JP4994681B2 - Portable gas alarm - Google Patents

Description

  The present invention relates to a portable gas alarm.

In general, for example, in underground construction sites, tunnels, places where people enter, work areas, etc., there is a risk that dangerous gases such as carbon monoxide gas or hydrogen sulfide gas may be contained in the air of the environment. In many cases, there is a possibility that the air in the environmental atmosphere is in a dangerous state or in a dangerous state, such as when the oxygen gas concentration in the air may be lowered.
And when it becomes dangerous to humans due to the high concentration of dangerous gas contained in the air or low oxygen gas concentration, it is necessary to immediately know that It is.
From such a request, various types of portable gas detectors have been proposed so far (see, for example, Patent Document 1).

  Thus, such a portable gas detector is required to be configured to be sufficiently small so as not to be a major obstacle in performing the intended work, for example, and for example in a manhole. Since it may be used to measure the air condition of the gas measurement target space such as where water is collected, etc., a waterproof structure that prevents water from entering from the outside is adopted. Is desirable.

JP 2002-257768 A

  The present invention has been made based on the circumstances as described above, and can be configured as a small portable device that is convenient to carry, has high convenience in use, and further reduces the number of components. Another object of the present invention is to provide a portable gas alarm device that can form a large display portion while being small in size.

The portable gas alarm device of the present invention includes a box-shaped casing that can be held and held by hand, and a functional member related to a gas detection operation including a display substrate is disposed in the upper half of the casing. And a gas alarm device body formed by arranging a battery chamber and a sensor mounting portion side by side in the lower half, and a gas sensor detachably mounted on the sensor mounting portion of the gas alarm device body Has been
A panel-shaped display mechanism, a switch element, and an alarm light-emitting element are provided on the front side of the display substrate, and a panel-shaped protective window member is provided to cover the panel-shaped display mechanism, the switch element, and the alarm light-emitting element. Is mounted on the casing to form a display unit, an operation unit, and a light emitting unit for alarm,
The protective window member is formed by integrally forming the cover portion covering the panel-like display mechanism, the switch element, and the alarm light emitting element, and is configured by attaching a film material to the entire surface of the transparent substrate. In the transparent substrate, a switch driving portion that is elastically displaced in a direction perpendicular to the surface of the transparent substrate is formed at a position corresponding to the switch element provided on the display substrate. And

Moreover, in the portable gas alarm device of the present invention , for example, the size of the display portion in the gas alarm device main body can be 17% or more of the size of the entire front area of the gas alarm device main body.
The protective window member is preferably made of a film obtained by film molding.

  Furthermore, in the portable gas alarm device of the present invention, the cover portion that covers the alarm light emitting element in the protective window member can have a light emission function.

Furthermore, in the portable gas alarm device of the present invention, the sensor mounting portion in the gas alarm device main body is any one selected from a plurality of identical gas sensors having different types of detection target gases according to the purpose. The gas sensor is configured to be interchangeable with other gas sensors,
The gas sensor is preferably configured to include a storage unit in which information unique to the gas sensor is recorded.
Moreover, it is preferable that the gas sensor has a temperature detection unit, and a temperature compensation condition for a gas detection signal from the gas sensor is set based on temperature information detected by the temperature detection unit.

According to the portable gas alarm device of the present invention, basically, the casing is of a size that can be held by hand, and a functional member for gas detection is arranged in the upper half of the casing. In addition, the sensor mounting part and the battery chamber are formed side by side in the lower half, and all the necessary components are rationally arranged in the casing. As a result of being able to be configured as a small one, excellent portability and high convenience can be obtained, and the protective window member covers the panel-like display mechanism and the switch element. Since the part or one of the cover parts covering the alarm light emitting element is integrally formed, the number of parts can be reduced, so that a predetermined gas alarm device can be advantageously used. Forming the waterproof structure of the mounting portion of the casing and the protective window member it is possible Seisuru is facilitated.
Since the protective window member is formed by integrally forming all the cover portions that cover the panel-shaped display mechanism, the switch element, and the alarm light emitting element, the above effect can be obtained more reliably.

  The protective window member is formed by adhering a film material to the entire surface of the transparent substrate, thereby improving the scratch resistance of the display unit in the gas alarm device body by the film material positioned on the surface side. Can do.

