KR20040093003A - Switch - Google Patents

Abstract

PURPOSE: A switch is provided to allow for continuous production of contact devices and reduce costs by eliminating the need of using high precision components. CONSTITUTION: A switch comprises a contact device including a movable contact piece(15) with a movable contact(15a) opposed to a fixed contact such that the movable contact contacts or is separated from the fixed contact; a base(20) for accommodating the contact device insert-molded therein, wherein the base permits the movable contact piece and the fixed contact to be checked through eyes; an operating lever(40) having an operating portion(41) protruded from an end thereof, and an arc-shaped operating rib protruded from a lower surface thereof, wherein the operating lever is arranged on the base such the operating lever is rotatable; a return spring(50) arranged in the operating lever such that the return spring provides returning force; and a cover(60) engaged with the base such that the cover prevents escape of the operating lever and the return spring. The operating lever rotates against force of the return spring, by the external force applied to the operating portion of the operating lever in a horizontal direction. The operating rib of the operating lever presses the movable contact piece so as to open/shut a contact.

Description

Switch {SWITCH}

Technical Field

The present invention relates to a switch, in particular a micro switch having a contact mechanism formed by cutting from a lead frame.

Prior art

Conventionally, as a micro switch, there exists a lever switch which can operate in two directions (for example, refer patent document 1).

(Patent Document 1) Japanese Patent Application Laid-Open No. 2002-150885

However, the lever switch described above has a contact mechanism incorporating a movable contact 15 made of a conductive curved spring that is complexly curved into the case 11. For this reason, since the movable contact 15 requires high component precision and assembly precision, it takes time to produce, not only causes cost up, but also tends to cause unstable operation characteristics. In particular, since the movable contact tends to be in a complicated shape and uniform manufacturing is not easy, variations in the precision and operating characteristics of the parts are likely to occur. In addition, since a separate cam is required, there are problems in that the number of parts and the number of assembly operations are high, and the productivity is low.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a low-cost switch which is easy to produce and has stable operation characteristics without requiring high component precision and assembly precision as a component.

In order to achieve the above object, the switch according to the present invention, on the one hand, inserts the contact mechanism which foldably opposes the movable contact located at the free end of the supported movable contact piece to the fixed contact, and inserts the contact mechanism in the vertical direction. A base which the movable contact piece and the fixed contact are visible to the naked eye, an operation lever protruding laterally from one end side, and having a circular arc-shaped operation rib on the lower surface thereof and rotatably provided on the upper surface of the base; A return spring incorporated in the operation lever to impart a return force, and a cover engaged with the base to prevent the operation lever and the return spring from falling off, and based on an external force loaded from the horizontal portion in the operation portion of the operation lever, The operating lever rotates against the spring force of the return spring, and the operating lever of the operating lever That are configured by opening and closing the contacts by pushing down the movable contact piece.

According to the present invention, on the one hand, the movable contact of the movable contact piece supported is foldably opposed to the fixed contact, the movable contact piece is pushed down by the operation rib of the operation lever, and the movable contact is folded to the fixed contact. For this reason, since the high precision and the assembly precision of a component are not required as a component like the conventional example, the switch which is easy to produce and which has stable operation characteristics can be obtained.

In the embodiment of the present invention, the lead frame may be pressed to form a contact mechanism.

According to this embodiment, the contact mechanism can be continuously produced, and the production cost can be reduced.

In another embodiment of the present invention, a plurality of movable contact pieces constituting the contact mechanism are provided together, and the movable contact pieces are pressed and released by means of arc-shaped operation ribs arranged on the rear surface of the operation lever, respectively, to open or close the contacts. good.

According to this embodiment, since a plurality of circuits can be opened and closed, a wide use switch can be obtained.

In another embodiment, at least one of the upper and lower surfaces of the base may be adhesively integrated with the sheet to distinguish the contact mechanism.

According to this embodiment, since the contact mechanism is distinguished, intrusion of the flux at the time of mounting on a printed circuit board can be prevented. In particular, when the sheet is bonded together on the upper and lower surfaces of the base, the contact mechanism can be sealed in a predetermined space, whereby intrusion of dust, corrosive gas, or the like can be reliably prevented. For this reason, operation failure can be prevented, contact reliability can be improved, and life can be extended.

In another embodiment, a swelling surface that mimics the curved movable contact piece may be formed on both sides of the movable contact piece among the upper surfaces of the base, and an upper surface sheet may be adhesively integrated with the swelling surface.

According to this embodiment, the top sheet can be adhesively integrated with the top surface of the base to mimic the curved movable contact piece. For this reason, the operation | movement rib of the operation | movement rib with respect to a movable contact piece can be smoothly performed, smooth contact opening and closing can be performed, the damage | damage of a sheet can be prevented, and life is extended.

