JP2007159815A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair to which armrests can be attached as an option, wherein reduction of a burden on an operator in the case of attaching, improvement in attaching strength, reduction of production costs, etc. are attained at the same time. <P>SOLUTION: The horizontal part 63 of an elbow support 61 is welded and fixed while it is put through a connecting fitting 65, and a notch groove 64a is formed at a fitting convex part 64, and a fitting recess place 52 is formed at a projecting part 51 of the base 6. At a deep bottom surface, a rib-like projection 52a engaging with the notched groove 64a is formed. By making the groove 64a bite into the rib-like projection 52a, the connecting fitting 65 is superposed from its lower side while the fitting convex part 64 of the horizontal part 63 is fitted into the fitting recess place 52. In this state, the connecting fitting 65 is fastened to the projecting part 51 with a screw 66 from its lower side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a chair.

  For example, a swivel chair frequently used for office work or the like can generally be attached with an armrest as an option. An armrest is generally equipped with an elbow rest on which a person's elbow rests and an elbow strut that supports the elbow rest from below, and the mounting structure includes a seat mounting type and a backrest mounting type. Broadly divided.

  The former type is often fixed to a synthetic resin shell member that supports the seat, or to a metal plate base provided at the upper end of the leg. In this case, in most cases, the lower end portion of the elbow strut is overlapped with the elbow fixing portion of the shell member or the base from below, and is fastened with about 3 to 4 screws (screws or bolts). .

  As an example of such an attachment structure, Patent Document 1 discloses a curved shape that can be closely attached to the lower surface of the shell member of the elbow strut while forming a downward opening-shaped positioning recess on the lower surface of the curved shell member. An upper protrusion that fits into the positioning recess is integrally formed at the lower end, and the lower end of the elbow strut can be fastened to the shell member with a screw in a state where the upward protrusion is fitted into the positioning recess. It is disclosed.

On the other hand, the applicant of the present application disclosed in Patent Document 2 according to the prior application that the connecting bracket provided on the horizontal portion of the elbow post in the armrest is fixed to the left and right sides of the base supported by the leg post. In a chair that is fastened with screws overlaid on the upper part, the upper part of the elbow fixing part overlaps as an engagement means for holding the armrest in the same posture as after fastening to the connecting bracket on the armrest side. It has been proposed that a stop piece is provided and a notch portion into which the lock piece fits is formed at a portion of the elbow fixing portion where the lock piece overlaps.
JP 7-246129 A JP 2005-152157 A

  By the way, as mentioned above, the armrest is often an option to be ordered by the user as needed, and the body part of the chair (seat and backrest) has the same structure with and without the armrest. It is almost. Some chairs are sold without armrests, and other chairs may be used without the armrests attached.

  When attaching an armrest in the chair of Patent Document 1, the operator holds the armrest with one hand and holds it in a predetermined posture, while performing a screwing operation with a screwdriver with the other hand. By fitting the upward protrusion on the elbow strut into the positioning recess on the shell member side, there is an advantage that the screw holes formed in the lower end portion of the elbow strut and the shell member can be easily and reliably aligned.

  However, the upward projection on the elbow post side and the positioning recess on the shell member side fit in the vertical direction, so the operator must lift the armrest firmly with one hand until the first screw is screwed in. Unless it is placed, the armrest cannot be maintained. For this reason, the operator is forced to work while paying attention so that the fitting between the upward protrusion and the positioning recess is not displaced (so that the screw holes are not displaced from each other). In addition to being heavy, there was a problem of poor work efficiency.

  There is also a method of turning the chair upside down and placing it on a table etc., and screwing the armrests in this state, but in this case it is also a burden on the operator, and in addition, when the chair is turned over and placed on the table There was also a risk of soiling or damaging the seat.

