Casement window opening limit stopper device

Abstract

To provide a stopper device for limiting an aperture, capable of preventing a fall accident, easily switching between a limit mode and a limit release mode, and being used in a casement window serving as an emergency entrance.SOLUTION: A stopper device comprises an arm member 1, a shaft unit 2, an internal switching unit 3 and an external switching unit 4. The arm member 1 includes a swinging arm 13. The shaft unit 2 consists of a switching mechanism that switches between the limit mode and the limit release mode in accordance with the engagement / disengagement of a protruding / receding engaging shaft 22 with / from the arm 13, and includes an internal operated part 23 operated from the internal switching unit 3 and an external operated part 24 operated from the external switching unit 4. The internal switching unit 3 includes an internal operation piece 32 and an internal switching knob 33, and the external switching unit 4 includes an external operation piece 42 and an external switching knob 43. Even in the limit mode where the internal operation piece 32 is in a limit position, the mode can be switched to the limit release mode by the external operation piece 42.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] This invention relates to an opening limiting stopper device that has the function of limiting the opening of a sliding door of a casement window to half-open and the function of allowing it to be fully opened. [Background technology]

[0002] Casement windows, which have a sliding screen that swings open and close, are commonly used in office buildings, hotels, etc. These casement windows are normally equipped with an opening limiting stopper device that limits the opening to a half-open position sufficient to allow ventilation while preventing falls. In particular, casement windows that serve as emergency entrances in the event of a fire use an opening limiting stopper device that allows the screen to be fully opened from the outside.

[0003] The following Patent Document 1 describes an opening limiting stopper device that has the function of allowing a shoji screen to be fully opened, and that can unlock a locked shoji screen and allow it to be fully opened simply by operating an external handle located on the outside of the screen in order to carry out rescue operations in the event of a fire.

[0004] However, this opening limiting stopper device has the disadvantage that the shoji screen can only be opened halfway from the inside of the room, and cannot be fully opened from the inside of the room when cleaning.

[0005] Furthermore, the following Patent Document 2 describes an opening limiting stopper device in which an arm mounting part that limits the swing range of the shoji screen is freely raised and lowered on the vertical frame around the window, and which switches between a limiting mode in which the opening of the shoji screen is limited to half-open and a limit release mode in which it can be fully opened as the arm mounting part, which has a switching knob and a release knob on the inside and outside of the room, is raised and lowered.

[0006] However, with this opening limit stopper device, even if the shoji screen is fully opened in the limit release mode and then closed, it will remain in the limit release mode unless it is returned to the limit mode again. Therefore, there is a risk that careless operation will cause the shoji screen to unintentionally open fully, resulting in a fall accident.

[0007] Furthermore, the following Patent Document 3 describes an opening limiting stopper device in which, when the knob of the internal switching unit attached to the inside of the shoji screen is slid, an engaging shaft appears and disappears from the edge of the shoji screen, and as the arm that swings relative to the frame engages and disengages with the engaging shaft, the device switches between a restricted mode in which the opening of the shoji screen is limited to half-open, and an unrestricted mode in which it can be fully opened, and the device is equipped with a lock on the internal switching unit that prevents the knob from sliding and locks it in the restricted mode.

[0008] However, this opening limiting stopper device cannot be switched to the restriction release mode from outside the room when it is locked in the restriction mode by the lock on the internal switching unit, and therefore cannot be used for casement windows that serve as emergency entrances in the event of a fire. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 2017-179830 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-256601 [Patent Document 3] Japanese Patent Application Laid-Open No. 2008-261152 Summary of the Invention [Problem to be solved by the invention]

[0010] As such, the above prior art documents do not disclose an opening limiting stopper device for casement windows that is safe and convenient, and that combines the functions of automatically returning to the limiting mode to prevent falls, switching to the limit release mode from inside the room for convenience in cleaning, etc., and switching to the limit release mode from outside the room for rescue operations in the event of a fire.

