Drain cap

Abstract

To provide a drain cap facilitating an insertion of a plate spring member into an exhaust port while improving nonslip effect of the plate spring member to the inside surrounding of the exhaust port significantly than before.SOLUTION: A drain cap 10 comprises a cap body 5 covering an exhaust port 3 in water communication structure, a plate spring member 8 extending toward a side opposite to the exhaust port 3 from the cap body 5 and made narrower and inserted to the inside of the exhaust port 3, then expanded by resilient force of itself and compressed and held at the inside surrounding of the exhaust port 3 and a nonslip tool 11 constituting an elastic rubber attached at a longitudinal direction suitable position of the plate spring member 8, and the plate spring member 8 is arranged in the state where an auxiliary plate spring 8a shorter than a longitudinal dimension of itself is overlapped at the side opposite to the exhaust port 3, and respective longitudinal direction intermediate parts of the plate spring member 8 and the auxiliary plate spring 8a are fastened together and fixed at a suitable place of the cap body 5 side, and the nonslip tool 11 is attached at a range non overlapping with the auxiliary plate spring 8a of the plate spring member 8.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a drain cap that is attached to a drain outlet for draining rainwater. [Background technology]

[0002] It is common for roofs and balconies on each floor of buildings, such as condominiums, to have drains to drain rainwater. Drain caps are attached to these types of drains to prevent solid objects such as fallen leaves, twigs, paper, or vinyl that may accompany the rainwater from entering the drains, to avoid the danger of the drains being exposed, and to maintain the appearance of the building.

[0003] As shown in Figure 13, in the case of a conventional drain cap 1, a drain body 4 which forms a drain outlet 3 for discharging rainwater that accumulates on the surface of a concrete structure 2 constituting the roof or balcony of a building is buried in the concrete structure 2, and a drain pipe (not shown) is connected directly below the drain body 4.

[0004] The drain outlet 3 is covered by a cap body 5 having a water-permeable structure, which is dome-shaped as shown in the figure and has a number of openings 6 for letting rainwater through, and a stem 7 extending downward from the cap body 5 is provided on the underside of the top center of the cap body 5, and two leaf spring members 8 are fixed to the lower end of the stem 7 with screws 9. The length of the leaf spring members 8 is sufficiently longer than the diameter of the drain outlet 3, and the two leaf spring members 8 are attached overlapping each other so as to cross in a cross shape.

[0005] In addition, when installing the cap body 5 on the drain outlet 3, the worker bends the two leaf spring members 8 downward and inserts them into the inside of the drain outlet 3 in a state narrower than the diameter of the drain outlet 3.When the leaf spring members 8 are released from the worker's hands during insertion, the leaf spring members 8 expand due to their own elasticity and are pressed against the inner periphery of the drain outlet 3 (the inner surface of the tubular part of the drain body 4), thereby fixing the cap body 5.

[0006] However, the leaf spring member 8 made of spring steel has point or line contact with the inside periphery of the drain outlet 3, making it slippery, and there was a risk that the drain cap 1 would be pulled off from the drain outlet 3 by strong winds from a typhoon, etc. Therefore, it was proposed to surround the tip of the leaf spring member 8 with a plastic anti-slip body to enhance the anti-slip effect (see Patent Document 1 below). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Utility Model Registration No. 3164857 Summary of the Invention [Problem to be solved by the invention]

[0008] However, since the anti-slip body surrounding the tip of the leaf spring member 8 also has a flat plate shape, the situation in which the anti-slip body makes point or line contact with the curved surface around the inside of the drain outlet 3 remains unchanged, and there is a problem that the intended high anti-slip effect cannot be obtained.

[0009] Therefore, the inventors have devised a novel anti-slip device for the leaf spring member 8, which can be elastically deformed to conform to the curved surface around the inside of the drain outlet 3 and pressed over a wide area to obtain a high anti-slip effect, and have already filed this application as Patent Application No. 2020-26853.However, a new problem has been discovered in that attaching such an anti-slip device to the leaf spring member 8 makes it difficult to insert it into the drain outlet 3.

