Window opening and closing device

Abstract

To provide a window opening / closing device which can restrict a swing angle of a sash.SOLUTION: In a state where a restriction arm 7 for connecting a sash and a window frame and a connection part 91 are connected, a swing angle of the sash 5 is restricted to swing over a ventilation angle, and in a state where the connection is released, the sash 5 comes into a state of being able to swing over the ventilation angle. Thereby, in a window opening / closing device, in a state where the restriction arm 7 and the connection part 91 are connected, that is, in a state where the restriction arm 7 and a restriction unit 9 are connected, the maximum swing angle of the sash 5 is restricted to be equal to or less than the ventilation opening. Then, in a state where the connection is released, the sash 5 comes into a state of being able to swing over the ventilation angle, and by the elastic force of a spring, the restriction arm 7 automatically returns to a storage position.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present disclosure relates to a window opening and closing device capable of regulating the swing angle of a sliding screen. [Background technology]

[0002] For example, the window opening and closing device described in Patent Document 1 uses an arm member and a connecting arm to regulate the swing angle of a shoji screen. The arm member is a rail-shaped member fixed to the bottom frame of the shoji screen. One end of the connecting arm is rotatably connected to the window frame, and the other end is rotatably connected to the arm member. The connecting portion between the connecting arm and the arm member is slidable relative to the arm member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-197590 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the window opening and closing device according to Patent Document 1, the swing angle of the door is restricted by restricting the sliding of the connecting part. The present disclosure discloses an example of a window opening and closing device capable of restricting the swing angle of the door with a configuration different from that of the window opening and closing device. [Means for solving the problem]

[0005] A window opening and closing device may, for example, include a window frame (3) that frames a window opening, a shoji (5) that is swingably connected to the window frame (3) and that swings and displaces between a closed state in which the window opening is closed and an open state in which the window opening is open, a regulating arm (7) that is swingably connected to the first member (3) when one of the window frame (3) and the shoji (5) is a first member (3) and the other is a second member (5), a regulating unit (9) that is provided on the second member (5) and has a connecting portion (91) that is connected to the regulating arm (7), the connecting portion (91) being displaceable between a connected position and a released position in which the connection is released, and a regulating arm (7). The device is provided with a spring (11) that exerts an elastic force to rotate the arm (7), and when the position of the regulating arm (7) when the regulating arm (7) is in the stored position when the sash screen (5) is in the closed state with the regulating arm (7) connected to the connecting part (91), the spring (11) exerts an elastic force to rotate the regulating arm (7) toward the stored position, and further, when the regulating arm (7) is connected to the connecting part (91), the swing angle (θ) of the sash screen (5) is restricted from swinging beyond a predetermined angle (hereinafter referred to as the ventilation angle), and when the connection is released, it is desirable that the sash screen (5) is capable of swinging beyond the ventilation angle.

[0006] As a result, in this window opening and closing device, the swing angle is regulated in a configuration different from that of the window opening and closing device described in Patent Document 1.

[0007] That is, when the restricting arm (7) and the connecting portion (91) are connected, i.e., when the restricting arm (7) and the restricting unit (9) are connected, the maximum swing angle of the screen (5) is restricted to be equal to or less than the ventilation opening degree. When the connection is released, the screen (5) is allowed to swing beyond the ventilation angle, and the restricting arm (7) automatically returns to the stored position due to the elastic force of the spring (11).

