JP2013017635A - Chair - Google Patents

Abstract

In a chair having an armrest that can be pivoted up and down, a lightweight and simple structure prevents a bolt and a nut that support the armrest from pivoting up and down.
A chair includes an armrest that is supported by a rod-like portion 12 so as to be rotatable up and down. The armrest is formed by an armrest hole 51a and 52a, a cover member hole 55a, a hole 18a of the mounting base 18, and a bolt 66 penetrating the hole 12a of the rod-shaped portion 12, and a nut 67 fastened to the tip of the bolt 66. The rod-like portion 12 is attached so as to be rotatable up and down. A collar member 65 is interposed between the inner peripheral surfaces of the holes 51a, 52a, 18a, and 12a and the bolt 66.
[Selection] Figure 6

Description

  The present invention relates to a chair that has an armrest that can be pivoted up and down and can be suitably used in a bathroom or the like.

  As a chair used by elderly people in a bathroom or the like, a chair having an armrest that can be pivoted up and down is often used. According to such a chair, the side of the seat can be opened by rotating the armrest upward (in other words, by flipping up the armrest). Therefore, for the elderly and the like, the operation of sitting on the seat becomes easy. In addition, it is preferable that a chair used in a narrow space such as a bathroom can be made compact by folding when not in use. According to a chair provided with an armrest that can be pivoted up and down, the armrest can be prevented from sticking out by rotating the armrest when folded, and can be made compact.

  Patent Document 1 discloses a chair provided with such an armrest. The armrest of the chair disclosed in Patent Document 1 is rotatably supported on the front leg and the rear leg via a hinge pin. Specifically, the front leg includes a fixing plate having a through hole, the rear leg includes a rear leg body having a through hole, and the armrest includes an armrest body having a through hole. The armrest main body, the fixing plate, and the rear leg main body are juxtaposed so that the through holes are arranged side by side. A hinge pin made of a bolt is inserted into these through holes, and a nut is fastened to the tip of the hinge pin. Thereby, the armrest is rotatably supported by the front leg and the rear leg via the hinge pin.

JP 2004-261328 A

  By the way, in the above chair, for example, when the armrest is flipped up with a load applied in the left-right direction, the outer peripheral surface of the hinge pin strongly contacts the inner peripheral surface of the through-hole of the armrest, and the side surface of the nut is the rear leg main body. May come into strong contact with the sides of In this case, the hinge pin receives a force to rotate with the armrest due to friction between the hinge pin and the armrest, while the nut receives a force to keep stationary with the rear leg body due to friction between the nut and the rear leg body. For this reason, the hinge pin and the nut are subjected to a force to rotate relative to each other, resulting in a problem that the hinge pin and the nut are loosened.

  Here, it is conceivable to add a special structure for preventing loosening so that the hinge pin and the nut are not loosened. However, it is not preferable to add a heavy structure or a complicated structure to a chair that requires a light and simple structure, such as a bathroom chair.

  The present invention has been made in view of such a point, and an object of the present invention is a structure that supports an armrest so that the armrest can be pivoted up and down by a lightweight and simple structure in a chair equipped with an armrest that can pivot up and down. It is to prevent the loosening of.

  The chair according to the present invention includes a seat portion on which a user is seated, a leg portion that supports the seat portion, a rod-like portion that extends upward above a side portion of the seat portion in a front view, and the rod-like portion. And an armrest supported so as to be pivotable up and down. The rod-like portion is formed with a hole penetrating in the left-right direction. The armrest has a left side plate portion and a right side plate portion in which holes penetrating in the left-right direction are formed, and is arranged so that the rod-like portion is positioned between the left side plate portion and the right side plate portion. . The chair is further inserted from one of the left side plate portion and the right side plate portion toward the other, and a bolt that penetrates the hole of the left side plate portion, the hole of the rod-like portion, and the hole of the right side plate portion, The rod is tightened to the tip of the bolt and inserted into the hole of at least the rod-shaped portion and the nut contacting the other of the left-side plate portion and the right-side plate portion, and the bolt is inserted into the rod-shaped portion. A collar member interposed between the inner peripheral surface of the hole of the portion and the bolt.

  According to the chair, the nut is in contact with the armrest (specifically, the left side plate or the right side plate). If the inner surface of the hole in the rod-shaped part and the bolt are in direct contact with each other, the nut will receive a force to rotate from the armrest when the armrest is flipped up with a load applied in the left-right direction. On the other hand, the bolt receives a force from the rod-like portion to keep still. For this reason, the bolt and the nut receive a force of relative rotation, and the bolt and the nut may be loosened. However, according to the chair, the collar member is interposed between the inner peripheral surface of the hole of the rod-like portion and the bolt. For this reason, the bolt and the inner peripheral surface of the hole of the rod-shaped portion are not in direct contact with each other. Therefore, even when the armrest is flipped up in a state where a load is applied in the left-right direction, the bolt does not receive a force that tries to remain stationary from the rod-shaped portion. Therefore, since the bolt and the nut do not receive a force that causes relative rotation, loosening between the bolt and the nut can be suppressed. Therefore, according to the chair described above, the lightweight and simple structure in which the collar member is interposed between the inner peripheral surface of the hole of the rod-like portion and the bolt prevents loosening of the structure that rotatably supports the armrest. Can do.

