JP5021931B2 - Chair - Google Patents

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 described in Patent Document 2 related to the prior application is an elbow fixing provided on the left and right side portions of the base supported by the leg struts, with the connection fitting provided on the horizontal portion of the elbow strut in the armrest. In a chair that is overlapped with a part and fastened with a screw, the engaging part that overlaps the upper surface of the elbow fixing part is used as an engagement means for holding the armrest in the same posture 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.

The invention of claim 1, which is made to solve this technical problem, comprises a seat and an armrest, and the armrest is made of an elbow rest on which an elbow of a seated person rests and a round pipe that supports the arm rest from below . and a armrest support of, the horizontal-like portion provided at the lower end of the armrest support, and fastened by said concluded portion provided in a horizontal-like portion superimposed on the elbow fixed portions of the other member screw The connecting bracket that the horizontal portion penetrates is attached to the horizontal portion of the elbow strut, the connecting bracket is formed as the fastening portion, and this is fixed to the elbow fixing portion with a screw. And the front end of the horizontal portion of the elbow post is a fitting projection protruding from the coupling fitting, while the fitting projection of the elbow post is fitted into the elbow fixing portion. The recess is formed so as to open to the left and right outward, and the front end surface of the fitting convex portion and the fitting A notch groove is formed on one of the inside and the other side, and an engaging projection for fitting the notched groove is formed on the other. The fitting projection fits in the fitting recess and the notch. By fitting the notch groove and the engaging projection, the posture is maintained when the armrest is attached.

The invention according to claim 2, in the chair according to claim 1, wherein the connecting fitting is mounted in front view stepped connecting fitting having an upper overlapping portion and a lower overlapping portion of the water Tairajo an elongated portion connecting these are is in contact is, horizontal-like portion of the armrest support in the longitudinal portion and extends through, and the upper overlapping portion and the lower overlapping portion is fastened with screws to the elbow fixed part.

According to the invention of the present application , when the armrest is moved horizontally by the fitting convex part provided in the horizontal part of the elbow post and the fitting concave part provided in the elbow fixing part, the fitting that fits each other and maintains its mounting posture since means are constituted, without lifting firmly by hand armrest, it can hold the attachment posture of the elbow hook. I follow, is reducing the burden on the operator, it can be performed better efficiency of the mounting work of the armrest.

Moreover, since the fitting means composed of the fitting convex portion and the fitting concave portion fits each other when the elbow strut is moved horizontally, even if a downward external force acts on the entire armrest, the fitting convex portion The fitting with the fitting recess 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.

Further, in the present invention, when fitted to the fitting projection and the fitting recess in the lateral direction, by the engagement between the Switching Operation-away groove and engaging projection, a connecting fitting which is attached to the water Tairajo portion elbow since it set in the correct position relative to the fixed part, it allows better efficiency of mounting operation of the elbow hook.

Also, the armrest support is made of round pipe, fitting since convex portion is obtained by utilizing a portion protruding through the armrest support sac Chi consolidated metal, cheaper material cost and processing cost, elbows 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.

Base 6 of this embodiment is a shaped article of metal or resin, such as aluminum die cast product (of course, may be a sheet metal product.). 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). Armrests and then its mounting structure, with reference to FIGS. 1, 2 and 5-7, to explain the armrest and its mounting structure.

  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. This tip portion of the horizontal-like portion 63, and a fastening portion of claim, connecting fitting 65 made of metal plate is fixed 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. Portion protruding from the elongated portion 65c of the connecting fitting 65 of the horizontal-like portion 63 is adapted to fitting projection 64 as part of the fitting means. 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).

The armrest 4 is fixed to the base 6. Therefore, the elbow fixing portion described in the claims is formed on the base 6. As shown in FIGS. 2 (B), 4 and 6, the upper and lower overlapping portions 65a and 65b of the coupling metal 65 are overlapped from below on the left and right rear portions of the base 6. overhang 51 of, are integrally formed so as to protrude to the left and right outward, to the right and left projecting portions 51 as part of the fitting means, the fitting recess 52 which is open to the left and right outward is formed ing.

Mating recess 52 is for fitting convex portion 64 of the horizontal-like portion 63 is formed in and shallow with tightly fitting that round hole shape, the bottom surface of the fitting recess 52, horizontal fitting convex portion 6 4 of a pair of notched grooves 64a and engage a side view a non-circular rib-shaped engaging projection 52 a at Jo portion 63 is formed so as to protrude to the left and right outward.

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 engaging 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. Therefore, the pair of cutout grooves 64 a of the fitting convex portion 64 in the horizontal portion 63 and the engaging 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 engaging 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 engaging protrusions 52 a. The fittings 65 are overlapped from below in the fitted state, and in this state, the upper and lower overlapping portions 65a and 65b of the coupling fitting 65 are attached to a total of three screws 66 (screws or bolts) screwed from below. The left and right projecting portions 51 are detachably fastened. 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 65 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 into each other from the left and right directions. The upper and lower overlapping portions 65a and 65b of the connecting metal fitting 65 are overlapped with the lower surfaces of the left and right overhanging portions while engaging the pair of notched grooves 64a in the fitting convex portion 64 with the engaging protrusions 52a in the recess 52. 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 maintained .

  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 engagement 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 against the above-mentioned forward tilting moment can be ensured by the engagement between the pair of notch grooves 64a and the engaging protrusion 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 the present embodiment, since the engagement protrusion 52a is formed on the bottom surface of the fitting recess 52, the presence of the engagement 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 Ru 63 about the axis in lifting the role you positioned non-rotatably held Ttei, this is only to function as an auxiliary, as in the present embodiment, a pair of notches grooves 64a and Positioning by engaging (fitting) with the engaging protrusion 52a is more simple and accurate, and is preferable.

The arrangement relationship between the notch groove 64a (engagement groove) and the engagement 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.

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.

2 seat 3 backrest 4 armrests 6 base 51 overhang 52 sideways recess 52a engaging protrusion 61 armrest support 63 horizontal-like portion 64 fitting projection 64a cutout groove 65 engagement portion in which the connecting fitting 65a on the polymerization unit 65b under polymerization unit 65c Longitudinal part

Claims (2)

The armrest is provided with an elbow rest on which a person's elbow is seated and an elbow post made of a round pipe that supports the armrest from below. A horizontal shape is provided at the lower end of the elbow strut. the section provided, a configuration having concluded with screws by superposing concluded portion provided in the horizontal-like portion in the elbow fixed portion of the other member,
A connecting bracket through which the horizontal portion penetrates is attached to the horizontal portion of the elbow strut, the connecting bracket is formed as the fastening portion, and this is fixed to the elbow fixing portion with a screw. On the other hand, the tip of the horizontal part is a fitting convex part protruding from the connecting bracket,
The elbow fixing portion is formed so that a fitting recess into which the fitting convex portion of the elbow post is fitted opens leftward and rightward, and the front end surface of the fitting convex portion and the fitting concave portion A notch groove is formed in one of the two and an engaging projection into which the notched groove is fitted is formed on the other, and the fitting projection is fitted in the fitting recess and the notch By fitting the groove and the engagement protrusion, the posture is maintained when the armrest is attached.
Chair. The connecting fitting is a front view stepped connecting fitting having an upper overlapping portion and a lower overlapping portion of the water Tairajo an elongated section connecting these Ri Contact is attached, horizontal-like portion of the armrest support to said longitudinal portion And the upper overlapping portion and the lower overlapping portion are fastened with screws to the elbow fixing portion,
The chair according to claim 1.

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