CN211062930U - Insulator - Google Patents

Abstract

An insulator electrically insulates a contact that can be inserted in an axial direction in the insulator, the insulator having an insulator upper portion that can be connected to an insulator lower portion, the insulator upper portion having a second contact hole corresponding to a first contact hole of the insulator lower portion and a contact opening on an end face side. The lower insulator part, after following each first contact opening, has at least one resilient retaining lug which extends in the axial direction and which is inclined into the first contact opening, engages with the contact in the respective first contact opening when the contact is inserted and is fixed in its correct position in the axial direction in order to prevent slipping out, and after the upper insulator part and the lower insulator part have been completely assembled, the retaining lug blocks the respective second contact opening of the upper insulator part in order to prevent radial opening.

Description

Insulator

Technical Field

The invention relates to an insulator for electrically insulating contacts for electrical plugs, in particular round plugs, which are insertable in the axial direction in the insulator, having an insulator lower part with an opening for the end face side of an electrical line to be connected to the contact and having an axially extending contact hole for supporting the contact, and having an insulator upper part which can be connected to the insulator lower part and has a contact hole corresponding to the contact hole of the insulator lower part and a contact opening on the end face side.

Background

Such insulators are known and are used in use to insulatively retain contacts in the form of plugs or sockets in a plug component, in particular a round plug. A disadvantage of these known insulators is that after separating the lower insulator part from the upper insulator part, the user still has to fit the contacts, then insert these contacts into the lower insulator part and then insert these contacts, which are difficult to center in the radial direction and which easily fall out, into the upper insulator part and connect the upper insulator part and the lower insulator part to one another. Furthermore, the connection of the two insulator parts can only be released again with a tool.

Disclosure of Invention

The invention is therefore based on the object of overcoming the abovementioned disadvantages and of improving such an insulator with regard to operability.

This object is achieved by an insulator. Further advantageous embodiments are found in the dependent claims.

The insulating body according to the invention has an insulating body lower part which, after each first contact hole, has at least one, preferably two, elastic retaining webs extending in the axial direction and inclined into the first contact hole. The retaining tabs are pressed outwardly and engage the contacts when the contacts are inserted into the respective first contact apertures. The retaining tabs may for this purpose comprise inwardly directed retaining noses or other suitable retaining elements on the ends for engaging into the grooves on the contacts and fixing the contacts in their correct position in the axial direction in order to prevent slipping out. After the insulator upper portion and the insulator lower portion are completely assembled, the holding pieces block respective corresponding second contact holes of the insulator upper portion to prevent radial opening. In this way, loss protection of the contact is achieved in any case and the contact is held stably in the first contact hole.

Advantageously, the retaining strip fixes the contact with its end face in the axial direction. According to another advantageous design, this allows the retaining tabs to have a radius corresponding to the radius of the contact. The contacts are therefore additionally centered and oriented on the circumference. The retaining tab preferably has an arcuate thickening at the free end, which thickening can also assume the centering of the contact. This tolerance compensation improves the plug compatibility. For this purpose, preferably two retaining tabs per first contact hole are sufficient. According to a further advantageous embodiment, after complete assembly, the second contact hole in the upper part of the insulating body surrounds the retaining disk and thus prevents an outward radial opening.

This design already improves the operation, since the contact cannot fall out again from the lower part of the insulator in the case of an opened insulator.

In order to further improve the handling, in a further particularly preferred embodiment of the invention, the insulator lower part and the insulator upper part have locking elements arranged in the axial direction, which upon axial assembly of the insulator upper part and the insulator lower part achieve a pre-locking position in which the insulator upper part has not yet been completely assembled with the insulator lower part and a final locking position in which the insulator upper part is completely assembled with the insulator lower part. In combination with the above-mentioned features, this means that in the pre-locking position the locking element has not yet been locked against radial opening and can therefore be pulled out axially substantially under force. However, this embodiment has the particular advantage that the already assembled contact can be inserted from the end side into the contact body in the pre-locking position, so that the insulator parts do not have to be separated from one another but only have to be connected to one another in the pre-locking position in order to provide the insulator together with the assembled contact completely for installation into the plug part. For this purpose, the mounted contact is inserted into the lower part of the insulating body from the end face side and is supported in a floating manner in the corresponding first contact hole, wherein the contact is fixed in the axial direction by the retaining piece after reaching the insertion position in order to prevent slipping out. In the case of a faulty assembly, the correction can still be made without opening the insulator. Subsequently, the insulator component can be placed in a final locking position, in which a positive-locking connection between the insulator upper part and the insulator lower part is achieved by the above-described blocking geometry of the second contact opening in the insulator upper part in combination with the retaining tabs and the locking elements on the insulator upper part and the insulator lower part.

