JP2010268964A - Folding chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a folding chair with sufficient durability having a folding structure excellent in carrying property and storing property while reducing the weight. <P>SOLUTION: The folding chair has the leg structure 2 comprising a pair of leg frame members 7, one seat supporting member 10, and a pair of armrests 3a, fixing shafts 16 being parts of the armrests 3a and front side leg parts 6 and rear side leg parts 6 constituting the leg structure 2 are fixed, rotating shafts 17 being other parts of the armrests 3a and the seat supporting member 10 are fixed, the fixing shafts 16 and the rotating shafts 17 relatively rotate around the central axes of the armrests 3a, thereby the folding chair can be folded without the pair of seat supporting members 10 interfering with each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

 The present invention relates to an improvement of a folding chair that is easy to deploy and fold, easy to store, and has sufficient strength and durability when used.

  Folding chairs are required to be stored in a folded state and convenient to carry. In addition, such a folding chair is used outdoors such as a camping site, but sufficient strength and durability are required for use.

  Such folding chairs have various structures, and a folding chair 1 of a left-right folding type shown in FIG. 10 is known as a kind of folding chair. The folding chair 1 includes a leg structure 2, a pair of armrests 3, a backrest 4, and a seat surface 9.

  In order to be able to fold right and left, the leg structure 2 is composed of a pair of leg frame members 7 in which the front and rear leg portions 6 are connected by a base portion 5. It is rotatably connected at an intermediate portion in the axial direction of the portion 6.

  The backrest 4 and the seating surface 9 are composed of a seat member 11 constituting each of them and a pair of seat support members 10 having a substantially L shape for supporting the seat members 11.

  Each armrest 3 is made of wood, and is connected to the leg portion 6 so as to hang over the upper and lower ends of the leg portion 6 of one leg frame member 7. Further, the front end portion of one seat support member 10 is screwed to the front end portion of each armrest 3, and the rear intermediate portion of one seat support member 10 is screwed to the rear end portion of the armrest 3, respectively. It is fixed by. That is, these members are configured as a pair of left and right.

  As shown in FIG. 11, the armrest 3 and the leg 6 are connected to each other by providing notches 12 at both ends of the armrest 3 (only the front end side is shown in FIG. 11), and the upper end of the leg 6. Is inserted into the notch 12, and the upper end of the leg 6 is rotatably supported by a pivot shaft fixed to the armrest 3.

  As a result, by lifting the armrest 3, the leg frame members 7 are pivoted and folded relative to each other about the connecting portion, and the left and right armrests 3 and the seat support member 10 are maintained in a parallel relationship. The chair can be folded in the width direction (left-right direction).

  The folding chair 1 has an excellent structure with respect to foldability. However, the armrest 3 is configured by a solid wooden material because it is necessary to rotatably support the upper end portion of the leg portion 6 of the leg frame member 7 by the pivot shaft. Since the notches 12 for receiving the upper end portions of the leg portions 6 are provided at both ends of the wooden armrest 3, when the armrest 3 is subjected to strong stress, the strength at both ends is insufficient. There is a possibility.

  In addition, from the viewpoint of durability, commonality of materials, and manufacturing cost, the armrest 3 is made of a metal material such as aluminum or steel like the other metal members such as the leg frame member 7 and the seat support member 10. It may be required to do.

  However, the operation of forming a structure for supporting a leg by a notch 12 and a pivot shaft in a metal material is troublesome, increases manufacturing costs, and is not suitable for mass production. In particular, in the case of a metal material, it is difficult to use a solid material from the viewpoint of weight reduction, and a hollow material is used, but adopting the above structure for such a hollow material is compared with a solid material. However, depending on the thickness of the hollow material and the structure of the notches, there may be a problem in the durability of the armrest 3 as well.

"The design philosophy of Takeshi Nii seen in the NY chair series" (Settsu Katayama, "Study on Design Science. Summary of Research Presentation Conference", Japanese Society for the Science of Design, 2005)

  The present invention, in particular, for the folding chair of the left and right folding type, comprises all the members constituting the skeleton, including the armrests, from pipe members made of a metal material, while maintaining advantages such as storage and ease of handling. Thus, it is intended to realize a structure suitable for mass production while ensuring the durability while reducing the weight and further reducing the manufacturing cost.

