JP2013191309A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch hard to produce a trouble caused by exothermic heat if a load exceeding a rating is connected thereto.SOLUTION: The switch includes: contact points (composed of a fixed contact point 12c and a movable contact point 13a) electrically connected to a power supply path between the load and a power source; an open/close mechanism unit 24 for switching the contact points on/off; a light-emitting diode LED1 for operation display which emits when power is supplied to the load; a current transformer CT1, having a primary winding connected in series with the contact points, for making the light-emitting diode LED1 emit light by making a current flow through the light-emitting diode LED1 connected to a secondary winding, when a current flows in the power supply path; and a thermal fuse F1 electrically connected between the current transformer CT1 and the load.

Description

  The present invention relates to a switch having a pilot lamp.

  Conventionally, a switch used for turning on / off power supply to a load is provided with a pilot lamp that is turned on when power is supplied to the load (see, for example, Patent Document 1 and Patent Document 2).

  In the switch described in Patent Document 1, a primary winding of a current transformer is connected in series with a contact, and a pilot lamp and a diode made of a light emitting diode are arranged in parallel with their polarities reversed in the secondary side of the current transformer. It is connected. When the contact is turned on and power is supplied to the load, a current flows on the primary side of the current transformer, so that a current is generated on the secondary side of the current transformer and the pilot lamp is turned on.

  In the switch described in Patent Document 2, four diodes are bridge-connected between the contacts and the load, and another diode is connected in the forward direction between the DC output terminals of the diode bridge. Then, between the AC input terminals of the diode bridge, two light emitting diodes are connected in parallel with their polarities opposite to each other via a current limiting resistor. When the contact is turned on and power is supplied to the load, the light emitting diode is driven by the forward voltage of two diodes generated in the diode bridge in the half cycle in which the power supply voltage is positive and in the half cycle in which the power supply voltage is negative. A current flows through the LED, and the light emitting diode is turned on.

Japanese Patent Laid-Open No. 2002-203455 (see paragraphs [0029] [0031] [0032] and FIGS. 1 and 11) Japanese Unexamined Patent Publication No. 7-182951 (see paragraphs [0011]-[0013] and FIG. 4)

  When a load exceeding the rating is connected to the switches of Patent Documents 1 and 2 described above, current exceeding the rating flows to the primary side of the current transformer and the diode bridge when the contact is turned on, and the current transformer and the diode bridge generate abnormal heat. There was a possibility. When the current transformer or the diode bridge generates heat abnormally, there is a possibility that the switch may malfunction due to the generated heat.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a switch that is less prone to malfunction due to heat generation even when a load exceeding the rating is connected.

  The switch of this invention is provided with the container installed in a construction material, and a load and a power supply are connected through an electric wire. A contact, an opening / closing mechanism, a light emitting unit, a power feeding unit, and a thermal fuse are housed inside the container. The contact is electrically connected to a power supply path between a load and a power source. The opening / closing mechanism switches on / off of the contact. The light emitting unit is for operation display and emits light when power is supplied to the load. The power feeding unit is connected in series with the contact, and when a current flows through the power feeding path, a current flows through the light emitting unit to cause the light emitting unit to emit light. The thermal fuse is electrically connected between the power supply unit and the load.

  In this switch, the container body is attached to the construction material in a state where a rear portion is placed in a hole provided in the construction material. The power supply unit is disposed behind the contact point and the opening / closing mechanism unit inside the container body, and the rear surface of the container body is electrically connected between the series circuit of the load and the power source and the contact point. An electric wire insertion opening into which an electric wire for connecting to the cable is inserted is opened. Moreover, the terminal part electrically connected to the electric wire inserted from the said electric wire insertion port is accommodated in the inside of the said container body ahead of the said electric power feeding part. The thermal fuse is disposed inside the container so as to electrically connect between the terminal part disposed on the front side and the power feeding part disposed on the rear side in the container body. It is also preferable to store along the front-rear direction.

  In this switch, the power feeding unit includes a current transformer. The current transformer includes a ring-shaped core, and a primary winding and a secondary winding wound around the core. The primary winding is connected in the middle of the feeding path, and a circuit including the light emitting unit is connected between both ends of the secondary winding. One end of the thermal fuse is connected to the terminal portion, and the other end of the thermal fuse is inserted into the center hole of the core through the rear side of the core, and the primary winding is formed inside the center hole. It is also preferable to be connected to.

  According to the present invention, when a load exceeding the rating is connected, there is a possibility that a current exceeding the rating flows in the power supply unit, and the power supply unit may abnormally generate heat. When the operating temperature is exceeded, power supply to the load is interrupted by the thermal fuse. Therefore, when the temperature fuse cuts off the power supply to the load, the abnormal heat generation of the power supply unit can be suppressed, and a switch that is less likely to cause a problem due to the abnormal heat generation of the power supply unit can be realized.

