JP7467257B2 - Screen tightening mechanism and opening/closing device equipped with said mechanism - Google Patents

Description

The present invention relates to a screen tightening mechanism and an opening and closing device equipped with said mechanism, and in particular to a fire-prevention opening and closing device that can be used as a fire prevention facility.

In the event of a fire, there is a demand for installing fire protection equipment at the openings of buildings to prevent possible personal injury and the spread of fire. In recent years, fire protection opening and closing devices equipped with a flexible sheet-like screen that can be rolled up and down along a frame attached to the inner periphery of the opening of a building have been used as such fire protection equipment.

For example, Japanese Patent Application Laid-Open Publication No. 8-303147 discloses an opening and closing device equipped with a roll screen in which a weight bar 6 is attached to the lower end of the fabric 2 serving as the screen in order to keep the fabric 2 in a stretched state.

Japanese Patent Application Laid-Open No. 8-303147

In the opening and closing device described in Patent Document 1, the fabric 2 serving as a screen made of a non-flammable or flame-retardant material such as silica cloth is pulled downward by the weight of the weight bar 6, and is maintained in a stretched state. Therefore, it is effective in preventing flames from penetrating the interior and exterior in the event of a fire, and in protecting privacy in peacetime.
However, in the opening and closing device of Patent Document 1, in order to allow people to pass through during evacuation, the vertical side of the fabric 2 is left free and the weight bar 6 and the bottom end of the fabric are divided. Therefore, in the opening and closing device of Patent Document 1, there is a possibility that the fabric 2 will be turned up and the closed state will be released due to deformation of the opening in the event of a fire, or negative pressure generated by indoor air circulation or strong winds during normal times.
Therefore, in the opening and closing device of Patent Document 1, there is a risk that flames may penetrate from the inside to the outside in the event of a fire, preventing the device from providing fire protection performance, and there is also a risk that privacy may not be adequately protected during peacetime.

The present invention was made to solve these problems, and aims to provide a screen tightening mechanism that can prevent the screen of an opening and closing device from being lifted up and released from the closed state during both fire and peacetime, and an opening and closing device equipped with said mechanism.

The tightening mechanism of the present invention for solving the above problems is a screen tightening mechanism that maintains a closed state using a screen that is movable in the vertical direction, and is characterized in that it comprises a base member provided at the lower end of the screen, and a latch member rotatably provided on the base member, the latch member having a lever portion that extends in a direction away from the rotational axis direction of the latch member, the base member having an operating portion that is operated when the screen moves up and down, and the upper surface of the operating portion is located above the upper surface of a bottom frame attached to the lower end of the screen .

In order to solve the above problems, the opening and closing device of the present invention comprises a left guide frame, a right guide frame and a lower frame, a screen whose widthwise ends are surrounded by the left guide frame and the right guide frame and which is wound and unwound along the left guide frame and the right guide frame, a storage box for accommodating the screen, a base member provided at the lower end of the screen, and a screen tightening mechanism comprising a latch member rotatably provided on the base member, wherein the latch member is formed with a lever portion extending in a direction away from the rotation axis direction of the latch member , the base member is provided with an operating portion that is operated when the screen moves up and down, and the upper surface of the operating portion is located above the upper surface of the bottom frame attached to the lower end of the screen .

In the opening and closing device of the present invention, it is preferable that the lower frame is formed with a latching portion to which the latch member is engaged when the screen is in the closed state.

In the opening and closing device of the present invention, it is preferable that the lower frame has a chamfered portion between the upper surface and the indoor side surface.

The opening and closing device of the present invention preferably further includes a lower frame reinforcement material that supports the lower frame from the inside.

The opening and closing device of the present invention preferably further includes guide frame reinforcement members that support the left and right guide frames from their insides.

The opening and closing device of the present invention further comprises a guide frame reinforcement material that supports the left and right guide frames from their insides, and a bottom frame reinforcement material that supports the bottom frame from its insides, and preferably comprises a heat foaming material in the space between the longitudinal end of the bottom frame reinforcement material and the longitudinal end of the guide frame reinforcement material. In this case, it is preferable to provide the heat foaming material on the longitudinal lower end side of the guide frame. Also in this case, it is preferable to provide the heat foaming material between the bottom frame and the outdoor side inner surface and/or the indoor side inner surface of the left and right guide frames.

According to the present invention, the weight of the lever portion biases the latch member against the portion to which the latch member is to be engaged, such as a building with an opening or the lower frame of an opening/closing device provided at the opening. In addition, the reinforcing material and the heated foaming material provided on the lower frame that houses the lower end of the screen and the left and right guide frames that house the vertical sides of the screen suppress deformation of the frame during a fire and maintain the engagement of the latch member, so that the screen of the opening/closing device can be prevented from being lifted up and released from the closed state during a fire and in peacetime. Therefore, in a fire, flames can be prevented from penetrating from the inside to the outside, and sufficient fire protection performance can be achieved. In addition, privacy can be adequately protected during peacetime.

FIG. 1 is a central vertical cross-sectional view of a fire protection opening and closing device according to an embodiment; Cross-sectional view of the same Enlarged view of the main part of the screen Bottom frame enlarged view Enlarged view of the main part at the lower end of the right guide frame FIG. 1 is an enlarged view of the lower frame and the tightening mechanism, showing the state in which the tightening mechanism is engaged with the lower frame; FIG. 1 is an enlarged view of the lower frame and the tightening mechanism, showing a state in which the tightening mechanism and the lower frame are disengaged from each other; 1A to 1E are a plan view, a front view, a right side view, a left side view, and a bottom view of a base member, respectively. 1A to 1E are a plan view, a front view, a right side view, a left side view, and a bottom view of a latch member, respectively. Schematic perspective view of a fastening mechanism FIG. 13 is a diagram showing a state in which the base member and the latch member are connected to each other.

The following describes in detail the embodiments of the present invention with reference to the drawings. In this specification, common components are shown with the same terminology, are illustrated in substantially the same manner in each drawing, and detailed descriptions are omitted, and are indicated by the same reference numerals as necessary.

