JP2013017636A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair with an armrest rotatable up and down, which is light-weight and simple in structure, allows the armrest to smoothly rotate, and prevents the armrest from falling down from a vertical position.SOLUTION: The chair includes the armrest 50 having a rod-like building member 53 outlying right and left, a supporting member 55 on which a slide groove 56 to guide the movement of the rod-like building member 53 is formed, and an elastic piece 80 that is elastically deformable. The elastic piece 80 holds the rod-like building member 53 with an upper end 82a when the armrest 50 is on the vertical position. The elastic piece 80 is composed so that the rod-like building member 53 could slide on a central part 82b with energized by the central part 82b when the armrest 50 is between a horizontal position and the vertical position.

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 or the like used by elderly people in a bathroom, a chair having an armrest that can be turned 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 having an armrest that can be pivoted up and down, by turning the armrest when folded, the armrest can be prevented from protruding 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. Hinge pins are inserted through these through holes. Thereby, the armrest main body is rotatably supported by the fixing plate of the front leg and the rear leg main body via the hinge pin.

  The rear leg main body is provided with a stopper pin protruding sideways. An arcuate guide groove with which the stopper pin is slidably engaged is formed on the inner surface side of the armrest body. The movement range of the stopper pin is regulated by the guide groove, and as a result, the rotation range of the armrest is regulated. That is, when the stopper pin is located at one end of the guide groove, the armrest is in a substantially horizontal position (hereinafter referred to as a horizontal position), and when the stopper pin is located at the other end of the guide groove, the armrest is in a substantially vertical position ( Hereinafter, the rotation range of the armrest is restricted between the horizontal position and the vertical position.

  A protrusion for holding the stopper pin in a horizontal position is provided on one end side of the guide groove. When the stopper pin gets over the protrusion and moves to one end of the guide groove, the protrusion restricts the movement of the stopper pin in the reverse direction, and the armrest is held in the horizontal position. A protrusion for holding the stopper pin in a vertical position is provided on the other end side of the guide groove. When the stopper pin gets over the protrusion and moves to the other end of the guide groove, the protrusion restricts the movement of the stopper pin in the reverse direction, and the armrest is held in the vertical position.

JP 2004-261328 A

  However, in the above-mentioned chair, if the mounting position of the armrest main body varies or the accuracy of molding the rear leg main body is poor, the relative position between the guide groove and the stopper pin is likely to shift. In that case, the stopper pin may not be held by the protrusion at an appropriate position. As a result, for example, the armrest may fall naturally from the vertical position. Moreover, there was a possibility that the armrest could not be smoothly rotated between the vertical position and the horizontal position.

  Here, in order to prevent the armrest from falling down naturally, it is conceivable to add a special structure for preventing tilting. Further, in order to ensure smooth rotation of the armrest, it is conceivable to add another special structure. 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 the above points, and an object of the present invention is to enable smooth rotation of an armrest by a lightweight and simple structure in a chair having an armrest that can be rotated up and down. At the same time, it is to prevent the armrest from falling naturally from the vertical position.

  A 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 a left-right direction. It is a chair provided with the armrest supported by the said rod-shaped part so that rotation up and down was possible via the extending shaft member. The armrest includes a left side plate portion and a right side plate portion that are spaced apart from each other in the left-right direction, and a rod-like erection member that spans between the left side plate portion and the right side plate portion. The chair further includes an elastic piece. The elastic piece is fixed to the rod-shaped portion, and has an upper end portion, a central portion located below the upper end portion via a step portion, and a lower end portion continuous below the central portion, and the upper end And at least one of the lower end and the lower end is cantilever-supported without being fixed to the rod-shaped portion. When the armrest is in a vertical position where the armrest is in a substantially vertical position, the elastic member holds the erection member by the upper end portion, and between the horizontal position and the vertical position where the armrest assumes a substantially horizontal position. In some cases, the construction member is configured to slide on the central portion while being urged by the central portion.

