JP3790228B2 - Portable gas detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable gas detector.
[0002]
[Prior art]
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.
[0003]
From such a request, various types of portable gas detectors have been proposed so far. In these portable gas detectors, primary batteries such as dry batteries or secondary batteries (rechargeable batteries) are usually used. Is used as a power source for driving.
For example, a battery loading chamber in which a dry battery (primary battery) is mounted is formed in the gas detector body, and a battery loading chamber cover member is detachably attached to the rear end opening of the battery loading chamber. Is known to be replaceable (see, for example, Patent Document 1).
[0004]
Thus, in recent years, since awareness of environmental conservation has increased, it has been desired to reduce the use of dry batteries as much as possible. For example, a secondary battery is built in as a driving power source and performs a charging operation. Has been proposed that can be used repeatedly. Such portable gas detectors are often configured to require accessories such as an adapter attached to the gas detector when using a dry cell.
[0005]
In general, when a portable gas detector is used in an environment where there is a risk of ignition, a current limiting element such as a resistor or a posistor is usually provided between the driving power source and the sensor or signal processing circuit. Intrinsically safe explosion-proof measures have been taken to supply power in a state where ignition to flammable gas is prevented as much as possible even by a short circuit in the sensor or signal processing circuit by inserting it, etc. Since a large amount of power is required when performing gas detection, it is possible to use a primary battery when the amount of power of the secondary battery decreases, or to use a secondary battery and a primary battery in combination. There are many cases where it is required.
[0006]
However, in the case where the secondary battery as described above is built in as a power source for driving, it is not only possible to use a dry battery unless an accessory such as an adapter is always carried with it. The gas detector itself is bulky, and the convenience is reduced.
[0007]
[Patent Document 1]
JP 07-146269 A
[0008]
[Problems to be solved by the invention]
The present invention has been made on the basis of the circumstances as described above, and the object thereof is easy to configure as a small and convenient to carry, high convenience in use, and an adapter or the like. It is an object of the present invention to provide a portable gas detector having a novel configuration capable of using both a dry battery and a rechargeable battery without using any accessory.
[0009]
[Means for Solving the Problems]
  The portable gas detector of the present invention has a long and narrow shape that can be held and held by hand, and includes a casing having a gas sampling opening formed at the tip.
  In the casing, a gas detection mechanism and a display mechanism are disposed in the front end region, and two cylindrical dry batteries and a rechargeable battery having the same outer shape as the dry cell in the rear end region. A battery loading chamber is formed in which any one of the rechargeable battery package power sources integrally formed by being held by the holding frame member in a state where the two are arranged in parallel is inserted and mounted in a replaceable manner with the other. And
  In the battery loading chamber, a receiving support portion that conforms to the outer shape of the cross section of the dry cell is formed to support each dry cell in contact with a part of its outer periphery,
  The rechargeable battery package power supply has a cross-sectional shape that matches the internal space in a cross section orthogonal to the longitudinal direction of the battery loading chamber.Is,
  A charging terminal is arranged on the back of the casing,
  In the battery loading chamber, the contact for the dry battery and the contact for the rechargeable battery package power source are separately formed,
  The holding frame member constituting the rechargeable battery package power source is connected to one end in the longitudinal direction, one end of which is connected to the positive side contact of one rechargeable battery and the negative side contact of the other rechargeable battery. A terminal arrangement terminal block on which two connection terminal contact pieces are arranged is formed so as to extend in the longitudinal direction from the outer peripheral surface position of the rechargeable battery so as to protrude radially outward of the rechargeable battery. IsIt is characterized by that.
[0010]
  In the portable gas detector of the present invention,In the casing, a circuit board on which a first power supply circuit using a dry battery and a second power supply circuit using a rechargeable battery package power source are formed is disposed.
  The battery loading chamber is formed with a guide groove that extends inward in the longitudinal direction from the opening edge of the rear end opening and accommodates the terminal block for terminal arrangement in the rechargeable battery package power source. A rechargeable battery package power supply connection piece connected to the second power supply circuit on the substrate is exposed in the internal space of the battery loading chamber.It is preferable to be configured.
