Mullion Sleeve for Connecting Mullions at Specific Angles

Abstract

The present invention relates to a mullion sleeve for connecting two mullions arranged at different angles in a curtain wall system for construction. More specifically, the invention relates to a mullion sleeve for connecting mullions at a specific angle, wherein two sleeve bodies are inserted in a sliding manner while making surface contact with the inner circumference of each mullion, and a connecting portion consisting of a projection and a groove formed at one end of the two sleeve bodies is slidably connected in the transverse direction, thereby enabling the two mullions to be connected at a specific angle without a separate electric welding process.

Description

Technology Field

[0001] The present invention relates to a mullion sleeve for connecting two mullions arranged at different angles in a curtain wall system for construction. More specifically, the invention relates to a mullion sleeve for connecting mullions at a specific angle, wherein two sleeve bodies are inserted in a sliding manner while making surface contact with the inner circumference of each mullion, and a connecting portion consisting of a projection and a groove formed at one end of the two sleeve bodies is slidably connected in the transverse direction, thereby enabling the two mullions to be connected at a specific angle without a separate electric welding process. Background Technology

[0003] A curtain wall is a non-load-bearing exterior system that does not contribute to the building's own weight and serves as a representative architectural component for the exterior walls of high-rise buildings. A curtain wall is constructed by forming a grid-like frame consisting of vertical members called mullions and horizontal members called transoms, both made of extruded aluminum profiles, with glass panels, spandrel panels, and insulation panels inserted between the grids. Mullions are key components that transfer the curtain wall's own weight and wind loads to the slab or structural frame; they are generally manufactured from extruded aluminum profiles and feature a cross-sectional shape with an internal hollow section.

[0004] Modern buildings are increasingly moving away from simple straight exteriors and adopting complex shapes such as diagonal lines, curves, and polygons. Consequently, it is becoming common for vertical mullions to be bent at specific angles rather than arranged in a straight line. In these bent sections, it is necessary to structurally and robustly connect two mullions according to the bending angle, and the component used for this purpose is the mullion sleeve. The mullion sleeve is a connecting member that is partially inserted into the inner surface of each mullion to connect them integrally, and it performs a structural role in transmitting bending moments and shear forces caused by wind load and self-weight between the two mullions.

[0005] In order to manufacture such mullion sleeves, conventional technology used methods of electric welding pre-fabricated square tube sleeves and electric welding bent sleeves.

[0006] The first conventional method involves cutting and using commercially available standard galvanized steel square tubes (e.g., 45mm × 75mm). The contractor cuts two prefabricated square tubes into four sides according to the mullion bending angle measured at the site, then butts the cut surfaces together and joins them by electric welding to complete a bent sleeve, which is then inserted into the inner surface of both mullions.

[0007] That is, to produce an 18° mullion using 45mm × 75mm steel square tubes, the tubes can be cut at a 36° angle (Fig. 1 (a)) and electrically welded together (Fig. 1 (b)); to produce a 30° mullion, the tubes can be cut at a 30° angle (Fig. 2 (a)) and electrically welded together (Fig. 2 (b)); and to produce a 46° mullion, the tubes can be cut at a 22° angle (Fig. 3 (a)) and electrically welded together (Fig. 3 (b)). Then, the sleeve produced in this way is inserted into the mullion as shown in Fig. 4 (a), and when inserted, it is positioned with a cross-section as shown in Fig. 4 (b).

[0008] However, this method has the following numerous problems.

[0009] First, since prefabricated square tubes are standard components with fixed specifications, they often do not exactly match the inner circumferential dimensions of the mullion. This results in dimensional tolerances between the sleeve and the mullion, which leads to reduced rigidity of the joint and decreased structural reliability (see Fig. 4 (b)).

[0010] Second, after electric welding is performed with the cut surfaces butted together, the weld bead protrudes from the surface, so in order to insert the sleeve into the inner circumference of the mullion, post-processing steps such as surface grinding and surface finishing must be performed (see (b) of FIGS. 1 to 3). This increases working time and causes dust and noise.

