JPH08190973A - Lamp socket - Google Patents

Abstract

PURPOSE: To provide the inexpensive lamp socket which can absorb the dispersion of the lamp length of a straight pipe type fluorescent lamp to be replaced, and can support the lamp. CONSTITUTION: In the holding type lamp socket 16 supporting a straight type fluorescent lamp 17, each of paired electric conductors 23 housed in socket chassis 21, includes each pin hold piece section 44 and each spring piece section 43 which are stretched in a row, and rotatably supports each rotating operation body 22 through which each lamp pin 18 is inserted between the hold piece sections 44. Each rotating operation body 22 joins each mouthpiece receiving section 36 at one end of each barrel section 35 held by the hold piece sections 44, and comprises each stopper section 37 joined at the other end. Each aforesaid operation body 22 is energized by the lesilient force of each spring piece 43 at all times in the direction that each mouth piece receiving section 36 is projected out of the through hole 29 of each socket chassis 21, and each operation body is housed in the inside of each socket chassis 21 in such a way that it can be moved in the axial direction. By this constitution, each rotating operation body 22 is moved in the axial direction while being accompanied with the elastic deformation of each contact electric conductor 23 for absorbing the dispersion of the lamp length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sandwich type lamp socket for supporting a straight tube fluorescent lamp.

[0002]

2. Description of the Related Art A pinch-type lamp socket has a rotary actuating body and a pair of contact conductors sandwiching the rotary actuating body, which are built in a socket housing composed of a socket body and a socket cover. Some project from the front wall of the socket body, and some do not project,
In any case, generally, the rotary actuating member is capable of rotating only in the circumferential direction and is immovable in the axial direction.

By the way, the lamp length of the straight tube fluorescent lamp, in other words, the dimension between the end faces of the bases attached to both ends of the bulb in the longitudinal direction is specified in JIS,
For example, the lamp length of a 40 W (Watt) straight tube fluorescent lamp is (1198 ± 1.5) mm, and its dimensional tolerance is 1.5 mm.
The same applies to a 20 W straight tube fluorescent lamp. Therefore, the lamp lengths of the 40 W and 20 W straight tube fluorescent lamps have a maximum variation of 3 mm. Also, similarly
Even for 110 W straight tube fluorescent lamps, the appropriate tolerance is specified.

However, as described above, according to the conventional lamp socket in which the rotary actuating body cannot move in the axial direction, the distance between the front walls of the pair of lamp sockets provided facing each other, or the facing distance between the front walls of the lamp sockets facing each other. Since the distance between the front faces of the opposing actuating members protruding from the front walls of the pair of lamp sockets provided is fixed to a constant value, variations in the lamp length due to the tolerance cannot be absorbed.

Therefore, when a straight tube type fluorescent lamp having a long lamp length is combined with the above-mentioned separation dimension which varies depending on the mounting positions of the pair of lamp sockets,
It may not be possible to install this lamp. On the contrary, when a straight-tube fluorescent lamp with a short lamp length is combined, the insertion depth of the lamp pin into the lamp socket is reduced, and the contact between the contact conductor and the lamp pin is reduced. As a result, contact stability is reduced. for that reason,
When external vibration acts, the contact between the contact conductor and the lamp pin may be momentarily separated and the lamp may be turned off.

[0006] Therefore, a technique capable of mounting the straight tube type fluorescent lamp by absorbing the above variation in the lamp length is known from Japanese Utility Model Publication No. 58-32235. The technique described in this publication is shown in FIGS.
As shown in (B), a notch portion 3 to be fitted into the socket mounting base 2 (see FIG. 5C) is provided at the lower end of both sides of the lamp insertion portion 1, and the notch portion 3 is formed wider toward the rear end, and An elastic end portion 5 is provided on a back cover plate 4 that covers the insertion portion 1.

The lamp socket having this structure is shown in FIG.
As indicated by the solid line, the socket mounting base 2 is attached with the elastic end 5 abutting the socket insertion part 1 with the socket insertion part 1 tilted forward. Accordingly, when the straight tube type fluorescent lamp 6 is supported with a long lamp length, as shown in FIG.
As shown by the chain double-dashed line in (C), the lamp insertion portion 1 is raised against the elastic force of the elastic end portion 5 to a position where the front surface thereof is at a right angle to the socket mount 2. It is possible to mount the lamp 6 by displacing it to absorb a long lamp length.

