KR101918182B1 - Led lamp - Google Patents

Abstract

In the present invention, the LED module sheets are directly attached to the outer circumference and the lower portion of the heat dissipating body to direct heat generated from the LED module sheet to the heat dissipating body, and a plurality of vertical heat dissipating openings around the cover member surrounding the light emitting heat dissipating member The present invention relates to an LED bulb capable of improving the heat radiation effect of an LED module sheet by allowing heat generated in the Eldi module sheets to be directly conducted to a heat discharger and then rapidly discharged to the outside through a vertical heat releasing opening, A socket portion having a socket housing having a lower portion opened at a lower portion of the socket, and a control board embedded therein; And a plurality of LED module seats mounted on the outer periphery and the lower periphery of the fixing plate so as to be connected to the control board, An emission heat dissipating member attached at intervals; A cover member that covers the periphery and the lower portion of the light emission / radiation member to transmit light and has a plurality of vertical heat dissipation openings formed around the light emission heat dissipation member; And fixing means for fixing the upper portion of the cover member to the lower portion of the socket housing.

Description

LED light bulb {LED LAMP}

The present invention relates to an LED bulb, and more particularly, to an LED bulb that directly attaches LED module sheets to an outer circumferential portion and a lower portion of a heat dissipating body to directly transmit heat generated from the LED module sheet to a heat emitting body, By forming a plurality of vertical heat dissipation openings around the member, the heat generated from the ELDi module sheets is directly conducted to the heat dissipating body, and is quickly discharged to the outside through the vertical heat dissipating opening, thereby improving the heat radiation effect of the LED module sheet The LED bulb can be turned on.

In general, the LED bulb, which uses an LED as a light source, is very popular as a new illumination light source because of its excellent luminous efficiency, high luminous intensity, high speed response and long life.

In addition, the LED light bulb consumes less power than the incandescent lamp and also has the advantage that it consumes very little.

Hereinafter, an "LED bulb assembly" (hereinafter referred to as "conventional LED bulb assembly") of Korean Patent Laid-Open Publication No. 2012-0123909 will be described as an example of a conventional LED bulb.

A conventional LED bulb assembly includes a socket portion connected to an external power source; A heat sink disposed above the socket; A PCB substrate disposed on the heat sink and having a plurality of LEDs integrated to generate light; And a cover which surrounds the PCB substrate and transmits the LED light. The PCB substrate has a structure vertically installed with respect to the heat sink, and a fixing portion for a substrate is provided between the heat sink and the PCB substrate do.

However, the conventional LED bulb assembly configured as described above has the following problems.

First, the conventional LED bulb assembly has a problem that the lifetime of the LED bulb assembly is shortened because the PCB substrate is installed on the top of the heat sink through the fixing part for the substrate, and the heat radiation effect is reduced.

In addition, the conventional LED bulb assembly has a problem that the appearance of the outside of the bulb is reduced and the merchantability is lowered as the heat sink is exposed to the outside.

Korean Patent Laid-Open Publication No. 2012-0123909 entitled "LED Bulb Assembly" (2012.12.12.)

Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

It is an object of the present invention to provide a heat sink that directly attaches LED module sheets to an outer periphery and a lower portion of a heat dissipator to directly transmit heat generated from the LED module sheet to a heat dissipation member, The heat generated by the Eldi module sheets is conducted to the heat discharging body and then quickly discharged to the outside through the vertical heat releasing opening to thereby improve the heat radiating effect of the LED module sheet have.

Another object of the present invention is to provide an LED bulb which further improves the heat dissipation effect of heat generated in the LED module sheet by further forming the vertical heat dissipating grooves for improving the heat radiation effect around the heat dissipating body .

It is another object of the present invention to provide a heat dissipation structure in which a plurality of heat dissipation holes are further formed around a fixing plate provided on an upper portion of a heat dissipating member, And a plurality of vertical heat dissipation grooves for emitting the heat generated by the control substrate.

Another object of the present invention is to provide a bulb having excellent design of appearance by constituting the cover member by a plurality of circular tubes surrounding the vertical protrusion of the light emitting and heat radiation member, So that the light emitting diode can be easily assembled through only the light emitting diode.

