Abstract: Apparatus and methods for deployment of fixtures. The apparatus may include a system for controlling deployed fixtures. The system may receive user commands different devices in different formats. The fixtures may be independently addressable. The fixtures may be magnetically supported by a fixture support. A brace may join two or more fixture supports without reducing space available to support fixtures. The brace may join a fixture support to a fixture support accessory. An accessory may include a variable-angle junction. The fixture may include articulating joints for controlling the direction of a beam. The fixture may include a lens having an electrically controllable beam spread angle. The fixture may be stowable in the fixture support. The fixture may be slidable along a cord to adjust a height of the fixture. The fixture may include an extendable ring. The system may coordinate motions of the fixtures to follow a target. The fixture may include an elongated board.

Abstract: Apparatus and methods for deployment of fixtures. The apparatus may include a system for controlling deployed fixtures. The system may receive user commands different devices in different formats. The fixtures may be independently addressable. The fixtures may be magnetically supported by a fixture support. A brace may join two or more fixture supports without reducing space available to support fixtures. The brace may join a fixture support to a fixture support accessory. An accessory may include a variable-angle junction. The fixture may include articulating joints for controlling the direction of a beam. The fixture may include a lens having an electrically controllable beam spread angle. The fixture may be stowable in the fixture support. The fixture may be slidable along a cord to adjust a height of the fixture. The fixture may include an extendable ring. The system may coordinate motions of the fixtures to follow a target. The fixture may include an elongated board.

Abstract: The application is directed to various connector and sensor assemblies. In some embodiments, the connector and sensor assembly comprises a connector and a sensor assembly. The connector can have an opening that has a first surface and second surface that are opposite each other. The connector can have a plurality of retractable electrical connectors that extend from the first surface and a lock structure that is located on the second surface. The sensor assembly is comprised of a body portion and a proximal end. The proximal end has a top side and a bottom side. The top side includes a plurality of electrical contacts that is configured to interact with the plurality of retractable electrical connectors. The bottom side includes a key structure that is configured to interact with the lock structure in the connector.

Abstract: A lighting assembly connector is configured for being inserted into a lighting track. The lighting assembly connector includes a casing having a width defining a lateral direction and a length defining longitudinal direction. The length is greater than or equal to the width. The casing is definable as including three sections each defining one-third of the length. The three sections include a middle section, a first end section including a first longitudinal end of the casing and a second end section including a second longitudinal end of the casing. The middle section has a greater average width than each of the first end section and the second end section. The lighting assembly connector also includes a plurality of electrical contacts extending out of the casing each configured for contacting a respective line of the lighting track; and at least one fastener connected to the casing configured for removably connecting the lighting assembly connector to the lighting track.

Abstract: A support assembly includes a support member and a track assembly. The support member may include a conductor and/or a pin. The track assembly may include a bus bar. The conductor may be configured to rotate with and/or about the pin to selectively engage the bus bar. The conductor may be configured to rotate about a vertical axis to selectively engage the bus bar. The conductor may be substantially curved and/or substantially planar. The conductor may include a first position and/or a second position. The conductor may not be in electrical contact with the bus bar when in the first position and/or the conductor may be in electrical contact with the bus bar when in the second position. When the conductor is in the first position, the conductor may not restrict removal of the support member from the track assembly.

Abstract: A section of a busbar trunking system, referred to herein as “a BTS section”, comprising: a plurality of conducting bars; and a female electrical connector at a first end of the BTS section; wherein the female electrical connector is arranged to receive a male electrical connector of an adjacent BTS section to electrically connect the conducting bars of the BTS section to conducting bars of the adjacent BTS section as part of a plug-and-play connection.

Abstract: A housing structure has an upper section, a lower section, and an intermediate wall. The intermediate wall has a wire aperture. The upper section has a top wall with contactor slots. An upper compartment is enclosed vertically between the top wall and the intermediate wall. The lower section has a bottom wall with a wire aperture. A lower compartment is enclosed vertically between the bottom wall and the intermediate wall. An electrical contactor has a blade portion projecting outward from the upper compartment through a contactor slot for electrical contact with a busbar in a strut. A wire has an uninsulated section that is contained entirely within the upper compartment, and is electrically connected to the contactor within the upper compartment. An insulated section of the wire reaches outward from the upper compartment into the lower compartment through the wire aperture in the intermediate wall.

