1. Technical Field
The present disclosure relates to a rotary switch.
2. Description of Related Art
A rotary switch generally includes a base having a plurality of contacts arranged in an arc-shaped array, and a rotary apparatus rotatably installed to the base. The rotary apparatus includes a contact piece connected to the contacts with friction. However, after the rotary switch has been used for a long time, the contact piece may become worn, resulting in a shortening of the service life of the rotary switch.
Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, all the views are schematic, and like reference numerals designate corresponding parts throughout the several views.
The present disclosure, including the accompanying drawings, is illustrated by way of examples and not by way of limitation. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean at least one.
Referring to
The base 20 includes a circular shell 22 and a circular circuit board 24 received in the shell 22. A plurality of resilient contacts 26 is mounted on the circuit board 24, arranged in an arc along a circumference of the circuit board 24.
Referring to
A bottom surface of the first position member 44 forms a zigzag guiding portion 442 undulating up and down. An outer surface of the first position member 44 forms a zigzag first fastening portion 444 in a radial direction of the first position member 44. The guiding portion 442 includes a plurality of triangular protrusions 442a, and a plurality of indentations 442b staggered with the protrusions 442a. The first fastening portion 444 includes a plurality of triangular protrusions 444a, and a plurality of indentations 444b staggered with the protrusions 444a. The protrusions 442a of the guiding portion 442 are respectively corresponding to the protrusions 444a of the first fastening portion 444.
A top surface of the second position member 46 forms a zigzag guiding portion 462 undulating up and down. An outer surface of the second position member 46 forms a zigzag second fastening portion 464 undulating in a radial direction of the second position member 46. The guiding portion 462 includes a plurality of triangular protrusions 462a, and a plurality of indentations 462b staggered with the protrusions 462a. The second fastening portion 464 includes a plurality of triangular protrusions 464a, and a plurality of indentations 464b staggered with the protrusions 464a. The protrusions 462a of the guiding portion 462 are respectively corresponding to the indentations 464b of the second fastening portion 464.
The second position member 46 is received in a lower portion of the receiving space 422. The protrusions 464a of the second fastening portion 464 are respectively latched in the indentations 425 of the support member 42. The protrusions 462a of the guiding portion 462 are respectively located at inner sides of the protrusions 424 of the support member 42, and the indentations 462b of the guiding portion 462 are respectively located at inner sides of the indentations 425 of the support member 42.
The first position member 44 is received in an upper portion of the receiving space 422, and is spaced from the second position member 46. The protrusions 444a of the first fastening portion 444 are respectively latched in the indentations 425 of the support member 42. The protrusions 442a of the guiding portion 442 are respectively located at inner sides of the indentations 425 of the support member 42, and are aligned with the indentations 462b of the guiding portion 462. The indentations 442b are respectively located at the inner sides of the protrusions 424 of the support member 42, and the protrusions 442a are respectively located at the inner sides of the indentations 425. The guiding portion 442 of the first position member 44 and the guiding portion 462 of the second position member 46 cooperatively bound a zigzag guiding slot 48 undulating up and down, and also undulating in a radial direction of the support member 42.
Referring to
The cover 80 is a circular plate. A middle of the cover 80 defines a circular opening 82 for receiving the rotary plate 682 of the operation member 68. A plurality of labels 84 is formed on a top of the cover 80, arranged in an arc along the opening 82.
Referring to
Referring to
The abutting poles 66 are slid from the corresponding indentations 462b of the guiding portion 462 toward the corresponding protrusions 462a. The end portions 661 of the abutting poles 66 are slid from the corresponding indentations 425 toward the corresponding protrusions 424, deforming the resilient members 64. The rotary pole 62 is slid up along the slot 687, to allow the triggers 624 to move away from the circuit board 24, until the end portions 661 pass over the protrusions 424. The torsion force is removed. The resilient members 64 are restored to bias the end portions 661 to slide into two next indentations 425 of the support member 42. The abutting poles 66 are slid to the next indentations 462b. The rotary pole 62 is slid down along the slot 687, to allow the trigger 624 to move down to contact and trigger the corresponding contact 26.
It is to be understood, however, that even though numerous characteristics and advantages of the embodiments have been set forth in the foregoing description, together with details of the structure and function of the embodiments, the present disclosure is illustrative only, and changes may be made in details, especially in matters of shape, size, and arrangement of parts within the principles of the embodiments to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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2012103095998 | Aug 2012 | CN | national |