JPH1050367A - Terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal device with high reliability in which a displacement quantity of a chain lock spring is always constant and a decrease of a contact pressure of a wire is prevented. SOLUTION: This device is constituted, so as to bring a wire 4 into close contact with a terminal block 3 by means of elasticity of a chain lock spring 1 and detach the wire 4 at a touch of an operation. In this case, a release knob 8 is rotated around an axis vertical to a case bottom face, whereby the chain lock spring 1 can be pressurized on a bottom face 10 thereof. A through- hole for electric detection is provided for the release knob 8 or an end face of the release knob 8 is protruded or recesses on the case top face, whereby the actuation state thereof can be displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a terminal device of a type in which an electric wire is held by a lock spring used for a circuit breaker such as a circuit breaker for a wiring, a circuit breaker or the like and a switch. .

[0002]

2. Description of the Related Art As shown in FIGS. 23 and 24, a conventional terminal device of the type in which an electric wire is brought into close contact with a terminal plate by the elasticity of a lock spring having a lock hole for inserting an electric wire is shown in FIGS.
Locking spring 2 by pressing the upper surface of the
1 between the lock hole 22 and the terminal plate 23, and
4 and release the pressing by the tool to release the locking spring 2.
1 was restored to its elasticity, and the electric wire 24 was sandwiched between the lock hole 22 and the terminal plate 23.

However, in such a conventional terminal device, the wire 24 is attached and detached while pressing the locking spring 21 with a tool such as a screwdriver. If the tip of the locking spring 21 hits and continues to be pressed, the locking spring 21 is deformed and the elastic force is weakened, so that the contact pressure of the electric wire to the terminal plate 23 is reduced and the terminal portion generates abnormal heat. was there.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a highly reliable terminal device in which the amount of displacement of the locking spring is always constant and the contact pressure of the electric wire is prevented from decreasing. It was done for.

[0005]

SUMMARY OF THE INVENTION A terminal device according to the present invention, which has been made to solve the above-mentioned problems, has a terminal for bringing an electric wire into close contact with a terminal plate by the elasticity of a locking spring having a locking hole for inserting an electric wire. The device is characterized in that a release knob is provided which can be rotated about an axis perpendicular to the bottom of the case to press the locking spring to a position where the electric wire can be inserted. In the practice of the present invention, a symmetric inclined surface is formed on the bottom surface of the release knob, the rotation direction thereof is arbitrary, and a through hole for power detection is provided between the side surface of the release knob and the case. Various deformations such as providing the operation status by displaying the end surface of the release knob on the upper surface of the case, and displaying the operation status by color-coding the end surface of the release knob. Can be added.

[0006]

Next, preferred embodiments of the present invention will be described in detail. Each of the embodiments relates to a terminal device of a circuit breaker for wiring, but it goes without saying that the present invention can be applied to a device other than a circuit breaker for wiring.

[First Embodiment] In FIGS. 1 to 3, reference numeral 1 denotes a band-shaped spring provided with a lock hole 5 for inserting an electric wire below the front plate 2, into which the terminal plate 3 and the electric wire 4 can be loosely fitted. This is a locking spring made of a plate material. The locking spring 1 is fixed to the terminal plate 3 by welding, screwing, or pressing the locking spring itself with the lower end of the curved spring portion 6 following the rear portion of the front plate portion 2. 2 is always urged upward. The distal end of the terminal plate 3 facing the wire insertion port 7 provided in the case 20 is inserted into the lock hole 5, and the lower end of the lock hole 5 is always urged by the elastic force of the lock spring 1. The edge is pressed against the lower surface of the terminal plate 3.

Reference numeral 8 denotes a release knob provided on the upper surface of the case of the locking spring 1. As shown in FIG. 4, the release knob 8 has a large-diameter shaft portion 8a at a lower portion, and has a bottom surface 10 having an inclined surface. The release knob 8 is rotatably attached to a shaft hole 9 having an enlarged step provided in the case 20 as shown in FIG. 1, and a bottom surface 10 is in contact with the upper end of the front plate 2 of the locking spring 1. Note that a tool engagement hole for a driver or the like is formed on the upper end surface of the release knob 8.

When the release knob 8 is rotated about an axis perpendicular to the case bottom as shown in FIG. 2, the height at which the inclined bottom surface 10 of the release knob 8 contacts the locking spring 1 changes. Therefore, the locking spring 1 is pressed toward the case bottom surface to form a space between the locking hole 5 and the lower surface of the terminal plate 3. Then, the electric wire 4 is inserted into this space from the electric wire insertion port 7 provided in the case 20, and then the release knob 8 is rotated to the original position as shown in FIG. Is released, and the locking spring 1 is restored by its own elasticity to securely clamp the electric wire 4 between the lower end edge of the locking hole 5 and the lower surface of the terminal plate 3.

