Glass unit anti-detachment mechanism

Abstract

This invention provides a glass unit retention structure that allows for precise installation with small clearances and enables the replacement of the glass unit 4 if necessary even after installation. [Solution] The frame material has an inner circumferential surface in which the front portion 31 and the rear front portion 32 are continuous in a substantially L-shaped cross-section. The receiving bracket 5 comprises a fixing base portion 51 fixed to the front portion 31 and a rear receiving portion 52 that protrudes inward from the opening surface and is positioned along the rear front portion 32. Thickened portions 53 are provided at both ends of the fixing base portion 51, and a gap S is formed between the intermediate portion 54 sandwiched between the thickened portions 53 and the front portion 31. The retaining bracket 6 comprises an engaging base portion 61 inserted into the gap S and a front retaining portion 62 that protrudes inward from the opening surface. At the location where the fixing base portion 51 of the receiving bracket 5 and the engaging base portion 61 of the retaining bracket 6 overlap each other, a means for detaching the fixing base portion 51 and the engaging base portion 61 is provided, which allows the retaining bracket 6 to be moved in the length direction of the frame material 30 to detachably connect the fixing base portion 51 and the engaging base portion 61.

Description

Technical Field

[0001] The invention disclosed in the present application relates to a structure for preventing the glass unit from coming off, which is applied between the peripheral edge of the glass unit and the frame body in a fitting such as a window sash in which the glass unit is housed inside the frame body.

Background Art

[0002] In a fitting in which a glass unit made of multilayer glass or the like is housed within the opening surface of a frame body (including the frame of a fixed window, the same shall apply hereinafter), even when exposed to the heat of a fire, the frame body does not deform or melt and flames do not spout from one side to the other between the inside and outside, and the glass unit does not easily fall off, and thus it is necessary to have fireproof performance.

[0003] In an aluminum alloy window sash, a frame member (including the frame member of a fixed window, the same shall apply hereinafter) having a substantially U-shaped cross section surrounds the four sides of the glass unit, and the glass unit can be held within the opening surface by screw-joining the corner portions where these frame members abut against each other. On the other hand, in a synthetic resin window sash, the frame members are assembled into a rectangle in advance and the corner portions are welded and joined, and after the glass unit is housed in a direction perpendicular to the opening surface from the indoor side or the outdoor side, an edge is attached to the frame member to press the peripheral edge of the glass unit, and such an assembly structure is often adopted. Patent Documents 1 to 8 and the like disclose a structure for preventing the glass unit from coming off, which is applied to a synthetic resin window sash adopting such an assembly structure.

[0004] The glass unit retention structures disclosed in these documents basically consist of fixing a first glass unit retaining bracket at multiple appropriate intervals to the recessed or exposed portion of each frame member constituting the four sides of the frame (on the indoor side when the glass unit is installed from the outdoor side, and on the outdoor side when it is installed from the indoor side) by screws or the like at the recessed portion or exposed portion of each frame member constituting the four sides of the frame, and attaching a setting block that serves as a support base for the glass unit to the recessed portion of the frame member, then installing the glass unit into the opening surface of the frame from the front side (opposite the aforementioned recessed portion) with the peripheral edge of the glass unit along the setting block, and then attaching a second glass unit retaining bracket from the front side so as to connect with the first glass unit retaining bracket, thereby holding the peripheral edge of the glass unit in place by sandwiching it in the groove formed by both retaining brackets. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2010-248837 [Patent Document 2] Japanese Patent Publication No. 2012-140785 [Patent Document 3] Japanese Patent Publication No. 2016-023529 [Patent Document 4] Japanese Patent Publication No. 2017-218870 [Patent Document 5] Japanese Patent Publication No. 2019-065559 [Patent Document 6] Japanese Patent Publication No. 2019-085834 [Patent Document 7] Japanese Patent Publication No. 2019-127768 [Patent Document 8] Japanese Patent Publication No. 2021-161606 [Overview of the project] [Problems that the invention aims to solve]

[0006] The glass unit retention structures disclosed in the aforementioned Patent Documents 1 to 8 all employ a coupling method in which an inclined piece is cut and raised at the point where a first glass unit retaining fitting fixed to the back side of the frame material (hereinafter referred to as the "receiving fitting" in this specification) and a second glass unit retaining fitting attached from the front side after the glass unit has been installed (hereinafter referred to as the "retaining fitting" in this specification) overlap, and a notch is formed at the other side, so that when the retaining fitting is fitted into the receiving fitting the inclined piece catches on the notch and the two fittings are coupled together.

[0007] However, with this type of connection, once the retaining bracket is fitted into the receiving bracket, the two brackets cannot be removed. Therefore, if, for example, the glass unit breaks after installation, it becomes difficult to remove the retaining bracket and replace the glass unit.

[0008] Furthermore, when fitting the two fittings together, the inclined piece is deformed to reduce its angle of inclination and hooked into the notch, which requires a slight clearance where they overlap. As a result, there is a possibility that a slight looseness may remain in the connection between the two fittings.

[0009] The invention disclosed herein was conceived in view of these circumstances, and aims to provide a glass unit anti-detachment structure that allows the two fittings to be separated even after the receiving fitting and retaining fitting have been joined, if necessary for glass replacement or the like, and that allows the two fittings to be joined with a small clearance without rattling. [Means for solving the problem]

[0010] To achieve the aforementioned objective, the glass unit retention structure of the present invention disclosed herein is a structure in which a glass unit is placed within the opening surface of a frame body formed by assembling frame members on all four sides, from either the indoor or outdoor side, and the peripheral edge of the glass unit is held in place by being sandwiched between a receiving fitting fixed to each of the frame members and a retaining fitting coupled to each of the receiving fittings. The frame member has an inner circumferential surface having a substantially L-shaped cross-section that is continuous with a projection portion that defines the outer edge of the opening surface perpendicular to the opening surface of the frame body and a rear projection portion that extends inward from either the indoor or outdoor side of the projection portion into the opening surface of the frame body. The receiving fitting and the retaining fitting are each formed by bending a single metal plate. The receiving fitting has a fixing base portion that is fixed by overlapping it with the projection portion of the frame member, and a projection from the other edge of the fixing base perpendicular to the fixing base into the opening surface of the frame body. The frame comprises a rear receiving portion that protrudes inward from the opening surface and is positioned along the rear visible portion of the frame material, and thickened portions are provided on the outer side of the opening surface at both ends of the fixing base portion in the opening width direction of the frame body, and when the fixing base portion is placed on top of the recess portion, the intermediate portion sandwiched between the two thickened portions separates from the recess portion, forming a gap between the intermediate portion and the recess portion, and the retaining bracket is a flat insert that is inserted into the gap from one side and placed on top of the recess portion The basic configuration includes an engagement base portion including a part, and a front-side pressing portion that extends from one edge of the engagement base portion perpendicular to the engagement base portion toward the inside of the opening surface of the frame body, and a means for engaging and disengaging is provided at the location where the fixed base portion of the receiving fitting and the engagement base portion of the pressing fitting overlap each other, by moving at least a portion of the pressing fitting in the direction of the length of the frame material to detachably connect the fixed base portion and the engagement base portion.

