JPH04363875A - Terminal block - Google Patents

Abstract

PURPOSE:To simultaneously hold the exposed part and coated part of a cable in a terminal block and increase the tensile strength. CONSTITUTION:A conductive frame body 14 is fitted and installed onto a terminal metal fitting 10 held by a body frame 3 in such a manner as to be capable of rising and falling, and a coat pressing piece 22 is held in the lower part of the conductive frame body 12 to dispose a press contact surface 25 formed on the end part of the coat pressing piece 22 in a position opposite to the holding edge 5 of a cable entrance 4 formed on the body frame 3. A fastening screw 28 is spirally fitted to the upper part of the frame body 10, and the exposed part (y) of a cable (x) is nipped by terminal metal fitting 10 and the inner bottom part 17 of the conductive frame 14 by the fastening operation of the fastening screw 28, and the cable (x) is connected with the terminal metal fitting 10 and held. The coated part (z) of the cable (x) is nipped between the holding edge 5 of the entrance 4 and the press contact surface 25, and the exposed part (y) and coated part (z) of the cable (x) are simultaneously held only by the rotating operation of the fastening screw 28.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal block used for connecting conductor wires.

0002

2. Description of the Related Art Various terminal blocks have been proposed that include terminal fittings for connecting lead wires to each other or for electrically connecting required conductive paths on a printed circuit board and electric wires.

0003

[Problems to be Solved by the Invention] By the way, in the conventional terminal block configuration, the bare wire part of the electric wire is held at the connecting part to simultaneously perform the holding and electrical connection. There have been problems in that the bare wire portion is likely to break when vibrations are applied or the wire is pulled, and the bare wire portion is likely to become loose. The present invention aims to eliminate such problems with the conventional configuration.

0004

[Means for Solving the Problems] The terminal block of the present invention includes an electric wire inlet having a holding edge formed therein, a connection gap communicating with the electric wire inlet, and a connection gap perpendicular to the insertion direction of the electric wire from the electric wire inlet. a main body frame made of an insulating material and having an operating hole that communicates with the main body frame; A screw hole is formed in the hole, a holding gap is formed in the lower part, and the press-fitting side of the terminal fitting is inserted into the inside thereof so that it can be raised and lowered into the operating hole, and there is a space between the inner bottom surface of the terminal fitting and the press-fitting side of the terminal fitting. a conductive frame that holds the bare wire portion of the electric wire; a conductive frame that is attached to the holding gap of the conductive frame; a pressure contact surface is disposed at the wire entrance of the main body frame; and the pressure contact surface and the holding edge of the wire entrance A covering clamping piece that clamps the wire covering portion is screwed into the screw hole of the conductive frame from the operation hole of the main body frame, and its lower end abuts the terminal fitting, and as the wire is rotated, the conductive frame and a tightening screw that moves up and down within the connecting gap.

[0005]

[Operation] Insert the wire from the wire entrance, position the bare wire part between the pressure welding side of the terminal fitting and the inner bottom surface of the conductive frame, and then attach the covered part to the holding edge of the wire entrance. The position should be in contact. Then, the tightening screw is threadedly operated. Along with this, the lower end of the tightening screw is in contact with the press-contact side of the terminal fitting held by the main body frame, so that the conductive frame rises as the screw rotates. and,
At the same time that the inner bottom surface comes into pressure contact with the sheathing part of the electric wire, the sheathing clamping piece fixed in the holding gap of the conductive frame also rises together with the conductive frame, and the pressing surface of the sheathing clamping piece presses against the sheathing part. The covering portion is held between the holding edge and the pressing surface. Therefore, by rotating the tightening screw, the bare wire portion and the covered portion of the electric wire are simultaneously held and fixed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A structure in which the present invention is applied to a printed circuit board terminal block 1 will be described below. In FIG. 1, the terminal block 1 is composed of a short connecting portion 2a and a long connecting portion 2b, which are connected in plurality in a direction perpendicular to the plane of the drawing of FIG. These connecting portions 2a and 2b are integrated by a main body frame 3 made of an insulating material.

