JP4613665B2 - Switch pressing structure - Google Patents

Description

  The present invention relates to a pressing structure of a switch that is provided inside a casing and is turned on when pressed by a tip of a thin tool or the like inserted from a small hole provided in the casing.

In this type of switch, countermeasures against static electricity are taken because static electricity entering from a small hole provided in the housing may cause adverse effects such as destruction of the switch or malfunction. Conventionally, it consists of a switch mounted on a printed circuit board and a switch push button that is provided so as to surround the switch and whose pressing portion protrudes outward from the hole of the case. Static electricity that enters through the hole of the case when the switch is pressed is Since the shield is provided by the push button, there is a switch that restricts the destruction or malfunction of the switch due to static electricity (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 5-250953 (paragraphs “0027” to “0032”, FIG. 1)

  The conventional switch pressing structure described above has a problem in that the number of parts increases because the switch is provided with a dedicated switch push button as a countermeasure against static electricity. In addition, as a countermeasure against static electricity without adding new parts, the distance between the hole of the case and the switch is increased, and the distance through which static electricity flows along the surface of the member, the so-called edge distance is increased. Things have also been proposed. However, with this structure, there are new problems such as poor operability when pressing the switch and unnecessary space is generated in the housing.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to take countermeasures against static electricity without increasing the number of parts.

To achieve this object, the invention according to claim 1 includes a housing provided with a hole into which a needle-like body can be inserted, a bracket formed so as to face the back surface of the housing, and formed of plastic, A switch provided on the back side of the bracket, and a pressing piece formed in the shape of a tongue piece that turns on the switch by elastically deforming and elastically deforming a portion of the bracket facing the hole. The switch pressing structure is provided, and a pressing portion for turning on the switch is hemispherically protruded integrally with the pressing piece, and the width of the pressing piece is larger than the width of the switch so as to cover the switch. Slightly larger .

  According to a second aspect of the present invention, in the first aspect of the present invention, a substrate on which the switch is mounted is provided, and the elastic deformation amount of the pressing piece is regulated at the free end of the pressing piece by contact with the substrate. A restriction section is provided.

  According to the first aspect of the present invention, since the pressing piece is provided between the switch and the hole of the casing, the edge distance between the switch and the hole of the casing becomes long, so the static electricity that enters from the hole of the casing. It is possible to prevent the switch from being broken or malfunctioning due to. Moreover, the number of parts can be reduced by providing the pressing piece integrally with the bracket.

  According to the invention which concerns on Claim 2, since the elastic deformation more than predetermined of a press piece is controlled by the control part, damage to a press piece and destruction of a switch can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an external appearance of an electronic device adopting the switch pressing structure according to the present invention, FIG. 2 is a front view of the main part showing a state where the upper case of the electronic device is removed, and FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.

  An emergency call device as an electronic device generally indicated by reference numeral 1 in FIG. 1 is composed of a lower case 2 and an upper case 3 that are open on one side, and the upper case 2 is supported at one end of the lower case so as to be freely opened and closed. By closing the upper case 3 so that the opening ends of each other face each other, a substantially sealed casing is formed. In FIG. 4, 3a is a small hole provided in the front plate of the upper case 3 corresponding to a small hole 12 described later, and 3b is a rectangular hole provided in the front plate of the upper case 3 corresponding to a window 9 described later. It is.

  In FIG. 1, reference numeral 4 denotes a lock. By unlocking the lock with a key, the upper case 3 can be opened with respect to the lower case 2, and an electronic component mounted on the lower case 2, etc. Maintenance inspection is possible. In FIG. 2, reference numeral 5 denotes a hook-like hook hole provided on the bottom plate of the lower case. By hooking a hook (not shown) attached to the wall into the hook hole 5, an emergency call is made. The device 1 is hung on a wall.