[0011] Furthermore, as one specific embodiment based on the basic configuration, the glass unit retaining structure of the invention disclosed herein is set such that the size of the gap and the plate thickness of the engagement base substantially match, and the engagement / disengagement means comprises a plurality of screw insertion holes formed in the intermediate part of the fixing base so as to be parallel to the material length direction of the frame material, a plurality of fixing screws that are inserted into each of the screw insertion holes and fastened to the recess of the frame material, and the other side of the engagement base The device is configured to include a plurality of screw engagement portions, each screw engagement portion having a shape in which a protruding portion that extends from the insertion portion toward the other side and a locking piece that extends from the protruding end of the protruding portion in the direction of the length of the frame material are continuous, and by inserting each screw engagement portion to the side of each fixing screw and sliding the retaining bracket in the direction of the length of the frame material, the recess formed between the locking piece and the insertion portion is fitted onto the fixing screw.

[0012] Furthermore, the glass unit retaining structure of the invention disclosed in this application, as one specific embodiment based on the basic configuration, is set such that the size of the gap and the plate thickness of the engaging base substantially match, and the engaging means is formed by making the depth of the thickened portions formed at both ends of the fixed base smaller than the depth of the fixed base, thereby extending the gap to the other side of the thickened portions, and the front pressing portion is shaped so that the central part in the opening width direction of the frame body can be elastically refracted and deformed such that the other side is at a lower angle, and the central part side when the front pressing portion is refracted and deformed The device can also be configured to include an insertion portion divided into left and right sections to avoid interfering with each other, and a pair of left and right locking pieces projecting in opposite directions from both ends of the insertion portion in the opening width direction of the frame material along the length direction of the frame material, wherein the front pressing portion is bent and deformed to shorten the width of the engagement base portion, the engagement base portion is inserted into the gap, and once the locking piece portion is inserted beyond the thickened portion to the other side, the bent deformation of the front pressing portion is released and the locking piece portion is moved in the length direction of the frame material, thereby engaging the locking piece portion with the engaged portion.

[0013] Furthermore, the glass unit retention structure of the invention disclosed herein, as one specific embodiment based on the basic configuration, comprises an engaging portion provided on one edge of the intermediate portion of the fixing base, and a locking edge provided on the other edge of the insertion portion of the engagement base, wherein the engaging portion is formed by bending a folded piece extending from the one edge over a portion of the intermediate portion in the opening width direction so as to be in close contact with the outside of the opening surface of the intermediate portion, and the size of the gap formed between the engaging portion and the recess of the frame material is set to substantially match the plate thickness of the insertion portion of the engagement base, and the locking edge is the The locking edge is formed by bending a folded piece extending from the other edge so that it is in close contact with the inside of the opening surface of the insertion part, and the thickness of the locking edge is set to be smaller than the portion in the gap between the intermediate part and the recessed part in which the engaged portion is not formed, and larger than the portion in which the engaged portion is formed, and the width of the engagement base in the opening width direction is set to be smaller than the width of the portion in the intermediate part of the receiving fitting in which the engaged portion is not formed, and the locking edge can be engaged with the engaged portion by sliding the engagement base, which has been inserted into the gap in the portion in which the engaged portion is not provided, to the side in which the engaged portion is provided. [Effects of the Invention]

[0014] As described above, the glass unit retaining structure allows for the removal of the retaining bracket from the receiving bracket even after the retaining bracket has been attached, in case of glass replacement or other necessary procedures. Furthermore, since the receiving bracket and the retaining bracket are joined with minimal clearance and without any looseness, the glass unit is held securely in place. [Brief explanation of the drawing]

[0015] [Figure 1] This is an outdoor front view of a vertical sliding window to which the glass unit retention structure disclosed in this application is applied. [Figure 2] Similarly, it is a front view of the indoor side of the vertical sliding window. [Figure 3] It is a longitudinal sectional view of the vertical sliding window shown in FIGS. 1 and 2, with the middle part omitted. [Figure 4] Similarly, it is a transverse sectional view of the vertical sliding window shown in FIGS. 1 and 2, with the middle part omitted. [Figure 5] It is an enlarged sectional view of the lower side part, showing the main part of the detachment prevention structure of the glass unit according to the first embodiment of the invention disclosed in the present application. [Figure 6] It is a combined perspective view showing the configuration and coupling form of the receiving fitting and the pressing fitting employed in the detachment prevention structure of the glass unit according to the first embodiment. [Figure 7] It is a combined three-view drawing showing the configuration and coupling form of the receiving fitting and the pressing fitting shown in FIG. 6. [Figure 8] It is an enlarged sectional view of the lower side part, showing the main part of the detachment prevention structure of the glass unit according to the second embodiment of the invention disclosed in the present application. [Figure 9] It is a combined perspective view showing the configuration and coupling form of the receiving fitting and the pressing fitting employed in the detachment prevention structure of the glass unit according to the second embodiment. [Figure 10] It is a combined three-view drawing showing the configuration and coupling form of the receiving fitting and the pressing fitting shown in FIG. 9. [Figure 11] It is an enlarged sectional view of the lower side part, showing the main part of the detachment prevention structure of the glass unit according to the third embodiment of the invention disclosed in the present application. [Figure 12] It is a combined perspective view showing the configuration and coupling form of the receiving fitting and the pressing fitting employed in the detachment prevention structure of the glass unit according to the third embodiment. [Figure 13] It is a combined three-view drawing showing the configuration and coupling form of the receiving fitting and the pressing fitting shown in FIG. 12.

