Base for freestanding handrail and freestanding handrail

Abstract

To provide a base for a freestanding handrail and a freestanding handrail that can be properly installed on curved staircases. [Solution] A base 10 for a self-supporting handrail to be installed on a curved staircase 100, wherein a support column 20 for supporting a handrail rod 30 is erected on the base 10, and the base 10 has a tapered portion 11a that narrows toward the inside of the corner portion 110 when installed on the corner tread 210 of the corner portion 110 of the staircase 100.

Description

Technical Field

[0001] The present invention relates to a pedestal for a self-supporting handrail and a self-supporting handrail.

Background Art

[0002] Motion assisting devices for assisting the motions of users such as the elderly or care recipients have been proposed. For example, as a motion assisting device, a self-supporting handrail is known that can be installed on stairs without handrails to allow a user to walk on the stairs with peace of mind (see, for example, Patent Document 1). This type of self-supporting handrail includes, for example, a plurality of pedestals installed on different treads of stairs, support columns erected on each pedestal, and a handrail rod spanned between two support columns.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, with conventional self-supporting handrails, it is difficult to properly install them on curved stairs such as winding stairs or switchback stairs.

[0005] The present invention has been made to solve such problems, and an object thereof is to provide a pedestal for a self-supporting handrail and a self-supporting handrail that can be properly installed on curved stairs.

Means for Solving the Problems

[0006] To achieve the above objective, one embodiment of the base for a self-supporting handrail according to the present invention is a base for a self-supporting handrail installed on a curved staircase, wherein a support column for supporting a handrail rod is erected on the base, and the base has a tapered portion that narrows toward the inside of the corner when installed on the corner tread of the corner of the curved staircase.

[0007] Furthermore, one embodiment of the self-supporting handrail according to the present invention is a self-supporting handrail installed on a curved staircase, comprising a first base, a first support column erected on the first base, and a handrail rod supported by the first support column, wherein the first base has a tapered portion that narrows toward the inside of the corner when installed on the corner tread of the corner of the curved staircase. [Effects of the Invention]

[0008] According to the present invention, it is possible to realize a base for a self-supporting handrail and a self-supporting handrail that can be properly installed on a curved staircase. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view of a freestanding handrail according to Embodiment 1 installed on a staircase. [Figure 2] Figure 2 is a perspective view of a freestanding handrail according to Embodiment 1 installed on a staircase. [Figure 3] Figure 3 is a top view of the self-supporting handrail according to Embodiment 1 installed on a staircase. [Figure 4] Figure 4 is a top view of the first base of the self-supporting handrail according to Embodiment 1. [Figure 5] Figure 5 is an exploded perspective view of the first base of the self-supporting handrail according to Embodiment 1. [Figure 6] Figure 6 is an enlarged perspective view showing the area around the upper end of the first support column in the self-supporting handrail according to Embodiment 1. [Figure 7] Figure 7 is an enlarged perspective view showing the area around the upper end of the first support column in the self-supporting handrail according to Embodiment 1. [Figure 8] Figure 8 is an enlarged perspective view showing the area around the upper end of the first support column in the self-supporting handrail according to Embodiment 1. [Figure 9] Figure 9 is a top view of a self-supporting handrail according to Embodiment 2 installed on a staircase. [Figure 10] Figure 10 is a top view of a modified example of the second embodiment of a freestanding handrail installed on a staircase. [Figure 11] Figure 11 is a front view showing the area around the upper end of the first support column in a self-supporting handrail according to Modification 1. [Figure 12] Figure 12 is a front view showing the area around the upper end of the first support column in a self-supporting handrail according to modified example 2. [Figure 13] Figure 13 is a front view showing the area around the upper end of the first support column in a self-supporting handrail according to Modification 3. [Modes for carrying out the invention]

[0010] The embodiments of the present invention will be described below with reference to the drawings. The embodiments described below are all specific examples of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement positions of components, and connection configurations shown in the following embodiments are examples and are not intended to limit the present invention. Accordingly, among the components in the following embodiments, those components that are not described in the independent claim representing the highest-level concept of the present invention will be described as optional components.

[0011] Please note that each figure is a schematic diagram and not necessarily a strictly accurate representation. Therefore, the scale and other aspects may not necessarily be consistent across all figures. In addition, the same reference numerals are used for substantially identical components in each figure, and redundant explanations are omitted or simplified. Furthermore, in this specification, the terms "up" and "down" do not necessarily refer to the upward direction (vertically upward) and the downward direction (vertically downward) in absolute spatial perception.

[0012] (Embodiment 1) The self-supporting handrail 1 according to Embodiment 1 will be described with reference to Figures 1 to 8. Figures 1 to 3 are diagrams showing the self-supporting handrail 1 according to Embodiment 1 installed on a staircase 100. Figures 1 and 2 are perspective views thereof, and Figure 3 is a top view thereof. Figure 4 is a top view of the first base 11 in the self-supporting handrail 1, and Figure 5 is an exploded perspective view of the first base 11. Figures 6 to 8 are enlarged perspective views showing the vicinity of the upper end portion of the first support column 21 in the self-supporting handrail 1.

[0013] The self-supporting handrail 1 according to the present embodiment is an example of a movement assisting device that assists a user's movements. The user's movements include, for example, walking, standing up from a sitting state, or sitting down from a standing state. In addition, the users are mainly elderly people, persons requiring long-term care, persons requiring support, or persons with disabilities and the like.

[0014] As shown in Figures 1 to 3, the self-supporting handrail 1 is a handrail unit installed on the staircase 100. The self-supporting handrail 1 is a handrail apparatus that can be placed alone without being fixed to a building such as a staircase, a wall or a floor, or the ground and the like.

[0015] The self-supporting handrail 1 can be additionally installed after the staircase 100 is installed as needed. Therefore, when the self-supporting handrail 1 is no longer needed, the self-supporting handrail 1 can be removed. By installing the self-supporting handrail 1 on the staircase 100, the user can walk on the staircase with peace of mind. That is, the user can go up and down the staircase 100 using the self-supporting handrail 1. Although no permanent handrail is present on the staircase 100, a permanent handrail may be present on the staircase 100.

[0016] In the present embodiment, the staircase 100 is a curved staircase having a bent portion. Specifically, the staircase 100 is a winding staircase. The staircase 100 shown in Figure 1 is a 90-degree bent winding staircase. The staircase 100 may be an outdoor staircase installed outdoors, or may be an indoor staircase installed indoors. When the staircase 100 is an outdoor staircase, the staircase 100 is, for example, an approach staircase or the like installed between the entrance of a building and a road.