  According to the chair, when the armrest is rotated to the vertical position, the erection member rides on the step portion of the elastic piece and is held by the upper end portion of the elastic piece. Therefore, the downward movement of the erection member is restricted by the stepped portion. Therefore, it can prevent that an armrest falls down naturally. When the armrest rotates between the vertical position and the horizontal position, the erection member slides on the central portion while receiving a biasing force from the central portion of the elastic piece. At this time, since the elastic piece is elastically deformable, the armrest is smoothly rotated. On the other hand, since the construction member receives a certain amount of resistance from the central portion of the elastic piece, the construction member is prevented from suddenly moving downward when the armrest is moved from the vertical position to the horizontal position. Therefore, when the armrest is rotated from the vertical position to the horizontal position, it is possible to prevent the armrest from falling abruptly. According to the chair, the lightweight and simple structure enables the armrest to rotate smoothly, and prevents the armrest from falling down naturally from the vertical position.

  The elastic piece may be disposed in front of the rod-shaped part, and the central part of the elastic piece may be formed in a curved shape so as to protrude forward.

  This makes it possible to simply configure an elastic piece that exhibits the above-described effects. Further, the movement of the erection member can be made smoother, and consequently the rotation of the armrest can be further smoothed.

  The upper end portion of the elastic piece may include an inclined surface portion that is inclined rearward and obliquely downward.

  Thus, when the armrest is moved to the vertical position, the erection member can be firmly held on the upper end portion of the elastic piece. In addition, since the upper end portion is inclined rearward and obliquely downward, it is suppressed that the erection member rides on the step portion and moves to the center portion side. Therefore, it can suppress further that an armrest falls naturally from a vertical position.

  The end portion of the elastic piece that is cantilevered may be separated from the rod-shaped portion and the support member.

  Thus, the elastic piece is easily elastically deformed, and the operation of the erection member riding on the step portion of the elastic piece and the operation of getting on and off the step portion can be further smoothed. Therefore, when the armrest is rotated from the vertical position to the horizontal position, or when the armrest is rotated from the horizontal position to the vertical position, it is possible to prevent an undue stress from being applied to the installation member and the support member. Therefore, the armrest can be rotated smoothly, and damage to the elastic piece or the like can be prevented.

  The chair may further include a left side plate and a right side plate each having a substantially arc-shaped slide groove that engages with the installation member, and may include a support member fixed to the rod-shaped portion. The elastic piece is fixed to the rod-shaped portion between the left side plate and the right side plate of the support member. When the armrest is between the horizontal position and the vertical position, the central portion of the elastic piece is installed between the edge portion of the slide groove of the left side plate and the right side plate and the central portion. The erection member may be urged so as to sandwich the member.

  Thus, when the armrest rotates between the vertical position and the horizontal position, the erection member receives a biasing force from the central portion of the elastic piece, and the edges of the slide grooves of the left side plate and the right side plate of the support member It moves in the slide groove while being sandwiched between the portion and the central portion of the elastic piece. The movement of the erection member is guided by the slide groove, and the elastic piece can be elastically deformed, so that the armrest can be smoothly rotated. On the other hand, since the erection member is sandwiched between the edge of the slide groove and the central part of the elastic piece, the erection member is prevented from suddenly moving downward when the armrest is moved from the vertical position to the horizontal position. The Therefore, when the armrest is rotated from the vertical position to the horizontal position, it is possible to prevent the armrest from falling abruptly.

  The chair includes a left side plate disposed between the bar-shaped portion and the left side plate of the support member, and a right side plate disposed between the bar-shaped portion and the right side plate of the support member, A mounting base fixed to the rod-shaped portion may be provided, and the outer surface of the left side plate and the right side plate of the mounting base may be formed as a flat surface.

  This makes it difficult for the armrest to tilt left and right even when a load in the left-right direction is applied to the armrest. Therefore, the armrest can be rotated stably.

  The mounting base includes a central plate that is spaced apart from the rod-shaped portion and connects the left side plate and the right side plate of the mounting base, and the elastic piece includes a flat plate portion that extends from an end portion that is not cantilevered. And the flat plate portion may be fixed to the rod-shaped portion by being inserted between the central plate and the rod-shaped portion.

