JP2563346Y2 - switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a switch, for example, a switch used in a tape recorder, a video deck, or the like, for detecting the presence or absence of an erroneous erasure preventing piece provided on a cassette.

<Prior Art> As shown in FIG. 7, a conventional switch of this type includes a body 71, and two contact pieces 72 and 73 cantilevered substantially in parallel to a block 75 fitted into the body 71, as shown in FIG. The body 71
And a lever 74 which is rotatably supported on the cassette and rotates in accordance with the presence / absence of an erroneous erasure prevention piece of the cassette. When the two contact pieces 72 and 73 come into contact with each other, the magnetic tape recording is performed. It can be erased and cannot be erased if it is separated.

In such a switch, when a cassette having an erroneous erasure prevention piece is loaded, the lever 74 is pressed and rotated by the erroneous erasure prevention piece, and the two contact pieces 72 and 73 are brought into contact with each other, so that erasing can be performed. On the other hand, when the cassette from which the erroneous erasure prevention piece has been removed is loaded, the concave portion below the erroneous erasure prevention piece, that is, the erroneous erasure prevention groove lever 74 fits in, so the two contact pieces 72, Since 73 does not touch, erroneous erasure is prevented.

<Problem to be Solved by the Invention> However, the above-described conventional switch has the following problems.

That is, since the two contact pieces 72 and 73 are cantilevered substantially parallel to the body 71, the thickness of the body 71 is increased. In addition, one of the contact pieces has a role of erecting the lever 74 when no external force is applied to the lever 74. For this purpose, the closer the lever 74 is to the proximal end side of the contact pieces 72, 73, the more advantageous it is. Therefore, the thickness dimension of the body 71 tends to increase.

Since such a switch is provided on the back side of the front panel in a VCR that automatically inserts a cassette,
The thinner the 71, the more advantageous it is in reducing the size of the VCR.

In addition, the two contact pieces 72 and 73 are attached to the body 71 so as to overlap with each other.
It is difficult to insert-mold 71. For this reason,
At present, the contact pieces 72 and 73 are incorporated in the block 75 in advance, and the block 75 is manually incorporated in the body 71.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a switch that can form a thin body and that can automate a manufacturing process.

<Means for Solving the Problems> A switch according to the present invention includes a pair of terminals formed by insert molding by exposing a contact portion on a bottom portion of an insulating body;
A movable contact piece that is cantilevered to the body from the side opposite to the side where the contact portion is exposed, and a contact portion at the tip contacts the contact portion to connect both terminals, and when no external force is applied. A lever rotatably supported to be upright with respect to the body by the elastic force of the movable contact piece. The lever is rotatably supported and vertically movable at the bottom of the body. A lever support portion is provided on the bottom of the body so that the lever not only rotates but also moves up and down in response to the force applied to the lever. It has an opening for sinking and a restricting portion for restricting the amount of rotation of the lever.

<Operation> When no external force is applied to the lever, the lever is in an upright state with respect to the body by the elastic force of the movable contact piece.

When an external force is applied to the lever, the lever rotates, and the contact portion of the movable contact piece contacts the contact portion of the terminal.

<Embodiment> An embodiment according to the present invention will be described below with reference to the drawings.

FIG. 1 is a partially exploded perspective view of a switch according to an embodiment of the present invention, FIG. 2 is a plan view of the switch, FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, and FIG. FIG. 3 is a sectional view taken along line BB of FIG. 3, FIG. 5 is a bottom view of the switch, and FIG. 6 is an explanatory diagram for explaining the operation of the switch.

The switch according to the present embodiment includes a bottom portion of the insulating body 10.
A pair of terminals 40a, 40b exposing the contact portions 41a, 41b on 13
The movable contact piece 20 that connects the terminals 40a and 40b by the contact portion 21 at the tip contacting the contact points 41a and 41b and the elastic force of the movable contact piece 20 when no external force is applied. A lever 30 rotatably supported to be upright with respect to the body 10;
The cantilever is supported from the side opposite to the side where a and 41b are exposed.

