CN1248079A

CN1248079A - Telescopic electric terminal box structure and its mounting and connecting method

Info

Publication number: CN1248079A
Application number: CN 98119330
Authority: CN
Inventors: 二村和彦; 高槻梢
Original assignee: Sumitomo Wiring Systems Ltd
Current assignee: Sumitomo Wiring Systems Ltd
Priority date: 1998-09-15
Filing date: 1998-09-15
Publication date: 2000-03-22

Abstract

The electric junction box includes a first part including first unit to hold the first electric terminals, a second unit to hold the second terminals and a casing. The casing has an end wall with the first opening and the second opening in the upper and the lower parts separately. The first unit and the second unit may be shifted between the withdrawn position and the stretching position inside the casing. One second electric junction box includes a notch to hold the first part and a electric contact element on the notch wall and connected electrically to the contact pins of the first and the second terminals.

Description

Telescopic electric terminal box structure and assembling thereof and method of attachment

The present invention relates to a kind of junction box structure that is used for connecting flexible print wiring (FPC) and/or bus rod.Specifically; the present invention relates to a kind of junction box structure; wherein the contact of the binding post in first terminal box part is protected; and be connected and fixed second terminal box part of flexible print wiring (FPC) and/or bus; with before second terminal box part is connected, the contact of binding post can not be exposed to the outside and damage at first.In case after connecting, the contact of binding post exposes, be used for being connected with FPC and/or bus.The invention still further relates to a kind of assembling and the method that is connected first and second electrical junction box part; in this part; the contact of binding post; on retracted position, be protected; and connect with Pressure Welding; perhaps, can with the portable binding post of insulation before connecting electric wire and binding post, insert in first terminal box part.

Ma Suda people's such as (MaSuda) U.S. Patent No. 5230636 has been represented a FPC terminal box.As shown in Figure 7, the terminal box that is used for FPC45 generally includes a sleeve or terminal box 26 and a binding post protection terminal box 35.Because terminal box 35 comprises the resilient contact 40 that is exposed to the outside, therefore, with before FPC45 is connected, owing to contacting with foreign body etc., this resilient contact 40 may be damaged or be out of shape.So, as shown in Figure 3,, on the neighboring of housing 2, be provided with a binding post protection part 5 in order to protect resilient contact 24.Shown in Figure 4 and 5, when inserting this terminal box in the opening 26, this binding post protection part 5 slides, and resilient contact 24 is come out.As a result, resilient contact 24 and binding post 31a can connect mutually.

U.S. Patent No. 5575061 has been announced a kind of portable binding post of insulation, and in the housing of this binding post, electric wire 40 and binding post 38 are connected together by Pressure Welding.Though, all electric wires can be inserted in the corresponding binding post simultaneously, yet, have only the single-stage terminal box could adopt this structure.

Japan publication No.2-24222 has announced a kind of secondary junction box structure, wherein, all is provided with resilient contact 7b on the left side of a public housing 6 and right surface.In housing 6, utilize flexible lance 8, binding post 7 is fixed on the assigned position.In terminal box 5 with before second terminal box 2 is connected, in the resilient contact 7b indentation housing 6.Utilization is located at the convex 10 on the terminal box 2, by lance 8, resilient contact 7b can be pushed away forward.As a result, resilient contact 7b contacts with FPC3.Once a binding post volume can only be bent and/or inserts in the housing.

But U.S. Patent No. 5230636 and No.5575061 only are applicable to the binding post of a level, and the junction box structure requirement of Japan Patent 2-24222 before binding post is inserted housing 6, be connected electric wire 11 with binding post 7.In addition, Japan Patent 2-24222 uses the binding post of wound form, and in this binding post, the insulating barrier of the end of electric wire 11 is gone, and on a bobbin of binding post 7, simultaneously, the insulated part of electric wire 11 is on an insulated column.Because the inlet of housing internal wiring terminal is very little, therefore, after binding post is inserted housing, can not be with the electric wire connection or on binding post.In addition, the expose portion of wound wire 11 needs power, if electric wire is assemblied on the binding post, and binding post is in housing, and this can cause part or housing to damage.