  By this, an elastic piece can be easily attached with respect to a rod-shaped part by inserting a flat plate part between the center board of a mounting base, and a rod-shaped part. Therefore, the elastic piece having the above-described effects can be installed with a simple configuration.

  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, the armrest can be smoothly rotated by a light and simple structure, and the armrest can be prevented from falling down naturally from the vertical position, so that it is particularly useful as a bathroom chair.

  According to the present invention, in a chair equipped with an armrest that can be pivoted up and down, the armrest can be smoothly pivoted by a light and simple structure, and the armrest can be prevented from falling down naturally from a vertical position. can do.

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 a perspective view of a rod-shaped part and a mounting base. It is a perspective view of a rod-shaped part, a mounting base, and an elastic piece. It is the VIII-VIII sectional view taken on the line of FIG. FIG. 9 is a view corresponding to FIG. 8 in a state where the armrest is moved to the vertical position. FIG. 3 is a sectional view taken along line XX in FIG. 2. It is a side view of the elastic piece which concerns on a modification. It is a side view of the elastic piece which concerns on another modification. It is a side view of the elastic piece which concerns on another modification. It is a side view of the elastic piece which concerns on another modification.

  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. That is, the side of the seat 30 can be opened by moving the armrest 50 to the vertical position. 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 returned to a substantially horizontal position as shown in FIG. 2 by rotating the armrest 50 in the reverse direction. In this way, by moving the armrest 50 to the horizontal position, 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.

  Although details will be described later, a mounting base 18 (see FIG. 6) is fixed to the rod-shaped portion 12, and a resin support member 55 is attached around the mounting base 18. The support member 55 is a member that supports the armrest 50, and is fixed to the rod-shaped portion 12 via the mounting base 18. The support member 55 includes a left side plate 55L, a right side plate 55R (see FIG. 10), and a central plate 55C that connects the left side plate 55L and the right side plate 55R. The support 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 installation member 53 of the armrest 50 is slidably engaged. When the erection member 53 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 support 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 eventually comes into contact with the stopper 57, and the armrest 50 is maintained in the horizontal position. 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.

  Next, the internal configuration of the support member 55 will be described. As shown in FIG. 6, the rod-shaped portion 12 is provided with a mounting base 18 having a U-shaped cross section. The mounting base 18 is a member for stably mounting the support member 55, and by extension, for mounting the armrest 50 stably. The mounting base 18 is welded to the rod-shaped part 12. However, the fixing aspect of the mounting base 18 with respect to the rod-shaped part 12 is not necessarily limited. The mounting base 18 is bridged between the left side plate 18L fixed to the left side of the rod-like portion 12, the right side plate 18R fixed to the right side of the rod-like portion 12, and the front end portions of the left side plate 18L and the right side plate 18R. And a central plate 18C. 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. 7, an elastic piece 80 is disposed in front of the rod-shaped portion 12. The elastic piece 80 is engaged with the erection member 53 of the armrest 80 to hold the armrest 50 in the vertical position, and the armrest 50 does not fall suddenly when the armrest 50 moves from the vertical position to the horizontal position. And play a role. Next, a detailed configuration of the elastic piece 80 will be described.

  The elastic piece 80 is formed by appropriately bending and bending a thin metal plate. The elastic piece 80 is elastically deformable and has a function as a so-called leaf spring. As shown in FIG. 8, the elastic piece 80 includes a flat plate portion 81 inserted into a gap between the rod-shaped portion 12 and the mounting base 18 (specifically, a central plate 18 </ b> C of the mounting base 18), and a front side of the flat plate portion 81. And a spring portion 82 located at the same position. In this embodiment, the vertical length of the flat plate portion 81 is longer than the vertical length of the central plate 18C of the mounting base 18, and the lower end portion 81c of the flat plate portion 81 protrudes downward from the lower end of the central plate 18C. However, the vertical length of the flat plate portion 81 is not particularly limited, and the lower end portion 81c of the flat plate portion 81 may not protrude from the lower end of the center plate 18C.

