JPS5849974B2 - Kogata switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a small switch whose contacts are alternately switched by pressing a push button.

BACKGROUND ART Conventionally, as this type of small switch, for example, the
No. 9679 exists.

That is, as shown in Fig. 4, the base A is equipped with a normally open terminal in the center, a common terminal C and a normally closed terminal 2 at the left and right ends, and the upper and lower terminals of the normally open and closed terminals. Normally open/closed contact E,
A corresponding movable contact plate is provided at the free end of the movable contact plate, and the movable contact plate is supported on the common terminal via an operating lever that moves up and down in response to the push button. The other end of the reversing spring engages with the center of the movable contact plate, and one end of the reversing spring is supported by the common terminal.

An arc is generated at each of the contact portions, and this arc flows in the direction of engagement between the movable contact plate and the reversing spring, and the metal oxide in the arc adheres to the retaining portion.

In particular, if the contact resistance increases, the reversal speed of the movable contact plate will be affected, so if oxides in the arc adhere to the engagement portion, the contact resistance will increase.

By the way, in the above conventional example, the arc firing part and the engaging part C
This type of switch is small in size, and the arc force can easily flow into it without having to install any obstructions or other obstacles between the movable contact plate and the engagement part of the spring. There was not enough space because three terminals were installed in parallel.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned points, that is, a shingle plate is disposed between the arcing part which is the arc generation point and the engaging part of the reversing spring and the movable contact plate, This secures the minimum window hole necessary for the reversal operation of the movable contact plate while shielding other parts, reducing oxides in the arc from scattering and adhering to the retaining part. It is intended to.

DISCLOSURE OF THE INVENTION Embodiments The present invention will be explained based on the drawings as embodiments. 1 is a housing consisting of a base 1a and a cover 1b; 2;
Reference numerals 3.4 denote a common terminal, a normally open terminal, and a normally closed terminal, which are fixed through the base 1a, respectively, with the normally open terminal 3 located in the center, and the common terminal 2 and normally closed terminal 4 located on the left and right sides, respectively.

5 is a U-shaped main shaft metal fitting fixed to the inner end of the common terminal 2, 6
is an operating lever whose other end 6a is bent upward, and its one end 6b is pivotally supported by the rear leg piece 5a of the U-shaped main shaft metal fitting 5.

A movable contact plate 7 has a movable contact 8.8a fixed to the upper and lower surfaces of the free end 7a, and its base end 7b engages with the other end BaK of the operating lever 6.

9 is a spring for reversing the movable contact plate 7, and the other piece 9c is engaged with the middle part of the movable contact plate 7, and the other piece 9b is engaged with the front leg piece 5b of the U-shaped main shaft fitting 5. do.

The other end 6a of the operating lever 6 is arranged to face the lower surface of the intermediate portion of the spring 9.

A push button 10 is slidably attached to the cover 1b, and its inner end passes through the through hole 9a of the reversing spring 9 and faces the other end 6a of the operating lever 6.

Reference numeral 11 denotes an S-shaped shingle plate whose lower end 11a is fixed to the inner end of the normally open terminal 3, and a normally open contact 12 is fixed to the lower surface of its upper end 11b.

The free end 7a of the movable contact plate 7 is passed through the window hole 11c in the middle of the plate 11, and the movable contact 8 is formed on the upper surface of the free end.
are opposed to and away from the normally open contact 12.

11d and 11e are the left and right walls of the window hole 11c, 11f and 1
1g is the upper and lower walls.

Reference numeral 13 denotes a normally closed contact fixed to the inner end of the normally closed terminal 4, which is opposed to the movable contact 8a on the lower surface, and these contacts 8.8a and 12.13 constitute an arcing part X. .

Therefore, the shield plate 11 shields the arcing portion X, the reversing spring 9, and the engaging portion Y of the movable contact plate 7 by extension of the upper portion 411b.

Operation Next, the opening/closing operation of the present invention will be explained. In Fig. 1,
When the push button 10 is pushed in, the other end 6a of the operating lever 6 and the base end 7b of the movable contact plate 7 move downward, and the free end 7a of the movable contact plate 7 is conversely moved upward by the spring force of the reversing spring 9. The reversal operation brings the movable contact 8 and the normally open contact 12 into contact.

