JP5069718B2 - Electrical equipment - Google Patents

Description

  The present invention relates to an electric device provided with a cover.

  Conventionally, there is an electrical device such as a waterproof outlet described in Patent Document 1 in which a cover is attached to the case to prevent water from entering the case.

  The case of the above conventional example has an opening on the lower surface and is exposed in a state where the rear surface is in contact with the outer wall. In addition, a fitting groove is provided in the vertical direction on both the left and right side surfaces of the case, and at the lower end portion of the front surface, there is a bent portion that is formed so as to be bent in the horizontal direction by a pair of notches extending upward from the lower end portion. Is provided. The cover is an opening on the lower surface, covers the upper surface, front surface, and both left and right side surfaces of the case, and a fitting piece projects from the surface facing the fitting groove of the case and hooks on the surface facing the bending portion Claws are protruding. In addition, an outlet with the plug blade insertion opening exposed from the opening on the lower surface of the case is accommodated inside the case, and the outlet is electrically connected to an electric wire drawn from the construction surface.

  The cover is locked to the case so as to be slidable in the vertical direction by inserting the fitting piece into the fitting groove of the case. When the cover is slid downward from here, the bent portion on the front surface of the case is pushed into the hooking claw of the cover and displaced rearward in the horizontal direction (inner direction of the case). When the cover is slid further downward and the latching claw reaches below the lower end of the bent portion, the bent portion pushed backward is returned to the front. At this time, the cover is fixed to the case by the hooking hook being hooked on the lower end of the bending portion.

  To remove the cover, first, a jig with a sharp tip such as a flat-blade screwdriver is inserted into the gap between the cover and the bent portion from below. Next, using the jig handle as the force point, the contact point between the tip of the jig and the cover as a fulcrum, and the contact point between the lower end of the bent part and the jig as the working point, the jig is pushed backward in the horizontal direction, and the bent part is moved backward. Bend and remove the latching claw from the flexure. Then, the cover can be removed by sliding the cover upward and removing the fitting piece from the fitting groove.

JP 2007-103258 A

  However, in the electrical equipment as described above, when removing the cover, if the jig inserted in the gap between the cover and the bent portion is pushed backward in the horizontal direction, the bent portion bends backward and at the same time, the tip of the jig. The front wall of the cover that comes into contact with is pushed forward by the jig. For this reason, distortion occurs in the front wall of the cover, and the cover shrinks in the left-right direction. As a result, the left and right side surfaces of the case and the cover covering surface are in close contact with each other, making it difficult to remove the cover.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrical device in which a cover can be easily removed.

In order to achieve the above object, the invention of claim 1 includes a device main body having a predetermined function, a substantially box-shaped case for housing the device main body, a cover formed of a waterproof material, A locking means for detachably attaching the cover to the case; a fixing means for fixing the cover to the case; and a releasing means for releasing the fixing of the cover by the fixing means. A latching claw protruding from a cover and a latched portion provided on the case for latching the latching claw, wherein the release means is provided integrally with the latched portion. And an opening for inserting a jig between the bent portion and the cover. The bent portion is formed between the bent portion and the cover. The jig is inserted from the opening. Inclined portion which gradually reduces the distance between the deflection unit along which is formed on the surface facing the bending portion of the cover, the engaging claw is gradually lowered its projection height with distance from the inclined portion It is characterized by becoming .

According to the first aspect of the present invention, the cover is less likely to be distorted by providing the lower end portion of the cover front wall with an inclined portion that is thicker than the front wall and increases in thickness as it goes downward. Since the interval between the portions is gradually narrowed along the insertion direction of the jig, the bending portion is bent only by pushing the jig in the insertion direction. Thereby, a cover can be removed more easily than before . In addition, the protrusion height of the hooking claw is the highest in the vicinity of the jig insertion part, and is lowered as it moves away from the insertion part. The cover can be easily removed and the cover can be easily removed .

  According to a second aspect of the present invention, in the first aspect of the present invention, the locking means includes a fitting groove provided in the case and a fitting piece provided in the cover and slidingly fitted to the fitting groove. It is characterized by becoming.

  According to the invention of claim 2, the cover can be easily attached to the case by sliding the fitting piece into the fitting groove.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the device main body is a heat ray sensor that detects a heat ray emitted from a human body, and is turned on / off according to the presence or absence of a person based on the output of the heat ray sensor. A signal processing unit for outputting a signal is provided.

According to the third aspect of the present invention, it is possible to provide a heat ray-sensitive automatic switch provided with a cover and a case that have the same effects as the first or second aspect of the present invention.

  The present invention can provide an electrical device in which a cover can be easily removed.

(A) is sectional drawing of the cover 10 and front case 20 of the automatic switch TS with a heat ray sensor which concerns on Embodiment 1, (b) inserted the jig | tool J in the clearance gap B between the bending part 26 and the inclination part 15. FIG. It is an enlarged view of the inclination part 15 periphery at the time. 1 is a system configuration diagram of a remote monitoring control system that uses an automatic switch TS with a heat ray sensor according to Embodiment 1. FIG. (A)-(c) is explanatory drawing of the transmission signal of the remote monitoring control system using the automatic switch TS with a heat ray sensor which concerns on Embodiment 1. FIG. It is a block diagram of automatic switch TS with a heat ray sensor concerning Embodiment 1. FIG. (A)-(d) is a time chart explaining operation | movement of the remote monitoring control system using the automatic switch TS with a heat ray sensor which concerns on Embodiment 1. FIG. It is a disassembled perspective view of automatic switch TS with a heat ray sensor concerning Embodiment 1. FIG. It is a disassembled perspective view of the apparatus main body 2 of the automatic switch TS with a heat ray sensor which concerns on Embodiment 1. FIG. It is a back perspective view of cover 10 of automatic switch TS with a heat ray sensor concerning Embodiment 1. FIG. It is a bottom view of automatic switch TS with a heat ray sensor concerning Embodiment 1. FIG. (A) is the schematic which looked at the automatic switch TS with a heat ray sensor which concerns on Embodiment 2 from the downward direction, (b) is the cover 10 which concerns on Embodiment 2 provided with the latching claw 14 of the structure different from (a). FIG.

