JP2000067727A - Accessory switch for opening/closing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a movable contact from damaging even when a lever excessively rotates by assembling error, in an accessory switch performing an opening/closing operation due to turning of the lever interlocking with an opening/closing shaft of an opening/closing apparatus. SOLUTION: In this accessory switch 6, in which a movable contact 13 comprises a plate spring of which one end is fixed to one terminal plate 10, and is pressed and deformed by rotation of a lever 16 interlocking with an opening/closing shaft of an opening/closing apparatus to separate its tip movable contact 14 from the other terminal plate 11, a circular arc bent portion 13a is provided between the fixing side and the tip side of the movable contact 13, the lever 16, when turned more than a specified angle α, approaches the bent portion 13a, and after that the movable contact 13 little deforms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch attached to a switchgear such as a circuit breaker or an earth leakage breaker, and detects an operation of the switchgear as an electric signal.

[0002]

2. Description of the Related Art FIG. 15 is a schematic side view showing an example of the relationship between this type of attached switch and a switching device (circuit breaker for wiring). In the mold case of the switchgear 1, a shut-off unit 2,
The opening / closing mechanism 3 and the tripping section 4 are accommodated, and a handle 5 for manually operating the opening / closing mechanism 3 is provided outside the case. The movable contact (not shown) of the blocking unit 2 is a handle 5
Is opened and closed by the opening and closing operation of the opening and closing mechanism unit 3 by the operation of
The opening is performed by a trip operation of the opening / closing mechanism unit 3 by a trip signal from the trip unit 4. In order to detect the operation of such a switching device, an attached switch 6 is attached. The accessory switch 6 has an operation shaft 7 connected to an opening / closing shaft 3 a that rotates with the opening / closing operation of the opening / closing mechanism 3.
A lever (not shown) attached to the operation shaft 7 opens and closes the attached switch 6 in conjunction with the opening and closing shaft 3a.

FIG. 8 shows a conventional example of the accessory switch 6, in which (A) is a longitudinal sectional view, (B) is a sectional view taken along the line BB, and FIG. 11 is a movable contact in FIG. It is a perspective view of. 8 and 11, reference numeral 8 denotes a case made of resin, 9 denotes a cover, and a pair of terminal plates 10 and 11 are fitted into the case 8, and terminal screws 12 are attached to their lead wire connection ends, respectively. ing. A movable contact 1 made of a leaf spring such as phosphor bronze is provided on the terminal plate 10.
3 is fixed by a rivet 15 at an L bent portion at one end, and a movable contact 14 is attached to a tip of the rivet 15. on the other hand,
The terminal plate 11 also serves as a fixed contact, and the movable contact 14 is in contact with the L-bent contact portion 11 a by being pressed by the spring force of the movable contact 13.

The operating shaft 7 described above penetrates the cover 9 rotatably near the fixed end of the movable contact 13, and a flat lever 16 is integrally formed on the operating shaft 7. The lever 16 is held in a state parallel to the movable contact 13 as shown in, for example, the ON state of the switching device 1 (FIG. 15), and the attached switch 6 is also in the ON state.

FIG. 9 shows a state in which the attached switch 6 is turned off. That is, when the opening / closing device 1 is turned off, the operating shaft 7 is moved in conjunction with the opening / closing shaft 3a (FIG. 15) as shown in FIG.
, The movable contact 13 is pushed upward by a lever 16 rotated integrally with the operation shaft 7 and the tip is elastically deformed. As shown in FIG. Separate from 11a. Thereby, the attached switch 6 is turned off. Further, when the lever 16 returns to the state shown in FIG. 8 by the ON operation of the switching device 1, the movable contact 13 returns to the state shown in FIG. 8 due to its own spring property, and the attached switch 6 is turned on again.

FIG. 12 is a side view showing the inside of an attached switch showing a different conventional example. The attached switch 6 in FIG.
Although two sets of fixed contacts are provided, one end of a movable contact 13 made of a leaf spring is fixed to one terminal plate 10, and a movable contact 13a of the other terminal plate 11 also serving as a fixed contact is provided. The point at which the movable contact 14 at the tip of the child 13 is in contact is the same as in the conventional example of FIG. However, in this case, the strip-shaped slide plate 17 is guided by the case 8 and is provided so as to be movable in a direction substantially orthogonal to the movable contact 13, and is provided in a groove 18 formed by cutting out in a direction perpendicular to the moving direction. Lever 1
The pin 16a at the tip of No. 6 is inserted. Operation pins 19 are attached to the slide plate 17 at positions facing the movable contacts 13, respectively.

