Multi-stage armrest structure

Abstract

The present invention provides a multi-stage armrest structure comprising: a shaft installed on a seat and having one end installed to rotate relative to an armrest; a housing connected to the armrest and having the other end of the shaft penetrate through it, and supporting the shaft while it is installed on the armrest; a pair of brackets connected to the shaft and fixed thereon; a ratchet connected to a hinge member connected to the pair of brackets so as to rotate together with the ratchet and meshing with the ratchet; and an elastic member provided between the brackets and the ratchet, which applies a rotational elastic force so that a ratchet gear tooth formed on the ratchet meshes with a sector gear tooth formed on the sector gear part, while simultaneously preventing axial movement of the ratchet between the pair of brackets.

Description

Technology Field

[0001] The present invention relates to a multi-stage armrest structure, and more specifically, to a multi-stage armrest structure that can adjust the locking state of an armrest that is provided on a seat as a single elastic member and can support a user's arm. Background Technology

[0003] Generally, seats in cars or trains are equipped with armrests that allow passengers to rest their arms on them, enabling them to assume a comfortable posture.

[0004] The above armrest serves to relieve passenger fatigue caused by prolonged riding, and prevents the passenger from suddenly leaning to one side when the vehicle makes a sudden start, turns suddenly while driving, or brakes suddenly.

[0005] These armrests are mounted on either side or one side of the seatback to allow the occupant to rest their arms. The armrests are exposed from the side of the seatback and are configured to comfortably support the occupant's arms.

[0006] In addition, the armrest can be positioned horizontally with respect to the floor surface of the interior, and when not in use, it can be rotated around an axis provided on one side to be positioned parallel to the backrest of the seat.

[0007] In addition, the armrest is configured to allow the angle of arm support to be adjusted according to the occupant's convenience. To achieve this, multiple gear and spring configurations are provided in a complex structure, which leads to problems such as increased weight or size.

[0008] In the case where a ratchet structure is applied to maintain the locking or unlocking state of a conventional armrest, additional parts such as leaf springs and ball bearings are required to prevent axial movement of the ratchet in addition to the spring for restoring the rotational direction of the ratchet, which resulted in a problem of increased number of parts and increased weight of the armrest. Prior art literature

[0010] Korean Registered Patent No. 10-2031263 The problem to be solved

[0011] The present invention was devised to solve the aforementioned problems, and its purpose is to provide a multi-stage armrest structure that can reduce the number of parts through structural simplification and thereby achieve lightweighting.

[0012] The objectives of the present invention are not limited to those mentioned above, and other unmentioned objectives of the present invention may be understood from the following description and may become more clearly known from the embodiments of the present invention. Furthermore, the objectives of the present invention may be realized by the means and combinations thereof set forth in the claims. means of solving the problem

[0014] To achieve the above objectives, a multi-stage armrest structure according to a preferred embodiment of the present invention provides a multi-stage armrest structure comprising: a shaft installed on a seat and having one end installed to rotate relative to the armrest; a housing connected to the armrest, through which the other end of the shaft passes, and which supports the shaft while it is installed on the armrest; a pair of brackets connected and fixed to the shaft; a ratchet rotatably connected to a hinge member connected to the pair of brackets; a sector gear portion connected to the armrest and rotating together with the ratchet, to which the ratchet engages; and an elastic member provided between the brackets and the ratchet, which applies a rotational elastic force so that a ratchet gear tooth formed on the ratchet engages with a sector gear tooth formed on the sector gear portion, while simultaneously preventing axial movement of the ratchet between the pair of brackets.

[0015] Additionally, the present invention provides a multi-stage armrest structure characterized by comprising: a ratchet body rotatably coupled to the hinge member; a ratchet gear formed at the end of the ratchet body and meshing with the sector gear; and a ratchet fixing projection formed protruding from one surface of the ratchet body and inserted and supported by the elastic member.

[0016] In addition, the elastic member comprises: a coupling portion coupled to the bracket; a slot portion into which the ratchet fixing projection is selectively inserted and supported; and a bending portion connecting the coupling portion and the slot portion and providing an elastic restoring force to move the coupling portion and the slot portion apart when they move closer together; thereby providing a multi-stage armrest structure.

