Curtain rail joint

Abstract

To connect curtain rails having various shapes.SOLUTION: A joint 1 includes a pair of side parts 2, 3 facing mutually, an upper part 4 for connecting the pair of side parts 2, 3, a lower part 5 which is a part connecting the pair of side parts 2, 3, oppositely to the upper part 4, for forming a space for allowing passage of a runner, and an engaging part 6 provided on each of the side parts 2, 3. The engaging part 6 is a part projecting to the opposite side to the facing side of the side parts 2, 3, contactably with the curtain rail to which the joint 1 is attached.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a joint for a curtain rail. [Background technology]

[0002] Conventionally, multiple curtain rails have been connected depending on the size of the window, and a joint, which is a separate member from the curtain rail, has been used to connect two curtain rails. The joint is fitted into the ends of the curtain rail to connect the ends of the two curtain rails (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-061107 A Summary of the Invention [Problem to be solved by the invention]

[0004] Curtain rails come in a variety of shapes, and it may not be possible to use one joint for curtain rails of different shapes. In particular, curtain rails with different upper structures often require joints of different shapes. For this reason, there has been a demand for a joint structure that can be used for a variety of curtain rails.

[0005] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a curtain rail joint capable of connecting curtain rails of various shapes. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the curtain rail joint of the present invention comprises a pair of opposing side portions, an upper portion which connects the pair of side portions, a lower portion which faces the upper portion and connects to the pair of side portions and forms a space for a runner to pass through, and an engaging portion provided on each of the side portions, wherein the engaging portion is a portion which protrudes on the opposite side to the opposing side of the side portions so as to be able to come into contact with the curtain rail.

[0007] In a curtain rail joint according to one aspect of the present invention, the engagement portion is formed on the opposing side of the side portion so as to be recoverably deformable.

[0008] In a curtain rail joint according to one aspect of the present invention, the engagement portion has a protruding portion that protrudes toward the opposite side to the opposing side of the side portion.

[0009] In a curtain rail joint according to one embodiment of the present invention, the engagement portion has a first engagement portion which is one of the engagement portions and a second engagement portion which is the other of the engagement portions, and the protrusion of the first engagement portion protrudes more sharply than the protrusion of the second engagement portion.

[0010] In a curtain rail joint according to one embodiment of the present invention, each of the side portions is provided with one first engagement portion and two second engagement portions, and the first engagement portion is positioned between the second engagement portions.

[0011] In one embodiment of the present invention, the side portion has an opening that forms a space corresponding to the engagement portion, and the engagement portion has at least one cut-and-raised portion in the opening that connects the protrusion and the side portion.

[0012] In one embodiment of the present invention, in a curtain rail joint, the cut-and-raised portion is formed so that the portion closer to the protrusion than the portion connected to the side portion is positioned on the opposite side of the side portion than the portion connected to the side portion.

[0013] In the curtain rail joint according to one aspect of the present invention, the engagement portion has two of the cut-and-raised portions, and the two cut-and-raised portions face each other via the protruding portion.

[0014] In one aspect of the present invention, a curtain rail joint has a resin cover that covers the upper and side portions inside the curtain rail joint. Effect of the Invention

[0015] The curtain rail joint according to the present invention can connect curtain rails of various shapes. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a perspective view of a joint of a curtain rail according to an embodiment of the present invention. [Diagram 2] FIG. 4 is another perspective view of the curtain rail joint according to the embodiment of the present invention. [Diagram 3] FIG. 2 is a top view of the joint of the curtain rail shown in FIG. [Figure 4] 2 is a bottom view of the joint of the curtain rail shown in FIG. 1. [Figure 5A] FIG. 2 is a side view of the joint of the curtain rail shown in FIG. [Figure 5B] 2 is an enlarged view of an engagement portion of a joint of the curtain rail shown in FIG. 1. [Figure 5C] 1. FIG. 4 is an enlarged view showing another engaging portion of the joint of the curtain rail shown in FIG. [Figure 5D] 2 is an enlarged view of an engagement portion of a joint of the curtain rail shown in FIG. 1. [Figure 5E] 1. FIG. 4 is an enlarged view showing another engaging portion of the joint of the curtain rail shown in FIG. [Figure 6] FIG. 2 is a plan view of a joint of the curtain rail shown in FIG. [Figure 7] FIG. 2 is a cross-sectional view of a joint of the curtain rail shown in FIG. [Figure 8] FIG. 2 is a perspective view of a curtain rail connected by the joint shown in FIG. 1. [Figure 9] 9 is a cross-sectional view taken at the position of the tip of the protrusion of the first engagement portion of the curtain rail and the joint shown in FIG. 8. [Figure 10] 9 is a cross-sectional view taken at the position of the tip of the protruding portion of the second engagement portion of the curtain rail and the joint shown in FIG. 8. FIG. [Figure 11] 2A to 2C are diagrams showing a process of attaching the joint of the curtain rail shown in FIG. 1 to the curtain rail. [Figure 12] 1 is a perspective view of a cover attached to a joint of a curtain rail according to an embodiment of the present invention; [Figure 13] 13 is another perspective view of the cover attached to the joint of the curtain rail according to the embodiment of the present invention. FIG. [Figure 14] 13 is a side view of a cover for the joint of the curtain rail shown in FIG. 12. [Figure 15] FIG. 13 is a plan view of a cover for the joint of the curtain rail shown in FIG. [Figure 16] 13 is a perspective view of the joint of the curtain rail shown in FIG. 1 with the cover shown in FIG. 12 attached. [Figure 17] 13 is a cross-sectional view of the joint of the curtain rail shown in FIG. 1 with the cover shown in FIG. 12 attached. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0018] FIG. 1 is a perspective view of a joint 1 (hereinafter simply referred to as a joint) of a curtain rail according to an embodiment of the present invention, and FIG. 2 is another perspective view of the joint 1. Also, FIG. 3 is a top view of the joint 1, FIG. 4 is a bottom view of the joint 1, FIG. 5A is a side view of the joint 1, FIG. 6 is a plan view of the joint 1, and FIG. 7 is a cross-sectional view of the joint 1. For convenience of explanation, the side in the direction of the arrow a (see FIG. 5A) is referred to as the upper side, and the side in the direction of the arrow b (see FIG. 5A) is referred to as the lower side. Note that the upper side and the lower side do not limit the position of the joint 1 in space, and the joint 1 can take any position in space.