Subsequently, when the push button 10 is released, the other end 6a of the operating lever 6 and the base end 7b of the movable contact plate 7 return upward due to the spring force of the reversing spring 9, and the connected contacts 8 and 12 are separated. , and contact 8a.

13 are joined.

At this time, the oxides in the arc generated at the firing part blocked.

That is, in this case, a portion of the oxide in the arc penetrates into the reversing spring 9 side through the window hole 11c, but most of it enters the four surrounding walls 11d and lie.

11f and Ilg, and does not adhere to the engaging portion Y between the movable contact plate 7 and the reversing spring 9.

Effects of the Invention As described above, the present invention engages the other piece 9c of the U-shaped spring 9, which is reversed when the push button 10 is pressed, with the middle part of the movable contact plate 7, and connects it to the normally open terminal 3. The upper end 11b is extended through the window hole 11c from the bent lower end 11a to the movable contact plate 7 at the upper part 1 of the upper movable contact 8, and a normally open contact 12 corresponding to the upper movable contact 8 is provided at the upper end 11b. Since the sash and plate 11 are positioned between the arcing part A part of it scatters from the window hole 11c to the engagement part Y between the reversing spring 9 and the movable contact plate 7, but most of the oxide in the arc is on the left and right sides of the four circumferences of the window hole 11c of the plate 11. Wall lid, lie and upper and lower walls 11
f, 11g and therefore its movable contact plate 7
The contact resistance of the engagement with the reversing spring 9 can be maintained well for a long period of time, and the plate 11 can be used as an essential part for providing the normally open contact 12, and can be used for other purposes. There are advantages such as no need to add any parts.

[Brief explanation of the drawing]

Drawings 1 to 3 show embodiments of the present invention.
FIG. 1 is a sectional view, FIG. 2 is an exploded perspective view, FIG. 3 is a perspective view of essential parts, and FIG. 4 is a sectional view of a conventional example. 1a...Base, 2...Common terminal, 3.
...Normally open terminal, 4...Normally closed terminal, 5...
...Main shaft metal fitting, 7...Movable contact plate, 8,8
a...Movable contact, 9...Reversing spring,
10...Push button, 11...Shiya plate, 1
2... Normally open contact, 13... Normally closed contact, X... Arcing part, Y... Engaging part.

Claims (1)

[Claims] 1 a base 1a, a normally open terminal 3 installed in the center of this base 1a, a common terminal 2 installed at one end of this base 1a, a normally closed terminal 4 installed at the other end, and further A main shaft metal fitting 5 consisting of a front leg piece 5b and a rear leg piece 5a fixed to this common terminal 2, and a downward U-shaped reversing spring in which one piece 9b of both pieces 9b and 9c engages with this front leg piece 5b. 9, one end 6b is supported by the rear leg piece 5a, and a push button 10
an operating lever 6 whose other end 6a facing from below is retracted between both pieces 9b and 9c of the U-shaped reversing spring 9;
The center is supported by the other piece 9c of the U-shaped reversing spring 9, and movable contacts 8, 8a are provided on the upper and lower surfaces of the free end 7a, and the base end 7b is engaged with the other end 6a of the operating lever 6. and the movable contact plate 7 is actuated by the U-shaped reversing spring 9 so that the free end 7a swings downward and the base end 7b swings upward, and the normally closed terminal 4 is further provided with and the fixed contact 1 corresponding to the lower movable contact 8a.
3, a lower end 11a connected to the normally closed terminal 3 passes through the movable contact plate 7, and an upper end 11b is extended at the upper part 1 of the upper movable contact 8, and the upper end 11b corresponds to the upper movable contact 8. A fixed contact 12 is provided for each contact 8.8a, 12.
13, and the U-shaped reversing spring 9 and the engaging portion Y of the movable contact plate 7, and a window hole 11c through which the movable contact plate 7 passes, and this window hole 11c. Surrounding four surrounding left and right walls 11d, lie and upper and lower walls 11f, Ilg
A small switch characterized by being made of a baffle plate 11 consisting of and.