[0017] Additionally, the sector gear section comprises: a sector gear section body connected to the armrest; a sector gear tooth formed along the side of the sector gear section body to mesh with the ratchet gear tooth; a first locking projection formed at one end of the sector gear section body and configured to engage with one end of the ratchet body; and a second locking projection formed at the other end of the sector gear section body and configured to engage with the other end of the ratchet body; thereby providing a multi-stage armrest structure.

[0018] Additionally, the multi-stage armrest structure is provided, characterized by including: a first slot configured to maintain the locking state of the armrest when the ratchet fixing projection is inserted into the slot portion; and a second slot formed between the first slot and the bending portion and configured to maintain the unlocked state of the armrest when the ratchet fixing projection is inserted.

[0019] Additionally, when the armrest is rotated in a first direction, the ratchet gear tooth moves to the end of the sector gear tooth, and then the ratchet body is caught on the first locking projection and rotated, and the second slot applies a load in the restoration direction of the bending part to the ratchet fixing projection, so that the ratchet fixing projection is disengaged from the first slot and inserted into the second slot, thereby providing a multi-stage armrest structure.

[0020] Additionally, when the armrest is rotated in a second direction, the ratchet body is caught on the second locking projection and rotated, and the first slot applies a load in the restoration direction of the bending part to the ratchet fixing projection, causing the ratchet fixing projection to detach from the second slot and be inserted into the first slot, thereby providing a multi-stage armrest structure.

[0021] Additionally, the shaft comprises: a shaft body installed in a seat by passing through a shaft through hole formed in the housing; a flange portion formed by extending radially from the shaft body to have a diameter larger than the shaft through hole and adhering to the housing; a bracket fastening portion formed protruding axially from the flange portion and fitted into the shaft fastening hole of the bracket; and a rotating shaft formed protruding axially from the fastening portion and inserted into a rotating hole formed in the armrest to be rotatably supported. The multi-stage armrest structure is provided. Effects of the invention

[0023] The present invention can achieve the following effects through the combination and usage relationships of the embodiments described above and the configurations described below.

[0024] According to the multi-stage armrest structure of the present invention, the number of parts can be reduced through structural simplification, thereby achieving the effect of lightweighting. Brief explanation of the drawing

[0026] FIG. 1 is a perspective view schematically illustrating a multi-stage armrest structure according to an embodiment of the present invention. FIG. 2 is an exploded perspective view schematically illustrating a multi-stage armrest structure according to an embodiment of the present invention. FIG. 3 is a side cross-sectional view schematically illustrating a multi-stage armrest structure according to an embodiment of the present invention. FIG. 4 is a cross-sectional view schematically illustrating the AA region of FIG. 3 in a multi-stage armrest structure according to an embodiment of the present invention. FIG. 5 is a cross-sectional view schematically illustrating the state of the armrest being locked and the state of the ratchet fixing projection inserted into the elastic member in a multi-stage armrest structure according to an embodiment of the present invention. FIG. 6 is a cross-sectional view schematically illustrating the state in which the armrest is unlocked and the state change of the ratchet fixing projection inserted into the elastic member in a multi-stage armrest structure according to an embodiment of the present invention. FIG. 7 is a cross-sectional view schematically illustrating the state of the armrest in an unlocked state and the state of the ratchet fixing projection inserted into the elastic member in a multi-stage armrest structure according to an embodiment of the present invention. FIG. 8 is a cross-sectional view schematically illustrating the state of the armrest being locked and the state change of the ratchet fixing projection inserted into the elastic member in a multi-stage armrest structure according to an embodiment of the present invention. Specific details for implementing the invention

[0027] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0028] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and should be interpreted to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0029] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions unless the context clearly indicates otherwise.

[0030] Unless otherwise defined, all terms used herein, including technical or scientific terms, may 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 may be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and may not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0031] Additionally, terms such as "...part," "...part," etc., as described in the specification refer to a unit that processes at least one function or operation, and this may be implemented as hardware or a combination of hardware.

[0032] In addition, "top" as described in the specification refers to the direction of movement upward in the height direction of the drawing, and "bottom" refers to the direction of movement downward in the height direction of the drawing.

[0033] In addition, the classification of the names of components in this specification as "first," "second," etc., is intended to distinguish them due to identical names, and is not necessarily limited to that order in the following description.

[0035] Specific embodiments of the present invention will be described below with reference to the attached drawings.