[0019] 1 to 7, a joint 1 according to an embodiment of the present invention includes side portions 2, 3 which are a pair of portions opposed to each other, an upper portion 4 which connects the pair of side portions 2, 3, a lower portion 5 which faces the upper portion 4 and connects to the pair of side portions 2, 3 and forms a space for a runner to pass through, and an engagement portion 6 provided on each of the side portions 2, 3. The engagement portion 6 is a portion which protrudes on the side opposite the opposing side of the side portions 2, 3 so as to be able to come into contact with a curtain rail to which the joint 1 is attached. The configuration of the joint 1 will be specifically described below.

[0020] As shown in Figs. 1 to 7, the joint 1 is a member extending along a straight line, and has a space inside the lower portion 5 and the joint 1 for a runner that runs on the curtain rail to pass through. The side portion 2, the side portion 3, the upper portion 4, and the lower portion 5 each extend along a plane, and for example, each extend parallel or approximately parallel to the plane. Note that the plane along which the side portion 2, the side portion 3, the upper portion 4, and the lower portion 5 each extend is a virtual plane. The joint 1 is made integrally, and the side portions 2 and 3, the upper portion 4, and the lower portion 5 are parts of the integral joint 1 formed from the same material. The material of the joint 1 is, for example, stainless steel, which allows the thickness of each portion to be thin. The material of the joint 1 is not limited to stainless steel.

[0021] Each of the side portions 2, 3 is specifically a plate-like portion, and as described above, extends along a plane, for example, parallel or approximately parallel to the plane. Also, as described above, each of the side portions 2, 3 is provided with an engagement portion 6, and the engagement portion 6 is provided in an opening 10 formed in each of the side portions 2, 3, for example, as shown in Figs.

[0022] Specifically, as shown in Figs. 1 to 7, the side portion 2 has a first opening 11 and a second opening 12 as the opening 10, for example, one first opening 11 and two second openings 12. The first opening 11 is provided between two second openings 12, for example, the first opening 11 is provided in the center or approximately the center in the extension direction of the side portion 2, and the two second openings 12 are provided at positions at the same or approximately the same distance from the first opening 11 in the extension direction of the side portion 2. The first opening 11 and the second opening 12 are parts that form an opening penetrating the side portion 2. The openings formed by the first opening 11 and the second opening 12 are openings that extend in the extension direction of the side portion 2, and are, for example, rectangular or approximately rectangular openings.

[0023] The side portion 2 has edges 11a, 11b, 11c, and 11d surrounding the first opening 11. The edges 11a and 11b face each other in the extension direction of the side portion 2, and the edges 11c and 11d face each other in the up-down direction, and the edges 11a, 11b, 11c, and 11d define a space penetrating the side portion 2, and the first opening 11 is formed in the side portion 2.

[0024] Further, the side portion 2 has edges 12a, 12b, 12c, and 12d surrounding the second opening 12. The edges 12a and 12b face each other in the extension direction of the side portion 2, and the edges 12c and 12d face each other in the up-down direction. The edges 12a, 12b, 12c, and 12d define a space penetrating the side portion 2, and the second opening 12 is formed in the side portion 2.

[0025] In addition, the lower edges 13a, 14a of the ends 13, 14 in the extension direction of the side portion 2 extend at an angle upward from the lower edge 15 of the portion between the ends 13 and 14 of the side portion 2, and the ends 13, 14 of the side portion 2 have a tapered shape.

[0026] The side portion 3 has a similar configuration to the side portion 2, and like the side portion 2, has a first opening 11 and a second opening 12 as the opening 10, ends 13 and 14, and an edge 15. The side portion 3 is symmetrical to the side portion 2.

[0027] Specifically, the upper portion 4 is a plate-like portion, and as described above, extends along a plane, for example, parallel or approximately parallel to the plane. The upper portion 4 connects the side portion 2 and the side portion 3 at the upper edges of the side portion 2 and the side portion 3. As shown in Figs. 1, 3, 6, and 7, the upper portion 4 may have a step portion 4a that is a portion recessed inside the joint 1, and the upper portion 4 may be connected to the side portions 2 and 3 via the step portion 4a. In addition, the upper portion 4 is provided with a through hole 4b that penetrates the upper portion 4. The through hole 4b is provided corresponding to the engagement portion 6 provided in the first opening 11 of the side portions 2 and 3, and is provided in the center or approximately the center in the extension direction of the joint 1. Note that the upper portion 4 does not have to have the through hole 4b. In addition, the upper portion 4 may have a protrusion protruding upward or downward instead of the through hole 4b.

[0028] The lower portion 5 is specifically a plate-like portion, and as described above, extends along a plane, for example, parallel or approximately parallel to the plane. The lower portion 5 extends, for example, parallel or approximately parallel to the upper portion 4. As described above, the lower portion 5 forms a space for the runner to pass through, and has a running portion 21 that is a portion protruding from the edge 15 of the side portion 2, and a running portion 22 that is a portion protruding from the edge 15 of the side portion 3, as shown in Figs. 2, 4, 6, and 7. The running portion 21 and the running portion 22 face each other across a space in the direction in which the side portions 2 and 3 face each other, forming the space for the above-mentioned runner to pass through.

[0029] As shown in FIG. 4, the running portion 21 extends along the edge 15 of the side portion 2. The width of the running portion 21 protruding from the edge 15 of the side portion 2 increases from the ends 21a and 21b toward the center in the extension direction of the running portion 21. For example, as shown in FIG. 4, the running portion 21 has inclined portions 23 and 24 and a straight portion 25. The inclined portions 23 and 24 are portions extending from the ends 21a and 21b toward the center, respectively, and the width of the running portion 21 in the inclined portion 23 increases from the end 21a toward the center in the extension direction of the running portion 21, and similarly, the width of the running portion 21 in the inclined portion 24 increases from the end 21b toward the center in the extension direction of the running portion 21. The straight portion 25 extends between the inclined portion 23 and the inclined portion 24, and the width of the running portion 21 in the straight portion 25 is constant or approximately constant. The inclined portions 23 and 24 and the straight portion 25 are smoothly connected to each other.

[0030] 4, the inclined portions 23, 24 of the running portion 21 may have edges 23a, 24a on the running portion 22 side that extend in a straight or substantially straight line, or the edges 23a, 24a may extend in a curved line, a line that is a combination of straight lines and straight lines, or a line that is a combination of straight lines and curves. In addition, the running portion 21 does not need to have the straight line portion 25, and the inclined portions 23 and 24 may be connected.