It is a disassembled perspective view of the switch main body which comprises the switch of Embodiment 1. FIG. (A) is a front view of a switch body constituting the same, (b) is a right side view of the switch body, and (c) is a bottom view of the switch body. It is a perspective view of the switch main body which comprises the same as the above. (A) (b) is a perspective view which shows the principal part same as the above. It is sectional drawing of the principal part same as the above. It is a disassembled perspective view of the principal part same as the above. It is sectional drawing which looked at the switch main body which comprises the same from the lower side. It is a disassembled perspective view explaining the construction method same as the above. It is a circuit diagram same as the above. 6 is a circuit diagram of a switch according to Embodiment 2. FIG. It is a perspective view of the principal part same as the above. It is a disassembled perspective view of the principal part same as the above.

(Embodiment 1)
The switch of Embodiment 1 is demonstrated based on FIGS. In the following description, unless otherwise specified, the vertical and horizontal directions are defined in the direction shown in FIG. 2A, and the left side in FIG. 2B is described as the front side and the right side as the rear side.

  As shown in FIG. 8, the switch is attached to the switch body 1 whose contact is switched on / off each time the push button 27 on the front surface is pressed, and the front surface of the switch body 1, and the operator pushes the front surface. And a handle 2 for pushing the push button 27 on the back side.

  The body 3 of the switch body 1 is held by a mounting frame 50 for an embedded wiring device. A plate (consisting of a plate frame 60 and a decorative plate 70) is attached to the front side of the mounting frame 50 so as to surround the switch body 1, and the handle 2 is disposed in the opening windows 61 and 71 of the plate. . Long holes 53 are provided in the upper and lower frame pieces of the mounting frame 50, and screws (not shown) inserted through the long holes 53 are fastened to screw holes of an embedded box embedded in the construction surface. Thus, the mounting frame 50 is fixed to the construction surface. Further, the upper and lower frame pieces of the mounting frame 50 are provided with holes 54 for locking one end portions of clip metal fittings (not shown). By sandwiching such a panel material, the attachment frame 50 can be fixed to the panel material constituting the construction surface. Further, the upper and lower frame pieces of the attachment frame 50 are provided with screw holes 55 to which the attachment screws 62 for attaching the plate frame 60 are fastened.

  FIG. 9 is a circuit diagram showing an internal circuit of the switch. The switch includes connection terminals T1 and T2 to which a series circuit of an AC power supply AC and a load W1 (for example, a lighting fixture or a ventilation fan) is connected. Between the connection terminal T1 and the connection terminal T2, the contact S1, the primary winding n1 of the current transformer CT1, and the thermal fuse F1 are connected in series. Further, a series circuit of a current limiting resistor R1 and a neon lamp L1 is connected in parallel between the connection terminal T1 and the connection terminal T2. A series circuit of a capacitor C1 and a resistor R2 is connected between both ends of the secondary winding n2 of the current transformer CT1. A light-emitting diode LED1 and a diode D1 are connected in parallel to the capacitor C1 with their polarities reversed. Here, when a current flows through the power supply path from the current transformer CT1 or the like in series with the contact S1, a power supply unit is configured to cause the light-emitting diode LED1 to emit light by flowing a current through the light-emitting diode LED1.

  If the contact S1 is switched off while the AC power supply AC and the load W1 are connected between the connection terminals T1 and T2, a voltage is applied across the contact S1, and thus neon via the resistor R1. A current flows through the lamp L1, and the neon lamp L1 is turned on. At this time, the current flowing through the neon lamp L1 is set to a current value sufficiently smaller than the current required to operate the load W1.

  On the other hand, when the contact S1 is switched on, a current flows through the primary winding n1 of the current transformer CT1, whereby a current is supplied to the light emitting diode LED1 connected to the secondary winding n2 every half cycle of the AC power supply AC. Flows, and the light emitting diode LED1 emits red light.

  Therefore, when an illumination load is used as the load W1, the position display is performed by turning on the neon lamp L1 when the contact S1 is turned off, that is, when the illumination load is extinguished, and the switch position can be easily confirmed even in the dark. . On the other hand, when the contact S1 is turned on, that is, when the load W1 is in operation, the light emitting diode LED1 is turned on to indicate that the load W1 is in operation.

