Rotary Switch

This invention relates to a rotary switch and, more specifically to a rotary switch which can selectively energize a plurality of output contacts according to a prearranged pattern.

Rotary switches are presently known wherein a plurality of output contacts can be energized in a prearranged pattern by ganging together a plurality of individual switches. Such ganged combinations of switches are, however, relatively complex and complicated to assemble.

According to the present invention, a rotary switch having a plurality of outputs energized selectively according to a prearranged pattern has two switch boards having respective circuit patterns printed thereon and a common slider therebetween. The circuit patterns of one board include a common collector continually engaged by a conductive arm of the slider, and several output contacts spaced so as to be serially engaged by another conductive arm of the slider as the slider is rotated. The circuit patterns of the other board include a plurality of output contacts engaged by other conductive arms of the slider and arranged so that the output contacts of both boards are selectively engaged by a conductive arm of the slider in a predetermined pattern during rotation of the slider.

FIG. 1 is a side sectional view of a switch according to the present invention;

FIG. 2 is a perspective view of a slider support and sliders thereof;

FIGS. 3(a), 3(b), 3(c), and 3(d) are plan views of the first and second switch boards of the present invention for illustrating the switching patterns;

FIG. 4 tabulates the switching operation.

The present invention is explained in detail with reference to the drawings. FIG. 1 is a side sectional view of a switch according to an illustrated embodiment of the present invention and illustrates a shaft 1 rotatably supported by a bearing 2 fitted within an opening of a case 3 formed of insulating material. A plate 4 is formed with a plurality of grooves engaged by a depending portion of a plate spring 5. In this way, a detent operation can be provided for rotation of the shaft 1. A case 6 formed of an insulating material houses respective switch mechanisms 7 and 8 formed by first and second switch boards fixed respectively at the opposing ends of case 6. A closing panel 11 is held to the shaft 1 by a stop ring 12, and a slider support 13 is supported rotatably between the two boards. Two conductive sliders 14 and 15 are connected electrically together by being fitted over staked portions 13b of the slider support.

On the first switch board 7, as shown in II of FIG. 3(a) a semi-circular common contact 16 serving as a collector and a fixed contact 17 having spaced contact points 17b and 17c are formed by printing a silver paste or the like around opposite sides of the shaft hole 7a. The common contact 16 and fixed contact are respectively connected to the common terminal M and terminal A through respective leads 16a and 17a.

On the second switch board, as shown in I of FIG. 3(a) a fixed contact 18 having the contact points 18b, 18c and 18d and a fixed contact 19 having the contact points 19b and 19c are also printed around opposing sides of the shaft hole 8a, and are respectively connected to the terminal C and terminal B through the leads 18a and 19a.

The sliders 14, 15 corresponding to these contacts 16, 17, 18 19 will be explained by referring to FIG. 2 and FIG. 3(a). The slider support has spacers 13c and 13d extending axially from the upper and lower sides of central flange 13a. The spacer 13c is coupled to the detent plate 4 for rotation therewith, and an elongated hole 3e of the spacers 13c and 13d receives a mating portion of the shaft. The slider support 13, therefore, rotates with the shaft 1.

The two sliders 14 and 15 are each formed from a resilient metal plate and fitted to a single surface of the flange 13a of slider 13. The slider 14 has a pair of contactors 14a and 14b turned upwards and the other slider 15 has a pair of contactors 15a and 15b turned downwards. Moreover, as shown in I and II of FIG. 3(a), contact 14a' of contactor 14a and contact 14b' of contactor 14b are arranged diametrically opposite one another, and in the same way the contact 15a' of contactor 15a and contact 15b' of contactor 15b are arranged diametrically opposite one another.

As shown in I of FIG. 3(a), the contacts 14a', 14b' of slider 14 perform switching operation in combination with the contact points 18b, 18c, 18d, 19b, 19c of the fixed contacts 18, 19 of the second switch board 8.

Similarly, the contacts 15a', 15b' of slider 15 also perform switching operation in combination with the common contact 16 and the contact points 17b, 17c of fixed contact 17 of the first switch board 7.

In I and II of FIG. 3(a), the dotted lines respectively indicate the sliders 14 and 15 are connected electrically together.

The operation of the illustrated rotary switch is explained by referring to FIGS. 3(a), 3(b), 3(c) and 3(d).

The condition of I and II of FIG. 3(a) is considered the first contact position. At this time, in I of FIG. 3(a), both contact 14a' of contactor 14a and contact 14b' of contactor 14b are not in contact with any contact point of the fixed contacts 18, 19. Meanwhile, in II of the same figure, the contact 15a' of contactor 15a is in contact with the contact point 17b of the fixed contact 17 and the contact 15b' of contactor 15b is also in contact with the common contact 16. Therefore, the terminal A and common terminal M are connected electrically together.

When the shaft 1 is rotated clockwise (to the second contact position) for one step in the second switch board 8 (opposite direction on the first switch board) from the above condition, the contact 14a' of contactor 14a, in I of FIG. 3(b), is in contact with the contact point 19b of the fixed contact 19, while the contact 14b' of contactor 14b is not in contact with any contact point of the fixed contact 18. Meanwhile, in II of FIG. 3(b), the contact point 15a' of contactor 15a is not in contact with any contact point of the fixed contact 17 and the contact point 15b' of contactor 15b is in contact with the common contact 16. Accordingly, the terminal B and common terminal M are connected electrically together.

When the shaft 1 is further rotated clockwise (to the third contact position) for one step from such condition, in I of FIG. 3(c), the contact 14a' of contactor 14a is not in contact with any contact point of fixed contact 19 but the contact 14b' of contactor 14b is in contact with the contact point 18d of fixed contact 18, while in II of FIG. 3(c), the contact 15a' of contactor 15 is not in contact with any contact point of fixed contact 17 and the contact 15b' of contactor 15b is in contact with the common contact 16. Therefore, the terminal C and common terminal M are connected electrically together.

When the shaft 1 is further rotated clockwise (to the fourth contact position) for one step from the condition of FIG. 3(c), in I of FIG. 3(d), the contact 14a' of contactor 14a and contact 14b' of contactor 14b are not in contact with any contact point of the fixed contacts 19, 18, while as shown in II of the same figure, the contact 15b' of contactor 15b is in contact with the common contact 16 and the contact 15a' of contactor 15a is in contact with the contact 17c of fixed contact 17. Accordingly, the terminal A and common terminal M are connected electrically together.

In the same way, when the shaft is rotated to the fifth and sixth positions, the terminals B, C and common terminal M are connected respectively.

When the shaft 1 is further rotated in the same direction to the seventh, eighth and ninth positions, the terminals A, B, C are sequentially connected to the common terminal M in the exactly same manner as explained above. Such switching operation is tabulated in FIG. 4. The rotation of the shaft 1 may be restricted to an angular range, or may be set endlessly. At any rate, it can be selected easily in accordance with design needs.