It is another object of the present invention to provide a plasma display panel in which a cover member is constituted by a plurality of circular tubes surrounding a vertical protrusion of a light emitting and radiating member and a plurality of vertical heat dissipation openings The light emitted from the vertical heat dissipation groove of the light emission heat dissipating member can be emitted more quickly to the outside.

According to an aspect of the present invention, there is provided an LED bulb comprising a socket having an upper portion, a socket housing having a lower portion opened at a lower portion thereof, a socket portion having a control board mounted therein, ; And a plurality of LED module seats mounted on the outer periphery and the lower periphery of the fixing plate so as to be connected to the control board, An emission heat dissipating member attached at intervals; A cover member that covers the periphery and the lower portion of the light emission / radiation member to transmit light and has a plurality of vertical heat dissipation openings formed around the light emission heat dissipation member; And fixing means for fixing the upper portion of the cover member to the lower portion of the socket housing.

Further, the light-emitting heat dissipating member of the "LED bulb" according to the present invention is vertically protruded downward at the lower portion of the fixing plate, the lower portion is clogged with the lower plate, a plurality of vertical protrusions are formed around the vertical protrusions A plurality of vertical heat dissipation grooves are formed between the heat dissipation unit and the heat dissipation unit; And a plurality of the LED module sheets attached to the outer surface and the lower surface of each of the vertical protrusions.

The vertical protrusion of the LED bulb according to the present invention includes a vertical heat radiating plate radially protruding radially from the center to the outside, a vertically extending vertical heat dissipating plate, And a lower horizontal plate formed around the lower plate which is a lower portion of the circumferential vertical plate and attached to the lower surface of the LED module sheet.

Further, the cover member of the "LED bulb" according to the present invention includes: a lower cover plate that covers a lower portion of the light emission & A plurality of circular tubes formed at the corresponding positions of the vertical protrusions on the periphery of the lower cover plate so as to protrude upward and formed with vertical grooves on the inside of which the upper portions inserted into the vertical protrusions are opened; A circumferential protrusion formed on the upper portion of the outer periphery of each of the circular tubes so as to be opened inside and integrally connected to each other and protruding outward; And the vertical heat dissipation opening formed vertically between the circular tubes.

Further, the fixing means of the "LED bulb" according to the present invention is a fixing member which is inserted into the upper portion of the cover member from the upper portion and presses each of the peripheral protrusions from the lower portion to the lower portion of the socket housing, .

Further, the fixing member of the "LED lamp" according to the present invention includes: a circumferential plate having a ring-shaped periphery and an upper portion inserted and fixed in an inner lower portion of the socket housing; And a lower plate formed with a cover member through hole into which the cover member is inserted and pressing the peripheral protrusions upward.

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According to the present invention configured as described above, the LED module sheets are directly attached to the outer circumference and the lower portion of the heat dissipating body to directly transmit heat generated from the LED module sheet to the heat dissipating body, The plurality of vertical heat dissipation openings are formed so that the heat generated in the ELDi module sheets is directly conducted to the heat discharging body and is rapidly discharged to the outside through the vertical heat dissipating openings to improve the heat radiation effect of the LED module sheet .

Further, according to the present invention, the heat dissipation effect of the heat generated in the LED module sheet is further improved by forming the vertical heat dissipating grooves for improving the heat dissipation effect around the heat dissipating body.

According to another aspect of the present invention, a plurality of heat dissipating holes are formed around a fixing plate provided on an upper portion of a heat dissipating member, By emitting the heat to the vertical heat dissipating grooves, the effect of releasing heat generated in the control board can be further improved.

In addition, the present invention has an effect of providing an excellent bulb having an excellent appearance by constituting the cover member by a plurality of circular tubes surrounding the vertical protrusion of the light emission / radiation member, and merely a process of slidably inserting the cover member from the bottom to the top So that it is possible to provide an LED bulb having excellent assemblability.

Further, the present invention is characterized in that the cover member is constituted by a plurality of circular tubes surrounding the vertical protrusions of the light emission / radiation member, and a plurality of vertical heat radiation openings are formed between the circular tubes so as to be inserted into the vertical radiation grooves of the light emission / And the heat emitted from the vertical heat dissipation groove of the light emission heat dissipating member can be released to the outside more quickly.