  On the other hand, if it comprises like patent document 2 which concerns on the prior application of the applicant of this application, the armrest is not grasped by one hand by overlapping the locking piece on the elbow fixing part at the position of the notch part. In addition, since the operator is held in a predetermined mounting posture, the operator can have both hands free. As a result, there is an advantage that the burden on the operator can be reduced and the mounting operation of the armrest can be performed efficiently.

  The present invention further develops the concept of Patent Document 2 relating to the prior application, and not only improves the workability of mounting the armrest, but also a chair that takes into consideration the aspects of improving the mounting strength of the armrest and reducing manufacturing costs. It is a technical issue to provide.

  In order to solve this technical problem, the invention of claim 1 includes a seat and an armrest on which an elbow rest on which an elbow of a seated person is placed is supported from below by an elbow strut, and a lower end portion of the elbow strut A horizontal part is provided on the horizontal part, and a fastening part protruding outside the horizontal part is provided on the horizontal part, and the fastening part is overlapped with an elbow fixing part of another member and fastened with a screw. The horizontal portion of the elbow strut and the elbow fixing portion are provided with fitting means that fit each other and hold the mounting posture of the armrest when the elbow strut is moved horizontally. That's it.

  According to a second aspect of the present invention, in the chair according to the first aspect, the elbow strut is made of a round pipe, and rises vertically in a front view on the left and right outer sides of the seat, and the horizontal portion at the lower end is substantially the same. It has a form extending in the left-right direction, and has a stepwise connection in a front view having a horizontal upper overlapping portion and a lower overlapping portion as a fastening portion and a vertically long portion connecting them to the horizontal portion of the elbow strut. A metal fitting is attached, and the tip of the horizontal portion of the elbow strut is a fitting projection as part of the fitting means through the vertically long portion of the coupling metal fitting. While a notch groove is formed in the front end surface of the convex portion, a base fixed to the upper end of the leg support is disposed below the seat, and the connecting metal fitting is provided on the left and right sides of the base. The elbow fixing part where the upper overlapping part and the lower overlapping part overlap from below In the elbow fixing part, as a part of the fitting means, a fitting recess into which the fitting convex part of the elbow post fits is formed so as to open to the left and right outwards, When the fitting convex portion is fitted into the fitting recess, the fitting concave portion engages with the notch groove of the fitting convex portion to hold the elbow strut so as not to rotate around the axis of the horizontal portion. The engaging protrusion to be formed is formed.

  According to the present invention, since the elbow strut is provided with fitting means for fitting the elbow struts to each other when the elbow struts are horizontally moved to hold the mounting posture of the armrests. Even if it is not lifted firmly, there is little possibility that the fitting means will come off at the time of attachment, and it is easy to maintain the attachment posture of the armrest. Even if the fitting of the fitting means is slightly loose, the mounting posture of the armrest can be maintained as long as the operator puts one hand on the armrest until the first screw is screwed. Therefore, the burden on the operator is reduced, and the armrest can be mounted efficiently.

  In addition, since the fitting means provided in the horizontal portion of the elbow post and the elbow fixing portion are fitted to each other when the elbow post is moved horizontally, a downward external force acts on the entire armrest. However, the fitting of the fitting means is difficult to come off. Therefore, there is also an effect that the mounting strength of the armrest is remarkably improved without impairing the ease of mounting.

  In particular, when the fitting convex portion in the horizontal portion of the elbow strut and the fitting recess formed in the elbow fixing portion of the seat are fitted in the left-right direction, the fitting convex portion is configured as in the second aspect. Because the coupling fitting attached to the horizontal portion can be set at an accurate position with respect to the elbow fixing portion by the engagement between the notch groove of the portion and the engagement protrusion formed in the fitting recess. In addition, it is easy to align the screw holes of the connecting metal fitting and the elbow fixing portion, and as a result, there is an effect that the mounting work of the armrest can be performed efficiently.

  In addition, since the elbow strut is made of a round pipe and the fitting convex portion uses a portion of the elbow strut that penetrates the connecting bracket, material cost and processing cost can be reduced, and the armrest It becomes possible to reduce the manufacturing cost as a whole.

