Chair

Abstract

In a chair according to the present invention, a backrest connecting a backrest frame and a backrest post comprises: a coupling member in which a coupling protrusion coupled by an elastic force to a coupling hole formed in the backrest frame protrudes forward; and a locking member that is installed on the outer circumferential surface of the coupling member, and locks the elastic coupling protrusion into or unlocks the elastic coupling protrusion from the coupling hole. Therefore, the chair has the advantage that it is easy to replace a backrest part.

Description

chair

[0001] The present invention relates to a chair, and more specifically, to a chair having a backrest.

[0002] Generally, a dining chair consists of a seat and a backrest. The seat is positioned upward from the floor of the installation location by means of legs to support the user's buttocks and thighs, and the backrest is positioned protruding upward from the rear of the seat to support the user's back.

[0003] Korean Utility Model Publication No. 20-2022-0000587 (March 11, 2022) (hereinafter referred to as the "prior art") discloses a dining chair having a seat portion which is a seat part and a backrest portion which is a backrest part, and a "dining chair including a seat plate having a plurality of connection positions."

[0004] The above-described prior art relates to a dining chair comprising a seat, a frame, and a backrest, wherein the seat is characterized by having a seat latex laid on a seat synthetic wood and a seat fabric added thereto.

[0005] Meanwhile, the above dining chair includes not only the chair with the seat fabric attached to the seat portion of the above-mentioned prior art, but also the chair with the fabric attached to the back portion.

[0006] Considering the usage environment of the above dining chair, the backrest may be easily contaminated by food. When a chair with a fabric backrest is used as a dining chair, the fabric on the backrest cannot easily remove food stains, so it is aesthetically pleasing to replace the backrest.

[0007] However, since the above-mentioned conventional technology has a structure in which the backrest is fixed, there was a problem in that it was not easy to replace the backrest even if it became contaminated.

[0008]

[0009] The technical problem of the present invention is to provide a chair in which the backrest is easily replaceable.

[0010] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below.

[0011]

[0012] To achieve the above objective, the chair according to the present invention comprises a backrest frame, a backrest post, and a backrest connector. The backrest post is positioned at the rear of the backrest frame. The backrest connector connects the backrest frame and the backrest post. The backrest connector comprises a coupling member and a locking member. The coupling member has an elastic coupling projection formed protruding forward, which is coupled by elastic force into a coupling hole formed in the backrest frame. The locking member is installed on the outer surface of the coupling member. The locking member locks or unlocks the elastic coupling projection into the coupling hole.

[0013] A spiral groove extending to the outer surface of the elastic coupling projection may be formed on the outer surface of the above coupling member. A spiral projection coupled to the spiral groove may be formed on the inner surface of the above locking member.

[0014] The elastic coupling projection may be formed as an arc-shaped plate curved in the circumferential direction of the coupling member. The locking member may be formed in a shape that surrounds the outer surface of the coupling member. The locking member may be rotatably installed on the outer surface of the coupling member.

[0015] When the locking member is rotated in one direction, the spiral projection engages with the spiral groove formed on the elastic coupling projection, thereby pressing the elastic coupling projection inward and locking the hook formed on the elastic coupling projection in a state where it is inserted into the coupling hole. When the locking member is rotated in the other direction, the spiral projection exits the spiral groove formed on the elastic coupling projection, releasing the pressure on the elastic coupling projection and unlocking the hook so that it can be separated from the coupling hole.

[0016] A rear coupling portion may be formed protrudingly on the rear surface of the backrest frame. On the outer surface of the rear coupling portion, a seating groove in which the elastic coupling projection is seated and the coupling hole may be formed.

[0017] A guide groove may be formed in the rear coupling portion to guide the forward and backward movement of the hook on the outer surface within the seating groove. The coupling hole may be formed at the front end of the guide groove.

[0018] The above rear coupling portion may be formed as an arc-shaped plate curved in the circumferential direction of the coupling member.

[0019] The above elastic coupling protrusions may be formed by a plurality of elastic coupling protrusions spaced apart from each other in the circumferential direction. The above rear coupling part may be formed by a plurality of rear coupling parts spaced apart from each other in the circumferential direction. The plurality of elastic coupling protrusions and the plurality of rear coupling parts may be formed in a corresponding number.

