JP2003100402A - Fluorescent lamp socket and illumination fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fluorescent lamp socket inexpensive and superior in mounting workability as well as in mounting reliability. SOLUTION: This device is premised on the fluorescent lamp socket of a pinching type, that has a socket body 21 in which a lamp pin inserting hole 25 is opened in the front face wall 21a and whose rear face is opened, that has a rear face cover 22 coupled with this body 21 by occluding its rear face, and that has a pair of contact pieces 24 to pinch a lamp pin housed in the body 21 and inserted into the inserting hole 25. The body 21 is made of a synthetic resin with a high flame-resistance. The rear face cover 22 is made of a synthetic resin with a lower flame-resistance than that of the body 21. A pair of mounting claws 43 is integrally formed which protrudes toward the rear face direction on the both sides of the width direction of the rear face cover 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention rotates a straight tube type fluorescent lamp inserted through a lamp pin insertion hole in a socket body by 90 degrees so that the lamp pins of the fluorescent lamp are arranged in the socket body from both sides in the arrangement direction. The present invention relates to a fluorescent lamp socket that supports a fluorescent lamp by sandwiching the fluorescent lamp socket with the contact piece, and a lighting fixture including the socket.

[0002]

2. Description of the Related Art Some fluorescent lamp sockets have a plurality of mounting claws that project toward the rear side. This socket can be attached to the socket mounting portion by passing the mounting nail through a nail receiving hole formed in the socket mounting portion on the instrument body side and hooking each nail on the edge of the nail receiving hole.

In this type of fluorescent lamp socket, mounting claws are integrally projected from both side walls in the width direction of the socket body that accommodates the contact pieces that support the inserted lamp pins.
The back opening of the socket body is closed by a back cover.

In the fluorescent lamp socket, abnormal heat generation may occur at the contact portion between the contact piece and the lamp pin supported by the contact piece. However, it should be avoided that the fluorescent lamp socket burns due to this heat generation. I won't.

As a countermeasure against this, conventionally, the socket body and the back cover are molded with a highly flame-retardant synthetic resin such as PBT (polybutylene terephthalate). However, a molded product of synthetic resin having high flame retardancy has a characteristic that it is hard and brittle.

By the way, the fluorescent lamp socket is mounted on the socket mounting portion by an operator grasping the base side of a pair of mounting claws integrally formed on both side walls of the socket body with a thumb and forefinger. It is carried out by inserting it into the nail receiving hole of.

In this case, the projection length of the mounting claw from both side walls of the socket body is short, and the mounting claw is hard. Therefore, it is not easy to deform the pair of mounting claws according to the claw receiving holes of the socket mounting portion, and the insertion is difficult. Therefore, the workability of attaching the fluorescent lamp socket is not good.

Furthermore, since the mounting claws are fragile, it is possible that the mounting claws may break due to external vibration acting in response to an earthquake or the like. If the mounting claw is broken, the fluorescent lamp socket may fall off from the socket mounting portion.

The fluorescent lamp sockets having the mounting claws as described above are used as a set of two in order to individually support both ends of the straight tube type fluorescent lamp. In this case, in order to absorb the variation in the axial length of the straight tube type fluorescent lamp and prevent the fluorescent lamp socket from rattling, the back cover of one fluorescent lamp socket and this one fluorescent lamp socket are installed. The leaf spring is sandwiched between the socket mounting portion and the socket mounting portion in a compressed state. Due to such circumstances, the length of the mounting claw of the one fluorescent lamp socket is different from the length of the mounting claw of the other fluorescent lamp socket.

Therefore, two types of molds are used to mold the socket body having the mounting claws. However, the socket body has a large number of rib-shaped portions for supporting the insertion holes of the electric wires and the contact pieces, and has a complicated structure as compared with the back cover. Accordingly, the structure of the two types of molding dies for molding the socket body is naturally complicated,
Their mold cost is high. Therefore, the molding cost of the socket body is high, which causes an increase in the cost of the fluorescent lamp socket.

[0011]

A first problem to be solved by the present invention is to obtain an inexpensive fluorescent lamp socket.

A second problem to be solved by the present invention is
Another object of the present invention is to obtain a fluorescent lamp socket which is inexpensive and has excellent workability in installation and reliability in installation.

The third problem to be solved by the present invention is
An object of the present invention is to obtain a lighting fixture capable of preventing the fluorescent lamp socket from being accidentally dropped.

[0014]

In order to solve the first problem, a fluorescent lamp socket of the invention according to claim 1 has a front wall having a lamp pin insertion hole, and contacts the front wall. A synthetic resin socket body provided with a one-sided support and having an opening on the back surface, and a plurality of mounting claws that are connected to the socket body by closing the opening on the back surface and project toward the back surface are integrally formed. Lamp pin which is composed of a synthetic resin back cover and a conductive leaf spring, is supported by the contact piece support so as to face the lamp pin insertion hole, is accommodated in the socket body, and is inserted into the lamp pin insertion hole. And a contact piece for sandwiching.

According to the present invention, since the mounting claws are projected on the rear cover having a simpler structure than the socket body,
Only one type of molding die for the socket body having a complicated structure is required, and the die cost can be reduced. Moreover, as described above, the structure of the back cover is simpler than that of the socket body, even though the back cover is provided with the claws. Even though two types of molds are needed, the cost of those molds is low. Therefore, the total die cost can be reduced.