Abstract: A product display shelf, system and method are disclosed. The product display system includes a shelf unit having a back shelf portion and a front shelf portion. The back shelf portion includes a first connecting element for releasably attaching the back shelf portion to an electrically powered support member, and the front shelf portion includes a second connecting element for releasably attaching the front shelf portion to the back shelf portion. The front shelf portion can also include a body portion and a display panel connected to or integral with the body portion, suitable for displaying information to a user.

Abstract: A busway assembly includes first and second busway sections and a joint assembly connecting the first and second sections. Each busway section includes a housing including first and second opposing side portions. Each busway section includes a first insulator held in the first side portion and a second insulator held in the second side portion. The first and second insulators each hold one or more bus bar conductors. The joint assembly includes first and second connected joint housings and plurality of joint conductors held in the first and second housings. A first exposed portion of each joint conductor extends out of the first housing and is electrically connected with one of the bus bar conductors of the first busway section. A second exposed portion of each joint conductor extends out of the second housing and is electrically connected with one of the bus bar conductors of the second busway section.

Abstract: An apparatus for mounting a photovoltaic module is disclosed. The apparatus includes a clamp assembly, where the clamp assembly includes a clamp and a fastener engageable with the clamp. The clamp includes a sharp portion.

Abstract: A modular equipment mount to enable quick relocation of the piece of equipment. The piece of equipment is secured to a mount. A track system is secured to multiple locations where the piece of equipment may be secured. Power and data connections are included with the track system to provide power and data to the piece of equipment through connectors on the mount.

Abstract: Bus bars each having a terminal portion formed on one end thereof is spaced from each other and arranged in parallel within a housing. Each terminal portion is formed with a pair of first right and left contact spring pieces each having a bulge protruded horizontally outward at a side of leading portions abutted against each other. The bulges of the two adjacent inside pieces among the first right and left contact spring pieces elastically contact with a pair of light emitting element contact portions disposed on both lateral surfaces of a semiconductor light emitting element arranged between the pair of bus bars and the respective bulges of the two outside pieces among the first right and left contact spring pieces elastically contact with inner walls of the housing.

Abstract: A modular equipment mount to enable quick relocation of the piece of equipment. The piece of equipment is secured to a mount. A track system is secured to multiple locations where the piece of equipment may be secured. Power and data connections are included with the track system to provide power and data to the piece of equipment through connectors on the mount.

Abstract: A latching arrangement for detachably mounting a device on a DIN rail. A support member configured to be mounted on the DIN rail. A guiding slot configured on a same side of the device on which the support member is configured. An engaging lug received in the guiding slot and adapted to move between an engaging, extended configuration and a retracted, disengaging configuration. An urging element cooperating with the engaging lug and the device, the urging element adapted to be configured between a first operative configuration in which the urging element urges the engagement lug towards the support member and a second operative configuration in which said urging element is moved to facilitate moving of the engaging lug away from said support member.

Abstract: An electrical connector system includes a plurality of electrical connectors that can be mounted onto a powered rail. Each of the electrical connectors includes a connector housing that retains an electrical contact. The powered rail includes a tapered alignment guide that receives a complementary tapered arm of the connector housing that locates into the alignment guide so as to position the connectors to the rail.

Abstract: A wireless networking device adapter for provisioning a wireless network using new or existing track lighting. The adapter securely engages the track light channel and supports a commercially available wireless access point (WAP) device. A lock mechanism on the adapter prevents unexpected disengagement of the adapter from the track light channel, yet allows for operator removal. A power converter within the adapter powers the WAP device from the electrical power provided by the track light channel. Multiple adapters communicate to form a mesh network to improve wireless network fault tolerance, or may operate in a repeater mode configuration or some combination.

Abstract: A network component includes an electrical device (10) for exchanging signals via a communication line (1) of a network. The electrical device (10) is configured to be connected electrically to wires (3) of the communication line (1) and includes pins (20), which are configured to pierce the insulation material (2) enclosing the wires (3) of the communication line (1).

Abstract: A connector, an electrified grid element and the combination. First and second contacts with first and second contact portions are secured in the housing of the connector. The second contact portion is offset from a first surface of the connector a greater distance that the first contact portion. An electrified grid has a first conductor and a second conductor, with the first conductor having an opposite polarity to the second conductor. A first insulator member is positioned proximate the first conductor and a second insulator member is positioned proximate the second conductor. The first and second insulator members prevent the mating of the connector to the electrified grid unless the connector is properly oriented in the electrified grid, thereby insuring proper polarity between the connector and the electrified grid.