(Embodiment 1)
Hereinafter, an embodiment in which the present invention is applied to an automatic switch with a heat ray sensor used in a remote monitoring control system will be described.

  FIG. 2 is a system configuration diagram of the entire system. The main unit TS of the automatic switch with a hot-wire sensor, the sensor ON / OFF switch SW, and the relay control terminal RT, each of which has individual address data set, are arranged in two lines. In addition to being connected to the signal line Ls, the transmission unit CU is connected to the signal line Ls. Although not shown in FIG. 2, a plurality of relay control terminals RT are connected to the signal line Ls, and the plurality of lighting fixtures L are controlled by the automatic switch TS with a heat ray sensor. .

  The transmission unit CU accesses each terminal individually by sending a transmission signal including address data to the signal line Ls by the time division multiplex transmission method, and any one of the signal reply periods set in synchronization with the transmission signal. When monitoring data is received from the terminal device, control data is created based on the monitoring data, and the control data is transmitted by a transmission signal to the terminal device for which the correspondence between the terminal device that generated the monitoring data and the address is set. In the terminal, the operation of the load is controlled by the received control data.

  The automatic switch TS with a heat ray sensor includes a heat ray sensor (not shown) that detects the presence or absence of a person in the detection area by detecting a heat ray emitted from a human body in a predetermined detection area. In addition, the automatic switch TS with a heat ray sensor is connected with a heat ray sensor slave unit TSa including a heat ray sensor for detecting a heat ray emitted from a human body in different detection areas via a slave unit signal line Lsa. The outputs of the heat ray sensor and the heat ray sensor slave unit TSa are monitored, and when any of them detects a heat ray, an interrupt signal is generated and monitoring data is sent to the transmission unit CU.

  The sensor on / off switch SW displays the switch SW1 for turning on / off the control operation of the lighting fixture L by the automatic switch TS with a heat ray sensor and the on / off state of the control operation by the automatic switch TS with a heat ray sensor, respectively. Indicator lights LDa and LDb such as light emitting diodes are provided, and monitoring data is transmitted to the transmission unit CU in response to the pressing operation of the switch SW1.

  The relay control terminal RT includes a relay (not shown) that turns on / off the power supply to the luminaire L that is a load, and turns on / off the corresponding relay according to the received control data, thereby illuminating. The appliance L is turned on or off. In general, a latching type relay is used, and the relay control terminal RT supplies power to the relay in a pulsed manner when the relay is operated.

  Next, the operation of the remote monitoring control system will be briefly described. For the sake of simplicity, the automatic switch TS with a heat ray sensor and the sensor ON / OFF switch SW are collectively referred to as a monitoring terminal.

  The transmission unit CU sends a transmission signal Vs having the format shown in FIG. 3A to the signal line Ls. That is, the transmission signal Vs includes the synchronization signal SY indicating the start of signal transmission, the mode data MD indicating the mode of the transmission signal Vs, and the address (8 of the terminal devices for monitoring (TS, SW for monitoring, SW and relay control terminal RT)) to be accessed. Address data AD indicating bits), control data CD indicating control contents, checksum data CS for detecting a transmission error, and a signal which is a time slot provided for returning a return signal (monitoring data) from the terminal This is a bipolar (± 24V) time-division multiplexed signal consisting of a return period WT, and data is transmitted by pulse width modulation (see FIG. 3B).

  In the monitoring terminals TS and SW and the relay control terminal RT, basically, when the address data AD of the transmission signal Vs received via the signal line Ls and the own address data set in advance match. The control data CD of the transmission signal Vs is fetched and the monitoring data is sent out by short-circuiting the signal line Ls via an appropriate low impedance in synchronization with the signal return period WT of the transmission signal Vs. Signal) to the transmission unit CU.

  Here, when data is transmitted from the transmission unit CU to the desired terminals TS, SW, RT, the mode data MD is set to the control mode, and the address data AD is set to the addresses of the desired terminals TS, SW, RT. If the transmission signal Vs is sent to the signal line Ls, the terminals TS, SW, RT having the same address data AD receive the control data CD and return the monitoring data in the signal return period WT. The transmission unit CU confirms that the control data CD has been transmitted to the desired terminals TS, SW, RT based on the transmitted control data CD and the monitoring data received during the signal return period WT. The relay control terminal RT instructs the relay operation according to the received control data CD, and the sensor on / off switch SW performs operations such as turning on or off the indicator lights LDa and LDb according to the received control data CD.

  On the other hand, the transmission unit CU normally sends a transmission signal Vs in which the mode data MD is set to the dummy mode at a constant time interval (always polling), and the monitoring terminals TS and SW receive monitoring inputs (detection inputs of the heat ray sensor, When any information is to be transmitted to the transmission unit CU according to the switch operation input), the interrupt signal Vi as shown in FIG. 3C is synchronized with the synchronization signal SY of the transmission signal Vs in the dummy mode. generate.

  At this time, the monitoring terminals TS and SW set an interrupt flag to prepare for subsequent information exchange with the transmission unit CU. When the transmission unit CU receives the interrupt signal Vi, the mode data MD is set to the interrupt polling mode and the upper half of the address data AD (the upper 4 bits if the address data AD is 8 bits) is sequentially increased. In the monitoring terminals TS and SW that transmit the transmission signal and generate the interrupt signal Vi, when the upper 4 bits of the address data AD in the transmission signal Vs in the interrupt polling mode match the upper 4 bits of its own address During the signal return period WT, the lower half bits (lower 4 bits) of its own address are returned to the transmission unit CU as monitoring data. Thus, since the transmission unit CU searches for 16 monitoring terminals TS and SW that have generated the interrupt signal Vi one by one, the monitoring terminals TS and SW can be found in a relatively short time.