[0008] Incidentally, the symbols in the above parentheses are examples showing the corresponding relationship with the specific configurations etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations etc. shown by the symbols in the above parentheses. [Brief description of the drawings]

[0009] [Figure 1] 1 is a diagram showing a window opening and closing device according to a first embodiment. [Diagram 2] 1 is a diagram showing a window opening and closing device according to a first embodiment. [Diagram 3] 1 is a diagram showing a window opening and closing device according to a first embodiment. [Figure 4] FIG. 4 is an exploded view of the regulation unit according to the first embodiment. [Diagram 5] 4A to 4C are diagrams illustrating a structure of a regulation unit according to the first embodiment. [Figure 6] 4A to 4C are diagrams illustrating a structure of a regulation unit according to the first embodiment. [Figure 7] 4A to 4C are diagrams illustrating a structure of a regulation unit according to the first embodiment. [Figure 8] 1 is a diagram showing a window opening and closing device according to a first embodiment. [Figure 9] 1 is a diagram showing a window opening and closing device according to a first embodiment. [Figure 10] 1 is a diagram showing a structure of a window opening and closing device according to a first embodiment. [Figure 11] 4A to 4C are diagrams illustrating the operation of the window opening and closing device according to the first embodiment. [Figure 12] 4A to 4C are diagrams illustrating the operation of the window opening and closing device according to the first embodiment. [Figure 13] 4A to 4C are diagrams illustrating the operation of the window opening and closing device according to the first embodiment. [Figure 14] 4A to 4C are diagrams illustrating the operation of the window opening and closing device according to the first embodiment. [Figure 15] 4A to 4C are diagrams illustrating the operation of the window opening and closing device according to the first embodiment. [Figure 16] 4A to 4C are diagrams illustrating the operation of the window opening and closing device according to the first embodiment. [Figure 17] 4A to 4C are diagrams illustrating the operation of the window opening and closing device according to the first embodiment. [Figure 18] 4A to 4C are diagrams illustrating the operation of the window opening and closing device according to the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The following "embodiments of the invention" are examples of embodiments that fall within the technical scope of the present disclosure. In other words, the invention-specific matters described in the claims are not limited to the specific configurations and structures shown in the following embodiments.

[0011] In addition, arrows and diagonal lines indicating directions in each figure are provided to facilitate understanding of the relationship between the figures and the shapes of each member or part. Therefore, the invention shown in this disclosure is not limited to the directions indicated in each figure. Diagonal lines do not necessarily indicate cross-sectional views.

[0012] At least one of each of the components or parts described with a reference symbol is provided, unless otherwise specified by "one". In other words, unless otherwise specified by "one", the component may be provided in two or more. The window opening and closing device shown in the present disclosure includes at least the components such as the components or parts described with a reference symbol, as well as the structural parts shown in the drawings.

[0013] (First embodiment) <1. Overview of window opening and closing device> In this embodiment, an example of a window opening and closing device according to the present disclosure is applied to a window opening and closing device 1 used in a relatively large building such as a building, as shown in Fig. 1. In addition to a window frame 3 and a paper screen 5, the window opening and closing device 1 includes at least a restricting arm 7, a restricting unit 9, and a spring 11 as shown in Fig. 2.

[0014] <Window frames, Shoji screens> The window frame 3 is a frame that frames a window opening provided in a building, as shown in Fig. 1. The window frame 3 according to this embodiment is configured with a rectangular frame made of metal (light metal such as aluminum).

[0015] The shoji screen 5 is swingably connected to the window frame 3. The shoji screen 5 swings between a closed state in which the window opening is closed and an open state in which the window opening is open. The shoji screen 5 according to this embodiment is swingably connected to one horizontal end of the window frame 3, and swings toward the room relative to the window frame 3 to be in the open state.

[0016] <Restraining arm, spring> 2, the regulating arm 7 is a member that connects either one of the window frame 3 or the shoji screen 5 to the regulating unit 9. The regulating unit 9 according to this embodiment is housed within the lower frame 5A of the shoji screen 5.

[0017] One end of the regulating arm 7 according to this embodiment is swingably connected to the lower frame 3A of the window frame 3 via a bracket 12. The spring 11 exerts an elastic force that rotates the regulating arm 7 around the one end.