[0011] Therefore, an object of the present invention is to provide an opening limiting stopper device that can prevent falls, can easily switch between limit mode and no limit mode, and can be used for casement windows that serve as emergency entrances. [Means for solving the problem]

[0012] In order to solve the above problems, this invention is a device that comprises an arm member attached to a frame corresponding to the door edge of a shoji screen, an axis unit built into the door frame of the door edge of the shoji screen, an internal switching unit attached to the indoor side of the door frame, and an external switching unit attached to the outdoor side of the door frame. the arm member includes an arm that swings around an axis on the side attached to the frame, The shaft unit constitutes a switching mechanism that switches between a restricted mode and a released mode in response to the engagement and disengagement of the arm with an engagement shaft that appears and disappears from the edge of the shoji door, and includes an internal operated part that is operated from the internal switching unit and an external operated part that is operated from the external switching unit, the internal switching unit includes an internal operating piece and an internal switching knob that operate the internal operated portion in accordance with movement between a restricting position and a releasing position, the external switching unit includes an external operating piece and an external switching knob that operate the external operated portion in accordance with movement between a restricted position and a released position, Even in the restricted mode in which the internal operating piece of the internal switching unit is in the restricted position, the mode can be switched to the restricted release mode by the external operating piece of the external switching unit.

[0013] The arm is provided with an inclined guide surface along the outer edge of the room, When closing a shoji screen that has been fully open in the restriction release mode, the engagement shaft that protrudes due to the biasing force slides into contact with the inclined guide surface of the arm and sinks against the biasing force, and then protrudes to engage with the arm, automatically returning to the restriction mode.

[0014] Furthermore, the internal operating piece and / or internal switching knob of the internal switching unit, and the external operating piece and / or external switching knob of the external switching unit are biased in a direction returning from the restriction release position to the restriction position.

[0015] In addition, one of the internal operated part and the external operated part of the shaft unit is located on the axis of the engagement shaft, and the other is located away from the axis of the engagement shaft so as to branch off from it, The engaging shaft, the internal operated part and the external operated part move as a unit relative to the base of the shaft unit which is fixed to the shoji screen.

[0016] The internal switching unit is provided with a lock that prevents movement of the internal operating piece and / or the internal switching knob, thereby locking it in the restricted mode. [Effects of the Invention]

[0017] In the opening limiting stopper device for a hinged window of this invention, even if the internal switching unit is in a limiting mode in which the opening of the shoji screen is limited to half-open from the inside of the room, by operating the external switching knob of the external switching unit, the device can be switched to a limit-release mode in which the shoji screen can be fully opened.

[0018] This prevents falls while also enabling the opening of the shoji screen from the outside in the event of a fire, and it can also be used for casement windows that serve as emergency entrances.

[0019] Furthermore, when closing a shoji screen that has been fully opened in the unrestricted mode after cleaning work, etc., it automatically returns to the restricted mode, which restricts the opening of the shoji screen to half-open, preventing a situation in which the shoji screen is fully opened due to forgetting to switch to the restricted mode, resulting in the risk of a fall accident. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a view showing an attachment state of an opening limiting stopper device to a casement window from the indoor side according to an embodiment of the present invention; [Figure 2] A diagram showing the installation state of the above casement window from the outside of the room. [Figure 3] FIG. 2 is a diagram showing the overall configuration of the opening limiting stopper device in a limiting mode; [Figure 4] FIG. 10 shows the arm member of the same. [Figure 5] Figure showing the shaft unit of the same [Figure 6] (a) is a rear view showing the internal switching unit lock in an unlocked state, and (b) is a rear view showing the internal switching unit lock in a locked state. [Figure 7] A plan view of the casement window showing the screen half-open in the restricted mode. [Figure 8] FIG. 10 is a diagram showing the operation of switching to the restriction release mode from the indoor side of the same. [Figure 9] A plan view of the casement window showing the sliding screen fully open in the same restriction release mode. [Figure 10] FIG. 10 shows the operation of switching to the restriction release mode from the outside of the room in the locked state. [Figure 11] FIG. 10 is a plan view showing the automatic return process to the restricted mode of the same; DETAILED DESCRIPTION OF THE INVENTION

[0021] <Summary> The opening limiting stopper device shown in Figures 1 and 2 is applied to a casement window (including vertical sliding windows, etc.) in which a shoji screen 60 opens and closes using a vertical axis on one side of the opening frame 50 as a hinge. In the illustrated example, it is applied to the left side when viewed from the inside of the casement window, but it can also be applied to the right side. It can also be applied to the bottom side of a casement window (including horizontal sliding windows, etc.) in which a shoji screen 60 opens and closes using a horizontal axis as a hinge.

