JP2009104349A - Fire alarm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire alarm reduced in manufacturing man-hours, and equipped with a mounting structure of a press button with little rattling. <P>SOLUTION: This fire alarm is provided with: a tact switch 5 formed on a circuit board 7 housed in a casing configured of a main body 1 and a protection cover 2; a press button part 11 equipped with a shaft part 8 rotatably supported by a bearing groove 12 formed in the protection cover 2, and configured to operate the tack switch 5; and a pressing member 13 for pressing a shaft part 8 of the pressing button part 11 from the side opposite to the opening of the bearing groove 12. A rectangular plate part 8a is formed at the opening side of the bearing groove 12 while being mounted on the bearing groove 12 in the shaft part 8, and a pressing face part 13a configuring a rectangular plane is formed to face the plane part 8a formed in the shaft part 8 in the pressing member 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fire alarm having a push button mounting structure with less manufacturing man-hours and less rattling.

  A conventional fire alarm is provided with a push button for pressing a tact switch on a printed circuit board on a cover of a housing, and the push button is a heat welding portion provided on the back side of the cover in a hole provided in the push button. , And the heat-welded portion is heat-welded and fixed to the cover (see, for example, Patent Document 1).

  Moreover, the push button of the conventional fire alarm is fixed to the printed circuit board with a screw (for example, refer patent document 2).

JP 2006-59278 A (paragraph 0028, FIG. 14) Japanese Patent Laid-Open No. 7-334766 (paragraph 0017, FIG. 2)

  The conventional push button mounting structure of a fire alarm device is attached to the back side of the cover of the housing in Patent Document 1 by thermal fusion, and in Patent Document 2 is attached to a printed circuit board with screws, both of which have a manufacturing man-hour. There were many problems.

  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 having a push button mounting structure with less manufacturing steps and less rattling.

  The fire alarm device of the present invention has a switch provided on a circuit board housed in a casing made of a main body and a protective cover, and a shaft portion rotatably supported by a bearing groove provided in the protective cover. In the fire alarm device having a push button for operating the switch, a pressing member for pressing the shaft portion of the push button from the side facing the opening of the bearing groove is provided.

  The shaft portion of the push button is formed with a rectangular flat portion on the opening side of the bearing groove in a state of being mounted in the bearing groove, and the pressing member is provided on the shaft portion of the push button. A pressing surface portion forming a rectangular flat surface is provided so as to face the flat portion.

  Further, the flat portion of the shaft portion of the push button and the pressing surface portion of the pressing member are rectangular, and the long side of the pressing surface portion of the pressing member is shorter than the long side of the flat portion of the shaft portion, The surface portion is provided so as to face the substantially central portion of the flat portion of the shaft portion.

  Further, the flat portion of the shaft portion of the push button and the pressing surface portion of the pressing member are rectangular, and when the push button is pressed, the shaft portion extends from a center line orthogonal to the flat portion of the shaft portion. The distance from one long side of the pressing surface portion positioned in the rotating direction to L1, the distance from the center line to the other long side of the pressing surface portion to L2, the short side of the rectangular flat portion of the shaft portion When the distance is L3, L1 <L2 and L1 + L2 <L3.

  In addition, the shaft portion has a semi-cylindrical cross section, and a linear portion facing the arc portion forms an outline of the flat portion of the shaft portion.

  According to the present invention, since the pressing member for pressing the shaft portion of the push button from the side facing the opening of the bearing groove is provided, the push button is attached only by pressing the shaft portion with the bearing groove and the pressing member. It is possible to reduce the number of manufacturing steps, and by pressing down, it is possible to reduce backlash even in a normal state.

  In addition, the shaft portion of the push button is formed with a rectangular flat portion on the opening side of the bearing groove in a state of being mounted in the bearing groove, and the pressing member is formed on the flat portion provided on the shaft portion of the push button. Since the holding surface part that forms a square plane opposite to each other is provided oppositely, the conventional shaft part is usually manufactured in a circular shape, so in a normal state, it is rattled by vibrations and lacks stability, By forming the back side of the shaft part into a square (planar part), and similarly forming the pressing surface part of the pressing member into a rectangular flat surface and pressing it in, these contact areas become larger and the backlash is eliminated. And the stability of the push button is improved. In addition, since the reaction force when the push button is pressed increases, the reaction force can easily return to the normal state.

