Abstract: A press seal-type lamp is provided in the form of a bulb portion and a press seal extending therefrom. The bulb portion contains at least one filament from which extends a first lead wire and a second lead wire. The first and second lead wires are sealed within and extend from the press seal. A length of each lead wire is folded over the press seal and caused to extend into a respective groove formed in the press seal.

Abstract: The invention relates to an improved structure of a decorative light string, which includes an electrical wire to connect with many bulb assemblies for decorative lighting. The bulb assembly includes a light bulb holder with a dint to receive a LED bulb and a base with a dint to receive the holder together with the LED bulb under a corrective direction. By use of the invention, the light string lights without high heat and prevent from any accident of fire and damage.

Abstract: A lamp base having upper and lower ends and a recess hole being provided on said upper end downward for receiving a lamp bulb which has two lead wires threading through out of the two sides of said lower end; and a lamp socket having upper and lower ends and an inner through hole to receive said lamp base, two power sources wires being inserted into said through hole from said lower end thereof to connect respectively with two contact plates fixed on the inner opposite walls of said through hole for making contact with said lead wires of said lamp bulb, characterized in that said lamp base has an end of a long friction stub connected on the lower end surface thereof, while another end of the friction stub is a free end, and in said through hole of said lamp socket, two inner side walls having no contact plates, form a recess on each said inner wall and these two recesses surrounding a space which has a sectional shape to be tightly fitted with that of said friction stub, when said friction stub plugs into the

Abstract: A wedge-base lamp socket comprises a socket body having a lamp holder for holding a wedge-base lamp. The lamp holder includes an outside wall, a pair of opposite receiving portions disposed inside the outside wall and opposed inside walls diametrically extending between the receiving portions. The inside walls define an elongated channel therebetween for receiving a wedge base of a lamp. The opposed inside walls include a pair of opposed recesses adjacent to each of the receiving portions each including a guide groove therein. A pair of terminals are oppositely mounted in the lamp holder. Each terminal has a bracket part received in a respective one of the receiving portions and a pair of clamp arms connected to the bracket part. The clamp arms extend upwardly along both sides of the bracket part and are adapted for clamping the wedge base of the lamp.

Abstract: A lamp socket unit including an insulating body, several insulating wires, a bottom cover, several copper contact sheets and a lamp bulb. One end of the insulating body has an opening to receive the lamp bulb. Another end of the body is combined with a bottom cover having a wire slot, a copper contact sheet insertion hole and a bottom cover passing hole. The bottom cover has a stay with a reversed hook. One end of copper contact sheet has a taper portion and the another end has a contact portion. The copper contact sheet is arranged and fixed in the insertion hole. The taper portion is fixed in the wire slot, and the contact portion extended to the opening of the body of the lamp bulb. The insulating wire is placed within the wire slot of the body. The taper portion is pierced into the insulating cover of wire and contacted with several copper wires within the wire. The bottom cover presses the wire into the wire slot and the reversed hook fixes the bottom cover on the body.

Abstract: A Christmas lamp socket includes a housing, a lamp base with a lamp fitted therein and inserted in the housing completely. The housing has two aligned grooves in a bottom end for a power wire to be fitted and positioned therein with a proper tenseness so as to enable the sockets kept upright to the wire and thus to prevent rain from flowing in the housing and the lamp base and from consequent short circuit.

Abstract: A bulb socket consisting of an inner piece and a hollow outer piece guidingly receiving the inner piece. The inner piece has a pair of channels for accommodating an electrical connecting wire, a web physically separating the pair of channels and a pair of slits each extending in a respective channel for anchoring a contact blade associated with the electrical connecting wire. The hollow outer piece has a pair of curved recesses complementary in shape to the pair of channels. After the inner and outer pieces are brought together, the pair of channels and the pair of curved recesses form a respective hole formation which securely retain the electrical connecting wires in position, thereby preventing undesired bending of the wires which might lead to short circuit and electrical hazard. The channels and the curved recesses in their modified form are able to accommodate two electrical connecting wires and associated contact blades.