Mode for Carrying Out the Invention

[0016] The embodiments of the invention disclosed herein will be described below with reference to the drawings. The glass unit retention structure disclosed herein is intended to be applied to the joint between the frame of a sliding door and the glass unit in building fixtures such as window sashes and doors with windows to which sliding doors are assembled, but the opening and closing method of the sliding door is not particularly limited. Furthermore, although this glass unit retention structure is intended to be applied mainly to frames made of synthetic resin, it can also be applied to composite sashes that combine synthetic resin frame material and metal frame material. In addition, this glass unit retention structure can be applied not only to the frame of a sliding door but also to the frame of a fixed window, in which case it can be implemented in the same way by reading "frame / frame material" as "frame / frame material".

[0017] [Basic structure of joinery] Figures 1 to 4 show an example of a joinery to which this glass unit anti-detachment structure is applied. The example joinery is a vertical sliding window in which a sash 2 assembled on a vertically elongated rectangular frame 1 is opened and closed to the outside by operating an opening / closing device (operator handle) 9 attached to the lower frame material 10 from the inside.

[0018] The frame members 10 that make up the four sides of the frame body 1 are all extruded materials made of synthetic resin. The frame members 10 on all four sides have a common cross-sectional shape, and the ends that are cut at a 45-degree angle are butted together in a mitered joint and welded to form a rectangle.

[0019] Similarly, the top, bottom, left, and right frame members 30 that constitute the frame body 3 of the shoji screen 2 are also extruded materials made of synthetic resin. The frame members 30 on all four sides have a common cross-sectional shape, and these are also joined by welding together the ends that have been cut at a 45-degree angle in a mitered joint. The essential part of the present invention lies in the arrangement of the glass retaining fittings that are attached between the frame members 30 and the glass unit 4, and the details thereof will be described later in relation to the cross-sectional shape of the frame members 30.

[0020] In the example embodiment, the glass unit 4 employs three layers of fire-resistant glass. This fire-resistant glass is formed, for example, by sandwiching a heat-resistant tempered glass plate 41, positioned in the center in the thickness direction, between non-heat-resistant glass plates 42 and 43 positioned on either side of it. Spacers 44 and 45 are interposed around the entire circumference between the periphery of the heat-resistant tempered glass plate 41 and the periphery of the non-heat-resistant glass plates 42 and 43. These spacers 44 and 45 are bonded to the heat-resistant tempered glass plate 41 and the non-heat-resistant glass plates 42 and 43 via sealing members (not shown), thereby sealing the inner and outer layers of space sandwiched between the heat-resistant tempered glass plate 41 and the non-heat-resistant glass plates 42 and 43.

[0021] Furthermore, the invention disclosed herein does not limit the type or lamination configuration of the glass plates constituting the glass unit 4, and is applicable to single-layer, double-layer, or four-layer or more glass units 4. In addition, as a measure against thermal cracking of the glass plates in the event of a fire, a highly thermally conductive metal tape may be attached to the periphery of the glass unit 4, or a cover member made of a thin metal plate may be fitted.

[0022] Such a glass unit 4 is fitted into the opening surface of a frame 3 that has been pre-assembled on all four sides, from either the outdoor or indoor side in a direction perpendicular to the surface. Setting blocks 21 are interposed between the frame members 30 on the bottom and left and right vertical sides and the glass unit 4 to ensure a predetermined gap. Then, a trim 22 is attached to the frame 3 from the same side as the glass unit 4 is fitted, concealing the periphery of the glass unit 4. The sash 2 in the example form is an "external trim structure" in which the glass unit 4 is fitted into the frame 3 from the outdoor side and the trim 22 is attached. However, this glass unit 4 retention structure can also be applied to a sash 2 with an "internal trim structure" in which the glass unit 4 is fitted into the frame 3 from the indoor side and the trim 22 is attached, by reversing the indoor / outdoor direction.

[0023] In the following, when describing the positional relationships and directions of movement of parts and components, the viewpoint in Figure 1, viewed from the side where the glass unit 4 is housed in the frame 3 (the "one side" in the claims / the outdoor side in the exemplary embodiment), will be used as the reference point to specify the vertical direction (or height direction) and the horizontal direction (or opening width direction). Furthermore, the central side of the opening surface of the frame 3 will be called the inside of the opening surface or inward side, and the outer periphery side (wall side) will be called the outside of the opening surface or outward side. In addition, the indoor / outdoor direction perpendicular to the opening surface of the frame 3 will be called the depth direction (or projection direction), and in that depth direction, the side where the glass unit 4 is housed in the frame 3 will be called the front side, and the opposite side (the "other side" in the claims / the indoor side in the exemplary embodiment) will be called the back side.

[0024] [First Embodiment] Figures 5 to 7 show a first embodiment of the invention disclosed in this application. In this embodiment, the frame member 30 has an inner circumferential surface in which a recessed portion 31 that defines the outer edge of the opening surface perpendicular to the opening surface of the frame body 3 and a rear-facing portion 32 that extends from the rear side of the recessed portion 31 inward towards the opening surface is continuous in a substantially L-shape in cross-section. On the outside of this inner circumferential surface (outside the opening surface or on the rear side), there are a plurality of hollow portions 33, 34, and 35 that are continuous in the length direction of the frame member 30, and a plurality of partition wall members that surround them. However, the invention disclosed in this application does not particularly limit the shape of the partition wall members, etc. that extend to the outside of the aforementioned inner circumferential surface (recessed portion 31, rear-facing portion 32).

[0025] On the front side of the recessed portion 31, an overhanging edge portion 36 is formed that protrudes outward from the opening surface and closes the gap with the frame body 1. Furthermore, at the connection point between the recessed portion 31 and the overhanging edge portion 36, a recessed groove portion 37 is provided that opens inward from the opening surface for attaching the push trim 22 after the glass unit 4 is placed in the frame body 3. Setting blocks 21, which ensure a predetermined clearance between the frame material 30 and the glass unit 4, are attached at appropriate intervals to the recessed portion 31 in suitable locations (positions that do not interfere with the receiving fittings 5 ​​described later). In addition, a rear bead material 38 is attached to the front inner periphery of the rear visible portion 32 to close the gap with the glass unit 4.

[0026] The glass unit 4 retention structure disclosed in this application is basically the same as the background art described above, and holds the glass unit 4 between a receiving bracket 5 fixed to the back side of the frame member 30 and a retaining bracket 6 that connects to the receiving bracket 5 from the front side after the glass unit 4 is installed. The receiving bracket 5 and the retaining bracket 6 are placed at appropriate intervals, one or more times, on each of the top, bottom, left, and right frame members 30 (see Figure 1). Although Figure 5 shows a cross section perpendicular to the material axis of the lower frame member 30, the arrangement of the receiving bracket 5 and the retaining bracket 6 is basically the same for all four sides of the frame member 30, so the explanation below will focus on the arrangement of the lower side.

