TWI474289B - Fire alarm device - Google Patents

Description

Fire alarm

The present invention relates to a fire alarm that mounts a fire alarm body on a mounting base.

The fire alarm can be installed in a fire alarm of a single-family house, and is installed on a ceiling or a wall mounting base; it is installed on the mounting base separately from the installation, and detects smoke or heat. The fire alarm body of the fire is constituted (for example, refer to Patent Document 1).

In such a fire alarm, the installation of the fire alarm body to the mounting base is generally performed by a rotary locking mechanism. The rotary locking mechanism is composed of, for example, a tooth portion provided on the back side of the fire alarm main body and a tooth receiving portion provided on the base side and receiving a tooth portion on the back side of the fire alarm main body, and Positioning the tooth portion and the tooth receiving portion, fitting the fire alarm body to the mounting base, rotating (relatively rotating), and engaging the tooth portion with the tooth receiving portion, thereby fixing the fire alarm body to The base is attached, and in the rotation lock state, the fire base body and the fire alarm body can be released by rotating the fire alarm body relative to the mounting base in a direction opposite to the engagement direction of the tooth portions. Engage.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2003-099871

However, as described above, by the rotation of the fire alarm main body with respect to the attachment base, the fire alarm main body can be easily engaged or disengaged, and the fire alarm main body may be detached or intentionally stolen due to an earthquake or the like. . Therefore, it is desirable to prevent problems caused by the fall of the fire alarm body or intentional theft due to an earthquake or the like as needed.

An object of the present invention is to provide a fire alarm that can easily prevent falling off or intentional theft of a fire alarm body due to an earthquake or the like as needed.

The fire alarm of the present invention is a fire alarm body that is detachably mounted on a mounting base provided on a setting surface by a screwing structure using a locking screw and a locknut, and is fixed to the mounting base The fire alarm device includes: two holding walls that are respectively protruded from the back panel of the fire alarm body and that cover both end faces of the side surface of the lock nut; and are provided on the mounting base a side plate of the seat, and a cutout portion enclosing the locking screw head; and a side of the side of the lock nut that intersects the end surface, the retaining wall that is disposed in contact with an edge of the mounting base The protrusion of the upper end of the side.

The fire alarm of the present invention has an effect that when the lock nut and the lock screw are screwed, the fire alarm is closer to the outer peripheral side of the fire alarm main body, but the upper end of the wall of the outer side of the fire alarm of the holding wall is provided. There is a protrusion, so the locknut does not have a snap-off with the protrusion, and does not idling, and can be spiraled with the locking screw. Further, since the retaining wall is entirely wider than the width of the locking screw, it is not easy to idle.

[Formation for carrying out the invention]

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a front elevational view and a side elevational view of a fire alarm of the best mode for carrying out the invention. 2 is a perspective view of the mounting base of FIG. 1. 3 is a perspective view of the fire alarm body of FIG. 1. 4 is a perspective view of the back panel and the protective cover of the fire alarm body of FIG. 3. Fig. 5 is an enlarged perspective view of the stopper member and the tooth portion of the present invention.

Further, the description of the present invention will be described in which the mounting base 3 is attached to the ceiling, with the vertical direction of the ceiling as the vertical direction and the ceiling side as the upper side. Therefore, the fire alarm body 2 is rotated in a plane parallel to the ceiling.

As shown in FIG. 1, the fire alarm 1 of the best mode for carrying out the present invention includes a fire alarm main body 2 and a mounting base 3.

The attachment base 3 is attached to a ceiling or the like where the fire alarm 1 is attached by a mounting member such as a screw. Further, as shown in FIG. 2, the mounting base 3 has a cylinder having a low bottom height and has a disk-shaped bottom plate 4 and a cylindrical side plate 5.

In the bottom plate 4, the rib 6 concentric with the side plate 5 protrudes substantially at the inner side of the side plate 5, and is provided with a through hole 7 through which the screw passes. Further, the tooth support portion 8 is provided at two places of the rib 6.

Between the tooth support portion 8 and the bottom plate 4, there is a flat bottom buckle portion 9 having a predetermined gap; and a direction for mounting the fire base body 2 in the mounting base 3 (hereinafter referred to as mounting) The direction of rotation, when positioned at a predetermined position, blocks the stop of the fire alarm body 2 from further blocking.