  The collar member is inserted into the hole of the left side plate part, the hole of the bar-like part, and the hole of the right side plate part, and the hole of the left side plate part, the hole of the bar-like part, and the hole of the right side plate part It is preferable to interpose between the inner peripheral surface and the bolt.

  Thereby, even if the position of the collar member is shifted to the left or right, it is possible to suppress the contact between the inner peripheral surface of the hole of the rod-shaped portion and the bolt. Therefore, loosening between the bolt and the nut can be further suppressed.

  The length of the collar member is preferably shorter than the distance between the left end of the hole in the left side plate portion and the right end of the hole in the right side plate portion before the bolt and the nut are tightened.

  Thus, the collar member does not get in the way when tightening the bolt and nut. Therefore, the bolt and the nut can be smoothly tightened.

  The length of the collar member is 0.1 mm to 2 mm shorter than the distance between the left end of the hole in the left side plate part and the right end of the hole in the right side plate part before fastening the bolt and the nut. Is preferred.

  Thus, the collar member does not get in the way when tightening the bolt and nut. Further, after the bolt and nut are tightened, the displacement of the collar member can be suitably suppressed, and the inner peripheral surface of the hole of the rod-shaped portion and the bolt can be sufficiently suppressed. . Therefore, the bolt and the nut can be smoothly tightened, and the loosening between the bolt and the nut after the tightening can be sufficiently suppressed. Moreover, when tightening a bolt and a nut, excessive tightening can be suppressed. Therefore, it is possible to prevent the occurrence of a malfunction such that the armrest is difficult to rotate.

  The left side plate portion, the right side plate portion, and the rod-shaped portion are formed of a metal material, and are arranged in the left-right direction between the left side plate portion and the rod-shaped portion and between the right side plate portion and the rod-shaped portion. It is preferable that a resin cover member in which a hole penetrating is formed is provided, and the collar member is further inserted into the hole of the cover member.

  As a result, since the resin cover member is interposed between the both side plate portions and the rod-shaped portion made of the metal material, it is possible to avoid rubbing the both side plate portions and the rod-shaped portion directly with the rotation of the armrest. Can do. Therefore, it can prevent that a both-sides board part and a rod-shaped part are shaved. Therefore, it is possible to suppress the rattling of the bolt and the nut due to the wear of the both side plate portions and the rod-shaped portion.

  Another chair according to the present invention includes a seat portion on which a user is seated, a leg portion that supports the seat portion, a rod-shaped portion that extends upward above a side portion of the seat portion in a front view, An armrest supported by a rod-like portion so as to be rotatable up and down. The armrest and the rod-shaped portion are respectively formed with holes penetrating in the left-right direction. The armrest is disposed with respect to the rod-shaped portion so that the hole of the armrest and the hole of the rod-shaped portion are aligned. The chair further includes a bolt that passes through the hole in the armrest and the hole in the rod-like portion, a nut that is fastened to a tip portion of the bolt and contacts one of the armrest and the rod-like portion, and at least the armrest and the rod-like shape. A collar member inserted into the other hole of the portion and interposed between the inner peripheral surface of the other hole and the bolt.

  According to the chair, the nut is in contact with one of the armrest and the rod-shaped portion. Assuming that the inner peripheral surface of the other hole and the bolt are in direct contact with each other, when the armrest is flipped up with a load applied in the left-right direction, one of the bolt and nut is removed from the armrest. While receiving the force to rotate, the other receives the force to keep stationary from the rod-like portion. For this reason, the bolt and the nut receive a force of relative rotation, and the bolt and the nut may be loosened. However, according to the chair, the inner peripheral surface of the hole different from the one in contact with the nut among the armrest and the rod-like portion is not directly in contact with the bolt by the collar member. Therefore, even when the armrest is flipped up in a state where a load is applied in the left-right direction, the bolt and the nut do not receive a force that causes relative rotation, so that loosening between the bolt and the nut can be suppressed. Therefore, according to the above-mentioned chair, it is possible to prevent loosening of the structure that supports the armrest rotatably with a light and simple structure.

  The chair may be a bathroom chair used in a bathroom.

  The bathroom chair is used in a narrow bathroom and is often used by elderly people and the like, and thus is required to be small and lightweight. According to the above-mentioned chair, loosening of the structure that rotatably supports the armrest can be prevented by a light and simple structure, and thus it is particularly useful as a bathroom chair.

