Transmitter

Abstract

To prevent a component from being damaged even if such a force as further pushing a transmitter downward acts in a state where rotation is limited by opening a front panel in a transmitter comprising a telephone jack.SOLUTION: In a transmitter comprising a transmitter main body part including a storage case, in which a switch is incorporated, and mounted on an installation surface and a front panel part including a push button, the front panel part can be converted between a first state where the front panel part is connected to the storage case by a connection mechanism provided between the front panel part and the storage case and an opening of a front portion is closed and a second state where a portion is opened. The connection mechanism comprises: a slide member which includes a pin shaft in a front end and is provided in the storage case movably in a longitudinal direction; and a connection member which is mounted in a front end of the slide member rotatably by the pin shaft. The connection member is mounted rotatably by the pin shaft of the slide member, and a projection is formed in the vicinity of the pin shaft. An abutment surface part to which the projection is abutted is formed in the connection member, and a wall part is formed at a termination side of the abutment surface part in a rotation direction of the connection member.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an emergency alarm transmitter, and more particularly to a technique that is effective when used in a fire alarm transmitter that is installed on the wall of a building and is operated to issue an alarm in the event of a fire. [Background technology]

[0002] A fire alarm system is installed inside a building to alert people to the occurrence of a fire. The fire alarm system consists of a fire detector, a manual fire alarm transmitter with a push-button switch, a receiver, a fire alarm bell, a signal light, etc., and the fire alarm transmitter is installed at an appropriate height on the wall of a building's corridor, etc. When a fire breaks out, the discoverer presses the push-button switch on the fire alarm transmitter firmly, which transmits a signal to the receiver and sounds an alarm from a bell installed near the transmitter, alerting people in the vicinity.

[0003] Conventional fire alarm transmitters generally have a disk-shaped front panel on the front of the transmitter body that covers the exposed parts of the room. The transmitter body includes a push-button switch, a circuit board that detects when the switch is turned on and generates and sends a signal, and a telephone jack to which a handset is connected to communicate with the fire receiver monitor. The front panel also has a door that covers the front of the telephone jack and can be opened and closed as needed, and the transmitter body is installed so that it is embedded in the wall of a building. In addition, a bullet-shaped indicator light is provided near the fire alarm transmitter to make it easy to find from a distance or in the dark.

[0004] On the other hand, in recent years, flat-type indicator lights with flat or disc-shaped front faces and fire alarm transmitters with integrated indicator lights have also been put to practical use. For example, Patent Document 1 discloses an invention relating to a fire alarm transmitter with integrated indicator lights. The fire alarm transmitter described in Patent Document 1 has an opening / closing door on the front panel of the transmitter that covers the front of the telephone jack, and is configured in such a way that the boundaries between the indicator light on the front and the push button and opening / closing door are clearly visible. On the other hand, in recent years, there has been a growing demand for the design of building interiors, and transmitters with clearly visible boundaries between components have the problem that when installed on the interior walls of a building, they do not harmonize with the interior and create a sense of incongruity.

[0005] Therefore, a transmitter has been proposed that ensures the functionality of allowing the use of a telephone jack from the front of the transmitter while reducing the boundaries between components to blend in with the interior of the building and to prevent discomfort. An example of an invention related to such a transmitter is described in Patent Document 2. The transmitter described in Patent Document 2 is configured so that a front panel equipped with a push button and a light-emitting unit is connected by a link mechanism to the front of a storage case of the transmitter main body, which has a built-in push button switch and telephone jack, and is convertible between a first state in which the front panel closes the front opening of the storage case and a second state in which the front opening of the storage case is open and the telephone jack can be operated from the front. Patent Document 2 also describes an example of a transmitter in which the front opening can be opened by sliding and tilting the front panel forward. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2020-144951 [Patent Document 2] Japanese Patent Application Laid-Open No. 2023-64395 Summary of the Invention [Problem to be solved by the invention]