  DESCRIPTION OF EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings (FIGS. 1 to 7). FIGS. 1-7 is an example which applied this invention to the rotation type chair often used for office work. 1 is a front view of the chair, FIG. 2A is a plan view of the chair, FIG. 3B is a left side view, FIG. 3 is an exploded perspective view of the base, FIG. 4 is a longitudinal side view of the base, and FIG. Among them, (A) is a perspective view of the horizontal portion of the elbow support viewed from above, (B) is a perspective view of the elbow post viewed from below, and (A) of FIG. 6 is a perspective view of the base viewed from the rear. FIG. 7A is a right side view, FIG. 7A is a longitudinal front view of an armrest attached to the base, and FIG. 7B is a separated longitudinal front view showing the attachment relationship between the armrest and the base.

(1). Outline of Chair First, an outline of a chair will be described with reference to FIGS.

  The chair includes a leg 1, a seat 2, a backrest 3, and a pair of left and right armrests 4 (the armrest 4 has a pair of left and right, but only one of them is shown in the figure). The leg 1 includes a leg column 5 made of a gas cylinder and a plurality of (five) branch legs extending radially, and a caster is provided at the tip of each branch leg 6.

  A base 6 that opens upward is attached to the upper end of the leg column 5, a seat receiving shell 7 is attached to the upper surface of the base 6, and a seat 2 is attached to the seat receiving shell 7. . A lock lever 8 for switching the backrest 3 between a state in which the backrest 3 can be tilted backward and a state in which the backrest 3 cannot be tilted is exposed from the left side surface of the base 6. The elevating lever 9 for adjusting is exposed. The lifting lever 9 extends in the left-right direction along the lower surface of the front portion of the seat 2.

  The backrest 3 includes an outer shell 10 made of synthetic resin. The outer shell 10 is formed in a form in which a back rest 10a that supports the back of a seated person and a waist rest 10b that supports the waist of the seated person are vertically connected. 1 has a lower part 10c extending downward from 1, and this lower part 10c controls the mounting function. As shown in FIG. 3, the lower portion 10 c of the outer shell 10 is formed in a rounded mountain shape with a downward convexity when viewed from the front. Cushion bodies 11 and 12 are mounted on the front surfaces of the back pad 10a and the waist pad 10b, respectively.

  The backrest 10a of the backrest 3 is formed in a substantially inverted trapezoidal shape (see FIG. 1), while the upper part of the backrest 10a is widest and the width is reduced downward (see FIG. 1), while the waist rest 10b is substantially elliptical when viewed from the front. For this reason, the boundary between the back pad 10a and the waist pad 10b has a narrow profile with a smooth curve in front view.

  In addition, as can be understood from FIG. 2A, the left and right side portions of the waist rest portion 10b are formed in a chevron shape that protrudes forward from the back rest portion 10a and is convex forward in a side view. The left and right side portions of the portion 10b are thick portions 10d that are much thicker than other portions. The thick part 10d extends to a part of the lower part 10c.

  A back support unit 13 shown in FIGS. 2B, 3, and 4 is attached to the base 6 so as to be able to tilt backward, and the outer shell 10 of the backrest 3 is attached to the back support unit 13. The back support unit 13 is elastically supported by a spring unit 14. The spring unit 14 is covered with a cover 15 from below. A handle 44 for adjusting the magnitude of the spring force (resistance) of a spring (not shown) provided in the spring unit 14 is exposed on the lower rear surface of the backrest 3.

  The base 6 of this embodiment is a molded product of metal or resin such as aluminum die casting (of course, a sheet metal product may be used). The seat 2 has a structure in which a cushion is stretched on a shell-like seat plate made of a synthetic resin, and although details are omitted, the shell-like seat plate is detachably attached to the seat receiving shell 7.