[0018] Specifically, the spring 11 exerts an elastic force Fs that rotates the regulating arm 7 toward the storage position. The spring 11 according to this embodiment is a torsion coil spring in which a coil portion is disposed on the oscillation shaft 7A of the regulating arm 7.

[0019] The stored position is the position of the regulating arm 7 shown in Fig. 3. In other words, the stored position is the position of the regulating arm 7 when the regulating arm 7 and the regulating unit 9 are connected to each other and the sliding screen 5 is in the closed state.

[0020] In this embodiment, when the regulating arm 7 is in the stored position, the regulating arm 7 is located between the lower frame 3A and the lower frame 5A with its longitudinal direction being approximately parallel to the lower frame 3A of the window frame 3. The swing shaft 7A is fixed to the regulating arm 7 by press-fitting, welding, or the like.

[0021] The bracket 12 is provided with a shaft hole (not shown) and a stopper 12A. The shaft hole is a through hole or a recess into which the swing shaft 7A is rotatably inserted. The stopper 12A prevents the restricting arm 7 from rotating beyond the storage position due to the elastic force of the spring 11.

[0022] <Regulatory unit> The regulating unit 9 is a device for switching between a connected state in which the regulating arm 7 and the screen 5 are connected and a released state in which the connection is released.

[0023] In the connected state, the swing angle θ (see FIG. 1) of the screen 5 is restricted from swinging beyond a predetermined angle (hereinafter referred to as the ventilation angle). In the released state, the screen 5 is allowed to swing beyond the ventilation angle.

[0024] In this embodiment, when the window opening / closing device 1 is in the released state, the screen 5 is in a state in which it can be opened and closed freely. In other words, the screen 5 can be opened further from the ventilation angle, or closed from the ventilation angle.

[0025] Incidentally, as is clear from the above definition, the ventilation angle is not limited to a swing angle for performing ventilation, but refers to a predetermined swing angle θ. In other words, the ventilation angle is not limited to a swing angle θ suitable for ventilation.

[0026] <2. Details of the control unit and control arm> <2.1 Regulatory Unit> As shown in FIG. 4, the regulation unit 9 according to this embodiment at least includes a connection portion 91, a first operation portion 92, a second operation portion 93, a third operation portion 94, a housing 95, a cover 96, and the like.

[0027] <Connection part> The connecting portion 91 is a pin-shaped member that is displaceable between a connecting position and a releasing position. The connecting position is a position where the connecting portion 91 is connectable to the regulating arm 7, as shown in Fig. 5. The releasing position is a position where the connection is released, as shown in Fig. 6.

[0028] 5, the connecting portion 91 is displaceably inserted into the insertion hole 95A. The insertion hole 95A is a hole provided in the housing 95, and is a hole that penetrates the housing 95 in the swing axis direction of the shoji screen 5 (in the vertical direction in this embodiment).

[0029] The connecting portion 91 according to this embodiment is a stepped pin having a large diameter portion 91A and a small diameter portion 91B. The small diameter portion 91B has a smaller diameter than the large diameter portion 91A. At least the large diameter portion 91A is in sliding contact with the inner circumferential surface of the insertion hole 95A.

[0030] The small diameter portion 91B is a portion that fits into the guide hole 71 provided in the regulating arm 7 when in the connected state. In other words, when the connecting portion 91 is in the connected position and the small diameter portion 91B of the connecting portion 91 fits into the guide hole 71, the regulating arm 7 and the regulating unit 9 are in the connected state.

[0031] A pressure spring 91C is provided on the large diameter portion 91A side of the connecting portion 91. The pressure spring 91C exerts an elastic force that displaces the connecting portion 91 toward the connecting position (downward in this embodiment). Therefore, the connecting portion 91 is in the connecting position when no other external force is acting on it.

[0032] When the connecting portion 91 is in the connecting position, the large diameter portion 91A is engaged with the step portion 95B of the insertion hole 95A as shown in Fig. 5. This prevents the connecting portion 91 from moving beyond the connecting position toward the regulating arm 7.