[0007] However, it was found that with the transmitter described in Patent Document 2, when the front panel is slid forward and tilted, restricting rotation, and a force is applied that pushes it further downward, there is a risk that part of the sliding member or connecting member that makes up the connecting mechanism may be damaged. The present invention was made with an eye on the above-mentioned problems, and its purpose is to prevent damage to the components that make up the connecting mechanism in a transmitter that has a telephone jack inside and a front panel with a push button on the front, even if a force pushing further downward is applied when the front panel is opened to restrict rotation in order to use the telephone jack from the front of the transmitter. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides: A transmitter comprising: a transmitter body portion having a storage case with an opening at the front and a built-in switch that can be turned on and off, and attached to an installation surface; and a front panel portion having a push button for operating the switch, a telephone jack is provided on the transmitter body so as to face the opening of the storage case; The front panel portion includes: A connecting mechanism interposed between the front panel and the storage case is configured to be convertible between a first state in which the opening of the storage case is closed and a second state in which at least a part of the opening of the storage case is open and the telephone jack can be operated from the front, the connecting mechanism includes a slide member having a pin shaft at a front end portion thereof and provided on the storage case so as to be movable in the front-rear direction, and a connecting member attached to the front end of the slide member so as to be rotatable by the pin shaft; the connecting member is rotatably attached to the pin shaft of the sliding member, and a protrusion is provided near the pin shaft of the sliding member; The connecting member is configured so that a contact surface portion against which the protrusion abuts is formed at the portion facing the protrusion, and a wall portion is formed at the end of the contact surface portion in the rotation direction of the connecting member.

[0009] According to the above configuration, in a transmitter having a transmitter main body section with a switch and telephone jack inside and a front panel section with a push button, when the front panel is opened from the front of the transmitter to use the telephone jack and rotation is restricted, and a force is applied that pushes it further downward, the protrusion provided near the rotation axis overcomes the wall section provided to prevent rotation, causing the connecting member to detach from the front end of the sliding member, thereby preventing damage to the members that make up the connecting mechanism. Furthermore, since a sliding member is provided on the storage case so as to be movable in the forward and backward directions and the connecting member is attached to the front end of the sliding member, the front panel can be moved forward by the sliding member after the connection between the front panel and the storage case is released, thereby widening the front of the transmitter main body and facilitating access to the telephone jack. Furthermore, since the front panel moves while remaining connected to the sliding member, it is possible to prevent the opened front panel from being removed and lost.

[0010] Preferably, a notch is formed in the front end of the slide member, and the pin shafts are provided on inner surfaces of the notches facing each other, The connecting member is provided with a pair of angle members each having a bearing hole into which the pin shaft is fitted and extending in a direction away from the center of the front panel portion at a predetermined interval, The pair of angle members are each provided with the abutment surface portion, The contact surfaces are configured to be tapered so as to approach each other as they extend from the bearing hole toward the tip end.

[0011] According to the above-described configuration, when assembling the connecting member to the slide member, the end face of the pin shaft is moved along the tapered portion and the connecting member is pushed in, whereby the angle member elastically deforms, allowing the bearing hole to be easily fitted onto the pin shaft. Preferably, the projection has a hemispherical head. [Effects of the Invention]

[0012] According to the present invention, in a transmitter having a telephone jack inside and a front panel with a push button on the front, when the front panel is opened to use the telephone jack from the front of the transmitter and rotation is restricted, even if a force pushing further downward is applied, the components that make up the connecting mechanism will not be damaged. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an overall perspective view showing an embodiment in which the present invention is applied to a fire alarm transmitter. [Figure 2] FIG. 2 is a cross-sectional perspective view showing the internal structure of the transmitter of the embodiment in FIG. [Figure 3] 2 is a perspective view showing an embodiment of a connecting mechanism that connects the front panel of the transmitter of the embodiment in FIG. 1 to the storage case. FIG. [Figure 4] 4 is an enlarged perspective view showing details of a connecting member that constitutes the connecting mechanism of the embodiment of FIG. 3. FIG. [Figure 5] 2 is a perspective view showing an embodiment of the rear structure of the front panel of the transmitter of the embodiment in FIG. 1 and an embodiment of the connecting member. [Figure 6] 1A and 1B show details of a connecting mechanism consisting of a connecting member and a sliding member, with FIG. 1A being an enlarged perspective view and FIG. 1B being a rear view. [Figure 7] 2A is a perspective view showing the front panel and transmitter body of the transmitter shown in FIG. 1, and FIG. 2B is an enlarged view showing a specific example of a coupling means consisting of an engaging claw and a claw receiver. [Figure 8] 2A to 2D are diagrams showing the procedure for opening the front panel of the transmitter of the embodiment of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a fire alarm transmitter to which the present invention is applied will be described with reference to the drawings. The fire alarm transmitter of this embodiment (hereinafter simply referred to as the transmitter) has the function of sending a signal to a fire receiver notifying the occurrence of an abnormality when an abnormality such as a fire occurs by firmly pressing the push button on the front to turn on an internal switch, and is configured to be installed and used on the wall of a building or the door of a fire hydrant box.

