JP7601969B2 - Fire prevention grille - Google Patents

Description

The present invention relates to a fire grille that is installed on the outdoor side of a window device.

In apartment complexes and other collective housing, window devices have traditionally been installed facing common corridors for the purpose of indoor ventilation and lighting. Furthermore, grilles are installed on the outdoor side of window devices installed facing common corridors to ensure crime prevention and privacy. Various types of grilles have been known, but the use of louver grilles with openable louvers, as described in JP 2009-46868 A and other publications, has been increasing in recent years because they allow for freely adjustable ventilation and light blocking properties. Meanwhile, there has been a demand in recent years for grilles with improved fire resistance to prevent the spread of fire.

JP 2009-46868 A JP 2001-173332 A JP 2012-41731 A

In order to improve fire protection while ensuring crime prevention and privacy, it is effective to design the structure so that the louver grille installed on the outdoor side of the window device does not block the heat dissipation from the window device when a fire breaks out indoors with the louvers fully closed.

The present invention has been made to solve the above problems, and aims to provide a fireproof grille that does not block heat dissipation from the window device even when a fire breaks out indoors with the louvers fully closed.

A fireproof grille according to one aspect of the present invention is installed on the outdoor side of a window device and comprises a mounting bracket, a grille body, a locking mechanism, a release mechanism , and an angle restriction means .
The mounting bracket is attached to the exterior side of a window frame that constitutes the window device.
The grille body is configured in a rectangular frame shape and has a frame body whose lower end is rotatably supported (pivoted) relative to the mounting bracket, and a plurality of louvers supported on the inside of the frame body so that they can be opened and closed.
The locking mechanism holds (locks) the grille body in a closed position.
The release means has a temperature sensor and releases the lock mechanism.
The angle restriction means prevents the opening angle of the grille body from becoming any larger when an opening is formed between the top of the grille body and the top of the window device.
In one aspect of the fireproof grille of the present invention, when the temperature sensor detects that a predetermined temperature has been reached, the locking mechanism is released and the grille body is swung open.

In one aspect of the present invention, the temperature sensor can be a thermal fuse that melts when the predetermined temperature is reached.

In one aspect of the present invention, the locking mechanism can include a bracket-side engaging portion provided on the mounting bracket and a grille-side engaging portion provided on the grille body.

In one aspect of the present invention, the release mechanism further includes a release arm having the grille side engagement portion at its tip, and a pressing portion that presses the release arm toward the tip, and when the temperature sensor detects that the predetermined temperature has been reached, the release arm is permitted to move toward the tip.

In one aspect of the present invention , the release mechanism can be housed inside the upper frame that constitutes the upper edge of the frame body.
In addition, the mounting bracket can have a first mounting bracket attached to the vertical frame and a second mounting bracket having an upper end supported so as to be rotatable relative to the first mounting bracket, and the lower end of the frame body can be supported so as to be rotatable relative to the lower end of the second mounting bracket.

In one aspect of the present invention, the opening angle of the grating body can be set to 10 degrees to 40 degrees .
In one aspect of the present invention, the angle restriction means can be configured separately from the surface grating body.
In one aspect of the present invention, the angle restriction means can be provided between an upper portion of the grille body and an upper portion of the mounting bracket.
In one aspect of the present invention, the angle restriction means can be formed of a wire.

In one aspect of the present invention, the grille body may further include a biasing member that biases the grille body toward the outdoor side.
The biasing member may be, for example, an elastic member such as a spring or rubber.

The fireproof grille of the present invention can prevent heat dissipation from the window device from being blocked even if a fire breaks out indoors with the louvers fully closed.

FIG. 1 is a view of a fire grate according to a first embodiment of the present invention as viewed from the outdoor side. FIG. 2 is a vertical cross-sectional view corresponding to the cross section AA of FIG. FIG. 3 is a diagram showing the same structure as FIG. 2 with the screens omitted, where (A) shows the louvers in a fully closed state, and (B) shows the louvers in a fully open state. FIG. 4 is a partially omitted view corresponding to the cross section taken along the line BB in FIG. FIG. 5 is an enlarged view of the upper part of FIG. FIG. 6 is a diagram showing the state in which the lattice body is swung open during maintenance work, with the screens omitted from FIG. FIG. 7 shows the upper hinge, (A) being a plan view and (B) being a side view. FIG. 8 is an enlarged view of the lower part of FIG. FIG. 9 is a diagram showing the state in which the lattice body is swung open in the event of a fire, with the screens omitted from FIG. FIG. 10 shows the lower hinge, (A) being a plan view and (B) being a side view. FIG. 11 is a cross-sectional view taken along line BB of FIG. FIG. 12 is a cross-sectional view taken along the line CC of FIG. 2, where (A) shows the locked state and (B) shows the unlocked state. 13A and 13B are partially omitted views of FIG. 12 as viewed from above, where (A) shows the locked state and (B) shows the unlocked state. FIG. 14 is a partially enlarged view of FIG. FIG. 15 shows three modified examples of the present invention.

