chair

Abstract

To provide a chair which can apply a main leg body part useful for forming an excellent appearance and has excellent freedom of design that a leg frame part supported by the main leg body part can be excellently formed.SOLUTION: In a chair supporting a seat with leg bodies, a leg body A is provided with front legs Ef and rear legs Er to be a plurality of leg bodies and a base part D supported by the front legs Ef and the rear legs Er and disposed below the seat. The front legs Ef and the rear legs Er include: main leg body parts e1 extending vertically; and leg frame parts e2 which have inserted parts es extending vertically that are inserted only in upper parts of the main leg body parts e1 and are mediated between the main leg body parts e1 and the base part D.SELECTED DRAWING: Figure 12

Description

Technical Field

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[0001] The present invention relates to a chair.

Background Art

[0002] Conventionally, a chair in which a seat is supported by legs having a plurality of leg bodies is known (see, for example, Patent Document 1).

[0003] Recently, as part of realizing a sustainable society, in chairs used in offices and the like, it has begun to be considered to apply, for example, wooden ones to the leg bodies.

[0004] However, in this type of chair, a metal member serves as the main component of the leg body, and the wooden parts only serve as exterior materials.

[0005] In addition, the above situation is the same when applying something other than wood to the leg body.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] The present invention has been made paying attention to the above circumstances, and at least provides a chair excellent in the degree of freedom of design that can apply a main leg body part contributing to the formation of a suitable appearance and can preferably form a leg frame part supported by the main leg body part.

Means for Solving the Problems

[0008] That is, the present invention has the following configuration.

[0009] The invention described in claim 1 is a chair in which the seat is supported by a leg body, wherein the leg body comprises a plurality of leg bodies and a base supported by the plurality of leg bodies and disposed beneath the seat, wherein the leg body comprises a main leg body portion extending in the vertical direction and a leg frame portion interposed between the main leg body portion and the base portion, having a vertically extending insertable portion that is inserted only into the upper part of the main leg body portion. The insertable portion is fixed to the main body by a screw, and a screw insertion hole is provided in the upper part of the main body, extending in a direction substantially perpendicular to the main body. The insertable portion comprises a pipe-shaped portion made of a metal pipe material and provided with a screw insertion hole through which the screw is inserted, and a nut-mounting member disposed inside the pipe-shaped portion and provided with a nut portion into which the screw is screwed. It is a chair.

[0010] The invention described in claim 2 is the chair according to claim 1, wherein the main body is made of wood.

[0011] The invention described in claim 3 is the chair according to claim 1, wherein the main leg body is provided with a frame housing hole along the longitudinal direction of the main leg body into which the portion to be inserted is inserted.

[0012] The invention described in claim 4 is the chair according to claim 3, wherein the frame housing hole is set to a depth dimension shorter than half the longitudinal dimension of the main leg body.

[0014] Claim 5 The invention described herein is characterized in that a head-receiving recess is formed in the screw insertion hole, the head of which is to be accommodated. 1 This is the chair described.

[0016] Claim 6 The invention described herein is characterized in that the nut mounting member is plate-shaped overall, with a wider portion formed at its lower end, which is wider than the other parts, and a pair of notches are provided at the lower end of the pipe-shaped portion, which can engage with both ends of the wider portion. 1 This is the chair described.

[0017] Claim 7The invention described in is provided with a front leg, which is the leg body forming a pair on the left and right, and a rear leg, which is also the leg body forming a pair on the left and right. The main leg body portions constituting the front leg and the rear leg are formed in a substantially prismatic shape, and the inner surfaces of these main leg body portions are set to face the central portions in the front-rear direction and the left-right direction of the entire chair. The chair according to claim 1.

Effects of the Invention

[0018] As described above, according to the present invention, it is possible to provide a chair excellent in the degree of design freedom that can apply the main leg body portion contributing to the formation of a suitable appearance and can suitably form the leg frame portion supported by the main leg body portion.

Brief Description of the Drawings

[0019] [Figure 1] Perspective view showing an embodiment of the present invention. [Figure 2] Front view of the same embodiment. [Figure 3] Rear view of the same embodiment. [Figure 4] Right side view of the same embodiment. [Figure 5] Plan view of the same embodiment. [Figure 6] Bottom view of the same embodiment. [Figure 7] Perspective view of the same embodiment. [Figure 8] Cross-sectional view taken along line A-A in FIG. 2. [Figure 9] Partial enlarged view in FIG. 8. [Figure 10] Exploded perspective view of the same embodiment. [Figure 11] Exploded perspective view of the same embodiment. [Figure 12] Exploded perspective view of the same embodiment. [Figure 13] Exploded perspective view of the same embodiment. [Figure 14] Exploded perspective view of the same embodiment. [Figure 15] Exploded perspective view of the same embodiment. [Figure 16] An exploded perspective view of the same embodiment. [Figure 17] An exploded perspective view of the same embodiment. [Figure 18] An exploded perspective view of the same embodiment. [Figure 19] An exploded perspective view of the same embodiment. [Figure 20] An exploded perspective view of the same embodiment. [Figure 21] An exploded perspective view of the same embodiment. [Figure 22] An exploded perspective view of the same embodiment. [Figure 23] Front view of the cover body (unfolded) in the same embodiment. [Figure 24] Rear view of the cover body (unfolded state) in the same embodiment. [Figure 25] A perspective view of the seat shell in the same embodiment. [Figure 26] A bottom view of the seat shell in the same embodiment. [Figure 27] A bottom view of the seat inner shell (plate-shaped member) in the same embodiment. [Figure 28] A partially enlarged perspective view of the seat inner shell (plate-shaped member) in the same embodiment. [Figure 29] A partially enlarged perspective view of the seat inner shell (plate-shaped member) in the same embodiment. [Figure 30] A cross-sectional view illustrating the front structure of the seat in the same embodiment. [Figure 31] A cross-sectional view illustrating the rear structure of the seat in the same embodiment. [Figure 32] A perspective view showing another embodiment (a chair to which leg body X1 is applied). [Figure 33] A perspective view showing another embodiment (a chair to which leg body X2 is applied). [Figure 34] A perspective view showing another embodiment (a chair to which leg body X3 is applied). [Modes for carrying out the invention]