[0008]

However, according to the technique described in the above publication, when the lamp 6 having a long lamp length is mounted, the back cover plate 4 is caused by the rising of the lamp insertion portion 1.
Since the end portion 5 having elasticity is strongly pressed against the socket mounting base 2, when the plate thickness of the socket mounting base 2 is thin, the portion of the base 2 on which the end portion 5 is pressed is likely to be deformed. .

When such deformation occurs, the elastic deformation of the end portion 5 decreases or disappears. Therefore, when the long straight tube fluorescent lamp used for lamp replacement is removed, the lamp insertion portion 1 is removed. It becomes impossible to set a predetermined forward lean state. Therefore, there is a problem that the reliability of continuously absorbing the variation in the lamp length is insufficient.

In addition, in the technique described in the above publication, it is necessary to devise a shape for integrally forming the elastic end portion 5 on the back cover plate 4 of the socket, and the inner surface of the back cover plate 4 is required. The structure of the back cover plate 4 is complicated because a structure for holding the rotary actuator is also required. Along with this, the structure of the mold for molding the back cover plate 4 is complicated, which causes a problem of high cost.

It is an object of the present invention to obtain an inexpensive lamp socket capable of supporting the lamp by absorbing variations in the lamp length of a straight tube fluorescent lamp to be replaced.

[0012]

DISCLOSURE OF THE INVENTION The present invention is premised on a sandwich type lamp socket for supporting a straight tube type fluorescent lamp having bases having two lamp pins projectingly provided at both longitudinal ends of the bulb. To do.

In order to achieve the above object, a socket having a front wall provided with a through hole, and a pin insertion / removal groove communicating with the through hole extending over the front wall and a peripheral wall continuous with the socket. A socket housing including a body and a socket cover that is connected to the socket body by closing the open back surface thereof, and a cap that is inserted into the through hole at one end of a body portion built in the socket housing. A rotary actuating body having a receiving portion connected to the other end, a stopper portion connected to the other end, and a pin passing groove through which the lamp pin passed through the pin inserting / removing groove is passed, extending between the body portion and the base receiving portion. , Which is built in the socket housing and is made of an elastic conductive metal plate, supports the rotary actuation body with the body portion elastically sandwiched, and passes through the pin insertion / removal groove. Elastically contacts the lamp pin A pin pinching piece which, comprising a pair of contact conductors having a Oyobosubane piece an elastic force toward the front wall direction integrally connected to this pin pinching piece,
With the pair of contact conductors, a gap is provided between the stopper portion and the inner surface of the socket cover to allow movement of the rotary operating body in the socket cover direction.
The mouthpiece receiving portion is projected from the through hole to support the rotary operating body.

[0014]

The operation of attaching the straight tube type fluorescent lamp to the lamp socket having the above-described structure is performed by inserting the two lamp pins into the pin inserting / removing groove of the socket body and rotating one of the first lamp pins inserted thereinto. After passing through the pin insertion groove of the body, the fluorescent lamp is rotated 90 ° while elastically deforming the pin sandwiching pieces of the pair of contact conductors through these two lamp pins. Then, the pair of pin pinching pieces elastically pinch the two lamp pins from both sides in the arrangement direction, whereby
A fluorescent lamp is supported by the lamp socket.

By the way, the pair of contact conductors sandwiching the rotary actuating member always biases the rotary actuating member so as to project from the through hole of the socket body by the elastic force of the spring piece. Therefore, the portion of the rotary actuator that protrudes from the through hole is pressed against the end surface of the base of the straight tube fluorescent lamp on which the lamp pin is projecting, and thereby the supported lamp with respect to its axial direction. To stop.