  Next, the switch body 1 will be described with reference to FIGS. 1 to 3, 7, and 8. The body 3 of the switch body 1 has a rectangular parallelepiped shape, and is configured by combining a synthetic resin body 4 having an open front surface and a synthetic resin cover 5 having an open rear surface. That is, two assembly pieces 6 protrude rearward from the rear edges of the upper and lower side walls of the cover 5, and the protrusions 7 of the body 4 are locked in the holes 6 a of the assembly pieces 6. And the cover 5 are combined.

  The dimensions of the container 3 in the short direction (vertical direction) are such that up to three can be attached to the mounting frame 50 (see FIG. 8) for the embedded wiring device. The mounting frame 50 has an instrument mounting hole 51 in the center, and the body 3 is mounted on the mounting frame 50 with the front surface exposed forward from the hole 51. Up to three vessel bodies 3 can be attached to the attachment frame 50, and the transverse dimension of the vessel body 3 is set to about one third of the longitudinal dimension of the hole 51. The dimension in the (left-right direction) is set to be substantially the same as the dimension in the short direction of the hole 51. Such a dimension of the container 3 is referred to as one module dimension.

  In addition, two attachment claws 8 are provided on each of the left and right side walls of the cover 5 constituting the front portion of the container body 3, and the attachment claws 8 are locked in the instrument attachment holes 52 of the attachment frame 50. The container 3 is held by the mounting frame 50. Two grooves 9 extending in the front-rear direction and opened at the rear end are formed in parallel on the right side wall of the cover 5, and the bending piece 10 between the two grooves 9 can be freely bent in the left-right direction. Thus, the above-described two mounting claws 8 are provided on the bending piece 10. Therefore, when the bending piece 10 is bent inside the cover 5, the mounting claw 8 provided on the bending piece 10 comes out of the instrument mounting hole 52 of the mounting frame 50, and the mounting claw 8 and the instrument mounting hole 52. Since the locked state is released, the container body 3 is removed from the mounting frame 50. Note that a protrusion 10 a is provided at the rear end portion of the bending piece 10 in order to facilitate the pushing of the bending piece 10.

  The inside of the body 4 constituting the rear part of the vessel body 3 is roughly divided into three storage chambers in the left-right direction. The right and left storage chambers 4a and 4b store quick-connecting terminal portions constituting the connection terminals T1 and T2, respectively. The left and right central storage chamber 4c has a contact S1 and an opening / closing mechanism portion 24 to be described later. Is stored.

  In the right storage chamber 4a, a terminal portion including a terminal plate 11, two lock springs 14, and a release button 15 is stored. The terminal plate 11 includes two contact pieces 11a for holding the electric wire between the terminal plate 11 and the lock spring 14 and a connection piece 11b to which one terminal of the thermal fuse F1 is connected. In addition, two electric wire insertion openings 16a are opened in portions corresponding to the gaps between the contact piece 11a and the lock spring 14 on the rear wall of the body 4 corresponding to the storage chamber 4a. A tool insertion hole (not shown) is opened at the corresponding site.

  In the left storage chamber 4b, a terminal portion including a terminal plate 12, one lock spring 14 and a release button 15 is stored. The terminal plate 12 is integrally provided with a contact piece 12a for holding the electric wire between the terminal plate 12 and an extension piece 12b disposed in the central storage chamber 4c. A fixed contact 12c is provided on the extension piece 12b. It is fixed. In addition, on the rear wall of the body 4 corresponding to the storage chamber 4b, an electric wire insertion port 16b is opened at a portion corresponding to the gap between the contact piece 12a and the lock spring 14, and at a portion corresponding to the release button 15. A tool insertion hole (not shown) is opened. A movable contact plate 13 is accommodated in the storage chamber 4c, and the movable contact 13a and the fixed contact 12c fixed to the movable contact plate 13 constitute a contact S1.

  Here, the electric wire inserted from the electric wire insertion port 16a is inserted between the locking spring 14 and the contact piece 11a, and the locking spring 14 bites into the electric wire to prevent the electric wire from being pulled out. The terminal board 11 is electrically connected. Similarly, the electric wire inserted from the electric wire insertion port 16b is inserted between the locking spring 14 and the contact piece 12a, and the locking spring 14 bites into the electric wire to prevent the electric wire from being pulled out. The terminal board 12 is electrically connected. Further, when a tool is inserted from a tool insertion hole opened in the rear wall of the body 4 and the release button 15 is pressed, the lock spring 14 is bent in a direction away from the contact piece 11a or 12a by the release button 15. Since the retaining of the electric wire is released, the electric wire can be easily removed. Note that the quick-connection type terminal portion constituted by the lock spring 14, the release button 15, and the terminal plates 11 and 12 is well known in the art. For example, the lock spring and the release described in JP-A-2002-203455 are known. Since it has the same configuration as the button, a detailed description is omitted.

