CN1036100C - power switch button - Google Patents

Abstract

The present invention provides a switching operation even in case that a user presses the periphery of a stem. A round line material having roughly circular cross section is used as the metallic member, and also a mobile contact 12 in the shape of an elastic thin plate is provided between the dome- shaped spring member 11 driven by the stem 7 and the fixed contact 5. By pushing in the stem 7, resisting the spring member 11, the mobile contact 12 contacts with a pair of fixed contacts 5 and performs switching. The mobile contact has freedom, being provided separately from the spring member, so that mobile contact contacts with both a pair of fixed contacts.

Description

power switch button

The present invention relates to a small pushbutton switch suitable for tape assembly and automatic installation.

In the known art in this field, a push button switch has a fixed contact made of a round metal wire, as proposed by the applicant in Japanese Patent Laid-Open No. 5-325710.

Fig. 5 is a sectional view showing such a push button switch. The button switch includes an insulating housing 2 with an opening at its top, which is made of synthetic resin material; a pair of fixed contacts 5 formed by the exposed part of the round metal wire 3, the round metal wire 3 It is molded into the insulating case 2, and is located at the inner bottom part 4 of the insulating case 2; the terminal (not shown) formed by extending the other end of the round metal wire 3 out of the insulating case 2 ; relative to the fixed contact 5 in the insulating housing 2 and comprising an arched spring member 6 of a movable contact; a part exposed from the opening 1 and capable of pushing the spring member 6 toward the fixed contact 5 column 7, and a cover 8 mounted on the top of the insulating housing 2 to prevent the column 7 from falling off.

In the push button switch with such a structure, when the operator presses down the column 7 as shown in FIG. Closure from open state to closed state. Further, when the operator cancels the pressure applied to the post 7 in this closed state, the spring member 6 returns to its initial state due to its elastic resilience, the post 7 is pushed to the initial position, and the spring member 6 is released from the fixed position. The contacts 5 are separated, thereby returning to the open state. In this push button switch, since the round wire 3 for constituting the fixed contact 5 or the like can be cut by a relatively small shearing force, the abrasion of the edge of the cutting terminal can be limited, and by using the round wire 3 , the material cost can be reduced.

In the above known push button switch, when the operator presses the peripheral edge of the post 7 in the direction indicated by arrow 9 in FIG. 6 (it is called end pressing), the post 7 presses the spring member 6 in an inclined state. Since the spring member 6 is pressed in an oblique direction, the spring member will not be bent into a predetermined shape, with the result that the spring member 6 contacts only one of the fixed contacts 5, and the closing operation from the open state to the closed state is unstable.

In light of such circumstances in the prior art, an object of the present invention is to provide a push button switch capable of stable closing operation even when the peripheral edge of the post is pressed.

In order to achieve the above objects, the push button switch of the present invention includes an insulating case made of synthetic resin material, a pair of fixed contacts constituted by bare parts of metal parts, which are molded into the insulating case. On the inner bottom surface of the insulating shell, the terminal formed by the metal part protruding from the insulating shell, the movable contact opposite to the fixed contact in the insulating shell, and a push movable contact with the fixed contact The main feature of the push button switch is that it consists of a round metal wire with a nearly circular cross-section as the metal part, a thin, elastic flat plate is used as the movable contact, and a The arched spring part is arranged between the column and the movable contact, and the spring part is pressed by the column, so that the movable contact is pushed to contact with the fixed contact to realize closing.

When the operator overcomes the elastic rebound force of the arcuate spring member by pressing on said post, since the spring member is bent and compresses the thin, flat movable contact, the movable contact is also elastically deformed and pressed. Pushed into contact with the fixed contact, thereby achieving closure from the open state to the closed state. Further, when the operator cancels the pressing force exerted on the column in the closed state, the spring member returns to the original state by its own elastic resilience, so that the column is pushed back to its original position, and the The movable contact is also separated from the fixed contact by its elastic rebound force, and returns to the open state.

Further, when the operator presses the peripheral edge of the column, the column in the inclined state presses the spring member in an oblique direction, since the movable contact is separately provided from the spring member and has elasticity, it can In a steady state, it is elastically deformed and pushed to contact with the two fixed contacts. Thereby, a stable closure can be achieved even when pressing the peripheral edge of the post.

An embodiment of the present invention will now be described with reference to the accompanying drawings.

Fig. 1 is a sectional view according to an embodiment of the present invention;

Fig. 2 is a sectional view of the push button switch in a closed state;

Fig. 3 is a plan view, and it has shown post, spring member and the like from the state after being disassembled from pushbutton switch;

Fig. 4 is a diagram illustrating the operation of a movable contact provided in the push button switch. In these figures, parts corresponding to those in Figures 5 and 6 are designated by the same numerals. Briefly, the numerals 1, 2, 3, 4, 5, 7 and 8 designate the opening, the insulating casing, the round wire, the inner bottom, the fixed contact and the cover, respectively.

The button switch in this embodiment is different from the aforementioned conventional button switch in that an arched spring member 11 opposite to the fixed contact 5 is provided in the insulating housing 2, and between the spring member 11 and the fixed contact 5 Insert a flexible sheet type movable contact 12, which is manufactured in phosphor bronze or stainless steel. Other structures are roughly the same.