The body 10 is formed of an insulating synthetic resin, and at one end thereof, an attachment portion 11 for attaching the switch to the chassis 60 of the electronic device is formed, and at the other end thereof, a taper portion 12 is formed. Is formed as a bottom 13 by one step. In the drawings, reference numeral 16 denotes a rib for reinforcing the strength of the body 10.

A pair of terminals 40a, 40b are provided on the mounting portion 11 side of the body 10.
Are embedded by insert molding, and the corresponding terminals 40a, 40b
Are exposed on one side of the bottom 13 as contact portions 41a and 41b. The contact portions 41a and 41b are formed with two protrusions to ensure the contact of the movable contact piece 20 with the contact portion 21. The other ends of the terminals 40a and 40b protrude from the side surface of the mounting portion 11 of the body 10. The mounting portion 11 has a positioning pin 111 inserted into a positioning hole (not shown) of the chassis 60, and a screw hole 112 for mounting the switch to the chassis 60.

On the other hand, on the side opposite to the side where the contact portions 41a and 41b are exposed, that is, on the taper portion 12 side of the body 10, a contact piece support portion 14 for cantileverly supporting the movable contact piece 20 is formed. The contact piece support portion 14 has a raised portion 141 raised one step from the bottom portion 13, two protrusions 142 projected from the raised portion 141, and a raised portion 141.
And two slits 143 into which the tongue piece 221 formed at the base end 22 of the movable contact piece 20 is inserted.

A lever support portion 15 for rotatably supporting a lever 30, which will be described later, is formed on the inner side of the side wall substantially at the center of the bottom portion 13. The lever support portion 15 includes a protruding wall 151 facing inward from the side wall, an opening 152 formed from the protruding wall 51 to the bottom portion 13, and a rotation restricting portion 153 formed from the protruding wall 151 to the inside. Have.

The movable contact piece 20 has a bifurcated contact portion 21 with a leading end contacting the contact portions 41a and 41b, and a rear end with the contact piece supporting portion 14.
Is formed as a base end portion 22 supported by the base member.

The base end portion 22 has a forked tongue portion 221 inserted into the slit 143 and a round hole 222 into which the projection 142 is inserted. Press-fit projections 223 are formed on both sides of the base end 22. That is, the movable contact piece 2
Reference numeral 0 indicates that the tongue piece 221 is inserted into the slit 143, the projection 142 is inserted into the round hole 222, and the press-fit projection 223 is press-fitted to be supported by the contact piece support portion 14. The movable contact piece 20 is set to have such a size that the contact portion 21 at the tip is located above the contact portions 41a and 41b when supported by the contact piece support portion 14 as described above.

In the lever 30, a pressing portion 32 pressed by the cassette 50 and a rotating shaft 31 protruding from both lower sides of the pressing portion 32 are integrally formed. The lever 30 is rotatably supported with respect to the body 10 by fitting the rotation shaft 31 into the opening 152 of the lever support portion 15.

The lever 30 rotatably supported by the lever support portion 15 includes:
The bottom portion is in contact with the movable contact piece 20, and the movable contact piece 20 constantly applies an upward force. Therefore, the lever
30 is a movable contact piece when no external force is applied
The body 20 is in an upright state with respect to the body 10.

When an external force is applied to the lever 30, the lever 30
As shown by arrow C in FIG. 3, the movable contact piece 20 is pressed and deformed by rotating about a pivot shaft 31 so that the contact portion of the movable contact piece 20 is pressed.
21 contacts the contact portions 41a and 41b. However, since the amount of rotation of the lever 30 is regulated by the regulating portion 153, no excessive force is applied to the movable contact piece 20.

Next, the operation of the switch having the above configuration will be described with reference to FIG.

It is assumed that the switch is mounted on the rear side of the chassis 61 on the front side of the video deck.

The cassette 50 inserted in the video deck is moved and loaded in the direction of the arrow shown in FIG. 6 by an automatic loading mechanism (not shown). At this time, the cassette 50 is
Press 30. Here, a piece for preventing erroneous erasure is removed from the cassette 50.
If the lever 51 has been removed, the lever 30 fits into the recess 52 that has appeared by removing the erroneous erasure preventing piece 51. That is, since the lever 30 is fitted into the concave portion 52 of the cassette 50 in which the loading is completed, the lever 30 is in an upright state with respect to the body 10, and the movable contact piece 20 is in contact with the contact portions 41a and 41b of the terminals 40a and 40b. Does not touch. If the cassette 50 has the erroneous erasure prevention piece 51 remaining, the lever 30 is pressed by the erroneous erasure prevention piece 51 even after the loading is completed, so that the movable contact piece 20 has contacted the contact portions 41a and 41b. Will remain.