  In FIG. 1, reference numeral 7 denotes an operation panel that covers a part of the front plate of the upper case 3. The operation panel 7 has two windows 8 and 9 formed in a rectangular shape and small speakers for a number of speakers. A hole 10, two small holes 11, 12 and three small holes 13, 14, 15 formed in a rectangular shape are provided. In FIG. 4, reference numeral 17 denotes a control board attached to a boss 18 erected integrally with the lower case 2 by screws 19, on which electronic components (not shown) and the like are mounted.

  The reference numeral 20 in FIG. 3 is a bracket formed entirely of plastic, and the lower side is open and has a substantially box shape by the upper surface plate 21 and the surrounding wall 22. A pair of flanges 23, 23 are integrally projected on a diagonal line. In addition, elastic pieces 24 each having a claw 24a formed at the lower end are integrally projected at a plurality of locations on the surrounding wall 22.

  The top plate 21 has two rectangular windows 25 and 26, a polygonal hole 27, a circular bulge 28, and three rectangular windows. 29, 30, and 31 and the pressing piece 32 formed in the shape of a tongue piece are provided. Among these, each of the opening ends of the windows 25 and 26 is integrally provided with cylindrical portions 25a and 26a protruding in a frame shape on the back side, and the emergency notification button 34 is provided on each cylindrical portion 25a and 26a. Each of the alarm / confirmation indicator lamps 35 is slidably guided.

  In addition, a speaker 36 mounted on a sub-board 44 (to be described later) is attached to the hole 27, and a microphone 37 mounted on the sub-board 44 is attached to a hole 28 a provided in the center of the bulging portion 28. Each window 29, 30, 31 faces a power lamp 38, a video lamp 39, and a line lamp 40 mounted on the sub-board 44.

  As shown in FIG. 2, the pressing piece 32, which is a feature of the present invention, has a base end portion 32 a that is continuous with the upper surface portion 21 so that a portion other than the base end portion 32 a is separated from the upper surface portion 21 by a U-shaped groove 42. It is integrally formed and cantilevered on the upper surface plate 21, and the free end portion 32b is formed on the back surface side so as to be elastically deformable. As shown in FIG. 4, a pressed portion 32c formed in a small-diameter disk shape is integrally projected on the surface of the pressing piece 32 on the free end portion 32b side, and the back surface of the free end portion 32b. At a portion corresponding to the pressed portion 32c, a pressing portion 32d formed in a hemispherical shape is integrally projected. Further, at the tip of the free end portion 32b of the pressing piece 32, a restricting portion 32e that protrudes integrally so as to be inclined toward the back surface side is provided. The restricting portion 32e is elastically deformed by the pressing piece 32, and when the pressing portion 32d presses an actuator 47a of a tact switch 47, which will be described later, the tact switch 47 is turned on, and at the same time, the pressing piece 32 comes into contact with the sub-substrate 44 and elastically presses. Regulate deformation.

  The bracket 20 formed in this way is positioned by engaging the claw portion 24a of the elastic piece 24 into a slit-like hole (not shown) of the control board 17, as shown in FIG. The flanges 23 and 23 are attached to the control board 17 by screws 42 and 42 inserted through holes. In this state, the pressed portion 32 c of the pressing piece 32 faces the small hole 3 a of the upper case 3 as shown in FIG. 4 and faces the small hole 12 of the operation panel 7. Further, an emergency call button 34 and a notification / confirmation indicator lamp 35 face each of the two windows 8 and 9 of the operation panel 7, and a speaker 36 and a microphone 37 include a large number of small holes 10 and small holes 11. The power lamp 38, the video lamp 39, and the line lamp 40 face the three windows 13, 14, and 15, respectively.

  The sub board 44 is attached to the boss 46 of the bracket 20 with a screw 45. In this state, the actuator 47a of the tact switch 47 mounted on the sub board 44 faces the pressing portion 32d of the pressing piece 32. . In this state, the width L of the pressing piece 32 is slightly larger than the width l of the tact switch 47 so that the pressing piece 32 covers the tact switch 47 as shown in FIG.

  Next, the usage method of the emergency call apparatus comprised in this way is demonstrated. When emergency notification is required, a finger is inserted into the window 8 of the operation panel 7 and the emergency notification button 34 is pressed to operate. By operating the emergency notification button 34, an emergency is notified to the police, the security company, or the like connected to the emergency notification device 1 via a line, and the notification / confirmation indicator lamp 35 is turned on.

