JPH051866Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" In this invention, a movable lever equipped with movable contacts and a switching cam are rotatably held on a cam support shaft on an insulating base, and the movable lever and switching A switching spring is locked to the cam, and by rotating the switching cam, the movable lever is reversely driven, and the movable contact is brought into pressure contact with the fixed contact on the insulating base or separated from the fixed contact. Regarding shape switches.

``Prior art'' For example, a rotary switch in which a switching cam is switched by rotating an operator, a switching spring is reversed by switching the switching cam, and the switching operation is performed between the extraction terminals is, for example, a rotary switch. Kosho 43-
This is proposed in Publication No. 16759.

FIGS. 11 to 13 show the construction of the main parts of the conventionally proposed rotary switch. A cam support shaft 12 is erected on an insulating base 11, and the cam support shaft 1
Two ring-shaped grooves 13 and 14 are formed in 2. A switch lever 15 is attached to the lower ring-shaped groove 14.
is engaged in the pore 17 through the keyhole-shaped through hole 16. The switching cam 1 is placed in the upper ring-shaped groove 13.
8 (FIG. 13) are engaged. A pair of protrusions 21 are erected on the switching cam 18, and the operation shaft is fixed and the pin of the operator is attached to the protrusions 21 (not shown).
inserted in between. A switching spring 22 is installed between the switching cam 18 and the movable lever 15. The movable contact plate 23 engages with the tip 24 of the movable lever 15, and the movable contact plate 23 switches and contacts between the extraction terminals 25 and 26, thereby performing a switching operation.

``Problems to be solved by the invention'' In this type of rotary switch, shaft machining is complicated because it is necessary to provide multiple ring-shaped grooves on the cam support shaft 12, and the diameter of the ring-shaped groove portion is small and the cam When fitting the support shaft 12 to the bottom of the insulating base 11, the shaft is likely to be bent. Furthermore, even if the notch 19 of the switching cam 18 is inserted into and engaged with the ring-shaped groove 13, the switching cam 18 will not work until the switching spring 22 is installed between the switching cam 18 and the movable lever 15.
The cam support shaft 12 easily comes off from the cam support shaft 12 and is held unstable, making assembly work extremely difficult.

"Means for Solving the Problem" According to this invention, a through hole through which the cam support shaft is inserted is formed at one end of the switching cam, and the through hole communicates with the end of the switching cam. A slit along the through hole is formed at the end. A shaft engagement protrusion along the circumferential direction is integrally formed on the inner peripheral surface of the end opposite to the insulating base of the through hole, and a ring-shaped groove into which the shaft engagement protrusion is fitted is formed on the inner peripheral surface of the end opposite to the insulating base. is formed at the end of the

Because of this configuration, the cam support shaft
After inserting a movable lever with a movable contact and holding it rotatably, the cam support shaft is inserted into the through hole of the switching cam. After the slit opens slightly due to elastic deformation, the shaft engagement protrusion opens into a ring shape. When the switching cam is fitted into the groove, the interval between the slits narrows, and the switching cam is rotatably held on the cam support shaft. After that, it is only necessary to lock the switching spring between the switching cam and the movable lever, and the assembly becomes extremely simple. The shape of the cam support shaft is also relatively simple and can be easily made.

"Example" Next, an example of this invention will be described by showing its manufacturing method.

First, in FIGS. 1 and 2, the terminals are formed of a hoop-shaped metal plate material. That is, a movable contact contact portion 32 having a hole 31 to which a cam support shaft is joined, and a fixed contact terminal 33 whose tip is bent at right angles to the plate surface are connected to a conveyance belt 36 by terminals 34 and 35, respectively. , these are actually repeatedly formed in parallel to each other in the conveying belt 36.

As shown in FIGS. 3, 4, and 9, an insulating base 40 is formed of synthetic resin by outsert molding onto the hoop-shaped terminal. The insulating base 40 has a rectangular shape and has a continuous sidewall 41 on one side and a part of the adjacent side, and a movable contact contact portion 32 is exposed at the bottom surface of the corner of the sidewall, and a hole communicating with the hole 31 is exposed at the bottom of the corner of the sidewall. is formed. A central hole 42 is formed in the center of the insulating base 40, and a notch 43 is formed on one side of the central hole 42 to expose the bent protrusion of the fixed contact terminal 33. Connecting holes 44 in the other diagonal corners, respectively.
45 is formed, and a connecting strut 46 is formed at the remaining corner part.
is erected. A fan-shaped recess 47 for retracting the tip end of the switching spring and a recess 48 for restricting the movement of the movable lever are provided between the central hole 42 and the connecting column 46. Also, the fan-shaped recess 4
Protrusions 49 are integrally formed at both ends of 7. The ends of the terminals 34 and 35 protrude and are exposed from the insulating base 40.

In FIGS. 5 and 6, the cam support shaft 50 is formed of a turned metal material, and in this example, a tapered flange 51 and a ring-shaped groove 52 are formed at the tip, and a flange edge is formed at the bottom of the cam support shaft 50. 53 and a caulking cylindrical portion 54 is formed below it.

As shown in FIG. 7, the movable lever 60 is formed of a metal plate, has a hole 61 formed in its center, and has a hole 62 at its end through which the cam support shaft 50 is inserted. hole 6
A cut groove 63 for locking a switching spring 68 is formed at the opposing position of the hole 61, and a movable contact 65 and a stopper 66 bent at right angles to the plate surface are formed on both sides of the outer edge of the hole 61.

