Armrest device

Abstract

The utility model provides a handrail device which is provided with a tubular handrail rod and a support which is installed at the end of the handrail rod and used for supporting and fixing the handrail rod, a plurality of continuous screw holes are formed in the inner side of the handrail rod in the length direction, and the screw holes are communicated with the handrail rod. The bracket is provided with an opposite part for bearing the end part of the grab rail and a boss part vertically arranged on the opposite part, the boss part is embedded and inserted between the screw holes in the inner side of the end part of the grab rail, a plurality of groove parts respectively extending along the length direction of the grab rail are arranged on the outer peripheral surface of the boss part, and the boss part is provided with a plurality of screw holes and a plurality of screw holes respectively extending along the length direction of the grab rail. Each screw hole enters one of the plurality of groove parts which is different from each other, a screw insertion hole penetrating through the opposite part is formed in the position, facing each groove part, of the opposite part, and a fixing screw is inserted into the screw insertion hole of the opposite part and is combined with the screw hole of the grab rail in a threaded mode.

Description

Technical Field

[0001] The utility model relates to a handrail device, which comprises a tubular handrail rod and a bracket which is installed on the end portion of the handrail rod to support and fix the handrail rod. Background Art

[0002] A handrail device is widely known, comprising a tubular handrail and a bracket mounted at the end of the handrail to support and secure the handrail. For example, a common method of mounting the handrail is to insert a portion of one of the handrail and bracket into the inner side of the other, thereby interlocking the two components, and then tightening the overlapping portion of the two components with a set screw in the transverse direction (i.e., perpendicular to the longitudinal direction of the handrail).

[0003] The disadvantage of this method of installation is that the head of the fixing screw for tightening is exposed to the outside, so that the user's hand may come into contact with the head of the screw. Therefore, a cap that hides the head of the screw is sometimes installed on the handrail device.

[0004] Instead of this installation method, a handrail device has been proposed in which a fixing screw inserted through the bracket from the inner side toward the outer side along the length of the handrail is threaded into a screw hole formed separately on the inner side of the handrail (for example, see Patent Document 1). In this handrail device, the head of the fixing screw can be housed within the bracket.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent document: Japanese Patent Application Publication No. 2018-155004 Utility Model Content

[0008] However, in handrail devices such as that disclosed in Patent Document 1, when a load is applied to the handrail, the load is concentrated at the bottom of the handrail receiving portion, where the fixing screws are inserted. This requires high strength to prevent damage to the bottom of the handrail receiving portion. Therefore, further research is required to achieve a handrail device with a higher load resistance.

[0009] In view of the above situation, the purpose of the present invention is to realize a handrail device with high load resistance.

[0010] In order to solve the above-mentioned problems, the present invention provides the following handrail device.

[0011] The hook at the bottom of the support leg is fixedly mounted on the support rail, and the hook at the bottom of the support rail is fixedly mounted on the support rail.

[0012] The handrail has an outer peripheral surface with a non-circular cross section orthogonal to the longitudinal direction. The groove portion into which the screw hole enters is selectively changed by rotating the handrail circumferentially, thereby installing the handrail on the opposing portion at different rotational positions centered on the boss portion.

[0013] The outer peripheral surface of the handrail rod has: a curved surface, which is curved outward on a cross section orthogonal to the longitudinal direction; and a flat surface, which connects the two circumferential ends of the curved surface. By rotating the handrail rod along the circumferential direction, the groove portion into which the screw hole enters is selectively changed, thereby installing the handrail rod on the opposing portion at different rotational positions of the flat surface.

[0014] Wherein, on the inner circumferential surface of the handrail corresponding to the curved surface, the two screw holes are provided at positions facing each other via the boss portion.

[0015] Wherein, a screw hole is further provided on the inner peripheral surface of the handrail corresponding to the flat surface at a position opposite to the boss portion.

[0016] The effects of the utility model are as follows.

[0017] In the present invention, multiple screw holes enter the multiple groove parts of the boss part, and the boss part supports the screw holes, thereby avoiding the load concentration on the screw insertion hole or the opposite part through which the fixing screw is inserted, thereby realizing a handrail device with higher load resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a perspective view of the appearance of the armrest device according to the first embodiment of the present invention.

[0019] Figure 2 Along the length direction Figure 1 A cross-sectional view of an armrest device.

[0020] Figure 3 Is perpendicular to the length direction Figure 1 A cross-sectional view of a handrail device near the end thereof.