[0020] The above-mentioned coupling member may be formed in a tubular shape with an open rear surface. An elasticity-imparting groove may be formed on the inner circumferential surface of the coupling member at a position corresponding to the elastic coupling projection, extending to the rear end of the coupling member.

[0021] A center tube may be formed protrudingly in the central portion of the front surface of the above-mentioned coupling member. The elastic coupling projection may be formed radially outwardly spaced from the center tube on the front surface of the above-mentioned coupling member.

[0022] A rotation-restricting projection may be formed on the front surface of the locking member. On the rear surface of the backrest frame, the rotation-restricting projection may be inserted, and an arc-shaped rotation-restricting groove curved in the circumferential direction of the locking member may be formed.

[0023] The above backrest connector may further comprise a fixed link member and a rotating link member. The fixed link member may be coupled to the backrest post. The rotating link member may be rotatably coupled to the fixed link member with a horizontal axis as the rotational center. The rotating link member may be coupled to the center tube.

[0024] A soft portion may be formed in the above-mentioned rotating link member that contacts the front surface of the above-mentioned fixed link member. The soft portion may deform when the above-mentioned rotating link member is rotated by the user's back load applied to the backrest.

[0025] A wing portion may be formed in the soft portion. The wing portion may protrude upward and downward from the rotating link member, respectively.

[0026] A post rib may be formed protrudingly on the front surface of the backrest post. The post rib may form an insertion groove into which the fixing link member is inserted. The post rib may be inserted into the interior of the locking member from the rear of the locking member.

[0027] Specific details of other embodiments are included in the detailed description and drawings.

[0028]

[0029] The chair according to the present invention has the effect of facilitating the replacement of the backrest portion because the backrest connector connecting the backrest frame and the backrest post comprises a coupling member having an elastic coupling projection protruding forward and coupled by elastic force to a coupling hole formed in the backrest frame, and a locking member installed on the outer surface of the coupling member to lock or unlock the elastic coupling projection to the coupling hole.

[0030] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims.

[0031]

[0032] FIG. 1 is a front perspective view showing a chair according to an embodiment of the present invention,

[0033] FIG. 2 is a bottom perspective view of FIG. 1 viewed from the rear,

[0034] FIG. 3 is a drawing showing the state with the backrest cushion removed from FIG. 1.

[0035] FIG. 4 is a front perspective view showing the backrest frame, backrest post, and backrest connector illustrated in FIG. 2 in a disassembled state.

[0036] FIG. 5 is a rear perspective view of FIG. 4,

[0037] FIG. 6 is an exploded view of the backrest connector shown in FIG. 4.

[0038] FIG. 7 is a rear perspective view of FIG. 6,

[0039] FIG. 8 is an enlarged view of the rear coupling portion formed on the rear surface of the backrest frame illustrated in FIG. 5.

[0040] FIG. 9 is an enlarged view of the connecting member shown in FIG. 6.

[0041] FIG. 10 is a rear perspective view of FIG. 9,

[0042] FIG. 11 is a cross-sectional view showing the state in which an elastic coupling projection of a coupling member shown in FIG. 9 is coupled to the rear coupling portion of the backrest frame shown in FIG. 8.

[0043] FIG. 12 is an exploded perspective view showing the rotating link member illustrated in FIG. 6,

[0044] FIG. 13 is a cross-sectional view showing the backrest frame illustrated in FIG. 4 connected to the backrest post through the backrest connector.

[0045]

[0046] <Explanation of Symbols>

[0047] 1 : Chair 120 : Backrest

[0048] 122 : Backrest frame 122A : Rear connecting part

[0049] 122B: Rotation control groove 122C: Seating groove

[0050] 122D: Guide groove 122E: Connecting hole

[0051] 400 : Backrest post 410 : Post rib

[0052] 700 : Backrest connector 710 : Connecting member

[0053] 712: Spiral groove 714: Elasticity-enhancing groove

[0054] 715 : Elastic coupling protrusion 716 : Hook

[0055] 717 : Center passage 720 : Locking member

[0056] 722 : Spiral projection 725 : Rotation-regulating projection

[0057] 730 : Fixed link member 740 : Rotating link member

[0058] 745 : Soft part 746 : Wing part

[0059] 751, 752: Horizontal axis

[0060]

[0061] Hereinafter, a chair according to an embodiment of the present invention will be described with reference to the drawings.