[0010] In other words, if an anti-slip device is attached to the leaf spring member 8, the anti-slip device will press against the inside of the drain outlet 3 when inserted into the drain outlet 3, causing it to get caught, making it difficult to push the leaf spring member 8 into the drain outlet 3.However, if the elastic force of the leaf spring member 8 is weakened to avoid this, then the anti-slip effect may be weakened after the drain cap 1 is installed.

[0011] The present invention has been made in consideration of the above-mentioned situation, and aims to provide a drain cap that greatly improves the anti-slip effect of the leaf spring member against the inner periphery of the drain outlet compared to conventional methods, while making it easy to insert the leaf spring member into the drain outlet. [Means for solving the problem]

[0012] The present invention is a drain cap comprising a cap body with a water-permeable structure that covers a drain outlet, a leaf spring member that extends from the cap body toward the side facing the drain outlet and is inserted into the inside of the drain outlet in a narrowed position and then expands by its own elastic force to be held in pressure against the inside periphery of the drain outlet, and an anti-slip device made of elastic rubber that is attached to an appropriate position in the longitudinal direction of the leaf spring member, wherein the leaf spring member is equipped with an auxiliary leaf spring that is shorter than its own longitudinal dimension, superimposed on the side facing the drain outlet, and the longitudinal intermediate portions of the leaf spring member and the auxiliary leaf spring are fixed together at appropriate positions on the cap body side, while the anti-slip device is attached to an area of ​​the leaf spring member that does not overlap with the auxiliary leaf spring.

[0013] In this way, the leaf spring member and the auxiliary leaf spring work together to exert the elastic force necessary to prevent the drain cap from falling off from the drain outlet, while the rigidity of the leaf spring member in the area where it does not overlap with the auxiliary leaf spring can be relatively reduced.

[0014] As a result, even if the anti-slip device gets caught on the inside periphery of the drain when the leaf spring member is compressed and inserted inside the drain, the rigidity of the area where the anti-slip device is attached is relatively low, so the tip side of the leaf spring member bends inward and escapes, thereby immediately releasing the anti-slip device from the catch and making it easier to push in the leaf spring member.

[0015] On the other hand, after the leaf spring member is inserted, the auxiliary leaf spring that is installed in a superimposed state in the longitudinal middle part of the leaf spring member continuously assists the elastic force, thereby ensuring the necessary elastic force, and the anti-slip device that is strongly pressed against the inner periphery of the drain outlet exerts a high anti-slip effect, effectively preventing the drain cap from falling off from the drain outlet.

[0016] Furthermore, in specifically implementing the drain cap of the present invention, the anti-slip device comprises a pressure contact portion that forms an abutment surface against the inner periphery of the drain outlet, a retaining portion that is responsible for attaching the leaf spring member to an appropriate position in the longitudinal direction, and a connecting portion that connects the retaining portion and the pressure contact portion, and it is preferable that a displacement space that assists elastic deformation of the pressure contact portion is interposed at least between both widthwise sides of the pressure contact portion and the retaining portion.

[0017] When configured in this manner, when the leaf spring member is pressed against the inner periphery of the drain outlet via the anti-slip device, both widthwise sides of the pressure contact portion of the anti-slip device elastically deform to conform to the circumferential curved surface of the drain outlet, resulting in a high anti-slip effect as most of the pressure contact portion is pressed against the inner periphery of the drain outlet over a wide area.

[0018] Furthermore, even if the diameter of the drain outlet changes, the pressure-contact portion of the anti-slip device will elastically deform to follow the change and conform to the circumferential curved surface of the drain outlet, so that it is possible to always press most of the pressure-contact portion against the internal circumference of drain outlets of various diameters, thereby providing a high anti-slip effect regardless of the diameter of the drain outlet.