  When the transmission unit CU acquires the address of the monitoring terminal TS, SW that has generated the interrupt signal Vi, the mode data MD is set to the monitoring mode, and the transmission signal Vs having the acquired address data AD is sent to the signal line Ls. In response to this transmission signal, the monitoring terminals TS and SW return information to be transmitted in the signal return period WT. Finally, the transmission unit CU sends a signal instructing the reset of the interrupt flag to the monitoring terminals TS and SW that have generated the interrupt signal, and cancels the interrupt flag of the monitoring terminals TS and SW. .

  As described above, information transmission from the monitoring terminals TS and SW to the transmission unit CU is performed by four signal transmissions from the transmission unit CU to the monitoring terminals TS and SW (dummy mode, interrupt polling mode, Completed by monitoring mode, interrupt reset). Further, when the transmission unit CU tries to know the operation state of the desired relay control terminal RT, it transmits a transmission signal Vs with the mode data MD as monitoring data and the address data AD as the address of the desired relay control terminal RT. The monitoring data from the desired relay control terminal RT can be acquired during the signal return period WT of the transmission signal Vs.

  Here, when the heat ray sensor part of the automatic switch TS with a heat ray sensor detects a heat ray emitted from the human body and generates a detection signal, or when the switch SW1 of the sensor on / off switch SW is operated to generate an operation signal, The automatic switch TS with a heat ray sensor or the sensor on / off switch SW generates an interrupt signal Vi, and after passing through the transmission procedure described above, monitoring data corresponding to the detection signal of the heat ray sensor unit or the operation signal of the switch SW1 is transmitted to the transmission unit CU. Return to Then, when the transmission unit CU creates the control data CD based on the monitoring data received from the monitoring terminals TS and SW, and transmits the created control data CD to the corresponding terminal, the control data CD is received. The terminal performs a predetermined operation. For example, when monitoring data corresponding to the detection input of the heat ray sensor is returned from the automatic switch TS with a heat ray sensor, the transmission unit CU transmits control data created based on this monitoring data to the relay control terminal RT, When the relay control terminal RT receives the control data, the relay control terminal RT controls the relay to turn on / off the lighting fixture L. When the monitoring data corresponding to the on / off operation of the switch SW1 is returned from the sensor on / off switch SW, the transmission unit CU transmits the control data created based on the monitoring data to the automatic switch TS with a heat ray sensor. When receiving the control data, the automatic switch TS with a heat ray sensor turns on / off the load control operation based on the detection input of the heat ray sensor. Moreover, the automatic switch TS with a heat ray sensor returns monitoring data indicating ON / OFF of the control operation to the transmission unit CU, and the transmission unit CU switches to the sensor ON / OFF switch SW based on the monitoring data. Control data for turning on / off the attached operation monitor indicator lights LDa and LDb is transmitted, and the sensor on / off switch SW that has received the control data receives a corresponding operation monitor based on the control data. The on / off state of the control operation by the automatic switch TS with a heat ray sensor is displayed by turning on or off the display lamps LDa and LDb.

  As described above, in this system, data is exchanged between the terminals using the correspondence relationship of the addresses set in advance in the transmission unit CU, so that the monitoring input of any of the monitoring terminals TS and SW can be made. In response, the operation of the corresponding terminal is controlled.

  Next, the circuit configuration of the automatic switch TS with a heat ray sensor will be described with reference to FIG.

  As shown in the block diagram of FIG. 4, the circuit unit of the automatic switch TS with a heat ray sensor includes a signal processing unit 100, a sensor circuit 101, a slave unit signal transmission / reception circuit 102, a brightness detection circuit 103, and a signal transmission / reception circuit. 104, a power supply circuit 105, a detection state display circuit 106, an operation input circuit 107 including an address setting signal transmission / reception circuit 107a, a brightness setting circuit 107b, and an operation delay time setting circuit 107c, and a nonvolatile memory 108. The

  The sensor circuit 101 includes a heat ray sensor unit (not shown) such as a pyroelectric element that detects heat rays radiated from the human body, amplifies the output of the heat ray sensor unit, and passes through the slave unit signal transmission / reception circuit 102. To the signal processing unit 100. The signal processing unit 100 compares the output of the sensor circuit 101 transmitted via the slave unit signal transmission / reception circuit 102 with the predetermined threshold value stored in the nonvolatile memory 108, thereby comparing the level in the detection area. The presence or absence of a person is determined.

  The cordless handset signal transmission / reception circuit 102 is connected to the heat ray sensor cordless handset TSa via a pair of terminals T2, and full-wave rectifies the transmission signal Vs input via the signal line Ls to make it constant voltage. Then, the operation power supply of the heat ray sensor slave unit TSa is generated and supplied to the heat ray sensor slave unit TSa via the slave unit signal line Lsa, and the voltage between the terminals T2 and T2 is monitored, thereby the heat ray sensor slave unit The output of TSa is monitored. That is, the heat ray sensor slave unit TSa includes a heat ray sensor (not shown) such as a pyroelectric element that detects a heat ray radiated from the human body. When the heat ray sensor detects a heat ray from the human body, the terminals T2 and T2 By lowering the voltage level in between, compared to the non-detection time, the slave unit signal transmitting / receiving circuit 102 is notified that the heat ray has been detected. When the handset signal transmission / reception circuit 102 determines that the heat ray sensor handset TSa has detected a heat ray from the voltage between the terminals T <b> 2 and T <b> 2, it outputs a detection signal to the signal processing unit 100.

  The brightness detection circuit 103 includes brightness sensors (not shown) such as CdS, photodiodes, and phototransistors that detect ambient brightness, and amplifies the output of the brightness sensor to the signal processing unit 100. Output. The signal processing unit 100 compares the brightness of the output of the brightness detection circuit 103 with the predetermined brightness level (setting level) set by the brightness setting circuit 107 b and stored in the nonvolatile memory 108.

