JP4979778B2 - Fall prevention device - Google Patents

Description

  The present invention relates to an apparatus for preventing an article from falling, and in particular, prevents an article from falling when a fixing member for fixing the article is removed due to damage or the like while suspended from a ceiling. The present invention relates to a device having a function.

  Conventionally, an attachment for suspending an article such as a speaker from a ceiling is known (see, for example, Patent Document 1). In this conventional fixture, the fixture is screwed through the screw hole of the mounting portion to the ceiling, and the fixture is screwed into the speaker through the screw hole of the speaker support portion. Thus, conventionally, when a speaker is fixed to a ceiling using a fixture, a fixing member such as a screw is used.

Japanese Patent Laid-Open No. 11-341578

  However, in conventional fixtures, screws are used to fix the speaker to the ceiling. However, if the screws are used for many years without any regular maintenance, the screws may loosen or deteriorate over time. May be damaged. In the unlikely event that all the screws fixing the speaker to the ceiling are removed due to damage or the like, there is a problem that the speaker falls from the ceiling.

  The present invention has been made to solve the above-described conventional problems. Even if a fixing member for fixing the article in a state where it is suspended from the ceiling is detached from the article by any chance, the article is provided. It aims at providing the fall prevention device which can prevent that falls from a ceiling.

  The fall prevention device of the present invention is attached to the ceiling and supports the article in a state suspended from the ceiling, and is attached to the article via the attachment member and suspended from the ceiling. A fixing member that fixes the article, and a locking member that is provided on the attachment member or the article and that locks the attachment member and the article together in a state where the fixing member is detached from the article. The gravity center position of the article fixed in a state of being suspended from the ceiling by the fixing member, and the attachment member and the article are engaged with each other by the locking member in a state in which the fixing member is detached from the article. The locking position to be stopped has a configuration that is shifted from each other in the vertical direction.

  With this configuration, even if the fixing member for fixing the article in a state where it is suspended from the ceiling is removed from the article by any chance, the attachment member and the article are locked by the locking member. Can be prevented from falling. In addition, in this case, the center of gravity position of the article fixed in a state where it is suspended from the ceiling by the fixing member and the locking position of the mounting member and the article when the fixing member is detached are shifted from each other in the vertical direction. Therefore, when the fixing member is removed, the article moves (rotates about the locking position) to a position where the center of gravity of the article is directly below the locking position. In this way, before and after the fixing member is removed, the position or inclination of the article suspended from the ceiling changes, and as a result, the appearance of the article (how the article looks) changes. Therefore, the user can easily notice that the fixing member has been detached based on a change in the appearance of the article (how the article is seen).

  In the fall prevention device of the present invention, the article is a speaker. When the fixing member is attached and suspended from the ceiling, the speaker surface of the speaker faces obliquely downward, and the fixing member is In a state where the speaker is detached and locked with the mounting member, the speaker surface of the speaker is configured to face obliquely upward.

  With this configuration, even if the fixing member is detached from the speaker, the speaker can be prevented from falling. When hanging heavy objects such as speakers from the ceiling, in order to efficiently support heavy objects (speakers) (so that fixing strength by the fixing member does not need to be increased too much) Usually, the fixing position of the mounting member and the speaker and the position of the center of gravity of the speaker are fixed in the vertical direction. In this case, the locking position of the mounting member and the speaker and the speaker are intentionally set. The position of the center of gravity is shifted in the vertical direction. Therefore, when the fixing member is removed, the speaker moves (rotates about the locking position) to a position where the center of gravity position of the speaker is directly below the locking position. Before and after detachment, the position and inclination of the speaker suspended from the ceiling change, and as a result, the appearance of the speaker (how the speaker looks) changes. In this case, the speaker surface faces obliquely downward when suspended from the ceiling (state where the fixing member is not detached), and the speaker surface faces obliquely upward when the fixing member is detached. Therefore, the user can easily notice that the fixing member has been detached based on the change in the appearance of the speaker (how the article is seen). Further, in this case, since the direction of the speaker surface changes, the way in which sound is transmitted from the speaker also changes. Therefore, the user can also recognize that the fixing member has been detached based on a change in sound from the speaker (how to hear the sound).

  Further, in the fall prevention device of the present invention, the locking member is formed with a base portion attached to an upper portion of the article, and protruded upward from the base portion, and a tip portion is bent and the attachment portion is attached. A hook portion for locking to a locked portion provided on the member, and the hook portion is in a state where the fixing member is detached from the article and the hook portion and the locked portion are locked to each other. It can be deformed so as to be bent with respect to the base portion by an external force applied to the article, and the direction of the deformation is a direction corresponding to the direction in which the tip portion of the hook portion is bent. The structure is such that it is possible to prevent the hook portion and the locked portion from being unlocked by the deformation.

  With this configuration, when an external force due to an earthquake or the like is further applied in a state where the fixing member has been detached, the article is shaken by the external force, and the hook portion is deformed to be bent with respect to the base portion. Become. In this case, the direction of deformation corresponds to the direction in which the tip of the hook portion is bent, and this deformation can prevent the hook portion and the locked portion from being unlocked. Therefore, even if an external force due to an earthquake or the like is applied in the state that the fixing member has been removed, measures are taken to prevent the hook part and the locked part from being unlocked, and higher safety is achieved. Sex can be obtained.

  In the fall prevention device of the present invention, the hook portion is folded back from a first vertical member formed so as to extend upward from the base portion and a tip portion of the first vertical member. A second vertical member formed so as to extend downward, and the locked portion is housed between the first vertical member and the second vertical member, The minimum value A of the width of the locked portion is smaller than the width B between the first vertical member and the second vertical member, and the maximum value C of the width of the locked portion is the first value. The vertical member is larger than the width B between the vertical member and the second vertical member.