An object of the present invention is to overcome the above-mentioned shortcoming of technology formerly.

Another object of the present invention provides a kind of electric terminal box structure; wherein; a housing comprises two internal elements that separate, and each element memory is put a binding post, can protect the elastic contact blade of those binding posts that can stretch from housing end face and bottom surface.

A further object of the invention provides a kind of structure and method, makes when connection and/or when taking the terminal box part apart, before the bus with FPC and/or second terminal box part contacts, the telescopic contact of first terminal box part is protected.

A further object of the present invention provides the binding post of pressure welded type.After the binding post insertion chamber of first and second unit that separate in the housing is inserted or inserted to binding post in advance, electric wire is pushed in the Pressure Welding access slot of binding post, pressure welded type binding post is connected with electric wire.A pair of upper and lower unit is assembled, just can form a twin-stage terminal box, like this, the contact of first and second or upper and lower binding post can move back and forth between withdrawal and extended position.

According to another object of the present invention or first embodiment, an electric terminal box structure comprises first electrical junction box part, this part comprises first unit that holds at least one first electrical wiring post, and hold second unit of at least one second electrical wiring post and one and hold first and second unit housing, housing with an end wall and upper wall and lower wall comprises first and second opening portions respectively, they and above-mentioned first and second electrical wiring posts linearly arrange, move between retracted position that first and second unit can be in housings and the extended position.When retracted position, in this housing of contact indentation of the above-mentioned first and second electrical wiring posts, and when extended position, the contact of first and second binding posts passes first and second opening portions of this housing and stretches.

This electric terminal box structure can also comprise second electrical junction box part that has the groove that holds first electrical junction box part, electric contact part on the wall of groove and first and second binding post connected with contact, also has the unit separator, it can make first and second unit move to extended position from their retracted position, so that contact contacts the part connection with electric.This unit separator can comprise: (1) interior protruded arm of opening that is placed on the above-mentioned first electrical junction box part; And/or (2) groove on the first electrical junction box part, that hold pin.

In an embodiment, described housing is included in a sidewall of each end of end wall, and each sidewall comprises a groove, wherein accommodates at least one first pin on first unit and one second pin on second unit.Each groove can comprise a pair of convex, before the first and second electrical junction box parts connect, boss flexibly remains on first and second pins on the interior location, when the first and second electrical junction box parts link together, first and second pins, the position through convex, moves to an external position internally.In an embodiment, the above-mentioned first and second electrical wiring posts can comprise the portable binding post of insulation.

According to a further aspect in the invention, a kind of assembling and the method that is connected the first and second electrical junction box parts have been proposed.This method comprises inserts first unit with first insulation binding post at least, with second insulation binding post inserted second unit, this first and second binding post insert this first and second unit in after, the first wire Pressure Welding is connected on first binding post, the second wire Pressure Welding is connected on second binding post, again first and second unit are inserted in the housing, form the first electrical junction box part.This housing comprises first and second opening portions of linearly arranging with this first and second binding post.First and second unit flexibly remain on the retracted position in housing, and the first and second terminal box parts are coupled together, make and the unit separation device of the above-mentioned second terminal box part first and second unit are moved to extended position from retracted position.At extended position, the contact of the first and second electrical wiring posts stretches out by above-mentioned first and second opening portions, connects with the electrical contact elements of the second terminal box part.

Below by detailed description of the preferred embodiment explanation other purpose of the present invention and/or aspect.

