JPS6362850B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a first toggle mechanism configured as a telescopic lever consisting of two parts, with an opening/closing spring provided between the two parts, and rotatably supported.
A spring-loaded quick opening/closing mechanism for a low-voltage switch having a lever and a second lever formed as a rotary operating part, the coupling means between these levers being formed as a slotted link mechanism for a contact driver. Involved.

This type of spring-type quick opening/closing mechanism is provided with a joint portion with play, which is comprised of a dog provided on the drive portion and a stopper provided on the toggle lever with which the dog can engage. The coupling portion is configured such that the driving portion and the driven portion are firmly coupled at least at the end of the opening range. In this case, the size of this end region must be selected in such a way that the required distance between the contacts is guaranteed during forced opening. Apart from the fact that in this known mechanism there is a strong connection only in the direction of the poles, this opening/closing mechanism is relatively expensive.

Therefore, it is an object of the present invention to provide an opening/closing mechanism of the type mentioned above, which guarantees a strong connection between a driving part and a driven part in both opening and closing directions with a simple configuration. . This object is easily achieved if the coupling means between the levers described above consist of a slot provided in the second lever and a pin provided in the first lever.

The opening and closing mechanism is further simplified when the pin is inserted into a slot in the contact driver and the contact driver is a slide. For still further simplification, the opening/closing spring is designed to simultaneously press the operating handle into the end position, and the additional spring is omitted. Both slots are configured so that the ends of the two slots can be overlapped only by the opening/closing spring when the rotary operation section is turned to the maximum extent, and the shape of the slot provided in the contact driver is adjusted so that the end portions of the two slots overlap in the closing direction. The contact driver is driven by the pin after the toggle mechanism reaches the dead center, and the contact driver is driven by the pin in the opening direction before the toggle mechanism reaches the dead center. With this configuration, it is possible to avoid closing the contact when the opening/closing spring is damaged and preventing the opening from becoming impossible when the contact is opened. This safety in opening and closing operations is achieved without practically increasing expenditure. In order to form the wall of the case relatively thin, that is, to prevent the load of the opening/closing spring from being applied to the case, the bearing support portions of both levers are provided on a support plate supported by bearings on the rotary operation portion. is good. Furthermore, it is advantageous to provide a stop for limiting the travel of the pin via this support plate. If a spring elastic body is provided between the pin and the stopper, the load on the opening/closing spring can be further alleviated. If the slot of the slider is mainly formed by a slit-shaped hole extending in an arc shape around the rotary operation part, and a rectangular enlarged part is provided on the side opposite to the rotation operation part of the hole, the special shape of the slot of the slider can be improved. An advantageous shape can be obtained. In order to obtain a good coordinated movement of both slots, the slot of the second lever should be formed by a slit-like hole extending approximately in an arc shape around the rotary operating part in the area of the rectangular enlarged part of the slot of the slider. That's good.

Next, one embodiment of the present invention will be described in detail based on the drawings.

The fuse-equipped motor switch shown in FIGS. 1 to 3 includes three low-voltage, large-capacity fuses 1 held at mounting contacts 2. Mounting contact 2 is bolt 4
are interconnected with fixed contacts 3, which can each be sandwiched between two rollers 5 forming movable contacts. The rollers 5 are provided on both sides of a slide 6 slidably guided in the case 7 and connect the inlet terminal 8 and the outlet terminal 9. In order to move this slider 6, a spring-type quick opening/closing mechanism provided in the case 7 shown in FIG. 4 is utilized. A tube 11 forming an operating shaft is rotatably supported by a bearing on the case 7 or a support plate 10 held in the case 7, and a lever 12 forming a rotary operating section is fixed onto this tube. A square shaft 13 is held within the tube 11 via a clamp 14 for extending the operating shaft. A pin 16 is inserted through the slot 15 of the lever 12, which is formed by a slit-shaped hole extending in an arc shape with the rotation operation portion as the center. Slot 15 is bulge 1
7, so both ends are thick and the center has a thin part 18
A pin 16 with a
5 and is prevented from moving in the axial direction beyond this bulge. The narrow portion 18 of the pin 16 is further inserted through the slot 19 of the slider 6. The shape of slot 19 is particularly
As shown in the figure. The slot 19 mainly consists of a portion extending in an arc shape around the tube 11 of the rotary operating section and an enlarged portion 20 provided on the opposite side of the tube. A slider 6 equipped with a movable contact 5 is driven using both corners of the enlarged portion 20. Here, both corners of the slot 19 of the slider 6 are arranged such that the slider 6 is driven only after the toggle mechanism reaches the dead center in the closing direction and until the toggle mechanism reaches the dead center in the opening direction. Designed. In the closing direction, the slider 6 is accelerated by the opening/closing spring 21 regardless of manual operation.
In the contact opening direction, by forcibly driving the slider 6 until it reaches the dead center, even if the contacts happen to be welded together, they can be pulled off by hand. A lever 22 that includes an opening/closing spring 21 in the toggle mechanism is movable relative to a U-shaped holder 24 with a guide tube 25 rotatably supported by a bearing on the support plate 10 via a pin 23. and a holder 26 for the opening/closing spring 21 which is guided by the pin 16 and rotatably supported by a bearing. As shown in FIG. 4, two holders 26 are provided for the two opening/closing springs 21 that act in parallel on the slide 6. A stopper 27 fixed to the case is used as a rotation limiting stopper for the lever 12, but the stopper can also be provided on the support plate 10. A spring elastic body, for example a bar spring 32 bent at right angles, is further fixed on the support plate 10, for example by means of a projection 33. The ends 34, 35 of the bar spring 32 project into the end region of the arcuate travel-limiting slot 36 of the support plate 10 and thus dampen the end of the movement of the pin 16 in the closing and opening directions.