  With this configuration, the minimum value A of the width of the locked portion is smaller than the width B between the first vertical member and the second vertical member, so that the locked portion is the first vertical length of the hook portion. It can rotate in the state accommodated between the member and the 2nd vertical member. Therefore, when an external force is applied due to an earthquake or the like in a state where the fixing member has been disengaged (a state where the hook portion and the locked portion are locked), and the article is shaken by the external force, the locked portion is It rotates a little in the state accommodated between the 1st vertical member and 2nd vertical member of the part. At this time, the attachment member is slightly inclined with respect to the hook portion in accordance with the rotation of the locked portion with respect to the hook portion. In this case, since the maximum value C of the width of the locked portion is larger than the width B between the first vertical member and the second vertical member, the locked portion has a certain angle θ (B = When it is rotated by an angle θ) that becomes C cos θ, it is caught between the first vertical member and the second vertical member, and cannot be rotated any further. In this state, if the article is further shaken by an external force such as an earthquake, the external force is amplified by the so-called “lever principle” and acts on the hook portion as a force that causes the hook portion to be bent with respect to the base portion. To do. Therefore, when an external force due to an earthquake or the like is further applied in a state where the fixing member has been detached, the external force is amplified using the “lever principle” and the hook portion is bent with respect to the base portion. Can be deformed. As described above, the direction of the deformation corresponds to the direction in which the tip of the hook portion is bent, and this deformation prevents the hook portion and the locked portion from being unlocked. be able to.

  In the fall prevention device of the present invention, the locking member has a configuration manufactured using a metal material having ductility.

  With this configuration, since the locking member is manufactured using a ductile metal material (for example, a sheet metal), the hook portion can be plastically deformed when it is bent so as to be bent with respect to the base portion. It is. In plastic deformation, the deformed state remains even after the external force is removed. Therefore, even after the external force due to an earthquake or the like is lost, the hook portion remains in a deformed state, and it is possible to prevent the hook portion and the locked portion from being unlocked.

  In the fall prevention device of the present invention, the locking member or the article has a configuration in which a wall portion that prevents the hook portion from being deformed in a direction opposite to the deformation direction is provided. Yes.

  With this configuration, when the hook portion is deformed in a direction opposite to the direction in which the tip end portion of the hook portion is bent (direction in which the hook portion and the locked portion are easily released), the wall portion deforms the hook portion. Is blocked. Therefore, it is possible to prevent the hook portion and the locked portion from being unlocked due to the deformation in the opposite direction.

  The fall prevention device of the present invention includes a fall prevention member for the article, wherein one end of the fall prevention member is attached to the ceiling or the attachment member, and the other end of the fall prevention member is attached to the article. It has the composition which can be.

  With this configuration, it is possible to prevent the article from falling even with the fall prevention member. In this case, a triple fall prevention structure including a fixing member, a locking member, and a fall prevention member is provided, and higher safety can be obtained.

  The present invention provides a fixing member for fixing the article in a suspended state from the ceiling by providing a locking member that locks the mounting member and the article with the fixing member detached from the article. Even if it is detached from the above, it is possible to provide a fall prevention device having an effect that the article can be prevented from falling.

The perspective view which shows the structure of the fall prevention apparatus of this invention The disassembled perspective view for demonstrating the principal part of the fall prevention apparatus of this invention The notch perspective view for demonstrating the principal part of the fall prevention apparatus of this invention Side sectional view which shows the fall prevention apparatus (state fixed with the fixing member) of this invention Side sectional view showing the fall prevention device of the present invention (state where the fixing member is detached) Explanatory drawing which shows a mode that a hook part deform | transforms so that it may bend with respect to a base part. The perspective view which shows the structure of the modification 1 of the fall prevention apparatus of this invention. The perspective view which shows the structure of the modification 2 of the fall prevention apparatus of this invention The perspective view which shows the structure of the modification 3 of the fall prevention apparatus of this invention. Sectional drawing which shows the structure of the modification 3 of the fall prevention apparatus of this invention The perspective view which shows the structure of the modification 4 of the fall prevention apparatus of this invention. Sectional drawing which shows the structure of the modification 4 of the fall prevention apparatus of this invention

  Hereinafter, the fall prevention device of an embodiment of the invention is explained using a drawing. In the present embodiment, a case of a speaker fall prevention device used in a speaker system or the like is illustrated.

  First, the configuration of a fall prevention device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a fall prevention device of the present embodiment. FIG. 2 is an exploded perspective view for explaining the main part of the fall prevention device of the present embodiment, and FIG. 3 is a cutaway perspective view for explaining the main part of the fall prevention device of the present embodiment. It is.

  As shown in FIGS. 1 to 3, the fall prevention device 1 of the present embodiment is a device attached to the upper surface of a speaker 2 used in a speaker system or the like. The fall prevention device 1 includes a mounting bracket 4 that is a mounting member for supporting the speaker 2 in a suspended state from the ceiling 3, and a fixing bolt 5 that is a fixing member for fixing the mounting bracket 4 to the speaker 2. In the unlikely event that the fixing bolt 5 is detached from the speaker 2, a locking member 6 is provided for locking the mounting bracket 4 and the speaker 2 (see FIGS. 4 and 5).

  The mounting bracket 4 includes a ceiling-side bracket 7 attached to the ceiling 3 and a speaker-side bracket 8 attached to the speaker 2. The ceiling side metal fitting 7 is comprised by the circular base 9 fixed to the ceiling 3, and the rotation support part 10 attached to the center of the circular base 9 so that a rotation position can be adjusted. The circular base 9 is provided with bolt insertion holes (mounting elongated holes) 12 through which the four mounting bolts 11 are passed, and the ceiling-side metal fitting 7 is bolted to the ceiling 3 by these four mounting bolts 11. (See FIGS. 4 and 5). A support hook 14 to which the support bolt 13 is locked is provided at the lower portion of the rotation support portion 10, and an adjustment bolt 16 for adjusting the vertical direction of the speaker surface 15 is inserted into the upper portion of the support hook 14. A bolt insertion hole (round hole) 17 is provided (see FIGS. 4 and 5).

  The speaker side metal fitting 8 is composed of a pair of left and right L-shaped plates 20 composed of a vertical plate 18 and a horizontal plate 19, and a central plate 21 that connects the pair of left and right L-shaped plates 20 to each other. On the upper part of the vertical plate 18 of the L-shaped plate 20, there is a bolt insertion hole (adjustment elongated hole) 22 through which the adjustment bolt 16 (adjustment bolt 16 for adjusting the vertical direction of the speaker surface 15) is inserted. The above-described support bolt 13 (support bolt 13 to which the support hook 14 of the ceiling side metal fitting 7 is locked) is provided at the center of the vertical plate 18 of the L-shaped plate 20. In this case, the support bolt 13 is provided so as to be passed between the pair of left and right L-shaped plates 20. When the adjustment bolt 16 is loosened in a state where the ceiling-side metal fitting 7 and the speaker-side metal fitting 8 are combined, the adjustment bolt 16 becomes slidable in the adjustment long hole 22, and the support bolt 13 is set as the rotation center. The speaker side metal fitting 8 can be rotated with respect to the ceiling side metal fitting 7. Thereby, the direction of the vertical direction of the speaker surface 15 can be adjusted.

