JP3079822B2 - Switch operation mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 5 is a perspective view showing the appearance of a manually operated vacuum circuit breaker having an operation mechanism to which the present invention is applied, and FIG.
FIG. 6 is a side view showing a main part of the operation mechanism from the direction of arrow A in FIG. In FIG. 5, the vacuum circuit breaker includes a switching unit 1 and an operating unit 2, and the switching unit 1 is provided with a vacuum valve 3 for opening and closing a three-phase main circuit for each phase. 5 has been 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 in FIG. The operation unit 2 has a configuration in which an operation mechanism shown in FIG. 6 is housed in 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 whose one end is rotatably supported by a support shaft 11 and an operation lever. The other end of 10 is connected via a link 13. A stopper 16 having one end rotatably supported by a support shaft 14 and the other end locked by a latch 15, and an output lever 18 whose substantially central portion is rotatably supported by a support shaft 17. A toggle link 19 is provided. Both ends of an opening / closing spring 22 are hung 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 left and right arms 12a are connected at the upper end, sandwiches a stopper 16 and a toggle link 19 from both sides, and a support shaft 11 penetrating the tip of the arm 12a.
Are cantilevered separately on the left and right sides of the case body 7 and the lid plate 8, respectively. On the other hand, the operation shaft 9, the support shaft 14,
The support shaft 17 penetrates the case, and both ends 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 (not shown) at one corner of the opening / closing section 1 (FIG. 5). It is connected to the end. One end of the opening / closing shaft 23 extends into the operation unit 2,
The other end of the connection lever 25, one end of which is fixed to this end, and the approximate center of the output lever 18 are connected via a link 26.

FIG. 6 shows a state in which the vacuum circuit breaker is turned on. When the operating handle 6 is further rotated in the counterclockwise direction in FIG.
The movable contact (not shown) is pushed leftward and comes into contact with the fixed contact. When the operating handle 6 is turned 90 degrees clockwise 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 changes to the upper link 1.
9a from right to left in FIG.
, And the movable contact of the vacuum valve 3 is quickly separated from the fixed contact. Further, when an overcurrent occurs, the tripping device (not shown) operates to activate the stopper 1 by the latch 15.
6 is released, and the stopper 16 is opened and closed by the open / close spring 22.
By the force of (1), it is flipped clockwise in FIG. Thereby, the toggle link 19 is inverted and the vacuum circuit breaker is turned off.

[0006]

In such a vacuum circuit breaker, when assembling the operation section 2, 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 outside the case in the state shown in FIG. 6 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
One end of the shaft 7 is fitted into a hole of the case body 7, and then the cover plate 8 is combined with the case body 7, and the other end of each shaft is fitted into the hole.

However, in this type of operating mechanism, the opening / closing spring 22 is mounted with a preload, so that one side of the operating mechanism is completely assembled to the case body 7 as in the conventional case. If the other side is to be assembled to the cover plate 8, the opening / closing spring 22 must be stretched when each of the shafts is fitted into the cover plate 8, and the spring force is a large burden, resulting in very short assembly time. There was a problem that it took. Therefore, an object of the present invention is to provide an opening and closing operation.
One end supported by a spindle in conjunction with the operating lever
Has a lever that pivots, and is in movable contact with the other end of this lever.
Opening and closing sprout between the center pin of the toggle link that drives
The operating mechanism of the switch with the ring
As it can be assembled to the case with the pulling loose
And to facilitate the assembly work.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to an end of a lever supported by a support shaft.
A U-shaped bearing groove is formed, and the lever is inserted through the bearing groove.
To the support shaft, and before the support shaft is sandwiched.
It is assumed that one leg of the lever is longer than the other leg .