[First Example of the Embodiment]
A first example of the embodiment will be described with reference to FIGS. 1 to 14. FIG.

The fire grille 1 is installed on the outdoor side of a window device 2 that is attached facing a common corridor in an apartment building, for example, and has the function of automatically swinging open in the event of a fire inside the room, so as not to impede the release of heat from the window device 2. Below, we will briefly explain the structure of the window device 2, and then explain the structure of the fire grille 1 in detail.

Window Device
As shown in Figure 2, the window device 2 comprises a rectangular window frame 3, and an inner screen 4 and an outer screen 5 which are fitted in a sliding manner inside the window frame 3 so as to be movable in the in-plane direction (horizontal direction).
In addition, the outer side in the in-plane direction refers to the outer side in the width direction (left and right direction) of the window frame 3, and the inner side in the in-plane direction refers to the center side in the width direction of the window frame 3.

The window frame 3 comprises an upper frame 6 arranged in the in-plane direction of the opening in the body and constituting the upper side, a lower frame 7 arranged in the same in-plane direction and constituting the lower side, and a pair of vertical frames 8 arranged vertically and constituting the left and right vertical sides. The in-plane ends of the upper frame 6 and the lower frame 7 are connected to the top and bottom ends of the pair of vertical frames 8 using tapping screws or the like to form the window frame 3 into a rectangular frame (a square frame with right-angled corners). Each of the upper frame 6, lower frame 7 and vertical frames 8 is made of an aluminum alloy.

The inner and outer screens 4 and 5 are made up of rectangular screen frames 9a and 9b, and rectangular glass panels 10a and 10b fitted inside the screen frames 9a and 9b. Each of the frames (upper frame, lower frame, door end frame, and door frame) that make up the screen frames 9a and 9b are made of an aluminum alloy.

The inner screen 4 is set into the indoor side of the window frame 3 so that it can move in the in-plane direction. For this reason, the upper edge of the screen frame 9a of the inner screen 4 is engaged with an upper guide rail 11a provided on the indoor side of the upper frame 6, and the roller 12a provided on the lower edge of the screen frame 9a of the inner screen 4 is engaged with a lower guide rail 13a provided on the indoor side of the lower frame 7.

The outer screen 5 is set into the outdoor portion of the window frame 3 so that it can move in the in-plane direction. For this reason, the upper edge of the screen frame 9b of the outer screen 5 is engaged with the upper guide rail 11b provided on the outdoor portion of the upper frame 6, and the roller 12b provided on the lower edge of the screen frame 9b of the outer screen 5 is engaged with the lower guide rail 13b provided on the outdoor portion of the lower frame 7.

The window device 2 in this example further includes a screen door screen 14. The screen door screen 14 is set into the window frame 3 in a portion facing the outside (outdoor end) further than the portion into which the outer screen screen 5 is set, allowing it to move in the in-plane direction.

In this example, a sliding window device 2 is used as the window device, but when implementing the present invention, the structure of the window device is not limited to the sliding type, and other structures such as a fixed window, an inward-opening window, or an inward-tilting window can also be used.

<Overall structure of fireproof grille>
The fire grille 1 is installed on the outdoor side of a window device 2 to ensure crime prevention and privacy, and broadly comprises a grille body 15, a pair of mounting brackets 16, a locking mechanism 17, and a release mechanism 18.

The grille body 15 is attached to the outdoor side of the vertical frame 8 that constitutes the window frame 3 of the window device 2 using a pair of mounting brackets 16 so that it can be opened and closed. Under normal circumstances, it is held in a closed position (positioned parallel to the window device 2 and completely covering the window device 2 from the outdoor side) by a locking mechanism 17, but in the event of a fire, the locking mechanism 17 is released by a release mechanism 18 and the grille body 15 is swung open. It is also possible to manually open the grille body 15 when performing maintenance on the window device 2. Below, each component that constitutes the fire grille 1 of this example will be described in detail.

{Lattice panel body}
The grille body 15 comprises a frame body 19 formed in a rectangular frame shape, and a plurality of louvers 20 supported inside the frame body 19 so as to be openable and closable.

The frame body 19 comprises an upper frame 21 that forms the upper side, a lower frame 22 that forms the lower side, and a pair of vertical frames 23a, 23b that respectively form the left and right vertical sides. The frame body 19 is configured into a rectangular frame shape by connecting both in-plane ends of the upper frame 21 and the lower frame 22 to both vertical ends of the pair of vertical frames 23a, 23b using tapping screws or the like. Each of the upper frame 21, the lower frame 22, and the vertical frames 23a, 23b is made of an aluminum alloy and has a roughly rectangular cross-sectional shape.

