JPH0129968Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a switch with a fuse that opens and closes by rotating a fuse cylinder, and particularly eliminates the need for a trip lever that releases the lock of a tripping device when the fuse blows. This relates to the structure of something that prevents such movement.

[Prior art]

Figures 1 and 2 are front and side views, respectively, showing the closed circuit state of a fuse-equipped switch equipped with a conventional fuse tripping device of this type, and Figures 3 and 4 are enlarged views of the main parts thereof. be. In the figure, 1 is a base made of metal, 2 and 3 are support insulators fixed to the base 1, 4 is a power supply side terminal fixed to the upper end of the support insulator 2, and 5 is a load fixed to the upper end of the support insulator 3. side terminal, 6 is a fixed main contact electrically connected to the power supply side terminal 4, 7 is a movable main contact configured to be able to come into contact with and separate from the fixed main contact 6, 8
and 9 are a fixed arc contact and a movable arc contact that are disposed in the arc extinguishing chamber 10 so as to be able to approach and separate from each other, and are electrically connected to the fixed main contact 6 and the movable main contact 7, respectively. Reference numeral 11 denotes clips 13 fixed to both ends of the insulating support plate 12.
and 14, the clip 13 is electrically connected to the movable main contact 7, and the clip 14 is connected to the hinge 15 described later.
It is electrically connected to the load side terminal 5 via. The insulating support plate 12 is pivotally attached to a hinge 15 as a support member fixed to the upper end of the support insulator 3 by a pin 15a, and connected to a tripping device (not shown) via an insulating link 16. 17 is a latch that locks the opening driving force of the tripping device;
By releasing the latch 17, the fuse tube 11 mounted on the insulating support plate 12 is rotated counterclockwise in FIG. 2, and becomes in the open state shown at A. Note that in the energized state, the current flows through the power supply side terminal 4.
- Fixed main contact 6 - Movable main contact 7 - Clip 13 - Fuse tube 11 - Clip 14 - Hinge 15 - Load side terminal 5.

18 is a striker pin configured to protrude from the lower end of the fuse tube 11 when the fuse is blown; 19 is a trip lever that transmits the protruding force of the striker pin 18; as shown in FIG. It is pivoted to the support plate 12, and its tip is pivoted to the trip link 20 by a pin 19b, which in turn is connected to the trip shaft 21.
and is connected to the latch 17 via a connecting link 22. The latch 17 is released from the latch 17 by protrusion of the striker pin 18. In this case, the pin 15a and the pin 19b are configured to be coaxial as shown in FIGS. 3 and 4. Reference numeral 23 denotes a micro switch for displaying the fuse operation which operates in conjunction with the connecting link 22, and when the fuse is blown, the fuse operation is displayed until the fuse tube 11 is removed. Further, the micro switch 23 may be arranged at the trip link 20 or the trip shaft 21 in some cases.

The opening operation of the conventional fuse-equipped switch constructed as described above will be explained with reference to the drawings. FIG. 5 shows the opening operation under normal conditions (when the fuse is not operating).
That is, even if the fuse cylinder 11 is opened, the pin 1
5a and the pin 19b are arranged coaxially, so that the trip link 20 does not move. FIG. 6 shows the circuit opening operation by blowing the fuse. That is, the striker pin 18 protrudes and rotates the trip lever 19 counterclockwise around the pin 19a, driving the trip link 20, releasing the latch 17 via the trip shaft 21 and the connecting link 22, and releasing the micro switch 23. make it work.

Then, the fuse tube 11 is rotated by the tripping device to open the circuit.

However, in the conventional fuse-equipped switch as described above, during the circuit opening operation shown in _FIG . A force is applied to rotate the trip link 20, the trip shaft 21, and the connecting link 22 as an impact force, making it necessary to provide each of these members with extra strength. Also, as mentioned above, the trip lever 19 may move instantaneously, so this causes the micro switch 2 to
3 may operate, for example, if a self-holding circuit is provided in the control circuit, micro switch 2 may operate.
Is the display caused by the operation in step 3 due to normal opening/closing?
It becomes difficult to determine whether the fuse is blown or not, and it is necessary to install a timer or the like for this determination, which has the disadvantage that the switch as a whole becomes complicated and expensive.