[0021] Figure 4 It will Figure 1 A perspective view showing the vicinity of the end portion of the handrail device exploded into its constituent elements.

[0022] Figure 5 It will Figure 1 A perspective view showing the vicinity of the end portion of the handrail device exploded into its constituent elements.

[0023] Figure 6 This is a perspective view of the appearance of a handrail device in a usage mode in which the handrail rod extends in a horizontal direction perpendicular to the vertical direction.

[0024] Figure 7 It is perpendicular to the direction in which the handrail extends. Figure 6 A cross-sectional view of a handrail device near the end thereof.

[0025] Figure 8 It will Figure 6 A perspective view showing the vicinity of the end portion of the handrail device exploded into its constituent elements.

[0026] Figure 9 It is a cross-sectional view of the vicinity of an end portion of an armrest device according to a second embodiment of the present invention.

[0027] Figure 10 It is a cross-sectional view of the vicinity of an end portion of an armrest device according to a third embodiment of the present invention.

[0028] Reference numerals

[0029] 1. 1X, 1Y: Bracket, 1B: Bracket body, 1C: Bracket cover, 2. 2X, 2Y: Handrail, 2a: Opening, 2b: Flat surface, 2c: Curved surface, 3: Fixing screw, 4: Fixing member, 5: Wall, 11: Opposing portion, 11a, 11m, 11n: Screw insertion hole, 11b: Opposing surface, 11c: Non-opposing surface, 12. 12X, 12Y: Boss portion, 12a, 12m, 12n: Groove portion, 13: Side portion, 14: Base portion, 15: Rib, 21. 21X, 21Y: Screw hole, 22. 22X, 22Y: Core material, 23: Covering material, 31: Head. DETAILED DESCRIPTION

[0030] The following describes the embodiments of the present invention with reference to the accompanying drawings. It should be noted that the present invention is not limited to the following embodiments, and it should be understood that appropriate design changes and improvements can be made based on the common sense of those skilled in the art without departing from the scope of the present invention.

[0031] Figure 1 This is a perspective view of the appearance of the armrest device D1 according to the first embodiment of the present invention. Figure 2 Along the length direction Figure 1 A cross-sectional view of the handrail device D1, Figure 3 Is perpendicular to the length direction Figure 1 A cross-sectional view of the handrail device D1 near the end thereof. Figure 4 and Figure 5 It will Figure 1 A perspective view showing the vicinity of the end portion of the handrail device D1 exploded into its constituent elements.

[0032] like Figure 1 and Figure 2 As shown, the handrail device D1 of the first embodiment includes a bracket 1 and a handrail bar 2. The handrail bar 2 is a tubular member. The handrail device D1 in which the handrail bar 2 is arranged in a longitudinal direction will be described below. The bracket 1 is attached to the end of the handrail bar 2 (see Figure 5 ), is a component that supports and fixes the handrail 2 (refer to Figure 2 The bracket 1 is mounted and fixed to the wall 5 via the fixing member 4. In addition, the handrail device D1 of this embodiment further includes a fixing screw 3 for mounting and fixing the handrail bar 2 to the bracket 1 (see Figure 2 、 Figure 5 ). The following mainly describes the bracket 1 and the handrail 2.

[0033] First, the handrail 2 will be described. As mentioned above, the handrail 2 is a tubular component, and has a plurality of screw holes 21 on its inner side that are continuous along the longitudinal direction. The screw holes 21 are the parts of the handrail 2 to which the fixing screws 3 are screwed. Figure 3 and Figure 5 As shown, the handrail 2 has a hollow core material 22 extending in one direction and open at the end, and a covering material 23 surrounding the outer periphery of the core material 22 and extending in one direction, and the screw hole 21 is formed integrally with the core material 22 and is erected from the inner surface of the core material 22. The hollow core material 22 is made of a material with relatively high strength, and by forming the screw hole 21 integrally with such a core material 22, the load resistance of the handrail device D1 is further improved. In the present embodiment, the core material 22 is made of metal, and the covering material 23 is made of synthetic resin. However, in the present utility model, the handrail as a whole can be made of metal, or the handrail as a whole can be made of a resin with relatively high rigidity.