In another embodiment, the lower surface sheet may be a double-sided tape having an adhesive applied to its surface.

According to this embodiment, since the switch according to the present invention can be temporarily fixed when the switch is mounted on a printed board, the workability is improved.

1 is an overall perspective view showing a first embodiment of a switch according to the present invention;

FIG. 2 is an exploded perspective view of the switch shown in FIG. 1. FIG.

3 is an exploded perspective view of the switch shown in FIG. 1 viewed from another angle;

4 is a perspective view showing a manufacturing process of the contact mechanism according to the first embodiment.

5 is a perspective view illustrating a manufacturing process following FIG. 4;

6A, 6B, and 6C are a perspective view, a plan view, and a sectional view of the operation lever 40 according to the first embodiment.

7 is an enlarged exploded perspective view of the switch according to the first embodiment;

8A and 8B are perspective views showing the switch during assembly;

9A and 9B are a plan view and a sectional view showing before operation of the switch according to the first embodiment;

10A and 10B are a plan view and a sectional view showing the operation of the switch according to the first embodiment;

11A and 11B are a plan view and a sectional view showing the after operation of the switch according to the first embodiment;

12 is an overall perspective view showing an application example of a contact mechanism according to the present invention;

FIG. 13 is an exploded perspective view of the switch shown in FIG. 12. FIG.

14 is an exploded perspective view of the switch shown in FIG. 12 viewed from another angle;

FIG. 15 is a perspective view showing a manufacturing process of the contact mechanism of the switch shown in FIG. 12; FIG.

16 is a perspective view of a manufacturing process following FIG. 12.

17 is an overall perspective view showing another example of application of a contact mechanism according to the present invention;

18 is an exploded perspective view of the switch shown in FIG. 17.

19 is an exploded perspective view of the switch illustrated in FIG. 17 viewed from another angle;

20 is a perspective view showing a manufacturing process of the contact mechanism of the switch shown in FIG. 17;

21 is a perspective view of a manufacturing process following FIG. 17;

Fig. 22 is an overall perspective view showing another application example of the contact mechanism.

FIG. 23 is an exploded perspective view of the switch shown in FIG. 22;

24 is an exploded perspective view of the switch illustrated in FIG. 22 viewed from another angle;

FIG. 25 is a perspective view showing a manufacturing process of the contact mechanism of the switch shown in FIG. 22; FIG.

FIG. 26 is a perspective view of a manufacturing process following FIG. 22;

The perspective view which shows the manufacturing process of the contact mechanism of 2nd Example of the switch which concerns on this invention.

28 is an enlarged perspective view of FIG. 27B.

29A to 29C are sectional views respectively before, during and after operation of the switch;

<Description of the symbols for the main parts of the drawings>

10... . Contact mechanism 11.. Lead frame,

13, 14, 16... Leads 3a, 16a... Fixed contacts

13b, 14a... Flexure 15... Movable contact piece

15a... Movable contact 20.. Base

21... Sidewall 21c... Notch

21d... Bearing recess 22... Storage recess

23... . Support 24.. Swelling cotton

25... Central axis 30... Back sheet

31... Top sheet 40... joystick

41... Control unit 42. Rib for operation

43.. Guide rib 44.. Insertion axis

46... Pedestal 46a... Center hole

47... Rotating shaft 50.. Return spring

51... Cancer 60... cover

61... Notch portion 62... Engagement hole

An embodiment of the present invention will be described with reference to the accompanying drawings of FIGS. 1 to 29.

1 to 11, a base 20 having a contact mechanism 10 capable of alternating opening and closing of two circuits, and an upper and lower surfaces of the base 20, as shown in Figs. The lower surface sheet 30 and the upper surface sheets 31 and 31, the operation lever 40, the return spring 50, and the cover 60 which are each integrally bonded to each other are comprised.

As shown in FIGS. 4 and 5, the contact mechanism 10 of the base 20 is formed by the lead frame 11 with the tie bar 12 carried out at a predetermined pitch by pressing.

That is, the pair of leads 13 and 14 are carried out from both sides of the tie bar 12 so as to extend, respectively (FIG. 4A). On the other hand, a fixed contact 13a is disposed at the free end of the lead 13, while a movable contact piece 15 is formed at the free end of the other lead 14. Then, after press working on the movable contact piece 15 to bend, press work is formed on the leads 13 and 14, respectively, to form the bent portions 13b and 14a, respectively. The movable contact pieces 15 are brought close to the tie bars 12, respectively (FIG. 4B). As a result, the movable contact 15a of the movable contact piece 15 faces the fixed contact 13a so as to be foldable at a predetermined distance between the contacts (FIG. 4C). After insert molding the base 20 around the tie bar 12 of the lead frame 11 (FIG. 5A), the leads 13 and 14 are cut from the lead frame 11, thereby cutting the base ( 20) is completed (FIG. 5B).