The side plate 5 is provided with a thin plate portion 11 which is thin in thickness, and when the fire alarm body 2 and the mounting base 3 are fixed by the locking screw and the lock nut for theft prevention, the inner bag is locked when the thin plate portion 11 is bent and removed. The notch portion of the screw head (the notch portion 63 of Figs. 6 and 7).

As shown in FIG. 3 and FIG. 4, the fire alarm main body 2 holds the smoke sensing unit 13, the control board 14, the speaker 15, etc. of an example of the fire sensing unit by the screwing of the protective cover 16 and the back panel 17. Functional components.

The protective cover 16 is formed of a funnel shape by the bottom plate 16a and the side plate 16b, and is provided with a column 18 and a back plate 17 which are provided with screw holes for screwing the back plate 17, and surrounds and closes the opening 19 so that foreign matter does not occur. The surrounding wall 20 that affects the functional members of the smoke sensing portion 13, the control panel 14, the speaker 15, and the like is entered from the opening 19 provided in the back panel 17.

The surrounding wall 20 has two side wall portions extending in a direction slightly orthogonal from the side plate 16b, and an inner side wall portion connecting the front end sides of the two side wall portions. The surrounding wall 20 can prevent the foreign matter such as a screw from entering the inside of the surrounding wall 20 and coming off the inside of the protective cover 16 when entering the opening 19 .

In the surrounding wall 20, the restricting ribs 22 are integrally provided. When the restricting rib 22 is superposed on the back panel 17, the top portion of the side wall portion (mounting direction side) of the surrounding wall 20 directly below the tooth portion 21 of the back panel 17 extends in the direction of the back panel 17. The limit limiting rib 22 is such that when the fire alarm body 2 to which the battery is not mounted is rotated in the mounting direction with respect to the mounting base 3, the stopper piece 23 can be made to face the mounting direction by the lower buckle portion 9 of the tooth support portion 8. When it is pressed in the reverse direction, it does not move, and the stopper can cause the sheet supporting portion 25 to abut against the regulating rib 22 without moving in the direction of the tooth portion 21. The restricting rib 22 is protruded into the opening 19.

Further, in the surrounding wall 20, the regulating piece 26 is integrally provided. The restricting piece 26 is a wall portion extending from the side wall portion (mounting direction side) of the surrounding wall 20 where the restricting rib 22 is provided, in a direction slightly orthogonal to each other, and the front end portion in the mounting direction is connected to the side wall portion of the surrounding wall 20 Strengthened by the wall. When the restriction piece 26 is superposed on the back panel 17, it is positioned directly below the stopper supporting portion 25 of the stopper member 24, and its top portion faces the mounting direction, is flat on the rear side, and is inclined on the front side. When the battery is attached to the battery housing portion 27, the stopper supporting portion 25 is inclined and deformed in the rotational direction (mounting direction) to lower the front side. Therefore, the top of the restricting piece 26 is chamfered to allow the deformed portion to retract.

On the other hand, when the battery is not attached to the battery storage unit 27, when the tooth support portion 8 of the attachment base 3 presses the stopper piece 23 from directly above, the stopper piece support portion 25 abuts against the restriction piece 26 Since the flat portion of the top portion is not depressed, the stopper piece 23 is locked by the lower buckle portion 9 of the tooth support portion 8 of the attachment base 3 when the fire alarm body 2 is rotated in the mounting direction. In the manner of not rotating further, it is possible to prevent accidental mounting of the fire alarm body 2 without the battery installed to the mounting base 3.

The back panel 17 has a disk-shaped intermediate plate 30 and a cylindrical side plate 31 that abuts against the outer periphery of the intermediate plate 30.