[0017] Furthermore, the stairs 100 may be a winding staircase that turns at an angle other than 90 degrees. Also, the stairs 100 are not limited to winding stairs. For example, the winding stairs 100 may be a U-shaped staircase that turns 180 degrees (two 90-degree turns).

[0018] The curved staircase 100 has a corner section 110 that constitutes a corner staircase, and a first straight section 120 and a second straight section 130 that constitute a straight staircase. The corner section 110 is located between the first straight section 120 and the second straight section 130. In other words, the corner section 110 is sandwiched between the first straight section 120 and the second straight section 130. The first straight section 120 is located below the corner section 110, and the second straight section 130 is located above the corner section 110.

[0019] The stairs 100 have multiple treads 200 that form steps. In other words, the multiple treads 200 are surfaces of different heights. The treads 200 are horizontal surfaces on which a user places their feet when walking up the stairs 100. Each of the multiple treads 200 extends in a direction perpendicular to the direction of travel of the user walking up the stairs 100. The base 10 of the self-supporting handrail 1 is installed on the tread 200. In other words, the treads 200 are the mounting surfaces on which the base 10 is installed.

[0020] A corner tread 210 is provided as a tread 200 at the corner section 110. The corner tread 210 has a tapered surface 211 that narrows towards the inside of the corner section 110. In other words, the area of ​​the tapered surface 211 decreases as it moves towards the inside of the corner section 110 (i.e., towards the center of the spiral staircase). Specifically, the width of the tapered surface 211 (the length of the tread 200 in the shorter direction) gradually decreases as it moves towards the inside of the corner section 110. The plan view shape of the tapered surface 211 is, for example, a triangle, but is not limited to this. The plan view shape of the tapered surface 211 may be a trapezoid or the like.

[0021] Multiple corner treads 210 are provided in the corner section 110. In this embodiment, three consecutive corner treads 210 are provided in the corner section 110 at different heights. Each of the three corner treads 210 has a tapered surface 211. In this embodiment, the angle (corner angle) between the two sides that make up the tapered surface 211 of the three corner treads 210 is 30 degrees in all cases. Note that the number of corner treads 210 provided in the corner section 110 is not limited to three. There may be one, two, or four corner treads 210. In this case, the corner angles of the multiple corner treads 210 may be the same or different.

[0022] The first straight section 120 is provided with multiple straight treads 220 as the treads 200. The second straight section 130 is provided with multiple straight treads 230 as the treads 200. Both the straight treads 220 and 230 are rectangular in shape. The width of the straight treads 220 and 230 in the longitudinal direction is approximately the same as the width of the stairs 100, for example, 50 cm to 150 cm. The depth (tread width) of the straight treads 220 and 230 in the transverse direction is approximately 20 cm to 60 cm, for example.

[0023] In this embodiment, the first straight section 120 is provided with two straight treads 220. The second straight section 130 is also provided with two straight treads 230. Note that the number of straight treads 220 and 230 is not limited to two. The number of straight treads 220 and 230 may be one or three or more. Also, the number of straight treads 220 and 230 may be the same or different.

[0024] A freestanding handrail 1 is installed on the staircase 100 configured in this way. The freestanding handrail 1 comprises a plurality of bases 10, a plurality of support columns 20, handrail bars 30, 41 and 42, and a support section 50. In this embodiment, one support column 20 is fixed to each base 10.

[0025] The base 10 is a base for a freestanding handrail. The base 10 is installed on the tread 200 of the stairs 100. When a user walks using the freestanding handrail 1, the user will pass over the base 10 installed on the tread 200. At this time, the user may or may not step on the base 10 with their feet. The base 10 is also the base to which the support column 20 is attached. In other words, the base 10 supports the support column 20.

[0026] In this embodiment, each of the multiple bases 10 is elongated and extends in the longitudinal direction of the tread 200. For example, the maximum length of the base 10 in the longitudinal direction is 60 cm to 100 cm (80 cm in this embodiment), and the maximum length of the base 10 in the short direction is 20 cm to 60 cm (30 cm in this embodiment). The base 10 is a base plate with a wide base. The central part of the base 10 in the longitudinal direction becomes a passageway when the user walks. Therefore, the area of ​​the top view shape of the base 10 should be at least half the area of ​​the tread 200 on which the base 10 is installed. In this case, the length of the base 10 in the longitudinal direction should be at least half the length of the tread 200 in the longitudinal direction. Also, the length of the base 10 in the short direction should be at least half the length of the tread 200 in the short direction.

[0027] Multiple bases 10 are installed on different treads 200 of the stairs 100. In this embodiment, the freestanding handrail 1 has three bases 10, and the three bases 10 are installed on different treads 200. Specifically, the freestanding handrail 1 has three bases 10: a first base 11, a second base 12, and a third base 13.

[0028] The first base 11 is installed on the corner tread 210 of the corner section 110. Specifically, the first base 11 is installed on the middle corner tread 210 of the three consecutive corner treads 210.

[0029] Furthermore, the second base 12 is installed on the straight tread 220 of the first straight section 120, and the third base 13 is installed on the straight tread 230 of the second straight section 130. The second base 12 is installed on the straight tread 220, which is separated from the corner tread 210 on which the first base 11 is installed by two treads 200. The third base 13 is installed on the straight tread 230, which is separated from the corner tread 210 on which the first base 11 is installed by two treads 200.

[0030] As shown in Figure 4, the first base 11 installed on the corner tread 210 has tapered portions 11a and 11b that taper towards the longitudinal end of the first base 11. The tapered portion 11b is located on the opposite side of the first base 11 from the tapered portion 11a in the longitudinal direction of the first base 11. In other words, the tapered portion 11a (first tapered portion) is provided on one side of the first base 11 in the longitudinal direction, and the tapered portion 11b (second tapered portion) is provided on the other side of the first base 11 in the longitudinal direction.

[0031] As shown in Figures 1 to 3, the tapered portion 11a (first tapered portion) of the first base 11 tapers toward the inside of the corner portion 110 on which the first base 11 is installed (i.e., toward the center of the spiral staircase). In this embodiment, the tapered portion 11a tapers toward the tip of the tapered surface 211 of the corner tread 210. In other words, when viewed from above, the area of ​​the tapered portion 11a decreases toward the inside of the corner portion 110. Specifically, the width of the tapered portion 11a (the length of the first base 11 in the shorter direction) gradually decreases toward the inside of the corner portion 110.