[0033] 7, the large diameter portion 91A is provided with at least one (two in this embodiment) protrusion 91D, 91E protruding in the radial direction. Each of the protrusions 91D, 91E is slidably fitted into a groove 95C, 95D provided in the housing 95.

[0034] The grooves 95C and 95D extend in the penetration direction of the insertion hole 95A (in the present embodiment, the vertical direction). The protrusions 91D and 91E come into sliding contact with the inner walls of the corresponding grooves 95C and 95D. Therefore, the connecting portion 91 is displaced in the penetration direction without rotating around the penetration direction.

[0035] The insertion hole 95A on the pressure spring 91C side is closed by a lid portion 96A. The lid portion 96A is provided on a cover 96 as shown in Fig. 4. A main body portion 96B of the cover 96 closes an opening for incorporating the second operating portion 93 and the third operating portion 94 into the housing 95.

[0036] 8, an inclined surface 91F is provided at the tip of the connecting portion 91, that is, on the lower end side of the small diameter portion 91B. The inclined surface 91F is inclined with respect to the axis of the connecting portion 91, that is, with respect to the penetration direction.

[0037] Specifically, the inclined surface 91F is inclined so that when a force in a direction to close the shoji screen 5 acts on the connecting portion 91 while the connecting portion 91 is in contact with the end of the regulating arm 7, a force (hereinafter referred to as the sinking force F4) in a direction to sink the connecting portion 91 into the insertion hole 95A is generated on the connecting portion 91.

[0038] The inclined surface 91F is provided at the tip of the connecting portion 91, at a portion that comes into contact with the regulating arm 7 when the unlocked door 5 is closed. In other words, the inclined surface 91F is provided at a portion of the tip of the connecting portion 91 that faces the storage position in the open state (see FIG. 9).

[0039] Incidentally, an inclined surface 7B (see FIG. 8) is provided at the end of the regulating arm 7, where the inclined surface 91F comes into contact when the unlocked door 5 is closed. The inclined surfaces 7B are inclined so as to be substantially parallel to each other when the inclined surfaces 91F come into contact.

[0040] <1st operation section> 10, the first operation part 92 is a part that is operated by a user from the inside of the door 5 when displacing the connecting part 91 to the release position. When a specific operation key 92A is inserted into the restriction unit 9, the connecting part 91 is displaced to the release position.

[0041] Specifically, the first operating portion 92 (hereinafter also referred to as the operating inclined surface 92) is inclined so that when a force acts from a direction perpendicular to the displacement direction of the connecting portion 91 (in this embodiment, the up-down direction), a force (hereinafter referred to as the release force) is generated that displaces the connecting portion 91 to the release position.

[0042] Therefore, when a user inserts the operation key 92A into the restriction unit 9 and applies a pressing force in the insertion direction to the operation key 92A, the pressing force of the operation key 92A in contact with the operation inclined surface 92 generates a release force.

[0043] When the operation key 92A is inserted (see FIG. 10), the coupling portion 91 is held in the release position. When the operation key 92A is removed, the coupling portion 91 returns to the coupled position due to the elastic force of the pressure spring 91C.

[0044] <Second operation section 93> The second operating part 93 (hereinafter also referred to as the connection operating cam 93) is a part that is operated by a user from the outside of the door 5 when displacing the connection part 91 to the release position. That is, when the user rotates the handle 93A (see FIG. 4), the connection operating cam 93 rotates and displaces between the position shown in FIG. 11 and the position shown in FIG. 12.

[0045] 11, the connection operating cam 93 is not in contact with the connecting portion 91. Therefore, the connecting portion 91 is in the connecting position due to the elastic force of the pressure spring 91C.

[0046] When the connection operating cam 93 rotates from the position shown in FIG. 11 to the position shown in FIG. 12, the connection operating cam 93 comes into contact with the protrusion 91E, and displaces the connection portion 91 to the release position while deforming the pressure spring 91C.