  In order to obtain a sufficient mechanical strength, it is necessary to provide a reinforcing member for the structure in which the display portion forming opening is formed on the front surface of the casing, but the switch driving portion is integrally formed on the protective window member. As a result, the shape, arrangement position and other structural restrictions of the reinforcing member can be relaxed, so that a high degree of design freedom can be obtained and the display portion forming opening can be formed large. it can.

  Since the cover portion that covers the alarm light emitting element in the protective window member has a light diffusion function, the light emission of the alarm light emitting unit can be reliably confirmed.

Furthermore, since the gas sensor has storage means in which information unique to the gas sensor is recorded, the operating environment conditions of the gas alarm device body are automatically set according to the installed gas sensor when the gas sensor is installed. Therefore, it is not necessary to perform complicated operations and high convenience can be obtained.
In addition, the temperature compensation condition is automatically set according to the installed gas sensor based on the temperature information from the temperature detection means, so that reliable gas detection according to the actual environmental conditions can be performed. However, it is not necessary to perform a complicated operation and high convenience can be obtained.

The present invention will be described below with reference to the drawings.
1 is a front view showing a configuration example of a portable gas alarm device according to the present invention, FIG. 2 is a plan view of the portable gas alarm device shown in FIG. 1, and FIG. 3 is a portable gas alarm device shown in FIG. 4 is a bottom view of the portable gas alarm shown in FIG. 1, FIG. 5 is a left side view of the portable gas alarm shown in FIG. 1, and FIG. 6 is a portable type shown in FIG. FIG. 7 is a vertical sectional view taken along line AA in FIG. 1, FIG. 8 is a horizontal sectional view taken along line BB in FIG. 1, and FIG. 9 is a vertical sectional view taken along line CC in FIG. FIG. 10 is a cross-sectional view taken along the line DD of FIG. Hereinafter, unless otherwise specified, the vertical direction in FIG. 1 is referred to as “vertical direction” and the horizontal direction in FIG. 1 is referred to as “horizontal direction”. However, the usage mode of the gas alarm is limited. is not.

  The portable gas alarm (hereinafter simply referred to as “gas alarm”) 10 includes a casing 11 having a generally box shape that can be held and held by hand. A functional member relating to the gas detection operation is disposed in the part, and the battery alarm body 10A is formed in the lower half with the battery chamber 13 and the sensor mounting part 15 arranged side by side.

The casing 11 includes a back side casing member 12 and a front side casing member 20 connected and fixed to the back side casing member 12 via a ring-shaped packing 25 with fixing screws 11A, as shown in FIG. As described above, the battery chamber 13 forming the substantially cylindrical sensor mounting portion 15 and the battery receiving portion 13A is formed by the rear casing member 12 alone. Here, the ring-shaped packing 25 is disposed over the entire circumference of the contact surface 26 between the back-side casing member 12 and the front-side casing member 20.
As shown in FIG. 12, the front casing member 20 has a relatively large size of about 25% of the entire front area of the front casing member 20, which forms a display part and an alarm light emitting part in the upper half area. The front opening 21 and the operation portion forming opening 22 having a large occupied area are formed in a position aligned vertically, and the left and right positions are located between the front opening 21 and the operation portion forming opening 22 on the back surface. A flat plate-like reinforcing member 23 is provided.

  The upper half of the casing 11 includes a flat display substrate 46A, a flat power supply substrate 46B including a power supply circuit and a charging circuit, and a gas detection signal processing circuit for processing signals from the gas sensor. The flat CPU board 46C is arranged in three dimensions so as to extend in the vertical direction along the front and back surfaces of the casing 11 in parallel with each other, and the display board 46A is held and fixed to the front casing member 20. At the same time, the power supply board 46 </ b> B and the CPU board 46 </ b> C are held and fixed to the rear casing member 12.

On the display substrate 46A, a panel-like display mechanism 47 made of, for example, a liquid crystal display panel in which the detected gas type and its concentration are displayed in a region facing the front opening 21 of the front casing member 20 and this panel. An alarm light-emitting element 48 made of a light-emitting diode (not shown) is disposed above the state display mechanism 47, and there are, for example, three areas in the region facing the operation portion forming opening 22 of the front casing member 20. Switch elements 49A, 49B, 49C are arranged side by side.
And the front opening part in casing 11 is covered so that the specific protection window member 50 explained in full detail below may cover the whole arrangement | positioning area | region of the panel-like display mechanism 47, the light emitting element 48 for warning, and switch element 49A, 49B, 49C. Accordingly, a display unit 51, an alarm light emitting unit 52, and an operation unit 53 are formed.
In addition, a light guide plate is provided at a position on the back side of the panel-like display mechanism 47, and a backlight composed of a light emitting diode (not shown) that irradiates the panel-like display mechanism 47 with light through the light guide plate. Can be configured.