  Further, the horizontal plate 19 of the speaker side metal fitting 8 has a bolt insertion hole (fixing oblong hole) 23 for inserting the fixing bolt 5 (fixing bolt 5 for fixing the mounting metal fitting 4 to the speaker 2). Is provided. The fixing bolt 5 is passed through the fixing long hole 23 of the speaker side metal fitting 8 and fastened to the bolt fastening hole 34 on the upper surface of the speaker 2. Further, the center plate 21 of the speaker side metal fitting 8 protrudes downward. The locking member 6 (when the fixing bolt 5 is detached from the speaker 2 and the attachment metal 4 and the speaker 2 are provided below the center plate 21. A locking hole 24 is provided in which a locking member 6) is locked.

  The locking member 6 is provided on the upper portion of the speaker 2. In the present embodiment, the locking member 6 includes a base portion 25 attached to the upper portion of the speaker 2 and a hook portion 26 formed so as to protrude upward from the base portion 25. The base portion 25 is attached to the upper plate 27 of the speaker 2 from the inside, and the tip portion of the hook portion 26 is exposed from a hole portion 28 provided in the upper plate 27 of the speaker 2 (FIGS. 2 and 2). 3). The front end portion of the hook portion 26 is bent and is configured to be locked in a locking hole 24 provided in the speaker side metal fitting 8 of the attachment metal fitting 4.

  Here, an example in which the locking member 6 is provided in the speaker 2 and the locking hole 24 is provided in the mounting bracket 4 will be described, but the scope of the present invention is not limited to this, and the locking member Needless to say, 6 may be provided in the mounting bracket 4 and the locking hole 24 may be provided in the speaker 2.

  As shown in FIG. 2, the fall prevention device 1 may include a fall prevention wire 100 as a fall prevention member of the speaker 2. One end of the fall prevention wire 100 is fixed without a wire attachment screw hole (not shown) provided on the ceiling 3, and the other end of the fall prevention wire 100 is provided with a wire attachment screw hole provided on the speaker 2. 101 is fixed. When the fall prevention wire 100 is fixed to the ceiling 3 or the speaker 2, a wire mounting screw 102 is used.

  1 to 3 exemplify a case where the speaker 2 is suspended from the ceiling 3 in a state where the speaker 2 is in a vertical state (a state in which the long side of the speaker surface 15 is vertical and the short side of the speaker surface 15 is horizontal). However, the scope of the present invention is not limited to this, and the same applies even when the speaker 2 is in the horizontal state (the long side of the speaker surface 15 is horizontal and the short side of the speaker surface 15 is vertical). It can be implemented.

  Next, referring to FIG. 4 and FIG. 5, the speaker 2 is fixed with the fixing bolt 5 (the state where the speaker 2 is fixed in a state suspended from the ceiling 3) and the fixing bolt 5 is detached (the locking state). The state in which the mounting bracket 4 and the speaker 2 are locked by the member 6 will be described in detail.

  4 is a side sectional view showing a state in which the speaker 2 is fixed by the fixing bolt 5, and FIG. 5 is a side sectional view showing a state in which the fixing bolt 5 is removed. As shown in FIG. 4, in a state where the speaker 2 is fixed with the fixing bolt 5 (a state before the fixing bolt 5 is removed), the gravity center position X of the speaker 2 fixed in a state where it is suspended from the ceiling 3, The locking position Y where the mounting bracket 4 and the speaker 2 are locked by the locking member 6 when the fixing bolt 5 is removed is shifted from each other in the vertical direction (vertical direction in the figure). Then, as shown in FIG. 5, in a state where the fixing bolt 5 has been removed, the speaker 2 moves to a position where the gravity center position X of the speaker 2 is directly below the locking position Y (rotates around the locking position). Thus, the center of gravity position X and the locking position Y of the speaker 2 coincide with each other in the vertical direction.

  The state in which the speaker 2 is fixed by the fixing bolt 5 and the state in which the fixing bolt 5 is detached can also be described from the viewpoint of the direction in which the speaker surface 15 faces. As shown in FIG. 4, in a state where the speaker 2 is fixed with the fixing bolt 5 (a state before the fixing bolt 5 is removed), the speaker surface 15 faces obliquely downward (inclined lower left direction in FIG. 4). Since the speaker 2 is installed in a state of being hung from the ceiling 3 in a store or a karaoke box, the speaker surface 15 is installed so as to be inclined downward as shown in FIG. . Then, as shown in FIG. 5, in a state where the fixing bolt 5 has been removed, the speaker surface 15 is directed obliquely upward (obliquely upper left direction in FIG. 5).

  Next, the configuration of the hook portion 26 of the locking member 6 and the locked portion 29 to which the hook portion 26 is locked will be described in detail with reference to FIG. FIG. 6 is an explanatory diagram showing a state in which the hook portion 26 is deformed so as to be bent with respect to the base portion 25. As shown in FIG. 6A, the hook portion 26 includes a first vertical member 30 formed so as to extend upward from the base portion 25 (upward in FIG. 6), and a first vertical member. A lateral member 31 formed so as to extend in the lateral direction (left direction in FIG. 6) from the distal end portion of 30, and so as to extend in the downward direction (downward direction in FIG. 6) from the distal end portion of the lateral member 31. The second vertical member 32 is formed. It can be said that the second vertical member 32 is formed so as to be folded back from the distal end portion of the first vertical member 30 and extend downward.

  The hook portion 26 is configured to be locked to the locked portion 29 of the mounting bracket 4. In the present embodiment, the lower part of the locking hole 24 provided in the lower part of the center plate 21 of the speaker side metal fitting 8 of the mounting metal fitting 4 corresponds to the locked part 29 of the present invention, and FIG. ), The locked portion 29 is accommodated between the first vertical member 30 and the second vertical member 32 before the fixing bolt 5 is removed. In this case, the cross-sectional shape of the locked portion 29 is a rectangular shape, and the minimum value A (the length A of the short side of the rectangle) of the locked portion 29 is the same as that of the first vertical member 30 and the second length. The width B between the vertical members 32 is set to be smaller than the width B, and the maximum width B (length B of the rectangular diagonal line) of the locked portion 29 is the same as that of the first vertical member 30 and the second length. It is set larger than the width B between the vertical members 32. In addition, although the case where the cross-sectional shape of the locked part 29 is a rectangular shape was illustrated here, the scope of the present invention is not limited to this, and the cross-sectional shape of the locked part 29 is a regular circle. For example, it may be a regular polygonal shape or an oval shape (rounded rectangular shape).