[0031] Run portion 22 has a similar configuration to run portion 21, and like run portion 21, has inclined portions 23 and 24 extending from ends 22a and 22b, respectively, in the extension direction of run portion 22, and a straight portion 25 extending between inclined portions 23 and 24. Run portion 22 is symmetrical to run portion 21.

[0032] As described above, the engagement portion 6 is a portion that protrudes toward the opposite side of the side portions 2 and 3, and is capable of contacting the curtain rail when the joint 1 is in use, which will be described later. That is, the engagement portion 6 protrudes toward the outside of the side portions 2 and 3. The outside of the side portions 2 and 3 is the side opposite to the inside, which is the space side through which the runner passes, and in FIG. 6, the left side of the side portion 2 is the outside of the side portion 2, and in FIG. 6, the right side of the side portion 3 is the outside of the side portion 3. For example, the engagement portion 6 has elasticity, and is formed so as to be deformable and recoverable on the opposite side of the side portions 2 and 3. That is, the engagement portion 6 is formed so as to be deformable toward the outside of the side portions 2 and 3 or toward the inside of the side portions 2 and 3 by an external force, and is formed so as to return to the position before deformation or approximately to the position before deformation after the external force is removed.

[0033] As shown in Figs. 1 to 5A, 5B, 5C, 5D, and 5E, the joint 1 has, for example, a first engagement portion 30 and a second engagement portion 40 as the engagement portion 6. Figs. 5B and 5D show an enlarged view of the first engagement portion 30, and Figs. 5C and 5E show an enlarged view of the second engagement portion 40. The first engagement portion 30 is provided in the first opening 11 of the side portions 2 and 3, and the second engagement portion 40 is provided in the second opening 12 of the side portions 2 and 3. In this way, the joint 1 has one first engagement portion 30 and two second engagement portions 40 corresponding to the openings 10 on each of the side portions 2 and 3.

[0034] Specifically, as shown in Figs. 1 to 7, the first engagement portion 30 has a protruding portion 31 that protrudes outward from the side portions 2 and 3. The first engagement portion 30 also has at least one cut-and-raised portion that connects the protruding portion 31 to the side portions 2 and 3 at the first opening 11. In the illustrated example, the first engagement portion 30 has two cut-and-raised portions 32 and 33. The cut-and-raised portions 32 and 33 face each other via the protruding portion 31.

[0035] The protruding portion 31 is a plate-like portion, as shown in, for example, Figures 3, 4, 5A, 5B, and 5D, and is a portion formed by bending a plate-like material so as to protrude outward from the side portions 2 and 3. The cut-and-raised portions 32 and 33 are plate-like portions, as shown in, for example, Figures 3, 4, 5A, 5B, and 5D, and the cut-and-raised portion 32 extends between one edge (edge ​​31a) of the protruding portion 31 in the extension direction of the side portions 2 and 3 and the edge 11a of the first opening 11, and the cut-and-raised portion 33 extends between the other edge (edge ​​31b) of the protruding portion 31 in the extension direction of the side portions 2 and 3 and the edge 11b of the first opening 11. The cut-and-raised portions 32 and 33 have the same or approximately the same shape, and the cut-and-raised portions 32 and 33 are symmetrical or approximately symmetrical with respect to the protruding portion 31. The protruding portion 31 is symmetrical or approximately symmetrical with respect to its center. It is to be noted that cut-and-raised portion 32 and cut-and-raised portion 33 do not have to have the same shape. Furthermore, protrusion 31 does not have to be symmetrical about its center.

[0036] The protrusion 31 and the cut-and-raised portions 32, 33 are not connected to the edges 11c, 11d of the first opening 11. This allows the cut-and-raised portions 32, 33 to be swung or bent relative to the edges 11a, 11b of the side portions 2, 3 by an external force, and can be restored to a position before the swinging or deformation or to a position close to the position before the swinging or deformation after the external force is removed. Therefore, the protrusion 31 can be moved toward the outside of the side portions 2, 3 or toward the inside of the side portions 2, 3 by an external force, and can be restored to a position before the deformation or to a position approximately before the deformation after the external force is removed.

[0037] The cut-and-raised portion 32 is formed so that the portion on the protruding portion 31 side of the portion (root portion 32a) connected to the edge 11a of the side portions 2 and 3 is located further outward from the side portions 2 and 3 than the root portion 32a. For example, as shown in Figs. 3, 4, 5B, and 5D, the cut-and-raised portion 32 extends obliquely with respect to the side portions 2 and 3 so that the tip portion 32b is located further outward from the side portions 2 and 3 than the root portion 32a. The tip portion 32b is a portion of the cut-and-raised portion 32 connected to the protruding portion 31. The cut-and-raised portion 32 may be curved so that the tip portion 32b is located further outward from the side portions 2 and 3 than the root portion 32a. The cut-and-raised portion 32 may have another shape such that the tip portion 32b is located further outward from the side portions 2 and 3 than the root portion 32a.

[0038] Furthermore, as long as the tip 31c of the protrusion 31 is located outside the side portions 2 and 3, the tip 32b of the cut-and-raised portion 32 does not have to be located further outboard of the side portions 2 and 3 than the base portion 32a. For example, the cut-and-raised portion 32 may extend flush or approximately flush with the side portions 2 and 3, or the cut-and-raised portion 32 may extend such that the tip 32b is located further inboard of the side portions 2 and 3 than the base portion 32a.

[0039] As with the cut-and-raised portion 32, the cut-and-raised portion 33 is formed such that the portion on the protruding portion 31 side of the portion (root portion 33a) connected to the edge 11b of the side portions 2 and 3 is located further outward from the side portions 2 and 3 than the root portion 33a. For example, as shown in Figs. 3, 4, 5B, and 5D, the cut-and-raised portion 33 extends obliquely with respect to the side portions 2 and 3 such that the tip portion 33b is located further outward from the side portions 2 and 3 than the root portion 33a. The tip portion 33b is the portion of the cut-and-raised portion 33 that connects to the protruding portion 31. The cut-and-raised portion 33 may be curved such that the tip portion 33b is located further outward from the side portions 2 and 3 than the root portion 33a. The cut-and-raised portion 33 may have another shape such that the tip portion 33b is located further outward from the side portions 2 and 3 than the root portion 33a.