[0022] The opening frame 50 is made up of a pair of vertical frames 51, 52 on the left and right and a pair of horizontal frames 53, 54 on the top and bottom, assembled in a square shape, and the shoji screen 60 is made up of a pair of vertical stiles 61, 62 on the left and right and a pair of horizontal stiles 63, 64 on the top and bottom, assembled in a square shape, with window glass fitted inside. The frame 61 on the door end of the shoji screen 60 is provided with handles 65, 66 on the inside and outside of the room for opening and closing.

[0023] <Configuration of the opening limiting stopper device> (Overall composition) As shown in Figure 3, this opening limiting stopper device is composed of an arm member 1 attached to the frame 51 of the opening frame 50 corresponding to the door edge of the shoji screen 60, an axis unit 2 built into the stile 61 at the door edge of the shoji screen 60, an internal switching unit 3 attached to the indoor side of the stile 61, and an external switching unit 4 attached to the outdoor side of the stile 61.

[0024] (Arm component) 3 and 4, arm member 1 has arm 13 swingably connected to bracket 11 fixed to frame 51 via swing shaft 12, and arm 13 is biased in the return direction by torsion coil spring 12a. Guide slot 14 formed in arm 13 has a large opening in the end portion near the swing center, and guide groove 14b communicates with engagement hole 14a and extends in an arc shape toward the tip.

[0025] Arm 13 has an inclined guide surface 15 along its outer edge. Inclined guide surface 15 is inclined in the direction from the surface on the attachment side to frame 51 toward the edge of shoji 60. At the tip of arm 13, on the surface on the attachment side to frame 51, a springy pressure plate 16 is provided so as to cover the end of guide groove 14b.

[0026] A smooth inclined surface is formed at the tip of the arm 13 so as not to damage the sealing rubber of the frame 61 that comes into contact with it when the shoji screen 60 is opened or closed.

[0027] (Axis unit) As shown in Figures 3 and 5, the axis unit 2 has a box-shaped base 21 fixed to the frame 61 at the door edge of the shoji screen 60, and is equipped with an engaging axis 22 that appears and disappears from the door edge of the shoji screen 60 as it slides relative to the base 21.The operating parts that cause the engaging axis 22 to appear and disappear are an internal operated part 23 operated from the internal switching unit 3 and an external operated part 24 operated from the external switching unit 4.

[0028] The engagement shaft 22 is shaped to have a flange 22a at its head, and in order to fit into the frame 61, the internal operated part 23 is a flange at the end of a thin shaft extending along the axis of the engagement shaft 22 and is exposed from the side of the base 21, and the external operated part 24 branches into two from the engagement shaft 22 and protrudes above and below the base 21.

[0029] The engaging shaft 22, the internal operated portion 23 and the external operated portion 24 slide together in the axial direction of the engaging shaft 22 relative to the base 21, and are biased by a compression coil spring 25 in the direction in which the engaging shaft 22 protrudes.

[0030] 3 and 4, the flange 22a of the engaging shaft 22 can pass through the large opening of the engaging hole 14a of the arm 13, but cannot pass through the narrow guide groove 14b. When the shoji screen 60 is closed, the engaging shaft 22 is positioned in correspondence with the engaging hole 14a of the arm 13 along the frame 51.

[0031] Using these components as elements, a switching mechanism is formed that switches between a restricted mode in which the opening of the shoji screen 60 is limited to half-open by the engagement shaft 22 protruding from the door edge of the shoji screen 60 being slidably inserted into the guide slot 14 and engaging with the arm 13, and a restricted release mode in which the recessed engagement shaft 22 comes out of the engagement hole 14a of the guide slot 14 and disengages from the arm 13, allowing the shoji screen 60 to be fully opened.

