JPH07272151A - Device for fire alarm equipment - Google Patents

Abstract

PURPOSE:To provide a portable device a for fire alarm equipment, which can surely prevent the mutual deformation of upper/lower cases with a simple method. CONSTITUTION:The upper case 1 is alternately provided with tooth parts 1a projecting to the inner peripheral side of a connection surface and notched step parts 1b receiving tooth parts 2a protruding to the inner peripheral side of a connection surface in the lower case 2. The lower case 2 is alternately provided with the tooth parts 2a and notched step parts 2b receiving the tooth parts 1a of the upper case 1. When the upper case 1 is engaged with the lower case 2, the tooth parts 1a and 2a are alternately engaged and they are abutted on the step parts 1b and 2b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for fire alarm equipment, and more particularly to a device for fire alarm equipment capable of preventing warping of upper and lower cases as a casing of a fire detector or its tester. Is.

[0002]

2. Description of the Related Art In such a conventional device as described above, for example, as shown in FIG. 13, stepped portions 40a and 41a are provided on the joint surfaces of an upper case 40 and a lower case 41, respectively, which form a casing, or Many of them are rubbed together by providing a taper. As a structure for preventing the upper and lower cases from warping, for example, a small cylindrical protrusion is provided on one of the upper and lower cases, and the other of the upper and lower cases is opposed to this. An opening is provided in the opening, and the projection is fitted into the opening.

[0003]

However, with the above-described structure for preventing warpage, the engagement of the upper and lower cases is troublesome and the workability is poor, and a small member receives stress. There is a problem in that mutual deformation cannot be reliably prevented.

The present invention has been made in order to solve such problems, and an object thereof is to obtain a device for fire alarm equipment which can surely prevent mutual deformation of the upper and lower cases by a simple method.

[0005]

A fire alarm equipment according to the present invention is a fire alarm equipment for forming a casing by engagement of an upper case and a lower case, and the upper case has an inner circumference of a joint surface. The first case portion projecting to the side and the first step portion having a notch shape that receives the second tooth portion projecting to the inner peripheral side of the joint surface of the lower case are alternately arranged, and the lower case has the above-mentioned first step portion. 2 tooth portions and second notch-shaped step portions that receive the first tooth portion of the upper case are alternately provided, and when the upper case and the lower case are engaged, the first and second tooth portions are The gears are alternately meshed with each other so as to come into contact with the first and second step portions, respectively.

[0006]

According to the present invention, when the upper case is deformed outward or the lower case is deformed inward, the first tooth portion of the upper case is brought into contact with and fixed to the second step portion of the lower case, When the upper case is deformed inward or the lower case is deformed outward, the second tooth portion of the lower case abuts and is fixed to the first step portion of the upper case. By engaging the step portion or the second tooth portion and the first step portion of
The upper case and the lower case are prevented from warping each other.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of the drawings, taking as an example the case where one embodiment of the present invention is applied to an address confirmation device for setting and confirming the address of terminal equipment such as a fire detector. Here, the address confirmation device is a device that can read out and display data such as an address set in the EEPROM or the like in the fire detector from the outside and confirm the contents. FIG. 1 is an assembly diagram showing an embodiment of the present invention. In the figure, 1 is an upper case as a main body, 2 is a lower case fitted with the upper case 1, and 3 is a printed circuit board on which various electric parts and the like, not shown, are mounted. Reference numeral 4 is a base of a normal type fire detector, and 5 is a base of a small fire detector having a diameter smaller than that of the base 4, both of which are provided in respective recesses 6 of the upper case 1 as will be described later. Can be detachably attached. The attachment of the bases 4 and 5 will be described later.

Reference numeral 7 denotes a pair of terminals mounted on the printed circuit board 3 for electrically connecting the signal line of the so-called waterproof type fire detector by sandwiching the signal line of the fire detector.
Of course, the terminal 7 is electrically connected to the wiring on the printed circuit board 3, which is not shown. 8 is lower case 2
A plurality of bosses that are planted in the inside of each of the bosses, and the screws 9 are passed through the bosses 8 through the holes 10 of the printed circuit board 3 and screwed into a screw receiver (not shown) of the upper case 1. The upper case 1 and the lower case 2 are fitted together.