Abstract: A connector, an electrified grid element and the combination. First and second contacts with first and second contact portions are secured in the housing of the connector. The second contact portion is offset from a first surface of the connector a greater distance that the first contact portion. An electrified grid has a first conductor and a second conductor, with the first conductor having an opposite polarity to the second conductor. A first insulator member is positioned proximate the first conductor and a second insulator member is positioned proximate the second conductor. The first and second insulator members prevent the mating of the connector to the electrified grid unless the connector is properly oriented in the electrified grid, thereby insuring proper polarity between the connector and the electrified grid.

Abstract: An electrical terminal component having an insulating material housing, a busbar installed in the insulating material housing and at least one clamping spring, which springs are arranged on the busbar so as to form clamping points for electrical conductors, is described.

Abstract: A power supply system for the internal power supply of a supporting mast of a wind power installation is provided in order to assist the work of servicing personnel in the wind power installation. The power supply system includes a power bus line, at least one tap on the power bus line for tapping off an electrical potential, and an electrical appliance connected to the tap. The electrical appliance is both electrically connected and mechanically adapted to the tap. An electrical plug connector is also provided.

Abstract: A network component includes an electrical device (10) for exchanging signals via a communication line (1) of a network. The electrical device (10) is configured to be connected electrically to wires (3) of the communication line (1) and includes pins (20), which are configured to pierce the insulation material (2) enclosing the wires (3) of the communication line (1).

Abstract: An electrical connector system includes a plurality of electrical connectors that can be mounted onto a powered rail. Each of the electrical connectors includes a connector housing that retains an electrical contact. The powered rail includes a tapered alignment guide that receives a complementary tapered arm of the connector housing that locates into the alignment guide so as to position the connectors to the rail.

Abstract: A spring terminal element (1) is described, with a busbar piece (2), a tensioning bracket (3), which is mounted on the busbar piece (2) such that it can move relative to the busbar piece (2) and has at least one clamping edge (5a, 5b), which engages under the busbar piece (2), for clamping an electrical conductor between the clamping edge (5a, 5b) and the busbar piece (2), and a helical spring (8), which is operatively connected to the busbar piece (2) and to the tensioning bracket (3) and exerts a spring force between the tensioning bracket (3) and the busbar piece (2). An operating cylinder (10, 19) with a screw thread is mounted such that it can rotate and fixed in position in the extent direction of the operating cylinder (10, 19) on the tensioning bracket (3) or on the busbar piece (2). The operating cylinder (10, 19) is arranged with its screw thread (11) essentially in the internal area of the tensioning bracket (3), at least in the clamping state when it is clamped on an electrical conductor (L).

Abstract: An adjustable connector system for use in an appliance is provided, wherein the adjustable connector system includes a channel disposed on a surface of the appliance, an access aperture defined by a surface adjacent the channel, and a utility enabled connector at least partially received in the channel, and extending from the access aperture, wherein the utility enabled connector includes an elongated member configured to at least partially extend along the channel, and extend from the access aperture, and an interface adapted to supply at least one utility to a modular appliance configured to be removably attached to one of a plurality of removable attachment locations on the appliance.

Abstract: A power supply system for the internal power supply of a supporting mast of a wind power installation is provided in order to assist the work of servicing personnel in a wind power installation. The power supply system includes a power bus line, at least one tap on the power bus line for tapping off an electrical potential, and an electrical appliance connected to the tap. The electrical appliance is both electrically connected and mechanically adapted to the tap. An electrical plug connector is also provided.

Abstract: A demountable pellet is disclosed for use as an electrode contact assembly. The pellet comprises a base 1 upon which is mounted a plurality of electrodes 18, 19, 20 arranged in respective spaced parallel planes and having respective contacts 23, 24, 25 protruding from them. A closure 2 for the base 1 has a member 11, 12, 13 engaging at least one of the electrode contacts. In an unassembled condition of the pellet, with the closure 2 separate from the base 1 and each closure member disengaged from its respective electrode contact, the contacts 23, 24, 25 lie in respective spaced parallel planes. In the assembled condition of the pellet with each closure member engaging its respective electrode contact, at least one of the contacts 23, 24, 25 lies in a plane other than that in which it lay in the unassembled condition of the pellet.