Figure 1 is a central vertical cross-sectional view of an opening/closing device equipped with a mechanism for maintaining a screen in a closed state according to this embodiment, and Figure 2 is a horizontal cross-sectional view of the same. The opening/closing device 1 of this embodiment is applicable as a shutter device that is disposed in or inside an opening in a building or structure such as a house, a building, a warehouse, a factory, an underground shopping mall, a tunnel, or a vehicle loading platform, and that opens and closes the opening, or partitions or opens the space inside the structure, but as a particularly preferred embodiment, an example of a window shutter device that is attached to the indoor side of a sash window in an opening in a building will be described.

As shown in Figures 1 and 2, the opening and closing device 1 of this embodiment includes a right guide frame 2, a left guide frame 3, a lower frame 4, a screen 5, and a storage box 6.

The fire opening and closing device 1 is attached to the inner periphery 7a of an opening 7, such as a window or an entrance, provided in a building. In this embodiment, the inner periphery 7a is formed by a frame 8 attached to the opening 7, as in a wooden or reinforced concrete construction. The fire opening and closing device 1 may be attached directly to the opening 7 without attaching the frame 8.

The right guide frame 2 and the left guide frame 3 are configured substantially identically, so an example of the configuration of the right guide frame 2 will be described, and an example of the configuration of the left guide frame 3 will be omitted. In this embodiment, the right guide frame 2 includes an outer guide portion 21 and an inner guide portion 22, as shown in FIG. 2. The outer guide portion 21 is elongated and has a substantially U-shaped cross section. Specifically, the outer guide portion 21 includes a first wall portion 21a that abuts against the inner circumferential surface 7a, a second wall portion 21b that is located on the outdoor side of the opening 7, a third wall portion 21c that is located on the indoor side of the opening 7, and a pair of fourth wall portions 21d that face the left guide frame 3, as shown in FIG. 2. In the right guide frame 2 of this embodiment, the first wall portion 21a, the second wall portion 21b, and the third wall portion 21c are configured so that, when the fire opening/closing device 1 is attached to the opening 7, the longitudinal ends on the lower frame 4 side abut against the inner circumferential surface 7a to which the lower frame 4 is attached. In addition, the pair of fourth wall portions 21d have their longitudinal ends cut out on the lower frame side, and are configured so that when the fire opening and closing device 1 is attached to the opening 7, the longitudinal ends on the lower frame 4 side abut against the upper surface 44a of the upper portion 44 of the lower frame 4, which will be described later.

A pair of outdoor protruding walls 21e are formed at the outdoor end of the first wall 21a. The pair of outdoor protruding walls 21e have bent portions 21f at their tips that bend toward each other. In the outer guide section 21, the first wall 21a, the pair of outdoor protruding walls 21e, and the bent portions 21f form an outdoor storage section 21g.

A pair of indoor side protruding walls 21h are formed at the indoor end of the first wall 21a. The pair of indoor side protruding walls 21h have bent portions 21i at their tips that bend toward each other. The outer guide portion 21 has an indoor side storage portion 21j formed by the first wall 21a, the pair of indoor side protruding walls 21h, and the bent portions 21i.

The first wall portion 21a has a pair of protruding walls 21k formed between a pair of outdoor-side protruding walls 21e and a pair of indoor-side protruding walls 21h.

An opening 21l is formed between the pair of fourth walls 21d. A pair of protrusions 21m that protrude toward the first wall 21a are formed at the ends of the pair of fourth walls 21d on the opening 21l side. The end of the bottom frame 11 to which the leading edge of the screen 5 is attached fits into the opening 21l, and when the screen 5 is wound and unwound, the bottom frame 11 slides up and down while being guided by the pair of protrusions 21m.

In this embodiment, a guide frame reinforcement 23 is provided on the inner circumference of the outer guide section 21. In this embodiment, the guide frame reinforcement 23 is provided from the upper end of the right guide frame 2 in the longitudinal direction to the imaginary line position of the upper surface 44a of the upper portion 44 where the recess 42 of the lower frame 4 described later is formed. In other words, in this embodiment, the guide frame reinforcement 23 is not provided below the upper surface 44a of the lower frame 4. The guide frame reinforcement 23 in this embodiment is formed along the entire inner circumference of the outer guide section 21 in the longitudinal direction, as shown in FIG. 2.

The guide frame reinforcement 23 supports the outer guide section 21 from the inside, giving the outer guide section 21 the rigidity to withstand deformation caused by external forces such as fire, and preventing flames from penetrating the outer guide section 21 from inside and outside the building.

The outer guide portion 21 may be, for example, an aluminum molded part, and the guide frame reinforcement member 23 may be, for example, a steel molded part. In this embodiment, the outer guide portion 21 and the guide frame reinforcement member 23 are fastened together to the inner peripheral surface 7a of the frame 8 by screws, as shown in FIG. 2.

The outdoor storage section 21g contains a heating foam material 9 as the guide frame opening side heating foam material 9c on both ends. The heating foam material 9 is fixed to the outdoor storage section 21g via adhesive, double-sided tape, etc. The heating foam material 9 expands when heated, and exhibits fire resistance and fire prevention performance. Therefore, even if a gap occurs between the right guide frame 2 and the inner surface 7a during a fire due to deformation of the frame or distortion of the structure, the heating foam material 9 closes the gap, preventing flames from penetrating inside and outside the room. For example, Sekisui Chemical Co., Ltd.'s FiBlock (registered trademark) can be used as the heating foam material 9.

The first wall 21a of the outer guide 21 is fixed to the inner circumferential surface 7a, and the outdoor storage section 21g is blocked by the inner circumferential surface 7a, so that the heated foaming material 9 is contained between the inner circumferential surface 7a and the outer guide 21. Therefore, even if the heated foaming material 9 peels off from the outdoor storage section 21g due to deterioration of the adhesive over time or melting of the adhesive (approximately 120°C) before the heated foaming material 9 starts to expand (approximately 200°C), the attachment position is maintained, and the function of the heated foaming material 9 is not impaired.