  In the operation unit 53, the first operation button 53A constituting the main switch labeled “POWER” is on the right side, and the second operation button 53B constituting the changeover switch labeled “DISP” is located on the center. The third operation buttons 53C constituting the function adjustment switch labeled “AIR” are arranged on the left side.

  In the panel-like display mechanism 47, for example, the detected gas concentration is displayed numerically at the center position. Moreover, it can also be set as the structure displayed by switching sequentially by automatic or manual operation so that other information may be displayed.

  The CPU board 46C is provided with an electronic circuit having a function of controlling the operation of each part in the gas alarm device 10, and for example, a storage element for storing log data detected by the gas sensor 55 is provided.

  As described above, the battery chamber 13 and the sensor mounting portion 15 are formed in the lower half portion inside the casing 11, and the battery insertion port 13B and the sensor mounting port 15A are in the same direction, specifically in the downward direction. The battery 14 and the gas sensor 55 are pulled out in the same direction.

  In this gas alarm device 10, as shown in FIG. 13, for example, a cylindrical sensor body 56, a cylindrical holder member 61 that holds the sensor body 56 inside, and one end portion of the holder member 61 are fitted. A gas sensor 55 configured as one structure with the adapter 60 formed of a rubber grip member 65 is detachably mounted on the sensor mounting portion 15 of the gas alarm device body 10A. In FIG. 13, 64 is an engagement protrusion that is engaged with an engagement mounting portion (not shown) of the sleeve member 16 provided in the gas alarm device main body 10 </ b> A, and 68 is mounted on the outer peripheral surface of the holder member 61. It is a ring-shaped packing.

A gas sensor holding sleeve member 16 is mounted on the inner surface of the sensor mounting portion 15, and a connecting connector member 18 is mounted on the upper end surface, that is, the end surface on the far side in the mounting direction of the gas sensor 55. Any one gas sensor selected according to the purpose from a plurality of identical gas sensors provided with sensor bodies 56 having different types of target gas is configured to be exchangeable with other gas sensors.
Further, in the state where the gas sensor 55 is mounted, a visual recognition opening 19 for exposing the gas name of the gas sensor 55 to the outside is formed at an outer surface position close to the sensor mounting port 15A.

The sensor body 56 includes, for example, a sensor element made of a constant potential electrolytic sensor, and a sensor substrate 57 that is provided integrally with the sensor element and has a memory in which information unique to the sensor element is recorded and a thermistor for temperature compensation. The gas inlet 56A is formed on one end surface (for example, the lower surface in FIG. 13).
The sensor element is a cylindrical sensor having a gas detection electrode structure in which a working electrode and a counter electrode each having a plate-like electrode body in which fluid flow passages are formed are stacked with an electrolyte solution holding member interposed therebetween. A pin-shaped external lead member for each of the working electrode and the counter electrode is disposed so as to extend in the axial direction at a position provided in the case and spaced apart from each other in the circumferential direction on the outer peripheral surface of the sensor case.
The type of the detection target gas is not particularly limited, and examples thereof include PH ₃ , SO ₂ , CO, H ₂ S, NH ₃ , Cl ₂ , and O ₃ .

The gas sensor 55 is inserted from the sensor mounting port 15A of the gas alarm device main body 10A and rotated clockwise, for example, so that the display (gas name) on the sensor main body 56 is displayed on the viewing opening 19 in the sensor mounting portion 15. In the state exposed to the outside, the sensor mounting portion 15 is held and fixed by the engaging mounting portion of the sleeve member 16 and is electrically connected to the connecting connector member 18.
In a state where the gas sensor 55 is mounted, the portion of the gas sensor 55 excluding the grip member 65 of the adapter 60 is accommodated in the sensor mounting portion 15 of the gas alarm device main body 10A and the portion protruding outside the casing 11 is as much as possible. It is in a reduced state. However, since the grip member 65 protrudes to the outside, the gas sensor 55 can be easily attached and detached (exchanged).

