Transmitter

Abstract

To make it difficult for a water droplet to penetrate through an opening for inserting and removing an end portion of an electric wire provided at the rear of a housing case which containing a switch and a terminal board.SOLUTION: A transmitter comprising: a transmitter main body portion having a housing case containing a switch and a terminal board and attached to an installation plane; and a front panel portion having a push button that actuates the switch, wherein: a rear end of the housing case is opened; a terminal board is facing the opening, and is disposed at a position offset near one of the side walls of the housing case; a rear cover having a window portion is fastened to a rear end of the housing case at a position corresponding to the terminal board so as to close the opening; a rear lid is attached detachably to cover the rear cover; the rear lid is configured to form, at a lower end portion thereof, an opening between the rear lid and a rear cover for inserting and removing a plurality of electric wires connected to a terminal board; and a waterproof wall is provided along the lower edge of the window portion.SELECTED DRAWING: Figure 5

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. Patent Document 1, for example, describes 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 section is connected by a link mechanism to the front of the storage case of the transmitter main body, which has a built-in push button switch and telephone jack, and can be converted 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. [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] Fire alarm transmitters have push-button switches and circuits for generating alarm signals built into their storage cases, and the case must have openings for connecting the ends of the wiring to supply power to the internal circuits and output the alarm signal and audio signal. However, because transmitters are sometimes installed in equipment storage boxes or fire hydrant boxes installed outdoors, they must be designed to prevent water droplets from entering from the outside. Dustproof and waterproof test standards are established by ISO, JIS, etc., and water spray tests conducted in accordance with these standards can sometimes result in splashes of water.

[0008] Therefore, in the transmitter described in Patent Document 2, the rear of the storage case is covered with a back cover, and an opening is provided below the back cover for inserting and removing the ends of external wiring. By devising the position and orientation of the opening in this way, it is possible to make it difficult for water droplets to enter the storage case from the outside. However, even if an opening is provided at the bottom of the back cover covering the rear of the storage case, as in the transmitter described in Patent Document 2, there is a risk that water droplets from rainwater falling in strong winds will enter the storage case through the opening at the bottom of the back cover. Furthermore, waterproofing grade "3" in the dustproof and waterproofing test standard means that a watch will not be adversely affected by rainfall from within 60 degrees left and right of the vertical. However, when conducting tests in which water is sprayed at 60 degrees left and right of the vertical, there is a risk that water droplets will splash onto the bottom opening of the storage case. Therefore, it was found that even if an opening facing downward is provided at the bottom of the back cover, it is difficult to prevent water droplets from entering the storage case.

[0009] The present invention was made with an eye on the above-mentioned problems, and its purpose is to make it difficult for water droplets to enter a transmitter equipped with a storage case that has a built-in push button switch and a front panel attached to the front side through an opening at the rear of the storage case for inserting and removing the end of the wiring. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention provides: A transmitter comprising: a transmitter body portion having a housing case with a built-in on / off switch and a terminal block, the transmitter body portion being attached to an installation surface; and a front panel portion having a push button for operating the switch, The rear end of the storage case is opened, and the terminal block is disposed at a position facing the opening and close to one of the side walls of the storage case, a rear cover having a window at a position corresponding to the terminal block is fixed to the rear end of the storage case so as to close the opening, and a rear lid is detachably attached to cover the rear cover; the rear cover is configured to form an opening at a lower end between the rear cover and the rear cover for inserting and removing a plurality of wires connected to the terminal block, A waterproof wall is provided along the lower edge of the window portion.

[0011] According to the above configuration, in a transmitter equipped with a storage case having a built-in push button switch and a front panel attached to the front side, the provision of a waterproof wall makes it difficult for water droplets to enter through the opening for inserting and removing the ends of the wiring provided between the lower rear end of the storage case and the lower end of the back cover.

[0012] Preferably, the waterproof wall is formed to have a width substantially the same as the width of the window portion, The plurality of wires are configured to be collectively inserted into a space between an end portion of the waterproof wall opposite to the one side wall and the side wall portion of the rear cover. According to this configuration, the opening for inserting and removing the end of the wiring is tightly closed by the bundle of wiring gathered on the side opposite to the window portion and the waterproof wall, making it difficult for water droplets to penetrate. It is possible.

[0013] Here, the waterproof wall is configured to be formed on the rear cover. Alternatively, the waterproof wall may be formed on the inner surface of the side wall of the storage case.