In this embodiment, a gap-hiding material 10 such as an elastic material is placed in the indoor storage section 21j where the heated foam material 9 is not placed, and light leakage from the outdoor side due to the gap that occurs between the inner circumferential surface 7a and the first wall section 21a is suppressed.

Figure 3 is an enlarged view of the main part of the screen. The inner guide part 22 can be, for example, an aluminum molded product, and is formed of a cylindrical shape having slits 22a as guide grooves for sliding the vertical sides 5a of both edges of the screen 5, as shown in Figures 2 and 3. In this embodiment, the inner guide part 22 has a gap formed by fitting the outdoor side member 22c to the indoor side member 22b as the slit 22a. The inner guide part 22 is formed in an elongated shape so as to follow the outer guide part 21, and is placed on the lower frame 4 arranged (swallowed) at the lower end of the outer guide part 21 in an independent state without being fixed to the outer guide part 21. In other words, the inner guide part 22 is housed inside the outer guide part 21 so that a clearance is formed around all sides of the outer guide part 21.

The lower frame 4 can be, for example, an aluminum molded part, and is long and fixed between the lower ends of the right guide frame 2 and the left guide frame 3 as shown in Figures 1 and 2, with a cross-sectional shape formed into a roughly C-shape. The back surface 41a of the bottom 41 of the lower frame 4 serves as the attachment surface for the inner peripheral surface 7a, and the upper portion 44 on the side opposite the bottom 41 is provided with a recess 42 into which the lower end of the bottom frame 11 provided at the lower end of the screen 5 described later fits.

In particular, in this embodiment, the lower frame 4 is configured so that both ends of the longitudinal end 4E do not come into contact with the right guide frame 2 and the left guide frame 3. In other words, the lower frame 4 in this embodiment is configured so that there is a gap between both ends of the longitudinal end 4E and the right guide frame 2 and the left guide frame 3.

The lower frame 4 of this embodiment is provided with a lower frame reinforcement 43. The lower frame reinforcement 43 can be a molded part made of stainless steel or steel, and in this embodiment, it is formed over the entire length of the lower frame 4, abutting against the bottom 41 of the lower frame 4 and conforming to the recess 42, supporting the lower frame 4 from the inside. By providing this lower frame reinforcement 43, the rigidity of the lower frame 4 is increased to suppress deformation due to external forces caused by a fire, and even if flames during a fire reach the lower frame 4, it is possible to prevent the flames from penetrating between the indoors and outdoors.

Specifically, in the longitudinal cross section of the lower frame reinforcement 43 of this embodiment, the lower frame reinforcement 43 is formed from a bottom portion 43a that abuts against the bottom portion 41 of the lower frame 4, a pair of standing portions 43b that extend from both ends of the bottom portion 43a toward the upper portion 44 of the lower frame 4, and a pair of bent portions 43c that extend in the indoor/outdoor direction from the ends of the pair of standing portions 43b on the upper portion 44 side of the lower frame 4.

The bottom 43a has a dimension in the longitudinal cross section of the lower frame reinforcement 43 that is equal to the distance between a pair of outdoor-side protruding wall portions 41e and a pair of indoor-side protruding wall portions 41h of the lower frame 4, which will be described later. The bottom of the bottom frame 11 abuts against this bottom 43a when the screen 5 is in the closed state. The pair of bent portions 43c are configured parallel to the bottom 43a, and the indoor end and outdoor end are each covered by the upper portion 44 of the lower frame 4.

In particular, in this embodiment, the lower frame reinforcement 43 is formed over the entire length of the lower frame 4, so that the lower frame reinforcement 43 is also configured so that both sides of the longitudinal end 43E do not come into contact with the right guide frame 2 and the left guide frame 3. In other words, the lower frame reinforcement 43 in this embodiment is configured so that there is a gap between both sides of the longitudinal end 43E and the right guide frame 2 and the left guide frame 3.

In this embodiment, the guide frame reinforcement 23 is not provided below the upper surface 44a of the lower frame 4, and the lower frame reinforcement 43 is not provided between both sides of the longitudinal end 43E of the lower frame 4 and the right guide frame 2 and the left guide frame 3. That is, in this embodiment, a space where neither the guide frame reinforcement 23 nor the lower frame reinforcement 43 is provided, that is, a space S for absorbing thermal expansion of the frame reinforcement, is secured in a part of the joint between the right guide frame 2 and the left guide frame 3 and the lower frame 4. The longitudinal end 43E of the lower frame reinforcement 43 and the longitudinal end 23E of the guide frame reinforcement 23 face this space S.

The fire opening and closing device 1 of this embodiment has a heating foam material 9 as the guide frame lower end heating foam material 9a in this space S. Specifically, in this embodiment, the heating foam material 9 is fixed to the inner surface of the first wall portion 21a of the outer guide portion 21 of the right guide frame 2 via adhesive, double-sided tape, etc. In this embodiment, as shown in the enlarged view of the main part of the longitudinal lower end side of the right guide frame 2 in FIG. 5, the heating foam material 9 is fixed to the longitudinal end (longitudinal lower end side) of the first wall portion 21a on the lower frame 4 side, and is fixed with a gap from the longitudinal end 23E of the guide frame reinforcement material 23. In addition, in this embodiment, the heating foam material 9 is fixed with a gap from the second wall portion 21b and the third wall portion 21c. Furthermore, in this embodiment, the heating foam material 9 faces the longitudinal end 43E of the lower frame reinforcement material 43, and has a size that covers almost the entirety of it.

In the fire opening and closing device 1 of this embodiment, the heated foam material 9 expands in the event of a fire and blocks the space S where no frame reinforcement material is provided, thereby preventing flames from penetrating from the inside to the outside through the space S.