  The folding chair of the present invention comprises a pair of leg frame members in which a front leg portion and a rear leg portion are connected, and the front leg portion and the rear leg portion rotate at an axial intermediate portion. A leg structure that is freely connected is provided.

  Moreover, it is substantially L-shaped and includes a pair of seat support members that support the seat and the seat on the back.

  Further, the front leg portion and the rear leg portion are fixed to a part, and a pair of armrests to which the seat support member is fixed to the other part.

  Further, the part of the armrest and the other part of the armrest rotate relatively around the central axis of the armrest, so that the pair of seat support members do not interfere with each other. Can be folded.

  More specifically, a part of the armrest is composed of a front fixed shaft fixed to the upper end of the front leg and a rear fixed shaft fixed to the upper end of the rear leg. To do.

  Moreover, let another part of the said armrest be the rotating shaft which consists of a cylindrical shaft member.

  Then, both end portions of the rotating shaft are connected to a state in which the rotating shaft can rotate relative to the front fixed shaft and the rear fixed shaft around the central axes of the front fixed shaft and the rear fixed shaft.

  Alternatively, a part of the armrest is configured by a fixed shaft having a front end fixed to the upper end of the front leg and a rear end fixed to the upper end of the rear leg.

  The other part of the armrest is constituted by a pair of cylindrical rotation shafts provided for each armrest.

  Of the rotating shafts, the front rotating shaft is connected to the intermediate portion front outer peripheral surface of the fixed shaft, the rear rotating shaft is connected to the intermediate portion rear outer peripheral surface of the fixed shaft, and the rotating shaft is connected to the fixed shaft. On the other hand, the fixed shaft and the rotating shaft are assembled so as to be relatively rotatable around the central axis.

  In any case, through holes for inserting bolts for fixing both the sheet support members are provided in a plurality of positions in the other part of the armrest in the axial direction. And in the state which inserted the volt | bolt in each of these through-holes, the other part of the armrest and the both sheet support members are fixed without being relatively rotated.

  Furthermore, it is preferable that an interference preventing structure for preventing interference between the bolt and a part of the armrest is provided at a position of the part of the armrest aligned in the axial direction of the bolt and the part of the armrest.

  In the case of the folding chair of the present invention configured as described above, each of the pair of armrests is fixed with respect to both leg portions constituting the leg frame member, and relative rotation with respect to the fixed shaft. It is comprised with the rotating shaft provided in the possible state. Further, both seat support members constituting the backrest portion are fixed to the rotating shaft, and rotate relative to the fixed shaft together with the rotating shaft.

  For this reason, when turning both the said leg frame members and folding a chair, it can prevent that the upper end parts of the said both seat support members contact | abut.

  Further, if the fixed shaft is composed of a front fixed shaft fixed to the upper end portion of the front leg portion and a rear fixed shaft fixed to the upper end portion of the rear leg portion, the weight of the armrest is reduced. Therefore, the weight of the entire folding chair can be reduced.

  In addition, the axial length of the front fixed shaft and the rear fixed shaft can be secured to some extent, or the fixed shaft can be secured to the upper end of the front leg with the front end of the fixed shaft and the rear end with the rear end. If it is constituted by one fixed shaft member fixed to the upper end portion of the leg portion, durability can be improved.

  Further, in the case of the structure as described above, the front fixed shaft, the rear fixed shaft, and the fixed shaft member are aligned with the positions of the screws in the axial direction, and the screws, the front fixed shaft, and the rear fixed shaft. Providing an interference prevention structure that prevents interference with the side fixed shaft and the fixed shaft member may prevent the rotational shaft from rotating relative to the fixed shaft when the rotational shaft is rotated. Absent.

  In addition, the folding chair of the present invention can be entirely constituted by a pipe member made of metal such as aluminum or steel. For this reason, it has high rigidity and high durability against water and the like, and sufficient durability can be obtained even when used outdoors (especially on the coast or riverbed) such as a camping site.

  Furthermore, each part which comprises the folding chair of this invention can be shape | molded by die-casting etc. For this reason, manufacturing cost can be reduced and a structure suitable for mass production can be realized.