  Next, the middle frame block 17 stored in the central storage chamber 4c will be described with reference to FIGS. 1 and 4 to 7. The middle frame block 17 includes a front frame 18 and a rear frame 19 each made of a synthetic resin molded product, a current transformer CT1, and a terminal plate 20.

  A current transformer CT1 is disposed on the rear side of the front frame 18, and a rear frame 19 is attached so as to cover the current transformer CT1. The current transformer CT1 includes a ring-shaped core 21, and a primary winding n1 and a secondary winding n2 wound around the core 21, respectively. One end of the primary winding n1 is electrically connected to the terminal plate 20, and the other end of the primary winding n1 is connected to the terminal 35b of the thermal fuse F1 inside the center hole 21a of the core 21.

  The front frame 18 includes a recess 18a that houses the contact S1, and the terminal plate 20 is placed on the bottom of the recess 18a. A V-groove 18b is formed on the side wall of the recess 18a, and the movable contact plate 13 is inserted into the recess 18a with the protrusion 13b of the movable contact plate 13 inserted into the V-groove 18b. The movable contact plate 13 is rotatably arranged with a contact portion (rear end edge) with the terminal plate 20 as a fulcrum in a state where the rear end edge is in contact with the terminal plate 20, and the protrusion 13b has a V groove 18b. The rotation range is regulated by abutting on the end face. Here, when the movable contact plate 13 rotates counterclockwise in FIG. 7, the movable contact 13a comes into contact with the fixed contact 12c, and the contact S1 is turned on (closed). On the other hand, when the movable contact plate 13 rotates clockwise in FIG. 7, the movable contact 13a is separated from the fixed contact 12c, and the contact S1 is turned off (opened).

  The front frame 18 is provided with insulating walls 18c that insulate the thermal fuse F1 and the lock spring 14 from each other, and the terminal of the thermal fuse F1 is provided from the groove 18d of the connecting portion that connects the front ends of the insulating wall 18c. 35a protrudes forward. The terminal 35a of the thermal fuse F1 is connected to the connection piece 11b of the terminal plate 11, and the primary winding of the contact S1 and the current transformer CT1 is provided between the terminal plates 11 and 12 (that is, the connection terminals T1 and T2). A series circuit of n1 and thermal fuse F1 is connected.

  The rear frame 19 includes a rear wall 19a that is disposed opposite to the rear surface of the current transformer CT1, a side wall 19b that protrudes forward from the peripheral portion of the rear wall 19a and partially covers the side surface of the current transformer CT1, and a rear wall 19a. A columnar portion 19c protruding forward from the left side portion is integrally provided. A terminal plate 20 electrically connected to both ends of the secondary winding n2 of the current transformer CT1 is insert-molded in the columnar portion 19c, and the tip ends of the two terminal plates 20 from the front end surface of the columnar portion 19c. Is exposed.

  The terminal board 20 is electrically connected to the display block 22 housed in the cover 5. The display block 22 has a base 22a made of synthetic resin, and a terminal board (not shown) is insert-molded on the base 22a. Further, resistors R1 and R2, a capacitor C1, a light emitting diode LED1, a diode D1, and a neon lamp L1 in the circuit shown in FIG. 9 are mounted on the base 22a, and elastically contact with the front pieces of the terminal plates 11 and 12, respectively. Contacts 22b and 22c are provided. As shown in FIG. 7, in the state where the display block 22 is housed inside the container 3, the contacts 22b and 22c are in elastic contact with the front side pieces of the terminal plates 11 and 12, respectively, and the resistor R1 is connected between the connection terminals T1 and T2. And a neon lamp L1 are connected in series. A series circuit of a resistor R2 and a capacitor C1 mounted on the base 22a is connected between both ends of the secondary winding n2, and a light emitting diode LED1 and a diode D1 are connected in parallel with the capacitor C1, respectively. Thereby, in the state where the series circuit of the load W1 and the AC power supply AC is connected to the terminal plates 11 and 12 constituting the connection terminals T1 and T2, respectively, the neon lamp L1 is lit when the contact S1 is turned off, and the contact S1 is turned on. Sometimes the light emitting diode LED1 is lit.

  In addition, a translucent window 23a is provided on the front wall of the cover 5 at a portion corresponding to the neon lamp L1 and the light emitting diode LED1 included in the display block 22, and the translucent window 23a has a translucent lamp cover. 23 is attached. Therefore, the ON / OFF state of the neon lamp L1 and the light emitting diode LED1 can be visually recognized through the lamp cover 23 from the outside.