Figure 6 is an enlarged view of the lower frame 4 and the tightening mechanism 12, showing the state in which the tightening mechanism 12, described later, is engaged with the lower frame 4, and Figure 7 is an enlarged view of the lower frame 4 and the tightening mechanism 12, showing the state in which the engagement between the tightening mechanism 12 and the lower frame 4 is released. As shown in these figures, in the lower frame 4 of this embodiment, grooves 47 are formed on the side surface 45a of the indoor side portion 45 and the side surface 46a of the outdoor side portion 46. The grooves 47 on the side surface 45a of the indoor side portion 45 engage the latch members 14 of the tightening mechanism 12, described later, which are attached to the bottom frame 11 of the screen 5, in order to maintain the closed state of the screen 5. That is, in this embodiment, the grooves 47 formed on the side surface 45a of the indoor side portion 45 constitute the engaged portion.

In the fire opening and closing device 1 of this embodiment, the groove 47 also has a heating foam material 9 as the heating foam material 9b on the indoor/outdoor side of the lower frame. Specifically, in this embodiment, the heating foam material 9 is fixed to both sides of the longitudinal end 4E of the lower frame inside the groove 47 via adhesive, double-sided tape, etc.

As shown in Figures 6 and 7, the lower frame 4 of this embodiment has a chamfered portion 48 between the upper surface 44a and the indoor side surface 45a. In this embodiment, a chamfered portion 48 is also formed between the upper surface 44a and the outdoor side surface 46a.

In this way, the fire opening and closing device 1 of this embodiment has the heated foaming material 9 between the bottom frame 4 and the inner surface of the second wall portion 21b and the inner surface of the third wall portion 21c of the right guide frame 2 (and the left guide frame 3), i.e., between the bottom frame 4 and the outdoor inner surface and the indoor inner surface of the right guide frame 2 (and the left guide frame 3). In other words, in this embodiment, the heated foaming material 9 is concealed by the right guide frame 2 (and the left guide frame 3), so it does not impair the aesthetics of the opening and closing device. In addition, in the event of a fire, the surface temperature of not only the bottom frame 4 but also the right guide frame 2 (and the left guide frame 3) is sensed, so that even if the surface temperature of one of the bottom frame 4 and the right guide frame 2 (and the left guide frame 3) does not rise, foaming can be caused by the rise in the surface temperature of the other.

In the fire opening and closing device 1 of this embodiment, the heated foam material 9 expands in the event of a fire, blocking the gap between the bottom frame 4 and the outdoor side inner surface and the indoor side inner surface of the right guide frame 2 (and the left guide frame 3), thereby preventing flames from penetrating from the inside to the outside through the gap between the bottom frame 4 and the outdoor side inner surface and the indoor side inner surface of the right guide frame 2 (and the left guide frame 3).

On the back surface 41a, a pair of outdoor side protruding wall portions 41e having bent portions 41f at their tips are formed, similar to the first wall portion 21a of the right guide frame 2, forming an outdoor side storage portion 41g. Also, on the back surface 41a, a pair of indoor side protruding wall portions 41h having bent portions 41i at their tips are formed, forming an indoor side storage portion 41j.

The outdoor storage section 41g, like the outdoor storage section 21g, contains the heated foaming material 9 as the lower frame opening side heated foaming material 9d across both ends. The back surface 41a of the lower frame 4 is fixed to the inner circumferential surface 7a, and the outdoor storage section 41g is closed by the inner circumferential surface 7a, so that the heated foaming material 9 is contained between the inner circumferential surface 7a and the outdoor storage section 41g. Therefore, even if the heated foaming material 9 peels off from the outdoor storage section 41g due to deterioration of the adhesive over time or melting of the adhesive (approximately 120°C) before the heated foaming material 9 starts to expand (approximately 200°C), the attachment position is maintained, and the function of the heated foaming material 9 is not impaired.

The indoor storage section 41j contains a gap concealing material 10, similar to the indoor storage section 21j. This gap concealing material 10 prevents light from leaking from the outdoors through a gap that occurs between the inner periphery 7a and the back surface 41a.

In this embodiment, the heated foam material 9 is placed in the outdoor storage section 21g of the right guide frame 2 (and the left guide frame 3) and the outdoor storage section 41g of the lower frame 4, but the position, range and number of the heated foam material 9 are not limited as long as it is on the opening 7 (inner surface 7a) side. For example, it may be placed in the indoor storage section 21j and the indoor storage section 41j, or it may be placed in both the outdoor storage section 21g and the outdoor storage section 41g and the indoor storage section 21j and the indoor storage section 41j. The heated foam material 9 may also be placed in the center of the first wall section 21a and the back surface 41a.

The screen 5 is fireproof and made of glass cloth, silica cloth, or these cloths coated with or impregnated with fireproof paint. As shown in FIG. 3, a pair of vertical sides 5a of the screen 5 are formed with anti-slip sections 51 made of threads made of a non-combustible material. The anti-slip sections 51 are located inside the inner guide section 22. The anti-slip sections 51 prevent the vertical sides 5a from slipping out of the slits 22a of the inner guide section 22 when the screen 5 is subjected to a bending force.

The thread made of a non-combustible material that makes up the retaining portion 51 can be, for example, a thread made of stainless steel, and in this embodiment, the retaining portion 51 is made of stainless steel thread. The diameter of the thread that can be used is, for example, 0.35 mm to 1.06 mm, and the retaining portion 51 in this embodiment is made of stainless steel thread with a thickness of 0.35 mm. In particular, in this embodiment, the retaining portion 51 is made into an approximately spherical shape by sewing the stainless steel thread multiple times along the vertical side 5a, and is formed to a thickness that does not pass through the slit 22a.

In this embodiment, the retaining auxiliary parts 52 made of a non-combustible material are formed at the widthwise end of the screen 5. In particular, in this embodiment, the retaining auxiliary parts 52 are formed at regular intervals in the height direction of the screen 5 (the longitudinal direction of the right guide frame 2 and the left guide frame 3) so as to overlap the retaining parts 51. For example, stapler needles can be used as such retaining auxiliary parts 52. In this embodiment, a stainless steel stapler needle with a needle thickness of 0.5 mm, a needle foot length of 6.0 mm, and a width of 11.6 mm is used. In addition to stainless steel, steel, aluminum, copper, etc. can be used as the material for the stapler needle. The material of the stapler needle may be the same as or different from the material of the thread made of a non-combustible material that constitutes the retaining part 51.