[0014] Furthermore, it is desirable that the lower end of the rear cover be provided with a tapered portion that slopes rearward as it extends downward. According to this configuration, the entrance side of the opening for inserting and removing the end of the wiring can be narrowed, making it more difficult for water droplets to enter. [Effects of the Invention]

[0015] According to the present invention, in a transmitter equipped with a storage case having a built-in push button switch and a front panel attached to the front side, it is possible to make it difficult for water droplets to enter through the opening provided at the rear of the storage case for inserting and removing the ends of the wiring. [Brief explanation of the drawings]

[0016] [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 an enlarged perspective view showing the state in which a rear cover and a back lid are attached to the rear part of the storage case of the transmitter of the embodiment of FIG. 1. FIG. [Figure 4] 2 is an enlarged 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 5] 10 is a perspective view showing the state in which the rear cover and back lid are removed from the rear of the storage case. FIG. [Figure 6] FIG. 10 is an enlarged perspective view showing a state in which wiring is connected to a terminal block in the storage case. [Figure 7] FIG. 10 is an enlarged view of the lower part of the terminal block showing the rear cover and rear lid according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] 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.

[0018] 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.

[0019] 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.

[0020] Also, a circuit board 16 that detects when push button switch 11 is turned on and sends a signal to the outside is disposed inside storage case 13, and a back cover 18 is attached to the opening at the rear of storage case 13, with a back lid 19 provided to cover back cover 18. Back lid 19 is rectangular and has walls on three sides except the bottom side, and because there is no wall on the bottom side, an opening 19a is formed for inserting and removing the ends of wires from the outside, as shown in Figure 3.

[0021] The transmitter main body 10 is attached so that the flange 13a at the front end of the storage case 13 is joined to the installation surface. 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.

[0022] In addition, the base 22A of the front panel portion 20 has a bowl-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 base 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 engagement wall 25d is provided on the periphery of the front surface of the holding member 25, which engages with the cylindrical engagement portion 22a of the base 22A.

[0023] 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.

[0024] 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. 4, 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.

[0025] 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. 4, a notch 26b is formed at the front end of the slide plate 26, and a pair of angles 27g that engage with the notch 26b of the slide plate 26 is provided at the lower end of the connecting member 27. At the end, a pair of pin shafts 26c are provided corresponding to the pair of angles 27g so that the ends slightly protrude into the inside of the notches 26b. Note that only one of the pair of pin shafts 26c is visible in Figure 4.

[0026] Next, the detailed structure of the first embodiment of the rear cover 18 and back lid 19 provided at the rear of the storage case 13 will be explained using Figures 5 and 6. Of these, Figure 5 shows the state where the rear cover 18 and back lid 19 are removed from the rear of the storage case 13, and Figure 6 shows the state where wiring is connected to the terminal block inside the storage case 13. 5, in the transmitter of this embodiment, a terminal block 31 for electrically connecting the ends of wiring is provided along the inner surface of one side wall of the storage case 13. The terminal block 31 has a vertically long shape with multiple terminals arranged in a single vertical row. Although not shown, each terminal of the terminal block 31 is connected to electronic components on the circuit board 16 via printed wiring formed on the board.

[0027] On the other hand, rear cover 18 is formed with top wall 18a and both left and right side walls 18b that protrude rearward, and plate portion 18c that connects between these walls and is in contact with top wall 18a and one side wall 18b, and plate portion 18c is provided with window portion 18d. Furthermore, terminal block 31 is fixed parallel to the inner surface of the side wall of storage case 13 with a slight gap between them, and is configured so that terminal block 31 protrudes from window portion 18d when rear cover 18 is attached to the rear of storage case 13.

[0028] Furthermore, a wall 18e having a height approximately the same as that of the side wall and a width slightly wider than that of the window portion 18d is provided at the lower edge of the window portion 18d of the rear cover 18, and this wall 18e functions as a waterproof wall as described below. As mentioned above, the back cover 19 is rectangular and has walls on three sides except the bottom side. As shown in FIG. 3, when the back cover 19 is attached to the back cover 18, an opening 19a is formed at the bottom of the rear end of the storage case 13 for inserting and removing the ends of the wiring from the outside.

[0029] The outer surface of the wall of the back cover 18 is provided with a vertically straight rib 18f that protrudes outward and abuts against the rear end surface of the peripheral wall of the storage case 13 to engage the back cover 18 with the peripheral wall of the storage case 13. The outer surfaces of the side walls of the back cover 18 are also provided with guide ribs 18g that extend parallel to the rib 18f and guide the back cover 19. Furthermore, although not shown, the inner surfaces of the left and right side walls of the back cover 19 are formed with ribs that slidably engage between the ribs 18f, 18g. This allows the back cover 19 to be attached to the back cover 18 by inserting the lower ends of the ribs on the back cover 19 between the ribs 18f, 18g of the back cover 18 from above and then sliding the back cover 19 downward.