[0027] In the example configuration, both the receiving bracket 5 and the retaining bracket 6 are formed by bending a metal sheet material, such as a stainless steel plate. These metal sheets have sufficient rigidity to not easily deform during or after installation. The thickness of the receiving bracket 5 and the retaining bracket 6 are set to be the same, or the retaining bracket 6 is set to be slightly thinner.

[0028] The receiving bracket 5 is a member that, in side view, is continuous in an L-shape, comprising a fixing base 51 that is overlapped and fixed to the recessed portion 31 of the frame material 30, and a rear receiving portion 52 that extends from the rear edge of the fixing base 51 perpendicular to the fixing base 51 and into the inner side of the opening surface of the frame body 3.

[0029] The fixing base 51 has a roughly rectangular planar shape and extends in the material length direction (opening width direction) of the frame material 30 with a depth of about half to three-quarters of the depth portion 31 of the frame material 30. At both ends of the fixing base 51 in the opening width direction, thickened portions 53 are formed by hemming (crushing bend / crease bend) of folded pieces extending from the edges and making them tightly attached to the outside of the opening surface. Therefore, when this fixing base 51 is placed on the depth portion 31 of the frame material 30, the intermediate portion 54 sandwiched between the thickened portions 53 on both sides separates from the depth portion 31 of the frame material 30, and a gap S (see Figure 7) the thickness of one plate of the receiving bracket 5 is formed between the intermediate portion 54 and the depth portion 31. The thickened portion 53 shown in the example has a smaller depth than the fixed base portion 51 and is formed closer to the front of the fixed base portion 51, but it may also be formed over the same depth as the fixed base portion 51. Furthermore, the thickened portion 53 may be formed by extending a folded-over piece from the front edge of the fixed base portion 51 and folding it over to the back, or by overlapping and bonding a small plate separate from the fixed base portion 51 to the outside of the opening surface of the fixed base portion 51.

[0030] In the intermediate section 54, two screw insertion holes 55 are formed on the left and right sides, spaced at an appropriate interval D1, so as to be parallel to the length direction of the frame material 30. In addition, a gap D2 is provided between each screw insertion hole 55 and the thickened section 53, allowing for the insertion of a screw engagement portion 64, which will be described later.

[0031] The rear support portion 52 has a roughly rectangular front shape, is slightly lower than the rear visible portion 32 of the frame material 30, and extends in the length direction (opening width direction) of the frame material 30 at a height that does not interfere with the rear bead material 38. In the example embodiment, the width of the rear support portion 52 and the width of the fixing base portion 51 are the same, but they may be different. This support fitting 5 is positioned so that the rear support portion 52 is aligned with the rear visible portion 32 of the frame material 30, and the fixing base portion 51 is overlapped with the depth portion 31 of the frame material 30. The rear support portion 52 and the rear visible portion 32 may be in contact with each other or slightly separated. Then, the mounting bracket 5 is fixed to the frame material 30 by inserting fixing screws 71 into the two screw insertion holes 55 formed in the intermediate portion 54 of the fixing base 51, passing them through the recessed portion 31, and fastening them to a metal reinforcing material 23 of an appropriate shape that has been pre-installed in the hollow portion 33 of the frame material 30. The cross-sectional shapes of the hollow portion 33 and the metal reinforcing material 23 are not particularly limited in this invention.

[0032] When viewing the receiving bracket 5 fixed to the frame member 30 from the front, the shafts of the two fixing screws 71 are slightly visible in the gap S between the middle part 54 of the fixing base 51 and the recessed part 31 of the frame member 30 (see Figure 7). After fixing multiple receiving brackets 5 to the appropriate locations on the frame members 30 that make up the frame body 3, the glass unit 4 is placed into the frame body 3 from the front and temporarily placed inside the opening surface of the setting block 21.

[0033] The retaining bracket 6 is a member that, in side view, is continuous in an L-shape, comprising an engaging base 61 that overlaps the recess 31 of the frame material 30, and a front retaining portion 62 that extends from the front edge of the engaging base 61 perpendicular to the engaging base 61 and into the inner side of the opening surface of the frame body 3.

[0034] The engaging base 61 is a flat portion without irregularities and has a rectangular insertion portion 63 in plan view and two screw engaging portions 64 on the left and right sides located behind the insertion portion 63. Preferably, the thickness of the engaging base 61 is such that it approximately matches the size (height) of the gap S formed between the intermediate portion 54 of the fixing base 51 and the recessed portion 31 of the frame material 30, and that it fits snugly into the gap S without any force. The width of the insertion portion 63 is slightly smaller than the width of the intermediate portion 54.

[0035] The screw engagement portion 64 has a shape in which a short projection portion 641 that protrudes toward the rear and a locking piece portion 642 that extends from the protruding end of the projection portion 641 in the direction of the length of the frame material 30 are bent and continuous in a roughly L-shape when viewed from above. The width (dimension in the opening width direction) W1 of the screw engagement portion 64, which includes the projection portion 641 and the locking piece portion 642, is slightly smaller than the distance D2 between the thickened portion 53 of the fixing base portion 51 of the receiving bracket 5 and the screw insertion hole 55. The extension direction of the locking piece portion 642 in the two screw engagement portions 64 is the same. One of the two screw engagement portions 64 is projected from near one end of the engagement base portion 61, while the other screw engagement portion 64 is projected from the other screw engagement portion 64 at a position the same distance D1 as the spacing between the two fixing screws 71. The depth D3 of the recess formed between the insertion portion 63 and the locking piece portion 642 is approximately equal to the diameter of the fixing screw 71. In addition, a small retaining claw 643 is formed on the front edge of the locking piece portion 642, protruding toward the front side (towards the insertion portion 63).

[0036] The front retaining portion 62 has a roughly rectangular front shape, is about the same height as the rear receiving portion 52, and extends in the length direction (opening width direction) of the frame material 30. In the example embodiment, the width of the engaging base portion 61 and the width of the front retaining portion 62 are the same, but they may be different.