[0047] As shown in Fig. 4, the shaft 93B of the handle 93A is rotatably supported by the housing 95 via a bearing plate 93C. Incidentally, the handle 93A is intended to be used in an emergency to open the sliding screen 5 from the outside of the room.

[0048] For this reason, bearing portion 93D provided on bearing plate 93C is configured with a sliding bearing that generates a relatively large rotational resistance, so that handle 93A will not rotate even if a user accidentally touches handle 93A.

[0049] <Third operation section and control arm> 9, the guide hole 71 of the regulating arm 7 is configured as an elongated through hole or groove into which the connecting portion 91 can be fitted when the connecting portion 91 is in the connected position. The connecting portion 91 fitted into the guide hole 71 can be displaced along the extension direction of the guide hole 71.

[0050] Specifically, as shown in Figures 13 to 15, when the swing angle θ of the shoji screen 5 changes with the connecting portion 91 fitted into the guide hole 71, the connecting portion 91 displaces within the guide hole 71 in conjunction with the change in the swing angle θ.

[0051] 13, a recess 71A recessed in the reverse direction is provided at a portion on the tip side of the extension direction of the guide hole 71 corresponding to the tip side of the regulating arm 7. The reverse direction refers to the direction opposite to the direction in which the spring 11 rotates the regulating arm 7 (the direction of the arrow Fs).

[0052] In other words, the recess 71A is provided at a portion of the guide hole 71 where the connecting portion 91 is located when the swing angle θ becomes the ventilation angle, and is a depression that is recessed in the opposite direction to the elastic force of the spring 11, i.e., in the reverse direction.

[0053] The recess 71A is configured such that, with the connecting portion 91 fitted in the recess 71A, when the force F2 or F3 for rotating the screen 5 acts on the screen 5, the connecting portion 91 is displaced in the reverse direction. Therefore, when the connecting portion 91 fits into the recess 71A, the rocking of the screen 5 is restricted.

[0054] The third operating part 94 (hereinafter, also referred to as the close operating cam 94) is operated by the user when displacing the connecting part 91 (see FIG. 9) fitted in the recess 71A from the recess 71A (see FIG. 13). The close operating cam 94 is a part that is operated from the inside of the room with respect to the shoji screen 5 (see FIG. 4).

[0055] That is, when the handle 94A (see FIG. 4) is rotated by the user, the closing operation cam 94 rotates and displaces between a position spaced apart from the regulating arm 7 (see FIG. 16) and a position in contact with the regulating arm 7 (see FIG. 17).

[0056] When the closing operation cam 94 and the regulating arm 7 are in contact with each other, the closing operation cam 94 displaces the regulating arm 7 in the reverse direction as shown in Fig. 13. As a result, the connecting portion 91 that was fitted into the recessed portion 71A (see Fig. 9) is released from the recessed portion 71A (see Fig. 13).

[0057] That is, for example, when a user performs an operation to rotate the handle 94A rightward, the closing operation cam 94 comes into contact with the regulating arm 7 and applies a force in the reverse direction (F1 in FIG. 13) to the regulating arm 7. At this time, since the connecting portion 91 is immobile, the regulating arm 7 rotates in the reverse direction, and the connecting portion 91 comes out of the recessed portion 71A.

[0058] The closing operation cam 94 is held in a position where it does not come into contact with the restriction arm 7 by the elastic force of a spring 94B (see FIG. 4). In other words, the closing operation cam 94 is displaced to a position where it can come into contact with the restriction arm 7 only when the user rotates the handle 94A.

[0059] <3. Operation and Features of the Window Opening and Closing Device According to the Present Embodiment> <3.1 Operation when the shoji screen opens> When the screen 5 is closed, the regulating arm 7 is in the stored position, and the connecting part 91 fits into the guide hole 71 (see FIG. 15). When the screen 5 is opened from this state, the connecting part 91 moves in the guide hole 71 in the order of FIG. 14 → FIG. 13.