When mounting the lamp, the lamp is rotated so that the protruding length of the rotary actuating member from the through hole of the socket body becomes larger according to the variation in the lamp length when the lamp length is short. When the actuating body moves in the front direction and the lamp length is long, the projecting length of the rotary actuating body from the through hole of the socket body is resisted against the elastic force of the spring piece of the pair of contact conductors. The rotary actuator moves toward the rear surface thereof, in other words, toward the socket cover so that the length becomes short or disappears. This movement toward the cover side is allowed by providing a gap between the rotary actuating body sandwiched by the pair of contact conductors having the spring piece portion and the socket cover.

In this way, since the rotary actuator is moved in the axial direction to absorb the variation in the lamp length, the mounting portion of the lamp socket is not deformed due to the variation absorbing operation, and therefore, the variation in the lamp length can be prevented. The variation absorption performance is not impaired.

Further, due to the above-described variation absorption operation of the lamp length, the positional relationship between the lamp pin and the pin sandwiching portion of the contact conductor, in other words, the contact state is always constant, so that the lamp length is short. Whether the lamp is a long lamp or a long lamp, the contact reliability between the lamp pin and the contact conductor is not deteriorated, and a predetermined contact state can be maintained to prevent the lamp from being extinguished regardless of vibration applied from the outside.

Moreover, since the variation in the lamp length is absorbed as described above, it is not necessary to form an elastically deformable end portion for tilting the entire socket forward, and a pair of contact conductors are provided. Since the rotary actuator is supported by utilizing the above, it is not necessary to support the rotary actuator on the socket cover. Therefore, the structure of the socket cover is simple, and accordingly, the mold for molding this cover can be simplified.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view showing a structure of a ceiling-mounted lighting fixture including a lamp socket according to an embodiment of the present invention. In FIG. 1, reference numeral 11 denotes an elongated box-shaped fixture main body with an open lower surface. Yes, this is mounted on the ceiling etc. Socket mounting bases 12 are attached to both ends of the main body 11 in the longitudinal direction, and a terminal base 13 and a lighting device 14 such as a discharge lamp ballast are disposed between the mounting bases 12. And are installed. These internal parts of the device are electrically connected to each other via a lead wire (not shown).

A reflector 15 is attached to the instrument body 11 to cover the open lower surface thereof. Socket reflection holes 15a are provided at both ends of the reflection plate 15 in the longitudinal direction so as to face the socket mounts 12, respectively.

The lamp sockets 16 according to this embodiment are mounted on the socket mounts 12, respectively. These sockets 16 are of a sandwich type as will be described later, and are arranged through the socket through holes 15a, and the instrument main body 11
A straight tube type fluorescent lamp 17 is detachably supported outside the. A fluorescent lamp 17 supported between a pair of lamp sockets 16 facing each other is disposed directly below the reflector 15 so as to face each other. Fluorescent lamp 17 as shown in FIG.
Has a structure in which bases 19 provided with two lamp pins 18 (only one of which is shown) are provided at both ends of the bulb 20 in the longitudinal direction. The two lamp pins 18 are the bulb 2
It is provided so as to be juxtaposed in the diameter direction of 0.

As shown in FIGS. 2 to 4, the lamp socket 16 comprises a socket housing 21 made of synthetic resin, a rotary actuator 22 made of synthetic resin, and a pair of elastic conductive metal plates. And a contact conductor 23.

The socket housing 21 has a flat plate shape with the socket body 24 having an open rear surface, and the socket body 2 has a flat plate shape.
4 has a socket cover 25 which is connected by closing the opened back surface. 2 to 4, reference numeral 26 denotes a locking groove formed on the inner surface of the peripheral wall 24a of the socket body 24, and 27
Is a locking claw protrudingly provided on the inner surface of the peripheral portion of the socket cover 25, and by engaging these, the socket body 24 and the socket cover 25 are connected, and the socket housing 21 is assembled.

Mounting grooves 28 extending along the thickness direction of the housing 21 are formed on the outer surfaces of both sides of the peripheral wall of the socket 21. The mounting groove 28 is fitted into a hole edge of a socket mounting hole (not shown) of the socket mounting base 12, and by this fitting, the lamp socket 16 is positioned and mounted in the socket mounting base 12. Has become.