The intermediate plate 30 is provided with openings 34 and 35 that are opened, and the counterpart connector can be connected from the side of the mounting base 3 to the battery connector 32 mounted on the control board 14 and to the connector for reporting. 33; guide protrusions (an example of adhesion guide) 36, 37 for guiding the machine panel 41 to the pasting position; and holes 38 opposed to the column 1 having the screw holes of the protective cover 16; holding the locknut 61 against loosening a nut holding portion 39; a battery housing portion 27 recessed in a semi-cylindrical shape on the side of the protective cover 16; and a holding member 40 that holds the battery so that the battery does not fall from the mounting position when the battery is mounted on the battery housing portion 27; When the battery is attached to the battery housing portion 27, the stopper member 24 of the stopper piece 23 that does not reach the position of the lower fastening portion 9 of the tooth support portion 8 of the attachment base 3 is retracted.

The fire alarm 1 includes two types of models for transferring the report to the external device and the model for not transmitting the report, and the connector 33 for the control board 14 is attached to the device for reporting. Further, there are two types of the machine panel 41 that are attached to the back panel 17. In the present invention, the size of the machine panel 41 is set to be different between the type of the report and the type of the non-reported machine, and the guide projections 36 and 37 used for the attachment are also provided in two types.

The nut holding portion 39 is a lock nut that is held by the notch portion 42 of the side plate 31 and inserted into the inner side to be engaged with the locking screw in the radial direction. Moreover, the nut holding portion 39 is a section from the intermediate plate 30 The figure is standing upright and has a pair of retaining walls 43 that respectively cover the opposite end faces of the locknut. The retaining wall 43 is a height above the width of the locknut used. Further, the holding wall 43 is provided with a projection 44 at which the lock nut cannot be easily detached from the upper end of the wall portion into which the lock nut can be inserted.

As shown in FIG. 5, the stopper member 24 has a bottom portion 45 that is in contact with the semi-cylindrical side surface of the battery of the battery housing portion 27, and two slits 46 provided in parallel with the semi-cylindrical diameter direction. a cantilever beam 47 supported at one end of the bottom portion 45 of the battery housing portion 27; a stopper piece supporting portion 25 extending from the free end 48 of the cantilever beam 47 toward the axial direction of the battery housing portion 27; and a step along the stopper piece supporting portion 25 A stop piece 23 in which the side plates 31 stand up. A reinforcing rib 49 is provided in the stopper piece 23.

The stopper piece 23 is in the direction in which the fire alarm body 2 is rotated when the battery is not attached to the battery storage portion 27 (hereinafter referred to as when no battery is attached) when the fire alarm body 2 is attached to the attachment base 3 (hereinafter In addition, when the fire alarm main body 2 is detached from the attachment base 3, the direction in which the fire alarm main body 2 is rotated is referred to as a direction of removal.), the guide portion located at the tooth portion 21. The front side of the stopper piece 23 is positioned such that the top of the stopper piece 23 is positioned higher than the lower buckle portion 9 of the tooth support portion 8.

The cantilever beam 47 has an arc-shaped beam 51 having a diameter smaller than a semi-cylindrical radius of the battery housing portion 27 and a flat beam 52 extending from the arc-shaped beam 51. The end on the opposite side of the connecting end of the arcuate beam 51 of the flat beam 52 is a free end 48.

Next, when the battery is attached to the battery housing portion 27, since the arc-shaped beam 51 is inclined in a direction approaching the protective cover 16, the free end 48 sinks in a direction approaching the protective cover 16 and approaches the side plate 31. Inner side. At this time, since the escape portion 53 is provided on the inner side surface side of the side plate 31, even if the free end 48 approaches the inner side surface of the side plate 31, it does not come into contact with the side plate 31 and can be deformed.

The stopper piece supporting portion 25 extends from the free end 48 of the cantilever beam 47 in the direction in which it is removed along the inner side surface of the side plate 31. Then, when the free end 48 of the cantilever beam 47 sinks in the direction in which the protective cover 16 approaches, when the inner side surface of the side plate 31 is deformed and approaches, the stopper piece supporting portion 25 is deformed so that the position connected to the cantilever beam 47 becomes The most sinking position, while the sinking on the opposite side is the smallest. Therefore, the stopper piece 23 is in the mounting direction downward, and is inclined toward the protective cover 16 while being inclined. At this time, the top of the stopper piece 23 is lower than the lower buckle portion 9 of the tooth support portion 8. Therefore, when the fire alarm main body 2 is pressed against the attachment base 3 and rotated in the mounting direction, the lower fastening portion 9 of the tooth support portion 8 passes through the top of the stopper piece 23 and the guide portion 50 of the tooth portion 21. Since the guide portion 50 of the tooth portion 21 is fitted between the two, the fire alarm body 2 can be prevented from falling from the attachment base 3.