Therefore, when the cassette 50 from which the erroneous erasure preventing piece 51 has been removed is inserted, the recorded contents of the magnetic tape are not erased.

In addition, since the contact portion 21 of the movable contact piece 20 slides and contacts the contact portions 41a and 41b of the terminals 40a and 40b, even if rust or the like is generated due to long-term non-use, the contact portion The contact 21 and the contact portions 41a and 41b can always be contacted with high reliability. In addition, the protrusions formed on the contact portions 41a and 41b also improve reliability.

After removing the erroneous erasure prevention piece 51, the cassette 50 may be reused by closing the recess 52 with a pressure-sensitive adhesive tape or the like. A pressure-sensitive adhesive tape or the like is used as a substitute for the erroneous erasure prevention piece 51, but the pressure-sensitive adhesive tape or the like is bent by contact with the lever 30 at the time of loading, and the lever 30 is caught in the concave portion 52 when the cassette 50 is ejected. Sometimes. However, the lever 30 has an opening 152 formed from the protruding wall 151 to the bottom 13.
, The lever 30 sinks toward the bottom 13 side, so that the lever 30 is prevented from being caught.

In the above-described embodiment, the switch according to the present invention has been described as detecting the presence or absence of the erroneous erasure preventing piece 51 of the cassette 50, but may be used as a switch for selecting a recording format.

<Effect of the Invention> The switch according to the present invention includes a pair of terminals that are insert-molded by exposing the contact portion to the bottom of the insulating body;
A movable contact piece that is cantilevered to the body from the side opposite to the side where the contact portion is exposed, and a contact portion at the tip contacts the contact portion to connect both terminals, and when no external force is applied. A lever rotatably supported to be upright with respect to the body by the elastic force of the movable contact piece. The lever is rotatably supported and vertically movable at the bottom of the body. A lever support portion is provided on the bottom of the body so that the lever not only rotates but also moves up and down in response to the force applied to the lever. It has an opening for sinking and a restricting portion for restricting the amount of rotation of the lever. For this reason,
In the case of using this switch, it can be configured to be thinner and smaller than conventional switches of this type. Further, since the terminal is insert-molded in the body, it can contribute to automation of the manufacturing process. Further, since the regulating portion for regulating the amount of rotation of the lever is provided, even if an excessive force is applied to the lever for some reason, the amount of rotation of the lever does not increase, and thus excessive force is applied to the movable contact piece. Is not added. For this reason, since the movable contact piece does not deform, there is no problem of incorrect connection of the terminals due to the deformation of the movable contact piece.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a switch according to an embodiment of the present invention, FIG. 2 is a plan view of the switch, FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, and FIG. 3, FIG. 5 is a bottom view of the switch, FIG. 6 is an explanatory view for explaining the operation of the switch, and FIG. 7 is an exploded perspective view of a conventional switch of this type. . 10 ... body, 13 ... bottom part, 152 ... opening, 20 ... movable contact piece, 21 ... contact part, 30 ... lever, 31 ... rotating shaft, 40
a, 40b ... terminals, 41a, 41b ... contact parts.

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of terminals formed by insert molding with a contact portion exposed at the bottom of an insulating body, and a cantilever supported by the body from a side opposite to a side where the contact portion is exposed, and a contact at a tip end. A movable contact that connects the two terminals by contacting the contact portion, and when no external force is applied, the movable contact is rotatably supported to be upright with respect to the body by the elastic force of the movable contact. And a lever supporter for supporting the lever rotatably and vertically movable is provided at the bottom of the body, and the lever supporter is provided at the bottom of the body, An opening for the pivot axis of the lever to sink, and a restricting portion for restricting the amount of rotation of the lever, so that the lever not only pivots but also moves up and down according to the force applied to the lever. The switch characterized by the above.