JP4814658B2 - 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 on the basis of the circumstances as described above, and can be configured as a small portable device that is convenient for carrying, has high convenience in use, and is excellent in waterproofness. The object is to provide a gas alarm.

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 is disposed in an upper half portion inside the casing and a lower part. A battery chamber with a battery insertion opening that opens in the lower part of the casing and a sensor mounting part on the left and right sides of the gas alarm unit body, and the sensor mounting part of this gas alarm unit body are detachably mounted. Gas sensor,
In the battery chamber, two columnar batteries are received in a state where they are arranged side by side, and a battery lid having a power terminal on the back surface and ring packing on the side surface is housed in the battery insertion slot. It is installed in the state that has been
Battery cover includes a base member which is countersunk hole formed in the surface, and a rotation plate stopper member provided rotatably on the surface side of the base member, the rotary plate stopper member has its rear surface The rotating shaft portion formed on the base member is inserted into the counterbore hole of the base member , so that it can be rotated without penetrating the base member.

In the portable gas alarm device of the present invention, the battery cover includes an arc-shaped guide groove formed on the back surface of the rotating plate stopper member, two recesses connected to each other by the guide groove, and a base. A position restricting means formed on the surface of the member, which is constituted by a protrusion accommodated in the guide groove or recess;
When the rotating plate-shaped stopper member is rotated, the protrusion of the base member is accommodated in one of the recesses in the rotating plate-shaped stopper member, and is stopped at a position where the rotating plate-shaped stopper member becomes the opening / closing point of the battery lid. It is preferable to have a configuration.

Furthermore, in the portable gas alarm device of the present invention, a notch is formed at the opening edge of the battery insertion port in the casing,
It is preferable that the battery lid has a configuration in which a protruding piece portion to be inserted into the cutout portion is formed.

  Furthermore, in the portable gas alarm device of the present invention, the two columnar batteries are loaded with the positive electrode and the negative electrode facing in opposite directions and connected in series by the power terminal of the battery lid. Can do.

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 the yesterday member for gas detection is arranged in the upper half of the casing. The battery chamber and the sensor mounting part are formed in the lower half, and all necessary components are rationally arranged in the casing, and the sensor mounting part and the battery chamber are arranged side by side. Therefore, the gas alarm device itself can be configured as a small one, and thus excellent portability and high convenience can be obtained.
In addition, since the rotating shaft of the rotating plate stopper member is formed so as not to penetrate the base member, the locking function and the unlocking function for the battery insertion port of the gas alarm device main body by the rotation of the rotating plate stopper member are ensured. Although it is the thing obtained by this, the outstanding waterproofness can be acquired, without using a waterproof seal member for a rotation part.

  Since the battery lid has a position restricting means having a specific configuration, the rotating plate-like stopper member can be securely held in a stable state at a location that is an opening / closing point of the battery lid, and the protrusion of the base member is Since a click feeling can be obtained by being accommodated in any one of the recesses in the rotating plate-like stopper member, it can be recognized that the rotating plate-like stopper member is in an appropriate position.

  Furthermore, according to the portable gas alarm device of the present invention, a notch is formed at the opening edge of the battery insertion port in the casing, and a protruding piece portion inserted into the notch is formed on the battery lid. Therefore, even when the battery cover is attached in a state where the battery is not loaded in the battery chamber, the battery cover can be easily removed.

  Furthermore, since the two batteries loaded in the battery chamber are configured to be connected in series, sufficient electric power required can be ensured.