[0032] (Internal switching unit) As shown in Figure 3, the internal switching unit 3 is provided with a base 31 fixed to the indoor surface of the frame 61, and is equipped with a small, bifurcated internal operating piece 32 that switches between the restricted mode and the unrestricted mode by pushing or releasing the internal operated part 23 of the axis unit 2 against the force of the compression coil spring 25 as the base 31 moves between the restricted position for the restricted mode and the unrestricted position for the unrestricted mode, and an internal switching knob 33 integrated with the same.

[0033] The internal switching knob 33 is biased by a compression coil spring 34 incorporated in the base body 31 in a direction to return to a limit position, which is an initial position where the internal switching knob 33 is retracted into the base body 31 .

[0034] 3 and 6, the internal switching unit 3 is equipped with a lock 35 that prevents the internal operating piece 32 and the internal switching knob 33 from sliding and locks them in the restricted mode. The lock 35 is made up of a rotating cylinder 35a that has a keyhole, and a lock piece 35b that rises and falls with the rotation to allow or prevent the internal operating piece 32 and the internal switching knob 33 from sliding, and is switched between an unlocked state (see FIG. 6(a)) and a locked state (see FIG. 6(b)) using a separately prepared key (not shown).

[0035] (External switching unit) As shown in Figure 3, the external switching unit 4 is provided with a base 41 fixed to the exterior surface of the frame 61, and is equipped with a large, bifurcated external operating piece 42 that switches between the restricted mode and the unrestricted mode by pushing or releasing the external operated part 24 of the axis unit 2 against the force of the compression coil spring 25 as the unit moves between the restricted position for the restricted mode and the unrestricted position for the unrestricted mode, and an external switching knob 43 integrated with the external operating piece 42.

[0036] The external operation piece 42 is biased by a compression coil spring 44 incorporated in the base body 41 in a direction to return to the limit position, which is the initial position.

[0037] <Shoji screen half-open in restricted mode> As shown by the dotted line in Figure 1, if you turn the handle 65 on the inside of the room without operating the internal switching knob 33 and push the front end of the shoji screen 60 out to open it, the engagement shaft 22 will enter the guide groove 14b from the engagement hole portion 14a of the guide slot 14, as shown in Figure 4.

[0038] Next, as the lower end of the arm 13 swings outward, the flange 22a of the engagement shaft 22 engages with the arm 13 at the portion facing both side edges of the guide groove 14b, and the engagement shaft 22 slides along the guide groove 14b, opening the shoji screen 60.

[0039] When the engaging shaft 22 reaches the end of the guide groove 14b, the shoji screen 60 can no longer be opened, and as shown in Figure 7, the opening of the shoji screen 60 is limited to half-open, thereby preventing accidents involving falls.

[0040] When the shoji screen 60 is half-open, the flange 22a of the engagement shaft 22 is sandwiched between the arm 13 and the spring-like pressure plate 16, and the engagement shaft 22 is held at the peripheral end of the guide groove 14b, preventing the shoji screen 60 from being blown closed suddenly by the wind.

[0041] As shown in Figure 6(b), when the lock 35 of the internal switching unit 3 is locked using a key held only by a specific person (such as the building manager), the door 60 is fixed in a restricted mode that limits the door 60 to being half-open. This prevents ordinary people who do not have the key from opening the door 60 fully by switching it to the unrestricted mode, as described below, thereby preventing accidents such as people falling.

[0042] <Fully opening the shoji screen from inside the room> To switch to the restriction release mode from inside the room when cleaning the window glass, etc., the lock 35 of the internal switching unit 3 is set to the unlocked state as shown in Figure 6(a) so that the internal operating piece 32 and the internal switching knob 33 can slide, and then the internal switching knob 33 is slid from the restriction position to the restriction release position as shown in Figure 8.

[0043] As a result, the internal operating piece 32 pushes the internal operated part 23 against the biasing force of the compression coil spring 25, and as a result, the flange 22a of the retracted engaging shaft 22 passes through the engaging / disengaging hole 14a of the guide slot 14, and the engaging shaft 22 disengages from the arm 13. At this time, the external operated part 24 also slides together with the engaging shaft 22, but the position of the external operating piece 42 does not change.