The screen 5 of this embodiment has a metal plate 53 made of a non-combustible material at its lower end. Specifically, the screen 5 of this embodiment has an aluminum plate 53 formed along the lower end 5b of the screen 5 across the entire width of the screen 5. This aluminum plate 53 is attached to the screen 5 with double-sided tape.

In this embodiment, the screen 5 is also provided at the lower end with a retaining portion 51 made of threads made of a non-combustible material. Specifically, the retaining portion 51 made of threads made of a non-combustible material is provided along the lower end of the plate 53 made of a non-combustible material.

Figure 4 is an enlarged view of the bottom frame 11. As shown in Figures 1 and 4, the bottom frame 11 is attached to the entire lower end of the screen 5 in this embodiment so as to cover the entire lower end. The bottom frame 11 can be, for example, an aluminum molded product. In this embodiment, the bottom frame 11 is screwed to the screen 5 using an aluminum plate 53 as a seat. In particular, in this embodiment, the bottom frame 11 is composed of an indoor member 111 and an outdoor member 112, and the screen 5 is screwed to the outdoor member 112 with the lower end of the screen 5 sandwiched between the aluminum plate 53 as a seat, and then the indoor member 111 is fitted and screwed to the outdoor member 112. Therefore, the bottom frame 11 is attached so that the aluminum plate 53 and the entire retaining portion 51 provided at the lower end are covered by the bottom frame 11.

The indoor side member 111 constituting the bottom frame 11 attached to the screen 5 has an opening 111a formed on the indoor side and a storage section 111b that stores the mounting section 131 of the base member 13 described later, formed over the entire longitudinal direction. The storage section 111b is formed in communication with the opening 111a. In this embodiment, the base member 13 is provided at the lower end of the screen 5 by storing the mounting section 131 of the base member 13 in the storage section 111b.

The opening and closing device 1 of this embodiment includes a base member 13 provided at the lower end of the screen 5, and a tightening mechanism 12 for the screen 5 including a latch member 14 rotatably provided on the base member 13. (A) to (E) of FIG. 8 are a plan view, a front view, a right side view, a left side view, and a bottom view of the base member 13, respectively. The base member 13 can be made of, for example, aluminum die casting, and includes an attachment section 131 accommodated in the accommodation section 111b of the indoor side member 111, a connecting section 132 to which the latch member 14, which constitutes the tightening mechanism 12 together with the base member 13, is connected, and an operating section 133 that is operated when the screen 5, which is at any vertical position, moves up and down. The dimension of the base member 13 in the longitudinal direction (the left-right direction in the opening and closing device) can be any length as long as the base member 13 can be provided on the screen 5 (the indoor side member 111 in this embodiment). In this embodiment, the longitudinal dimensions of all parts of the base member 13 are shorter than those of the indoor member 111.

The base member 13 can be attached to the indoor side member 111 by inserting the attachment portion 131 from the longitudinal end of the storage portion 111b. In this embodiment, the attachment portion 131 and the storage portion 111b are configured so that a small gap is created between the attachment portion 131 and the storage portion 111b when the attachment portion 131 is stored in the storage portion 111b. With this configuration, the attachment portion 131 inserted from the longitudinal end of the storage portion 111b can slide longitudinally within the storage portion 111b. Therefore, in this embodiment, it can be easily moved to the fixed position of the base member 13 in the longitudinal direction of the indoor side member 111.

A screw hole 131a is formed on each of the longitudinal ends of the lower end of the mounting portion 131. The base member 13 is fixed to a position in the longitudinal direction of the indoor side member 111 by being screwed into a screw hole (not shown) formed in the indoor side member 111 via the screw hole 131a. The fixing position of the base member 13 in the longitudinal direction of the indoor side member 111 can be changed to any position by changing the position of the screw hole formed in the indoor side member 111. In this embodiment, the base member 13 is fixed to the longitudinal center of the indoor side member 111.

The connecting portion 132 to which the latch member 14 is connected has a generally cylindrical shape. The connecting portion 132 has screw holes 132a formed on both longitudinal end side surfaces for screwing the latch member 14. In this embodiment, the connecting portion 132 is configured such that both longitudinal ends are located longitudinally inward relative to the diameter of the screw holes 131a formed in the mounting portion 131. This configuration prevents the connecting portion 132 from interfering with the screwing of the mounting portion 131, while preventing the vertical dimension of the mounting portion 131, i.e., the vertical dimension of the base member 13, from increasing.

In this embodiment, the connecting portion 132 is connected (formed continuously) to the mounting portion 131 via the connecting portion 134. The connecting portion 134 is configured so that both ends in the longitudinal direction are flush with both ends of the mounting portion 131.

The base member 13 of this embodiment has a notched cylindrical portion 135 between the coupling portion 132 and the connection portion 134. The notched cylindrical portion 135 has a shape obtained by cutting out a cylinder concentric with the column of the coupling portion 132, and is configured so that both ends in the longitudinal direction are flush with both ends of the coupling portion 132.
In addition, an arc-shaped recess 134a is formed in the connecting portion 134 between both longitudinal ends and both longitudinal ends of the coupling portion 132. In this embodiment, the arc surface of the recess 134a and the outer arc surface of the cutout cylindrical portion 135 are formed by the arc surface of the same circle.

The operating section 133 in this embodiment is configured so that both ends in the longitudinal direction are located outboard of both ends in the longitudinal direction of the mounting section 131 and the connection section 134. The upper surface 133a of the operating section 133 abuts against the lower surface of the storage box 6 when the screen 5 is wound up on the drum 62 described below and the bottom frame 11 moves upward, and also functions as an abutment surface that determines the position of the top of the bottom frame 11. In addition, a plate-shaped section 136 extending upward from the upper end of the connection section 134 on the indoor side is connected to the lower surface 133b of the operating section 133. The plate-shaped section 136 is configured so that both ends in the longitudinal direction are flush with both ends of the mounting section 131 and the connection section 134.