[0019] In addition, in the present invention, it is preferable that only the center portion of the pressure-contact portion is connected to the holding portion via the connecting portion and that a displacement space is interposed so as to surround the connecting portion, so that the pressure-contact portion is configured to be freely swivelled and tilted in all directions.

[0020] In this way, even if the degree of opening of the leaf spring member varies depending on the diameter of the drain outlet, and the inclination angle of the leaf spring member at the pressing position relative to the axial direction of the drain outlet varies, the pressing portion of the anti-slip device can swivel and tilt in all directions and elastically deform to follow the axial direction of the drain outlet, making it possible to more reliably press most of the pressing portion.

[0021] Furthermore, in the present invention, it is preferable that the retaining portion has a diamond-shaped cross-section hole through which the leaf spring member passes, and that the hole is formed so as to hold the width end of the leaf spring member in a diagonal direction with narrow pressure.In this way, by applying a force perpendicular to the face of the leaf spring member to crush the retaining portion, the diamond-shaped cross-section hole is flattened and extends in the width direction of the leaf spring member, making it easier to slide the retaining portion in the longitudinal direction of the leaf spring member and facilitating position adjustment.When the crushing of the retaining portion is stopped, the diamond-shaped cross-section hole returns to its original state, and the width end of the leaf spring member is again held in narrow pressure and fixed.

[0022] Furthermore, in the present invention, the leaf spring member may have a narrowed constricted portion at an appropriate position within the range where it does not overlap with the auxiliary leaf spring, while the retaining portion may be formed to have a groove into which the constricted portion fits to form a lip groove-shaped cross section. In this way, the retaining portion can be firmly fixed to the constricted portion of the leaf spring member so as not to easily shift position.

[0023] Furthermore, in the present invention, a protrusion that enhances the anti-slip effect may be formed on the contact surface of the pressure-connected portion that contacts the inner periphery of the drain outlet, and in this way, the formation of the protrusion makes it possible to further enhance the anti-slip effect. Effect of the Invention

[0024] The drain cap of the present invention can provide the following various excellent effects.

[0025] (I) According to the invention described in claim 1 of the present invention, even if the anti-slip device gets caught on the inside periphery of the drain when the leaf spring member is compressed and inserted into the inside of the drain, the tip side of the leaf spring member bends inward and escapes, immediately releasing the anti-slip device from the caught position and making it easier to push in the leaf spring member. After the leaf spring member is inserted, the auxiliary leaf spring that is superimposed on the longitudinal middle part of the leaf spring member continuously assists the elastic force, thereby ensuring the necessary elastic force. Therefore, the anti-slip effect of the leaf spring member against the inside periphery of the drain is significantly improved compared to conventional methods, while making it easier to insert the leaf spring member into the drain.

[0026] (II) According to the invention described in claim 2, when the leaf spring member is pressed against the inner periphery of the drain outlet via the anti-slip device, both widthwise sides of the pressing portion of the anti-slip device are elastically deformed to conform to the circumferential curved surface of the drain outlet, and the majority of the pressing portion can be pressed against the inner periphery of the drain outlet over a wide area regardless of the diameter of the drain outlet, thereby providing a highly practical anti-slip effect against the inner periphery of the drain outlet.

[0027] (III) According to the invention described in claim 3, even if there is variation in the inclination angle of the leaf spring member at the pressing position relative to the axial direction of the drain outlet, the pressing portion of the anti-slip device can be swiveled and tilted in all directions to elastically deform so as to follow the axial direction of the drain outlet, so that most of the pressing portion can be more reliably pressed against the inner periphery of the drain outlet.

[0028] (IV) According to the invention as set forth in claim 4, by applying force perpendicular to the surface of the leaf spring member to crush the holding portion, it is possible to facilitate sliding of the leaf spring member in the longitudinal direction, thereby facilitating position adjustment. Moreover, by simply stopping the crushing of the holding portion, the width end of the leaf spring member can be again held in a narrow pressure and easily re-fixed.