A through hole 71 through which the cam support shaft 50 is inserted is formed at one end of the switching cam 70, and a slit 72 communicating with the through hole 71 and extending along the through hole 71 is formed at the end of said end. A driving recess 73 is formed at the end opposite to the through hole 71, and a locking hole 74 for receiving the switching spring 68 is formed at the bottom of the driving recess 73. This switching cam 70 is formed as a synthetic resin molder. Further, a shaft engagement protrusion 75 for engagement with the cam support shaft 50 is formed along the circumferential direction on the inner peripheral surface of the end portion of the through hole 71 .

The operator 80 has approximately a disk portion 80a and a cylindrical portion 80b.
The operating piece 8 is attached to the lower surface of the disk portion 80a.
1 is integrally formed of synthetic resin.

The switching spring 68 is made of piano wire and has a substantially arched shape with locking bent portions at both ends.

As shown in FIG. 8, the lid 90 is made of synthetic resin and is formed into a substantially rectangular cylindrical shape with two open faces.
An opening 91 is formed in the center of the plate surface of the lid 90, and side walls 92 are integrally formed on three sides of the periphery that engage with the insulating base 40. The axis of the opening 91 is aligned with the central hole 42 of the insulating base 40, and two connecting holes 92 for connecting with the insulating base and an engagement hole 93 for connecting the connecting support 46 are formed at the four corners of the side wall 92. .

For assembly, the terminals 34 and 35 having the movable contact portion 32 and the fixed contact 33 are inserted into a mold, and the insulating base 40 is formed from synthetic resin by outsert molding.

The cylindrical crimping part 54 of the cam support shaft 50 is inserted into the terminal hole 31 of the exposed movable contact contact part 32 of the insulating base 40 and is crimped onto the movable contact contact part 32 .

Insert the movable lever 60 into the cam support shaft 50, and insert the through hole 71 of the switching cam 70 from above until the shaft engagement protrusion 75 engages with the ring-shaped groove 52 of the cam support shaft 50, and switch with the movable lever 60. cam 7
0 is rotatably held on the cam support shaft 50 without coming off.

One end of the switching spring 68 is locked in the locking hole 74 of the switching cam 70, and the other end is locked in the locking groove 61 of the movable lever 60 while being biased. switching cam 70
By moving the movable lever 60, the movable lever 60 reverses left and right via the switching spring. At this time, the movable contact 65 of the movable lever 60 moves toward and away from the fixed contact 33 of the insulating base 40 . When the movable contact 65 separates from the fixed contact 33, the recess 48 of the insulating base 40
The movable range of the movable lever 60 is restricted by the stopper 66 of the movable lever 60.

While inserting the lower part of the cylindrical part of the operator 80 into the center hole 42 of the insulating base 40, the operation piece 81 moves to the switching cam 7.
0 so as to engage with the drive recess 73.

A movable lever 60, a switching cam 70, a switching spring 68, and an operator 80 are housed in the insulating base 40, and a lid 90 is fitted from above to complete the rotary switch as shown in FIG.

The shaft portion of the operator 80 is exposed from the center hole 42 of the lid 90 and the insulating base 40.
is rotated to move the switching cam 70, and the switching spring 68 causes the movable lever 60 to reversely move, and the fixed contact 33 exposed inside the insulating base and the movable contact 65 provided on the movable lever come into contact and separate, turning the switch on and off. It can be turned off. At this time, the locking hole 74 moves to either side with respect to the line connecting the cam support shaft 50 and the locking groove 63, and a snapping operation is performed.

"Effect of the invention" This invention is particularly effective in the switching cam 70 and the cam support shaft 5.
0 is not maintained by mere insertion, but the shaft engagement protrusion 75 and the ring-shaped groove 52 of the cam support shaft engage with each other through a hook, so that the lid can be removed during the assembly process. The switching cam 70 does not come off before the body 90 is assembled to the insulating base 40.
It has the advantage of being easy to assemble and being able to conduct operational tests during assembly.

Such a rotary switch can be used not only alone but also in an intermediate position of other electronic components by being connected to a rotating shaft of a variable resistor or the like.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the frame terminal, Fig. 2 is a side view of Fig. 1, Fig. 3 is a plan view of the insulating base on which the frame terminal is outsert-molded, Fig. 4 is a partial sectional view thereof, and Fig. Figure 5 is a plan view showing the main parts of the idea.
FIG. 6 is a sectional view of the main parts, FIG. 7 is an exploded perspective view showing each part of the rotary switch of the invention, FIG. 8 is a perspective view showing the inner surface of the lid 90, and FIG. 9 is an insulating base 40. FIG. 10 is a perspective view of the invented rotary switch, FIG. 11 is a diagram showing the main parts of a conventional rotary switch, FIG. 12 is a plan view thereof, and FIG.
The figure is a plan view showing a conventional switching cam.

Claims (1)

[Claim for Utility Model Registration] A cam support shaft and a fixed contact are arranged on an insulating base, and a movable lever with a movable contact and a switching cam are rotatably held on the cam support shaft. In a rotary switch in which a switching spring is locked to a lever and a switching cam, a through hole through which the cam support shaft is inserted is formed at one end of the switching cam, and the through hole communicates with the switching cam. A slit is formed along the through hole at the end of the end, and a shaft engagement protrusion is integrally formed on the inner peripheral surface of the end of the through hole opposite to the insulating base along the circumferential direction. A rotary switch characterized in that a ring-shaped groove into which a shaft engagement protrusion is fitted is formed at an end of the cam support shaft.