JP5553594B2 - Terminal block and transmitter - Google Patents

Description

  The present invention relates to a terminal block that removably fixes an end of a wiring, and relates to a technique that is effective when applied to, for example, a terminal block provided inside a transmitter of a disaster prevention system and a transmitter using the terminal block.

  Some electronic devices with built-in electronic components are provided with a terminal block for transmitting / receiving signals to / from an external device so that one end of a wiring as a transmission line can be electrically connected. For example, in a disaster prevention system that has sensors such as fire detectors and gas leak detectors and receivers that issue alarms in response to signals from these sensors, in addition to the sensors, when a person detects a fire, the switch is turned on. A transmitter having a push button and a switch for detecting that the push button has been operated is provided as a device that informs the receiver of the occurrence of a fire by turning it on.

  Such a transmitter is provided with a terminal block for electrically connecting one end of the wiring connecting the transmitter and the receiver, in order to transmit the fact that the switch is turned on to the receiver as an electrical signal. The terminal block is a component for holding a terminal plate to which a screw and a square nut or washer screwed to the screw and a lead tip extending from the switch are welded. When installing a disaster prevention system, the construction worker loosens the screw on the terminal block, inserts the end of the wiring into the gap between the terminal plate and the washer, and tightens the screw to tighten one end of the wiring. The part can be electrically connected and fixed.

Japanese Utility Model Publication No. 5-79825

  The transmitter 120 of the disaster prevention system is attached to a mounting plate such as a front cover of a storage box 110 provided integrally with the fire hydrant 100 as shown in FIG. It is stored and placed in the hallway of the building, or it is attached to the wall alone. When connecting the end of the wiring that constitutes the transmission line of the disaster prevention system in the building to such a transmitter, loosen the screws provided on the terminal block of the transmitter attached to the mounting plate. It is necessary to tighten. However, in the conventional terminal block, as shown in FIG. 8, the terminal plate 15 is configured to be perpendicular to the mounting plate 20, that is, the tightening screw 16 is parallel to the mounting plate 20. When the operator is operated, the operator's hand comes into contact with the mounting plate, resulting in poor workability and difficulty in tightening the screws sufficiently.

  Further, in a terminal block that does not take any countermeasures, if the screws are loosened too much, the screws will fall off and the subsequent work will be very troublesome, so it is desirable to have a structure that does not fall off even if the screws are loosened. As a device for preventing a screw from falling off in a conventional terminal block, for example, there is one described in Patent Document 1. The device of the terminal block described in Patent Document 1 is provided with a boss part substantially equal to the thread diameter of the screw part at the tip of the tightening screw, and more than the diameter of the boss part between the boss part and the screw. A thin neck is provided, the washer is positioned on this neck, the boss is inserted through the round hole in the terminal plate, and the screw inserted in the square nut is screwed to allow the wiring between the washer and the terminal plate. The tip is sandwiched and connected, and the boss can prevent the screw from falling off.

  However, in the terminal block according to the present invention, since it is necessary to form a boss portion at the tip of the screw, the processing of the screw is troublesome, and the boss portion is formed in a state where a square nut is screwed onto the screw. Therefore, there is a problem that workability is poor and processing is difficult. In addition, there is a technique in which a screw is prevented from falling off by assembling a screw, a terminal plate, a washer, and a square nut together and then crimping the tip of the screw. However, even with this technique, the tip end of the screw is caulked in the assembled state, so that there is a problem that it is difficult to fix the parts and caulking work is particularly difficult when the screw is small.

  The present invention has been made paying attention to the problems as described above, and an object of the present invention is to provide a terminal block capable of improving workability when connecting ends of wiring by tightening screws. There is.

  Another object of the present invention is to provide a terminal block that can prevent a screw from coming off easily when the screw is loosened too much without subjecting the screw to troublesome processing.

