JPH0138836Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a rotary switch such as a rotary code switch used for changing the set value of a binary coded decimal code.

This type of code switch has a plurality of contacts 1, which are input/output terminals, as shown in Fig. 1.
A conductor pattern on a printed wiring board (not shown) that rotates with the rotation of a rotor 3 that is rotatably provided in a housing 2 between one pole or two poles as a common terminal and the other pole terminal. Electrical connection/disconnection is achieved through the .

In the conventional rotary cord switch, as shown in FIG. 2, a plurality of contacts 1 are mounted on a base 4 so that the elastic contact pieces 1a are located on the same surface. A conductive pattern (not shown) formed on a printed wiring board 5 is placed opposite the elastic contact piece 1a of the contact 1, and a rotor 3 for rotating the printed wiring board 5 is attached by pressure to both sides of the printed wiring board 5 where there is no conductive pattern. , this reaction force is applied to the elastic contact piece 1 of the contact 1
The structure is such that the necessary contact pressure is obtained from a.

In such a configuration, the rotor 3
It is necessary for the rotor 3 to be easily rotated and to securely hold the rotor 3 at a set position. For this reason, conventionally, as shown in FIG. 2, in the rotor 3, arm parts 3B and 3C are formed on the outer peripheral edge of the disc part 3A, extending concentrically therewith and integrally with the disc part 3A. Approximately circular engaging portions 3B ₁ and 3C ₁ are formed at the tips of the free ends of the arms 3B and 3C. Further, as shown in an enlarged view in FIG. 3, the inside of the housing 2 has a substantially circular depression 2A to allow the rotor 3 to rotate, and the circumferential surface of the depression 2A has a ridge 2B and a valley having a substantially obtuse angle. The portions 2C are formed alternately. As the rotor 3 rotates, the engaging portions 3B 1 and 3C 1 provided at the tips of the arm portions 3B _and 3C engage and disengage from the peak portion 2B and the trough _{portion 2C} , and the rotor 3
can be positioned at the desired position. Note that FIG. 3 2D shows a hole into which the display part of the rotor 3 fits.

However, the recess 2 inside the housing 2
A mountain portion 2 forming an almost obtuse angle formed on the circumferential surface of A
Since each apex 2BT of B is in contact with the periphery of the rotor 3 (indicated by the two-dot chain line in FIG. 3), the engagement parts 3B 1 and 3C ₁ of the arms 3B and 3C that are attached to the arms 3B and 3C as the rotor ₃ is rotated. Although a small amount of deformation allows the rotor 3 to rotate smoothly, there is a possibility that the rotor 3 remains stopped at the apex 2BT of the mountain portion 2B, and reliability is lacking in this respect. Further, because of the above-described configuration, it is difficult to confirm the rotational position of the rotor 3 by manual operation.

The present invention has been developed in view of the above circumstances, and an object of the present invention is to provide a rotary switch whose rotor operates reliably and whose rotational position can be confirmed by manual operation.

The present invention will be explained below with reference to the drawings, but only the housing, which is the gist of the present invention, will be explained here. 4a, b, and c are a plan view, a partially sectional plan view, and a side view of an embodiment of the housing 12 according to the present invention. The housing 12 is shaped like a rectangular cylinder with a bottom, and a through hole 12D into which the head 3D of the rotor 3 (the part marked with an arrow) is formed is formed at the center of the outer bottom surface. 12E is formed. Further, a substantially circular recess 12A is formed inside the housing 12, and on the circumferential surface of the recess 12A, for example, obtuse-angled peaks 12B and troughs 12C are alternately formed, and at each apex 12BT of each peak 12B. Rounded protrusions 12BS protruding toward the center of the depressions 12A are formed, respectively.

Therefore, when the rotor 3 is rotated from the state shown by the two-dot chain line in _{FIG .}
gradually deforms toward the center, deforms to the maximum at the protruding portion 12BS, and depending on the amount of deformation, the arm portions 3B, 3C
Since the engaging portions 3B ₁ and 3C ₁ fit into the trough 12C due to the restoring force generated, the rotor 3 does not stay at the peak or an intermediate position near the peak, as in the conventional case, and the operation is ensured. Furthermore, when the rotor 3 is rotated by hand, it can be confirmed that the engaging parts 3B ₁ and 3C ₁ of the rotor 3 are stuck in the valley part 12C, and furthermore, since there is a protruding part 12BS of the peak part 12B, the rotation of the rotor 3 is confirmed. You can feel a click when operating the device.

In the above embodiments, a flat type was used, but it goes without saying that an indicator type can also be applied.

According to the present invention described above, it is possible to provide a rotary switch that ensures reliable operation of the rotor and allows confirmation of the rotational position of the rotor.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a commonly used rotary code switch, Fig. 2 is an exploded perspective view of the rotary code switch shown in Fig. 1 with the housing removed, and Fig. 3 is an example of a conventional housing. 4a, b, and c are a plan view, partially sectional front view, and side view of the housing of the rotary switch according to the present invention, and FIG. 5 is a bottom view of the housing according to the present invention. 1... A contact having an elastic contact piece 1a, 2,
12... Housing, 3, 13... Rotor, 12
A... hollow, 12B... peak, 12C... valley, 12BS... protrusion, 4... base, 5...
Printed wiring board.

Claims (1)

[Scope of utility model registration request] A substantially disk-shaped rotor is rotatably provided in a circular recess formed in the housing, and obtuse-angled peaks and troughs are alternately formed on the circumferential surface of the recess, and these troughs and peaks In the rotary switch, an engaging portion formed at the tip of an arm integrally formed with the disc portion of the rotor is provided so as to be engageable and detachable by rotation of the rotor, wherein A rotary switch with a rounded protrusion extending toward the center of the rotor at its apex.