[0029] (V) According to the invention as set forth in claim 5, a narrowed constricted portion is formed at an appropriate position on the leaf spring member so as not to overlap with the auxiliary leaf spring, and the retaining portion has a groove into which the constricted portion is fitted to form a lip groove-shaped cross section. This makes it possible to firmly fix the retaining portion to the constricted portion of the leaf spring member so as not to easily shift position.

[0030] (VI) According to the invention described in claim 6, by forming a protrusion on the contact surface of the pressure contact portion that contacts the inner periphery of the drain outlet, the anti-slip effect of the leaf spring member against the inner periphery of the drain outlet can be further enhanced. [Brief description of the drawings]

[0031] [Figure 1] FIG. 2 is a perspective view showing the first embodiment of the present invention removed from a drain outlet. [Diagram 2] 2 is a perspective view showing a leaf spring member of the drain cap of FIG. 1 in a compressed state. FIG. [Diagram 3] 3 is a cross-sectional view showing the drain cap of FIG. 2 attached to a drain outlet. FIG. [Figure 4] 2 is a perspective view showing details of an anti-slip device attached to the leaf spring member of FIG. 1. FIG. [Diagram 5] FIG. 11 is a perspective view showing a second embodiment of the present invention. [Figure 6] FIG. 11 is a perspective view showing a third embodiment of the present invention. [Figure 7] FIG. 13 is a perspective view showing a fourth embodiment of the present invention. [Figure 8] FIG. 13 is a perspective view showing a fifth embodiment of the present invention. [Figure 9] FIG. 13 is a perspective view showing a sixth embodiment of the present invention. [Figure 10] FIG. 13 is a perspective view showing a seventh embodiment of the present invention. [Figure 11] FIG. 13 is a perspective view showing an eighth embodiment of the present invention. [Figure 12] FIG. 12 is a perspective view showing a drain cap in FIG. 11 in an unattached state. [Figure 13]FIG. 11 is a cross-sectional view showing a conventional example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0033] 1 to 4 show a first embodiment of the drain cap of the present invention, and parts having the same reference numerals as those in FIG. 13 represent the same objects.

[0034] As shown in Figs. 1 to 3, the first embodiment is also applicable to sites where a drain body 4 is buried in a concrete structure 2 constituting the roof or balcony of a building, forming a drain outlet 3 for draining rainwater that accumulates on the surface, and a drain pipe (not shown) is connected directly below the drain body 4. The cap body 5 is dome-shaped and has a water-permeable structure that covers the drain outlet 3 and has a plurality of openings 6 for passing rainwater. The cap body 5 is fixed to the lower end of a stem part 7 extending downward from the central lower surface of the top of the cap body 5 with a screw 9, protrudes downward from the cap body 5, and is inserted into the drain outlet 3 by being tightened. The drain cap 10 is equipped with a leaf spring member 8 that is then expanded by its own elastic force and pressed against the inner periphery of the drain outlet 3 (the inner surface of the cylindrical portion of the drain body 4). The leaf spring member 8 is equipped with an auxiliary leaf spring 8a that is shorter in length than the leaf spring member 8, which is superimposed on its underside (the side facing the drain outlet 3). The longitudinal middle portions of the leaf spring member 8 and the auxiliary leaf spring 8a are fixed together to the lower end of the shaft portion 7 via screws 9, and an anti-slip device 11 made of elastic rubber is attached to the area of ​​the leaf spring member 8 that does not overlap with the auxiliary leaf spring 8a.

[0035] As shown enlarged in Figure 4, this anti-slip device 11 is composed of a pressure contact portion 12 that forms an abutment surface against the inner periphery of the drain outlet 3, a holding portion 13 that is responsible for attaching the leaf spring member 8 to an appropriate position in the longitudinal direction, and a connecting portion 14 that connects the holding portion 13 and the pressure contact portion 12, and a displacement space 15 that assists elastic deformation of the pressure contact portion 12 is interposed between both widthwise sides of the pressure contact portion 12 and the holding portion 13.