The louvers 20 are strip-shaped members having a substantially U-shaped cross section, and are arranged vertically with their longitudinal direction facing the in-plane direction. The multiple louvers 20 arranged vertically are parallel to each other. Both ends of the louvers 20 in the in-plane direction are rotatably supported (pivoted) to a pair of vertical frames 23a, 23b using support pins 24. In order to open and close the multiple louvers 20 in a synchronized manner, the support pins 24 supporting one end of the louvers 20 in the in-plane direction are connected to each other by a crank arm and a linking rod (not shown). This allows the multiple louvers 20 to be opened and closed in a synchronized manner as shown in Figures 3A and 3B by operating the operating lever 25 provided on the louvers 20 arranged in the vertical middle. The blade angle of the louvers 20 can be adjusted between 0 degrees (Figure 3A) which is a fully closed state and 90 degrees (Figure 3B) which is a fully open state.

Mounting bracket
The mounting brackets 16 are provided in pairs (two) and are used to attach the grille body 15 to the left and right vertical frames 8 that constitute the window frame 3 of the window device 2. The pair of mounting brackets 16 have symmetrical shapes and are disposed parallel to each other and spaced apart in the in-plane direction.

In this example, in order to enable the grille body 15 to be opened in the event of a fire and during maintenance work on the window device 2 (particularly the screen door 14), each of the pair of mounting brackets 16 is composed of two members, a first mounting bracket 26 and a second mounting bracket 27. Note that when implementing this invention, if the grille body is to be made openable only in the event of a fire, the mounting bracket 16 can be composed of a single member (only the first mounting bracket 26).

As shown in FIG. 4, the first mounting bracket 26 is a plate-like member having a substantially L-shaped cross section, and has a total length (vertical dimension) substantially the same as that of the vertical frame 8. As a result, the first mounting bracket 26 covers the space between the outdoor side of the vertical frame 8 and the indoor side of the left and right vertical frames 23a, 23b that constitute the grille main body 15, improving visibility from the outdoor side. The first mounting bracket 26 has a protruding plate portion 29 having a locking groove 28 at its indoor end, and a mounting plate portion 30 that is bent at a substantially right angle inward in the in-plane direction from the outdoor end of the protruding plate portion 29. The locking groove 28 is provided over the entire length of the first mounting bracket 26, and is open on the outside in the in-plane direction. Such a first mounting bracket 26 is attached to the outdoor side of the vertical frame 8 by pressing a fin-shaped locking piece 31 provided on the outdoor end of the vertical frame 8 into the inside of the locking groove 28 and clamping the locking piece 31 from both indoor and outdoor sides with the inner surface of the locking groove 28. Note that the first mounting bracket does not have to have approximately the same overall length as the vertical frame 8, and multiple piece-shaped first mounting brackets with small vertical dimensions, such as those described in JP 2001-173332 A, may be used.

The second mounting bracket 27 is a plate-like member having a substantially L-shaped cross-section, and has substantially the same overall length (vertical dimension) as the first mounting bracket 26. The second mounting bracket 27 is disposed on the outdoor side of the mounting plate portion 30 constituting the first mounting bracket 26, and has a base portion 32 disposed substantially parallel to the mounting plate portion 30, and a guide plate portion 33 bent at a substantially right angle from the outer end of the base portion 32 toward the outdoor side. The guide plate portion 33 is disposed on the outer side of the left and right vertical frames 23a, 23b in the in-plane direction when the grille body 15 is held in the closed position.

In this example, the upper end of each of the second mounting brackets 27 is supported rotatably relative to the upper end of each of the first mounting brackets 26. Specifically, as shown in FIG. 5, the upper end of the mounting plate portion 30 constituting the first mounting bracket 26 and the upper end of the base portion 32 constituting the second mounting bracket 27 are connected to each other using an upper hinge 34. As a result, as shown in FIG. 6, during maintenance work on the window device 2, the grille body 15 can be swung open around a pivot axis located at the top of the grille body 15, like a so-called protruding window. At this time, the upper end of the grille body 15 becomes the pivot end, and the lower end becomes the free end. When the grille body 15 is swung open in this way, the second mounting bracket 27 operates integrally with the grille body 15.