  The locking member 6 is made of a ductile metal material (for example, a sheet metal), and the hook portion 26 is in a state where the fixing bolt 5 is detached from the speaker 2 (the hook portion 26 and the locked portion 29). When the external force such as an earthquake shake is further applied to the speaker 2, the base portion 25 can be plastically deformed so as to be bent by the external force. Has been.

  In this case, the deformation direction of the hook portion 26 is a direction (left direction in FIG. 6) corresponding to the direction in which the tip of the hook portion 26 is bent, and more specifically, from the first vertical member 30. This is the direction in which the second vertical member 32 is provided. In this case, as shown in FIG. 6A, the locked portion 29 is located between the hole portion 28 of the speaker 2 and the second vertical member 32 before the hook portion 26 is deformed. After passing through the space of the width D, the gap between the first vertical member 30 and the second vertical member 32 passes through the gap of the width E between the base portion 25 and the tip of the second vertical member 32. It is stored in a space of width A. As shown in FIG. 6C, in the state after the hook portion 26 is deformed, the width of the passage through which the locked portion 29 has passed (the hole portion 28 of the speaker 2 and the second vertical member 32). Width D ′ and width E ′) between the base portion 25 and the tip of the second vertical member 32 are narrowed. Therefore, the deformation direction of the hook portion 26 is a direction in which the width of the passage through which the locked portion 29 has passed is narrowed, and this deformation (a deformation that narrows the width of the passage through which the locked portion 29 can pass). ) Can prevent the hook portion 26 and the locked portion 29 from being unlocked. Therefore, it can be said that the deformation direction of the hook portion 26 is a direction in which the hook portion 26 and the locked portion 29 are not easily unlocked.

  In the present embodiment, the side opposite to the direction in which the tip of the hook portion 26 is bent, that is, the side opposite to the direction in which the second vertical member 32 is provided when viewed from the first vertical member 30 (FIG. 6). On the right side), a wall 33 is provided. When the hook portion 26 tries to deform in a direction opposite to the deformation direction (right direction in FIG. 6), the wall portion 33 interferes and the hook portion 26 deforms in the direction opposite to the deformation direction. Is prevented. Here, the example in which the inner wall of the hole portion 28 of the speaker 2 is used as the wall portion 33, that is, the wall portion 33 is provided in the hole portion 28 of the speaker 2, has been described. The wall portion 33 may be provided on the locking member 6.

  About the fall prevention apparatus 1 comprised as mentioned above, the operation | movement is demonstrated with reference to drawings.

  Here, first, with reference to FIG. 4 and FIG. 5, the operation when the fixing bolt 5 is detached from the speaker 2 due to damage or the like will be described. When the speaker 2 is installed on the ceiling 3, as shown in FIG. 4, the speaker side metal fitting 8 of the attachment metal fitting 4 is attached to the upper surface of the speaker 2, and the ceiling side metal fitting 7 of the attachment metal fitting 4 is attached to the ceiling 3. The side metal fitting 8 and the ceiling side metal fitting 7 are combined. When attaching the speaker side metal fitting 8 to the upper surface of the speaker 2, the lower part of the central plate 21 of the speaker side metal fitting 8 is inserted into the hole 28 of the upper plate 27 of the speaker 2, and the speaker side metal fitting 8 is attached to the locking member 6 (speaker). Slide toward the inside of 2). Then, the tip end portions (the horizontal member 31 and the second vertical member 32) of the hook portion 26 of the locking member 6 are inserted into the locking holes 24 in the lower portion of the center plate 21 of the speaker side metal fitting 8. At this time, the fixing long hole 23 and the bolt fastening hole 34 are aligned, and in this state, the fixing bolt 5 is passed through the fixing long hole 23 and fastened to the bolt fastening hole 34 on the upper surface of the speaker 2. In this state (state fixed with the fixing bolt 5), the locked portion 29 of the speaker side metal fitting 8 is not locked with the hook portion 26 of the locking member 6.

  And after combining the speaker side metal fitting 8 and the ceiling side metal fitting 7, the vertical direction of the speaker surface 15 is adjusted. In this case, the adjustment bolt 16 is loosened, the speaker side bracket 8 is rotated with respect to the ceiling side bracket 7 with the support bolt 13 as the center of rotation, and the vertical direction of the speaker surface 15 is adjusted and adjusted. Retighten the bolts 16. In this case, the speaker surface 15 is installed so as to be fixed obliquely downward. At this time, the gravity center position X of the speaker 2 fixed in a suspended state from the ceiling 3 and the locking position where the mounting bracket 4 and the speaker 2 are locked by the locking member 6 when the fixing bolt 5 is removed. Y is shifted from each other in the vertical direction (vertical direction in the figure).

  If regular maintenance is performed, it is possible to avoid the situation where the fixing bolt 5 is detached. However, if the maintenance bolt 5 is used for many years (for example, several decades) without performing any regular maintenance, the fixing bolt 5 May be loosened, or the fixing bolt 5 may be deteriorated over time and damaged. In the present embodiment, even if all the fixing bolts 5 are removed due to breakage or the like, the locked portion 29 of the speaker side metal fitting 8 and the hook portion 26 of the locking member 6 are locked as shown in FIG. By doing so, the mounting bracket 4 and the speaker 2 are locked, and the speaker 2 is prevented from falling. In this state, the speaker 2 moves to a position where the gravity center position X of the speaker 2 is directly below the locking position Y, so that the gravity center position X and the locking position Y of the speaker 2 coincide with each other in the vertical direction. Then, the speaker surface 15 faces obliquely upward (obliquely upper left direction in FIG. 5).

  In addition, this fall prevention device 1 has taken measures even when an external force is applied due to an earthquake shake or the like in a state where the bolt has been removed. That is, when an external force such as an earthquake shake is applied to the speaker 2 in a state where the fixing bolt 5 is detached from the speaker 2 (the hook portion 26 and the locked portion 29 are locked to each other), Due to the external force, the hook portion 26 is plastically deformed so as to be bent with respect to the base portion 25 as shown in FIG.