[0011] Third, since the quality of electric welding depends heavily on the welder's skill level, there is significant variation in quality among workers, and if welding defects (undercuts, porosity, cracks, etc.) occur, they have a critical impact on structural safety.

[0012] Fourth, since the bending angle required on-site varies from building to building, all sleeves must be custom-made in the order of order → cutting → welding → delivery, which results in a long lead time and makes it difficult to respond immediately on-site.

[0013] Fifth, since aluminum mullions and iron sleeves have different coefficients of thermal expansion (aluminum: approximately 23×10⁻⁶ -6 / ℃, Iron: approx. 12×10 -6 There is a problem in which micro-displacements between two members occur repeatedly due to temperature changes (e.g., / ℃), resulting in friction noise between dissimilar materials and damage to the joint.

[0014] The second conventional method involves bending a rolled steel plate to form a sleeve shape with a square cross section (e.g., 55 mm × 82 mm), joining the joints formed along the bending lines by electric welding, cutting the sides according to the bending angle, and then joining the cut surfaces again by electric welding.

[0015] That is, rolled steel plates are formed into 55mm × 82mm and joined by electric welding. Then, to produce an 18° mullion, square tubes can be cut at a 36° angle (Fig. 5 (a)) and electric welded together (Fig. 5 (b)). To produce a 30° mullion, square tubes can be cut at a 30° angle (Fig. 6 (a)) and electric welded together (Fig. 6 (b)). To produce a 46° mullion, square tubes can be cut at a 22° angle (Fig. 7 (a)) and electric welded together (Fig. 7 (b)). Then, the sleeve produced in this way is inserted into the mullion as shown in Fig. 8 (a), and when inserted, it is arranged in a cross-section as shown in Fig. 8 (b).

[0016] This method has the advantage of allowing for a wider variety of sleeve cross-sectional dimensions compared to the standard square tube method, but it has the following additional problems.

[0017] First, since a multi-stage process ranging from bending, cutting, welding, and galvanizing of rolled steel sheets is required, the delivery lead time becomes longer.

[0018] Second, while galvanizing is essential to prevent steel corrosion, welding is virtually impossible after galvanizing due to issues such as damage to the plating layer and the generation of plating waste gases; therefore, the process sequence of "galvanizing after welding" must be strictly followed. This imposes an additional constraint where the delivery time depends on the operating schedule of the plating equipment.

[0019] Third, the burden of environmental pollution is increased because pickling and plating bath wastewater is generated during the zinc plating process.

[0020] Fourth, just like the first conventional technology, the need for post-weld treatment, dependence on welder skill, and noise problems caused by differences in thermal expansion between dissimilar materials remain (see (b) in FIGS. 5 to 7).

[0021] Therefore, there has been a demand for the development of technology capable of resolving the problems caused by such conventional technology. Prior art literature

[0023] U.S. Patent No. 6,226,940 (Registered May 8, 2001) - Mullion Connection System The problem to be solved

[0024] The present invention aims to solve the aforementioned problems, and the first objective of the present invention is to provide a mullion sleeve composed of a weldless joining structure that can completely eliminate the electric welding process and associated post-processing processes such as surface grinding and surface finishing when connecting two mullions at a specific angle.

[0025] The second objective of the present invention is to provide a mullion sleeve in which two sleeve bodies can be firmly integrated at a specific angle without a separate fastener or heating process by having a connecting part, consisting of a groove and a projection formed protruding from one end of each of the two sleeve bodies, slide-connected in the transverse direction.

[0026] The third objective of the present invention is to provide a mullion sleeve that minimizes dimensional tolerances and poor fit between the sleeve and the mullion by having a cross-sectional shape such that each sleeve body can be slidably inserted while in surface contact with the inner circumference of the mullion.

[0027] The fourth objective of the present invention is to provide a mullion sleeve that effectively eliminates minute gaps in the joints despite being a weldless joint structure by reinforcing the tightness of the joints by press-fitting a wedge member into a wedge groove formed in the joint.