The base 20 protrudes the side walls 21 and 21, respectively, on the upper edges of both sides, and protrudes the central axis 25 between the movable contact pieces 15 and 15. The base 20 is formed with a notch 21c for locking the arm 51 of the return spring 50 to be described later at the upper edge of the side wall 21. Further, a swelling surface 24 for adhesively integrating the top sheet 31 is formed around the base surface of the side wall 21 and around the base of the central axis 25. Further, protrusions 21a and 21b for locking the cover 60 to be described later are formed on the outer surface of the side wall 21, respectively.

Then, the bottom sheet 30 is adhesively integrated on the bottom surface of the base 20, and the top sheets 31 and 31 are adhesively integrated on the bulging surface 24, thereby providing the fixed contact 13a and movable contact. The piece 15 is sealed in a predetermined space. In particular, since the top sheets 31, 31 are integrally bonded to the swelling surface 24, the top sheets 31, 31 themselves are curved to imitate the movable contact piece 15. According to this embodiment, by preventing the intrusion of dust, corrosive gas, etc., there is an advantage that the malfunction of the operation can be prevented, the contact reliability is improved and the life is extended.

In addition, the top sheet is capable of withstanding at least 100,000 to 200,000 opening and closing operations, for example, polyimide and polyethylene fluoride (registered Teflon) are used.

As shown in Figs. 2, 3 and 6, the operation lever 40 is a disk shape which can be rotated around the center axis 25 of the base 20, and an arc shape provided at the upper edge thereof. By using the reinforcing ribs 45, almost triangular-shaped operation portions 41 protrude in the horizontal direction. Moreover, the pedestal part 46 which has the center hole 46a fitted in the center axis | shaft 25 of the said base 20 is provided in the center of the upper surface of the said operation lever 40. As shown in FIG. Moreover, the semi-circular operation rib 42 centering on the said center hole 46a is projected on the lower surface of the said operation lever (FIGS. 6A and 6B).

The return spring 50 is for imparting a magnetic return force to the operation lever 40, and can be stored between the reinforcing rib 45 of the operation lever 40 and the pedestal portion 46. Arms 51 at both ends are latched on the notches 21c of the base 20 and used.

The cover 60 has a planar shape that can cover the upper surface of the base 20, and is engaged with the engaging projections 21a and 21b of the base 20, respectively, on both side walls formed by bending vertically. The notch part 61 and the engagement hole 62 are provided.

In assembling the switch according to the present embodiment, as shown in FIG. 8, the bottom sheet 30 is adhesively integrated on the bottom surface of the base 20 into which the contact mechanism 10 is formed, and at the same time, the base 20 The top sheet 31 is integrally bonded to the swelling surface 24 of. Subsequently, the center hole 46a of the operation lever 40 is inserted into the central axis 25 of the base 20, and then the return spring 50 is inserted into the pedestal portion 46. The arm 51 of the return spring 50 is locked to the notch portion 21c of the base 20. Then, assembling is completed by engaging the notches 61 and the engaging holes 62 of the cover 60 to the engaging projections 21a and 21b of the base 20, respectively (Fig. 1). In addition, the upper and lower surface sheets 30 and 31 are not shown in FIG. 7 for convenience of description.

As shown in FIG. 9, when an external force is applied to the operation lever 40 from the arrow I direction, the operation lever 40 moves the center shaft 25 against the spring force of the return spring 50. Rotate to the center. For this reason, since the operation rib 42 presses down the movable contact piece 15 using the upper sheet 31, the movable contact 15a contacts the fixed contact 13a (FIG. 10). Moreover, when the operation lever 40 is press-fitted, the movable contact 15a will press-contact with the fixed contact 13a by predetermined contact pressure (FIG. 11). Subsequently, when the aforementioned load is released, the operation lever 40 is returned by the spring force of the return spring 50, the movable contact piece 15 is returned to its original position, and the movable contact 15a is fixed. It opens from the contact 13a.

In the above-described embodiment, the case where the lower surface sheet 30 and the upper surface sheet 31 are integrally bonded to the base 20 has been described. However, the lower surface sheet 30 and the upper surface sheet 31 may be suitably used as necessary. , It is not necessary.

