JPH03112072A - Terminal device - Google Patents

Abstract

PURPOSE:To easily insert an electric wire and surely hold it in the locked and connected state by inserting the electric wire between a fixed terminal board and both lock pieces, rotating a cam, and coupling the coupling recesses on both end sections in the longitudinal direction across the rotary center of the cam with tip side bent sections of both lock pieces respectively. CONSTITUTION:An electric wire 40 is inserted into a pair of electric wire insertion holes 16 and 16 of a unit body 11 and inserted between a fixed terminal board 21 and tips of both look pieces 29 and 29 respectively. When a cam 31 is rotated and one end of the cam 31 is removed from the bottom section 27 of a plate spring 26, coupling recesses on both end faces 34 and 34 of the cam 31 are coupled with tip side bent sections 30 and 30 of both lock pieces 29 and 29 respectively. The plate spring 26 is made straight by its elasticity while the bottom section 27 is released from the action of the cam 31 and deflected upward, and both lock pieces 29 and 29 are rotated outward, i.e., in the opposite direction to the cam 31, and acted in the locking direction. Both lock pieces 29 and 29 are pressed by both ends of the cam 31 and pressed to both side sections of the terminal board 21 respectively. The electric wire 40 is elastically pinched, locked and connected.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a terminal device that connects an electric wire to a terminal plate by using the elasticity of a locking piece without using screws or the like. This invention relates to a locking connection and a structure for releasing this locking connection.

(Prior Art) Conventionally, this type of terminal device for locking and connecting electric wires to a terminal board consists of a leaf spring built into the device body, as described in, for example, Japanese Utility Model Application Publication No. 56-109276. The structure was such that the tip of the lock piece was always close to and opposed to the fixed terminal board. That is, in the natural state where the electric wire is not connected, the distance between the tip of the locking piece and the fixed terminal plate is less than or equal to the diameter of the electric wire. When an electric wire is inserted into the wire insertion hole of the device body, the lock piece is pushed away from the fixed terminal plate by the electric wire, and the electric wire is elastically inserted between the terminal plate and the tip of the lock piece. Once inserted, this wire was to be locked and connected.

In addition, this type of terminal device also has a structure in which a release button is provided so that the lock by the lock piece can be released and the connected electric wire can be easily removed. This release button is
As the locking piece is pressed, the locking piece is pressed to displace the tip of the locking piece in a direction away from the fixed terminal board and the electric wire. In the terminal device described in the above publication, the swingable release button selectively presses one of a pair of locking pieces that respectively lock the electric wires. As described in Japanese Patent Application No. 61-142375, a structure was also adopted in which a release button that can move forward and backward and is pressed by a rotatable cam simultaneously presses a pair of locking pieces.

In any case, conventionally, the release button was configured to press the lock piece only in the direction away from the fixed terminal board.

However, if the tip of the locking piece is always close to and facing the fixed terminal board as in the conventional terminal device described above, locking can be performed simply by inserting the wire, and the wire is a thick single wire with a certain degree of strength. If the wire is a stranded wire or a thin single wire, the wire cannot be easily inserted. Therefore, it is conceivable to insert the electric wire while separating the tip of the locking piece from the terminal board using a release button, but that would be time-consuming.

In addition, in order to make it possible to insert twisted wires or thin single wires, the elasticity of the lock piece must be weakened, but if this is done,
The holding power for the electric wire becomes weak.

(Problem to be Solved by the Invention) As described above, in the conventional terminal device for locking and connecting electric wires, the tip of the locking piece is always close to and facing the fixed terminal board unless the release button is pressed. In order to be in a state of
When inserting a wire in this state, the wire must be inserted while pushing away the locking piece. Therefore, the wire that can be inserted must have a certain degree of strength, making it difficult to insert stranded wires or thin single wires. was there. In addition, in order to solve this problem, inserting the wire while operating the release button, which is originally intended to release the lock connection, is time consuming. The problem arises that the power becomes weaker.