FIG. 13 shows that the attached switch 6 of FIG. 12 is turned off.
It shows the status. When the opening / closing device 1 is turned off and the lever 16 rotates clockwise in FIG. 12 in conjunction with the opening / closing shaft 3a, a linear pressing surface 18a formed by the inner peripheral surface on the left side of the groove 18 in FIG. The slide plate 17 moves to the left by being pushed by the pin 16 a contacting the movable contact 13, and pushes the movable contact 13 through the operation pin 19. As a result, the tip of the movable contact 13 is elastically displaced as shown in FIG.
Is separated from the fixed contact portion 11a. When the lever 16 returns to the state shown in FIG. 12 due to the ON operation of the switching device 1, the movable contact 13 returns to the state shown in FIG. 12 due to its own spring property.

[0008]

In the attached switch 6 described above, the turning angle of the lever 16 which turns between ON and OFF in conjunction with the opening / closing shaft 3a is determined by the turning error of the opening / closing shaft 3a,
There is a variation due to an attachment error of the attached switch 6 with respect to the switchgear 1, and this rotation angle is
The separation distance D of the movable contact 14 required for the FF (see FIGS. 9 and 1)
In some cases, the angle may become larger than the angle corresponding to 3). FIG.
FIG. 14 shows a case where the lever 16 is rotated more than necessary due to the above-mentioned variation. In this case, the movable contact 13 is further deformed from the required separation position, and in FIG. 10, the slide plate 17 moves more than the required distance.

Therefore, in the related art, in order to prepare for the excessive rotation of the lever 16, the auxiliary switch 6 shown in FIG. 10 takes an extra space 8a for the movable contact 13 in the case 8, and FIG.
In the attached switch 6 of No. 4, as a result of extra space 8b for moving the slide plate 17, the outer shape of the attached switch 6 was increased by that much. Conventionally, there is a risk that the movable contact 13 is excessively deformed and the stress inside the leaf spring exceeds an allowable value. An object of the present invention is to reduce the size of an attached switch and prevent damage to a movable contact by preventing a movable contact or a slide plate from being excessively deformed or moved even if a lever rotates more than necessary. It is in.

[0010]

According to the present invention, when the rotation angle of the lever of the attached switch exceeds a specific range, the deformation of the movable contact with respect to the rotation angle of the lever becomes smaller than in the specific range. Thus, the above object is achieved (claim 1). According to such a means, even if the lever rotates beyond the specific range, the movable contact can hardly be deformed thereafter.

In this case, in the accessory switch corresponding to the conventional example of FIG. 8 in which the distal end of the movable contact is directly pressed by the distal end of the lever, an arc-shaped curve is provided between the fixed side and the distal end of the movable contact. When the rotation angle of the lever exceeds a specific range, the tip of the lever enters the curved portion so that the displacement of the movable contact becomes small (claim 2).

Further, a slide plate which is moved by being pushed by the tip of a lever is provided, and the movable contact is pushed through the slide plate. Is formed in a mountain shape composed of first and second two surfaces, and when the rotation angle of the lever exceeds a specific range, the contact point of the lever moves to the first position of the pressing surface. A transition from the surface to the second surface is made so that the displacement of the movable contact becomes small (claim 3).

[0013]

1 and 4 show an embodiment in which the conventional example of FIG. 8 is improved. FIG. 1 (A) is a longitudinal sectional view, and FIG. FIG. 4 is a perspective view of the movable contact in FIG. 1 and 4 differ from FIG. 8 in that an arcuate curved portion 13a is provided between the fixed side and the distal end side of the movable contact 13. FIG. 2 shows the attached switch 6 in an OFF state.
As shown in FIG. 2, the tip of the lever 16 is a flat portion on the tip side of the movable contact 13 until the lever 16 rotates to the specific range α and the movable contact 13 is deformed to the required separation distance D. When the lever 16 rotates to the angle α, its tip reaches the corner of a small arc between the curved portion 13a and the flat portion 13b of the movable contact 13.

When the lever 16 is further rotated in the counterclockwise direction from the position indicated by the broken line of the rotation angle α in FIG. 3, the tip of the lever 16 enters the curved portion 13a. Here, the shape of the inner peripheral surface of the curved portion 13a is such that the lever 1 is turned after the rotation angle slightly exceeds α.
6 has a shape approximating the arc drawn by the end face. Therefore, in a range where the rotation angle of the lever 16 exceeds α and becomes excessive, the tip of the lever 16 slides along the inner circumferential arc surface of the curved portion 13a, and the movable contact 13 is almost deformed. do not do. Therefore, according to the illustrated embodiment, even if the lever 16 rotates more than necessary, the deformation of the movable contact 13 peaks out, and the deformation space 8 a of the movable contact 13 in the case 8 can be reduced. At the same time, damage to the movable contact 13 due to excessive deformation does not occur.