  In addition, an opening / closing mechanism 24 for opening and closing the contact S1 is housed inside the container body 3. The opening / closing mechanism 24 includes a reversing spring 25, a reversing element 26, a push button 27, a slide cam 28, and a return spring 29. The reversing spring 25 is a coil spring, and a protrusion 13 c provided at the front edge of the movable contact plate 13 is inserted into the rear end portion of the reversing spring 25, and the front end portion of the reversing spring 15 is provided at the rear portion of the reversing element 26. Is inserted into the cylindrical portion 26a. The front end portion of the inverter 26 is exposed forward from a through hole 31 provided in the bottom wall of the recess 30 provided in the front surface of the cover 5. Triangular fulcrum protrusions 26b that taper toward the front side are provided on both upper and lower side surfaces of the intermediate portion of the inverter 26. Bearing grooves 32 are formed on both side edges of the through hole 31, and the fulcrum protrusion 26 b is inserted into the bearing groove 32 from the rear side, so that the reversal element 26 contacts the fulcrum protrusion 26 b and the bearing groove 32. It is swingable with the part as a fulcrum. Here, one end side of the reversing spring 25 is held by the movable contact plate 13, and the other end side of the reversing spring 25 is held by the reversing element 26. When the reversing element 26 swings, it is reversed in the middle of the swinging range. The spring 25 passes through the most compressed position. Before and after this position, the direction of the spring force acting on the movable contact plate 13 from the reversing spring 25 is reversed, and the movable contact plate 13 is rapidly rotated to the opposite side by the spring force of the reversing spring 25.

  By the way, on both the left and right sides of the portion exposed forward from the through hole 31 in the inverter 26, protrusions 26c that protrude forward and come into contact with the slide cam 28 are provided. The slide cam 28 is configured to slide along the back surface of the push button 27 according to the positional relationship of the reversal element 26 when the push button 27 disposed in the recess 30 of the cover 5 is pressed. The configuration of the slide cam 28 will be described later.

  The push button 27 includes guide protrusions 27a projecting from the rear end portions of both outer side surfaces in the longitudinal direction, and the guide protrusions 27a are inserted into guide grooves 33 formed along the front-rear direction on the inner side surface of the recess 30. It is movable in the front-rear direction and is prevented from coming forward.

  A protrusion (not shown) is provided on the rear surface of the push button 27, and the return spring 29 is attached to the rear surface of the push button 27 by inserting the protrusion of the push button 27 into the hole 29a of the return spring 29 made of a leaf spring. The return spring 29 includes two spring pieces 29b that expand to the left and right toward the rear side, and the push button 27 has a spring force of the return spring 29 by elastically contacting the tip of each spring piece 29b with the bottom surface of the recess 30. And is always pushed forward.

  The slide cam 28 is formed in a rectangular frame shape from a synthetic resin, and a cam body 28a that abuts against the protrusion 26c of the inverter 26 is integrally provided on the rear surface of the side portion that faces in the left-right direction. In addition, a pair of spring pieces 28b is held at the center of the other side portion of the slide cam 28, and the protrusion on the back surface of the push button 27 is inserted between the pair of spring pieces 28b. A slide cam 28 is slidably mounted on the back surface of the lens. A return force for returning the slide cam 28 to the initial position is given by the elastic force of the spring piece 28b.

  Further, a pair of shaft portions 34 that project obliquely forward and support the handle 2 rotatably are integrally provided on one end side (left side) of the front surface of the cover 5. The front end portion of the shaft portion 34 is formed in a columnar shape having a direction parallel to the short side direction of the cover 5 as a central axis direction. A bearing portion (not shown) is provided at one end of the back surface of the handle 2, and the handle 2 is rotatably supported around the shaft portion 34 by fitting the shaft portion 34 into the bearing portion. A window hole 2a is provided on the front surface of the handle 2 at a portion facing the lamp cover 23, and a part of the lens 2b is fitted into the window hole 2a from the back side of the handle 2. Thus, the light emitted from the neon lamp L1 and the light emitting diode LED1 enters the lens 23 through the lamp cover 23, passes through the lens 23, and is guided to the front side of the handle 2.

  When the handle 2 is attached to the switch body 1 as described above and the other end (right side) of the handle 2 is pushed, the handle 2 moves to the right in FIG. Rotate around. A push button 27 held by the switch body 1 is in contact with the rear surface of the handle 2. When the handle 2 is pushed, the push button 27 is pushed into the body 3.

  Here, the operation of the switch body 1 will be briefly described. Although the movable contact plate 13 is neutral in FIG. 7, the movable contact plate 13 is actually rotated to the left end of the rotation range by the spring force of the reversing spring 25, or the contact S1 is closed or rotated. Rotating to the right end of the range and stopping in any state where the contact S1 is open.

