JP2591824Y2 - Switch device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch device for preventing an arc discharge due to chattering which occurs when a switch device used for a power tool or the like is opened.

[0002]

2. Description of the Related Art A conventional switch device includes a Japanese Utility Model Publication No. 577-1.
There is a chattering preventing structure as disclosed in JP-A-8661, but in this structure, the reliability of contact between the common terminal and the brush and contact between the movable contact piece and the brush are low, and this improvement has been awaited.

[0003]

In the conventional double-throw switch device, the structure disclosed in Japanese Utility Model Publication No. 57-18661 for preventing electric corrosion caused by chattering of the common terminal depends on the shape of the common terminal and the brush. Electrolytic corrosion cannot be completely prevented. In addition, when settling of both ends of the brush occurs, there is a problem that the reliability of contact with the movable contact piece is reduced, and as a result, the common terminal is roughened, the temperature rises, and the life is shortened. An object of the present invention is to solve the above problems, prevent chattering, and improve the life of the switch device.

[0004]

Above object to an aspect of the provided square hole in the recess downwardly provided with a recess to the common terminal <br/> on the ends, the lower
Opening of the rectangular center and the lower end of both sides of the center
End extending upward and bent at the upper end
And a substantially W-shaped conductive elastic member
The width below the center of the conductive elastic member
And make the bottom of the center part protrude from the bottom of the recess.
Install a conductive elastic member in the recess so that it contacts
Contacting the upper end of the sexual elastic member to the bottom surface of the movable contact piece is achieved by Rukoto.

[0005]

The conductive elastic member configured as described above is mounted on the upper part of the common terminal so as to sandwich the common terminal, so that the conductive elastic member always maintains the contact state with the common terminal. Also,
By providing slits at both ends of the conductive elastic member, even if a set occurs at one end, the other maintains the contact between the movable contact piece and the conductive elastic member. Prevent chattering between the two sides.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a single-pole double-throw snap switch device, and a case 2 has a common terminal 3 in a substantially central portion and a terminal 5 having fixed contacts 4 and 25 at one end with the common terminal 3 at the center. I have two. A guide plate 6 and a cover 7 are mounted on the upper part of the case 2. An upper portion of the guide plate 6 has a hole at one end, and an operating element 10 with which a spring 8 and an oscillating groove 9 are engaged is mounted in the hole. One end 11 and the other end 1 are inside the case 2.
Movable contact piece 14 each swings in the fulcrum on the end portion 13 of the common terminal 3 projecting into the case 2 while have a movable contact point 12, 26 is attached to the 7.

[0007] a substantially central portion recessed portion 20 to have, below the recess 20 is provided with a square hole 29, substantially W-shaped in the recess 20 of the upper end portion 13 of the upper end portion 13 of the common terminal 3 Jo of the conductive elastic member 21 is installed. The dimensions of the conductive elastic member 21 and the common terminal 3, the length l ₂ is small central portion 22 of the conductive elastic member 21 than the length l ₁ of the concave portion 20
And is more conductive than the length l ₃ of the square hole 29
The length l ₄ of the elastic member 21 is small on whether small quantity. In this embodiment , l ₂ = l ₄ , but it is not always necessary to make them equal.

Further, the width t ₂ of the lower end of the central portion 22 of the conductive elastic member 21 is slightly smaller than the plate thickness t ₁ of the common terminal 3, and the bottom surface of the central portion 22 is recessed. 20 bottom 31
When the conductive elastic member 21 is mounted in the concave portion 20 until the common terminal 3 contacts the common terminal 3, the common terminal 3 is pressed from the left and right as shown by an arrow in FIG. It also functions as a stopper for the terminal 3 in the vertical direction. The width t ₃ is slightly larger than t ₁
This prevents plastic deformation due to spreading when the conductive elastic member 21 is attached to the common terminal 3. One end 27 and the other end 28 of the conductive elastic member 21 are slits 30 respectively.
, But this may be plural.

When the operating element 10 is operated in the direction B as shown in FIG. 1, the energized state between the movable contact 12 and the fixed contact 4 by the arc continues for a short time. During this short time, one end portion 13 of the common terminal 3 and the substantially central portion 18 of the movable contact piece 14 repeatedly contact and non-contact by chattering due to the impact of the collision between the movable contact 26 and the fixed contact 25. At this time, the one end 27 of the conductive elastic member 21 follows while elastically deforming, and the contact between the movable contact piece 14 and the common terminal 3, that is, the energized state is maintained even when the one end 13 and the substantially central portion 18 are not in contact. it can.

Conventionally, when the operating element 10 is operated in the direction B, the conductive elastic member 21 is tilted to the left, and the points A and D are in contact in FIG. , point B, since three points of point D sandwiching the common terminal 3 of a conductive elastic member 21, becomes a surface contact between the point a, the surface and the point C between the point B and the point D and the point D, the conductive Elastic member 21
The contact reliability between the terminal and the common terminal 3 can be greatly improved.
Further, by providing the slits 30 at the one end 27 and the other end 28, each is divided into a plurality of pieces. Even if one of the pieces no longer contacts, the other piece maintains the contact, thereby improving the contact reliability.

When the operator 10 is operated in the direction A,
The operation opposite to the above operation is performed, and the conductive elastic member 21 is similarly operated.
Of the movable contact piece 14
And the energized state of the common terminal 3 can be maintained.

According to the present invention, a recess is provided at the upper end of the common terminal, and a square hole is provided below the recess to open the lower portion .
It extends upward from the substantially rectangular central part and the lower ends on both sides of the central part.
And the upper end bent at the upper end.
The whole is provided with a substantially W-shaped conductive elastic member,
The width below the center of the elastic member is smaller than the thickness of the common terminal
And the bottom of the center will hit the bottom of the recess.
A conductive elastic member is mounted in the recess, and the conductive elastic member is
Contact of the upper end of the
Ri, the conductive elastic member always to follow maintained while the contact between the common terminal and the movable contact piece is elastically deformed to prevent the chattering of the common terminal and the movable contact pieces, it is possible to improve the life of the switch device .

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an embodiment of the switch device of the present invention.

FIG. 2 is a perspective view of a main part of FIG.

FIG. 3 is a front view of a main part of FIG. 1;

FIG. 4 is a perspective view showing a conductive elastic member constituting the present invention.

[Explanation of symbols]

2 is a case, 3 is a common terminal, 4 is a fixed contact, 10 is an operator, 14 is a movable contact piece, 20 is a recess, 21 is a conductive elastic member, 25 is a fixed contact, 29 is a square hole, and 30 is a slot. It is.

Claims (1)

(57) [Scope of request for utility model registration] 1. Two fixed contacts and a pair of fixed contacts at both ends.
A movable contact having a movable contact facing the movable contact and a movable contact
The operating element to be moved and the
The end becomes the pivot point of the movable contact piece and through the movable contact piece.
Common electrically connected to one of two fixed contacts
A switching device having a terminal and a recess at an upper end of the common terminal, and
A square hole with a square hole, and a substantially rectangular center with a downward opening
Extending upward from the lower edges on both sides of the part and folding at the upper edge
Consisting of bent ends, the whole is almost W-shaped conductive
A conductive elastic member is provided, and the width below the central portion of the conductive elastic member is reduced.
Make the thickness smaller than the thickness of the common terminal and
Place the conductive elastic member inside the recess so that it contacts the bottom of the recess
Attach the upper end of the end of the conductive elastic member to the bottom of the movable contact
A switch device characterized in that the switch device is brought into contact with a surface .