The present invention aims to eliminate the above problems,
It is an object of the present invention to provide a terminal device that can easily insert an electric wire even if the electric wire is a stranded wire or a thin single wire, and can reliably hold the electric wire in a locked and connected state. That is.

[Structure of the invention]

(Means for Solving the Problems) The terminal device of the present invention includes a container made of an insulator having a pair of wire insertion holes, and a pair of wire insertion holes that are movably supported within the container and whose wire insertion holes respectively face each other. A leaf spring having a locking piece, a fixed terminal plate fixed inside the container body and facing each of the locking pieces from the outside, and a cam movably supported by the container body and actuating the locking piece. It is prepared.

In order to achieve the above object, first, the leaf spring has proximal bent portions bent to the same side at both distal end portions, and portions further distal than the proximal bent portions are bent to the same side. Both locking pieces have distal side bending parts bent outward toward the tip, and both base side bending parts are rotatably supported. ing. Further, the cam is located inside between the opposite end portions of the leaf spring and is rotatably supported in a direction substantially parallel to the central axis of rotation of the locking piece. In addition, each of the engagement recesses is provided at both ends in the longitudinal direction sandwiching the center of rotation, and is engaged with both tip side bent portions of the leaf spring simultaneously in a detachable manner. In addition, the distance between one longitudinal end of the cam and the center of rotation is the distance between both base-side bent portions of the leaf spring when both engaging recesses are engaged with the image front-side bent portions. This distance is longer than the distance between the portion and the center of rotation of the cam.

(Function) In the terminal device of the present invention, when connecting electric wires in a locked manner, first, the cam located between the bent ends of the leaf spring on both sides is rotated, and one longitudinal end of the cam is connected to both bases of the leaf spring. Press this part toward the part between the side bends. This results in
The leaf spring, which is rotatably supported at both base side bent parts, bends in the direction opposite to the protruding direction of both side tips at the part between both base side bent parts, and the locking pieces at both side tips are bent inside. the terminal plate away from the fixed terminal plate on the outside.

Next, in this state, insert the electric wires into the pair of electric wire insertion holes of the container, and insert them between the fixed terminal board and both locking pieces, and then rotate the cam. Engagement recesses at both ends in the longitudinal direction sandwiching the center of rotation are respectively engaged with respective bent portions on the front end side of both locking pieces. Then, in this state, the distance between the portion between both base side bent portions of the leaf spring and the rotation center of the cam is shorter than the distance between this rotation center and one longitudinal end of the cam, so both chains The lock pieces are pressed outward and are respectively pressed against the fixed terminal plates. As a result, the electric wires are elastically clamped by both locking pieces and the fixed terminal plate, respectively, and are firmly locked and connected. Moreover, this locked state is reliably maintained by the engagement between the engagement recess and the distal end side bent portion. Also, when removing the electric wire, first rotate the cam to remove its engagement recess from the bent part on the tip side of the leaf spring, and press one end of the cam to the part between the bent parts on both base sides of the leaf spring. . As a result, the locking piece separates from the fixed terminal board and the wire as described above.
The lock on this electric wire is released.

Then, in this state, the electric wires are each pulled out from between both locking pieces and the fixed terminal board.

(Example) Hereinafter, the configuration of an example of the terminal device of the present invention will be described based on the drawings.

Reference numeral 11 denotes a container body, and this container body 11 is formed in the shape of a case with a flat surface made of an insulating material. For example, as shown in FIG.
3, etc. A pair of wire insertion holes 16, 16 are formed on both left and right sides of the container body 11, leading from the outside to the inside. In addition,
In the illustrated embodiment, these wire insertion holes 16,16 are slanted. As shown in FIGS. 1 and 2, fulcrum pins 18 extending in the front-rear direction are provided on both left and right sides of the storage chamber 17 in the container body 11. 18 are formed respectively, and leaf spring support ribs 19 and 19 are formed below these fulcrum pins 1g and ill, respectively. Further, an escape recess 20 is formed on the upper surface of the storage chamber 17 in the container body 11 as shown in the drawing.