  The signal transmission / reception circuit 104 transmits / receives a transmission signal to / from the transmission unit CU via a signal line Ls connected to the pair of terminals T1 and T1, and transmits / receives a transmission signal via the signal line Ls. The input transmission signal is signal-converted and output to the signal processing unit 100, and the signal output from the signal processing unit 100 is converted into a transmission signal and sent to the signal line Ls.

  The power supply circuit 105 performs full-wave rectification on the transmission signal Vs input via the signal line Ls by a full-wave rectifier (not shown), and further converts the transmission signal Vs to a constant voltage by a constant voltage circuit (not shown). Getting circuit power.

  The detection state display circuit 106 turns on detection confirmation means such as an indicator lamp (not shown) provided in the heat ray sensor unit in response to detection of the human body by the heat ray sensor provided in the sensor circuit 101.

  The operation input circuit 107 is used to input values of various setting items (address data, brightness level threshold, operation delay time) related to the operation of the switch, and to confirm the set values.

  The nonvolatile memory 108 is composed of, for example, an EEPROM, and stores values of setting items (address data and the like) input by the operation input circuit 107.

  In addition, when the address data included in the transmission signal received via the signal transmission / reception circuit 104 matches the address data stored in the nonvolatile memory 108, the signal processing unit 100 receives the control data of the transmission signal and responds to the control data according to the control data. Behave. Further, the fact that the transmission signal has been received is transmitted from the terminals T1 and T1 to the signal line Ls through the signal transmission / reception circuit 104.

  Here, operation | movement of the automatic switch TS with a heat ray sensor is demonstrated based on FIG. When an operation to turn off the control operation of the automatic switch TS with a heat ray sensor is performed using the switch SW1 of the sensor on / off switch SW, the sensor on / off switch SW sends an interrupt signal, and after passing through the above transmission processing The on / off address set in the automatic switch TS with a heat ray sensor is returned to the transmission unit CU as a return signal. At this time, the transmission unit CU sends control data for turning off the control operation to the automatic switch TS with the heat ray sensor based on the return signal received from the sensor ON / OFF switch SW, and the automatic switch with the heat ray sensor that has received this control data TS turns off the control operation.

  On the other hand, when an operation for turning on the control operation of the automatic switch TS with a heat ray sensor is performed using the switch SW1 of the switch SW1 for turning on and off the sensor, the same operation as described above is performed, and the control operation of the automatic switch TS with a heat ray sensor is performed. Set to the on state. When the control operation is set to the on state, the automatic switch TS with a heat ray sensor controls the load based on the outputs of the sensor circuit 101, the slave unit signal transmission / reception circuit 102 and the brightness detection circuit 103. In a state where the brightness detected by the brightness sensor is brighter than a predetermined brightness level, the signal processing unit 100 does not perform a control operation even if there is a detection input from the sensor circuit 101 or the slave unit signal transmission / reception circuit 102. On the other hand, when the signal processing unit 100 receives a detection input from the sensor circuit 101 or the slave unit signal transmission / reception circuit 102 in a state where the brightness detected by the brightness sensor is darker than a predetermined brightness level, An interrupt signal is sent, and after passing through the above transmission procedure, ON address data (for example, pattern control pattern P1 with operation holding time data shown in FIG. 5C) is returned to the transmission unit CU as a return signal. Let At this time, the transmission unit CU sends control data to the corresponding relay control terminal RT based on the return signal received from the automatic switch TS with a heat ray sensor, and turns on a plurality of lighting fixtures L in a pattern P1. Thereafter, when a predetermined operation holding time elapses after the detection input is lost, the signal processing unit 100 sends an interrupt signal from the signal transmission / reception circuit 104, and after passing through the above-described transmission procedure, the OFF address data (P2). It is returned to the transmission unit CU as a return signal. At this time, the transmission unit CU sends control data to the corresponding relay control terminal RT based on the return signal received from the automatic switch TS with a heat ray sensor, and thins the lighting fixture L in the illumination range set by the pattern P2. (See FIG. 5 (c)).

  When the load is delayed for the time set by the operation delay time setting circuit 107c, the signal processing unit 100 causes the signal transmission / reception circuit 104 to send out an interrupt signal when the detection input is received, and After passing through the transmission procedure, the address (referred to as a delay address) of the relay control terminal RT that controls the load is sent back to the transmission unit CU as a return signal. At this time, the transmission unit CU sends control data for turning on the load to the corresponding relay control terminal RT based on the return signal received from the automatic switch TS with a heat ray sensor, and operates (ON) the load. The signal processing unit 100 causes the signal transmission / reception circuit 104 to send out an interrupt signal when a predetermined operation holding time elapses after the detection input is lost and then a predetermined operation delay time elapses, and the above transmission procedure is performed. After that, the data of the delay address is returned to the transmission unit CU as a return signal. At this time, the transmission unit CU sends control data for turning off the load to the corresponding relay control terminal RT based on the return signal received from the automatic switch TS with a heat ray sensor, and stops (OFF) the corresponding load (FIG. 5 (d)).

  Next, the structure of the automatic switch TS with a heat ray sensor of the present embodiment will be described with reference to FIGS. 1 and 6 to 9. In the present embodiment, the device main body 2 is housed inside the case 1 and the case 1 is covered with a cover 10. The directions described in the following description correspond to the directions of the orthogonal coordinates shown in FIG.

  First, the case 1 will be described with reference to FIG. 1 (a), FIG. 6, FIG. 7, and FIG.

  The case 1 includes a front case 20, a rear case 30 disposed on the rear surface side of the front case 20 and forming a storage space for the device main body 2 together with the front case 20, and a packing 40 disposed on the rear surface side of the rear case 30. Composed. The case 1 is installed on an outer wall or the like via an insulating mounting frame 50 housed in a recess on the rear surface side of the packing 40.