The front wall 24b of the socket body 24, which is connected to the peripheral wall 24a at a right angle, is located on the side opposite to the side where the mounting groove 28 is provided, in other words, on the tip side of the lamp socket 16, and has a circular shape. A hole 29 is provided.
The diameter of the through hole 29 is smaller than the diameter of the base 19.
Further, in the socket body 24, a pin insertion / removal groove 30 that communicates with the through hole 29 and the peripheral wall 2 that is continuous with the front wall 24b.
4a and the like. As shown in FIG. 3, the pin insertion / removal groove 30 extends in the thickness direction of the socket body 24, and has a narrower width on the outer surface side of the peripheral wall 24a so that the lamp pin 18 can be easily introduced. The width is gradually reduced as it is placed inside the body 24.

As shown in FIG. 4, the socket body 24
The partition base wall 31 which is located at the end portion on the mounting side where the mounting groove 28 is provided and which extends between the inner surfaces of both side portions of the peripheral wall 24a. The partition wall 32 is integrally provided. The partition wall 32 and the both sides of the peripheral wall 24a are provided with grooves 33 as conductor mounting portions facing each other. These grooves 33 extend in the thickness direction of the socket body 24.

As shown in FIGS. 2 and 3, the rotary actuating member 22 is integrally provided with a base receiving portion 36 at one end of a cylindrical body portion 35 having a short length, and a stopper portion 3 at the other end.
7 is provided, and a pin insertion groove 38 extending to the body portion 35 and the base receiving portion 36 is provided.

The body portion 35 has the same diameter as the distance between the center lines of the pair of lamp pins 18. The mouthpiece receiving portion 36 having a diameter larger than that of the body portion 35 is provided with a flange portion 36b having a diameter larger than that of the through hole 29 at a rear end of the main portion 36a passing through the through hole 29, and a peripheral portion of the main portion 36a. Has a spherical shape in order to facilitate the axial movement of the rotary operating body 22 due to the contact with the base 19 when mounting the fluorescent lamp 17. The body portion 35 is concentrically connected to the rear surface of the mouthpiece receiving portion 36. The stopper portion 37 has a larger diameter than the body portion 35, for example, the same diameter as the flange portion 36b. The pin insertion groove 38 having a width through which the lamp pin 18 can be inserted is a slit-shaped notch groove provided along the diametrical direction of the rotary actuator 29, and is formed on the peripheral surface 2 of the body portion 35.
It is open to the front and the peripheral surface of the location and the base receiving portion 36, respectively.

As shown in FIGS. 2 to 4, the pair of contact conductors 23 are composed of a mounting base 41, a locking piece 42, a spring piece portion 43, and a pin sandwiching piece portion 44.

More specifically, the mounting base 41 has a flat plate shape, and both side edges of the mounting base 41 are inserted into and fixed to the grooves 33 facing each other with a slight press fit. As a result, the contact conductor 23 is built in the socket housing 21. Incidentally, 34 in FIG. 2 and FIG.
Is a pressing projection integrally formed on the inner surface of the socket cover 25, and its tip abuts the contact conductor 23, so that the contact conductor 23 does not move from the predetermined insertion position in the groove 33. It is prevented from coming off.

The locking piece 42 comprises a base portion bent at a right angle from one end on the insertion side of the mounting base 41, and a locking piece portion folded back obliquely so that the tip of the base portion gradually approaches the mounting base 41. A lead wire passage hole 42a is provided in the base portion.

On the front wall 24b of the socket body 24,
As shown in FIG. 3, a lead wire introducing hole 45 facing the lead wire through hole 42a is provided. These holes 45,
The core wire of a lead wire (not shown) which is sequentially inserted through 42a is sandwiched between the lock wire and the mounting base 41 by the elastic force of the locking portion, and mechanical and electrical connection between the lead wire and the contact conductor 23 is achieved. The connection is made.

The elastic force of the spring piece portion 43 is equal to that of the front wall 24.
It is a portion that is bent at a right angle from the other end of the mounting base 41 so as to act in the b direction. The pressing convex portion 34 is brought into contact with the bent base portion of the spring piece portion 43.