  The leg portion includes a front leg portion having a front leg body extending obliquely forward and downward, and a rear leg portion having a rear leg body extending obliquely rearward and downward, and the front leg portion and the rear leg portion are parallel to each other. The rod-like part may be integrally formed with the front leg part or the rear leg part.

  Thus, the chair can be folded by rotating the front leg portion and the rear leg portion relative to each other. By the way, the foldable chair has a feature that it can be compactly accommodated by folding. Moreover, it has the feature that it can be easily transported by folding. In a foldable chair provided with an armrest, it is desired that the armrest does not protrude when folded and that the armrest can be pivoted up and down so that it can be easily transported so as not to impair the above-mentioned features. Therefore, the above-mentioned chair that exhibits the above-described effect is particularly useful as a folding chair.

  According to the present invention, in a chair provided with an armrest that can be pivoted up and down, loosening of the structure that supports the armrest so as to pivot up and down can be prevented by a light and simple structure.

It is a front view of the chair which concerns on embodiment. It is a left view of the chair which concerns on embodiment. It is a left view of the state which flipped up the armrest of the chair concerning an embodiment. It is a left view of the state which folded the chair which concerns on embodiment. It is a disassembled perspective view of an armrest structure. It is the VI-VI sectional view taken on the line of FIG. It is the VII-VII sectional view taken on the line of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a chair 1 according to this embodiment, and FIG. 2 is a left side view of the chair 1. The chair 1 according to the present embodiment is a chair that is mainly used when an elderly person, a disabled person, or the like takes a shower in a bathroom, and is a so-called bathroom chair. The chair 1 is a foldable chair that can be folded to be compact when not in use (see FIG. 4). However, the chair according to the present invention is not limited to the bathroom chair 1 and may be a chair used in a place other than the bathroom. The chair according to the present invention is not limited to a foldable chair, and may be a chair that cannot be folded.

  In the following description, front, rear, left, and right refer to front, rear, left, and right as viewed from the person seated on the chair 1. As shown in FIGS. 1 and 2, the chair 1 includes a first frame 10, a pair of left and right second frames 21, a seat portion 30, a backrest 40, and a pair of left and right armrests 50.

  The first frame 10 includes a pair of left and right front leg portions 11, a rod-like portion 12 that extends rearward and upward from the rear end portion of each front leg portion 11, and a connecting portion 13 that connects upper end portions of the left and right rod-like portions 12. It is configured. As shown in FIG. 2, the front leg portion 11 includes a horizontal portion 11a extending in the front-rear direction, an inner pipe portion 11b extending obliquely downward from the front end portion of the horizontal portion 11a, and an outer pipe portion into which the inner pipe portion 11b is inserted. 11c. A rubber leg 5 for preventing slippage is fitted into the lower end portion of the outer pipe portion 11c. Note that the first frame 10 does not necessarily include the horizontal portion 11a. The inner pipe portion 11b and the rod-like portion 12 may be continuous. In the present embodiment, the left and right inner pipe portions 11b, the left and right horizontal portions 11a, the left and right rod-like portions 12, and the connecting portion 13 are integrally formed. However, one or more of them may be formed separately and joined by welding or the like. The material of the 1st flame | frame 10 is not necessarily limited, For example, metals, such as aluminum and stainless steel, or a synthetic resin can be used suitably. Here, the first frame 10 is made of metal.

  The second frame 21 constitutes a rear leg portion. The second frame 21 includes a horizontal portion 21a extending in the front-rear direction, an inner pipe portion 21b extending obliquely downward rearward from the rear end portion of the horizontal portion 21a, and an outer pipe portion 21c into which the inner pipe portion 21b is inserted. ing. However, the second frame 21 does not necessarily have the horizontal portion 21a, and the horizontal portion 21a can be omitted as appropriate. The material of the second frame 21 is not particularly limited, and for example, a metal such as aluminum or stainless steel, or a synthetic resin can be suitably used. In the present embodiment, the second frame 21 is made of metal like the first frame 10. A rubber leg 5 for preventing slipping is fitted into the lower end portion of the outer pipe portion 21c.

  The horizontal portion 11 a of the first frame 10 and the horizontal portion 21 a of the second frame 21 are connected via a horizontal shaft 61. The second frame 21 is attached to the first frame 10 so as to be rotatable around a horizontal axis 61. As shown in FIG. 4, the chair 1 can be folded by rotating the first frame 10 and the second frame 21 around the horizontal axis 61.