  The front case 20 is a synthetic resin molded product, and is integrally provided with a base 21 having a rectangular parallelepiped shape and an open rear surface, and a projecting base 22 that is a front surface of the base 21 and projects inward from the peripheral wall of the base 21. Formed.

  In the base 21, a mounting hole 23 a through which a mounting screw 60 a described later is inserted is drilled above the projecting base 22. In addition, a rectangular concave surface 24 is formed below the protrusion 22 in the base 21, a pair of upper and lower engagement holes 24 a is formed at the right end of the concave surface 24, and a rectangular engagement surface that is elongated in the vertical direction at the left end of the concave surface 24. A stop hole 24b is opened. A concave portion 24c is formed in the center of the concave surface 24, and a mounting hole 23b through which a mounting screw 60b described later is inserted is formed in the concave surface of the concave portion 24c.

  The protruding base 22 has a width dimension in the left-right direction smaller than the width dimension of the base portion 21, and a lower portion thereof is a pedestal portion 25 protruding forward from other portions of the protruding table 22. The pedestal portion 25 includes a rectangular parallelepiped pedestal base portion 25a and a pedestal main body portion 25b formed on the upper portion of the pedestal base portion 25a. A spacer portion 25c protruding forward is provided at the lower end of the front surface of the pedestal base portion 25a. Further, an exposure window 20a that opens continuously to the front surface of the base 21 is provided on the lower surface of the pedestal base portion 25a. Furthermore, holding ribs 25d project from the lower surface of the pedestal base portion 25a on the left and right sides of the exposure window 20a so as to straddle the front surface of the pedestal base portion 25a. The front surface of the pedestal main body 25b is formed by being bent in multiple stages as viewed from the side so that the front wall 10c of the cover 10 does not contact when the cover 10 is attached. Further, a lens holding portion 25e continuous from the upper surface of the pedestal main body portion 25b is projected on the inner surface of the pedestal 22, and the inner surface of the pedestal main body portion 25b extends over the joint portion between the front surface and the left and right side surfaces. A holding rib 25f is projected. Further, a bent portion 26 is formed on the front surface of the pedestal portion 25 and has an inverted convex shape with a closed upper portion and is freely deflectable in the front-rear direction. 26a protrudes.

  A pair of operation knob holes 27a, an LED window 27b, and a setting window 27c are opened on the front surface of the protrusion 22 and above the pedestal 25, and between the operation knob hole 27a and the setting window 27c. Has a mounting hole 22a. Reinforcing ribs 22b are formed on the inner surface of the protrusion 22 so as to straddle the connecting portion between the front surface and the side surface. In addition, a pair of left and right auxiliary fitting holes 28 a are opened upward on the upper surface of the projecting table 22, which is a coupling part between the projecting table 22 and the base 21. 22, a pair of left and right fitting grooves 28b are formed in the vertical direction, and a pair of left and right fitting holes 28c are opened on the upper surface of the pedestal base 25a at the joint between the pedestal 25 and the base 21. is doing. Further, a pair of assembly holes 29a communicating with the inside and outside of the projecting table 22 are opened on both the left and right side surfaces of the projecting table 22 and between the upper end of the projecting table 22 and the fitting groove 28b. A pair of assembly holes 29b communicating with the inside and outside of the protrusion 22 are opened on both the left and right side surfaces.

  The rear case 30 is a synthetic resin molded product, and is formed on the substrate portion 30a, an upper piece 30b projecting substantially in an L shape from the upper portion of the substrate portion 30a, and formed on the lower portion of the substrate portion 30a than the substrate portion 30a. It is comprised from the lower piece 30c with wide left-right width | variety, and the side board 30d provided in the left-right both-sides edge of the board | substrate part 30a and the upper piece 30b (refer FIG. 7).

  A screw receiving boss 31 protrudes from the central portion and the upper portion of the substrate portion 30a, and a draining plate 32 continuous with the side plate 30d is formed at a portion extending from the substrate portion 30a to the lower piece 30c. Further, four sets of terminal portions 33 having a pair of upper and lower engaging holes 33a and 33b are arranged in the left-right direction on the upper portion of the substrate portion 30a.

  The upper piece 30b has a rectangular shape with a dent at the center upper part, and mounting bosses 34 project forward from the left and right ends.

  A pair of left and right engaging holes 35a are opened at the lower portion of the lower piece 30c. A pair of left and right sandwiching ribs 35b and a holding rib 35c are projected between the left and right draining plates 32.

  A pair of left and right assembly leg pieces 37a provided with an assembly hook 36a that engages with an assembly hole 29a provided in the front case 20 is provided on the upper side of the side plate 30d. A pair of left and right assembly leg pieces 37b provided with an assembly hook 36b that engages with an assembly hole 29b provided in the front case 20 is provided below the drain plate 32 below the side plate 30d. A pair of left and right alignment projections 38 for aligning a circuit board 90 to be described later are provided in the center of the front side of the side plate 30d.

  The packing 40 is formed from an elastic material such as soft vinyl chloride in a substantially rectangular parallelepiped shape having a substrate portion 40a and a peripheral wall 40b. Here, the peripheral wall 40 b is formed so that its outer peripheral surface is along the inner peripheral surface of the peripheral wall of the base 21. A peripheral rib 41 along the rear part of the peripheral wall of the base 21 is formed on the outer periphery of the peripheral wall 40b. When the packing 40 is attached to the front case 20, the peripheral wall of the base 21 and the peripheral rib 41 are flush with each other. A fitting groove 42 for fitting a fitting rib (not shown) formed on the rear surface of the base 21 is formed on the front surface of the peripheral wall 40b in a shape corresponding to the fitting rib. A rectangular opening window 43 through which the signal line Ls and the slave unit signal line Lsa are passed is formed at a portion corresponding to the protruding base 22 in the substrate portion 40a. Further, a mounting hole 44a through which a mounting screw 60a (described later) is inserted is drilled in the upper center portion of the substrate portion 40a, and a mounting hole 44b through which a mounting screw 60b (described later) is inserted is drilled in the lower center portion of the substrate portion 40a. Has been.