[0062] It should be noted that when assigning reference numerals to the components of each drawing, the same components are assigned the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0063] In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by such terms. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0064] FIG. 1 is a front perspective view showing a chair according to an embodiment of the present invention, FIG. 2 is a bottom perspective view looking at FIG. 1 from the rear, and FIG. 3 is a drawing showing the state with the backrest cushion removed from FIG. 1.

[0065] In the following description, regarding terms related to directions such as up, down, front, back, left, and right, the up, down, front, back, left, and right directions follow the up, down, front, back, left, and right directions indicated by the arrows in Fig. 1.

[0066] Referring to FIGS. 1 to 3, a chair (1) according to an embodiment of the present invention may include a chair body (100) and a leg portion (300).

[0067] The chair body (100) may include a seat portion (110) and a backrest portion (120). The seat portion (110) and the backrest portion (120) may be formed in a roughly rectangular shape.

[0068] The seat portion (110) may be extended forward and backward. The seat portion (110) may be a part where the user sits. The seat portion (110) may support the user's buttocks and the thighs of each of the user's legs.

[0069] The backrest portion (120) can be extended vertically. The backrest portion (120) can support the back load of the user.

[0070] The backrest portion (120) may be formed with a shape in which the front surface is concave and the rear surface is curved convexly. The backrest portion (120) may be connected to the seat portion (110) through a backrest post (400). That is, the backrest post (400) can connect the seat portion (110) and the backrest portion (120).

[0071] The backrest portion (120) can be connected to the backrest post (400) and supported by the backrest post (400). The rear surface of the backrest portion (120) can be connected to the front surface of the backrest post (400). The backrest portion (120) can be formed as a separate structure separated from the seat portion (110).

[0072] The seat portion (110) may include a seat cushion (111) and a seat frame (112). The seat cushion (111) may be positioned on the upper side of the seat frame (112).

[0073] The seat cushion (111) is formed of a material that has cushioning properties and can provide a cushioning sensation to the user, and the seat frame (112) is formed of a material that is harder than the seat cushion (111) and can support the seat cushion (111).

[0074] The backrest portion (120) may be a part that supports the user's back. The backrest portion (120) may include a backrest cushion (121) and a backrest frame (122). The backrest cushion (121) may be positioned in front of the backrest frame (122).

[0075] The backrest cushion (121) is formed of a material that has cushioning power and can provide a cushioning sensation to the user, and the backrest frame (122) is formed of a material that is harder than the backrest cushion (121) and can support the backrest cushion (121).

[0076] The backrest frame (122) can be formed in a plate shape. The backrest frame (122) can be formed in a roughly rectangular plate shape, and the front can be concave and the rear can be convex.

[0077] The rear surface of the backrest portion (120) can be connected to the front surface of the backrest post (400) through the backrest connector (700). That is, the rear surface of the backrest frame (122) can be connected to the front surface of the backrest post (400) through the backrest connector (700).

[0078] The seat cushion (111) and the backrest cushion (121) can be formed of the same material, and the seat frame (112) and the backrest frame (122) can be formed of the same material.

[0079] The seat frame (112) and backrest frame (122) are formed to be slightly flexible so that they can be slightly deformed by the weight of the user sitting on the chair (1).

[0080] The leg portion (300) can be positioned on the lower side of the chair body (100). The leg portion (300) can be positioned on the lower side of the seat portion (110). The leg portion (300) can support the chair body (100). The leg portion (300) can support the seat portion (110).

[0081] The leg portion (300) may include a plurality of leg bodies (310) arranged radially and a vertical rod (350) protruding upward from the center of the leg bodies (310) and connected to the lower side of the seat portion (110).

[0082] In this embodiment, the plurality of leg bodies (310) are formed as four, but it is possible to form three or more. A wheel (320) can be rotatably coupled to the end of each of the plurality of leg bodies (310).

[0083] The backrest post (400) can support the backrest portion (120). The upper part of the backrest post (400) can be extended vertically, and the lower part of the backrest post (400) can be bent forward from the upper bottom of the backrest post (400) and extended forward.

[0084] The backrest post (400) is positioned so that its upper portion protrudes upward from the rear of the seat portion (100) based on the bending portion, and can be connected to the rear surface of the backrest frame (122), which is the rear surface of the backrest portion (120), through a backrest connector (700).

