JPH0340004Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a plug-in connection device that serves as a relay for power supply from a drawer-type control unit housed in a control center or the like to a load.

[Conventional technology]

A conventional plug-in connection device of this type has a pair of contact legs into which the blade of the fixed terminal block is inserted, and the contact, to which the electric wire connected to the equipment is screwed, is swung into an insulating case. The blade is housed and held in a freely rotatable so-called floating state, so that slight positional deviation between the contact and the blade can be absorbed to prevent poor contact between the contact and the blade.

[Problem that the invention attempts to solve]

In conventional bayonet connections as described above, when the contact is tilted to either side to the maximum of its floating range before being bayonet connected to the blade,
A gap was created between the tip of the contact leg on the opposite side to the inclined side and the inner wall of the insulating case.

If the plug-in connection device and the blade are inserted with a misalignment on the side opposite to the inclined side, the blade may deviate into the gap, resulting in poor contact or damage to the contactor or insulating case. There was a problem that it could lead to

This invention was made to solve this problem, and provides a highly reliable plug-in connection device that does not cause any trouble in inserting the blade even if the contact is tilted to the maximum floating range. The purpose is to

[Means for solving problems]

The plug-in connection device according to this invention has a flat part where plate members are overlapped and electric wires are welded and connected, and each of the overlapped plate members extends from the flat part with a predetermined gap. a contactor having a tip portion bent and expanded outward, and a slit provided in the center from the bent and expanded tip to the flat portion, and a contact leg portion for holding a terminal blade; is formed to have a thickness smaller than the width of the contact leg, and protrudes from the end of the contact leg on the flat side to a position corresponding to the tip of the contact leg, facing the upper and lower inner walls, and the contact At the distal ends of the legs, each is formed with an outwardly expanding slope and has an insulating casing with a central barrier inserted at least partially into the slits of the contact legs.

[Effect]

In this invention, the gap between the upper and lower inner walls of the insulating case and the tip of the contact leg is closed by a central barrier that loosely fits into the slit of the contact leg, thereby preventing the blade from entering the gap.

〔Example〕

FIG. 1 is a partially cutaway plan view showing an embodiment of this invention. In the figure, reference numeral 100 indicates the entire plug-in connection device, and reference numerals 1 and 2 indicate upper and lower insulating cases which are divided into upper and lower halves and whose interiors are almost symmetrical. 22 is the side wall of the lower insulating case 2, 22A,
Reference numeral 22B denotes walls that are provided inside the lower insulating case 2 at predetermined intervals and parallel to the side wall 22. The upper insulating case 1 is also provided with similar side walls and walls, and when the upper and lower insulating cases 1 and 2 are fitted together, the side walls and walls are brought together at their wall surfaces. Therefore, the height of the side walls and walls of the mating insulating cases 1 and 2 is
It has reached near the bottom of. Further, since the fitting is performed in a labyrinth shape, the side walls 22 of the upper and lower insulating cases 1 and 2 and the opposing wall surfaces of the walls 22A and 22B are in a labyrinth shape. When the upper and lower insulation cases 1 and 2 are fitted together, the side wall 22
Grooves 21 and 21A having a U-shaped cross section and whose upper surfaces are covered by the top plate of the upper insulating case 1 are formed between the wall 22A and the groove 21, and an interphase groove 23 is also formed between the groove 21 and the groove 21A. Become. 31 and 31A are the positions where the front and back plates of the upper and lower insulating cases 1 and 2 face each other, and are provided at positions corresponding to the interphase groove 23 and on the blade insertion side (right side in the drawing). This is an interphase slot for increasing the creepage insulation distance between the contacts 4.

Next, the grooves 21 and 2 formed as described above.
The internal structure of 1A will be explained. In FIG. 1, reference numerals 24 and 24A are locking projections that protrude from the side wall 22 and wall 22A of the lower insulating case 2 to face each other into the groove portion 21. 25, 25A are locking protrusions 2 on both sides of the locking protrusions 24, 24A.
This is a positioning protrusion that is integrally formed with 4 and 24A. As shown in FIG. 2, which is a cross-sectional view of FIG.
is provided in the longitudinal direction, and its height is lower than the middle of the height of the groove portion 21. Further, the insulating case 1 on the upper side facing the positioning projection 25 is also provided with a positioning projection 15 having a similar shape and having a gap approximately in the middle thereof into which the locking projection 24 is fitted.

Reference numeral 26 in FIG. 1 is a central barrier that stands up on the bottom surface of the lower insulating case 2, and is located on the right side of the groove 21 in the drawing. As shown in FIG. 2, the side surfaces of the central barrier 26 include a rectangular piece-like portion, a restricting projection 28 projecting upward at the rear end, and a groove portion 21.
It is integrally formed with an inclined portion 27 protruding outward from the outer end of the. Also, the upper insulation case 1
A central barrier 16 having a limiting protrusion 18 and an inclined portion 17 of the same shape at both ends is provided opposite to the central barrier 26 .

Next, 29 and 29A shown in FIG. 1 are L-shaped wire holding barriers with one end fixed to the side wall 22 and wall 22A of the lower insulating case 2, and as shown in FIG. A wire retention barrier 19 is provided on the side walls 22 and 22A of the upper insulating case 1,
Further, the upper end surfaces of the wire holding barriers 29, 29A and the lower end surfaces of the wire holding barrier 19, (the portion corresponding to 19A is not shown) are in close contact to form a passage for the wire 6.