  In a state where the contact S1 is open (off), that is, in a state where the movable contact 13a is separated from the fixed contact 12c, the movable contact plate 13 is rotated to the right end of the rotation range, and the inverter 26 is shown in FIG. It has fallen to the left side. At this time, the slide cam 28 is returned to the center position of the moving range by the spring piece 28b. Further, the reversing element 26 is held at a position where the reversing element 26 is tilted to the left side by the spring force of the reversing spring 25. In a state in which the inverter 26 is tilted to the left side, the right protrusion 26c is positioned on the front side (upward in FIG. 7) rather than the left protrusion 26c of the inverter 26.

  When the user presses the right side of the handle 2 from the off state, the push button 27 is pushed behind the handle 2 in accordance with the rotation of the handle 2, and the slide cam 28 moves together with the push button 27 to the lower side in FIG. At this time, the cam body 28a on the right side of the slide cam 28 contacts the right projection 26c of the inverter 26 and pushes the right end of the inverter 26 downward, so that the inverter 26 pushes the front end of the fulcrum projection 26b. It rotates clockwise in the figure as the center. When the reversing spring 25 is compressed according to the rotation of the reversing element 26 and the reversing element 26 passes through the position where the reversing spring 25 is most compressed, the spring force of the reversing spring 25 is released, and the reversing element 26 is moved to the right in the figure. Rotates rapidly around. When the inverter 26 rotates clockwise, the movable contact plate 13 rotates counterclockwise with the trailing edge as a fulcrum according to the rotation of the inverter 26, and stops at a position where the movable contact 13a contacts the fixed contact 12c. At this time, the reversing element 26 is held at a position where the reversing spring 25 falls to the right side by the spring force of the reversing spring 25, and the movable contact plate 13 is held at a position where the movable contact 13a contacts the fixed contact 12c. Thereafter, when the user releases the handle 2, the push button 27 is pushed back by the spring force of the return spring 29, and the handle 2 in contact with the push button 27 also returns to the original position. At the same time, the slide cam 28 is slid under the spring force of the spring piece 28b and returns to the center position. When the inverter 26 is tilted to the right side, the left protrusion 26c is located on the front side (upward in FIG. 7) rather than the right protrusion 26c of the inverter 26.

  When the user presses the right side of the handle 2 from the on state, the push button 27 is pushed on the back side of the handle 2 according to the rotation of the handle 2, and the slide cam 28 moves together with the push button 27 to the lower side in FIG. . At this time, the cam body 28a on the left side of the slide cam 28 in the drawing contacts the left projection 26c of the inverter 26 and pushes the left end of the inverter 26 downward, so that the inverter 26 pushes the front end of the fulcrum projection 26b. It rotates counterclockwise in the figure as the center. When the reversing spring 25 is compressed according to the rotation of the reversing element 26 and the reversing element 26 passes through the position where the reversing spring 25 is compressed most, the spring force of the reversing spring 25 is released, and the reversing element 26 is left in the figure. Rotates rapidly around. When the inverter 26 rotates counterclockwise, the movable contact plate 13 rotates clockwise with the trailing edge as a fulcrum according to the rotation of the inverter 26 and stops at the right end position of the rotation range. Then, the movable contact 13a is separated from the fixed contact 12c. At this time, the reversing element 26 is held at a position where the reversing spring 25 is tilted to the left by the spring force of the reversing spring 25, and the movable contact plate 13 is held at a position where the movable contact 13a is separated from the fixed contact 12c. Thereafter, when the user releases the handle 2, the push button 27 is pushed back by the spring force of the return spring 29, and the handle 2 in contact with the push button 27 also returns to the original position. At the same time, the slide cam 28 is slid under the spring force of the spring piece 28b and returns to the center position. When the inverter 26 is tilted to the left side, the right protrusion 26c is positioned on the front side (upward in FIG. 7) rather than the left protrusion 26c of the inverter 26. Thus, each time the handle 2 is pushed, the opening / closing mechanism 24 switches on / off of the contact S1.

  As described above, the switch of the present embodiment includes the container 3 installed on the construction material, and the load W1 and the power source are connected via the electric wire. The container 3 houses a contact S1, an opening / closing mechanism 24, a light emitting unit (consisting of a light emitting diode LED1), a power feeding unit (consisting of a current transformer CT1, etc.), and a thermal fuse F1. The contact S1 is electrically connected to a power supply path between the load and the power source. The opening / closing mechanism 24 switches the contact S1 on / off. The light emitting unit is for operation display and emits light when power is supplied to the load. The power feeding unit is connected in series with the contact S1, and when a current flows through the power feeding path, a current flows through the light emitting unit to cause the light emitting unit to emit light. The thermal fuse F1 is electrically connected between the power supply unit and the load.