In order to solve the above problems, the invention described in claim 1
A terminal plate having a joint surface joined to a wall surface or a board surface, and having a connection portion to which an end portion of the wiring is electrically connected; and a tightening screw screwed into a screw hole provided in the terminal plate; A washer that is inserted into the tightening screw, the washer is inserted into the tightening screw, the terminal plate is screwed into a screw portion of the tightening screw, and the washer is a head of the tightening screw. A terminal block having a storage portion for storing a terminal screw set assembled so as to be positioned between the terminal plate and the terminal plate,
The storage portion has a pair of holding walls that are arranged opposite to each other so as to stand up with respect to the joint surface and hold the terminal plate,
On the inner side of the pair of holding walls, grooves that can be inserted by inclining the terminal plate so that the tightening direction of the tightening screw is directed to the joining surface are formed, respectively .
Ribs for preventing the washer from falling off are formed at the ends of the pair of holding walls in the direction of the fastening screws and on the side where the heads of the fastening screws of the terminal screw set are stored, respectively, When the fastening screw is turned in the loosening direction with the terminal screw set stored in the storage portion and the washer abuts against the rib, the screw portion of the fastening screw comes out of the screw hole of the terminal plate. The length of the tightening screw and the position of the groove are set so as not to be present.

  According to the first aspect of the present invention, since the inclined groove is formed in the wall surface of the storage portion, and the terminal plate is inserted along the groove, the terminal plate is stored in the storage portion in a posture inclined outward. As a result, the tightening operability of the tightening screw is improved. In addition, since a screw hole is provided in the terminal plate, a round washer can be used as a washer. When a round washer is used, the terminal screw assembly is kept in a tightened state when being stored in the storage section. Therefore, the work efficiency of the assembly work on the assembly line and the wiring connection work on site is increased.

Further , according to the first aspect of the present invention, the side of the holding wall constituting the storage portion where the head of the tightening screw is stored, that is, the side where the tip of the driver faces the head of the screw (hereinafter referred to as the opening of the storage portion). Since the rib is formed at the end of the terminal), when the screw and the washer move to the opening side of the storage part when the terminal screw assembly stored in the storage part is loosened, the washer To prevent the screw from dropping off from the opening side of the storage part because the movement is blocked by the rib provided on the opening part of the storage part and the movement of the tightening screw is made difficult by the washer. Can do. Furthermore, since the process of caulking the tip of the tightening screw is not required to prevent falling off, the cost can be reduced.

The invention according to claim 2 is the terminal block according to claim 1 ,
The tightening screw has a neck portion having a diameter smaller than the outer diameter of the screw portion in the vicinity of the head portion, and a washer having an insertion hole having a diameter smaller than the outer diameter of the screw portion is inserted into the neck portion. It is characterized by that.

According to the second aspect of the present invention, when the tightening screw is loosened in a state where the terminal screw set is stored in the storage portion, the washer hits the rib provided at the end portion on the opening side of the storage portion. When the movement is blocked, the screw is prevented from moving when the screw portion hits the washer, so that it is possible to reliably prevent the screw from dropping from the opening side of the storage portion.

The invention according to claim 3 is the terminal block according to claim 1 or 2 ,
The washer is a rectangular square washer.

According to the third aspect of the present invention, since the square washer is used, when connecting the wiring, the end of the wiring is surely sandwiched between the washer and the terminal plate, thereby preventing the connection failure. it can.

Invention of Claim 4 is a terminal block in any one of Claims 1-3 ,
The pair of holding walls are parallel walls provided in parallel to each other.

According to the invention described in claim 4 , the terminal plate can be formed and inserted easily and accurately.

The invention according to claim 5 is the terminal block according to claim 1, 2, or 4 ,
The washer is a rectangular square washer, and the pair of holding walls have an opposing width that restricts rotation of the square washer.

According to the fifth aspect of the present invention, when the tightening screw is tightened in a state where the terminal screw set is housed in the housing portion, the rotation of the square washer can be reliably limited by the pair of holding walls. become able to.

Invention of Claim 6 is a terminal block in any one of Claims 1-5 ,
The terminal board is directly formed with a screw hole into which a screw portion of the tightening screw is screwed.

Wherein the terminal plate may be fixed to the female screw member with the fastening screw hole which the screw portion is screwed in the screw, but according to the invention described in claim 6, screw holes to the terminal plate Is directly formed, so the number of parts can be reduced and the cost can be reduced.

The invention according to claim 7 is the terminal block according to any one of claims 1 to 6 ,
The storage portion is a storage recess formed in a concave shape and having a back wall and a bottom wall, and the bottom wall is formed with a groove into which an end of the terminal plate can be engaged. .