  As shown in FIGS. 3 and 4, the front end portion of the frame body 16, which is one component of the back support unit 13, has a pivot shaft 16 a that is long to the left and right, and the pivot shaft 16 a can rotate to the base 6. Is attached. Specifically, a lower bearing 19 that overlaps the rotating shaft 16a from below and an upper bearing 20 that overlaps from above are disposed inside the base 6 so that the bearings 19 and 20 cannot be detached by the pressing member 21. (See FIG. 4).

  The pressing member 21 is fixed to the upper surface of the boss portion 22 formed on the base 6 with screws 23. The upper and lower bearings 19 and 20 are fitted to each other so as not to come off. In the present embodiment, the lower bearing 19 also has a function of preventing the lifting lever 9 from coming off and a bearing.

  As schematically shown in FIG. 3, a resin guide member 24 in which both left and right side portions are vertically formed is inserted and mounted on the upper surface of the rear portion of the base 6. The back support unit 13 is held by the above-described guide member 24 so that it cannot be displaced left and right. Further, as shown in FIG. 4, the frame body 16 of the back support unit 13 is prevented from turning upward by a left and right long metal stay 25 screwed to the base 6.

  As shown in FIGS. 3 and 4, a rotation shaft 30 is attached to the lock lever 8 so as not to be relatively rotatable. A pair of left and right stoppers 26 located inside the base 6 are relatively rotated on the rotation shaft 30. It is attached impossible.

  The left and right stoppers 26 are located below the longitudinal front and rear portions of the frame body 16 in the back support unit 13 and are placed on the bottom of the base 6 so as not to be displaced (see FIG. 3). It is supported by. By rotating the lock lever 8 and changing the stopper 26 between the standing posture and the laterally tilted posture, the back support unit 13 can be switched between the backward tiltable state and the backward tiltable state.

  Although not described in detail, the receiving member 27 is provided with an engaging portion (not shown) that is elastically deformed and fitted into and removed from the stopper 26, and the stopper 26 is provided on the engaging portion of the receiving member 27 by the rotation of the lock lever 8. The stopper 26 is selectively held in a standing posture (locking posture) and a laterally falling posture by being fitted and detached.

(2). Armrest and its mounting structure Next, the armrest and its mounting structure will be described with reference to FIGS. 1, 2 and 5 to 7.

  The armrest 4 includes an elbow strut 61 made of a round pipe that extends upward on the left and right sides of the seat 2, and an elbow rest 62 attached to the upper end of the elbow strut 61. As shown in FIG. 2B, the elbow struts 61 of the left and right armrests 4 in the present embodiment are both tilted forward at the same angle in a side view. In addition, the elbow rest 62 of this embodiment is attached to the elbow support 61 so that the height can be adjusted and the horizontal swing is possible. Of course, the elbow rest 62 is not limited to a movable type and may be a fixed type.

  The lower part of the elbow post 61 is formed in a substantially L shape by bending the lower part thereof along the lower surface of the base 6. For this reason, the lower part of the elbow post 61 is a horizontal part 63. As a part of the fastening portion described in the claims, a metal fitting 65 made of a metal plate is fixed to the front end portion of the horizontal portion 63 by welding. The connecting fitting 65 includes an upper overlapping portion 65a, a lower overlapping portion 65b, and a vertically long portion 65c that connects them, and is formed in a stepped shape when viewed from the front. As shown in FIG.5 and FIG.7, the front-end | tip part of the horizontal part 63 in the elbow support | pillar 61 has penetrated the longitudinally long part 65c of the connection metal fitting 65, and a penetration part and the upper end part of the vicinity of the horizontal part 63 are shown. Is welded to the connection fitting 65. The part which protruded from the vertically long part 65c of the connection metal fitting 65 among the horizontal parts 63 is the fitting convex part 64 as a part of fitting means described in the claim. A pair of notch grooves 64a are formed on the front end surface of the fitting convex portion 64 at positions facing each other across the axis (see FIG. 5A).