As shown in FIG. 7, the upper hinge 34 is composed of a pair of mounting plates 35a, 35b and a pin 36 which is a pivot shaft. Of the pair of mounting plates 35a, 35b, the one mounting plate 35a fixed to the first mounting bracket 26 has a pair of screw holes 37 and a pair of support tubes 38 at one longitudinal end (upper end in mounted state) for supporting both ends of the pin 36. In contrast, of the pair of mounting plates 35a, 35b, the other mounting plate 35b fixed to the second mounting bracket 27 has a pair of pilot holes 39 and a hook portion 40 bent into an approximately U-shape at one longitudinal end (upper end in mounted state). The upper hinge 34 is assembled by arranging the hook portion 40 provided on the other mounting plate 35b between the pair of support tubes 38 and engaging it with the axial middle portion of the pin 36. Both ends of the pin 36 are crimped and deformed to prevent the pin 36 from falling off. In this example, the hook portion 40 of the other mounting plate 35b, which has been pre-fixed to the second mounting bracket 27 (grid body 15), is engaged with the pin 36 supported by one mounting plate 35a, which has been pre-fixed to the first mounting bracket 26. This forms the upper hinge 34, which connects the upper end of the mounting plate portion 30 of the first mounting bracket 26 and the upper end of the base plate portion 32 of the second mounting bracket 27 so that they can rotate around the pin 36.

As shown in (A) and (B) of FIG. 3, except when maintenance is being performed, the first mounting bracket 26 and the second mounting bracket 27 are fixed with a fixing screw 58. Therefore, a maintenance worker can only swing open the grille body 15 (and the second mounting bracket 27) by removing the fixing screw 58. This allows the replacement of the screen door 14 attached to the window frame 3 and cleaning of the glass panels 10a, 10b fitted into the screen frames 9a, 9b. Note that instead of the screen door 14 attached to the window frame 3, a screen door attached to the grille, such as that described in JP Patent Publication No. 2012-41731, can also be used.

In this example, both in-plane ends of the lower end of the grille body 15 are rotatably supported by the lower ends of the second mounting brackets 27 as described above. Specifically, as shown in FIG. 8, the lower end of the base plate 32 constituting the second mounting bracket 27 and the lower ends of the left and right vertical frames 23a and 23b constituting the grille body 15 are connected to each other using the lower hinge 41. As a result, as shown in FIG. 9, in the event of a fire, the grille body 15 can be swung open around a pivot axis located at the bottom of the grille body 15, like a so-called outward-tilting window. At this time, the lower end of the grille body 15 becomes the pivot end, and the upper end becomes the free end. When the grille body 15 is swung open in this way, the second mounting bracket 27 is integrated with the first mounting bracket 26. In this way, in this example, the opening pattern of the grille body 15 differs between the event of a fire and the event of maintenance work.

As shown in Fig. 10, the lower hinge 41 is composed of a pair of mounting plates 42a, 42b and a pin 43 which is a pivot shaft. Of the pair of mounting plates 42a, 42b, the mounting plate 42a which is fixed to the second mounting bracket 27 has a pair of screw holes 44 and a pair of support tubes 45a at one longitudinal end (lower end in mounted state) for supporting both ends of the pin 43. In contrast, of the pair of mounting plates 42a, 42b, the other mounting plate 42b which is fixed to the grille body 15 has a pair of pilot holes 46 and a support tube 45b at one longitudinal end (lower end in mounted state) for supporting the middle part of the pin 43. The lower hinge 41 is assembled by coaxially arranging one support tube 45b provided on the other mounting plate 42b between a pair of support tubes 45a provided on one mounting plate 42a, and inserting a pin 43 through these three support tubes 45a, 45b. Note that both ends of the pin 43 are crimped and deformed to prevent the pin 43 from falling off. By using the lower hinge 41 as described above, the lower ends of the vertical frames 23a, 23b of the grille main body 15 and the lower end of the base plate portion 32 of the second mounting bracket 27 are connected so as to be rotatable about the pin 43.

Under normal circumstances, the locking mechanism 17 holds the grille body 15 in the closed position to prevent it from swinging open around the pivot (pin 43) located at the bottom. The locking mechanism 17 for holding the grille body 15 in the closed position and the release mechanism 18 for releasing the locking mechanism 17 are described below.

Locking mechanism
The locking mechanism 17 is for holding the grille body 15 in the closed position, and includes a pair of bracket-side engaging portions 47 and a pair of grille-side engaging portions 48 .

As shown in Figs. 2 and 11, each of the bracket side engagement parts 47 has a substantially L-shaped cross section and is attached to the upper end of the base plate part 32 constituting the second mounting bracket 27. The bracket side engagement parts 47 include a fixing plate part 49 fixed to the outdoor side of the base plate part 32, and a hook part 50 bent at a substantially right angle from the upper end of the fixing plate part 49 toward the outdoor side. The fixing plate part 49 is fixed to the outdoor side of the base plate part 32 via a mounting base 51. The hook part 50 has a substantially L-shape in plan view, and has a protrusion part 52 at each outdoor end (tip part) that protrudes outward in the in-plane direction.