[0030] 6, after connecting the ends of multiple wires 32 to the terminals of terminal block 31, the bundle of wires 32 is gathered on the side without wall 18e (the space on the right side in FIG. 6) and drawn out to the outside of storage case 13. In this way, when back lid 19 is attached to rear cover 18, opening 19a at the lower rear end of storage case 13 can be blocked by wall 18e as a waterproof wall and the bundle of wires 32. As a result, even if water droplets D fall onto the opening 19a from below, as shown in FIG. 6, the water droplets can be prevented from entering the interior of the storage case 13. Furthermore, a tapered portion 18h that slopes backward as it extends downward is provided at the bottom of the rear cover 18. This narrows the opening 19a at the bottom rear end of the storage case 13, making it more difficult for water droplets to enter.

[0031] Next, the detailed structure of the rear cover 18 and rear lid 19 according to the second embodiment will be described with reference to FIG. In the second embodiment, the waterproof wall (18e) is not provided on the inner surface of the side wall of the rear cover 18, but is provided as a waterproof wall portion 13c at the lower rear end of the inner surface of the side wall of the storage case 13, as shown in Figure 7.

[0032] In the second embodiment as well, when the back lid 19 is attached to the rear cover 18, the opening 19a at the bottom rear end of the storage case 13 can be blocked by the waterproof wall portion 13c and the bundle of wires 32. As a result, even if water droplets fall onto the opening 19a from below, they can be prevented from entering the interior of the storage case 13. Furthermore, the waterproof wall portion 13c in the second embodiment has a left-right width that is approximately the same as the width of the window portion 18d formed in the rear cover 18, and is formed so that its front-to-rear width is greater than that of the wall body 18e in the first embodiment. This makes it possible to close the opening below the terminal block 31 to a greater extent than in the first embodiment.

[0033] 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-described embodiment, the back cover 19 that covers the back cover 18 is configured to be slidable in the vertical direction, but the back cover 19 may also be attached to the back cover 18 using screws or the like. In the above embodiment, the waterproof wall 18e or waterproof wall portion 13c is provided along the lower edge of the window portion 18d provided in the rear cover 18, but a waterproof wall may be provided along the lower end portion of the rear cover 18. In this case, the waterproof wall may be formed in an L-shape or a U-shape that is continuous with the waterproof wall 18e.

[0034] In addition, in the above embodiment, the present invention is described as being applied to a fire alarm transmitter having a front panel with an indicator light integrated on the front, but it is also possible to apply the present invention to a fire alarm transmitter having a front panel without an indicator light. 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]

[0035] 10 Transmitter main body 11 Push-button switch 12. Telephone Jack 13 Storage case 13a Flange 13b Bottom wall 13c Waterproof wall section 14 Inner protection plate 15 compression spring 16 Circuit Board 18 Back cover 18a Upper wall 18b side wall 18c plate section 18d Window section 18e waterproof wall 18th floor Rib 18g guide rib 18h tapered section 19 Back cover 19a Opening for wiring 20 Front panel 21 Push Button 22 Light emitting part 22A base 22B Light guide plate 22C Cover material 23 Light-emitting element (LED) 24 LED boards 25 Retaining member 26 Slide plate (slide member) 27 Connecting member

Claims

1. A transmitter comprising: a transmitter body section that has a housing case incorporating a switch that can be turned on and off and a terminal block and that can be attached to an installation surface; and a front panel section that has a push button for operating the switch, The rear end of the storage case is opened, and the terminal block is disposed at a position facing the opening and close to one of the side walls of the storage case, a rear cover having a window at a position corresponding to the terminal block is fixed to the rear end of the storage case so as to close the opening, and a rear lid is detachably attached to cover the rear cover; the rear cover is configured to form an opening at a lower end between the rear cover and the rear cover for inserting and removing a plurality of wires connected to the terminal block, A transmitter characterized in that a waterproof wall is provided along the lower edge of the window portion.

2. The waterproof wall is formed to have a width substantially the same as the width of the window portion, 2. The transmitter according to claim 1, wherein the plurality of wires are collectively inserted into a space between an end of the waterproof wall opposite to the one side wall and the side wall portion of the rear cover.

3. 3. The transmitter according to claim 1, wherein the waterproof wall is formed on the rear cover.

4. 3. The transmitter according to claim 1, wherein the waterproof wall is formed on the inner surface of the side wall of the storage case.

5. 3. The transmitter according to claim 1, wherein the rear cover has a tapered portion at the bottom end thereof that is inclined rearward as it extends downward.

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