[0011]
  In the portable gas detector of the present invention,The holding frame member constituting the rechargeable battery package power source is a space formed by a rectangular frame-shaped circumscribed edge in which two rechargeable batteries are inscribed and an outer peripheral edge of the rechargeable battery in a cross section orthogonal to the longitudinal direction. A frame portion positioned at the portion, and the frame portion is positioned along the receiving support portion in the battery loading chamber.It is preferable to be configured.
[0013]
Further, in the portable gas detector of the present invention, a battery loading chamber cover is detachably provided at the rear end opening of the casing, and the inner surface of the battery chamber cover has one side corresponding to each dry cell. It is preferable that the contact piece for connecting a dry cell is provided.
Moreover, it is preferable that the contact piece for connecting a dry cell is made of a spring-like spring material.
[0014]
The portable gas detector of the present invention described above is configured to include an alarm notification mechanism that issues an alarm when the detected concentration of the detection target gas exceeds a certain reference value. preferable.
[0015]
[Action]
According to the portable gas detector having the above configuration, basically, the casing has a form that can be held and held, and all of the necessary components are dead space in the casing. Is reasonably arranged in a state where it is as small as possible, so that the gas detector itself can be made smaller and lighter while ensuring the necessary functions, and therefore excellent portable And high convenience can be obtained.
In addition, a receiving support portion that conforms to the outer shape of the transverse cross section of the dry cell is formed in the battery loading chamber, and the cross sectional shape in which the rechargeable battery package power source matches the shape of the space portion in the cross section perpendicular to the longitudinal direction of the battery loading chamber By having a battery or rechargeable battery package power supply is installed in the proper position and sufficient electrical connection with the corresponding contact is achieved, without using accessories such as adapters Both dry and rechargeable batteries can be used.
[0016]
In addition, a charging terminal connected to a charging circuit including a package power supply connection piece is disposed on the back surface of the casing, and a contact for connecting a dry battery and a contact for connecting a rechargeable battery are separately provided in the battery loading chamber. As a result, the charging operation can be performed with the rechargeable battery package power supply mounted in the battery loading chamber, and if the dry cell is mounted in the battery loading chamber, the dry battery can be used. Since it is not connected to the rechargeable battery package power supply contact point, even if the gas detector is accidentally attached to an appropriate charging device with the dry battery attached, the battery is charged. Therefore, the gas detector can be configured as highly safe.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
The portable gas detector of the present invention has an elongated shape that is sized to be held and held by hand, for example, two AAA batteries (AAA size (ANSI standard)), and the same as the dry batteries. Of a rechargeable battery package power source (hereinafter simply referred to as a “package power source”) that is integrally configured by being held by a holding frame member in a state in which two rechargeable batteries (storage batteries) having an outer shape of Either one is inserted into a common battery loading chamber so as to be exchangeable with the other, and used.
In the following, first, the package power source used in the portable gas detector of the present invention will be described.
[0018]
1 is an exploded perspective view showing a configuration of an example of a package power supply, FIG. 2 is a plan view of the package power supply shown in FIG. 1, and FIG. 3 is a longitudinal sectional view taken along line AA in FIG. FIGS. 4A and 4B are longitudinal sectional views taken along the line BB in FIG. 2, and FIG. 4A is a rear view of the package power supply, FIG. 4B is a front view of the package power supply, and FIG. The cross-sectional view of CC section in 2 is shown, respectively.
[0019]
  As described above, the package power supply 10 is integrally formed by being held by the holding frame member 12 in a state where the two rechargeable batteries 13 and 14 are arranged in parallel.