  On the other hand, as shown in FIG. 2 (B), FIG. 4 and FIG. 6, on the left and right rear sides of the base 6, a stepped shape in which an upper overlapping portion 65a and a lower overlapping portion 65b of the connecting metal 65 overlap from below. The projecting portion 51 is integrally formed so as to project outward in the left-right direction, and the left-right projecting portion 51 is a fitting that opens outward in the left-right direction as part of the fitting means described in the claims. A concavity 52 is formed.

  The fitting recess 52 is formed in a large-diameter round hole shape and a shallow bottom so that the fitting protrusion 64 of the horizontal portion 63 fits tightly. When the fitting convex portion 64 of the horizontal portion 63 is fitted in the fitting recess 52 from the left and right direction, the rib-like projection 52a (engaging projection) having a non-circular side view that engages with the pair of notch grooves 64a. ) Projecting outward from the left and right.

  In this case, the fitting convex portion 64 is fitted into the fitting concave portion 52 from the left and right directions, and the pair of the notch grooves 64a of the fitting convex portion 64 is engaged with the rib-like protrusion 52a of the fitting concave portion 52. As a result, the elbow support 61 and thus the entire armrest 4 are held unrotatable around the horizontal portion 63, and the mounting posture (forward tilting posture) of the armrest 4 is determined. Accordingly, the pair of cutout grooves 64 a of the fitting convex portion 64 in the horizontal portion 63 and the rib-like protrusion 52 a of the fitting recess 52 in the left and right projecting portion 51 function as a rotation preventing means for the armrest 4. .

  Needless to say, the depth D of the fitting recess 52 is set to be as shallow or short as the protruding length L of the fitting convex portion 64 from the vertically long portion 65c. In the present embodiment, when the armrest 4 is attached to the base 6, the formation position of the notch groove 64 a and the attachment of the connecting bracket 65 are such that the upper portions of the pair of left and right elbow struts 61 are inclined forward at the same angle in a side view. The relationship between the phase position and the inclination angle of the rib-like protrusion 52a is set.

  In the left and right projecting portions 51 of the base 6, the fitting protrusions 64 of the horizontal portion 63 are formed in the fitting recess 52 so that the pair of cutout grooves 64 a meshes with (engages with) the rib-like protrusions 52 a. The fittings 65 are overlapped from below in the fitted state. In this state, the fittings 65 are attached to the left and right projecting portions 51 by a total of three screws 66 (screws or bolts) screwed from below. It is fastened detachably. Female threaded portions 53 corresponding to the two insertion holes 67 formed in the upper overlapping portion 65a are formed by burring at a location where the upper overlapping portion 65a overlaps in the left and right projecting portions 51. Similarly, a female thread portion 53 corresponding to one insertion hole 67 formed in the lower overlapping portion 65b is also formed by burring at a portion of the left and right protruding portion 51 where the lower overlapping portion 65b overlaps. Of course, a nut may be welded or buried in place of the female screw portion 53.

  In order to attach the connecting metal fitting 64 to the left and right overhanging portion 51, the fitting fitting 64 of the horizontal portion 63 and the fitting recess 52 of the left and right overhanging portion 51 of the elbow strut 61 are fitted firmly from the left and right directions. The upper and lower overlapping portions 65a and 65b of the coupling metal 65 are overlapped with the lower surfaces of the left and right projecting portions while the rib-like protrusions 52a in the recess 52 are engaged with the pair of notched grooves 64a in the fitting convex portion 64. Then, the upper and lower overlapping portions 65a and 65b may be fastened to the left and right protruding portions 51 with three screws 66 from below (see FIG. 7B).

  In this case, since the fitting convex part 64 of the elbow support 61 and the fitting recess 52 of the left and right projecting part 51 fit tightly in the left and right direction with respect to each other, the armrest 4 is firmly attached by hand. Even if it is not lifted, there is little possibility that the fitting convex portion 64 will come out of the fitting recess 52 during attachment, and the attachment posture of the armrest 4 can be easily maintained. Even if the fitting between the fitting convex portion 64 and the fitting recess 52 is slightly loose, the operator keeps one hand on the armrest 4 until the first screw 66 is screwed in, The mounting posture of the armrest 4 can be maintained. Accordingly, the burden on the operator is reduced, and the armrest 4 can be attached efficiently.