1 is a perspective view of an LED bulb according to the present invention;
2 is an exploded perspective view showing an LED bulb according to the present invention.
3 is a sectional view taken along the line AA in Fig.
4 is a plan view showing a cover member constituting the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 is a perspective view showing an LED bulb according to the present invention, FIG. 2 is an exploded perspective view showing an LED bulb according to the present invention, FIG. 3 is a sectional view taken along line AA in FIG. 1, Fig.

As shown in the drawing, the LED bulb according to the present invention includes a socket portion 1 in which a control board 13 is embedded, a fixing plate 2 horizontally disposed at a lower portion of the socket portion 1, A cover member 4 covering the periphery and the bottom of the light emission heat radiation member 3 and a cover member 4 covering the periphery of the light emission heat radiation member 3, And fixing means (5) fixed to the bottom of the socket housing (12).

The socket unit 1 is screwed to an arm socket provided with a lighting device such as a ceiling, a wall or a stand, and serves to supply electricity to the bulb. A socket 11 is provided at the upper part of the socket unit 1 and a socket housing 12 having a lower opening is provided at a lower portion of the socket 11. The control board 13 is embedded in the socket unit 1 and includes a ballast.

The socket housing 12 includes an insertion tube 121 having an opening at its upper portion and an upper portion at which the socket 11 is installed so that the control unit can be embedded therein, And a housing part 122 formed to be narrow and wide.

An upper heat discharging hole 124 may be further formed in the upper portion of the socket housing 13 to discharge the heat inside the socket to the outside.

The control board 13 may be vertically fixed to the socket housing 12 through the fixing part 14 and the lower end may be fixedly attached to the fixing plate 2. [ The fixing portion 14 is formed on both sides of the inner side of the insertion tube 121 so as to be easily assembled with the control board 13, And an insertion fixing plate 131 inserted into the insertion groove 141b formed on both sides of the fixing protrusion 141a so as to protrude upward from the center of the upper end of the control board 13, ) Is most preferable.

The control board 13 is slidably fixed to the center of the socket portion 1 through the fixing portion 14 so that the control board 13 is moved during the movement of the LED bulb, There is an advantage of preventing the In addition, the present invention is advantageous in that the control board 13 can be easily assembled by slidably fixing the control board 13 to the center of the socket 1, thereby improving the assembling productivity of the bulb.

The fixing plate 2 is disposed horizontally below the socket unit 1 to receive the lower portion of the control board 13 and to fix the light emitting and releasing member 3 to the lower portion thereof.

2 to 4, the light emitting / releasing member 3 constituting the present invention is fixed to a lower portion of the fixing plate 2 so as to protrude downward, To radiate light.

The light emitting and radiating member 3 having such a function is mounted with a plurality of LEDs 341 connected to the control board 13 on the outer circumferential side and the lower circumferential side so as to illuminate illumination light around and below the illumination light, It is preferable that a plurality of LED module sheets 34 are attached with a circumferential spacing.

The light emitting and emitting member 3 includes a heat dissipating member 31 vertically protruded from a lower portion of the fixing plate 2 and an LED module sheet 34 attached to an outer periphery and a lower portion of the heat dissipating member 31 ).

It is preferable that the heat discharging body 31 is made of a metal material such as aluminum having high thermal conductivity so as to enhance the heat radiation effect. A plurality of vertical protrusions 32 are formed around the bottom of the heat dissipating body 31 so that the heat dissipating effect can be enhanced. A plurality of vertical protrusions 32 are formed between the vertical protrusions 32, It is most preferable that the vertical heat dissipation grooves 33 are formed.

The vertical protrusion 32 includes a vertical heat sink 321 protruding radially from the center to the outside in order to enlarge the heat dissipation area, a vertical heat sink 321 formed vertically on the outer side of the vertical heat sink 321, A lower horizontal plate 323 formed around the lower plate which is a lower portion of the circumferential vertical plate 322 and attached to the lower surface of the LED module sheet 34, . The vertical heat dissipating plate 321 is formed to be bent from a plurality of vertical bent portions (not shown) from the inner side to the outer side so that the vertical heat dissipating plate 321 can be further extended to the heat dissipating area.

