JPH07201261A - Cantilever switchgear - Google Patents

Abstract

PURPOSE:To prevent the concentration of stress in an area protruded from an insulated base of operating strips and eliminate any accident in a switchgear by providing cutout spaces of specified form in the protruded base of the operating strips of the insulate base. CONSTITUTION:A switchgear has an insulated base 20 provided with operating strips 10, 10' having one-side ends fixed and the other-side formed as free ends 12, 12' so that contacts 13, 13' can be opened/closed with the action of the free ends 12, 12'. In addition, cutout spaces 22, 22' are formed in an area 14, 14' where the operating strips 10, 10' of the insulated base 20 are protruded. The cutout spaces 22, 22' have slopes formed on wall faces 221, 222 and 211', 222' opposed to both faces in thickness direction of the operating strips 10, 10' in such a manner that the slopes may be enlarged from the fixed ends of the operating strips 10, 10' to the free ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cantilever type opening / closing device.

[0002]

2. Description of the Related Art A cantilever type switchgear 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 in general electric equipment and thermostat devices. This opening / closing device has a structure in which one end of an actuating piece is fixed and a free end moves in the air by an external force or a bending motion of a bimetal, and the contact amount is directly or indirectly opened / closed by the moving amount. For example, as disclosed in Japanese Utility Model Laid-Open No. 4-63529, an inversion spring driven by the operation of a bimetal piece is provided,
A configuration in which the contact is opened and closed by this reversing spring is often used.

[0003]

In such a cantilever type switchgear, since the elongated operating piece is fixed to the insulating base at one end, it is resistant to vibration and shock applied from the outside. There is a structural defect that the working piece is large in the length direction and width direction but 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, stress concentrates on the protruding base of the operating piece, that is, the boundary between the operating piece and the insulating base at the part protruding from the insulating base, and even if the free end of the operating piece does not deform, permanent deformation occurs in the base. Occurs. Therefore, this causes a failure during use of the switchgear, which causes a serious accident.

[0004]

According to the present invention, the operating piece 10,
The stress applied to 50 is distributed by the stress distribution part in the operating piece projecting base part. According to the invention of claim 1, as shown in FIG. 1, the working piece 10 has the fixed end 11 embedded in the insulating base 20, and the thickness of the working piece 10 is provided on the side of the working piece protruding base 14 of the insulating base 20. Notch space 22 facing both sides in the direction
The wall surface of the notch space 22 facing the operating piece 10 is formed with inclined surfaces 221 and 222. According to the second aspect of the invention, the elastic cushion layer 40 is layered on the projecting base portion 52 of the operating piece 50, and the cushion layer 40 has at least the projecting base portion 52 of the fixed end 51 of the operating piece 50.
It extends to the first part following. The invention of claim 3 is characterized in that the elastic cushion layer 40 'is provided with the protruding base portion 52' of the actuating piece 50 'and the cushion layer 40' provided at a part of the fixed end 51 'subsequent thereto.

[0005]

[Operation] Since the device of the present invention is such, in the invention of claim 1, the abrupt curve in the projecting base portion 14 of the operating piece 10 is corrected to the gentle curve by the inclined surfaces 221 and 222. That is, the stress concentration at the projecting base portion 14, particularly at the boundary line between the projecting base portion 14 of the actuating piece 10 and the insulating base 20, is dispersed over the entire projecting base portion 14 by the action piece curving degree regulating action of the inclined surfaces 221 and 222. And claim 2
In the invention described above, the abrupt bending of the operating piece 50 is relieved by the elastic cushion layer 40, and the entire projecting base portion 52 of the operating piece 50 is deformed and dispersively absorbed. According to the third aspect of the invention, the operating piece 50 'is maintained without losing the strong holding force of the rigid insulating base 70.
The stress concentration can be prevented by dispersing the impact force and vibration applied to the protruding base portion 52 '.

[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, 10 'are fixedly embedded in the insulating base 20 with one end as a fixed end 11, 11', and the other end is provided as a free end 12, 12 'with contacts 13, 13'. The actuating piece 1010 'has lead wires 30,
30 'is connected, and the operating pieces 10, 10' are always in pressure contact with 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 the operating pieces 10, 10 '.
The side from which the projecting portion is projected is the front surface 21, and the projecting base portions 14 and 14 'of the operating pieces 10 and 10', that is, the operating piece 1 are provided on the front surface 21.
A notch space 22.22 'including the vicinity of the boundary with the base 20 in a portion where 0 and 10' project from the insulating base 20 is formed as a stress dispersion portion. The cutout spaces 22, 2
Reference numeral 2'includes wall surfaces 221 and 222 facing both sides in the thickness direction of the operating pieces 10 and 10 '.
1, 222 are the operating piece fixed ends 11 and 11 'to the free end 1
The inclined surfaces are formed so that the distance from the actuating pieces 10, 10 'gradually increases toward 2, 12'. This inclined surface 22
1, 222 may be formed on the inclined surfaces 221 ', 222' having a curvature like the cutout space 22 '.
When it is desired to make the lengths 1, 222 longer, as shown in FIG.
You may combine as a part.