The upper case 1 and the lower case 2 are structured so that the case is positioned by alternately providing irregularities in a comb shape over the entire circumference of the fitting portion. FIG. 2 shows an example thereof, in which the upper case 1 has a tooth portion 1a protruding toward the inner peripheral side of the joint surface and a tooth portion 2a protruding toward the inner peripheral side of the joint surface of the lower case 2.
It has notch-shaped step portions 1b for receiving it alternately over the entire circumference. Similarly, the lower case 2 has the above-mentioned tooth portion 2a and the notch-shaped step portion 2b for receiving the tooth portion 1a of the above-mentioned upper case 1.
And have alternated all around.

Therefore, as shown in FIG. 3, when the upper case 1 is deformed outward or the lower case 2 is deformed inward, the tooth portion 1a of the upper case 1 contacts the step portion 2b of the lower case 2. Fixed, the upper case 1 is inward or the lower case 2
Is trying to deform outwards, the teeth 2 of the lower case 2
a is brought into contact with and fixed to the step portion 1b of the upper case 1, and the tooth portion 1
When a and the step portion 2b or the tooth portion 2a and the step portion 1b are engaged with each other, mutual deformation, that is, the upper case 1 and the lower case 2
The warp of is prevented. This is especially true in a small electric device when a small component is placed at a predetermined position, or when a large number of small switches and LEDs are used as a display operation unit and dimensional accuracy is required. Is useful. Further, a bending prevention support portion 2 _S (a support portion also exists on the back surface of the tooth portion 1a but is hidden) is formed inside the upper and lower tooth portions 1a, In particular, it is prevented from warping inward and protects the internal structure.

4 to 6 specifically show the address verifier of this embodiment. FIG. 4A is a plan view of the address verifier.
5B is a front view thereof, FIG. 5 is a side sectional view thereof, and FIG. 6 is a rear view thereof. 4 to 6, parts corresponding to those in FIGS. 1 and 2 are designated by the same reference numerals. In the figure, 11 is provided on the upper portion of the upper surface of the upper case 1, a base to which a normal type fire detector is detachably attached, 12 is a peripheral wall thereof, 13 is provided inside the base 11, and a small fire detector is A detachably attached base, 14 is a peripheral wall of the base, and 15 is provided in the base 1 and is a conductive blade for engaging with a blade metal fitting (not shown) when a conventional fire detector is mounted. The receiving metal fittings 16 are provided in the base 2 and are made of a conductive material for engaging and locking the blade fitting (not shown) with the blade receiving spring 17 when the small fire detector is mounted. It is a blade receiving metal fitting.

Reference numeral 18 is a signal line connected to the printed circuit board 3 (FIG. 1), 19 is a signal line between the bases 11 and 13, and 2 is a signal line.
Reference numeral 0 denotes a holding plate provided in the base 11 for holding the signal lines 18 and 19, and in the figure, S + represents a positive electrode side of the signal and S- represents a negative side of the signal. 21 is the base 1
Reference numeral 1 denotes a mounting screw for mounting a base to be described later on the upper case 1, and reference numeral 22 denotes a mounting screw for mounting a base to be described later on the base 13 to the upper case 1. 23 is an address display portion provided on the lower side of the upper surface of the upper case 1,
Reference numeral 24 is a membrane sheet provided on the address display portion 23, and 25 is a battery box provided in the lower case 2.

26 is a base of the base 11 on which the peripheral wall 12 is planted, 27 is a base of the base 13 on which the peripheral wall 14 is planted,
28 is, for example, LEDs as a plurality of display elements mounted on the printed circuit board 3, 29 is, for example, a push-button switch as a switch for address setting, execution or power supply, which is also mounted on the printed circuit board 3, and 30 is a battery box 25. It is a lid provided on the back side of.