Abstract: An adapter for an electrical line voltage track system includes a housing having a first end adapted for mounting to an electrical source or an electrical fixture, and a second end adapted for mounting to a line voltage track. The housing includes a housing cover coupled to a housing body. The housing cover is movable relative to the housing body between a closed position and an open position. A supporting sleeve is movably coupled to the housing, and a plurality of electrical contacts, including a fixed contact and a movable contact, are also coupled to the housing. The movable contact is movable, relative to the housing, between an engaged position and a disengaged position. In the engaged position, the movable contact causes electrical contact with the line voltage track. In the disengaged position, electrical contact is removed.

Abstract: An adapter for an electrical line voltage track system includes a housing having a first end adapted for mounting to an electrical source or an electrical fixture, and a second end adapted for mounting to a line voltage track. The housing includes a housing cover coupled to a housing body. The housing cover is movable relative to the housing body between a closed position and an open position. A supporting sleeve is movably coupled to the housing, and a plurality of electrical contacts, including a fixed contact and a movable contact, are also coupled to the housing. The movable contact is movable, relative to the housing, between an engaged position and a disengaged position. In the engaged position, the movable contact causes electrical contact with the line voltage track. In the disengaged position, electrical contact is removed.

Abstract: A connection or device adapter, which can be placed on a mounting unit at right angles with respect to a longitudinal direction of busbars and mechanically connected, one contact element being electrically conductively connected to the facing busbar in a connection or device adapter per busbar and the contact elements in the connection or device adapter being led up to connection receptacles in the region of a narrow side of the connection or device adapter. If the contact elements are formed as contact bars and are electrically conductively connected to one another by the associated connection receptacles and form connection units and for the connection or device adapter to have receptacles for the connection units in the region of a narrow side and to accommodate the contact elements with contact points positioned in relation to the busbars, the complexity in terms of parts and assembly, in particular for the connection or device adapter, is substantially reduced and simplified.

Abstract: A data and power distribution system for an electrical busway is provided. The system has a base plate and a data channel located adjacent to or proximate to the base plate. The data channel is structured to receive a number of data transport devices therein. An electrical busway is coupled to the base plate and a power channel is located adjacent to or proximate to the base plate. The power channel is structured to receive the electrical busway therein. The data channel is located proximate to the power channel and the base plate is a unitary component. The base plate may have a number of locations on the base plate that are structured to receive fasteners in order to directly attach the base plate to a mounting surface.

Abstract: A device or connection adapter having a base part, in which contact-making units with connection contacts are accommodated for making electrical contact with busbars of a busbar system, and having a holding apparatus for detachably fixing the device adapter with respect to the busbar system. Given a simple design and simple operation, variable coupling options are provided if the holding apparatus has different, modular connections and clamping feet, at least some of which can be fitted detachably to the base part, in order to mechanically fix the device adapter either to a supporting apparatus of the busbar system or directly to at least one busbar.

Abstract: A track adapter and a track light kit equipped with the same are is described. The track adapter is used for a track assembly and has an insulation tube, a resilient member, a press-in member, a mounting member, a conductive tube having a secure structure, and a connection assembly with a first electrode assembly and a second electrode assembly. The conductive tube and the first electrode assembly combine into a first electrical path; the press-in member, the resilient member, the mounting member and the second electrode assembly combine into a second electrical path. The track adapter can be mounted onto the track assembly easily due to the rotation of the secure structure of the conductive tube.

Abstract: A projector light device includes two or more conductor bars received in a track, a pedestal slidably engaged in the track, two or more conductors secured in the pedestal and each having a flap engageable into the track for electrically contacting with the conductor bars. A projector light member is attached to the pedestal and electrically coupled to the conductors. An actuator device is rotatably received in the pedestal and has an actuator for forcing the flaps of the conductors to engage with the conductor bars when the actuator device is rotated relative to the pedestal.

Abstract: A method and apparatus for manually installing a surface mount connector having at least one ground bar on printed circuit board (PCB). The method and apparatus include inserting a ground bar along a length of a channel of an installation tool, where the channel is sized to receive the ground bar such that a portion of the ground bar extends from the channel. Both the ground bar and installation tool are disposed over a particular area of the PCB, and the tool is used to align the ground bar. The exposed portion of the ground bar is then soldered to the PCB, and the tool is used to repeat the method for the remaining unsoldered portions of the ground bar. The connector is then installed over the soldered ground bar.