[0028] The fifth objective of the present invention is to provide a mullion sleeve that ensures uniform bonding quality without relying on worker skill level and enables immediate on-site supply through the pre-production and inventory of standardized sleeves. means of solving the problem

[0031] The present invention, for achieving the above objective, is a mullion sleeve for connecting a first mullion and a second mullion arranged at a specific angle, wherein the mullion sleeve comprises a first sleeve body having a cross-section that is slidably inserted while in surface contact with the inner circumference of the first mullion, and a second sleeve body having a cross-section that is slidably inserted while in surface contact with the inner circumference of the second mullion and connected to the first sleeve body at a specific angle, and the first and second sleeve bodies are mutually coupled at a specific angle by means of a first coupling part having a groove formed protruding from one end of the first sleeve body and formed such that the inner portion widens or the angle changes with respect to the entrance side formed in the protruding direction, and a second coupling part having a projection formed protruding from one end of the second sleeve body and inserted transversely into the groove of the first coupling part.

[0032] In addition, the first and second coupling parts may be configured with a shape having a constant cross-section in the longitudinal direction so that they can be slidably coupled to each other at one end of each sleeve body.

[0033] At this time, in order to strengthen the contact between the first joint and the second joint, a first semicircular wedge groove is formed in the first joint and a second semicircular wedge groove is formed in the second joint, and a wedge can be press-fitted into the first wedge groove and the second wedge groove.

[0034] In addition, at one end of each sleeve body, the first coupling part and the second coupling part are arranged parallel to each other, and at the other end, the second coupling part and the first coupling part are arranged parallel to each other in order to be coupled to the first and second coupling parts of the first end, respectively.

[0035] In addition, a dovetail groove is formed in the first coupling part such that the space of the inner part is relatively wider than the inlet side, and a dovetail projection that is inserted into the dovetail groove may be formed in the second coupling part. Effects of the invention

[0037] According to the mullion sleeve of the present invention, since the two sleeve bodies are integrated by a transverse sliding connection of a joint part consisting of a protrusion and a groove, the conventional electric welding process and post-processing processes such as surface grinding and surface finishing are completely eliminated.

[0038] In addition, according to the present invention, the groove of the first coupling part is formed such that the inner part widens or the angle changes with respect to the entrance side, so coupling and separation are possible in the transverse direction (slide direction), but separation is restricted in the longitudinal direction (direction perpendicular to the slide direction) due to shape interlocking. Accordingly, there is an advantage of ensuring high resistance to longitudinal detachment despite being a weldless coupling.

[0039] In addition, according to the present invention, since the first and second connecting parts are configured to have a shape with a constant cross-section in the longitudinal direction, it is easy to integrally mold the sleeve body using an aluminum extruded profile, and there is an advantage that the shape interlocking is uniformly maintained throughout the entire connecting length.

[0040] And according to the present invention, by press-fitting a wedge member into a wedge groove formed in the joint part, the fine gap remaining after joining is eliminated, and the remaining degree of freedom in the sliding direction (lateral direction) is constrained, thereby having the effect of completely fixing the joint part.

[0041] In addition, according to the present invention, by adopting an asymmetric cross configuration in which a first coupling part and a second coupling part are arranged parallel to each other at one end of each sleeve body and a second coupling part and a first coupling part are arranged parallel to each other at the other end, there is an advantage of ensuring excellent compatibility and coupling reliability, in which both sides are firmly coupled simply by coupling two sleeve bodies of the same shape facing each other.

[0042] Furthermore, according to the present invention, since the sleeve body can be manufactured from an aluminum extruded profile, a bonding of the aluminum mullion and the same material is formed, thereby preventing noise and deformation caused by the difference in thermal expansion between dissimilar materials, and there is an advantage that a separate plating process is unnecessary due to the inherent corrosion resistance of aluminum.

