JPH06196046A - Operating mechanism for switch - Google Patents

Abstract

PURPOSE:To facilitate assembling of a switch mechanism for attaching an opening/closing spring while pulling it into a case. CONSTITUTION:In an operating mechanism, an opening/closing spring 22 is linked between one end of a lever 12, supporting the other end by a supproting shaft 11, and a center pin 20 of a toggle link 19. A U-shaped bearing groove 27 is formed in an end part of the lever 12 supported by the supporting shaft 11, and the lever 12 is supported on the supporting shaft 11 through this bearing groove 27. At building time, after fitting all the other shaft 9, 14, 17 to a case formed of a case main unit 7 and a cover plate 8, since the opening/closing spring 22 is extended to only require the bearing groove 27 fitted together to the supporting shaft 11, assembling work is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating mechanism for a switch such as a vacuum circuit breaker, and more particularly to an improvement for facilitating the assembling work thereof.

[0002]

2. Description of the Related Art FIG. 5 is a perspective view showing the appearance of a manually operated vacuum circuit breaker equipped with an operating mechanism which is the subject of the present invention.
FIG. 6 is a side view showing the main part of the operating mechanism in the direction of arrow A in FIG. 5. In FIG. 5, the vacuum circuit breaker comprises an opening / closing section 1 and an operating section 2. The opening / closing section 1 is provided with a vacuum valve 3 for opening / closing a three-phase main circuit for each phase. 5 is pulled out. The vacuum valve 3 is turned on / off by rotating the operation handle 6 of the operation unit 2 by 90 degrees between a closing position indicated by a solid line and a reset / interruption position indicated by a chain line. The operation unit 2 has a configuration in which an operation mechanism shown in FIG. 6 is housed inside a case composed of a box-shaped case body 7 having an open front side in FIG. 5 and a cover plate 8 closing the opening. ing.

In FIG. 6, one end of an operation lever 10 is fixed to an operation shaft 9 which is rotated by an operation handle 6, and the other end of a lever 12 rotatably supported by a support shaft 11 and the operation lever. The other end of 10 is connected via a link 13. Further, between the stopper 16 having one end rotatably supported by the support shaft 14 and the other end locked by the latch 15, and the output lever 18 rotatably supported by the support shaft 17 at the substantially central portion. A toggle link 19 is provided. Both ends of the opening / closing spring 22 are hooked on a center pin 20 connecting the upper link 19a and the lower link 19b of the toggle link 19 and a pin 21 connecting the lever 12 and the link 13, respectively.

The lever 12 has a gate shape in which the left and right arms 12a are connected at the upper end, and sandwiches the stopper 16 and the toggle link 19 from both sides, and the spindle 11 penetrating the tip of the arm 12a.
Are cantilevered on the case body 7 and the cover plate 8 separately on the left and right sides. On the other hand, the operating shaft 9, the support shaft 14,
The support shaft 17 penetrates the case, and both ends thereof are supported by the case body 7 and the cover plate 8, respectively. On the other hand, an opening / closing shaft 23 is rotatably supported by a bearing metal (not shown) at one corner of the opening / closing section 1 (FIG. 5), and the other end of an opening / closing lever 24 fixed at one end thereof is used to operate the vacuum valve 3. It is connected to the end. One end of the opening / closing shaft 23 extends into the operation portion 2,
The other end of the connecting lever 25, one end of which is fixed to this end, and the substantially central portion of the output lever 18 are connected via a link 26.

FIG. 6 shows the process of turning on the vacuum circuit breaker. When the operating handle 6 is further rotated counterclockwise in the figure, each part moves in the direction of the arrow and finally the vacuum valve 3 is reached.
The movable contactor (not shown) is pushed leftward to contact the fixed contactor. Further, when the operation handle 6 is turned clockwise by 90 degrees from the on state, each part moves in the direction opposite to the arrow, and the line of action of the force of the opening / closing spring 22 is changed to the upper link 1.
Toggle link 19 when 9a is passed from right to left in the figure
Then, the movable contactor of the vacuum valve 3 is rapidly separated from the fixed contactor. Furthermore, when an overcurrent is generated, the tripping device (not shown) is actuated to stop the stopper 1 by the latch 15.
6 is unlocked, and the stopper 16 opens and closes the opening / closing spring 22.
Is repelled in the clockwise direction in the figure with the support shaft 14 as a fulcrum. As a result, the toggle link 19 is reversed and the vacuum circuit breaker is turned off.

[0006]

In such a vacuum circuit breaker, the operation lever 10,
Lever 12, link 13, stopper 16, output lever 1
8, the toggle link 19 and the opening / closing spring 22 are connected to each other in the state of FIG. 6 outside the case, and then brought into the case main body 7, and the operation shaft 9, the support shaft 11, the support shaft 14, and the support shaft 1 are provided.
One end of the shaft 7 is fitted into the hole of the case main body 7, then the cover plate 8 is assembled to the case main body 7, and the other end of each shaft is fitted into the hole.

However, in this type of operating mechanism, since the opening / closing spring 22 is mounted with a preload, one side of the operating mechanism is completely attached to the case body 7 as in the conventional case. When trying to assemble the other side to the cover plate 8, the opening / closing spring 22 must be stretched when the shafts are fitted into the cover plate 8, and the spring force becomes a heavy load, resulting in a very long time for assembly. There was a problem that it took. Therefore, an object of the present invention is to provide a switch operating mechanism that facilitates assembly work by allowing the open / close spring to be installed in the case in a loosened state.