[0040] Furthermore, as long as the tip 31c of the protrusion 31 is located outside the side portions 2 and 3, the tip 33b of the cut-and-raised portion 33 does not have to be located further outboard of the side portions 2 and 3 than the base portion 33a. For example, the cut-and-raised portion 33 may extend flush or approximately flush with the side portions 2 and 3, or the cut-and-raised portion 33 may extend such that the tip 33b is located further inboard of the side portions 2 and 3 than the base portion 33a.

[0041] The second engagement portion 40 has the same configuration as the first engagement portion 30, and specifically, as shown in Figs. 1 to 7, has a protruding portion 41 that protrudes outward from the side portions 2 and 3. The second engagement portion 40 also has at least one cut-and-raised portion that connects the protruding portion 41 and the side portions 2 and 3 at the second opening 12. In the illustrated example, the second engagement portion 40 has two cut-and-raised portions 42 and 43. The cut-and-raised portions 42 and 43 face each other via the protruding portion 41.

[0042] The protruding portion 41 is a plate-like portion, as shown in, for example, Figures 3, 4, 5A, 5C, and 5E, and is a portion formed by bending a plate-like material so as to protrude outward from the side portions 2 and 3. The cut-and-raised portions 42 and 43 are plate-like portions, as shown in, for example, Figures 3, 4, 5A, 5C, and 5E, and the cut-and-raised portion 42 extends between one edge (edge ​​41a) of the protruding portion 41 in the extension direction of the side portions 2 and 3 and the edge 12a of the second opening 12, and the cut-and-raised portion 43 extends between the other edge (edge ​​41b) of the protruding portion 41 in the extension direction of the side portions 2 and 3 and the edge 12b of the second opening 12. The cut-and-raised portions 42 and 43 have the same or approximately the same shape, and the cut-and-raised portions 42 and 43 are symmetrical or approximately symmetrical with respect to the protruding portion 41. The protruding portion 41 is symmetrical or approximately symmetrical with respect to its center. It is to be noted that the cut-and-raised portion 42 and the cut-and-raised portion 43 do not have to have the same shape. In addition, the protruding portion 41 does not have to be symmetrical about its center.

[0043] The protrusion 41 and the cut-and-raised portions 42, 43 are not connected to the edges 12c, 12d of the second opening 12. This allows the cut-and-raised portions 42, 43 to be swung or bent relative to the edges 12a, 12b of the side portions 2, 3 by an external force, and can be restored to a position before the swinging or deformation or to a position close to the position before the swinging or deformation after the external force is removed. Therefore, the protrusion 41 can be moved toward the outside of the side portions 2, 3 or toward the inside of the side portions 2, 3 by an external force, and can be restored to a position before the deformation or to a position approximately before the deformation after the external force is removed.

[0044] The cut-and-raised portion 42 is formed so that the portion on the protruding portion 41 side of the portion (root portion 42a) connected to the edge 12a of the side portions 2 and 3 is located further outward from the side portions 2 and 3 than the root portion 42a. For example, as shown in Figs. 3, 4, 5C, and 5E, the cut-and-raised portion 42 extends obliquely with respect to the side portions 2 and 3 so that the tip portion 42b is located further outward from the side portions 2 and 3 than the root portion 42a. The tip portion 42b is a portion of the cut-and-raised portion 42 that connects to the protruding portion 41. The cut-and-raised portion 42 may be curved so that the tip portion 42b is located further outward from the side portions 2 and 3 than the root portion 42a. The cut-and-raised portion 42 may have another shape such that the tip portion 42b is located further outward from the side portions 2 and 3 than the root portion 42a.

[0045] Furthermore, as long as the tip 41c of the protruding portion 41 is located outside the side portions 2 and 3, the tip 42b of the cut-and-raised portion 42 does not have to be located further outboard than the base portion 42a of the side portions 2 and 3. For example, the cut-and-raised portion 42 may extend flush or approximately flush with the side portions 2 and 3, or the cut-and-raised portion 42 may extend such that the tip 42b is located further inboard than the base portion 42a of the side portions 2 and 3.

[0046] As with the cut-and-raised portion 42, the cut-and-raised portion 43 is formed such that the portion on the protruding portion 41 side of the portion (root portion 43a) connected to the edge 12b of the side portions 2 and 3 is located further outward from the side portions 2 and 3 than the root portion 43a. For example, as shown in Figs. 3, 4, 5C, and 5E, the cut-and-raised portion 43 extends obliquely with respect to the side portions 2 and 3 such that the tip portion 43b is located further outward from the side portions 2 and 3 than the root portion 43a. The tip portion 43b is a portion of the cut-and-raised portion 43 that connects to the protruding portion 41. The cut-and-raised portion 43 may be curved such that the tip portion 43b is located further outward from the side portions 2 and 3 than the root portion 43a. The cut-and-raised portion 43 may have another shape such that the tip portion 43b is located further outward from the side portions 2 and 3 than the root portion 43a.

[0047] Furthermore, as long as the tip 41c of the protruding portion 41 is located outside the side portions 2 and 3, the tip 43b of the cut-and-raised portion 43 does not have to be located further outboard of the side portions 2 and 3 than the base portion 43a. For example, the cut-and-raised portion 43 may extend flush or approximately flush with the side portions 2 and 3, or the cut-and-raised portion 43 may extend such that the tip 43b is located further inboard of the side portions 2 and 3 than the base portion 43a.

[0048] As shown in Figs. 3, 4, 5D, and 5E, the projection 31 of the first engaging portion 30 and the projection 41 of the second engaging portion 40 have different shapes. Specifically, the projection 31 of the first engaging portion 30 projects more acutely than the projection 41 of the second engaging portion 40. For example, the tip 31c of the projection 31 of the first engaging portion 30 is more acutely angled than the tip 41c of the projection 41 of the second engaging portion 40. Specifically, the projection 31 of the first engaging portion 30 is bent at a more acute angle than the projection 41 of the second engaging portion 40, and the tip 31c of the projection 31 forms a surface with a larger curvature than the tip 41c of the projection 41. In addition, the projection 31 of the first engaging portion 30 may project further outward from the side portions 2 and 3 than the projection 41 of the second engaging portion 40.

[0049] In joint 1, the first engagement portion 30 of side portion 2 and the first engagement portion 30 of side portion 3 face each other in the direction in which sides 2, 3 face each other (the width direction of joint 1), and the second engagement portion 40 of side portion 2 and the second engagement portion 40 of side portion 3 face each other in the width direction of joint 1.