In order to solve the second problem, according to the invention of claim 2, the back cover is made of a synthetic resin having a lower flame retardancy than the synthetic resin of which the socket body according to claim 1 is made. Is characterized by.

When the fluorescent lamp socket of the present invention is attached to the metal socket mounting portion of the lighting fixture by using the mounting claws, the back cover has a highly flame-retardant socket body and a non-combustible socket. Since it is covered with the mounting portion, the flame retardancy of the entire fluorescent lamp socket can be secured despite the flame retardancy of the back cover being low. The rear cover made of synthetic resin having low flame retardancy is neither hard nor brittle like a socket body made of synthetic resin having high flame retardancy. Therefore, the mounting claw protruding from the back cover is easily bent when it is inserted into the claw receiving hole of the socket mounting portion, and is easily bent in the use state according to a load such as vibration acting on the claw. .

According to a third aspect of the present invention, the mounting claw according to the first or second aspect of the present invention has a root portion protruding from the peripheral edge of the back cover in the front direction, and a tip portion which is folded back from the root portion in the back direction. It is characterized in that it is formed from an arm portion that forms a hook portion.

In the present invention, the length of the arm portion is increased according to the amount of the root portion protruding in the front direction, so that the arm portion can be easily bent.

According to a fourth aspect of the present invention, a notch having a size corresponding to the root portion of the third aspect is provided on a side wall of the socket body, and an edge of the notch is superposed on an outer surface of an edge portion of the root portion. It is characterized by that.

According to the present invention, when the lamp socket receives a load in the width direction, the root part of the mounting claw moves so that the angle formed by the base part and the flat cover forms an obtuse angle close to 90 degrees. This can be prevented by the side wall of the socket body that overlaps the outer surface of the root edge.

According to a fifth aspect of the present invention, the contact piece support according to any one of the first to fourth aspects comprises a source side contact piece support for supporting an electric wire connecting portion side of the contact piece, and the contact. A tip-side contact piece support that supports the tip portion on the side opposite to the electric wire connection portion of the piece, and at least one of the corresponding contact pieces has a tip portion that is the tip portion of the other contact piece. It is characterized in that the contact piece is supported over the original side contact piece support and the tip side contact piece support in a state of being elastically deformed toward the side.

According to the present invention, abnormal heat is generated at the contact portion between the contact piece and the lamp pin supported by the contact piece, and the tip side contact piece support of the socket body supporting the contact piece is overheated. When the supporting performance of the support disappears, the contact piece that has been bent at that time is restored to the free state by its elastic force. Accordingly, the contact piece is automatically separated from the lamp pin so that the abnormal heat generation does not continue.

The invention of claim 6 is characterized in that the tip side contact piece support of claim 5 is formed so as to be more easily melted than the original side contact piece support.

In the present invention, when abnormal heat is generated at the contact portion between the contact piece and the lamp pin supported by the contact piece,
Before the socket body reaches a burning state, the tip side contact piece support is melted faster than the original contact piece support by heat conduction from the contact piece, and the abnormal heat generation can be eliminated.

The invention of claim 7 is characterized in that the tip side contact piece support described in claim 6 is made smaller than the original side contact piece support.

According to the present invention, when abnormal heat is generated at the contact portion between the contact piece and the lamp pin supported by the contact piece,
Before the socket body reaches a burning state, the tip side contact piece support having a small heat capacity is melted faster than the original side contact piece support by heat conduction from the contact piece, and the abnormal heat generation can be eliminated.

The invention according to claim 8 is characterized in that the thickness of the tip side contact piece support according to claim 6 or 7 is made thinner than the thickness of the front wall.

According to the present invention, when abnormal heat is generated at the contact portion between the contact piece and the lamp pin supported by the contact piece,
Before the front wall of the socket body reaches a burning state, the tip side contact piece support is melted by heat conduction from the contact piece, and the abnormal heat generation can be eliminated.

The invention of claim 9 is characterized in that the tip side contact piece support according to any one of claims 6 to 8 is formed of a synthetic resin having heat resistance lower than that of the front wall. There is.

According to the present invention, when abnormal heat is generated at the contact portion between the contact piece and the lamp pin supported by the contact piece,
Before the front wall of the socket body reaches a burning state, the tip side contact piece support, which is more easily melted than the front wall, is melted by heat conduction from the contact piece, and the abnormal heat generation can be eliminated.

A fluorescent lamp socket according to a tenth aspect of the present invention has a front wall having a lamp pin insertion hole, a contact piece support provided on the front wall, and a synthetic resin socket having a rear surface opened. A body, a rear cover made of synthetic resin, which is connected to the socket body by closing the opening on the rear surface and integrally formed with a plurality of mounting claws protruding in the rear direction, and a conductive leaf spring, A contact piece which is supported by the contact piece support so as to face the lamp pin insertion hole and is housed in the socket body, and which holds a pair of lamp pins inserted into the lamp pin insertion hole, and a few minute cut portions. Is integrally formed with the socket body via a through hole, and is separated from the socket body by cutting at the planned cutting portion and incorporated into the socket body. It is, is characterized by comprising a synthetic resin-made rotor rotatably disposed in said contact pieces.