[0036] FIG. 1 is a perspective view schematically illustrating a multi-stage armrest structure according to an embodiment of the present invention, FIG. 2 is an exploded perspective view schematically illustrating a multi-stage armrest structure according to an embodiment of the present invention, FIG. 3 is a side cross-sectional view schematically illustrating a multi-stage armrest structure according to an embodiment of the present invention, FIG. 4 is a cross-sectional view schematically illustrating the AA area of ​​FIG. 3 cut in the multi-stage armrest structure according to an embodiment of the present invention, FIG. 5 is a cross-sectional view schematically illustrating the state of the armrest in a locked state and the state of the ratchet fixing projection inserted into the elastic member in the multi-stage armrest structure according to an embodiment of the present invention, FIG. 6 is a cross-sectional view schematically illustrating the state of the armrest in an unlocked state and the state change of the ratchet fixing projection inserted into the elastic member in the multi-stage armrest structure according to an embodiment of the present invention, FIG. 7 is a cross-sectional view schematically illustrating the state of the armrest in an unlocked state and the state of the ratchet fixing projection inserted into the elastic member in the multi-stage armrest structure according to an embodiment of the present invention, FIG. 8 is a cross-sectional view schematically illustrating the state of the armrest being locked and the state change of the ratchet fixing projection inserted into the elastic member in a multi-stage armrest structure according to an embodiment of the present invention.

[0037] Referring to FIGS. 1 to 8, a multi-stage armrest structure (100) according to an embodiment of the present invention comprises a shaft (200) installed on a seat (not shown), a housing (300) that rotatably installs the shaft (200) on an armrest (10), a bracket (400) that is fastened and fixed to the shaft (200), a ratchet (500) that is rotatably fastened to the bracket (400), a sector gear portion (600) that is fastened to the armrest (10) and engages with the ratchet (500), and an elastic member (700) that applies elastic force to cause the ratchet (500) to engage with the sector gear portion (600).

[0038] Here, the elastic member (700) is provided between the bracket (400) and the ratchet (500), and is configured to apply a rotational elastic force so that the ratchet gear tooth (520) formed on the ratchet (500) meshes with the sector gear tooth (620) formed on the sector gear part (600), while simultaneously preventing axial movement of the ratchet (500) between the pair of brackets (400).

[0039] When the above armrest (10) is rotated within a certain angle range in the first direction from the initial locking state, the ratchet (500) is maintained in a state where it is engaged with the sector gear part (600), so that the user can use the armrest (10) at an angle they desire.

[0040] Here, the first direction refers to the direction of rotating one end of the armrest (10) upward with respect to FIG. 3, and the second direction refers to the direction of rotating one end of the armrest (10) downward with respect to FIG. 3.

[0041] When the armrest (10) is rotated in a first direction while locked at a preset angle, the armrest (10) can be rotated until it is unlocked and almost upright, so that it is positioned parallel to the seat back. In this state, when the armrest (10) is rotated again in a second direction by the angle of the initial locking state of the armrest (10), the armrest (10) can be switched back to a locked state.

[0042] For this operation, the armrest (10) is rotatably installed on the seat through the shaft (200).

[0043] And, the shaft (200) is installed on the seat, and one end is installed so as to rotate relative to the armrest (10). The shaft (200) is fixed to the armrest (10) in a rotating state by the housing (300). The housing (300) is fastened to the armrest (10), and the other end of the shaft (200) passes through it. The housing (300) is configured to support the shaft (200) in a state where it is installed on the armrest (10).

[0044] More specifically, the shaft (200) comprises a shaft body (210) installed in a seat by passing through a shaft through hole (310) formed in the housing (300), a flange portion (220) formed to extend radially from the shaft body (210) to have a diameter larger than the shaft through hole (310) and close to the housing (300), a bracket fastening portion (230) formed protruding axially from the flange portion (220) and fitted into a shaft fastening hole (411, 421) formed in the bracket (400), and a rotating shaft (240) formed protruding axially from the bracket fastening portion (230) and inserted into a rotating hole (11) formed in the armrest (10) to be rotatably supported.

[0045] That is, the shaft (200) is rotatably inserted into the rotation hole (11) of the armrest (10) with the rotation axis (240), and the housing (300) is fastened to the armrest (10), so that the shaft body (210) protrudes outward from the housing (300) through the shaft penetration hole (310) of the housing (300), and the armrest (10) is rotatably installed on the shaft (200) with the flange portion (220) in close contact with the inner surface of the housing (300).