Abstract: An improved plug-in type light bulb including a light bulb with a plug unit and an electrical socket for receiving the light bulb. The socket is comprised of two symmetrical halves each of which includes an upper portion and a lower portion. A cover plate with a notch is disposed inside at the upper portion, while a plurality of grooves are formed at the lower portion. A plurality of electrically conductive plates are disposed in the grooves and each of which has an angular contact terminal. The plug unit has two side walls each of which has an integrally formed raised block and two lateral walls against which the corresponding contact terminals of the lead wires rest. The lateral walls are further provided with a respective half round groove across which the contact terminal is disposed.

Abstract: A socket for receiving a radiation source, such as a luminous source, having a base, the base having at least one groove-shaped depression thereon, the socket having a bottom portion defining a receptacle for receiving the base; a pair of walls extending upwardly from the bottom portion and being spaced apart from each other so as to receive the base therebetween; at least one of the walls having at least one protuberance which projects inwardly of the socket toward the other of the walls; the at least one protuberance being receivable in a corresponding groove-shaped depression in the base so as to guide and retain the base in the socket; the socket and the base being shiftable relative to each other along an axis, wherein the at least one protuberance and the groove-shaped depression extend in a direction substantially parallel to the axis.

Abstract: An improved socket and holder assembly is provided which comprises a socket holder having a cylindrical body which defines a socket receiving space therein. The body further includes a conducting plate seat at the inner wall thereof for receiving a conducting plate. The bottom of the body is provided with an opening for inserting a conducting wires. A socket holder has a cylindrical body which defines a bulb receiving space for receiving a bulb therein. The socket body further includes a first extension and a second extension which extend from the bottom of the socket body. The first extension is provided with a pair of passages which are communicated with the bulb receiving space. The second extension is dimensioned such that the bottom of the second extension can be inserted into the bottom opening of the holder.

Abstract: A vehicular lamp which includes a lamp body and a wedge-base bulb which connects to a lead wire, in which a base member of the wedge-base bulb is held by contact holding pieces of a contact terminal which is securely held by the lamp body and penetrates the lamp body in the front-rear direction thereof, so that the wedge-base bulb is mounted on a front surface of the lamp body, and the lamp is characterized in that the contact terminal is of a box-type and formed integrally with the lamp body.

Abstract: The present invention relates to an improved light bulb socket structure for use in a decorative light bulb series which is provided with a rod on the bottom of the light bulb holder to embrace the electrical wires with the walls of the light bulb socket and to close the opening on the bottom of the socket body in a watertight manner. The inventive socket structure can prevent water or moisture from penetrating into the interior of the socket body and deteriorating the conductor parts of the socket.

Abstract: A waterproof light bulb holder is provided that includes a cap having a light bulb engaged in one end thereof, the cap and bulb being received within a bore formed in one end of a base. A plastic cork having two opened holes for receiving the electrical wires which are inserted into the base with conductors coupled thereto is disposed within a frustro-conically shaped bore found in an opposing end of the base. The plastic cork provides a secure and waterproof engagement with both the base and the wires, to prevent water from infiltrating into the base and resulting in a short circuit.

Abstract: A socket for operatively holding a wedge-base lamp has terminal guards positioned within a lamp receptacle to protect electrical terminals inside the receptacle from damaging contact by a lamp as it is inserted into the receptacle. The guards comprise a pair of terminal covers located between the terminals and the open end of the receptacle, the covers defining a gap which receives a base portion of the lamp and guides it into a proper position with respect to the terminals. The lamp base has a pair of lead wires which make contact with the terminals, and guide notches formed in the gap-defining edges of the guards engage the wires and draw them into contact with the terminals as the lamp base passes through the gap.