Furthermore, since the gas sensor has a storage means in which information unique to the gas sensor is recorded, the operating environmental conditions of the gas alarm device body are automatically set according to the attached gas sensor when the gas sensor is attached. Therefore, it is not necessary to perform a complicated operation, 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, thereby performing highly reliable gas detection in accordance with actual environmental conditions. However, it is not necessary to perform complicated operations, 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.
A panel-like protective window member 50 in which switch drive portions 54A, 54B, 54C corresponding to the respective switch elements 49A, 49B, 49C are integrally formed includes a panel-like display mechanism 47, an alarm light-emitting element 48, and The front opening 21 in a state where each of the switch driving portions 54A, 54B, 54C is inserted into the operation portion forming opening 22 of the front casing member 20 so as to cover the entire arrangement area of the switch elements 49A, 49B, 49C. Thus, the display unit 51, the alarm light emitting unit 52, and the 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 concentration of the gas detected at the center position is displayed as a numerical value. 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 and the gas sensor are drawn 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 sensor body 56 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 (the lower end 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 includes a battery receiving portion 13A for receiving, for example, two columnar batteries 14, specifically, AA (AA size) dry batteries arranged side by side. In the state where the battery 14 is loaded in the part 13A with the positive electrode and the negative electrode facing in opposite directions, and the specific battery lid 30 provided with the power terminal 45 on the back surface is housed in the battery insertion port 13B. The two batteries 14 are thus connected in series.
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 shown in FIGS. 14 to 16, the specific battery lid 30 includes a substantially flat base member 31, a rotary plate-like stopper member 36 that is rotatably provided at the center position on the surface side of the base member 31, and A left guide support member 40 and a right guide support member 42, which are fixed to the front surface side of the base member 31 by, for example, ultrasonic welding, and support the rotating plate-like stopper member 36 from the front surface side, and mounted on the back surface of the base member 31. The power supply terminal 45 for short-circuiting is formed by connecting two terminal portions each having a spiral spring shape, for example, and a ring-shaped packing 44 is provided on the side surface of the base member 31.

As shown in FIG. 17, the base member 31 has, for example, a counterbore hole 32 formed at the center position on the surface side. The base member 31 is radially outward from the rotation region of the rotary plate stopper member 36 centered on the counterbore hole 32. Columnar mounting projections 35A and 35B to which the left guide support member 40 is mounted and columnar mounting projections 35C and 35D to which the right guide support member 42 is mounted are formed at the left and right ends located at Has been.
The base member 31 has a pin-like projection 34 formed at a position spaced apart from the counterbore 32 in the radial direction (a lower position in FIG. 17), and the relationship with the formation position of the projection 34. , A rotation restricting stopper 35 having a sectional shape, for example, a fan shape with a central angle of 90 ° is formed.

As shown in FIG. 18, the rotary plate-like stopper member 36 includes a groove 36 </ b> C extending in the radial direction at the center of the surface, a columnar portion 36 </ b> A in which a display portion indicating the rotational drive direction of the rotary plate-like stopper member 36 is formed, And a flange portion 36B protruding outward in the direction of formation of 36C.
On the back surface of the rotary plate-like stopper member 36, a rotary shaft portion 36 </ b> D inserted into the counterbore hole 32 of the base member 31, a recess 37 </ b> A for receiving the rotation restricting stopper 35 of the base member 31, and a protrusion of the base member 31. The position fixing recesses 38A and 38B connected to each other by the arc-shaped guide groove 39 are formed, so that the rotating plate-like stopper member member 36 is connected to the opening / closing point of the battery lid 30. Position restricting means for holding in a stable state at a certain position is configured.
The recess 37A includes an arcuate curved surface formed so that the arcuate outer edge portion of the rotation restricting stopper 35 of the base member 31 is moved while being in contact with the rotation of the rotating plate stopper member 36, and a protrusion. In the state where 34 is inserted into any one of the position fixing recesses, it is defined by a flat locking surface 37B that is locked to any flat surface of the rotation restricting stopper 35.

  As shown in FIG. 19, the left guide support member 40 has a support piece 41 that protrudes inwardly in a state of being fixed to the base member 31. A gap is formed through which the flange portion 36B of the rotary plate-like stopper member 36 is inserted.

The basic structure of the right guide support member 42 is the same as that of the left guide support member 40. As shown in FIG. 20, the support member 43 has a support piece 43 that protrudes inward when fixed to the base member 31. A gap is formed between the back surface of the support piece 43 and the surface of the base member 31 so that the flange portion 36B of the rotary plate stopper member 36 is inserted.
Further, the right guide support member 42 is formed with a position restricting protrusion 42A that protrudes outward from the outer edge position of the base 31 member, and this position restricting protrusion 42A is formed on the battery insertion port 13B in the casing 11. It is inserted into a notch 13C formed in the opening edge portion.

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. 21, the protect cover 70 has a mounting portion 71 having a shape that fits the shape of a part of the outer surface of the casing 11 of the gas alarm device main body 10A 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 be maintained in an appropriate operating state.