FIG. 5 shows an embodiment in which the conventional example of FIG. 12 is improved. 5 differs from FIG. 12 in that the pressing surface 1 of the groove 18 pressed by the pin 16a of the lever 16 is different.
8a is formed in a mountain shape composed of two surfaces of a first surface 18b and a second surface 18c obliquely interposed therebetween through a small arc surface. In the ON state of FIG.
a is in contact with the first surface 18b. FIG. 6 shows the attached switch 6 in the OFF state. As shown in FIG. 6, the pin 16a is held until the lever 16 rotates to the specific range α and the movable contact 13 is deformed by the required separation distance D. Pushes the first surface 18b of the slide plate 17, but the lever 16
When the pin 16a is rotated, the pin 16a reaches the top of the small arc of the chevron pressing surface 18a.

When the lever 16 is further rotated clockwise as shown in FIG. 7, the pin 16a moves to the second surface 18c. Here, at the point where the pin 16a slightly exceeds the top of the pushing surface 18a, the second surface 18c
By the rotation of 6, the pin 16a is formed at the same inclination as the tangent to the arc drawn by the outermost surface of the pin 16a. Therefore, the pin 16a that has moved to the second surface 18c slides substantially along this surface 18c, and after the rotation angle of the lever 16 exceeds the specific range α, the movable contact 13 almost stops moving. Does not deform. Therefore, in the illustrated embodiment, even if the lever 16 rotates more than necessary, the deformation of the movable contact 13 reaches a peak.

[0017]

As described above, according to the present invention, after the lever causes the required separation distance of the movable contact, even if the lever is further rotated, the movable contact is hardly deformed. This eliminates the need for extra movable contact deforming space in the case of the attached switch, which makes it possible to reduce the size of the attached switch and makes it impossible for the movable contact even if the lever is turned excessively. It will not be damaged by excessive force.

[Brief description of the drawings]

FIG. 1 shows an attached switch according to an embodiment of the present invention;
(A) is a longitudinal sectional view, and (B) is a sectional view along the BB line.

FIG. 2 is a diagram showing an attached switch in an OFF state in FIG. 1;

FIG. 3 is a diagram showing a state where the lever in FIG. 2 is further rotated.

FIG. 4 is a perspective view of a movable contact in the attached switch of FIG. 1;

FIG. 5 is an internal side view of an attached switch according to another embodiment of the present invention.

FIG. 6 is a view showing an OFF state of an accessory switch of FIG. 5;

FIG. 7 is a view showing a state in which the lever in FIG. 6 is further rotated.

8A and 8B show a conventional accessory switch, in which FIG. 8A is a longitudinal sectional view, and FIG. 8B is a sectional view taken along the line BB.

FIG. 9 is a diagram showing an OFF state of an attached switch of FIG. 8;

10 is a diagram illustrating a state in which the lever in FIG. 9 is further rotated.

11 is a perspective view of a movable contact of the attached switch of FIG. 8;

FIG. 12 is an internal side view of an attached switch showing a different conventional example.

FIG. 13 is a diagram showing an attached switch in an OFF state in FIG. 12;

14 is a diagram illustrating a state where the lever in FIG. 13 is further rotated.

FIG. 15 is a schematic side view of a switchgear provided with an attached switch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Opening / closing apparatus 6 Attached switch 7 Operation axis 10 Terminal plate 11 Terminal plate 13 Movable contact 16 Lever 16a Pin 17 Slide plate 18 Groove 18a Pushing surface 18b First surface 18c Second surface 19 Operation pin

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Naoji Uchida 1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. No.1 Fuji Electric Co., Ltd. F-term (reference) 5G030 CA01

Claims (3)

[Claims] An opening and closing device which includes a lever rotatable in conjunction with an opening and closing shaft of the opening and closing device, and a movable contact made of a leaf spring having one end fixed, the movable contact being pushed by the rotation of the lever. In an attached switch of an opening / closing device that has a tip elastically deformed and opens and closes with a fixed contact, when the rotation angle of the lever exceeds a specific range, the deformation of the movable contact with respect to the rotation angle of the lever Is smaller than in the specific range. 2. The method according to claim 2, wherein the distal end of the lever directly pushes the distal end of the movable contact, and an arc-shaped curved portion is provided between the fixed side and the distal end of the movable contact. 2. The switch according to claim 1, wherein when the distance exceeds a specific range, the tip of the lever enters the curved portion to reduce the deformation of the movable contact. 3. A slide plate which is moved by being pushed by the tip of the lever is provided. The movable contact is pushed through the slide plate, and the pressing surfaces of the slide plate pushed by the lever are first and second. 2, the contact point of the lever shifts from the first surface of the pushing surface to the second surface when the rotation angle of the lever exceeds a specific range. 2. The switch according to claim 1, wherein the movable contact is less deformed.