In addition, the use of a double-sided tape for the lower surface sheet 30 has the advantage that the switch can be temporarily fixed by positioning the switch on a substrate after separating the switch from the release sheet.

In addition, although the curvature of the said swelling surface 24 is exactly same as the curvature of the curved part of the movable contact piece 15, it is good just to be similar.

In the lead frame 11 according to the present embodiment, for example, as shown in Figs. 12 to 16, the operation lever 40 slides in accordance with an external force from three directions of the left and right and the front, and the two circuits are moved. It can also be applied to switches that are opened or closed. In addition, it demonstrates attaching | subjecting the same number to the same part as the Example mentioned above.

That is, the lead frame by insert-molding the contact mechanism 10 provided from the same lead frame 11 (FIG. 15) as the 1st Example to the base 20 (FIG. 16A), and cutting the leads 13 and 14 is carried out. The base 20 is separated from 11 (FIG. 16B). The bottom sheet 30 is adhesively integrated on the bottom surface of the base 20, and the top sheet 31 is adhesively integrated on the bulging surface 24. Subsequently, the return spring 40 inserted into the insertion shaft 44 of the operation lever 40 is positioned in the storage recess 22 provided in the center of the upper surface of the base 20. Finally, the switch is completed by engaging the notches 61 and the engagement holes 62 of the cover 60 to the projections 21a and 21b of the base 20 (FIG. 12).

Then, by sliding the sliding operation lever 40, the movable rib 43 presses and releases the movable contact piece 15 so that the movable contact 15a folds against the fixed contact 13a, and the left and right sides and the front face are moved. Open and close the other 2 circuits according to the external force in 3 directions.

In addition, in the lead frame 11 which concerns on the above-mentioned embodiment, as for example, as shown in FIGS. 17-21, the operation lever 40 slides according to the external force from 2 directions of a left side and a front side, and 1 It can also be applied to switches that open and close circuits. Incidentally, the same parts as in the above-described embodiment will be described with the same numbers.

That is, similarly to the lead frame 11 of the first embodiment, the pair of leads 13 and 14 are carried out from both sides of the tie bar 12 so as to extend (Fig. 20A). On the other hand, a fixed contact 13a is provided at the free end of the lead 13, and an auxiliary tongue piece 13c serving as a lead is extended. The movable contact piece 15 is extended to the free end of the said other lead 14 which remain | survives, and the auxiliary tongue piece 14b used as a lead is extended. After the press working on the movable contact piece 15 is bent, the press contact is formed on the lead 14 to form the bent portion 14a, thereby forming the movable contact piece 15 on the tie bar 12. Approach For this reason, the movable contact 15a of the said movable contact piece 15 opposes the said fixed contact 13a so that folding is possible at predetermined distances (FIGS. 20B, 20C). After insert-forming the base 20 on both sides of the tie bar 12 of the lead frame 11 (FIG. 21A), the leads 13 and 14 are cut from the lead frame 11, thereby cutting the base ( 20) is completed (FIG. 21B). Since others are almost the same as the above-mentioned application example, description is abbreviate | omitted.

In addition, the lead frame 11 which concerns on the above-mentioned embodiment opens and closes one circuit by the push-in operation lever 40 which drives according to the external force of an up-down direction, for example as shown in FIGS. 22-26. It can also be applied to switches. The same parts as in the above-described embodiment will be described with the same reference numerals.

That is, by insert molding the contact mechanism 10 formed of the lead frame 11 (FIG. 25) similar to the application example mentioned above to the base 20 (FIG. 26A), and cutting the leads 13 and 14, the said The base 20 is separated from the lead frame 11 (Fig. 26B). The bottom sheet 30 is adhesively integrated on the bottom surface of the base 20, and the top sheet 31 is adhesively integrated on the bulging surface 24. Subsequently, the rotation shaft 47 of the rotary operation lever 40 is fitted into the bearing recess 21d formed on the inner side surface of the side wall 21 of the base 20. In addition, the return spring 50 is positioned on the storage recess 48 of the operation lever 40, and the arms 51 and 51 of the return spring 50 are positioned on the base 20 and the cover 60. Respectively). Finally, the switch is completed by engaging the notches 61 and the engaging holes 62 of the cover 60 to the projections 21a and 21b of the base 20, respectively (FIG. 22). However, for convenience of explanation, the top sheet 31 and the cover 60 are not shown in FIG. 22B.

In the above-described embodiment, the case where all have only the open contact has been described. However, the present invention is not necessarily limited to this. For example, as in the second embodiment shown in FIGS. 27 to 29, the open contact 13a is used. And the contact mechanism 10 having the normally closed contact 16a. However, the same reference numerals are given to the same parts as the above-described embodiment, and detailed description thereof will be omitted.