According to the seventh aspect of the present invention, since the three sides of the terminal plate are respectively engaged with the grooves formed in the wall constituting the storage recess, the terminal plate is placed in the storage recess in a more stable state. Can be assembled.

The invention according to claim 8 is the terminal block according to claim 7 ,
A plurality of sets of the storage recesses are provided with the back walls back to back.

According to the invention described in claim 8, when a plurality of storage recesses for storing the terminal screw set are provided, the back walls are arranged back to back to each other, so that they are arranged in a row. Space can be made compact.

The invention according to claim 9 is the terminal block according to any one of claims 1 to 8 ,
The terminal plate is formed with a projection protruding from the terminal screw assembly insertion side end as the connection portion, and the base of the projection has a shape with a smaller cross-sectional area toward the tip side. .

According to the ninth aspect of the present invention, since the base portion of the projection as the connection portion has a shape in which the cross-sectional area becomes smaller toward the distal end side, it can be made difficult to be damaged when bent.

The transmitter according to claim 10 is:
The terminal block according to claim 9, a printed board on which an electronic component is mounted so as to cover an opening end formed at the terminal screw assembly insertion side end of the terminal block, and is held by the terminal block and switches, engage a push button for the switch to the oN state when operated provided corresponding to said switch, said printed circuit board in which the tip of the protrusion of the front SL terminal plate engages It is characterized in that a hole is provided.

According to the invention of claim 10, since the printed circuit board is attached so as to cover the terminal screw assembly insertion side opening end of the terminal block , the printed circuit board functions as a holding member for the terminal screw assembly in the storage portion . The printed circuit board and the component electrically connected to the component on the substrate can be connected with the shortest distance, and the entire transmitter can be configured compactly. Further, when the printed circuit board is attached to the terminal block, the projection as the connecting portion functions as a positioning member for the printed circuit board, so that the printed circuit board can be mounted accurately and quickly.

  ADVANTAGE OF THE INVENTION According to this invention, the terminal block which can improve the workability | operativity at the time of tightening a screw and connecting the edge part of wiring is realizable. Further, there is an effect that it is possible to realize a terminal block that can prevent a screw from easily falling off when the screw is loosened too much without subjecting the screw to troublesome processing.

It is a cross-sectional top view which shows the structure of one Embodiment of the terminal block which concerns on this invention. It is a rear view which shows the structure of the terminal block of embodiment. The 2nd Embodiment of the terminal block which concerns on this invention is shown, (A) is an expanded rear view which shows the terminal screw assembly accommodated with one accommodation recessed part, (B) is the BB line in (A). FIG. It is an expanded rear view which shows one accommodation recessed part and the accommodated terminal screw group which show the modification of 2nd Embodiment of the terminal block which concerns on this invention. It is a perspective view which shows the example of the jig | tool for an assembly used for assembling a terminal screw assembly. It is a perspective view which shows the example of the jig | tool for insertion used in order to insert the terminal screw group examined prior to this invention in the storage recessed part of the terminal block of embodiment. It is a perspective view which shows the outline of the transmitter as an example of a suitable apparatus to which the terminal block of this invention is applied, and a fire hydrant provided with the same. It is a cross-sectional top view which shows the structure of the terminal block examined prior to this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment when the present invention is applied to a terminal block built in a transmitter of a disaster prevention system as an example. The terminal block 10 of this embodiment includes a disk-shaped mounting base portion 11 having a peripheral edge portion joined to the front surface of a mounting plate 20 such as a front lid of a storage box and fixed by fixing screws 21 and 21, and the base portion. 11 and a terminal block 12 that is inserted into an opening 22 formed in the mounting plate 20 and protrudes rearward. Although not particularly limited, the base portion 11 and the terminal block portion 12 are integrally formed of synthetic resin.

  A storage space is formed from approximately the center of the base portion 11 to approximately the center of the terminal base portion 12. The storage space includes a push button 31 and a micro switch for detecting that the push button 31 is operated. And the like, the interlocking pin 33 that transmits the movement of the push button 31 to the sensor 32, and the compression spring 34 that is inserted into the interlocking pin 33 and biases the push button 31 away from the sensor. It is configured as follows.