[0043] In addition, according to the present invention, since it does not rely on the skill level of the worker, uniform joining quality is ensured, and there is an effect that immediate on-site supply is possible through the pre-production and stocking of standardized sleeves. Brief explanation of the drawing

[0045] FIG. 1 is a drawing illustrating a method of joining mullions at a bending angle of 18° according to the first prior art, FIG. 2 is a drawing illustrating a method of joining mullions at a bending angle of 30° according to the first prior art, FIG. 3 is a drawing illustrating a method of joining mullions at a bending angle of 46° according to the first prior art, FIG. 4 is a drawing illustrating a state in which mullions are connected in a manner according to the first prior art. FIG. 5 is a drawing illustrating a method of joining mullions at a bending angle of 18° according to the second prior art, FIG. 6 is a drawing illustrating a method of joining mullions at a bending angle of 30° according to the second prior art. FIG. 7 is a drawing illustrating a method of joining mullions at a bending angle of 46° according to the second prior art. FIG. 8 is a drawing illustrating a state in which mullions are connected in a manner according to the second prior art. FIG. 9 is a perspective view illustrating an extruded profile according to one embodiment of the present invention, FIG. 10 is a perspective view of a mullion sleeve according to the present embodiment, FIG. 11 is an exploded perspective view of a mullion sleeve according to the present embodiment, FIG. 12 is a cross-sectional view illustrating an extruded profile according to a modified example of the present invention, FIG. 13 is a drawing illustrating a method of joining mullions at a bending angle of 18° according to the present embodiment. FIG. 14 is a drawing illustrating a method of joining mullions at a bending angle of 30° according to the present embodiment. FIG. 15 is a drawing illustrating a method of joining mullions at a bending angle of 46° according to the present embodiment. FIG. 16 is a drawing illustrating the state of connecting mullions in the manner according to the present embodiment. Specific details for implementing the invention

[0046] Hereinafter, the configuration and operation method according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0048] First, the term 'direction' used in this specification is defined as follows.

[0050] "Transverse direction (L1, slide direction)": The direction in which the first coupling part and the second coupling part slide together, which is identical to the longitudinal direction in which the coupling part formed at one end of each sleeve body extends in a straight line.

[0051] "Longitudinal direction (L2)": Perpendicular to the transverse direction (L1), and is the direction in which the projection of the second coupling part is to come out of the groove of the first coupling part, and coincides with the direction in which the first coupling part and the second coupling part protrude from one end of the sleeve body.

[0052] "Width direction (L3)": This is a direction perpendicular to the transverse direction (L1), which is the length direction in which the joint extends in a straight line.

[0054] Next, a mullion sleeve according to the present invention will be described.

[0055] FIG. 9 is a perspective view illustrating an extruded profile according to one embodiment of the present invention, FIG. 10 is a perspective view of a mullion sleeve according to the present embodiment, and FIG. 11 is an exploded perspective view of a mullion sleeve according to the present embodiment.

[0056] As described above, a mullion sleeve (100) according to one embodiment of the present invention comprises a first sleeve body (110) and a second sleeve body (120). The first sleeve body (110) has a cross-section that is slidably inserted while making surface contact with the inner surface of a first mullion positioned at a specific angle, and the second sleeve body (120) has a cross-section that is slidably inserted while making surface contact with the inner surface of a second mullion while being connected to the first sleeve body (110) at a specific angle.

[0057] The first sleeve body (110) and the second sleeve body (120) may be formed from an aluminum extruded profile, and their cross-sectional dimensions may be 55 mm × 170 mm in one embodiment, and may be varied and applied in accordance with the inner circumferential dimensions of the mullion.

[0058] A first coupling part (130) is formed protruding in the longitudinal direction (L2) at one end of the first sleeve body (110), and a second coupling part (140) is formed protruding in the longitudinal direction (L2) at one end of the second sleeve body (120). The first coupling part (130) has a groove (131) or a groove (132) formed along the protruding longitudinal direction (L2) such that the inner part widens with respect to the entrance side, and the second coupling part (140) has a projection (141, 142) that is inserted in the transverse direction (L1) into the groove of the first coupling part (130).