FIG. 7 shows an example of a concrete structure of the holding structure for the printed circuit board 3. The upper case 1 is the printed circuit board 3.
Has a rib 1c formed with a stepped portion that abuts with, and a protruding portion 1d protruding from the stepped portion is formed above the rib 1c. Therefore, the protrusion 1 is formed on the printed circuit board 3.
An opening having the same shape as the cross section of d is bored. Further, the lower case 2 has a bottomed cylindrical portion 2c which abuts on the opposite surface of the printed circuit board 3 which abuts on the rib 1c of the upper case 1 and into which the protruding portion 1d of the rib 1c is inserted. A screw 9 is screwed into the protruding portion 1d of the rib 1c of the upper case 1 from the center to be fixed.

In FIG. 7, reference numerals A and B indicate the upper case 1 when the upper case 1 and the lower case 2 are fitted by screwing in the screws 9.
Represents the gap formed between the tooth portion and the step portion, and similarly, the symbol C represents the gap formed between the protruding portion 1d of the rib 1c of the upper case 1 and the bottom portion of the tubular portion 2c. These gaps are A, B, C
> 0, and for example, about 0.5 to 1.0 mm is preferable. In this case, since the part into which the screw 9 is screwed in and the part into which the case is fitted are substantially different from each other, the part into which the case is fitted is not scraped off, and is usually provided in the opening of the printed circuit board 3. Since the screw tap to be used is not damaged and the accuracy is not so high, the manufacturing becomes easy. Further, it is preferable that the gaps A and B are provided so that the contact surfaces around the upper case 1 and the lower case 2 are not distorted in shape.

In this way, the printed circuit board 3 is brought into contact with and fixed to the stepped portion of the rib 1c of the upper case 1,
The dimensional accuracy in the X, Y, and Z directions is improved, and the printed circuit board 3
Can be reliably positioned, and in particular, the portion indicated by the symbol N (the distance between the upper surface of the printed board 3 and the inner wall of the upper case 1) can be surely dimensioned, and the switch 29, the LED 28 and the like can be accurately arranged. . In particular, this printed circuit board holding structure is used for small electrical equipment when the error during molding has a large effect, and when small parts are not placed in the prescribed positions, or when the address confirmation device is used as described above, for example. This is useful when a large number of small switches, LEDs and the like are used as the operation unit and dimensional accuracy (for example, a portion indicated by reference numeral n in FIG. 11) is required.

FIGS. 8 and 9 show a base 11 for a conventional fire detector which is detachably attached to the concave portion 6 provided in the upper portion of the upper surface of the upper case 1 as described above.
And a state in which the normal type fire detector 31 and the small fire detector 32 are attached to and detached from the small fire detector base 13 provided inside the detector mounting bracket of the base 11. And 13 are simplified in their illustration. That is, FIG. 8A and FIG. 9A
Shows a state where the fire detector is taken out from the base, and FIGS. 8B and 9B show a state where the fire detector is attached to the base.

Then, as can be seen from the explanation of FIG.
Inside the two detector mounting brackets that are provided facing the circumference of the base 11 for the normal type fire detector,
The base 13 for the small fire detector is provided, and the sensor joint surface of the base 13 is substantially embedded in the detector mounting bracket of the base 11 for the conventional fire detector. Therefore, compared with the case where the normal type fire detector and the small fire detector are arranged side by side in the upper case part which is the main body, the space for the connection part of the fire detector is smaller and the size can be reduced. It is useful when you need a sensor connection part for setting and inspection, you carry it around for setting for on-site use, or when you need a smaller size because there is a display operation part etc. as an address checker. is there. Moreover, since the base for the small fire detector on the inside is slightly embedded, the base does not become a hindrance when connecting the conventional fire detector and is easy to handle.

FIG. 10 shows a connection state when the above-mentioned fire detector is a waterproof type. Normally, the waterproof fire detector does not have a metal fitting for taking out a signal, but uses a drawn signal line. There is. That is, in FIG. 10, 33 is a waterproof fire detector, 34 is an embedded resin provided at the bottom of the preventive fire detector 33, and 35 and 36 are signals drawn from the inside through the embedded resin 34. These are signal lines, and two of these signal lines are provided because of the feed wiring.