  An electronic circuit having a function of generating a signal to be sent to a receiver (monitoring device) or a signal for driving a bell based on the detection signal of the sensor 32 is configured on the rear end surface of the terminal block 12. An electronic component such as a resistor or an IC is mounted, and a printed circuit board 35 on which a wiring pattern for electrically connecting the component and the component and an external terminal is formed is bonded. A lead wire (not shown) drawn from the sensor 32 or a terminal provided on the sensor is connected to a predetermined terminal of the printed circuit board 35 by soldering or the like. A cover plate 36 for protecting the printed board 35 is attached to the rear end of the terminal block 12.

  Further, as shown in FIG. 2, the terminal block 12 has a U-shaped standing wall having a plurality of (six in the figure) storage recesses 13 in which the rear end surface and the side surface are open. 14 is formed in the front-rear direction, that is, in a direction orthogonal to the base portion 11. The six storage recesses 13 are provided to store the terminal plate 15, the fastening screw 16, and the washer 17, respectively, and are surrounded by a pair of side walls, a bottom wall, and a back wall, and 3 They are placed one by one so that they are back to back. And the slit-like groove | channels 14a and 14a which both ends of the terminal board 15 can engage and slide are formed in the wall surface of a pair of side wall which each standing wall 14 which forms the storage recessed part 13 mutually faces, and it is a terminal to the opening end side. It is formed to be inclined so as to be located inside the base portion 12. Further, a groove 14c (see FIG. 1) in which an end portion (rear end) of the terminal plate 15 engages is also formed in the bottom wall that constitutes the housing recess 13.

  FIG. 1 shows a state in which the terminal plate 15 is inserted into the housing recess 13 along the grooves 14a and 14a. The terminal plate 15 is provided with a screw hole into which the tightening screw 16 can be screwed. In the present embodiment, a tightening screw 16 having a neck portion thinner than the outer shape of the screw portion in the vicinity of the head and having a washer 17 inserted into the neck portion is used. Such a screw with a washer is provided as a general-purpose product and can be easily obtained, so an increase in cost can be avoided. In this embodiment, in a state where the screw hole of the terminal plate 15 is lightly screwed to the screw portion of the fastening screw 16 with the washer (hereinafter, this state is referred to as a terminal screw set), the terminal plate 15 is formed in the groove 14a. It is inserted into the storage recess 13 by sliding along. When the wiring is connected to the terminal screw set inserted in the housing recess 13, the tightening screw 16 is tightened by the driver 60 with the end portion of the core wire 41 of the wiring 40 being inserted between the washer 17 and the terminal plate 15. When the screw is turned and screwed, the core wire 41 can be firmly held by the washer 17 and the terminal plate 15 to achieve electrical connection.

  A protrusion 15a is provided at the tip of the terminal board 15 so as to protrude from the storage recess 13. The protrusion 15a passes through an engagement hole provided in the printed circuit board 35, and the tip is not shown. However, it functions as a connection part welded to the wiring or lead wire on the printed circuit board 35 by soldering or the like. Thereby, electrical connection between the terminal board 15 and the electronic components on the printed circuit board 35 is made. Further, the protrusion 15a is bent once so that its base portion forms an acute angle with respect to the main body portion, and further, the distal end side thereof is bent at a substantially right angle in a direction opposite to the above, that is, a direction away from the main body portion. Furthermore, the base portion of the protrusion 15a is curved so that the width, that is, the cross-sectional area becomes smaller toward the tip side. This makes it difficult to break the protrusion 15a when bending is performed or when a load is applied to the tip of the protrusion 15a. Further, the engagement hole of the protrusion 15a provided on the printed board 35 functions as a positioning portion when the printed board 35 is attached to the rear end surface of the terminal base 12 so as to cover the terminal screw assembly insertion side opening end. Can do.