[0044] As shown in Figure 1, by turning the handle 65 on the indoor side and pushing out the leading edge of the shoji screen 60, the shoji screen 60 can be fully opened as shown in Figure 9. At this time, it is necessary to keep the internal switching knob 33 slid to the release position until the engagement shaft 22 comes out of the engagement / disengagement hole 14a and moves to the outside of the room. In other words, while pushing out the handle 65 with one hand until the shoji screen 60 opens, it is necessary to keep the internal switching knob 33 slid with the other hand.

[0045] In this way, when the shoji screen 60 is fully opened in the restriction release mode, as in the case of a sliding window supported by a friction stay, if a gap is secured between the frame 52 of the opening frame 50 and the frame 62 of the shoji screen 60 on the hanging side of the shoji screen 60, dirt on the outside surface of the window glass of the shoji screen 60 can be easily wiped off from the inside of the room.

[0046] <Fully opening the shoji screen from the outside> When opening the shoji screen from the outside in the event of a fire, etc., the external switching knob 43 of the external switching unit 4 is slid from the restricted position to the released position as shown in Figure 10. If the shoji screen is half-open, it is first closed using the handle 66 on the outside of the room.

[0047] At this time, even if the internal operating piece 32 of the internal switching unit 3 is in the restricted mode in the restricted position, and further even if the lock 35 of the internal switching unit 3 is in the locked state as shown in FIG. 6(b) and the internal operating piece 32 is locked in the restricted position by the lock piece 35b as shown in FIG. 10, the engagement shaft 22 is not constrained by the internal operating piece 32, so the external switching knob 43 of the external switching unit 4 can be slid from the restricted position to the restricted release position independently of the internal operating piece 32 and the internal switching knob 33 of the internal switching unit 3. tree, You can switch to unrestricted mode.

[0048] When the external switching knob 43 is slid from the restricted position to the released position, the external operating piece 42 pushes the external operated part 24 of the shaft unit 2 against the spring force of the compression coil spring 25, and as a result, the flange 22a of the submerged engaging shaft 22 passes through the engaging / disengaging hole portion 14a of the guide slot 14, and the engaging shaft 22 disengages from the arm 13.

[0049] Then, as shown in Figure 2, by turning the handle 66 on the outside of the room and pulling the leading edge of the shoji screen 60 outward, the shoji screen 60 can be fully opened as shown in Figure 9. At this time, it is necessary to keep the external switching knob 43 slid to the release position until the engagement shaft 22 comes out of the engagement / disengagement hole 14a and moves outward. In other words, while pulling the handle 66 with one hand until the shoji screen 60 opens, it is necessary to keep the external switching knob 43 slid with the other hand.

[0050] In this way, even if this opening limiting stopper device is in the restricted mode or locked state on the inside of the room, it can be switched to the unrestricted mode in which the shoji screen 60 can be fully opened from the outside of the room, preventing falls and enabling the shoji screen to be opened from the outside of the room in an emergency such as a fire, and it can also be used for casement windows that serve as emergency entrances.

[0051] <Automatic return to restricted mode> When the fully opened shoji screen 60 is to be closed after cleaning work etc. is completed, as shown in Figure 11, the engagement shaft 22, which is protruding due to the biasing force of the compression coil spring 25, slides against the inclined guide surface 15 of the arm 13 waiting in a position along the frame 51, and then sinks in against the biasing force of the compression coil spring 25.

[0052] When the engaging shaft 22 reaches the engaging / disengaging hole portion 14a of the guide slot 14, the engaging shaft 22 protrudes due to the biasing force of the compression coil spring 25, and the flange 22a of the engaging shaft 22 passes through the engaging / disengaging hole portion 14a, and the engaging shaft 22 is inserted into the guide slot 14, so that the mode automatically returns to the restricted mode without any operation being performed.

[0053] This prevents the risk of someone falling due to the screen 60 being fully opened due to forgetting to switch to the restricted mode.

[0054] Furthermore, during the process of automatic return to the restricted mode, the internal switching knob 33 of the internal switching unit 3 and the external switching knob 43 of the external switching unit 4 are held in their initial restricted position by the biasing force, without being affected by the sliding of the engaging shaft 22 of the shaft unit 2 or the internal operated part 23 and external operated part 24, and since the internal switching knob 33 of the internal switching unit 3 does not protrude from the side of the base 31, it will not get caught on clothing or the like and be damaged.