  Further, the flat portion of the shaft portion of the push button and the pressing surface portion of the pressing member are rectangular, the long side of the pressing surface portion of the pressing member is shorter than the long side of the flat portion of the shaft portion, and the pressing surface portion is the flat surface of the shaft portion. It was made to be provided almost opposite to the center of the part. That is, the pressing surface of the pressing member is not applied to the entire square flat portion of the shaft portion, but is applied to the central portion of the rectangular flat surface portion of the shaft portion, so that the pressing surface portion of the pressing member is applied to the entire flat surface portion. The operational feeling of the push button is not increased more than necessary, and the operational feeling at the time of pressing from any direction can be made uniform because it is applied to the central portion of the rectangular flat portion of the shaft portion.

  In addition, the flat portion of the shaft portion of the push button and the holding surface portion of the pressing member are rectangular, and when the push button is pressed, the press portion is positioned in the direction in which the shaft portion rotates from the center line orthogonal to the flat portion of the shaft portion. L1 <L2 where L1 is the distance to one long side of the surface portion, L2 is the distance from the center line to the other long side of the holding surface portion, and L3 is the distance of the short side of the rectangular flat portion of the shaft portion. , L1 + L2 <L3. That is, by setting L1 + L2 <L3, the operation feeling of the push button is not increased more than necessary as when the pressing surface portion of the pressing member is applied to the entire flat surface portion, and by setting L1 <L2. For example, even if an assembling error occurs, the L2 portion exists reliably, and a reaction force can be reliably generated when the push button is pressed.

  Further, since the shaft portion has a semi-cylindrical cross section and the straight line portion facing the arc portion forms the outline of the flat portion of the shaft portion, the distance between the short sides of the flat portion of the shaft portion can be increased, and L1 and L2 Easy to adjust the dimensions.

   FIG. 1 is a configuration diagram of a fire alarm showing an embodiment of the present invention. FIG. 1 (a) is a front view, FIG. 1 (b) is a side view, and FIG. 1 (c) is FIG. 1A is a cross-sectional view taken along line BB of FIG. 1A, FIG. 2 is an exploded perspective view of a fire alarm, and FIG. 2A is viewed from the main body side. FIG. 2B is an exploded perspective view as seen from the protective cover side, FIG. 3 is an enlarged view of the main part of FIG. 2A, and FIG. 4 is an enlarged view of the main part of FIG. 2B is an enlarged view of a main part when part of FIG. 2B is assembled, FIG. 5 is an enlarged cross-sectional view of the main part of FIG. 1, and FIG. 5A is a side view of the bearing groove part of FIG. Fig. 5 (b) is an enlarged view of the main part of Fig. 1 (d).

  1 to 5, the fire alarm device includes a housing 3 including a main body 1 and a cover 2 (protective cover), and a smoke detection unit and an alarm sound that are housed in the housing 3 and are examples of the fire detection unit 4. A circuit board 7 on which a tact switch 5 for stopping, a fire lamp 6 and the like are mounted, an alarm speaker 9 connected to the circuit board 7 and wiring (not shown), and a substantially L-shaped body 11a (FIG. 3) And a tactile switch on the back side of the trunk portion 11a in the vicinity of the shaft portion 8 and a drawstring locking portion 20 in which a drawstring (not shown) is locked on the other side. An illuminated push button 11 having a convex portion 10 for actuating 5, a pair of U-shaped bearing groove portions 12 provided on the back side of the cover 2 and rotatably supporting the shaft portion 8 of the push button 11, The shaft portion 8 of the push button 11 is provided on the front surface side of the main body 1 from the side facing the opening of the bearing groove portion 12. A pressing member 13 held down in surface contact, locked to the rear surface of the main body 1, and a mounting plate 30 having a mounting screw hole or the like to a ceiling surface or the like.