Each of the grille side engagement parts 48 is provided inside the upper end of the left and right vertical frames 23a, 23b that make up the grille main body 15. The grille side engagement parts 48 are formed by the shaft parts of the engagement bolts 53 that are arranged with their axial direction facing up and down. An opening 78 is formed in the part of the left and right vertical frames 23a, 23b that is located on the outdoor side of the grille side engagement parts 48 (engagement bolts 53) into which the hook parts 50 can be inserted.

When the grille body 15 is in the closed state, as shown in FIG. 11, the hook portion 50 constituting the bracket side engagement portion 47 is inserted inside through the opening 78 provided in the vertical frames 23a and 23b, and the protrusion portion 52 provided on the hook portion 50 is engaged from the outdoor side with the shaft portion of the engagement bolt 53 constituting the grille side engagement portion 48. This prevents the grille body 15 from swinging open around the pivot shaft (pin 43) located at the bottom, and holds the grille body 15 in the closed position.

Release mechanism
The release mechanism 18 automatically releases the locked state set by the lock mechanism 17 in the event of a fire, and is housed inside the upper frame 21 that constitutes the grille body 15, as shown in Figures 12 and 13. The release mechanism 18 includes a temperature sensor 54 for detecting temperature, and a mechanism body 55 that releases the lock mechanism 17 when the temperature sensor 54 detects that a predetermined temperature has been reached.

The temperature sensor 54 is a temperature fuse made of a thin metal plate such as a copper alloy, which melts when it reaches a certain temperature (e.g., about 60°C to 120°C).

The mechanism body 55 includes a pair of release arms 56a, 56b arranged with their longitudinal direction facing the in-plane direction, and a pressing part 57 that presses the pair of release arms 56a, 56b outward in the in-plane direction (tip side). The inner ends (base ends) of the pair of release arms 56a, 56b in the in-plane direction are connected to each other by a temperature sensor 54, which is a temperature fuse. Therefore, when the temperature sensor 54 detects that a predetermined temperature has been reached and melts, the connection between the pair of release arms 56a, 56b is released, and the pair of release arms 56a, 56b are allowed to move outward in the in-plane direction.

Each of the release arms 56a, 56b is made up of multiple members connected in series in the in-plane direction, and has an engagement bolt 53 at its outer end (tip) in the in-plane direction that constitutes the grille side engagement part 48. The release arms 56a, 56b are equipped with, in order from the outside to the inside in the in-plane direction, outer plate parts 59a, 59b, tension springs 60a, 60b, intermediate plate parts 61a, 61b, and inner plate parts 62a, 62b.

Each of the outer plate portions 59a, 59b is a flat member, and is provided with an engagement bolt 53 at its outer end in the in-plane direction, and its inner end in the in-plane direction is connected to a tension spring 60a, 60b. Each of the outer plate portions 59a, 59b has an oval guide hole 63 in the middle in the in-plane direction. A guide pin 64 fixed to the upper frame 21 is inserted into the guide hole 63. This allows the outer plate portions 59a, 59b to move parallel to the upper frame 21 in the in-plane direction, but prevents relative displacement in the indoor/outdoor direction.

Each of the tension springs 60a, 60b elastically connects the inner end of the outer plate portion 59a, 59b in the in-plane direction to the outer end of the intermediate plate portion 61a, 61b in the in-plane direction. The tension springs 60a, 60b apply a force pulling the outer plate portion 59a, 59b in the in-plane direction. This elastically presses the engagement bolt 53 provided on the outer plate portion 59a, 59b against the hook portion 50 constituting the bracket side engagement portion 47, preventing the engagement between the bracket side engagement portion 47 and the grille side engagement portion 48 from being accidentally released. In addition, when the grille main body 15 is swung around the pivot shaft (pin 43) located at the bottom to return the grille main body 15 from the open position to the closed position, the tension springs 60a, 60b each extend, allowing the engagement bolt 53 to be guided by the protrusion portion 52 of the hook portion 50 and to move outward in the in-plane direction. Therefore, simply by returning (swinging) the grille body 15 from the open position to the closed position, it is possible to engage the bracket side engagement portion 47 with the grille side engagement portion 48.

Each of the intermediate plate portions 61a, 61b is a flat plate-shaped member, with its outer end in the in-plane direction connected to the tension springs 60a, 60b, and its inner end in the in-plane direction fixed by screws to the outer end in the in-plane direction of the inner plate portions 62a, 62b.