[0015] FIG. 1 is an overall perspective view of a transmitter according to one embodiment of the present invention, and FIG. 2 is a cross-sectional perspective view showing the internal structure of the transmitter shown in FIG. 1 with the front panel moved forward. As shown in FIG. 1, the transmitter 10 of this embodiment is composed of a transmitter main body 10 having a box-shaped storage case 13 with an opening at the front and a push button switch inside, and a disk-shaped front panel 20 connected to the front of the transmitter main body 10, which has a push button (external protective plate) 21 that protects the push button switch located inside the center of the outer surface and has a light-emitting section 22 around it that functions as a position indicator light.

[0016] As shown in Figure 2, the transmitter main body 10 is provided with a box-shaped storage case 13 that houses a push button switch 11 and a telephone jack 12 into which the plug at the end of the handset cord is inserted. A disk-shaped inner protective plate 14 is disposed in front of the push button switch 11 (to the left in the figure) inside the storage case 13 so that it can move back and forth, and a compression spring 15 is disposed on the back of the inner protective plate 14 to urge the inner protective plate 14 forward. A circuit board 16 that detects when the push button switch 11 is turned on and sends a signal to the outside is also provided inside the storage case 13. The transmitter main body 10 is attached to the storage case 13 so that the flange 13a at the front end thereof is joined to the installation surface.

[0017] Meanwhile, front panel 20 includes a disk-shaped base 22A joined to cover the outer opening of storage case 13, a light guide plate 22B joined to the outer surface of base 22A, and a cover member 22C joined to the outer surface of light guide plate 22B. A push button 21 is disposed in the center of front panel 20 as an outer protective plate that protects push button switch 11, and a rod portion 21a that protrudes inward is formed on the back surface of push button 21.

[0018] In addition, the base 22A of the front panel portion 20 has a mortar-shaped portion 22b with a double-cylindrical engagement portion 22a with a U-shaped cross section on the inner end side, and further has a circular disk-shaped outer flat portion 22c around it, and a short cylindrical eave portion 22d bent inward is formed on the periphery of the outer flat portion 22c. A holding member 25 is disposed on the back of the main body plate 22A, and a cylindrical portion 25a protruding outward and inward is provided at the center of this holding member 25, and the pressing rod portion 21a formed on the back of the push button 21 is inserted into this cylindrical portion 25a, so that the rear end of the rod portion 21a can abut against the front surface of the inner protective plate 14. Furthermore, a cylindrical engaging wall 25d is provided on the periphery of the front surface of the holding member 25, which engages with the cylindrical engaging portion 22a of the main body plate 22A.

[0019] Furthermore, an LED substrate 24 on which a plurality of light-emitting elements (LEDs: light-emitting diodes) 23 functioning as a light source are mounted with their emission portions facing outward is disposed on the front surface of the holding member 25. The push button 21 and the light guide plate 22B and cover member 22C of the light-emitting portion 22 are formed of a light-transmitting light-guiding material such as acrylic resin, and are configured to guide light from the light-emitting elements 23 mounted on the LED substrate 24 and emit it to the front surface to provide a light-emitting display.