[0032] On the other hand, the tapered portion 11b (second tapered portion) of the first base 11 tapers outward toward the corner portion 110 on which the first base 11 is installed. In this embodiment, the tapered portion 11b tapers toward the portion of the corner tread 210 opposite to the tapered surface 211. In other words, when viewed from above, the area of ​​the tapered portion 11b decreases toward the outside of the corner portion 110. Specifically, the width of the tapered portion 11b (length in the short direction of the first base 11) gradually decreases toward the outside of the corner portion 110. Note that the plan view shape of the tapered portion 11a and the plan view shape of the tapered portion 11b are the same shape and the same size, but are not limited to this.

[0033] As shown in Figure 4, in this embodiment, the top view shape of the first base 11 is an elongated octagon (long octagon). Specifically, the elongated octagon constituting the first base 11 consists of an elongated rectangle and a pair of trapezoids that sandwich the rectangle from the longitudinal direction. In the first base 11, the tapered portion 11a is one of the pair of trapezoids in the elongated octagon constituting the first base 11, and the tapered portion 11b is the other of the pair of trapezoids in the elongated octagon constituting the first base 11. In this embodiment, the trapezoids constituting the tapered portions 11a and 11b are symmetrical, but are not limited to this. That is, the two inclination angles θ1 of the tapered portion 11a may be different from each other. Also, the two inclination angles θ2 of the tapered portion 11b may be different from each other. In this case, one of the two inclination angles θ1 may be 0 degrees (i.e., one of the two base angles of the trapezoid may be 90 degrees). Similarly, one of the two inclination angles θ2 may be 0 degrees.

[0034] When the corner angle of the corner tread 210 on which the first base 11 is installed is 30 degrees, the inclination angle θ1 of the tapered portion 11a in the octagonal first base 11 is preferably between 10 degrees and 30 degrees, as shown in Figure 4. In this embodiment, the inclination angle θ1 of the tapered portion 11a is the same as half the corner angle of the corner tread 210, which is 15 degrees. The inclination angle θ1 of the tapered portion 11a is the angle between the longitudinal direction of the first base 11 and the inclined side of the tapered portion 11a.

[0035] The inclination angle θ2 of the tapered portion 11b is also between 10 degrees and 30 degrees. The inclination angle θ2 of the tapered portion 11b is the angle between the longitudinal direction of the first base 11 and the inclined side of the tapered portion 11b. In this embodiment, the inclination angle θ2 of the tapered portion 11b is the same as the inclination angle θ1 of the tapered portion 11a. That is, θ2 = θ1 = 15°. However, the inclination angle θ2 of the tapered portion 11b may be different from the inclination angle θ1 of the tapered portion 11a.

[0036] As shown in Figure 5, the first base 11 has a main plate 10a, an edge cover 10b, and a surface sheet 10c.

[0037] The main plate 10a constitutes the body of the first base 11. The main plate 10a has the required weight so that the first base 11 can be stably installed on the tread surface 200 as the base of the self-supporting handrail 1. For example, the main plate 10a may be a metal plate made of a metal material. As an example, the main plate 10a is made of a metal material mainly composed of iron. For example, the main plate 10a is a steel plate made of iron or stainless steel. However, the main component of the metal material that makes up the main plate 10a is not limited to iron. For example, the main component of the metal material that makes up the main plate 10a may be titanium, copper, or lead. Also, the main plate 10a is a flat plate of a constant thickness. The thickness of the main plate 10a is, for example, 3 mm to 20 mm, but is not limited to this.

[0038] The main plate 10a is provided with through holes 10a1. The through holes 10a1 are screw holes into which screws are threaded, or bolt holes into which bolts are inserted. The first support column 21 can be fixed to the first base 11 through these through holes 10a1. In this embodiment, the main plate 10a is provided with a plurality of through holes 10a1.

[0039] The edge cover 10b is a frame-shaped body attached along the outer peripheral edge of the main plate 10a. In other words, the edge cover 10b is an annular member having an opening 10b1. The edge cover 10b may be a single integrally molded part or may be divided into multiple parts. In this embodiment, the edge cover 10b is divided into multiple parts. In other words, the edge cover 10b is composed of multiple parts. Furthermore, the edge cover 10b is not limited to a closed annular shape, but may also have an annular shape that is partially interrupted by openings at one or more locations in the annular shape. The edge cover 10b is made of, for example, a resin material. As an example, the edge cover 10b is made of polyvinyl chloride (PVC), but is not limited to this. The edge cover 10b may also be made of a rubber material having rubber elasticity.

[0040] The inner circumferential surface of the edge cover 10b is provided with a fitting portion into which the outer circumferential end of the main plate 10a is fitted from the side. When the main plate 10a is fitted into the fitting portion of the edge cover 10b, it is raised above the tread surface 200. In other words, the edge cover 10b creates a gap between the main plate 10a and the tread surface 200. Therefore, the edge cover 10b becomes the leg of the first base 11. In this way, only the edge cover 10b is in contact with the tread surface 200, and the main plate 10a is not in contact with the tread surface 200. However, the main plate 10a may also be in contact with the tread surface 200.

[0041] The surface sheet 10c is a sheet material laid on the upper surface of the main plate 10a. The surface sheet 10c is stepped on by the user when the user walks up the stairs 100 using the freestanding handrail 1. Therefore, it is preferable that the surface of the surface sheet 10c has an anti-slip structure such as an uneven shape. The surface sheet 10c may be a metal sheet, a resin sheet, a carpet, or a mat.

[0042] An opening 10c1 is provided in the surface sheet 10c. A first support column 21 is positioned in the opening 10c1. The first support column 21 is positioned in this opening 10c1 and fixed to the main plate 10a. The shape of the opening 10c1 corresponds to the shape of the base portion of the first support column 21. In this embodiment, the shape of the opening 10c1 is substantially rectangular.

[0043] The surface sheet 10c is provided with a plurality of openings 10c1. The plurality of openings 10c1 are arranged along the longitudinal direction of the surface sheet 10c. In this embodiment, the surface sheet 10c is provided with five openings 10c1. Of the five openings 10c1, the openings 10c1 provided at both ends in the longitudinal direction of the surface sheet 10c are notches formed by cutting out a part of the surface sheet 10c. As shown in Figures 1 to 3, in this embodiment, the first support column 21 is positioned in the innermost opening 10c1 at the corner portion 110, i.e., in the tapered portion 11a region. The position of the first support column 21 in one of the five openings 10c1 can be appropriately selected according to the position of the second support column 22 erected on the second base 12 and the position of the third support column 23 erected on the third base 13, as well as according to the installation angle of the first base 11.