[0085] The backrest post (400) is positioned at the lower side of the seat portion (100) based on the above-mentioned bending portion and can be connected to the lower side of the seat frame (120), which is the lower side of the seat portion (100), through a plurality of bolts. A plurality of fastening holes, each into which the plurality of bolts are fastened, may be formed at the lower end of the backrest post (400).

[0086] The top of the backrest post (400) may be positioned below the top of the backrest portion (120). The top of the backrest post (400) may be positioned below the top of the backrest frame (122).

[0087] The width of the backrest post (400) can be formed to be narrower than the width of the backrest part (120). The width of the backrest post (400) can be formed to be narrower than the width of the backrest frame (122).

[0088] The upper part of the backrest post (400) may be positioned opposite the left-right center of the backrest portion (120) on the rear side of the backrest portion (120). The upper part of the backrest post (400) may be positioned opposite the left-right center of the backrest frame (122) on the rear side of the backrest frame (122).

[0089] Meanwhile, the backrest portion (120) can be connected to the backrest post (400) through the backrest connector (700). That is, the backrest connector (700) can connect the rear surface of the backrest portion (120) and the front surface of the backrest post (400).

[0090] Hereinafter, the coupling structure of the backrest frame (122) and the backrest post (400) through the backrest connector (700) will be described with reference to FIG. 4 and FIG. 13.

[0091] FIG. 4 is a front perspective view showing the backrest frame, backrest post, and backrest connector shown in FIG. 2 in a disassembled state, and FIG. 5 is a rear perspective view of FIG. 4.

[0092] Referring to FIGS. 4 and 5, the backrest connector (700) can be fastened to the backrest post (400) through a plurality of bolts (739) at the rear end and can be coupled to the rear coupling part (122A) protruding from the rear surface of the backrest frame (122) through a plurality of elastic coupling protrusions (715) formed protruding forward at the front end.

[0093] That is, the rear portion of the backrest connector (700) can be fixed to the backrest post (400) through a plurality of bolts (739). And, the front portion of the backrest connector (700) is coupled to the rear coupling portion (122A) by the elastic force of a plurality of elastic coupling protrusions (715), so that the user can release the plurality of elastic coupling protrusions (715) from the rear coupling portion (122A) after removing the elastic force of the plurality of elastic coupling protrusions (715).

[0094] Therefore, the user can easily replace the backrest (120) after unfastening the elastic coupling projection (715) of the backrest connector (700) from the rear coupling portion (122A) of the backrest portion (120).

[0095] A post rib (410) may be formed protruding forward on the upper front surface of the backrest post (400). The post rib (410) may be formed in a circular shape to form a circular insertion groove on the inside into which the rear end of the backrest connector (700) is inserted. Within the circular insertion groove, a plurality of fastening grooves may be formed, each into which a plurality of bolts (739) are fastened.

[0096] Hereinafter, the connection structure of the backrest frame (122) and the backrest post (400) through the backrest connector (700) will be described in detail.

[0097] FIG. 6 is an exploded perspective view of the backrest connector shown in FIG. 4, FIG. 7 is a rear perspective view of FIG. 6, FIG. 8 is an enlarged view of the rear coupling portion formed on the rear surface of the backrest frame shown in FIG. 5, FIG. 9 is an enlarged view of the coupling member shown in FIG. 6, FIG. 10 is a rear perspective view of FIG. 9, FIG. 11 is a cross-sectional view showing the state in which the elastic coupling projection of the coupling member shown in FIG. 9 is coupled to the rear coupling portion of the backrest frame shown in FIG. 8, FIG. 12 is an exploded perspective view showing the rotating link member shown in FIG. 6, and FIG. 13 is a longitudinal cross-sectional view showing the state in which the backrest frame shown in FIG. 4 is coupled to the backrest post through the backrest connector.

[0098] Referring to FIGS. 6 to 13, the backrest connector (700) may include a coupling member (710), a locking member (720), a fixed link member (730), and a rotating link member (740).