[0059] Here, the groove formed in the first coupling part (130) of the present invention is sufficient if it has a shape that prevents the projection of the second coupling part (140) inserted therein in the transverse direction from coming out in the longitudinal direction (L2), and the present specification exemplifies cross-sectional shapes that satisfy this function in the following two types.

[0060] The first type is a shape in which the cross-section of the groove (131) formed in the first coupling part (130), as shown in FIG. 9, is formed such that the inner width is wider than the inlet width. That is, the cross-sectional width gradually or stepwise expands as it goes inward from the longitudinal (L2) inlet side of the groove, and a representative example of this is the dovetail cross-section described later.

[0061] In this cross-sectional shape, when the projection of the second coupling part (140) that is slidably inserted in the transverse direction (L1) attempts to come out in the longitudinal direction (L2), the wide portion of the projection catches on the narrow entrance of the groove, thereby preventing it from coming out.

[0062] As a preferred embodiment for the first type, the groove (131) formed in the first coupling part (130) can be implemented as a dovetail groove (131a). That is, a dovetail groove (131a) is formed in the first coupling part (130) so that the space of the inner part is relatively wider than the entrance side, and a dovetail projection (141a) is formed in the second coupling part (140) to be inserted in the transverse direction (L1) into the dovetail groove.

[0063] The cross-section of the dovetail groove has a trapezoidal shape, wherein the shorter side of the trapezoid is located on the longitudinal (L2) entrance side and the longer side is located on the inner bottom surface of the groove. Correspondingly, the dovetail projection has a cross-section in which the shorter side of the trapezoid is located on the main body side of the second coupling part (140) and the longer side is located on the free end side.

[0064] This dovetail shape provides excellent coupling stability, allowing for slide insertion and withdrawal in the transverse direction (L1), but in the longitudinal direction (L2), the trapezoidal wide portion catches on the narrow entrance portion, completely preventing detachment through the interlocking shape.

[0065] Additionally, the second type is a shape in which the cross-section of the groove (132) formed in the first coupling part (130), as illustrated in FIG. 12, proceeds inward from the longitudinal (L2) entrance side, but the direction of progress is bent and changed to another direction along the way. For example, a cross-section in the shape of a T-shape, an L-shape, a J-shape, a right angle, or a modified shape thereof, in which the groove bends and extends in the transverse direction (L1) or a direction close thereto after entering a certain depth in the longitudinal direction (L2), corresponds to this type.

[0066] In this cross-sectional shape, even if the internal space of the groove is not necessarily wider than the width of the entrance side, as the groove (132) bends in the middle and the direction of travel changes, the straight path for the projection of the second coupling part (140) inserted in the transverse direction (L1) to come out in the longitudinal direction (L2) is blocked, and thus the escape is prevented. That is, the escape of the projection (142) in the longitudinal direction (L2) is restricted by the step or stopper formed by the bent shape of the groove.

[0067] In this case, the projection of the second coupling part (140) is also formed to have a bent cross-sectional shape corresponding to the groove of the first coupling part (130), so that when sliding in the transverse direction (L1), it is coupled along the path of the groove, and in the longitudinal direction (L2), separation is restricted by the shape interlocking.

[0068] Both of these first and second types perform the common function of "limiting the longitudinal displacement of the projection of the second coupling part inserted transversely into the groove of the first coupling part by shape interlocking." This corresponds to a key function that enables the two sleeve bodies (110, 120) to be firmly integrated at a specific angle despite the weldless coupling structure in the present invention.

[0069] Meanwhile, the first coupling part (130) and the second coupling part (140) are formed to extend in a straight line from one side to the other at one end of each sleeve body (110, 120), and are configured to continuously maintain the same cross-sectional shape along the length direction (transverse direction L1).