[0044] The first base 11 may also have a reinforcing plate laminated on the main plate 10a. This allows the first base 11 to be stably placed on the tread 200 by its own weight. If the main plate 10a is made of steel, a stainless steel plate can be used as the reinforcing plate. The first base 11 may also have an adjuster mechanism that allows the height from the tread 200 to be adjusted.

[0045] As shown in Figures 1 to 3, the plan view shapes of the second base 12 and the third base 13 are rectangular. Specifically, the plan view shapes of the second base 12 and the third base 13 are rectangular.

[0046] In this embodiment, the depth of the second base 12 and the depth of the third base 13 are different. Specifically, the depth of the second base 12 is shorter than the depth of the third base 13. However, the depth of the second base 12 may be longer than the depth of the third base 13, or it may be the same as the depth of the third base 13.

[0047] Furthermore, the width of the second base 12 and the width of the third base 13 are the same, but the width of the second base 12 and the width of the third base 13 may be different. In other words, the width of the second base 12 may be longer than the width of the third base 13, or shorter than the width of the third base 13. Moreover, the width of the second base 12 and the width of the third base 13 are the same as the width of the first base 11, but are not limited to this. The width of the second base 12 and the width of the third base 13 may be different from the width of the first base 11. In other words, the width of the second base 12 and the width of the third base 13 may be longer than the width of the first base 11, or shorter than the width of the first base 11. Thus, the multiple bases 10 installed on the tread surface 200 may all have the same length in the longitudinal direction, or some of the multiple bases 10 may have bases 10 with different lengths in the longitudinal direction.

[0048] Furthermore, the plan view shapes of the second base 12 and the third base 13 may be squares instead of rectangles. Also, the plan view shapes of the second base 12 and the third base 13 may be octagonal, similar to the first base 11.

[0049] The second base 12 and the third base 13, like the first base 11, have a main plate, an edge cover, and a surface sheet. The main plate, edge cover, and surface sheet in the second base 12 and the third base 13 differ only in their planar shape from the main plate 10a, edge cover 10b, and surface sheet 10c in the first base 11.

[0050] The support column 20 is fixed to the base 10. Specifically, the support column 20 is fixed to the base 10 in an upright position. The support column 20 is attached to each of the multiple bases 10. Therefore, the self-supporting handrail 1 has multiple support columns 20. In this embodiment, the self-supporting handrail 1 has three support columns 20. Specifically, the self-supporting handrail 1 has three support columns 20: a first support column 21, a second support column 22, and a third support column 23. The first support column 21 is an intermediate support column located between the second support column 22 and the third support column 23. The first support column 21 is erected on the first base 11, the second support column 22 is erected on the second base 12, and the third support column 23 is erected on the third base 13. The first base 11 on which the first support column 21 is erected is an intermediate base.

[0051] Each support column 20 may also have a height adjustment mechanism that allows for adjustment of the height (length) of the support column 20. This allows for adjustment of the height of the support column 20.

[0052] The support column 20 supports the handrail 30. In this embodiment, the freestanding handrail 1 is equipped with a plurality of handrails 30. Specifically, the freestanding handrail 1 is equipped with a first handrail 31 and a second handrail 32 as a plurality of handrails 30. The first support column 21, the second support column 22, and the third support column 23 support the first handrail 31 and the second handrail 32. In addition, the second support column 22 also supports a handrail 41, and the third support column 23 also supports a handrail 42.

[0053] The handrails 30 (first handrail 31, second handrail 32), 41 and 42 are handrails that the user grasps with their hands when walking up the stairs 100 using the freestanding handrail 1.

[0054] The handrail bars 30 (first handrail bar 31, second handrail bar 32) are rod-shaped handrails that extend in a straight line. On the other hand, the handrail bars 41 and 42 are curved handrails that are formed in a curved shape.

[0055] The handrails 30 (first handrail 31, second handrail 32) are located between the two support posts 20 and are supported by being stretched across the two support posts 20. Specifically, the first handrail 31 is located between the first support post 21 and the second support post 22 and is stretched across the first support post 21 and the second support post 22. The second handrail 32 is located between the first support post 21 and the third support post 23 and is stretched across the first support post 21 and the third support post 23.

[0056] The first handrail 31 extends along the linear direction (walking direction) of the first straight section 120 of the stairs 100. As shown in Figure 3, in a top view, the first handrail 31 spans both the first straight section 120 and the corner section 110. On the other hand, the second handrail 32 extends along the linear direction (walking direction) of the second straight section 130 of the stairs 100. In a top view, the second handrail 32 spans both the second straight section 130 and the corner section 110. Therefore, the extending direction of the first handrail 31 and the extending direction of the second handrail 32 are perpendicular to each other.

[0057] Each of the first handrail 31 and the second handrail 32 is connected to the first support column 21. Specifically, one end of the first handrail 31 is connected to the first support column 21 via a first connecting part 61 and a support part 50, and one end of the second handrail 32 is connected to the first support column 21 via a second connecting part 62 and a support part 50.

[0058] Furthermore, the first handrail 31 is connected to the second support column 22. Specifically, the other end of the first handrail 31 is connected to the second support column 22 via the third connecting part 63 and the handrail 41.

[0059] Furthermore, the second handrail 32 is connected to the third support column 23. Specifically, the other end of the second handrail 32 is connected to the third support column 23 via the fourth connecting part 64 and the handrail 42.

[0060] As shown in Figures 1 to 3, the first handrail 31 has a handrail portion 31a and a pair of connecting portions 31b. The second handrail 32 has a handrail portion 32a and a pair of connecting portions 32b.

[0061] The handrail portion 31a constitutes the main body of the first handrail 31, and the handrail portion 32a constitutes the main body of the second handrail 32. The handrail portions 31a and 32a are the parts that the user grips and are formed in the shape of a straight rod with a circular outer surface in cross-section. The shape of the handrail portions 31a and 32a is not limited to this, and for example, a part of them may be partially curved. As an example, the handrail portions 31a and 32a include rod-shaped parts such as metal pipes or metal columns made of a metal material such as aluminum. The handrail portions 31a and 32a may be made of materials other than metal. For example, the handrail portions 31a and 32a may be made of resin material. Each of the handrail portions 31a and 32a may be made of one rod-shaped part or multiple rod-shaped parts. For example, if each of the handrail portions 31a and 32a is an extendable handrail configured to be extendable, each of the handrail portions 31a and 32a may be made of multiple rod-shaped parts. In this case, for example, the structure would be such that one pipe is inserted into the other of two rod-shaped pipes.