  The holding frame member 12 constituting the package power supply 10 is made of, for example, resin, and the two rechargeable batteries 13 and 14 are inscribed in a cross section orthogonal to the longitudinal direction.Rectangular frameIt has frame portions 11, 11, 11, 11, and 11 located in a space formed by a circumscribing edge and outer peripheral edges of the rechargeable batteries 13 and 14 (see FIG. 4C), and is loaded with batteries. It has a cross-sectional shape that matches the shape of the space portion in the cross-section orthogonal to the longitudinal direction of the chamber.
  The two rechargeable batteries 13 and 14 have the frame portions 11, 11, 11, 11, 11 of the holding frame member 12 in a state where the positive contacts 13 A, 14 A and the negative contacts 13 B, 14 B are inverted. Each of them is supported in series and connected in series by a connecting contact piece 17 disposed on the inner end face on one end side of the holding frame member 12 in the longitudinal direction of the rechargeable batteries 13 and 14.
  The holding frame member 12 in this example is formed by integrally joining the front surface side frame member 12A and the back surface side frame member 12B, and holds each of the rechargeable batteries 13 and 14 with a part of the outer periphery thereof exposed.
[0020]
A contact arrangement terminal projecting radially outward from the outer peripheral surface position of the rechargeable batteries 13 and 14 and extending in the longitudinal direction at the outer peripheral surface position of each of the rechargeable batteries 13 and 14 on the other end side of the package power supply 10. The bases 15 and 15 are formed, and the connection terminal contact pieces 16 and 16 are respectively connected to the positive electrode side contact 13A of the one rechargeable battery 13 or the other rechargeable. The battery 14 is disposed in a state of being connected to the negative electrode side contact 14 </ b> B.
[0021]
Hereinafter, the portable gas detector will be described.
FIG. 5 is a plan view showing the appearance of an example of the portable gas detector of the present invention, FIG. 6 is a longitudinal sectional view of the DD cross section in FIG. 5, and FIG. 7 is a diagram showing a dry battery mounted in the battery loading chamber. 5 is a vertical cross-sectional view of the EE cross section in FIG. 5, and FIG. 8 is a vertical cross-sectional view of the EE cross section in FIG. 5 when the rechargeable battery package power supply is mounted in the battery loading chamber.
As described above, the portable gas detector (hereinafter simply referred to as “gas detector”) 20 includes a rectangular parallelepiped casing 21 sized to be held and held by hand. 21 has a gas collection opening 21A formed at the front end and a rear end opening 21B into which the dry batteries 30, 30 or the package power supply 10 are inserted at the rear end.
[0022]
A flat circuit board 22 is disposed in the casing 21 so as to extend in the longitudinal direction of the casing 21.
In the casing 21, a gas detection mechanism 23 including a gas sensor 23 </ b> A provided opposite to the gas sampling opening 21 </ b> A in a front end region on the surface side of the circuit board 22, a display for displaying the detected concentration of the detection target gas The mechanism 24 is provided with an alarm notification mechanism that issues an alarm when the detected gas concentration exceeds a certain reference value, and two dry batteries 30, 30, In addition, a battery loading chamber 25 is formed in which any one of the package power supplies 10 is inserted so as to be exchangeable with the other.
[0023]
5 to 8, 35A is a first operation button, 35B is a second operation button for function adjustment, and 24A is a display for displaying a gas concentration value detected by the gas detection mechanism and other information. Part 21D is a metal band provided over the entire circumference of the casing 21, and the surface area of the continuous resin portion is regulated to a certain size or less by the metal band 21D and has a charge amount enough to ignite combustible gas. The structure prevents static electricity from being generated.
Reference numeral 31 denotes a flat control circuit board on which various necessary functional elements provided so as to extend in the longitudinal direction along the circuit board 22 are mounted. The control circuit board 31 allows the gas detection mechanism 23 to be mounted. The operations of the display mechanism 24, the alarm notification mechanism, and other operation mechanisms are controlled. Reference numerals 32 and 33 denote an alarm buzzer and an alarm vibration generator that constitute an alarm notification mechanism disposed on the back surface of the control circuit board 31. The alarm buzzer and the alarm generate a warning by a buzzer sound and vibration, respectively.