[0070] That is, the first coupling part (130) and the second coupling part (140) are configured with a shape having a constant cross-section in the longitudinal direction so that they can slide together at one end of the sleeve body (110, 120), and as a result, both coupling parts are engaged with the same shape throughout the entire length of the slide direction (L1), thereby ensuring uniform restriction of longitudinal deviation due to shape engagement throughout the entire length of the coupling.

[0071] In addition, since the sleeve body (110, 120) and the first connecting part (130) and the second connecting part (140) protruding from one end thereof all have a constant cross-section in the longitudinal direction, integral molding through an aluminum extrusion die is possible, and the sleeve body and the connecting part can be manufactured as a single unit without separate cutting, welding, or assembly processes.

[0072] In addition, in a preferred embodiment of the present invention, a first coupling part (130) and a second coupling part (140) are arranged in parallel at one end of each sleeve body (110, 120), and at the other end, a second coupling part (140') and a first coupling part (130') are arranged in parallel in order to be coupled to the first coupling part (130) and the second coupling part (140) of the first end, respectively.

[0073] That is, if a first coupling part (groove) is positioned on the left and a second coupling part (protrusion) is positioned on the right when viewed from one end of the sleeve body (110) in the longitudinal direction (L1), then when viewed from the other end of the same sleeve body (110), the left and right sides are arranged in a cross shape such that the second coupling part (protrusion) is positioned on the left and the first coupling part (groove) is positioned on the right.

[0074] Due to this cross-arrangement structure of one end and the other end, simply by placing two sleeve bodies of the same shape facing each other, a first coupling part (groove) formed on one end of a sleeve body is coupled with a second coupling part (protrusion) formed on the other end of a sleeve body, and simultaneously, the second coupling part (protrusion) formed on one end of a sleeve body is coupled with the first coupling part (groove) formed on the other end of a sleeve body. As a result, the groove-protrusion pairs of the two sleeve bodies are mutually coupled on both the left and right sides, thereby simultaneously ensuring component compatibility and coupling reliability.

[0075] Meanwhile, in order to further strengthen the degree of contact between the first coupling part (130) and the second coupling part (140), a first wedge groove (133) in the shape of a semicircle may be formed in the first coupling part (130), and a second wedge groove (143) in the shape of a semicircle may be formed in the second coupling part (140). The first wedge groove (133) and the second wedge groove (143) are formed in positions facing each other when the coupling part is slid coupled, so that the two wedge grooves combine to form a wedge receiving space that is substantially circular or close to an elliptical shape.

[0076] A wedge (150) is inserted into the wedge receiving space formed by the first wedge groove (133) and the second wedge groove (143) in a press-fit manner. The wedge (150) may be a rod-shaped member made of an aluminum extruded profile or a piece, and its cross-sectional shape has a shape (e.g., a circular shape or a shape close thereto) corresponding to the wedge receiving space formed by combining the first wedge groove (133) and the second wedge groove (143).

[0077] As the wedge (150) is press-fitted into the wedge receiving space, ① the remaining gap between the first joint (130) and the second joint (140) is eliminated, ② the remaining degree of freedom in the sliding direction (L1) of the joint is constrained so that the joint is completely fixed, and ③ the adhesion force of the joint is continuously maintained within the elastic deformation range of the aluminum extruded profile.

[0079] The mullion connection construction using a mullion sleeve according to one embodiment of the present invention is performed in the following order.

[0080] First, the bending angle of the mullion (angle exceeding 90°, a°) is measured on-site, and based on this angle, the cutting angle (b°) for cutting the aluminum extruded profile is calculated using the following mathematical formula.

[0082]

[0084] Accordingly, to produce a mullion with a bending angle of 18°, the extruded profile is cut at a cutting angle of 36° (Fig. 13 (a)), to produce a mullion with a bending angle of 30°, the extruded profile is cut at a cutting angle of 30° (Fig. 14 (a)), and to produce a mullion with a bending angle of 46°, the extruded profile is cut at a cutting angle of 22° (Fig. 15 (a)) to produce the first sleeve body and the second sleeve body.