[0062] In the first handrail 31, the pair of connecting parts 31b are located at the ends of the first handrail 31 and are attached to both ends of the handrail section 31a in the longitudinal direction. That is, one of the pair of connecting parts 31b is attached to one end of the handrail section 31a in the longitudinal direction, and the other of the pair of connecting parts 31b is attached to the other end of the handrail section 31a in the longitudinal direction. Furthermore, one of the pair of connecting parts 31b is connected to the first connecting part 61, and the other of the pair of connecting parts 31b is connected to the third connecting part 63.

[0063] Furthermore, in the second handrail 32, the pair of connecting parts 32b are located at the ends of the second handrail 32 and are attached to both ends of the handrail section 32a in the longitudinal direction. That is, one of the pair of connecting parts 32b is attached to one end of the handrail section 32a in the longitudinal direction, and the other of the pair of connecting parts 32b is attached to the other end of the handrail section 32a in the longitudinal direction. Also, one of the pair of connecting parts 32b is connected to the second connecting part 62, and the other of the pair of connecting parts 32b is connected to the fourth connecting part 64.

[0064] The connecting portion 31b of the first handrail 31 and the connecting portion 32b of the second handrail 32 are joint parts and are made of metal or resin material. The first connecting portion 61, the second connecting portion 62, the third connecting portion 63, and the fourth connecting portion 64 are also joint parts and are made of metal or resin material.

[0065] As shown in Figures 6 to 8, a support part 50 is attached to the first support column 21. The support part 50 is fixed to the upper end of the first support column 21. The support part 50 is fixed to the first support column 21 so as not to move relative to the first support column 21.

[0066] In this embodiment, the support portion 50 has a T-shape when viewed from the front, and includes an arm portion extending laterally and a leg portion provided in the center of the arm portion. The leg portion of the support portion 50 is fixed to the upper end of the first support column 21 with screws. The support portion 50 may be made of a metal material, a resin material, or a combination of a metal material and a resin material.

[0067] The support section 50 is an intermediate member located between the first handrail 31 and the second handrail 32. The first handrail 31 and the second handrail 32 are connected via the support section 50. In other words, the support section 50 has a connecting function that links the first handrail 31 and the second handrail 32. The first handrail 31 and the second handrail 32 are connected via the support section 50 so as to form a right angle at the corner section 110 of the stairs 100.

[0068] In this embodiment, the first handrail 31 and the support portion 50 are connected via a first connecting portion 61. The second handrail 32 and the support portion 50 are connected via a second connecting portion 62. The first connecting portion 61 is connected to one end of the arm portion of the support portion 50 in the longitudinal direction, and the second connecting portion 62 is connected to the other end of the arm portion of the support portion 50 in the longitudinal direction.

[0069] Furthermore, the support portion 50 fixed to the first support column 21 rotatably supports the first handrail 31 and the second handrail 32. Specifically, the support portion 50 rotatably supports the first handrail 31 via the first connecting portion 61 and rotatably supports the second handrail 32 via the second connecting portion 62.

[0070] The first connecting portion 61 is rotatably connected to the support portion 50. Specifically, the first connecting portion 61 is connected to the support portion 50 by a bolt 61a, and can rotate around the axis of rotation of the bolt 61a. In other words, the first connecting portion 61 and the support portion 50 form a hinge, and by rotating the first connecting portion 61 relative to the support portion 50, the angle between the longitudinal direction of the first handrail 31 connected to the first connecting portion 61 and the longitudinal direction of the first support column 21 can be adjusted. In other words, the first handrail 31 can be rotated vertically around the axis of rotation of the bolt 61a.

[0071] Furthermore, the first handrail 31 and the first connecting portion 61 are rotatably connected to each other. Specifically, the connecting portion 31b of the first handrail 31 and the first connecting portion 61 are connected by a bolt 61b, and the first handrail 31 and the first connecting portion 61 can rotate around the axis of rotation of the bolt 61b. Therefore, a hinge is formed between the connecting portion 31b of the first handrail 31 and the first connecting portion 61, and the first handrail 31 can be rotated horizontally around the longitudinal direction of the first support column 21 in a plane that includes the longitudinal direction of the first handrail 31. In other words, the first handrail 31 can be rotated around the longitudinal direction of the first support column 21 as the axis of rotation.

[0072] Thus, the first handrail 31 is rotatable relative to the first support column 21 by the first connecting portion 61 and the support portion 50. Specifically, as described above, the first handrail 31 can rotate such that the angle between the longitudinal direction of the first handrail 31 and the longitudinal direction of the first support column 21 is changed, and it can also rotate with the longitudinal direction of the first support column 21 as the axis of rotation. Therefore, the first handrail 31 can change its orientation relative to the first support column 21 and the support portion 50 fixed to the first support column 21. Specifically, the first handrail 31 can freely change its orientation so as to draw a cone with the first support column 21 and the support portion 50 as its vertices.

[0073] Furthermore, the second connecting portion 62 is rotatably connected to the support portion 50, similar to the first connecting portion 61. Specifically, the second connecting portion 62 is connected to the support portion 50 by a bolt 62a, and can rotate around the axis of the bolt 62a as the center of rotation. In other words, the second connecting portion 62 and the support portion 50 form a hinge, and by rotating the second connecting portion 62 relative to the support portion 50, the angle between the longitudinal direction of the second handrail 32 connected to the second connecting portion 62 and the longitudinal direction of the first support column 21 can be adjusted. That is, the second handrail 32 can be rotated vertically around the axis of rotation of the bolt 62a.

[0074] Furthermore, the second handrail 32 and the second connecting portion 62 are rotatably connected to each other. Specifically, the connecting portion 32b of the second handrail 32 and the second connecting portion 62 are connected by a bolt 62b, and the second handrail 32 and the second connecting portion 62 can rotate around the axis of rotation of the bolt 62b. Therefore, a hinge is formed between the connecting portion 32b of the second handrail 32 and the second connecting portion 62, and the second handrail 32 can be rotated horizontally around the longitudinal direction of the first support column 21 in a plane that includes the longitudinal direction of the second handrail 32. In other words, the second handrail 32 can be rotated around the longitudinal direction of the first support column 21 as the axis of rotation.

