JP2867314B2 - Cantilever switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cantilever type switchgear.

[0002]

2. Description of the Related Art A cantilever type opening / closing device in which an operating piece such as an elongated conductive spring material or a bimetal piece is fixed to an insulating base at one end is widely used for general electric equipment and thermostat devices. This opening / closing device has a configuration in which one end of an operation piece is fixed and a free end moves in the air by an external force or a bending operation of a bimetal, and the contact is opened or closed directly or indirectly by the amount of movement. For example, as disclosed in Japanese Utility Model Laid-Open No. 4-63529, a reversing spring driven by the operation of a bimetal piece is provided,
A configuration in which a contact is opened and closed by this reversing spring is often used.

[0003]

In such a cantilever type opening / closing device, since an elongated operating piece is fixed to an insulating base at one end thereof, the opening / closing device is resistant to vibration and impact applied from the outside. Although it is large in the length direction and the width direction of the working piece, it has a structural disadvantage that it is weak in the thickness direction of the working piece. Therefore, when the external force applied to the working piece is large or the number of times of application is large. In this case, even if the stress concentrates on the projecting base of the operating piece, that is, the boundary between the operating piece and the insulating base at the portion where the operating piece protrudes from the insulating base, even if the free end of the operating piece does not deform, the base is permanently deformed. Occurs. Therefore, this causes a trouble during use of the switchgear, and there is a problem that a serious accident is caused.

[0004]

According to the present invention, the operating piece 10,
The stress applied to 50 is distributed by the stress distribution portion at the base of the working piece protrusion. According to the first aspect of the present invention, as shown in FIG. 1, the working piece 10 has a fixed end 11 buried in an insulating base 20, and the thickness of the working piece 10 is provided on the working piece projecting base 14 side of the insulating base 20. Notch space 22 facing both sides in the direction
Are formed, and the wall surfaces of the notch space 22 facing the operation piece 10 are formed on the inclined surfaces 221 and 222 of the bulging curvature surface. According to the invention of claim 2, the elastic cushion layer 40 is overlaid on the protruding base 52 of the operation piece 50,
This cushion layer 40 extends at least to a part of the fixed end 51 of the working piece 50 following the protruding base 52. Claim 3
The present invention is characterized in that an elastic cushion layer 40 'is provided on a part of a protruding base 52' of a working piece 50 'and a fixed end 51' following the protruding base 52 '.

[0005]

According to the device of the present invention, the sharp curvature of the projecting base 14 of the operating piece 10 is reduced by the inclined surfaces 221 and 221 formed by the bulging curvature surface.
22 corrects the curvature. That is, the protruding base 1
4, especially the stress concentration at the boundary between the protruding base 14 of the operating piece 10 and the insulating base 20 is formed by the bulging surface.
Due to the action of restricting the degree of curvature of the operating piece by the inclined surfaces 221 and 222, it is dispersed over the entire projecting base 14. According to the second aspect of the present invention, the sharp bending of the operating piece 50 is alleviated by the elastic cushion layer 40, and the entire projecting base 52 of the operating piece 50 is deformed and absorbed. According to the third aspect of the present invention, it is possible to prevent the stress concentration by dispersing the impact force and the vibration applied to the projecting base 52 'of the operating piece 50' without losing the strong holding force of the rigid insulating base 70.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment shown in FIG. 1 shows an opening / closing device in which an operating piece 10 is made of a conductive spring material.
The terminals 0 and 10 'are buried and fixed in the insulating base 20 with one terminal as fixed ends 11 and 11', and the other terminal is provided with contacts 13 and 13 'as free ends 12 and 12'. The operating piece 1010 'has lead wires 30,
30 'is connected, and the operating pieces 10, 10' are always pressed against each other so as to close the contacts 13, 13 ', while being separated by an external force to open the contacts 13, 13'. ing. The insulating base 20 has its operating pieces 10, 10 '.
The projecting bases 14 and 14 'of the operating pieces 10 and 10', that is, the operating piece 1
A notch space 22.22 'that includes the vicinity of the boundary with the base 20 at a portion where 0, 10' protrudes from the insulating base 20 is formed as a stress dispersion portion. Notch space 22, 2
2 'has wall surfaces 221 and 222 facing both surfaces in the thickness direction of the operation pieces 10 and 10'.
1, 222 are free ends 1 and 11 from working piece fixed ends 11 and 11 '.
It is formed on an inclined surface having a bulging or convex surface such that the distance between the working pieces 10 and 10 'gradually increases toward the elements 2 and 12'. And the inclined surface 22 of the notch space 22 '
1 'and 222' are expanded similarly to the inclined surfaces 221 and 222.
It is formed on a convex inclined surface. Thus, the inclined surface 22
When it is desired to increase the length of the base members 20 , 222 (221 ', 222'), a protruding member 20 'having inclined surfaces 221 and 222 may be combined as a part of the base 20, as shown in FIG.

