JP3118086B2 - Push switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push switch in which a contact is opened and closed (switch ON / OFF) by pressing and releasing a pressing means such as a pressing element. However, the present invention relates to a very small switch (eg, about 4 mm long, 8 mm wide)
And a height of about 6 mm), and for this purpose, a contact spring piece is formed with a U-shaped spring piece that has a simple structure and can be manufactured with extremely small precision processing.

[0002]

2. Description of the Related Art In FD, DAT and other related electronic devices, a push type switch, which opens and closes an electric circuit by pressing and releasing a pressing element, a push button, and other pressing means, is extremely small (eg, 5 vertical, horizontal, and height dimensions
About 10 mm or less. If there is a switch that is inexpensive and has excellent high-frequency use durability and switching performance for a long time, the demand is enormous, but the conventional one has excellent performance. These switches are expensive, and inexpensive switches have inferior durability. In any case, no inexpensive switches suitable for the above dimensions have been provided.

In particular, as described above, it is required to have a very small size. Therefore, the opening / closing operation size of the switch (the distance between the movable contact and the fixed contact) by pressing and releasing a pressing means such as a pressing element is 0.1 mm. 51 mm or less, for example, 0.2 to 0.3 m
m, so that regardless of the variation error of each switch being about ± 0.1 mm, even if the conventional one is excellent, the leaf spring and the wire spring are placed on the movable side. Since the spring pieces such as are simply bent and processed, there are many manufacturing variations for each spring piece,
The above dimensional conditions could not be satisfied at all.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention has developed a push switch which is extremely small in size, can be manufactured at low cost, has no variation among switches, has excellent long-term high-frequency use durability and excellent switching performance. It was done.

That is, according to the present invention, there is provided a U-shaped spring piece comprising an upper piece, a bent portion, and a lower piece, wherein the U-shaped spring piece comprises a lower piece divided into two contact pieces.

A U-shaped portion is provided with a fulcrum shaft, and a U-shaped spring piece is fitted on the inner surface of the upper, U-shaped portion and lower plate. Provide a holder with a letter-shaped fitting groove or fitting recess,

In the fitting groove or fitting recess of the holder,
A contact spring piece in which the holder and the U-shaped spring piece are integrated with each other is fitted with the bent portion of the U-shaped spring piece in a state of accumulated force in which the upper piece and the lower piece of the U-shaped spring piece are compressed inward. Provided,

The contact spring piece is pivotally supported at a set position with its fulcrum shaft in a rotatable manner, and one contact piece is pressed against the one fixed contact in an anti-curve contact manner, whereby the holder is turned upward by the elastic restoring force. The power is installed in a state where the upper plate of the holder or the upper piece of the U-shaped spring piece collides with the stopper portion and is received, and the other contact piece is located at a position above the other fixed contact by a set distance,

Further, the above holder or the upper plate
The object has been solved by a push switch, which is provided with a pressing means such as a pressing element or a push button on an upper piece of a U-shaped spring piece.

The present invention also provides a fixed contact on an inner bottom surface of a box having an upper surface opening, protruding the terminal to the outside, and forming a through hole or a slit for a pressing element in a part of a top plate covering the upper surface opening, In addition, a case in which a concave portion or a shaft hole for a fulcrum bearing is formed on the side plate is provided,

In the case body, a contact spring piece is pivotally supported with a fulcrum shaft of a holder thereof in a recess or a shaft hole, and one contact piece is pressed against one fixed contact, and the other contact piece is connected to the other fixed contact. After inserting and installing in a state where it is located at a position above the fixed contact set distance,

A top plate is fitted to the upper surface opening, and a small projection projecting from the side plate of the box is engaged with and fitted to an engagement hole of an engagement piece vertically provided at a side end of the top plate. Project from the insertion hole or slit to the outside, and use the back surface of the top plate as a stopper to receive the upward rotation of the holder by pressing the contact piece against the fixed contact, and install the contact spring piece in the box so that it does not fall off The problem is solved by a push switch provided.

[0013]

According to the present invention, the contact spring piece, which is the center of the present invention,
In the fitting groove or fitting recess of the holder, which is all precisely and uniformly formed by molding processing of plastic, metal, etc.
Since the upper and lower pieces of the U-shaped spring piece are fitted in a compressed state (accumulated state, charged state), the U-shaped spring piece in the contact spring piece is formed on the outer peripheral surface by the inner surface of the holder. In particular, both contact pieces which are held in close contact with each other and have no room for deformation thereafter, and thus both contact pieces protruding from the holder (particularly, those whose tip ends are in a free state after installation) are also regulated by the holder, In all the manufactured contact spring pieces, a uniform protruding state is formed.