  The spring portion 82 has an upper end portion 82a extending forward from the upper end of the flat plate portion 81, a central portion 82b curved convexly toward the front, and a lower end portion 82c continuous downward from the central portion 82b. . The upper end portion 82a is an inclined surface portion that is inclined rearward and obliquely downward. A stepped portion 82ab is formed at the boundary between the central portion 82b and the upper end portion 82a. However, the upper end portion 82a may not be an inclined surface portion, and may be, for example, a horizontal surface portion having a horizontal surface. The shape of the stepped portion 82ab is not particularly limited, and as will be described later, it is sufficient if the stepped portion is such that the erection member 53 can ride when the armrest 50 reaches the vertical position, and the specific shape thereof is particularly limited. Not a translation. The shape of the lower end portion 82c is not particularly limited, but in the present embodiment, the lower end portion 82c is curved in a convex shape toward the rear.

  Since the upper end portion 82 a is connected to the flat plate portion 81, it is fixed to the rod-shaped portion 12. On the other hand, the lower end portion 82c is not fixed to the rod-shaped portion 12, but is cantilevered. In the present embodiment, the lower end portion 82 c is separated from the central plate 18 </ b> C of the mounting base 18. That is, the lower end portion 82c is not in contact with the central plate 18C of the mounting base 18, and a gap is formed between the lower end portion 82c and the central plate 18C. However, the aspect of the lower end portion 82c is not particularly limited, and the lower end portion 82c may be in contact with the center plate 18C.

  As shown in FIG. 8, a part of the upper end portion 82a, the stepped portion 82ab, the central portion 82b, and the lower end portion 82c of the spring portion 82 are located inside the slide groove 56 in a side view. Although not particularly limited, in the present embodiment, the distance between the spring portion 82 and the front edge portion 56f of the slide groove 56 becomes narrower toward the upper side. A gap larger than the diameter of the erection member 53 is provided between the lower end portion 82 c and the edge portion 56 f of the slide groove 56. On the other hand, the distance between the central portion 82 b and the edge portion 56 f of the slide groove 56 is smaller than the diameter of the erection member 53. The central part 82b of the spring part 82 urges the erection member 53 forward by its own elastic force. Therefore, when the erection member 53 is positioned in front of the center portion 82 b, the erection member 53 is sandwiched between the center portion 82 b and the edge portion 56 f of the slide groove 56.

  FIG. 9 shows the positional relationship between the erection member 53 and the elastic piece 80 when the armrest 50 is in the vertical position. As shown in FIG. 9, when the armrest 50 is rotated to the vertical position, the erection member 53 rides on the upper end 82a from the central part 82b of the spring part 82 over the step part 82ab. As a result, the erection member 53 is held by the upper end portion 82a. Thereby, unless the downward intentional force is applied to the armrest 50, the erection member 53 is regulated so as not to move to the center portion 82b side.

  The armrest 50 is supported by the rod-like portion 12 via a bolt 66 so as to be rotatable up and down. The bolt 66 is an example of a shaft member according to the present invention. Next, a fastening mode of the bolt 66 and the like will be described.

  As shown in FIG. 10, a hole 12 a penetrating in the left-right direction is formed in the rod-like portion 12. The hole 51a of the left side plate 51L of the armrest body 51, the hole 52a of the left side plate 52L of the support body 52, the hole 55a of the left side plate 55L of the support member 55, the hole 18a of the left side plate 18L of the mounting base 18, and the hole 12a of the rod-shaped 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 support member 55, the hole 52a of the right side plate 52R of the support body 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. 10 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 erection member 53 and the elastic piece 80 when the armrest 50 rotates will be described.

  As shown in FIG. 8, when the armrest 50 is in the horizontal position, the erection member 53 is in contact with the lower end portion 82 c of the elastic piece 80. Since the lower end portion 82c is curved in the direction opposite to the central portion 82b, the upward movement of the erection member 53 is restricted to some extent. Therefore, rattling of the armrest 50 in the horizontal position is prevented.