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, in the accompanying drawing:

Fig. 1 is the decomposition diagram of first terminal box part of first embodiment according to the invention;

Fig. 2 represents first embodiment according to the invention, before assembling, and first and second terminal box part of binding post under retracted mode;

Fig. 3 represents first embodiment according to the invention, first and second terminal box parts under complete connection status;

Fig. 4 is the decomposition diagram according to the first terminal box part of second embodiment of the present invention;

Fig. 5 represents according to second embodiment of the present invention, under unassembled state, and the first and second terminal box parts of binding post when retracted position;

Fig. 6 represents according to second embodiment of the present invention, the first and second terminal box parts under connection status;

Fig. 7 is according to second example of the present invention, the schematic side elevation of the amplification of the first terminal box part when retracted position;

Fig. 8 is the schematic diagram according to first and second unit of the first terminal box part of first or second embodiment of the present invention;

Fig. 9 is the perspective view of a portable binding post of insulation;

Figure 10 is the end view of the portable binding post of insulation as shown in Figure 9.

The preferred embodiments of the present invention illustrate with reference to Fig. 1～10, wherein, Fig. 1～3 expressions first embodiment of the present invention, Fig. 4～8 expressions, second embodiment of the present invention, the portable binding post of using among Fig. 9 and 10 expressions, first and second embodiment of the present invention of a kind of insulation.

Fig. 1 is the decomposing schematic representation of the first terminal box part 10 of first embodiment according to the invention.The illustrated first terminal box part can be made by for example plastics or other suitable materials.The first terminal box part 10 comprises a housing 12, and housing comprises an end wall 14 that forms an opening 16 again, sidewall 18 on each side of end wall 14 and roof and diapire 20,22.Each wall in roof and the diapire comprises at least one opening portion 24.The roof 20 of housing 12 also comprises a locking arm 26, and first locking member 28, an explanation are in the back arranged on the locking arm 26.Each sidewall 18 of housing comprises at least one groove 30, and each groove 30 comprises first and second convex 30a and 30b at least, and its effect will illustrate below.

The first terminal box part 10 also comprises a top or first unit 32 and a bottom or second unit 34.Each unit in first and

second unit

32,34 includes at least one binding post and inserts chamber 36, and binding post or binding post part 40 with conduction of electric wire 50 are inserted in this chamber.As shown in Figure 1, not occupied at the binding post reception cavity 36 at first 32 centers, unit by binding post, facing to because those binding posts are positioned at the below of the locking arm 26 of housing mouth, can face toward locking arm.Certainly, second unit 34 following is once the binding post reception cavity can comprise that as the binding post in the same quantity as shown in first unit 32 perhaps, all the binding post reception cavities 36 in second or upper unit 34 can be occupied by binding post 40.

Fig. 9 and Figure 10 are the enlarged diagrams of binding post 40.Binding post 40 is that for example, the portable binding post that insulate is made by for example metal or other conductors.Yet the present invention also can use other forms of binding post.As shown in Figure 9, each binding post 40 comprises a contact 42, and it stretches out from first and second unit 32 and 34.In Fig. 9 and 10, electric wire 50 also is not assembled together with binding post 40.Each binding post 40 comprises a Pressure Welding access slot 46a with a knife edge part 44.This knife edge part 44 comprises at least one blade part 46.Thoroughly do away with the edge electric wire when inserting one, when contacting with blade spare 46, electric wire 50 is clipped between the relative blade spare 46 tightly.Simultaneously, this blade spare 46 will be cut and wear insulation, with completely electric contact of foundation with the metal part of electric wire 50.This process is called the pressure welding.Can understand this point well from people's such as Tsuji U.S. Patent No. 5575061.As Fig. 5 at least of Tsuji patent and shown in Figure 6, with the pressure welding, when the binding post part was inserted housing, required pressure or power were less, and this just can not damage housing.Obviously, before binding post 40 inserts in first and second unit, can connect wires 50 by Pressure Welding.Yet big relatively power can be damaged housing, and when binding post was in housing, the wound form binding post can not wind the line.

Or with reference to Fig. 1, in case binding post 40 is inserted in first and

second unit

32 and 34, and after electric wire 50 and the welding of binding post 40 pressure,

unit

32 and 34 can be inserted in the housings 12.Binding post 40 comprises lance 48 (Fig. 3), and it can be locked at binding post 40 on the wall 33 of first and

second unit

32 and 34.