When setting the address of the protection type fire detector 33, the signal lines 35 and 36 are respectively sandwiched between the pair of terminals 7 and the terminals 7 are held.
So that it is electrically connected to the metal fitting on the base side. Therefore, in this case, the terminal 7 can be a terminal that does not need to be attached to the base of the fire detector. It is useful.

FIG. 11 is a partially enlarged view of a portion of the push button type switch 29 provided on the printed circuit board 3. In the figure, the upper case 1 has an opening 1e adjacent to the printed circuit board 3 and a peripheral wall 1f around the opening 1e for contacting the printed circuit board 3. The peripheral board 1f positions the printed circuit board 3 and the upper case 1 which are close to each other. The switch 29 is arranged on the printed circuit board 3 in the opening 1e, and the portion of the opening 1e is covered with the membrane sheet 24. Further, the lower case 2 is provided with a protruding portion 2d which comes into contact with at least the back surface of the printed circuit board 3 provided with the switch 29, whereby the printed circuit board when the switch 29 is pressed through the membrane sheet 24. The deformation of 3 is prevented.

As described above, the switch 29 on the printed circuit board 3 is directly pressed through the membrane sheet 24. Since a push rod or the like is not interposed between the switch 29 and the membrane sheet 24 like a normal switch, The number of parts is reduced, the manufacturing process is reduced, and the cost is reduced. In addition, the peripheral wall 1f of the opening 1c of the upper case 1
With this, the positioning with respect to the printed circuit board 3 is performed, and the protrusion 2d from the lower case 2 abuts on the back surface of the printed circuit board 3, so that the deformation of the printed circuit board 3 to the opposite side is also prevented. Further, since there are no tall parts near the switch 29 and the positioning accuracy of the printed circuit board 3 is improved as described above, the switch 29 can be directly pressed.

Furthermore, the space between the upper case 1 and the printed circuit board 3 is close to only the operation part where the switch 29 and the like are present,
Since the other portions have a sufficient space, the parts can be easily arranged. This structure for directly pressing the switch has a display operation especially when a small device has a large influence on the molding error and a small component is not arranged at a predetermined position, or when the address setting device is used as described above. This is useful when a large number of small switches, LEDs, etc. are used as the section and dimensional accuracy is ensured.

FIG. 12 is an enlarged view of the battery box 25, and FIG. 12 (a) is a cross sectional view thereof.
(B) is the back view. In the figure, 37 is a socket housed in the battery box 25, and 38 is a socket 3.
Battery set to 7, 39 is also the battery box 25
A fuse provided on the pedestal 42 so as to be disposed inside. In addition, it usually takes about 24 hours to operate the fire detector.
A voltage of V is required, so here, for example, 1.5
A case where the device is portable is shown by providing a booster circuit (not shown) that boosts the voltage of 6V to 30V by using four V batteries.

As described above, since the components other than the battery, such as the fuse 39, which are to be replaced as needed, are arranged in the battery box 25, the components of the battery 38 and the fuse 39 can be opened by opening the lid 30 of the battery box 25. The replacement can be easily performed, the workability is better than that of providing them individually, and the structure is simple. Further, as can be seen from FIG. 12, since the battery box 25 containing the battery 38 is arranged in the vicinity of the operation unit such as the switch 29, that is, near the equipment, the center of gravity of the equipment is substantially at hand, and It has the advantage of being cheap and easy to operate when holding the device in your hand. Further, as shown in FIG. 4, the belt stopper 41
In addition, a belt (not shown) can be connected and can be carried by hanging it on the shoulder. Naturally, the belt stopper 41 has the entire center of gravity removed.

The method of using the address checker will be briefly described. When the address checker is installed at the place where the fire detector whose address is desired to be checked is held in hand or on the shoulder. Remove the existing fire detector from the installation surface. For example, as shown in Fig. 8, fire detector 3
1 is engaged with the base 11. Then, the power source portion displayed on the membrane sheet 24 of the address checker is pressed to turn on the power source switch 29. Then, the address verifier reads the address from the connected fire detector 31 by signal transmission, and the LED 2 at the position corresponding to the address number on the membrane sheet 24.
8 is turned on and the address is displayed.

Check the address number displayed on the membrane sheet 24, turn off the power, and if the address is determined to be correct, remove the fire detector 31 from the address checker and replace it with the original installation surface. To install. If the address is judged to be incorrect,
The desired address is set again in the fire detector 31, the address is read again by the same operation and displayed on the membrane sheet 24. If the address is correct, the fire detector 31 is set to the address confirmation device. Remove it and install it on the original installation surface. In this way, the address set inside the fire detector can be made proper.

[0028]

As described above, according to the present invention, there is provided a fire alarm equipment for forming a casing by the engagement of the upper case and the lower case, the upper case protruding toward the inner peripheral side of the joint surface. 1 tooth portion and a notch-shaped first step portion that receives the second tooth portion that protrudes toward the inner peripheral side of the joint surface of the lower case are alternately provided,
The lower case has alternately the second tooth portion and the notch-shaped second step portion that receives the first tooth portion of the upper case. When the upper case and the lower case are engaged, the first case and the second case are formed. Since the two tooth portions are alternately meshed with each other and abut against the first and second step portions, respectively, it is possible to surely prevent the upper case and the lower case from warping each other by a simple method. You can
This is especially useful in small equipment, etc., where many small parts are used and placed at predetermined positions, and dimensional accuracy is required. Furthermore, internal warping is prevented by preventing warpage inward. There is an effect that it can be protected.

[Brief description of drawings]

FIG. 1 is an assembly diagram showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of an embodiment of the present invention.

FIG. 3 is a diagram for explaining an essential part of an embodiment of the present invention.

FIG. 4 is a plan view and a front view showing an embodiment of the present invention.

FIG. 5 is a cross sectional view showing an embodiment of the present invention.

FIG. 6 is a back view showing an embodiment of the present invention.

FIG. 7 is a diagram for explaining an essential part of an embodiment of the present invention.

FIG. 8 is a perspective view showing a detached state of the conventional fire detector with respect to the base in the embodiment of the present invention.

FIG. 9 is a perspective view showing a detached state of the small fire detector with respect to the base according to the embodiment of the present invention.

FIG. 10 is a perspective view showing a connection state of the protection type normal type fire detector to the terminal in the embodiment of the present invention.

FIG. 11 is a sectional view showing a switch mounting structure according to an embodiment of the present invention.

12A and 12B are a cross-sectional view and a rear view for explaining a battery box according to an embodiment of the present invention.

FIG. 13 is a view showing a conventional fire alarm equipment.

[Explanation of symbols]

 1 Upper Case 1a, 2a Teeth 1b, 2b Step 1c Rib 1d, 2d Projection 1e Opening 1f Peripheral Wall 2 Lower Case 2c Bottomed Cylindrical 3 Printed Circuit Board 7 Terminal 9 Screw 11 Normal Type Fire Detector Base 13 Small Fire detector base 15 Standard type fire detector blade receiving bracket 16 Small fire detector blade receiving bracket 17 Small fire detector blade receiving spring 23 Address display 24 Membrane sheet 25 Battery box 28 LED 29 Switch 30 Lid 31 Normal type fire detecting Device 32 Small fire detector 33 Preventive fire detector 38 Battery 39 Fuse

Claims (1)

[Claims] 1. A fire alarm equipment for forming a casing by engaging an upper case and a lower case, wherein the upper case has a first tooth portion projecting to an inner peripheral side of a joint surface,
The lower case is alternately provided with a notch-shaped first step portion that receives the second tooth portion that protrudes toward the inner peripheral side of the joint surface of the lower case, and the lower case is the second tooth portion and the upper case. Alternately having a notch-shaped second step portion for receiving the first tooth portion, and when the upper case and the lower case are engaged with each other, the first and second tooth portions are alternately meshed with each other. A device for a fire alarm facility, characterized in that the device is in contact with the first and second steps, respectively.