Each of the inner plate portions 62a, 62b is a plate-like member having a crank-shaped cross section, and includes lower plates 65a, 65b and upper plates 66a, 66b arranged parallel to each other, and vertical plates 67a, 67b connecting the lower plates 65a, 65b and the upper plates 66a, 66b. Each of the inner plate portions 62a, 62b has the lower plates 65a, 65b arranged on the outer side in the in-plane direction screwed to the inner end of the intermediate plate portions 61a, 61b in the in-plane direction.

Under normal conditions, the inner plate portion 62a constituting one release arm 56a and the inner plate portion 62b constituting the other release arm 56b are connected to each other by the temperature sensor 54 with their respective inner ends in the in-plane direction butted against each other. As shown in Figures 12 and 14, an accommodation space 68 is formed between the pair of inner plate portions 62a, 62b.

A pressing portion 57 for pressing the pair of release arms 56a, 56b outward in the in-plane direction is disposed in the storage space 68. The pressing portion 57 includes a pair of compression springs 69a, 69b and a base portion 70. The base portion 70 is configured in a rectangular tube shape and is fixed to the center of the storage space 68 in the in-plane direction by a mounting screw 71. The compression springs 69a, 69b are disposed in a compressed state between both in-plane side surfaces of the base portion 70 and the vertical plates 67a, 67b. In addition, in order to prevent the compression springs 69a, 69b from falling off the base 70 when the pair of release arms 56a, 56b are moved outward in the in-plane direction by the pressing force of the pressing portion 57, anti-fall-off screws 72a, 72b, which are screwed into both sides of the base 70 in the in-plane direction, are inserted inside the compression springs 69a, 69b.

The temperature sensor 54, which is a temperature fuse, is positioned so as to straddle the upper surface of the upper plate 66a of the inner plate 62a constituting one release arm 56a and the upper surface of the upper plate 66b of the inner plate 62b constituting the other release arm 56b, and is fixed to the upper plates 66a, 66b by a pair of mounting screws 73a, 73b, respectively.

Under normal circumstances, the temperature sensor 54 connects one release arm 56a to the other release arm 56b, and prevents the pair of release arms 56a, 56b from moving outward in the in-plane direction even when subjected to the pressing force of the pressing part 57. However, in the event of a fire, when its own temperature reaches a predetermined temperature, it melts down and releases the connection between the pair of release arms 56a, 56b. In other words, the temperature sensor 54 in this example, which is a temperature fuse, not only performs the original function of a temperature sensor, which is to detect temperature, but also functions as a connecting member that connects one release arm 56a to the other release arm 56b.

When the temperature sensor 54 melts and the pair of release arms 56a, 56b are released from their connected state, as shown in FIG. 12B and FIG. 13B, the pair of release arms 56a, 56b move outward in the in-plane direction due to the pressing force of the pressing portion 57. As a result, the shaft portion of the engagement bolt 53 constituting the grille side engagement portion 48 moves outward in the in-plane direction beyond the protrusion portion 52 of the hook portion 50 constituting the bracket side engagement portion 47, and the engagement between the bracket side engagement portion 47 and the grille side engagement portion 48 is released.

In this example, in the event of a fire inside the room, in order to bring the temperature of the temperature sensor 54 itself closer to the temperature near the outdoor side of the window device 2 more quickly and accurately, an opening is formed in the upper frame 21 above the part where the temperature sensor 54 is installed, and the opening is covered with a lid member 74, and the tip of a reaction auxiliary member (screw) 75 attached so as to penetrate the lid member 74 is brought into contact with the temperature sensor 54. This allows the temperature near the outdoor side of the window device 2 to be transmitted to the temperature sensor 54 by the reaction auxiliary member 75, part of which (head) is exposed to the outside from the upper frame 21.

In this example, as shown in FIG. 2, a biasing member 76 is provided between the grille body 15 and the second mounting bracket 27 to bias the grille body 15 toward the outdoor side so that the grille body 15 automatically swings open when the locking mechanism 17 is released by the release mechanism 18. Specifically, the biasing member 76, which is a compression coil spring, is attached to the upper end (the lower end portion of the mounting base 51) of the outdoor side of the base plate 32 constituting the second mounting bracket 27. When the grille body 15 is held in the closed position by the locking mechanism 17, the biasing member 76 is compressed between the outdoor side of the base plate 32 constituting the second mounting bracket 27 and the indoor side of the left and right vertical frames 23a, 23b constituting the grille body 15. Therefore, when the locking mechanism 17 is released by the release mechanism 18, the biasing force of the biasing member 76 pushes the left and right vertical frames 23a, 23b to the outdoor side, and the grille body 15 automatically swings open. In addition, the biasing member 76 can be omitted by adjusting the center of gravity of the grille body 15 (for example, by placing the center of gravity on the outdoor side at the top).