  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, in a state where two AA batteries 14 are loaded in the battery chamber 13, the battery lid 30 is attached to the battery insertion port 13 </ b> B in the casing 11. Specifically, the two flange portions 36 </ b> B of the rotary plate-like stopper member 36 are formed between the support piece 41 and the base member 31 in the left guide support member 40 and the support piece 43 in the right guide support member 42. In other words, the protrusion 34 in the base member 31 is accommodated in one recess in the rotary plate stopper member 36, that is, a position fixing recess 38A positioned in the upper direction in FIG. The battery lid 30 is mounted in a state where the protrusion 42A for position regulation is aligned with the cutout portion 13C of the casing so that the whole is accommodated in the battery insertion port 13B, and then the rotating plate stopper member By rotating 36 clockwise, the two flange portions 36B of the rotary plate-like stopper member 36 are locked to the opening edge of the battery insertion port 13B, ie, The protrusion 34 of the support member 31 is accommodated in the other recess of the rotary plate-like stopper member 36 via the guide groove 39, that is, the position fixing recess 38B positioned on the right side in FIG. One flat surface (the flat surface facing left in FIG. 17) of the stopper 35 is locked to the locking surface 37 </ b> B, thereby locking the battery lid 30 with respect to the casing 11.
In addition, the gas sensor 55 selected according to the purpose is attached to the gas sensor attachment portion 15 of the gas alarm device main body 10A, and the gas alarm device is operated by operating the first operation button 53A in a state where the battery 14 and the gas sensor 55 are attached. When the main body 10A is in the operating state, the gas sensor 55, the panel-like display mechanism 47, and other parts are in the operating state, and the gas alarm device main body is determined by information unique to the gas sensor 55 recorded in the memory of the sensor substrate 57 in the gas sensor 55. The operating environment condition of 10A is automatically set according to the attached 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 release the lock by the engaging portion of the sleeve member 16, the gas sensor 55 is pulled down, and the other gas sensors are connected to the gas alarm device. By mounting on the sensor mounting portion 15 of the main body 10A, the operating environment conditions and temperature compensation conditions of the gas alarm device main body 10A are automatically set according to the replaced gas sensor based on information unique to the gas sensor. The gas detection operation is enabled by setting.

  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 necessary components are rationally arranged in the casing 11, the gas alarm is provided. The device 10 itself can be configured as a small one, and thus excellent portability and high convenience can be obtained.
Moreover, in the gas alarm device 10, (1) the casing 11 is connected via the ring-shaped packing 25 in which the front casing member 20 and the rear casing member 12 are disposed over the entire circumference of these contact surfaces. (2) the ring-shaped packing 68 is interposed between the inner surface of the sensor mounting portion 15 of the gas alarm device main body 10A and the outer peripheral surface of the holder member 61 associated with the gas sensor 55, and (3) the battery. Since the ring-shaped packing 44 is attached to the side surface of the lid 30, a sufficiently reliable waterproof structure is formed, and the rotating shaft portion of the rotating plate stopper member 36 constituting the battery lid 30. Since 36D is formed so as not to penetrate the base member 31, the electric power of the gas alarm device main body 10A due to the rotation of the rotating plate-like stopper member 36 can be reduced. Yet those configurations locking and unlocking function to the insertion opening 13B can be surely obtained, without the use of waterproof seal member to the rotating part, it is possible to obtain an excellent waterproof property.
Accordingly, it is possible to reliably prevent water from entering the gas alarm device main body 10A from the outside. For example, the gas alarm device main body 10A performs gas detection in an environment where water may enter from the outside. As extremely useful.

  Further, since the battery lid 30 has a position restricting means having a specific configuration, the rotating plate-like stopper member 36 can be reliably held in a stable state at a location that is an opening / closing point of the battery lid 30 and the base member. Since the protruding portion 34 of 31 is accommodated in one of the position fixing recesses 38A and 38B of the rotary plate-like stopper member 36, a click feeling can be obtained, so that the rotary plate-like stopper member 36 is at an appropriate position. You can recognize that there is.

  Further, a notch 13C is formed at the opening edge of the battery insertion port 13B in the casing 11, and a position restricting protrusion 42A to be inserted into the notch 13C is formed on the side surface of the battery lid 30. Thus, even when the battery cover 30 is mounted in a state where the battery 14 is not loaded in the battery chamber 13, the battery cover 30 can be easily removed.

