JPS647465B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a terminal device such as a plug that does not use a terminal screw and is used for connecting electric wires.

[Background technology]

Generally, this type of terminal device has a structure where a locking spring is simply inserted into the terminal board, so there is no problem when press-inserting hard wires such as solid wires, but when inserting thin conductor wires, there is no problem. A disadvantage of twisted wires, which are highly flexible, is that they cannot be used because they cannot spread the lock spring by themselves. Of course, if you hold down the unlock button and insert it, you will not be unable to connect even flexible wires, but this poses a problem in that the connection operation is not easy and the merits of a screwless terminal device are lost.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and its object is to provide a screwless terminal device that can easily connect even flexible electric wires such as stranded wires.

[Disclosure of the invention]

In the terminal device according to the present invention, the lower surface of the horizontal piece 13 of the unlock button 12 having an inverted L-shaped cross section and the upper surface of the front and rear protrusions 16a and 16b protruding from the inner surface of the vertical piece 14 are connected to the terminal board. The lock spring 7 having an S-shaped bent part 9 in the front half and a U-shaped folded part 8 in the rear half is slid onto the upper and lower surfaces of the upper horizontal piece 2 having a U-shaped cross section. When the unlock button 12 is slid forward, the rear protrusion 16b compresses the folded part 8, and the front protrusion 16a climbs over the chevron-shaped top 11 of the S-shaped bent part 9. teS
When the character-shaped bent portion 9 is compressed and the unlock button 12 is slid backward, the electric wire 1 inserted from the rear
7 is locked by the tip of the folded portion 8, and when the unlocking button 12 is slid forward, the front protrusion 16a engages with the chevron of the S-shaped bent portion 9 of the lock spring 7. When the terminal board 1 and the unlocking button 12 are over the top 11, the frictional force generated between the terminal board 1 and the unlocking button 12 becomes larger than the rearward component of the restoring force of the locking spring 7, and is applied to the unlocking button 12. Even if the operating force is removed, the unlocking button 12 remains stationary in that state, thereby making it possible to easily insert the flexible electric wire 17.

〔Example〕

The figure shows one embodiment of the present invention. In FIGS. 1 and 2, the terminal plate 1 is formed into a U-shaped cross section by an upper horizontal piece 2, a side wall 3, and a lower horizontal piece 10. The horizontal piece 2 serves as a guide for the unlock button 12 at the front (arrow)
A protrusion 6 provided at the base of the plug blade 5 is caulked and fixed to a hole 4 bored in the side wall 3, and the terminal plate 1 and the plug blade 5 are integrated. There is. The lock spring 7 inserted into the U-shaped cross section of the terminal plate 1 has an S-shaped bent part 9 formed in the front half and an S-shaped folded part 8 in the rear half. The elasticity of the S-shaped bent portion 9 holds the electric wire 17 in the U-shaped cross section, and the tip edge of the folded portion 8 locks the electric wire 17 inserted from the rear.

The unlock button 12 has an inverted L cross section with a horizontal piece 13 and a vertical piece 14.
The upper surfaces of the front protrusion 16a and rear protrusion 16b protruding from the inner surface of the vertical piece 14 are formed on the lower surface of the upper horizontal piece 2 of the terminal plate 1 and on the lower surface of the horizontal piece 13. The two ribs 15 are in sliding contact with the upper surface of the upper horizontal piece 2 of the terminal board 1, respectively, and can be slid by hand along the upper horizontal piece 2 of the terminal board 1.