  The insulating mounting frame 50 is formed from an insulating material in a substantially rectangular shape, and is fixed to the outer wall via a pair of upper and lower mounting holes 51. In addition, an opening window 52 through which the signal line Ls and the slave unit signal line Lsa are passed is formed at the center, and a screw mounting base 53a in which a nut is embedded at the upper end of the insulating mounting frame 50, and a nut is embedded at the lower end. The screw mounting base 53b is formed.

  The case 1 is formed by combining the front case 20, the rear case 30, and the packing 40 described above. As shown in FIG. 6, the rear case 30 holds the device main body 2 on the front surface, and is attached to the front case 20 by engaging the assembly hook 36a with the assembly hole 29a and the assembly hook 36b with the assembly hole 29b. At this time, the upper end of the upper piece 30b comes into contact with the upper part of the inner peripheral wall of the projecting table 22, the side surface of the lower piece 30c comes into contact with the base 21 at the lower part of the projecting table 22, and the side surface of the side plate 30d comes into contact with the inner surface of the projecting table 22. Abut. The packing 40 is attached to the front case 20 by fitting a fitting rib (not shown) formed on the rear surface of the base 21 into the fitting groove 42. In the case 1 thus formed, a pair of mounting screws 60a and 60b are inserted from the front into the mounting holes 23a and 23b and the mounting holes 44a and 44b, respectively, and screwed into the screw mounting bases 53a and 53b. Thus, the insulating mounting frame 50 is integrally coupled. The concave surface 24 is formed by a rectangular lid 61 having a pair of upper and lower engaging projections 61a locked to the engaging hole 24a and a pair of upper and lower engaging pieces 61b locked to the locking hole 24b. Covered. Further, a name plate 62 having holes corresponding to the operation knob hole 27a, the LED window 27b, and the setting window 27c is attached to the front surface of the stand 22 via the attachment hole 22a.

  Secondly, the device main body 2 will be described with reference to FIG.

  The device body 2 includes a lens unit 70 and a circuit board 90.

  The lens unit 70 is formed in a substantially hemispherical shape by coupling the lens base 71, the light receiving lens 72, and the lens frame 73, and between the lens base 71 and the light receiving lens 72, a heat ray sensor 74, an LED 75, A sensor board 78 having a photodiode 76 with a spacer 76a and a connector 77 is accommodated.

  The lens base 71 has a shape in which a ring and the upper end of a sphere are connected by a disk, and a fitting recess 71a and a fitting protrusion 71b are provided in the ring portion. The light receiving lens 72 is provided with a compound lens portion 72a formed of a translucent material capable of transmitting heat rays at a central portion, and a peripheral portion is a holding portion 72b held between the lens base 71 and the lens frame 73. It has become. The compound lens portion 72a has a dome shape as a whole and is divided into a plurality of minute lenses. In other words, since the heat ray sensor 74 outputs a signal only when the incident heat dose changes, the detection region of the heat ray sensor 74 is divided into a plurality of small regions to detect minute movements of the human body within the detection region. I can do it. The lens frame 73 is formed in an annular shape having a fitting convex part 73a and a fitting groove 73b on the upper part and a ring part 73c on the inner peripheral wall. The fitting convex portion 73a is fitted into the fitting concave portion 71a, the fitting groove 73b is fitted into the fitting projection 71b, and the holding portion 72b of the light receiving lens 72 is locked to the ring portion 73c.

  The sensor board 78 includes a sensor circuit 101, a brightness detection circuit 103, and a detection state display circuit 106, and is connected to the circuit board 90 via a connector 77. The LED 75 is a detection confirmation means for confirming the detection region of the heat ray sensor 74, and is provided in the detection state display circuit 106 and lights up in response to detection of the heat ray by the heat ray sensor 74. The photodiode 76 is provided in the brightness detection circuit 103 and functions as a brightness sensor.

  The lens unit 70 is attached to the lens holding frame 80 so as to swing freely. The lens holding frame 80 is formed in an L shape so as to be attached to an exposure window 20a formed continuously from the lower surface of the pedestal base portion 25a to the front surface of the base 21. In other words, the lens holding frame 80 has a horizontal plate 81 that is locked to the holding rib 25d on the lower surface of the pedestal base portion 25a, and a vertical plate 82 that matches the base 21. A cylindrical holding frame portion 81a is formed in the central portion of the horizontal plate 81 so as to penetrate vertically. The inner diameter of the holding frame portion 81a has a dimension between the outer diameter of the lower end portion and the upper end portion of the lens frame 73, and the lens portion 70 does not fall off from the holding frame portion 81a and is necked inside the holding frame portion 81a. It can be swung.

  The projecting plate portions 81b projecting from the left and right sides of the rear end of the horizontal plate 81 are sandwiched by the sandwiching ribs 35b provided in the rear case 30, and a pair of engagements provided at the rear lower end portion of the vertical plate 82. A protrusion (not shown) is locked in the engagement hole 35a. In this way, the lens unit 70 and the lens holding frame 80 are temporarily held by the rear case 30. When the front case 20 is attached to the rear case 30, the front end portion of the horizontal plate 81 is supported by the holding rib 25 d with the holding frame portion 81 a exposed from the exposure window 20 a, and the vertical plate 82 is the front surface of the base 21. And become the same. And the lens base 71 is arrange | positioned under the lens holding | suppressing part 25e. In addition, a plate spring 79 that is engaged with the holding rib 25f of the front case 20 and the holding rib 35c of the rear case 30 is disposed on the upper portion of the lens unit 70, and the plate spring 79 limits the swing angle of the lens unit 70. Is done. In this manner, the lens case 70 and the lens holding frame 80 are fixed to the case 1 by coupling the rear case 30 and the front case 20 together.