Each of the LED module sheets 34 is attached to the outer surface and the lower surface of each of the vertical protrusions 32 so that the heat generated from the LED module sheet 34 can be quickly transferred to the heat dissipating body 31 Is most preferable. The LED module sheet 34 is electrically connected to the control board 13 and includes a plurality of LEDs 341 on the outer side and a belt-like shape on the inner surface of which the adhesive is applied. desirable.

Accordingly, the present invention is characterized in that the LED module sheet 34 is directly attached to the outer circumference and the lower portion of the heat dissipating body 31 to directly transmit heat generated from the LED module sheet 34 to the heat dissipating body 31, 31). In addition, the present invention further has the advantage of further improving the heat radiation effect of the heat generated in the LED module sheet 34 by further forming the vertical heat dissipating grooves 33 that widen the heat dissipating area around the heat dissipating body 31 .

1 to 4, the cover member 4 constituting the present invention covers the periphery and the bottom of the light emission heat radiation member 3 to protect the light emission heat radiation member 3, And serves to transmit the emitted light.

The cover member 4 having such a function can be made of a transparent material or a translucent material such as a synthetic resin or glass so as to transmit light, and it is preferable that the cover member 4 is made of a translucent material desirable.

Around the cover member 4, a lower cover plate 41 for covering the lower portion of the light emission heat-radiating member 3 and a lower cover plate 41 for surrounding the lower cover plate 41 A plurality of circular tubes 42 formed to protrude upward at corresponding positions of the protrusions 32 and each having a vertical groove portion opened to the upper portion to be inserted into the vertical protrusions 32; And the vertical heat dissipation opening 44 formed vertically between the first and second heat dissipating units 42 and 42.

The cover member 4 further includes a circumferential protrusion 43 which is open at the upper part of the outer periphery of each of the circular tubes 42 and is integrally connected to each other and protruded outward. It is most preferable that the lower cover plate 41 is formed of a spherical plate whose center is depressed downward so as to diffuse light radiated from the inside to the bottom.

Therefore, the present invention is characterized in that a plurality of vertical heat dissipation openings 44 are inserted between the circular tubes 42 and inserted into the vertical heat dissipation grooves 33 of the light emission heat dissipating member 3, So that the heat emitted from the vertical heat dissipation grooves 33 of the heat dissipating unit 30 is emitted to the outside more quickly.

The present invention can also provide an excellent bulb having an excellent appearance by constituting the cover member 4 with a plurality of circular tubes 42 surrounding the vertical projecting portion 32 of the light emission /

The fixing means 5 constituting the present invention serves to fix the upper portion of the cover member 4 to the lower portion of the socket housing 12, as shown in Figs.

The fixing means 5 having such a function is inserted upward from the lower portion of the cover member 4 and presses the respective peripheral protrusions 43 from the lower portion to the upper portion so as to be inserted into the socket housing 12 It is preferable that the fixing member 51 is fixed.

The fixing member 51 includes a circumferential plate 52 having a ring-shaped periphery and an upper portion to be inserted and fixed in an inner lower portion of the socket housing 12 and a circumferential plate 52 formed at a lower portion of the circumferential plate 52, And a lower plate 53 formed with a cover member through hole 531 through which the cover member 4 is inserted and pressing the peripheral protrusions 43 upward.

A plurality of arc-shaped grooves 531a are formed in the circumference of the cover member through-hole 531 so as to prevent the fixing plate 2 from being exposed to the outside, .

A plurality of heat dissipation holes 521 may be formed in the horizontal direction around the lower circumference of the circumference plate 52 so that the heat generated from the control board 13 may be emitted to the outside more quickly.

An outer latching protrusion 45 is further formed between two or more of the upper portions of the circular pipe 42 around the outer periphery of the cover member 4 and the outer periphery of the upper portion of the lower plate 53 of the fixing member 51 An elastic engaging member 54 may be further formed to engage and fix each of the outer engaging projections 45 with an elastic force in the process of assembling the fixing member 51 from the lower part to the upper part. The cover member 4 is attached to the fixing plate 2 by further fixing the outer locking protrusion 45 formed on the outer periphery of the cover member 4 to the elastic locking member 54 under the fixing plate 2, There is also an advantage in that it is more firmly fixed.