[0034] like Figure 3 and Figure 5As shown, the outer circumference of the handrail 2 has a curved surface 2c that curves outward in a cross-section perpendicular to the longitudinal direction, and flat surfaces 2b connecting the two circumferential ends of the curved surface 2c. Two screw holes 21 are provided on the inner circumference of the core material 22 of the handrail 2, corresponding to the curved surface 2c, at positions opposing each other via the boss portion 12. On the inner circumference of the core material 22 of the handrail 2, corresponding to the flat surface 2b, one screw hole 21 is provided at a position opposing the boss portion 12. This screw hole 21 is formed in the core material 22 via a rib.

[0035] The structure of the bracket 1 is described below. Figure 4 As shown, the bracket 1 is composed of a bracket body 1B and a bracket cover 1C, which are combined to form a bracket having the following structure: Figure 1 and Figure 2 The bracket 1 shown has a box-shaped appearance.

[0036] First, the bracket body 1B will be described. The bracket body 1B has Figure 2 The fixing member 4 is fixed to the base portion 14 of the wall 5, and the support portion 10 is erected on the base portion 14. The support portion 10 is composed of two side portions 13 and an opposing portion 11. The two side portions 13 extend from both ends of the base portion 14 along the Figure 5 The opposing portion 11 extends from the other end of the base portion 14 and the two side portions 13 integrally along Figure 5 Here, a vertical arrangement along the opposite portion 11 is provided. Figure 5 The opposing portion 11 and the boss portion 12 are described in detail below, including their functions.

[0037] The facing portion 11 is a portion that receives the end portion of the handrail 2. The facing portion 11 in this embodiment has a plate shape and is opposite to the opening 2a at the end portion of the handrail 2 (see FIG. Figure 5 ), with the opposing surface 11b of the opposing portion 11 (refer to Figure 4 ) is opposite to the end of the handrail 2. Figure 4 and Figure 5 As shown, in the opposing portion 11, there is provided a through hole from the opposing surface 11b to the non-opposing surface 11c (refer to Figure 5 ). The fixing screw 3 is inserted through the screw insertion hole 11a. The fixing screw 3 is inserted from the side of the non-opposing surface 11c opposite the opposing surface 11b. The inserted fixing screw 3 is threadedly engaged with the screw hole 21 of the handrail 2 as described above.

[0038] As described above, the boss portion 12 is a portion that is erected from the facing surface 11b of the facing portion 11 (see FIG. Figure 4). A plurality of grooves 12a are provided on the outer peripheral surface of the boss portion 12, extending along the longitudinal direction of the handrail 2. In this embodiment, four grooves 12a are provided on the outer peripheral surface of the boss portion 12 at intervals of 90 degrees. In addition, as Figure 4 As shown, the screw insertion holes 11a are respectively provided at positions facing the respective groove portions 12a in the opposing portion 11. Figure 3 As shown, the boss portion 12 is inserted between the screw holes 21 in the inner side of the end portion of the handrail 2. Each screw hole 21 of the handrail 2 enters a different one of the plurality of groove portions 12a.

[0039] In this embodiment, there are four screw insertion holes 11a. Three fixing screws 3, inserted through three of the screw insertion holes 11a, are threadedly engaged with the three screw holes 21, respectively, thereby allowing the handrail 2 to be mounted on the bracket 1. Furthermore, instead of using three fixing screws 3 and three screw holes 21, a mounting method using two fixing screws and two screw holes 21 can also be used. For example, when the fixing screws 3 have thinner screw portions, the mounting method using three fixing screws 3 and three screw holes 21 can be used; when the fixing screws 3 have thicker screw portions, the mounting method using two fixing screws 3 and two screw holes 21 can be used.

[0040] Next, the bracket cover 1C will be described. The bracket cover 1C is a part of the bracket's exterior and is a component that hides the inside of the bracket body. The bracket cover 1C is installed on the bracket body 1B in a state of covering the two side portions 13 of the bracket body 1B. When this is installed, Figure 4 The protrusion on the lower inner wall of bracket cover 1C engages with the recess formed in the lower portion of side portion 13 of bracket body 1B. Head 31 of fixing screw 3, located on non-opposing surface 11c of opposing portion 11, is completely shielded from the outside by bracket cover 1C. Consequently, in this embodiment, the user's hand is prevented from coming into contact with head 31 of fixing screw 3.