The battery chamber 13 has a battery receiving portion 13A for receiving, for example, two columnar batteries 14, specifically, AA dry batteries (AA size) arranged side by side on the left and right. The battery 14 is loaded in the portion 13A with the positive electrode and the negative electrode facing in opposite directions, and the battery cover 30 with the power terminal 45 provided on the back surface is mounted in the battery insertion slot 13B. Thereby, the two batteries 14 are connected in series. The battery lid 30 is provided with a ring-shaped packing (not shown) on the side surface.
At the opening edge portion of the battery insertion port 13B, a notch 13C is formed on the right side wall of the casing 11, and for example, even when the battery lid 30 is mounted without the battery 14 being loaded, The battery cover 30 can be easily removed.

As described above, the display unit 51, the alarm light emitting unit 52, and the operation unit 53 in the gas alarm device main body 10A are provided on the display substrate 46A, respectively, with the panel-like display mechanism 47, the switch elements 49A, 49B, The protective member is provided so as to cover 49C and the alarm light emitting element 48. However, in the gas alarm device of the present invention, the cover portion that covers the panel-like display mechanism 47 and the switch elements 49A, 49B, 49C. A protective window member is used in which one of the cover portion covering the cover and the cover portion covering the alarm light emitting element 48 is integrally formed.
In this embodiment, the protective window member 50 is formed by integrally forming a cover portion that covers the panel-like display mechanism 47, the switch elements 49A, 49B, 49C, and the alarm light emitting element 48. Yes.

  As shown in FIGS. 14 to 16, the protective window member 50 has a display window portion 50A constituting a cover portion that covers the panel-like display mechanism 47, and a light emission function continuous to the upper end of the display window portion 50A. , An alarm display portion cover portion 50B constituting a cover portion covering the alarm light emitting element 48, and a switch cover portion constituting a cover portion covering the switch elements 49A, 49B, 49C formed at a position below the display window portion 50A. 50C.

The protective window member 50 is configured by attaching a film material to the entire surface of a transparent substrate made of, for example, a resin material.
The transparent substrate is integrally formed with switch element drive portions 54A, 54B, 54C that are elastically displaced in a direction perpendicular to the surface thereof, and film portions 541 that cover the respective switch element drive portions 54A, 54B, 54C. There are displays 542 and 543 indicating the type of switch.
Then, each of the switch drive portions 54A, 54B, 54C is mounted on the front opening 21 in a state where it is inserted into the operation portion forming opening 22 of the front casing member 20.

Examples of the resin material constituting the transparent substrate include methacrylic resin, polycarbonate resin, and ABS resin.
The thickness of the transparent substrate is, for example, 0.8 to 3 mm.

The film material has deformability, and the switch drive parts 54A, 54B, 54C immediately below are driven by pushing the film parts 541, 542, 543 on which the corresponding part, ie, the display indicating the type of switch, is pressed, and the display substrate The switch elements 49A, 49B and 49C of 46A are activated.
Examples of the material constituting the film material include PET and PBT.
The thickness of the film material is, for example, 0.1 to 0.2 mm.

The protective window member 50 is preferably made by, for example, film molding. In this embodiment, for example, the one made as follows is used. That is, a display indicating the type of switch is formed on the film material by printing, and after the adhesive (paste) for application is printed (applied), the protective film member mounting portion of the casing 11 is attached to the film material. The shape of the mold having a molding space conforming to the shape of the mold, that is, processing (deformation) into a desired shape and placing in the molding mold, filling the molding space with the resin material constituting the transparent window plate It can be produced by molding.
Since the protective window member 50 is obtained by film molding, the adhesive strength between the transparent substrate and the film material can be made sufficiently high, so that the film material is surely prevented from peeling off. be able to.

In the gas alarm device 10 described above, for example, the infrared communication port 28 for reading the gas concentration data detected by the gas sensor 55 and recorded in the storage element of the CPU substrate 46C is the upper half of the right side surface of the gas alarm device body 10A. Is formed.
Further, a protect cover 70 made of, for example, a conductive thermoplastic elastomer composition and having a mounting portion that itself is mounted on the gas alarm body 10A is detachably mounted.

