JPS5924112Y2 - tambura switch - Google Patents

Description

[Detailed description of the invention] This invention has a U-shaped movable frame pivotably supported on a conductive plate placed opposite to a swinging and reversing operating handle, and one end of a coil spring is elastically attached to the operating handle. This invention relates to a tumbler switch in which the other end of the operating handle is in elastic contact with the bottom surface of the movable frame, and the swinging motion of the operating handle is transmitted to the movable frame by a coil spring to cause the movable frame to reverse operation.

An example of this type of tumbler switch is shown in FIG.

In the figure, reference numeral 1 denotes an operation handle, which is pivotally supported at its substantially central portion by a box 6 so that it can be rotated and reversed, and the upper portion of the box 6 is exposed to the outside through an opening 7 on the top surface thereof.

Reference numeral 2 denotes a conductive plate disposed approximately at the center of the bottom surface of the box 6, and is provided with a protrusion 11 projecting upward.

The U-shaped electrically conductive movable frame 4 has its bottom center placed on the top of the protrusion 11 and can freely see-saw, and has one end attached to the bottom of the operating handle 1. The other end of the coil spring 5 fitted into the recess 9 is fitted into the movable frame 4, and the center of the lower surface of the movable frame 4 is pressed against the top of the projection 11 by the elastic force of the coil spring 5.

Furthermore, a movable contact 12 is provided on the outer wall of the movable frame 4.

In the figure, 13 is a fixed contact that is conductively connected to the terminal plate 14 and faces the movable contact 12, 17 is a terminal plate that is conductively connected to the conductive plate 2, and 15.15 is a locking spring that is inserted from the bottom of the box 6. Each electric wire 16.16 is locked with a terminal plate 14.17, and 18.18 is an unlock button that unlocks the electric wire 16.16 from a locking spring 15.15, and is inserted from the screwdriver insertion slot 19.19. It is driven by a rod such as a screwdriver.

FIG. 1 shows an on state in which the movable contact 12 is in contact with the fixed contact 13, and the coil spring 5 is in a bent state.

From this state, if the upper left side of the operating handle 1 in the figure is pushed to swing and reverse the operating handle 1, the coil spring will be bent from the left side in the figure to a straight and compressed state as shown in Figure 2. The movable frame 4, whose side piece is pushed by the coil spring 5, turns around with the top of the protrusion 11 as the fulcrum 3 and moves away from the fixed contact 13. Separate the movable contact 12.

At this time, the movement of the movable frame 4 to the right in the drawing is stopped by the box 6 and the movable frame 4 coming into contact with each other at a line-symmetrical position shown in FIG. 2a.

Now, in the tumbler switch configured and operated in this manner, the force required to operate the operating handle 1 is the force necessary to compress and straighten the bent coil spring 5, as is clear from the above. be.

Preferably, the force required for this operation is equal for the on-operation and the off-operation, and is smooth.

For this purpose, the point of action of the elastic force of the coil spring 5 on the bottom surface of the movable frame 4 is the center of the movable frame 4 supported by the fulcrum 3, in other words, the elastic force is directed toward the fulcrum 3. Therefore, it is preferable that it is working in this way.

For this purpose, it is necessary that one end of the coil spring 5 that touches the bottom surface of the movable frame 4 contacts the bottom surface of the movable frame 4 at one point in the center of the movable frame 4, or contacts the bottom surface of the movable frame 4 at several places or in a circular shape. becomes.

However, in the past, no such consideration was taken, and therefore the contact point between the coil spring 5 and the movable frame 4 was shifted to the left and right of the fulcrum 3, as shown in FIG. 3a.

Even if the end of the coil spring 5 is treated to eliminate pitch, it is difficult to make the pitch completely zero, so as shown in Figure 3, even in this case there is no contact. The point is shifted to the left and right of the fulcrum 3, and the direction of action of the elastic force of the coil spring 5, indicated by the arrow in the figure, is not directed toward the fulcrum 3.

For this reason, conventionally, the distance l from the swing fulcrum A of the operating handle 1 to the contact point B of the coil spring 5 with the movable frame 4 differs between the on state and the off state, as shown in FIG. There would be a difference in the operating force from to off and from off to on.

Furthermore, since the equilibrium position of the coil unpull ring 5 is shifted from the position shown in FIG. 2, the operational feel will differ in each of the above operations.

The present invention was developed in consideration of these points, and its purpose is to provide a tumbler switch that eliminates the difference in force required during on/off operations and allows smooth switch opening/closing operations. There is something to do.

To explain the present invention below, the present invention has a U-shaped movable frame that is reversibly pivoted on a conductive plate that is placed opposite to an operating handle that swings and reverses, and one end of a coil spring is elastically connected to the operating handle. In a tumbler switch whose other end is in elastic contact with the bottom of the movable frame, a hemispherical protrusion attached to one end of the coil spring and whose top touches the center of the bottom of the movable frame, or attached to the bottom of the movable frame. The feature is that a hemispherical protrusion is provided on the surface of the coil spring in elastic contact with one end of the coil spring. It is designed to face the direction of the fulcrum.