[0037] The retaining bracket 6 is installed by inserting the engaging base 61 into the gap S formed between the middle part 54 of the receiving bracket 5 and the recessed part 31 of the frame material 30, after the glass unit 4 has been placed inside the opening surface of the receiving bracket 5 from the front side. The installation involves inserting the two screw engaging parts 64 into the sides of the two fixing screws 71 that secure the receiving bracket 5 to the frame material 30, and once the rear edge of the insertion part 63 contacts the fixing screw 71, sliding the retaining bracket 6 towards the extended side of the locking piece 642 to engage the recess formed between the locking piece 642 and the insertion part 63 with the fixing screw 71. The screw engaging parts 64 that are engaged with the fixing screw 71 are held in place by the retaining claws 643 formed on the locking piece 642 so that they do not easily come off. Furthermore, the fixing screws 71 and screw engagement parts 64 may be provided in three or more locations on each set of receiving brackets 5 and retaining brackets 6.

[0038] Once the retaining bracket 6 is attached to the receiving bracket 5, the glass unit 4 is held in place between the rear receiving portion 52 of the receiving bracket 5 and the front retaining portion 62 of the retaining bracket 6, preventing it from falling out. Next, the pressing edge 22 is fitted into the recessed groove 37 formed on the front side of the recessed portion 31 of the frame material 30, completing the assembly of the shoji screen 2.

[0039] The retaining structure for the glass unit 4, as configured in this way, involves creating a gap S between the receiving bracket 5 and the frame material 30, inserting the engagement base 61 of a retaining bracket 6 made of a flat plate material with a thickness approximately matching the size of the gap S, and sliding the retaining bracket 6 in the length direction of the frame material 30 to engage with the fixing screws 71 placed in the gap S. Therefore, at the points where the receiving bracket 5 and the retaining bracket 6 overlap, the clearance that needs to be secured in the thickness direction (inward and outward direction of the opening surface) can be made almost zero, allowing for a highly precise and rattle-free connection. The receiving bracket 5 and the retaining bracket 6 can be manufactured using only simple punching and bending processes, thus keeping manufacturing costs down. Furthermore, even if the glass unit 4 breaks after installation and needs to be replaced, after removing the retaining edge 22, the retaining bracket 6 can be separated from the receiving bracket 5 by sliding it along the length direction of the frame material 30 in the opposite direction to how it was installed.

[0040] In other words, in this first embodiment, a means for detachably connecting the fixing base 51 and the engaging base 61 is configured by a plurality of screw insertion holes 55 formed in the intermediate portion 54 of the fixing base 51, a plurality of fixing screws 71 that are inserted into these screw insertion holes 55 and fastened to the recessed portion 31 of the frame material 30, and a plurality of screw engagement portions 64 provided on the inner side of the engaging base 61.

[0041] [Second Embodiment] Figures 8 to 10 show a second embodiment of the invention disclosed herein. The frame member 30 shown in Figure 8 is the lower frame that constitutes the sash 2 of a sliding window. This frame member 30 is a "internal edging structure" member in which the positional relationship in the indoor-outdoor direction is reversed compared to the frame member 30 of the vertical sliding window shown in the first embodiment, and the glass unit 4 is housed in the opening surface of the frame member 3 from the indoor side. Similar to the first embodiment, the frame member 30 of this second embodiment also has an inner circumferential surface in which a recessed portion 31 that defines the outer edge of the opening surface perpendicular to the opening surface of the frame body 3 and a rear-side visible portion 32 that protrudes inward from the rear side (outdoor side) of the recessed portion 31 into the inside of the opening surface are continuous in a substantially L-shape in cross-section. Although the cross-sectional shapes of the hollow portions 33, 34, 35 and partition wall members provided on the outer side of the inner circumferential surface (outside the opening surface or on the inner side) differ slightly from those of the first embodiment, the basic configuration as a structure to prevent the glass unit from coming off is the same. Therefore, components that are substantially the same as those in the first embodiment will be denoted by the same reference numerals below, and their detailed descriptions will be kept brief.

[0042] The receiving bracket 5 and the retaining bracket 6 in this second embodiment are also formed by bending a metal sheet material such as a stainless steel plate. The receiving bracket 5 is generally the same as the receiving bracket 5 in the first embodiment, and consists of a fixing base 51 that is superimposed and fixed to the recess 31 of the frame material 30, and a rear receiving portion 52 that extends from the rear edge of the fixing base 51 perpendicular to the fixing base 51 and into the inside of the opening surface, which are continuous in an L-shape when viewed from the side.

[0043] The fixing base 51 has a roughly rectangular planar shape and extends in the material length direction (opening width direction) of the frame material 30 with a depth of about half to three-quarters of the depth portion 31 of the frame material 30. At both ends of the fixing base 51 in the opening width direction, thickened portions 53 are formed by hemming-bending folded pieces extending from their edges to adhere closely to the outside of the opening surface. Therefore, when this fixing base 51 is placed on the depth portion 31 of the frame material 30, the intermediate portion 54 sandwiched between the thickened portions 53 on both sides separates from the depth portion 31 of the frame material 30, and a gap S (see Figure 10) the size of one plate thickness of the receiving bracket 5 is formed between the intermediate portion 54 and the depth portion 31.

[0044] Similar to the first embodiment, the thickened portion 53 can also be formed by extending a folded piece from the front edge of the fixed base 51 and folding it over to the back, or by overlapping and bonding a small plate separate from the fixed base 51 to the outside of the opening surface of the fixed base 51. However, in this second embodiment, the important point is that the depth of the thickened portion 53 is made smaller than the overall depth of the fixed base 51 and positioned closer to the front of the fixed base 51, thereby extending the gap S formed between the intermediate portion 54 and the recessed portion 31 to the back of the thickened portion 53. This narrow gap S, extended to the back of the thickened portion 53, becomes the engaged portion 56 for connecting the retaining bracket 6. Furthermore, in this second embodiment, the screw insertion holes 55 are formed not in the intermediate portion 54, but in a position that overlaps with the left and right thickened portions 53.

[0045] The rear receiving portion 52 is no different from that of the first embodiment. The receiving bracket 5 is positioned so that the rear receiving portion 52 is aligned with the rear visible portion 32 of the frame material 30, and the fixing base portion 51 is overlapped with the recessed portion 31 of the frame material 30. The receiving bracket 5 is then fixed to the frame material 30 by fastening fixing screws 71, which are inserted into two screw insertion holes 55, to a metal reinforcing material 23 embedded in the hollow portion 33 of the frame material 30. After fixing multiple receiving brackets 5 to the appropriate locations on the frame material 30 on all four sides of the frame body 3, the glass unit 4 is placed into the frame body 3 from the front and temporarily placed inside the setting block 21.