It is a perspective view which shows the one aspect | mode of the folding chair of this invention. It is a partial cutaway sectional view in the state seen from the right side of Drawing 1 showing the support structure to the leg frame member of the armrest in the 1st example of an embodiment of the invention. It is a schematic diagram which shows the operation | movement of expansion | deployment and folding in the one aspect | mode of the folding chair of this invention. The perspective view for demonstrating the folding operation | movement of a folding chair whose backrest is another structure. It is a figure similar to FIG. 2 which shows the 2nd example of embodiment of this invention. FIG. 6 is a cross-sectional view taken along the line II in FIG. 5. It is a fragmentary perspective view which shows the relationship between an armrest, the leg frame member, and a sheet | seat support member in the 3rd example of embodiment of this invention. It is a figure similar to FIG. 2 in the 3rd example of embodiment of this invention. FIG. 9 is a cross-sectional view of the roll of FIG. 8. It is a perspective view which shows the 1st example of a conventional structure. It is a figure equivalent to the X section of Drawing 10 showing the structure which prevents contact of the upper end parts of the sheet support member at the time of folding in the 1st example of conventional structure.

[First example of embodiment]
1-3, the 1st example of embodiment of the folding chair of this invention is shown. The main feature of the folding chair 1a of this example is that the structure of the armrest 3 is devised in the folding chair 1 shown in FIG. Since the structure and operation other than the features of the present invention have substantially the same configuration as that of the folding chair 1 having the conventional structure shown in FIG. 10, the same parts are denoted by the same reference numerals, and redundant description is omitted or simplified. To.

  FIG. 2 is a view showing the structure of the right armrest 3a among the pair of armrests 3a constituting the folding chair 1a shown in FIG. The left armrest 3a has a structure that is symmetric with respect to the structure in FIG. 2 and the width direction of the chair (the left-right direction in FIGS. 1 and 3). For this reason, when the folding chair 1a is folded and unfolded, the left armrest 3a operates symmetrically and simultaneously with the right armrest 3a. Hereinafter, the structure of the right armrest 3a will be described.

  Similar to the conventional folding chair 1 shown in FIG. 10, the folding chair 1 a of this example includes a leg structure 2, a pair of armrests 3 a, a backrest 4, and a seat surface 9. In particular, in the case of this example, as shown in FIG. 2, the armrest 3 a is configured by a fixed shaft 16 and a rotating shaft 17 connected in the axial direction. The fixed shaft 16 corresponds to a part of the armrest 3a, and the rotation shaft 17 corresponds to another part of the armrest 3a.

  In the present invention, in addition to the leg frame member 7 constituting the leg structure 2, the backrest 4 and the seat support member 10 constituting the seat surface 9, the armrest 3 a is also made of a metal material. As the metal material, various metals can be appropriately selected according to the use environment, application, etc., for example, light metal material such as aluminum and aluminum alloy, iron material, iron alloy material such as steel, etc. Can be used. Such a metal material is constituted by a cylindrical member (hollow material) such as a metal pipe from the viewpoint of weight reduction.

  The sheet member is formed of a flexible sheet material such as a woven fabric. In this example, the backrest 4 and the seating surface 9 are configured by one seat member, but the backrest 4 and the seating surface 9 may be configured by two seat members, respectively.

  Of the armrests 3a, the fixed shaft 16 is fixed to the upper end of the front leg 6 in each of the leg frame members 7 constituting the leg structure 2, and is a front fixed shaft 18 that is a hook-shaped member made of a metal material. And a rear-side fixed shaft 19 that is fixed to the upper end of the rear-side leg portion 6 and is also a hook-like member made of a metal material. Further, one end of the front and rear fixed shafts 18 and 19 (in the case of the front fixed shaft 18, it is the front end, and in the case of the left and rear fixed shaft 19 in FIG. 2, it is the rear end, FIG. 2), as shown in FIG. 2, a connecting portion 21 that extends in the radial direction of the fixing shafts 18 and 19 and is fixed to the upper end portions of the front and rear legs 6 is welded. And so on.

  The front and rear fixed shafts 18 and 19 and the coupling portion 21 can be integrally formed by die casting or the like.