[0020] One embodiment of the present invention will be described below with reference to Figures 1 to 31.

[0021] The chair comprises a leg body A, a seat support structure C positioned above the leg body A and integrally comprising a seat 3, a backrest R, and armrests T, and a tilting unit B interposed between the leg body A and the seat support structure C.

[0022] The chair in this embodiment is configured to allow selection of one of several different types of legs, namely, a four-legged wooden leg type A (see Figures 1-8, etc.), a four-casterless metal frame type leg X1 (see Figure 32), a four-castered metal frame type leg X2 (see Figure 33), and a height-adjustable leg type leg X3 (see Figure 34).

[0023] Furthermore, a common tilting unit B, which has a configuration that allows it to be connected to multiple types of leg bodies A, X1, X2, and X3 by screws v2, is mounted on one of the selected leg bodies. In other words, the chair of this embodiment has a seat support structure C, which includes a seat 3, attached to the tilting unit B mounted on one of the selected leg bodies.

[0024] In this specification, we will describe in detail an embodiment in which four wooden leg-type leg bodies A are selected from among multiple types of leg bodies A, X1, X2, and X3 with different shapes.

[0025] <<Leg body A>> Leg body A comprises four leg bodies extending vertically: left and right forelegs Ef and left and right hind legs Er, and a base D supported by the left and right forelegs Ef and left and right hind legs Er.

[0026] <Forelegs Ef, hind legs Er> The front leg Ef and rear leg Er each consist of a wooden main sprocket body e1 extending in the vertical direction, and a leg frame e2 interposed between the main sprocket body e1 and the base D, having a vertically extending insertable portion es that is inserted only into the upper part of the main sprocket body e1.

[0027] Since the main leg body e1 and leg frame e2 that make up the front leg Ef and rear leg Er have the same structure, they will be described together below.

[0028] [Main script e1] The main leg body e1 is made of wood. The main leg body e1 has a frame housing hole e11 drilled along its longitudinal direction into which the insertion part es provided in the leg frame e2 is inserted.

[0029] The frame housing hole e11 is drilled downward from the upper end surface of the main body e1, along the axis of the main body e1. The frame housing hole e11 is bottomed and capable of accommodating the insertion portion es, which extends linearly in the vertical direction. The depth of the frame housing hole e11 is set to be less than half the total length of the longitudinal dimension of the main body e1.

[0030] A screw insertion hole h1 is provided in the upper inner portion of the main body e1, extending in a direction substantially perpendicular to the main body e1. A head-receiving recess h11 is formed in the screw insertion hole h1, in which the head of a screw v1 is accommodated.

[0031] A ground contact member L is provided at the lower end of the main sprocket body e1, which contacts the floor surface.

[0032] The main leg body e1 is formed in a roughly rectangular prism shape. The inward-facing surface em of the inner part of each main leg body e1, which is provided with a screw insertion hole h1, is set to face the center of the chair in both the front-to-back and left-to-right directions.

[0033] [Leg frame section e2] The leg frame section e2 constitutes the base ends of the front leg Ef and rear leg Er, which are the main components of the chair. The leg frame section e2 is mainly composed of metal pipes that extend in the vertical direction. The leg frame section e2 extends downwards, gradually moving away from the center of the chair.

[0034] In this embodiment, the leg frame portion e2 constituting the left front leg Ef and the leg frame portion e2 constituting the left rear leg Er are integrally connected via a left horizontal frame portion e3 extending in the front-rear direction. Similarly, the leg frame portion e2 constituting the right front leg Ef and the leg frame portion e2 constituting the right rear leg Er are integrally connected via a right horizontal frame portion e3 extending horizontally in the front-rear direction. The left and right horizontal frame portions e3 are arranged on both the left and right sides of the base body d1 in the base portion D.

[0035] The left and right horizontal frame sections e3 are rigidly connected to the base body d1 of the base D by welding. In other words, the leg body A has a frame material F which integrally comprises the front and rear leg frame sections e2 and the horizontal frame section e3 and is rigidly connected to the base body d1.

[0036] The insertion portion es, located at the lower part of the leg frame e2, is fixed to the main leg body e1 by a screw v1. The insertion portion es mainly consists of a pipe-shaped portion ea made of metal pipe material.

[0037] The part to be inserted es comprises a pipe-shaped part ea having a screw insertion hole hf through which a screw v1 is inserted, and a nut-mounting member eb disposed inside the pipe-shaped part ea and having a nut portion n1 to which the screw v1 is screwed.