The embodiment shown in FIGS. 2 and 4 uses the elastic cushion layers 40 and 40 'as the stress dispersion portion.
In this embodiment, the operating pieces 50, 50 'are made of bimetal pieces. In such an opening / closing device, the pair of bimetal pieces 50, 50 'is configured to drive the reversing spring 60 to perform the opening / closing operation. The reversing spring 60 is provided with the movable contact 61, while the base is provided. A fixed contact 71 is provided on the 70 side.

In this embodiment, the elastic cushion layer 40 is layered on both sides in the thickness direction from the buried side fixed end 51 of the one operating piece 50 to the projecting base portion 52, and the elastic cushion layer 40 serves to disperse the stress dispersion portion. Is formed. Further, the other operating piece 50 ′ has a fixed end 5
An elastic cushion layer 40 'is provided across the front portion of 1'and the protruding base portion 52' of the operating piece 50 ', and the cushion layer 40' forms a stress dispersion portion. In either case, the actuating pieces 50, 50 'are at least near the boundary with the base 70 and the fixed end 51 following it, 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 layered. The cushion layer 40 may be provided on the projecting member 70 'as shown in FIG. 4, as in the above embodiment.

The device according to the present invention is thus provided with the operating pieces 10, 1.
Since 0 ', 50 and 50' are provided with the stress dispersion portions on both sides in the thickness direction, no permanent strain occurs in the operating piece. That is, in the embodiment shown in FIGS. 1 and 3, since the operating pieces 10, 10 'bend along the inclined surfaces 221, 222, 221', 222 ', the stress is concentrated at one point of the operating pieces 10, 10'. Without doing so, it is dispersed, and in the embodiment shown in FIGS. 2 and 4,
This is because the operating pieces 50, 50 'bend while absorbing and dispersing the stress by the elastic cushion layers 40, 40', so that the stress can be prevented from concentrating on one point of the operating pieces 50, 50 '.

[0010]

As described above, the device of the present invention is provided with the operating pieces 10, 1.
When 0 ', 50, 50' is deformed by an external force, the amount of the deformation can be dispersed, so that stress is prevented from concentrating on one point of the operating piece and permanent deformation of the operating piece is prevented. It has the effect of cleaning up the accident.

[Brief description of drawings]

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

FIG. 2 is a schematic side view showing the other 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 of the present invention.

[Explanation of symbols]

 10 Working piece 11 Fixed end 12 Free end 13 Contact point 14 Projection base 20 Insulation base 21 Front base 22 Notch space 221 Sloping surface 222 Sloping surface 30 Lead wire 40 Elastic cushion layer 50 Working piece 51 Fixed end 52 Projection base 60 Inversion spring 70 base

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[Procedure amendment]

[Submission date] January 11, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

Claims (3)

[Claims] 1. An opening / closing device having an operating piece having one end fixed to an insulating base and the other end being a free end, wherein the opening / closing operation is performed by the operation of the free end of the operating piece. Of the operating piece is formed with a notch space, and the notch space forms a wall surface facing both sides in the thickness direction of the operating piece as an inclined surface, and the inclined surface is a free end from the fixed end of the operating piece. A cantilever type opening / closing device characterized by being formed so as to expand toward. 2. An opening / closing device having an operating piece having one end fixed to an insulating base and the other end being a free end, wherein the opening / closing operation is performed by the operation of the free end of the operating piece. For the fixed end in the insulating base and the protruding base following it,
A cantilever type opening / closing device, characterized in that an elastic cushion layer that overlaps with both sides in the thickness direction of the operating piece is formed in multiple layers. 3. An opening / closing device having an operating piece having one end fixed to an insulating base and the other end being a free end, wherein the opening / closing operation is performed by the operation of the free end of the operating piece. A cantilever type opening / closing device characterized in that an elastic cushion layer which is superposed on both surfaces in the thickness direction of the operating piece is formed on a protruding base portion protruding from the insulating base and a part of a fixed end following the protruding base portion. .