A fixed terminal plate 21 made of a conductive material is fixedly attached to the storage chamber 17 in the container 11. The fixed contact plate 21 has a substantially U-shape when viewed from above in the figure, and is disposed along both left and right side surfaces and the rear surface of the storage chamber I7.

Reference numeral 26 denotes a leaf spring made of a conductive material, and this leaf spring 26 has a flat bottom part 27 whose longitudinal direction is the left-right direction, and a base-side bent part 28 bent upward in the figure.
28 at both left and right ends, and portions further toward the ends of these base-side bent portions 28 and 28 serve as locking pieces 29 and 29, respectively. In addition, distal end bent portions 30.30 are formed in the intermediate portions of the pair of locking pieces 29.29, respectively, and are bent outward in the left-right direction toward the distal ends thereof. 29 is almost U
It is in the shape of a letter.

Both base side bent portions 28.28 of the leaf spring 26 are connected to both fulcrum pins 18.18 of the vessel body 11 and both support ribs 1.
They are supported rotatably by being sandwiched between the upper ends of the 9° 19 shown in the drawing. In this way, the leaf spring 26 built in the storage chamber 17 is connected to both fulcrum pins 1 extending in the front and back direction.
8. The end portions on both sides can be elastically deformed to rotate with 18 as the center axis of rotation. The left and right sides of the fixed terminal plate 21 face the ends of the locking pieces 29.29 from the outside, and the wire insertion holes 16.16 of the container body 11 face the ends of the locking pieces 29.29. ing.

31 is a cam formed in an elongated rectangular shape, and this cam 3I
is located inside between the ends of both sides of the leaf spring 26,
It is rotatably supported in the storage chamber 17 in the container body 11 by a support shaft 32 with the front-rear direction as the rotation center axis direction. Note that this support shaft 3 located at the center in the longitudinal direction of the cam 31
A recessed groove 33 for engaging a tool such as a flathead screwdriver is formed on one end surface of the support shaft 32, and one end surface of the support shaft 32 with this recessed groove 33 is exposed on the outer surface of the container body 11. . Further, on both longitudinal end surfaces of the cam 31 sandwiching the support shaft 32, there are bent portions 3θ, 3 on the image front side of the leaf spring 26.
A groove-shaped engagement recess 34 that is simultaneously and removably engaged with 0.
．． 34 are formed respectively.

The distance between these engagement recesses 34 and 34 is determined by
It is longer than the distance between 0 and 0. In addition, the cam 31
The distance between the center of rotation and one longitudinal end of the leaf spring 2G is the distance between the center of rotation and one longitudinal end of the leaf spring 2G when the engaging recesses 34, 34 are engaged with the bent portions 30.30 on the front side of the image. 28
The distance between the bottom portion 27 and the center of rotation of the cam 31 is longer than the distance between the bottom portion 27 and the center of rotation of the cam 31. Therefore, when the longitudinal direction of the cam 3I is perpendicular to the direction connecting both base side bent portions 28. It will be pressed against the bottom part 27, which is the part between .

Along with this, the image leading edge side bent portion 30 at this time. 30
The distance therebetween is shorter than the distance between the image leading edge side bent portions 30.30 when engaged with both the engagement recesses 34.34 of the cam 31. Further, one end of the cam 31 is connected to the leaf spring 2.
When pressed against the bottom 27 of 6, both locking pieces 29, 2
The tip of 11 is approximately 4G wire from both sides of the fixed terminal board 21.
The distance is at least the diameter of the core wire.

Next, the operation of the above embodiment will be explained.