First unit 32 comprises one first pin 32a or a sidewall.Second unit 34 comprises second a pin 34a relative with the first pin 32a.First unit 32 also comprises the 4th pin 34b the 3rd a pin 32b in a straight line with second unit 34.When inserting first and

second unit

32 and 34 in the housings 12, first and second pin 32a and the 34a aim at the groove 30 of the end wall 14 of the most close housing 12, and are inserted in the groove 30.In addition, on the inner surface of sidewall 18, can make the guide groove (not shown), guiding

32a and 34a are so that first and

second unit

32 and 34 insert in the housings 12.Above-mentioned third and

fourth pin

32b and 34b insert in the same way in end wall 14 another groove 30

farthest.Pin

32a and 34a temporarily remain on an interior location 30e place between groove 30 interior elasticity convex 30a and the 30b.Equally, the third and

fourth pin

32b and 34b also remain between convex 30a and the 30b, from an interior location 30e place of end wall 14 groove 30 farthest.On this position, the first terminal box part 10 is resiliently maintained at retracted position, and at this moment, these first and

second unit

32 and 34 in housing 12, remain on withdrawal and protected state with the contact 42 of binding post 40, as shown in Figure 2.

Though shown first and

second unit

32 and 34 comprise third and fourth pin 32b and the 34b respectively,, the third and

fourth pin

32b and 34b do not need to make pin and can be can be at the director element that is free to slide in end wall 14 groove 30 farthest.In addition, in end wall 14 groove 30 farthest, also convex 30a and 30b needn't be set.

As shown in Figure 2, also form a groove 62 on the second terminal box part 60, be used to hold the first terminal box part 10.The upper wall of groove 62 and lower wall comprise at least one electrical contact elements, and it can connect the binding post 40 of above-mentioned first and second unit 32 and 34.For example, have face can comprise a flexible print wiring (FPC) 64 on the groove 62, and the lower surface of groove 62 can comprise a bus 66.Bus 66 can comprise a solder joint 68, is used for the wall 70 of the bus 66 and second terminal box 60 is fixed together.

Generally, groove 62 has identical electrical contact elements, for example two buses, or two FPC.Yet for illustrated purpose, the second terminal box part 60 has been represented FPC and bus among the figure.A bisector L along protruded arm 72 will represent, general FPC and bus do not resemble and combine the diagramatic way.Certainly, the upper surface of groove 62 and lower surface can be provided with FPC, solidus etc.

The second terminal box part 60 also comprises the unit separation structure, for example, a protruded arm 72, it cooperates with the opening 16 of the first terminal box part 10.When inserting protruded arm 72 in the openings 16, between this first and second

terminal boxes part

10 and 60, the tapered distal end of protruded arm 72 is inserted between first and second unit 321 and 34.A sagittate groove 33, the tip of being convenient to insert protruded arm 72 can be made in first and second unit.

Fig. 3 represents a position that connects fully between first and second terminal box part 10 and 60.On this position, protruded arm 72 promotes first and

second unit

32 and 34 by rightabout, the contact 42 of top binding post 40 is connected with flexible print wiring 64, and the contact 42 of bottom binding post 40 contacts with bus 66.The contact 42 of each binding post in the upper and lower binding post 40 passes the roof 20 of housing 12 and the opening 24 on the diapire 22 and stretches out.In addition, the locking element 28 of locking arm 26 is with the locking receiver member (not shown) engagement of making a same shape in the groove 62 of the second terminal box part 60.

In the process in the opening 16 that protruded arm 72 insertions first terminal box of the second terminal box part 60 is zero, above-mentioned first and second pin 32a and the 34a, interior location 30e from the groove 30 of the most close end wall 14 crosses convex 30a and 30b, is headed among the external position 30c and 30d of this groove 30.Suppose

32b and 34b be located at this first and

second unit

32 and 34 on, then

32b and 34b occupy the external position 30c from end wall 14 groove 30 farthest, 30d.