  The circuit board 90 includes a signal processing unit 100, a slave signal transmission / reception circuit 102, a signal transmission / reception circuit 104, a power supply circuit 105, an operation input circuit 107, and a nonvolatile memory 108.

  Four locking holes 90a are arranged in the left-right direction at the upper part of the circuit board 90, mounting holes 90b are drilled at the upper center and lower part, a pair of base posts 90c are attached to the lower part, and positions are provided on the side surfaces. An alignment groove 90d is formed. In this circuit board 90, the positioning protrusions 38 are fitted into the positioning grooves 90d, and a pair of mounting screws (not shown) inserted through the mounting holes 90b are screwed into the screw receiving bosses 31 to be attached to the rear cover 30. It is attached. A terminal block 91 attached to the terminal portion 33 from behind the rear case 30 through the locking holes 33a and 33b is locked to the locking hole 90a by the upper terminal plate 91a. The terminal block 91 connects the transmission unit CU and the heat ray sensor slave unit TSa and the device main body 2 via the signal line Ls and the slave unit signal line Lsa drawn from the construction surface and passing through the opening windows 52 and 43. . The base post 90 c connects the circuit board 90 and the sensor board 78 via the connector 77.

  A volume 92 and a volume 93 having a rotatable knob are provided at the lower front portion of the circuit board 90. The volume 93 is provided via a spacer 93a. On the left side of the volume 93, LEDs 94a and 94b and a photodiode 94c are provided. The volume 92 is connected to the brightness setting circuit 107b, and the brightness level threshold value stored in the nonvolatile memory 108 can be switched by turning the knob. The volume 93 is connected to the operation delay time setting circuit 107c and adjusts the operation delay time. The LED 94b and the photodiode 94c are provided in the address setting signal transmission / reception circuit 107a, and transmit / receive address data to / from a predetermined setting device by an optical signal. The LED 95a is provided as an informing means for informing whether the transmission / reception is correctly performed.

  When the case 30 is fixed to the front case 20 after holding the device body 2, the volumes 92 and 93 protrude from the operation knob hole 27 a of the front case 20. Here, on the nameplate 62 attached to the front surface of the stand 22, the brightness level threshold value or the operation delay time is written in accordance with the rotational position of the volume 92 or 93. At this time, the LED 94a is exposed from the LED window 27b, and the LED 94b and the photodiode 94c are exposed from the setting window 27c.

  Third, the cover 10 will be described with reference to FIGS. 1 and 8.

  The cover 10 is formed of a waterproof material such as a synthetic resin and includes an upper wall 10a, left and right side walls 10b, and a front wall 10c. The left and right side walls 10b have a vertical trapezoidal shape whose lower side is longer than the upper side. The cover 10 is attached to the front case 20 so as to cover the upper surface, the left and right side surfaces, and the front surface of the protrusion 22.

  A pair of auxiliary fitting pieces 11a protruding downward are formed at the rear end of the upper wall 10a. Further, a pair of fitting pieces 11b projecting inward are formed in the rear end central portion of the left and right side walls 10b, and a pair of fitting pieces 11c projecting inward are formed in the lower rear end portions of the left and right side walls 10b. A locking projection 11d is provided at the lower end of the fitting piece 11c.

  On the inner wall surface of the front wall 10c, reinforcing ribs 12a and 12b extending left and right are formed so as to divide the front wall 10c into three in the vertical direction. The upper part of the cover 10 straddles the side wall 10b and the front wall 10c. A pair of left and right convex ribs 12c are formed. Moreover, the inclined surface 13 which the thickness becomes thick is formed in the lower end part of the front wall 10c as it goes to a lower end. These reinforcing ribs 12a, 12b, convex ribs 12c, and inclined surface 13 suppress distortion of the front wall 10c. In addition, six hooking claws 14 arranged in the left-right direction protrude from the inclined surface 13. When viewed from the side, the latching pawl 14 has a substantially “f” shape in which the lower surface is inclined and the upper surface is horizontal. Further, the protruding height of the latching claw 14 is such that when the cover 10 is fixed to the front case 20, the protruding end of the latching claw 14 is positioned between the protruding end of the latched portion 26 a and the front surface of the bent portion 26. Designed to the height you want. As shown in FIG. 1B, an inclined portion 15 that is thicker than the front wall 10c and increases in thickness as it goes downward is formed at the center of the lower end of the front wall 10c. The inclination angle of the inclined portion 15 is an angle between the inclination angle of the front wall 10 c and the inclination angle of the bending portion 26.

  Finally, fixing and removing the cover 10 will be described.

  In order to fix the cover 10 to the case 1, first, the cover 10 is pushed backward in the horizontal direction at a height at which the fitting piece 11c comes between the fitting groove 28b and the fitting hole 28c, and the rear surfaces of the left and right side walls 10c are The base 21 is brought into contact with the front surface. Next, the cover 10 is slid downward, and the fitting piece 11b is inserted into the fitting groove 28b, whereby the cover 10 is locked to the front case 20 so as to be slidable in the vertical direction. When the cover 10 is slid downward from here, the lower part of the latching claw 14 provided on the front wall 10 c comes into contact with the latched part 26 a formed on the front surface of the front case 20. When the cover 10 is further slid downward, the latching claw 14 pushes the latched portion 26a and deflects the bent portion 26 backward. When the cover 10 is further slid downward and the hooking claw 14 reaches below the hooked portion 26a, the bent portion 26 pushed backward is returned to the front. At this time, the upward movement of the hooking claw 14 is restricted by the hooked portion 26 a, and the cover 10 is fixed to the front case 20. At this time, the auxiliary fitting piece 11a is fitted into the auxiliary fitting hole 28a and the locking projection 11d is fitted into the fitting hole 28c, and the inclined surface 13 is in contact with the spacer portion 25c. Further, a gap B that becomes narrower upward is formed between the bent portion 26 and the inclined portion 15 (see FIG. 1B), and the gap between the lower end of the inclined portion 15 and the bent portion 26 is as shown in FIG. As shown, an opening A occurs.