[0075] Thus, the second handrail 32 is rotatable relative to the first support column 21 by the second connecting portion 62 and the support portion 50. Specifically, as described above, the second handrail 32 can rotate such that the angle between the longitudinal direction of the second handrail 32 and the longitudinal direction of the first support column 21 is changed, and it can also rotate with the longitudinal direction of the first support column 21 as the axis of rotation. Therefore, the second handrail 32 can change its orientation relative to the first support column 21 and the support portion 50 fixed to the first support column 21, just like the first handrail 31. Specifically, the second handrail 32 can freely change its orientation so as to draw a cone with the first support column 21 and the support portion 50 as its vertices.

[0076] Furthermore, the first handrail 31 is connected to the handrail 41 via a third connecting portion 63. The third connecting portion 63 is fixed to the handrail 41 which is attached to the second support column 22. In this embodiment, the first handrail 31 is rotatably connected to the third connecting portion 63. Although not shown in detail, the connecting portion 31b of the first handrail 31 and the third connecting portion 63 are connected by a bolt, and the first handrail 31 can rotate around the axis of rotation of the bolt. In other words, a hinge is formed between the connecting portion 31b of the first handrail 31 and the third connecting portion 63, and by rotating the first handrail 31 relative to the third connecting portion 63, the angle between the longitudinal direction of the first handrail 31 and the longitudinal direction of the second support column 22 can be adjusted. In other words, the first handrail 31 can be rotated vertically around the axis of rotation of the bolt that connects the first handrail 31 and the third connecting portion 63. Furthermore, the first handrail 31 may be configured to rotate around the longitudinal direction of the second support column 22.

[0077] Thus, the first handrail 31 is not only rotatable relative to the first support column 21, but also rotatable relative to the second support column 22.

[0078] Furthermore, the second handrail 32 is connected to the handrail 42 via a fourth connecting portion 64. The fourth connecting portion 64 is fixed to the handrail 42 which is attached to the third support column 23. In this embodiment, the second handrail 32 is rotatably connected to the fourth connecting portion 64. Although not shown in detail, the connecting portion 32b of the second handrail 32 and the fourth connecting portion 64 are connected by a bolt, and the second handrail 32 can rotate around the axis of rotation of the bolt. In other words, a hinge is formed between the connecting portion 32b of the second handrail 32 and the fourth connecting portion 64, and by rotating the second handrail 32 relative to the fourth connecting portion 64, the angle between the longitudinal direction of the second handrail 32 and the longitudinal direction of the third support column 23 can be adjusted. In other words, the second handrail 32 can be rotated vertically around the axis of rotation of the bolt that connects the second handrail 32 and the fourth connecting portion 64. Furthermore, the second handrail 32 may be configured to rotate around the longitudinal direction of the third support column 23.

[0079] Thus, the second handrail 32 is not only rotatable relative to the first support column 21, but also rotatable relative to the third support column 23.

[0080] As shown in Figures 1 to 3, the self-supporting handrail 1 configured as described above can be installed on a curved staircase 100. In this embodiment of the self-supporting handrail 1, the first handrail rod 31 and the second handrail rod 32 can freely change their orientation relative to the first support column 21. Furthermore, the first handrail rod 31 can also change its orientation relative to the second support column 22, and the second handrail rod 32 can also change its orientation relative to the third support column 23.

[0081] As a result, when installing the freestanding handrail 1 on a curved staircase 100, when the first base 11 on which the first support column 21 is erected is installed on the corner tread 210 of the corner section 110 of the staircase 100, the orientation and inclination of the first handrail rod 31 and the second handrail rod 32 can be easily adjusted to match the orientation of the staircase 100 (the orientation of the first straight section 120 and the second straight section 130) and the inclination of the staircase 100 (the inclination of the first straight section 120 and the second straight section 130). Therefore, the freestanding handrail 1 can be easily installed on the staircase 100 in accordance with the orientation and inclination of the staircase 100.

[0082] In the self-supporting handrail 1 according to this embodiment, when the first base 11 is installed on the corner tread 210 of the corner portion 110 of the stairs 100, the first base 11 has a tapered portion 11a that narrows inward toward the corner portion 110 of the stairs 100. In this embodiment, the tapered portion 11a narrows toward the tip of the tapered surface 211 of the corner tread 210. Specifically, the top view shape of the first base 11 is an elongated octagon.

[0083] This allows the first base 11, which has a shape suitable for the shape of the corner tread 210, to be installed on the corner tread 210. Specifically, by using the first base 11 which has a tapered portion 11a, the first base 11 can be installed closer to the edge of the corner tread 210 (for example, near the tip of the tapered surface 211 of the corner tread 210) compared to when a rectangular base is installed on the corner tread 210. This makes it possible to install the self-supporting handrail 1 even on curved stairs with narrow treads 200. Moreover, by providing the tapered portion 11a on the first base 11, the width of the first base 11 can be increased, allowing it to be installed closer to the edge of the corner tread 210. This makes it easy to secure the required weight of the first base 11 and increases the width of the passage for the user on the first base 11. As a result, even when installed on a curved staircase 100, a self-supporting handrail 1 with superior safety can be realized. Thus, by using the first base 11 in this embodiment, a self-supporting handrail 1 that can be appropriately installed on a curved staircase can be realized.

[0084] In this embodiment, the handrail 30 was provided on the inner part of the stairs 100, but this is not limited to this. For example, the handrail 30 may be provided on the outer part of the stairs 100. In other words, in this embodiment, the support column 20 was provided on the base 10 so as to be located on the inner part of the stairs 100, but it may also be provided on the base 10 so as to be located on the outer part of the stairs 100.

[0085] (Embodiment 2) Next, the freestanding handrail 1A according to Embodiment 2 will be described with reference to Figure 9. Figure 9 is a top view of the freestanding handrail 1A according to Embodiment 2 installed on the stairs 100.

[0086] In the above embodiment 1, the freestanding handrail 1 had a single-handrail structure, with the handrail rod 30 provided on only one of the inner or outer portions of the stairs 100. However, as shown in Figure 9, the freestanding handrail 1A in this embodiment has a double-handrail structure, with the handrail rod 30 provided on both the inner and outer portions of the stairs 100.

[0087] Specifically, in this embodiment, the first support columns 21 erected on the first base 11 installed on the corner tread 210 are provided in pairs along the longitudinal direction of the first base 11. Similarly, the second support columns 22 erected on the second base 12 installed on the straight tread 220 are provided in pairs along the longitudinal direction of the second base 12. Likewise, the third support columns 23 erected on the third base 13 installed on the straight tread 230 are provided in pairs along the longitudinal direction of the third base 13.