Reference numeral 34 denotes a filter unit including a filter 34 </ b> A provided to close the gas collection opening 21 </ b> A in the casing 21.
[0024]
In the battery loading chamber 25, as shown in FIGS. 9 and 10, a receiving support portion 26 that conforms to the outer shape of the dry batteries 30 and 30 is formed so as to extend in the longitudinal direction of the casing 21. The receiving support portion 26 supports a battery support surface 27 that supports two dry batteries 30 and 30 in contact with a part of the outer periphery, specifically, the upper surface, the lower surface, and both side surfaces of the outer periphery of each of the dry batteries 30 and 30. Have.
[0025]
The partition wall 25A on the front end side that partitions the battery loading chamber 25 is connected to the circuit board 22 through the connection contact piece 40A at a position corresponding to each dry battery holding space formed by the receiving support portion. For example, one of the contact pieces 40, 40 made of a spring-like spring material is disposed in an exposed state in the internal space of the battery loading chamber 25.
[0026]
A battery loading chamber cover 36 is provided in the rear end opening 21B of the casing 21 so as to be detachable by, for example, a mounting screw 36A, and one dry battery connecting contact piece 40, 40 is provided on the inner surface of the battery loading chamber cover 36. The other dry battery connecting contact pieces 41, 41 made of, for example, a spring-like spring material are provided in a state of being connected to each other.
A guide plate 42 made of resin, for example, connects the other dry battery connection contacts 41 and 41 to the tip portions of the other dry battery connection contacts 41 and 41 with the tips exposed on the surface. Is provided.
[0027]
The spring-shaped spring material constituting one of the dry battery connection contacts 40, 40 and the other dry battery connection contact 41, 41 is displaced by the size of the excessive dimension in the longitudinal direction of the package power supply 10 with respect to the dry battery 30. There is no particular limitation as long as it has an absorbable configuration.
[0028]
As shown in FIGS. 11 and 12, the package power supply positive contact pieces 45A and 45B for connecting the package power supply and the positions corresponding to the positive contact and the negative contact of the package power supply 10 are disposed on the back surface of the circuit board 22, as shown in FIGS. The package power source connecting negative electrode side contact piece 46 is mounted, and the charging terminal connecting positive electrode side contact piece 51A and the charging terminal connecting negative electrode side contact piece 51B are respectively connected to the package power source connecting positive electrode side contact piece 45A. 45B and the package power supply connecting negative electrode side contact piece 46 are arranged in the longitudinal direction, whereby a power supply circuit 60 by the package power supply 10 and a charge circuit 61 for the package power supply 10 are formed. .
The power supply circuit portion for various functional elements such as the control circuit board 31 disposed on the front end side of the circuit board 22 in the power supply circuit 60 by the package power supply 10 is a power supply circuit by dry batteries 30 and 30 (not shown). And is common.
[0029]
A package power supply 10 that extends in the longitudinal direction of the casing 21 from the opening edge of the rear end opening 21B is provided on the partition wall 25B (the lower partition wall in FIGS. 7 and 8) on the circuit board arrangement side that partitions the battery loading chamber 25. The guide grooves 25C and 25C in which the contact piece placement terminal blocks 15 and 15 are accommodated include the positive electrode side contact pieces 45A and 45B for connecting the package power source and the negative electrode side contact piece 46 for connecting the package power source to the battery loading chamber. It is formed in a state where it is exposed to the internal space 25, and thereby, the contact for the dry battery and the contact for the package power source are formed separately.
[0030]
When the package power supply 10 is mounted in the battery loading chamber 25 on the back surface of the casing 21, a charging terminal 50 is disposed at a position facing the connection contact piece placement terminal blocks 15, 15 via the circuit board 22. As shown in FIG. 13, the charging terminal 50 includes a charging terminal connecting positive electrode side contact piece 51A and a charging terminal connecting negative electrode side contact piece 51B on the circuit board 22, respectively. It is connected.