Accordingly, the positions of the tips (movable contacts) of the two contact pieces can be manufactured uniformly without variation for the contact spring pieces of all the switches.

That is, at the stage of manufacturing as a U-shaped spring piece, since a metal spring piece is mainly pressed, a slight variation (especially, a shape variation) occurs for each spring piece. In the stage where the contact spring pieces are fitted and integrated into the holder, the unevenness in the positional accuracy of the U-shaped spring pieces, particularly both contact pieces, can be completely eliminated for the above-described reason.

This means that when the contact spring piece is installed at a set position such as a case to constitute the push switch of the present invention, in all the switches, one contact piece is uniform to one fixed contact. The force causes a reverse bending pressure contact (this resilient force acts as an upward rotation force of the holder, that is, a repulsive force against the pressing force of the pressing means), and the set distance d between the other contact piece and the other fixed contact is reduced by the entire distance. This means that the switches are set to the same value, and therefore, a uniform pressing down distance (setting distance d) for all switches by the pressing means.
Thus, extremely high-precision switch performance can be ensured, in which the other contact piece is accurately pressed down to the other fixed contact and is switched ON.

According to the present invention, a U-shaped spring piece in which a leaf spring piece is simply bent into a U-shape to form two contact pieces, and a holder in which a presser, a fulcrum shaft and a fitting recess are formed are integrated. Since the contact spring piece which is provided by being fitted in a fixed manner can be housed and installed in a case or the like with a fixed contact, it can be mass-produced with a simple structure, extremely strong and at low cost.

In particular, since a contact spring piece made of a spring piece capable of mass and automatic small precision machining can be used, and a holder and a case capable of large quantity and automatic small precision plastic molding and fabrication can be used, It is possible to automatically mass-produce extremely small and high-precision switches, and to obtain push switches with excellent long-term high-frequency use durability and switching performance.

Further, according to the present invention, since the contact spring piece is pivotally supported about the fulcrum axis, the pressing force applied to the presser acts as a downward rotating force of the tip of the lower piece (that is, both contact pieces). The buckling of one piece and the fixed contact pressure contact of the other contact piece are performed accurately, and the tips of both contact pieces slide on each fixed contact surface by press contact, and this press contact slide exerts the self-cleaning effect of the contact. As a result, constant good conductivity can be obtained, and uniform and high-precision switching performance can be exhibited over a long period of time.

[0020]

Next, embodiments of the present invention will be described. (FIGS. 1 to 7) A U-shaped spring piece A in which the lower piece 3 is divided into two contact pieces a and b, of a U-shaped spring piece composed of an upper piece 1, a bent portion 2 and a lower piece 3. (FIGS. 4 to 6)

An upper plate 4a, a U-shaped portion 4b and a lower plate 4c are provided. The U-shaped portion 4b is provided with a fulcrum shaft 5, and a U-shaped spring piece A is provided on the inner side of the upper plate 4a, the U-shaped portion 4b and the lower plate 4c. And a holder B having a U-shaped fitting groove or fitting recess 6 for fitting the bent portion 2 of FIG.

The fitting groove or fitting recess 6 of the holder B
The U-shaped spring piece A is fitted with the bent portion 2 of the U-shaped spring piece A in a state where the upper piece 1 and the lower piece 2 of the U-shaped spring piece A are compressed inward. A is provided with a contact spring piece C integrating A (FIG. 3)

The contact spring piece C is rotatably supported at a set position with its fulcrum shaft 5 and one contact piece b
Is pressed against one of the fixed contacts 7b in an anti-curvature manner, and the upward rotation force of the holder B due to the resilient restoring force is applied to the upper plate 4a
Alternatively, the upper piece 1 of the U-shaped spring piece A is
Is installed in a state where it is received by colliding with
One piece is positioned above the other fixed contact 7a at a set distance d,

On the tip of the upper plate 4a of the holder B or on the tip of the upper piece 1 of the U-shaped spring piece A,
This is a push switch including a pressing means E such as a pressing element or a push button. (FIGS. 1 and 2)

The embodiment of the U-shaped spring piece A shown in FIG.
A lower piece 3 of a U-shaped spring piece composed of an upper piece 1, an inflection portion 2 and a lower piece 3 is provided separately for two contact pieces a and b.