Although the top of the stopper piece 23 is flat from the front end to the center in the mounting direction, the chamfering process is performed so that the take-out terminal which is lowered from the center is the lowest. When the chamfering process is performed, when the fire alarm main body 2 is removed from the attachment base 3, since the gap between the top of the stopper piece 23 and the lower buckle portion 9 of the tooth support portion 8 is wide, the smooth start can be started. Rotate in the ground.

The side plate 31 is provided with a tooth portion 21 at a diagonal position centering on the center of the intermediate plate 30; a side portion 31 is thinned from the inside; when the stopper member 24 is deformed, the escape portion 53 is not hindered from the operation; And a notch portion 42 of the locking screw that can stop the rotation of the fire alarm body 2.

The tooth portion 21 has a guide portion 50 extending from a top portion of a predetermined length toward the inner side of the top portion of the side plate 31 facing the mounting base 3 side by a predetermined thickness; and when the fire alarm body 2 is rotated in the mounting direction, The lower buckle portion 9 of the tooth support portion 8 abuts to restrict the restriction portion 54 in which the fire alarm body 2 is further rotated.

Next, a case where the fire alarm main body 2 to which the battery is not mounted is attached to the mounting base 3 will be described.

Since the battery is not mounted, the force is not applied to the cantilever beam 47 of the stopper member 24, so that the top of the stopper piece 23 is positioned above the lower buckle portion 9 of the tooth support portion 8 of the attachment base 3, and the fire alarm body 2 is directed toward When the mounting direction is rotated, the side end surface of the stopper piece 23 abuts against the lower buckle portion 9. Therefore, since the fire alarm main body 2 cannot be further rotated in the mounting direction, the fire alarm main body 2 cannot be attached to the mounting base 3.

Next, a case where the fire alarm main body 2 to which the battery is attached is attached to the mounting base 3 will be described.

When the battery is attached to the battery housing portion 27, the force is applied to the cantilever beam 47 in the direction of the protective cover 16, and the free end 48 of the cantilever beam 47 is deformed toward the side close to the protective cover 16, and is deformed to the side plate. The inner side of 31 is close. Thus, the stopper piece supporting portion 25 is deformed so that the position connected to the cantilever beam 47 becomes the most sinking position, and the sinking on the opposite side is the smallest. Therefore, the stopper piece 23 is in the mounting direction downward, and is inclined toward the protective cover 16 while being inclined. At this time, since the position of the top of the stopper piece 23 is located below the lower buckle portion 9 of the tooth support portion 8, the lower buckle portion 9 of the tooth support portion 8 passes over the top of the stopper piece 23, and the tooth portion 21 The guide portion 50 is fitted to mount the fire alarm body 2 to the mounting base 3.

The fire alarm of the present invention is constituted by a tooth support portion 8 integrally formed with the attachment base 3, and a tooth portion 21 and a stopper member 24 integrally formed with the back panel 17 of the fire alarm body 2 as a lock mounting. The fire alarm body 2, which does not mount the battery, cannot be attached to the battery lock mechanism of the mounting base 3, so that only the parts of the battery lock mechanism are not required, and the assembly operation of the battery lock mechanism is not required.

Further, since the lower portion of the stopper piece 23 which is pressed in the opposite direction to the attachment direction by the lower buckle portion 9 of the tooth support portion 8 is a restriction rib 22 which is integrally provided with the surrounding wall 20 of the protective cover 16, Since the movement in the opposite direction to the mounting direction is restricted, it is possible to prevent the stopper piece 23 from being pressed in the opposite direction to the mounting direction and being broken when the battery is not mounted.

Further, the stopper piece 23 pressed by the lower buckle portion 9 of the tooth support portion 8 in the downward direction is flattened at the top of the restriction piece 26 due to the integral with the surrounding wall 20 of the protective cover 16 provided on the lower side thereof. In part, the movement to the lower side is restricted, so that the stopper piece 23 can be prevented from retracting toward the protective cover 16 side, and the case where the fire alarm main body 2 in which the battery is not mounted is prevented from being mistakenly attached to the attachment base 3.

