JPH0249325A - Rotary switch - Google Patents

Abstract

PURPOSE:To construct a rotary switch flat and small and enhance the contacting stability by driving a movable contact piece of a movable contact piece plate, which is formed approx. flat and in the form of an arc of circle, according to a pattern with uneven surface furnished at the rear side of a rotor. CONSTITUTION:A movable contact piece plate 36 forms a flat plate in the form of an arc of circle consisting of a conductive metal plate, and movable contact pieces 39a-39d and a common contact piece 44 are ring-shapedly arranged around a detect hole 38 bored in its center. The movable contact pieces are composed of bosses 40a-40d and movable contacts 42a-42d. Contact 44a of the common contact piece 44 is furnished in such a way as confronting the movable contact piece 39d. A rotor 54 is equipped on its bottom surface with a circuit plate 70, which is provided with a cam pattern 68 having uneven surface practicable to contact the bosses 40a-40d of movable contact piece 39, and on the oversurface an uneven surface 65 is formed to generate clicks for contacting a spring boss of a case 78. A case 76 is provided with a tab 80 to be detained by caulking with a notch hole 14 in the bottom surface of housing 6 on the bent side wall 77. Thus the construction is made flat and small, and the contacting stability can be enhanced.

Description

[Detailed description of the invention] (Industrial application field) The invention of this application relates to a rotary switch.

More specifically, the present invention relates to the configuration of a small rotary switch.

(Prior Art) One type of rotary switch that has been commonly used in the past will be described with reference to FIGS. 12 to 18 of the accompanying drawings.

In the attached FIGS. 12 and 13, connecting terminals 92, 93 to 96 are provided on a base body 91 by insert molding.

As shown in FIG. 14, these connection terminals 92, 93 to 96 are exposed at the inner bottom of the base body 91 as shown by diagonal lines, and have binary coded decimal codes of 1.2, 4, 8, respectively. The fixed contacts 97, 98 to 100 and the common contact 101 correspond to the above. Further, as shown in FIG. 15, the base 91 has
Movable contact pieces 102+, 1022 to 1025 are provided which are integrally cut out in the two conductive metal plates 102.

The tips of these movable contact pieces 102+, 1022-1025 are formed so that adjacent ones are oriented in opposite directions, and when mounted on the base body 91, the movable contact pieces 102+, 1022-1025 are connected to the fixed contacts 97.98-1OO and the common contact 101. They face each other. Furthermore, the movable contact piece 102+
, 1022 to 1055 are substantially flat, and a protrusion 1026 is formed in each middle portion.

On the other hand, a case 103 is attached to the base body 91. This case 103 is rotatably provided with an operator. The shaft portion 104 of this operator 104. A recess 1042 into which the tip of a screwdriver is inserted, for example, is provided on the tip surface of the screwdriver.
Furthermore, an O-ring 105 for waterproofing and dustproofing is attached to this shaft portion 1041. Additionally, a moderation cam 1 is provided on the surface of the operator 104 along the rotational direction, as shown in FIG.
041 is formed. This moderation cam 1043 has protrusions 106+ and 1 provided on the ring-shaped spring 106.
062 is pressed. This ring-shaped spring 106 is the 17th
As shown in the figure, it is accommodated in a ring-shaped recess 103 provided on the inner surface of the case 103, and in this state, the protrusions 1063 and 1064 are engaged with the notches 10321033 to prevent rotation.

Further, as shown in FIG. 18, a plurality of cams 1044 are formed on the back surface of the operator 104, spaced apart by a predetermined distance in the rotational direction and diametrical direction, and driving the movable contact pieces 1021 to 1022 to 1025. In the figure, a hatched portion 1045 indicates the top of the cam, and tapered portions 1046 and 1047 are formed in front and behind it, respectively. By rotating the operator 104, the cam 10
44 movable contact piece 102+, 1022-102
A predetermined one of 5 is driven, contacts the corresponding fixed contacts 97, 98 to 100 and common contact 101, and a predetermined digital signal is output. Furthermore, the first
The cam 1044 shown in FIG. 8 is for hexadecimal data.

(Problem to be Solved by the Invention) However, in the conventional rotary switch described above, the movable contact pieces are arranged parallel to each other, and the shape of the conductive metal plate of the movable contact piece is square. Therefore, it is difficult to reduce the overall size of the rotary switch.