Also in the present invention, as in the first aspect of the present invention, since the mounting claws are projected on the rear cover having a simpler structure than the socket body, there is only one type of molding die for the socket body having a complicated structure. The mold cost can be reduced.
Moreover, as described above, the structure of the back cover is simpler than that of the socket body, even though the back cover is provided with the claws. Despite the need for two molds,
Their mold costs are also low.

The invention of claim 11 is characterized in that the planned cutting portion is provided at a position which is non-axisymmetric with respect to a center line that bisects the socket body according to claim 10 in the width direction.

When the socket body is molded using a molding die, the molten synthetic resin material is generally injected from the pouring ports at the positions corresponding to both sides in the width direction of the socket body. Therefore, a weld line is formed at a position corresponding to a center line that divides the socket body into two in the width direction. By the way, in the present invention, since the planned cutting portion for separating the rotor integrally molded with the socket body from the socket body is provided at a position which is axisymmetric with respect to the center line, Is formed by intersecting the center line. Therefore, in the narrow joint part that closes the inside of the escape groove provided in the rotor to allow the passage of the lamp pin,
No weld line is formed. Therefore, there is no fear that the strength of the joint portion will be reduced due to the weld line.

The invention of claim 12 is characterized in that the planned cutting portion of claim 11 is provided in three or more places.

According to the present invention, the rotor is integrally connected to the socket body even if the portion to be cut is made small enough to supply the synthetic resin material from the socket body to the rotor. 3 in handling
Since it is possible to prevent the rotor from oscillating repeatedly at the above-mentioned planned cutting portion, it is possible to prevent the planned cutting portion from being accidentally cut. Moreover, as described above, the portion to be cut is small and its strength is low, so that the rotor can be easily separated from the socket body.

In order to solve the third problem, an illumination device according to a thirteenth aspect of the invention has a chassis having a socket mounting portion having a plurality of claw receiving holes and a socket mounting portion mounted on the chassis. A fluorescent lamp socket according to any one of claims 1 to 12 and a fluorescent lamp detachably supported by the lamp socket are provided.

According to the present invention, since the fluorescent lamp socket according to any one of claims 1 to 12 is provided, the connection between the mounting claw of the socket and the claw receiving hole of the socket mounting portion is reliable, Since the fluorescent lamp socket has a high mounting reliability, it is possible to provide a lighting device capable of preventing the fluorescent lamp socket from being accidentally dropped.

[0040]

DETAILED DESCRIPTION OF THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 11 in FIG. 1 denotes a fluorescent lamp lighting fixture installed, for example, by being embedded in the ceiling of a building.
It has a metal chassis 12 whose lower surface is open.
Non-combustible end plates 12a arranged at both longitudinal ends of the chassis 12 are used as socket mounting portions, and a fluorescent lamp socket (hereinafter abbreviated as a socket) 13 is attached to each of the end plates 12a of the chassis 12. It is installed facing the inside.

A straight tube type fluorescent lamp 14 is detachably supported over a socket 13 opposed to the longitudinal direction of the chassis 12. A leaf spring (not shown) is sandwiched in a compressed state between one end plate 12a and a rear cover (to be described later) included in the socket 13 attached to the end plate 12a. Reference numeral 15 in FIG. 1 denotes a reflector having a V-shaped cross section, which is arranged between the fluorescent lamps 14 so as to cover a lighting device (not shown) and the like.

As shown in FIGS. 3 and 7, the socket 13
Includes a socket body 21, a back cover 22, a rotor 23, and at least one set, for example, a pair of contact pieces 24.

As shown in FIGS. 4 and 5, the socket body 21 and the rotor 23 are made of a highly flame-retardant synthetic resin, for example, highly flame-retardant PBT (polybutylene terephthalate). The socket body 21 and the rotor 23 are integrated in a semi-finished product before the socket 13 is assembled.

The socket body 21 has a front wall 21a whose one end has an arc shape. The back surface of this body 21 is opened. A circular lamp pin insertion hole 25 is formed in the front wall 21a. As shown in FIG. 3 and the like, the socket body 21 is provided with a lamp pin insertion / removal groove 26 extending from the arcuate wall portion 21b to the front wall 21a,
The groove 26 communicates with the lamp pin insertion hole 25.

At the base end portion 21c of the socket body 21 opposite to the arcuate wall portion 21b, a plurality of tapered wire connection holes 27 are formed inside and outside the socket body 21 as shown in FIGS. It is provided in communication. The base end portion 21c and the arcuate wall portion 21b are integrally connected by a side wall 21d bent from the side edge of the front wall 21a to the back side at a substantially right angle. Notch 2 that opens to the rear end surface of the side wall 21d
8 are provided respectively.

A pair of front end side contact piece supports 29, a pair of first source side contact piece supports 30 and a pair of second source side contact piece supports 31 are integrally provided on the back surface of the front wall 21a. ing. Each of the contact piece supports 29 to 31 is formed at a position symmetrical with respect to a center line L that bisects the socket body 21 in the width direction.

The tip side contact piece support 29 provided close to the arcuate wall portion 21b is formed so as to be more easily melted than the front wall 21a and the first original side contact piece support 30. for that reason,
The contact piece support 29 is formed to be thinner than the front wall 21a and smaller than the first source side contact piece support 30. In the illustrated case, the contact piece support 29 is formed by a small projection having a small heat capacity.