[0020] Furthermore, a slide plate 26 that slides along the upper surface of the bottom wall 13b is provided at the bottom of the storage case 13. Specifically, a rib-shaped guide rail is provided parallel to the bottom wall 13b at the bottom of the inner surface of the side wall of the storage case 13, and the side end of the slide plate 26 engages with a guide groove formed by this guide rail and the bottom wall of the storage case 13, allowing it to move back and forth while remaining in a horizontal position. As shown in FIG. 3, steps 26a are formed on both sides of the rear end of the slide plate 26, and a stopper piece 17 is provided on the bottom wall 13b of the storage case 13 to interfere with the steps 26a and prevent the slide plate 26 from moving forward, and this stopper piece 17 functions as a retaining means for preventing the slide plate 26 from coming off.

[0021] A ring-shaped connecting member 27 for connecting the slide plate 26 to the base 22A is attached to the front end of the slide plate 26 so as to be tiltable around its lower end as the center of rotation. Specifically, as shown in Fig. 3, a notch 26b is formed in the front end of slide plate 26, and a pair of angles 27g that engage with notch 26b of slide plate 26 is provided at the lower end of connecting member 27. Also, a pair of pin shafts 26c are provided at the front end of slide plate 26, corresponding to the pair of angles 27g, with their ends slightly protruding inside notch 26b, and hemispherical protrusions 26d are formed on the inner surface of notch 26b near pin shafts 26c. Note that only one of the pair of pin shafts 26c and protrusions 26d is visible in Fig. 3.

[0022] 4, the pair of angles 27g of the connecting member 27 are formed with bearing holes 27h into which the pin shafts 26c can be fitted, and are also formed with tapered portions 27i that are inclined downward so that the thickness decreases from the bearing holes 27h toward the tip. When the pin shafts 26c are fitted into the bearing holes 27h and the angles 27g of the connecting member 27 are engaged with the notches 26b of the slide plate 26, the protrusions 26d of the slide plate 26 abut against the tapered portions 27i. Wall portions 27j are formed on both sides of the tapered portions 27i.

[0023] As a result, when connecting member 27 is rotated vertically around pin shaft 26c, protrusion 26d can move within a predetermined range without contacting the surface of tapered portion 27i. When connecting member 27 is rotated downward from a vertical position by a predetermined angle, rotation-preventing piece 27k abuts against the lower front end of slide plate 26, and protrusion 26d abuts against wall portion 27j, preventing the rotation of connecting member 27. However, when a force is applied to connecting member 27 in a direction that rotates it downward from that state, protrusion 26d elastically deforms angle 27g and moves over wall portion 27j. This disengages connecting member 27 from slide plate 26, separating connecting member 27 from slide plate 26 and disengaging front panel portion 20 from the front surface of storage case 10.

[0024] Even if front panel 20 comes off from the front surface of storage case 10, front panel 20 can be easily attached to the front surface of storage case 10 and returned to its original state by fitting pin shaft 26c at the front end of slide plate 26 into bearing hole 27h of angle 27g. Furthermore, since the portion with which protrusion 26d abuts is tapered portion 27i, when assembling connecting member 27 to slide plate 26, the end face of pin shaft 26c moves along tapered portion 27i to push connecting member 27, thereby elastically deforming angle 27g and fitting pin shaft 26c into bearing hole 27h. Furthermore, wall portions 27j on both sides of tapered portion 27i function as guide walls that guide pin shaft 26c, making it easy to fit pin shaft 26c into bearing hole 27h.

[0025] Next, the joining structure between the connecting member 27 and the base 22A of the front panel unit 20 will be described with reference to Figures 5 and 6. Figure 5 shows the back surface of the front panel unit 20 and the connecting member 27 in detail when removed from the main body unit. 5, a cylindrical rib 25b is provided on the back surface of the holding member 25 fitted into the central opening of the base 22A constituting the front panel section 20, and a pair of claws 25c are formed outward from the rib 25b. The claws 25c are formed so as to have a gap between them and the back surface of the holding member 25. The gap is approximately the same size as the thickness of a claw receiver 27c, which will be described later.