  In order to remove the cover 10 from the front case 20, first, the jig J is inserted from below into the opening A formed between the bent portion 26 and the lower end of the inclined portion 15. Next, the jig J is pushed upward. Here, since the inclined portion 15 has a thickness, the distortion of the front wall 10c due to the pressing of the jig J is reduced as compared with the case where the inclined portion 15 is not provided. Moreover, since the clearance gap B which becomes narrow as it goes upwards is formed between the bending part 26 and the inclination part 15, it is easy to push in the jig | tool J. FIG. When the jig J is pushed upward in this way, the bent portion 26 is pushed backward in the horizontal direction (rightward in FIG. 1B) by the jig J, and the gap B between the bent portion 26 and the inclined portion 15 is pushed. Is expanded. Therefore, the latching claw 14 is detached from the latched portion 26a simply by pushing the jig J upward to a predetermined position. From this state, it is possible to remove the cover 10 by sliding the cover 10 upward to remove the fitting piece 11b from the fitting groove 28b.

  As described above, the automatic switch TS with a heat ray sensor of the present embodiment has a gap B that gradually narrows toward the upper part between the bent portion 26 and the inclined portion 15 at the lower end of the center portion of the front wall 10c of the cover 10. The inclined portion 15 is formed so as to be formed. Accordingly, it is not necessary to push the jig J in the horizontal direction when removing the cover 10, and the distortion of the cover 10 when the hooking claws 14 are hooked is reduced compared to the conventional case. Therefore, the possibility that the left and right side walls 10b of the cover 10 and the side surface of the front case 20 are in close contact with each other as in the conventional case is reduced, and the cover 10 can be easily removed.

In this embodiment, the automatic switch with a heat ray sensor is exemplified as the electric device, but the electric device to which the technical idea of the present invention can be applied is not limited to the automatic switch with a heat ray sensor, and is exemplified in the conventional example. Any electrical device that needs waterproofing, such as a waterproof outlet, may be used.
(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. However, in FIG. 10A, the structure of the cover 10 is schematically shown in order to emphasize the features of the present embodiment. In addition, since this embodiment is the same as that of the said Embodiment 1 except the structure of the latching claw 14, it attaches | subjects the same code | symbol about a common component, and abbreviate | omits description.

  The latching claw 14 of the present embodiment is composed of six claw-shaped portions that are substantially “F” -shaped when viewed from the side as in the first embodiment. And the protrusion height of the latching claw 14a close | similar to the inclination part 15 is the highest, The protrusion height becomes low as it leaves | separates from the inclination part 15, It is characterized by the above-mentioned.

  When removing the cover 10 from the front case 20, if the jig J is inserted into the opening A at the lower end of the bent portion 26 and the inclined portion 15, the front wall 10c is distorted. At this time, if the protruding heights of the latching claws 14 are all the same, the latching claw 14a close to the inclined part 15 is detached from the latched part 26a, but the latching claw 14c separated from the inclined part 15 is used. Is in a state of being hooked on the hooked portion 26a.

  On the other hand, as shown in FIG. 10A, even if the front wall 10c is distorted by inserting the jig J when the protruding height of the latching claw 14 is lowered as the distance from the inclined portion 15 is increased as in this embodiment. At the same time that the hooking claw 14a close to the inclined portion 15 is detached from the hooked portion 26a, the hooking claw 14c separated from the inclined portion 15 is also released from the hooked portion 26a. That is, compared with the case where all the protrusion heights of the latching claw 14 are the same, the latching claw 14 is detached from the to-be-latched part 26a by the pushing amount of the jig | tool J small. Thereby, when removing the cover 10, the excessive distortion of the front wall 10c is suppressed, and the cover 10 can be removed easily.

  In this embodiment, the left and right three hooking claws 14a, 14b, and 14c are used, but the hooking claws 14 are not limited to this. For example, as the latching pawl 14, as shown in FIG. 10 (b), the protrusion height is high at a location close to the inclined portion 15, and the left and right ones are inclined so as to decrease as the distance from the inclined portion 15 decreases. You may use the latching claw 14d.

DESCRIPTION OF SYMBOLS 1 Case 2 Apparatus main body 10 Cover 14 Latching claw 15 Inclined part 20 Front case 22 Protrusion base 25 Base part 26 Deflection part 26a Hook part 30 Rear case

Claims (3)

A device main body having a predetermined function, a substantially box-shaped case for housing the device main body, a cover formed of a waterproof material, a locking means for detachably attaching the cover to the case, A fixing means for fixing the cover to the case; and a releasing means for releasing the fixing of the cover by the fixing means,
The fixing means includes a hooking claw protruding from the cover and a hooked portion provided on the case for hooking the hooking claw, and the releasing means is provided integrally with the hooked portion. The bent portion is formed of a flexible portion that is freely bent between a position where the hooking claw is hooked and a position where the hook is not hooked.
An opening for inserting a jig is provided between the bent portion and the cover, and an inclined portion that gradually reduces the distance from the bent portion along the insertion direction of the jig. , Formed on the surface facing the bent portion of the cover ,
The electrical hook is characterized in that the protruding height of the hooking claw gradually decreases as the hooking claw moves away from the inclined portion .   The electric device according to claim 1, wherein the locking means includes a fitting groove provided in the case and a fitting piece provided in the cover and slidingly fitted to the fitting groove. The apparatus main body includes a heat ray sensor that detects a heat ray emitted from a human body, and a signal processing unit that outputs an on / off signal according to the presence or absence of a person based on the output of the heat ray sensor. The electric device according to claim 1 or 2 .

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