  The length of the front leg portion 11 can be adjusted by adjusting the amount of insertion of the inner pipe portion 11b into the outer pipe portion 11c. The length of the second frame 21 as the rear leg can also be adjusted by adjusting the amount of insertion of the inner pipe portion 21b into the outer pipe portion 21c. The inner pipe portion 11b and the outer pipe portion 11c, and the inner pipe portion 21b and the outer pipe portion 21c have substantially the same configuration. Therefore, hereinafter, the configurations of the inner pipe portion 21b and the outer pipe portion 21c will be described, and descriptions of the configurations of the inner pipe portion 11b and the outer pipe portion 11c will be omitted.

  As shown in FIG. 1, the outer pipe portion 21c is formed with a plurality of holes 26 arranged in the vertical direction. On the inner pipe portion 21b, a protrusion 25 having a size similar to that of the hole 26 is formed. The protrusion 25 is biased toward the side of the inner pipe portion 21b by a spring or the like (not shown), but can be buried in the inner pipe portion 21b by pressing from the side. After adjusting the insertion amount of the inner pipe portion 21b with respect to the outer pipe portion 21c and aligning the positions of the protrusion 25 and the desired hole 26, when the pressed protrusion 25 is released, the protrusion 25 fits into the hole 26. Thereby, the inner pipe part 21b can be fixed to the outer pipe part 21c. Thus, by appropriately selecting the hole 26 to be engaged with the protrusion 25, the length of the second frame 21 as the rear leg portion can be adjusted stepwise. Although the description is omitted, the same applies to the front leg portion 11. By changing the length of the front leg part 11 and the rear leg part (that is, the second frame 21), the height of the seat part 30 and the armrest 50 from the floor surface can be adjusted according to the user's physique. it can.

  As shown in FIG. 4, the seat portion 30 is attached to the distal end portion of the horizontal portion 21 a of the second frame 21 via the rotation shaft 62. The seat 30 can be rotated with respect to the second frame 21. A bar 71 and a bar 73 extending in the left-right direction are bridged over the left and right horizontal portions 11 a of the first frame 10. Bars 72 extending from side to side are spanned across the horizontal portions 21 a of the left and right second frames 21. The seat 30 is separated from the bars 71, 72, 73 when the chair 1 is not used (see FIG. 4), but is separated from the bars 71, 72, 73 when used (see FIG. 2). 73. The seat portion 30 is supported by the horizontal portion 11 a of the first frame 10 and the horizontal portion 21 a of the second frame 21 via these bars 71, 72, 73.

  As shown in FIG. 1, the upper ends of the left and right rod-like parts 12 of the first frame 10 are connected via a connecting part 13. The connecting portion 13 is formed in a pipe shape extending in the left-right direction. The backrest 40 is attached to the front portion of the connecting portion 13. However, the connecting portion 13 is not always necessary, and the backrest 40 can be omitted as appropriate.

  As shown in FIG. 1, the rod-like portion 12 extends upward above the side portion of the seat portion 30 in a front view. In the present embodiment, the rod-like portion 12 extends obliquely upward rearward and is inclined from the vertical direction, but the rod-like portion 12 may extend in the vertical direction. Further, the rod-shaped portion 12 may extend obliquely upward in the forward direction. The rod-shaped part 12 may extend straight or may be bent. In this embodiment, the rod-shaped part 12 is formed in a hollow shape. In other words, the rod-shaped part 12 is formed by a pipe. However, the rod-shaped part 12 may be solid. The cross-sectional shape of the rod-shaped portion 12 is not limited to a circular shape, but may be other shapes such as a square shape and a hexagonal shape.

  The armrest 50 is attached to the rod-like portion 12 so as to be rotatable up and down. That is, the armrest 50 is a pivoting type. When the user sits on the chair 1, for example, as shown in FIG. 3, the side of the seat portion 30 can be opened by turning the armrest 50 upward and flipping it up. As a result, the user can easily sit on the seat 30 from the side. After the user is seated on the seat 30, the armrest 50 can be brought into a substantially horizontal posture as shown in FIG. 2 by rotating the armrest 50 in the reverse direction. Thereby, the user can place both hands on the armrest 50 and can sit on the chair 1 stably.

  As described above, the chair 1 according to this embodiment is a foldable chair. As shown in FIG. 4, when the chair 1 is folded, the armrest 50 can be prevented from protruding by flipping up the armrest 50. Therefore, the chair 1 can be stored compactly. Moreover, since it can be made compact, it can be easily carried.

  Next, the armrest 50 and each member that supports the armrest 50 so as to be rotatable up and down will be described. In the following, the entire armrest 50 and each member that supports the armrest 50 so as to be pivotable up and down are referred to as an armrest structure for convenience.

  As shown in FIG. 5, the armrest 50 includes an armrest main body 51 and a support body 52 that supports the armrest main body 51. The base part of the armrest main body 51 branches left and right, and a left side plate 51L and a right side plate 51R that are separated from each other are formed. The left side plate 51L and the right side plate 51R are respectively formed with holes 51a penetrating in the left-right direction.