[0060] When the connecting part 91 reaches the position shown in Fig. 13, if a force (force F2 in Fig. 9) acts in a direction to open the screen 5, the connecting part 91 is displaced in the opposite direction as described above, and the connecting part 91 fits into the recess 71A (see Fig. 9). Therefore, the swing angle θ of the screen 5 is maintained at the ventilation angle.

[0061] <3.2 Operation when the shoji screen is closed> When the user rotates the handle 94A while the connecting portion 91 is fitted into the recess 71A (see FIG. 9), the closing operation cam 94 presses the regulating arm 7 (see FIG. 13), causing the regulating arm 7 to rotate in the reverse direction and disengage the connecting portion 91 from the recess 71A.

[0062] In this state, when the user swings the screen 5 in the direction of the closed state (the direction of force F3 in Fig. 9), the connecting part 91 moves in the guide hole 71 in the order of Fig. 14 → Fig. 15, and the screen 5 is closed. In this embodiment, the screen 5 cannot be swung unless the handle 94A is operated.

[0063] <3.3 Connected and disconnected states> When the operation key 92A is inserted or the handle 93A is rotated while the connecting portion 91 is fitted in the guide hole 71, the connecting portion 91 is displaced from the connecting position to the release position, thereby releasing the connection between the connecting portion 91 and the regulating arm 7.

[0064] Therefore, in the released state, the connection between the regulating arm 7 and the regulating unit 9 is released, so that the screen 5 can swing beyond the ventilation angle. At the same time, the regulating arm 7 automatically returns to the stored position by the elastic force of the spring 11.

[0065] In addition, in the released state, when the operation key 92A is removed or the handle 93A is rotated in the reverse direction, the elastic force of the pressure spring 91C returns the coupling portion 91 to the coupled position.

[0066] When the door 5 is closed in the released state, as shown in Fig. 18, the inclined surface 91F of the connecting part 91 comes into contact with the end (inclined surface 7B) of the regulating arm 7. In this state, when the door 5 is further closed, a sinking force F4 acts on the connecting part 91 (see Fig. 8), so that the connecting part 91 is displaced from the connected position to the released position.

[0067] When the screen 5 is displaced to the closed state, the connecting portion 91 reaches the guide hole 71, and the connecting portion 91 returns to the connected position by the elastic force of the pressure spring 91C. As a result, in this embodiment, even if the connection between the screen 5 and the regulating arm 7 is released, when the screen 5 is closed, the screen 5 and the regulating arm 7 are automatically connected to each other.

[0068] In addition, when the operating key 92A is inserted, or when the handle 93A is rotated while the screen 5 is in the closed position, the operating key 92A is removed, or when the handle 93A is rotated in the opposite direction, the screen 5 and the regulating arm 7 are automatically connected.

[0069] (Other embodiments) In the above-described embodiment, the regulating unit 9 is disposed on the shoji screen 5, and the swing center of the regulating arm 7 is provided on the window frame 3. However, the present disclosure is not limited to this. That is, the present disclosure may be configured, for example, such that the regulating unit 9 is disposed on the window frame 3, and the swing center of the regulating arm 7 is provided on the shoji screen 5.

[0070] In the above-described embodiment, when the door 5 is closed, the door 5 (the regulating unit 9) and the regulating arm 7 are automatically connected to each other. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that the regulating unit 9 and the regulating arm 7 are connected to each other when they are manually operated, for example.

[0071] In the above-described embodiment, the first operation unit 92 and the second operation unit 93 are provided. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that, for example, only the first operation unit 92 or the second operation unit 93 is provided.

[0072] The first operation unit 92 according to the embodiment described above is configured to be operated by the operation key 92A. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that the first operation unit 92 can also be operated by a handle, for example.