  On the other hand, a gap larger than the diameter of the erection member 53 is provided between the lower end portion 82 c and the front edge portion 56 f of the slide groove 56. Therefore, when the user applies an upward turning force to the armrest 50, the erection member 53 easily moves from the lower end portion 82c to the central portion 82b. Further, since the elastic piece 80 can be elastically deformed, the central portion 82b receives a backward force from the erection member 53 and elastically deforms as the erection member 53 moves upward. As a result, a sufficient gap is formed between the center portion 82b and the edge portion 56f of the slide groove 56, and the erection member 53 moves smoothly. Therefore, the user can easily turn the armrest 50 upward.

  When the erection member 53 moves further upward, the erection member 53 eventually runs from the central part 82b to the upper end part 82a via the step part 82ab. Note that the central portion 82b is convexly curved forward, and the elastic piece 80 is elastically deformable, so that the construction member 53 can be moved onto the upper end portion 82a without applying a great force. be able to. As a result, as shown in FIG. 9, the erection member 53 is held by the upper end portion 82a. Therefore, the user can easily hold the armrest 50 in the vertical position.

  Since the step portion 82ab is provided between the center portion 82b and the upper end portion 82a, the erection member 53 can be moved to the center portion 82b side beyond the step portion 82ab only by receiving the force of the weight of the armrest 50. Never move. Particularly in the present embodiment, the distance between the central portion 82 b and the front edge portion 56 f of the slide groove 56 is smaller than the diameter of the erection member 53. The upper end portion 82a of the elastic piece 80 is inclined obliquely downward and backward. Therefore, the armrest 50 will not fall down naturally unless an intentional force to rotate the armrest 50 downward is applied. Therefore, it is possible to reliably prevent the armrest 50 from falling naturally from the vertical position.

  On the other hand, when returning the armrest 50 from the vertical position to the horizontal position, the construction member 53 is moved from the upper end portion 82a to the central portion 82b by applying a certain amount of force to the armrest 50 to some extent. At this time, the erection member 53 is urged forward by the central portion 82b. The erection member 53 slides on the central portion 82b while receiving a biasing force from the central portion 82b. Therefore, it is possible to prevent the erection member 53 from moving suddenly downward due to the weight of the armrest 50 during the rotation. In the present embodiment, the erection member 53 is sandwiched between the central portion 82 b and the edge portion 56 f of the slide groove 56. This also prevents the erection member 53 from moving suddenly downward due to the weight of the armrest 50 during the rotation. Therefore, it is possible to prevent the armrest 50 from falling suddenly during the rotation. The erection member 53 that has moved downward eventually reaches the lower end 82c from the central portion 82b. As a result, the armrest 50 is positioned in the horizontal position.

  In the chair 1 according to the present embodiment, the looseness between the bolt 66 and the nut 67 is suppressed by the collar member 65 described above. Next, the behavior of the bolt 66 and the nut 67 when the armrest 50 rotates will be described. As shown in FIG. 10, 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 support 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 support 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 support 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, when the armrest 50 is moved to the vertical position, the erection member 53 gets over the step portion 82ab of the elastic piece 80 and is held by the upper end portion 82a. Therefore, it can prevent that the armrest 50 falls down naturally. Further, when the armrest 50 is rotated from the vertical position toward the horizontal position, the erection member 53 slides on the elastic piece 80 (specifically, on the central portion 82b) while receiving the elastic force of the elastic piece 80. Further, the erection member 53 slides on the central portion 82 b while being sandwiched between the central portion 82 b of the elastic piece 80 and the edge portion 56 f of the slide groove 56. Therefore, the erection member 53 is prevented from moving suddenly downward during the movement. Therefore, it is possible to prevent the armrest 50 from suddenly falling over during rotation. According to the chair 1 according to the present embodiment, the armrest 50 can be smoothly rotated with a light and simple structure, and the armrest 50 can be prevented from falling naturally from the vertical position.