If the first and second

terminal box parts

10 and 60 are taken apart from position shown in Figure 3, the first and second terminal box parts are separated each other, then this first and

second unit

32 and 34 still be retained in extended position.At this moment, the contact 42 of binding post 40 may expose, and is not protected, may be damaged.

Second embodiment shown in Fig. 4～6 provides a kind of method that addresses this problem.The first terminal box part 10 ' similar to the first terminal box part shown in Figure 1 of first embodiment.Yet, with the housing 12 of first embodiment relatively, the transformed sidewall 18 of housing 12 shown in Figure 4 ' have '.For example, end wall 14 ' on do not need an opening, and, for the ease of first and second unit 32 ' and 34 ' insert housing 12 ', be provided with guide channel 31.In case after inserting, this first and second unit 32 ' and 34 ' reach Fig. 5 the position, at this moment, the contact 42 of binding post 40 remains on retracted position.

Fig. 7 be the first terminal box part 10 ' the schematic side elevation of an amplification.Housing 12 ' comprise, for example, four boss 12a are multi-functional beam shape stopper arms.For example, when with pin 32a ', 32b ', 34a ' and 34b ' insertion housing 12 ' guide channel 31 in the time, each beam shape stopper arms 12a, flexibly bending enters among the arm curl seam 12c.When inserting fully, beam shape stopper arms 12a bullet is from curved slot 12c, with the pin elastic locking on its position, to prevent first and second unit 32 ' and 34 ' along guide channel 31 and vertically moving in housing 12 ' outside.

Position as shown in Figure 7, the first terminal box part 10 ' insertion second terminal box part 60 ', and be connection status with it.The second terminal box part 60 ' similar to the second terminal box part 60 shown in first embodiment, part 60 ' in, FPC64 be located at groove 62 ' the upper part on, and bus 66 be located at groove 62 ' lower surface.

As top discuss at Fig. 2, bisector L represent flexible print wiring (FPC) and bus generally not as shown mode combine like that.In addition, groove 62 ' upper surface and lower surface all can install FPC, bus etc.

Yet, a protruded arm 72 the second terminal box part 60 ' do not need resembles in first is implemented, but comprise two gathering sills 61 and 63.Two gathering sills can be used as the unit separation structure and use.When the first and second terminal box parts 10 ' and 60 ' when interconnecting, gathering sill 61 can hold the first pin 32a ', and gathering sill 63 can hold the second pin 34a '.For the ease of engagement, pin 32a ' and 34a ' can do than pin 32b ' and 34b ' length.

When engagement, pin 32a ' and 34a ' make first and second unit 32 ' and 34 ' round about motions under the guiding of gathering

sill

61 and 63, until the contact 42 and the groove 62 of binding post 40 ' FPC64 and till bus 66 meshes.In this sense, second embodiment is identical with first embodiment.Yet, when the first and second terminal box parts are thrown off from position shown in Figure 6, when the first and second terminal box parts are separated each other (Fig. 5), first and second unit 32 ' and 34 ', return back to retracted position with the corresponding contact 42 of binding post 40 because gathering

sill

61 and 63 directing pin 32a ' and 34a ', until first and second unit 32 ' and 34 ', between beam shape stopper arms 12a and relative convex 12b, reach once more till the position shown in Fig. 5 and 7.Yet, guiding have full 32b ' and 34b ' and needn't with gathering

sill

61 and 63 engagements, promptly first and second unit 32 ' with 34 ', can center on pin 32b ' and 34b ' rotation simply.But, the separation of pin 32b ' and 34b ' or slip and unnecessary, because the contact of binding post 40 42 is linearly arranged with this first and second pins 32a ' and 34a ', like this, the motion of contact 42 more directly is by pin 32a ' and 34a ' control, rather than by pin 32b ' and 34b ' control.This situation is shown schematically among Fig. 8.