To explain the structure of this connecting part 2a, the front part of the main body frame 3 has a wire inlet 4 which opens to the side and has a holding edge 5 formed therein, and a bottomed shape that communicates with the wire inlet 4. , and an operating hole 8 that communicates with the connection gap 7 above. Further, the operating hole 8 has a screw holding hole 9 at its upper part that is equal to the outer diameter of a tightening screw 28, which will be described later, and the screw holding hole 9 prevents the tightening screw from tilting. The main body frame 3 is made of a narrow synthetic resin board with a width of about 5 mm.

[0008] An L-shaped terminal fitting 10 is disposed in the connection gap 7 so that its horizontal press-contact side 11a crosses the operating hole 8, and its vertical portion 11b is placed at the bottom of the main body frame 3. It is inserted and installed. This terminal fitting 10 is shown in FIG.
As shown, engagement grooves 11 are provided on both side edges of the vertical portion 11b.
c, 11c are formed, and the main body frame 3 fits into the engagement groove 11.
c and 11c to restrict the vertical movement, and the bent edge 11d at the tip of the pressure contact side 11a bites into the main body frame 3 near the operating hole 8 and is held in the main body frame 3 immovably. The branch-shaped lower end of the vertical portion 11b projects downward from the bottom surface of the main body frame 3 to serve as a pin terminal 11e, which is inserted into a through hole of the printed circuit board p as shown in FIG. 1 to form a conductive path. This allows for electrical connection.

Further, in the operating hole 8, a square-shaped conductive frame 14 made of a metal material has a terminal fitting 10 inside it.
It is disposed so as to be able to rise and fall by passing through the press-contact side 11a, and its lower part faces into the connection gap 7. Note that the terminal fitting 10 is inserted into the conductive frame 14 in advance, and then fitted into the main body frame 3 and held as described above. The conductive frame 14 is formed by bending and forming a metal plate material,
As shown in FIG. 2, the upper portions are overlapped, and a screw hole 16 is cut in the overlapping portion 15 in the vertical direction. The upper surface (inner bottom surface) of the inner bottom portion 17 is used as a clamping surface for the bare wire portion y, as will be described later. Further, from the rear edge of the inner bottom part 17, the connecting part 18 and the inner bottom part 17 are bent twice.
A bottom portion 19 extending parallel to the inner bottom portions 17 and 19 forms a holding gap 20 between the inner bottom portions 17 and 19. And this holding gap 20
A covering clamping piece 22 is fitted to the opening.

The structure of the covering clamping piece 22 will be explained. The covering clamping piece 22 is made of a synthetic resin material, and has a thick clamping part 24 connected to the tip of a connecting plate surface 23 whose thickness is approximately equal to the interval of the holding gap 20. The upper surface of the pressure contact surface 25 is a pressure contact surface 25. An engagement hole 26 is formed in the connection plate surface 23 to connect with the connection portion 18 . The engagement hole 26 is T-shaped and has an insertion opening 27a having a width equal to the wall thickness of the linking part 18, and a holding groove part 27b that is substantially equal to the width of the linking part 18 and expanding in the width direction at the inner depth. Furthermore, a notch 27 is provided on the edge opposite to the entrance of the holding groove 27b.
c is formed. The covering clamping piece 22 is inserted into this engagement hole 26.
To connect, as shown in FIG. Rotate it to position B in Figure 3. During this rotation, the holding groove portions 27b are slightly shaved off at each corner edge of the linking portion 18, making it possible to rotate the holding groove portions 27b.

[0011] Therefore, the covering clamping piece 22
8 and is held within the holding gap 20, and the clamping part 24 is arranged at the wire entrance 4 when attached to the main body frame 3,
The pressure contact surface 25 faces the holding edge 5 at the top and bottom, and the electric wire
This creates a gap for the insertion.

A tightening screw 28 is screwed into the screw hole 16 of the conductive frame 14 mounted in this manner, and its head is held by the screw holding hole 9 as described above. Each of the above-mentioned configurations is also attached to the connecting portion 2b, and the connecting portions 2a, 2
Due to the different lengths of b, two electric wire entrances 4, 4 are disposed one above the other on the same side surface of the main body frame 3. The configuration attached to the connecting portion 2b is such that the terminal fitting 10 has a U-shaped upper part, and the pin terminal 11e passes through the bottom of the main body frame 3 from the U-shaped portion. Since the same members are applied except for the points protruding outward, the same reference numerals will be given and the description thereof will be omitted.