Abstract: A Christmas light assembly including a lamp holder, a lamp base press-fit into the lamp holder to hold bulb, and two electrical wires having a respective conductor terminal inserted into a top insertion hole of the lamp holder into contact with the conductor wires of the bulb, wherein the insertion hole of the lamp holder is comprised of two circular wire holes linked in parallel; the lamp base has an upright rod inserted into the insertion hole of the lamp holder to separate the electrical wires and to hold them down, and a peripheral bottom flange raised around the periphery of the bottom open end thereof; the lamp holder has a rim raised around the periphery of the bottom open end thereof and press-fit into engagement with the peripheral bottom flange of the lamp base.

Abstract: A replaceable headlamp lamp bulb may be held in retainer with a projecting tab. The tab may in turn be positioned in a slotted holder having adjacent pivots. The lamp bulb may then be positioned by sliding and pivoting the tab with respect to the slot and pivots until properly located. The tab may then be welded to the adjacent slot wall, thereby accurately and permanently fixing the lamp in three dimensions. The slotted holder may be retained in a less expensive resin, since ultrasonic welding is no longer required.

Abstract: A light bulb socket structure is provided having a waterproof feature. In the socket structure, a resilient skirt of a light bulb holder and an annular flange of a light bulb seat produce a watertight joint, which cooperates with waterproof end cap or plug attached to the lower end of the light bulb seat to provide protection for electrical connection portions of a light bulb installed on the socket against water penetration.

Abstract: The invention relates to an improved structure of a decorative light bulb socket, mainly comprising a light bulb holder having a slot and a vertical gap on its base and two lips beside the gap and a socket having a projection with an inner channel on its side. When a light bulb is fitted in the holder as well as the holder is put into the socket, the gap will be closed and the lips are inserted into the channel of the projection which will achieve a firm connection among the light bulb, the holder, and the socket.

Abstract: An arm formed in the wall of an element receptacle undergoes elastic deformation under the influence of a contact fitting. Accordingly, wider range tolerances in the elements can be accommodated without causing permanent deformation of the contact fitting. As an alternative construction, there is a locking part on the receptacle which does not deform, but instead the contact fitting is displaced as the element is inserted.

Abstract: A decorative bulb contains a bulb casing, a bulblet, a bulblet socket, a casing socket and a cover. The male-threaded end of the bulb casing is screwed with the female threads of an outer sleeve of the casing socket. The bulblet is inserted into the bulblet socket which is inserted into the inner sleeve. A cover has a protruded post and two recess holes. The lower portion of the outer sleeve is covered by the cover.

Abstract: The present invention relates to a light bulb socket structure provided with sealing elements. The sealing elements, combined with conductor plates and electrical conductor wires, are arranged inside the body of the socket in such a way that the lower end of the socket is closed in a watertight manner. The inventive socket can prevent water or moisture from penetrating into the interior of the socket body and deteriorating the conductor parts of the socket.

Abstract: A connector attachment component for a lamp is provided with a bulb holder which includes an electrically insulative base member defining a central interior rectangular space for receiving a lamp base therewithin. A pair of electrically conductive bulb connectors have resilient generally U-shaped clamp elements for resiliently holding the lamp base, and a connection piece for connection to an electrical circuit. The pair of connectors are positioned parallel to one another within the central interior rectangular space such that each of the clamp elements forwardly extends to receive the lamp base of a lamp when inserted thereinto. An electrically conductive reflecting plate forwardly extends from an upper surface of the bulb holder so as to be in covering relationship to the lamp when the lamp base thereof is resiliently held by the clamp elements of the connectors.

Abstract: A bulb socket has a socket main body and a pair of bulb clamping pieces for holding a base of a bulb. The bulb clamping pieces have projection pieces formed by cutting out and raised up so that not only the base of the bulb is clamped by the bulb clamping pieces by resiliency, but also the edges of the clamping pieces bite into and catch leads raised and bent along the base. Alternatively, a first holding portion and a second holding portion are provided in each of clamping pieces to hold a base of the bulb by way of two-point support by the first and second holding portion of each of the clamping pieces. As a result, the bulb holding force is so increased as to reliably prevent the bulb from being detached from the bulb socket even if the bulb is located at a position susceptible to impact.