The shaft portion 8 of the push button 11 has a semi-cylindrical cross-sectional shape and has a rod shape, and is provided to extend from the body portion 11a in the left-right direction. The flat surface portion 8a provided on the back surface side is rectangular, and the end surface 12a of the opening portion of the bearing groove portion 12 is a shaft portion in a state where both ends of the arc surface portion 8b provided on the front surface side are attached to the pair of bearing groove portions 12. 8 is made higher than the rectangular flat surface portion 8a so as to stabilize the rotation of the shaft portion 8 (see FIG. 6C). Further, a sufficient gap is provided between the bearing groove portion 12 and the shaft portion 8, and when the shaft portion 8 is rotated by the operation of the push button 11, the long side (edge) of the rectangular flat portion 8 a of the shaft portion 8 is the inner surface of the bearing groove portion 12. (See FIGS. 3 and 6C).
Further, the rectangular flat portion 8a of the shaft portion 8 is formed at the position of the tangent line of the circle forming the arcuate surface portion 8b of the shaft portion 8 so that it can be rotated as easily as a conventional arc-shaped shaft portion.

The pressing member 13 is provided with a pressing surface portion 13a having a rectangular plane opposite to the rectangular flat portion 8a provided on the shaft portion 8 of the push button 11, and reinforcing columns 13b having an H-shaped cross section are provided on both sides of the pressing surface portion. 13a is provided integrally. Further, the end surface (front side) of the pressing surface portion 13a is a rectangular flat surface, and its long side 13c is shorter than the long side of the flat surface portion 8a of the shaft portion 8, and is disposed to face the inside of the pair of bearing groove portions 12. In addition, the flat portion 8a of the shaft portion 8 is in contact with the center of each long side of the pressing surface portion 13a so as to substantially coincide (see FIG. 5B). Moreover, the end surfaces 12a and 12a of a pair of bearing groove part 12 are provided facing the end surface of a pair of reinforcement pillar 13b.
Here, the height of the pressing surface portion 13 a is a height set higher than the reinforcing column 13 b so that the reinforcing column 13 b does not come into surface contact with the end surfaces 12 a of the pair of bearing groove portions 12.

  Thus, since the pressing member 13 that presses down the shaft portion 8 of the push button 11 is provided, the push button 11 can be attached only by pressing the shaft portion 8 with the bearing groove portion 12 and the pressing member 13, and the number of manufacturing steps can be increased. In addition, the backlash can be reduced even in a normal state by pressing.

  Further, the shaft portion 8 of the push button 11 is formed with a square flat surface portion 8a, and the pressing member 13 is provided with a pressing surface portion 13a having a rectangular flat surface, so that the conventional shaft portion is Since it is usually manufactured in a circular shape, it is unstable due to vibration or the like in a normal state and lacks stability, but the back side of the shaft portion 8 is formed in a square shape (planar portion 8a), and the pressing member 13 is similarly formed. By forming the pressing surface portion 13a into a rectangular flat surface and pressing it in, these contact areas are increased, the backlash can be eliminated, and the stability of the push button 11 is improved. In addition, since the reaction force when the push button 11 is pressed increases, the reaction force can easily return to the normal state.

  Further, since the pressing surface portion 13a of the pressing member 13 is not applied to the entire rectangular flat surface portion 8a of the shaft portion 8, but is applied to the central portion of the rectangular flat surface portion 8a of the shaft portion 8, the pressing member 13 is applied to the entire flat surface portion 8a. The operation feeling of the push button 11 does not become unnecessarily large as when the pressing surface portion 13a is applied, and the pressing surface portion 13a is applied to the central portion of the rectangular flat surface portion 8a. The operation feeling can be made uniform.

The main body 1 has a substantially bottomed cylindrical shape, and includes a concave portion 14 through which the pulling string locking portion 20 of the push button 11 is inserted on the peripheral wall side in the vicinity of the pressing member 13, a concave battery storage portion 15 formed on the back surface, and the like. Is provided. Further, a contact portion 23 for fixing the circuit board 7 and a screw mounting portion 19 for fixing the cover 2 are provided upright on the front side. Similarly, on the cover 2, a mounting portion 21 for fixing the circuit board 7 and a screw mounting portion 22 for fixing the main body 1 are erected on the back side.
A rectangular hole 16 into which the push button 11 is inserted is provided along the peripheral wall from the front surface of the cover 2, and a guide plate 17 that guides the movement of the push button 11 along the long side of the hole 16 is provided on the rear side. Is erected.
The circuit board 7 is provided with a hole 18 through which the pressing member 13 is passed when the circuit board 7 is attached to the main body 1.