Furthermore, when the ring-shaped spring is housed in the inner surface of the case, a case with a notch is required to fix it, making it impossible to reduce the height (thickness) of the entire rotary switch. Furthermore, since two parts, the ring-shaped spring and the case, are provided, there are problems such as high manufacturing costs.

The present invention aims to overcome the above-mentioned problems, and has a configuration in which the movable contact piece of the movable contact plate formed in an arc shape and substantially flat is driven by a concavo-convex pattern provided on the back surface of the rotor. To provide a rotary switch whose overall thickness can be made thinner than conventional ones and which has good contact stability.

(Means for Solving the Problem) The following configuration is disclosed as a means for achieving the above object.

By rotating the rotor, the concavo-convex pattern arranged on the bottom surface of the rotor drives the movable contact piece of the movable contact plate housed in the housing in which the contact part of the terminal is arranged on the bottom surface. In a rotary switch that outputs a digital signal, the outer periphery of an arc-shaped movable contact plate in which a movable contact that can contact a terminal contact portion and a movable contact piece that has a protrusion that can come into contact with an uneven pattern are arranged to face each other. A pair of engaging sides are provided on the housing, and these engaging sides are engaged with engaging shoulders provided to correspond to the inner wall of the housing. This rotary switch is characterized in that related members are assembled by caulking ears provided at the ends of the bent side walls of the attached case into notches formed on the bottom surface of the housing.

(Operation) First, when the rotor housed in the housing is rotated, the rotor rotates in a predetermined direction. As the rotor rotates, the circuit board on which the concave-convex pattern is formed on the bottom of the rotor rotates in the same direction, so that the concave-convex pattern comes into contact with one of the protrusions of the movable contact piece. Therefore, energization and de-energization are performed while one of the movable contacts of the movable contact group is in contact with the fixed contact part and the common contact part of the terminal group arranged on the bottom of the housing, and a predetermined digital signal is generated. is output.

In addition, the case, whose ears are caulked into the notches on the bottom of the housing to cover the rotor, allows the rotary switch to be assembled so that it will not fall when removed, and prevents uneven rotation of the rotor, thereby improving the performance of the rotary switch as a whole. .

(Example) An example of the rotary switch according to this application will be described below with reference to the accompanying drawings.

First, as shown in FIG. 3, there are terminal groups 2a and 2b.

2c, 2d, 2e, and 2f are formed by punching a single metal plate P. 2e in the terminal group.

2f is a common terminal. These terminal groups have fixed contact portions 4a, 4b, 4c, and 4d, respectively.

4e (common terminal contact portion) is formed. These terminal groups are provided in the housing 6 by insert molding using an insulating synthetic resin or the like. A bearing hole 8 is provided at the center of the housing 6 for accommodating a dowel 74 of a rotor 54, which will be described later.

Further, end projections 10 and a central projection 12 for mounting a case 76, which will be described later, are formed on both sides of the housing 6, and a notch hole 14 is provided in the bottom surface thereof. Reference numeral 16 is a vertical groove formed by the protrusions 10 and 12.

The structure of the annular inner hole 18 formed in the housing 6 is as follows. A large stepped shoulder 20.22 is symmetrically formed along the wall of the inner hole 18, and further
0.22 with a step lower than this shoulder.
An engagement shoulder 24 and a second engagement shoulder 26 are formed, with a pair of vertical walls 28, 30 on either side of the first engagement shoulder 24 and a pair of vertical walls 28, 30 on both sides of the second engagement shoulder 26. They each have vertical walls 32 and 34.

Next, the movable contact plate 36 accommodated in the annular inner hole 18 of the housing 6 will be explained.

As shown in FIGS. 1, 4, and 5, the movable contact plate 36 of the rotary switch according to the present invention is formed of an arc-shaped flat plate made of a conductive metal plate, and a hole is formed in the center of the movable contact plate 36 of the rotary switch according to the present invention. A plurality of movable contact pieces 39a, 39b, 39c are provided around the engagement hole 38.
, 39d and the common contact piece 44 are arranged in an annular manner. These movable contact pieces each have protrusions 40a, 40b, 40c4.
0d and a movable contact 42a provided at the end.

42b, 42c, and 42d. Also, the contact 44a of the common contact piece 44 faces the movable contact piece 39d.
will be established. A first engaging side 48 having a pair of notches 46a and 46b and a notch 5 are provided on the outer peripheral side of the movable contact plate 36.
0a and 50b are formed.