Abstract: A connector assembly for electrical components includes an electrically insulative base member having a generally square tubular form so as to establish a lengthwise interior space having open forward and rearward ends. The base member has a rearward constricted portion with a lesser widthwise dimension as compared to a forward base portion so as to establish at least one lateral recess rearwardly of the forward base portion of the base member. At least one electrically conductive connector having a pair of opposed forwardly projecting resilient conducting clamps is inserted into the rearward end of, and positioned within, the interior space of the base member so that a connection end of an electrical component may be inserted into the forward end of the interior space and held between the conducting clamps of the connector.

Abstract: An improved connecting mechanism for a bulb holder and a socket includes a latch member which is one part of the bulb holder and a securing seat which is one part of the socket. The latch member includes a boss which extends horizontally from the outer wall of the flange of the tubular body of the bulb holder. A hooking rod extends from the underside of the boss to a preset length. A slightly enlarged bead is provided at the end of the hooking rod. The securing seat includes a projected portion extended from the top of the outer wall of the tubular body of the socket. The projected portion further includes a securing channel for receiving the hooking rod. The inner diameter of the securing channel is slightly smaller than the hooking rod in such a manner that an interference fit is reached therebetween.

Abstract: Miniature lamp holder includes a cylindrical body having a central bore configured to receive a lamp, a pair of connectors located in the body to connect wires of the lamp with an electrical circuit, and a cap snapped into a bottom of the body. The body has a flange with a pair of diametrically disposed recesses in a top side thereof on an outer diameter. A pair of retaining projections extend upwardly from the top side of the flange and are formed axially of the body for engaging the miniature lamp holder in a circuit board aperture. A pair of cut-outs is formed axially of the cylindrical body over the pair of recesses. A pair of rails with a channel at a mid-section thereof extends downwardly from a bottom side of the flange. The connectors have a bent section at an upper end thereof, a "V"-shaped hooked section at a lower end thereof, and a dimple in the hooked section for accommodating the lamp.

Abstract: A vehicle signal lamp assembly includes lamp filaments extending in a direction generally parallel to the line of action of the principal vibratory force imposed on the lamp assembly. The assembly includes a lamp having a base that mounts two or more pairs of relatively stiff filament support wires. The lamp assembly further includes a socket having a cavity mated to the cross sectional configuration of the lamp base, and resilient electrical contact leaf members in the cavity engageable with the filament support wires when the lamp base is plugged into the socket cavity. The socket is carried in a resilient mounting that provides partial shock isolation for the socket and lamp.

Abstract: A connector assembly for lamps such as lamps which are used for automotive signaling lamps includes a single adaptor plug which, at a first end, plugs into a socket fixed to the signal light assembly and at a second end has a socket for receiving a flat sealed end of a bulb. The adaptor plug includes a pair of electrical contacts therein each of which has a female electrical connector at both ends. One end of each female electrical connector receives a blade of a wire lead contact while the other end receives the flattened, sealed end of the bulb and makes contact with one of the bulb terminals. The adaptor includes a lug projecting from a surface thereof which lug is received in a recess in a spring arm latch mounted on the socket. By utilizing the aforedescribed adaptor plug, a simpler, more reliable, less expensive connector assembly for automotive lamps is provided.

Abstract: A plate-like support has a pair of opposite faces and is formed with a throughgoing opening. A synthetic-resin lamp holder having a longitudinally open socket is formed with a foot projecting generally perpendicularly of the socket through the opening and formed with respective longitudinally spaced front and back abutments bearing on one of the faces of the support and respective side retaining formations between the abutments. A plug engaged snugly against the other face of the support between the abutments of the foot is formed with a pair of retaining formations lookingly engageable with the formations of the foot. An electrical wire extends through the plug, through the opening, and between the abutments to the socket.

