JPH0558205B2 - - Google Patents

Description

[Detailed description of the invention] ()...Field of industrial application The present invention is a combination leaf switch with a sealed and rotatable cover for simultaneously closing and opening multiple circuits used in various electrical equipment such as telephones. This is related to.

()...Prerequisite technology Recently, an extremely large number of various micro switches and leaf switches similar to the switch in the present invention are used in parts of computers, electronic audio equipment, and other various electrical equipment that require switch operation. The number of them used is expected to increase dramatically in the future.

Currently, various types of microswitches have a structure in which various contact mechanisms are enclosed in a case made of plastic or the like, and are highly dust-proof.However, the switch mechanism is enclosed in an extremely small case and is operated from outside the case. Due to this necessity, the structure was complicated, and as a result, it had the disadvantage of being brittle and lacking in durability, and it was also expensive.

In this respect, leaf switches have a simple switch mechanism consisting of spring pieces with contacts and are exposed, and are superior in durability and functionality compared to micro switches, as well as being much cheaper. However, on the other hand, since the contact area is exposed, dust tends to adhere to the area, and as the voltage increases due to the contact opening/closing action, this causes dust collection, and even more so, the contact area is exposed. promotes dust adhesion,
As a result, problems such as poor contact and the occurrence of resistance due to poor conductivity appear, and this is becoming a major drawback, especially in the contact action of weak currents in modern computers.

Therefore, the applicant first filed Japanese Patent Application No. 56-202974,
With the title of the invention ``Sealed type cover for leaf switch'' and Japanese Patent Application No. 57-41575, and the title of the invention ``Sealed and rotatable type cover for leaf switch'', the entire switch mechanism of leaf switch, that is, insulation. The entire switch mechanism protruding from one side of the multiple contact spring pieces buried parallel to the base, except for the terminal parts protruding from the other side, is sealed and rotated while the contacts can be opened and closed from the outside. It is covered with a movable cover, which provides the above-mentioned dust-proofing effect especially on the contacts, and also allows the switch operation (opening and closing of the contacts) to be performed as before without any problems. In addition, he invented and applied for patent application No. 173687 (1973), the title of the invention is "Sealing and Rotatable Cover for Dual Leaf Switch" and
- No. 246461, the title of the invention was ``Sealing and Rotatable Cover for Dual Leaf Switch'', but
The present invention is an improvement of the third and fourth inventions, which are developed from the techniques of the first and second inventions.

()...Configuration of the present invention That is, the configuration of the present invention will be explained with reference to its embodiments. (i)...A plurality of parallel contact spring pieces 2a, 2b, 2c are mounted on a common base (insulating) 1. . . . constitutes a multiple leaf switch A in which multiple sets of switch mechanisms S are installed in parallel, and on the other hand, a space C having a size and shape to accommodate all of the switch mechanisms S of the multiple leaf switches installed in parallel is provided; A cover B having an appropriate engagement protrusion 3 formed on the inner surface of C, for example, the inner surface of the tip.
, cover all of the switch mechanisms S, and fit
The vicinity of both sides of the opening 4 is rotatably attached to both sides of the common base 1 by fitting the pivot 5 and the shaft hole 6, and the engaging protrusion 7 at the tip of the movable contact spring piece 26 is connected to the cover B. In addition, a coil spring 10 is tensioned between a part of both side surfaces of the common base 1 and the cover B, for example, between the small protrusions 8 and 9, and the contractile force is applied to the engagement protrusion 3. Therefore, the tip of the cover B is urged upward to keep it in constant pressure contact with the stopper 12 of the base extension plate 11, the cover B is pressed downward with an appropriate pressing force P, and the coil spring is released by releasing the pressure. 10 is expanded and contracted to rotate the cover B about the pivot 5, and the movable contact spring piece 26 engaged with the engagement protrusion 3 of the cover is recurved, thereby opening the contact 2b'. Fixed side contact spring pieces 2a, 2
In a twin leaf switch with a sealed and rotatable cover, which opens and closes the contacts of each switch mechanism S at the same time by connecting and separating the contacts 2a' and 2c' of c, the movable side contact spring piece unit b is The movable side contact spring pieces 2b are buried in parallel in the base unit 1b,
From the base unit 1b to each movable side contact spring piece 2
A stay 1b' is integrally provided in parallel with b, and a common engagement protrusion 7 is embedded in the contact end of each movable contact spring piece 2b, and the fixed side contact spring piece unit a , c, the fixed side spring pieces 2a and 2c are buried in parallel in the base units 1a and 1c, and the engaging protrusion pieces 13 are embedded in each of the fixed side contact spring pieces 2a and 2c, on the common base 1. The movable side contact spring piece unit b
The base units 1a, 1b, 1c of the fixed side contact spring pieces a, c are appropriately fixed in a stacked state, and the contact 2a' of each movable side contact spring piece 2b and the fixed side contact spring pieces 2a, 2c is made. , 2b', 2c' are made to face each other, and each fixed side contact spring piece 2a, 2
The tips of the movable contact spring pieces 2b are elastically urged so that the engagement protrusions 13 come into pressure contact with the tips of the stays 1b' when no load is applied, and the base units 1a, 1b, 1c are The terminal parts 2a'', 2b'', and 2c'' protruding on the opposite side of the common base 1 are inserted into the terminal fitting holes 14 of the common base 1 and protrude from the lower surface of the common base 1. set (illustrated example,
This is an associative leaf switch A in which three sets of switch mechanisms S are installed in parallel.