[0008]

In order to achieve the above object, the present invention forms a U-shaped bearing groove at an end portion supported by a support shaft of a lever, and the lever is provided through the bearing groove. The support shaft is supported. In that case, if one of the legs sandwiching the bearing groove of the lever is made longer than the other,
Assembly work becomes easier.

[0009]

In the conventional structure, since the support shaft for supporting the lever penetrates through the end portion of the lever, when the support shaft is fitted into the case body, the fulcrum end portion of the lever is completely fixed to the case body to open and close. It causes a tensile force in the spring. Therefore, in the present invention, a U-shaped bearing groove is formed in the lever end portion supported by the support shaft, and the lever end portion is supported by the support shaft through the bearing groove. As a result, when the operating mechanism is assembled to the case, the lever end is first detached from the support shaft and the opening / closing spring is loosened, then the other shaft is fitted into the case, and finally the opening / closing spring is pulled while the bearing of the lever end It suffices to fit the groove to the support shaft, which makes the assembly work very easy. In that case, if one of the legs sandwiching the bearing groove is made longer than the other, the lever end can be aligned with the support shaft using the longer leg as a stopper, so the work of fitting the bearing groove to the support shaft is easy. Become.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention in a vacuum circuit breaker will be described below with reference to FIGS. Here, FIG. 1 is a side view of a main part of the operating mechanism, FIG. 2 is a partial sectional view taken along line II-II of FIG. 1, and FIG. 3 is a state in which a lever end of the operating mechanism of FIG. 1 is removed from a spindle. 4 and FIG. 4 are views for explaining how the lever end is fitted on the support shaft. The same reference numerals are used for the parts corresponding to the conventional example, and the mechanism from the output lever to the vacuum valve is omitted. In FIG. 1, a difference from the conventional example is that a U-shaped bearing groove 27 is cut out from the front end surface at the end of a lever 12 supported by a support shaft 11, and the lever 12 has a bearing groove 27 on the support shaft 11. The rest of the structure is the same as that of the conventional example in that it is rotatably supported by being fitted. One leg 12b sandwiching the bearing groove 27 is longer than the other leg 12c.
As shown in FIG. 2, the spindle 11 has a head portion 11a at one end,
The base end is held by the case body 7 and the cover plate 8 by appropriate means such as caulking or welding.

When the illustrated operation mechanism is assembled to the case, one end of the operation shaft 9, the support shaft 14 and the support shaft 17 is attached to the case main body 7 with the lever 12 removed from the support shaft 14 as shown in FIG. Then, the other end is fitted into the cover plate 8. If the lever 12 is removed from the support shaft 11, it is possible to fit the above-mentioned shafts with the opening / closing spring 22 left in a free state. After that, pulling the lever 12 in the direction of the arrow in FIG.
Further, as shown in FIG. 4, the bearing groove 27 is aligned and fitted to the support shaft 14. At this time, if the shorter leg 12c of the lever 12 crosses the support shaft 11 and then the longer leg 12b abuts on the support shaft 14, the bearing groove 27 easily faces the support shaft 11. be able to. An appropriate jig may be used to pull up the lever 12 against the open / close spring 22, and for example, the tip of a hook inserted through a small hole formed in the upper wall of the case body 7 may be hooked on the lever 12. A method of pulling this hook with a screw-type pulling tool can be adopted.

[0012]

As described above, according to the present invention, the lever end is supported by the support shaft through the U-shaped bearing groove, so that the force of the opening / closing spring is received except for the lever end. Instead, the operating mechanism can be assembled to the case, and finally the opening and closing springs of the lever can be extended and fitted to the support shaft, so that the operating mechanism can be easily assembled without applying excessive force to each part.

[Brief description of drawings]

FIG. 1 is a side view of a main part of an operating mechanism of a vacuum circuit breaker showing an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view taken along the line II-II of FIG.

FIG. 3 is a diagram showing a state in which a lever end portion of the operation mechanism of FIG. 1 is removed from a spindle.

FIG. 4 is a view showing how the lever end portion of the operation mechanism of FIG. 1 is fitted onto a spindle.

FIG. 5 is a perspective view showing an appearance of a vacuum circuit breaker.

6 is a side view of essential parts showing a conventional configuration of an operating mechanism in the vacuum circuit breaker of FIG.

[Explanation of symbols]

 3 vacuum valve 6 operation handle 7 case body 8 lid plate 9 operation shaft 10 operation lever 11 support shaft 12 lever 14 support shaft 15 latch 16 stopper 18 output lever 19 toggle link 20 center pin 22 opening / closing spring 23 opening / closing shaft 27 bearing groove 12b leg 12c leg

Claims (2)

[Claims] 1. A lever having a fulcrum that pivotally supports one end supported by a support shaft in conjunction with an operating lever that is opened and closed, and the other end of the lever and a center pin of a toggle link that drives a movable contact. In a switch operating mechanism in which an opening / closing spring is applied between the levers, a U-shaped bearing groove is formed at an end supported by a lever support shaft, and the lever is supported by the support shaft through the bearing groove. The operating mechanism of the switch, which is characterized by 2. The operating mechanism for a switch according to claim 1, wherein one of the legs sandwiching the bearing groove is configured to be longer than the other.