  In the terminal block of this embodiment, as described above, the inclined groove 14a is formed so as to be located on the inner side toward the upper end side, and the terminal plate 15 is inserted along the groove 14a. As shown in FIG. 4, the terminal screw set is held in the housing recess 13 with the terminal plate 15 inclined. In addition, at this time, the terminal plate 15 is maintained in a posture inclined outward. As a result, the tightening screw 16 screwed into the terminal plate 15 also has a head portion in which a cross groove that engages with the driver 60 is formed outward. It can be operated with the driver tilted in a direction that is more open than the parallel plane (the direction in which the driver's handle is away from the mounting plate 20). There is an advantage that workability is improved due to difficulty in carrying out.

  Further, since the terminal plate 15 is inclined outward, when the end portion of the wiring to be connected is inserted between the washer 17 and the terminal plate 15, the tip of the wiring first comes into contact with the terminal plate 15, and thereafter Since the terminal board 15 enters while sliding along the surface of the terminal board 15, the terminal board 15 can function as a guide member for guiding the tip of the wiring, and there is also an advantage that workability is improved in this respect.

  Further, in the present embodiment, a device for facilitating the work of assembling the terminal screw assembly into the storage recess 13 of the terminal block 12 and screwing into the terminal plate 15 stored in the storage recess 13 When the tightened screw 16 is loosened too much, a measure is taken to make it difficult for the tightening screw 16 to fall out of the storage recess 13. Hereinafter, the devised configuration will be described.

  In the terminal block (see FIG. 8) of the transmitter before the development of the present embodiment, a through hole that is larger than the diameter of the screw portion of the tightening screw 16 and smaller than the diameter of the head portion of the tightening screw 16 is provided in the terminal plate 15. When the terminal plate 15 and the tightening screw 16 are inserted into the storage recess 13, the tightening screw 16 is inserted into the through hole of the terminal plate 15, and a rectangular square nut 18 is screwed to the tip side. In order to prevent falling off, it is necessary to store in the storage recess 13 with the tip of the screw crimped and integrated.

  Although not shown in FIG. 8, a spring washer is interposed between the head of the tightening screw 16 and the terminal plate 15 to prevent loosening. In addition, in the terminal block of the structure of FIG. 8, the rectangular-shaped square nut 18 is used because a nut with a shape close to a circle cannot hold the nut in a state of being inserted into the storage recess 13. This is to prevent the nut from spinning around when the tightening screw is turned and not being tightened. When the square nut is used as described above, the two sides of the square nut 18 are parallel to the direction of the both side ends of the terminal plate 15 when the square nut is housed in the housing recess 13 formed of a parallel wall. If not, the corners of the corner nuts become obstructive and difficult to insert, and workability is reduced.

  Therefore, as shown in FIG. 5, a dedicated jig provided with a plurality of recesses 71 of a three-stage structure in which a square nut 18 and a terminal plate 15 can be placed and a tip of a tightening screw can be loosely fitted in the center. Prepare 70. Then, with the square nut 18 and the terminal plate 15 placed in order on the jig 70, the fastening screw 16 is inserted into the through hole of the terminal plate 15, and the square nut 18 does not rotate freely by turning the screw. After tightening the square nut 18 to the extent that both ends of the terminal plate 15 and the two sides of the square nut are assembled, the screw ends are crimped and inserted into the receiving recess 13 of the terminal base 12. There was a need to do. That is, the two opposite sides of the terminal plate 15 and the two opposite sides of the square nut need to be parallel to the insertion direction of the terminal screw set.

  As described above, the terminal block having the configuration shown in FIG. 8 has a dedicated jig for performing caulking to prevent the screws from falling off and for facilitating insertion of the terminal plate 15 and the square nut 18 into the housing recess 13. 70 was required to be assembled. In addition, when the assembled terminal block assembly (clamping screw 16, terminal plate 15 and square nut 18) is inserted into the storage recess 13, the direction (posture) for insertion is determined. An insertion jig 80 provided with an engaging portion 81 for holding the tightening screw 16, the terminal plate 15 and the square nut 18 assembled at the tip as shown in FIG.

  Therefore, the terminal block having the configuration shown in FIG. 8 is very troublesome to assemble, and has many devices and tools used for advancing the operation, resulting in an increase in cost. Furthermore, when the construction worker connects the one end of the wiring to the terminal block at the installation site, it is necessary to first loosen the screw, resulting in a reduction in work efficiency. 6 is made of synthetic resin, and when the terminal plate 15 is not sufficiently inserted at the rear end due to the resistance of the groove 14a provided in the standing wall 14, A metal rod 82 is provided that is used to push it in. The jig 80 can improve retention by embedding a magnet behind the engaging portion 81.