The second original side contact piece 31 is formed at the base end 21c, and the first original side contact piece support 30 is formed close to the second original side contact piece 31. The first original side contact piece support 30 is larger than the contact piece support 29, and the front wall 2
The groove 30a is formed by a rib having the same thickness as 1a.
have.

As shown in FIG. 2 (D), the socket body 21 is provided with a claw hooking hole 32 for communicating the inside and the outside in the center of the base end portion 21c in the width direction, and as shown in FIGS. 4 and 5. The pair of locking claws 33 are integrally projecting toward the inner side of the socket body 21 and are located near a portion where the arcuate wall portion 21b and the side wall 21d are continuous.

The back cover 22 is made of a synthetic resin such as PBT which has lower flame retardancy than the socket body 21 and the rotor 23. As shown in FIG. 3, one locking claw 41 and a pair of claw hooking grooves 42 (only one of which is shown) are formed in the peripheral portion of the back cover 22. This back cover 22 is
By hooking the locking claws 41 in the claw hooking holes 32 and hooking the claw hooking grooves 42 in the locking claws 33 respectively,
It is connected to the socket body 21 by closing its rear opening. In this attached state, the back cover 22 is fitted into the back portion of the socket body 21.

At the peripheral edge of the back cover 22, mounting claws 43 located on both sides in the width direction are integrally provided so as to project in the back direction on the side opposite to the socket body 21. The pair of attachment claws 43 are formed of a root portion 43a and an arm portion 43b as shown in detail in FIG. The root part 43a is projected in the front direction, and the arm part 43b is folded back in the back direction with a gap g provided between it and the root part 43a. A tip portion of the arm portion 43b forms a hook portion 43c. The hooking portion 43c is inserted into a hook receiving hole (not shown) formed in the end plate 12a and hooked therein, whereby the socket 13 is attached to the inner surface of the end plate 12a while being prevented from coming off. .

By attaching the back cover 22 to the socket body 21 described above, the notch 28 is formed on the outer surface of the edge portion of the root portion 43a as shown in FIGS. 2 (A) and 7 (B).
7A are overlapped with each other to prevent the root portion 43a from falling down toward the outer side in the socket width direction shown by the arrow direction in FIG. 7B.

As shown in FIG. 3 and the like, a substantially circular rib 44 corresponding to the lamp pin insertion hole 25 is integrally provided on the inner surface of the back cover 22 so as to project forward.
A moderation recess 44a is formed every 0 degree. A rotor guide 45 is integrally provided on the inner surface of the back cover 22 so as to be located at the center of the rib 44 and to face forward. The guide 45 includes a pair of pin insertion grooves 45a facing each other in the radial direction.
And a locking edge 45b slightly protruding outward in the radial direction is formed.

As shown in FIGS. 4 to 6, the rotor 23
Has a pair of flanges 51 projecting radially outward at its front end. Further, the rotor 23 is opened between a pair of flanges 51 and a pair of frontward pin insertion grooves 52 facing each other in the radial direction, and is opened at the rear end of the rotor 23 at 90 degrees from the pin pushing grooves 52. In addition, it has a pair of rearward facing grooves 53 that face each other in the radial direction.

Rotor 2 housed in socket body 21
3 is fitted in the rotor guide 45 and is rotatably supported along the circumferential direction. In this housed state, the rear end of the rotor 23 on the rear cover 22 side is fitted inside the rib 44, and the locking edge 45b of the rotor guide 45 is a circle formed at the base of the flange 51. It is engaged with the arcuate recess 54.

Moderation projections 56 are provided on the outer surfaces of a pair of thin bridge-shaped connecting portions 55 that close the inside of the pin insertion groove 52 of the rotor 23. These projections 56 can be engaged with and disengaged from the recesses 44a of the ribs 44, and the engagement thereof prevents the rotor 23 from rotating. The protrusion 56 is disengaged from the recess 44a so that the pair of protrusions 56 corresponding to the radial direction are brought close to each other when the rotor 23 is rotated by a lamp pin (not shown).
3 is elastically deformed. The elastic deformation in this case is possible due to the existence of the pair of rearward facing grooves 53.

The rotor 23 is a front wall 2 of the socket body 21 in the state of a semi-finished product before the socket 13 is assembled.
It is integrally connected to 1a. That is, FIG.
As shown in FIG. 3 and FIG. 5 (A), the pair of flanges 51 and the hole edge of the lamp pin insertion hole 21 are to be cut 5
It is connected to each one through 7. The pair of planned cutting portions 57 has a bridge shape with a minute cross section, and can be easily cut by applying an external force of a certain amount or more to the rotor 23. In the state before the scheduled cutting portion 57 is cut, as shown in FIG. 3 and FIG.
The front side portion of is projected from the front surface of the front wall 21c and is provided so as to be pushed into the rear cover 22 side for the cutting.

Each of the parts to be cut 57 has a socket body 21.
Also, when molding the rotor 23, it is used as a passage for the synthetic resin material from the socket body 21 to the rotor 23. These planned cutting portions 57 are provided so as to deviate from positions that are line-symmetric with respect to the center line L, that is, to be non-line-symmetric. In this embodiment, the rotor 23
A pair of planned cutting portions 57 are provided at the point symmetric positions with the center Q of the as the center of symmetry.

The provision of the pair of planned cutting portions 57 in this way is excellent in that the strength of the joint portion 55 that receives a force each time the rotor 23 is rotated can be suppressed.

That is, the socket body 21 and the rotor 2
The molding of No. 3 is performed by injecting the molten synthetic resin material into the molding die from the pouring ports at the positions corresponding to the widthwise both sides of the socket body 21. Therefore, the socket body 2
The weld line of the synthetic resin material forming 1 (a line formed as a boundary at a position where the synthetic resin materials pressed from different directions in the molding die are combined) is formed on the center line L. Nevertheless, since the planned cutting portion 57 is provided at a position which is asymmetric with respect to the center line L,
The weld line of the synthetic resin material supplied to the rotor 23 through the pair of cutting planned portions 57 is formed so as to intersect the center line L. In other words, no weld line is formed in the joint portion 55.

It is generally known that cracks are likely to occur in the weld line, and that this tends to cause cracks. Therefore, in the structure in which the weld line is not provided in the joint portion 55 as described above, it is possible to eliminate the possibility that the strength of the joint portion 55 is lowered. Therefore, as described above, since the joint portion 55 receives a force each time the moderation of the rotor 23 occurs, the joint portion 55 is not likely to be broken due to the weld line, so that the rotor 23 and the socket 13 are durable. You can improve the property.

The pair of contact pieces 24 are formed of conductive leaf springs. As shown in FIGS. 3 and 4, the contact piece 24
An electric wire connecting portion 61 having a locking structure is formed at one end portion thereof, and the other end portion side of the contact piece 24 forms a lamp pin contact portion 62 having a V-shaped bend in the central portion in the longitudinal direction. The lamp pin contact portion 62 is formed by bending at the base 62a.

As shown in FIG. 4B, these contact pieces 24 are housed in the socket body 21 at positions symmetrical with respect to the center line L. Specifically, the intermediate portion of the contact piece 24 on the side of the electric wire connecting portion 61 a little from the root 62a is connected to the first contact piece support 3
0 through the groove 30a, the wire connecting portion 61 is fitted into the second source side contact piece support 31, and the lamp pin contact portion 6
By supporting the tip end portion 62 b of the second end on the tip end side contact piece support 29, the contact piece 24 is supported over the second source side contact piece support 31 and the tip side contact piece support 29. In this case, the contact pieces 24 are assembled into the socket body 21 by elastically deforming the lamp pin contact portions 62 of the pair of contact pieces 24 from the free state so as to approach each other. By this assembly, a pair of lamp pin contact portions 62 held in a bent state are provided so as to sandwich the cylindrical portion of the rotor 23 in which the grooves 52 and 53 are provided from both sides in the radial direction.

In the socket 13 having the above-described structure, after the pair of contact pieces 24 are incorporated into the socket body 21 as described above, the rotor guide 45 is inserted into the rotor 23 from the rear side thereof.
, The rear cover 23 is connected to the back of the socket body 22, and then the rotor 23 is assembled by pushing the rotor 51 so that its flange 51 is substantially flush with the front surface of the front wall 21a. The rotor 23 is separated from the socket body 21 by the pressing, with the cutting of the planned cutting portion 57. At the same time, the rotor 23 is properly fitted to the rotor guide 45, and the locking edge 45a and the recess 5 are formed.
4 are engaged with each other to prevent the rotor 23 from coming out forward. The engagement of the locking edge 45a with the recess 54 is possible because the rotor 23 can elastically deform due to the presence of the pair of pin insertion grooves 52.

The assembled socket 13 is directly attached to the inner surface of the end plate 12a by inserting the pair of mounting claws 43 into the claw receiving holes (not shown) of the end plate 12a which is an incombustible material. And in this state, socket 1
An electric wire (not shown) is inserted into the electric wire connection hole 27 of No. 3,
The core wire is inserted and connected to the electric wire connecting portion 61 of the contact piece 24. Further, in the lamp pin insertion hole 25 of the socket 13,
The lamp pin of the fluorescent lamp 14 is inserted through the lamp pin insertion / removal groove 26, and in this inserted state, the fluorescent lamp 14 is inserted.
Is rotated 90 degrees. Along with that, the rotor 23 is also rotated 90 degrees via the lamp pin arranged in the pin insertion groove 52, and upon completion of the rotation, the lamp pin comes into contact with the lamp pin contact portion 62 of the contact piece 24. In this used state, the pair of lamp pins are elastically sandwiched by the pair of contact pieces 24 from both sides in the arrangement direction.

As described above, the fluorescent lamp 1 is installed in the socket 13.
In the state in which the lamp 14 is supported and the lamp 14 is lit, if abnormal heat generation occurs at the contact portion between the contact piece 24 and the lamp pin supported by the contact piece 24, the heat causes the contact piece 24 to heat. Through the contact piece supports 29 to 31 supporting the same. Then, the tip-side contact piece support 29 having the smallest heat capacity, the front wall 21a and the original-side contact piece support 30,
Prior to 31, it becomes overheated and softens and begins to melt.