As shown in FIG. 17, the protect cover 70 has a mounting portion 71 having a shape that conforms to the shape of a part of the outer surface of the casing 11 of the gas alarm device main body 10 </ b> A on its inner surface. A front opening 72 that exposes the display unit 51, the alarm light emitting unit 52, and the operation unit 53 of the alarm main body 10A to the outside is formed, and a gas alarm mounting opening 73 is formed on the back surface. Further, a gas sensor mounting opening 74 and a battery insertion opening 75 are formed on the bottom surface, and an infrared communication port exposing opening 76 is formed on the right side surface.
The protective cover 70 is configured such that the gas alarm device mounting opening 73 is opened by a human hand so that the gas alarm device main body 10A can pass through, and its shape is restored by its own elasticity. The gas alarm device main body 10 </ b> A received by the mounting portion 71 is held.
When the protect cover 70 is attached, the size of the continuous resin surface portion of the casing 11 of the gas alarm device main body 10A exposed to the outside is regulated to a predetermined size, for example, 100 cm ² or less. Therefore, the countermeasure against static electricity is sufficient and the explosion-proof property is highly reliable. Further, since the material constituting the protective cover 70 also functions as a buffer material (protective material) for the gas alarm device main body 10A due to the impact resistance of the material itself, it is possible to prevent the gas alarm device main body 10A from being broken or damaged. Can do.

  In the configuration example of the gas alarm device 10 of the present invention, the maximum size in the vertical direction (vertical direction in FIG. 1) of the gas alarm main body 10A is 131 mm, and the maximum size in the horizontal direction (left and right direction in FIG. 1) is 77 mm. The maximum dimension in the thickness direction (the direction perpendicular to the paper surface in FIG. 1) is 40 mm, and the total weight in a state in which the gas detection operation is possible (a state where the gas sensor 55 and the two batteries 14 are mounted) is 240 g. It is.

Hereinafter, the operation of the gas alarm device 10 will be described.
First, after the gas sensor 55 selected according to the purpose is mounted on the gas sensor mounting portion 15 of the gas alarm device main body 10A, the gas sensor main body 10A is operated by operating the first operation button 53A. In addition, the panel-like display mechanism 47 and other parts are set in an operating state, and the operating environmental conditions of the gas alarm device main body 10A are mounted according to information unique to the gas sensor 55 recorded in the memory of the sensor substrate 57 in the gas sensor 55. The temperature compensation condition is automatically set according to the gas sensor 55, and the temperature compensation condition is automatically set based on the temperature information from the thermistor.
In this state, air in the environmental atmosphere reaches the sensor main body 56 through the gas introduction port 56 </ b> A by natural diffusion, the concentration of the target detection target gas is detected, and the result is displayed on the panel-shaped display mechanism 47. Is displayed.

The concentration of the gas detected by the gas sensor 55 is sent as a current signal or a voltage signal to the signal processing circuit of the CPU board 46C for processing, whereby the concentration of the detection target gas is set to the reference value (alarm set for the gas). When the point is exceeded, an alarm operation signal is issued, whereby the alarm light emitting unit 52 is driven to generate an alarm by light emission.
When performing concentration detection for different types of gases, the gas sensor 55 may be replaced and the same operation may be repeated. To replace the gas sensor 55, the grip member 65 is held and rotated counterclockwise to unlock the sleeve member 16 by the engaging mounting portion, the gas sensor 55 to which the adapter 60 is mounted is pulled downward, and the like. By mounting this gas sensor on the sensor mounting part 15 of the gas alarm device main body 10A, the operating environment conditions and temperature compensation conditions of the gas alarm device main body 10A are in accordance with the replaced gas sensor based on information unique to the gas sensor. Is automatically set to a gas detection operation.

  In practice, the gas alarm device 10 is used by being carried by an operator, for example, by being held in the hand of the operator, but the environment atmosphere in which the operator is present has a high concentration of dangerous gas, or When the oxygen gas concentration is low and the state becomes dangerous, the fact is notified by the display on the display unit 51 and the light emission from the alarm light-emitting unit 52. Measures can be taken, or measures such as evacuation from the place can be taken.