Abstract: An electric light bulb socket positioner for lamp assemblies is provided. The lamp assembly consists of an electric light bulb sleeve, an electric light bulb stem and an electric light bulb. The light bulb stem, at the lower end of the electric light bulb socket, is provided with a pair of keyway slots formed through opposing wall portions. The slotted openings allow greater dimensional variability in the mating light bulb sleeve.

Abstract: A Christmas lamp socket includes an upper socket for a Christmas lamp to fit therein, and a lower socket for the upper socket to fit therein is provided. The upper socket has a fitting bar extending transversely from an upper edge and is able to be bent so as to be received within a substantially cylindrically shaped opening of a C-shaped projection extending transversely from an upper edge of the lower socket to firmly secure the upper socket to the lower socket.

Abstract: In a process for mounting a single-capped electric lamp (1) in a lampholder (20) of a luminaire (22), use is made of a cap (3) having an end zone (9) in its shell (4) which in a mounted lamp is outside the lampholder. The end zone (9) is provided with relief (15) enabling a mounting tool (30) to seize the cap (3) with little force and nevertheless to have a firm grip onto the lamp. The position of the relief (15) may be related to the position of coupling device (10) present at the cap (3) for cooperation with the lampholder, enabling the tool (30) to approach the holder (20) with the cap (3) in a predetermined position. By the process it is counteracted that a lamp (1) having a cap (3) which is suited to be used in the process and a luminaire (22) having the holder (20), becomes damaged during assembling.

Abstract: A terminal formed by bending from a single metal piece for use in a bulb socket having a bulb insertion opening for accommodating a bulb, where the terminal is used for connecting with a base electrode formed in the outer perimeter of the bulb includes a contact element. The contact element is formed by stamping the metal piece to have a contact portion and a spring portion for resiliently hold the contact portion in contact with the base electrode. The spring portion is located on a position away from the base electrode when the bulb is inserted in the bulb insertion opening. Therefore, the spring porion of the contact element is kept from deterioration of spring characteristics caused by the heat from the bulb.

Abstract: Assembly of a lamp and of its support designed to be inserted into a printed circuit board or the like, characterised in that the lamp (2) is disposed on the support (1) perpendicularly to the axis of snapping the support home into the board, so that the lamp is parallel to the board in its position of use. The support (1) includes wires (5) that extend from the lamp and which are wound around the free ends of a resilient support beam (6) associated with the support (1). The support (1) includes snap catches (12, 13) for engaging the bottom of the board (14). The support (1) further includes a reflective surface (17) for achieving a gain in lighting supplied by the lamp (2).

Abstract: An arc discharge lamp including a two-piece base member having a main housing and a cap disposed at opposite ends of the lamp envelope. The main housing of the base member includes elongated slots to enable the housing to expand outwardly in response to positioning of the press seal. At least one internally-protruding segment formed in the housing is positioned within a detent formed in the press seal region of the lamp. Following positioning of the press seal, the cap is secured to the main housing. The base member is thus secured to the ends of the lamp envelope without the need for basing cements or the like.

Abstract: A socket for a wedge base bulb, in which a cylindrical socket body has an opening for receiving the bulb and a terminal having a pair of opposed contact pieces is mounted in the opening and the contact pieces grip a base portion of the bulb therebetween so as to be electrically connected to the base portion, the improvement comprising: a slot for receiving a rectangular platelike mounting portion of the terminal, which is formed on an inner face of a circumferential wall of the socket body so as to confront the opening; a step portion which projects radially inwardly from an axially lower location of the inner face of the circumferential wall in the slot; wherein when the bulb has a minimum size, the bulb is supported by a lower portion of the mounting portion of the terminal; and wherein when the bulb has a maximum size, an upper portion of the mounting portion of the terminal is deflected radially outwardly by the bulb about a fulcrum defined by an upper edge of the step portion of the slot so as to grip th