The present invention will be described in detail below based on the illustrated embodiment. FIG. 5 shows the main part of one embodiment.

Note that the other parts are the same as those shown in FIG. 1 and will therefore be omitted.

Now, the U-shaped movable frame 4 whose bottom center rests on the top of the protrusion 11 of the conductive plate 2 is moved to the top of the protrusion 11 by the elastic force of the coil spring 5 disposed between it and the operating handle 1. The coil spring 5 contacts the movable frame 4 and is supported so as to be able to rotate freely using the top as the fulcrum 3.However, one end of the coil spring 5 on the movable frame 4 side does not directly contact the movable frame 4, but is supported via the spring support member 20. are in contact with each other.

The spring support member 20 consists of a hemispherical convex portion 21 and a shaft portion 22 protruding from the flat surface of the convex portion 21.
is connected to one end of the coil spring 5, and the end of the coil spring 5 contacts the flat surface, and the top of the hemispherical surface of the convex portion 21 contacts the center of the bottom surface of the movable frame 4.

Furthermore, since the outer diameter of the coil spring 5 and the spacing between the two side pieces of the movable frame 4 are set to values that allow the coil spring 5 to fit between the two side pieces in consideration of the tolerance variation range, the movability of the convex portion 21 is The position of contact with the bottom surface of the frame 4 does not shift significantly, and even if there is a shift, the value is very small.

Displacement in the plane of the paper is also dealt with by erecting the projecting piece 23.

However, in the case of a lever, the point at which the coil spring 5 applies the elastic force to the spring support member 20 is at a position away from the axis of the spring support member 20 and shifted from the fulcrum 3, and the movable frame 5 and spring support member 20
Since they are in contact with each other near the center of the bottom surface of the movable frame 4 supported by the fulcrum 3, the elastic force of the coil spring 5 acts on the center of the bottom surface of the movable frame 4 supported by the fulcrum 3.

When the operating handle 1 is swung and reversed as described above, the coil spring 5 also reverses its bending direction and presses the side pieces of the movable frame 4, thereby reversing the movable frame 4.

The point of action of the elastic force of the coil spring 5 on the movable frame 4 is a position directly above the fulcrum 3 where the top of the hemispherical convex portion 21 contacts, and this position does not move during the above operation.

Therefore, there is no difference in the force required for the on/off operation, and the stroke to which the operating force must be applied during the entire stroke of the operating bundle 1 is the same for the on/off operation.

FIG. 6 shows another embodiment.

In this case, a hemispherical convex portion 10 is provided at the center of the bottom surface of the movable frame 4, and one end of the coil spring 5 is brought into contact with the surface of this convex portion 10.

Even if there is only one point of contact between the coil spring 5 and the surface of the convex portion 10, or whether there are multiple points of contact, the elastic force of the coil spring 5 always acts in the normal direction of the surface of the convex portion 10, so that the fulcrum 3 The elastic force of the coil spring 5 acts on the center of the bottom surface supported by.

Therefore, even in this case, there is no difference in the force required for on/off operation, and smooth operability can be obtained.

As shown in FIG. 7, the movable frame 4 here has a pair of closely spaced protrusions 25, 25 on one side of its bottom surface, and a pair of widely spaced protrusions slightly above the bottom surface of the other side. 26
．． The box 6 in which the movable frame 4 is arranged has a pair of ribs 27 located on both sides of the movable frame.
, 28, and the one pair of protrusions 25.25
By positioning one rib 27 between them, displacement of the position of the movable frame 4 with respect to the fulcrum 3 is prevented, and by positioning the other rib 28 between the other pair of protrusions 26 and 26, the movable frame The operating range of 4 is restricted.

As described above, in the present invention, it is possible to reliably direct the direction of action of the elastic force of the coil spring on the movable frame toward the pivot point of the movable frame, and therefore, the ON and OFF operations of the operation bundle can be easily directed. There is no difference in operating force between the switches, and a constant on/off operation can be obtained, allowing for light switch opening and closing operations.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the tumbler switch, and FIG. 2a is a cross-sectional view of the tumbler switch. b, C are explanatory views of the same operation as above, Fig. 3 a, l) are sectional views of main parts of the conventional example, respectively, Fig. 4 a, l) are explanatory views of the same as above,
FIG. 5 is a sectional view of a main part of an embodiment of the present invention, FIG. 6 is a sectional view of a main part of another embodiment, and FIG. 7 is an exploded perspective view showing a structure for preventing displacement of a movable frame. In the operating bundle, 2 is a conductive plate, 4 is a movable plate, 5 is a coil spring, and 10.21 is a convex portion.

Claims (1)

[Scope of utility model registration request] A U is placed on the conductive plate facing the operating handle that swings and reverses.
A tumbler switch in which a letter-shaped movable frame is pivotably supported in a reversible manner, one end of a coil spring is in elastic contact with an operating handle, and the other end is in elastic contact with the bottom of the movable frame,
A tumbler comprising a hemispherical convex part attached to one end of a coil spring and whose top touches the center of the bottom surface of the movable frame, or a hemispherical convex part attached to the bottom of the movable frame and with which one end of the coil spring comes into elastic contact with the surface. switch.