In order to lock and connect the electric wire 40, first, as shown in FIG. 1, the cam 31 is placed in a state in which its longitudinal direction is in the vertical direction in the figure. At this time, if necessary, the cam 31
To rotate the cam 31, a flathead screwdriver or the like may be inserted into the groove 33 of the support shaft 32, which is the center of rotation of the cam 31, and rotated. In this state, one longitudinal end of the cam 31 is connected to the bottom 27 of the leaf spring 26.
Pressed from above as shown in the figure. As a result, the leaf spring 26, which is rotatably supported at both base side bent portions 28.28, has a bottom portion 27 between both base side bent portions 28. As it bends to the side, the locking pieces 29.29 at the ends of these both sides
pivot inwardly, ie towards the cam 31, about each fulcrum pin 18,18. Therefore, both locking pieces 29, 29 are relatively far apart from both sides of the fixed terminal plate 21 on the outside thereof. Note that the movements of the cam 31 and the leaf spring 26 are indicated by arrows in the drawing.

Next, in this state, as shown in FIG. 4, insert the electric wires 4G into the pair of electric wire insertion holes t6. Insert each between. After that, as shown in Figure 2,
The cam 31 is rotated 90 degrees to separate one end of the cam 31 from the bottom 27 of the leaf spring 26, and the engagement recesses 34 and 34 on both end surfaces of the cam 31 are moved toward the ends of the locking pieces 29, 29. The flexures 311 and 30 are respectively engaged. Then, due to its own elasticity, the bottom part 27 of the leaf spring 26, on which the cam 31 no longer acts, bends upward in the figure and straightens, and both locking pieces 29.29 move outward, that is, in the direction opposite to the cam 31. It rotates to act in the locking direction. In addition, by being pressed by both ends of the cam 310, the lock pieces 29 are pressed toward both sides of the fixed terminal plate 21, respectively. As a result, the electric wire 40
are elastically clamped by both locking pieces 29, 29 and both sides of the fixed terminal board 21, respectively, and are firmly locked and connected.

Moreover, when removing the electric wire 40, as shown in FIG. 1, first rotate the cam 31 by 90 degrees, and then
4 from the distal bend 30.30 of the leaf spring 26 and press one end of the cam 31 against the bottom 27 of the leaf spring 26. This allows the lock piece 29.29 to be locked as described above.
is separated from both sides of the fixed terminal board 21 and the electric wire 40, and the lock on the electric wire 40 is released.

In this state, the electric wires 40 are each pulled out from between the lock pieces 29 and 29 and both sides of the fixed terminal board 21,
Furthermore, the wire is pulled out from the wire insertion hole 16.16 of the container body 11.

According to the above configuration, both locking pieces 29°29 by the cam 31
can be placed a sufficient distance away from both sides of the fixed contact plate 21, so when the electric wire 40 is inserted and locked, the lock pieces 29 and 29 do not get in the way of insertion, and the electric wire 40 This electric wire 40 can be easily inserted even if it is a weak twisted wire or a thin single wire. Of course, it is also easy to release the locked connection and pull out the electric wire 40.

Moreover, since both locking pieces 29, 29 are self-maintained by the cam 31 in a state where they are separated from the fixed contact plate 21, it does not take much effort.

In addition, even though the electric wire 40 can be easily attached and detached in this way, if both ends of the cam 31 are brought into contact with the front end bent portions 3[1, 30 of the locking pieces 29°290, these locking pieces 29 .29 is pressed toward both sides of the wire 40 and the fixed terminal plate 21, and the cam 31 reliably restricts the inward displacement of both lock pieces 29 and 29, so the wire 40 is locked and connected. It can be reliably locked in the locked state. Furthermore, this locked state is held even more reliably by the engagement between the engagement recess 34.34 of the cam 3I and the distal end bent portion 30.30 of the leaf spring 26. In this way, the electric wire 4Q can be firmly held by the elastic force of the leaf spring 26 itself and the suppression of the cam 31, thereby improving the reliability of the connection.

Whether it is locked or unlocked, by operating only one cam 3I, the pair of locking pieces 29
．． 29 can be operated at the same time, which is convenient.

Further, since the leaf spring 26 has a symmetrical shape and the cam 31 has a rotationally symmetrical shape, no matter which direction the cam 31 is rotated, the cam 31
Each time the plate spring 26 is rotated by 90 degrees, the cam 31 alternately pushes the bottom portion 27 of the leaf spring 26 and the distal end side bent portion 30.