Thus, according to the gas alarm device 10, basically, the casing 11 is of a size that can be held and held, and the functional member for gas detection is the upper half of the casing 11. Since the sensor mounting portion 15 and the battery chamber 13 are formed in the lower half of the casing 11 and all the necessary components are rationally arranged in the casing 11. The gas alarm device 10 itself can be configured as a small one, and thus excellent portability and high convenience can be obtained.
In addition, the protective window member 50 includes a display window portion 50A that covers the panel-like display mechanism 47, an alarm display portion cover portion 50B that covers the alarm light emitting element 48, and a switch cover portion 50C that covers the switch elements 49A, 49B, and 49C. As a result of being integrally formed, the number of parts can be reduced. As a result, the predetermined gas alarm device 10 can be advantageously manufactured, and the casing 11 and the protective window member 50 are mounted. The waterproof structure of the part can be easily formed.

  Further, since the protective window member 50 is formed by adhering a film material to the entire surface of the transparent substrate, the display portion in the gas alarm device main body 10A has excellent resistance to resistance by the film material positioned on the surface side. It can comprise as what has abrasion property.

  In addition, because the front opening 21 and the operation portion forming opening 22 are formed on the front surface of the casing 11, it is necessary to provide the reinforcing member 23 in order to obtain sufficient mechanical strength. Since the switch drive portions 54A, 54B, and 54C corresponding to the switch elements 49A, 49B, and 49C are integrally formed on the member 50, when the casing 11 is formed, the shape, the arrangement position, and the others of the reinforcing member 23 As a result, the high degree of freedom in design can be obtained, and the front opening 21 can be formed large, that is, the size of the entire front area of the gas alarm device main body 10A can be 25. % Or more can be formed.

  Since the switch cover portion 50C constituting the cover portion that covers the alarm light emitting element 48 in the protective window member 50 has a light diffusing function, the light emission of the alarm light emitting portion 52 can be reliably confirmed.

  Furthermore, in the gas alarm device 10, as the gas sensor 55 is attached, the operating environment conditions and temperature compensation conditions of the gas alarm device body 10 </ b> A are automatically changed to those corresponding to the attached gas sensor 55. Therefore, it is not necessary to perform complicated operations and high convenience can be obtained.

  In the gas alarm device 10, (1) the casing 11 is connected to the front casing member 20 and the rear casing member 12 via a ring-shaped packing 25 disposed over the entire circumference of the contact surface 26. (2) the ring-shaped packing 68 is interposed between the inner surface of the sensor mounting portion 15 of the gas alarm device body 10A and the outer peripheral surface of the holder member 61 associated with the gas sensor 55, and (3) the battery lid 30. Since a sufficiently reliable waterproof structure is formed by attaching the ring-shaped packing 44 to the side of the water, it is possible to reliably prevent water from entering the gas alarm device main body 10A from the outside. For example, it is extremely useful for detecting gas in an environment where water may enter the gas alarm device body 10A from the outside. .

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to said embodiment, A various change can be added.
For example, the method of using the gas alarm is not limited to the method of holding and holding the gas alarm by hand, and the gas alarm can be used by being attached to the body with an appropriate attachment.
For example, as shown in FIG. 18, the sensor mounting portion 82 having the same configuration as the sensor mounting portion 15 of the gas alarm device main body 10A is provided at one end and the sensor mounting portion 15 of the gas alarm device main body 10A is mounted at the other end. For example, a remote cable 80 having a length of 0.5 to 20 m is used, and the gas inlet 56A of the gas sensor 55 can be arbitrarily set by gripping only the tip end to which the gas sensor 55 is mounted. The gas alarm device main body 10A can be held by hand or attached to the body, and the tip end portion to which the gas sensor 55 is attached can be inserted into a manhole, for example. .

Furthermore, in the gas alarm device of the present invention, it may be used by directly attaching to a person's body using an appropriate attachment member or attaching to a person's clothes. A clip, a pin, etc. can be mentioned.
In addition, as an alarm notification mechanism in a gas alarm device, for example, an alarm buzzer and an alarm vibration generator (which emits a low frequency of about several tens of hertz) can be provided. In addition to light emission by the light emitting unit, an alarm is generated by a buzzer sound by an alarm buzzer and vibration by an alarm vibration generator.