[Summary of the idea]

This invention was made in order to eliminate the drawbacks of the conventional ones.In addition to providing a stopper on the support member, a retaining plate that engages with the stopper and restrains the trip lever only during normal circuit opening operation is attached to the trip lever. By providing
The object of the present invention is to provide a switch with a fuse that can prevent unnecessary movement of a trip lever.

[Example of idea]

Hereinafter, a fuse-equipped switch according to an embodiment of this invention will be described with reference to the drawings. Figure 7 is an enlarged view showing this main part.
Those with the same symbols as those in the drawings have the same contents as in the conventional case, and their explanation will be omitted. 24 is a stopper provided protruding from the hinge 15, and 25 is a substantially triangular foot plate fixed to the trip lever 19, which engages with the stopper 24 during normal opening operation as shown in FIG. 19 is configured to prevent it from rotating counterclockwise about the pin 19a. FIGS. 8 to 10 are enlarged views of the main parts, respectively, to explain the above situation. FIG. 8 shows a normal circuit opening operation, and the trip lever 19 has an inertial force as shown in the figure, with the pin 19a as the axis.
F ₁ occurs, and it attempts to rotate counterclockwise around the pin 19a. However, since the lever plate 25 is engaged with the stopper 24, the inertia force F ₁ of the trip lever 19 in the counterclockwise direction about the pin 19a is
rotation is prevented. Figure 9 shows the situation when the fuse blows and the striker pin 18 protrudes; in this case, the trip lever 19
rotates in the counterclockwise direction, and the attachment plate 25 moves away from the stopper 24. As a result, as shown in FIG.
does not engage with the stopper 24 and the trip lever 19
The movement of the foot plate 25 is not restricted by the foot plate 25. Therefore, unnecessary impact force is not transmitted to the trip link 20, trip shaft 21, and connecting link 22 during normal opening/closing operations, and there is no need to provide extra strength as long as the trip link 20, trip shaft 21, and connecting link 22 have the strength to withstand the opening operation due to fuse blowing. . In addition, since the micro switch 23 does not perform unnecessary operations, even when combined with a self-holding circuit, it is possible to clearly distinguish whether the display indicates normal opening/closing or a blown fuse. Both have the effect of being simple and inexpensive as a switch.

[Effect of idea]

In this invention, as explained above, a stopper is provided on the support member, and a retaining plate is provided that engages with the stopper and restrains the trip lever only during normal circuit opening operation, thereby preventing unnecessary movement of the trip lever and closing the switch. The overall effect is that it is simple and inexpensive.

[Brief explanation of drawings]

1 and 2 are a front view and a side view, respectively, showing the closed state of a fuse-equipped switch equipped with a conventional fuse tripping device; FIGS. 3 and 4 are enlarged views of the main parts; Fig. 6 and Fig. 6 are explanatory diagrams showing the opening operation during normal operation and when the fuse is blown, respectively, Fig. 7 is an enlarged view of the main part of the fuse-equipped switch in one embodiment of this invention, Fig. 8 and Fig. 9 1st
FIG. 0 is an explanatory diagram showing the circuit opening operation of FIG. 7 in a normal state and when a fuse is blown, respectively. In the figure, 11 is a fuse cylinder, 15 is a hinge as a support member, 18 is a striker pin, 19 is a trip lever, 24 is a stopper, and 25 is an attaching plate. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] The fuse tube is rotatably supported on the support member and rotated at a predetermined angle to open and close.The fuse tube is rotatably supported by the fuse tube of the switch with a fuse, and is attached by a striker pin that protrudes from the fuse tube when the fuse is blown. The device is equipped with a trip lever that is actuated to release the lock of the tripping device and open the fuse tube, and the support member is provided with a stopper, and the stopper is connected to the stopper during normal opening operation that does not involve blowing out the fuse. By providing a retaining plate on the trip lever that engages to restrain the trip lever with the fuse tube and does not engage with the stopper during the opening operation based on blowing the fuse, the inertia force during the opening operation of the fuse tube is reduced. A switch with a fuse, characterized in that it prevents unnecessary movement of the trip lever due to