The embodiment of the U-shaped spring piece A shown in FIG.
A strip-shaped contact piece a provided by cutting a U-shaped slit 10 in a lower piece 3 of a U-shaped spring piece composed of an upper piece 1, a bent portion 2 and a lower piece 3, and a contact provided therearound The two contact pieces a and b of the piece b are provided separately.

Another embodiment of the U-shaped spring piece A is a double U
The U-shaped spring piece A is a U-shaped spring piece A1, A2 in which a lower piece 3 of a U-shaped spring piece composed of an upper piece 1, an inflection portion 2, and a lower piece 3 is divided into two contact pieces a and b. 6 or, as shown in FIG. 6, the tip of the lower piece 3 of the U-shaped spring piece consisting of the upper piece 1, the recurved portion 2 and the lower piece 3 is connected to one contact piece. U-shaped spring piece A as a or b
1, two sheets of A2 are superposed to provide two contact pieces a and b.

The embodiment of the holder comprises an upper plate 4a, a U-shaped portion 4b and a lower plate 4c, a fulcrum shaft 5 provided on the U-shaped portion 4b, and an inner surface of the upper plate 4a, the U-shaped portion 4b and the lower plate 4c. Formed with a U-shaped fitting groove or fitting recess 6 for fitting the recurved portion 2 of the U-shaped spring piece A (FIG. 2), or an upper plate 4a and a U-shaped portion 4b. And a lower plate 4c, and a pressing member (pressing means) 4 in the shape of a chevron plate is integrally protruded on the tip end of the upper plate 4a.
The upper plate 4a, the U-shaped portion 4b, and the lower plate 4c are provided with a U-shaped fitting groove or fitting recess 6 formed on the inner surface side of the U-shaped spring piece A for fitting the re-bent portion 2 therein. Things. (FIG. 7) Further, it is provided with a dielectric such as plastic (illustrated example) or a conductor such as metal.

In the embodiment of the contact spring piece C shown in FIG. 3, the bent portion 2 of the U-shaped spring piece A is provided in the fitting groove or the fitting concave portion 6 of the holder B. The piece 1 and the lower piece 3 are fitted in a compressed state in an inwardly compressed state, and a holder B and a U-shaped spring piece A are integrally provided.

The pressing means E includes a holder B for the contact spring piece C.
A presser of any shape (eg, FIG. 1, FIG. 7, FIG. 8, FIG. 9, FIG. 9, FIG. 7, FIG.
Alternatively, a separate presser or push button (eg, FIG. 2) installed on the tip of the upper plate 4a of the holder B of the contact spring piece C or on the tip of the upper piece 1 of the U-shaped spring piece A, Any means capable of rotating the contact spring piece C about the fulcrum shaft 5 of the holder B by pressing the push pin, or the upper plate 4a of the holder B or the upper piece 1 of the U-shaped spring piece A is optional. It is.

[0031]

Next, an embodiment of the present invention in which a contact spring piece C is installed in a case D will be described. (FIGS. 8 and 9) Fixed contacts 7a and 7b are provided on the inner bottom surface of the box 8 having the upper surface opening.
The upper and lower terminals 7A and 7B are projected outside, a through hole or a slit 10 for the pressing element 4 is formed in a part of the top plate 9 covering the upper surface opening, and the front and rear side plates 11 are provided with recesses 12 for receiving the fulcrum shaft 5. Alternatively, a case D having a shaft hole is provided,

A contact spring piece A is placed in the box 8 of the case D.
The fulcrum shaft 5 of the holder B is pivotally supported by the concave portion 12 or the shaft hole, and one contact piece b is pressed against one fixed contact 7b while the other contact piece a is set a distance above the other fixed contact 7b. d After inserting and installing in a state of being separated,

The top plate 9 is fitted into the upper surface opening, and the small projections 13a projecting from the left and right side plates 13 of the box body 8 are fitted into the engaging holes 9b of the engaging pieces 9a vertically provided at the side ends thereof. And presses the pressing element 4 out of the insertion hole or slit 10 to the outside.
The fixed contact 7 of the contact piece b is used as a stopper 14
This is a push switch that receives the upward rotation of the holder B due to the pressure contact with the contact b, and that is installed and provided in the box 8 so that the contact spring piece C does not fall off.

The case D of the above embodiment has fixed contacts 7a and 7b on the inner bottom surface of the box 8 having the upper surface opening.
A, 7B are protruded to the outside, and the insertion hole or slit 1 of the pressing element (pressing means) 4 is formed in a part of the top plate 9 that covers the upper opening.
0, a recess 12 or a shaft hole for receiving the fulcrum shaft 5 is formed in the front and rear side plates 11.
Are detachably provided by engaging small projections 13a projecting from left and right side plates 13 of the box into engagement holes 9b of an engagement piece 9a vertically provided at a side end thereof.