[0050] The side portions 2 and 3, the cut-and-raised portions 32 and 33, and the protruding portion 31 are formed from the same material and are integrated together, and the side portions 2 and 3, the cut-and-raised portions 32 and 33, and the protruding portion 31 have the same or approximately the same thickness. The side portions 2 and 3, the cut-and-raised portions 42 and 43, and the protruding portion 41 have the same or approximately the same thickness. For example, the protruding portion 31 and the cut-and-raised portions 32 and 33, as well as the protruding portion 41 and the cut-and-raised portions 42 and 43, are formed by pressing the material of the side portions 2 and 3. The protruding portion 31 and the cut-and-raised portions 32 and 33, as well as the protruding portion 41 and the cut-and-raised portions 42 and 43 may be formed by pressing simultaneously when the side portions 2 and 3 are molded.

[0051] As described later, in the use state of the joint 1, the joint 1 is held in the running space (inside) of the curtain rail via the engagement portion 6, and is held by the curtain rail. Therefore, as described above, the engagement portion 6 is capable of contacting the curtain rail, and is capable of contacting the curtain rail in the running space of the curtain rail. Specifically, the distance in the width direction of the joint 1 between the tip 31c of the protruding portion 31 of the first engagement portion 30 of the side portion 2 and the tip 31c of the protruding portion 31 of the second engagement portion 30 of the side portion 3, which face each other, is larger than the distance in the width direction of the inner surface of the side of the curtain rail (the width of the inner surface of the side of the curtain rail), and the distance in the width direction of the joint 1 between the tip 41c of the protruding portion 41 of the second engagement portion 40 of the side portion 2 and the tip 41c of the protruding portion 41 of the second engagement portion 40 of the side portion 3, which face each other, is larger than the width of the inner surface of the side of the curtain rail. The inner side surface of the curtain rail is the surface that faces the running space of the side of the curtain rail, and the width direction of the inner side surface of the curtain rail is the direction in which the sides face each other.

[0052] Next, the operation of the curtain rail joint 1 having the above-mentioned configuration will be described.

[0053] Fig. 8 is a perspective view of the curtain rail 100 connected by the joint 1, Fig. 9 is a cross-sectional view at the position of the tip 31c of the protruding portion 31 of the first engagement portion 30 of the curtain rail 100 in Fig. 8, and Fig. 10 is a cross-sectional view at the position of the tip 41c of the protruding portion 41 of the second engagement portion 40 of the curtain rail 100 in Fig. 8. The cross sections shown in Figs. 9 and 10 are cross sections perpendicular to the extension direction of the joint 1.

[0054] As shown in FIG. 8, two curtain rails 100 are connected by a joint 1. The joint 1 is connected such that the end 1a side portion is fitted into the running space 101 from one end side portion (end 102) of one curtain rail 100, and the end 1b side portion is fitted into the running space 101 from the other end side portion (end 103) of the other curtain rail 100. When the two curtain rails 100 are connected, the end face 102a of the end 102 of one curtain rail 100 and the end face 103a of the end 103 of the other curtain rail 100 are in contact with each other or face each other with a small gap. The running space 101 is a space surrounded by the sides 104, 105, upper part 106, and lower part 107 of the curtain rail 100, and is a space through which the runner 110 passes. Furthermore, upper portion 106 of curtain rail 100 is fixed to a ceiling, a frame, or the like with screws or the like, and in the fixed curtain rail 100, the direction from upper portion 106 to lower portion 107 is the vertically downward direction.

[0055] In the use state of the joint 1, which is attached to the curtain rail 100 and connects the curtain rail 100, the joint 1 is held by the curtain rail 100 in the running space 101 of the curtain rail 1. Specifically, as shown in Figs. 9 and 10, the first engagement portion 30 and the second engagement portion 40 are in contact with the side portions 104 and 105 of the curtain rail 100, and the joint 1 is held by the curtain rail 100. As described above, the distance in the width direction of the joint 1 between the tip 31c of the protruding portion 31 of the first engagement portion 30 of the side portion 2 and the tip 31c of the protruding portion 31 of the first engagement portion 30 of the side portion 3 facing each other is larger than the width between the inner surface 104a of the side portion 104 and the inner surface 105a of the side portion 105 of the curtain rail 100, so that the protruding portion 31 of the first engagement portion 30 is pushed inward as the cut-and-raised portions 32, 32 swing or deform, as shown in Fig. 9. This inward pressure on the protruding portion 31 generates an outward reaction force in the first engagement portion 30, and this reaction force presses the protruding portion 31 against the inner surfaces 104a, 105a of the side portions 104, 105 of the curtain rail 100. This generates a holding force that holds the joint 1 to the curtain rail 100.

[0056] Similarly, the distance in the width direction of the joint 1 between the tip 41c of the protrusion 41 of the second engagement part 40 of the side part 2 and the tip 41c of the protrusion 41 of the second engagement part 40 of the side part 3 facing each other is larger than the width between the inner surface 104a of the side part 104 and the inner surface 105a of the side part 105 of the curtain rail 100, so that the cut-and-raised parts 42, 42 of the protrusion 41 of the second engagement part 40 swing or deform and are pressed inward, as shown in Fig. 10. This inward pressing of the protrusion 41 generates a reaction force toward the outside in the second engagement part 40, and this reaction force presses the protrusion 41 against the inner surfaces 104a, 105a of the side parts 104, 105 of the curtain rail 100. This generates a holding force that holds the joint 1 to the curtain rail 100.

[0057] In this way, the joint 1 is held to the curtain rail 100 on the outside of the side parts 2 and 3, and is not held to the curtain rail above the upper part of the joint as in conventional joints. This increases the degree of freedom in the shape of the upper part of the curtain rail, and the joint 1 can be applied to curtain rails having upper parts of various shapes.

[0058] The curtain rail 100 is fixed to a mounting target such as a ceiling or a frame by a fixing means such as a screw. When the joint is held on the curtain rail above the upper part as in the conventional joint, the fixing means of the curtain rail and the joint interfere with each other, so it was necessary to prevent the joint from interfering with the fixing means of the curtain rail. For example, it was necessary to form a through hole in the joint for co-fastening with the curtain rail, or to provide the joint with an interference relief structure. In contrast, the joint 1 can form a space between the upper part 106 of the curtain rail 100 and the upper part 4 of the joint 1, so it is possible to eliminate the need to consider interference between the fixing means of the curtain rail 100 and the joint 1.