  In addition, the fixed shaft 18 is a substantially L-shaped cylindrical member, and a coupling portion that can be inserted and coupled to the rotary shaft 17 or the leg portion 6 is screwed or fitted into an opening that faces in a direction substantially perpendicular to each other. Each may be fixed.

  On the other hand, the rotating shaft 17 corresponding to the other part of the armrest 3a is a cylindrical shaft member made of a metal material. A pair of through-holes 23 is provided in each. Note that the outer peripheral surface of the intermediate portion of the rotating shaft 17 can be covered with a cylindrical cushion material 24 (see FIG. 1) made of rubber, plastic, or cloth.

  As shown in FIG. 2, the front and rear leg portions 6, the front and rear fixed shafts 18 and 19, and the rotating shaft 17 are connected to the front and rear fixed shafts 18 and 19 at both ends of the rotating shaft 17. And the leg frame member 7 and the front and rear fixed shafts 18 and 19 are assembled so as to sandwich the rotating shaft 17 to constitute the armrest 3a. Further, the outer diameters of the front end portions of the front and rear fixed shafts 18 and 19 are smaller than the inner diameters of both end portions in the axial direction of the rotating shaft 17 (may have the same structure as a connecting portion 21 described later). The front and rear fixed shafts 18 and 19 are capable of relative rotation about the rotation shaft 17 and the central axes of the front and rear fixed shafts 18 and 19.

  Grooves 22 are formed on the outer peripheral surface of the distal end portion of each coupling portion 21 over the entire circumference, and the outer peripheral surface of the distal end portion is fitted into the cylindrical portions of the upper end portions of the front and rear leg portions 6. Further, the coupling portion 21 and each leg portion 6 are coupled and fixed by crimping a position that aligns with the groove 22 in the outer peripheral surface of the upper end portion of the leg portion 6. In addition, it may be fixed by other means such as screwing.

  Further, using bolts 20 (omitted in FIG. 2), each through hole 23 formed in the portion near both ends of the axial intermediate portion of the rotating shaft 17 and aligned in the radial direction, and through holes provided in both sheet support members 10 are provided. (Not shown) is penetrated, and the rotation shaft 17 and the sheet support member 10 are coupled and fixed by a nut (not shown) without relative rotation. The seat support member 10 is provided with through holes corresponding to the front end portion and the rear intermediate portion.

  As described above, the positions of the front end surfaces of the front and rear fixed shafts 18 and 19 in the state in which the respective members are assembled are in front of the front bolts 20 (front through holes 23) with respect to the front fixed shaft 18. In addition, with respect to the rear side fixed shaft 19, the bolts 20 interfere with the front side and rear side fixed shafts 18, 19 so as to be positioned rearward of the rear side bolt 20 (rear side through hole 23). To prevent it.

  The operation of folding the folding chair 1a having the above-described structure will be described below with reference to FIG. 3 schematically showing the mechanism of the folding chair 1a.

  First, from the state shown in FIG. 3 (a), as the pair of leg frame members 7 are rotated, both the armrests 3a and both the seat support members 10 are displaced in directions close to each other. Of the two rotating shafts 17 of the armrest 3a, the right rotating shaft 17 is rotated in the direction of arrow A, and the left rotating shaft 17 is rotated in the direction of arrow B. In this way, the sheet support members 10 are folded to the state shown in FIGS. 3B to 3C while keeping the sheet support members 10 at a predetermined angle.

  In addition, in the operation | movement which expands the folding chair 1a of this example, what is necessary is just to perform operation | movement contrary to folding operation | movement from the state shown in FIG.3 (c) to the state shown to Fig.3 (a).

  In the case of the folding chair 1a of this example, both the seat support members 10 are coupled and fixed in a state where they are not relatively rotated with respect to the both rotating shafts 17, and the rotating shaft 17 can be rotated relative to the both fixed shafts 16. It is assembled to. For this reason, as described above, the sheet support members 10 can be folded without interfering with each other by moving the sheet support members 10 in parallel while maintaining a certain angle. Improvements can be made.

  Further, since the axial lengths of the front and rear fixed shafts 18 and 19 constituting the both fixed shafts 16 are shortened and both the rotating shafts 17 are cylindrical, the weight of the armrest portion can be reduced. .