[0035]

Next, the operation of the present invention will be described with reference to the push switch of the embodiment (see FIGS. 8 and 9). Slit 1 of top plate 9 of contact spring piece C installed in box 8 of case D
When a pressing element (pressing means) 4 protruding from the outside is pushed down, the pressing force is such that the upper piece 1 of the contact spring piece C (U-shaped spring piece A) is entirely compressed in the direction of the lower piece 3. However, since the contact spring piece C of the present invention is pivotally supported by the concave portion 12 of the case body 8 by the fulcrum shaft 5 protruding from the holder B, the pressing force is applied to the tip of the lower piece 3 around the fulcrum shaft 5 ( It acts as a force for pivoting the contact pieces a, b) downward.

Accordingly, the contact piece b which is already in anti-curvature contact with the fixed contact 7b is further buckled, and the contact piece a descends the set distance d and is pressed against the fixed contact 7a to be turned on.

As described above, since the pressing force acts so as to rotate the tip of the lower piece 3 downward about the fulcrum shaft 5, the contact piece b which has already been pressed and the contact piece a which has been pressed later are contacted. However, both slide slightly so as to rub on the surfaces of the fixed contacts 7a and 7b in a state of being pressed against the fixed contacts 7a and 7b. This action is the action of cleaning the two contacts and the action of preventing chattering.

When the pressing of the pressing element 4 is released, the upper and lower pieces 1 and 3 are resiliently restored to their original shapes, and the contact piece b is also resiliently restored (while being pressed against the fixed contact 7b). a restores the set distance d from the fixed contact 7b and restores it to the switch 0FF.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a configuration of an embodiment of a push switch of the present invention, in which a pusher (pressing means) is integrally provided on an upper piece of a holder.

FIG. 2 is a view showing a schematic configuration of an embodiment of the push switch of the present invention, in which a pressing means is a push button separately provided on an upper piece of a holder.

FIG. 3 is a front view, a plan view, a bottom view, and a right side view of the embodiment of the contact spring piece.

FIG. 4 is a front view, a plan view, a bottom view, and a right side view of the embodiment of the U-shaped spring piece.

FIG. 5 is a front view, a plan view, a bottom view, and a right side view of the embodiment of the U-shaped spring piece.

FIG. 6 is a front view, a plan view, and an embodiment of a double U-shaped spring piece;
A bottom view and a right side view.

FIG. 7 is a front view, a plan view, a bottom view, and a right side view of the embodiment of the holder.

FIG. 8 is a diagram illustrating a configuration of an embodiment of a push switch.
The figure which provided and provided the contact spring piece in the case.

FIG. 9 is a front view, a plan view, and a right side view of the embodiment of FIG. 8;

FIG. 10 is a front view, a plan view, a bottom view, and a right side view of the box of the embodiment of FIG. 8;

FIG. 11 is a front view, a plan view, a bottom view, and a right side view of the top plate of the embodiment of FIG. 8;

[Explanation of symbols]

 A U-shaped spring piece a Contact piece b Contact piece B Holder C Contact spring piece D Case d Set distance (between contact piece a and fixed contact 7a) E Pressing means (pressing element, push button, etc.) 1 Upper piece 2 Reflex Part 3 lower piece 3a slit 4a upper plate 4b U-shaped part 4c lower plate 5 fulcrum shaft 6 fitting recess 7a fixed contact 7b fixed contact 7A terminal 7B terminal 8 housing 9 top plate 9a engagement piece 9b engagement hole 10 slit 11 Front and rear side plates 12 Recess 13 Left and right side plates 13a Small protrusions 14 Stopper part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 21/00 H01H 13/52

Claims (9)