[0055] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. Therefore, the scope of the present invention is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims.

[0056] For example, in the described embodiment, the internal operated portion 23 of the shaft unit 2 is positioned on the axis of the engagement shaft 22, and the external operated portion 24 is positioned away from the axis of the engagement shaft 22 so as to branch off from the axis of the engagement shaft 22, but the present invention is not limited to this, and the external operated portion 24 of the shaft unit 2 may be configured to be positioned on the axis of the engagement shaft 22, and the internal operated portion 23 may be positioned away from the axis of the engagement shaft 22 so as to branch off from the axis of the engagement shaft 22.

[0057] Furthermore, although the described embodiment includes the lock 35, the present invention is also applicable to an opening limiting stopper device that does not include the lock 35.

[0058] Furthermore, in the described embodiment, the lock piece 35b driven by the lock 35 is configured to allow or prevent sliding of the internal operating piece 32 integrated with the internal switching knob 33, but the internal switching knob 33 and the internal operating piece 32 may be separated into two components, and a configuration may be adopted in which sliding of only one of them is allowed or prevented. Also, the external switching knob 43 and the external operating piece 42 may be separated into two components. [Explanation of symbols]

[0059] 1 Arm member 2-axis unit 3 Internal switching unit 4 External switching unit 11 Bracket 12 Oscillating shaft 12a Torsion coil spring 13 Arm 14 Guide slot 14a Engagement / disengagement hole 14b Guide groove 15 Inclined guide surface 16 Pressure plate 21 Base 22 Engagement shaft 22a flange 23 Internal operated part 24 External operated part 25 compression coil spring 31 Base 32 Internal operation piece 33 Internal switching knob 34 Compression coil spring 35 tablets 35a cylinder 35b Lock piece 41 Base 42 External operation piece 43 External switching knob 44 Compression coil spring 50 Opening frame Frames 51, 52, 53, 54 60 Shoji screen 61,62,63,64 stile 65,66 Handle

Claims

1. It consists of an arm member (1) attached to a frame corresponding to the door edge of the shoji screen, an axis unit (2) built into the door frame of the door edge of the shoji screen, an internal switching unit (3) attached to the indoor side of the door frame, and an external switching unit (4) attached to the outdoor side of the door frame. The arm member (1) includes an arm (13) that swings around an axis on the side attached to the frame, The shaft unit (2) constitutes a switching mechanism that switches between a restricted mode and a released mode in response to the engagement and disengagement of the arm (13) with an engagement shaft (22) that appears and disappears from the edge of the shoji door, and is provided with an internal operated part (23) that is operated from the internal switching unit (3) and an external operated part (24) that is operated from the external switching unit (4); The internal switching unit (3) includes an internal operating piece (32) and an internal switching knob (33) that operate the internal operated portion (23) in accordance with movement between a restricting position and a releasing position, The external switching unit (4) includes an external operating piece (42) and an external switching knob (43) that operate the external operated portion (24) in accordance with movement between a restricting position and a releasing position, the external operating piece (42) and the external switching knob (43) are movable from a restricted position to a released position independently of the internal operating piece (32) and the internal switching knob (33); An opening limit stopper device for a casement window that can be switched to the limit release mode by the external operating piece (42) of the external switching unit (4) even if the internal operating piece (32) and / or the internal switching knob (33) of the internal switching unit (3) are prevented from moving to the limit release position.