  Moreover, the fitting convex portion 64 of the elbow post 61 and the fitting recess 52 of the left and right projecting portion 51 fit tightly in the left and right directions, so that even if a downward external force acts on the entire armrest 4, the fitting convex portion The fitting between the portion 64 and the fitting recess 52 is difficult to come off. Therefore, the attachment strength of the armrest 4 is significantly improved without impairing the ease of attachment.

  In the present embodiment, the elbow struts 61 of the armrest 4 are both inclined forward at the same angle in a side view, and therefore when the human elbow is placed on the elbow rest 62, the fitting convex portion 64 and the fitting concave portion 52 are provided. A moment that tilts the elbow strut forward and downward acts on the fitting position of the armrest 4. The forward tilting moment of the armrest 4 is such that the pair of the notch grooves 64 a and the rib-like protrusion 52 a mesh with each other. It can be received by (engagement), and the armrest 4 can be held in a predetermined mounting posture (forward tilt posture). That is, high support strength can be secured against the above-mentioned forward tilting moment by engaging the pair of notch grooves 64a with the rib-like protrusions 52a.

  Furthermore, although the fitting recess 52 has a large-diameter hole shape, it is shallow and not excessively recessed. Therefore, even when the armrest 4 is not attached, the user does not feel uncomfortable in terms of design. Therefore, even if the armrest 4 is not attached, it is possible to prevent a decrease in the beauty of the chair.

  In particular, in this embodiment, since the rib-like protrusion 52a is formed on the bottom surface of the fitting recess 52, the presence of the rib-like protrusion 52a can be recognized as a kind of design element. , Which contributes to the reduction of chair aesthetics.

  Further, the elbow support 61 is made of a metal round pipe, and the fitting convex portion 64 is a part of the elbow support 61 that penetrates the connecting metal fitting 65. Compared with the case where it manufactures by this, material cost and processing cost are low, and it becomes possible to reduce the manufacturing cost as the armrest 4 whole.

  By the way, the upper and lower overlapping portions 65a and 65b of the connecting metal fitting 65 are brought into contact with the left and right projecting portions 51 from below with the fitting convex portions 64 fitted in the fitting recesses 52, so that the armrests 4 are connected to the horizontal portions. Although it has a role as a means for holding and positioning around the axis of 63 so as not to rotate, it functions only as an auxiliary, and as in this embodiment, a pair of notch grooves 64a and ribs It is easier and more accurate to position by engaging (fitting) with the protrusion 52a.

  In the present embodiment, as the fitting means, a fitting recess may be formed on the lower end portion side of the elbow post 61 and a fitting convex portion may be formed on the left and right projecting portion 51. For example, the front end surface of the horizontal portion 63 is abutted and welded to the vertically long portion 65c of the connecting metal fitting 65, and a fitting recess is formed on the side surface of the vertically long portion 65c opposite to the abutting surface. Alternatively, left and right outward projecting fitting protrusions that fit into the fitting recesses on the connecting metal fitting 65 side from the left and right directions may be formed.

  When forming the fitting protrusions on the left and right projecting portions 51, if the fitting protrusions are not excessively protruded, the user will not feel uncomfortable even when the armrest 4 is not attached. , Can prevent a decrease in the aesthetics of the chair.

  The arrangement relationship between the notch groove 64a (engagement groove) and the rib-like protrusion 52a as the rotation prevention means of the armrest 4 is not limited to the above-described form, and either one is provided in the fitting recess and the other is fitted. What is necessary is just to provide in the joint convex part.