  According to this embodiment, the center part 82b of the elastic piece 80 is formed in the curved shape which protrudes ahead. Therefore, the above-described effects can be obtained with a simple configuration. Further, when the armrest 50 is rotated, the erection member 53 can be moved more smoothly.

  Moreover, in this embodiment, the upper end part 82a of the elastic piece 80 consists of an inclined surface part inclined backward and downward. Thus, the erection member 53 can be firmly held on the upper end portion 82a of the elastic piece 80, and the armrest 50 can be further prevented from falling naturally from the vertical position.

  In the present embodiment, the lower end portion 82 c of the elastic piece 80 is cantilevered, and the lower end portion 82 c is spaced forward from the rod-shaped portion 12 and the mounting base 18. With such a configuration, the elastic piece 80 is preferably easily elastically deformed, and the operation of the erection member 53 riding on the step portion 82ab of the elastic piece 80 and the operation of getting on and off from the step portion can be further smoothed. Therefore, when the armrest 50 is rotated from the vertical position to the horizontal position, or when the armrest 50 is rotated from the horizontal position to the vertical position, it is possible to prevent the laying member 53 and the elastic piece 80 from being subjected to excessive stress. Therefore, the armrest 50 can be rotated more smoothly. Further, it is possible to prevent the elastic piece 80 and the like from being damaged.

  In the present embodiment, the outer surfaces of the left side plate 18L and the right side plate 18R of the mounting base 18 are formed as flat surfaces. Thus, even when a load in the left-right direction is applied to the armrest 50, the support member 55 can be stably supported by the mounting base 18, and as a result, the armrest 50 can be stably supported by the mounting base 18. . According to the present embodiment, the mounting base 18 can sufficiently suppress the armrest 50 from tilting left and right. Therefore, the armrest 50 can be stably rotated.

  In the present embodiment, the elastic piece 80 is fixed to the rod-shaped portion 12 by inserting the flat plate portion 81 between the rod-shaped portion 12 and the central plate 18 </ b> C of the mounting base 18. According to this embodiment, the elastic piece 80 can be easily attached.

  As described above, according to the present embodiment, the above-described effects can be obtained by a lightweight and simple structure called the elastic piece 80. 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.

  In addition, according to the chair 1 according to the present embodiment, even when the armrest 50 is rotated in a state in which a load in the left-right direction is applied to the armrest 50, the reverse rotational force is applied to the bolt 66 and the nut 67. 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.

  According to this embodiment, the left side plate 55L of the resin support 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 support member 55 is interposed between the right side plate 52R of the support body 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 according to the present embodiment is particularly useful as a bathroom chair for which weight reduction and the like are strongly demanded.

  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, the armrest 50 can be smoothly rotated, while the armrest 50 can be prevented from falling down naturally. Moreover, 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.

  In addition, the chair which concerns on this invention is not restricted to the chair 1 of the said embodiment, It can implement with a various form other than that. Next, a modified example of the chair 1 will be briefly described.

  In the embodiment, the lower end portion 82c of the elastic piece 80 is cantilevered, but the upper end portion 82a of the elastic piece 80 may be cantilevered as shown in FIG. Moreover, the upper end part 82a may be curving convexly toward back.

  As shown in FIG. 12, both the upper end part 82a and the lower end part 82c of the elastic piece 80 may be cantilevered. In the modification shown in FIG. 12, the central portion 82b has a curved portion 82b1 and a curved portion 82b3 that protrude forward, respectively, and a vertical portion 82b2 positioned between the curved portion 82b1 and the curved portion 82b3. . The step portion 82ab may be provided only on the upper side, but the elastic piece 80 may include a plurality of step portions.

  As shown in FIG. 13, the upper end portion 82a of the elastic piece 80 may be inclined rearward and obliquely upward. The center part 82b may be comprised from the perpendicular part 82b1 extended in a perpendicular direction, and the inclination part 82b2 extended in back diagonally downward from the lower end of the vertical part 82b1. Thus, the center part 82b may be non-curved.