Further, since the leaf spring 26 is pushed by the rotating cam 31, the operating force required to push the leaf spring 2G is small, and the electric wire 40 can be locked and unlocked with a small force.

In particular, according to the configuration of the above embodiment, in order to rotate the cam 31, the groove 3 is exposed to the outside in the support shaft 32.
3, it is possible to confirm from the outside whether the lock is in the locked or unlocked state by looking at the direction of the groove 33.

For example, in the illustrated embodiment, if the groove 33 is vertical, it is in the unlocked state, and if the groove 33 is horizontal, it is in the locked state.

Note that when using the above screwless terminal device as a ground terminal, no special tools are required because it is not screwed in as in conventional devices.Also, the terminal part is a live part and should not be exposed, but especially when the lid is closed. There is no need to close the door, and since the surface is flat, it does not get in the way.

〔Effect of the invention〕

According to the present invention, locking pieces are formed at both end portions of the leaf spring via the bent portions on the base side, and the bent portions on both claw portion sides are rotatably supported. One end in the direction rotatably supports a cam that presses the portion between the bent portions on both claw portion sides of the leaf spring, and a cam is simultaneously attached to the tip bent portions formed on both locking pieces at both longitudinal ends of this cam. Since the engagement recess is formed, when one end of the cam presses the portion between the bent portions of the leaf spring on both claw sides, both locking pieces will be displaced inward and these locking pieces will be displaced inward. By moving away from the fixed terminal plate on the outside of the piece, when making a lock connection, the wire can be easily placed between the fixed terminal plate and the lock piece, even if the wire is a stranded wire or a thin single wire. In addition to being able to easily insert the locked wire into the wire, it is also easy to remove the locked wire. In addition, when both the engaging recesses of the cam are engaged with the bent portions on the front end side of the leaf spring, the cams restrict the positions of both locking pieces and push them outward, thereby locking the electric wire. The connected state can be maintained reliably and firmly. Moreover, by operating one cam, a pair of locking pieces can be operated, and since the cam rotates, the cam that pushes the leaf spring can be operated with a small force, resulting in good operability. .

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views showing one embodiment of the terminal device of the present invention, Figure 3 is a perspective view of the same leaf spring and cam, and Figure 4 shows how it is installed in the main body of the wiring device. FIG. 11. Vessel body, 16. , 16... Wire insertion hole, 21 - Fixed terminal plate, 26... Leaf spring, 28. 28... Base side bending part, 29.29... Locking piece, 30.30... Tip side bending part, 3I ...Cam, 34.34...Engagement recess. 】iU”

Claims (1)

[Claims] (1) A container body made of an insulator having a pair of wire insertion holes, a plate spring movably supported within the container body and having a pair of locking pieces with both wire insertion holes facing each other, and a leaf spring provided within the container body. A fixed terminal board made of a conductor that is fixed and faces each of the lock pieces from the outside, and a cam that is movably supported by the container body and operates the lock pieces, and the leaf springs are on the same side. The distal end portions of both sides each have a proximal bent portion that is bent toward the base side, and the portions further toward the distal end than these proximal bent portions serve as the locking pieces, and the locking pieces have a proximal portion extending outward toward the distal end. each has a distal end side bending portion bent in a direction, and both base side bending portions are rotatably supported, and the cam is located inside between both side distal end portions of the leaf spring. It is rotatably supported in a direction substantially parallel to the rotation center axis direction of the lock piece, and
Engagement recesses are provided at both ends in the longitudinal direction sandwiching the center of rotation, and engage recesses that are simultaneously removably engaged with bent portions on both tip sides of the leaf spring, and between one end in the longitudinal direction of the cam and the center of rotation. The distance is longer than the distance between the portion between both base side bent portions of the leaf spring and the center of rotation of the cam in a state where both the engagement recesses are engaged with both tip side bent portions. A terminal device characterized by: