JPS5945195B2 - Screwless terminal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A so-called screwless terminal device, which allows the insertion of an electric wire and has a locking piece that prevents the electric wire from coming off after insertion, is unstable in contact.

In other words, one side of the wire is in full contact with the fixed terminal board, but
The opposite side is in point contact with the locking piece, and therefore, the front and back wobble up and down around the point of contact when deflection acts on the wire.

Particularly in the case of electric wires, the strands of the wires were somewhat loose, making the contact on one side of the lock increasingly unstable. The present invention has been made in view of the above-mentioned points. Namely, the movable terminal fitting is opposed to the fixed terminal fitting separately, and the movable terminal fitting is brought into elastic contact with the electric wire by spring pressure, and the electric wire is held in place. The purpose is to solve the problems of screwless terminal devices using locking pieces by sandwiching the terminal fittings from both sides with terminal fittings with a wide contact surface to stabilize the contact. The following questions are asked based on the drawings showing the present invention as an example: T is an electric wire, and I is an electric wire T.
2 is an S-shaped fixed terminal fitting that is in contact with one side a of It is a movable terminal frame.

In addition, at the tips of the upper and lower pieces 4 and 5, bent pieces 8 and 9 are bent inwardly.
is provided. Thus, the middle piece 3 faces the fixed terminal plate 1 and contacts the other side Tb of the electric wire, so that the fixed terminal plate 1 is interposed between the middle piece 3 and the upper piece 4. Reference numeral 10 denotes a horizontal hole bored in the right side piece T, through which the fixed terminal plate 1 is connected.

11 is a hole bored in the middle piece 3.

Reference numeral 12 denotes a locking fitting, which includes a locking piece 13 that prevents the electric wire T from coming off, and a fixing piece 14 that is integrally formed with the locking piece 13 and sits on the lower piece 5.

In addition, a contact piece 15 is provided separately from the lock piece 13 to ensure stable contact with the electric wire T. The locking piece 13 and the contact piece 14 come out from the hole 11 of the middle piece 3. Reference numeral 16 denotes a spring interposed between the upper piece 4 and the fixed terminal plate 1, which may be either a coil spring or a plate spring.

Thus, the spring 16 and the locking fitting 12 are assembled by the bent pieces 8 and 9 of the upper and lower pieces 4 and 5 without being displaced. IT is a leaf spring that stands upright at the bottom of the lower piece 5, and is formed into a horizontal U-shape consisting of upper and lower pieces 18 and 19. This leaf spring 17 is stronger than the locking piece 13. Therefore, the electric wire T
When the lock piece 13 is thin, the bending force of the lock piece 13 and the spring 16 is used to cope with the bending force, and when it is thick, the plate spring 17 is used to prevent the lock piece 13 from springing back. 20 is an insulating body to which the fixed terminal plate 1 is fixed; 21 is an insertion opening for a screwdriver or the like drilled in the body 20 to push down the upper piece 4;

22 is an insertion hole for the electric wire T, and 23 is a terminal chamber in which the S-shaped movable terminal frame 2 and the leaf spring 17 are housed.

Next, to describe the wire connection order of the screwless terminal device of the present invention, FIG. 1 shows a state in which the wire T is not inserted, and the wire T is then inserted between the fixed terminal fitting 1 and the middle piece 3.

In this case, the upper piece 4 of the S-shaped movable terminal frame 2 is pushed down with the tip of a screwdriver, as shown in FIG.

At this time, the lock fitting 12 is also pushed down, allowing the electric wire T to be inserted.

The rear movable terminal frame 2 is elastically returned upward by the spring 16, and the middle piece 3 is in contact with the other side Tb of the electric wire T, and the one side Ta is in contact with the fixed terminal plate 1. Further, the locking piece 13 is prevented from coming off by rising. Therefore, both sides Ta and Tb of the electric wire T come into contact with the fixed terminal plate 1 and the middle piece 3, which are relatively wide and stable, and do not rely only on the locking piece 13. At this time, the spring 16,
Since the locking fitting 12 holds the movable terminal frame 2 by the S-shaped upper, middle and lower pieces 4, 3, and 5, it will not pop out even when it is moved up and down. Furthermore, if the electric wire T is thick, the lower leaf spring 17 will bend to accommodate this. As described above, the present invention includes a movable terminal frame 2 facing separately from the fixed terminal plate 1, and a spring 16 other than the locking fitting 12 acting on the movable terminal frame 1 to lock the electric wire. Since both sides Ta and Tb of the T are held between both sides 1 and 2, the electric wire T does not wobble up and down around the lock piece, unlike in the case where the contact of the side Tb was shared only with the lock piece. The contact is stable and is not significantly affected by solid wires or flammable wires, and if the movable terminal frame 2 is pushed down against the spring 16, the wire T can be easily attached and detached.

Furthermore, in the present invention, the movable terminal frame 2 is formed into an S-shape by the upper, middle, and lower pieces 4, 3, and 5, and the spring 16 and the locking fitting 12 are vertically placed vertically around the middle piece 3. The spring 16 and the locking fitting 12 are arranged in an orderly manner so that they do not catch on each other during operation, and are securely held by the three pieces 4, 3, and 5.

Furthermore, in the present invention, since the plate spring 17 is interposed between the lower piece 5 of the movable terminal frame 2 and the container body 20, the locking piece 1 is attached to the thin electric wire T.
3 corresponds to the diameter of the wire, and since the plate spring 17 bends to accommodate the thick electric wire, the locking piece 13 does not become springy and can adapt to the size of the wire diameter.

[Brief explanation of the drawing]

The drawings show one embodiment of the screwless terminal device of the present invention.
The figure is a sectional view, and FIGS. 2 and 3 are wire connection sequence diagrams. 1...Fixed terminal board, 2...S-shaped movable terminal frame, 3...Middle piece, 4...Top piece, 5
...Lower piece, 6,7...Side piece, 8,9.
...Song piece, 10...Horizontal hole, 11...
...hole, 12...lock fitting, 13...
Locking piece, 14... Fixed piece, 15... Contact piece, 16... Spring, 17... Leaf spring, 18... Lower piece, 19...Top piece, 20
...Vessel body, 21...Insertion port, 22...
...Wire insertion hole, 23...Terminal room, T...
····Electrical wire.

Claims (1)

[Claims] 1. An S-shaped movable terminal frame that is integrally formed with a fixed terminal plate that one side of the electric wire contacts, a middle piece that contacts the opposite side, and upper and lower pieces that are connected to this middle piece and the left and right side pieces. , a spring that is compressed between the upper piece and the fixed terminal plate and always presses the middle piece toward the fixed terminal plate; and a spring that allows insertion of the electric wire and prevents the electric wire from coming off after insertion. A lock fitting having a lock piece that has passed through the lock piece, a fixing piece that is integrated with the lock piece and sits on the lower piece, and further interposed between the lower piece and the insulating body, and the lock piece Made with a leaf spring with stronger spring force,
A screwless terminal device characterized in that a locking fitting is lowered along with an S-shaped movable terminal frame by pushing down the upper piece.