  As a result, when a load exceeding the rating is connected, current exceeding the rating may flow in the power supply unit, and the power supply unit may generate heat abnormally. However, the temperature rise due to the heat generation of the power supply unit causes the operation of the thermal fuse F1. When the temperature is exceeded, the thermal fuse F1 is turned off and power supply to the load is cut off. Therefore, the thermal fuse F1 cuts off the power supply to the load, so that it is possible to realize a switch that suppresses abnormal heat generation in the power supply unit and is less prone to malfunction due to abnormal heat generation in the power supply unit.

  Moreover, the container body 3 is attached to the construction material in a state where the rear portion is placed in a hole provided in the construction material. Inside the container 3, a power feeding unit (consisting of a current transformer CT <b> 1) is disposed behind the contact S <b> 1 and the switching mechanism unit 24. In addition, on the rear surface of the vessel body 3, there are opened wire insertion ports 16a and 16b into which wires for electrically connecting the series circuit of the load and the power source and the contact S1 are inserted. Inside the container 3, a terminal portion (consisting of the terminal plate 11 and the lock spring 14) that is electrically connected to the electric wire inserted from the electric wire insertion port 16 a is housed in front of the power feeding portion. And as shown in FIG.4 and FIG.5, the thermal fuse F1 electrically connects between the terminal part arrange | positioned inside the container 3 at the front side, and the electric power feeding part arrange | positioned at the back side. The container 3 is stored along the front-rear direction.

  Thereby, the thermal fuse F1 can be accommodated by effectively using the internal space of the container 3, and compared with the case where the thermal fuse F1 is accommodated with the longitudinal direction of the thermal fuse F1 orthogonal to the front-rear direction. Thus, the body 3 can be made small.

  In the present embodiment, the power feeding unit includes the current transformer CT1. The current transformer CT1 includes a ring-shaped core 21, and a primary winding n1 and a secondary winding n2 wound around the core 21, respectively. The primary winding n1 is connected in the middle of the feeding path, and a circuit including a light emitting unit is connected between both ends of the secondary winding n2. One terminal 35a of the thermal fuse F1 is connected to the terminal plate 11 constituting the terminal portion. As shown in FIG. 5, the other terminal 35b of the thermal fuse F1 passes through the rear side of the core 21, is inserted into the center hole 21a of the core 21, and is connected to the primary winding n1 inside the center hole 21a. .

  Thereby, the connection part of the terminal 35b of the thermal fuse F1 and the primary winding n1 can be kept away from the temperature sensing part of the thermal fuse F1 as much as possible. Therefore, when the terminal 35b and the primary winding n1 are solder-connected, the heat of the solder is less likely to be applied to the temperature sensitive portion of the thermal fuse F1, and the thermal fuse F1 is less likely to malfunction due to the heat of the solder.

  The connection method between the terminal 35b and the primary winding n1 is not limited to solder connection, and the terminal 35b and the primary winding n1 may be connected by a method such as caulking.

(Embodiment 2)
The switch of Embodiment 2 is demonstrated based on FIGS. In the first embodiment, the power feeding unit is configured by the current transformer CT1, but in this embodiment, the power feeding unit is configured by the diode bridge DB1 as illustrated in FIG. In addition, since it is the same as that of Embodiment 1 except the structure of an electric power feeding part, the same code | symbol is attached | subjected to a common component and the description is abbreviate | omitted.

  In the present embodiment, the contact S1, the diode bridge DB1, and the thermal fuse F1 are connected in series between the connection terminal T1 and the connection terminal T2. The diode bridge DB1 includes four diodes D2 to D5 that are bridge-connected, and the DC output terminals of the diode bridge DB1 are short-circuited. That is, a connection point between the diodes D2 and D3 where the cathodes are connected to each other and a connection point between the diodes D4 and D5 where the anodes are connected are short-circuited. A capacitor C2, a light emitting diode LED1, and a resistor R2 are connected in parallel with the diode bridge DB1, and a diode D1 and a capacitor C1 are connected in parallel with the light emitting diode LED1, respectively. A resistor R3 is connected in parallel with the diode bridge DB1.

  Here, when the contact S1 is switched off in a state where the AC power supply AC and the load W1 are connected between the connection terminals T1 and T2, a voltage is applied across the contact S1, so that the voltage is applied via the resistor R1. A current flows through the neon lamp L1, and the neon lamp L1 lights up. At this time, the current flowing through the neon lamp L1 is set to a current value sufficiently smaller than the current required to operate the load W1.

  Further, when the contact S1 is switched on, a forward voltage corresponding to two diodes generated in the diode bridge causes a current to flow through the light emitting diode LED1 every half cycle of the AC power supply AC, and the light emitting diode LED1 emits red light. To do.

