Multi-stage armrest structure

Abstract

The present invention provides a multi-stage armrest structure comprising: a shaft provided to a seat, one side end of the shaft being provided to an armrest so as to be relatively rotatable; a housing fastened to the armrest, the other end of the shaft penetrating through the housing, so that the housing supports the shaft in a state of being disposed on the armrest; a pair of brackets fastened and fixed to the shaft; a ratchet rotatably fastened to a hinge member fastened to the pair of brackets; a sector gear part which is fastened to the armrest, rotates together with the armrest, and meshes with the ratchet wheel; and an elastic member that is provided between the brackets and the ratchet, applies an elastic force in the rotational direction to engage ratchet gear teeth formed on the ratchet with sector gear teeth formed on the sector gear portion, and prevents the ratchet from moving in the axial direction between the pair of brackets.

Description

Technical Field

[0001] The present invention relates to a multi-stage armrest structure, and more particularly to a multi-stage armrest structure capable of adjusting the locking state of an armrest provided on a seat and capable of supporting a user's arm by a single elastic member. Background Art

[0002] Generally, seats in cars, trains, and the like are provided with armrests on which passengers can place their arms so that the passengers can have a comfortable posture.

[0003] The armrest can play the following role: eliminate the fatigue of passengers caused by long-term riding, or prevent passengers from suddenly falling to one side when the car starts quickly, rotates rapidly during driving, or brakes suddenly.

[0004] Such an armrest is installed on both sides or any side of the seat back so that the passenger can place his arm. And the armrest is in a state exposed to the outside at the side of the seat back, and is configured to support the passenger's arm stably.

[0005] Furthermore, the armrest can be arranged so that the arm can be placed in a state parallel to the floor surface of the room, and when the armrest is not in use, it can be rotated around an axis provided on one side to be parallel to the backrest of the seat.

[0006] In addition, the armrest can be configured to adjust the angle of the armrest according to the convenience of the passenger. For this reason, the armrest is configured as a complex structure by a plurality of gear structures and spring structures, and there is a problem of increasing weight or size.

[0007] When a ratchet structure is used to maintain the locked state or unlocked state of the existing armrest, in addition to the spring for restoring the rotation direction of the ratchet, other additional components such as a leaf spring and a ball bearing are required to prevent axial movement of the ratchet, resulting in a problem of an increase in the number of components of the armrest and an increase in weight.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Korean Registration Patent No. 10-2031263 Summary of the invention

[0011] Technical issues

[0012] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a multi-stage handrail structure that can reduce the number of components by simplifying the structure, thereby achieving a lightweight structure.

[0013] The purpose of the present invention is not limited to the above-mentioned purpose, and other purposes not mentioned can also be clearly understood by those skilled in the art from the embodiments of the present invention. In addition, the purpose of the present invention can be achieved by the means shown in the claims and their combinations.

[0014] Technical means

[0015] In order to achieve the above-mentioned purpose, a multi-stage armrest structure based on a preferred embodiment of the present invention includes: a shaft, which is arranged on the seat, and one side end of which can be relatively rotatably arranged on the armrest; a shell, which is fastened to the above-mentioned armrest, and the other end of the above-mentioned shaft passes through the above-mentioned shell, so that the above-mentioned shell supports the above-mentioned shaft in a state of being arranged on the above-mentioned armrest; a pair of brackets, which are fastened and fixed to the above-mentioned shaft; a ratchet, which is rotatably fastened to a hinge component, and the hinge component is fastened to the above-mentioned pair of brackets; a fan-shaped gear part, which is fastened to the above-mentioned armrest and rotates together and meshes with the above-mentioned ratchet; and an elastic part, which is arranged between the above-mentioned bracket and the above-mentioned ratchet, applies an elastic force in the rotation direction to make the ratchet gear teeth formed on the above-mentioned ratchet mesh with the fan-shaped gear teeth formed on the above-mentioned fan-shaped gear part, and prevents the above-mentioned ratchet from floating axially between the above-mentioned pair of brackets.

[0016] In addition, in the above-mentioned multi-stage armrest structure, the above-mentioned ratchet may include: a ratchet body, which can be rotatably fastened to the above-mentioned hinge component; ratchet gear teeth, formed at the end of the above-mentioned ratchet body, meshing with the above-mentioned fan-shaped gear teeth; and a ratchet fixing protrusion, which is formed to protrude from one side of the above-mentioned ratchet body and is inserted into the above-mentioned elastic component to be supported.