The pin pinching piece portion 44 is bent from the tip end portion of the spring piece portion 43, is connected to the spring piece portion 43 by changing its direction by 90 °, and is extended in the extending direction of the spring piece portion 43. ing. The pin pinching piece portion 44 has a width slightly shorter than the length of the body portion 35, and has a curved portion 44a (see FIG. 4) along the peripheral surface of the body portion 35 on the extending tip end side thereof. ing.

A pair of pin sandwiching pieces 44 having such a structure
Makes the curved portion 44a elastically contact the body portion 35 of the rotary operating body 22, and sandwiches the body portion 35 from both sides in the radial direction to support the rotary operating body 22 rotatably in the circumferential direction. . In this way, the rotary actuator 22 supported by the pair of contact conductors 23 is in an unloaded state, in other words, in a state in which the fluorescent lamp 17 is not supported, the elastic force of the spring piece portion 43 causes the base receiving portion 36 to move. The main portion 36a is provided so as to protrude from the through hole 29 of the socket body 24 to the outside.

When the lamp 17 is not supported,
By the elastic force of the spring piece portion 43, the cap receiving portion 3 is attached to the hole edge of the through hole 29.
The flange 36b of No. 6 is pressed, and a gap G is formed between the rear end of the rotary operating body 22 and the inner surface of the socket cover 25 to allow the rotary operating body 22 to move toward the socket cover 25.
(See FIG. 2).

The maximum protrusion width A of the main portion 36a when the lamp 17 is not supported is the maximum absorption dimension of the variation in the lamp length of the lamp 17, and when the lamp 18 is 40W. Is determined to be not less than the dimensional tolerance of the lamp length, preferably (1.5 to 2.0) mm. Therefore, the gap G is determined in the same manner, but it is desirable that the gap G be larger than the maximum protrusion width A with a margin.

The pair of lamp sockets 1 having the above structure
6 is a front wall 24 of a pair of lamp sockets 16 facing each other in the mounting on the socket mounting base 12 described above.
The front surface (front surface) of the rotary actuator 22 that is protruded to the maximum from b
The separation distance B between them is the minimum value of the lamp length (for example, 40 W
In the case of the fluorescent lamp 17, the maximum tolerance is 1.5 mm for 1198 mm.
), And position them so that they are the same.

In order to assemble the lamp socket 16 having the above-described structure, first, the pin sandwiching piece 4 of the pair of contact conductors 23 is formed.
The body 35 of the rotary actuator 22 is sandwiched between the four, and both contact conductors 23 are assembled in the socket body 24 in this state. This assembling is carried out by inserting both side edges of the mounting base 41 of the contact conductor 23 into the grooves 33 facing each other, and at that time, the contact conductor tool 23 is locked by the locking piece 42 and the clamped rotation piece 42. The operation is performed with the mouthpiece receiving portion 36 of the actuating body 22 on the leading side.

In this way, by incorporating the rotary actuating body 22 in the socket body 24 together with the pair of contact conductors 23, the mouthpiece receiving portion 36 of the rotary actuating body 22 is moved to the spring piece portion 4.
The elastic force of 3 causes the maximum protrusion width A to pass through the through hole 29 of the socket body 24 to be projected to the outside, and the lead wire through hole 42a of the locking piece 42 is close to the lead wire introducing hole 45 of the front wall 24b. And are arranged facing each other.

Next, the rear surface of the socket body 24 is covered with the socket cover 25, and these are covered with the locking groove 26 and the locking claw 2.
It connects by engaging with 7. Then, the socket housing 21 is assembled, and the pair of pressing projections 34 of the socket cover 25 are connected to each other by the spring piece portion 43 of the contact conductor 23.
The contact conductors 23 are fixed by abutting on the roots of the respective. That is, the assembling of the lamp socket 16 is completed as described above.

In order to support the straight tube type fluorescent lamp 17 in the lamp socket 16 having the above-mentioned structure attached to the instrument body 11, first, the fluorescent lamp 17 is attached to the base 1 thereof.
9 has a pair of lamp pins 18 arranged in parallel in the up-down direction, and these pins 18 are attached to both lamp sockets 1.
6 through the pin insertion / removal groove 30.