It is a front view which shows the example of 1 structure of the portable gas alarm device of this invention. It is a top view of the portable gas alarm device shown in FIG. FIG. 2 is a rear view of the portable gas alarm device shown in FIG. 1. FIG. 2 is a bottom view of the portable gas alarm device shown in FIG. 1. It is a left view of the portable type gas alarm device shown in FIG. It is a right view of the portable gas alarm device shown in FIG. It is a longitudinal cross-sectional view in AA of FIG. It is a cross-sectional view in BB of FIG. It is a longitudinal cross-sectional view in CC of FIG. It is a cross-sectional view in DD of FIG. It is a front view of a back side casing member. It is a rear view of a front casing member. It is explanatory drawing which shows the outline of a structure in an example of a gas sensor. It is a front view which shows the structure in an example of the window member for protection. FIG. 15 is a rear view of the protective window member shown in FIG. 14. It is a perspective view of the window member for protection shown in FIG. It is a perspective view which shows the structure of a protect cover. It is a perspective view for explanation which shows the state where the remote cable was connected to the gas alarm.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Portable type gas alarm device 10A Gas alarm device main body 11 Casing 11A Fixing screw 12 Back side casing member 13 Battery chamber 13A Battery receiving part 13B Battery insertion port 13C Notch part 14 Battery 15 Sensor mounting part 15A Sensor mounting port 16 Sleeve member DESCRIPTION OF SYMBOLS 18 Connector member 19 Connection opening part 20 Front side casing member 21 Front opening part 22 Operation part formation opening part 23 Reinforcement member 25 Ring-shaped packing 26 Contact surface 28 Infrared communication port 30 Battery cover 45 Power supply terminal 46A For display Substrate 46B Power supply substrate 46C CPU substrate 47 Panel-like display mechanism 48 Light emitting element for alarm 49A, 49B, 49C Switch element 50 Protection window member 50A Display window part 50B Alarm display part cover part 50C Switch cover part 51 Display part 52 Alarm generator Portion 53 Operation portion 53A First operation button 53B Second operation button 53C Third operation button 54A, 54B, 54C Switch element drive portion 541, 542, 543 Film portion 55 Gas sensor 56 Sensor body 56A Gas inlet 57 Sensor substrate 60 Adapter 61 Holder member 64 Engaging protrusion 65 Grip member 68 Ring-shaped packing 70 Protect cover 71 Mounting portion 72 Front opening 73 Gas alarm mounting opening 74 Gas sensor mounting opening 75 Battery insertion opening 76 Infrared communication port opening 80 Remote cable 82 Sensor mounting part 85 Mounted part

Claims (6)

A box-shaped casing that can be held and held by hand is provided, and a functional member relating to a gas detection operation including a display substrate is disposed in the upper half of the casing, and a battery chamber is disposed in the lower half And a gas alarm device body formed by arranging sensor mounting parts side by side, and a gas sensor detachably mounted on the sensor mounting part of the gas alarm device body,
A panel-shaped display mechanism, a switch element, and an alarm light-emitting element are provided on the front side of the display substrate, and a panel-shaped protective window member is provided to cover the panel-shaped display mechanism, the switch element, and the alarm light-emitting element. Is mounted on the casing to form a display unit, an operation unit, and a light emitting unit for alarm,
The protective window member is formed by integrally forming the cover portion covering the panel-like display mechanism, the switch element, and the alarm light emitting element, and is configured by attaching a film material to the entire surface of the transparent substrate. In the transparent substrate, a switch driving portion that is elastically displaced in a direction perpendicular to the surface of the transparent substrate is formed at a position corresponding to the switch element provided on the display substrate. A portable gas alarm.   2. The portable gas alarm device according to claim 1, wherein the protective window member is obtained by film molding.   The portable gas alarm according to claim 1 or 2, wherein the size of the display portion in the gas alarm device main body is 17% or more of the size of the entire front area of the gas alarm device main body. vessel.   The portable gas alarm device according to any one of claims 1 to 3, wherein a cover portion of the protective window member covering the alarm light emitting element has a light emission function. The sensor mounting portion in the gas alarm device body is configured such that any one gas sensor selected according to the purpose from among a plurality of identical gas sensors having different types of detection target gases can be replaced with another gas sensor. Has been
The portable gas alarm device according to any one of claims 1 to 4, wherein the gas sensor includes storage means in which information unique to the gas sensor is recorded.   6. The portable according to claim 5, wherein the gas sensor has a temperature detection means, and temperature compensation conditions for a gas detection signal from the gas sensor are set based on temperature information detected by the temperature detection means. Type gas alarm.