[0038] The pipe-shaped portion ea is designed to allow the nut-mounting member eb to be inserted inside. The lower end of the pipe-shaped portion ea is provided with a pair of notches ec into which both ends of the wide portion ed of the nut-mounting member eb housed inside can engage.

[0039] The nut mounting member eb is made of metal and has an overall elongated plate shape. The nut mounting member eb is inserted into the pipe-shaped section ea from below. The nut mounting member eb has a wide section ed formed at its lower end, which is wider than the rest of the nut mounting member eb. The nut mounting member eb is positioned by being inserted into the pipe-shaped section ea and by the engagement of both ends of the wide section ed with the notches ec.

[0040] <Base D> The base D is supported by the left and right front legs Ef and the left and right rear legs Er, and is positioned beneath the seat 3.

[0041] The base D comprises a metal base body d1 having a horizontal plate-shaped portion d11 on which the tilting unit B is mounted, and a synthetic resin protective frame member d2 that is detachably attached to the base body d1 and surrounds the outer periphery of the tilting unit B.

[0042] [Base body d1] The base body d1 has a roughly rectangular horizontal plate-like portion d11 located in the center in the front-rear and left-right directions to which the first unit member 1 of the tilting unit B is attached, and upright wall portions d12 erected at the front and rear ends of the horizontal plate-like portion d11, with both left and right ends serving as positioning portions for the horizontal frame portion e3.

[0043] The horizontal plate-shaped portion d11 is provided with screw insertion holes h2 at multiple locations, through which screws v2 for screwing the first unit member 1 to the horizontal plate-shaped portion d11 are inserted from bottom to top.

[0044] Connecting pieces d13 are erected at both the left and right ends of the horizontal plate-shaped portion d11 for welding the frame material F having the leg frame portion e2. In addition, notched holes d14 are provided adjacent to the front and rear of the base end of the connecting piece d13, into which positioning projections dt protruding from the lower end of the curved wall portion d23 provided on the protective frame member d2 engage.

[0045] The left and right ends of the upright wall portion d12 are cut out in a roughly quarter-circle arc shape. The left and right ends of the upright wall portion d12 function as positioning points when the horizontal frame portion e3 is welded to the base body d1. In addition, the upper part of the upright wall portion d12 has multiple engagement holes d15 that penetrate in the front-to-back direction and engage with multiple engagement protrusions dk provided on the protective frame member d2, spaced at regular intervals in the left-to-right direction.

[0046] [Protective frame member d2] The protective frame member d2 is made of synthetic resin and is placed on the base body d1. The protective frame member d2 works in cooperation with the protective wall 32b provided on the seat shell body 32 to suppress the appearance of gaps that could cause problems such as finger pinching when the seated support structure C tilts.

[0047] The protective frame member d2 comprises a horizontal frame-shaped portion d21 provided in a flange shape so as to extend outward from the base body d1, and an upright peripheral wall portion d22 extending upward from the outer peripheral edge of the horizontal frame-shaped portion d21 so as to surround it on all four sides.

[0048] The horizontal frame-shaped portion d21 is roughly rectangular in shape. From the inner ends of the left and right frame components d24 of the horizontal frame-shaped portion d21, curved wall portions d23 extend outwards, gradually moving downward inwards. The left and right curved wall portions d23 are provided with a pair of front and rear positioning protrusions dt at their lower ends, which are the extended ends.

[0049] At the inner ends of the front and rear frame components d25 in the horizontal frame-shaped portion d21, engaging protrusions dk are provided at regular intervals in the left-right direction, engaging with the engaging holes d15 of the upright wall portion d12 of the base body d1.

[0050] <<Tilt Unit B>> The tilting unit B is interposed between the base D of the leg body A and the seat shell 32 of the seat 3.

[0051] In this embodiment, the tilting unit B supports the seated support structure C, which includes the seat 3, so that it can tilt forward and backward relative to the leg body A. In other words, the seated support structure C is supported by the leg body A via the tilting unit B.

[0052] The tilting unit B comprises a first unit member 1 fixed to the leg body A by a screw v2, and a second unit member 2 that is rotatably supported by the first unit member 1 and fixed to the seat 3 by a screw v3.

[0053] <First Unit Component 1> The first unit member 1, as a whole, has the shape of a rectangular box with an open top.

[0054] The first unit member 1 comprises a bottom wall portion 11 that is substantially rectangular in shape and has an elongated length in the front-to-back direction when viewed from the bottom, and lower peripheral wall portions 12, namely the front upright wall 12a, the rear upright wall 12b, and the left and right side upright walls 12c, which are erected on the periphery of the bottom wall portion 11.

[0055] [Bottom wall section 11] The bottom wall portion 11 has its lower surface in contact with the upper surface of the horizontal plate-shaped portion d11 at the base D of the leg body A.

[0056] Nut portions n2 are provided on the lower surfaces of the bottom wall portion 11 at two locations on the left and right sides of the front and two locations on the left and right sides of the rear, respectively, to which screws v2 for fastening to the base portion D are screwed.

[0057] Multiple annular or semi-annular first shaft holding portions 11a are provided on the upper surface of the central portion in the front-rear direction of the bottom wall portion 11 for holding the support shaft J that extends in the left-right direction.

[0058] Boss portions 11b are erected on the upper surfaces of the front and rear of the bottom wall portion 11, that is, in front of and behind the first shaft holding portion 11a, to engage with and position an elastic body S made of a cylindrical rubber material.