In addition, as shown in FIG. 9, in order to regulate the opening angle (opening degree) of the grille body 15, an angle regulating means 77 is provided between the grille body 15 and the second mounting bracket 27. The angle regulating means 77 is made of a wire cut to a predetermined length, and both ends of the wire are fixed to the left and right vertical frames 23a and 23b constituting the grille body 15 and the base plate portion 32 constituting the second mounting bracket 27, respectively. Therefore, when the grille body 15 swings open, the angle regulating means 77 braces itself between the grille body 15 and the second mounting bracket 27, regulating the opening angle of the grille body 15. The opening angle of the grille body 15 can be changed by changing the length of the wire, and the extent to which the opening angle is regulated can be determined appropriately based on the environment of the outdoor side (corridor) of the grille body 15, and can be regulated to, for example, about 10 degrees to 40 degrees (30 degrees in this example).

According to the fire grille 1 of this embodiment as described above, even if a fire breaks out indoors with all the louvers 20 fully closed, heat dissipation from the window device 2 is not blocked.
That is, when a fire breaks out in the room and the temperature sensor 54 detects that the temperature has reached a predetermined temperature, the temperature sensor 54, which is a temperature fuse, melts itself and moves the pair of release arms 56a, 56b outward in the in-plane direction. Then, the lock mechanism 17 automatically releases the engagement between the bracket side engagement part 47 and the grille side engagement part 48, and the grille body 15 can be swung open around the pivot shaft (pin 43) located at the bottom. Therefore, the fire grille 1 of this example can prevent the heat dissipation from the window device 2 from being blocked. As a result, even if a fire breaks out in the room with all the louvers 20 fully closed, the heat dissipation from the window device 2 can be prevented from being blocked.

In particular, in this example, in the event of a fire, the grille body 15 can be swung open like a so-called outward-tilting window, widening the gap between the top of the window device 2 and the top of the grille body 15, allowing the rising high-temperature air to escape efficiently to the outside. This allows heat to be dissipated effectively from the window device 2. In addition, because the temperature sensor 54 is located inside the upper frame 21 that forms the upper edge of the grille body 15, it is easier to increase the temperature of the temperature sensor 54 itself compared to when it is located on the lower frame 22 or vertical frames 23a, 23b.

In this example, under normal circumstances, the grille body 15 is held in the closed position by engaging the bracket side engagement portion 47 provided on the mounting bracket 16 (second mounting bracket 27) with the grille side engagement portion 48 provided inside the vertical frames 23a, 23b of the grille body 15, so that the locking mechanism 17 does not need to be exposed to the outside when the grille body 15 is in the closed state. Furthermore, the release mechanism 18 for releasing the locking mechanism 17 is also housed inside the upper frame 21 that constitutes the grille body 15, and does not need to be exposed to the outside. This improves the design of the fire grille 1.

In addition, because a temperature fuse is used as the temperature sensor 54 constituting the release mechanism 18, the temperature sensor 54 can also function as a connecting member connecting the base ends of the pair of release arms 56a, 56b. This allows for a reduction in the number of parts and a reduction in the weight of the device. Furthermore, because the release mechanism 18 can be composed of the release arms 56a, 56b equipped with the grille side engagement portion 48 and the pressing portion 57 that presses the release arms 56a, 56b, the release mechanism 18 can be made small and composed of fewer parts.

Furthermore, in this example, the upper end of the mounting plate portion 30 constituting the first mounting bracket 26 and the upper end of the base portion 32 constituting the second mounting bracket 27 are connected to each other using an upper hinge 34, so that it is possible to perform maintenance work on the window device 2 by swinging the grille body 15 open, just like a so-called protruding window.

In the above-mentioned embodiment, the case where the lower end of the grille body (frame body) is supported rotatably relative to the mounting bracket as the opening pattern of the grille body in the event of a fire has been described, but although it is outside the technical scope of the present invention, for example, as shown in Fig. 15(A), the upper end of the grille body 15 may be supported rotatably relative to the mounting bracket 16, and the grille body 15 may be swung open like a so-called protruding window in the event of a fire, or as shown in Fig. 15(B), one of the left and right ends (left and right ends) of the grille body 15 may be supported rotatably relative to the mounting bracket 16, and the grille body 15 may be swung open like a so-called single-opening window in the event of a fire. Furthermore, as shown in Fig. 15(C), one of the left and right ends of the two divided grille bodies 15a and 15b may be supported rotatably relative to the mounting bracket 16, and the two grille bodies 15a and 15b may be swung open like a so-called double-opening window in the event of a fire.

As shown in Figure 15 (A), when the upper end of the grille body 15 is supported rotatably relative to the mounting bracket 16, the release mechanism can be housed inside the lower frame that forms the lower side of the grille body 15. Also, as shown in Figures 15 (B) and (C), when one of the left or right ends (left end or right end) of the grille body 15, 15a, 15b is supported rotatably relative to the mounting bracket 16, the release mechanism can be housed inside the vertical frame that forms the free end located opposite the end that serves as the pivot end.