  On the other hand, as shown in FIG. 2, parallel ribs 13 a and 13 a projecting inward of the storage recess 13 along the edge of the opening on the side surface of the storage recess 13 are provided on the terminal block 12 of the present embodiment. Is formed. The distance between the ribs and the end surface of the rib is designed to be wider than the diameter of the head of the tightening screw 16 and narrower than the width of the washer 17. In other words, the width of the washer 17 is designed to be slightly smaller than the width of the housing recess 13, and the distance between the front end surfaces of the ribs 13 a and 13 a is narrower than the width of the washer 17.

  As a result, when the tightening screw 16 inserted in the storage recess 13 is turned in the loosening direction, the screw 16 and the washer 17 fitted thereto are moved to the opening side where the rib is provided. The washer 17 is caught on the ribs 13a and 13a so as not to fall off. In addition, the washer 17 is inserted into a neck portion having a diameter smaller than the outer diameter of the screw portion of the tightening screw 16, and the hole of the washer 17 is smaller than the outer diameter of the screw portion, so that the washer 17 is caught by the screw portion. This also prevents the tightening screw 16 from falling off. Further, the length of the tightening screw 16 and the position of the groove 14a are designed so that the screw portion of the tightening screw 16 does not come out of the screw hole of the terminal plate 15 in a state where the washer 17 is in contact with the ribs 13a and 13a. As a result, it is possible to prevent the tightening screw 16 from coming off. Therefore, the terminal block to which the present embodiment is applied has an advantage that it is not necessary to caulk the tip of the fastening screw 16.

  In the present embodiment, the tightening screw 16 has a neck portion whose diameter is smaller than the outer diameter of the threaded portion and the washer 17 is inserted into the neck portion. Even if the diameter of the screw insertion hole formed is larger than the outer diameter of the screw portion of the tightening screw 16, that is, the washer 17 comes out of the tightening screw 16, it is formed on the washer 17. If the diameter of the screw insertion hole is designed to be slightly larger than the outer diameter of the screw portion of the tightening screw 16, an effect close to that of the present embodiment can be obtained. The reason is that even if the tightening screw 16 is loosened too much and the screw part is removed from the screw hole provided in the terminal plate 15 and the screw 16 and the washer 17 inserted into the screw 16 are shifted outward, the washer 17 is first moved. This is because it is prevented from being caught by the ribs 13a and 13a, and further, the tightening screw 16 being inclined and the screw part being caught in the hole of the washer 17 and falling off.

  On the other hand, when the tightening screw 16 has a neck portion whose diameter is smaller than the outer diameter of the screw portion and the washer 17 is inserted into the neck portion as in this embodiment, the screw is loosened. When the washer 17 moves, the distance between the washer 17 and the terminal plate 15 becomes sufficiently wide so that the end of the wiring can be easily inserted, and the wiring between the head of the tightening screw 16 and the washer 17 is mistakenly made. It is possible to avoid the occurrence of a situation in which sufficient contact cannot be obtained due to the end portion of the electrode being sandwiched. Moreover, since an operator avoids such a situation, the effort which resets the edge part of wiring many times can be reduced, and the work efficiency on the spot can be improved.

  By the way, considering the above-described function of preventing falling off, the washer 17 does not necessarily have to be rectangular (square), and may be circular. Since the washer 17 has a circular shape, it is not necessary to consider the posture of the washer 17, so that the terminal plate 15 is inserted into the housing recess 13 in a state in which the terminal plate 15 is lightly engaged with the tip without tightening the screw. A clamping screw 16 and a washer 17 can be inserted. That is, there is an advantage that it is not necessary to use a dedicated jig 70 as shown in FIG. 5 or an insertion jig 80 as shown in FIG.

  Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment shown in FIG. 3 is an embodiment effective when a square washer is used as the washer 17 that is inserted into the fastening screw 16. In this embodiment, a relief taper portion 14b is provided at the end of one of the parallel upstanding walls 14 on the terminal board insertion side.