[0046] The above bracket (400) is inserted and fastened into the bracket fastening portion (230) of the shaft (200) and fastened to the shaft (200).

[0047] The above bracket (400) is formed as a pair. For example, the bracket (400) may consist of a bracket body (410) and a bracket cover (420) coupled to the bracket body (410).

[0048] The above bracket body (410) is positioned on the inner circumference of the armrest (10), and a shaft fastening hole (411) into which the bracket fastening part (230) of the shaft (200) is inserted and fastened, and a hinge member fastening hole (412) into which a hinge member (430) into which the ratchet (500) is rotatably fastened is inserted through are formed.

[0049] The bracket cover (420) is positioned to be in close contact with the flange portion (220) of the shaft (200) and is fastened to the bracket body (410) while the ratchet (500) is inserted into the hinge member (430), thereby preventing the ratchet (500) from disengaging in the axial direction. In this bracket cover (420), a shaft fastening hole (421) into which the bracket fastening portion (230) of the shaft (200) is inserted and fastened, and a hinge member fastening hole (422) into which the hinge member (430) is inserted through are formed.

[0050] Here, the shaft fastening holes (411, 421) have irregularities formed along their circumference, and the outer surface of the bracket fastening part (230) of the shaft (200) also has irregularities of a corresponding shape formed thereon, so that the shaft (200) is fastened and fixed so as not to rotate relative to it.

[0051] The ratchet (500) is rotatably connected to a hinge member (430) connected to a pair of brackets (400). More specifically, the ratchet (500) comprises a ratchet body (510) inserted into the hinge member (430) and rotatably connected, a ratchet gear tooth (520) formed at the end of the ratchet body (510) and meshing with the sector gear tooth (620), and a ratchet fixing projection (530) formed protruding from one side of the ratchet body (510) and inserted and supported by the elastic member (700).

[0052] With this configuration, the ratchet (500) is positioned to face the sector gear portion (600), and the ratchet gear tooth (520) can move along the sector gear tooth (620) while engaged with the sector gear tooth (620) by the elastic force of the elastic member (700).

[0053] The ratchet (500) is inserted into a hinge member (430) connected to the bracket (400) and is rotatably connected, and the ratchet gear tooth (520) is engaged with the sector gear tooth (620) by the elastic force of the elastic member (700).

[0054] The sector gear unit (600) is connected to the armrest (10) and rotates together with the armrest (10), and is configured to engage with the ratchet (500).

[0055] More specifically, the sector gear unit (600) comprises a sector gear unit body (610) connected to the armrest (10), a sector gear tooth (620) formed along the side of the sector gear unit body (610) to mesh with the ratchet gear tooth (520), a first catch (630) formed at one end of the sector gear unit body (610) and configured to catch one end of the ratchet body (510), and a second catch (640) formed at the other end of the sector gear unit body (610) and configured to catch the other end of the ratchet body (510).

[0056] The sector gear body (610) has a plurality of fastening parts (611) formed therein. The sector gear body (610) is fastened to the housing (300) by inserting a fastening bolt (612) through the fastening part (611), the armrest groove (12) formed on the inner circumference of the armrest (10), and the housing hole (320) formed in the housing (300).

[0057] The sector gear tooth (620) is formed as a longer area than the ratchet gear tooth (520), and the ratchet gear tooth (520) can move along the sector gear tooth (620) while engaged with the sector gear tooth (620).

[0058] Referring to FIG. 5, the initial locking state of the above-described armrest (10) means that the ratchet gear tooth (520) is engaged with one end of the sector gear tooth (620). Additionally, the state in which the above-described armrest (10) is locked at a preset angle means that the ratchet gear tooth (520) is engaged with the other end of the sector gear tooth (620).

[0059] The elastic member (700) comprises a coupling part (710) coupled to the bracket (400), a slot part (720) into which the ratchet fixing projection (530) is selectively inserted and supported, and a bending part (730) that connects the coupling part (710) and the slot part (720) and provides an elastic restoring force to move the coupling part (710) and the slot part (720) apart when they move closer to each other.