[0017] In addition, in the above-mentioned multi-stage armrest structure, the above-mentioned elastic component may include: a connecting portion, which is connected to the above-mentioned bracket; a groove portion, in which the above-mentioned ratchet fixing protrusion is selectively inserted and supported; and a bending portion, which connects the above-mentioned connecting portion and the above-mentioned groove portion, and provides an elastic restoring force to make the above-mentioned connecting portion and the above-mentioned groove portion move away from each other when the above-mentioned connecting portion and the above-mentioned groove portion are close to each other.

[0018] In addition, in the above-mentioned multi-stage armrest structure, the above-mentioned fan-shaped gear part may include: a fan-shaped gear part main body, which is fastened to the above-mentioned armrest; fan-shaped gear teeth, which are formed along the side surface of the above-mentioned fan-shaped gear part main body so as to engage with the above-mentioned ratchet gear teeth; a first locking platform, which is formed at one end of the above-mentioned fan-shaped gear part main body and is configured to be locked for one end of the above-mentioned ratchet body; and a second locking platform, which is formed at the other end of the above-mentioned fan-shaped gear part main body and is configured to be locked for the other end of the above-mentioned ratchet body.

[0019] In addition, in the above-mentioned multi-stage armrest structure, the above-mentioned groove portion may include: a first groove, which is configured to maintain the locked state of the above-mentioned armrest when the above-mentioned ratchet fixing protrusion is inserted; and a second groove, which is formed between the above-mentioned first groove and the above-mentioned bent portion, and is configured to maintain the unlocked state of the above-mentioned armrest when the above-mentioned ratchet fixing protrusion is inserted.

[0020] In addition, in the above-mentioned multi-stage armrest structure, when the above-mentioned armrest is rotated in the first direction, after the above-mentioned ratchet gear teeth move to the end of the above-mentioned fan-shaped gear teeth, the above-mentioned ratchet body is locked to the above-mentioned first locking platform and rotates, and the above-mentioned second groove applies the restoration direction load of the above-mentioned bending part to the above-mentioned ratchet fixing protrusion, so that the above-mentioned ratchet fixing protrusion is disengaged from the above-mentioned first groove and inserted into the above-mentioned second groove.

[0021] In addition, in the above-mentioned multi-stage armrest structure, when the above-mentioned armrest is rotated in the second direction, the above-mentioned ratchet body is locked to the above-mentioned second locking platform and rotates, and the above-mentioned first groove applies the restoration direction load of the above-mentioned bending part to the above-mentioned ratchet fixing protrusion, so that the above-mentioned ratchet fixing protrusion is disengaged from the above-mentioned second groove and inserted into the above-mentioned first groove.

[0022] In addition, in the above-mentioned multi-stage armrest structure, the above-mentioned shaft may include: a shaft body, which is penetrated through the shaft through hole formed in the above-mentioned shell and is set on the seat; a flange portion, which is extended from the above-mentioned shaft body in the radial direction and has a diameter larger than the above-mentioned shaft through hole, and is in close contact with the above-mentioned shell; a bracket fastening portion, which is formed to protrude axially from the above-mentioned flange portion and is embedded and fastened to the shaft fastening hole of the above-mentioned bracket; and a rotating shaft, which is formed to protrude axially from the above-mentioned fastening portion and is inserted into the rotating hole formed in the above-mentioned armrest and is rotatably supported.

[0023] Effects of the Invention

[0024] The present invention can obtain the following effects through the combination and use relationship of the above-mentioned present embodiment and the structure described below.

[0025] According to the multi-stage handrail structure according to the present invention, it is possible to obtain an effect of reducing the number of components by simplifying the structure, thereby achieving weight reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a perspective view schematically showing a multi-stage handrail structure according to an embodiment of the present invention.

[0027] Figure 2 This is an exploded perspective view schematically showing a multi-stage handrail structure according to an embodiment of the present invention.

[0028] Figure 3 It is a side cross-sectional view schematically showing a multi-stage handrail structure according to an embodiment of the present invention.