Figures 9 (A) to (E) are respectively a plan view, a front view, a right side view, a left side view, and a bottom view of the latch member 14. The latch member 14 of this embodiment can be made of aluminum die casting, for example, and has a connecting portion 141 that connects to the base member 13, a locking portion 142 that locks into the groove portion 47, and a lever portion 143.

The connecting portion 141 in this embodiment has a notched cylindrical shape with an opening 141b along the longitudinal direction of the cylinder with a hollow portion 141a formed throughout the entire longitudinal direction, and is configured so that its longitudinal dimension is the same as the longitudinal dimensions of the mounting portion 131, the connecting portion 134, and the plate-like portion 136 of the base member 13.

The hollow portion 141a accommodates the connecting portion 132 of the base member 13. In this embodiment, the hollow portion 141a is configured so that a small gap is created between the connecting portion 132 and the hollow portion 141a when the connecting portion 132 of the base member 13 is accommodated therein.

The opening 141b of the connecting part 141 is configured so that the dimension in a plane perpendicular to the longitudinal direction of the connecting part 141 is larger than the distance between both ends of the part where the connecting part 132 is connected to the cutout cylindrical part 135 in a plane perpendicular to the longitudinal direction of the base member 13 (the distance between both ends of the inner arc surface of the cutout cylindrical part 135), and is smaller than the diameter of the connecting part 132.

In this embodiment, as shown in FIG. 11, the latch member 14 can be provided on the base member 13 by inserting the connecting portion 132 from the longitudinal end of the hollow portion 141a while the cutout cylindrical portion 135 of the base member 13 is positioned within the opening range of the opening 141b of the connecting portion 141.

In particular, in this embodiment, since the connecting portion 141 is configured as described above, the latch member 14 can rotate with respect to the base member 13, with the connecting portion 132 of the base member 13 as a rotation axis, between a state in which one end 141c of the notched cylindrical shape of the connecting portion 141 contacts the notched tubular portion 135 of the base member 13 as shown in FIG. 6, and a state in which the other end 141d of the notched cylindrical shape of the connecting portion 141 contacts the notched tubular portion 135 of the base member 13 as shown in FIG. 7. In addition, the connecting portion 132 is screwed to be described later, which prevents the connecting portion 132 from slipping out of the opening 141b, thereby preventing the latch member 14 from falling off the base member 13.

In the present embodiment, the connecting portion 141 has a notched cylindrical recess 141f formed on both longitudinal ends of the inner peripheral surface 141e that constitutes the hollow portion 141a. The notched cylindrical recess 141f is formed on the entire inner peripheral surface 141e in a plane perpendicular to the longitudinal direction of the latch member 14. The dimension of each of the notched cylindrical recesses 141f in the longitudinal direction of the latch member 14 is formed to be equal to the distance between one end of the mounting portion 131 of the base member 13 and one end of the connecting portion 132 in the longitudinal direction of the base member 13. Therefore, the distance between the two notched cylindrical recesses 141f is equal to the longitudinal length of the connecting portion 132.

By forming such a cutout cylindrical recess 141f, a step 141g is formed on the inner circumferential surface 141e. This step 141g is flush with both longitudinal ends of the connecting portion 132 when the latch member 14 is provided on the base member 13. In particular, in this embodiment, the cutout cylindrical recess 141f is formed so that the thickness h of the step 141g is the same as the thickness H of the cutout cylindrical portion 135 of the base member 13.

As shown in Fig. 11, in this embodiment, the notched cylindrical portion 135 and the step portion 141g have outer arc surfaces formed by the arc surfaces of the same circle, and the inner arc surfaces formed by the arc surfaces of approximately the same circle, and are located on approximately the same annulus. Therefore, in this embodiment, the notched cylindrical portion 135, the step portion 141g, and the connecting portion 132 serve as seats, and the latch member 14 is screwed to the base member 13 from both longitudinal sides using the screw holes 132a.

The locking portion 142 in this embodiment is connected to the connecting portion 141 by a plate-shaped portion 144. When one end 141c of the notched cylindrical shape of the connecting portion 141 shown in FIG. 6 is in contact with the notched tubular portion 135 of the base member 13, the locking portion 142 is locked in the groove portion 47 of the lower frame 4. When the other end 141d of the notched cylindrical shape of the connecting portion 141 shown in FIG. 7 is in contact with the notched tubular portion 135 of the base member 13, the locking portion 142 is located outside the groove portion 47 and is not locked in the groove portion 47.

The lever portion 143 extends in a direction away from the rotation axis direction of the latch member 14, and in this embodiment, is formed on the outer periphery of the connecting portion 141. In this specification, the lever portion 143 extends in a direction away from the rotation axis direction means that in a cross section perpendicular to the rotation axis direction, the lever portion has a portion farther away from the rotation axis than one end of the lever portion 143 on the rotation axis side. In this embodiment, the lever portion 143 is formed so that the angle with the plate-shaped portion 144 is 90 degrees or more and less than 180 degrees in a plane perpendicular to the longitudinal direction of the latch member 14. The indoor end of the lever portion 143 is formed in a cylindrical shape, and both longitudinal ends of the lever portion 143 are configured to be located longitudinally outboard of both longitudinal ends of the plate-shaped portion 144.

As shown in Figure 1, the storage box 6 is made up of a main body 60 and a base material 61 that serves as a storage box reinforcement material to which the main body 60 is attached. The main body 60 houses a drum 62 to which the base end edge of the screen 5 is attached. The drum 62 winds up and unwinds the screen 5 and is equipped with a mechanism that allows it to temporarily stop at any vertical position during the process.

The base material 61 is made of steel and is thick, which increases the rigidity of the storage box 6.

In consideration of the possibility of a gap being formed between the box 6 and the inner peripheral surface 7a in the event of a fire, a storage section may be formed where the main body 60 contacts the inner peripheral surface 7a, and a heating foam material may be placed inside the storage section.