[0026] Meanwhile, the connecting member 27 has a circular opening 27a through which the cylindrical portion 25a on the back surface of the front panel portion 20 is inserted, and a pair of notches 27b into which the pair of claws 25c can be inserted is formed at the edge of the opening 27a. A pair of claw receivers 27c are provided near the edge of the opening 27a and the notches 27b. A tapered, wedge-shaped step portion 27d is formed at the end of the claw receivers 27c on the notch 27b side. The relationship between the claws 25c and the claw receivers 27c may be reversed from that described above, i.e., the claws may be provided on the connecting member 27 and the claw receivers on the base 22A of the front panel portion 20.

[0027] According to the above-described connection structure, with the pair of claws 22g of base 22A aligned with the pair of notches 27b on the connecting member 27, front panel unit 20 is moved toward connecting member 27, and ring-shaped rib 22f is inserted into opening 27a of connecting member 27. Then, front panel unit 20 is slightly rotated in the direction of arrow A in FIG. 6A, the pair of claws 25c of the base 22A engage with the claw receivers 27c of the connecting member 27, and the front panel section 20 is joined to the connecting member 27 and integrated with it.

[0028] As shown in FIG. 6B, the claw receiver 27c has a slit 27e formed along the boundary between the cutout 27b and the inner surface of the peripheral wall, allowing the claw receiver 27c to easily deform elastically. Furthermore, on the side of the claw receiver 27c farther from the notch 27b, a wall 27f for a rotation stopper is provided at a position that allows a margin of an angle for rotating the front panel unit 20 from a predetermined posture in order to release the connection between the front panel unit 20 and the transmitter main body unit 10.

[0029] Furthermore, when front panel unit 20 is rotated in the direction of arrow A, claw receiver 27c elastically deforms, and claw 25c of base 22A climbs over step portion 27d at the end of claw receiver 27c of connecting member 27, thereby preventing movement in the opposite direction and making it difficult to remove front panel unit 20. At this time, because step portion 27d at the end of claw receiver 27c is tapered, claw 25c can easily climb over step portion 27d of claw receiver 27c, and once it has climbed over step portion 27d, it becomes difficult for claw 25c to move in the opposite direction.

[0030] On the other hand, to remove the front panel unit 20 from the connecting member 27 from the state shown in FIG. 6(A), the front panel unit 20 is rotated in the direction of arrow B in FIG. 5 with a little strong force, in the opposite direction to the above. Then, the pair of claws 25c of base 22A disengage from claw receivers 27c of connecting member 27, and claws 25c align with notches 27b, allowing front panel unit 20 to be moved forward and disengaging from connecting member 27. Incidentally, the operation of detaching front panel unit 20 from connecting member 27 is performed with front panel unit 20 moved forward.

[0031] Next, the joining structure between the front panel section 20 and the transmitter body section 10 will be described with reference to Fig. 7. Note that in Fig. 7, the connecting member 27 is not shown. 7(A), a pair of inverted L-shaped locking claws 22h are provided on the back surface of base 22A constituting front panel 20 at positions facing each other across cylindrical rib 25b on the back surface of holding member 25. Furthermore, a pair of claw receivers 13c are provided at positions corresponding to the pair of locking claws 22h on the front surface of flange 13a of storage case 13 constituting transmitter main body 10, and guide holes 13d are formed to guide locking claws 22h. Note that if the height of claw receivers 13c is greater than the thickness of the heads of locking claws 22h, guide holes 13d may be omitted.

[0032] FIG. 7(B) shows the relationship between the locking claw 22h and the claw receiver 13c. As shown by the solid line in Fig. 7(B), the head of the locking claw 22h is inserted into the guide hole 13d at the tip side of the claw receiver 13c, and then the front panel unit 20 is rotated to move in the direction of arrow C. Then, as shown by the dashed line in Fig. 7(B), the head of the locking claw 22h enters between the claw receiver 13c and the flange portion 13a of the storage case 13. This connects the front panel unit 20 to the transmitter main body unit 10. Note that the relationship between the claw and the claw receiver may be reversed from that described above, i.e., the locking claw may be provided on the flange portion 13a of the storage case 13, and the claw receiver may be provided on the base 22A of the front panel unit 20.