[0099] The coupling member (710) may have an elastic coupling projection (715) formed protruding forward, which is coupled by elastic force to a coupling hole (122E, see FIG. 8) formed in the backrest frame (122). The coupling member (710) may be formed as a cylindrical shape with an open rear end, and the elastic coupling projection (715) may be formed protruding forward on the front surface of the coupling member (710). The elastic coupling projection (715) may be formed as an arc-shaped plate extending forward from the outer circumference of the coupling member (710). That is, the elastic coupling projection (715) may be formed as an arc-shaped plate curved in the circumferential direction of the coupling member (710).

[0100] The elastic coupling protrusions (715) may be formed as a plurality of elastic coupling protrusions (715) spaced apart from each other in the circumferential direction. In this embodiment, the plurality of elastic coupling protrusions (715) are formed as four elastic coupling protrusions (715) spaced apart from each other in the circumferential direction, but the number of elastic coupling protrusions (715) may be formed as at least one.

[0101] A locking member (720) may be installed on the outer surface of a coupling member (710). The locking member (720) may lock the elastic coupling projection (715) formed on the coupling member (710) in a state where it is coupled to a coupling hole (122E) formed in the backrest frame (122). Alternatively, the locking member (720) may unlock the elastic coupling projection (715) in a state where it is uncoupled to the coupling hole (122E).

[0102] The locking member (720) may be formed in a shape that surrounds the outer surface of the coupling member (710). For example, the locking member (720) may be formed in a ring shape to surround the outer surface of the coupling member (710). The locking member (720) may be rotatably positioned on the outer surface of the coupling member (710).

[0103] A spiral groove (712, see FIG. 9, FIG. 10 and FIG. 13) may be formed on the outer surface of the coupling member (710), and a spiral projection (722, see FIG. 6 and FIG. 13) that engages with the spiral groove (712) of the coupling member (710) may be formed on the inner surface of the locking member (720). Accordingly, the locking member (720) may be moved forward when rotated in one direction by a user, and may be moved backward when rotated in the other direction by a user.

[0104] The spiral groove (722) formed on the outer surface of the coupling member (710) can be extended to the outer surface of the elastic coupling projection (715) protruding forward of the coupling member (710).

[0105] Accordingly, when the locking member (720) is rotated in one direction by a user, the spiral projection (722) is coupled to the spiral groove (712) formed in the elastic coupling projection (715), thereby pressing the elastic coupling projection (715) inwardly and locking the hook (716, see FIG. 9) formed in the elastic coupling projection (715) in a state where it is inserted into the coupling hole (122E) formed in the rear coupling part (122A) of the backrest frame (122). The hook (716) may be formed to protrude inwardly from the front end of the inner circumference of the elastic coupling projection (715).

[0106] Additionally, when the locking member (720) is rotated in the opposite direction by the user, the spiral projection (722) comes out of the spiral groove (712) formed in the elastic coupling projection (715) and releases the pressure on the elastic coupling projection (715), thereby allowing the hook (716) formed in the elastic coupling projection (715) to be unlocked in a detachable state from the coupling hole (122E) formed in the rear coupling part (122A) of the backrest frame (122).

[0107] A seating groove (122C, see FIG. 8) and a coupling hole (122E) may be formed on the outer surface of a rear coupling part (122A) that is formed protruding from the rear surface of the backrest frame (122). When the backrest connector (700) is coupled to the backrest frame (122), the elastic coupling projection (715) of the backrest connector (700) is seated in the seating groove (122C) of the rear coupling part (122A), so the backrest part (200) can maintain a fixed state without rotating in the left and right directions.

[0108] The rear coupling portion (122A) may be formed by a plurality of rear coupling portions (122A) spaced apart from each other in the circumferential direction. The plurality of elastic coupling protrusions (715) and the plurality of rear coupling portions (122A) may be formed in a corresponding number. That is, the number of the plurality of rear coupling portions (122A) may be formed in a number corresponding to the number of the plurality of elastic coupling protrusions (715) formed on the coupling member (710). In this embodiment, since the number of elastic coupling protrusions (715) is formed as 4, the number of rear coupling portions (122A) may be formed as 4.

[0109] Additionally, the shape of the rear coupling portion (122A) of the backrest frame (122) may be formed to correspond to the shape of the elastic coupling projection (715) of the coupling member (710). In this embodiment, since the elastic coupling projection (715) is formed as an arc-shaped plate curved in the circumferential direction of the coupling member (710), the rear coupling portion (122A) may be formed as an arc-shaped plate curved in the circumferential direction of the coupling member (710).