  Here, the deformation of the hook portion 26 will be described in detail with reference to FIG. Assuming that an external force due to an earthquake or the like is further applied in a state where the fixing member has been disengaged (a state where the hook portion 26 and the locked portion 29 are locked), and the article is shaken by the external force, FIG. Since the minimum value A of the width of the locked portion 29 is smaller than the width B between the first vertical member 30 and the second vertical member 32, the locked portion 29 is It rotates a little while being accommodated between the 26 first vertical members 30 and the second vertical members 32.

  Then, as shown in FIG. 6 (b), the attachment member is slightly inclined with respect to the hook portion 26 in accordance with the rotation of the locked portion 29 with respect to the hook portion 26. Since the maximum value C of the width of 29 is larger than the width B between the first vertical member 30 and the second vertical member 32, the locked portion 29 has an angle θ (B = C cos θ). ), It becomes caught between the first vertical member 30 and the second vertical member 32 and cannot be rotated any further.

  In this state, when the article is further shaken by an external force due to an earthquake or the like, the external force is amplified by a so-called “lever principle”, and the hook portion 26 is moved relative to the base portion 25 as shown in FIG. It acts on the hook portion 26 as a force for deforming so as to be bent, and the hook portion 26 is deformed so as to be bent with respect to the base portion 25. The direction of this deformation corresponds to the direction in which the tip of the hook portion 26 is bent (the left direction in FIG. 6), and this deformation makes it difficult for the hook portion 26 and the locked portion 29 to be unlocked. Become.

  According to such a fall prevention device 1 of the embodiment of the present invention, the locking member 6 that locks the mounting bracket 4 and the speaker 2 when the fixing bolt 5 is detached from the speaker 2 is provided. Thus, even if the fixing bolt 5 for fixing the speaker 2 in a state where it is suspended from the ceiling 3 is removed from the speaker 2 by any chance, the speaker 2 can be prevented from falling from the ceiling 3. .

  In other words, in the present embodiment, even if the fixing bolt 5 for fixing the speaker 2 in a state where it is suspended from the ceiling 3 is removed from the speaker 2 due to damage or the like, the mounting member is fixed by the locking member 6. 4 and the speaker 2 are locked, and the speaker 2 can be prevented from falling from the ceiling 3. Moreover, in this case, as shown in FIG. 4, the center of gravity position X of the speaker 2 fixed in a state of being suspended from the ceiling 3 by the fixing bolt 5, and the mounting bracket 4 and the speaker in a state in which the fixing bolt 5 is removed. 2 is shifted from each other in the vertical direction. When the fixing bolt 5 is removed, the speaker 2 moves to a position where the center of gravity of the speaker 2 is directly below the locking position (the locking position is changed). Rotate around the center). In this way, before and after the fixing bolt 5 is removed, the position and inclination of the speaker 2 suspended from the ceiling 3 change, and as a result, the appearance of the speaker 2 (how the speaker 2 looks) changes. . Therefore, the user can easily notice that the fixing bolt 5 has been removed based on a change in the appearance of the speaker 2 (how the speaker 2 looks).

  Further, in the present embodiment, even when the fixing bolt 5 is removed from the speaker 2 by any chance, the speaker 2 can be prevented from falling. When a heavy article such as the speaker 2 is suspended from the ceiling 3, the heavy article (speaker 2) is efficiently supported (the fixing strength by the fixing bolt 5 does not need to be increased so much). For this reason, it has been usual to fix in a state where the locking position Y between the mounting bracket 4 and the speaker 2 and the gravity center position X of the speaker 2 coincide with each other in the vertical direction. In other words, if the center of gravity position shifts, a moment is generated, so the bolt mounting strength must be increased to prevent the bolt from being removed even if the moment is received, but the center of gravity position must be adjusted. For example, there is no need to take moment into account, and the bolt mounting strength can be reduced accordingly.

  On the other hand, in the present embodiment, although the mounting strength of the fixing bolt 5 needs to be increased (as compared with the case where the center of gravity position X and the locking position Y are combined), the mounting bracket 4 and the speaker 2 And the center of gravity X position of the speaker 2 are shifted in the vertical direction. That is, it can be said that the configuration for taking a countermeasure when the fixing bolt 5 is removed is given priority over the configuration for making it difficult to remove the fixing bolt 5. By adopting such a configuration, when the fixing bolt 5 is removed, the speaker 2 moves to a position where the center of gravity of the speaker 2 is directly below the locking position (rotates around the locking position). Thus, before and after the fixing bolt 5 is removed, the position and inclination of the speaker 2 suspended from the ceiling 3 change, and as a result, the appearance of the speaker 2 (how the speaker 2 looks) Will change. In this case, in the state suspended from the ceiling 3 as shown in FIG. 4 (state where the fixing bolt 5 is not removed), the speaker surface 15 is directed obliquely downward, and the fixing bolt 5 is attached as shown in FIG. In the detached state, the speaker surface 15 faces obliquely upward. Therefore, the user can easily notice that the fixing bolt 5 has been removed based on such a change in the appearance of the speaker 2 (how the article is seen). In this case, since the direction of the speaker surface 15 changes, the way in which sound is transmitted from the speaker 2 also changes. Therefore, the user can also recognize that the fixing bolt 5 has been removed based on a change in sound from the speaker 2 (how to hear the sound).

  Furthermore, in the present embodiment, measures are taken even when an external force is applied due to an earthquake or the like in a state where the bolt has been removed. That is, when an external force due to an earthquake or the like is further applied in a state where the fixing bolt 5 has been removed, the speaker 2 is shaken by the external force, and the hook portion 26 moves relative to the base portion 25 as shown in FIG. It will be deformed to be bent. In this case, the direction of the deformation corresponds to the direction in which the tip of the hook portion 26 is bent, and this deformation prevents the hook portion 26 and the locked portion 29 from being unlocked. it can. In this way, measures are taken to prevent the hook portion 26 and the locked portion 29 from being unlocked even when an external force is applied due to an earthquake or the like in a state where the fixing bolt 5 has been removed. Therefore, higher safety can be obtained.