  The support body 52 includes a left side plate 52L, a right side plate 52R, and a top plate 52B that connects the left side plate 52L and the front end of the right side plate 52R. The left side plate 52L, the right side plate 52R, and the top plate 52B are integrally formed. However, the left side plate 52L, the right side plate 52R, and the top plate 52B may be formed separately from each other. The left side plate 52L and the right side plate 52R are separated from each other to the left and right. The left side plate 52L and the right side plate 52R are respectively formed with holes 52a penetrating in the left-right direction. An erection member 53 made of a rod-like body is bridged between the left side plate 52L and the right side plate 52R. The erection member 53 extends in the left-right direction at a position obliquely below the front of the hole 52a. A step portion 54 is provided at a position behind the erection member 53 of the left side plate 52L and the right side plate 52R.

  The support body 52 is fitted inside the armrest body 51 and is fixed to the armrest body 51. The top plate 52 </ b> B of the support body 52 is fixed to the lower part of the armrest main body 51. The left side plate 52L of the support body 52 is disposed on the right side of the left side plate 51L of the armrest body 51, and the right side plate 52R of the support body 52 is disposed on the left side of the right side plate 51R of the armrest body 51. The left side plate portion of the armrest 50 is formed by the left side plate 51L and the left side plate 52L, and the right side plate portion of the armrest 50 is formed by the right side plate 51R and the right side plate 52R.

  The armrest 50 does not necessarily need to be composed of two members, the armrest main body 51 and the support body 52. The armrest 50 may be configured by combining three or more members. Moreover, the armrest 50 may be comprised by the single member.

  A resin cover member 55 is attached to the rod-shaped portion 12. The cover member 55 includes a left side plate 55L, a right side plate 55R (see FIG. 6), and a central plate 55C that connects the left side plate 55L and the right side plate 55R. The cover member 55 is attached to the rod-shaped portion 12 such that the rod-shaped portion 12 is disposed between the left side plate 55L and the right side plate 55R. The left side plate 55L and the right side plate 55R are respectively formed with holes 55a penetrating in the left-right direction.

  The left side plate 55L and the right side plate 55R are respectively formed with slide grooves 56 in which the erection member 53 of the support body 52 is slidably engaged. When the erection member 53 of the support body 52 slides in the slide groove 56, the rotation of the armrest 50 is guided, and the rotation of the armrest 50 by a predetermined amount or more is restricted.

  The cover member 55 is provided with a stopper 57 that penetrates the left side plate 55L and the right side plate 55R. The stopper 57 protrudes to the left of the left plate 55L and to the right of the right plate 55R. When the armrest 50 is rotated downward from the state of being flipped up, the stepped portion 54 of the support body 52 comes into contact with the stopper 57, and the armrest 50 is maintained at a predetermined position where the armrest 50 assumes a horizontal posture. A load applied by the user to the armrest 50 is supported by the rod-shaped portion 12 via the step portion 54 and the stopper 57 of the support body 52.

  A mounting base 18 having a U-shaped cross section is provided between the rod-shaped portion 12 and the cover member 55. The mounting base 18 is used for stably mounting the cover member 55 and the armrest 50 and is welded to the rod-shaped portion 12. However, the fixing aspect of the mounting base 18 with respect to the rod-shaped part 12 is not necessarily limited. As shown in FIG. 6, the mounting base 18 has a left side plate 18 </ b> L fixed to the left side of the rod-like portion 12 and a right side plate 18 </ b> R fixed to the right side of the rod-like portion 12. Although illustration is omitted, the front end portions of the left side plate 18L and the right side plate 18R are connected by a central plate. The left side plate 18L and the right side plate 18R are respectively formed with holes 18a penetrating in the left-right direction.

  As shown in FIG. 6, the rod-like portion 12 is formed with a hole 12 a penetrating in the left-right direction. The hole 51a of the left side plate 51L of the armrest main body 51, the hole 52a of the left side plate 52L of the support 52, the hole 55a of the left side plate 55L of the cover member 55, the hole 18a of the left side plate 18L of the mounting base 18, and the hole 12a of the rod-like part 12. In the hole 18a of the right side plate 18R of the mounting base 18, the hole 55a of the right side plate 55R of the cover member 55, the hole 52a of the right side plate 52R of the support 52, and the hole 51a of the right side plate 51R of the armrest body 51, 65 is inserted.

  The collar member 65 is formed of a cylindrical member having a smooth inner peripheral surface and outer peripheral surface. However, the shape of the collar member 65 is not particularly limited. In the present embodiment, the collar member 65 is made of stainless steel. However, the material of the collar member 65 is not particularly limited, and may be other metal such as aluminum, or other material such as resin.