Abstract: This invention relates to an adjustable light display assembly in which the light is adjustable in a manner of a track light with the support for the light capable of assuming many configurations including wall panels, support stands and multiple light fixtures.

Abstract: An improved electrical bus system maximizes the distance that electrical current must travel between adjacent buses before a short can occur by placing the buses at the top portion of upside down U-shaped channels within the insulator, and connecting the adjacent U-shaped channels at their bottom ends. The buses are exposed at each end of a bus section, with a joint insulator frictionally secured between the bus insulator and housing to provide insulation for these exposed bus ends. Adjacent bus sections are electrically connected using a snap-on connector extending across the adjacent bus sections. If a neutral bus is included, for example, in a three-phase system, the neutral bus is located directly between a pair of live buses. Because the potential between a live bus and a neutral bus is one-half the potential between two live buses, the live buses may be positioned closer to the neutral bus than another live bus.

Abstract: A electrical device can be snapped onto a support rail by a compression spring orthogonal to a length of the rail and arranged in a cylindrical housing. The housing opens to the outside, opposite the edge of the rail, via an opening in a top adapted to axial insertion of the spring during its assembly and includes an elastic wall capable of transversal movement, with the wall having a bearing surface on a rail edge side on which the spring is buttressed or having another similar bearing surface that can be activated after the axial insertion of the spring.

Abstract: A lockable latch and switch actuator assembly for a circuit card includes a spring clip having a slot cooperating with a tab on a latch handle to lock the latch in its closed position. A release portion on the spring clip may be pushed to release the tab from the slot and unlock the latch. The other end of the spring clip is formed with an actuating portion which engages the actuator of a proximity switch mounted to the circuit card when the latch is in its locked position. This actuating portion is spring loaded so that when the latch is released from the locked position, the latch is pushed to an ajar position from which it can be moved to its fully open position.

Abstract: Disclosed are a fitting, a conductor rail and a conductor rail coupling device for supplying current to lighting fixtures via conductors insulatedly arranged in the conductor rail; the fitting comprises a housing formed of a first and a second housing part which are articulately interconnected and are capable of being mounted on the conductor rail, the two housing parts being adapted to be releasably closed about the conductor rail when the housing is mounted on the conductor rail, and electrical contact elements adapted to contact the conductors through openings of the conductor rail when the housing is mounted on the conductor rail, the electrical contact elements being arranged on only the first one of the housing parts, on one side of the conductor rail; in corresponding manner, the conductor rail of oval cross-section has longitudinal grooves on only one longitudinal side in which the conductors are inserted by aid of slit insulating sections and held therein; on the opposite side, a profiled groove is p

Abstract: A rectangular recessed portion is formed on the upper surface of the transceiver of a portable telephone set for receiving a SIM card. A plurality of contacts are disposed on a base plate which is disposed under the rectangular recessed portion and above a printed circuit board of the transceiver without directly contacting the printed circuit board. The rectangular recessed portion has a plurality of slots formed on the bottom thereof. Each of the contacts protrudes from the corresponding slot of the rectangular recessed portion to couple to the electrical contacts of a SIM card, and has an extended end electrically connected to the contacts of the printed circuit. The recessed rectangular recessed portion has an inclined plane for facilitating the loading of the SIM card.

Abstract: A faceplate assembly, for use with an electronic circuit card, comprising a faceplate and a movable plate, each including conductive portions or being made of a conductive material, and in electrical contact with each other. The faceplate is adapted to mount to an electronic circuit card, and has first and second opposite edges. The movable plate has a free edge and is movably coupled to the faceplate to move, by pivoting, sliding or the like, with respect to the faceplate between a retracted position and an extended position. Movement of the movable plate can be effected manually, or automatically by movement of the latches on the electronic circuit card assembly which latch the electronic circuit card assembly into an electronic circuit card housing.

Abstract: A track lighting system which uses a lighting truss which separates the support function from the electrical connection function is provided. A lighting truss is shown which consists of a longitudinally extending base portion having at least an upstanding flange projecting from one side, and an upstanding wall projecting from the other side. A piece of lighting track is mounted on the vertical wall portion, and a beam clamp fastens a luminaire to the longitudinally extending base portion. The upstanding flange will prevent the luminaire from falling off should it loosen in use.