[0029] Figure 4 The multi-level handrail structure according to the embodiment of the present invention is schematically shown along Figure 3 Cross-sectional view of the AA area cut.

[0030] Figure 5 This is a cross-sectional view schematically showing a state where the armrest is locked and a state where the ratchet fixing protrusion is inserted into the elastic member in the multi-stage armrest structure according to the embodiment of the present invention.

[0031] Figure 6 This is a cross-sectional view schematically showing a state in which the armrest is unlocked and a state change of the ratchet fixing protrusion inserted into the elastic member in the multi-stage armrest structure according to the embodiment of the present invention.

[0032] Figure 7 This is a cross-sectional view schematically showing a state in which the armrest is unlocked and a state in which the ratchet fixing protrusion is inserted into the elastic member in the multi-stage armrest structure according to the embodiment of the present invention.

[0033] Figure 8 This is a cross-sectional view schematically showing a state in which an armrest is locked and a change in state of a ratchet fixing protrusion inserted into an elastic member in a multi-stage armrest structure according to an embodiment of the present invention.

[0034] Description of Reference Numerals

[0035] 10: Handrail 100: Multi-level handrail structure

[0036] 200: shaft 210: shaft body

[0037] 220: flange part 230: bracket fastening part

[0038] 240: Rotating shaft 300: Housing

[0039] 310: shaft through hole 320: housing hole

[0040] 400: bracket 410: bracket body

[0041] 420: bracket cover 430: hinge part

[0042] 500: ratchet 510: ratchet body

[0043] 520: ratchet gear teeth 530: ratchet fixing protrusion

[0044] 600: sector gear part 610: sector gear part main body

[0045] 620: sector gear teeth 630: first stop

[0046] 640: second stopper 700: elastic member

[0047] 710: Joint 720: Groove

[0048] 721: First slot 722: Second slot

[0049] 730: Bend DETAILED DESCRIPTION

[0050] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0051] The present invention can be modified in various ways and can have multiple embodiments. Specific embodiments are shown in the drawings and described in detail. This is not intended to limit the present invention to specific embodiments, but should be interpreted as including all modifications, equivalents and even substitutes included in the inventive concept and technical scope.

[0052] The terms used in this application are only for describing specific embodiments and are not intended to limit the present invention. Unless the context clearly indicates a different meaning, a single expression includes a plurality of expressions.

[0053] In addition, unless otherwise defined, all terms used herein, including technical terms or scientific terms, have the same meaning as those generally understood by those skilled in the art. Terms that are the same as terms defined in generally used dictionaries should be interpreted as having the same meaning as that in the context of the relevant technology, and should not be interpreted as having an ideal or overly formal meaning unless clearly defined in this application.

[0054] In addition, the terms "... unit", "... component" and the like described in the specification represent a unit for processing at least one function or action, and can be implemented by hardware or a combination of hardware.

[0055] In addition, the “upper end” described in the specification indicates a direction moving toward the upper end in the height direction of the drawings, and the “lower end” indicates a direction moving toward the lower end in the height direction of the drawings.

[0056] In addition, in this specification, the names of components are distinguished by first, second, etc. in order to distinguish components with the same name, and the order is not limited in the following specification.

[0057] Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

[0058] Figure 1 This is a perspective view schematically showing a multi-stage handrail structure according to an embodiment of the present invention.

[0059] Figure 2This is an exploded perspective view schematically showing a multi-stage handrail structure according to an embodiment of the present invention.

[0060] Figure 3 It is a side cross-sectional view schematically showing a multi-stage handrail structure according to an embodiment of the present invention. Figure 4 The multi-level handrail structure according to the embodiment of the present invention is schematically shown along Figure 3 Cross-sectional view of the AA area cut. Figure 5 This is a cross-sectional view schematically showing a state where the armrest is locked and a state where the ratchet fixing protrusion is inserted into the elastic member in the multi-stage armrest structure according to the embodiment of the present invention. Figure 6 This is a cross-sectional view schematically showing a state in which the armrest is unlocked and a state change of the ratchet fixing protrusion inserted into the elastic member in the multi-stage armrest structure according to the embodiment of the present invention. Figure 7 This is a cross-sectional view schematically showing a state in which the armrest is unlocked and a state in which the ratchet fixing protrusion is inserted into the elastic member in the multi-stage armrest structure according to the embodiment of the present invention. Figure 8 This is a cross-sectional view schematically showing a state in which an armrest is locked and a change in state of a ratchet fixing protrusion inserted into an elastic member in a multi-stage armrest structure according to an embodiment of the present invention.