Next, assembly of the fire alarm device of the present embodiment will be described with reference to FIGS. First, as shown in FIG. 3, the shaft portion 8 of the push button 11 is inserted into the bearing groove portion 12 of the cover 2, and the body portion 11 a of the push button 11 is inserted through the guide plate 17 into the hole 16 for the push button 11. Next, the circuit board 7 and the alarm speaker 9 are each set at the attachment location of the cover 2. The circuit board 7 is placed on a placement portion 21 erected on the back side of the cover 2 or a part of the screw attachment portion 22.
At this time, as shown in FIG. 5, the contact of the tact switch 5 mounted on the circuit board 7 and the position of the convex portion 10 of the push button 11 are aligned.
Next, as shown in FIGS. 2 and 4, the main body 1 is inserted into the cover 2 so that the pressing member 13 of the main body 1 is passed through the hole 18 of the circuit board 7. Then, the abutting portion 23 standing on the front side of the main body 1 and a part of the screw mounting portion 19 abut on the back side of the circuit board 7, and the circuit board 7 is sandwiched between the cover 2 and the main body 1. Is done. Then, screws (not shown) are threaded from the back side of the main body 1 through the holes of the screw mounting portion 19 to screw the main body 1 and the screw mounting portions 19 and 22 of the cover 2. At this time, the circuit board 7 and the alarm speaker 9 are also held and fixed at the same time. The circuit board 7 is also screw-fixed by screw holes (see FIG. 4) provided at the relative positions of the screw mounting portions 19 and 22. Further, a pull string (not shown) is attached to the pull string locking portion 20 of the push button 11.

  At this time, as shown in FIGS. 5A and 5B, the center portion of the flat surface portion 8 a of the shaft portion 8 of the push button 11 is pressed by the pressing surface portion 13 a of the pressing member 13. The closeness between the flat surface portion 8 a of the shaft portion 8 and the pressing surface portion 13 a of the pressing member 13 is made constant when the main body 1 and the cover 2 are assembled.

  Next, after assembling the main body 1, the cover 2, the circuit board 7, and the like, the main body 1 is engaged and fixed to a mounting plate 30 attached to the ceiling with screws or the like.

  When the fire detection unit 4 detects a fire, the fire alarm assembled in this way notifies the fire by the sound of the alarm speaker 9 or the lighting of the fire light 6. At this time, when the push button 11 is pressed or a pulling string (not shown) is pulled, the push button 11 is pushed, and the convex portion 10 of the push button 11 is mounted on the circuit board 7. The alarm speaker 9 stops ringing. Then, the push button 11 returns to the original position.

The operation of the push button 11 at this time will be described with reference to FIG.
6A is a normal state where the push button 11 is not pressed, FIG. 6B is a state where the push button 11 is pressed, and FIG. 6C is an enlarged view of portions C and D in FIG. 6B. It is.
In FIG. 6 (c), one long side of the pressing surface portion 13a of the pressing member 13 positioned in the direction in which the shaft portion 8 rotates in the direction of the arrow from the center line 31 passing through the center O of the shaft portion 8 and orthogonal to the plane portion 8a. The distance to the (edge) 13c is L1, the distance from the center line 31 to the other long side (edge) 13c of the pressing surface portion 13a is L2, and the short side distance of the rectangular flat portion 8a of the shaft portion 8 is L3. . In addition, in FIG.6 (c), the clearance gap between the plane part 8a of the axial part 8 and the pressing surface part 13a of the pressing member 13 is for description, and there is actually no gap.