[0085] At this time, since the first connecting part and the second connecting part are formed in order at one end of each sleeve body and the second connecting part and the first connecting part are formed in order at the other end, the first sleeve body (110) and the second sleeve body (120) are placed facing each other according to the bending angle, and the first connecting part (130) on one side and the second connecting part (140) on the other side are connected in a sliding manner along the transverse direction (L1). Through this, a mullion sleeve with a bending angle of 18° (Fig. 13 (b)), a mullion sleeve with a bending angle of 30° (Fig. 14 (b)), and a mullion sleeve with a bending angle of 46° (Fig. 15 (b)) are manufactured.

[0086] In this embodiment, a dovetail groove is formed in the first coupling part and a dovetail projection that is inserted into the dovetail groove is formed in the second coupling part, so the first coupling part and the second coupling part are coupled as the dovetail projection is inserted into the dovetail groove.

[0087] When the first coupling part and the second coupling part are joined, the first semicircular wedge groove formed in the first coupling part and the second semicircular wedge groove formed in the second coupling part face each other to form a space with a circular cross-section. A wedge is press-fitted into the first wedge groove and the second wedge groove in this space to eliminate the remaining play of the coupling part (see FIG. 10).

[0088] The connection of both mullions is completed by sliding the integrated mullion sleeve (100) in this manner onto the inner surface of the first mullion (M1) and the second mullion (M2), as shown in FIG. 16.

[0090] The rights of the present invention are not limited to the embodiments described above but are defined by what is stated in the claims, and it is obvious that a person skilled in the art may make various modifications and adaptations within the scope of the rights described in the claims. Explanation of the symbols

[0092] 100 : Mullion Sleeves 110: 1st sleeve main body 120: 2nd sleeve main body 130: First connecting part 131, 132: Groove 131a : Dovetail groove 133 : First wedge groove 140: Second connecting part 141, 142: Protrusions 141a: Dovetail projection 143: Second wedge groove 150 : Wedge M1: 1st mullion M2: 2nd mullion

Claims

Claim 1 A mullion sleeve for connecting a first mullion and a second mullion arranged at a specific angle, wherein the mullion sleeve comprises a first sleeve body having a cross-section that is slidably inserted while in surface contact with the inner circumference of the first mullion, and a second sleeve body having a cross-section that is slidably inserted while in surface contact with the inner circumference of the second mullion and connected to the first sleeve body at a specific angle, wherein the first and second sleeve bodies are mutually coupled at a specific angle by means of a first coupling part having a groove formed protruding from one end of the first sleeve body and formed such that the inner portion widens or the angle changes with respect to the entrance side formed in the protruding direction, and a second coupling part having a projection formed protruding from one end of the second sleeve body and inserted transversely into the groove of the first coupling part. Claim 2 A mullion sleeve for connecting mullions at a specific angle, characterized in that, in claim 1, the first connecting part and the second connecting part are configured to have a shape having a constant cross-section in the longitudinal direction so as to be mutually slide-connected at one end of each sleeve body. Claim 3 A mullion sleeve for connecting mullions at a specific angle, characterized in that, in order to strengthen the close contact between the first and second connecting parts, a first semicircular wedge groove is formed in the first connecting part and a second semicircular wedge groove is formed in the second connecting part, and a wedge is press-fitted into the first wedge groove and the second wedge groove. Claim 4 A mullion sleeve for connecting mullions at a specific angle, characterized in that, in claim 2 or 3, at one end of each sleeve body, the first coupling part and the second coupling part are arranged parallel to each other, and at the other end, the second coupling part and the first coupling part are arranged parallel to each other so as to be connected to the first and second coupling parts of the first end, respectively. Claim 5 A mullion sleeve for connecting mullions at a specific angle, characterized in that, in claim 2 or 3, a dovetail groove is formed in the first coupling portion such that the space of the inner portion is relatively wider than the inlet side, and a dovetail projection is formed in the second coupling portion to be inserted into the dovetail groove.

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