According to a preferred embodiment of the insulator upper part and the insulator lower part, the locking elements are arranged on the circumference of the insulator upper part and the insulator lower part. They are thus accessible from the outside and can be unlocked without tools.

Furthermore, the locking element has two locking projections and locking openings which are arranged at a distance from one another in the axial direction and which are provided for a preliminary locking position and a final locking position. Advantageously, the locking projections are configured as parallel locking strips which can be engaged with corresponding elongated parallel locking openings, wherein preferably the locking strips are mounted on the upper part of the insulator.

In order to provide the user with a clear feedback when the insulator is closed, i.e. when fully assembled, the force to be used for the final locking position is greater than for the pre-locking position. Thus, there is a significant force difference between the pre-lock position and the final lock position. The force required to bring the two insulator components into the pre-lock condition is significantly less than the force required to bring the two insulator components into the final lock condition. This makes it even more unlikely that the insulator part will accidentally be locked due to a sharp increase in the coupling force (force-fitting connection), since there was previously tactile feedback.

The insulating body designed according to the invention allows the assembled contacts to be mounted and dismounted without dismounting the insulating body and without using tools, wherein the contacts inserted into the insulating body snap into the first contact holes and are locked in the pre-locking position in order to prevent them from falling out during mounting and form a positive and non-positive fit connection between the retaining tabs of the insulating body and the housing by inserting the insulating body into the housing of the plug part in the final locking position.

Drawings

The features and feature combinations mentioned above in the description and the features and feature combinations named below in the description of the figures and/or shown in the figures individually can be used not only in the respective given combination but also in other combinations or individually. Not all features need to be implemented in order to implement the invention, but individual features of the independent claims may also be replaced by other disclosed features or combinations of features. All features and/or advantages which are apparent from the claims, the description or the drawings, including design details, spatial arrangements and method steps, are essential for the invention both individually and in various combinations. In the drawings, the same or similar components are denoted by the same or similar reference numerals. In the figures described below, the contacts are shown only for better illustration. The invention itself and the protection relate to the design of the contactless insulator. The attached drawings show that:

fig. 1 is an exploded perspective view of a dielectric body having a lower portion and an upper portion, illustrating a contact in the form of a contact receptacle shown,

figure 2 is a longitudinal section through the component according to figure 1,

figure 3 is a longitudinal section through an insulator with a built-in contact in a pre-lock position,

FIG. 4 is a longitudinal sectional view through the dielectric body with the built-in contact in a final latched position; and

fig. 5 is a top view of the lower portion of the insulator with the retention tabs.

Detailed Description

Fig. 1 shows an insulator upper part 1 and an insulator lower part 2, from which an insulator according to the invention is composed. For the purpose of illustration, an assembled contact 3 (without wires) is also shown, which contact 3 can be inserted from the end face 4 of the lower insulator part 2. The insulator lower part 2 has, at its end facing the insulator upper part 1, two circumferentially arranged and axially extending locking brackets 5 arranged opposite one another, which have two elongate, parallel upper locking openings 6 and lower locking openings 6' extending in the circumferential direction. These locking openings 6, 6 'are intended to engage an upper locking bar 7 and a lower locking bar 7', which are arranged in the recess 21 on the outer circumference of the insulator upper part 1 and extend in the circumferential direction. When the insulator lower part 2 and the insulator upper part 1 are plugged together, the locking bracket 5 enters into the recess 21 on the insulator upper part 1. The contact openings 8 are visible on the top surface of the insulator upper part 1. The contact 3 has a constriction 9 and a thickening 10, which have an important effect on the support of the contact 3 in the insulating body. The contact 3 has an insertion hole 19 for inserting and connecting an electric wire (herein, a general term for a cable, a twisted wire, or the like), and also has a receptacle 18 in this embodiment.

The second contact opening 11 in the upper insulator part 1 can be seen in the sectional view in fig. 2, and the first contact opening 12 for receiving the contact 3 in the lower insulator part 2 can be seen. The thickened portion 10 enters a region 13 in the second contact hole 11, which has a stop 17 that prevents the contact 3 from further axial movement. The second contact hole 11 has an increased diameter portion 14 at its end facing the insulator lower portion 2. The first contact holes 12 in the insulator lower part 2 each have two elastic retaining lugs 15 at their ends facing the insulator upper part 1, which are inclined into the first contact holes 12 and have a thickened portion 16 of circular-arc-shaped configuration at the ends. In the fully assembled insulator, the increased diameter portion 14 overlaps the thickened portion 16 and prevents outward radial movement.