[0031]
As described above, the gas detector 20 having the above-described configuration is configured such that, for example, two AAA type batteries 30 and 30 are inserted into the battery loading chamber 25 with the positive electrode side contact and the negative electrode side contact being inverted with respect to each other. In the state supported by the battery support surface 27 in the portion 26, a battery loading chamber cover 36 is provided, whereby the two dry batteries 30, 30 are connected to one dry battery connection contact 40 and the other dry battery, respectively. It is mounted in a state of being connected in series by the connection contact piece 41.
In this case, each of the dry batteries 30 and 30 is not connected to the package power source contact exposed in the internal space of the battery loading chamber 25. As a result, even when the dry batteries 30 and 30 are mounted, the dry batteries 30 and 30 are not charged even if the gas detector 20 is erroneously mounted to an appropriate charging device. , Without incurring unforeseen circumstances.
[0032]
  Further, as described above, the gas detector 20 having the above-described configuration can be used by inserting the entire package power supply 10 into the battery loading chamber 25 common to the dry batteries 30 and 30.
  Specifically, the package power supply 10 is inserted in such a manner that the contact piece placement terminal block 15 is positioned rearward with respect to the insertion direction, and each of the contact placement terminal blocks 15 and 15 is inserted into the battery loading chamber 25. And the exposed outer peripheral surface portions of the rechargeable batteries 13 and 14 are accommodated in the corresponding guide grooves 25C and 25C.Receiving support part 26In the state of being supported by the battery support surface 27, the battery loading chamber cover 36 is attached, whereby the positive side contact and the negative side contact of the package power source 10 are connected to the positive side contact piece 45A for connecting the package power source on the circuit board 25, 45B and the package power supply connecting negative electrode side contact piece 46 are mounted in a connected state.
  In this case, since the contacts of the rechargeable batteries 13 and 14 themselves in the package power supply 10 are covered with the holding frame member 12 having electrical insulation, they are not connected to the dry battery contacts. It is said.
[0033]
In the above, as the gas sensor 23A constituting the gas detection mechanism 23, for example, a contact combustion type gas sensor can be exemplified, and the type of detection target gas is not particularly limited, and LPG, city gas, methane gas, Hydrogen gas, ethylene gas, acetylene gas, gasoline and other combustible gases can be exemplified.
[0034]
The operation of the gas detector 20 will be described.
When the gas detector 20 is operated by operating the first operation button 35A with the dry batteries 30, 30 or the package power supply 10 loaded in the battery loading chamber 25, the gas detection mechanism 23 and the display mechanism 24 are operated. It becomes. In this state, air in the environmental atmosphere diffuses to reach the gas sensor 23A, the concentration of the target gas is detected, and the result is displayed on the display unit 24A by the display mechanism 24.
[0035]
The concentration of the detection target gas detected by the gas sensor 23A is sent to the control circuit board 31 as a current signal or a voltage signal for processing, whereby the concentration of the detection target gas exceeds the reference value set for the gas. When an alarm signal is generated, an alarm operation signal is issued, thereby driving the alarm notification mechanism and generating an alarm. In the illustrated example, an alarm is generated by the buzzer sound generated by the alarm buzzer 32 and the vibration generated by the alarm vibration generator 33.
As described above, when a plurality of types of alarm notification mechanisms are provided, it is not necessary that all of them be driven at the same time, and a cyclic alarm in which each alarm notification mechanism is sequentially driven for a predetermined time. It is preferable that the operation is performed, and according to such drive control, it is possible to suppress the consumption of the drive power supply (dry battery or rechargeable battery) as compared to the case where the drive is performed all at once.
[0036]
The gas detector 20 is mounted by an appropriate mounting member, for example, so that the gas detector 20 is transported together with the body by the person. Therefore, the environmental atmosphere of the person is, for example, a high concentration of dangerous gas When a dangerous state is reached, this is notified by the display on the display unit 24A, the sounding of the alarm buzzer 32, and the operation of the alarm vibration generator 33. Therefore, the person can immediately take notice or take appropriate protective measures, or can take measures such as evacuation from the place.