  Bolts 66 are inserted into the collar member 65 from left to right. The direction in which the bolt 66 is inserted is not particularly limited, and the bolt 66 may be inserted from the right to the left. Around the hole 51a of the left side plate 51L of the armrest main body 51, a recess 58L recessed to the right is formed. The head portion 66a of the bolt 66 is disposed inside the recess 58L. A washer 76 is interposed between the head 66 a of the bolt 66 and the left side plate 51 </ b> L of the armrest body 51. However, the washer 76 is not necessarily required and can be omitted as appropriate.

  A nut 67 is fastened to the tip of the bolt 66. A recess 58 </ b> R that is recessed to the left is formed around the hole 51 a of the right side plate 51 </ b> R of the armrest body 51. The nut 67 is disposed inside the recess 58R. A washer 77 is interposed between the nut 67 and the right side plate 51 </ b> R of the armrest body 51. However, this washer 77 is not necessarily required and can be omitted as appropriate.

  The shapes and dimensions of the bolts 66 and nuts 67 may be set as appropriate according to the shapes and dimensions of the holes 12a of the rod-like portion 12, the collar member 65, and the like, and are not particularly limited. For example, as the bolt 66, a so-called M6 size (outer diameter is 6 mm) screw or the like can be suitably used. As the nut 67, for example, a U nut (registered trademark) or the like can be suitably used.

  FIG. 6 shows a state before the bolt 66 and the nut 67 are tightened. Here, the length of the collar member 65 is L1. The distance between the left end of the hole 51a of the left side plate 51L of the armrest main body 51 and the right end of the hole 51a of the right side plate 51R of the armrest main body 51 is defined as L2. When the bolt 66 and the nut 67 are tightened, the left side plate 51L and the right side plate 51R of the armrest main body 51 approach each other, and thus the distance L2 is shortened. However, if the length L1 of the collar member 65 is too long, the head portion 66a and the nut 67 of the bolt 66 come into contact with the end surface of the collar member 65 via the washer 76 and the washer 77, and the bolt 66 and the nut 67 May be hindered. In other words, the collar member 65 may be in the way, and the bolt 66 and the nut 67 may not be sufficiently tightened.

  Therefore, in this embodiment, the length L1 of the collar member 65 is the distance L2 before the bolt 66 and the nut 67 are tightened, that is, the left end of the hole 51a of the left side plate 51L of the armrest body 51 and the hole 51a of the right side plate 51R. Is set to be shorter than the distance L2 from the right end of the. This prevents the collar member 65 from interfering when the bolt 66 and the nut 67 are tightened. The length L1 of the collar member 65 may be shorter than or equal to the distance L2 after the bolt 66 and the nut 67 are tightened. Although the specific numerical value of the length L1 of the collar member 65 is not particularly limited, for example, it is preferably about 0.1 mm to 2 mm shorter than the distance L2 before the bolt 66 and the nut 67 are tightened. In the present embodiment, the length L1 is 1 mm shorter than the distance L2. As a result, the bolt 66 and the nut 67 can be tightened satisfactorily, and the collar member 65 can be prevented from rattling from side to side after tightening.

  The above is the configuration of the armrest structure. Next, the behavior of the bolt 66 and the nut 67 when the armrest 50 rotates will be described. As shown in FIG. 6, the head portion 66 a of the bolt 66 is in contact with the left side plate 51 </ b> L of the armrest body 51 via the washer 76. The nut 67 is in contact with the right side plate 51 </ b> R of the armrest body 51 via a washer 77. Therefore, when the armrest 50 is rotated, the bolt 66 and the nut 67 receive a frictional force from the armrest body 51 and receive a force to rotate together with the armrest 50. Here, the bolt 66 is rotatable with respect to the collar member 65. Therefore, the bolt 66 rotates inside the collar member 65 as the armrest 50 rotates.

  By the way, unlike the armrest 50, the rod-shaped part 12, the mounting base 18, and the cover member 55 remain stationary. However, since the collar member 65 is disposed around the bolt 66, the contact between the inner peripheral surface of the hole 12 a of the rod-shaped portion 12 and the bolt 66, and the inner peripheral surface of the hole 18 a of the mounting base 18 and the bolt 66. Contact and contact between the inner peripheral surface of the hole 55a of the cover member 55 and the bolt 66 are prevented. Therefore, there is no friction between the bolts 66 and the inner peripheral surfaces of the holes 12a, 18a, and 55a, and the bolts 66 are stationary from the rod-shaped portion 12, the mounting base 18, and the cover member 55. There is no power to continue. Therefore, even when the armrest 50 is rotated in a state where a load is applied to the armrest 50 in the left-right direction, the bolt 66 and the nut 67 do not receive forces in opposite directions. Looseness with 67 can be suppressed.