2 and 3, the heat of the control board 13 is communicated with the vertical heat dissipating grooves 33 to surround the vertical heat dissipating grooves 33, A plurality of heat releasing holes 21 may be further formed. Therefore, according to the present invention, a plurality of heat-emitting holes 21 are further formed around the fixing plate 2, so that the heat generated in the control board 13 provided on the fixing plate 2 can be dissipated through the heat- So that the effect of dissipating heat generated in the control board 13 can be further improved by discharging the heat to the plurality of vertical heat dissipating grooves 33 formed in the periphery of the control board 13. [

Hereinafter, the functional relationship of the present invention will be described.

1 to 4, when the LED bulb according to the present invention is assembled, the insertion holes 121b of the socket housing 12 of the socket unit 1 are inserted into the insertion holes 121b of the control board 13 And the control board 13 is assembled by inserting the insertion fixing plate 131.

Next, the fixing plate 2, on which the light-emitting heat radiating member 3 is mounted, is disposed below the socket housing 12. Then, the cover member 4 is inserted into the socket housing 12 from the lower part to the upper part of the light-emitting heat radiating member 3, which protrudes downward from the socket housing 12.

The upper part of the circumferential plate 52 of the fixing member 51 is inserted into the lower jig of the socket 11 after sliding the fixing member 51 through the upper part of the cover member 4 And attaching the LED bulb with an adhesive, thereby completing the assembly of the LED bulb.

Accordingly, the present invention is a useful invention for providing an LED bulb excellent in assemblability by simply assembling the cover member (4) and the fixing member (51) through a process of slidably inserting the cover member (4) and the fixing member (51)

In addition, when electricity is supplied to the bulb of the LED 341 according to the present invention, the LEDs 341 of the LED module sheet 34, which are provided on the outer periphery and the lower portion of the luminous body provided therein, Light is emitted. At this time, each LED module sheet 34 generates heat by the heat generated from the LED 341.

As described above, the heat generated in each of the LED module sheets 34 is conducted to the inside of the heating element to be radiated to the vertical heat-radiating grooves 33 formed around the heating element, and the heat radiated to the vertical heat- Is rapidly discharged to the outside through a plurality of vertical heat radiation openings (44) formed around the cover member (4).

Accordingly, the present invention is characterized in that the LED module sheets 34 are directly attached to the outer circumference and the lower portion of the heat dissipating member 31 to direct heat generated from the LED module sheet 34 to the heat dissipating member 31, The heat generated from the LED module sheets 34 is directly conducted to the heat discharging body 31 and the vertical heat releasing openings 44 are formed around the cover member 4 surrounding the cover 3, And is rapidly discharged to the outside through the heat dissipation opening portion 44.

Therefore, the present invention is a useful invention that can quickly extend the heat generated from the LED module sheet 34 to the outside, thereby improving the heat radiating effect of the LED module sheet 34 and maximizing the lifetime of the LED lamp.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be suitably modified and applied in the same manner. Therefore, the above description does not limit the scope of the invention defined by the limitations of the following claims.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

1: socket portion
11: Socket
12: Socket housing
121: insertion tube, 122: housing part,
123: Top heat sink hole
13: Control board
131: Insertion fixing plate
14:
141a: fixing projection, 141b: insertion groove,
2: Fixed plate
21: Heat dissipation hole
3:
31:
32: vertical protrusion
321: Vertical heat sink, 322: Perpendicular vertical plate, 323: Lower horizontal plate
33: Vertical heat dissipating groove
34: LED module sheet
341: LED
4: Cover member
41: Lower cover plate
42: Circular tube
43:
44: vertical heat dissipation opening
45:
5: Fixing means
51: Fixing member
52: circumference plate
521: heat dissipation hole
53: Lower plate
531: cover member through hole, 531a: arcuate groove
54: Elastic locking member

Claims (14)