In order to realize the function of the spring-type quick opening/closing mechanism according to the present invention, the operation is performed as follows.
In the closed position shown in FIG. 5, the fixed contact 3 is in contact with the roller 5. When the tube 11 is turned counterclockwise, the lever 12 moves away from the stopper 27. Since the pin 16 rests on the edge 28 of the slot 15, the pin 16 is moved along an arc in the slot 19 of the slider 6. At this time, the opening/closing spring 21
is compressed by the receiver 26 toward the U-shaped holder 24, so that the lever 22 is shortened in length and the pin 2
3, and finally the toggle mechanism reaches its dead center as shown in FIG. Here, the pin 16 reaches the right corner 29 of the slot 19, so when the pin 16 moves further, the slider 6 is suddenly driven by the repulsion of the opening/closing spring 21, and the rotary handle (not shown), which is firmly connected to the tube 11, is moved. When held stationary, the fixed contact 3 assumes the position shown in FIG. 7 relative to the roller 5. At this time pin 1
6 has already reached the arcuate portion of the slot 19. However, if you turn the operation part further, pin 16
is in contact with the edge 28, so the pin 16 and therefore the roller 5
comes to the position shown in FIG. This position is a forced opening position when the opening/closing spring 21 is broken. The final opening position is shown in FIG. At this time, the opening/closing spring 21 completes the movement of the rotating handle to the open position via the pin 16 and the edge 30 of the rod 15 without moving the slider 6 any further.
The pin 16 at the same time rests against the terminal edge 31 of the slot 19. However, the restriction of movement for the pin 16 can also be effected by holes in the support plate 10.

To close the pole, first, by rotating the tube 11 clockwise, the lever 22 is compressed in a telescopic manner, and the opening/closing spring 21 is compressed until it reaches the dead center shown in FIG. 10. At this time, the edge 30 of the slot 15 drives the pin 16. FIG. 11 shows the contact position where the roller 5 is in contact with the fixed contact 3 when the rotary handle is held stationary and the opening/closing spring 21 moves the pin 16 until it abuts the edge of the slot 15. Movement of the slider 6 has already been carried out. The forced contact position when the opening/closing spring 21 is damaged is shown in FIG. At this time, pin 1
6 moves against the edge 30 of the slot 15. The movement of the lever 12 is restricted by coming into contact with the stopper 27. If the opening/closing spring 21 is fully intact, the slide 6, lever 22 and pin 16 move to the closing position shown in FIG. Referring to FIGS. 12 and 8, the switch according to the present invention has a switching spring 2.
It can be seen that it has adequate safety even if 1 is damaged. In other words, if the opening/closing spring is damaged, slow closing, which would normally cause damage to the switch itself, will be prevented.
In addition, failure to open the electrodes, which could pose a danger to humans in an emergency, is prevented.

[Brief explanation of drawings]

Fig. 1 is a plan view of a fuse-equipped electric motor switch equipped with a spring-type quick opening/closing mechanism showing one embodiment of the present invention; Fig. 2 is a sectional view taken along the cutting line of the switch shown in Fig. 1; 3 is a sectional view taken along the cutting line of the switch shown in FIG. 1, FIG. 4 is a sectional view of a portion of the spring-type quick opening/closing mechanism, and FIG. 5 is a plan view of the spring-type quick opening/closing mechanism in the closed position. Figure 6 is a schematic diagram of the slotted link mechanism when the pin reaches the dead center of the toggle mechanism in the opening direction, and Figure 7 is a schematic diagram of the toggle mechanism when the toggle mechanism opens and closes with the rotation handle held in the position shown in Figure 6. Figure 8 is a schematic diagram of the slotted link mechanism when the opening/closing spring is damaged and the slotted link mechanism is forcibly opened. A plan view of the opening/closing mechanism, Fig. 10 is a schematic diagram of the slotted link mechanism when the pin reaches the dead center of the toggle mechanism in the closing direction, and Fig. 11 shows the rotary handle held in the position shown in Fig. 10. FIG. 12 is a schematic diagram of the slotted link mechanism when the toggle mechanism is reversed by the opening/closing spring, and FIG. 12 is a schematic diagram of the slotted link mechanism showing a state where the pole cannot be closed when the opening/closing spring is damaged. In addition, in FIGS. 5 to 12, the positions of the movable contacts relative to the fixed contacts are shown at the bottom. In the figure, 3 is a fixed contact, 5 is a movable contact (roller), 6 is a contact driver (slide), 10 is a support plate,
12 is a second lever, 15 is a slot, 16 is a pin, 19 is a slot, 20 is an enlarged portion, 21 is an opening/closing spring, 22 is a first lever, 23 is a spring elastic body (arcuous spring), 27 is a stopper, It is.

Claims (1)

[Claims] 1. The toggle mechanism is configured as a telescopic lever consisting of two parts, a first lever provided with an opening/closing spring between the two parts and rotatably supported, and a second lever formed as a rotary operation part. In a spring-type quick opening/closing mechanism for a low-voltage switch, the coupling means between the levers is formed as a slotted ring mechanism for the contact driver, the coupling means having a second lever in a slot provided in the second lever. The second lever is configured by inserting a pin provided in the first lever, the pin is further inserted into a slot provided in the contact driver, and the slot of the second lever and the slot of the contact driver are connected to the rotation. When the operation part is turned to the maximum extent, the ends of both slots can be overlapped only by the opening/closing spring, and the shape of the slot provided in the contact driver is such that the end portions of the two slots can overlap each other only by the opening/closing spring. The contact driver is driven by the pin after the toggle mechanism reaches the dead center, and in the opening direction, the contact driver is driven by the pin before the toggle mechanism reaches the dead center. An opening/closing mechanism for a low voltage switch, characterized in that it is configured to be driven.