In addition, even if the fire alarm main body 2 to which the battery is not attached is forcibly rotated in the mounting direction due to a design error or the like, and the tooth portion 21 is fitted into the tooth support portion 8, the tooth portion 21 side is chamfered. Further, since the stopper piece 23 is narrowed toward the upper end, it can be easily removed from the attachment base 3 by rotating the fire alarm main body 2 in the removal direction.

Figure 6 is a cross-sectional view of one of the retaining walls of the present invention. Fig. 7 is a view showing a state in which a lock nut is inserted into a holding wall and a locking screw is inserted and screwed.

The locknut holding portion 39 is shown in detail in FIGS. 6 and 7, and has a longitudinal section from the intermediate plate 30 of the back panel 17, and a cross section of the opposite end faces of the lock nut 61 is slightly omitted. Two retaining walls 43 in the shape of a letter. Moreover, the retaining wall 43 not only covers the end faces of the locknuts 61 but also covers a part of the joined side faces by the sides.

Further, when the retaining wall 43 is provided with the insertion lock nut 61, the projection 44 that protrudes inward from the upper end of the wall from the side of the side plate 31 side of the lock nut 61 on the side of the end surface. That is, the projection 44 of the retaining wall 43 is provided at the upper end of the wall portion on the outer peripheral side of the fire alarm body 2.

Then, the locknut 61 is inserted between the two holding walls 43 from above. Further, the upper end of the side wall facing the side opposite to the side plate 31 of the locknut 61 is chamfered, and the slight inclination of the work can be easily inserted between the retaining walls 43.

Further, when the lock nut 61 is screwed into the lock screw 62, it abuts against the wall of the retaining wall 43 on the side plate 31 side. At this time, since the end surface facing upward is hidden under the projection 44, even if the lock nut 61 is pulled up, it does not fall out from between the retaining walls 43.

Next, the manner in which the fire alarm body 2 is fixed to the mounting base 3 by the locking screw 62 and the lock nut 61 will be described so that the fire alarm body 2 does not fall or is not easily stolen during an earthquake.

At the time of fixing, the front side is held, and the thin plate portion 11 of the attachment base 3 is broken by a tool such as a pliers to form the notch portion 63, and then attached to the attachment portion.

Next, the locknut 61 is inserted between the retaining walls 43 of the lock nut holding portion 39 of the fire alarm body 2. Then, as described above, the fire alarm body 2 to which the battery is attached is attached to the mounting base 3.

Next, the locking screw 62 is inserted from the notch portion 63 of the attachment base 3 and the notch portion 42 of the back plate 17, and is screwed to the lock nut 61 inserted between the holding walls 43. As a result, the head 62a of the locking screw 62 is blocked by the cutout portion 42. As a result, the head portion 62a of the locking screw 62 is enclosed in the cutout portion 63 of the mounting base 3, and even if the fire alarm body 2 is to be rotated in the direction of removal, the head 62a of the locking screw 62 will abut The base 3 is mounted so that the fire alarm body 2 cannot be rotated, and theft can be prevented.

Further, even if the fire alarm main body 2 vibrates due to an earthquake, it can be fixed to the attachment base 3 by the lock screw 62 and the lock nut 61, so that it can be prevented from falling off and falling.

The fire alarm 1 of the present invention is a screwing structure using a locking screw 62 and a locknut 61, and is attached to the fire alarm body 2 that is attached to the mounting base 3 provided on the installation surface, and is fixed. The fire alarm 1 of the above-described mounting base 3 includes a rear panel 17 that is standing from the fire alarm main body 2, and covers both end faces of the side surface of the lock nut 61 including the lock nut. Two retaining walls 43; a cutout portion 63 provided on the side plate 31 of the mounting base 3 and enclosing the head 62a of the locking screw 62; and a side where the side surface of the lock nut 61 intersects the end surface A projection 44 provided at an upper end of the side of the holding wall 43 that is in contact with the side of the side plate 31 of the mounting base 3 is provided. In this way, since the retaining wall 43 is provided with the projection 44 at the upper end of the wall portion on the outer peripheral side of the fire alarm main body 2, the locknut 61 can prevent the lock nut 61 from being held from the retaining wall 43 even if it is locked by the locking screw 62. The situation of falling off.