  As described above, according to the chair 1 according to the present embodiment, even when the armrest 50 is rotated in a state where a load in the left-right direction is applied to the armrest 50, the bolt 66 and the nut 67 are reversely moved. Therefore, the looseness between the bolt 66 and the nut 67 can be suppressed. Therefore, rattling of the armrest 50 can be prevented in advance. According to the chair 1 according to the present embodiment, the above effect can be obtained by interposing the collar member 65 between the inner peripheral surface of the hole 12a of the rod-like portion 12 and the bolt 66. That is, it is possible to suppress loosening of the bolt 66 and the nut 67 by adding a lightweight and simple structure called the collar member 65.

  Note that the collar member 65 has a hole on the stationary member when the armrest 50 is rotated (in this embodiment, the hole 12a of the rod-like portion 12, the hole 18a of the mounting base 18, and the hole 55a of the cover member 55). ) And the bolt 66, and the inner circumference of the hole of the rotating member (in this embodiment, the hole 51a of the armrest body 51 and the hole 52a of the support body 52). It is not always necessary to be interposed between the surface and the bolt 66. Therefore, the collar member 65 can be formed short. However, according to the present embodiment, the collar member 65 includes the holes 51 a of the armrest body 51, the holes 52 a of the support 52, the holes 55 a of the cover member 55, the holes 18 a of the mounting base 18, and the holes 12 a of the rod-shaped portion 12. It is formed so as to be interposed between the peripheral surface and the bolt 66. Therefore, even if the position of the collar member 65 is shifted to the left or right, the contact between the bolts 66 and the inner peripheral surface of the hole 12a of the rod-shaped portion 12, the hole 18a of the mounting base 18, and the hole 55a of the cover member 55 is achieved. Can be reliably prevented. Therefore, loosening between the bolt 66 and the nut 67 can be further suppressed.

  According to this embodiment, the left side plate 55L of the resin cover member 55 is interposed between the left side plate 52L of the support body 52 made of a metal material and the left side plate 18L of the mounting base 18. Similarly, the right side plate 55R of the resin cover member 55 is interposed between the right side plate 52R of the support 52 made of a metal material and the right side plate 18R of the mounting base 18. Therefore, wear between the left side plate 52L and the left side plate 18L and wear between the right side plate 52R and the right side plate 18R can be prevented. Therefore, rattling of the bolt 66 and the nut 67 due to the wear can be suppressed.

  As described above, according to the present embodiment, the looseness between the bolt 66 and the nut 67 can be suppressed only by adding a lightweight and simple structure called the collar member 65. The chair 1 for a bathroom is used in a narrow bathroom and is often used by an elderly person or the like, and thus is required to be small and lightweight. Therefore, the chair 1 according to the present embodiment is particularly useful as a bathroom chair.

  The chair 1 according to the present embodiment is a foldable chair. The foldable chair can be compactly accommodated by folding, and has the feature of being easily transported. In the foldable chair 1 provided with the armrest 50, the armrest 50 can be rotated with folding so that the armrest 50 does not protrude when folded and is easily transported so as not to impair the above-mentioned features. Many. According to the chair 1 according to the present embodiment, even if the armrest 50 is frequently rotated, the bolt 66 and the nut 67 are not easily loosened. Therefore, the chair 1 according to the present embodiment is particularly useful as a folding chair.

  The chair according to the present invention is not limited to the chair 1 of the above embodiment, and can be implemented in various other forms. Next, a modified example of the chair 1 will be briefly described.

  In the embodiment, the collar member 65 is formed so as not to rotate when the armrest 60 rotates. However, it is sufficient for the collar member 65 to prevent contact between the inner peripheral surface such as the hole 12a of the rod-like portion 12 and the bolt 66, and whether the collar member 65 itself rotates is not particularly limited. The collar member 65 may rotate as the armrest 60 rotates.

  When the bolt 66 rotates inside the collar member 65 as in the above-described embodiment, the outer contour shape of the collar member 65 may not be circular. The collar member 65 only needs to have a shape corresponding to the hole 12a or the like of the rod-like portion 12, and may be, for example, an octagonal shape.

  The collar member 65 only needs to prevent contact between the inner peripheral surface of the rod-shaped portion 12 such as the hole 12a and the bolt 66, and is not in contact with the inner peripheral surface of the rod-shaped portion 12 such as the hole 12a (for example, the rod-shaped portion in FIG. A notch or the like may be formed in a portion between the left and right holes 12a of the portion 12. In addition, a slit or the like may be formed over almost the entire length of the collar member 65 as long as contact between the inner peripheral surface such as the hole 12a of the rod-shaped portion 12 and the bolt 66 can be prevented.

  The collar member 65 does not necessarily have to be a single member, and may be configured by combining a plurality of members. For example, the collar member 65 may be configured by arranging a plurality of ring-shaped members in the axial direction.