As a result, the contact piece 2 by the support 29 is provided.
When the support performance of No. 4 disappears, the lamp pin contact portion 62 of the contact piece 24 that has been bent as shown in FIG. Restore to the free state as shown. Note that reference numeral 2 in FIG.
9a shows the trace of the melted tip side contact piece support 29.
By restoring the lamp pin contact portion 62 as described above, the contact piece 24 is automatically separated from the lamp pin and the abnormal heat generation can be prevented from continuing. Therefore, since the abnormal heat generation can be eliminated before the socket body 21 reaches the burning state, the socket 13 is not likely to burn due to the abnormal heat generation at the contact portion, and the safety is high.

By the way, the socket 13 having the above-mentioned structure is directly attached to the end plate 12a by the pair of mounting claws 43 as described above, but these mounting claws 43 are integrated with the rear cover 22 instead of the socket body 21. It is provided in. The structure of the back cover 22 is simpler than that of the socket body 21 because it does not have a structure for supporting the contact piece 24 or a wire connection hole 27 for connecting a wire.

Therefore, in order to make the back cover 22 having the mounting claws 43 on the basis of the lengths of the mounting claws 43 of the pair of sockets 13 supporting the both ends of the fluorescent lamp 14, there are two types. Requires a mold for molding. However, since the mold structure of the back cover 22 is simpler than the mold for molding one type of socket body 21,
The mold cost is low. Moreover, the molding die for the socket body 21 is not required to be a simple pair of mating dies in order to form the wire connection hole 27, and a slide die for forming the wire connection hole 27 is required. Therefore, the socket body 21
Since only one type of molding die can be used, the die cost of the entire socket can be greatly reduced. Therefore, the socket 13 can be obtained at low cost, and accordingly, the socket 13 can be obtained.
It is possible to reduce the cost of the luminaire 11 including.

In the socket 13 having the above structure, the rear cover 22 having the pair of mounting claws 43 projecting therefrom is formed of a synthetic resin having a lower flame retardancy than the synthetic resin forming the socket body 21. Therefore, when the socket 13 is attached to the chassis 12, the back cover 22 is covered with the highly flame-retardant socket body 21 and the end plate 12a which is an incombustible material. Therefore, it is possible to secure the flame retardancy of the entire socket 13 although the rear cover 22 has low flame retardancy.

Moreover, the rear cover 22 made of synthetic resin having low flame retardancy is neither hard nor brittle like the socket body 21 made of synthetic resin having high flame retardancy. Therefore, the arm portions 43b of the pair of mounting claws 43 that are integrally provided on both ends of the rear cover 22 in the width direction are inserted into holes (not shown) of the end plate 12a to mount the socket 13 on the end plate 12a. When performing, the pair of arm portions 43b can be relatively easily bent while being gripped by the operator's thumb and forefinger.

Not only that, but the mounting claw 43 is formed by folding back the arm portion 43b from the root portion 43a that has once been projected forward to the back side, so that the root portion 43a.
The arm portion 43b is elongated according to the amount of protrusion. Therefore, the arm portion 43b of the mounting claw 43 held by the finger is more easily bent.

Therefore, since the pair of mounting claws 43 can be easily inserted into the claw receiving holes, the workability of mounting the socket 13 can be improved.

Further, as described above, the arm portion 43b of the mounting claw 43 is easily bent, so that the mounting claw 43 can be moved in response to an earthquake or the like.
The load acting on can be reduced by the bending of the arm portion 43b. Therefore, the pair of mounting claws 43 is prevented from being broken, and the socket 13 to the end plate 12a of the chassis 12 is prevented.
Installation reliability is high. Therefore, it is possible to prevent the socket 13 from being accidentally dropped.

In addition, the base portions 43 of the pair of mounting claws 43
Since the edge of the notch 28 of the socket body 21 is overlapped with the outer surface of the edge portion of a, when the mounting claw 43 receives a load due to vibration or the like, the root portion 43a forms an angle between the root portion 43a and the back cover 22. Is moved in the direction of the arrow in FIG. 7 (B) so that it forms an obtuse angle close to 90 degrees.
This can be prevented by the side wall 21d of No. 1. As described above, the load acting on the mounting claw 43 reduces the risk that the root 43a of the mounting claw 43 is inadvertently moved and the mounting claw 43 is disengaged from the claw receiving hole of the end plate 12a. The mounting reliability is high and it is possible to prevent the socket 13 from being accidentally dropped.

FIG. 8 shows a second embodiment of the present invention. Since this embodiment has basically the same configuration as that of the first embodiment, the same components are designated by the same reference numerals as those of the first embodiment, and the description of the configuration and operation thereof is omitted. Will be described.

In the second embodiment, the portion to be cut 57 of the rotor 23 with respect to the socket body 21 in a semi-finished product state.
Are evenly distributed in the circumferential direction (more than three places)
It is provided. In this case, it is advisable to provide the three planned cutting portions 57 at positions asymmetric with respect to the center line L. In addition,
The configuration other than this point is the same as that of the first embodiment including the configuration not shown in FIG.

The second embodiment is excellent in the following points in addition to the function and effect described in the first embodiment. That is,
If the number of the planned cutting portions 57 is three or more, the supporting strength of the rotor 23 with respect to the socket body 21 can be made larger than that in the case of two. Therefore, even if the planned cutting portion 57 is made small in a range necessary and sufficient to supply the synthetic resin material from the socket body 21 to the rotor 23, the rotor 23 is connected to the socket body 21 in a semi-finished product state. It is possible to prevent the rotor 23 from being repeatedly shaken when handling the above. Therefore, it is possible to prevent the planned cutting portion 23 from being cut carelessly. Moreover, as described above, each of the planned cutting portions 57 can be made small, so that their strength is naturally low. Therefore, when the rotor 23 is pushed in, the rotor 23 can be easily separated from the socket body 21 and installed in an appropriate position.