In addition, as shown in FIGS. 1 and 4, a mounting surface 31 for mounting a name plate 30 is formed in an inclined shape on the upper side of the connecting portions 2a and 2b, and an L is formed at the lower part of the mounting surface 31. The shape holding arm 32 is connected, and the lower edge of the name plate 30 is elastically held between the circular ridge 33 formed at the end of the L-shaped holding arm 32 and the mounting surface 31. There is. Further, in order to make it possible to remove the name plate 30 whose lower edge is held between the L-shaped holding arms 32, a tip of a tool for pushing the lower edge upward can be inserted into the lower part of the mounting surface 31. An operating groove surface 34 is formed.

The terminal block 1 having such a structure is fitted into each other by a connecting portion formed on the front and rear surfaces of the main body frame 3, in which one side is a convex portion 35a and the other side is a concave portion 35b into which the convex portion is fitted. A plurality of them are connected as shown in numbers 4 and 5, and the name plate 30 is attached in the connected state as described above.

Next, the means for connecting the electric wire x will be explained. When the conductive frame 14 is installed, the lower end of the tightening screw 28 comes into contact with the press-contact side 11a of the terminal fitting 10, and the total load of the conductive frame 14, the cover clamping piece 22, and the tightening screw 28 is It is supported by hanging on the press-contact side 11a. When the tightening screw 28 is loosened, the connecting portion 2b in FIG.
As shown in , the conductive frame 14 is in the lowered position, the lower edge of the clamping part 24 of the covering clamping piece 22 is in a position supported by the bottom surface on the entrance side of the connection gap 7, and the holding edge 5 The gap between the contact surface 25 and the pressure contact surface 25 is wide. In this state, the electric wire x with the bare wire portion y exposed from the tip is inserted, and the bare wire portion y is positioned between the pressure contact side portion 11a of the terminal fitting 10 and the inner bottom portion 17 of the conductive frame 14. Then, when the tightening screw 28 is rotated while keeping its lower end in contact with the press-contact side 11a, the conductive frame 14 floats due to its relative screw operation with respect to the screw hole 16, and its tightening position Then, the bare wire portion y of the electric wire x is held between the pressure welding side portion 11a and the upper surface (inner bottom surface) of the inner bottom portion 17, and the bare wire portion y is electrically connected to the terminal fitting 10 and is held. Ru. Further, in this tightened state, the pressure contact surface 25 of the covering clamping piece 22 comes into pressure contact with the covering portion z of the electric wire x, and the covering portion z is held between the holding edge 5 and the pressure contact surface 25. At this time, the clamping part 24 of the covering clamping piece 22 causes a slight deflection with respect to the conductive frame 14 due to the flexibility of the resin,
Due to this deflection, the pressure contact surface 25 comes into elastic contact with the covering part z,
The holding force increases, and even if there is a difference in diameter between the bare wire portion y and the covered portion z, this can be absorbed.

With this configuration, the electric wire x can be separated from the bare wire portion y and the covered portion z by only tightening the tightening screw 28.
are held at the same time, and even if a tensile force is applied to the electric wire x, the holding of the covering part z prevents a large tensile stress from acting only on the bare wire part y, making it difficult for the wire to break. The tensile resistance and vibration resistance are improved, the bare wire portion y is prevented from loosening, the electrical connection between the terminal fitting 10 and the electric wire x can be secured, and the required electrical connection can be stably made. becomes possible. And pin terminals 11e, 11e
By inserting the electric wire x into the through hole of the printed circuit board p (see FIG. 1), the electric wire x is reliably connected to the required conductive path on the printed circuit board p.

Furthermore, since the covering part z is held by the holding edge 5 and the clamping part 24, which are made of an insulating material, no conductive material is exposed to the wire entrance 4, and therefore, There is no risk of short circuit with peripheral devices.