2. The device comprises an arm member (1) attached to a frame corresponding to the edge of a shoji door, an axis unit (2) built into the frame of the edge of the shoji door, an internal switching unit (3) attached to the inside of the frame, and an external switching unit (4) attached to the outside of the frame, The arm member (1) includes an arm (13) that swings around an axis on the side attached to the frame, The shaft unit (2) constitutes a switching mechanism that switches between a restricted mode and a released mode in response to the engagement and disengagement of the arm (13) with an engagement shaft (22) that appears and disappears from the edge of the shoji door, and is provided with an internal operated part (23) that is operated from the internal switching unit (3) and an external operated part (24) that is operated from the external switching unit (4); The internal switching unit (3) includes an internal operating piece (32) and an internal switching knob (33) that operate the internal operated portion (23) in accordance with movement between a restricting position and a releasing position, The external switching unit (4) includes an external operating piece (42) and an external switching knob (43) that operate the external operated portion (24) in accordance with movement between a restricting position and a releasing position, Even if the internal operating piece (32) of the internal switching unit (3) is in the restricted mode at the restricted position, the external operating piece (42) of the external switching unit (4) can be used to switch to the restricted mode. The arm (13) is provided with an inclined guide surface (15) along its outer edge, When closing a sliding door that is fully open in the restriction release mode, the engaging shaft (22) that protrudes due to the biasing force slides against the inclined guide surface (15) of the arm (13) and sinks in against the biasing force, and then protrudes to engage with the arm (13), automatically returning to the restriction mode.

3. The device comprises an arm member (1) attached to a frame corresponding to the edge of a shoji door, an axis unit (2) built into the frame of the edge of the shoji door, an internal switching unit (3) attached to the inside of the frame, and an external switching unit (4) attached to the outside of the frame, The arm member (1) includes an arm (13) that swings around an axis on the side attached to the frame, The shaft unit (2) constitutes a switching mechanism that switches between a restricted mode and a released mode in response to the engagement and disengagement of the arm (13) with an engagement shaft (22) that appears and disappears from the edge of the shoji door, and is provided with an internal operated part (23) that is operated from the internal switching unit (3) and an external operated part (24) that is operated from the external switching unit (4); The internal switching unit (3) includes an internal operating piece (32) and an internal switching knob (33) that operate the internal operated portion (23) in accordance with movement between a restricting position and a releasing position, The external switching unit (4) includes an external operating piece (42) and an external switching knob (43) that operate the external operated portion (24) in accordance with movement between a restricting position and a releasing position, Even if the internal operating piece (32) of the internal switching unit (3) is in the restricted mode at the restricted position, the external operating piece (42) of the external switching unit (4) can be used to switch to the restricted mode. The internal operating piece (32) and / or the internal switching knob (33) of the internal switching unit (3), and the external operating piece (42) and / or the external switching knob (43) of the external switching unit (4) are biased in the direction returning from the release position to the limit position, in this casement window opening limit stopper device.

4. The device comprises an arm member (1) attached to a frame corresponding to the edge of a shoji door, an axis unit (2) built into the frame of the edge of the shoji door, an internal switching unit (3) attached to the inside of the frame, and an external switching unit (4) attached to the outside of the frame, The arm member (1) includes an arm (13) that swings around an axis on the side attached to the frame, The shaft unit (2) constitutes a switching mechanism that switches between a restricted mode and a released mode in response to the engagement and disengagement of the arm (13) with an engagement shaft (22) that appears and disappears from the edge of the shoji door, and is provided with an internal operated part (23) that is operated from the internal switching unit (3) and an external operated part (24) that is operated from the external switching unit (4); The internal switching unit (3) includes an internal operating piece (32) and an internal switching knob (33) that operate the internal operated portion (23) in accordance with movement between a restricting position and a releasing position, The external switching unit (4) includes an external operating piece (42) and an external switching knob (43) that operate the external operated portion (24) in accordance with movement between a restricting position and a releasing position, Even if the internal operating piece (32) of the internal switching unit (3) is in the restricted mode at the restricted position, the external operating piece (42) of the external switching unit (4) can be used to switch to the restricted mode. One of the internal operated portion (23) and the external operated portion (24) of the shaft unit (2) is located on the axis of the engaging shaft (22), and the other is located away from the axis of the engaging shaft (22) so as to branch off from the axis of the engaging shaft (22), An opening limiting stopper device for a casement window in which the engaging shaft (22), internal operated part (23) and external operated part (24) move as a unit relative to the base (21) of the shaft unit (2) fixed to the shoji screen.

5. The opening limit stopper device for a casement window as described in any one of claims 1 to 4, characterized in that the internal switching unit (3) is provided with a lock (35) that prevents movement of the internal operating piece (32) and / or the internal switching knob (33) and locks it in the limit mode.

Images