When implementing the present invention, as shown in Figures 15(A) to (C), multiple (for example, two) grille bodies 15, 15a, and 15b can be arranged vertically side by side, like a so-called stepped window. In this case, the mounting bracket 16 can be shared between the multiple grille bodies 15, 15a, and 15b.

In the embodiment, the temperature sensor constituting the release means is described as being placed in the center of the upper frame in the in-plane direction, but the position of the temperature sensor is not particularly limited, and it may be placed biased toward the outer screen side (one side) or the inner screen side (the other side) in the in-plane direction. Also, the temperature sensor (temperature fuse) may be placed at the indoor end (the end closest to the window device) of the internal space of the upper frame.

In the embodiment, a case has been described in which a bracket-side engaging portion having a hook shape is engaged with a grille-side engaging portion having an axis shape, but the shapes of the bracket-side engaging portion and the grille-side engaging portion are not particularly limited. For example, it is possible to use a bracket-side engaging portion having an axis shape and a grille-side engaging portion having a hook shape.

In the embodiment, a case has been described in which a wire is used as the angle restriction means for restricting the opening angle of the grille body, but the structure of the angle restriction means is not particularly limited, and for example, a link mechanism used in sliding windows can be used, or a hinge that can restrict the opening angle can be used. In addition, a biasing means for biasing the grille body toward the outdoors can also be used as the angle restriction means.

REFERENCE SIGNS LIST 1 Fireproof grille 2 Window device 3 Window frame 4 Inner screen 5 Outer screen 6 Upper frame 7 Lower frame 8 Vertical frame 9a, 9b Screen frame 10a, 10b Glass panel 11a, 11b Upper guide rail 12a, 12b Roller 13a, 13b Lower guide rail 14 Screen screen 15, 15a, 15b Grille body 16 Mounting bracket 17 Locking mechanism 18 Release mechanism 19 Frame body 20 Louver 21 Upper frame 22 Lower frame 23a, 23b Vertical frame 24 Support pin 25 Operating lever 26 First mounting bracket 27 Second mounting bracket 28 Locking groove 29 Extension plate portion 30 Mounting plate portion 31 Locking piece 32 Base portion [0033] 33 Guide plate portion 34 Upper hinge 35a, 35b Mounting plate 36 Pin 37 Screw hole 38 Support cylinder portion 39 Lower hole 40 Hook portion 41 Lower hinge 42a, 42b Mounting plate 43 Pin 44 Screw hole 45a, 45b Support cylinder portion 46 Lower hole 47 Bracket side engagement portion 48 Grille side engagement portion 49 Fixing plate portion 50 Hook portion 51 Mounting base 52 Protrusion portion 53 Engagement bolt 54 Temperature sensor 55 Mechanism portion main body 56a, 56b Release arm portion 57 Pressing portion 58 Fixing screw 59a, 59b Outer plate portion
60a, 60b Tension spring 61a, 61b Intermediate plate portion 62a, 62b Inner plate portion 63 Guide hole 64 Guide pin 65a, 65b Lower plate 66a, 66b Upper plate 67a, 67b Vertical plate 68 Storage space 69a, 69b Compression spring 70 Base portion 71 Mounting screw 72a, 72b Fall prevention screw 73a, 73b Mounting screw 74 Lid member 75 Reaction auxiliary member 76 Pressing member 77 Angle restriction means 78 Opening

Claims (5)

A mounting bracket that is attached to an outdoor side of a window frame that constitutes the window device;
a surface grille body having a rectangular frame shape, a frame body having a lower end rotatably supported on the mounting bracket, and a plurality of louvers supported inside the frame body so as to be openable and closable;
a locking mechanism for holding the grille body in a closed position ;
a release mechanism having a temperature sensor for releasing the lock mechanism;
and an angle regulating means for regulating an opening angle of the grille body ,
the angle restriction means prevents the opening angle of the grille body from becoming larger than the opening angle in a state in which an opening is formed between an upper portion of the grille body and an upper portion of the window device,
A fireproof grille that, when the temperature sensor detects that a predetermined temperature has been reached, releases the locking mechanism and swings the grille body open. 2. The fire grille according to claim 1, wherein the opening angle of the grille body is between 10 degrees and 40 degrees. 2. The fireproof grille according to claim 1, wherein the angle restriction means is formed separately from the grille body. 4. A fire grille according to claim 3, wherein the angle restriction means is provided between an upper portion of the grille body and an upper portion of the mounting bracket. 4. A fire grille according to claim 3, wherein said angle restriction means is formed of a wire.

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