When the unlocking button 12 is now slid backward, the unlocking button 12 and the locking spring 7 are separated as shown in FIG.
do not engage with each other, and the S-shaped bent portion 9 of the locking spring 7
is elastically held between the upper and lower horizontal pieces 2 and 10 of the terminal board 1, and the tip of the folded part 8 locks the electric wire 17 inserted from the rear, and the unlocking button 12 is slid forward. In this state, as shown in FIG. 3, the rear protrusion 16b compresses the folded part 8 downward and forward, and the front protrusion 16a climbs over the chevron-shaped top 11 of the S-shaped bent part 9 to form an S-shaped bend. Even if the part 9 is compressed downward and rearward and the hand that was pressing the unlock button 12 forward is released in this state, the unlock button 12 remains in the same position due to the frictional force with the terminal board 1, that is, in the unlocked state. It is locked at. Therefore, even a highly flexible electric wire 17 such as a stranded wire can be easily inserted between the upper horizontal piece 2 of the terminal board 1 and the tip of the folded portion 8 of the lock spring 7. Also, unlock button 1
The wire insertion confirmation holes 18 provided in the horizontal piece 13 of 2 and the upper horizontal piece 2 of the terminal board 1 are facing each other in the unlocked state, and it is confirmed whether the electric wire 17 is inserted to the predetermined position. can do. After inserting the wire, by returning the unlock button 12 to its original position,
The electric wire 17 is connected to the tip edge of the folded portion 8 and the upper horizontal piece 2.
Terminal board 1
It is firmly connected to the terminal. Note that the rear plate 19 of the terminal plate 1 is provided with a conductor insertion hole 20 having a diameter larger than the conductor diameter of the covered electric wire 17 and smaller than the covering diameter,
This prevents the insulating coating from penetrating into the terminal board 1, thereby preventing incomplete connection.

The terminal board 1, the lock spring 7, and the unlock button 12 are housed in the upper and lower casings 21 and 22 as shown in FIG. 2, but as shown in FIG.
When the unlock button 12 is slid forward, a safety protrusion 23 formed on the inner surface of the upper casing 22 engages with a safety rib 24 protruding from the front end of the unlock button 12. However, for this reason, the upper and lower casings 21 and 22 cannot be fitted together, thereby preventing the plug from being used in a state where the electric wire 17 is not securely locked.

〔Effect of the invention〕

As described above, the terminal device according to the present invention has an unlocking button with an inverted L-shaped cross section that slides back and forth while being guided by the upper horizontal piece of the terminal plate with a U-shaped cross section, and an S-shaped bent portion of the front half of the lock spring. A front protrusion that compresses the lock spring and a rear protrusion that compresses the U-shaped folded portion of the rear half of the lock spring are provided.
When the unlock button is slid forward, the front protrusion passes over the chevron-shaped top of the S-shaped bent part and compresses the S-shaped bent part, and when the unlock button is slid backward, it is inserted from the rear. Since the tip of the folded wire is locked, the front protrusion of the unlocking button must pass over the top of the chevron of the S-shaped bent portion of the lock spring to connect the terminal board to the unlocking button. The frictional force between the buttons is greater than the restoring force of the lock spring, and the unlock button stays at the unlocked position even when no hand is placed on it, so the electric wire can be inserted without the resistance of the lock spring. This has the advantage that highly flexible electric wires such as stranded wires can be connected to the screwless terminal device, which conventionally could only use hard electric wires such as solid wires.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
FIG. 2 is a longitudinal cross-sectional view showing the assembled state, and FIG. 3 is a longitudinal cross-sectional view showing the unlocked state. 1 is a terminal board, 2 is an upper horizontal piece, 3 is a side wall, 7 is a locking spring, 8 is a folded part, 9 is an S-shaped bent part, 11 is a top part, 12 is an unlock button, 13 is a horizontal piece, 14 is a vertical piece piece,
16a is a front protrusion, 16b is a rear protrusion, 17 is an electric wire,
18 is a hole for confirming the insertion of electric wires.

Claims (1)

[Scope of Claims] 1. The lower surface of the horizontal piece of the unlock button having an inverted L-shaped cross section and the upper surface of the front and rear projections protruding from the inner surface of the vertical piece are connected to the upper and horizontal parts of the U-shaped cross section of the terminal board. It slides on the top and bottom surfaces of each piece, and has an S-shaped bent part in the front half and a U-shaped part in the second half.
When a lock spring having a folded part is inserted into a U-shaped cross section and the unlock button is slid forward, the rear protrusion compresses the folded part and the front protrusion bends into an S-shape. When the S-shaped bent part is compressed by climbing over the top of the chevron of the part and the unlock button is slid backward, the tip of the folded part locks the electric wire inserted from the rear. terminal device. 2. Claim No. 2 characterized in that the horizontal piece of the unlocking button and the upper horizontal piece of the terminal board are provided with holes for confirming the insertion of electric wires, which face each other when the unlocking button is slid forward. Terminal device according to item 1.