  Moreover, by using the armrest as a pipe member made of a metal material (especially, a light metal material such as aluminum), the strength against the load during use can be ensured while being lightweight, and further, it can be used outdoors. On the other hand, sufficient durability can be ensured.

  Moreover, each component which comprises the folding chair 1a of this example can be shape | molded by die-casting etc. For this reason, manufacturing cost is suppressed and it is suitable for mass production.

  In addition, the seat support member 10 constituting the backrest 4 can be structured such that two members are foldably coupled by a pivot pin or the like as shown in FIG. In the case of such a folding chair, the folding operation shown in FIG. 3 described above is performed after the backrest 4 is folded in the state shown in FIG. Even in such a structure, the same operation and effect as the first example of the embodiment can be obtained, and the folding chair can be stored in the height direction by the amount of folding of the backrest 4. Improvements can be made.

[Second Example of Embodiment]
5 and 6 show a second example of the embodiment of the present invention. In the second example, only the structure of the armrest is different from that of the first example, and the other structure is the same as that of the first example. 5 and 6 show only the structure of the right armrest 3b. As in the first example, the left armrest 3b is folded with the right armrest 3b when the folding chair is folded and unfolded. It will operate symmetrically and simultaneously.

  In the folding chair of this example, the axial lengths of the front and rear fixed shafts 18a and 19a constituting the fixed shaft 16a corresponding to a part of the armrest 3b are set to the front side of the folding chair 1a of the first example of the embodiment. In addition, the rear fixed shafts 18 and 19 are longer. Further, the front and rear fixed shafts 18a and 19a are shaft members having at least a tip-like hook shape.

  Further, in the axially intermediate portion of the front and rear fixed shafts 18a and 19a, at the position where they are assembled and aligned with the bolts 20 (see FIG. 6, omitted in FIG. 5), a buffering prevention structure with the bolts 20 is provided. The interference prevention through hole 25 is formed. In addition, the width direction (left-right direction of FIG. 5) dimension of the interference prevention through-hole 25 should just be a magnitude | size which is an extent which does not interfere with each said bolt 20 in this width direction.

  The interference prevention structure is not limited to the structure of the interference prevention through hole 25 of this example and the interference prevention through hole 25a of the third example of the embodiment described later. Various structures that can prevent interference between the rotating shaft and the bolt 20 that joins the seat support member 10 and the fixed shaft can be employed.

  As shown in FIG. 6, each interference prevention through hole 25 has a substantially ribbon shape in cross section, and each bolt 20 has a predetermined direction (FIG. 6) from the state shown in FIG. In a clockwise direction), the shape can be rotated by a predetermined angle (about 60 degrees). FIG. 6 shows the positional relationship between each bolt 20 and the interference prevention through-hole 25 when the folding chair of this example is in use.

  Further, when each bolt 20 is rotated in a predetermined direction by a predetermined angle, each bolt 20 comes into contact with the circumferential side surface 26 of each interference prevention through hole 25. For this reason, it does not rotate more than the predetermined angle in the predetermined direction.

  Further, when each bolt 20 rotates in the direction opposite to the predetermined direction (the upper direction in FIG. 5, the direction opposite to the timepiece in FIG. 6), it abuts on the circumferential side surface 26 a of each interference prevention through hole 25. For this reason, it does not rotate more in the opposite direction than the state shown in FIG.

  In the case of such a folding chair of this example, as in the first example, in the folding operation, both the armrests 3b are accompanied by the rotation of the pair of leg frame members 7 from the state shown in FIG. (3a in FIG. 3) and the two sheet support members 10 are displaced in the direction of approaching each other, and at the same time, the right rotation shaft 17 of both rotation shafts 17 of both armrests 3b is moved in the direction of the arrow A to the left side. The rotating shaft 17 is rotated in the direction of arrow B. In this way, the sheet support members 10 are folded to the state shown in FIGS. 3B to 3C while keeping the sheet support members 10 at a predetermined angle. At this time, since each interference preventing through hole 25 is formed, each bolt 20 can rotate without interfering with the front and rear fixed shafts 18a and 19a within the predetermined angle.

