JPS5922669Y2 - Changeover switch device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a changeover switch device that stabilizes sliding contact between contacts.

In general, in a rotary switch, which is an example of a changeover switch device, the fixed contact and the movable contact always come into contact at the same part, which tends to cause wear in that part.
Therefore, in order to always obtain the best contact condition, a large contact pressure is required between the fixed contact and the movable contact, which has the disadvantage of requiring a large operating force to rotate the movable contact and shortening the life of the contact. There was a drawback that it became

The present invention was made to eliminate the above-mentioned drawbacks, and its purpose is to stabilize the sliding contact between the contacts, reduce wear on the contacts, extend the life of the contacts, and reduce the rotational operating force of the contacts. It is an object of the present invention to provide a change-over switch device that can reduce the amount of damage caused by the changeover and further reduce the size of the entire device.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Reference numeral 1 denotes a short cylindrical base made of an insulating material, 2 a rotation operation shaft rotatably supported on a bearing (not shown) with its rotation center aligned with the axis A of the base 1, and 3 a rotation operation shaft. It is an operational part fixed to the tip of the operating shaft 2.

Reference numeral 4 denotes a large number of fixed contacts attached to the outer peripheral surface of the base body 1 at predetermined intervals, and these have the same axis A as the base body 1 and have a diameter approximately equal to the outer diameter of the base body 1. The shape is defined as part of a spiral.

Reference numeral 5 denotes a common contact attached to the entire inner circumferential surface of the base body 1, which has the same axis A as the base body 1 and has a shape that forms part of a spiral having a diameter approximately equal to the inner diameter of the base body 1. It is determined.

Reference numeral 6 denotes a support fixed to the rotary operation shaft 2 so as to be able to rotate integrally with the rotary operation shaft 2, and the first support arm 6a thereof has an elongated rectangular column shape oriented in a direction parallel to the axis A of the base body 1. A first movable contact 7 is provided, and the first movable contact 7 is elastically brought into pressure contact with the fixed contact 4.

Further, a second movable contact 8 in the shape of an elongated rectangular column oriented in a direction parallel to the axis A of the base body 1 is attached to the second support arm 6b, and this second movable contact 8 is referred to above. It is elastically pressed against the common contact 5.

Now, when considering the sliding motion between the first movable contact 7 and the fixed contact 4 and between the second movable contact 8 and the common contact 5, it is as follows.

That is, the equation of the spiral 9 as shown in Fig. 3 is Z = b θ (where a and b are proportional constants), and when the spiral 9 is rotated around its axis at a constant angular velocity, The velocity dO at the point where the spiral 9 touches the straight line 10 parallel to the Z-axis is constant, so the velocity of the spiral 9 sliding on the straight line 10 (in other words, the velocity of the Z-axis component> dZ
=bd O is constant.

Furthermore, as is clear from the developed diagram of the spiral 9 shown in the fourth ttctt figure, the speed of the straight line 10 sliding on the spiral 9 (in other words, the speed of the spiral 9 in the direction Sp precept)"=! □The month is also constant.

Therefore, Figure 5 (this is exaggerated for the sake of explanation)
, the first movable contact 7, which is oriented in a direction parallel to the axis A of the spiral, is rotated in the direction of arrow 11 by the rotation operation shaft 2, and is slid onto the fixed contact 4, which is a part of the spiral. If the rotational angular velocity of the rotary operation shaft 2 is constant when the contact is in the position, the relative sliding speeds between the first movable contact 7 and the fixed contact 4 are equal.

Furthermore, the sliding movement between the second movable contact 8 and the common contact 5 is similar to that described above.

Therefore, the sliding contact between each contact is stable, the amount of wear is small, and the degree of wear is uniform throughout, resulting in a long life of each contact.

In addition, since the sliding speeds are equal as described above, the generation of sliding noise can be reduced.Furthermore, since the sliding contact is stable, the contact pressure can be small, and in this respect, the amount of wear can be reduced, and the The operating force required to rotate the first and second movable contacts 7 and 8 is small.

Furthermore, in this embodiment, the cylindrical base 1 is provided, the fixed contacts 4 are disposed on the outer circumferential surface of the base 1, and the common contacts 5 are disposed on the inner circumferential surface of the base 1. It is possible to make effective use of the energy and downsize the entire device.

In the present invention, the shapes of the fixed contact 4 and the common contact 5 are oriented parallel to the axis A of the base 1, and the first and second movable contacts 7 and 8 are oriented parallel to the axis A of the base 1. The fixed contact 4 and the common contact 5 may be provided on the inner periphery and the outer periphery of the base 1, respectively.

In the present invention, the concept of spiral includes curves that approximate each other as long as they produce substantially the same effect.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with appropriate modifications without departing from the gist thereof.

As explained above, the present invention can stabilize the sliding contact between the contacts, reduce the wear of the contacts, extend the life of the contacts, and reduce the rotational operating force of the contacts. The present invention can provide a changeover switch device that can also reduce the size of the entire device.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a partial vertical side view, FIG. 2 is a perspective view of the main parts, and FIGS. 3 to 5 are explanatory views of the operation. In the figure, 1 is a base, 4 is a fixed contact, 5 is a common contact, 7 is a first movable contact, 8 is a second movable contact, and 9 is a spiral.

Claims (1)

[Scope of utility model registration request] A cylindrical base body, a large number of fixed contacts arranged on the outer circumference or the inner circumference of the base body, a first movable contact that slides on these fixed contacts by rotation, and a first movable contact on the inner circumference of the base body. Alternatively, the fixed contact and the first movable contact may include a common contact disposed on the outer periphery and a second movable contact that rotates and slides on the common contact.
one of the movable contacts, and one of the common contact and the second movable contact, each having the same axis as the base body and a constant diameter, or a curved line approximating this spiral; A changeover switch device characterized in that the other of the spirals is shaped to form a part of the spiral, and the other of the spirals is oriented in a direction parallel to the axis of the spiral.