JPS5847621Y2 - digital switch - Google Patents

Description

[Detailed description of the invention] This invention is a digital switch, in particular, by rotating a dial with display symbols on the outer circumferential surface, a pattern contact provided on the side of the dial and a contact piece insert-molded on the cover are brought into contact. The present invention relates to a digital switch in which contacts are opened and closed by using the patterned contacts, and the purpose thereof is to provide a digital switch that is sealed in a dust-proof manner in order to improve the contact reliability between the patterned contacts and the contacts.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are examples of the present invention.

The drawing shows a digital switch according to the present invention, which is roughly composed of a case 1, a dial 5, and a cover 12.

The case 1 is open on one side and the top, and has a support shaft 2 integrally protruding from the inner side surface of the central portion.

Further, a spring piece 3 serving as a positioning means is integrally provided on the other side of the case 1, and connection hooks 4, 4 for connecting digital switches in parallel are provided protrudingly.

The dial 5 is rotatably mounted by fitting the center hole 6 to the support shaft 2 of the case 1, and has numbers and trapezoidal protrusions 7 provided adjacent to the outer circumferential surface of the dial 5.
(operation unit) is exposed from the top opening of the case 1.

A triangular unevenness 8 is formed on the inner periphery of one side of the dial 5, and the tip of the spring piece 3 elastically engages with this unevenness 8 to move the dial 5 to 1 in accordance with the number. In addition to positioning each pitch, it also provides a feel when rotating.

On the other side of the dial 5, there is a printed wiring contact 10.
A substrate 9 having a shape is fitted and fixed, and an annular recess 11 is provided around the substrate 9.

The cover 12 is formed by insert molding five contacts 13 to 17, and is attached to the open side surface of the case 1 by fitting or heat caulking.

The upper ends of the contacts 13 to 17 are bent inward and contact the contacts 10 of the board 9 by their own spring force, and the lower ends of the contacts 13 to 17 protrude from the lower surface of the cover 12 and are printed with a print (not shown). It is a DIP type terminal that is connected to the board by automatic soldering.

Note that an opening hole 18 is formed in the cover 12 for bending the upper ends of the contacts 13 to 17, and a sealing plate 19 is adhered to close the opening hole 18.

An annular convex portion 20 is provided on the inner surface of the cover 12, and this annular convex portion 20 rotatably fits into the four annular portions 11 of the dial 5 to form a labyrinth between the two. Prevents dust, etc. from entering the contact area.

The digital switch having the above configuration has contacts 13 to
By directly soldering the lower end of 17 to a printed circuit board (not shown), a mechanical and electrical connection is established.

By operating the protrusion 7 of the dial 5 with a fingertip or the like, the dial 5 is rotated in either forward or reverse direction, and the contacts 10 are opened and closed according to the pattern on the board 9.

In the above embodiment, the dial 5 is provided with a recess 11 and the cover 12 is provided with a protrusion 20 as an annular uneven part, but the present invention is not limited to this.
2 may be provided with a recess.

As is clear from the above description, according to the present invention, a labyrinth is formed by fitting the annular concavo-convex portion of the dial and the annular concave-convex portion of the cover, and a contact is inserted and held in the cover. Since the opening hole for contact processing is closed with a seal plate, the area around the contact part is dust-proof from the outside, and there is no fear of inconveniences such as poor contact.

Moreover, since there is no need to provide a new seal member inside the case for dustproofing, the structure is extremely simple and the overall structure can be made compact.

[Brief explanation of drawings]

Figure 1 is a plan view of two connected digital switches according to the present invention, Figure 2 is a front view with the cover half cut away, Figure 3 is a rear view of the digital switch, and Figure 4 is a rear view of the digital switch.
The figure is a cross-sectional view taken along the line ■V-IV in FIG. 3. 1... Case, 3... Spring piece, 5...
...Dial, 7...Protrusion (operation part), 8
...Irregularities, 9...Substrate, 10...
...Contact, 11...Annular recess, 12...
・Cover, 13-17... Contact, 18...
...Opening hole, 19...Seal plate, 20...
...An annular convex portion.

Claims (1)

[Scope of utility model registration request] The case has one side and the top open, and the case is rotatably mounted inside the case. Display symbols and operation parts are formed on the outer peripheral surface of the case so as to be exposed on the top surface of the case, and printed wiring is printed on one side. a dial fixed to a substrate having contacts and provided with an annular uneven portion around the substrate; a positioning means provided within the case for positioning the rotation angle of the dial pitch by pitch; and an opening of the case. The insert is attached to one side and holds a contact that can come into contact with the contacts of the board, and an opening hole for processing the contact is provided in the center, and the inner surface of the case is connected to the annular uneven part of the dial. A cover with an annular uneven part that fits freely,
A digital switch consisting of a seal plate that closes the processing opening hole of the cover.