  Therefore, when an illumination load is used as the load W1, the position display is performed by turning on the neon lamp L1 when the contact S1 is turned off, that is, when the illumination load is extinguished, and the switch position can be easily confirmed even in the dark. . On the other hand, when the contact S1 is turned on, that is, when the load W1 is in operation, the light emitting diode LED1 is turned on to indicate that the load W1 is in operation.

  Next, the middle frame block 17 that holds the diode bridge DB1 and the thermal fuse F1 that are power supply units will be described. 11 is a perspective view of the middle frame block 17, and FIG. 12 is an exploded perspective view of the middle frame block 17. The middle frame block 17 includes a front frame 18 and a mounting base 36 each made of a synthetic resin molded product, and a terminal plate 20. Etc. Since the front frame 18 is the same as that described in the first embodiment, the description thereof is omitted.

  The mounting base 36 is made of a synthetic resin molded product, and a terminal plate 38a to which the terminal 35b of the thermal fuse F1 is connected and a terminal plate 38b to which the terminal plate 20 is connected are insert-molded on the mounting base 36. The diode bridge DB1 is fixed to the mounting base 36 by electrically connecting the AC input terminal of the diode bridge DB1 to the terminal plates 38a and 36b. Further, the pair of terminal plates 20 electrically connected to the AC input terminal of the diode bridge DB1 protrudes forward, the pair of terminal plates 20 is insert-molded in the columnar portion 37, and the tip of the terminal plate 20 is columnar. The part 37 is exposed to the outside from the front end face.

  The mounting base 36 is disposed on the rear side of the front frame 18, and the terminal plate 20 connected to the terminal plate 38b is disposed on the bottom of the recess 18a. One terminal 35a of the thermal fuse F1 is connected to the terminal plate 11, and the other terminal 35b is connected to the terminal plate 38a.

  Thus, also in the present embodiment, the thermal fuse F1 is disposed in the vicinity of the diode bridge DB1 that is a power feeding unit.

  As a result, when a load exceeding the rating is connected to the switch, a current exceeding the rating may flow through the power supply unit, and thus the power supply unit may generate heat abnormally. When the operating temperature is exceeded, the thermal fuse F1 is turned off and the power supply to the load is cut off. Therefore, the thermal fuse F1 cuts off the power supply to the load, so that it is possible to realize a switch that suppresses abnormal heat generation in the power supply unit and is less prone to malfunction due to abnormal heat generation in the power supply unit.

3 Body 4 Body 5 Cover 11, 12 Terminal board (terminal part)
12c Fixed contact (contact)
13a Movable contact (contact)
14 Locking spring (terminal part)
16a, 16b Electric wire insertion port 21 Core 24 Opening / closing mechanism part CT1 Current transformer (feeding part)
DB1 Diode bridge (feeding unit)
F1 Thermal fuse LED1 Light emitting diode (light emitting part)
n1 Primary winding n2 Secondary winding W1 Load

Claims (3)

A switch comprising a container installed in a construction material, and a load and a power source connected via electric wires,
A contact point electrically connected to a power supply path between the load and the power source;
An opening / closing mechanism for switching the contact on / off;
A light emitting unit for operation display that emits light when power is supplied to the load;
A power feeding unit that is connected in series with the contact point and causes a current to flow through the light emitting unit when the current flows through the power feeding path, and causes the light emitting unit to emit light,
A switch characterized in that a thermal fuse electrically connected between the power supply unit and the load is housed in the container. The vessel is attached to the construction material in a state where the rear portion is placed in a hole provided in the construction material,
Inside the container, the power feeding part is arranged on the rear side of the contact point and the opening / closing mechanism part,
On the rear surface of the vessel body, an electric wire insertion port into which an electric wire for electrically connecting the load and the series circuit of the power source and the contact point is opened,
Inside the vessel body, a terminal portion that is electrically connected to the electric wire inserted from the electric wire insertion port is housed on the front side of the feeding portion,
The thermal fuse is arranged in the front-rear direction inside the container so as to electrically connect between the terminal part disposed on the front side in the container and the power feeding part disposed on the rear side. The switch according to claim 1, wherein the switch is housed along the switch. The power supply unit includes a current transformer,
The current transformer includes a ring-shaped core, and a primary winding and a secondary winding wound around the core,
The primary winding is connected in the middle of the feeding path, and a circuit including the light emitting unit is connected between both ends of the secondary winding,
One end of the thermal fuse is connected to the terminal portion, and the other end of the thermal fuse is inserted into the center hole of the core through the rear side of the core, and is connected to the primary winding inside the center hole. The switch according to claim 2, wherein the switch is provided.

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