JPH0729583Y2 - Wire holder for terminal block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electric wire holding device for a terminal block for connecting each electric wire as an end treatment of electric wires.

<Prior Art> A terminal block having a plurality of connecting portions electrically connected by a conductive piece is known.

In this terminal block, as a device for connecting and holding the electric wire to the conductive piece, a metal crimping terminal such as a ring or a fork is fixed to the tip of the electric wire, and the crimped terminal is fixed to the conductive piece with a screw. Various types have been provided, such as one that is electrically connected to a conductive piece, one that is soldered, etc., but all of them have been troublesome such as fixing a crimp terminal to a conductive piece. Therefore, in order to simplify the attachment, various types have been devised in which the conductor exposed from the end of the electric wire is elastically contacted with the conductive piece side by a crimp spring. By the way, these are
In both cases, only the conductor wire is sandwiched,
For this reason, if a conductor that is not knitted is applied, the surface resistance is weak and it is easy to escape by pulling the wire, and to prevent this, if you try to bite hard with the sharp tip, the wire will be pulled at the biting part as the wire pulls. This creates the new drawback of cutting.

The present invention can easily hold an electric wire, and
An object of the present invention is to provide a terminal block having a structure capable of holding an electric wire with a sufficient force by sandwiching the cover portion differently.

<Means for Solving the Problems> The present invention is directed to a terminal block in which conductive pieces having wire connecting portions on both left and right sides are held in an interstitial shape, and at least each wire connecting portion at both ends is made into a heavenly shape, A conductive piece having a screw hole formed in the plate part and having both ends serving as insertion holes for the conductive wire, a tightening screw screwed into the screw hole of the conductive piece, and a neck portion of the tightening screw supported to be freely rotatable. A screwed plate portion,
Inserted from the insertion port of the conductive piece, with the lower surface as a crimping surface, a crimping plate portion for sandwiching the conductor wire between the lower bottom surfaces of the conductive piece, and a crimping tip for pressing the electric wire coating extending laterally. An electric wire holding piece including a cover holder made of the synthetic resin material described above.

<Operation> When the lead wire of the electric wire is inserted into the insertion hole of the conductive piece and the tightening screw is advanced, the wire holding piece moves down together with the tightening screw, and the crimping plate portion of the wire holding piece is attached to the conductive piece. The crimping surface of the crimping plate contacts, and the lower end of the tightening screw presses the crimping plate part, so that the crimping surface of the crimping plate part is strongly pressed against the conductor wire to secure its electrical connection. Further, at this time, the synthetic resin covering presser also descends, its pressure-contacting projections press-contact the electric wire covering, and the electric wire is held at the connecting portion at the electric wire covering and the conducting wire. At this time, although the wire and the wire covering have different shrinkage allowances, since the pressure contact tip is made of synthetic resin, it has some bending and even if the wire is strongly pressed on the crimping surface, the wire covering is performed with an appropriate force. Will be supported.

And each electric wire will be electrically connected by a conductive piece.

<Example> With reference to FIG. 1, a general structure of a terminal block 1 of this type will be described.

The terminal block 1 is formed of an insulating resin material such as polycarbonate into a plate shape. On one surface side of the back plate 2, an upper plate part 3, a bottom plate part 4 constituting the lower surface of the terminal block 1, and a back plate 2 are formed. A thin portion such as the partition wall 5 which is separated into left and right is integrally formed.

Further, locking claws 6, 6 are vertically provided at both ends of the bottom plate portion 4 of the terminal block 1, and engaging edges 8, 6 at both ends of a mounting rail 7 made of aluminum or the like are provided.
It is locked at 8 to prevent upward escape. Then, a plurality of terminal blocks 1 are connected on the mounting rail 7 and integrally fixed.

A conductive piece 10 is provided across the partition wall 5 on the upper plate portion 3. As shown in FIG. 3, the conductive piece 10 is composed of a frame body in which a plate material is bent and has a rectangular cross section. Both ends of the frame body are opened to serve as an insertion port for the conducting wire y. The left and right ends of the conductive piece 10 which are divided by the partition wall 5 are used as connection portions 11, 11 and screw holes 14, 14 are formed in the top plate portion 12 at that position. Further, inside the conductive piece 10, there is formed a stopper 13 for restricting the insertion position of the conductive wire as described later. In the conductive piece 10, only the connecting portions 11, 11 may have a rectangular cross section.

Then, tightening screws 15, 15 are screwed into the screw holes 14, 14. A toothless portion 16 is provided on the neck portion of the tightening screws 15 and 15, and an electric wire holding piece 20 is locked to the toothless portion 16.

The structure of the wire holding piece 20 will be described with reference to FIG.

Reference numeral 21 is a U-shaped pressing metal fitting, and an insertion hole 22 for the tightening screw 15 is formed in a screwing plate portion 23 composed of an upper plate thereof. The insertion hole 22 is externally fitted to the toothless portion 16 to support the tightening screw 15 so that it cannot be moved up and down with respect to the pressing metal fitting. The length of the tightening screw 15 is set so that the lower end of the tightening screw 15 contacts the upper surface of the crimping plate portion 24 constituted by the lower plate of the pressing metal fitting in the inserted state. The lower surface of the crimping plate portion 24 of the pressing fitting 21 serves as a crimping surface 25 that holds the conductor wire.