  In the present embodiment, since the minimum value A of the width of the locked portion 29 is smaller than the width B between the first vertical member 30 and the second vertical member 32, the locked portion 29 is The hook portion 26 is rotatable in a state of being accommodated between the first vertical member 30 and the second vertical member 32. Therefore, when the fixing bolt 5 is detached (the hook portion 26 and the locked portion 29 are locked) and an external force is applied due to an earthquake or the like, and the speaker 2 is shaken by the external force, the locked bolt 5 is locked. The part 29 rotates a little while being accommodated between the first vertical member 30 and the second vertical member 32 of the hook part 26. At this time, the mounting bracket 4 is slightly inclined with respect to the hook portion 26 in accordance with the rotation of the locked portion 29 with respect to the hook portion 26. In this case, since the maximum value C of the width of the locked portion 29 is larger than the width B between the first vertical member 30 and the second vertical member 32, the locked portion 29 is at an angle. When rotated by θ (an angle θ at which B = C cos θ), it is caught between the first vertical member 30 and the second vertical member 32 and cannot be rotated any further. In this state, when the speaker 2 is further shaken by an external force due to an earthquake or the like, the external force is amplified by a so-called “lever principle”, and the hook portion 26 is deformed so as to be bent with respect to the base portion 25. It acts on the part 26. Accordingly, when an external force due to an earthquake or the like is further applied in a state where the fixing bolt 5 has been removed, the external force is amplified using the “lever principle”, and the hook portion 26 is connected to the base portion 25. It can be deformed to be bent. As described above, the direction of the deformation corresponds to the direction in which the tip of the hook portion 26 is bent, and the hook portion 26 and the locked portion 29 are unlocked by this deformation. Can be prevented.

  In the present embodiment, since the locking member 6 is manufactured using a ductile metal material (for example, a sheet metal), the hook portion 26 is deformed so as to be bent with respect to the base portion 25. Can be plastically deformed. In plastic deformation, the deformed state remains even after the external force is removed. Therefore, even after the external force due to an earthquake or the like is lost, the hook portion 26 remains in a deformed state, and the hook portion 26 and the locked portion 29 can be prevented from being unlocked.

  In the present embodiment, the hook portion 26 is deformed in a direction opposite to the direction in which the tip portion of the hook portion 26 is bent (the direction in which the hook portion 26 and the locked portion 29 are easily released). Then, the wall portion 33 prevents the deformation. Therefore, it is possible to prevent the hook portion 26 and the locked portion 29 from being released due to the deformation in the opposite direction.

  In the present embodiment, it is possible to prevent the speaker 2 from falling by the fall prevention wire 100. In this case, a triple fall prevention structure including the fixing bolt 5, the locking member 6, and the fall prevention wire 100 is provided, and higher safety can be obtained.

(Modification)
Hereinafter, modifications of the fall prevention device of the present invention will be described. Here, the modification will be described with a focus on differences from the above embodiment. Unless otherwise specified, the configuration and operation of the modification are the same as those in the above embodiment.

  Hereinafter, four modified examples (modified examples 1 to 4) will be described with reference to the drawings (FIGS. 7 to 12). In the above embodiment, the support hook 14 is provided on the ceiling side metal fitting 7 and the support bolt 13 and the adjustment long hole 22 are provided on the speaker side metal fitting 8, whereas in the following modification, the speaker side The metal fittings 40, 60, 70, 80 are provided with support hooks 44, 64, 74, 84, and the ceiling-side metal fitting is provided with a support bolt and an adjustment long hole. In the explanatory diagrams of the modified examples (FIGS. 7 to 12), only the speaker-side metal fitting of the attachment metal fitting 4 is shown, and the illustration of the ceiling-side metal fitting is omitted.

  FIG. 7 is a perspective view showing the configuration of Modification 1 of the fall prevention device of the present invention. As shown in FIG. 7, in the first modification, the speaker side metal fitting 40 is configured by a pair of left and right L-shaped plates 43 including a vertical plate 41 and a horizontal plate 42. On the upper part of the vertical plate 41 of the L-shaped plate 43, a support hook 44 that is locked to a support bolt (not shown) of the ceiling side metal fitting is provided. The horizontal plate 42 of the L-shaped plate 43 is provided with bolt insertion holes (fixing long holes) 45 for inserting the two fixing bolts 5, respectively. A locking hole 47 for locking the locking member 46 protruding from the upper surface is provided. On the other hand, the locking member 46 on the upper surface of the speaker 2 is constituted by a large-diameter head portion 48 and a small-diameter shaft portion 49, and the locking hole 47 of the horizontal plate 42 of the L-shaped plate 43 is formed by a locking member. The insertion hole 50 has a larger diameter than the head 48 of the 46, and the locking long hole 51 has a smaller diameter than the head 48 of the locking member 46 and a larger diameter than the shaft 49.

  When attaching the speaker side metal fitting 40 to the upper surface of the speaker 2, the head 48 of the locking member 46 is inserted into the insertion hole portion 50 of the locking hole 47 of the horizontal plate 42, and then the speaker side metal fitting 40 is slid. The head 48 of the stop member 46 is locked to the locking slot 51 of the horizontal plate 42. At this time, the fixing long hole 45 and the bolt fastening hole 52 are aligned, and in this state, the fixing bolt 5 is passed through the fixing long hole 45 and fastened to the bolt fastening hole 52 on the upper surface of the speaker 2. Therefore, in the state of being fixed by the fixing bolt 5, the locking elongated hole 51 of the speaker side metal fitting 40 and the head 48 of the locking member 46 are not locked. When all the fixing bolts 5 have been removed due to breakage or the like, the locking elongated hole 51 of the speaker-side metal fitting 40 and the head 48 of the locking member 46 are locked, so that the mounting metal 4 The speaker 2 is locked and the speaker 2 is prevented from falling.

  Furthermore, also in this modified example 1, as in the above embodiment, the center of gravity position X of the speaker 2 fixed in a state of being suspended from the ceiling 3 by the fixing bolt 5 and the mounting bracket in a state in which the fixing bolt 5 is removed. 4 and the locking position Y of the speaker 2 are shifted from each other in the vertical direction, so that when the fixing bolt 5 is removed, the speaker 2 moves to a position where the position of the center of gravity of the speaker 2 is directly below the locking position. Rotate around the stop position). In this way, before and after the fixing bolt 5 is removed, the position and inclination of the speaker 2 suspended from the ceiling 3 change, and as a result, the appearance of the speaker 2 (how the speaker 2 looks) changes. . Therefore, the user can easily notice that the fixing bolt 5 has been removed based on a change in the appearance of the speaker 2 (how the speaker 2 looks).