[0059] In other words, between the first and second unit members 1 and 2 in front of the support axis J, and between the first and second unit members 1 and 2 behind the support axis J, there is a front elastic body S capable of applying a biasing force to return the second unit member 2 from a forward-tilted position to its initial position (intermediate position), and a rear elastic body S capable of applying a biasing force to return the second unit member 2 from a backward-tilted position to its initial position (intermediate position).

[0060] [Lower peripheral wall portion 12] Rubber damper members 13 are provided at the four corners of the lower peripheral wall portion 12. The damper members 13 can perform a predetermined cushioning function when they come into contact with the lower surface of the top wall portion 21 of the second unit member 2 when the seat 3 is tilted.

[0061] <Second Unit Component 2> The second unit member 2 is supported so as to be rotatable in the front-rear direction relative to the first unit member 1 via a support shaft J that extends in the left-right direction.

[0062] The second unit member 2 comprises a top wall portion 21 that is substantially rectangular in plan view, and upper peripheral wall portions 22 that are suspended from the top wall portion 21, namely the front hanging wall 22a, the rear hanging wall 22b, and the left and right side hanging walls 22c.

[0063] [Top wall section 21] The top wall portion 21 has its upper surface in contact with the lower surface of the seat shell body 32. The top wall portion 21 is installed in the tilting unit mounting portion 32a provided on the seat shell body 32.

[0064] The top wall portion 21 is provided with left and right extension portions 21b that protrude outward in a flange-like manner from the left and right side hanging walls 22c of the upper peripheral wall portion 22. Multiple screw insertion holes h3 are provided vertically through both the left and right sides of the top wall portion 21, i.e., the left and right extension portions 21b, through which multiple screws v3 for screwing into the seat shell body 32 of the seat 3 are inserted. In other words, the second unit member 2 constituting the tilting unit B is fixed to the seat shell body 32 having a nut portion n3 by screws v3.

[0065] A second shaft holding portion 21a, which forms an annular shape, is provided on the lower surface side of the central part of the top wall portion 21 in the front-rear and left-right directions, for holding the support shaft J.

[0066] [Lower peripheral wall portion 12] The left and right side hanging walls 22c of the lower peripheral wall portion 12 are provided with shaft holding holes 22d that penetrate in the left-right direction for holding the support shaft J. The shaft holding holes 22d are located in the center in the front-rear direction of the left and right side hanging walls 22c. The tip (right end) of the support shaft J is supported by the shaft holding hole 22d provided in the right side hanging wall 22c via a bearing member jb.

[0067] <<Seated Person Support Structure C>> The seated support structure C comprises a seat 3 with its upper surface as a seating surface, a backrest R erected at the rear of the seat 3, and left and right armrests T erected on both sides of the seat 3.

[0068] The seated support structure C includes a synthetic shell body U which is integrally formed from a seat shell body 32 formed in a shell shape from synthetic resin and constituting the seat 3, and a support shell body G which has a backrest body 4 formed in a shell shape from synthetic resin and an armrest body 5 formed in an armrest T.

[0069] The seated support structure C in this embodiment comprises a seat 3 having a seat shell 32 connected to a tilting unit B, a support shell G formed in a shell shape from synthetic resin and attached to the seat shell 32, and a cover K covering the support shell G.

[0070] <Location 3> The seat 3 comprises a seat body 31 having a seating surface and a seat shell 32 attached to the lower surface of the seat body 31.

[0071] [Seat body 31] The seat body 31 comprises a seat cushion I having cushioning properties, seat upholstery H covering the upper and outer periphery of the seat cushion I, and a seat inner shell Q, which is a plate-shaped member attached below the seat cushion I.

[0072] The seat cushion I is primarily made of polyurethane foam, a type of foamed material. A plate-shaped inner seat shell Q is attached to the underside of the seat cushion I.

[0073] The seat cushion I is shaped to fit onto the seat inner shell Q from above. The peripheral edge of the seat cushion I is provided with a vertical portion is which has an inner surface that can be attached to the outer surface of the support wall q12 provided on the seat inner shell Q. The vertical portion is is a part that hangs downward on the peripheral edge of the seat cushion I. The lower end of the vertical portion is on the seat cushion I is shaped to be directly below the lower end qe of the support wall q12 on the seat inner shell Q.

[0074] The seat upholstery H constitutes the surface layer of the seat 3. The seat upholstery H is mainly composed of a fabric with a foamed sheet material attached to its inner surface. The seat upholstery H covers the upper part and outer periphery of the seat cushion I and the peripheral edges of the seat inner shell Q. The seat upholstery H is in the shape of a bag that is open downwards.

[0075] The edge he of the upholstery fabric H is roughly annular. The edge he of the upholstery fabric H is designed to be narrowed in diameter in a drawstring shape by a string-like member (not shown). By being narrowed by the string-like member, the edge he of the upholstery fabric H is positioned to be attached to or close to the outward surface sm of the upright wall portion q11.

[0076] The edge he of the seat upholstery H can be moored to the first and second mooring sections q2 and q3, which are mooring sections provided near the periphery of the seat inner shell Q.

[0077] The seat inner shell Q is formed in a shell shape from synthetic resin. The seat inner shell Q supports the seat cushion I. The seat inner shell Q constitutes the lowest part of the seat body 31. The seat inner shell Q is attached to the upper surface of the seat shell body 32.

[0078] The inner seat shell Q is provided with multiple nut portions n6. The inner seat shell Q is attached to the seat shell body 32 by screwing screws v6, which are inserted through screw insertion holes h6 provided in the peripheral edge portion 32c of the seat shell body 32, into the nut portions n6.