  When the push button 11 is pressed, the push button 11 is pushed to change from the state shown in FIG. 6A to the states shown in FIGS. 6B and 6C. The dotted line is the position of the push button 11 before the push button 11 is pushed. When the push button 11 is pushed in the direction D1 with the force F1 as shown in FIGS. 6B and 6C, the shaft portion 8 of the push button 11 rotates in the arrow direction, and the rectangular flat portion 8a of the shaft portion 8 is obtained. Compressively contacts the long side (edge) 13c of the pressing surface portion 13a of the pressing member 13, and a reaction force F2 is generated. Therefore, when the pressing operation of the push button 11 is stopped, the push button 11 returns to the original direction D2.

  Here, the feeling of operation of the push button 11 can be adjusted by adjusting the dimensions of L1 and L2, and L1 <L2, L1 + L2 <L3, and the long side (edge) of the pressing surface portion 13a of the pressing member 13 ) 13c and 13c should be in contact with each other within the rectangular plane portion 8a of the shaft portion 8 (L1 + L2 should be installed inside L3).

In this way, by setting L1 + L2 <L3, the operational feeling of the push button 11 is larger than necessary as when the pressing surface portion 13a of the pressing member 13 is applied to the entire flat surface portion 8a of the shaft portion 8 of the push button 11. In addition, by setting L1 <L2, for example, even if an assembly error occurs, the L2 portion exists reliably, and a reaction force can be reliably generated when the push button is pressed. .
Note that L1 = 0 may be used.
Further, it is better to avoid L2 <L1 because the movement is on the side where the push button 11 is pressed.

In the present embodiment, the cross-sectional shape of the shaft portion 8 of the push button 11 is a semi-cylindrical shape, but is a substantially D-shape lacking a part of a circle, and a linear portion facing the arc portion (arc surface portion 8b). However, you may make it make the outline of the plane part 8a of the axial part 8. FIG.
Moreover, although it was set as a pair of bearing groove part 12, the groove | channel formed integrally as a groove | channel may be sufficient as the middle of a pair of bearing groove part 12. FIG.

It is a lineblock diagram of a fire alarm which shows an embodiment of this invention. It is a disassembled perspective view of the fire alarm which shows embodiment of this invention. FIG. 3 is an enlarged view of a main part of FIG. 2. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a principal part enlarged view of FIG. It is operation | movement explanatory drawing of the push button of the fire alarm which shows embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Main body, 2 cover, 3 housing | casing, 7 circuit board, 8 axial part, 8a plane part, 11 push button, 12 bearing groove part, 13 pressing member, 13a pressing surface part, 31 centerline

Claims (5)

A switch provided on a circuit board housed in a housing composed of a main body and a protective cover, and a shaft portion rotatably supported by a bearing groove provided in the protective cover, and the switch for operating the switch In a fire alarm with a button,
A fire alarm device comprising a pressing member for pressing the shaft portion of the push button from a side facing the opening of the bearing groove. The shaft portion of the push button is formed with a rectangular flat portion on the opening side of the bearing groove in a state of being mounted in the bearing groove,
2. The fire alarm according to claim 1, wherein the pressing member is provided with a pressing surface portion that forms a rectangular flat surface opposite to the flat surface portion provided on the shaft portion of the push button. vessel. The flat portion of the shaft portion of the push button and the pressing surface portion of the pressing member are rectangular.
The long side of the pressing surface portion of the pressing member is shorter than the long side of the flat portion of the shaft portion, and the pressing surface portion is provided substantially opposite to the central portion of the flat portion of the shaft portion. The fire alarm according to claim 2. The flat portion of the shaft portion of the push button and the pressing surface portion of the pressing member are rectangular.
When the push button is pressed, the distance from the center line perpendicular to the plane portion of the shaft portion to one long side of the pressing surface portion positioned in the direction in which the shaft portion rotates is L1, and the center line When the distance to the other long side of the pressing surface portion is L2, and the short side distance of the rectangular flat portion of the shaft portion is L3,
L1 <L2
L1 + L2 <L3
The fire alarm according to claim 2 or 3, characterized in that:   The fire alarm according to any one of claims 2 to 4, wherein the shaft portion has a semi-cylindrical cross section, and a straight portion facing the arc portion forms an outline of a flat portion of the shaft portion. .

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