In addition, when when Fig. 5 or position shown in Figure 7 move to position shown in Figure 6, pilot pin 32a ' is forced to 34a ' and beam shape stopper arms 12a and relative convex 12b engagement at least.When connecting, pin 32a ' and 34a ' quilt lead along gathering

sill

61 and 63, and beam shape stopper arms 12a scratched among the curved slot 12c, and the while, boss 12b bent in the partition curved slot 15 partition 13, and partition curved slot 15 is positioned at the relative position of boss 12b.In case after pin 32a ' and 34a ' passed through between element 12a and 12b, element 12a and 12b deflection were returned, and become the position that it does not have deflection normally.When the first and second terminal box parts 10 ' when throwing off with 60, first and second pin 32a ' and the 34a ' from the outer fix 30e ' of groove, move to the inner side of groove shown in Figure 7 backward.In the return movement process, pin 32a ' contacts with protruding minute 12b with 34a ', makes partition 13 deflections, enters in the partition curved slot 15, till pin passes through.Utilize this method, if even the first and second terminal box parts connect earlier, throw off then, the contact 42 of binding post 40 all can remain on protected state, and, be on the retracted position of housing 12 ' interior.

Though the present invention in conjunction with thinking that preferred embodiment is illustrated at present, should be understood that the present invention is confined to described embodiment or structure.On the contrary, the present invention tries hard to cover the change of respectively showing various kinds and the structure of various equivalences.In addition, though represented the different elements of various various combination of the present invention and structure, but these elements all are exemplary, and other combination and structure (comprise more, still less, or only have only a single embodiment or element) are also all within design of the present invention and scope.

Claims

1. electric terminal box structure, it comprises:

One first electrical junction box part, this part comprises:

First unit that holds at least one first electrical wiring post;

Second unit that holds at least one second electrical wiring post; With

Hold this first and a housing of second unit, have an end wall and upper wall and comprise first and second opening portions of aiming at the first and second electrical wiring posts respectively with the housing of lower wall, first and second unit can be in housings, between retracted position and extended position, move, when retracted position, in the contact indentation housing of the first and second electrical wiring posts, and when extended position, the contact of first and second binding posts, first and second opening portions that pass housing stretch out; With

One second terminal box part, this part comprises:

A groove that holds the first electrical junction box part;

An electrical contact elements that is positioned on the groove walls, and be electrically connected with the contact of first and second binding posts; With

A unit separation structure, it pushes up to extended position, first and second unit so that be connected on making contact and this electrical contact elements being electric from retracted position.

2. electric terminal box structure as claimed in claim 1, it is characterized by, an opening is arranged on the housing end wall of the first electrical junction box part, and the unit separation structure comprises a protruded arm, in the process that the first and second terminal box parts connect, when protruded arm entered this opening, protruded arm pushed up first and second unit to extended position.

3. electric terminal box structure as claimed in claim 1, it is characterized by, housing has a sidewall at each end of its end wall, and each sidewall comprises a groove that holds at least at one first pin on first unit and one second pin on second unit.

4. electric terminal box structure as claimed in claim 3, it is characterized by, each groove comprises pair of projections, this boss is before the first and second electrical junction box parts connect, temporarily first and second pins are remained on the interior location of groove, so that first and second unit remain on retracted position, and when first is connected with second electrical junction box part, first and second pins position internally move to an external position of groove.

5. electric terminal box structure as claimed in claim 4 is characterized by, and described projection section comprises beam shape stopper arms, can prevent to throw off between housing and first and second unit.

6. electric terminal box structure as claimed in claim 4, it is characterized by, described unit separation structure comprises one first gathering sill that guides first pin, one second gathering sill with guiding second pin, its feature is that also when the first and second electrical junction box parts connected, first and second unit motion were to extended position, and when the first and second electrical junction box parts were thrown off, first and second unit motion were to retracted position.

7. electric terminal box structure as claimed in claim 3 is characterized by, and each sidewall comprises a curved slot, and a partition is arranged near each groove, and when first and second unit motion during to extended position, partition folds in the curved slot.

8. connecting structure for electrical equipment as claimed in claim 7, it is characterized by each sidewall comprise guiding logical it first and second pins can be guided to first and second boss, first and second unitary elasticity ground with remain on selectively on extended position and the retracted position.