[0079] The seat inner shell Q has a seat cushion I mounted on its upper surface. The seat inner shell Q comprises a seat inner shell body q1 and first and second mooring parts q2 and q3, which are mooring parts provided near the periphery of the seat inner shell body q1.

[0080] The seat inner shell body q1 constitutes the main part of the seat inner shell Q, which is interposed between the seat shell body 32 and the seat cushion I.

[0081] The seat inner shell body q1 includes a top wall portion q10 that forms a base, a support wall q12 that hangs downward from the outer edge of the top wall portion q10 and is attached to the inner surface of a vertical portion is formed on its outer surface, which is made of the seat cushion I, and an upright wall portion q11 that is positioned inside the support wall q12, i.e., towards the central part of the seat inner shell body q1, and extends in the vertical direction. The edge he of the seat upholstery H is accommodated between the support wall q12 and the upright wall portion q11 that hang downward from the top wall portion q10.

[0082] The first and second mooring sections q2 and q3 are for securing the edge he of the seat upholstery H to the periphery of the seat inner shell body q1. The first and second mooring sections q2 and q3 are provided on the outward-facing sm side of the upright wall section q11 provided on the seat inner shell Q. That is, the first and second mooring sections q2 and q3 are arranged between the support wall q12 and the upright wall section q11 that constitute the seat inner shell body q1.

[0083] The first mooring sections q2 are located at two locations on the left and right sides of the front of the seat inner shell Q, and at two locations on the left and right sides of the rear of the seat inner shell Q.

[0084] The second mooring section q3 is located at the four corners of the seat inner shell Q, and at the center in the front-to-back direction of both the left and right edges.

[0085] The first mooring section q2 comprises a base extension section q21 that cantileveredly extends from the upright wall section q11 of the seat inner shell body q1, and a tip extension section q22 that is continuous with the tip of the base extension section q21 and extends toward the central part of the seat inner shell Q.

[0086] The base extension portion q21 comprises an outwardly extending portion qa extending outward from the lower end of the upright wall portion q11, and an upwardly extending portion qb extending upward from the tip of the outwardly extending portion qa, substantially perpendicular to the outwardly extending portion qa.

[0087] The tip extension portion q22 is provided at the upper end, which is the tip of the upward extension portion qb, and extends substantially horizontally in a direction substantially perpendicular to the upward extension portion qb.

[0088] The tip extension q22 is a roughly triangular projection that is configured to gradually narrow from the base to the tip. The tip extension q22 is positioned above the lower end qe of the support wall q12 provided on the seat inner shell Q.

[0089] The tip extension q22 is configured to tightly engage with the edge he of the upholstery H when the reduced diameter state of the edge he loosens. The reduced diameter state of the edge he of the upholstery H refers to the normal mounting state in which the edge he is tightened by the string-like member and fixed in a position attached to or close to the outward surface sm of the upright wall q11.

[0090] A reinforcing rib qr is provided between the seat inner shell body q1 and the first mooring portion q2, that is, between the outward-facing surface sm of the upright wall portion q11 and the outward-extending portion qa of the base end extension portion q21.

[0091] [Seat shell body 32] The seat shell 32 supports the seat body 31. The seat shell 32 is separate from the support shell G. The seat shell 32 is supported by the tilting unit B.

[0092] The seat shell 32 is attached to the underside of the seat cushion Q so as to cover the edge he of the seat upholstery H, which is secured near the peripheral edge of the seat inner shell Q.

[0093] The seat shell 32 comprises a tilting unit mounting section 32a provided on the lower surface side of the central part in the front-rear and left-right directions, a protective wall 32b provided so as to surround the outside of the tilting unit mounting section 32a via a groove-shaped gap sk, and a peripheral edge 32c provided on the outside of the protective wall 32b.

[0094] The second unit member 2 of the tilting unit B is disposed in the tilting unit arrangement section 32a. The tilting unit arrangement section 32a as a whole has an upward recessed shape. The tilting unit arrangement section 32a is provided with a nut portion n3 into which a screw v3 inserted through the screw insertion hole h3 of the second unit member 2 is screwed. In addition, a positioning protrusion 32d is formed in the tilting unit arrangement section 32a so as to engage with the peripheral edge of the top wall portion 21 of the second unit member 2.

[0095] The protective wall 32b can cover the upper peripheral edge of the base D. The protective wall 32b is positioned outside the upright peripheral wall portion d22 of the protective peripheral wall portion d2 at the base D. The protective wall 32b works in cooperation with the protective peripheral wall portion d2 to prevent a gap from being exposed between the seated support structure C and the base D when the seated support structure C, including the seat 3, is tilted. The upright peripheral wall portion d22 of the protective frame member d2 that constitutes the base D is positioned in the groove-shaped gap sk between the tilting unit mounting portion 32a and the protective wall 32b.

[0096] The peripheral edge 32c has portions to which the rear mounting portion tr and the side mounting portion ts of the support shell G are attached. The rear mounting portion tr and the side mounting portion ts of the support shell G are screwed to the seat shell 32 in such a manner that they are in contact with the lower surface of the peripheral edge 32c.

[0097] A nut portion n4 is provided at the rear edge of the peripheral portion 32c, to which a screw v4 inserted through the screw insertion hole h4 of the rear mounting portion tr is screwed. Nut portions n5 are provided at the left and right side edges of the peripheral portion 32c, to which a screw v5 inserted through the screw insertion hole h5 of the side mounting portion ts is screwed.