[0036] In the example shown here, the pressure contact portion 12 of the anti-slip device 11 is formed in a flat plate shape, and the holding portion 13 is formed to have a lip groove-shaped cross section that clamps both sides of the width of the leaf spring member 8 and holds it so that it can slide freely, and the widthwise intermediate portions of the pressure contact portion 12 and the holding portion 13 are connected by a connecting portion 14 over the entire length of the anti-slip device 11, so that the anti-slip device 11 can be attached at any position within the range where it does not overlap with the auxiliary leaf spring 8a of the leaf spring member 8.

[0037] In this way, the elastic force required to prevent the drain cap 10 from falling off from the drain outlet 3 is exerted by the cooperation of the leaf spring member 8 and the auxiliary leaf spring 8a, and it is possible to relatively reduce the rigidity of the leaf spring member 8 in the area that does not overlap with the auxiliary leaf spring 8a.Therefore, even if the anti-slip device 11 gets caught on the internal periphery of the drain outlet 3 when the leaf spring member 8 is narrowed and inserted into the inside of the drain outlet 3, the rigidity in the area where the anti-slip device 11 is attached is relatively low, so that the tip side of the leaf spring member 8 bends inward and escapes, whereby the anti-slip device 11 is immediately released from the catch, making it easier to push in the leaf spring member 8.

[0038] In addition, after the leaf spring member 8 is inserted, the auxiliary leaf spring 8a, which is installed in a superimposed state in the longitudinal middle part of the leaf spring member 8, continuously assists the elastic force, thereby ensuring the necessary elastic force, and therefore the anti-slip device 11, which is strongly pressed against the inner periphery of the drain outlet 3, exerts a high anti-slip effect, effectively preventing the drain cap 10 from coming off the drain outlet 3.

[0039] In other words, when each leaf spring member 8 is pressed against the inner periphery of the drain outlet 3 via the anti-slip device 11, both widthwise sides of the pressure contact portion 12 of the anti-slip device 11 elastically deform to conform to the circumferential curved surface of the drain outlet 3, resulting in a high anti-slip effect as most of the pressure contact portion 12 is pressed against the inner periphery of the drain outlet 3 over a wide area.

[0040] Furthermore, even if the diameter of the drain outlet 3 changes, the pressure contact portion 12 of the anti-slip device 11 will elastically deform to follow the change and conform to the circumferential curved surface of the drain outlet 3, so that it is possible to always press most of the pressure contact portion 12 against the internal circumference of drain outlets 3 of various diameters, and a high anti-slip effect will be achieved regardless of the diameter of the drain outlet 3.

[0041] Therefore, according to the above first embodiment, even if the anti-slip device 11 gets caught on the internal periphery of the drain 3 when the leaf spring member 8 is compressed and inserted into the inside of the drain 3, the tip side of the leaf spring member 8 bends inward and escapes, immediately releasing the anti-slip device 11 from the caught state and making it easier to push in the leaf spring member 8, and after the leaf spring member 8 is inserted, the auxiliary leaf spring 8a, which is equipped in a state overlapping the longitudinal middle part of the leaf spring member 8, continuously assists the elastic force, thereby ensuring the necessary elastic force, so that the anti-slip effect of the leaf spring member 8 against the internal periphery of the drain 3 is significantly improved compared to the conventional method, while making it easier to insert the leaf spring member 8 into the drain 3.

[0042] In addition, when each leaf spring member 8 is pressed against the inner periphery of the drain outlet 3 via the anti-slip device 11, both widthwise sides of the pressure contact portion 12 of the anti-slip device 11 are elastically deformed to conform to the circumferential curved surface of the drain outlet 3, and the majority of the pressure contact portion 12 can be pressed against the inner periphery of the drain outlet 3 over a wide area regardless of the diameter of the drain outlet 3, thereby providing a highly practical anti-slip effect against the inner periphery of the drain outlet 3.