  Furthermore, since the two batteries 14 loaded in the battery chamber 13 are connected in series, a sufficiently large amount of electric power required can be ensured.

  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.

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.
Further, for example, as shown in FIG. 22, one end has a sensor mounting portion 82 having the same configuration as the sensor mounting portion 15 of the gas alarm device main body 10A, and the other end is mounted on the sensor mounting portion 15 of the gas alarm device main body 10A. 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 a battery cover. It is a rear view of the battery cover shown in FIG. It is a right view of the battery cover shown in FIG. It is a front view which shows the structure of the base member which comprises a battery cover. It is explanatory drawing which shows the structure of the rotating plate-shaped stopper member which comprises a battery cover, Comprising: (A) Front view, (B) Rear view, (C) It is sectional drawing in aa of (A). It is explanatory drawing which shows the structure of the left side guide support member which comprises a battery cover, Comprising: It is sectional drawing in bb of (A) front view, (B) rear view, (C) (A). It is explanatory drawing which shows the structure of the right side guide support member which comprises a battery cover, Comprising: (A) Front view, (B) Rear view, (C) It is sectional drawing in cc of (A). 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 Visual opening 20 Front casing member 21 Front opening 22 Operation part formation opening 23 Reinforcement member 25 Ring-shaped packing 26 Contact surface 28 Infrared communication port 30 Battery cover 31 Base member 32 Counterbore hole 34 Projection 35 Rotation restricting stopper 35A, 35B, 35C, 35D Mounting projection 36 Rotating plate-shaped stopper member 36A Column-shaped portion 36B Gutter portion 36C Groove 36D Rotating shaft portion 37A Recess 37B Locking surface 38A, 38B Recess 39 Inner groove 40 Left guide support member 41 Support piece 42 Right guide support member 42A Position restricting projection piece 43 Support piece 44 Ring-shaped packing 45 Power supply terminal 46A Display board 46B Power supply board 46C CPU board 47 Panel display mechanism 48 Light emission for alarm Element 49A, 49B, 49C Switch element 50 Protective window member 51 Display unit 52 Alarm light emitting unit 53 Operation unit 53A First operation button 53B Second operation button 53C Third operation button 54A, 54B, 54C Switch drive 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 74 Gassen Opening portion for mounting 75 Battery opening for inserting battery 76 Opening portion for exposing infrared communication port 80 Remote cable 82 Sensor mounting portion 85 Mounted portion

Claims (6)

A battery having a box-shaped casing that can be held and held by a hand, a functional member relating to a gas detection operation disposed in the upper half of the casing, and an opening in the lower half of the casing below the casing It is composed of a battery chamber having an insertion port and a gas alarm device body formed by arranging the sensor mounting portion side by side on the left and right, and a gas sensor detachably mounted on the sensor mounting portion of the gas alarm device body,
In the battery chamber, two columnar batteries are received in a state where they are arranged side by side, and a battery lid having a power terminal on the back surface and ring packing on the side surface is housed in the battery insertion slot. It is installed in the state that has been
Battery cover includes a base member which is countersunk hole formed in the surface, and a rotation plate stopper member provided rotatably on the surface side of the base member, the rotary plate stopper member has its rear surface The portable gas alarm device is provided so that it can be rotated without penetrating the base member by inserting the rotating shaft portion formed in the base member into the counterbore hole of the base member. The battery lid includes an arcuate guide groove formed on the back surface of the rotating plate stopper member, two recesses connected to each other by the guide groove, and the guide groove or recess formed on the surface of the base member. Having a position regulating means constituted by a protrusion accommodated in a place,
By rotating the rotating plate-like stopper member, the protrusion of the base member is accommodated in one of the recesses of the rotating plate-like stopper member, and is stopped at a position where the rotating plate-like stopper member becomes the opening / closing point of the battery lid. Portable gas detector according to claim 1, characterized in that that. At the opening edge of the battery insertion opening in the casing, a notch is formed,
The portable gas alarm device according to claim 1 or 2 , wherein the battery lid is formed with a protruding piece portion to be inserted into the cutout portion . The two columnar batteries are loaded in a state where the positive electrode and the negative electrode are opposite to each other, and are connected in series by a power supply terminal of the battery lid. Portable gas alarm. The sensor mounting portion in the gas alarm device main 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. And
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.