[0033] Furthermore, a trapezoidal stepped portion 13e is provided on the inner surface of the claw receiver 13c, and when the head of the locking claw 22h overcomes this stepped portion 13e while elastically deforming the claw receiver 13c, the tip of the claw receiver 13c returns to its original position, and the stepped portion 13e acts to suppress movement of the locking claw 22h in the opposite direction. At this time, because the stepped portion 13e is trapezoidal, if a little force is applied to turn the front panel unit 20 in the opposite direction, the head of the locking claw 22h overcomes the stepped portion 13e of the claw receiver 13c, and the connection between the front panel unit 20 and the transmitter main body unit 10 is released. Then, when the front panel unit 20 is pulled toward you in this state, the slide plate 26 moves forward, and the front surface of the transmitter main body unit 10 is released.

[0034] Furthermore, in the transmitter of this embodiment, the orientations of tab receivers 13c and 27c are set so that the direction in which front panel 20 is rotated to couple front panel 20 to transmitter main body 10 is opposite to the direction in which front panel 20 is rotated to couple front panel 20 to coupling member 27 using the structure described in Fig. 5. This prevents the front panel 20 from accidentally becoming disconnected from coupling member 27 when front panel 20 is rotated to release the coupling between front panel 20 and transmitter main body 10.

[0035] For example, in the installation state shown in FIG. 8(A) where the front panel 20 is connected to the transmitter main body 10, rotating the front panel 20 counterclockwise as shown in FIG. 8(B) releases the connection between the locking tab 22h and the tab receiver 13c. Then, pulling the entire front panel 20 toward you causes the front panel 20 to move forward, widening the gap between it and the transmitter main body 10, as shown in FIG. 8(C). Next, pulling the upper part of the front panel 20 toward you causes the front panel 20 to tilt, as shown in FIG. 8(D), freeing the front of the transmitter main body 10. This exposes the telephone jack 12, allowing a handset to be plugged in from the front. The original installation state can be restored by operating the front panel 20 in the reverse order of the above.

[0036] As described above, the transmitter of this embodiment is configured so that the front of the transmitter main body 10 can be opened by rotating the front panel 20. Therefore, as long as one knows the operating procedure, anyone can easily operate the front panel to open or close the storage case without requiring any special skills, and there is an advantage that there is no risk of the tabs being damaged by the large force applied to them when the front panel 20 is rotated. Furthermore, the front panel section 20 can be completely removed from the transmitter body section 10, which has the advantage of facilitating handling during maintenance.

[0037] Furthermore, the transmitter of this embodiment does not require a door on the front panel 20 to cover the front of the telephone jack 12, so the number of components on the front and the boundaries between the components are reduced, making the boundaries less noticeable. Also, the entire front of the push button 21 and the light emitting portion 22 serves as a light emitting surface and emits light, so the boundary between the push button 21 and the light emitting portion 22 is less noticeable. Therefore, it blends in with the interior of the building, is less likely to feel out of place, and improves the aesthetics, and because no door is required, even if the transmitter is made smaller, the light-emitting section 22 can be made relatively large, preventing a decrease in visibility due to a smaller light-emitting display area. Also, because there is no door, even if the entire transmitter is small, the push button 21 can be made relatively large, improving operability.

[0038] Although the above description has been given of the case where the locking claw 22h and the claw receiver 13c are used only as a means for connecting the front panel portion 20 and the transmitter main body portion 10, the present invention is not limited to this. For example, the front panel 20 incorporates a light-emitting element (LED) 23 that causes the light-emitting portion 22 to emit light. Therefore, in order to supply power to the LED, it is necessary to extend a power supply wire between the storage case 13 and the front panel 20. However, supplying power to the front panel 20 via a wire poses the problem that the front panel 20 cannot be completely removed from the transmitter main body 10.