The fire opening and closing device 1 of this embodiment is equipped with a screen tightening mechanism including a base member 13 provided at the lower end of the screen 5 and a latch member 14 rotatably provided on the base member 13, and this latch member 14 is formed with a lever portion 143 extending in a direction away from the rotation axis direction of the latch member 14. Therefore, the latch member 14 is urged by the weight of the lever portion 143 into the groove portion 47 as the locked portion to which the locking portion 142 of the latch member 14 is locked. In addition, the lower frame reinforcement material 43 provided on the lower frame 4 suppresses deformation of the lower frame 4 (locked portion) in the event of a fire, thereby maintaining the locking of the latch member.

The right guide frame 2 (and left guide frame 3) has a guide frame reinforcement 23 provided on the inner circumference of the outer guide section 21, and the inner guide section 22 that houses the vertical side of the screen 5 is housed inside the outer guide section 21 so that a clearance is formed around all sides of it. Therefore, in the event of a fire, the guide frame reinforcement 23 suppresses deformation of the right guide frame 2 (and left guide frame 3), and the clearance formed around the inner guide section 22 also suppresses deformation of the inner guide section 22 due to high temperatures, etc., so that the vertical side of the screen 5 does not slip out of the right guide frame 2 (and left guide frame 3).

In addition, at the joint between the right guide frame 2 (and the left guide frame 3) and the lower frame 4, a space S is secured to absorb the thermal expansion of the frame reinforcement, where neither the guide frame reinforcement 23 nor the lower frame reinforcement 43 is provided. This prevents the guide frame reinforcement 23 and the lower frame reinforcement 43 from thermally expanding and coming into contact during a fire, and suppresses deformation of the right guide frame 2 (and the left guide frame 3) and the lower frame 4 due to thermal expansion of the frame reinforcement. Furthermore, a heating foam material 9 is disposed in the space S, and during a fire, the heating foam material 9 expands to close the space S where no frame reinforcement is provided. This prevents the screen 5 of the opening and closing device 1 from being turned up and releasing the closed state, so that during a fire, the flames are prevented from penetrating from the inside to the outside, and sufficient fire protection performance can be achieved. In addition, privacy can be sufficiently protected during peacetime.

In addition, because the latch member 14 is biased by the weight of the lever portion 143, there is no need to use a separate member such as a spring to bias the latch member 14. This allows the number of parts to be reduced and the life of the function for maintaining the closed state to be extended.

In the above embodiment, the lower frame 4 has a chamfered portion 48 between the upper surface 44a and the indoor side surface 45a. With this configuration, the locking portion 142 that abuts against the lower frame 4 when the screen 5 is closed can move along the chamfered portion 48 to the groove portion 47 formed in the indoor side portion 48. Therefore, the movement of the locking portion 142 is not hindered by contact with the upper surface 44a of the lower frame 4, so the locking portion 142 can be easily locked in the groove portion 47 as the locked portion by simply pressing the operating portion 133 downward to close the screen 5. When the screen 5 is in any vertical position, or when the bottom frame 11 is at the top and the operating portion 133 is in contact with the lower surface of the storage box 6, the operation can also be performed by holding the lever portion 143.

In addition, when storing the screen 5 in the storage box 6, the lock can be released and the screen can be stored to a certain extent simply by lifting (rotating) the lever portion 143 upward, making the storage operation of the screen 5 simple.

In the above embodiment, the notched cylindrical portion 135, the step portion 141g, and the connecting portion 132 are used as a seat to screw the latch member 14 to the base member 13. Also, in order to position the seat formed by the notched cylindrical portion 135, the step portion 141g, and the connecting portion 132 inside the longitudinal end portion of the hollow portion 141a, notched cylindrical recesses 141f are provided on both longitudinal ends of the latch member 14. With this configuration, there is no need to use a separate member as a seat, and the presence of the screws is made less visible.

In the fire opening and closing device 1 of this embodiment, the width direction end of the screen 5 is formed with a slip-out prevention portion 51 made of a thread made of a noncombustible material. Therefore, even if the slip-out prevention portion 51 that prevents the sheet-like screen 5 from slipping out of the right guide frame 2 and the left guide frame 3 is provided, and even if the slip-out prevention portion 51 overlaps radially on the width direction end side of the screen 5 in the rolled up state, it is possible to prevent the winding diameter on the width direction end side from increasing. Therefore, in the fire opening and closing device 1 of the above embodiment, it is possible to prevent the storage box 6 from becoming larger, the limitation of the place where it can be installed, and the deterioration of the aesthetics of the opening of the building, while suppressing the deterioration of the operability of the fire opening and closing device.

In addition, in the fire opening and closing device 1 of this embodiment, a metal plate 53 made of a non-combustible material is provided at the lower end of the screen 5. Such a plate 53 made of a non-combustible material not only functions to protect the lower end of the screen 5 from fire, but can also be used as a seat when screwing the bottom frame 11 to the screen 5. Therefore, in the fire opening and closing device 1 of the above embodiment, it is possible to simultaneously improve the fire protection function and simplify the mounting structure for mounting the bottom frame 11 to the screen 5.

Furthermore, in the fire protection opening and closing device 1 of this embodiment, a slip-out prevention portion 51 made of threads made of a non-combustible material is formed at the lower end of the screen 5. Therefore, it is possible to prevent the lower end of the sheet-like screen 5 from slipping out of the bottom frame 11.

Furthermore, in the fire protection opening and closing device 1 of this embodiment, the anti-pullout auxiliary parts 52 made of a non-combustible material are formed at the widthwise ends of the screen 5, so that even if the right guide frame 2 and the left guide frame 3 are deformed during a fire, or a large force is applied to the screen 5, such as a child pushing hard against the screen 5 under normal circumstances, the sheet-like screen 5 can be prevented from coming out of the right guide frame 2 and the left guide frame 3.

In the above embodiment, a stapler is used as the retaining auxiliary part 52, but as long as it is possible to prevent the screen 5 from coming out even when a large force is applied, the retaining auxiliary part 52 is not limited to a stapler. Also, as long as it is possible to prevent the screen 5 from coming out without providing the retaining auxiliary part 52, it is not necessary to provide the retaining auxiliary part 52.