  Further, with each bolt 20 rotated in the predetermined direction by a predetermined angle, the intermediate portion of the bolt 20 contacts the circumferential side surface 26 of each interference prevention through hole 25. For this reason, it is possible to prevent further rotation in the predetermined direction, and it is possible to prevent the distance between the upper end portions of the two sheet support members 10 from being unnecessarily widened in the folded state.

  Further, during assembly, the rotation shaft 17 is rotated in a direction opposite to the predetermined direction, thereby adjusting the angles of the two sheet support members 10 in the use state. At this time, if each of the bolts 20 is rotated until it comes into contact with the circumferential side surface 26a, both the sheet support members 10 can be adjusted to an appropriate angle without requiring special adjustment.

  Further, the axial lengths of the front and rear fixed shafts 18a and 19a constituting the fixed shaft 16a of the folding chair of this example are longer than those of the folding chair 1a of the first example of the embodiment. For this reason, compared with the said 1st example, although a weight becomes large, the rigidity in the assembly | attachment state of the front side and rear side fixed shaft 18a, 19a and the rotating shaft 17 can be made high.

  In the case of this example, the front end portions of the front and rear fixed shafts 18a and 19a are ridge-shaped members, but may be configured by cylindrical members. In this case, the structure of the interference prevention through-hole can be a structure such as an interference prevention through-hole 25a of a third example of an embodiment described later.

  Since the structure and operation of the other parts are the same as in the first example of the above-described embodiment, the same parts are denoted by the same reference numerals, and redundant description is omitted.

[Third example of embodiment]
7 to 9 show a third example of the embodiment of the present invention.

  In the folding chair 1b of this example, the fixed shaft 16b corresponding to a part of the armrest 3c is constituted by a cylindrical shaft member made of a lightweight metal such as aluminum. Moreover, the coupling | bond part 21 for couple | bonding and fixing to the upper end part of the leg part 6 which comprises the leg frame member 2 is couple | bonded with the both ends of the fixed shaft 16b by welding.

  Further, at the axially intermediate portion of the fixed shaft 16b, the bolts 20 for fixing the rotating shaft 17a, which will be described later, and the seat support member 10 constituting the backrest 4 and the seating surface 9, are aligned with each other in the assembled state. Has an interference prevention through hole 25a as a structure for preventing interference with the screw 20.

  As shown in FIGS. 8 and 9, each interference prevention through hole 25a has a bolt 20 in a predetermined direction (the lower direction in FIG. 8, the clockwise direction in FIG. 9) within each interference prevention through hole 25a. The shape is rotatable by a predetermined angle (about 60 degrees). In addition, FIG. 9 has shown the positional relationship of each bolt 20 and the interference prevention through-hole 25a in the use condition of the folding chair 1b of this example.

  Further, when each bolt 20 is rotated by the predetermined angle, the intermediate portion in the axial direction of the bolt 20 contacts the circumferential side surface 27 of each interference prevention through hole 25a. For this reason, it does not rotate more than the predetermined angle in the predetermined direction.

  Further, when each bolt 20 rotates in the direction opposite to the predetermined direction (the upper direction in FIG. 8 and the direction opposite to the timepiece in FIG. 9), it abuts on the circumferential side surface 27a of each interference prevention through hole 25a. For this reason, it does not rotate more in the opposite direction than in the state shown in FIG.

  Further, the rotating shaft 17a corresponding to the other part of the armrest 3c is constituted by a pair of cylindrical members. Further, of the rotating shafts 17a, the rotating shaft 17a on the front side (left side in FIGS. 7 and 8) is arranged on the front outer peripheral surface of the intermediate portion of the fixed shaft 16b, and the rotating shaft 17a on the rear side (right side in FIGS. 7 and 8). Are assembled to the outer peripheral surface on the rear side of the intermediate portion of the fixed shaft 16b so as to be relatively rotatable with respect to the fixed shaft 16b around the central axes of the fixed shaft 16b and the rotating shaft 17a. Both rotating shafts 17 a are fixed by bolts 20 in a state where they do not rotate relative to the sheet support member 10.