[0041] Furthermore, in this embodiment, the boss portion 12 supports the screw holes 21 by having the plurality of screw holes 21 fit into the plurality of recessed grooves 12a of the boss portion 12. In addition to the screw holes 21 being threadedly engaged with the fixing screws 3 inserted through the screw insertion holes 11a of the opposing portion 11, the boss portion 12 supporting the screw holes 21 improves the load resistance of the handrail device D1. In practice, when a load is applied to the handrail bar 2, the boss portion 12 and the screw holes 21 also bear the load, preventing the load from being concentrated on the screw insertion holes 11a for the fixing screws 3 or on the opposing portion 11.

[0042] As described above, in this embodiment, a handrail device D1 with high load resistance is realized.

[0043] Here, in this embodiment, the handrail 2 has a cross section perpendicular to the longitudinal direction (for example, see Figure 3 ) has a non-circular outer circumference. Furthermore, by rotating the handrail 2 circumferentially, the groove 12a into which the screw hole 21 enters is selectively changed, thereby allowing the handrail 2 to be attached to the opposing portion 11 at different rotational positions centered on the boss 12. It should be noted that the non-circular shape is not limited to the shape of this embodiment; examples include elliptical, oblong, and rectangular shapes.

[0044] This configuration allows the orientation of the outer peripheral surface of the handrail 2 to be appropriately changed depending on how the handrail device D1 is used. Furthermore, since the rotational position of the handrail 2 relative to the bracket body 1B is selected from a plurality of rotational positions corresponding to discrete rotational angles, the handrail 2 can be positioned relative to the bracket body 1B without uncertainty.

[0045] Specifically, if Figure 3 and Figure 5 As shown, the outer circumferential surface of the handrail 2 includes a curved surface 2c that curves outward in a cross section perpendicular to the longitudinal direction, and a flat surface 2b connecting the two circumferential ends of the curved surface 2c. Furthermore, by rotating the handrail 2 circumferentially, the groove 12a into which the screw hole 21 enters is selectively changed, and the handrail 2 is mounted on the opposing portion 11 at different rotational positions with the flat surface 2b facing in different directions.

[0046] For example, when Figure 4 When there are four grooves 12a at 90 degrees on the outer peripheral surface of the boss portion 12, there are four ways to select the three grooves 12a into which the three screw holes 21 enter. Here, the direction of the boss portion 12 ( Figure 5 The X direction of the handrail 2 is the rotation position of the handrail 2 in the direction of the rotation axis. That is, as a method for installing the handrail 2, four installation methods can be implemented in which the orientation of the flat surface 2b differs by 90 degrees. Figure 5 The following table shows the selection of the four installation methods so that the direction of the flat surface 2b is Figure 5 In the case of the upward installation method.

[0047] Here, in Figure 1 and Figure 2 In the embodiment, the handrail device D1 is installed on the wall 5 (refer to Figure 2 ) on the surface of the two brackets 1 at two positions separated in the vertical direction (refer to Figure 2 ).

[0048] In this case, by selecting the orientation of the flat surface 2b as described above, Figure 5In the method of installing the upward-facing handrail rod 2 , the handrail device D1 can be installed on the wall 5 in a manner such that the flat surface 2 b faces the side opposite to the wall 5 .

[0049] According to this method, the front side of the handrail 2 (the opposite side of the wall 5) is a flat surface 2b, and the back side (the side of the wall 5) is a curved surface 2c. Therefore, when the user grasps the handrail 2, the palm contacts the flat surface 2b and the fingers contact the curved surface 2c, thereby realizing a handrail device D1 that is easy for the user to grasp.

[0050] Here, as Figure 3 As shown, the height of the flat surface 2b of the front side (opposite side of the wall 5) of the handrail 2 that is easily noticed from the user side is the same as the upper end ( Figure 3 The upper end of the bracket 1 in the up and down directions is roughly the same.

[0051] As a result, in appearance, the flat surface 2b of the handrail rod 2 is smoothly connected to the upper end of the bracket 1 located on the extension thereof without a large height difference, thereby improving the aesthetics of the handrail device D1.

[0052] In addition, in this embodiment, Figure 3 and Figure 4 As shown, the boss portion 12 has a Figure 4 ) is provided in a cylindrical shape in an upright position. Furthermore, the boss portion 12 has a plurality of ribs 15 on its inner side. The ribs 15 are provided in an upright position from the opposing surface 11b and connect two positions of the inner peripheral surface of the boss portion 12.

[0053] The presence of such a plurality of ribs 15 strengthens the boss portion 12 and further improves the load resistance of the handrail device D1. Figure 3 and Figure 4 In FIG, two ribs 15 are shown as an example of such a plurality of ribs 15 .