Next, the rotor 54 rotatably housed within the housing 6 will be described. A slit groove 58 is formed on the upper surface of the head 56 of the rotor 54 into which the end of an operating screwdriver or the like can be inserted. A cam 60 is formed. This moderation cam 60 includes protrusions 6 that protrude from spring members 88a and 88b that are integrally formed with a case 76, which will be described later.
4a and 64b are pressed together, and an O-ring 66 is inserted into the outer peripheral shaft portion of the moderation cam 60 for waterproofing and dustproofing purposes.

Reference numeral 65 indicates a click generating uneven portion provided on the outer periphery of the head 56. Further, as shown in FIG. 11, on the bottom surface of the rotor 54, protrusions 40a, 40b, 40c of the movable contact piece 39 are spaced apart by a predetermined distance in the rotational direction and diametrical direction.

A circuit board 70 is provided on which a plurality of concave and convex cam patterns 68 are formed to contact and drive the circuit board 40d.

A pedestal 72 and a dowel 74 are formed on the bottom surface of the rotor 54. By fitting the dowel 74 into a bearing hole 8 provided at the center of the housing 6, the rotor 54 is attached to the housing via the movable contact plate 36. It is rotatably stored in 6.

The case where the movable contact plate 36 is housed in the annular inner hole 18 of the housing 6 will be described. First, one first engagement side 48 of the movable contact plate 36 enters the first engagement shoulder 24 of the housing, and another second engagement side 52 enters the other second engagement shoulder 26 of the housing. By engaging with the movable contact plate 36, the movable contact plate 36 is housed in the housing 6 in a non-rotatable manner, and the movable contacts 42a, 42b, 42c, 42d are connected to the common terminals 4a, 4b, 4c, 4d, respectively. The contact portion contact 44a is arranged opposite to the contact portion 4e.

Finally, the case 76 will be explained.A window hole 78 that can be engaged with the side wall protrusion 12 of the housing 6 is bored in the bent side wall 77 of the case 76 made of zero elastic material.
A caulking ear portion 80 is formed on the lower side of. Also, a semicircular spring member 88a is defined by a pair of slits 86a and 86b provided on the upper surface of the case 76 facing the hole 84 opening upward.
, 88b have the already described protrusions 64a, 64b.
form.

The movable contact plate 36 is housed in the annular inner hole 18 of the housing 6 as described above, and then the dowel 74 of the rotor is inserted into the bearing hole 8 of the housing 6, and the rotor dowel 74 is inserted into the bearing hole 8 of the housing 6. The case 76 is assembled onto the stand 9 for the dowel holder. The head 56 of the rotor 54 fits into an opening 84 in the case 76 . At this time, the O-ring 66 is fitted into the gap between the case 76 and the rotor 54 and is useful for waterproofing and dustproofing, and the window hole 78 of the case 76 fits into the protrusion 12 of the housing 6 with one touch.
A portion of the window frame 79 fits into the groove 16 formed by the projections 10 and 12 of the housing 6. Furthermore, the window frame 79 on the side wall of the case
The case 76 is assembled into the housing 6 so that it will not fall out by caulking the pair of ears 80 that hang down further into the notch holes 14 formed in the bottom surface of the housing 6. Thereafter, by cutting off the front end of the terminal group and other unnecessary parts, a rotary switch as shown in FIGS. 6, 7, and 8 is completed.

The operating state of the rotary switch of this embodiment assembled as described above will be explained.

First, when the rotor 54 is rotated by applying a screwdriver or the like to the slit groove of the rotor 54, the rotor 54 housed in the housing 6 is rotated in a predetermined direction. The rotor 5
4, the circuit board 70 with the uneven cam pattern 68 formed on the bottom surface of the rotor rotates in the same direction.
b.

Projections 40a, 40b, 40c40 of 39c, 39d
d, so any of these movable contact pieces 42a, 42b.

42c, 42d, 42e and common contact piece 44a
However, the contact portions 4a, 4b, 4c of the terminal group are arranged on the bottom surface of the housing 6 to face these.

4d and the common contact portion 4e are energized and de-energized, so a predetermined digital signal is output. The uneven cam pattern 68 of the circuit board 70 shown in FIG. 11 is for hexadecimal.

(Effects) In the rotary switch of the present invention, since the movable contact plate is formed into an arc shape using a conductive metal plate, its shape and size are improved compared to the conventional example using a square plate. It is possible to make it small and flat.