[0088] Furthermore, a pair of first handrails 31 are also provided. Each of the pair of first handrails 31 is stretched between the first support column 21 and the second support column 22.

[0089] Specifically, the inner first handrail 31 of a pair of first handrails 31 is spanned between the inner first support 21 of a pair of first support posts 21 and the inner second support post 22 of a pair of second support posts 22. In this embodiment, the inner first handrail 31 is a single handrail and, as in Embodiment 1 above, is spanned between the inner first support post 21 and the inner second support post 22.

[0090] Furthermore, the outer first handrail 31 of the pair of first handrails 31 is spanned between the outer first support 21 of the pair of first support columns 21 and the outer second support column 22 of the pair of second support columns 22. However, unlike the inner first handrail 31, the outer first handrail 31 is divided into multiple handrails (divided into two in Figure 9), and is spanned between the outer first support column 21 and the outer second support column 22 via the fourth support column 24 erected on the fourth base 14. The fourth base 14 is positioned between the first base 11 and the second base 12 with multiple treads 200 in between. The inner first handrail 31 of the pair of first handrails 31 is not connected to the fourth support column 24, and crosses the fourth base 14 at an angle.

[0091] Between the pair of first support posts 21 and the pair of second support posts 22, the distance between the pair of first handrails 31 is constant. The user can move between the pair of first handrails 31 while grasping the pair of first handrails 31 with both hands.

[0092] Additionally, a pair of second handrails 32 are provided. Each of the pair of second handrails 32 is stretched between the first support column 21 and the third support column 23.

[0093] Specifically, the inner second handrail 32 of a pair of second handrails 32 is spanned between the inner first support 21 of a pair of first support posts 21 and the inner third support post 23 of a pair of third support posts 23.

[0094] Furthermore, the outer second handrail 32 of the pair of second handrails 32 is stretched between the outer first support 21 of the pair of first support 21 and the outer third support 23 of the pair of third support 23.

[0095] Between the pair of first support posts 21 and the pair of third support posts 23, the distance between the pair of second handrails 32 is constant. The user can move between the pair of second handrails 32 while grasping the pair of second handrails 32 with both hands.

[0096] As described above, the self-supporting handrail 1A according to this embodiment has a pair of first handrails 31 and a pair of second handrails 32, so even if there is a corner 110 on the stairs 100, the user can walk up the stairs 100 while grasping the pair of first handrails 31 and the pair of second handrails 32 with both hands. This allows the user to walk up the stairs 100 more safely.

[0097] Furthermore, in the self-supporting handrail 1A according to this embodiment, similar to the first embodiment described above, the first base 11 installed on the corner tread 210 has a tapered portion 11a that tapers towards the tip of the tapered surface 211 of the corner tread 210.

[0098] This provides the same effects as in Embodiment 1 described above. Specifically, the width of the first base 11 can be increased so that it can be installed further towards the tapered surface 211 of the corner tread 210. As a result, the required weight of the first base 11 can be easily secured, and the width of the passage for the user on the first base 11 can be increased, thus realizing a self-supporting handrail 1A with superior safety. Therefore, a self-supporting handrail 1A that can be appropriately installed on curved stairs can be realized.

[0099] Furthermore, as shown in Figure 9, in the self-supporting handrail 1A of this embodiment, the first base 11 is installed on the middle corner tread 210 of the three consecutive corner treads 210.

[0100] This makes it possible to realize a freestanding handrail 1A that can be installed more appropriately on curved staircases. This point will be explained using the modified freestanding handrail 1X shown in Figure 10.

[0101] As shown in Figure 10, if bases 11X are installed on two of the three consecutive corner treads 210, excluding the middle one, it becomes impossible to increase the width of the bases 11X. In this case, even if the bases 11X are made into an elongated octagon, as in the self-supporting handrail 1X shown in Figure 10, it is not possible to increase the width of the bases 11X, and even more so if the bases 11X are rectangular. For this reason, in order to secure the desired passage width for users to pass over the bases 11X, only one support column 20 can be attached to the bases 11X installed on the corner treads 210.

[0102] As a result, as shown in Figure 10, the connection between the first handrail 31 and the second handrail 32 at the corner 110 cannot be supported by the support column 20. Therefore, even though the connection between the first handrail 31 and the second handrail 32 is a point where more load is placed when the user grasps the handrail 30 and walks up the stairs 100, the strength of the connection between the first handrail 31 and the second handrail 32 is weakened. In particular, the connection between the outer first handrail 31 and the outer second handrail 32 becomes weaker. Consequently, the safety of the self-supporting handrail 1X is reduced.

[0103] Furthermore, in the self-supporting handrail 1X shown in Figure 10, in order to support the first handrail 31 and the second handrail 32, the number of bases 10X for attaching the support columns 20 that support the first handrail 31 and the second handrail 32 must be increased, resulting in a large total number of bases 10X in the entire self-supporting handrail 1X.

[0104] In contrast, in the self-supporting handrail 1A shown in Figure 9, the first base 11 is installed on the middle corner tread 210 of the three consecutive corner treads 210.

[0105] This allows the width of the first base 11 to be increased, so that the connection between the first handrail 31 and the second handrail 32 can be supported by the first support column 21. Moreover, the connection between the inner first handrail 31 and the inner second handrail 32 can be supported by the inner first support column 21, and the connection between the outer first handrail 31 and the outer second handrail 32 can be supported by the outer first support column 21. This increases the strength of the connection between the first handrail 31 and the second handrail 32. Furthermore, the increased strength of the connection between the first handrail 31 and the second handrail 32 reduces the number of bases 10 required to attach the support columns 20 that support the first handrail 31 and the second handrail 32. As a result, a self-supporting handrail 1A that can be installed more appropriately on curved stairs can be realized.

[0106] This also applies to Embodiment 1 described above. In other words, in the self-supporting handrail 1 of Embodiment 1, the first base 11 is installed on the middle corner tread 210 of the three consecutive corner treads 210. This makes it possible to increase the strength of the connection between the first handrail 31 and the second handrail 32, and to reduce the number of bases 10 that need to be installed.

[0107] (modified version) Although the pedestal for a self-supporting handrail and the self-supporting handrail device according to the present invention have been described above based on embodiments, the present invention is not limited to the above embodiments.