  In this way, when the escape taper portion 14b is provided on one of the standing walls 14, the terminal plate 15 is first inserted along the groove 14a, so that the insertion direction of the terminal screw set is determined. Even if the washer 17 inserted through the screw 16 is inserted in a posture in which the outer side is not parallel to the wall surface of the standing wall 14 constituting the storage recess 13 as shown in FIG. When the washer 17 rotates with the tip corner of the standing wall on the side without the taper as a fulcrum, and the two sides of the washer 17 become parallel to the wall surface of the standing wall 14, the storing recesses along the standing wall 14 as they are. 13 can enter. Therefore, in the second embodiment, even when a square washer is used, it is not necessary to use a dedicated jig as shown in FIG. 5 or an insertion jig as shown in FIG.

  Incidentally, as described above, when a round washer is used as the washer 17, it is not necessary to consider the posture of the washer. Therefore, the terminal screw assembly can be provided without providing the above-described relief taper portion 14b on the standing wall 14. Can be easily inserted into the storage recess 13. However, there may be a case where two wires are desired to be connected to one terminal board 15 depending on the use of the terminal block, such as a transmitter terminal block assumed to be applied in the present embodiment. In such a case, if a round washer is used, the contact area and the contact pressure may not be sufficiently obtained as compared to a square washer. Therefore, it is desirable to use a square washer. Further, by providing the relief taper portion 14b at the terminal screw assembly insertion side opening end of the standing wall 14, there is an advantage that the square washer can be easily inserted into the storage recess 13.

  The second embodiment can also be applied to a combination of a conventional terminal plate 15 and a fastening screw 16 using a rectangular square nut 18. FIG. 4 shows the configuration of such an application. The difference from FIG. 3 is that a relief taper portion 14 b is provided on the back side of the terminal plate 15 in the terminal block of FIG. 4. As described above, when the relief taper portion 14b is provided on one of the standing walls 14 on the back side of the terminal plate 15, the washer 17 and the terminal plate 15 are inserted into the tightening screw 16, and the square nut 18 is lightly attached to the tip of the screw. When inserted into the housing recess 13 without being screwed and screwed, as in FIG. 3 (B), first, one side of the square nut 18 is placed at the tip corner of the standing wall on the side without the taper. When the two sides of the square nut 18 become parallel to the wall surface of the standing wall 14, they can enter the storage recess 13 as they are along the standing wall 14.

  Therefore, in the case of this modification, it is convenient if there is a jig 70 as shown in FIG. 5, but it is not essential because it is not necessary to determine the posture of the square nut 18, and for insertion as shown in FIG. The jig 80 is also unnecessary. Also, since the terminal screw assembly is inserted into the terminal block without tightening the screws, the process of loosening the screws is omitted when the construction worker connects one end of the wiring to the terminal at the installation site. There is an advantage that the working efficiency can be improved as compared with the terminal block not provided with the relief taper portion 14b. Furthermore, even if the operator loosens the screw at the installation location, the rib 13a is provided so that there is no risk of the screw falling off, so that the process of caulking the tip of the screw can be omitted, thereby reducing the cost. There is an advantage that down can be achieved.

  Although the invention made by the present inventor has been specifically described based on the embodiment, the present invention is not limited to the embodiment. For example, in the above embodiment, the description has been given of the case where six storage recesses into which a terminal screw set can be inserted are provided in one terminal block. However, the number of storage recesses is not limited to six, and may be any number. Can do. In addition, the pair of upstanding walls 14 that face each other need not be parallel, and may be inclined so that, for example, the gap becomes wider toward the terminal board insertion side. Furthermore, in the said embodiment, although a pair of standing wall 14 is made the same height, you may make one standing wall lower than the other standing wall. In this case, the square washer is brought into contact with the higher standing wall, and a height difference is provided on the standing wall so that the square washer can rotate in the space at the upper end of the lower standing wall. Further, it is more preferable to form a taper portion for escape on the lower standing wall.