[0054] In the above Figures 1 to 5 In the embodiment, as a usage mode of the handrail device D1, the case of an installation method in which the handrail rod 2 extends in the vertical direction (vertical configuration) is described. The following describes the cases of different installation methods using the handrail rod 2.

[0055] Figure 6 This is a perspective view of the appearance of the handrail device D1 in a usage mode (horizontally arranged) in which the handrail rod 2 extends in a horizontal direction perpendicular to the vertical direction. Figure 7 Is perpendicular to the direction in which the handrail 2 extends Figure 6 A cross-sectional view of the handrail device D1 near the end thereof. Figure 8 It will Figure 6A perspective view showing the vicinity of the end portion of the handrail device D1 exploded into its constituent elements.

[0056] like Figure 6 As shown, the handrail 2 is mounted on two brackets 1 disposed on the surface of the wall 5 at two positions spaced apart in a horizontal direction perpendicular to the vertical direction, and extends horizontally between the two brackets 1 .

[0057] exist Figures 6 to 8 In the horizontal configuration of the use of Figure 7 and Figure 8 As shown in FIG. 1 , the installation method is selected so that the flat surface 2b faces right. As a result, as shown in FIG. Figure 6 As shown, the flat surface 2b of the handrail 2 faces upward in the vertical direction ( Figure 6 direction of the upper side).

[0058] In such a horizontally configured usage mode of the handrail device D1, the upper side (vertically upward side) of the handrail bar 2 is a flat surface 2b, and the lower side (vertically downward side) is a curved surface 2c. Therefore, when the user grasps the handrail bar 2 from above, the palm contacts the flat surface 2b, and the fingers contact the curved surface 2c, thereby realizing a handrail device D1 that is easy for the user to grasp.

[0059] In the first embodiment described above, as a degree of freedom in the method of attaching the handrail 2 to the bracket 1, the handrail 2 can be attached to four rotational positions in which the orientations of the flat surface 2b of the handrail 2 differ by 90 degrees. Next, another embodiment of the handrail device of the present invention will be described in which the degree of freedom in the method of attaching the handrail to the bracket is smaller than that of the first embodiment.

[0060] In the armrest device D2 of the second embodiment, there are two methods of mounting the armrest on the bracket. Figure 9 It is a cross-sectional view of the vicinity of an end portion of a handrail device D2 according to a second embodiment of the present invention.

[0061] exist Figure 9Components identical to those in the first embodiment are denoted by the same reference numerals. For those identical components, reference will be made to the first embodiment described above, and repeated descriptions will be omitted. The handrail 2 of the first embodiment is formed so that its outer peripheral shape in a cross-section perpendicular to the longitudinal direction is line-symmetrical, while the handrail 2X of the second embodiment is formed so that its outer peripheral shape in a cross-section perpendicular to the longitudinal direction is line-symmetrical and point-symmetrical. Specifically, the handrail 2X of the second embodiment has an outer peripheral surface and an inner peripheral surface with a rectangular cross-section perpendicular to the longitudinal direction. Furthermore, the handrail 2X is provided with a pair of screw holes 21X on the short sides of the inner periphery of the core material 22X. The boss portion 12X of the bracket 1X is provided with grooves 12m at positions corresponding to the pair of screw holes 21X, and screw insertion holes 11m are formed in the opposing portion 11 at positions corresponding to each groove 12m. The boss portion 12X corresponds to the short side of the inner periphery of the core material 22X of the handrail 2X and is gently fitted into the interior of the core material 22X. Furthermore, the handle bar 2X can be attached to the bracket 1X even when rotated 180 degrees in the circumferential direction. The bracket 1X and the handle bar 2X are fixed by screwing the fixing screws 3 into the screw holes 21X through the screw insertion holes 11 of the facing portion 11 .

[0062] Next, a third embodiment of the present invention will be described. In the handrail device D3 of the third embodiment, there is one method of attaching the handrail bar to the bracket. Figure 10 It is a cross-sectional view of the vicinity of an end portion of a handrail device D3 according to a third embodiment of the present invention.