[0108] For example, in the above embodiment 1, the first connecting portion 61 and the second connecting portion 62 were configured to be rotatable relative to the support portion 50, but the invention is not limited to this. Specifically, as shown in Figure 11, the first connecting portion 61A and the second connecting portion 62A may be fixed to the support portion 50A so as not to move relative to the support portion 50A. In this case, the first connecting portion 61A and the second connecting portion 62A and the support portion 50A may be integrally molded parts. In this modified example, the support portion 50A may be a handrail portion that is grasped by the user. In other words, the support portion 50A may have not only a connecting function but also a handrail function. If the support portion 50A is a handrail portion, if the support portion 50A is too short, the user will not be able to grasp it, so considering the width of an adult's hand, the length of the support portion 50A should be at least 80 mm, more preferably 100 mm or more.

[0109] Furthermore, in the above embodiment 1, the support portion 50 was fixed to the first support column 21 so as not to move relative to the first support column 21, but this is not limited to this. Specifically, as shown in Figure 12, the support portion 50B may be configured to rotate relative to the first support column 21. In this case, by connecting the connecting portion 51 provided on the support portion 50B and the connecting portion 21a provided on the first support column 21 with a bolt 51a, the support portion 50B can be rotated using the axis of the bolt 51a as the axis of rotation. Note that the support portion 50B may also function as a handrail, similar to the support portion 50A described above.

[0110] Furthermore, as shown in Figure 13, the support portion 50C may be composed of a first support portion 50a and a second support portion 50b, and the first support portion 50a and the second support portion 50b may be connected by a bolt 51b. This allows the first support portion 50a and the second support portion 50b to rotate relative to each other with the axis of the bolt 51a as the axis of rotation. In addition, the support portion 50C and the first connecting portion 61A may be configured to rotate around the central axis of the first handrail 31 as the center of rotation. Alternatively, the support portion 50C and the second connecting portion 62A may be configured to rotate around the central axis of the second handrail 32 as the center of rotation.

[0111] In addition, in Figures 12 and 13, the first connecting portion 61A and the second connecting portion 62A may be configured to be rotatable with respect to the support portions 50B and 50C, similar to the first embodiment described above.

[0112] Furthermore, in embodiments 1 and 2 described above, the top view shape of the first base 11 was an elongated octagon (long octagon), but it is not limited to this. For example, the top view shape of the first base 11 may be an elongated polygon other than an octagon. Specifically, the top view shape of the first base 11 may be an elongated pentagon or elongated hexagon, or an elongated rhombus, or an elongated triangle. Moreover, the top view shape of the first base 11 is not limited to an elongated polygon. For example, the top view shape of the first base 11 may be an oval, an elongated ellipse, or an elongated fan. In other words, as long as the first base 11 has a tapered portion that narrows inward toward the corner portion 110, the top view shape of the first base 11 can be any shape.

[0113] Furthermore, in embodiments 1 and 2 described above, the first base 11 had tapered portions 11a and 11b, but it is not limited to this. Specifically, the first base 11 may have only the tapered portion 11a among the tapered portions 11a and 11b.

[0114] Furthermore, although the stairs 100 in embodiments 1 and 2 described above were curved stairs, the invention is not limited to this. In other words, the freestanding handrail 1 may be installed on stairs other than curved stairs. For example, the freestanding handrail 1 may be installed on straight stairs. In this case, the freestanding handrail 1 may be installed on stairs with one to three steps, such as earthen floor stairs, or on stairs with three or more steps. In addition, the freestanding handrail 1 can be installed in places other than stairs. For example, the freestanding handrail 1 may be installed on a flat surface such as an indoor floor or the ground outdoors.

[0115] Furthermore, the present invention also includes forms obtained by applying various modifications to the above embodiments that a person skilled in the art could conceive, and forms realized by arbitrarily combining the components and functions of the above embodiments without departing from the spirit of the present invention. In addition, the present invention also includes arbitrary combinations of one or more components from each of the multiple claims described in the claims of the present application. Furthermore, when the cited claims described in the claims of the present application are made into a multi-claim or multi-multi-claim that cites any multiple claims (for example, when each claim is made into a multi-claim or multi-multi-claim that cites all of the higher-level claims), all forms obtained by combinations of all claims included in that multi-claim or multi-multi-claim are also included in the present invention. [Explanation of Symbols]

[0116] 1, 1A, 1X Freestanding Handrail 10, 10X, 11X base 11. First Pedestal 11a, 11b Tapered section 20 pillars 21 1st pillar 22 Second pillar 30 Handrails 31. First handrail 50, 50A, 50B, 50C Support part 100 stairs 110 Corner section 210 Corner tread

Claims

1. A base for a freestanding handrail installed on a curved staircase, A support column for the handrail is erected on the aforementioned base. The base has a tapered portion that narrows inward toward the inside of the corner when installed on the corner tread of the curved staircase. A base for a freestanding handrail.

2. The top view shape of the aforementioned base is an elongated polygon. A base for a self-supporting handrail as described in claim 1.

3. The top view shape of the aforementioned base is an elongated octagon. A base for a self-supporting handrail as described in claim 1.

4. The top view shape of the base is oblong, oblong, oblong rhombus, oblong triangle, or oblong fan shape. A base for a self-supporting handrail as described in claim 1.

5. A freestanding handrail installed on a curved staircase, The first base and, The first support column erected on the first base, A handrail supported by the first support column, The first base has a tapered portion that narrows toward the inside of the corner when installed on the corner tread of the curved staircase. Freestanding handrail.

6. The top view shape of the first base is an elongated polygon. The self-supporting handrail according to claim 5.

7. The top view shape of the first base is an elongated octagon. The self-supporting handrail according to claim 5.

8. The top view shape of the first base is oval, elliptical, rhombic, triangular, or sector-shaped. The self-supporting handrail according to claim 5.

9. At the aforementioned corner, three consecutive corner treads are provided with staggered steps. The first base is installed on the middle corner tread of the three consecutive corner treads. The self-supporting handrail according to claim 5.

10. moreover, The second base and It comprises a second support column erected on the second base, The aforementioned handrail is stretched between the first support post and the second support post. A freestanding handrail according to any one of claims 5 to 9.

11. The handrail is rotatable relative to the first support column. The self-supporting handrail according to claim 10.

12. The handrail is rotatable relative to the second support column. The self-supporting handrail according to claim 11.

13. Each of the first base and the second base is elongated, The first support columns are provided in pairs along the longitudinal direction of the first base, The second support columns are provided in pairs along the longitudinal direction of the second base, The aforementioned handrails are provided in pairs. The self-supporting handrail according to claim 10.

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