In addition, by processing the case made of elastic material, the spring member and the case are integrally formed, making it possible to generate a click sound when rotating, so the thickness of the rotary switch itself has been reduced compared to conventional examples. It can be made thinner.

Furthermore, since the movable contact plate is assembled so that the engagement side formed on the outer circumference is engaged with the engagement shoulder formed on the rotor inner hole wall, the movable contact plate can be assembled into the housing inner hole so as not to move. It is crowded. Therefore, it is possible to prevent the movable contact plate from shifting when the rotor rotates, and to eliminate problems when energized or de-energized.

In addition, since the dowel of the rotor is fitted into the bearing hole of the housing using a stand, the rotor can rotate smoothly, and the ears protruding from the edge of the window frame of the case can be caulked. Since it is attached to the notch provided on the bottom of the housing, the related parts can be completely assembled using the case.
In particular, it is effective in preventing rotational deviation of the rotor.

[Brief explanation of the drawing]

1 to 11 illustrate one embodiment of a rotary switch according to the present invention. FIG. 1 is an exploded perspective view of the rotary switch. FIG. 2 is a plan view of the housing in which the terminal group is insert-molded. Fig. 3 is a plan view of the terminal group in a punched state, Fig. 4 is a perspective view of the movable contact plate, Fig. 5 is a plan view of Fig. 4, and Fig. 6.
is a plan view of the assembled rotary switch, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, and FIG. 8 is a cross-sectional view taken along the line ■ in FIG. 6.
A cross-sectional view taken along the line -■, and FIG. 9 is a plan view of the rotor. Fig. 10 is a sectional view showing the engagement of the moderating cam with the protrusion of the case, Fig. 11 is a plan view of a circuit board provided with a concave-convex cam pattern, and Figs. 12 to 18 are conventional rotary switches. FIG. Figures 12 and 13 are cross-sectional views of the rotary switch viewed from different directions, Figures 14 to 18 show the main parts of Figures 12 and 13, respectively, and Figures 14 and 15. 16 is a partially cutaway side view, and FIGS. 17 and 18 are bottom views. 6...Housing, 20.22...Stepped shoulder, 24
...First engagement shoulder, 26...Second engagement shoulder, 3B
--- Movable contact plate, 39.39a, 39b. 39C, 39d,...movable contact piece, 40a, 40b. 40c, 40ri... projections, 42a, 42b. 42c, 42ct...Movable contact, 44...Common contact piece, 44a...Contact, 48...First engagement side, 52
... Second engaging side, 54... Rotor, 60... Moderation cam, 64a, 64b... Protrusion, 65... Click uneven portion, 68... uneven cam pattern, 72... ... Pedestal, 74 ... Dowel, 76 ... Case, 77 ... Bent side wall, 78 ... Window hole, 80 ... Ear part, 86a, 8
6b...Slit, 88a, 88b...Spring member F
IG, 2 FIG, 4 FIG, 5 FIG, 3 FIG. vII KouJ FIG, 7 FIG, 8 FIG, 9 FIG, lo FIG, +2 FIG, +3 FIG, +4 FIG+5 102 doo○25 FIG, +6 FIG, +7 FIG, old

Claims (1)

[Claims] 1. A terminal group is insert-molded and its fixed contacts are provided at the bottom;
A housing in which a common terminal contact is arranged, a movable contact plate that is non-rotatably housed in the housing and has a movable contact that can contact a fixed contact and a protrusion, and a common contact. , a rotor with a concave-convex pattern on the bottom surface that can come into contact with the protrusion of the movable contact piece when rotating, and a concave-convex pattern on the top surface that makes contact with the spring protrusion of the case to generate a clicking sound, and a rotor that can be bent. A rotary switch having a case provided at the end of a side wall and provided with an ear portion that is caulked and engaged with a notch in the bottom surface of the housing. 2. The pair of engagement sides formed on the outer periphery of the movable contact plate are engaged with the pair of engagement shoulders provided on the inner hole wall of the housing, so that the movable contact plate is rotated into the inner hole of the housing. 2. The rotary switch according to claim 1, wherein the rotary switch is housed immovably. 3. The window hole provided in the folded side wall of the case engages with the protrusion provided on the outer wall of the housing, and the ear portion protruding below the window hole is caulked into the notch on the bottom of the housing, making the case unable to fall off. The rotary switch according to claim 1, which is assembled.