[0061] Reference Figures 1 to 8 The multi-stage armrest structure 100 according to an embodiment of the present invention is constructed to include: a shaft 200 arranged on a seat (not shown); a shell 300 that rotatably sets the shaft 200 on the armrest 10; a bracket 400 fastened to the shaft 200; a ratchet 500 rotatably fastened to the bracket 400; a fan-shaped gear portion 600 fastened to the armrest 10 and meshing with the ratchet 500; and an elastic component 700 that applies elastic force to mesh the ratchet 500 with the fan-shaped gear portion 600.

[0062] Here, the elastic component 700 is arranged between the bracket 400 and the ratchet 500, and is configured to apply an elastic force in a rotational direction so that the ratchet gear teeth 520 formed on the ratchet 500 engage with the sector gear teeth 620 formed on the sector gear portion 600, while preventing the ratchet 500 from moving axially between the pair of brackets 400.

[0063] When the armrest 10 is rotated in the first direction within a certain angle range in the initial locking state, the ratchet wheel 500 is kept in meshing state with the sector gear portion 600 , so that the armrest 10 can be used at an angle, ie, a state, desired by the user.

[0064] Here, the first direction means Figure 3 The second direction represents the direction in which one end of the armrest 10 is rotated upward. Figure 3The direction in which one end of the armrest 10 is rotated toward the lower end is used as a reference.

[0065] When the armrest 10 is rotated in a first direction from a state where the armrest 10 is locked at a preset angle, the armrest 10 can be unlocked and rotated until it is almost upright and can be located parallel to the seat back. When the armrest 10 is rotated in a second direction from this state to an angle of the initial locked state of the armrest 10, the armrest 10 can be switched to the locked state again.

[0066] For such a movement, the armrest 10 is rotatably provided on the seat via the shaft 200 .

[0067] Furthermore, the shaft 200 is provided on the seat, and one side end is relatively rotatably provided on the armrest 10. The shaft 200 is rotatably fixed to the armrest 10 via the housing 300. The housing 300 is fastened to the armrest 10, and the other side end of the shaft 200 penetrates the housing 300. The housing 300 is configured to support the shaft 200 in a state of being provided on the armrest 10.

[0068] More specifically, the shaft 200 is constructed to include: a shaft body 210 which is provided on the seat by passing through a shaft through hole 310 formed on the shell 300; a flange portion 220 which is extended from the shaft body 210 in a radial direction with a diameter larger than that of the shaft through hole 310 and is in close contact with the shell 300; a bracket fastening portion 230 which is formed to protrude axially from the flange portion 220 and is embedded and fastened to shaft fastening holes 411, 421 formed on the bracket 400; and a rotating shaft 240 which is formed to protrude axially from the bracket fastening portion 230 and is inserted into the rotating hole 11 formed on the armrest 10 and is rotatably supported.

[0069] That is, the shaft 200 is constructed as follows: the rotating shaft 240 is rotatably inserted into the rotating hole 11 of the armrest 10, the shell 300 is fastened to the armrest 10, the shaft body 210 passes through the shaft through hole 310 of the shell 300 and protrudes to the outside of the shell 300, the flange portion 220 is in close contact with the inner side surface of the shell 300, and the armrest 10 is rotatably arranged on the shaft 200.

[0070] The bracket 400 is inserted into the bracket fastening portion 230 fastened to the shaft 200 , thereby being fastened and fixed to the shaft 200 .

[0071] The bracket 400 is formed as a pair. As an example, the bracket 400 may include a bracket body 410 and a bracket cover 420 coupled to the bracket body 410 .

[0072] The bracket body 410 is disposed on the inner circumference of the armrest 10 and is formed with a shaft fastening hole 411 for inserting and fastening the bracket fastening portion 230 of the shaft 200 and a hinge member fastening hole 412 for inserting the hinge member 430 . The ratchet 500 is rotatably fastened to the hinge member 430 .