(3). Others The present invention is not limited to the above-described embodiment, and can be embodied in various forms. For example, the fitting means is not limited to the fitting between the fitting recess and the fitting convex portion, and a fitting structure between claws may be adopted. In this case, it is sufficient that one of the two engaging claws constituting the fitting means is elastically deformed. Of course, other engagement structures (locking structures) can also be employed.

  The arrangement of the fitting recess and the fitting convex portion as the fitting means can be arbitrarily set between the lower end portion of the elbow post and the elbow fixing portion in the armrest. That is, a fitting recess may be formed in one of the lower end portion of the elbow strut and the elbow fixing portion, and a fitting protrusion may be formed in the other.

  As an armrest rotation preventing means, a vertical groove extending in the fitting direction is formed in one of the fitting recess and the fitting convex, and a protrusion that fits in the vertical groove is formed on the other. A structure such as so-called spline fitting may be employed. Furthermore, the outer shape of the fitting projection is a non-circular shape such as a quadrangle or hexagon, and the fitting recess corresponding to the outer shape is also a non-circular inner diameter shape. Alternatively, a non-circular hole may be formed on the front end surface of the fitting convex portion, while a protrusion that fits in the hole so as not to rotate relative to the hole may be formed in the fitting recess.

  The entire elbow strut may be integrally formed of resin or the like. In this case, the connection fitting 65 as in the embodiment is not particularly necessary, and the fastening portion can be integrally formed.

  In addition, the configuration of each unit is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention.

It is a front view of the chair in this embodiment. (A) is a top view of a chair, (B) is a left view. It is a separation perspective view of a base. It is a vertical side view of a base. (A) is the perspective view which looked at the horizontal part of the elbow support from the upper part, (B) is the perspective view which looked at from the downward direction. (A) is the perspective view which looked at the base from back, (B) is a right view. (A) is a longitudinal front view in a state where an armrest is attached to the base, and (B) is a separated longitudinal front view showing an attachment relationship between the armrest and the base.

Explanation of symbols

2 Seat 3 Back 4 Armrest 6 Base 51 Overhanging portion 52 Lateral recess 52a Rib-shaped protrusion 61 Elbow post 63 Horizontal portion 64 Projecting portion 64a Notch groove 65 Connecting bracket 65a Upper overlapping portion 65b Lower overlapping portion 65c Vertically long portion

Claims (2)

A seat and an armrest on which an elbow of a person who sits is placed is supported from below by an elbow strut. A horizontal portion is provided at the lower end of the elbow strut, and the horizontal portion It is a chair that is provided with a fastening part that protrudes outside the part, and is fastened with screws by overlapping this fastening part on the elbow fixing part of another member,
The horizontal portion of the elbow strut and the elbow fixing portion are provided with fitting means that fit each other and hold the mounting posture of the armrest when the elbow strut is moved horizontally.
Chair. The elbow strut is made of a round pipe and rises vertically in front view on the left and right outer sides of the seat, and the horizontal portion at the lower end extends substantially in the left-right direction. As shown in the figure, a step-like connecting metal fitting having a horizontal upper overlapping portion and a lower overlapping portion and a vertically long portion connecting them is attached as the fastening portion, and the tip of the horizontal portion in the elbow strut The portion penetrates the vertically long portion of the connecting metal fitting and is a fitting convex portion as a part of the fitting means, and a notch groove is formed on the front end surface of the fitting convex portion. ,
A base fixed to the upper end of the leg support is disposed below the seat, and on the left and right sides of the base are elbow fixing portions where the upper overlapping portion and the lower overlapping portion of the coupling metal overlap from below. The elbow fixing portion is formed as a part of the fitting means so that a fitting recess into which the fitting convex portion of the elbow post fits is opened to the left and right, When the fitting convex portion is fitted into the fitting recess, the fitting concave portion engages with the notch groove of the fitting convex portion to hold the elbow strut so as not to rotate around the axis of the horizontal portion. Engaging protrusions are formed,
The chair according to claim 1.

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