  FIG. 8 is a perspective view showing a configuration of Modification 2 of the fall prevention device of the present invention. As shown in FIG. 8, also in the second modification, the speaker side metal fitting 60 is composed of a pair of left and right L-shaped plates 63 composed of a vertical plate 61 and a horizontal plate 62, and the vertical plate of the L-shaped plate 63. A support hook 64 that is locked to a support bolt (not shown) of the ceiling side metal fitting is provided on the upper portion of 61. The horizontal plate 62 of the L-shaped plate 63 is provided with bolt fastening holes 65 to which the two fixing bolts 5 are fastened. On the other hand, a hole 66 is formed in the upper plate 27 of the speaker 2, and a locking member 67 is attached from the inside of the speaker 2 so that the tip of the hole 66 is exposed. A locking portion 68 for locking the horizontal plate 62 of the L-shaped plate 63 is provided at the distal end portion of the locking member 67, and a bolt insertion hole through which the fixing bolt 5 is inserted is provided in the locking portion 68. 69 is provided.

  When the speaker side metal fitting 60 is attached to the upper part of the speaker 2, the horizontal plate 62 of the L-shaped plate 63 is locked to the locking portion 68 of the locking member 67 (attached in advance inside the speaker 2). At this time, the bolt insertion hole 69 and the bolt fastening hole 65 are aligned, and in this state, the fixing bolt 5 is passed through the bolt insertion hole 69 and fastened to the bolt fastening hole 65 on the upper surface of the speaker 2. As described above, in the second modified example, the horizontal plate 62 of the speaker side metal fitting 60 and the locking portion 68 of the locking member 67 are locked even when fixed by the fixing bolt 5. Even when all the fixing bolts 5 are removed due to breakage or the like, the mounting plate 4 and the speaker 2 are locked by the horizontal plate 62 of the speaker side metal fitting 60 and the locking portion 68 of the locking member 67 being locked. And the speaker 2 is prevented from falling.

  Further, also in the second modification, the center of gravity position X of the speaker 2 fixed in a state of being suspended from the ceiling 3 by the fixing bolt 5 and the mounting bracket in a state in which the fixing bolt 5 is removed, as in the above embodiment. 4 and the locking position Y of the speaker 2 are shifted from each other in the vertical direction, so that when the fixing bolt 5 is removed, the speaker 2 moves to a position where the position of the center of gravity of the speaker 2 is directly below the locking position. Rotate around the stop position). In this way, before and after the fixing bolt 5 is removed, the position and inclination of the speaker 2 suspended from the ceiling 3 change, and as a result, the appearance of the speaker 2 (how the speaker 2 looks) changes. . Therefore, the user can easily notice that the fixing bolt 5 has been removed based on a change in the appearance of the speaker 2 (how the speaker 2 looks).

  FIG. 9 is a perspective view showing a configuration of a third modification of the fall prevention device of the present invention, and FIG. 10 is a cross-sectional view for explaining a configuration of the third modification. As shown in FIGS. 9 and 10, in the third modification, the speaker side metal fitting 70 is composed of a pair of left and right L-shaped plates 73 composed of a vertical plate 71 and a horizontal plate 72, and the L-shaped plate 73. A support hook 74 that is locked to a support bolt (not shown) of the ceiling side metal fitting is provided on the upper portion of the vertical plate 71. The horizontal plate 72 of the L-shaped plate 73 is provided with a height adjusting bolt 75. As shown in FIG. 10, when the height adjusting bolt 75 is rotated, the L-shaped plate 73 slides in the vertical direction. It is configured so that the height can be adjusted. Further, a hole 76 is formed in the upper plate 27 of the speaker 2, and the L-shaped plate 73 is attached from the inside of the speaker 2 so that the vertical plate 71 of the L-shaped plate 73 is exposed from the hole 76. Yes. A holding member 77 for holding the L-shaped plate 73 is attached to the inside of the upper plate 27 of the speaker 2, and the holding member 77 is fixed to the upper plate 27 of the speaker 2 with fixing bolts 5.

  When the speaker side metal fitting 70 is attached to the upper plate 27 of the speaker 2, the L-shaped plate 73 is attached from the inside of the speaker 2 so that the vertical plate 71 of the L-shaped plate 73 is exposed from the hole 76. And after attaching the holding member 77 from the inner side of the speaker 2 so as to hold the L-shaped plate 73, the height adjusting bolt 75 is rotated to adjust the height of the L-shaped plate 73. In the third modification, when the fixing bolt 5 and the height adjusting bolt 75 are all detached due to damage or the like, the horizontal plate 72 of the speaker side metal fitting 70 is locked to the upper plate 27 of the speaker 2, thereby 4 and the speaker 2 are locked, and the speaker 2 is prevented from falling.

  Further, also in the third modification, as in the above-described embodiment, the gravity center position X of the speaker 2 fixed in a state suspended from the ceiling 3 by the fixing bolt 5 (and the height adjusting bolt 75), and the fixing bolt 5 Since the locking position Y between the mounting bracket 4 and the speaker 2 in the state in which the (and the height adjusting bolt 75) is disengaged from each other in the vertical direction, the fixing bolt 5 (and the height adjusting bolt 75) is When the speaker 2 comes off, the speaker 2 moves (rotates about the locking position) to a position where the center of gravity of the speaker 2 is directly below the locking position. In this way, before and after the fixing bolt 5 (and the height adjusting bolt 75) is removed, the position and inclination of the speaker 2 suspended from the ceiling 3 change, and as a result, the appearance of the speaker 2 (speaker) 2) changes. Therefore, the user can easily notice that the fixing bolt 5 (and the height adjusting bolt 75) has been detached based on the change in the appearance of the speaker 2 (how the speaker 2 is seen).