[0039] Therefore, the locking claws 22h and the claw receivers 13c are formed of a conductive material, and the locking claws 22h are connected to the LED board 24 disposed inside the front panel portion 20 by lead wires or the like. Also, the circuit board 16 disposed in the storage case 13 is connected to the claw receivers 13c by lead wires or the like. As a result, when the claw receivers 13c of the storage case 13 and the locking claws 22h of the front panel 20 engage with each other, power can be supplied to the LED board 24.

[0040] Although the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments. For example, in the above examples, the head of the protrusion 26d is formed to be hemispherical, but the tapered portion (contact surface portion) 27i may be formed to have an inclined surface on the side facing the step portion 27j on the rotational end side of the connecting member. Alternatively, the protrusion 26d may be formed in a columnar shape, and the step portion 27j on the rotational end side of the connecting member may have an inclined surface.

[0041] In the above embodiment, the front panel 20 and the storage case 13 of the transmitter main body 10 are connected by engagement between the tabs and the tab receivers, but magnets may be provided instead of tabs to connect them. Also, in the above embodiment, the front panel 20 is moved forward using the slide plate 26, but a link mechanism with a separate structure may be provided to allow the front panel 20 to move forward. Furthermore, in the above embodiment, the present invention has been described as being applied to a fire alarm transmitter that constitutes a fire alarm system, but the present invention is not limited to fire alarm transmitters and can be widely used in transmitters for emergency train stops that are installed on station platforms or at railroad crossings, etc. [Explanation of symbols]

[0042] 10 Transmitter main body 11 Push-button switch 12. Telephone Jack 13 Storage case 13a Flange 13b Bottom wall 13c Claw holder 13d Guide hole 13e Step 14 Inner protection plate 15 compression spring 16 Circuit Board 20 Front panel 21 Push Button 22 Light emitting part 22A base 22B Light guide plate 22C Cover material 22a Cylindrical engagement part 22b Funnel-shaped part 22c Outer flat area 22d Eaves 22h Locking claw 23 Light-emitting element (LED) 24 LED boards 25 Retaining member 25a Cylindrical part 25b Cylindrical rib 25c claw 25d Cylindrical engagement wall 26 Slide plate (slide member) 26a Step 26b Notch 26c pin shaft 26d protrusion 27 Connecting member 27a aperture 27b Notch 27c Claw holder 27g angle 27h bearing hole 27i Tapered part (contact surface part) 27j wall 27k rotation prevention piece

Claims

1. A transmitter comprising: a transmitter body portion having a storage case with an opening at the front and a built-in switch that can be turned on and off, and attached to an installation surface; and a front panel portion having a push button for activating the switch, a telephone jack is provided on the transmitter body so as to face the opening of the storage case; The front panel portion includes: a connecting mechanism interposed between the front panel portion and the storage case, configured to be convertible between a first state in which the opening of the storage case is closed and a second state in which at least a part of the opening of the storage case is open and the telephone jack can be operated from the front, the connecting mechanism includes a slide member having a pin shaft at a front end portion thereof and provided on the storage case so as to be movable in the front-rear direction, and a connecting member attached to the front end of the slide member so as to be rotatable by the pin shaft; the connecting member is rotatably attached to the pin shaft of the sliding member, and a protrusion is provided near the pin shaft of the sliding member; A transmitter characterized in that a contact surface portion against which the protrusion abuts is formed at a portion of the connecting member facing the protrusion, and a wall portion is formed at the end of the contact surface portion in the rotation direction of the connecting member.

2. a notch is formed in the front end of the slide member, and the pin shafts are respectively provided on inner surfaces of the notches facing each other; The connecting member is provided with a pair of angle members each having a bearing hole into which the pin shaft is fitted and extending in a direction away from the center of the front panel portion at a predetermined interval, The pair of angle members are each provided with the abutment surface portion, 2. The transmitter according to claim 1, wherein the contact surfaces are tapered so as to approach each other from the bearing hole toward the tip end.

3. 3. The transmitter according to claim 1, wherein the projection has a hemispherical head.

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