[0110] Additionally, a guide groove (122D, see FIG. 8) may be formed on the outer surface within the seating groove (122C) of the rear coupling portion (122A) of the backrest frame (122). The guide groove (122D) may guide the forward and backward movement of the hook (716) formed on the elastic coupling projection (715) of the coupling member (710), and a coupling hole (122E) may be formed at the front end of the guide groove (122D).

[0111] The coupling member (710) may be formed in a tubular shape with an open rear surface. An elasticity-giving groove (714, see FIG. 10) extending to the rear end of the coupling member (710) may be formed on the inner surface of the coupling member (710) at a position corresponding to the elastic coupling projection (715).

[0112] The elasticity-giving groove (714) can provide elasticity to the coupling member (710) so that the coupling member (710) is not damaged by the pressure of the spiral projection (722) formed on the inner surface of the locking member (720) applied to the spiral groove (712) formed on the outer surface of the coupling member (710).

[0113] The number of elasticity-giving grooves (714) can be formed in a number corresponding to the number of elastic coupling protrusions (715). In this embodiment, since the number of elastic coupling protrusions (715) is formed as 4, the number of elasticity-giving grooves (714) can be formed as 4.

[0114] A center tube (717) may be formed protrudingly in the central part of the front surface of the coupling member (710). An elastic coupling projection (715) may be formed radially outwardly spaced from the center tube (717) on the front surface of the coupling member (710).

[0115] A rotation-regulating projection (725, see FIG. 6) may be formed on the front surface of the locking member (720). Additionally, a rotation-regulating projection (725) may be inserted into the rear surface of the backrest frame (122), and an arc-shaped rotation-regulating groove (122B, see FIG. 8) curved in the circumferential direction of the locking member (720) may be formed.

[0116] Accordingly, the locking member (720) can be rotated in one direction by a user until the rotation regulating projection (725) contacts one end of the rotation regulating groove (122B) in the longitudinal direction, and can be rotated in the other direction by a user until the rotation regulating projection (725) contacts the other end of the rotation regulating groove (122B) in the longitudinal direction. In this embodiment, the rotation regulating groove (122B) is formed in a semicircular shape, so that the locking member (720) can be rotated up to 180° in one direction or the other direction.

[0117] The fixed link member (730) can be coupled to the backrest post (400). That is, the fixed link member (730) may be a substantial component coupled to the backrest post (400) among the backrest connectors (700).

[0118] The fixed link member (730) is formed in a disc shape and can be inserted into the inner insertion groove of the post rib (410) that is formed protruding from the front surface of the backrest post (400).

[0119] That is, the post rib (410) can form an insertion groove into which the fixed link member (730) is inserted. The post rib (410) can be inserted into the interior of the locking member (710) from the rear of the locking member (710) as referenced in FIG. 13.

[0120] A plurality of fastening holes (738) may be formed in the fixed link member (730), and a plurality of fastening grooves corresponding to each of the plurality of fastening holes (738) may be formed in the inner insertion groove of the post rib (410). Here, a plurality of bolts (739) may be fastened to each of the plurality of fastening holes (738) and the plurality of fastening grooves, so that the fixed link member (730) can be coupled to the backrest post (400).

[0121] The rotating link member (740) can be rotatably coupled to the fixed link member (730) with the horizontal axis (751, 752) as the rotation center.

[0122] Specifically, a pair of shaft coupling parts (735) may be formed on the front surface of the fixed link member (730) so as to be spaced apart from each other in the left and right directions and protrude forward, and a fastening hole (736) may be formed in each of the pair of shaft coupling parts (735) so as to pass through in the left and right directions, and a fastening hole (742) may be formed in the rotating link member (740) so as to pass through in the left and right directions.

[0123] The rear portion of the rotary link member (740) can be inserted and positioned between a pair of shaft coupling portions (735). In this state, the fastening holes (736) formed in each of the pair of shaft coupling portions (735) and the fastening holes (742) formed in the rotary link member (740) can communicate with each other.

[0124] The horizontal axis (751, 752) is inserted into a fastening hole (736) formed in each of the pair of shaft coupling parts (735) of the fixed link member (730) and a fastening hole (742) formed in the rotating link member (740), so that the rotating link member (740) can be rotatably coupled to the fixed link member (730).