  FIG. 11 is a perspective view showing the configuration of Modification 4 of the fall prevention device of the present invention, and FIG. 12 is a cross-sectional view for explaining the configuration of Modification 4. As shown in FIGS. 11 and 12, in Modification 4, the speaker side metal fitting 80 includes a pair of left and right vertical plates 81, a central plate 82 that connects the pair of left and right vertical plates 81, and a pair of left and right vertical plates 81. It is comprised with the horizontal plate 83 provided in both sides. A support hook 84 that is locked to a support bolt (not shown) of the ceiling-side metal fitting is provided on the upper portion of the vertical plate 81, and an engagement provided on the inner side of the speaker 2 is provided on the lower portion of the vertical plate 81. A locking hook 85 that is locked to the locking member 87 is provided. Further, the horizontal plate 83 is provided with bolt insertion holes (fixing long holes) 86 for inserting the fixing bolts 5. On the other hand, a locking member 87 is attached to the upper plate 27 of the speaker 2 from the inside. The locking member 87 is composed of a pair of left and right L-shaped members 88 and a locking bar 89 that is passed between the pair of left and right L-shaped members 88. The stop hook 85 is locked. In this case, a hole 90 is formed in the upper plate 27 of the speaker 2, and the lower portion of the vertical plate 81 is inserted from the hole 90, and the locking hook 85 is locked to the locking rod 89.

  When attaching the speaker side metal fitting 80 to the upper surface of the speaker 2, the lower part of the vertical plate 81 is inserted from the hole 90 of the upper plate 27 of the speaker 2, and the locking member 87 (attached in advance inside the speaker 2). The engagement hook 85 is engaged with the engagement rod 89. Then, the fixing bolt 5 is passed through the fixing elongated hole 86 of the horizontal plate 83 and fastened to the bolt fastening hole 91 on the upper surface of the speaker 2. Therefore, in the fourth modification example, the locking hook 85 of the speaker side metal fitting 80 and the locking rod 89 of the locking member 87 are locked even in the state of being fixed by the fixing bolt 5. Even when all the fixing bolts 5 are removed due to damage or the like, the mounting hook 4 and the speaker are locked by the locking hook 85 of the speaker side metal fitting 80 and the locking bar 89 of the locking member 87 being locked. 2 and the speaker 2 is prevented from falling.

  Further, also in this modified example 4, as in the above embodiment, the center of gravity position X of the speaker 2 fixed in a state of being suspended from the ceiling 3 by the fixing bolt 5 and the mounting bracket in a state in which the fixing bolt 5 is removed. 4 and the locking position Y of the speaker 2 are shifted from each other in the vertical direction, so that when the fixing bolt 5 is removed, the speaker 2 moves to a position where the position of the center of gravity of the speaker 2 is directly below the locking position. Rotate around the stop position). In this way, before and after the fixing bolt 5 is removed, the position and inclination of the speaker 2 suspended from the ceiling 3 change, and as a result, the appearance of the speaker 2 (how the speaker 2 looks) changes. . Therefore, the user can easily notice that the fixing bolt 5 has been removed based on a change in the appearance of the speaker 2 (how the speaker 2 looks).

  The embodiments of the present invention have been described above by way of example, but the scope of the present invention is not limited to these embodiments, and can be changed or modified according to the purpose within the scope of the claims. is there.

  As described above, the fall prevention device according to the present invention prevents the article from falling even if the fixing member for fixing the article in a state where it is suspended from the ceiling is removed from the article. And is useful as a speaker fall prevention device or the like.

DESCRIPTION OF SYMBOLS 1 Fall prevention apparatus 2 Speaker 3 Ceiling 4 Mounting bracket 5 Fixing bolt 6 Locking member 7 Ceiling side bracket 8 Speaker side bracket 15 Speaker surface 25 Base part 26 Hook part 29 Locked part 30 First vertical member 31 Horizontal member 32 Second vertical member 33 Wall 40 Speaker side metal fitting (Modification 1)
46 Locking member (Modification 1)
60 Speaker side bracket (Modification 2)
67 Locking member (Modification 2)
70 Speaker side bracket (Modification 3)
80 Speaker side bracket (Modification 4)
87 Locking member (Modification 4)
100 Fall prevention wire

Claims (6)

An attachment member attached to the ceiling and supporting the article in a suspended state from the ceiling;
A fixing member that is attached to the article via the attachment member and fixes the article in a state of being suspended from the ceiling;
A locking member that is provided on the mounting member or the article, and that locks the mounting member and the article together in a state where the fixing member is detached from the article;
With
The position of the center of gravity of the article fixed in a state suspended from the ceiling by the fixing member, and the attachment member and the article are locked to each other by the locking member in a state where the fixing member is detached from the article. And the locked position to be shifted from each other in the vertical direction ,
The locking member includes a base portion attached to an upper portion of the article, and a locked portion provided on the attachment member, the tip portion being bent so as to protrude upward from the base portion. A hook portion for locking,
The hook portion is deformed to be bent with respect to the base portion by an external force applied to the article in a state where the fixing member is detached from the article and the hook portion and the locked portion are locked to each other. Is possible and
The direction of the deformation is a direction corresponding to the direction in which the tip of the hook portion is bent, and it is possible to prevent the hook portion and the locked portion from being unlocked by the deformation. anti-fall device, characterized in that there.   The article is a speaker, and in a state where the fixing member is mounted and suspended from the ceiling, the speaker surface of the speaker faces obliquely downward, and the fixing member is detached and locked to the mounting member. The fall prevention device according to claim 1, wherein the speaker surface of the speaker faces obliquely upward in a state. 3. The wall according to claim 1 , wherein the locking member or the article is provided with a wall portion that prevents the hook portion from being deformed in a direction opposite to the deformation direction . Fall prevention device. An attachment member attached to the ceiling so as to suspend the article from the ceiling;
A fixing member attached to the article so as to fix the article and the attachment member;
A locking member that locks the attachment member and the article together in a state where the fixing member is detached from the article;
With
The locking member includes a base portion attached to an upper portion of the article, and a locked portion provided on the attachment member, the tip portion being bent so as to protrude upward from the base portion. A hook portion for locking,
The hook portion is deformed to be bent with respect to the base portion by an external force applied to the article in a state where the fixing member is detached from the article and the hook portion and the locked portion are locked to each other. And
The direction of the deformation is a direction corresponding to a direction in which the tip of the hook portion is bent so as to prevent the hook portion and the locked portion from being unlocked. Prevention device. The position of the center of gravity of the article fixed in a state suspended from the ceiling by the fixing member, and the attachment member and the article are locked to each other by the locking member in a state where the fixing member is detached from the article. The fall prevention device according to claim 4, wherein the locked positions are shifted from each other in the vertical direction . The said locking member, fall prevention according to claim 4 or claim 5, wherein the hook portion is provided with a wall to prevent deformation in the direction opposite to the direction of the deformation apparatus.