This is shown in fig. 3 and 4. Fig. 3 shows an upper insulator part 1 and a lower insulator part 2, which in the pre-locked state have contacts 3 built into the second contact holes 11 and the first contact holes 12. The lower locking bar 7' is located in the upper locking opening 6 so that the end of the second contact hole 11 in the insulator upper part 1 is located above the retaining piece 15. The contact 3 which can be inserted through the opening 20 in the end face 4 (in this view non-mass-produced and without wires) is located at the desired position in the first contact hole 12 in the lower insulator part 2, and this contact 3 is held by engaging the thickening 16 of the holding piece 15 into the constriction 9. The retaining piece 15 is supported with its end 16 on the end side on the other side of the thickening 10 and prevents the contact 3 from slipping out axially. In fig. 4, the insulator upper part 1 and the insulator lower part 2 are in a final locked state. The upper locking bar 7 is located in the upper locking opening 6 and the lower locking bar 7 'is located in the lower locking opening 6'. The second contact hole 11 of the upper insulator part 1 engages with its region 14 on the upper end of the retaining lug 15 with the thickened portion 16 and thus prevents the retaining lug 15 from moving radially outward.

In fig. 5, the holding plate 15 with its arc-shaped thickening 16 is shown in a plan view.

List of reference numerals

1 upper part of the insulator

2 lower part of the insulator

3 contact

42 end face of

5 locking rack

6. 6' locking opening

7, 7' locking bar

8 contact opening

9 constriction

10 thickened part

11 second contact hole

12 first contact hole

Region 13

14 increased diameter part

15 holding sheet

16 thickened part

17 stop

18 socket

19 into the hole

20 opening

21 concave part

Claims (10)

1. An insulator for electrically insulating contacts (3) insertable in the axial direction in the insulator for electrical plugs, in particular round plugs, having an insulator lower part (2) with an opening (20) for the end face side of a wire to be connected to the contact (3) and with an axially extending first contact hole (12) for supporting the contact (3), and having an insulator upper part (1) connectable to the insulator lower part (2), the insulator upper part (1) having a second contact hole (11) corresponding to the first contact hole (12) of the insulator lower part (2) and a contact opening (8) on the end face side, characterized in that the insulator lower part (2) has, after each first contact hole (12) has been followed, at least one elastic retaining tab (15) extending in the axial direction which is inclined into the first contact hole (12), the retaining tabs engage the contact (3) in the corresponding first contact openings (12) when the contact (3) is inserted and are fixed in their correct position in the axial direction to prevent slipping out, and after the insulator upper part (1) and the insulator lower part (2) have been completely assembled, the retaining tabs (15) block the corresponding second contact openings (11) of the insulator upper part (1) to prevent radial opening.

2. An insulator as claimed in claim 1, characterized in that the at least one retaining tab (15) fixes the contact (3) with its end face (16) in the axial direction.

3. An insulator as claimed in claim 1 or 2, characterized in that the at least one retaining tab (15) has a radius corresponding to the radius of the contact (3).

4. An insulator according to claim 1, characterized in that the second contact hole (11) of the insulator upper part (1) surrounds the retaining tab (15) after complete assembly.

5. An insulator according to claim 1, characterized in that the insulator lower part (2) and the insulator upper part (1) have locking elements (6, 6 '; 7, 7') arranged in the axial direction, which upon axial assembly of the insulator upper part (1) and the insulator lower part (2) achieve a pre-locking position, in which the insulator upper part (1) has not yet been completely assembled with the insulator lower part (2), and a final locking position, in which the insulator upper part (1) is completely assembled with the insulator lower part (2).

6. An insulator according to claim 5, characterized in that the locking elements are arranged on the circumference of the insulator upper part (1) and the insulator lower part (2).

7. An insulator according to claim 6, characterized in that the locking element has two locking projections and locking openings (6, 6') arranged at a distance from each other in the axial direction.

8. An insulator according to claim 7, characterized in that the locking projections are configured as parallel locking strips (7, 7'), which locking strips (7, 7') are engageable with corresponding elongated parallel locking openings (6, 6 ').

9. An insulator according to claim 8, characterized in that the locking strip (7, 7') is arranged on the insulator upper part (1).

10. An insulator according to claim 5, wherein the force to be used for the final locking position is greater than for the pre-locking position.

Images