[0098] Furthermore, the peripheral portion 32c is provided with a screw insertion hole h6 through which a screw v6 is inserted for screwing into a nut portion n6 provided on the inner shell Q.

[0099] <Support shell G> The support shell G is a single molded synthetic resin product erected on the periphery of the seat 3.

[0100] The support shell G comprises a backrest body 4 mainly composed of upright wall-like portions, armrest body 5 mainly composed of upright wall-like portions that extend integrally forward from both the left and right sides of the backrest body 4 and whose upper ends form the armrest portion 51 for the seated person, a rear mounting portion tr that extends forward from the lower end of the backrest body 4 and is attached to the lower surface of the seat shell 32, and side mounting portions ts that extend inward from the lower ends of the left and right armrest body portions 5 and are attached to the lower surface of the seat shell 32. These backrest body 4, left and right armrest body portions 5, rear mounting portion tr, and side mounting portions ts are integrally formed from synthetic resin.

[0101] [Backrest main body 4] The backrest body 4 is a shell-shaped component that forms the backrest R. The backrest body 4 is mainly composed of upright wall-like portions that extend in the vertical and horizontal directions. In a plan view, the backrest body 4 has a curved shape that convex towards the rear. In addition, the upper edge of the backrest body 4 is gently curved so that, in a front view, it gradually moves downward from the center in the horizontal direction outwards.

[0102] The upper end of the backrest body 4 is positioned above the upper ends of the left and right armrest body 5.

[0103] [Left and right armrest main body parts 5] The left and right armrest bodies 5 are shell-shaped components that make up the left and right armrests T. The left and right armrest bodies 5 are mainly composed of upright wall-like portions that extend in the vertical and front-to-back directions. The left armrest body 5 and the right armrest body 5 are provided symmetrically.

[0104] The left and right armrest bodies 5 are provided with armrest portions 51 at their upper ends, which function as elbow rests for the seated person. The armrest portions 51 are inclined so as to be gradually positioned downward toward the front when viewed from the side.

[0105] The lower parts of the left and right armrest bodies 5 are provided with through holes 52 that extend through in the left-right direction. The through holes 52 are elongated holes that are horizontally oriented.

[0106] The left and right through holes 52 are provided for attaching the cover body K to the support shell body G. The left and right connecting pieces 7 provided on the cover body K, which covers the upper part of the support shell body G, are inserted through the through holes 52.

[0107] [Rear mounting part tr] The rear mounting section tr is a shell-shaped structure that extends forward from the lower end of the backrest body 4. Screw insertion holes h4 are provided at two locations on the left and right sides of the rear mounting section tr, through which screws v4 for connecting to the seat shell 32 are inserted.

[0108] [Side mounting part ts] The side mounting portion ts is a shell-shaped structure extending inward from the lower end of the armrest body portion 5. The left and right side mounting portions ts are not connected to the rear mounting portion tr, and are positioned at a distance forward from the rear mounting portion tr. The left and right side mounting portions ts are provided with screw insertion holes h5 through which screws v5 for connecting to the seat shell body 32 are inserted.

[0109] Positioning projections tp are provided on the rear of the left and right side mounting portions ts, extending inward and engaging with the notched portion 32e of the protective wall 32b.

[0110] <Cover Body K> The cover body K covers the support shell body G that constitutes the seated support structure C. The cover body K is a sewn product made of fabric. The cover body K is mainly composed of fabric with a foam sheet material attached to its inner surface.

[0111] The cover body K is bag-shaped and open downwards. The cover body K comprises a cover body 6 that covers the backrest body 4 and the armrest body 5, left and right connecting piece-shaped parts 7 that are connected to the cover body 6 and are inserted through through holes 52 provided in both the left and right armrest body 5, with the inserted ends being fastened to the outer surface of the cover body 6, and a seat connecting piece-shaped part 8 that is connected to the cover body 6 and is fastened to the rear end of the seat 3.

[0112] [Cover body part 6] The cover body 6 comprises an inner covering portion 61 that covers the inner surface of the support shell G and an outer covering portion 62 that covers the outer surface of the support shell G.

[0113] The cover body 6 is configured such that the boundary portion where the inner covering portion 61 and the outer covering portion 62 are continuous, that is, the boundary portion where the inner covering portion 61 and the outer covering portion 62 are connected, follows the edge of the support shell body G.

[0114] On the outer surface of the outer covering portion 62, which is positioned to correspond to the main body portion 5 of the armrest, the other snap button element p2 is provided, which constitutes a snap button P from which the left and right connecting piece-shaped portions 7 can be attached and detached.

[0115] The lower edge 6e of the cover body 6 is set to extend approximately horizontally. Below the lower edge 6e of the cover body 6, the lower parts of the backrest body 4 and the armrest body 5, which are not covered by the cover body 6, are exposed to the outside.

[0116] [Left and right connecting piece-like parts 7] The left and right connecting pieces 7 are connected to the portions of the cover body 6 that cover the inner surfaces of the left and right armrest body portions 5.

[0117] The left and right connecting pieces 7 are connected to the lower ends of the inner covering portion 61. The left and right connecting pieces 7 are configured to be detachably attached to the outer surface of the outer covering portion 62 by snap buttons P, which are fastening means.