The contact 4 and the electric wire 6 are attached inside the groove 21 formed in this way.

The contactor 4 has a rectangular piece shape when viewed from above, as shown in FIG.
It is divided, and notched recesses 45 and 45A are provided on both sides of the other end. As shown in FIG. 2, the side surface is formed with a flat part 41, which then widens at an inclination of about 30 degrees, and then extends from the middle with a contact leg part 43 that narrows at an inclination of about 10 degrees. An introduction part 44 that spreads out in an arc shape from the end of the groove 21
It is made up of. Then, the contacts 4, 4 are assembled facing each other, and as shown in FIG. 1,2
By attaching a mounting screw (not shown) to the mounting hole 30 passing through the two, they are fixed to each other and also to a case side plate of the control unit.
In this way, the insulation cases 1 and 2 are connected to the contacts 4 and 4.
When these are housed and assembled, the locking protrusions 24, 24A fit into the recesses 45, 45A with a predetermined gap, and at the same time, the edges of the recesses 45, 45A are aligned with the positioning protrusions 25, 25A and 15, 15A. They are sandwiched with a predetermined gap in between. Further, the central barriers 26, 16 are fitted into the slits 42, 42 provided over the entire length of the contact leg 43 with a predetermined gap, respectively. Further, the flat portions 41, 41 near the roots of the contact legs 43 are sandwiched between the limiting protrusions 28, 18 of the central barriers 26, 16 with a predetermined gap therebetween. This predetermined gap is between the edges of the recesses 45 and 45A and the positioning protrusions 25 and 1.
The gap is set larger than the gap provided between 5 and 5.

The contacts 4, 4 in this state are prevented from coming off from the insulating cases 1, 2 because the recesses 45, 45A are loosely fitted into the locking protrusions 24, 24A, and the contacts 4, 4 are prevented from being detached from the insulating cases 1, 2 by using the locking protrusions 24, 24A as fulcrums. It is held in a floating state where it can be tilted and rotated within a predetermined range.

Next, the operation of the plug-in connection device 100 configured as described above will be explained based on FIG. 3. FIG. 3 shows a state in which the relative position between the plug-in connection device 100 and the blade 7 is deviated from the normal position by a dimension D1, and the contacts 4, 4 are inclined to almost the maximum of the above-mentioned floating range. In this state, the lower contactor 4 abuts against the limiting protrusion 28 and the floating range is restricted. At the same time, the lead-in portion 44 of the upper contact overlaps the slope 17 of the central barrier 16 by a dimension D2. In this way, the gap between the tip of the introducing portion 44 and the inner wall of the insulating case 1 or 2 is always closed by the tip inclined portion 17 or 27 of the central barrier 16, 26. Therefore, as shown in FIG. 3, even if the blade 7 is inserted with the contacts 4, 4 shifted downward to the maximum extent and the blade 7 is shifted upward to the maximum extent, the blade 7 will enter into the introduction part 44 and the contactor will be inserted. 4 and 4 are pulled back upward. In this way, the blade 7 is prevented from entering the gap between the introduction part 44 of the contact and the inner wall of the chamber 111 and causing poor contact or deformation of the contact.

Furthermore, the insertion port for the blade 7 is located in the central barrier 16,
26 narrows the floating tilting range of the contacts 4, 4, so that the contacts 4, 4 are not damaged by the entry of the blade 7 which has caused an abnormal positional shift. Prevented. Also,
Since the electric wire 6 welded to the contacts 4 has a thin core wire 61, it flexibly deforms in accordance with the movement of the contacts 4.

[Effect of idea]

As described above, according to this invention, a slit is provided along almost the entire length of the contact leg of the contact, and a barrier that fits loosely into the slit is provided protruding from the inner wall of the insulating case. It is possible to prevent the contact from being inserted into the leg, and to prevent the contact from slipping between the inner wall of the insulating case that covers the tip of the contact and the outside of the tip of the contact, and to ensure the reliability of the floating locking of the contact. A high plug connection is obtained.

[Brief explanation of the drawing]

Figure 1 is a plan view with part of the upper insulating case removed, Figure 2 is a cross-sectional view of Figure 1, and Figure 3 is a cross-sectional view of Figure 1.
The figure is an explanatory diagram of the operation. In the figure; 1 and 2 are insulation cases, 21 and 21
A is a locking protrusion, 15, 25 is a positioning protrusion, 16,
26 is a central barrier; 18, 28 are limiting protrusions; 4;
4 is a contact, 41 is a flat part, 42 is a slit, 4
3 is a contact leg, 45 and 45A are recesses, and 6 is an electric wire. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] A flat part where plate members are overlapped and electric wires are welded and connected, and each of the overlapped plate members extends from the flat part with a predetermined gap. At the same time, the tip is bent and expanded outward,
Further, a slit is provided in the center from the bent and expanded tip to the flat part, and the contactor has a contact leg part that clamps the terminal blade, and the contactor is formed to have a thickness smaller than the width of the slit,
projecting from the end of the contact leg on the flat side to a position corresponding to the tip of the contact leg, facing the upper and lower inner walls, and each on the tip side of the contact leg. A plug-in connection device characterized in that it comprises an insulating case with a central barrier formed with an outwardly widening ramp and inserted at least partially into the slit of the contact leg.