[0037]
Thus, according to the portable gas detector 20 of the present invention, basically, the casing 21 has a form that can be held by hand, and all the necessary components are included. Since the dead space in the casing 21 is rationally arranged as small as possible, the gas detector 20 itself should be small and lightweight while ensuring the necessary functions. Therefore, excellent portability and high convenience can be obtained.
Moreover, a receiving support portion 26 that conforms to the outer shape of the cross section of the dry batteries 30, 30 is formed in the battery loading chamber 25, and the package power source 10 has a shape of a space portion in a cross section perpendicular to the longitudinal direction of the battery loading chamber 25. By having a suitable cross-sectional shape, the battery 30, 30 or the package power supply 10 is mounted in the proper position and sufficient electrical connection with the corresponding contact is achieved, so use accessories such as adapters Both dry batteries and rechargeable batteries can be used without.
[0038]
When the package power supply 10 is used as a drive power supply, the package power supply 10 is connected to the contact placement terminal blocks 15 and 15 formed so that the positive and negative contacts protrude on the outer surface. 16 and 16 are arranged, and the contact piece arrangement terminal blocks 15 and 15 are accommodated in the guide grooves 25C in the battery loading chamber 25 to form a power feeding structure, thereby providing a package. Even when the power supply 10 is inserted into the battery loading chamber 25 in an incorrect posture, the package power supply 10 is mounted in the opposite direction because the guide groove 25C prohibits further insertion of the package power supply 10. This can be prevented.
[0039]
In addition, the charging terminal 50 is disposed on the back surface of the casing 21, and the contact for the dry battery and the contact for the package power source are separately formed in the battery loading chamber 25, so that the package power source 10 is loaded with the battery. The charging operation can be performed while the battery is mounted in the chamber 25. Moreover, when the batteries 30 and 30 are mounted in the battery loading chamber 25, the batteries 30 and 30 are not connected to the contact points for the package power supply. Therefore, even if the gas detector 20 is accidentally attached to an appropriate charging device while the dry batteries 30 and 30 are still attached, the dry batteries 30 and 30 may be charged. Therefore, the gas detector 20 can be configured to have high safety.
In addition, the package power source 10 is configured integrally by holding two rechargeable batteries by a holding frame member, and the positive electrode side contact and the negative electrode side contact are formed so as to protrude on the outer surface. By attaching the power supply 10 itself to an appropriate charging device, the charging operation can be performed independently.
[0040]
Since the battery chamber cover 36 is detachably provided by the attachment screw 36A, the batteries 30 and 30 and the package power source can be replaced very easily.
[0041]
In addition, since one dry battery connection piece 40 and the other dry battery connection piece 41 are formed of a spring-like spring material, the size of the package power supply 10 with respect to the excessive dimension in the longitudinal direction of the dry battery 30 is displaced. As a result, the dry battery 30 and the package power supply 10 can be mounted at an appropriate position in the battery loading chamber 25 to achieve sufficient electrical connection.
[0042]
As mentioned above, although embodiment of this invention was described, this invention is not limited to said aspect, A various change can be added.
For example, in the casing of the gas detector, a gas detection mechanism and a display mechanism may be disposed in the front end side region, and a battery loading chamber may be formed in the rear end side region, and the arrangement of other members is arbitrary. . Further, the dry battery used as the driving power source is not limited to the AAA type.
Furthermore, the gas detector may be used while being held in the hand, or may be used directly on a person's body using an appropriate wearing member or attached to a person's clothes. Examples of the member include a clip and a pin. Depending on the form, the mounting member may be formed integrally with the casing. Further, the mounting member can be configured to be easily replaceable.
[0043]
【The invention's effect】
According to the portable gas detector of the present invention, basically, the casing has a form that can be held and held, and all the necessary components are dead space in the casing. Is reasonably arranged in a state where it is as small as possible, so that the gas detector itself can be made smaller and lighter while ensuring the necessary functions, and therefore excellent portable And high convenience can be obtained.