[0118] In other words, one snap button element p1 constituting the snap button P is provided on the left and right connecting piece-shaped parts 7, and the other snap button element p2 to which the other snap button element p1 can be fastened is provided on the outer surface of the outer covering part 62 of the cover body part 6.

[0119] [Seat connecting piece 8] The seat connecting piece 8 is connected to the lower end of the portion of the cover body 6 that covers the inner surface of the backrest body 4.

[0120] The seat connecting piece 8 is connected to the lower end of the inner surface covering portion 61. The seat connecting piece 8 is configured to be detachably attached to the back surface of the seat body 31, which is the rear end of the seat 3, by a hook-and-loop fastener M, which is a fastening means.

[0121] In other words, one hook fastener element m1 constituting the hook fastener M is provided on the seat connecting piece 8, and the other hook fastener element m2 to which the other hook fastener element m1 can be fastened is provided on the back surface of the seat body 31.

[0122] <<Regarding the configuration that allows for flexible setting of leg variations>> The chair in this embodiment is configured to allow selection of one leg from a plurality of different types of legs, namely, four wooden leg type legs A (see Figures 1-8, etc.), four metal frame type legs X1 without casters (see Figure 32), four metal frame type legs with casters X2 (see Figure 33), and height-adjustable leg type legs X3 (see Figure 34).

[0123] Figure 32 shows four caster-less metal frame type legs X1. Each leg X1 comprises a metal frame base E without casters at its lower end, and a base D supported by the base E. The base D of the leg X1 shown in Figure 32 has the same structure as the base D of the four wooden leg type legs A described in detail earlier.

[0124] Figure 33 shows four caster-equipped metal frame type legs X2. Each leg X2 comprises a metal frame base E with casters c at its lower end, and a base D supported by the base E. The base D of the leg X2 shown in Figure 33 has the same structure as the base D of the four wooden leg type legs A described in detail earlier.

[0125] Figure 34 shows a lifting leg type leg body X3. The leg body E of the leg body X3 comprises a plurality of leg vanes xa with casters c at their tips, and a leg support column xb that extends vertically and to which the base ends of the leg vanes xa are connected. The leg support column xb of the leg body X3 comprises a leg support column base xb1 located at the bottom, and a leg support column cylinder xb2 that is supported so as to be vertically movable relative to the leg support column base xb1. The base D of the leg body X3 has a fitting hole xc into which the upper end of the cylinder member xb2 can be tapered fitted, and a plurality of screw insertion holes xd that penetrate vertically, and is connected to the lower surface of the bottom wall portion 11 of the tilting unit B.

[0126] In this embodiment, the chair is designed so that a tilting unit B of a common specification can be attached to a selected leg. The seat support structure C, which includes the seat 3, is then supported by the tilting unit B of the common specification. As a result, a configuration is achieved that allows for flexible configuration of variations in the leg.

[0127] In the chair of the embodiment described above, the legs (legs A, legs X1, legs X2, legs X3) and the seat 3 are connected via a tilting unit B, and the first unit member 1 of the tilting unit B is fixed to the legs by a screw v2. Therefore, in a chair having a seat 3 that can tilt relative to leg A, it is possible to provide a configuration with excellent design freedom that allows for flexible setting of variations in the legs, that is, a configuration that makes it easy to deploy various legs.

[0128] Furthermore, in the chair of the embodiment described above, the cover body K is equipped with left and right connecting piece-shaped parts 7 that are inserted through through holes 52 provided on the left and right sides of the support shell body G, so that the backrest body 4 and the left and right armrest body 5 provided on the support shell body G can be suitably covered by the cover body K.

[0129] Furthermore, the chair according to the above-described embodiment offers excellent design flexibility, as it allows for the application of a wooden main leg body e1 that contributes to the formation of a suitable appearance, and also allows for the suitability of the leg frame e2 supported by the main leg body e1.

[0130] Furthermore, in the embodiment described above, the seat shell 32 is constructed separately from the support shell G and connected to the support shell G using screws, which are fasteners. Therefore, it offers excellent design flexibility, allowing for the flexible formation of the shell that forms the basic structure of the seat support structure C, i.e., the connecting structure between the seat shell 32 and the support shell G.

[0131] As described above, the chair according to this embodiment has a seat support structure C, which includes a seat 3, supported by legs A. The legs A comprises a plurality of legs, namely four legs, which are front legs Ef and rear legs Er, and a base D that is supported by the front legs Ef and rear legs Er and disposed beneath the seat 3.

[0132] The front leg Ef and rear leg Er each consist of a wooden main leg body e1 extending in the vertical direction, and a leg frame e2 interposed between the main leg body e1 and the base D, having a vertically extending insertable portion es that is inserted only into the upper part of the main leg body e1.

[0133] Therefore, it is possible to provide a chair with excellent design freedom, which allows for the application of a wooden main body e1 that contributes to the formation of a desirable appearance, and also allows for the suitability of forming the leg frame e2 supported by the main body e1.

[0134] A frame housing hole e11 is drilled in the wooden main body e1, along the longitudinal direction of the main body e1, into which the insertion part es is inserted.

[0135] Therefore, by inserting the portion es of the leg frame e2 into the frame housing hole e11 provided in the wooden main leg body e1, the main leg body e1 can suitably support the leg frame e2.

[0136] The frame housing hole e11 is set to a depth less than half the longitudinal dimension of the main screen body e1.

