JPS5917059Y2 - switch switching device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a switching device for a changeover switch used in a power distribution board or the like.

FIG. 1 shows a conventional switching device, in which 1 is an operating bearing, 2 is a knob, 2a is a knob shaft bearing on the operating bearing 1, and 3 is a mechanism for tightening the knob 2 to the operating bearing 1 to prevent it from coming off. , A is the cam attached to the knob shaft 2a, A1 is the protruding end of the cam A, A2 is the midsection, A3 is the trough, and 7 is the lid fixedly attached to the operation bearing 1 with the screw 8. Plate 9 is a switch shaft 1 for operating a switch that is slidably supported on the cover plate 7 by receiving the driving force of the cam A.
0 is a push spring that pushes up the A switch shaft 9 in the direction of cam A; 11 is a push spring supported at both ends of the inner walls of the operating bearing 1 so as to be able to slide freely in the axial direction of the switch shaft 9; This is the pin that is being pressed.

FIG. 1 shows a state in which the knob 2 is vertical. If the knob 2 is now rotated to the left inclination (T, direction) of 45 degrees, the pin 11 located in the midsection A2 of the cam A will roll toward the trough A3 of the cam A and come into contact with it.

Therefore, the switch shaft 9, which is pushed upward in the figure by hlo, moves upward.

Next, when the cam A is rotated to the right (in the T2 direction) by 45 degrees from the state shown in FIG. It moves downward against the push spring 10.

In a conventional device having such a function, when the rotation of the knob 2 moves the pin 11 from the tip of the cam A mountain to the midsection A2 of the cam A, if there is momentum in the rotation of the knob 2, the pin 11 will move. There is a risk that the cam A will not stop at the concave part of the midsection of the cam A, but will climb over it and go too far into the trough A3 of the cam A.

In such a case, not only is it impossible to perform the desired switch changeover, but there is also a risk of damage to the equipment.

Therefore, the present invention aims to improve the above-mentioned drawbacks of the prior art, and provides a change-over device for a change-over switch that accurately regulates the knob angle of the change-over switch and at the same time provides a reliable operating feel.

An embodiment of this invention will be described below with reference to FIG.

In the figures, the same reference numerals as in FIG. 1 indicate the same or corresponding parts.

B is a cam having a ring shape that fits loosely on the knob shaft 2a, and B1 is a convex portion projecting downward in the shape of a chevron at two places in the radial direction of the bottom surface of the cam B.

11 is a protrusion that protrudes radially outward from the peripheral wall of the cam B; 12
A longitudinal groove is provided in the inner wall of the operation bearing 1 and is long in the axial direction (in the vertical direction in the figure), into which the protrusion 11 of the cam B is inserted so as to be freely slidable in the longitudinal direction.

Reference numeral 13 denotes a pressing spring that presses the cam against the opposing cam C.

C is a cam that is integrally fixed to the lower end of the knob shaft 2a, and has a cam shape with a crest of C1, a midsection of C2, and a trough of C3 on the lower surface, a concave portion of C4 on the upper surface, and two cams of C5 and C6. Each has a cam shape with a concave portion at the top of a chevron.

Should the tip of switch shaft 9 be pressed against the bottom surface of cam C? , >10.

The push spring 13 of the cam B has a larger constant than the push spring 10 of the switch shaft 9.

In this configuration, FIG. 2 shows the knob 2 in a vertical state, and the tip of the convex portion B1 of the cam B is fitted into the concave portion C4 on the upper surface of the cam C.

If the knob 2 is now rotated to the left (in the T1 direction) by 45 degrees, the cam C will also be rotated in the same way, but the protrusion 11 of the cam B will be restricted in its rotation by the vertical groove 12 on the inner wall of the operating bearing 1. Therefore, the convex portion B1 of the cam B induces the upward movement of the cam B, and the cam C
It is slidably locked in the chevron-shaped top recess C6.

At the same time, the switch shaft 9 slides from the midsection C2 of the cam C to the trough C3 and is pushed up by the force of the push spring 10.

Tilt knob 2 to the right (T2 direction) by 45 degrees from the state shown in Figure 2.
Similarly, when the cam B is rotated, the cam B is lifted and its convex portion B1 is engaged with the concave portion C5 at the top of the cam C, and the switch shaft 9 is slid onto the convex portion C1 of the cam C and is pushed down.

When the knob 2 is returned to the state shown in FIG. 2 from either of the above two rotational states, the tip of the convex part B1 of the cam B falls into the concave part C4 of the cam C by the pressing force of the pressing spring 13; The shock is transmitted through the cam C1 knob shaft 2a and the knob 2 so that the switch operator can reliably get a feeling of operation.
Moreover, the knob 2 can be moved further in either direction than the state shown in Figure 2.
In order to rotate the cam B, it is necessary to lift the cam B against the elasticity of the push spring 13 which has a strong spring force, so it is possible to prevent the knob 2 from being turned too much as in the conventional case and to ensure a secure stop. .

In addition, in the following embodiments, the mountain-shaped convex portion B1 is connected to the cam B.
Although the recess C4 and the chevron-shaped top recesses C5 and C6 are provided on the cam C, it goes without saying that they may be provided on either side.

As described above, according to the present invention, erroneous operation of the changeover switch can be prevented, and the operation feeling is reliable.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conventional device, and FIG. 2 is a longitudinal sectional view showing one embodiment of a switching device according to the present invention. 1... Operation bearing, 2... Knob, 2a... Knob shaft, 9... Switch shaft, 10.13... Pressing spring, 1
1...Protrusion, 12...Vertical groove, B, C...Cam,
B1...Convex part, C2...Middle abdomen, C3...Trough,
C4... concavity, C5, C6... chevron top concavity.

Claims (1)

[Scope of utility model registration request] A drive-side cam C that drives the switch shaft 9 fixed to the knob shaft 2a, and a knob shaft 2 that is loosely fitted to the knob shaft 2a.
The cam B, which is slidably supported in a vertical groove 12 long in the axial direction on the inner wall of the operation bearing 1 of a, is pressed into contact with the cam B by a pressing spring 13 acting on the cam B. A chevron-shaped convex portion B1 is provided on one side, and a chevron-shaped top concave portion C5 where the tip of the convex portion B1 is located when the knob angle is a predetermined leftward inclination angle is provided on the other side, and a chevron-shaped convex portion C5 where the tip of the convex portion B1 is located when the knob angle is vertical. The concave portion C4 formed in the other cam by the convex portion B forms a concave portion C4 in which the convex portion B1 is located, and a concave portion C6 at the top of the convex portion C6 in which the tip of the convex portion B1 is located when the knob angle is at a predetermined rightward tilt angle. , C5, and C6.