Then, the one lamp pin 18 that has passed through the pin insertion / removal groove 30 first is passed through the pin insertion groove 38 of the rotary operating member 22 facing the pin insertion / removal groove 30, and the other lamp pin 18 Is also introduced into the pin insertion groove 18. As a result, the pair of lamp pins 18 are respectively arranged at both ends of the pin insertion groove 38, and the half peripheral portions thereof are respectively projected onto the outer peripheral surface of the base receiving portion 36.

Next, the fluorescent lamp 17 is turned off from this state.
Rotate by °. Then, at the same time, since the rotary operating body 22 is similarly rotated through the engagement with the pair of lamp pins 18, the pin sandwiching of the contact conductive body 23 elastically sandwiching the body portion 35 of the rotary operating body 22 is performed. The lamp pin 18 is further elastically deformed in the piece portion 44, and the piece 44 is brought into close contact with the pin sandwiching piece portion 44. Accordingly, the pair of pin pinching pieces 44 elastically pinch the pair of lamp pins 18 from both sides in the arrangement direction, so that the fluorescent lamp 17 is supported by the pair of lamp sockets 16 facing each other.

According to the structure of the lamp socket 16 having the above-described structure, the rotary operating body 22 is projected from the through hole 29 of the socket body 24 by the elastic force of the spring piece portions 43 of the pair of contact conductors 23. Always energized. Therefore, the main portion 36a of the base receiving portion 36 protruding from the through hole 29 of the rotary actuating body 22 is provided with the base 1 of the straight tube fluorescent lamp 17.
The lamp pin 18 of 9 is brought into contact with the projecting end surface. Therefore, the fluorescent lamp 17 in the supported state can be stopped in the axial direction and the lamp 17 can be stably supported.

Then, in the above-described lamp mounting operation for the lamp socket 16 having the above-mentioned structure, the lamp socket 16 can absorb variations in the lamp length. That is, the pair of contact conductors 23 sandwiching the rotary actuator 22.
With the elastic deformation of the spring piece portion 43 of the
Can move in its axial direction.

Therefore, when the fluorescent lamp 17 having a short length is attached, the elastic force of the spring piece portion 43 causes
The rotary operating body 22 is moved in the front direction so that the protruding length of the socket body 24 from the through hole 29 is increased.

When the fluorescent lamp 17 having a long length is attached, the base 19 of the lamp 17 contacts the base receiving portion 36 and the rotary actuating body 22 is attached to the socket cover 25.
By pushing in the direction, the through hole 29 of the socket body 24 is resisted against the elastic force of the spring piece portions 43 of the pair of contact conductors 23.
The rotary actuator 22 is moved to the socket cover 25 side so that the protruding length from the socket is short or disappears. The movement at this time is allowed by providing a gap G between the rotary operating body 22 and the socket cover 25 which are sandwiched by the pair of contact conductors 23.

As described above, since the rotary actuator 22 can be moved in its axial direction to absorb the variation in the lamp length,
With this absorbing operation, the mounting portion of the lamp socket 16 will not be deformed. Therefore, the lamp length variation absorption performance is not impaired. Therefore, regardless of the variation in the lamp length of the fluorescent lamp 17 to be replaced,
The variation absorption performance can be continuously maintained.

Further, due to the operation of absorbing the variation in the lamp length, the position of the lamp pin 18 and the pin gripping piece portion 44 of the contact conductor 23 regardless of whether the fluorescent lamp 17 to be replaced has a short or long lamp length. The relationship, in other words, the contact state (the contact length of the lamp pin 18 with respect to the pin pinching piece portion 44) can always be made constant. In this way, the contact reliability between the lamp pin 18 and the contact conductor 23 is not deteriorated, and the predetermined contact state can be maintained, so that the contact is momentarily interrupted regardless of the vibration applied from the outside in the lamp supporting state. It is possible to eliminate the fear that 17 is turned off.

Moreover, since the variation in the lamp length is absorbed as described above, it is not necessary to form an elastically deformable end portion for tilting the entire socket forward in the socket cover 25 as in the conventional case. At the same time, since the rotary actuating body 22 is supported by using the pair of contact conductors 23, it is not necessary to support the rotary actuating body 22 on the socket cover 25. Therefore, since the structure of the socket cover 25 is simpler than that of the conventional one, the mold for molding the cover 25 can be simplified, and accordingly, the socket cover 25 can be formed.
Therefore, the cost of the entire lamp socket 16 can be reduced.