  Further, in the first embodiment, the screw hole into which the tightening screw 16 is screwed is shown in the terminal plate 15 itself. However, the female screw member in which the screw hole is formed is fitted into the terminal plate 15. It may be configured. Furthermore, in the said embodiment, although the ribs 13a and 13a which continued along the standing wall edge part by the side of the opening of a storage recessed part are formed, the rib 13a does not need to be continuous and is like a rack gearwheel. It may be composed of a plurality of ribs arranged substantially linearly with a gap. Further, the structure for transmitting the operation of the push button 31 to the sensor (switch) 32 is not limited to the configuration shown in FIG. 1, and any structure may be used.

  Furthermore, in the above description, the case where the invention mainly made by the inventor is applied to the terminal block of the transmitter of the disaster prevention system has been described as an example, but the present invention is not limited to an emergency stop button provided on a station platform or a railroad crossing. Such as an emergency stop button provided on an escalator, it can be widely used for a terminal block of a transmitter for operating and sending a signal when an abnormality occurs.

DESCRIPTION OF SYMBOLS 10 Terminal block 11 Base part 12 Terminal block part 13 Storage recessed part 13a Rib 14 Standing wall 14a Guide groove 14b Escape taper part 15 Terminal board 15a Protrusion (connection part)
16 Tightening screw 17 Washer 18 Square nut 20 Mounting plate 31 Push button 32 Sensor (switch)
35 Printed circuit board 36 Cover plate 40 Wiring 41 Core wire 60 Driver 70 Jig for assembling terminal screw set 80 Inserting jig 120 Transmitter 130 Alarm lamp

Claims (10)

A terminal plate having a joint surface joined to a wall surface or a board surface, and having a connection portion to which an end portion of the wiring is electrically connected; and a tightening screw screwed into a screw hole provided in the terminal plate; A washer that is inserted into the tightening screw, the washer is inserted into the tightening screw, the terminal plate is screwed into a screw portion of the tightening screw, and the washer is a head of the tightening screw. A terminal block having a storage portion for storing a terminal screw set assembled so as to be positioned between the terminal plate and the terminal plate,
The storage portion has a pair of holding walls that are arranged opposite to each other so as to stand up with respect to the joint surface and hold the terminal plate,
On the inner side of the pair of holding walls, grooves that can be inserted by inclining the terminal plate so that the tightening direction of the tightening screw is directed to the joining surface are formed, respectively.
Ribs for preventing the washer from falling off are formed at the ends of the pair of holding walls in the direction of the fastening screws and on the side where the heads of the fastening screws of the terminal screw set are stored, respectively, When the fastening screw is turned in the loosening direction with the terminal screw set stored in the storage portion and the washer abuts against the rib, the screw portion of the fastening screw comes out of the screw hole of the terminal plate. The terminal block is characterized in that the length of the tightening screw and the position of the groove are set so as not to be present.   The tightening screw has a neck portion having a diameter smaller than the outer diameter of the screw portion in the vicinity of the head portion, and a washer having an insertion hole having a diameter smaller than the outer diameter of the screw portion is inserted into the neck portion. The terminal block according to claim 1.   The terminal block according to claim 1, wherein the washer is a rectangular square washer.   The terminal block according to claim 1, wherein the pair of holding walls are parallel walls provided in parallel to each other. 5. The terminal block according to claim 1, wherein the washer is a rectangular square washer, and the pair of holding walls have an opposing width that restricts rotation of the square washer.   The terminal block according to claim 1, wherein a screw hole into which a screw portion of the tightening screw is screwed is directly formed in the terminal plate.   The storage portion is a storage recess formed in a concave shape and having a back wall and a bottom wall, and the bottom wall is formed with a groove into which an end of the terminal plate can be engaged. The terminal block in any one of Claims 1-6. The terminal block according to claim 7 , wherein a plurality of sets of the storage recesses are provided with the back walls back to back.   The terminal plate is formed with a projection protruding from the terminal screw assembly insertion side end as the connection portion, and the base of the projection has a shape with a smaller cross-sectional area toward the tip side. The terminal block in any one of Claims 1-8. The terminal block according to claim 9, a printed board on which an electronic component is mounted so as to cover an opening end formed at the terminal screw assembly insertion side end of the terminal block, and is held by the terminal block and switches, engage a push button for the switch to the oN state when operated provided corresponding to said switch, said printed circuit board in which the tip of the protrusion of the front SL terminal plate engages A transmitter characterized in that a hole is provided.

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