Abstract: A contact strip for use with lamp socket devices where an electrical connection is made by the contact strip between a lamp lead and a circuit board conducting surface when the contact strip is assembled in a lamp socket device and mounted on the circuit board. At least one welding area at which a lead of a lamp is welded during assembly of the contact strip in a lamp socket device is provided. The contact strip includes upper and lower electricity receiving strip portions for receiving a circuit board therebetween and for making electrical contact with at least one of upper and lower conducting surfaces of the circuit board.

Abstract: A retaining mechanism, within a lamp socket, includes a single wire spring element mounted external to the lamp socket and protrudes into the lamp socket opening so as to provide insertion interference to ramped projections extending from either end of a lamp wedge base element and frictional retention against the ramped projections when the wedge base element is fully inserted.

Abstract: A miniature bulb assembly adapted to be mounted on a base board includes a socketless miniature bulb, a base portion molded of synthetic resin and a pair of terminal members. The miniature bulb is received in a bulb receiving hole at the central part of the base portion while a pair of lead wires extending from the miniature bulb are inserted through lead wire holes on the bottom wall of the base portion. Each terminal member comprises an elongated plate-shaped terminal and a base fitting portion, both of which are integrated with the base portion during a molding operation. The lead wires are connected to tongue-shaped pieces projecting from lead wire connection tabs in a clamped state. The base portion may be formed with T-shaped terminal insert holes on the opposite sides thereof such that terminal members each having a disengagement preventive tapered portion are tightly inserted thereinto from the above.

Abstract: The electric lamp has a lamp vessel (1) having a pinch seal (2) having two major side faces (7, 8) and two minor side faces (9, 10), the latter being provided with grooves (11, 12). The grooves (11, 12) are widened and deepened towards a respective major side face (7, 8), into which they merge. The lamps can be arranged in a holder by a purely translatory movement and this holder is then elastically deformed. The holder has rigid holding members, which engage into a respective groove and can move therein by subjecting the lamp to a rotation.

Abstract: A subminiature terminal (10; FIGS. 5 and 6A & 6B) for mechanically holding and electrically interconnecting a wedge-base bulb (1; FIGS. 1 & 2) into a circuit in, for example, an automotive application, in which the electrical and mechanical retention forces balance out, in a preferred manner (FIGS. 4 & 4A), preventing undesired rotation (tilting) of the bulb held between opposed terminal pairs seated in a connector system (not illustrated). The terminal includes conductor and insulation grips (11), a body or base (12) (the structural part), a mechanical retention spring (13), and an electrical contact spring (14).

Abstract: A common ground terminal is adapted for use with wedgebase lamp bulbs of either the single filament of dual filament type in a single filament lamp socket. The common ground terminal has a pair of opposed, upper and lower spring contact arms which biasingly engage opposite sides of a wedgebase when it is inserted into the space between the spring contact arms. The lower spring contact arm has a second spring tab which accommodates the presence of a second contact wire when the dual filament type of wedgebase lamp bulb is used.

Abstract: A Christmas tree light consisting of a bulb with two leads extending from its lower end, a hollow seat, and a separation wedge. The hollow seat has an upper seat portion and a lower seat portion. A slot runs lengthwise along the lower end of the lower seat portion for receiving and frictionally engaging with the separation wedge.

Abstract: A wedge-type lamp bulb assembly consists of a bulb containing a filament and a wedge-shaped base extending from the bulb. Several lead wires connected to the filament are led out from the bottom of the wedge-shaped base, and folded along the front and rear sides of the wedge-shaped base. There are provided inside the socket in which the wedge-shaped base is removably held a plurality of terminals which are in resilient contact with the lead wires, and a pair of guide protrusions is formed on the inner walls of the socket along the inserting direction of the wedge-type lamp bulb. There is formed on the front and rear sides of the wedge-shaped base in positions corresponding to the pair of guide protrusions a pair of protrusions defining guide ways through which the guide protrusions are passed. Thus, the wedge-type bulb can be easily assembled into the socket and also securely held therein.