In addition, a receiving support portion that conforms to the outer shape of the cross section of the dry cell is formed in the battery loading chamber, and the cross-sectional shape in which the rechargeable battery package power source conforms to the shape of the space in the cross section orthogonal to the longitudinal direction of the battery loading chamber. By having a battery or rechargeable battery package power supply is installed in the proper position and sufficient electrical connection with the corresponding contact is achieved, without using accessories such as adapters Both dry and rechargeable batteries can be used.
[0044]
When a rechargeable battery package power supply is used as a drive power supply, the rechargeable battery package power supply is connected to a contact piece arrangement terminal block formed by projecting the positive electrode side contact and the negative electrode side contact on the outer surface. A terminal contact piece is arranged, and this contact piece arrangement terminal block is housed in a guide groove in the battery loading chamber to form a power feeding structure. Even if the battery is inserted into the battery loading chamber in the wrong posture, the guide groove prevents further insertion of the rechargeable battery package power supply, so the rechargeable battery package power supply is mounted in the reverse direction. This can be prevented.
[0045]
In addition, the charging terminal is disposed on the back surface of the casing, and the dry battery connection contact and the rechargeable battery connection contact are separately formed in the battery loading chamber, so that the rechargeable battery package power supply is connected to the battery. Charging operation can be performed with the battery mounted in the loading chamber, and when the dry battery is mounted in the battery loading chamber, the dry battery is disconnected from the contact for the rechargeable battery package power supply. Even if the gas detector is accidentally attached to an appropriate charging device with the dry cell attached, the dry cell will not be charged, thus making the gas detector highly safe It can comprise as what has property.
[0046]
In addition, the rechargeable battery package power source is configured integrally by holding the two rechargeable batteries by the holding frame member, and the positive electrode side contact and the negative electrode side contact are formed to protrude on the outer surface. The rechargeable battery package power supply itself can be mounted on an appropriate charging device to perform a charging operation alone.
[0047]
Since the battery chamber cover is detachably provided, it is possible to very easily exchange the dry battery and the rechargeable battery package power source.
[0048]
In addition, since the contact piece for connecting the dry battery is made of a spring-like spring material, the size of the excessive dimension in the longitudinal direction of the rechargeable battery package power supply with respect to the dry battery is absorbed by the displacement, and either the dry battery or the package power supply Even so, it can be mounted at an appropriate position in the battery loading chamber, and sufficient electrical connection can be achieved.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a rechargeable battery package power source.
FIG. 2 is a plan view of a rechargeable battery package power supply.
3A is a vertical cross-sectional view showing the AA cross section in FIG. 2, and FIG. 3B is a vertical cross-sectional view showing the BB cross section in FIG.
4A is a rear view of the rechargeable battery package power source shown in FIG. 2, FIG. 4B is a front view of the rechargeable battery package power source shown in FIG. 2, and FIG. It is a cross-sectional view in a -C cross section.
FIG. 5 is a plan view showing an appearance of an example of a portable gas detector according to the present invention.
6 is a longitudinal sectional view taken along the line DD in FIG. 5. FIG.
7 is a vertical cross-sectional view of the EE cross section in FIG. 5 when a dry cell is installed in the battery loading chamber. FIG.
8 is a vertical cross-sectional view of the EE cross section in FIG. 5 when the rechargeable battery package power supply is mounted in the battery loading chamber. FIG.
FIG. 9 is a rear view of the battery loading chamber when a dry battery is installed.
FIG. 10 is a rear view of a battery loading chamber when a rechargeable battery package power supply is mounted.
FIG. 11 is a plan view showing the back surface of the circuit board.
12 is a longitudinal sectional view taken along the line XX in FIG.
FIG. 13 is an enlarged sectional view showing a connection state between a charging terminal and a charging terminal contact piece on a circuit board.