  In the case of the folding chair 1b of this example, in the folding operation of the folding chair 1b, the fixed shafts 16b are rotated in a direction to bring them closer to each other. At this time, the rotary shaft 17a is assembled to the fixed shaft 16b in a state where relative rotation is possible. Further, both the rotation shafts 17a and the sheet support member 10 do not rotate relative to each other. For this reason, the sheet support members 10 can be translated in a direction approaching each other while maintaining a constant angle as shown in FIG. For this reason, it can fold in the state shown in Drawing 3 (c), without the upper end part of both sheet supporting members 10 interfering.

  When the rotation shaft 17a rotates by the predetermined angle as the seat support member 10 rotates, the intermediate portion of each bolt 20 comes into contact with the circumferential side surface 27 of each interference prevention through hole 25a. For this reason, it is possible to prevent further rotation in the predetermined direction, and it is possible to prevent the distance between the upper end portions of the two sheet support members 10 from being unnecessarily widened in the folded state.

  Further, at the time of assembly, if both the sheet support members 10 are rotated until each bolt 20 contacts the circumferential side surface 27a, the both sheet support members 10 are not required to be adjusted. Can be adjusted to an appropriate angle.

  Further, the fixed shaft 16b of the folding chair 1b of the present example is composed of one continuous shaft member. For this reason, compared with the folding chairs of the first example and the second example of the embodiment, the rigidity in the assembled state of the fixed shaft 16b and the rotating shaft 17a can be increased.

  In addition, although the fixed shaft 16b of this example is cylindrical, when it is desired to further increase the rigidity, it can be a bowl-shaped member. In such a case, the structure of the interference prevention through hole 25a can be the structure as in the second example of the embodiment described above.

  Since the structure and operation of the other parts are the same as in the second example of the above-described embodiment, the same parts are denoted by the same reference numerals, and redundant description is omitted.

  The present invention is applied to a left and right folding type folding chair that can be folded and unfolded between a folded state that is a stored state and a use state that is an unfolded state.

DESCRIPTION OF SYMBOLS 1 1a 1b Folding chair 2 Leg structure 3 3a 3b 3c Armrest 4 Backrest 5 Leg frame base 6 Leg 7 Leg frame member 9 Seat surface 10 Seat support member 11 Seat member 12 Notch 16 16a 16b Fixed shaft
17 Rotating shaft 18 18a Front fixed shaft 19 19a Rear fixed shaft
20 volts
21 coupling portion 22 groove 23 through hole 24 cushioning material 25 25a interference prevention through hole 26 26a circumferential side surface 27 27a circumferential side surface

Claims (4)

A leg composed of a pair of leg frame members in which a front leg part and a rear leg part are connected, and the front leg part and the rear leg part are rotatably connected at an axially intermediate part. Structure and
A pair of seat support members that are substantially L-shaped and support the seat and the seat on the back;
A folding chair comprising a pair of armrests in which the front leg portion and the rear leg portion are fixed to a part, and the seat support member is fixed to another part,
The part of the armrest and the other part of the armrest rotate relative to each other about the central axis of the armrest so that the pair of seat support members can be folded without interfering with each other. A folding chair is possible. A part of the armrest is a front fixed shaft fixed to the upper end of the front leg, and a rear fixed shaft fixed to the upper end of the rear leg;
The other part of the armrest is a rotating shaft made of a cylindrical shaft member,
The folding chair according to claim 1, wherein both ends of the rotating shaft are connected to the front fixed shaft and the rear fixed shaft. A part of the armrest is composed of a fixed shaft with a front end fixed to the upper end of the front leg and a rear end fixed to the upper end of the rear leg,
The other part of the armrest is composed of a pair of cylindrical rotating shafts provided for each armrest,
2. The folding according to claim 1, wherein, among the rotation shafts, the front rotation shaft is assembled to the intermediate portion front outer peripheral surface of the fixed shaft, and the rear rotation shaft is assembled to the intermediate portion rear outer peripheral surface of the fixed shaft. Chair. Through holes for inserting bolts for fixing the two sheet support members are provided at a plurality of other axial positions in the other part of the armrests, and the armrests are inserted into the respective through holes. The other part and the both sheet support members are fixed in a state where they do not rotate relative to each other.
The interference prevention structure which prevents interference with this bolt and a part of this armrest is provided in the position where the part of the said armrest aligns with this bolt and a part of this armrest in the axial direction. Or the folding chair described in 3.

Images