The present invention is not limited to the above-described embodiment, but a plurality of pairs of contact conductors sandwiching a rotary actuating body are incorporated in the socket housing, for example, lighting equipment for two lights. It can also be applied to a lamp socket suitable for.

[0054]

As described in detail above, in the lamp socket of the present invention, the rotary actuating member supported by being sandwiched between the pair of contact conductors is moved in the axial direction with elastic deformation of the contact conductors. Since it is a sandwich type lamp socket that absorbs variations in lamp length, the contact reliability between the lamp pin and the contact conductor is guaranteed regardless of whether the straight tube fluorescent lamp is short or long. Can be supported,
Since the mounting portion of the lamp socket is not deformed in the lamp length variation absorbing operation, the lamp length variation absorbing performance can be continuously maintained regardless of lamp replacement. Further, as a configuration for absorbing the variation in the lamp length, it is not necessary to provide the socket cover with an elastically deformable end portion for inclining the entire socket forward, and in addition, a configuration for supporting the rotary actuator is provided. It is not necessary to provide it on the socket cover, and the structure of this cover and the mold for molding it can be simplified, whereby the socket cover can be obtained at a low cost and an inexpensive lamp socket can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a lighting fixture including a lamp socket according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a structure of a lamp socket according to the embodiment together with a part of a fluorescent lamp supported by the lamp socket.

FIG. 3 is an exploded perspective view showing a structure of a lamp socket according to the embodiment.

FIG. 4 is an exploded perspective view showing a mounting structure of a contact conductor in the lamp socket according to the embodiment.

FIG. 5A is a side view showing a configuration of a lamp socket according to a conventional example. FIG. 6B is a rear view showing the configuration of the lamp socket according to the conventional example. (C) A side view showing a state in which a lamp is attached to a lamp socket according to the conventional example.

[Explanation of symbols]

 Reference numeral 16 ... Lamp socket, 17 ... Fluorescent lamp, 18 ... Lamp pin, 19 ... Base, 20 ... Bulb, 21 ... Socket housing, 22 ... Rotating actuator, 23 ... Contact conductor, 24 ... Socket body, 24a ... Peripheral wall, 24b ... Front wall, 25 ... Socket cover, 29 ... Through hole, 30 ... Pin insertion / removal groove, 35 ... Body part, 36 ... Mouth receiving part, 37 ... Stopper part, 38 ... Pin passing groove, 43 ... Spring piece part, 44 ... Pin sandwiching part, G ... Gap.

Claims (1)

[Claims] Claim: What is claimed is: 1. A sandwich type lamp socket for supporting a straight tube type fluorescent lamp having bases having two lamp pins projectingly provided at both ends in a longitudinal direction of a bulb, wherein a through hole is provided in a front wall. Further, the socket body is provided with a pin insertion / removal groove communicating with the through hole extending over the front wall and a peripheral wall continuous with the front wall, and a socket cover connected to the socket body by closing the open back surface thereof. And a socket receiving part that is passed through the through hole, is connected to one end of a body part that is built in the socket housing, a stopper part is connected to the other end, and the socket is passed through the pin insertion / removal groove. A rotary actuation body having a pin insertion groove through which the lamp pin is inserted, extending over the body portion and the cap receiving portion; and a conductive metal plate built in the socket housing and having elasticity. The torso And a pin pinching piece portion that elastically contacts the lamp pin that has passed through the pin inserting / removing groove and that supports the rotary operating body by elastically pinching the pin, and is integrally connected to the pin pinching piece portion in the front wall direction. A pair of contact conductors each having a spring piece that exerts an elastic force toward the socket cover, and the pair of contact conductors between the stopper portion and the inner surface of the socket cover in the socket cover direction. In addition to providing a gap that allows movement of the rotary actuator,
The lamp socket, wherein the base receiving portion is projected from the through hole to support the rotary operating body.