Abstract: A modular furniture system is provided having vertical standards with internal conductors. The conductors are coupled to a source of low voltage electrical power such that adjacent vertical standards are of differing electrical polarity. Brackets for use in the modular furniture system are designed to make electrical contact with the internal conductors when a bracket is engaged in a vertical standard. An electrical device, such as a light fixture, is coupled between a pair of brackets engaged with adjacent vertical standards, thus, energizing the electrical device. Alternative embodiments are provided for use in merchandising displays and office partition systems.

Abstract: A track light mounting arrangement includes a plurality of tracks fastened to locating frames, a plurality of electric boxes slidably coupled to the tracks to hold a respective lamp assembly, a plurality of sliding switches respectively coupled to the electric boxes and moved forward to turn on the respective lamp assemblies or backward to turn them off. Circular distribution boxes may be installed for coupling tracks radially by connecting devices, so that a plurality of track lights can be electrically connected and arranged in all directions.

Abstract: The invention relates to a kit for designing a lighting arrangement, in which light fixtures (8) are clamped in tracks with electric conductors, which are hung from the ceiling. The kit consists of the combination of two track elements (3) which are hung from a ceiling (9) by hanging rods (10) and a low-voltage transformer (12). The track elements (3) each have two recesses (4, 5) disposed one above the other at the same side of track element (3), and two low-voltage electric conductors (6) are arranged in one of the recesses (5) at a distance from and opposite one another, the other recess (4) being used to mount the light fixtures (8) and for connection of the track elements (3) on a track connector (7).

Abstract: An electrical connector 48 for making electrical contact with a conductor track 36 through slots 44 in a channel 26 behind which the conductor track is disposed comprises a pair of tongues 50 which are able to reach through the slots. The tongues each carry conductor pins 114, 116 for establishing electrical contact with the conductor track. The tongues each further carry a jaw 166 which is displaceable in a direction transverse to that in which the tongues are inserted through the slots, between a retracted position in which it is retracted in the tongue and an extended position in which it protrudes laterally from the tongue and engages with the conductor track. Pin wedges 120 displace terminal portions 126 of the conductor pins to make electrical contact with the conductor track.

Abstract: A channel-shaped insulator is received in a channel-shaped metal track. First and second conductive bus bars are mounted in holders within the insulator, which has wall portions disposed between the track and the bus bars and affording spacing therebetween. The track is formed with first and second longitudinal grooves opposite the bus bars and affording additional spacing between the track and the bus bars. First and second longitudinal ridges are formed on the insulator opposite the first and second bus bars and extending into the grooves for engaging the track to maintain the additional spacing. The depth of the grooves preferably corresponds with the thickness of the wall portions of the insulator between the track and the bus bars. The height of the ridges preferably corresponds with the depth of the grooves. The provision of the grooves and the ridges may increase the minimum spacing between the metal track and the bus bars from 1/32 of an inch to 1/16 of an inch.

Abstract: A current collector device intended to be connected to a voltage rail comprising a bottom part (1) with two parallel side walls (2, 3) on whose inner side longitudinally extending ribs (4, 5, 6, 7) are provided, while at least two mutually insulated current conductors (11, 9, 10) are present on the bottom part, this current collector device comprising a housing of synthetic material which is provided with projecting contact members (14, 15) and is shaped so that it can be pressed into the rail, an electrical connection being established between the contact members and the current conductors, while the housing is detachably secured to the side walls of the voltage rail by means of edges (20, 21) cooperating with the ribs (4 and 5) in the rail, the housing accommodating a carriage (13) which carries the contact members and is slidable between a decoupling position, in which the housing can be pressed into the rail, and a coupling position, in which the housing is locked in the rail in the pressed-in state.

Abstract: A low voltage distribution system comprises a two-conductor track of which one conductor is an outer conductor formed by its casing and the other conductor is an inner copper strip held by insulation. An adaptor can be fitted anywhere along the track and interlocked by closing pivoted members so that portions displace resilient arms outwardly to interlock lips of the adaptor with lips of the track. A fully rotatable contact assembly includes a center contact inside a sleeve contact as well as a lamp bracket which rotates as one with the contact assembly so that wires to the lamp never get twisted. For ease of mounting, a fixing device comprises a rotatable member which can be mounted to a support by a center screw and having a slot or opening to receive a connecting piece which is slidably connected to the back of the track casing by undercut tongue and groove.