In the above embodiment, only the anti-slip portion made of threads made of non-combustible material is formed as the anti-slip portion, but as long as the effects of the present invention are achieved, anti-slip portions other than the anti-slip portion made of threads made of non-combustible material may be formed.

In the above embodiment, the heated foaming material 9 as the guide frame lower end heated foaming material 9a is provided at the end of the first wall portion 21a on the lower frame 4 side, but the heated foaming material 9 can be provided in any member or position as long as it is in a space that faces the longitudinal end 43E of the lower frame reinforcement material 43 and the longitudinal end 23E of the guide frame reinforcement material 23.

In the above embodiment, the heating foam material 9 as the heating foam material 9b on the indoor/outdoor side of the lower frame is provided in the groove portion 47 of the lower frame 4, but the heating foam material 9 can be attached to any member or position between the lower frame and the outdoor side inner surface and/or indoor side inner surface of the left and right guide frames.

The present invention is not limited to the embodiment described above, and many modifications are possible within the technical concept of the present invention by a person of ordinary skill in the art. For example, in the above embodiment, the locking part is locked to the groove of the lower frame, but it may be locked to another part of the lower frame, or a locking part may be provided on the building.

The present invention provides a screen tightening mechanism that can prevent the screen of an opening and closing device from being lifted up and released from the closed state during both fire and peacetime, and an opening and closing device equipped with the mechanism.

1: Opening and closing device 2: Right guide frame 21: Outer guide portion 21a: First wall portion 21b: Second wall portion 21c: Third wall portion 21d: Pair of fourth wall portions 21e: Pair of outdoor-side protruding wall portions 21f: Bend portion 21g: Outdoor-side storage portion 21h: Pair of indoor-side protruding wall portions 21i: Bend portion 21j: Indoor-side storage portion 21k: Pair of protruding wall portions 21l: Opening 21m: Pair of protruding portions 22: Inner guide portion 22a: Slit 23: Guide frame reinforcement material 3: Left guide frame 4: Lower frame 4E: Longitudinal end portion 41: Bottom portion 41a: Back surface 41e: Pair of outdoor-side protruding wall portions 41f: Bend portion 41g: Outdoor-side storage portion 41h: Pair of indoor-side protruding wall portions 41i: Bend portion 41j: Indoor-side storage portion 42: Recess 43: Lower frame reinforcement member 43a: Bottom portion 43b: Pair of upright portions 43c: Pair of bent portions 43E: Longitudinal end portion 44: Upper portion 44a: Top surface 45: Indoor side portion 45a: Side surface 46: Outdoor side portion 46a: Side surface 47: Groove portion (retained portion)
48: Chamfered portion 5: Screen 5a: Vertical side 5b: Bottom end 51: Removal prevention portion 52: Removal prevention auxiliary portion 53: Plate 6: Storage box 60: Main body 61: Base material 62: Drum 7: Opening 7a: Inner peripheral surface 8: Frame 9: Heated foaming material 9a: Heated foaming material on lower end side of guide frame 9b: Heated foaming material on indoor/outdoor side of lower frame 9c: Heated foaming material on opening side of guide frame 9d: Heated foaming material on opening side of lower frame 10: Gap hiding material 11: Bottom frame 111: Indoor side member 111a: Opening 111b: Storage portion 112: Outdoor side member 12: Tightening mechanism 13: Base member 131: Mounting portion 131a: Screw hole 132: Connection portion 132a: Screw hole 133: Operation portion 133a: Upper surface 133b: Lower surface 134: Connection portion 134a: Recess 135: Notched cylindrical portion 136: Plate-shaped portion 14: Latch member 141: Connecting portion 141a: Hollow portion 141b: Opening 141c: One end 141d: Other end 141e: Inner peripheral surface 141f: Notched cylindrical recess 141g: Step portion 142: Locking portion 143: Lever portion H: Thickness h: Thickness

Claims (9)

A screen tightening mechanism that maintains a closed state by a screen that can be moved in the vertical direction,
A base member provided at a lower end of the screen; and
a latch member rotatably provided on the base member;
The latch member is formed with a lever portion extending in a direction away from the rotation axis direction of the latch member ,
the base member includes an operation unit that is operated when the screen is moved up and down,
A tightening mechanism characterized in that the upper surface of the operating unit is located above the upper surface of a bottom frame attached to the lower end of the screen . A left guide frame, a right guide frame and a bottom frame;
a screen whose width direction end is surrounded by the left guide frame and the right guide frame and which is wound and unwound along the left guide frame and the right guide frame;
A storage box for storing the screen;
a screen tightening mechanism including a base member provided at a lower end of the screen and a latch member rotatably provided on the base member,
The latch member is formed with a lever portion extending in a direction away from the rotation axis direction of the latch member ,
the base member includes an operation unit that is operated when the screen is moved up and down,
An opening and closing device characterized in that an upper surface of the operating unit is located above an upper surface of a bottom frame attached to the lower end of the screen . The opening and closing device according to claim 2, characterized in that the lower frame is formed with a latching portion to which the latch member is engaged when the screen is in the closed state. The opening and closing device according to claim 2 or 3, characterized in that the lower frame has a chamfered portion between the upper surface and the indoor side surface. The opening and closing device according to any one of claims 2 to 4, further comprising a lower frame reinforcement material that supports the lower frame from the inside. The opening and closing device according to any one of claims 2 to 5, further comprising a guide frame reinforcement material that supports the left and right guide frames from their insides. A guide frame reinforcing member that supports the left and right guide frames from their insides;
A lower frame reinforcing material that supports the lower frame from the inside thereof,
An opening and closing device as described in any one of claims 2 to 4, characterized in that a heat-foaming material is provided in the space between the longitudinal end of the lower frame reinforcement material and the longitudinal end of the guide frame reinforcement material. The opening and closing device according to claim 7, characterized in that the heated foaming material is provided on the lower end side of the guide frame in the longitudinal direction. The opening and closing device according to claim 7 or 8, characterized in that the heating foaming material is provided between the lower frame and the outdoor side inner surface and/or the indoor side inner surface of the left and right guide frames.

Images