[0059] FIG. 11 is a diagram showing the process of attaching the joint 1 to the curtain rail 100, and shows the state in which the joint 1 is attached to one of the curtain rails 100. As described above, the first opening 11 is provided at the center or approximately the center of the joint 1 in the extension direction of the joint 1, and the first engagement part 30 is provided at the center or approximately the center of the joint 1. In order to equalize the force supporting the curtain rail 100 to which the joint 1 is connected, the curtain rail 100 is connected at the center or approximately the center position in the extension direction of the joint 1. Therefore, in a used state, the first engagement part 30 of the joint 1 is located near the connection part of the curtain rail 100, that is, near the end faces 102a and 103a of the curtain rail 100 that face each other.

[0060] 11, the joint 1 is attached to one side of the curtain rail 100 so that the first engagement portion 30 of the joint 1 is located near the connection portion of the curtain rail 100. In other words, the joint 1 is fitted into the curtain rail 100 until the protrusion 31 of the first engagement portion 30 contacts the end surface 102a of the curtain rail 100.

[0061] As described above, the protruding portion 41 of the second engaging portion 40 has a shape in which the tip 41c has a gentle curved surface, so that the protruding portion 41 of the second engaging portion 40 does not provide a large resistance when the joint 1 is fitted into the curtain rail 100. On the other hand, the protruding portion 31 of the first engaging portion 30 rises so as to protrude at an acute angle with respect to the side portions 2 and 3, and the tip 31c has a shape with a sharper curved surface. Therefore, when the joint 1 is fitted into the curtain rail 100, the protruding portion 31 of the first engaging portion 30 provides a large resistance, and the joint 1 is prevented from entering too far into the curtain rail 100. This makes it easier to finish fitting the joint 1 into one of the curtain rails 100 with the protruding portion 31 in contact with the end surface 102a of the curtain rail 100, and it is possible to finish fitting the joint 1 into one of the curtain rails 100 with the protruding portion 31 located near the end surface 102a of the curtain rail 100.

[0062] Similarly, when the joint 1 fitted into one curtain rail 100 is fitted into the other curtain rail 100, the protrusion 31 of the first engagement portion 30 provides a larger resistance, preventing the joint 1 from entering too far into the curtain rail 100. When the protrusion 31 is in contact with the end face 102a of one curtain rail 100, when the joint 1 is fitted into the other curtain rail 100, the end face 102a of the one curtain rail 100 comes into contact with the end face 103a of the other curtain rail 100 when the protrusion 31 exceeds the end face 103a of the other curtain rail 100. Therefore, the protrusion 31 does not enter too far into the other curtain rail 100. Also, when the protrusion 31 exceeds the end face 102a of the one curtain rail 100 and enters the curtain rail 100, when the joint 1 is fitted into the other curtain rail 100, the other curtain rail 100 receives the sliding resistance of the second engagement portion 40 of the joint 1. Since the joint 1 is held on one curtain rail 100 by the first engagement portion 30 and the second engagement portion 40, the joint 1 is held on the one curtain rail 100 stronger than the force generated by the sliding resistance between the other curtain rail 100 and the second engagement portion 40. For this reason, the joint 1 can be fitted into the other curtain rail 100 without moving or moving significantly on the one curtain rail 100 until the end surface 103a of the other curtain rail 100 comes into contact with the end surface 102a of the one curtain rail 100.

[0063] In this way, the first engagement portion 30 of the joint 1 does not go too far into one curtain rail 100 or the other curtain rail 100. In other words, the joint 1 makes it easy to connect the curtain rails 100 at an appropriate position.

[0064] 9 and 10, in the used state, running parts 21 and 22 of joint 1 face inner surface 107a of lower part 107 of curtain rail 100, and for example, running parts 21 and 22 are in contact with inner surface 107a of lower part 107. In other words, at the connection part of curtain rail 100, runner 110 passes through running parts 21 and 22 of joint 1. Therefore, even if there is a step at the connection part of curtain rail 100, runner 110 can smoothly run through the connection part of curtain rail 100 without getting caught on the step at the connection part of curtain rail 100.

[0065] As described above (see FIG. 4), the running parts 21 and 22 of the joint 1 have inclined parts 23 and 24 at both ends in the running direction of the runner 110, in which the width of the running parts 21 and 22 increases from the ends 21a and 22a toward the center in the extension direction of the running parts 21 and 22. Therefore, as shown in FIG. 9, the width of the running parts 21 and 22 at the ends of the joint 1 becomes wider toward the connection part of the curtain rail 100. Therefore, the runner 110 can easily get on and off the running parts 21 and 22 of the joint 1, and the runner 110 can smoothly run between the running parts 21 and 22 of the joint 1 and the lower part 107 of the curtain rail 100. From this point of view, the material of the joint 1 is preferably a material that can make the joint 1 thin.

[0066] On the other hand, as shown in Fig. 10, in the connection part of the curtain rail 100, the straight part 25 of the running parts 21, 22 is located on the inner surface 107a of the lower part 107 of the curtain rail 100. The width of the running parts 21, 22 in the straight part 25 is constant or approximately constant, and the edge 25a of the straight part 25 is located at the same position or approximately the same position as the edge 107b of the lower part 107 of the curtain rail 100 in the width direction. This allows the runner 110 to run more smoothly through the connection part of the curtain rail 100. Note that the edge 25a of the straight part 25 does not have to be located at the same position as the edge 107b of the lower part 107 of the curtain rail 100 in the width direction.

[0067] In addition, the ends 13, 14 of the side portion 2 are tapered, which makes it easier for the joint 1 to be fitted inside the curtain rail 100.

[0068] As described above, the curtain rail joint 1 according to the embodiment of the present invention can connect curtain rails of various shapes.

[0069] As described above, in order to improve the running performance of the runner 110, stainless steel is used as the material of the joint 1, which allows the joint 1 to be thin while still providing sufficient strength. Stainless steel has a glossy finish, and the gloss of the stainless steel may be noticeable when the joint 1 is attached to the curtain rail 100 in use. For this reason, a cover 50 may be attached to the joint 1 to remove the gloss of the stainless steel joint 1.

[0070] Fig. 12 is a perspective view of cover 50 attached to joint 1 of a curtain rail, and Fig. 13 is another perspective view of cover 50 attached to joint 1. Fig. 14 is a side view of cover 50, and Fig. 15 is a plan view of cover 50. The configuration of cover 50 will be specifically described below.

[0071] The cover 50 is an inner member that is housed in the space through which the runner 110 of the joint 1 runs, and has a shape that corresponds to this space. The material of the cover 50 is resin, and the cover 50 is molded from a colored resin material. The material of the cover 50 may be another material.