[0009]

In the conventional construction, since the support shaft for supporting the lever penetrates the end thereof, when this support shaft is fitted into the case main body, the fulcrum end of the lever is completely fixed to the case main body and opened and closed. This causes a tensile force on the spring. Therefore, in the present invention, a U-shaped bearing groove is formed at the lever end supported by the support shaft, and the lever end is supported on the support shaft via the bearing groove. With this, when assembling the operating mechanism to the case, remove the lever end from the support shaft, loosen the opening / closing spring, fit the other shaft into the case, and finally pull the opening / closing spring while holding the lever end bearing. It is only necessary to fit the groove on the support shaft, and the assembling work becomes very easy. In this case, by making one leg of the lever sandwiching the support shaft longer than the other leg, the lever end can be aligned with the support shaft using the longer leg as a stopper. The work of fitting to the support shaft becomes easy.

[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 operation mechanism, FIG. 2 is a partial cross-sectional view along the line II-II in FIG. 1, and FIG. 3 is a state in which a lever end of the operation mechanism in FIG. FIG. 4 is a view for explaining how the lever end is fitted to the support shaft. The parts corresponding to those of the conventional example are denoted by the same reference numerals, and the mechanism from the output lever to the vacuum valve is omitted. In FIG. 1, the difference from the conventional example is that a U-shaped bearing groove 27 is formed by cutting out the end of the lever 12 supported by the support shaft 11 from the front end surface. The other configuration is the same as that of the conventional example in that it is rotatably supported by being fitted. In addition, a lever sandwiching the spindle 11
One leg 12b of over 12 is longer than the other leg 12c. As shown in FIG. 2, the support shaft 11 has a head 11 at one end.
a, and are held by the base body 7 and the cover plate 8 by appropriate means such as caulking or welding, respectively.

When assembling the illustrated operating mechanism to the case, one end of the operating shaft 9, the supporting shaft 14 and the supporting shaft 17 is connected to the case body 7 with the lever 12 being removed from the supporting shaft 11 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, the above-mentioned shafts can be fitted with the open / close spring 22 in a free state. Thereafter, the lever 12 is pulled up in the direction of the arrow in FIG.
Further, as shown in FIG. 4, the bearing groove 27 is fitted to the support shaft 14 while being aligned. At this time, if the longer leg 12b is brought into contact with the support shaft 14 after the shorter leg 12c of the lever 12 has passed over the support shaft 11, the bearing groove 27 can easily face the support shaft 11. be able to. In order to pull up the lever 12 against the opening / closing spring 22, it is preferable to use an appropriate jig. For example, the tip of a hook inserted from a small hole formed in the upper wall of the case body 7 is hooked on the lever 12, A method such as pulling the hook with a screw-type pulling tool can be adopted.

[0012]

As described above, according to the present invention, the lever end is supported on the support shaft through the U-shaped bearing groove, thereby receiving the force of the opening / closing spring except for the lever end. Then, the operating mechanism can be assembled to the case, and finally only the end of the lever can be fitted to the support shaft by extending the opening / closing spring, so that the operating mechanism can be easily assembled without applying excessive force to each part. Only
Also, make one leg of the lever holding the spindle longer than the other leg.
As a result, use the longer leg as a stopper and pivot the lever end.
And the bearing groove is fitted to the support shaft.
Work is easy.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of an operation mechanism of a vacuum circuit breaker according to an embodiment of the present invention.

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

FIG. 3 is a view showing a state in which a lever end of the operation mechanism of FIG. 1 is removed from a support shaft.

FIG. 4 is a view showing a state in which a lever end of the operation mechanism shown in FIG. 1 is fitted to a support shaft.

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

6 is a main part side view showing a conventional configuration of an operation mechanism in the vacuum circuit breaker of FIG. 5;

[Explanation of symbols]

 Reference Signs List 3 vacuum valve 6 operation handle 7 case body 8 cover 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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 33/40 F16H 21/10 H01H 33/28 H01H 33/42 H01H 31/02

Claims (1)

(57) [Claims] A lever pivoted on one end supported by a support shaft in conjunction with an operation lever to be opened and closed, and the other end of the lever and a center pin of a toggle link for driving a movable contact; In an operation mechanism of a switch with an open / close spring applied between the lever, an end of the lever supported by the support shaft has a U-shaped
A bearing groove is formed, and the lever is connected to the lever through the bearing groove.
The lever supporting the support shaft and sandwiching the support shaft
Characterized in that one leg of the switch is longer than the other leg .