[0046] The retaining bracket 6 is basically the same as in the first embodiment, and is configured to have an engaging base 61 that overlaps the depth 31 of the frame material 30, and a front retaining portion 62 that extends from the front edge of the engaging base 61 perpendicular to the engaging base 61 and into the opening surface, in a continuous L-shape when viewed from the side. The engaging base 61 has a flat insertion portion 63 that is inserted into the gap S between the intermediate portion 54 of the fixed base 51 and the depth 31 of the frame material 30, and the thickness of the plate of the insertion portion 63 is approximately the same as the size of the gap S. The front retaining portion 62 has a roughly rectangular front shape and extends in the length direction of the frame material 30 at a height similar to that of the rear receiving portion 52.

[0047] However, in this second embodiment, the metal plate material constituting the retaining bracket 6 is made of a material that is more elastically deformable than in the first embodiment, such as a stainless steel plate for springs. The front retaining portion 62 of the retaining bracket 6 is shaped to be elastically bent at the center in the opening width direction such that the rear side is at a lower angle, and can be deformed into a roughly V shape when viewed from above. To enable this bending deformation, the insertion portion 63 of the engagement base 61 is divided into left and right halves with the center in the opening width direction as the boundary, and the edges on the center side of each left and right portion are notched so that they separate from each other towards the rear. By providing such notches, it is possible to avoid interference between the left and right insertion portions 63 on the center side when the front retaining portion 62 is bent and deformed.

[0048] The width W2 between the two ends of the left and right divided insertion section 63 is set to approximately match the width W3 of the gap S between the intermediate part 54 of the fixing base 51 and the recessed part 31 of the frame material 30, so that it fits comfortably into the gap S. Furthermore, locking pieces 66 are provided protruding from the back side of both ends of the left and right divided insertion section 63 in the direction of the opening width. These locking pieces 66 are flat, rounded rectangular pieces with the same thickness as the insertion section 63, and are provided protruding along the length direction of the frame material 30, with the left and right sides moving away from each other.

[0049] Similar to the first embodiment, the retaining bracket 6 is installed by first placing the glass unit 4 inside the receiving bracket 5 from the front, and then inserting the engaging base 61 into the gap S formed between the middle portion 54 of the receiving bracket 5 and the recessed portion 31 of the frame material 30, also from the front. During installation, the front retaining portion 62 of the retaining bracket 6 is bent into a roughly V-shape when viewed from above, shortening the width W2 of the insertion portion 63, while inserting the insertion portion 63 and the locking piece 66 into the gap S. Once the locking piece 66 is inserted beyond the thickened portion 53 of the receiving bracket 5, the bent state of the front retaining portion 62 is released, and the width W2 of the insertion portion 63 is returned to its original state. Then the locking piece 66 moves in the length direction of the frame material 30 and fits into the gap (engaged portion 56) at the back of the thickened portion 53. In this way, the retaining clip 6 is connected to the receiving clip 5 in a way that prevents it from easily coming off.

[0050] In this second embodiment, the retaining structure for the glass unit 4 also allows the clearance that must be secured in the thickness direction (inward and outward direction of the opening surface) at the overlapping points of the receiving bracket 5 and the retaining bracket 6 to be almost zero, so that they can be joined with high precision and without rattle. The receiving bracket 5 and the retaining bracket 6 can be manufactured by simple punching and bending, so manufacturing costs can be kept down. Furthermore, if the glass unit 4 breaks after installation and needs to be replaced, after removing the pressing edge 22, the retaining bracket 6 can be separated from the receiving bracket 5 by hooking an appropriate tool near the center position in the opening width direction of the front retaining portion 62 of the retaining bracket 6, thereby bending the front retaining portion 62 into a roughly V shape when viewed from above and shortening the width W2 of the insertion portion 63, and pulling out the locking piece 66 from the engaged portion 56.

[0051] In other words, in this second embodiment, the engaging portion 56 is formed by making the depth of the thickened portions 53 formed at both ends of the fixed base 51 smaller than the depth of the fixed base 51, thereby expanding the gap S to the back side of the thickened portions 53; the front pressing portion 62 is shaped so that the central part in the opening width direction can be elastically flexed and deformed such that the back side has a less favorable angle; the insertion portion 63 is divided into left and right sections to avoid interference between the central part when the front pressing portion 62 is flexed and deformed; and the pair of left and right locking pieces 66 are provided protruding from both ends of the insertion portion 63 in directions that are separated from each other along the length direction of the frame material 30, thereby configuring a means for detachably connecting the fixed base 51 and the engaging base 61.

[0052] [Third Embodiment] Figures 11 to 13 show a third embodiment of the invention disclosed in this application. The frame material 30 shown in Figure 11 is the lower frame of the "internal sash structure" that constitutes the sash 2 of a sliding window, just like in Figure 8. The receiving fitting 5 and the retaining fitting 6 in this third embodiment are also formed by bending a metal sheet material such as a stainless steel plate.

[0053] The receiving bracket 5 is formed so as to be continuous in an L-shape when viewed from the side, comprising a fixing base 51 that is overlapped and fixed to the recess 31 of the frame material 30, and a rear receiving portion 52 that extends from the rear edge of the fixing base 51 perpendicular to the fixing base 51 and toward the inside of the opening surface.

[0054] The planar shape of the fixed base 51 and the front shape of the rear receiving portion 52 are similar to those of the receiving bracket 5 in the second embodiment. However, in this third embodiment, the thickened portions 53 provided at both ends of the fixed base 51 are formed to be thicker than those in the first and second embodiments. The thickened portions 53 are not hemming bends that extend from the edge of the fixed base 51 and make them tightly attached to the outside of the opening surface of the fixed base 51. Instead, they are processed into an open hemming bend, or P-bend, shape, where they are folded back in a U-shape, leaving a gap of about one plate thickness between them and the fixed base 51. Therefore, when this fixed base 51 is placed on the recess 31 of the frame material 30, a gap S of about two plate thicknesses of the receiving bracket 5 is formed between the intermediate portion 54 sandwiched between the left and right thickened portions 53 and the recess 31 of the frame material 30. Screw insertion holes 55 are formed at a position that overlaps with these thickened portions 53. In this third embodiment, as in the first embodiment, the depth of the thickened portion 53 may be made to match the depth of the fixed base portion 51.