In FIGS. 1 to 3, the insulating case 2 of the push button switch is manufactured by molding a synthetic resin into a cylinder closed at one end. In the process of molding the insulating case 2, two round metal wires 3 which have been press-worked in advance are placed in parallel, the part of the round metal wires 3 protruding from the insulating case 2 is bent to form a terminal, and Unused parts are cut off, whereby stationary contacts 5 and not-illustrated terminals are formed from the round wire 3 . When in the pre-pressing process of the round metal wire 3, although not shown, a die having a groove along the extending direction of the round metal wire 3 is used to press out the round metal wire 3 from the bottom, thereby making the round wire 3 is bent, only the portion corresponding to the fixed contact 5 protrudes higher than the other portions, and the protrusion 5a is formed on the bottom of the fixed contact 5 by the above-mentioned groove. As shown in FIG. 3, as a result of this press working, after the insulating case 2 is molded out, the fixed contact 5 is exposed in the concave portion 4a, and the round metal wire 3 having the same diameter as the fixed contact 5 Other parts and other parts positioned at the lower position of the fixed contact 5 are also exposed a little.

On the top of the insulating case 2, a series of mounting holes 2a for attaching a cover 8 are formed as shown in FIG. The portion 4a, in which the fixed contact 5 is provided, is formed with a stepped portion 4b at a position higher than the concave portion 4a and around the concave portion 4a. Both short sides of the movable contact 12 are placed on this stepped portion 4b, and the edges of the arched spring member 11 are placed on the movable contact 12. As shown in FIG. Further, stepped portions 4b protrude at two points in the direction in which the round metal 3 extends shown by the dashed-two dotted line in FIG. 3 for receiving both ends of the movable contact 12 in a rectangular shape. The side walls of the insulating case 2 at these two points are thinner than at other positions. Thus, the long side of the movable contact 12 is located in the same direction as the extension direction of the round metal wire 3. When the column 7 is not in motion, the movable contact 12 is located at a position across the concave portion 4a, and is aligned with the fixed contact. 5 separation.

In the push switch of the aforementioned structure, when the operator presses the column 7 to overcome the elastic rebound force of the spring member 11, as shown in FIG. 2, since the spring member 11 is bent and squeezes the movable contact 12, the movable contact 12 is also elastically bent and comes into contact with the fixed contact 5, thereby achieving closure from the open state to the closed state. Further, when the operator cancels the pressing force applied to the column 7 in this closed state, the spring member 11 returns to the original state by its own elastic resilience, and the column 7 is pushed upwards corresponding to the spring member 11. Returning to its initial position, the movable contact 12 is separated from the fixed contact 5 by its own elastic resilience and returns to the open state.

Still further, when the operator presses the peripheral edge of the column 7, the column 7 in the inclined state presses the spring member 11, because the movable contact 12 and the spring member 11 are separately arranged and have elasticity, and it can move in a stable state. Elastically bend and contact with two fixed contacts 5 . At this time, as shown in FIG. 4, although the force in the vertical direction (Z-axis direction) is deviated from the center position of the short-side direction (X-axis direction) of the movable contactor 12, it is applied to the shown movable contactor 12. On the contact, since the movable contact 12 is rectangular in shape, the stiffness in the direction of the short side (X-axis direction) is greater than the stiffness in the direction of the long side (Y-axis direction). ) is difficult to bend, and is bent only in the long-side direction (Y-axis direction), as a result: the movable contactor 12 is bent almost horizontally in the rectangular-side direction (X-axis direction) as described above. It bends elastically and contacts with the two fixed contacts 5 .

Therefore, in the above-described embodiment, since the movable contact 12 is elastically bent in an almost horizontal and stable manner in its short side direction, and comes into contact with both fixed contacts 5, even if the peripheral edge of the post 7 is pressed, achieve a stable closure. Further, by providing the protrusion 5a at the bottom of the fixed contact 5 in the insulating housing 2, the effect of the stopper whirl-stop can be enhanced.

As described above, according to the present invention, when the peripheral edge of the post is pressed, the post in the inclined position presses the spring member. However, since the movable contact and the spring member are separately provided and have elasticity, they can stably contact with the two fixed contacts, thereby achieving a stable closing, which can provide a very good push button switch in terms of operability .

Fig. 1 is a sectional view according to an embodiment of the present invention;

Fig. 2 is a sectional view of the push button switch in a closed state;

Fig. 3 is a plan view, and it has shown post, spring member and the like from the state after being disassembled from pushbutton switch;

Fig. 4 is a diagram illustrating the operation of the movable contact provided in the push button switch;

Fig. 5 is a sectional view showing a conventional push button switch;

Fig. 6 is a cross-sectional view showing a state in which a peripheral edge of a post provided on the push button switch is pressed. Explanation of the symbols used in the accompanying drawings:

1 opening

2 insulating housing

3 round metal wires (metal parts)

4 inner bottom

4a Recessed part

4b Ladder part

5 fixed contacts

7 columns

11 spring parts

12 Movable contacts

Claims (3)

1. A button switch, comprising: An insulating shell made of synthetic resin material; A pair of fixed contacts, which are formed by exposed parts of the metal parts inserted when molding the insulating case, are located on the inner bottom surface of the insulating case; a terminal formed by protruding the other end of the metal part from the insulating housing; a movable contact in said housing opposite said fixed contact; and a post for pushing the movable contact into contact with the fixed contact; Wherein, a round metal wire with a nearly circular cross-section is used as the metal part, a thin elastic flat plate is used as the movable contact, and an arched spring member is located between the column and the between the movable contacts, and by pressing the post to overcome the elastic force of the spring member, the movable contact is pushed to contact the fixed contact. 2. The push button switch according to claim 1, wherein a concave portion is formed at the inner bottom of the insulating housing, the fixed contact is placed in the concave portion, and the movable contact The head is located across the concave portion. 3. The push button switch according to claim 1 or 2, wherein said movable contact has a rectangular shape and its long side is located in the same direction as said metal member extends.

Images