[0072] 12 to 15, the cover 50 extends in correspondence with the joint 1, is a member extending along a straight line, and has side portions 51 and 52 corresponding to the side portions 2 and 3 of the joint 1, respectively, and an upper portion 53 corresponding to the upper portion 4 of the joint 1. The side portion 51 of the cover 50 is a portion facing the side portion 2 of the joint 1 when the cover 50 is in a used state, which will be described later, and the side portion 52 of the cover 50 is a portion facing the side portion 3 of the joint 1 when the cover 50 is in a used state, which will be described later. The upper portion 53 of the cover 50 is a portion facing the upper portion 4 of the joint 1 when the cover 50 is in a used state, which will be described later. The cover 50 is made as a single piece, and the side portions 51 and 52 and the upper portion 53 are portions of the single cover 50 formed from the same material.

[0073] Specifically, each of the side portions 51 and 52 is a plate-like portion and extends along a plane, for example, parallel or approximately parallel to the plane. The plane along which each of the side portions 51 and 52 extends is a virtual plane. The side portions 51 and 52 overlap the side portions 2 and 3 of the joint 1 from the inside, and are shaped to cover the side portions 2 and 3 of the joint 1 from the inside. The lower edges 54a and 55a of the ends 54 and 55 in the extension direction of the side portion 51 extend obliquely upward from the lower edge 56 of the portion between the ends 54 and 55 of the side portion 51, and the ends 54 and 55 of the side portion 51 have a tapered shape. The edges 54a, 56, and 55a of the side portion 51 have the same or approximately the same shape as the edges 13a, 15, and 14a of the side portion 2 of the joint 1.

[0074] Side portion 52 is similar to side portion 51, and lower edges 54a, 55a of ends 54, 55 in the extension direction of side portion 52 extend obliquely upward from a lower edge 56 of the portion between ends 54 and 55 of side portion 52, and ends 54, 55 of side portion 51 have a tapered shape. Edges 54a, 56, 55a of side portion 52 have the same or substantially the same shape as edges 13a, 15, 14a of side portion 3 of joint 1.

[0075] 15, the side portion 51 of the cover 50 has edges 54a, 56, and 55a, which are the lower ends, positioned outwardly from the connection portion of the side portion 51 with the upper portion 53, and for example, the side portion 51 of the cover 50 is inclined outwardly from the upper portion 53. Similarly, the side portion 52 of the cover 50 has edges 54a, 56, and 55a, which are the lower ends, positioned outwardly from the connection portion of the side portion 52 with the upper portion 53, and for example, the side portion 52 of the cover 50 is inclined outwardly from the upper portion 53. In this way, the distance between the side portion 51 and the side portion 52 in the opposing direction of the sides 51 and 52 (the width direction of the cover 50) becomes wider toward the edges 54a, 56, and 55a. Furthermore, the distance between side portion 51 and side portion 52 in the width direction of cover 50 at edges 54a, 56, 55a is the same as the distance between inner surface 2a of side portion 2 and inner surface 3a of side portion 3 in the width direction of joint 1, or is larger than the distance between inner surface 2a of side portion 2 and inner surface 3a of side portion 3 in the width direction of joint 1. Note that sides 51 and 52 of cover 50 do not have to be inclined outward with respect to top portion 53, and the distance between side portion 51 and side portion 52 in the width direction of cover 50 may be the same or approximately the same.

[0076] Specifically, the upper portion 53 is a plate-like portion and extends along a plane, for example, parallel or approximately parallel to the plane. The plane along which the upper portion 53 extends is a virtual plane. The upper portion 53 overlaps the upper portion 4 of the joint 1 from the inside, and is shaped to cover the upper portion 4 of the joint 1 from the inside. The upper portion 53 connects the side portion 51 and the side portion 52 at the upper edges of the side portion 51 and the side portion 52. The upper portion 53 may have a step portion 53a that is a portion recessed into the inside of the cover 50, as shown in Figs. 12, 13, and 15, and the upper portion 53 may be connected to the side portions 51 and 52 via the step portion 53a. In addition, the upper portion 53 has a protrusion 53b that protrudes upward, as shown in Figs. 12, 14, and 15. The protrusion 53b of the upper part 53 corresponds to the through hole 4b formed in the upper part 4 of the joint 1, and when the cover 50 is attached to the joint 1 so that the side parts 51, 52 and the upper part 53 of the cover 50 overlap the side parts 2, 3 and the upper part 4 of the joint 1, respectively, the protrusion 53b of the cover 50 is accommodated in the through hole 4b of the joint 1. In other words, the protrusion 53b of the cover 50 and the through hole 4b of the joint 1 function as guides that allow the cover 50 to be attached to the joint 1 in an appropriate position.

[0077] In the cover 50, the thicknesses of the side portions 51, 52 and the upper portion 53 may be the same or approximately the same, and the thicknesses of the side portions 51, 52 may be the same or approximately the same. In the illustrated example, the thicknesses of the side portions 51, 52 are the same or approximately the same, and the thickness of the portion of the upper portion 53 excluding the step portion 53a is thicker than the thicknesses of the side portions 51, 52. The structure regarding the thickness of the upper portion 53 is not limited to this. A rib 53c may be formed on the upper side of the upper portion 53 to increase strength.

[0078] Next, the operation of the cover 50 having the above-mentioned configuration will be described. Figure 16 is a perspective view of the joint 1 to which the cover 50 is attached, and Figure 17 is a cross-sectional view of the joint 1 to which the cover 50 is attached.

[0079] The cover 50 is attached to the joint 1 by being inserted into the inside of the joint 1 from the end 13 or end 14 side of the joint 1. In a use state in which the cover 50 is attached to the joint 1, a side portion 51 of the cover 50 covers an inner surface 2a of a side portion 2 of the joint 1, and a side portion 52 of the cover 50 covers an inner surface 3a of a side portion 3 of the joint 1. In addition, in a use state of the cover 50, an upper portion 53 of the cover 50 covers an inner surface 4a of an upper portion 4 of the joint 1. In a use state, the cover 50 does not cover the inner surfaces 21c, 22c of the running portions 21, 22 of the joint 1. However, edges 56 which are the lower ends of the respective side portions 51, 52 of the cover 50 are in contact with the inner surfaces 21c, 22c of the running portions 21, 22 of the joint 1. The edges 56 of the sides 51 , 52 of the cover 50 do not have to be in contact with the inner surfaces 21 c , 22 c of the running parts 21 , 22 of the joint 1 .