[0043] Here, in the case of the anti-slip device 11 previously described in detail in Figure 4, an example has been shown in which the anti-slip device 11 can be attached at any position within the range where it does not overlap with the auxiliary leaf spring 8a of the leaf spring member 8. However, if it is desired to firmly fix the anti-slip device 11 in an optimal position to match the diameter of the drainage outlet 3 at the site, as in the second embodiment shown in Figure 5, a narrowed constricted portion 16 can be formed at an appropriate position within the range where it does not overlap with the auxiliary leaf spring of the leaf spring member 8, while the retaining portion 13 of the anti-slip device 11 can be formed to have a groove 17 into which the constricted portion 16 is fitted, forming a lip groove-shaped cross section.

[0044] FIG. 6 shows a third embodiment of the present invention, in which only the center of the pressure contact portion 12 in the anti-slip device 11 is connected to the holding portion 13 via the connecting portion 14, and a displacement space 15 is interposed so as to surround the connecting portion 14, so that the pressure contact portion 12 is configured to be able to swivel and tilt freely in all directions.

[0045] In this way, even if the degree of opening of each leaf spring member 8 varies depending on the diameter of the drain outlet 3, and the inclination angle of each leaf spring member 8 at the pressing position relative to the axial direction of the drain outlet 3 varies, the pressing portion 12 of the anti-slip device 11 can swivel and tilt in all directions and elastically deform to follow the axial direction of the drain outlet 3, so that most of the pressing portion 12 can be more reliably pressed against the inner periphery of the drain outlet 3.

[0046] FIG. 7 shows a fourth embodiment of the present invention. In this fourth embodiment, it is preferable that the retaining portion 13 has a diamond-shaped cross-section hole 18 through which the leaf spring member 8 passes, and that the hole 18 is formed so as to hold the width end of the leaf spring member 8 in a diagonal direction with narrow pressure. In this way, by applying a force to the retaining portion 13 in a direction perpendicular to the surface of the leaf spring member 8 (see arrow A in FIG. 7) and compressing it, the diamond-shaped cross-section hole 18 is flattened and extends in the width direction of the leaf spring member 8, making it easier to slide the retaining portion 13 in the longitudinal direction of the leaf spring member 8. This makes it easy to adjust the position of the anti-slip device 11. Moreover, by simply stopping the compression of the retaining portion 13, the width end of the leaf spring member 8 can be held in narrow pressure again, and the leaf spring member 8 can be easily re-fixed.

[0047] Furthermore, in the first to fourth embodiments described above, the contact surface of the pressure contact portion 12 of the anti-slip device 11 is shown as a smooth surface, but the contact surface of the pressure contact portion 12 that contacts the inner periphery of the drain outlet 3 may be formed with protrusions that enhance the anti-slip effect, like the contact surface of a sneaker. For example, as shown in Figure 8 as a fifth embodiment, protrusions 19 with a mountain-shaped cross-section extending in the width direction are formed in multiple rows in the longitudinal direction, and it is particularly effective to form the mountain-shaped cross-section by tilting it in the direction in which the leaf spring member 8 is removed (the direction in which it comes out of the drain outlet 3).

[0048] Furthermore, as shown in FIG. 9 as a sixth embodiment, it is also possible to form multiple rows of rectangular cross-section protrusions 20 extending in the width direction in the longitudinal direction, or as shown in FIG. 10 as a seventh embodiment, it is also possible to form multiple cylindrical protrusions 21 scattered in a staggered pattern, in either case being able to further enhance the anti-slip effect.

[0049] Here, in the fifth to seventh embodiments, the widthwise middle portions of the pressure contact portion 12 and the holding portion 13 are connected by a connecting portion 14 over the entire length of the anti-slip device 11. Therefore, in order to prevent the elastic deformation of the pressure contact portion 12 from being hindered by the formation of the protrusions 19, 20, 21, the protrusions 19, 20 are formed separately on the left and right, and a V-shaped groove 22 is formed in the widthwise middle of the pressure contact portion 12.