[0125] The horizontal axis (751) can be formed with a hollow nut-shaped shaft (751) and a bolt-shaped shaft (752) that is inserted into the hollow and fastened.

[0126] The rotating link member (740) can be coupled to the center tube (717) of the coupling member (710). Specifically, a pair of fastening holes (718) may be formed on the front surface of the center tube (717), and a pair of fastening grooves (748) corresponding to the pair of fastening holes (718) may be formed on the front surface of the rotating link member (740). A pair of bolts (719) are inserted into the pair of fastening holes (718) and the pair of fastening grooves (748) to connect the rotating link member (740) to the center tube (717) of the coupling member (710).

[0127] A soft portion (745) that contacts the front surface of the fixed link member (730) may be formed in the rotating link member (740). The soft portion (745) can generate a reaction force that resists the user's back load by deforming when the rotating link member (740) is rotated by the user's back load applied to the backrest member (120).

[0128] The rotating link member (740) can be formed of a hard material, and the soft part (745) can be formed of a material that can be deformed by the user's load. For example, the soft part (745) can be formed of a rubber material.

[0129] The soft part (745) can be formed integrally with the rotating link member (740). For example, when molding the rotating link member (740), the soft part (745) can be formed by double injection molding with the rotating link member (740) within the mold.

[0130] As referenced in FIG. 12, a protrusion (743) may be formed in the center of the front surface of the soft part (745). A recessed groove (744) recessed inwardly may be formed on the front surface of the protrusion (743). However, since the soft part (745) is formed integrally with the rotating link member (740), it is not substantially separated from the rotating link member (740) as referenced in FIG. 12. The rear portion of the hard part of the rotating link member (740) is inserted into the recessed groove (744) of the soft part (745), so that the hard part of the rotating link member (740) can be formed integrally with the soft part (745).

[0131] A wing portion (746) may be formed on the soft portion (745). The wing portion (746) may protrude upward and downward from the rotating link member (740). The wing portion (746) may be formed to protrude upward and downward from the hard portion of the rotating link member (740). When the rotating link member (740) is rotated by the user's back load applied to the backrest portion (120), the wing portion (746) may deform and generate a reaction force that resists the user's back load.

[0132]

[0133] The operation of the chair according to the embodiment of the present invention configured as above is as follows.

[0134] The chair (1) according to an embodiment of the present invention can be used as a dining chair. When the back cushion (121) of the backrest part (120) is contaminated by food during use of the chair (1), it is aesthetically pleasing to replace the backrest part (120) because it is difficult to remove the contamination.

[0135] When the user rotates the locking member (720) in one direction to replace the backrest (120), the spiral projection (722) formed on the inner surface of the locking member (720) moves backward along the spiral groove (712) formed on the outer surface of the coupling member (710), so the locking member (720) moves backward and releases the inward pressure of the elastic coupling projection (715) formed on the coupling member (710), thereby unlocking the lock.

[0136] Accordingly, since the hook (716) formed on the elastic coupling projection (715) is detachable from the coupling hole (122E) formed in the rear coupling portion (122A) of the backrest frame (122), the user can detach the contaminated backrest portion (120) from the backrest connector (700).

[0137] Afterward, in order to attach the new backrest part (120) to the connector (700), the user attaches the hook (716) formed on the elastic coupling projection (715) to the coupling hole (122E) formed on the rear coupling part (122A) of the backrest frame (122), and then rotates the locking member (720) in the other direction. Since the spiral projection (722) formed on the inner circumference of the locking member (720) moves forward along the spiral groove (712) formed on the outer circumference of the coupling member (710), the locking member (720) moves forward and can lock the elastic coupling projection (715) formed on the coupling member (710) by pressing it inward.

[0138] Accordingly, since the hook (716) formed on the elastic coupling projection (715) is in a state where it cannot be separated from the coupling hole (122E) formed in the rear coupling part (122A) of the backrest frame (122), the new backrest part (120) can maintain a state of being coupled to the backrest post (400) through the backrest connector (700).

[0139]

[0140] As described above, the backrest connector (700) connecting the backrest frame (122) and the backrest post (400) of the chair (1) according to the embodiment of the present invention includes a coupling member (710) having an elastic coupling projection (715) formed protruding forward and coupled by elastic force to a coupling hole (122E) formed in the backrest frame (122), and a locking member (720) installed on the outer surface of the coupling member (710) to lock or unlock the elastic coupling projection (715) to the coupling hole (122E), so that the backrest part (120) can be easily replaced.