[0060] With this configuration, the elastic member (700) applies a rotational elastic force to the ratchet (500) so that the ratchet gear tooth (520) meshes with the sector gear tooth (620). Additionally, the elastic restoring force of the bending part (730) can prevent axial movement of the ratchet (500) between the pair of brackets (400).

[0061] The slot portion (720) comprises a first slot (721) and a second slot (722). The first slot (721) is configured to maintain the locking state of the armrest (10) when the ratchet fixing projection (530) is inserted. The second slot (722) is formed between the first slot (721) and the bending portion (730) and is configured to maintain the unlocked state of the armrest (10) when the ratchet fixing projection (530) is inserted. The first slot (721) and the second slot (722) are formed continuously so that the ratchet fixing projection (530) can move continuously along the first slot (721) and the second slot (722).

[0062] Referring to FIGS. 5 to 7, a multi-stage armrest structure (100) according to one embodiment of the present invention can release the locking state of the armrest (10) when the armrest (10) is rotated in a first direction.

[0063] When the armrest (10) is rotated in the first direction, the ratchet gear tooth (520) moves to the end of the sector gear tooth (620), and then the ratchet body (510) is caught on the first locking projection (630) and rotated, and the second slot (722) applies a load in the restoration direction of the bending part (730) to the ratchet fixing projection (530), causing the ratchet fixing projection (530) to detach from the first slot (721) and be inserted into the second slot (722).

[0064] More specifically, as illustrated in FIG. 5, when the armrest (10) is rotated in a first direction from an initial locking state of the armrest (10) so that the ratchet gear tooth (520) moves from one end of the sector gear tooth (620) to the other end, the armrest (10) can reach a locked state at a preset angle. At this time, the ratchet fixing projection (530) is maintained in a state inserted into the first slot (721). The first slot (721) can maintain the locked state of the armrest (10) by applying a restoring direction load to the ratchet fixing projection (530) with respect to the rotational direction of the ratchet body (510).

[0065] Referring to FIG. 6, when the armrest (10) is locked at a preset angle and the armrest (10) is rotated in a first direction, the ratchet body (510) is caught on the first locking projection (630) and rotated. In this case, the ratchet gear tooth (520) is disengaged from the sector gear tooth (620), and the locking state of the armrest (10) can be released.

[0066] At this time, the ratchet fixing projection (530) is disengaged from the first slot (721) and inserted into the second slot (722) as the ratchet body (510) is caught on the first catch (630) and rotated. The second slot (722) applies a load in the restoration direction of the bending part (730) to the ratchet fixing projection (530) when the ratchet body (510) is caught on the first catch (630) and the ratchet fixing projection (530) is disengaged from the first slot (721).

[0067] Referring to FIG. 7, the armrest (10) in an unlocked state can be placed in a side storage position of the seat back. At this time, a stopper can be formed on the inner side of the armrest (10) to limit the uppermost storage position of the armrest (10). The ratchet fixing projection (530) is maintained in a state inserted into the second slot (722), so that the ratchet body (510) is maintained in a state where it does not rotate.

[0068] Meanwhile, referring to FIG. 8, in a multi-stage armrest structure (100) according to one embodiment of the present invention, when the armrest (10) is rotated in a second direction, the ratchet body (510) is caught on the second catch (640) and rotated, and the first slot (721) applies a load in the restoration direction of the bending part (730) to the ratchet fixing projection (530), causing the ratchet fixing projection (530) to detach from the second slot (722) and be inserted into the first slot (721).

[0069] More specifically, when the armrest (10) in the unlocked state of FIG. 7 is rotated in a second direction to the extent that the ratchet body (510) engages with the second catch (640), the ratchet body (510) engages with the second catch (640) and rotates. At this time, the ratchet body (510) is rotated so as not to interfere with the first catch (630).

[0070] When the ratchet body (510) is rotated by being caught on the second catch (640), the ratchet fixing projection (530) inserted into the second slot (722) is disengaged from the second slot (722). The ratchet fixing projection (530) disengaged from the second slot (722) receives the restoration direction load of the bending part (730) from the first slot (721) and moves to the first slot (721).

[0071] At this time, the ratchet gear (520) is engaged with one end of the sector gear (620), and the armrest (10) is in an initial locking state.

[0072] In summary, the present invention provides a multi-stage armrest structure (100) that can reduce the number of parts through structural simplification and achieve lightweighting by controlling the locking state and unlocking state of the armrest (10) through one elastic member (700) including two slots.