9. electric terminal box structure as claimed in claim 8 is characterized by, and described boss comprises the stopper arms of beam shape, and it can prevent that described first from travelling longitudinally with the guide channel of second unit along this housing.

10. electric terminal box structure as claimed in claim 3, it also comprises one the 3rd pin that is installed on first unit and is installed in one the 4th pin on second unit that this third and fourth pin is connected with the other groove of described housing.

11. electric terminal box structure as claimed in claim 10 is characterized by, first and second pins are aimed at the contact of the first and second electrical wiring posts, and first and second pins are longer than this third and fourth pin.

12. electrical wiring as claimed in claim 1 closes structure, also comprises an elasticity locking arm that is connected with housing, this locking arm comprises one first locking element again, one second locking element engagement on it and the second electrical junction box part.

13. electric terminal box structure as claimed in claim 1 is characterized by, the first and second electrical wiring posts are the portable binding post of insulation.

14. an electrical junction box part comprises:

First unit that holds at least one first electrical wiring post;

Second unit that holds at least one second electrical wiring post;

One is held first and second unit housing, this has an end wall and upper wall comprises first and second opening portions of aiming at the first and second electrical wiring posts respectively with the housing of lower wall, first and second unit can be in housings, between retracted position and extended position, move, when at retracted position, in the contact indentation housing of the first and second electrical wiring posts, and when at extended position, first and second opening portions that the contact of first and second binding posts passes this housing stretch out.

15. electrical junction box part as claimed in claim 14 is characterized by, described housing comprises an opening that is positioned on its end wall, and this opening can hold a protruded arm, and protruded arm then heads on first and second unit motion to extended position.

16. electrical junction box part as claimed in claim 14, it is characterized by, each end of described housing end wall comprises a sidewall, and each sidewall comprises a groove, holds at least one in the groove at first pin on first unit and second pin on second unit.

17. electrical junction box part as claimed in claim 16, it is characterized by, described each groove comprises pair of projections, can temporarily first and second pins be remained on an interior location, so that first remains on retracted position with second unit, and when first and second unit motion during to extended position, first and second pins position internally move to an external position.

18. electrical junction box part as claimed in claim 17 is characterized by, described boss comprises beam shape stopper arms, can prevent to throw off between housing and first and second unit.

19. electrical junction box part as claimed in claim 16, it is characterized by, described each sidewall comprises a curved slot and one and the adjoining partition of each groove, when first and second unit when retracted position moves, the partition deflection enters in the curved slot.

20. electrical junction box part as claimed in claim 19, it is characterized by, each sidewall comprises a guide channel, it can guide to first and second boss with first and second pins, thereby first and second unitary elasticity ground are also remained on extended position and the retracted position selectively.

21. electrical junction box part as claimed in claim 20 is characterized by, described boss comprises beam shape stopper arms, and it can prevent that first and the gathering sill of second unit along housing from travelling longitudinally.

22. electrical junction box part as claimed in claim 14 also comprises an elasticity locking arm that is connected with housing, described locking arm comprises first locking element with one second locking element engagement on the second terminal box part.

23. electrical junction box part as claimed in claim 14 is characterized by, the described first and second electrical wiring posts are the portable binding post of insulation.

24. one kind is used to assemble and the method that is connected the first and second electrical junction box parts, comprises the following steps:

At least one first insulation binding post is inserted in first unit, and second insulation binding post is inserted in second unit;

After in first and second binding post being inserted first and second unit, the first wire Pressure Welding is connected on first binding post, and the second wire Pressure Welding is connected on second binding post;

First and second unit are inserted in the housing, to form the first electrical junction box part, housing comprises and first and second first and second opening portion that binding post is aimed at that first and second unit flexibly remain on retracted position in housing; With

The first and second terminal box parts are connected, make the unit separation structure of the second terminal box part that first and second unit are moved to extended position from retracted position, when extended position, the contact of first and second electrical wiring post stretches out by first and second opening portions, so as with contact on the electrical contact elements of this second terminal box part is electric.