[0141]

[0142] A person skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without altering its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included within the scope of the present invention.

[0143]

[0144] The present invention provides a chair in which the backrest is easy to replace.

Claims

1. Backrest frame; A backrest post positioned at the rear of the above backrest frame; and A backrest connector connecting the backrest frame and the backrest post; including The above backrest connector is, A coupling member having an elastic coupling projection formed protruding forward that is coupled by elastic force to a coupling hole formed in the backrest frame, and A chair comprising a locking member installed on the outer surface of the above-mentioned coupling member to lock or unlock the elastic coupling projection into the coupling hole.

2. In Claim 1, A spiral groove is formed on the outer surface of the above-mentioned coupling member, extending to the outer surface of the above-mentioned elastic coupling projection, and A chair having a spiral projection formed on the inner surface of the locking member that engages with the spiral groove.

3. In Claim 2, The above elastic coupling projection is formed as an arc-shaped plate curved in the circumferential direction of the coupling member, and The above locking member is formed in a shape that surrounds the outer surface of the coupling member and is rotatably installed on the outer surface of the coupling member.

4. In Claim 3, The above locking member is, When rotated in one direction, the spiral projection engages with the spiral groove formed on the elastic coupling projection, thereby pressing the elastic coupling projection inward to lock the hook formed on the elastic coupling projection in a state where it is inserted into the coupling hole. A chair that, when rotated in the opposite direction, the spiral projection comes out of the spiral groove formed in the elastic coupling projection, releasing the pressure of the elastic coupling projection to unlock the hook so that it can be separated from the coupling hole.

5. In Claim 3, A rear connecting part is formed protruding from the rear surface of the above-mentioned backrest frame, and A chair having a seating groove and a coupling hole formed on the outer surface of the rear coupling portion, wherein the elastic coupling projection is seated thereon.

6. In Claim 5, In the rear coupling portion above, a guide groove is formed on the outer surface within the seating groove to guide the forward and backward movement of the hook, and The above coupling hole is a chair formed at the front end of the above guide groove.

7. In Claim 6, The above rear connecting part is a chair formed by an arc-shaped plate curved in the circumferential direction of the connecting member.

8. In Claim 7, The above elastic coupling protrusion is formed of a plurality of elastic coupling protrusions spaced apart from each other in the circumferential direction, and The above rear coupling part is formed of a plurality of rear coupling parts spaced apart from each other in the circumferential direction, and A chair in which the plurality of elastic coupling protrusions and the plurality of rear coupling parts are formed in corresponding numbers.

9. In Claim 1, The above-mentioned connecting member is formed in a tubular shape with an open rear surface, and A chair having an elasticity-giving groove formed on the inner surface of the coupling member, extending to the rear end of the coupling member at a position corresponding to the elastic coupling projection.

10. In Claim 1, A center tube is formed protrudingly in the central part of the front surface of the above-mentioned connecting member, and The above elastic coupling projection is formed on the front surface of the coupling member, spaced radially outward from the center tube.

11. In Claim 1, A rotation-restricting projection is formed on the front surface of the above-mentioned locking member, and A chair in which the rotation-regulating projection is inserted into the rear surface of the backrest frame and an arc-shaped rotation-regulating groove is formed in the circumferential direction of the locking member.

12. In Claim 10, The above backrest connector is, A fixed link member coupled to the above-mentioned backrest post, and A chair further comprising a rotating link member coupled to the fixed link member so as to be rotatable with a horizontal axis as a rotational center and coupled to the center tube.

13. In Claim 12, A soft portion is formed in the above-mentioned rotating link member that contacts the front surface of the above-mentioned fixed link member, and The above soft part is a chair that deforms when the above-described rotating link member is rotated by the user's back load applied to the backrest.

14. In Claim 13, The above soft part is a chair comprising wing parts that protrude upward and downward from the above rotating link member.

15. In Claim 12, On the front surface of the above-mentioned backrest post, a post rib is formed protruding to form an insertion groove into which the above-mentioned fixing link member is inserted, and The above post rib is a chair that is inserted into the interior of the locking member from the rear of the locking member.

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