As shown in FIG. 4, the release knob 8 is connected to the lowest height position 10a and the highest height position 10b by 180 degrees.
° Install the release knob 8 with the tip of a driver etc.
By rotating the lock spring 1 by 180 °, the locking spring 1 is pressed and released. However, as shown in FIG. 5, an inclined surface may be provided on the bottom surface 10 of the release knob 8 symmetrically, and the release knob 8 may be rotated 90 ° in either direction. In each case,
Since the amount of displacement of the lock spring 1 by the release knob 8 is constant, there is no danger that the lock spring will be displaced excessively as in the prior art, and the contact pressure of the electric wire can be kept constant. Terminal device with a high height can be obtained.

[Second Embodiment] Next, FIGS.
The second embodiment shown in FIG.
In which a spiral inclined surface is formed. That is, the bottom surface 10 of the release knob 8 is formed as a spiral inclined surface as shown in FIG. 9, and the release knob 8 is rotated by 180 ° around an axis perpendicular to the bottom surface of the case, whereby the locking spring is turned. The upper end of the front plate 2 is pressed. In addition, as shown in FIG.
Pressing and releasing may be made possible by rotating by 0 °.

[Third Embodiment] In a third embodiment shown in FIGS. 11 to 15, a release knob 8 is rotated so that an end face thereof protrudes and retracts from the upper surface of a case. That is, as shown in FIG. 14, the release knob 8 has a bottom surface 10 of the large-diameter shaft portion 8a formed as a plane perpendicular to the rotation axis, and an upper surface 11 of the large-diameter shaft portion 8a formed as an inclined cam surface. is there. The cam surface is brought into contact with a guide projection 12 formed on a part of the enlarged step portion of the shaft hole 9.

For this reason, as shown in FIG.
When the lowermost surface portion 11a of the
The flat bottom surface 10 of the release knob 8 does not press the locking spring 1. Further, the release knob 8 is rotated as shown in FIG.
, The flat bottom surface 10 presses the locking spring 1 downward. When the release knob 8 is rotated again as shown in FIG. 13 after inserting the electric wire 4 into the lock hole 5, the electric wire 4 is securely held between the lower surface of the terminal plate 3 by the elasticity of the lock spring 1. Will be done.

In the third embodiment, the rotation of the release knob 8 causes the release knob 8 to move in the axial direction and to protrude and retract from the upper surface of the case. There is an advantage that the connection state of No. 4 can be easily viewed from the upper surface side of the case.

Fourth Embodiment A release spring 26 may be provided between the terminal plate 3 and the release knob 8 as shown in FIG. Base end 2 of this release spring 26
6a is fixed to the locking spring 1 or the terminal plate 3 by means of welding, screwing, or the like, and the tip portion 26b is in contact with the bottom surface 10 of the large-diameter shaft portion 8a of the release knob 8 and always has an appropriate elastic force. The release knob 8 is in contact so as to push it upward.
Thereby, when the release knob 8 is not pressing the lock spring 1, the release knob 8 is held at a fixed position without floating along the shaft hole 9 by the elastic force of the release spring 26. Can be. That is, as shown in FIG. 17, when the electric wire 4 is inserted and the upper end of the release knob 8 protrudes from the upper surface of the case, the electric wire 4 is securely fastened to the terminal plate 3.

Also, as shown in FIG.
When the upper end is not protruding, the bottom surface 10 of the release knob 8 is at the bottom dead center and the electric wire 4 is inserted, indicating that the tightening of the electric wire 4 is not completed. In other words, the worker can check the tightening state of the electric wire 4 by checking whether the release knob 8 projects on the upper surface of the case, and can prevent forgetting to tighten the electric wire 4. In addition, release spring 2
6, the release knob 8 is always at a position away from the locking spring 1 and the terminal plate 3, so that the release knob 8 is less affected by the heat generated by the locking spring 1 and the terminal plate 3, and is made of a general material that is not a heat-resistant material. There is no risk of deformation. The cam surface 11 of the release knob 8 may be provided symmetrically as shown in FIG. 14 or may be provided as shown in FIG.

In the third and fourth embodiments, the connection state is indicated by the state of the release knob 8 protruding and retracting from the upper surface of the case. The operation status may be displayed by color-coding two colors.