(ii)...Furthermore, the present invention provides a continuous leaf switch with a sealed and rotatable cover according to the present invention having the above structure, which covers the terminal portion of the switch mechanism S, the base unit, and the upper portions of the parallel spring pieces. , an electrostatic protection cover 16 having a shape of a bent rectangular plate and having a plurality of small pillars 15 integrally protruding from the lower surface of the cover of the base unit is provided separately, and the small pillars 15 of the static electricity protection cover 16 are movable. Each base unit 1a, 1b, 1 of side contact spring piece unit b and fixed side contact spring piece unit a, c
c and the small hole 18 of the common base 1, and the lower end of the small pillar 15 is melted and caulked to the lower surface of the common base 1 to secure the static electricity protection cover 16, the movable contact spring piece unit b, and the small hole 18 of the common base 1. Fixed side contact spring unit a, c
are integrally fixed to the common base 1, and the terminal portion 2a'' of each switch mechanism S, the base unit 1a
The upper part of the fixed side contact spring piece 2b is covered with an electrostatic protection cover 16 for electrostatic protection.

Then, a cover B is fitted over the mechanism S of the twin leaf switch A constructed as in (i) and (ii) above, and the pivot 5 is attached to both sides of the common base 1 near both sides of the opening 4. The common engagement protrusion 7 at the tip of the movable contact spring piece 2b engages with the engagement protrusion 3 of the cover B, and the common base 1 A coil spring 10 is stretched between the small protrusions 8 and 9 of the cover B, and the contracting force of the coil spring 10 urges the tip of the cover B upward so that it is constantly pressed against the stopper 12 of the base extension plate 11. This is a combination leaf switch with a sealed and rotatable cover.

()...Function In the above configuration, when the switch of the present invention presses the cover B downward with an appropriate pressing force P,
By expanding and contracting the coil spring 10, the cover B rotates about the pivot 5, and the movable contact spring pieces 2b, in which the common engagement protrusion 7 is engaged with the engagement protrusion 3 of the cover B, are all moved in an interlocking reaction. In the illustrated example, the contacts 2b' of the movable contact spring piece 2b that were in contact with the contact 2a' of the upper fixed contact spring piece 2a are separated (OFF) all at once.
Then, the contacts 2b' contact (turn ON) the contacts 2c' of the lower fixed side contact spring pieces 2c all at once.

That is, the contacts of each switch mechanism S of the twin leaf switch A are opened and closed at the same time.

()...Effects (1) When configuring a linked leaf switch in which a plurality of sets of switch mechanisms are installed in parallel on a common base, the present invention provides a structure in which a plurality of contact spring pieces are embedded in a base unit in parallel. The movable contact spring piece unit and the fixed side contact spring piece unit are configured as a unit, and the base units are appropriately stacked on a common base to form a linked leaf switch. It is sufficient to mold each individual contact spring piece unit, so the common engagement protrusion, the engagement protrusion,
Even switch mechanisms with complex structures such as stays have the advantage of being relatively easy to configure into units, and the units can be assembled and configured. Even switch mechanisms such as parallel connected switches, base parts, contact spring pieces, and various other special additional structures can be easily constructed by unit molding and assembly. It has its features.

(2)...Also, in switches for telephones, etc., it has become a challenge to effectively protect against static electricity below the standard value (e.g. 10,000V) in order to prevent the generation of noise due to static electricity sparks. The only way to protect against static electricity is to set the distance (total surface distance) from the outside of the switch (insulated part) to the contact spring piece (conductive part) as long as possible. ing.

In this regard, in the present invention, since the terminal part and the upper part of the contact spring piece of the twin leaf switch are widely covered with the electrostatic protection cover, the static electricity is transmitted through the outer peripheral surface of the cover and then detoured to the inside of the cover. In order to reach a conductive part such as a contact spring piece, it is possible to set a long surface distance therebetween, which has the effect of suppressing static electricity in the conductive part below a standard value.

(3)...Furthermore, a small pillar is integrally provided on the lower surface of the static electricity protection cover, and the small pillar is penetrated through the small hole of each base unit and the common base, and is melted and caulked on the lower surface of the common base. In this way, the electrostatic protection cover is effectively used both as a protection against static electricity and as a connector for assembling multiple switches.