(57) [Claims] 1. A U-shaped spring piece comprising an upper piece, a bent portion and a lower piece, a U-shaped spring piece having a lower piece divided into two contact pieces, an upper plate, a U-shaped part and a lower piece. The U-shaped portion is provided with a fulcrum shaft, and a U-shaped fitting groove or a fitting concave portion is formed on the inner surface side of the upper plate, the U-shaped portion and the lower plate to fit the recurved portion of the U-shaped spring piece. A curved portion of the U-shaped spring piece is fitted into the fitting groove or the fitting concave portion of the holder in a state of energy storage by compressing the upper piece and the lower piece of the U-shaped spring piece inward. And a contact spring piece in which the holder and the U-shaped spring piece are integrated. The contact spring piece is rotatably supported at a set position with its fulcrum shaft, and one contact piece is connected to one fixed contact. To the upper plate of the upper plate of the holder or the U-shaped spring piece. Set up as a state that was received by colliding with the stopper portion,
The other contact piece is positioned at a position above the fixed distance of the other fixed contact, and a pressing means such as a presser or a push button is provided on the upper plate of the holder or the upper piece of the U-shaped spring piece. A push switch that is provided for. 2. The pusher according to claim 1, wherein the U-shaped spring piece is provided by dividing a lower piece of a U-shaped spring piece consisting of an upper piece, a bent portion and a lower piece into two contact pieces. switch. 3. A strip-shaped contact piece provided by cutting a U-shaped spring piece into a lower piece of a U-shaped spring piece comprising an upper piece, a bent portion and a lower piece. The push switch according to claim 1, wherein the push switch is provided separately for two contact pieces of a contact piece provided therearound. 4. A U-shaped spring piece comprising a double U-shaped spring piece and a lower piece of a U-shaped spring piece consisting of an upper piece, a bent portion and a lower piece divided into two contact pieces. Two U-shaped spring pieces are provided by being inserted and overlapped, or two U-shaped spring pieces in which the tip of the lower piece of a U-shaped spring piece consisting of an upper piece, a bent portion, and a lower piece are used as one contact piece. The push switch according to claim 1, wherein the push switch is provided so as to include two contact pieces. 5. A holder comprising an upper plate, a U-shaped portion and a lower plate, provided with a fulcrum shaft in the U-shaped portion, and a curved portion of a U-shaped spring piece on an inner surface side of the upper plate, the U-shaped portion and the lower plate. Or a U-shaped fitting groove or fitting recess formed therein, or an upper plate, a U-shaped portion, and a lower plate, and a pressing member in the shape of a chevron plate on the upper plate. Are integrally provided with the pressing means of
A U-shaped fitting groove or fitting recess for fitting a reflex portion of a U-shaped spring piece on the inner surface side of the upper plate, the U-shaped portion, and the lower plate, provided with a fulcrum shaft in the U-shaped portion. Further, it is provided with a dielectric such as plastic or a conductor such as metal. The push switch according to claim 1. 6. The contact spring piece has a reversing portion of a U-shaped spring piece in a fitting groove or a fitting concave portion of a holder, and has an upper part and a lower part of the U-shaped spring piece compressed inward. The push switch according to claim 1, wherein the push switch is fitted in a state, and the holder and the U-shaped spring piece are integrally provided. 7. The pressing means may be an angled plate-shaped or other pressing member integrally projecting on the upper plate of the holder of the contact spring piece, or may be formed on the upper plate of the holder of the contact spring piece or on the upper plate of the contact spring piece.
The contact spring piece is centered on the fulcrum axis of the holder by pressing a separate presser, push button, push pin, or other upper plate of the holder or the upper piece of the U-shaped spring piece installed on the upper piece of the U-shaped spring piece. 2. The push switch according to claim 1, wherein any means capable of rotating as is used. 8. A fixed contact is provided on an inner bottom surface of a box having an upper surface opening, the terminal is protruded to the outside, an insertion hole or a slit for a pressing element is formed in a part of a top plate covering the upper surface opening, and a side plate is provided. A case having a concave portion or a shaft hole for a fulcrum bearing is provided, a contact spring piece is pivotally supported in a housing of the case with a fulcrum shaft of the holder in the concave portion or the shaft hole, and one contact piece is fixed to one fixed contact. After inserting and placing the other contact piece in a state in which the other contact piece is positioned at a position above the fixed distance of the other fixed contact, the top plate is opened at the top opening, and the engaging piece The small projections protruding from the side plate of the box are engaged and fitted into the engagement holes, and the presser protrudes outside through the insertion holes or slits of the top plate. Receives upward power of holder due to pressure contact with fixed contact Together, they are those provided installed in a state that does not fall off the contact spring piece a box body, the push switch. 9. The case has a fixed contact on the inner bottom surface of the box with the top opening, protrudes the terminal to the outside, and inserts a through hole or a slit for a presser into a part of a top plate that covers the top opening. A small projection in which a concave portion or a shaft hole for a fulcrum bearing is formed in the side plate, and a top plate that covers the upper surface opening is protruded from the side plate of the box in an engaging hole of an engaging piece that is vertically provided at a side end thereof. 9. The push switch according to claim 8, wherein said push switch is detachably mounted by engaging with said push switch.