The embodiment shown in FIGS. 2 and 4 uses elastic cushion layers 40 and 40 'as stress dispersing portions.
In this embodiment, the working pieces 50 and 50 'are made of bimetal pieces. In such an opening / closing device, the pair of bimetal pieces 50, 50 'is configured to open and close by driving a reversing spring 60. The reversing spring 60 is provided with a movable contact 61, while a base is provided. A fixed contact 71 is provided on the 70 side.

In this embodiment, an elastic cushion layer 40 is layered on both surfaces in the thickness direction from the buried-side fixed end 51 to the protruding base 52 of one of the operating pieces 50. Is formed. The other working piece 50 'has its fixed end 5
An elastic cushion layer 40 'is provided over the front portion 1' and the protruding base 52 'of the operation piece 50', and a stress dispersion portion is formed by the cushion layer 40 '. In either case, however, the working pieces 50, 50 'are at least at the vicinity of the boundary with the base 70 and at the fixed end 51 following the boundary, that is, at the protruding bases 52, 52' and a part of the fixed end 51. Elastic cushion layers 40, 4 on both sides in the thickness direction
0 'is overlaid. The cushion layer 40 may be provided on the protruding member 70 'as shown in FIG. 4, similarly to the above embodiment.

The apparatus according to the present invention thus operates as follows.
Since 0 ', 50, and 50' have stress dispersing portions on both sides in the thickness direction, permanent deformation does not occur in the working piece. That Figure 1, in the embodiment shown in FIG. 3, the actuating piece 10, 10 'bulge
The inclined surface of the Jo curvature surface 221,222,221 ', 222'
, The stress is applied to one of the working pieces 10, 10 '.
In the embodiment shown in FIGS. 2 and 4, the working pieces 50 and 50 'bend while absorbing and dispersing the stress by the elastic cushion layers 40 and 40'. Can be prevented from concentrating on one of the operating pieces 50, 50 '.

[0010]

According to the present invention, the operating pieces 10, 1
When the 0 ', 50, 50' is deformed by an external force, the amount of the deformation can be dispersed, so that it is possible to prevent stress from being concentrated on one point of the operating piece and causing permanent deformation in the operating piece. This has the effect of eliminating accidents.

[Brief description of the drawings]

FIG. 1 is a schematic side view of the device of the present invention.

FIG. 2 is a schematic side view showing another embodiment.

FIG. 3 is a side view of a main part showing still another embodiment.

FIG. 4 is a side view of a main part showing still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Operating piece 11 Fixed end 12 Free end 13 Contact 14 Protrusion base 20 Insulation base 21 Base front 22 Notch space 221 Inclined surface 222 Inclined surface 30 Lead wire 40 Elastic cushion layer 50 Operation piece 51 Fixed end 52 Projection base 60 Reversing spring 70 base

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) H01H 1/26-1/30 H01H 1/50-1/54 H01H 37/00-37/74

Claims (3)

(57) [Claims] 1. An opening / closing device having an operating piece fixed at one end to an insulating base and having the other end as a free end, wherein the opening and closing operation is performed by the operation of the free end of the operating piece. A notch space is formed at a portion where the above-mentioned working piece protrudes, and this notch space expands a wall surface facing both surfaces in the thickness direction of the above-mentioned working piece.
A cantilever type opening / closing device which is formed on an inclined surface of a projecting curvature surface and which is formed so as to expand from a fixed end to a free end of an operating piece. 2. An opening / closing device having one end fixed to an insulating base and the other end being a free end, wherein the opening and closing operation is performed by the operation of the free end of the operating piece. The fixed end in the insulating base and the protruding base that follows,
A cantilever type opening / closing device characterized in that an elastic cushion layer, which is superimposed on both sides in the thickness direction of an operation piece, is formed in a multilayered manner. 3. An opening / closing device having one end fixed to an insulating base and the other end being a free end, wherein the opening and closing operation is performed by the operation of the free end of the operating piece. A cantilever type opening / closing device, comprising: a protruding base protruding from an insulating base; and an elastic cushion layer formed on one of two fixed ends following the protruding base on both surfaces in the thickness direction of the operating piece. .