FIG. 9 shows a third embodiment of the present invention. Since this embodiment has basically the same configuration as that of the first embodiment, the same components are designated by the same reference numerals as those of the first embodiment, and the description of the configuration and operation thereof is omitted. Will be described.

In the third embodiment, the tip side contact piece support 29 for supporting the lamp pin contact portion 62 of the contact piece 24 in a bent state is made of a synthetic resin different from the socket body 21. The contact piece support 29 is made of synthetic resin having lower heat resistance than the front wall 21a of the socket body 21, and is integrally provided on the back surface of the front wall 21a. The configuration other than this point is the same as the first configuration including the configuration not shown in FIG.
This is the same as the embodiment.

The third embodiment is excellent in the following points in addition to the function and effect described in the first embodiment. That is,
The melting temperature of the tip-side contact piece support 29 can be set by selecting the material of the support 29 without being restricted by the highly flame-retardant synthetic resin forming the socket body 21. Therefore, when abnormal heat is generated at the contact portion between the contact piece 24 and the lamp pin supported by the contact piece 24 in the usage state of the socket 13, before the front wall 21a reaches a state where it burns, The tip side contact piece support 29 which is also easily melted,
It can be melted by heat conduction from the contact piece 24. Therefore, there is no risk of the socket 13 burning due to abnormal heat generation at the contact portion, and safety can be improved.

The fluorescent lamp sot of the present invention can be implemented as a fluorescent lamp sot supporting two fluorescent lamps.

[0084]

The present invention is carried out in the form as described above, and has the following effects.

According to the first aspect of the present invention, since the mounting claws are provided on the rear cover having a simpler structure than the socket body, the die cost for molding the socket body can be reduced. An inexpensive fluorescent lamp socket can be provided.

According to the second aspect of the present invention, the mounting claw protruding from the rear cover made of synthetic resin having low flame retardance can be easily deformed and inserted in accordance with the claw receiving hole of the socket mounting portion. At the same time, it is possible to reduce the load applied by the bending of the mounting claws due to an earthquake or the like, so that it is possible to provide a fluorescent lamp socket having excellent mounting workability and mounting reliability.

According to the third aspect of the invention, since the arm portion of the mounting claw is easily bent, it is possible to provide a fluorescent lamp socket having excellent mounting workability and mounting reliability.

According to the invention of claim 4, when the mounting claw receives a load, the root portion of the mounting claw is inadvertently moved, and the mounting claw is less likely to come off from the socket mounting part of the lighting fixture. Can be provided.

According to the invention of claim 5, when abnormal heat is generated at the contact portion between the contact piece and the lamp pin supported by the contact piece, the contact piece is automatically separated from the lamp pin based on the abnormal heat generation. Since it is possible to prevent the abnormal heat generation from continuing, it is possible to provide a highly safe fluorescent lamp socket that is unlikely to burn due to the abnormal heat generation.

According to the inventions of claims 6 to 9, when abnormal heat generation occurs at the contact portion between the contact piece and the lamp pin supported by the contact piece, it is possible to reliably perform before the socket body burns. Since the tip side contact piece support is melted, there is no risk of burning due to the abnormal heat generation, and a highly safe fluorescent lamp socket can be provided.

According to the tenth aspect of the present invention, since the mounting claws are provided on the rear cover having a simpler structure than the socket body in which the rotor is housed, the die cost of the socket body molding die is reduced. Therefore, it is possible to provide a fluorescent lamp socket that can be reduced in number and is therefore inexpensive.

According to the eleventh aspect of the present invention, the strength of the narrow inner joint portion that closes the inner side of the escape groove provided in the rotor to allow passage of the lamp pin is reduced due to the weld line. Therefore, it is possible to provide a fluorescent lamp socket in which the rotor is less likely to be damaged.

According to the twelfth aspect of the present invention, when handling the rotor in a state where it is integrally connected to the socket body, the rotor is repeatedly shaken and the portion to be cut is cut carelessly. It is possible to provide a fluorescent lamp socket which can be restrained and has good workability when separating the rotor from the socket body.

According to the thirteenth aspect of the present invention, there is a high reliability in mounting the socket mounting portion.
Since the fluorescent lamp socket according to any one of the above is provided, it is possible to provide a lighting fixture capable of preventing the fluorescent lamp socket from being accidentally dropped.

[Brief description of drawings]

FIG. 1 is a perspective view showing a lighting fixture including a fluorescent lamp socket according to a first embodiment of the present invention.

FIG. 2A is a side view showing the fluorescent lamp socket according to the first embodiment. FIG. 3B is a front view showing the fluorescent lamp socket according to the first embodiment. FIG. 3C is a plan view showing the fluorescent lamp socket according to the first embodiment. FIG. 3D is a bottom view showing the fluorescent lamp socket according to the first embodiment.

FIG. 3 is an exploded perspective view of the fluorescent lamp socket of FIG.

4A and 4B are rear views showing the fluorescent lamp socket of FIG. 2 with a rear cover removed in different states.