  In the said embodiment, the lower end part 82c of the elastic piece 80 was spaced apart ahead from the center board 18C of the mounting base 18 (refer FIG. 8). However, as shown in FIG. 14, the lower end portion 82 c may extend rearward to the same extent as the flat plate portion 81 and come into contact with the central plate 18 </ b> C of the mounting base 18.

  In the embodiment, the erection member 53 is formed in a columnar shape, but the shape of the erection member 53 is not particularly limited. For example, the cross-sectional shape of the erection member 53 may be a polygonal shape such as a square or a hexagon, or may be another shape such as an ellipse. Further, the erection member 53 may be a solid bar shape or a hollow bar shape.

  In the above-described embodiment, the collar member 65 is interposed between the inner peripheral surface of the hole 12 a of the rod-like portion 12 and the bolt 66. However, in the present invention, the collar member 65 is not always necessary. The collar member 65 can be omitted.

  The chair 1 according to the embodiment includes the support member 55, but the support member 55 is not necessarily required and can be omitted.

  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.

DESCRIPTION OF SYMBOLS 1 Chair 12 Bar-shaped part 30 Seat part 50 Armrest 53 Construction member 55 Support member 55L Left side plate of support member 55R Right side plate of support member 56 Slide groove 56f Edge of slide groove 66 Bolt (shaft member)
80 elastic piece 82a upper end part 82b center part 82c lower end part 82ab step part

Claims (8)

A seat part on which a user is seated, a leg part that supports the seat part, a rod-like part that extends upward above the side part of the seat part in a front view, and a shaft member that extends in the left-right direction. A chair provided with an armrest supported by a rod-like portion so as to be rotatable up and down,
The armrest includes a left side plate portion and a right side plate portion that are spaced apart from each other in the left-right direction, and a rod-shaped erection member that spans between the left side plate portion and the right side plate portion,
The upper end portion and the lower end portion are fixed to the rod-like portion, and have an upper end portion, a central portion located below the upper end portion via a step portion, and a lower end portion continuous below the central portion. Comprising at least one elastically deformable elastic piece that is cantilevered without being fixed to the rod-shaped part,
When the armrest is in a vertical position where the armrest is in a substantially vertical position, the elastic member holds the erection member by the upper end portion, and between the horizontal position and the vertical position where the armrest assumes a substantially horizontal position. In some cases, the chair is configured such that the erection member slides on the central portion while being urged by the central portion. The elastic piece is disposed in front of the rod-shaped portion,
The chair according to claim 1, wherein the central portion of the elastic piece is formed in a curved shape so as to protrude forward.   The chair according to claim 2, wherein the upper end portion of the elastic piece includes an inclined surface portion inclined obliquely downward and rearward.   4. The chair according to claim 1, wherein an end portion of the elastic piece that is cantilevered is separated from the rod-shaped portion and the support member. Each having a left side plate and a right side plate formed with a substantially arc-shaped slide groove that engages with the erection member, and includes a support member fixed to the rod-like portion,
The elastic piece is fixed to the rod-shaped portion between the left side plate and the right side plate of the support member,
When the armrest is between the horizontal position and the vertical position, the central portion of the elastic piece is installed between the edge portion of the slide groove of the left side plate and the right side plate and the central portion. The chair as described in any one of Claims 1-4 comprised so that the said construction member may be urged | biased so that a member may be pinched | interposed. A left side plate disposed between the rod-shaped portion and the left side plate of the support member; and a right side plate disposed between the rod-shaped portion and the right side plate of the support member, and fixed to the rod-shaped portion. Provided with a mounting base,
The chair according to claim 5, wherein outer surfaces of the left side plate and the right side plate of the mounting base are formed as flat surfaces. The mounting base has a central plate that is spaced apart from the rod-shaped portion and connects the left side plate and the right side plate of the mounting base;
The elastic piece has a flat plate portion extending from an end portion that is not cantilevered, and the flat plate portion is fixed to the rod-shaped portion by being inserted between the central plate and the rod-shaped portion. The chair according to claim 6.   The chair according to claim 1, wherein the chair is a bathroom chair used in a bathroom.

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