[0055] Furthermore, in this third embodiment, a folded edge 57 is also formed on the front side of the intermediate portion 54 sandwiched between the left and right thickened portions 53. This folded edge 57 is formed by hemming a folded piece extending from the front edge of the intermediate portion 54 to make it adhere closely to the outside of the opening surface of the intermediate portion 54. This folded edge 57 is not formed over the entire width of the intermediate portion 54 (in the opening width direction of the frame 3), but rather over a portion of the intermediate portion 54 (approximately half to three-quarters of the width of the intermediate portion 54) and is positioned to one side, either left or right. Therefore, when viewing the fixing base 51 fixed to the depth portion 31 of the frame material 30 from the front, a gap S the size of one plate thickness is formed between the fixing base 51 and the depth portion 31 in the area where the folded edge 57 is formed, and a gap S the size of two plate thicknesses is formed in the area where the folded edge 57 is not formed (see Figure 13). In this third embodiment, the portion where the folded edge 57 is formed becomes the engaged portion for connecting the retaining clip 6, which will be described later.

[0056] The rear receiving portion 52 is no different from that of the first and second embodiments. Similar to the first and second embodiments, the receiving bracket 5 is positioned so that the rear receiving portion 52 is aligned with the rear visible portion 32 of the frame material 30, and the fixing base portion 51 is overlapped with the recessed portion 31 of the frame material 30. Fixing screws 71, which are inserted into two screw insertion holes 55, are fastened to a metal reinforcing material 23 embedded in the hollow portion 33 of the frame material 30, thereby fixing it to the frame material 30. After fixing multiple receiving brackets 5 to appropriate locations on the frame material 30 on all four sides, the glass unit 4 is placed in the frame body 3 from the front side and temporarily placed inside the setting block 21.

[0057] The retaining bracket 6 is basically configured in the same way as in the first and second embodiments, with an engaging base 61 that overlaps the depth 31 of the frame material 30, and a front retaining portion 62 that extends from the front edge of the engaging base 61 perpendicular to the engaging base 61 and into the opening surface, both connected in an L-shape when viewed from the side. The engaging base 61 has a flat insertion portion 63 that is inserted into the gap S between the intermediate portion 54 of the fixed base 51 and the depth 31 of the frame material 30, and the front retaining portion 62 has a roughly rectangular front shape and extends in the length direction of the frame material 30 at a height similar to that of the rear receiving portion 52, also in the same way as in the first and second embodiments.

[0058] However, in this third embodiment, the width W4 of the engagement base 61 in the opening width direction is smaller than in the first and second embodiments, and is set to a dimension that fits within the width W5 of the portion of the intermediate part 54 of the receiving bracket 5 where the folded edge 57 is not formed. Furthermore, a folded edge 67 is also formed on the inner edge of the insertion part 63. This folded edge 67 is formed so as to be tightly pressed against the inner surface of the opening of the insertion part 63 by hemming the inner edge of the insertion part 63, and this becomes a locking edge for connecting to the receiving bracket 5. Therefore, in this third embodiment, the locking edge has a thickness equivalent to two plates.

[0059] Similar to the first and second embodiments, the retaining bracket 6 is attached by inserting the engaging base 61 into the gap S formed between the intermediate portion 54 of the receiving bracket 5 and the recessed portion 31 of the frame material 30, also from the front side, after the glass unit 4 has been placed inside the receiving bracket 5 from the front side. The attachment is done by inserting the engaging base 61 of the retaining bracket 6 into the gap S, which is the thickness of two plates and does not have a folded edge (engaged portion) formed in the intermediate portion 54 of the receiving bracket 5, then sliding the retaining bracket 6 along the length direction of the frame material 30 into the gap S, which is the thickness of one plate, and engaging the locking edge, which is the thickness of two plates and formed on the rear edge of the engaging base 61, with the engaged portion, which is formed on the front edge of the fixing base 51. In this way, the retaining bracket 6 is connected to the receiving bracket 5 in a way that prevents it from easily coming off. In the example configuration, the locking edge on the retaining bracket 6 side extends across the entire width of the engaging base 61, but the locking edge may be provided only on a portion of the engaging base 61 in the lateral direction. Furthermore, the engaged portion on the receiving bracket 5 side and the locking edge on the retaining bracket 6 side may each be divided and provided at multiple locations.

[0060] In this third embodiment, the retaining structure for the glass unit 4 also allows for a highly precise and rattle-free connection because the clearance required in the thickness direction (inward and outward direction of the opening surface) at the overlapping points of the receiving bracket 5 and the retaining bracket 6 can be reduced to almost zero. The receiving bracket 5 and the retaining bracket 6 can be manufactured using only simple punching and bending processes, thus reducing manufacturing costs. Furthermore, even if the glass unit 4 breaks after installation and needs to be replaced, after removing the trim 22, the retaining bracket 6 can be separated from the receiving bracket 5 by sliding it along the length direction of the frame material 30 in the opposite direction to how it was installed.

[0061] In other words, in this third embodiment, the engagement and disengagement means for detachably connecting the fixed base 51 and the engagement base 61 is configured by an engagement portion (folded edge 57) provided on the front edge of the intermediate portion 54 of the fixed base 51, extending over a portion in the opening width direction of the intermediate portion 54; an engagement base 61 formed to a width that fits into the portion of the intermediate portion 54 where the engagement portion is not formed; and a locking edge (folded edge 67) provided on the rear edge of the insertion portion 63 of the engagement base 61, which is inserted into a gap S where the engagement portion is not formed and then moves to the side where the engagement portion is provided to engage with the engagement portion.