[Explanation of symbols]
10 Rechargeable battery package power supply
11 Frame part
12 Holding frame member
12A Front side frame member
12B Back frame member
13,14 Rechargeable battery
13A, 14A Positive contact
13B, 14B Negative contact
15 Contact block terminal block
16 Contact piece
17 Connection piece
20 Portable gas detector
21 Casing
21A Gas sampling opening
21B Rear end opening
21D metal strip
22 Circuit board
23 Gas detection mechanism
23A Gas sensor
24 display mechanism
24A Gas display
25 Battery compartment
25A division wall
25B division wall
25C guide groove
26 Receiving support part
27 Battery support surface
30 batteries
31 Control circuit board
32 Alarm buzzer
33 Alarm vibration generator
34 Filter unit
34A filter
35A First operation button
35B Second operation button for function adjustment
36 Battery compartment cover
36A Mounting screw
40 One battery connection piece
40A connection piece
41 The other battery connection piece
42 Guide plate
45A Positive electrode side contact for package power supply
45B Positive contact for package power supply
46 Negative side contact for package power supply
50 Charging terminal
51A Positive terminal for connecting terminal for charging
51B Negative terminal for charging terminal connection
60 Power supply circuit
61 Charging circuit

Claims (6)

It has a long and narrow shape that can be held and held by hand, and has a casing with a gas sampling opening formed at the tip.
In the casing, a gas detection mechanism and a display mechanism are disposed in the front end region, and two cylindrical dry batteries and a rechargeable battery having the same outer shape as the dry cell in the rear end region. A battery loading chamber is formed in which any one of the rechargeable battery package power sources integrally formed by being held by the holding frame member in a state where the two are arranged in parallel is inserted and mounted in a replaceable manner with the other. And
In the battery loading chamber, a receiving support portion that conforms to the outer shape of the cross section of the dry cell is formed to support each dry cell in contact with a part of its outer periphery,
The rechargeable battery package power source has a cross-sectional shape that matches the internal space in the cross section perpendicular to the longitudinal direction of the battery loading chamber ,
A charging terminal is arranged on the back of the casing,
In the battery loading chamber, the contact for the dry battery and the contact for the rechargeable battery package power source are separately formed,
The holding frame member constituting the rechargeable battery package power source is connected to one end in the longitudinal direction, one end of which is connected to the positive side contact of one rechargeable battery and the negative side contact of the other rechargeable battery. A terminal arrangement terminal block on which two connection terminal contact pieces are arranged is formed so as to extend in the longitudinal direction from the outer peripheral surface position of the rechargeable battery so as to protrude radially outward of the rechargeable battery. portable gas detector, characterized in that it. In the casing, a circuit board on which a first power supply circuit using a dry battery and a second power supply circuit using a rechargeable battery package power source are formed is disposed.
The battery loading chamber is formed with a guide groove that extends inward in the longitudinal direction from the opening edge of the rear end opening and accommodates the terminal block for terminal arrangement in the rechargeable battery package power source. The portable gas detector according to claim 1, wherein a contact piece for connecting a rechargeable battery package connected to a second power supply circuit on the substrate is exposed in an internal space of the battery loading chamber . The holding frame member constituting the rechargeable battery package power source is a space formed by a rectangular frame-shaped circumscribed edge in which two rechargeable batteries are inscribed and an outer peripheral edge of the rechargeable battery in a cross section orthogonal to the longitudinal direction. The portable gas detector according to claim 1, wherein the portable gas detector has a frame portion positioned at a portion, and the frame portion is positioned along the receiving support portion in the battery loading chamber . . A battery loading chamber cover is detachably provided at the rear end opening of the casing, and one battery connecting contact corresponding to each dry cell is disposed on the inner surface of the battery chamber cover. The portable gas detector according to any one of claims 1 to 3, wherein: The portable gas detector according to claim 4, wherein the contact piece for connecting a dry cell is made of a spring-like spring material . The portable type according to any one of claims 1 to 5, further comprising an alarm notification mechanism that issues an alarm when the concentration of the detected gas to be detected exceeds a certain reference value. Gas detector.

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