Fifth Embodiment In a fifth embodiment shown in FIGS. 19, 20, and 22, a through hole 13 for detecting electric power is provided between the side surface of the release knob 8 and the case 20. It is provided. A test after connection can be easily performed by inserting a test rod into the through hole 13 for electric test and bringing its tip into contact with the lock spring 1. Also, when the release knob 8 is rotated, the hole does not coincide with the hole on the case 20 side. By confirming this coincidence state, the connection state and the non-connection state can be confirmed from the appearance, and there is also an effect of preventing forgetting the connection. Also, as shown in FIG. 21, if the through hole 13 for electric power detection is provided at the center of the release knob 8, the space for the through hole 13 for electric power detection becomes unnecessary in the case 20, and the diameter of the upper end portion is correspondingly reduced. Can be increased. Therefore, since the tool locking hole can be made large, the meshing of the driver and the like is improved, and there is no possibility that the tool locking hole is damaged.

[0019]

As described above, the terminal device of the present invention rotates the release knob about an axis perpendicular to the bottom of the case, thereby pressing the locking spring to a position where the electric wire can be inserted. Therefore, the displacement of the locking spring is always constant, and there is no decrease in the contact pressure between the electric wire and the terminal plate.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing the first embodiment in different modes.

FIG. 3 is a partially cutaway front view showing the first embodiment in different modes.

FIGS. 4A and 4B are diagrams showing a release knob used in the first embodiment, wherein FIG. 4A is a front view and FIG. 4B is a side view.

5A and 5B are diagrams showing another example of the release knob used in the first embodiment, wherein FIG. 5A is a front view and FIG. 5B is a side view.

FIG. 6 is a partially cutaway front view showing a second embodiment of the present invention.

FIG. 7 is a partially cutaway front view showing the second embodiment in different modes.

FIG. 8 is a partially cutaway front view showing the second embodiment in different modes.

9A and 9B are views showing a release knob used in the second embodiment, wherein FIG. 9A is a front view and FIG. 9B is a side view.

FIGS. 10A and 10B are diagrams showing another example of the release knob used in the second embodiment, where FIG. 10A is a front view and FIG. 10B is a side view.

FIG. 11 is a partially cutaway front view showing a third embodiment of the present invention.

FIG. 12 is a partially cutaway front view showing the third embodiment in a different manner.

FIG. 13 is a partially cutaway front view showing the third embodiment in a different manner.

14A and 14B are diagrams showing a release knob used in the third embodiment, wherein FIG. 14A is a plan view, FIG. 14B is a front view,
(C) is a side view.

15A and 15B are diagrams showing another example of the release knob used in the third embodiment, wherein FIG. 15A is a plan view, FIG. 15B is a front view, and FIG. 15C is a side view.

FIG. 16 is a partially cutaway front view showing the fourth embodiment.

FIG. 17 is a partially cutaway front view showing a fourth embodiment in a different manner.

FIG. 18 is a partially cutaway front view showing the fourth embodiment in different modes.

FIG. 19 is a plan view showing a fifth embodiment of the present invention.

FIG. 20 is a partially cutaway front view showing the fifth embodiment.

FIG. 21 is a diagram showing a fifth embodiment, and FIG.
Is a top view, and (B) is a sectional view.

FIGS. 22A and 22B are diagrams showing the fifth embodiment in different modes, wherein FIG. 22A is a top view and FIG. 22B is a cross-sectional view.

FIG. 23 is a partially cutaway front view showing a conventional example.

FIG. 24 is a partially cutaway front view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Locking spring 2 Front plate part 3 Terminal plate 4 Electric wire 5 Locking hole 6 Curved spring part 7 Wire insertion port 8 Release knob 8a Large diameter shaft part 9 Shaft hole 10 Bottom surface 10a Minimum height position 10b Maximum height position 11 Cam Surface 12 Guide projection 13 Electric detection through hole 20 Case 21 Lock spring 22 Lock hole 23 Terminal plate 24 Electric wire 25 Base bottom 26 Release spring

Claims (5)

[Claims] 1. A terminal device in which an electric wire (4) is brought into close contact with a terminal plate (3) by the elasticity of a locking spring (1) having a locking hole (5) for inserting an electric wire. A terminal device provided with a release knob (8) which can press the locking spring (1) to a position where an electric wire can be inserted by rotating around a proper axis. 2. The terminal device according to claim 1, wherein an inclined surface is formed on a bottom surface of the release knob. 3. The terminal device according to claim 1, wherein a through hole for voltage detection is provided between a side surface of the release knob and the case. 4. The terminal device according to claim 1, wherein an operation state of the release knob can be displayed by protruding and retracting an end face of the release knob on an upper surface of the case. 5. The terminal device according to claim 1, wherein an operation state of the release knob can be displayed by color-coding an end face of the release knob.