected to and disconnected from their receptacles to assure that ground makes first and breaks last. The safety system comprises an AC to DC converter/voltage regulator capable of converting 120 volts to 600 volts AC or DC to 12 volts and 115 volts DC. The converter/regulator has a pair of inputs connected to the contacts of any two power receptacles or the contacts of a neutral receptacle and a power receptacle of the panel.

Abstract: An electrical relay control circuit for a plurality of controlled devices such as electric motors in which the current for actuation of the relays is regulated so that only a predetermined and precise amount of current will be available for operation of the relay coils and that current will be sufficient for actuation of only one relay thereby restricting operation to one controlled device at any one time.

Abstract: A relay combination includes a first relay having a first double throw contact set including a first normally closed contact, a first normally open contact and a first armature for contacting the first normally open and closed contacts. A first armature coil manipulates the first armature. A second relay includes a second double throw contact set including a second normally closed contact, a second normally open contact and a second armature for contacting the second normally open and closed contacts. A conductor conducts an alternating current signal to the first and second normally closed contacts. The first and second armatures are electrically coupled to one another through a conductor electrically isolated from the first and second normally closed contacts. A latching circuit is included comprising first and second input circuits for latching the first relay upon receiving a signal on the first input circuit and latching the second relay upon receiving a signal on the input circuit.

Abstract: A road planer machine having a housing containing a rotating planer drum and having access doors in the housing for maintenance and inspection of the cutting equipment which includes detectors for determining when the access doors are not in their normally closed positions and for disabling the propulsion system of the planer machine as well as the drum rotating system so that the machine can neither move nor the drum rotate if any of the access closure doors are not in their normally closed position.

Abstract: Electronically controlled battery electromagnetic cut-out breaking the main ircuit and the auxiliary circuit and being intrinsically safe, characterized in that it includes a driving electromagnet (4) with a plunger core (10) of which the drive shaft (12,14) carries, by means of an insulating intermediate part (16), a central connecting part (17) intended for the breaking of the auxiliary circuit (A,D+), as well as a cross piece (18), driven by means of a spring (19) and itself carrying by means of insulating intermediate parts (22,23) two lateral connecting bars (21), returned by return springs (26), and capable of together being applied, in the energized state of the electromagnet (4), against four terminal locations (27 or 27a) in order to ensure the main single or two-pole break, the whole assembly being enclosed with the electronics (35) in a sealed case (1,33,36).

Abstract: The circuit for controlling the stopping of equipment comprises a switch with two contacts and with a pushbutton able to bring about the switching of the contacts into an open position and a closed position. The circuit comprises a supplementary member which functions like the pushbutton and is controlled by a relay in series with one of the contacts of the switch, this relay being responsive to a remote control device.

Abstract: An irradiation device including a series arrangement of an ultraviolet radiation source (5), a first switch (3) and a second switch (4). Under normal conditions the radiation source (5) is switched on and off by the first switch (3). The second switch (4) is operative only if the first switch (3) fails. By means of a simple circuit (7, 20, 17, 6; R), the defective device cannot be switched on again.

Abstract: A demand controller uses a sensor to detect the operation of an electric load. The sensor operates a relay which supplies power to a magnetic contactor. The magnetic contactor controls power available to a second electric load so that the total amount of power consumed is held below a predetermined maximum. An auxillary switch operates in conjunction with the magnetic contactor to control power available to other loads. A hierarchy is established so that the most important load always has power available, and loads of lesser importance are controlled.

Abstract: A control system for an automatic damper in a heat generation system. The damper is provided with a spring biasing arrangement to open the damper when the plant is generating heat to permit unobstructed discharge of the products of heat generation. A motor maintains the damper closed when no heat is being generated. Provision is made for disabling the control system permitting the damper to be opened by the spring and the heat generator to function normally when a malfunction occurs in a switch which normally performs in a safety capacity. Included in this arrangement is a fuse in a circuit which opens the circuit when the switch fails as the result of a short circuit or welding of the contacts. The circuit includes means for preventing short circuiting during normal operation.

Abstract: A lockout control system locks out the lag load upon occurrence of a predetermined condition in a dual load system set up in a lead-lag configuration. The lockout control system utilizes a lead-lag memory circuit for insuring that only the lag load is locked out when the lockout condition exists irrespective of which load is lead and which load is lag.