5A is a vertical cross-sectional side view showing the socket body of the fluorescent lamp socket of FIG. 2. FIG. FIG. 3B is a rear view showing the socket body of the fluorescent lamp socket of FIG. 2.

FIG. 6 is a perspective view showing the rotor included in the fluorescent lamp socket of FIG. 2 as viewed from the back side in an independent state.

7A is a cross-sectional plan view showing the fluorescent lamp socket of FIG. 2 in an exploded state. FIG. 3B is a cross-sectional plan view showing the fluorescent lamp socket of FIG. 2 in an assembled state.

FIG. 8 is a front view showing a fluorescent lamp socket according to a second embodiment of the present invention.

FIG. 9 is a rear view showing a socket body of a fluorescent lamp socket according to a third embodiment of the present invention.

[Explanation of symbols]

11 ... Fluorescent lighting equipment 12a ... End plate of the chassis (socket mounting part) 13 ... Fluorescent lamp socket 14 ... Fluorescent lamp 21 ... Socket body 21a ... Front wall of socket body 21d ... Side wall of socket body 22 ... Rear cover 23 ... rotor 24 ... Contact piece 25 ... Lamp pin insertion hole 28 ... Notch L ... Center line 29 ... Tip side contact piece support 30 ... 1st original side contact piece support 31 ... Second side contact piece support 43 ... Mounting claw 43a ... Root of mounting claw 43b ... Arm part of mounting claw 43c ... Hooking part of arm 55 ... Connecting part of rotor 57 ... Scheduled cutting section 61 ... Electric wire connection part of contact piece 62 ... Lamp pin contact part of contact piece 62a ... Tip of lamp pin contact part

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) // F21W 131: 30 F21S 3/02 C F21Y 103: 00

Claims (13)

[Claims] 1. A synthetic resin socket body having a front wall in which a lamp pin insertion hole is formed, a contact piece support provided on the front wall, and a rear surface opened, and an opening in the rear surface closed. A rear cover made of synthetic resin, which is connected to the socket body and integrally formed with a plurality of mounting claws protruding in the rear direction, and a conductive leaf spring, and is configured to face the lamp pin insertion hole. A fluorescent lamp socket, comprising: a contact piece supported by a contact piece support and housed in the socket body; and a contact piece that holds a lamp pin inserted into the lamp pin insertion hole. 2. The fluorescent lamp socket according to claim 1, wherein the back cover is made of a synthetic resin having a lower flame retardancy than a synthetic resin of which the socket body is made. 3. The mounting claw is formed of a root portion protruding from the peripheral edge of the back cover in the front direction, and an arm portion that is folded back from the root portion in the back direction and has a tip end serving as a hooking portion. The fluorescent lamp socket according to claim 1 or 2, wherein. 4. A cutout having a size corresponding to the root portion is provided on a side wall of the socket body, and an edge of the cutout is overlapped with an outer surface of an edge portion of the root portion. The described fluorescent lamp socket. 5. The contact piece support, which supports the original contact piece support that supports the electric wire connection portion side of the contact piece, and the tip side contact that supports the tip end portion of the contact piece opposite to the electric wire connection portion. In a state in which at least one contact piece of the corresponding contact pieces, which includes a cantilever, is elastically deformed so that its tip end side is closer to the tip end side of the other contact piece, this contact piece is set to the original side. The fluorescent lamp socket according to any one of claims 1 to 4, wherein the fluorescent lamp socket is supported over the contact piece support and the tip side contact piece support. 6. The tip-side contact piece support is formed so as to be more easily melted than the original-side contact piece support.
The fluorescent lamp socket described in. 7. The fluorescent lamp socket according to claim 6, wherein the tip-side contact piece support is smaller than the original-side contact piece support. 8. The fluorescent lamp socket according to claim 6, wherein the tip-side contact piece support has a thickness smaller than that of the front wall. 9. The fluorescence according to claim 6, wherein the tip-side contact piece support is made of a synthetic resin having lower heat resistance than the front wall. Lamp socket. 10. A synthetic resin socket body having a front wall in which a lamp pin insertion hole is formed, a contact piece support provided on the front wall, and a rear surface opened, and an opening in the rear surface being closed. A rear cover made of synthetic resin, which is connected to the socket body and integrally formed with a plurality of mounting claws protruding in the rear direction, and a conductive leaf spring, and is configured to face the lamp pin insertion hole. The contact piece is supported by a contact piece support and is housed in the socket body, and is formed integrally with the socket body through a contact piece that holds a pair of lamp pins inserted into the lamp pin insertion hole and several minute cut portions. Which is separated from the socket body by cutting the portion to be cut and is incorporated in the socket body, and is rotatably arranged between the contact pieces. A fluorescent lamp socket, comprising: a rotor made of synthetic resin. 11. The fluorescent lamp socket according to claim 10, wherein the planned cutting portion is provided at a position asymmetric with respect to a centerline that bisects the socket body in the width direction. 12. The fluorescent lamp socket according to claim 10, wherein the planned cutting portion is provided in three or more places. 13. A chassis having a socket mounting portion having a plurality of claw receiving holes formed therein, and a fluorescent lamp socket according to any one of claims 1 to 12, which is mounted on the socket mounting portion. A luminaire, comprising: a fluorescent lamp detachably supported by the lamp socket.