[0073] In the above-described embodiment, the tip side of the connecting portion 91 and the end portion of the regulating arm 7 are provided with inclined surfaces. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that, for example, all or any one of the inclined surfaces is eliminated.

[0074] The restriction unit 9 according to the embodiment described above is arranged inside the sliding screen 5, and is configured so that the restriction unit 9 is not visible from the outside. However, the present disclosure is not limited to this. That is, the present disclosure may be configured so that the restriction unit 9 is arranged in a position where it can be seen, for example.

[0075] In the above-described embodiment, the function of disengaging the coupling portion 91 fitted in the recess 71A from the recess 71A (hereinafter, referred to as disengagement function) is provided. However, the present disclosure is not limited to this.

[0076] That is, the disclosure may be, for example, a configuration in which the recess 71A is eliminated, or a configuration in which the detachment function is eliminated. In the configuration in which the detachment function is eliminated, the user needs to manually detach the coupling part 91 that is fitted into the recess 71A.

[0077] Furthermore, the present disclosure is not limited to the above-mentioned embodiments as long as it is consistent with the gist of the disclosure described in the above-mentioned embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-mentioned embodiments are combined, or a configuration in which any of the components illustrated or the components described with reference numerals in the above-mentioned embodiments are eliminated. [Explanation of symbols]

[0078] 1... Window opening and closing device 3... Window frame 5... Shoji screen 7... Control arm 9... Regulating unit 12... Bracket 71... Guide hole 71A... Recess 91... Connection portion 92... First operation portion (operation inclined surface) 92A... Operation key 93... Second operation part (connection operation cam) 93A... Handle 94… Third operating part (closing operation cam) 94A… Handle 95… Housing 95A… Insertion hole

Claims

1. A window frame that frames the window opening; A shoji screen that is swingably connected to the window frame and can be swingably displaced between a closed state in which the window opening is closed and an open state in which the window opening is opened; When one of the window frame and the screen is a first member and the other is a second member, a regulating arm is swingably connected to the first member; a restriction unit provided on the second member and having a connecting portion connected to the restriction arm, the connecting portion being displaceable between a connected position and a released position where the connection is released; a spring that exerts an elastic force to rotate the restriction arm, When the position of the restriction arm when the shutter is in the closed state with the restriction arm and the connecting portion connected to each other is set to a storage position, the spring exerts an elastic force that rotates the restriction arm toward the storage position, When the restricting arm and the connecting portion are connected, the swing angle of the screen is restricted from swinging beyond a predetermined angle (hereinafter referred to as the ventilation angle), and when the connection is released, the screen is allowed to swing beyond the ventilation angle, The connecting portion is a pin-shaped member, the restricting arm is provided with a guide hole into which the connecting portion fits when the connecting portion is in the connecting position, when a direction opposite to a direction in which the spring rotates the regulating arm is defined as a reverse direction, a recess is provided in a portion on a tip side of an extension direction of the guide hole and corresponding to a tip side of the regulating arm, the recess being recessed in the reverse direction, Furthermore, in the window opening and closing device, a sloped surface is provided at the tip side of the pin-shaped connecting portion, which faces the storage position side in the open state, and is inclined with respect to the axis of the connecting portion.

2. The window opening and closing device according to claim 1 , wherein the regulating unit sets the connecting portion in the released position to the connected position at least when the screen is in the closed state.

3. The regulating unit is housed within a frame portion of the shoji screen, A window opening and closing device as described in claim 1 or 2, further comprising two operating units for displacing the connecting unit to the release position, a first operating unit that can be operated from the inside of the screen and a second operating unit that can be operated from the outside of the screen.

4. The first operation unit can be operated by a specific operation key, The window opening and closing device according to claim 3 , wherein the second operating portion is configured as a grippable operating handle.

5. 5. The window opening and closing device according to claim 1, further comprising a third operating portion for displacing the regulating arm in the reverse direction.

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