A socket unit 1 having a socket 11 on an upper portion thereof and a socket housing 12 having a lower portion opened on a lower portion of the socket 11 and having a control board 13 therein; A fixing plate 2 disposed horizontally below the socket unit 1; A plurality of LED module sheets 34 mounted with a plurality of LEDs 341 connected to the control board 13 are formed on the outer periphery and the lower periphery of the fixing plate 2, An emission heat dissipating member (3) attached at intervals; A cover member 4 covering the periphery and the lower portion of the light emitting and emitting member 3 and transmitting light therethrough and having a plurality of vertical heat dissipation openings 44 formed around the cover member 4; And fixing means (5) for fixing the upper portion of the cover member (4) to the lower portion of the socket housing (12)
The light emission heat-radiating member 3 is vertically protruded downwardly from the lower portion of the fixing plate 2, the lower portion is closed with a lower plate, a plurality of vertical protrusions 32 are formed around the protrusions 32, A plurality of LED module sheets 34 attached to the outer surface and the lower surface of each of the vertical protrusions 32, / RTI >
A plurality of heat emitting holes 21 are formed around the fixing plate 2 to communicate with the vertical heat dissipating grooves 33 to discharge the heat of the control substrate 13 into the vertical heat dissipation grooves 33,
The socket housing 12 includes an insertion tube 121 having an upper opening and a socket 11 at its periphery and an upper portion thereof and a housing part 122 having a narrow upper part and a wider lower part from the lower part of the insertion tube 121 ),
The control board 13 is vertically fixed to the inside of the socket housing 12 through a fixing part 14 and fixed at its lower end to the fixing plate 2,
The fixing part 14 is formed at both sides of the insertion tube 121 so as to protrude inward and has fixing projections 141a on both sides where insertion grooves 141b are formed on the inner side, And an insertion fixing plate 131 protruding upward from an upper center of the fixing protrusion 141a and inserted into an insertion groove 141b formed in the fixing protrusions 141a on both sides.
delete The method according to claim 1,
The vertical protrusion (32)
A vertical heat sink 321 projecting radially from the center to the outside,
A vertical plate 322 vertically formed on an outer side of the vertical heat sink 321 and having an outer side surface to which the LED module sheet 34 is attached,
A lower horizontal plate 323 formed around the lower plate which is a lower portion of the circumferential vertical plate 322 and attached to the lower surface of the LED module sheet 34,
And a light emitting diode (LED).
The method of claim 3,
Wherein the vertical heat sink (321) is formed to bend through a plurality of vertical bent portions from the inside to the outside.
delete The method according to any one of claims 1, 3, and 4,
The cover member (4)
A lower cover plate (41) covering a lower portion of the light emission / radiation member (3);
A plurality of vertical grooves are formed at the corresponding positions of the vertical protrusions 32 on the periphery of the lower cover plate 41 so as to protrude upward and each of the vertical grooves is inserted into the vertical protrusions 32, A circular tube (42);
A circumferential protrusion 43 formed on the outer periphery of each of the circular tubes 42 so as to be opened inside and integrally connected to each other and each protruding outward;
The vertical heat dissipation openings 44 formed vertically between the circular tubes 42;
And a light emitting diode (LED).
The method according to claim 6,
The lower cover plate
And the center of the light bulb is formed as a spherical plate that sinks downward.
The method according to claim 6,
The fixing means (5)
A fixing member 51 inserted upward from a lower portion of the cover member 4 and pressing each of the peripheral protrusions 43 from the lower portion to the lower portion of the socket housing 12,
And a light emitting diode (LED).
9. The method of claim 8,
The fixing member (51)
A circumferential plate 52 formed in a ring shape and having an upper portion inserted and fixed in an inner lower portion of the socket housing 12,
A lower plate 53 formed at a lower portion of the circumferential plate 52 and formed with a cover member through hole 531 through which the cover member 4 is inserted to press the circumferential protrusions 43 upward,
And a light emitting diode (LED).
10. The method of claim 9,
Wherein a plurality of heat dissipating holes (521) are further formed in a horizontal direction around the lower periphery of the circumferential plate (52).
10. The method of claim 9,
Wherein a plurality of arc-shaped grooves (531a) are formed in the periphery of the cover member through-hole (531) so that the outer surface of each of the circular tubes (42) is closely contacted.
12. The method of claim 11,
Outer side locking protrusions 45 are further formed between two or more of the upper portions of the circular tube 42 around the outer periphery of the cover member 4,
An elastic engaging member 54 for fixing each of the outer engaging projections 45 by an elastic force in a process of assembling the fixing member 51 from the lower part to the upper part is provided around the upper part of the lower plate 53 of the fixing member 51 ) Is further formed.
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