Further, the height of the retaining wall 43 exceeds the width of the lock nut 61. In the locknut retaining portion 39, by the width of the lock nut 61 or more The retaining wall 43 retains both end faces of the locknut 61, and since the downwardly facing end face is in contact with the back panel 17, the locking screw 62 is locked to the locknut 61 even when the lock nut 61 is applied The force of rotation can also be maintained by the retaining wall 43, and the rotation of the locknut 61 can be prevented without idling.

Further, in the above-described embodiment, the notched portion 63 is formed by means of a tool such as a forceps, and the thin portion 11 of the attachment base 3 is broken. However, as shown in Fig. 8, the cut for the mold release is used. The 11a is provided in the thin portion 11, and the thin portion 11 can be easily broken. Further, the cutout portion 63 may be formed on the mounting base 3 from the beginning.

1. . . Fire alarm

2. . . Fire alarm body

3. . . Mounting base

4. . . Bottom plate

5. . . Side panel

6. . . rib

7. . . hole

8. . . Tooth support

9. . . Lower button

10. . . Stop

11. . . Thin plate

13. . . Smoke sensing department

14. . . Control panel

15. . . speaker

16. . . protection cap

17. . . Back panel

18. . . column

19. . . Opening

20. . . Surrounding wall

twenty one. . . Tooth

twenty two. . . Limit rib

twenty three. . . Stop piece

twenty four. . . Stop member

25. . . Stop plate support

26. . . Limit piece

27. . . Battery storage unit

30. . . Medium plate

31. . . Side panel

32. . . Battery connector

33. . . Transmitting connector

34, 35. . . Opening

36, 37. . . Guide protrusion

38. . . hole

39. . . Nut retaining part

40. . . Holding member

41. . . Machine panel

42. . . Cutting section

43. . . Keep the wall

44. . . Protrusion

45. . . bottom

46. . . Slot

47. . . Cantilever beam

48. . . Free end

49. . . Reinforcement rib

50. . . Guide

51. . . Arc-shaped beam

52. . . Flat beam

53. . . Retreat

54. . . Restriction department

61. . . Locknut

62. . . Locking screw

63. . . Cutting section

Fig. 1 is a front view and a side view of a fire alarm of a best mode for carrying out the invention.

FIG. 2 is a perspective view of the mounting base of FIG. 1. FIG.

FIG. 3 is a perspective view of the fire alarm body of FIG. 1. FIG.

Fig. 4 is a perspective view of a back panel and a protective cover of the fire alarm body of Fig. 3;

Fig. 5 is an enlarged perspective view showing a stopper member and a tooth portion of the present invention.

Fig. 6 is a cross-sectional view showing a retaining wall of the present invention.

Fig. 7 is a view showing a state in which a lock nut is inserted into a holding wall, and a locking screw is inserted and screwed.

Fig. 8 is a perspective view showing a modification of the attachment base.

5. . . Side panel

31. . . Side panel

44. . . Protrusion

43. . . Keep the wall

63. . . Cutting section

42. . . Cutting section

30. . . Medium plate

Claims (2)

A fire alarm is a screw structure using a locking screw and a locknut, and is attached to a fire alarm body that is separately mounted on a mounting base provided on a setting surface, and is fixed to the fire of the mounting base The alarm device includes: two holding walls that respectively protrude from a back panel of the fire alarm body and that cover two end faces of the side surface of the lock nut; and a side plate that is disposed on the mounting base And a cutout portion of the head portion of the locking screw; and a side of the holding wall that is disposed in a side of the locking nut that is adjacent to a side surface of the mounting base The upper end of the protrusion, the holding wall, the side of the wall where the side surface of the lock base is opposite to the side surface of the mounting base opposite to the protrusion, the upper end portion of the wall is contacted angle. The fire alarm according to claim 1, wherein the height of the retaining wall exceeds a width of the lock nut.