[0080] As described above, the distance between side portion 51 and side portion 52 in the width direction of cover 50 at edges 54a, 56, and 55a is the same as the distance between inner surface 2a of side portion 2 and inner surface 3a of side portion 3 in the width direction of joint 1, or is larger than the distance between inner surface 2a of side portion 2 and inner surface 3a of side portion 3 in the width direction of joint 1. For this reason, as shown in Fig. 17, the holding force of cover 50 against joint 1 acts in the width direction of cover 50 at the lower ends of sides 51 and 52 of cover 50. The holding force of cover 50 against joint 1 may also act in the up-down direction.

[0081] 17, a gap is formed between the upper portion 53 of the cover 50 and the upper portion 4 of the joint 1. This gap makes it possible to easily insert the cover 50 into the inside of the joint 1. Note that no gap may be formed between the upper portion 53 of the cover 50 and the upper portion 4 of the joint 1.

[0082] As described above, in use, the cover 50 covers the inner surface 4c of the upper portion 4 and the inner surfaces 2a, 3a of the side portions 2, 3 of the joint 1. Therefore, even if the joint 1 is made of shiny stainless steel, the joint 1 can be made to have no shine or to be less likely to have a shine, making the joint 1 less noticeable on the curtain rail 100. In particular, if the cover 50 is made the same color or approximately the same color as the curtain rail 100, the joint 1 can be made even less noticeable on the curtain rail 100.

[0083] As described above, in the used state, the cover 50 does not cover the runs 21, 22 of the joint 1, but in the curtain rail 100, the lower surfaces of the runs 21, 22 of the joint 1 are covered by the lower portion 107 of the curtain rail 100. For this reason, even in the used state, the inner surfaces 21c, 22c of the runs 21, 22 of the joint 1 may be glossy, but the inner surfaces 21c, 22c of the runs 21, 22 of the joint 1 cannot be seen from below, and the gloss of the inner surfaces 21c, 22c of the runs 21, 22 is not noticeable.

[0084] In this way, by attaching the cover 50, the gloss of the joint 1 can be made less noticeable, and the joint 1 can be made less noticeable on the curtain rail 100. This can improve the design of the joint 1, and ultimately the design of the curtain rail 100.

[0085] Although the embodiment of the present invention has been described above, the present invention is not limited to the joint 1 according to the embodiment of the present invention, but includes all aspects included in the concept of the present invention and the scope of the claims. In addition, each configuration may be appropriately and selectively combined so as to achieve at least a part of the above-mentioned problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiment may be appropriately changed depending on the specific use of the present invention.

[0086] For example, the positions and numbers of the engagement portion 6 and the openings 10 are not limited to those described above. The shape of the joint 1 may be changed according to the shape of the curtain rail to which the joint 1 is attached. The shape of the cover 50 may be changed according to the shape of the joint 1. The joint 1 may have one or more second engagement portions, and may have two or more first engagement portions 30. The engagement portion 6 does not have to have the two cut-and-raised portions 32, 33, and may have one of the cut-and-raised portions 32, 33, and the protrusions 31, 41 may be directly connected to the side portions 2, 3 at one edge. [Explanation of symbols]

[0087] 1...Joint, 1a,1b...End, 2,3...Side, 2a,3a...Inner surface, 4...Top, 4a...Step, 4b...Through hole, 4c...Inner surface, 5...Lower, 6...Engaging part, 10...Opening, 11...First opening, 11a, 11b, 11c, 11d...Edge, 12...Second opening, 12a, 12b, 12c, 12d ...edge, 13,14...end, 13a,14a,15...edge, 21,22...running part, 21a,21b,22a,22b...end, 21c,22c...inner surface , 23, 24... Sloped part, 23a, 24a, 25a... Edge, 25... Straight part, 30... First engaging part, 40... Second engaging part, 31, 41... Protruding part, 31a, 31b, 41a, 41b...edge, 31c, 41c...tip, 32, 33, 42, 43...raised portion, 32a, 33a, 42a, 43a...base portion, 32b, 33b, 42b, 43b...tip portion, 50...cover, 51, 52...side portion, 53...upper portion, 53a...step portion, 53b...projection portion, 53c...rib, 54, 55...end portion, 54a, 55a, 56...edge, 100...curtain rail, 101...running space, 102, 103...end portion, 102a, 103a...end surface, 104, 105...side portion, 104a, 105a...inner surface, 106...upper portion, 107...lower portion, 107a...inner surface, 107b...edge, runner 110

Claims

1. A pair of side portions opposed to each other; An upper portion that is a portion connecting the pair of side portions; a lower portion that faces the upper portion and is connected to the pair of side portions and forms a space for a runner to pass through; and an engagement portion provided on each of the side portions, The engaging portion is a portion that protrudes toward the opposite side of the side portion so as to be capable of contacting a curtain rail, The engagement portion has a protruding portion that protrudes on a side opposite to the opposing side of the side portion, The engaging portion includes a first engaging portion which is one of the engaging portions and a second engaging portion which is another of the engaging portions, A joint for a curtain rail, wherein the first engagement portion has a greater resistance to the curtain rail than the second engagement portion.

2. 2. The curtain rail joint according to claim 1, wherein the engaging portion is formed on the opposing side of the side portion so as to be recoverably deformable.

3. 2. The curtain rail joint according to claim 1, wherein the protruding portion of the first engagement portion protrudes sharper than the protruding portion of the second engagement portion.

4. The curtain rail joint according to claim 2, characterized in that each of the side portions is provided with one first engagement portion and two second engagement portions, and the first engagement portion is positioned between the second engagement portions.

5. the side portion has an opening that forms a space corresponding to the engagement portion, 5. The curtain rail joint according to claim 1, wherein the engagement portion has at least one cut-and-raised portion that connects the protrusion and the side portion at the opening.

6. The curtain rail joint as described in claim 5, characterized in that the cut-and-raised portion is formed so that the portion closer to the protrusion than the portion connected to the side portion is located on the opposite side to the opposing side of the side portion than the portion connected to the side portion.

7. The engagement portion has two cut-and-raised portions, 7. The curtain rail joint according to claim 5, wherein the two cut-and-raised portions face each other via the protruding portion.

8. 8. The curtain rail joint according to claim 1, further comprising a resin cover for covering the upper and side portions inside the curtain rail joint.

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