[0073] The bracket cover 420 is configured to be in close contact with the flange portion 220 of the shaft 200, and the ratchet 500 is fastened to the bracket body 410 in a state of being inserted into the hinge member 430, so as to prevent the ratchet 500 from being detached in the axial direction. The bracket cover 420 is provided with 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 and fastened.

[0074] Here, the shaft fastening holes 411 and 421 are formed with concavoconvex shapes along the outer circumference, and the outer circumferential surface of the bracket fastening portion 230 of the shaft 200 is also formed with concavoconvex shapes of corresponding shapes, so as to be fastened and fixed to the shaft 200 in a non-rotatable manner.

[0075] The ratchet 500 is rotatably fastened to the hinge member 430, and the hinge member 430 is fastened to the pair of brackets 400. More specifically, the ratchet 500 includes: a ratchet body 510 inserted into the hinge member 430 and rotatably fastened; ratchet gear teeth 520 formed at the end of the ratchet body 510 and engaged with the sector gear teeth 620; and a ratchet fixing protrusion 530 protruding from one side of the ratchet body 510 and inserted and supported by the elastic member 700.

[0076] With such a configuration, when the ratchet 500 and the sector gear portion 600 are disposed opposite to each other, the ratchet gear teeth 520 can move along the sector gear teeth 620 in a state of meshing with the sector gear teeth 620 by means of the elastic force of the elastic member 700 .

[0077] The ratchet 500 is inserted into the hinge member 430 fastened to the bracket 400 and rotatably fastened, and the ratchet gear teeth 520 are engaged with the sector gear teeth 620 by the elastic force of the elastic member 700 .

[0078] The sector gear portion 600 is fastened to the armrest 10 to rotate together with the armrest 10 , and is configured to mesh with the ratchet wheel 500 .

[0079] More specifically, the fan-shaped gear portion 600 is constructed to include: a fan-shaped gear portion main body 610 fastened to the armrest 10; fan-shaped gear teeth 620 formed along the side of the fan-shaped gear portion main body 610 and engaged with the ratchet gear teeth 520; a first locking platform 630 formed at one end of the fan-shaped gear portion main body 610 and configured to lock one end of the ratchet body 510; and a second locking platform 640 formed at the other end of the fan-shaped gear portion main body 610 and configured to lock the other end of the ratchet body 510.

[0080] The sector gear body 610 is formed with a plurality of fastening parts 611. The sector gear body 610 is fastened to the housing 300 by fastening bolts 612 inserted through the fastening parts 611, the handrail groove 12 formed on the inner circumference of the handrail 10, and the housing hole 320 formed in the housing 300.

[0081] The sector gear teeth 620 are formed in a region longer than the ratchet gear teeth 520 , and the ratchet gear teeth 520 can move along the sector gear teeth 620 while being engaged with the sector gear teeth 620 .

[0082] Reference Figure 5 The initial locking state of the armrest 10 indicates that the ratchet gear teeth 520 are engaged with one end of the sector gear teeth 620. In addition, the armrest 10 is locked at a preset angle, indicating that the ratchet gear teeth 520 are engaged with the other end of the sector gear teeth 620.

[0083] The elastic component 700 is constructed to include a coupling portion 710, a groove portion 720 and a bending portion 730. The coupling portion 710 is coupled to the bracket 400. The ratchet fixing protrusion 530 is selectively inserted and supported in the groove portion 720. The bending portion 730 connects the coupling portion 710 and the groove portion 720, and provides an elastic restoring force to keep the coupling portion 710 and the groove portion 720 away from each other when they are close to each other.

[0084] With such a configuration, the elastic member 700 applies a rotational elastic force to the ratchet 500 so that the ratchet gear teeth 520 mesh with the sector gear teeth 620. Furthermore, the elastic restoring force of the curved portion 730 can prevent the ratchet 500 from axially moving between the pair of brackets 400.

[0085] The groove portion 720 is configured to include a first groove 721 and a second groove 722. The first groove 721 is configured to maintain the locked state of the armrest 10 when the ratchet fixing protrusion 530 is inserted. The second groove 722 is formed between the first groove 721 and the curved portion 730, and is configured to maintain the unlocked state of the armrest 10 when the ratchet fixing protrusion 530 is inserted. The first groove 721 and the second groove 722 are continuously formed, and the ratchet fixing protrusion 530 is configured to be able to move continuously along the first groove 721 and the second groove 722.