[0073] Although the present invention has been described in detail through specific embodiments, this is for the purpose of specifically explaining the invention and is not limited thereto. It is evident that modifications or improvements to the present invention are possible by those skilled in the art within the technical scope of the invention.

[0074] All simple variations or modifications of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be clarified by the appended claims. Explanation of the symbols

[0076] 10: Armrest 100: Multi-stage armrest structure 200 : Shaft 210 : Shaft body 220: Flange section 230: Bracket fastening section 240 : Rotation axis 300 : Housing 310 : Shaft through hole 320 : Housing hole 400 : Bracket 410 : Bracket body 420 : Bracket cover 430 : Hinge member 500 : Ratchet 510 : Ratchet body 520 : Ratchet gear 530 : Ratchet locking projection 600 : Sector gear section 610 : Sector gear section body 620 : Sector gear 630 : First locking tab 640 : Second stopper 700 : Elastic member 710 : Connecting part 720 : Slot part 721: 1st Slot 722: 2nd Slot 730 : Bending section

Claims

Claim 1 A shaft installed on a seat and having one end installed to rotate relative to an armrest; a housing connected to the armrest, through which the other end of the shaft passes, and which supports the shaft while it is installed on the armrest; a pair of brackets connected and fixed to the shaft; a ratchet rotatably connected to a hinge member connected to the pair of brackets; a sector gear portion connected to the armrest and rotating together with the ratchet, to which the ratchet engages; and an elastic member provided between the brackets and the ratchet, which applies a rotational elastic force so that a ratchet gear tooth formed on the ratchet meshes with a sector gear tooth formed on the sector gear portion, while simultaneously preventing axial movement of the ratchet between the pair of brackets; wherein the elastic member comprises: a connecting portion connected to the bracket; a slot portion into which the ratchet is selectively inserted and supported; and a bending portion connecting the connecting portion and the slot portion, and providing an elastic restoring force to cause the connecting portion and the slot portion to move apart when they come closer to each other. A multi-stage armrest structure including Claim 2 A multi-stage armrest structure according to claim 1, wherein the ratchet comprises: a ratchet body rotatably coupled to the hinge member; a ratchet gear formed at the end of the ratchet body and meshing with the sector gear; and a ratchet fixing projection formed protruding from one surface of the ratchet body and inserted and supported by the elastic member. Claim 3 delete Claim 4 In paragraph 2, the sector gear part comprises: a sector gear part body fastened to the armrest; a sector gear tooth formed along the side of the sector gear part body to mesh with the ratchet gear tooth; a first locking projection formed at one end of the sector gear part body and configured to engage one end of the ratchet body; and a second locking projection formed at the other end of the sector gear part body and configured to engage the other end of the ratchet body; characterized in that it comprises a multi-stage armrest structure. Claim 5 A multi-stage armrest structure according to claim 4, wherein the slot portion comprises: a first slot configured to maintain a locking state of the armrest when the ratchet fixing projection is inserted; and a second slot formed between the first slot and the bending portion and configured to maintain an unlocked state of the armrest when the ratchet fixing projection is inserted. Claim 6 A multi-stage armrest structure according to claim 5, characterized in that when the armrest is rotated in a first direction, the ratchet gear tooth moves to the end of the sector gear tooth, after which the ratchet body is caught on the first locking projection and rotated, and the second slot applies a load in the restoration direction of the bending part to the ratchet fixing projection so that the ratchet fixing projection is disengaged from the first slot and inserted into the second slot. Claim 7 A multi-stage armrest structure according to claim 6, characterized in that when the armrest is rotated in a second direction, the ratchet body is caught on the second locking projection and rotated, and the first slot applies a load in the restoration direction of the bending part to the ratchet fixing projection so that the ratchet fixing projection is disengaged from the second slot and inserted into the first slot. Claim 8 A multi-stage armrest structure according to claim 1, wherein the shaft comprises: a shaft body installed in a seat by passing through a shaft through hole formed in the housing; a flange portion formed to extend radially from the shaft body and adhering to the housing so as to have a diameter larger than the shaft through hole; a bracket fastening portion formed to protrude axially from the flange portion and fitted into a shaft fastening hole of the bracket; and a rotating shaft formed to protrude axially from the fastening portion and inserted into a rotating hole formed in the armrest to be rotatably supported.

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