[0018] The above-mentioned configuration has been explained with respect to a terminal block applied to a printed circuit board, but this is a terminal block in which terminal fittings are passed through a plurality of connection parts, and electric wires inserted into each connection part are electrically connected to each other. May be applied to In this case, the configuration may be such that the connecting portions 2a of FIG. 1 are arranged symmetrically, and the terminal fittings are passed from side to side, so that the terminal fittings are common to both the connecting portions. Alternatively, as a modification of Fig. 1, the left and right terminal fittings are continuously integrated within the main body frame, so that the terminal fittings can be passed between the connecting parts 2a and 2b and inserted into the respective connecting parts 2a and 2b. A configuration in which electric wires are electrically connected is also proposed. In addition, the present invention can be applied to terminal blocks of various configurations for electrically connecting and mechanically holding wires.

[0018]

Effects of the Invention As described above, the present invention holds the terminal fitting 10 in the main body frame 3 made of an insulating material, and attaches the conductive frame 14 to the terminal fitting 10 within the operating hole 8 provided in the main body frame 3. At the same time, a covering clamping piece 22 is fixed to the lower part of the conductive frame 14, and a pressure contact surface 25 formed at the end of the covering clamping piece 22 is attached to the electrical wire of the main body frame 3 by fitting it on the outside so that it can be raised and lowered. The conductive frame 14 is disposed at a position facing the retaining edge 5 of the entrance 4.
A tightening screw 28 is screwed into the upper part of the electric wire x, and by tightening the tightening screw 28, the bare wire portion y of the electric wire x is held between the terminal fitting 10 and the inner bottom surface of the conductive frame 14.
At the same time as electrically connecting and holding the terminal fitting 10, the covering part z of the electric wire x is attached to the holding edge 5 of the electric wire entrance 4.
and the pressure contact surface 25, and the bare wire portion y and the covered portion z of the electric wire x are simultaneously held by only the rotational operation of the tightening screw 28. The tensile strength and vibration resistance are improved, the bare wire portion y is prevented from breaking, and the bare wire portion y is prevented from becoming loose, thereby ensuring electrical connection thereof. In addition, the covering clamping piece 2
Due to the flexibility of 2, even if there is a difference in diameter between the bare wire part y and the covered part z, this can be absorbed and the covered part z can be held by the pressure contact surface 25. Can be applied to electric wire x. Furthermore, since the wire x is held and electrically connected by clamping it, there is no need to attach a crimp terminal or the like to the bare wire portion y, making the electrical connection easier. There is.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the mounting member.

FIG. 3 is an explanatory diagram showing a means for attaching the cover pinching piece 22.

FIG. 4 is a partially cutaway side view showing a connecting portion.

FIG. 5 is a perspective view showing a part of the connected state.

[Explanation of symbols] 1 Terminal block 3 Main body frame 4 Electric wire entrance 5 Retaining edge 7 Connection gap 8 Operating hole 10　Terminal fittings 14 Conductive frame 16 Screw hole 17 Inner bottom 18 Connection part 22 Covered pressure piece 23 Connecting plate surface 24 Squeezing part 25 Pressure contact surface 26 Engagement hole x Electric wire y Bare wire part z Covered part

Claims (1)

[Claims] Claim 1: An electric wire inlet having a holding edge formed therein, a connection gap communicating with the electric wire inlet, and an operating hole communicating with the connection gap from a direction perpendicular to the direction in which the electric wire is inserted from the electric wire inlet. A main body frame made of an insulating material, a terminal fitting held by the main body frame and having a press-contact side disposed to cross the operating hole, a screw hole formed in the upper part, and a holding gap in the lower part. A conductive frame is formed therein, and is mounted in the operating hole so as to be able to rise and fall into the operating hole by inserting the press-contacting side of the terminal fitting inside the conductive frame, and sandwiching the bare wire portion of the electric wire between the inner bottom surface of the conductive frame and the press-fitting side of the terminal fitting. attached to the holding gap between the conductive frame body and the conductive frame body;
a covering clamping piece having a pressure contact surface disposed at the wire entrance of the main body frame, and sandwiching the wire covering portion between the pressure contact surface and a holding edge of the wire entrance;
a tightening screw that is screwed into the screw hole of the conductive frame from the operating hole of the main body frame, its lower end abuts the terminal fitting, and moves the conductive frame up and down within the connection gap as the screw is rotated; A terminal block characterized by: