JP2008234307A - Fire alarm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire alarm which can be made compact, and which is excellent in the attachment/detachment workability of a pull cord. <P>SOLUTION: This fire alarm is provided with: a circuit board which is housed in a casing 10 and on which a fire detection part is mounted; a switch cap which is shaped like an almost L character and equipped with a push button part 6a at one end and a pull cord restraint part 6b at the other end; and a pull cord 7 which is detachably restrained with the pull cord restraint part 6b and operates the switch cap 6. The fire alarm is also provided with a recess 3 formed on a back face 1c in the neighborhood of the peripheral part of a main body 1; a through-hole 1a formed on the bottom face of the recess 3 into which the pull cord restraint part 6b of the switch cap is inserted; and a pull cord fixing groove 6c formed at the pull cord restraint part 6b of the switch cap. The pull cord restraint part 6b is formed so as not to be projected from the back face 1c of the main body 1, and a pull cord fixing groove 6c is formed with a predetermined interval from the bottom face of the recess 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fire alarm that can be made compact and has good workability for attaching and detaching a drawstring.

A conventional detector includes a mounting base, a main body that houses a switch that switches the operation of the detection means and the detection means, a hook that drives the switch, a convex portion that protrudes from the outer surface of the main body, and a convex portion at one end knot. And a pulling string that engages with the recess by engaging the central portion with a part of the hook and activates the hook by a pulling operation from the other end side (see, for example, Patent Document 1).
JP 2006-244408 A (paragraphs 0011 to 0022, FIGS. 1 to 6)

  The conventional detector has a problem that an extra space is required such as providing a relief on the engaging base to be engaged because the convex portion for fixing the knot of the drawstring protrudes from the bottom surface.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fire alarm device that can be made compact and that has good workability for attaching and detaching a drawstring.

  A fire alarm device according to the present invention has a housing composed of a main body and a cover, a circuit board housed in the housing, mounted with a fire detection unit and a switch, and has a substantially L shape, with one end on the cover. A push button portion having a movable shaft to be supported, and a pull string locking portion at the other end; a switch cap for operating the switch; and a switch cap detachably locked to the pull string locking portion; And a pull string for operating the switch by pulling inwardly into the housing, and a recess provided on a back surface in the vicinity of the peripheral edge of the main body, and a bottom surface of the recess. , A through hole into which the pull string locking portion of the switch cap is inserted, and a pull string fixing groove provided in the pull string locking portion of the switch cap, wherein the pull string locking portion is Does not protrude from the back of the main body, and In which the drawstrings fixing groove was set to be a predetermined distance from the bottom surface of the recess.

Further, a drawstring guide groove that is continuous with the through hole and has the same width as the outer shape of the knot of the drawstring is provided on the bottom surface of the recess provided with the through hole.
Furthermore, a step portion for guiding the drawstring is provided outside one side of the drawstring locking portion.

  According to the present invention, a casing composed of a main body and a cover, a circuit board accommodated in the casing and mounted with a fire detection unit and a switch, and having a substantially L shape, are supported by the cover at one end. A push button part having a movable shaft and a pull string locking part at the other end, a switch cap for operating the switch, and a detachably locked to the pull string locking part, In a fire alarm provided with a pull string that pulls inward of the housing to operate the switch, a recess provided on the back surface in the vicinity of the peripheral edge of the main body, provided on the bottom surface of the recess, A through hole into which a pull string locking portion of the switch cap is inserted, and a pull string fixing groove provided in the pull string locking portion of the switch cap, wherein the pull string locking portion of the main body Does not protrude from the back surface, and Because can string fixing groove was set to be a predetermined distance from the bottom surface of the recess it can be made compact, and can improve the attachment and detachment of the pull string.

In addition, since the drawstring guide groove that is continuous with the through hole and has the same width as the outline of the drawstring knot is provided on the bottom surface of the recess provided with the through hole, the drawstring attachment / detachment workability is improved. Can do.
Furthermore, since the step part which guides the said drawstring was provided in the outer side of the said drawstring latching | locking part, a drawstring can be guide | induced to a cover groove | channel easily.

Embodiment 1 FIG.
1 is a perspective view of a fire alarm showing Embodiment 1 of the present invention, FIG. 1 (a) is a perspective view when a mounting base (not shown) is removed, and FIG. 1 (b) is a drawstring. It is the elements on larger scale of a latching | locking part.
FIG. 2 is a partial cross-sectional view taken along line BB in FIG. 1, and FIG.

  1 to 3, the fire alarm device includes a housing 10 composed of a main body 1 and a cover 5, a fire detection unit (not shown), and a tact switch 9 for stopping an alarm sound. And the like, a circuit board 4 on which a motor is mounted, an alarm buzzer (not shown), a substantially L-shape, a movable shaft 6d and a tact switch 9 supported by a receiving groove 5b provided in the cover 5 at one end. The push button portion 6a having the convex portion 6e to be operated, the switch cap 6 having the pull string locking portion 6b at the other end, and the end portion of the peripheral wall of the cover 5 detachably locked to the pull string locking portion 6b Is pulled out from the cover groove 5a provided in the housing 10 and pulled to the inside of the housing 10 to pull the switch cap 6 to operate the tact switch 9, and is locked to the back surface 1c of the main body 1, and is attached to the ceiling surface or the like. A mounting plate (not shown) having a mounting screw hole To have.

The main body 1 has a substantially bottomed cylindrical shape, and has a concave battery housing portion 2 formed on the back surface 1 c and a bottom surface of the concave portion 3 provided on the back surface 1 c in the vicinity of the peripheral wall of the main body 1 and connected to the battery housing portion 2. A through hole 1a is provided in 3a and into which the drawstring locking portion 6b of the switch cap 6 is inserted. A fixed piece 8 for holding the battery is also provided.
The cover 5 is provided with a fire detection part (not shown) at the center of the bottom, and a hole 5c for the push button part 6a of the switch cap 6 is provided on the front surface of the cover 5.

The switch cap 6 includes a push button portion 6a, an indicator lamp cover portion 6f, a movable shaft 6d, and a drawstring locking portion 6b, and the drawstring locking portion 6b has a drawstring fixing groove 6c. Is provided. Moreover, in the drawstring latching | locking part 6b, the front-end | tip part side of the drawstring latching part 6b of the drawstring fixing groove 6c is extended, and the hooking piece 6h is provided. Further, a step portion 6g that guides the drawstring 7 with substantially the same width of the drawstring fixing groove 6c is provided outside one side of the drawstring locking portion 6b side.
The drawstring fixing groove 6c is provided in a substantially orthogonal direction with respect to the step portion 6g so that the drawstring 7 can be easily guided, and further, the drawstring fixing groove 6c is not easily detached when the drawstring 7 is operated.
After the assembly, the drawstring locking portion 6b does not protrude from the back surface 1c of the main body 1, and the drawstring fixing groove 6c is spaced from the bottom surface 3a of the recess 3 so that the drawstring 7 uses a tool or the like. The interval is detachable.
The drawstring 7 is provided with a drawstring knot 7a at one end and a knob portion 7b at the other end, and the drawstring knot 7a can be attached to and detached from the drawstring fixing groove 6c of the drawstring locking portion 6b of the switch cap 6. .

  Next, assembly of the fire alarm device of this embodiment will be described. First, as shown in FIG. 2, the movable shaft 6d of the switch cap 6 is inserted into the receiving groove portion 5b of the cover 5, and the push button portion 6a is inserted into the hole 5c for the push button portion 6a. Next, the circuit board 4 and the alarm buzzer are each set at the attachment location of the cover 5. At this time, the position of the tact switch 9 mounted on the circuit board 4 and the convex portion 6e of the push button portion 6a are aligned. Next, as shown in FIG. 1, the main body 1 is inserted into the cover 5 so as to pass the pull string locking portion 6 b of the switch cap 6 through the through hole 1 a of the main body 1.

  At this time, as shown in FIG. 2, the back surface of the cover 5 and the back surface of the main body 1 are the same surface, and the end of the drawstring locking portion 6 b does not protrude from the back surface 1 c of the main body 1. The step L1 from 1c to the bottom is a step that allows the pull string locking portion 6b to move upward, and the pull string fixing groove 6c of the pull string locking portion 6b is a distance from the cover groove 5a of the cover 5 to the bottom. L2 is a sufficient distance for the pulling string 7 locked to the pulling string fixing groove 6c to be pulled upward, and the distance L3 between the pulling string fixing groove 6c and the bottom surface 3a of the recess 3 is determined by the pulling string 7 The intervals are detachable. Next, screws (not shown) are screwed into the mounting holes 11 of the main body 1 to fix the main body 1, the circuit board 4 and the alarm buzzer (not shown) to the cover 5 at the same time.

  Next, as shown in FIG. 1B, the drawstring 7 is fitted into the drawstring fixing groove 6c substantially orthogonal to the step 6g of the drawstring locking portion 6b of the switch cap 6, and provided at one end of the drawstring. The knot 7a is engaged so as to stop inside the drawstring locking portion 6b. Then, the knob portion 7 b of the drawstring 7 is pulled out from the cover groove 5 a of the cover 5. Then, a battery (not shown) is attached to the battery housing 2 and fixed with the fixing piece 8. Next, an attachment plate (not shown) is attached to the main body 1.

  In the fire alarm assembled in this way, when a fire detection unit (not shown) detects a fire, the switch cap 6 functions as an illuminated switch by sounding an alarm buzzer or turning on an indicator light (not shown). Inform the fire. At this time, when the knob portion 7b of the pull string 7 is pulled, the pull string 7 is pulled in the direction of the cover groove 5a, the pull string locking portion 6b of the switch cap 6 moves upward, and the convex portion of the switch cap 6 6e presses the tact switch 9 mounted on the circuit board 4, and the alarm buzzer stops sounding. Further, when the fire detection unit stops detecting the fire, the indicator light is turned off.

  Next, the pull string 7 is removed by first removing the main body 1 from the mounting plate and pulling after the knot 7a of the pull string 7 is pushed out along the pull string fixing groove 6c of the pull string locking portion 6b of the switch cap 6. Remove the string 7. Next, the mounting plate is attached to the main body.

  As described above, the housing 10 composed of the main body 1 and the cover 5, the circuit board 4 housed in the housing 10 and mounted with the fire detection unit and the tact switch 9, has a substantially L shape, and has one end A push button 6a having a movable shaft 6d supported by the cover 5 at the part, a pulling string locking part 6b at the other end, a switch cap 6 for operating the tact switch 9, and a pulling string locking part 6b. In a fire alarm provided with a pull string 7 that is detachably locked and pulls the switch cap 6 inward of the housing 10 to operate the tact switch 9, it is provided on the back surface 1c near the peripheral edge of the main body 1. The recessed portion 3, the through hole 1a provided in the bottom surface 3a of the recessed portion 3 into which the pulling string locking portion 6b of the switch cap 6 is inserted, and the pulling provided in the pulling string locking portion 6b of the switch cap 6. A string fixing groove 6c; Since the portion 6b does not protrude from the back surface 1c of the main body 1 and the drawstring fixing groove 6c is located at a predetermined distance from the bottom surface 3a of the recess 3, it can be made compact, and the drawstring 7 can be attached and detached. Workability can be improved.

  Further, in the pull string locking portion 6b, the leading end side of the pull string fixing portion 6b of the pull string fixing groove 6c is made longer than the push button portion 6a side, and a step 6g is provided. When it is fitted into the string fixing groove 6c, the pull string 7 can be easily put into the string fixing groove 6c. Further, when the step 6g is installed and the hooking piece 6h has a sufficient width to join the pulling string locking portion 6b, the strength of the pulling string locking portion 6b is improved and the pulling string 7 is pulled. In addition, it can be made difficult to come off.

In the present embodiment, the bottom surface 3a of the recess 3 is continuous with the bottom surface 2a of the battery storage unit 2, but it is not always necessary.
In this embodiment, a battery is used as a power source. However, a commercial power source may be used. In this case, the main body 1 may not have the battery storage portion 2, but at least the recess 3 is provided. .

Embodiment 2. FIG.
4 is a perspective view of a fire alarm showing Embodiment 2 of the present invention. FIG. 4 (a) is a perspective view when a mounting base (not shown) is removed, and FIG. 4 (b) is a drawstring. It is the elements on larger scale of a latching | locking part.
In the figure, the same parts as those in FIG.
On the bottom surface 3a of the recess 3 in which the through hole 1a of the main body 1 is provided, a draw string guide groove 12 that is continuous with the through hole 1a with the same width as the outer shape of the knot 7a of the draw string 7 is provided.

  In this configuration, in order to attach the drawstring 7 to the drawstring fixing groove 6c of the drawstring locking portion 6b of the switch cap 6, the knot 7a of the drawstring 7 is inserted into the drawstring guide groove 12, and the drawstring 7 is pulled. The knob portion 7b of the pull string 7 is pulled out from the cover groove 5a of the cover 5 so as to be hooked on the hook piece 6h of the pull string engaging portion 6b in the vicinity of the entrance of the guide groove 12. When the knot 7a of the drawstring 7 is kept in the drawstring guide groove 12, when the knob 7b of the drawstring 7 is pulled, the drawstring 7 is fitted into the drawstring fixing groove 6c. The knot 7a comes out of the drawstring guide groove 12 and stops and is fixed inside the drawstring locking portion 6b.

As described above, the pull string 7 is provided on the bottom surface 3a of the recess 3 provided with the through hole 1a so as to extend to the through hole 1a with the same width as the outer shape of the knot 7a of the pull string 7. By simply setting the knot 7a in the drawstring guide groove 12 and pulling the drawstring 7, the drawstring 7 can be easily fastened to the drawstring fixing groove 6c.
In addition, since the pull string 7 can be easily retained in the pull string fixing groove 6c as described above, the distance L3 between the pull string fixing groove 6c and the bottom surface 3a of the recess 3 can be reduced, and further downsizing can be achieved. be able to.

It is a perspective view of the fire alarm which shows Embodiment 1 of this invention. 2 is a partial cross-sectional view taken along line BB in FIG. 1 is a structural diagram of a switch cap of a fire alarm device showing Embodiment 1. FIG. It is a perspective view of the fire alarm which shows Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Main body, 1a Through-hole, 1c Back surface, 3 Concave, 3a Bottom surface, 4 Circuit board, 5 Cover, 5a Cover groove, 6 Switch cap, 6a Push button part, 6b Pull string locking part, 6c Pull string fixing groove, 6d Movable shaft, 7 drawstring, 7a knot, 9 tact switch, 10 housing, 12 drawstring guide groove.

Claims (3)

A casing composed of a main body and a cover, a circuit board accommodated in the casing and mounted with a fire detection section and a switch, a push having a substantially L shape and a movable shaft supported by the cover at one end. The button part and the other end part have a pull string locking part, and are detachably locked to the switch cap for operating the switch, and the pull string lock part, and the switch cap is placed inside the casing. In a fire alarm comprising a pull string that pulls to actuate the switch,
A recess provided on the back surface in the vicinity of the peripheral edge of the main body;
A through-hole provided on the bottom surface of the recess, into which the drawstring locking portion of the switch cap is inserted;
A pull string fixing groove provided in the pull string locking portion of the switch cap;
With
The fire alarm is characterized in that the drawstring locking portion does not protrude from the back surface of the main body, and the drawstring fixing groove is spaced from the bottom surface of the recess.   The fire alarm device according to claim 1, wherein a pulling string guide groove connected to the through hole is provided at a bottom surface of the concave portion provided with the through hole and having substantially the same width as an outline of the knot of the pull string.   The fire alarm according to claim 1, wherein a step portion for guiding the drawstring is provided outside one side of the drawstring locking portion.

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