That is, in the contact mechanism 10 of the base 20, as shown in FIG. 27, the tie bar 12 is carried out from the lead frame 11 by pressing. Three sets of leads 13, 14, and 16 are extended from both sides of the tie bar 12 (FIG. 27A). The upper fixed contact 13a is provided at the free end of the lead 13, and the upper closed contact 16a is provided at the free end of the lead 16. As shown in FIG. Further, the movable contact piece 15 extends at the free end of the remaining lead 14, and the auxiliary tongue piece 14b made of lead extends (FIG. 27A).

The lead 11 is pressed to short-circuit the upper fixed contact 13a, while the upper closed contact 16a is bent, and the movable contact piece 15 is bent. For this reason, the movable contact 15a of the said movable contact piece 15 is set to the height located between the upper open fixed contact 13a and the said normally closed fixed contact 16a (FIGS. 27B and 28). In addition, by forming the bent portions 13b and 14a in the leads 13 and 14 by pressing, the upper fixed contact 13a and the movable contact piece 15 are brought closer to the tie bar 12 (Fig. 27C). For this reason, the movable contact 15a of the movable contact piece 15 is located between the opposing upper fixed contact 13a and the normally closed fixed contact 16a, and the said movable contact of the said movable contact piece 15 ( 15a) comes into contact with the normally closed fixed contact 16a.

In addition, after insert-forming the base 20 on both sides of the tie bar 12 of the lead frame 11 (FIG. 27D), the leads 13, 14, and 16 are cut from the lead frame 11. The base 20 is completed by this.

And as shown in FIG. 29, when an external force is loaded on the operation part 41 of the said operation lever 40, the operation lever 40 is press-fitted against the spring force of a return spring which is not shown in figure. For this reason, since the operation rib 42 presses down the movable contact piece 15 using the upper sheet 31, after the movable contact 15a opens from the upper closed fixation contact 16a, the upper fixed contact ( 13a) (FIG. 29B). Moreover, when the operation lever 40 is press-fitted, the movable contact 15a will press-contact the upper fixed contact 13a by predetermined contact pressure (FIG. 29C). Subsequently, when the above-mentioned load is released, the operation lever 40 is returned by the spring force of the return spring, and the movable contact piece 15 returns to its original position, so that the movable contact 15a is the upper fixed contact ( After opening from 13a), it contacts the normal closing contact 16a.

In addition, the contact mechanism 10 having the above-mentioned upper fixed contact 13a and the upper closed fixed contact 16a can be applied to all of the above-described embodiments and applications.

In addition, the switch mentioned above can be applied also when the contact mechanism 10 has only a normally closed contact, and also when the upper fixed contact and the normally closed contact are provided together.

On the one hand, the switch according to the present invention folds the movable contact of the supported movable contact piece into a fixed contact so that the movable contact piece is pushed down by an operation rib of the operation lever and the movable contact is folded into the fixed contact. For this reason, since the high precision and assembly precision of a component are not required with a component like the conventional example, it is easy to produce, and there exists an effect that a cheap switch with stable operation characteristics can be obtained.

Claims (6)

On the other hand, a contact mechanism in which the movable contact located at the free end of the supported movable contact piece is foldably opposed to the fixed contact, a base insert-molded into the contact mechanism, and a movable contact piece and the fixed contact visible in the up and down direction; An operation lever projecting from the one end side to the side and protruding an arc of an operation rib on the lower surface thereof, and provided on the upper surface of the base so as to be rotatable; And a cover which engages with the base to prevent the operation lever and the return spring from falling off, and the operation lever is opposed to the spring force of the return spring based on an external force loaded from a horizontal direction to the operation portion of the operation lever. Wherein the operating rib of the operating lever pushes the movable contact piece to open and close the contact Switch characterized in that. The method of claim 1, A switch comprising a contact mechanism formed by pressing a lead frame. The method according to claim 1 or 2, A switch comprising a plurality of movable contact pieces constituting a contact mechanism, and pressing and releasing the movable contact pieces, respectively, with an arc-shaped operation rib arranged on the rear surface of the operation lever to open and close the contact. The method according to claim 1 or 2, At least one of the upper and lower surfaces of the base, the sheet is bonded and integrated to distinguish the contact mechanism. The method according to claim 1 or 2, A swelling surface that mimics a curved movable contact piece among upper surfaces of the base is formed on both sides of the movable contact piece, and an upper surface sheet is adhesively integrated on the swelling surface. The method according to claim 1 or 2, A switch, characterized in that the lower surface sheet is a double-sided tape coated with adhesive on the surface.