  In the embodiment, the nut 67 is in contact with the rotating member (armrest 50), and the collar member 65 is in contact with the inner peripheral surface of the hole (such as the hole 12a of the rod-shaped portion 12) of the stationary member. It was interposed between the bolts 66. However, the structure of the armrest 50 and the rod-shaped portion 12 is changed, the nut 67 is brought into contact with the stationary member, and the collar member 65 is interposed between the inner peripheral surface of the hole of the rotating member and the bolt 66. You may do it. The collar member 65 may be any member that suppresses the application of a relative rotating force to the bolt 66 and the nut 67 when the armrest 50 is rotated, and the member that contacts the nut 67 is a member on the rotating side. It may be a stationary member.

  In the above-described embodiment, the rod-shaped portion 12 is continuous with the front leg portion 11, but the rod-shaped portion 12 may be continuous with the rear leg portion (that is, the second frame 21). Moreover, the rod-shaped part 12 may be independent from the front leg part 11 and the rear leg part.

  In the embodiment, the leg portion is composed of two front leg portions 11 and two rear leg portions. However, the number of legs is not particularly limited. Moreover, the structure of a leg part is not necessarily limited at all. The leg is not limited to a leg whose length can be adjusted, and may be a leg that cannot be adjusted in length.

  As described above, the chair according to the present invention is particularly useful as a bathroom chair and a folding chair, but is not necessarily limited to a bathroom chair or a folding chair.

1 Chair 11 Front leg (leg)
12 Rod-shaped part 12a Hole in rod-shaped part 20 Second frame (leg part)
30 Seat 50 Armrest 51 Armrest body 51L Left side plate of the armrest body (Left side plate)
51R Right side plate (right side plate) of armrest body
52 Support 52L Left side plate (left side plate) of support
52R right side plate of support (right side plate)
65 Collar member 66 Bolt 67 Nut

Claims (8)

A seat portion on which a user is seated, a leg portion that supports the seat portion, a rod-like portion that extends upward above the side portion of the seat portion in a front view, and a vertically-supporting support on the rod-like portion. A chair provided with an armrest,
The rod-shaped part is formed with a hole penetrating in the left-right direction,
The armrest has a left side plate portion and a right side plate portion each formed with a hole penetrating in the left-right direction, and is arranged such that the rod-like portion is positioned between the left side plate portion and the right side plate portion,
A bolt inserted from one of the left side plate portion and the right side plate portion toward the other, and penetrating the hole of the left side plate portion, the hole of the rod-like portion, and the hole of the right side plate portion;
A nut that is fastened to the tip of the bolt and contacts the other of the left side plate and the right side plate,
A chair provided with at least a collar member interposed between the bolt and the inner peripheral surface of the hole of the rod-like part by being inserted into at least the hole of the rod-like part and inserting the bolt therein.   The collar member is inserted into the hole of the left side plate part, the hole of the bar-like part, and the hole of the right side plate part, and the hole of the left side plate part, the hole of the bar-like part, and the hole of the right side plate part The chair according to claim 1, wherein the chair is interposed between an inner peripheral surface and the bolt.   The length of the collar member is shorter than a distance between a left end of the hole of the left side plate portion and a right end of the hole of the right side plate portion before the bolt and the nut are tightened. The listed chair.   The length of the collar member is 0.1 mm to 2 mm shorter than the distance between the left end of the hole in the left side plate part and the right end of the hole in the right side plate part before tightening the bolt and the nut. The chair according to claim 3. The left side plate portion, the right side plate portion, and the rod-like portion are formed of a metal material,
Between the left side plate portion and the rod-like portion, and between the right side plate portion and the rod-like portion, a resin cover member having a hole penetrating in the left-right direction is provided,
The chair according to any one of claims 1 to 4, wherein the collar member is further inserted into a hole of the cover member. A seat portion on which a user is seated, a leg portion that supports the seat portion, a rod-like portion that extends upward above the side portion of the seat portion in a front view, and a vertically-supporting support on the rod-like portion. A chair provided with an armrest,
The armrest and the rod-shaped portion are each formed with a hole penetrating in the left-right direction,
The armrest is disposed with respect to the rod-shaped portion so that the hole of the armrest and the hole of the rod-shaped portion are aligned.
A bolt that penetrates the hole of the armrest and the hole of the rod-shaped part;
A nut that is clamped to the tip of the bolt and contacts one of the armrest and the bar;
A chair provided with at least a collar member that is inserted into the other hole of the armrest and the rod-like portion and interposed between the inner peripheral surface of the other hole and the bolt.   The chair according to claim 1, wherein the chair is a bathroom chair used in a bathroom. The leg portion has a front leg portion having a front leg body extending obliquely downward and forward, and a rear leg portion having a rear leg body extending obliquely downward and backward.
The front leg portion and the rear leg portion are coupled to each other so as to be rotatable around a horizontal axis,
The chair according to any one of claims 1 to 7, wherein the bar-shaped part is formed integrally with the front leg part or the rear leg part.

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