  When resetting the emergency call device 1 to the initial position, as shown in FIG. 4, the tip of the needle-shaped tool 50 is inserted into the emergency call device 1 from the small hole 12 of the operation panel 7, and the tip of the tool 50 is inserted. By pressing the pressed portion 32c of the pressing piece 32, the free end portion 32b of the pressing piece 32 is elastically deformed. Due to the elastic deformation of the pressing piece 32, the pressing portion 32d presses the actuator 47a of the tact switch 47, so that the tact switch 47 is turned on and the emergency notification device 1 is reset.

  When the pressing piece 32 is elastically deformed by the tool 50 and the tact switch 47 is turned on, the tip of the restricting portion 32e of the pressing piece 32 comes into contact with the sub-substrate 44, so that the elastic deformation of the pressing piece 32 is restricted. 32 and the tact switch 47 can be prevented from being damaged. Further, as shown in FIG. 2, the width L of the pressing piece 32 is slightly larger than the width l of the tact switch 47 so that the pressing piece 32 covers the tact switch 47. The static electricity that has entered the reporting device 1 does not directly shift to the tact switch 47 but moves to the pressing piece 32 through the pressed portion 32c.

  The static electricity transferred to the pressing piece 32 moves by a distance L / 2 in the width direction along the surface of the pressing piece 32, and then moves by a distance L / 2 in the width direction along the back surface of the pressing piece 32. The actuator reaches the actuator 47a of the tact switch 47 through the pressing portion 32d. In this way, the edge surface distance between the small hole 12 of the operation panel 7 and the actuator 47a of the tact switch 47 becomes long, so that the tact switch 47 is destroyed or malfunctions due to static electricity entering from the small hole 12 of the operation panel 7. Can be prevented. Since the pressed piece 32 is formed with a pressed portion 32 c protruding on the front surface and a pressing portion 32 d protruding on the back surface, the edge distance between the small hole 12 of the operation panel 7 and the actuator 47 a of the tact switch 47. Can be longer. Moreover, the number of parts can be reduced by providing the pressing piece 32 integrally with the bracket 20.

  In the present embodiment, an example using a tool whose tip that elastically deforms the pressing piece 32 has a needle shape has been described. However, a ballpoint pen or the like that is used on a daily basis may be used, and in short, it can be inserted into the small hole 12. What is necessary is just to be formed in the thickness of the grade.

It is a perspective view which shows the external appearance of the electronic device which employ | adopted the press structure of the switch which concerns on this invention. It is a front view of the principal part which shows the state which removed the upper case of the electronic device which employ | adopted the press structure of the switch which concerns on this invention. It is a perspective view which shows the external appearance of the bracket used for the press structure of the switch which concerns on this invention. It is the IV-IV sectional view taken on the line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Emergency call apparatus (electronic device), 2 ... Lower case, 3 ... Upper case, 12 ... Small hole, 20 ... Bracket, 32 ... Pressing piece, 32c ... Pressed part, 32d ... Pressing part, 32e ... Control part, 44 ... Sub-board, 47 ... Switch, 47a ... Actuator, 50 ... Tool.

Claims (2)

A housing provided with a hole into which a needle-like body can be inserted; a bracket formed of plastic provided to face the back surface of the housing; and a switch provided on the back side of the bracket. A pressing structure for a switch integrally provided with a pressing piece formed in a tongue-like shape for turning on the switch by elastically deforming the portion facing the hole, and pressing the switch. A switch pressing structure characterized in that a portion is formed in a hemispherical shape integrally with the pressing piece, and the width of the pressing piece is slightly larger than the width of the switch so as to cover the switch.   The switch pressing structure according to claim 1, wherein a board on which the switch is mounted is provided, and a restriction part that regulates an elastic deformation amount of the pressing piece by contact with the board is provided at a free end of the pressing piece. A switch pressing structure characterized by that.

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