Abstract: Electrically powered apparatus is provided with a remote primary control station from which energization of the apparatus is usually controlled, and a secondary control station, such as a jog control station, which is remote from the primary control station and close to the apparatus, from which energization of the apparatus may also be controlled. A single manual push button start control module may be mounted at either station, so that when the module is at the secondary station there is no start button at the primary station. A holding circuit provides for extended energization of the apparatus when the push button is momentarily depressed at the primary station, and there is a stop button at the primary station; while the secondary station has no holding circuit. The holding circuit is disabled when the module is mounted at the secondary station, so the apparatus cannot be energized by mounting a second identical start control module at the primary station.

Abstract: A safety arrangement for microwave ovens or similar cooking devices, in which a circuit breaking element and a main switch, which is arranged to be open in conjunction with an unlocking operation of a lock for a door, are interposed in a load circuit connecting between an electric source of power and a load. A first door switch is arranged to be closed when the door is opened and is connected to the load circuit in parallel with the load. An auxiliary switch becomes opened upon unlocking of the lock, and is connected in the load circuit on the load side of the first door switch. A second door switch becomes opened with a delayed time interval after closing of the first door switch, by opening of the door, and is connected to the load circuit on the electrical power source side of the first door switch. The door switches become operated by a door arm extending from the door.

Abstract: A safety circuit for a potentially dangerous machine monitored by light and which works in an operating cycle. A safety circuit is described which utilizes a series of relays each of which is switched from an energized to a de-energized condition once during each working cycle of the machine so that each of the relay contact also opens and closes during the working cycle. In this way each relay contact is tested. The relays are so interconnected that if one contact should stick it will interrupt the sequence and will ensure the potentially dangerous machine e.g. a press is rendered inactive. Circuits are given for both hand fed and automatic machines which are monitored by a light barrier or curtain. For the hand fed machine the cycle is initiated by the operator reaching through the light barrier to insert an object into the machine. For an automatically fed machine the test cycle is initiated by a switch automatically activated once per cycle.

Abstract: In a crane system for moving a cargo container, an improved system for maintaining the container in a locked relation against a spreader assembly having a plurality of proximity sensors which initially control the ability of said system to lock the container to said spreader, includes a relay connected so as to be actuated by the initial coupling of power to the locking solenoid, such relay acting to maintain power to the locking solenoid even if one or more of the proximity sensors subsequently changes state. The system further includes another relay operatively connected to restore the system to an operative condition after a loss of power has been experienced, such relay functioning to restore power to the locking or unlocking portion of the system, once power has been reestablished, independent of the state of the proximity sensors.

Abstract: A system for automatically selecting operations in a random sequential manner having at least three electrical channel circuits, each channel circuit including primarily a trigger circuit, a switch circuit and an output circuit. Each trigger circuit includes an electrical conductor component exhibiting a negative resistance characteristic, such as a DIAC, adapted to turn on at a relatively high voltage and turn off at a lower voltage, each trigger circuit including a timer circuit for turning on and off the respective electrical conductor components, but all of the timer circuits having different time constants. The different switch circuits are adapted to be turned on by the signals from the corresponding trigger circuits and are adapted to be turned off by corresponding switch timer circuits, also preferably having time constants with different values.

Abstract: Improved door activating motor control apparatus employs a self latching safety edge relay which is selectively energized by any of "open", one-button universal or obstruction-sensing safety edge contacts. A motor controlling contactor switch has its "open" direction coil and contact portion operated by safety edge relay contacts, and its "close" relay portion operated under control of a "close" or the one-button switch.The composite control apparatus of the instant invention exhibits significant operational advantages over prior art structures including, inter alia, frequency exercise of safety edge relay contacts, responsiveness to the "open" switch in an emergency situation, and retention of an obstruction sensing signal to cause door opening.

Abstract: A control in which an active member is momentarily actuated by a moving member only when both members move toward each other and pass each other, the active member being actuated by the moving member as it passes said active member from one direction only, when said members meet and pass in the opposite direction said active member will not be activated, the movement of either member being limited so that the two members can pass each other only when both members move towards each other along parallel paths.