[0050] However, it is also possible to support the pressure-connecting portion 12 having these protrusions 19, 20, 21 in such a way that it can swivel and tilt in all directions only at the center by the connecting portion 14 as shown in Figures 6 and 7, and it goes without saying that the shape of the protrusions is not limited to the three types of shapes shown in Figures 8 to 10.

[0051] Furthermore, Figures 11 and 12 show an eighth embodiment of the present invention. As described above, the first to seventh embodiments describe a vertical-drain type drain cap 10 that is intended to be attached to a drain outlet 3 that opens vertically on a horizontal plane, but the eighth embodiment in Figures 11 and 12 targets a horizontal-drain type drain cap 10 that is intended to be attached to a drain outlet 3 that opens horizontally in a corner formed by a horizontal plane and a vertical plane (the drainage flow path itself is formed with a downward slope toward the back).

[0052] In the case of such a horizontal drain type drain cap 10, the cap body 5 must have a water-permeable structure that can cover the drain outlet 3 that opens sideways at the corner formed by the horizontal plane and the vertical plane, so the cap body 5 has a different shape from that of the vertical drain type as shown in the figure. More specifically, it has a shape consisting of a rectangular slope that spans diagonally between the horizontal plane and the vertical plane of the corner in front of the drain outlet 3, and triangular side surfaces that cover both sides of the slope, and has a shape that allows rainwater to pass through. The cap has a water-passing structure having a plurality of openings 6, and the base end of an arm portion 23 is connected to the center of the side of the slope facing the drain outlet 3 so as to be freely tiltable, and the longitudinal middle portion of a leaf spring member 8 is fixed to the tip of the arm portion 23 with a screw 9 via a tiltable tilting piece 24, so that the arm portion 23 tilts relative to the slope of the cap body 5 and the tilting piece 24 tilts relative to the tip of the arm portion 23, thereby enabling the cap to accommodate differences in the diameter and gradient of the drain outlet 3.

[0053] And even in the eighth embodiment in which the drain cap 10 is of such a horizontal drain type, the leaf spring member 8 is equipped with an auxiliary leaf spring 8a which is shorter in longitudinal dimension than the leaf spring member 8 itself, superimposed on the side facing the drain outlet 3, and the longitudinal intermediate portions of the leaf spring member 8 and the auxiliary leaf spring 8a are fixed together to the tilting piece 24 via a screw 9, and an anti-slip device 11 made of elastic rubber is attached to the area of ​​the leaf spring member 8 which does not overlap with the auxiliary leaf spring 8a.

[0054] As with those described above, this anti-slip device 11 is composed of a pressure contact portion 12 that forms an abutment surface against the inner periphery of the drain outlet 3, a holding portion 13 that is responsible for attaching the leaf spring member 8 at an appropriate position in the longitudinal direction, and a connecting portion 14 that connects the holding portion 13 and the pressure contact portion 12, and a displacement space 15 that assists the elastic deformation of the pressure contact portion 12 is interposed between both sides of the pressure contact portion 12 in the width direction and the holding portion 13.In the example shown here, the holding portion 13 has a diamond-shaped cross-section hole 18 (see hole 18 in Figures 7 to 10) through which the leaf spring member 8 passes, and the hole 18 is formed to hold the width end of the leaf spring member 8 in a narrow pressure diagonally.

[0055] Thus, even in the case of such a horizontal drain type drain cap 10, the elastic force required to prevent the drain cap 10 from falling off from the drain outlet 3 is exerted by the cooperation of the leaf spring member 8 and the auxiliary leaf spring 8a, making it possible to relatively reduce the rigidity of the leaf spring member 8 in the area that does not overlap with the auxiliary leaf spring 8a.Therefore, even if the anti-slip device 11 gets caught on the internal periphery of the drain outlet 3 when the leaf spring member 8 is narrowed and inserted into the inside of the drain outlet 3, the rigidity in the area where the anti-slip device 11 is attached is relatively low, so that the tip side of the leaf spring member 8 bends inward and escapes, whereby the anti-slip device 11 is immediately released from the catch, making it easier to push in the leaf spring member 8.