[0063] exist Figure 10 In the figure, the same components as those in the first embodiment are represented by the same reference numerals. For those same components, reference is made to the first embodiment described above, and their repeated description will be omitted. The armrest device D3 of the third embodiment differs from the armrest device D1 of the first embodiment in that, in the armrest device D3, the rotational position of the armrest bar 2Y relative to the bracket 1Y is fixed, and there is no freedom to selectively change the groove portion 12n into which the screw hole 21Y enters. Specifically, the outer peripheral surface of the boss portion 12Y is formed into a shape corresponding to the inner peripheral surface of the core material 22Y of the armrest bar 2Y. In addition, a pair of screw holes 21Y are provided on the core material 22Y of the armrest bar 2Y. In the boss portion 12Y of the bracket 1Y, groove portions 12n are respectively provided at positions corresponding to the pair of screw holes 21Y, and screw insertion holes 11n are formed in positions corresponding to each groove portion 12n in the opposing portion 11. Furthermore, when the boss portion 12Y is slowly fitted into the interior of the core material 22Y, the groove portion 12n into which the screw hole 21Y enters is predetermined. Figure 10 As described above, the direction of the flat surface 2b of the handrail 2Y is Figure 10Then, the bracket 1Y and the handrail 2Y are fixed by screwing the fixing screw 3 into the screw hole 21Y through the screw insertion hole 11n of the facing portion 11.

[0064] The above is the description of the embodiments of the present invention.

[0065] Although the handrail in the above embodiment has an outer peripheral surface whose cross section perpendicular to the longitudinal direction is not a perfect circle, the present invention is not limited thereto, and a handrail having a perfect circle outer peripheral surface may also be used.

[0066] In the description of the above embodiment, the direction in which the handrail extends is the vertical direction or the horizontal direction, but in the present invention, the direction in which the handrail extends is not the essence of the utility model. The handrail may also extend in other directions, such as in a direction inclined relative to the vertical direction.

[0067] In addition, in the above-mentioned embodiment, two brackets are respectively provided at both ends of a straight-line extending handrail rod, and each bracket has an opposing portion that supports the end of the handrail rod. However, the present invention can also be a handrail device that supports and fixes a plurality of handrail rods while using more than three brackets to connect the plurality of handrail rods. The present invention can be applied to various handrail devices, for example, an L-shaped handrail device assembled into an L shape by two handrail rods and three brackets, or a T-shaped handrail device assembled into an inverted T shape by three handrail rods and four brackets. In this case, the bracket provided at the connection point will be integrally mounted on the ends of the two or more handrail rods, and accordingly, will integrally have two or more opposing portions 11 that respectively support the ends of those two or more handrail rods.

[0068] Industrial applicability

[0069] The utility model is useful for realizing a handrail device with high load resistance.

Claims

1. A handrail device comprising a tubular handrail rod and a bracket mounted on the end of the handrail rod to support and fix the handrail rod, characterized in that: The handrail has a plurality of screw holes on the inner side thereof which are continuous along the length direction. The bracket includes an opposing portion for receiving the end portion of the handrail, and a boss portion erected on the opposing portion. The boss portion is inserted between the screw holes on the inner side of the end portion of the handrail. A plurality of grooves are provided on the outer peripheral surface of the boss portion and extend along the length direction of the handrail. Each of the screw holes enters a different one of the plurality of grooves. Screw insertion holes penetrating the opposing portion are respectively provided at positions facing the respective groove portions. A fixing screw is inserted into the screw insertion hole of the opposing portion and is threadedly engaged with the screw hole of the handrail.

2. The armrest device according to claim 1, characterized in that: The handrail has an outer peripheral surface with a non-circular cross section orthogonal to the length direction. The groove portion into which the screw hole enters is selectively changed by rotating the handrail in the circumferential direction, thereby attaching the handrail to the opposing portion at different rotational positions centered on the boss portion.

3. The armrest device according to claim 2, characterized in that: The outer peripheral surface of the handrail has: a curved surface that curves outward in a cross section perpendicular to the longitudinal direction; and a flat surface connecting the two circumferential ends of the curved surface, The groove portion into which the screw hole enters is selectively changed by rotating the handrail in the circumferential direction, thereby attaching the handrail to the opposing portion at different rotational positions facing the flat surface.

4. The armrest device according to claim 3, characterized in that: The two screw holes are provided at positions facing each other via the boss portion on the inner peripheral surface of the handrail corresponding to the curved surface.

5. The armrest device according to claim 4, characterized in that: The screw hole is further provided on the inner peripheral surface of the handrail corresponding to the flat surface at a position facing the boss portion.

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