[0062] Although the glass unit retention structure disclosed in this application has been described above with three examples of embodiments, the technical scope of the invention disclosed in this application should not be interpreted restrictively by the examples of embodiments, but rather conceptually based on the description in the claims. The names of the components used in the claims and specification are for convenience to make the invention easier to understand concretely, and the names do not unnecessarily limit the concept or properties of the components. When implementing the invention disclosed in this application, the detailed shape, dimensions, structure, material, quantity, combination form with other elements, relative positional relationship, etc. of components not specifically specified in the claims may be modified as appropriate within the scope of using an operating principle substantially equivalent to that of the exemplary form, or within the scope of obtaining an effect substantially equivalent to or better than that of the exemplary form. [Explanation of Symbols]

[0063] 1 frame 10 Frame material 2 Shoji 21 Setting Blocks 22 Pressed edge 23 Metal reinforcement 3 frame 30 Frame material 31 Estimated portion 32 Rear side visible section 33 Hollow part 34 Hollow part 35 Hollow part 36 Overhang edge 37 Groove 38 Rear bead material 4 Glass Units 41 Heat-resistant tempered glass sheet 42 Non-heat-resistant glass plate 43 Non-heat-resistant glass plate 44 Spacers 45 Spacers 5. Mounting bracket 51 Fixed base 52 Rear receiving part 53 Thickened section 54 Middle section 55 Screw insertion holes 56 Engaged portion 57 Folded edge (engaged part) 6. Retaining clip 61 Engagement base 62 Front side retaining part 63 Insertion part 64 Screw engagement part 641 Taking out section 642 Locking piece 643 Retaining claw 66 Locking piece 67 Folded edge (locking edge) 71 Fixing screws 9. Switching device S Gap

Claims

1. A glass unit is placed within the opening of a frame body formed by assembling frame members on all four sides, from either the indoor or outdoor side, and the peripheral edge of the glass unit is held in place by being sandwiched between a receiving fitting fixed to each of the frame members and a retaining fitting connected to each of the receiving fittings, The frame material has an inner circumferential surface that is continuous in a substantially L-shape in cross-section, comprising a projection portion that defines the outer edge of the opening surface perpendicular to the opening surface of the frame body, and a rear projection portion that extends from either the indoor or outdoor side of the projection portion into the inner surface of the opening surface of the frame body. The aforementioned receiving bracket and retaining bracket are each formed by bending a single sheet of metal. The receiving bracket comprises a fixing base that is fixed by overlapping it with the recessed portion of the frame material, and a rear receiving portion that extends from the other edge of the fixing base perpendicular to the fixing base and toward the inside of the opening surface of the frame body, and is positioned along the rear visible portion of the frame material. Thickened portions are provided on the outer side of the opening surface at both ends of the fixing base in the opening width direction of the frame, and when the fixing base is placed on the recess, the intermediate portion sandwiched between the two thickened portions separates from the recess, and a gap is formed between the intermediate portion and the recess. The retaining clip comprises an engaging base including a flat insertion portion that is inserted into the gap from one side and overlapped with the recessed portion, and a front retaining portion that extends from the edge of the engaging base on one side toward the inside of the opening surface of the frame perpendicular to the engaging base, A means for detaching and engaging the fixing base and the engaging base is provided at the location where the fixing base of the receiving bracket and the engaging base of the retaining bracket overlap each other, by moving at least a portion of the retaining bracket in the longitudinal direction of the frame material. A glass unit retention structure characterized by the following features.

2. In the glass unit retention structure described in claim 1, The size of the gap and the thickness of the engagement base are set to be substantially the same, The aforementioned engagement / disengagement means, The intermediate portion of the fixing base has a plurality of screw insertion holes formed parallel to the length direction of the frame material, Multiple fixing screws are inserted into the screw insertion holes and fastened to the recessed portion of the frame material, Multiple screw engagement portions provided on the other side of the engagement base, It consists of, The screw engagement portion has a shape in which a protruding portion that extends from the insertion portion toward the other side and a locking piece that extends from the protruding end of the protruding portion in the direction of the length of the frame material are continuous. By inserting the screw engagement portion into the side of each fixing screw and sliding the retaining bracket in the length direction of the frame material, the recess formed between the locking piece and the insertion portion is fitted onto the fixing screw. A glass unit retention structure characterized by the following features.

3. In the glass unit retention structure described in claim 2, A retaining claw is formed on one end edge of the locking piece, projecting toward the insertion portion. A glass unit retention structure characterized by the following features.

4. In the glass unit retention structure described in claim 1, The size of the gap and the thickness of the engagement base are set to be substantially the same, The aforementioned engagement / disengagement means, The engaged portion is formed by making the depth of the thickened portion formed at both ends of the fixed base smaller than the depth of the fixed base, thereby extending the gap to the other side of the thickened portion, The front side retaining portion is shaped so that the central part of the frame in the opening width direction can be elastically flexed and deformed such that the other side becomes a less favorable angle, The insertion portion is divided into left and right sections to prevent interference between them when the front pressing portion undergoes bending deformation, A pair of left and right locking pieces are provided protruding from both ends of the insertion portion in the opening width direction of the frame body, in directions that are separated from each other along the length direction of the frame material, It consists of, By bending and deforming the front retaining portion to shorten the width of the engaging base, the engaging base is inserted into the gap, and once the locking piece is inserted beyond the thickened portion to the other side, the bending deformation of the front retaining portion is released, and the locking piece is moved in the length direction of the frame material, thereby engaging the engaged portion. A glass unit retention structure characterized by the following features.

5. In the glass unit retention structure described in claim 4, The mounting bracket is secured by fastening screws, which are inserted into screw insertion holes formed at the position where the fixing base and the thickened portion overlap, and then fastened to the recessed portion. A glass unit retention structure characterized by the following features.

6. In the glass unit retention structure described in claim 1, The aforementioned engagement / disengagement means, The engaging portion provided on one edge of the intermediate portion of the fixed base, A locking edge provided on the other edge of the insertion portion of the engagement base, It consists of, The engaged portion is formed by bending a folded piece extending from one edge of the intermediate portion so as to be in close contact with the outside of the opening surface of the intermediate portion, over a portion of the intermediate portion in the direction of the opening width, The size of the gap formed between the engaged portion and the recessed portion of the frame material is set to substantially match the plate thickness of the insertion portion in the engagement base. The locking edge is formed by bending a folded piece extending from the other edge so that it is in close contact with the inside of the opening surface of the insertion portion, The thickness of the locking edge is set to be smaller than the portion in the gap between the intermediate portion and the recessed portion where the engaged portion is not formed, and larger than the portion where the engaged portion is formed. The width of the engagement base in the opening width direction is set to be smaller than the width of the portion in the middle of the receiving bracket where the engagement portion is not formed. By inserting the engagement base into the gap in the portion where the engagement portion is not provided and sliding it toward the side where the engagement portion is provided, the locking edge engages with the engagement portion. A glass unit retention structure characterized by the following features.

7. In the glass unit retention structure described in claim 6, The mounting bracket is secured by fastening screws, which are inserted into screw insertion holes formed at the position where the fixing base and the thickened portion overlap, and then fastened to the recessed portion. A glass unit retention structure characterized by the following features.

Images