Abstract: An incandescent lamp comprises a glass envelope, a filament supported by constricted portions of the glass envelope, lead rods extending from both ends of the filament, tapered constricted portions at both ends of the glass tube to provide sealing portions by which the lead rods are surrounded respectively, and contacts connected to the outer ends of the lead rods respectively. The sealing ports are formed in such a manner that their outer diameters are equal to or smaller than those of the respective contacts, cylindrical bases are arranged so as to enclose the respective contacts, portions of the lead rods which project out of the sealing portions, and the sealing portions, and to be in contact with the respective tapered portions following the sealing portions, and fixing cement is filled in the bases.

Abstract: A relieved plastic lamp base has been discovered to substantially eliminated cracking of the captured press seal. The relieved base has a formed cavity for receiving the press seal of an electric lamp. The cavity has a first internal base wall to couple with a first exterior lamp wall of the lamp, a second internal base wall to couple with a second exterior lamp wall of the lamp and, cavity portion formed in the internal base wall intermediate the first interior wall and second interior wall of the lamp. The relief cavity is opposite a seam area of the press seal when the press seal is positioned in the lamp base. The relief accommodates excess material due to tool variations, tool wear, and press variations and thereby allows longer tool operation between tooling changes. The relief also accepts a wider variation in noncritical seal measurements. The relief lessens the likelihood of chipping the seal corner, and displaces the holding forces that tend to open a corner chip.

Abstract: A socket and bulb snap fastener for Christmas light strings includes at least one T-shaped tongue and a corresponding number of receiving means. The T-shaped tongue with a shoulder formed adjacent to a free end of the tongue is formed on an upper margin of a periphery of a socket of the bulb string for a Christmas tree. A V-shaped groove is formed on an upper side of each T-shaped tongue at an end opposite to the free end of the tongue and extends transversely across a length of each tongue. The receiving means is formed, corresponding to each T-shaped tongue, in the vicinity of an upper margin of an insert of the bulb string. The receiving means includes a compartment for receiving the tongue and a path through which the tongue is passable.

Abstract: A single filament type wedge-base lamp has projections on opposite sides at opposite end portions of a flat base of the lamp, and the corresponding socket has a recess with clearance grooves corresponding in position to the projections. The socket for a double filament type wedge-base lamp has a recess without clearance grooves so that the single filament type wedge-base lamp, which has the projections thereon, is prevented from erroneously being inserted into the double-filament type lamp socket since the projections will interfere with the recess walls of the double-filament type lamp socket. If a double filament type lamp is inserted into the socket for a single filament type lamp, either one of the two filaments thereof will operate without posing a problem.

Abstract: A low-pressure discharge lamp includes a bulb and a pair of bases attached to the end portions of the bulb, respectively. Each base has a base body fixed to the end of the bulb and a pair of terminals attached to the periphery of the base body. The terminals have contact portions which project from the periphery of the base body and include contact surfaces extending parallel to the axis of the bulb and facing the same direction. The contact surfaces are located so as to contact a common plane.

Abstract: A wedge-base lamp and socket assembly includes a wedge-base lamp having a pair of projections formed on opposite sides near the center of a base of the wedge-base lamp; and a socket having a pair of resilient arms which come in engagement with the pair of projections when the wedge-base lamp is mounted within the socket. A single filament type wedge-base lamp has fool-proof projections formed on opposite sides at opposite end portions of the base, and a double filament type wedge base socket has abutment portions which come in engagement with the fool-proof projections when the single filament type wedge-base lamp is inserted into the double filament type socket to thereby prevent erroneous coupling therebetween.