[0137] Therefore, a configuration in which the main leg section e1 forms the main parts of the forelegs Ef and hind legs Er can be suitably adopted.

[0138] The part to be inserted es is fixed to the main body e1 by a screw v1, and a screw insertion hole h1 is provided in the upper part of the main body e1, extending in a direction substantially perpendicular to the main body e1.

[0139] Therefore, the main body e1 is designed to suitably hold the insertion portion es by the screw v1.

[0140] A head-receiving recess h11 is formed in the screw insertion hole h1, in which the head of the screw v1 is accommodated.

[0141] Therefore, the head of the screw v1 is less visible from the main screen body e1, and the aesthetic appearance of the wooden legs is favorably maintained.

[0142] The insertion portion es comprises a pipe-shaped portion ea made of a metal pipe material and provided with a screw insertion hole he through which a screw v1 is inserted, and a nut-distributing member eb disposed inside the pipe-shaped portion ea and provided with a nut portion n1 to which the screw v1 is screwed.

[0143] Therefore, the part to be inserted, es, is equipped with a suitable configuration for screwing in the screw v1.

[0144] The nut mounting member eb is plate-shaped overall, with a wider section ed formed at its lower end, which is wider than the other parts. The lower end of the pipe-shaped section ea is provided with a pair of notches ec into which both ends of the wider section ed can engage.

[0145] Therefore, the nut mounting member eb is positioned appropriately with respect to the pipe-shaped portion ea.

[0146] A grounding member L is provided at the lower end of the main wing body e1.

[0147] Therefore, the main unit e1 can be stably positioned on the floor surface.

[0148] The leg body A comprises a front leg Ef, which is a pair of leg bodies on the left and right, and a rear leg Er, which is a pair of leg bodies on the left and right. The main leg body parts e1 that make up the front leg Ef and the rear leg Er are formed in a roughly rectangular prism shape, and the inner surfaces of each of these main leg body parts e1 are set to face the central part in the front-to-back and left-to-right directions of the entire chair.

[0149] Therefore, the main wing body e1 has a shape and orientation that is aesthetically pleasing and suitable.

[0150] However, the present invention is not limited to the embodiments described in detail above.

[0151] The chair can be any chair whose seat is supported by legs, and is not limited to those shown in the embodiments described above.

[0152] The leg structure can consist of multiple script bodies and a base supported by these script bodies and positioned beneath the seat.

[0153] For example, multiple scripts may consist of three parts, or they may consist of four or more parts.

[0154] For example, the base can have any configuration as long as it is positioned beneath the seat.

[0155] The main screen body is not limited to being made of wood.

[0156] The main screen unit can be configured in various ways without departing from the spirit of the present invention.

[0157] For example, the main screen body may be cylindrical or polygonal.

[0158] The frame housing hole may be set to be longer than half the longitudinal dimension of the main screen body.

[0159] The screw insertion holes provided in the main body may be located on the outer surface, which is easily visible to the user or other observers.

[0160] The part to be inserted may consist solely of a metal pipe material with a nut portion.

[0161] The grounding member provided at the lower end of the main body can be of various types.

[0162] Furthermore, the specific configuration of each part is not limited to the above embodiments, and various modifications are possible without departing from the spirit of the present invention. [Explanation of Symbols]

[0163] A...Leg body B...Tilting unit C... Seating support structure D...Base Ef·Er… Forelegs·Hintest legs (script form) e1…Main script body part e2... Leg frame section K...cover body Q...Support shell 1...First unit component 2…Second unit component 3…za 4...Backrest main body 5…Armrest main body 6…Cover body 7…Connecting piece

Claims

1. A chair in which the seat is supported by legs, The leg assembly comprises a plurality of screen bodies and a base supported by these plurality of screen bodies and disposed beneath the seat. The aforementioned screen body comprises a main screen body portion extending in the vertical direction, and a leg frame portion interposed between the main screen body portion and the base portion, having an insertion portion extending in the vertical direction that is inserted only into the upper part of the main screen body portion. The portion to be inserted is fixed to the main body by screws, The upper part of the main sprocket body is provided with a screw insertion hole that extends in a direction substantially perpendicular to the main sprocket body, The chair comprises a pipe-shaped portion made of a metal pipe material and provided with a screw insertion hole through which the screw is inserted, and a nut-mounting member disposed inside the pipe-shaped portion and provided with a nut portion to which the screw is screwed.

2. The chair according to claim 1, wherein the main body is made of wood.

3. The chair according to claim 1, wherein the main body of the chair is provided with a frame housing hole along the longitudinal direction of the main body of the chair into which the portion to be inserted is inserted.

4. The chair according to claim 3, wherein the frame housing hole is set to a depth less than half the longitudinal dimension of the main body.

5. The chair according to claim 1, wherein a head-receiving recess for accommodating the head of the screw is formed in the screw insertion hole.

6. The nut mounting member is plate-shaped overall, and has a wider portion formed at its lower end, which is wider than other parts. The chair according to claim 1, wherein a pair of notches are provided at the lower end of the pipe-shaped portion, into which the ends on both sides of the wide portion can engage.

7. The aforementioned leg body comprises a pair of front legs, which are the script body, and a pair of rear legs, which are the script body, which are the script body, The chair according to claim 1, wherein the main leg body portion constituting the front leg and the rear leg is formed in a substantially rectangular prism shape, and the inner surface of each of these main leg body portions is set to face the central portion in the front-to-back and left-to-right directions of the entire chair.

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