[0056] In addition, after the leaf spring member 8 is inserted, the auxiliary leaf spring 8a, which is installed in a superimposed state in the longitudinal middle part of the leaf spring member 8, continuously assists the elastic force, thereby ensuring the necessary elastic force, and therefore the anti-slip device 11, which is strongly pressed against the inner periphery of the drain outlet 3, exerts a high anti-slip effect, effectively preventing the drain cap 10 from coming off the drain outlet 3.

[0057] At this time, both widthwise sides of the pressure contact portion 12 of the anti-slip device 11 elastically deform to conform to the circumferential curved surface of the drain outlet 3, and most of the pressure contact portion 12 is pressed against the internal periphery of the drain outlet 3 over a wide area, thereby obtaining a high anti-slip effect, as in the case of the vertical drain type drain cap 10 described above.

[0058] Furthermore, the drain cap of the present invention is not limited to the above-mentioned embodiment, and it is possible to apply structures other than those shown in the drawings to the anti-slip device, and it is of course possible to make various modifications within the scope of the present invention without departing from the gist of the present invention. [Explanation of symbols]

[0059] 3 Drain port 5 Cap body 7 Mandrel 8 Leaf spring member 8a Leaf spring member 10 Drain cap 11 Anti-slip equipment 12 Pressure Welding Part 13 Holding part 14 Connection part 15 Displacement Space 16 Neck 17 Groove 18 holes 19 Protrusion 20 Protrusion 21 Protrusion

Claims

1. A drain cap comprising a cap body with a water-permeable structure that covers a drain outlet, a leaf spring member that extends from the cap body toward the side facing the drain outlet and is inserted into the inside of the drain outlet in a narrowed position and then expands by its own elastic force to be held in pressure against the inside periphery of the drain outlet, and an anti-slip device made of elastic rubber attached to an appropriate position in the longitudinal direction of the leaf spring member, wherein the leaf spring member is equipped with an auxiliary leaf spring that is shorter than its own longitudinal dimension, superimposed on the side facing the drain outlet, and the longitudinal intermediate portions of the leaf spring member and the auxiliary leaf spring are fixed together at appropriate positions on the cap body side, while the anti-slip device is attached to an area of ​​the leaf spring member that does not overlap with the auxiliary leaf spring.

2. The drain cap described in claim 1, wherein the anti-slip device comprises a pressure contact portion that forms an abutment surface against the inner periphery of the drain outlet, a retaining portion that is responsible for attaching the leaf spring member to an appropriate position in the longitudinal direction, and a connecting portion that connects the retaining portion and the pressure contact portion, and wherein a displacement space that assists elastic deformation of the pressure contact portion is interposed at least between both widthwise sides of the pressure contact portion and the retaining portion.

3. 3. The drain cap according to claim 2, wherein only the center portion of the pressure contact portion is connected to the retaining portion via a connecting portion, a displacement space is interposed so as to surround the connecting portion, and the pressure contact portion is configured to be freely swivelled and tilted in all directions.

4. 4. The drain cap according to claim 2 or 3, wherein the retaining portion has a diamond-shaped hole through which the leaf spring member passes, and the hole is formed so as to narrowly hold the width end of the leaf spring member in a diagonal direction.

5. 4. A drain cap as described in claim 2 or 3, characterized in that the leaf spring member has a narrowed narrowed portion at an appropriate position within a range where it does not overlap with the auxiliary leaf spring, while the retaining portion has a groove into which the narrowed portion fits to form a lip groove-shaped cross section.

6. 6. The drain cap according to claim 2, 3, 4 or 5, wherein a protrusion is formed on a surface of the pressure contact portion that contacts the inner periphery of the drain port to enhance the anti-slip effect.

Images