Furthermore, the side surface of the presser fitting 21 is outwardly bifurcated protruding pieces 26, 2
6 is formed.

In the pressing member 21 having such a configuration, after the tightening screw 15 is screwed into the screw hole 14, the insertion hole 22 is externally fitted to the toothless portion 16 from the notch,
The crimping plate portion 24 is positioned inside the insertion port of the conductive piece 10.

Reference numeral 27 is a substantially L-shaped cover retainer which constitutes a part of the wire holding piece 20 and is made of a synthetic resin material. The covering foot 27
The protrusions 26, 26 are fitted in the both side grooves 30, 30 of the rising portion 28 and assembled to the holding metal fitting 21.
An end portion of a pressing portion 29 protruding laterally from the lower end of 28 is bent downward, and the tip end thereof serves as a pressure contact projection 31. Due to the protrusion of the pressing portion 29, the pressure contact tip 31 has appropriate flexibility.

The operation of the above configuration will be described. As shown in FIGS. 1 and 2, the coating z is removed from the tip of the electric wire x to expose the conductor wire y, and the conductor wire 10 is inserted into the conductive piece 10 until the tip of the conductor wire y contacts the stopper 13. Then, when the tightening screws 15 and 15 are screwed in, the wire holding piece 20 is interlocked while being pressed against the lower end thereof, and the crimping surface 25 of the crimping plate portion 24 press-contacts with the conductor wire y and the press-contacting tip of the covering presser 27. 31 cuts into the coating z of the electric wire x. At this time, the wire y and the coating z have different shrinkage allowances, but since the pressure contact projections 31 are made of synthetic resin, they have some bending, and even if the wire is strongly pressed on the crimping surface, an appropriate force is applied. It will support the wire coating. Further, unlike the object formed by the edge of the metallic material, the coating z is not broken.

Then, the conductive wire y of the electric wire x contacts the conductive piece 10,
It is electrically connected to the electric wire x held by the other connecting portion 11 via 10.

In this connected state, the projecting pieces 26, 26 of the cover retainer 27 project to the side of the terminal block 1 on the wire insertion side. However, since the cover retainer 27 is made of a synthetic resin that is an insulating material, it electrically shields the conductive portion by insulating it laterally, and can prevent an unnecessary short circuit with the outside. Becomes

<Effects of the Invention> As has been made clear by the above description, the present invention is such that the fastening screw 15 is screwed into the screw hole 14 formed in the top plate portion of the conductive piece 10, and the crimping plate portion is attached to the fastening screw 15. 24 is the conductive piece 10
Of the electric wire x is supported by the electric wire holding piece 20 to be inserted from the insertion port of the electric wire x, and the electric wire holding piece 20 is provided with a cover retainer 27 made of a synthetic resin material in which the press contact tip 31 is laterally extended. Is inserted into the insertion port of the conductive piece 10, and the crimping surface 25 of the crimping plate portion 24 is pressed against the lead wire y at the lower end of the tightening screw 15 by the screwing operation of the tightening screw 15, and the electrical connection is made. Since the pressure contact tip 31 of the presser foot 27 is pressed against the wire cover z, the following effects can be obtained.

1) The conductor y of the electric wire x and the coating z are firmly held,
Even if the electric wire x is pulled, it does not easily come off or break.

2) At the time of connection, even if the shrinkage allowances of the conductor wire y and the wire covering z are different, the flexibility of the pressure contact projections 31 supports the wire covering z with an appropriate force.

3) Pressed against the lower end of the tightening screw 15, the pressure bonding surface of the pressure bonding plate 24
25 is in surface contact with the conductor y. Therefore, even if the tightening screw 15 is tightened, the conductive wire y can be firmly held without being cut, and the electrical connection can be surely made.

4) Protrusions 26, 26 of a cover retainer 27 made of a synthetic resin material protrude from the side of the terminal block 1 on the side where the electric wire is inserted. Therefore, the projecting pieces 26, 26 insulate the conductive portion laterally and electrically protect the conductive portion, thereby preventing an unnecessary short circuit with the outside.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of the terminal block 1 of the present invention, and FIG.
FIG. 3 is a sectional view taken along the line AA, and FIG. 1; terminal block, 10; conductive piece, 11, 11; connection part, 14, 14; screw hole, 1
5,15; Tightening screw, 20; Wire clamping piece, 21; Holding metal fitting, 22; Insertion hole, 23; Screwing plate part, 24; Crimping plate part, 25; Crimping surface, 27; Covering presser, 31; Pressure welding Tip x: electric wire, y: conductor wire, z: coating

Claims (1)

[Scope of utility model registration request] 1. A terminal block in which a conductive piece having wire connecting portions on both left and right sides is held in a crosswise manner, at least each wire connecting portion at both ends is formed into a ceiling shape, and a screw hole is formed in the top plate portion, And a conductive piece having both ends as insertion ports of the conductive wire, a tightening screw screwed into a screw hole of the conductive piece, and a screwing plate part that rotatably supports the neck part of the tightening screw,
Inserted from the insertion port of the conductive piece, with the lower surface as a crimping surface, a crimping plate portion for sandwiching the conductor wire between the lower bottom surfaces of the conductive piece, and a crimping tip for pressing the electric wire coating extending laterally. An electric wire holding device for a terminal block, comprising: an electric wire holding piece made of a synthetic resin material.