If the base unit and the common base are fixed by melt caulking on the top surface of the base unit, there is a risk that static electricity will flow inside from the caulking part. There is also the advantage that this fear can be eliminated by making it the lower surface.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of one embodiment of the switch of the present invention, FIG. 2 is a partially cutaway plan view of FIG. 1, and FIG.
The figure is a partially cutaway front view of the cover, Figure 4 is a partially cutaway plan view of Figure 3, Figure 5 is a front view, top view and bottom plan view of the common base, and Figure 6 is the upper fixed side. A front view and a plan view of the contact spring piece unit, FIG. 7 is a front view and a plan view of the movable contact spring piece unit, FIG. 8 is a front view and a plan view of the lower fixed side contact spring piece unit, and FIG. are a front view and a bottom view of the electrostatic protection cover. Code, A...Twin leaf switch, B...Cover, S...Switch mechanism, P...Pushing force, a, c
...Fixed side contact spring piece unit, b...Movable side contact spring unit, 1...Common base, 1a, 1b, 1
c...Base unit, 1b'...Stay, 2a, 2
c...Fixed contact spring piece, 2a', 2c'...its contact, 2a'', 2c''...its terminal part, 2b...movable contact spring piece, 2b'...its contact, 2b''... Terminal portion, 3... Engagement protrusion, 4... Opening, 5... Pivot, 6... Shaft hole, 7... Common engagement protrusion, 8, 9...
... Small projection, 10 ... Coil spring, 11 ... Base extension plate, 12 ... Stopper, 13 ... Engagement protrusion,
14...Terminal fitting hole, 15...Small pillar, 16...Static electricity protection cover, 17, 18...Small hole.

Claims (1)

[Scope of Claims] 1. Constructs a linked leaf switch in which multiple sets of switch mechanisms each consisting of a plurality of parallel contact spring pieces are installed in parallel on a common base, and on the other hand, all of the switch mechanisms of the linked leaf switch are housed. A cover with an appropriate engaging protrusion (or protrusion) formed on the inner surface of the space is fitted over each switch mechanism, and the vicinity of both sides of the opening is covered with a common base. the movable side contact spring piece is rotatably pivoted to the cover, and the engaging protrusion of the movable contact spring piece is engaged with the engaging protrusion (or protrusion) of the cover;
In addition, coil springs are stretched between the common base and part of both side surfaces of the cover, and the contracting force of the coil springs urges the tip of the cover upward to keep it in constant pressure contact with the stopper of the base extension plate. , Press the cover downward with an appropriate pressing force, and by releasing the pressure, expand and contract the coil spring to rotate the cover about the pivot, and engage the engagement protrusion (or protrusion) of the cover. In a twin leaf switch with a sealed and rotatable cover that opens and closes the contacts of each switch mechanism simultaneously by interlocking the movable side contact spring pieces, the movable side spring piece unit is movable to the base unit. Side spring pieces are buried in parallel, stays are integrally protruded from the base unit in parallel with each movable contact spring piece, and a common engagement protrusion piece is buried at the tip of each movable contact spring piece. At the same time, a fixed side contact spring piece unit is provided by embedding the fixed side spring pieces in parallel in the base unit, and an engaging protrusion piece is embedded in each fixed side contact spring piece, and is installed on the common base. , the base units of the movable contact spring piece unit and the fixed side contact spring piece unit are properly fixed in a stacked state, so that the contact points of each movable side contact spring piece and the fixed side contact spring piece are faced to each other, and each fixed side contact spring piece unit is made to face each other. The tip of the side contact spring piece is elastically biased in one direction of each movable side contact spring so that the engagement protrusion comes into pressure contact with the tip of the stay when no load is applied, and the protrusion protrudes to the opposite side of the base unit. Each terminal part is inserted into a terminal fitting hole of a common base and protrudes from the lower surface of the common base, thereby configuring a linked leaf switch in which a plurality of sets of switch mechanisms are installed in parallel on the common base. A dual leaf switch with a sealed and rotatable cover, featuring: 2. In the interlocking leaf switch with a sealed and rotatable cover as set forth in claim 1, the rectangular plate covering the terminal portion of the switch mechanism, the base unit, and the upper portions of the parallel contact spring pieces is bent. An electrostatic protection cover with a plurality of small pillars integrally protruding from the bottom surface of the cover of the base unit is installed separately, and the small pillars of the static electricity protection cover are connected to the movable contact spring unit and the fixed contact. Insert the spring piece unit into the small hole of each base unit and the small hole of the common base, and melt and caulk the lower ends of the small pillars to the lower surface of the common base to secure the static electricity protection cover, the movable contact spring piece unit, and the small hole of the common base unit. In addition to integrally fixing the fixed side contact spring piece unit to the common base, the terminal part of each switch mechanism,
A twin leaf switch with a sealed and rotatable cover, characterized in that the upper part of the base unit and the parallel contact spring pieces are each covered with an electrostatic protection cover.