[0086] Reference Figures 5 to 7 The multi-stage handrail structure 100 according to an embodiment of the present invention can release the locked state of the hand 10 when the handrail 10 is rotated in the first direction.

[0087] When the armrest 10 is rotated in the first direction, after the ratchet gear teeth 520 move to the end of the fan-shaped gear teeth 620, the ratchet body 510 is locked to the first locking platform 630 and rotates, and the second groove 722 applies a restoring direction load of the bending portion 730 to the ratchet fixing protrusion 530, so that the ratchet fixing protrusion 530 is disengaged from the first groove 721 and inserted into the second groove 722.

[0088] More specifically, if Figure 5 As shown, in the initial locking state of the armrest 10, the armrest 10 is rotated in the first direction to move the ratchet gear teeth 520 from one end to the other end of the sector gear teeth 620, so that the armrest 10 can be locked at a preset angle. At this time, the ratchet fixing protrusion 530 is kept inserted into the first groove 721. The first groove 721 applies a restoring direction load to the ratchet fixing protrusion 530 in the rotation direction of the ratchet body 510, so that the locking state of the armrest 10 can be maintained.

[0089] Reference Figure 6 When the armrest 10 is locked at a preset angle, the armrest 10 is rotated in the first direction, and the ratchet body 510 is locked to the first locking platform 630 and rotates. In this case, the ratchet gear teeth 520 are disengaged from the sector gear teeth 620, and the locked state of the armrest 10 can be released.

[0090] At this time, the ratchet fixing protrusion 530 is rotated by the ratchet body 510 being locked to the first locking platform 630 and disengaged from the first groove 721 and inserted into the second groove 722. When the ratchet body 510 is locked to the first locking platform 630 and the ratchet fixing protrusion 530 is disengaged from the first groove 721, the second groove 722 applies a restoring direction load of the bent portion 730 to the ratchet fixing protrusion 530.

[0091] Reference Figure 7 The unlocked armrest 10 can be placed in the side storage position of the seat back. At this time, a stopper is formed inside the armrest 10 to limit the uppermost storage position of the armrest 10. The ratchet fixing protrusion 530 is kept in the state of being inserted into the second groove 722, and the ratchet body 510 can be kept in a non-rotating state.

[0092] On the other hand, refer to Figure 8 According to the multi-stage handrail structure 100 of an embodiment of the present invention, when the handrail 10 is rotated in the second direction, the ratchet body 510 is locked to the second locking platform 640 and rotates, and the first groove 721 applies a restoring direction load of the bending portion 730 to the ratchet fixing protrusion 530, so that the ratchet fixing protrusion 530 is disengaged from the second groove 722 and inserted into the first groove 721.

[0093] More specifically, Figure 7 When the armrest 10 in the unlocked state is rotated in the second direction to the extent that the ratchet body 510 is locked to the second locking platform 640, the ratchet body 510 is locked to the second locking platform 640 and rotates. At this time, the ratchet body 510 rotates without being interfered by the first locking platform 630.

[0094] When the ratchet body 510 is locked to the second locking stage 640 and rotated, the ratchet fixing protrusion 530 inserted into the second groove 722 is disengaged from the second groove 722. The ratchet fixing protrusion 530 disengaged from the second groove 722 receives the restoring direction load of the curved portion 730 from the first groove 721 and moves toward the first groove 721.

[0095] At this time, the ratchet gear teeth 520 mesh with one end of the sector gear teeth 620 , and the armrest 10 is in an initial locking state.

[0096] In summary, the present invention can provide a multi-stage handrail structure 100, which can adjust the locking state and unlocking state of the handrail 10 through an elastic component 700 including two grooves, and can reduce the number of components by simplifying the structure, thereby achieving lightweight.

[0097] The present invention has been described in detail above through specific embodiments, but these are only for the purpose of illustrating the present invention in detail, and the present invention is not limited thereto. It should be understood by those skilled in the art that various modifications and improvements can be made within the scope of the technical concept of the present invention.

[0098] Simple deformation and even modification of the present invention belong to the protection scope of the present invention, and the specific protection scope of the present invention should be interpreted according to the scope recorded in the claims.

Claims

1. A multi-level handrail structure, It is characterized in that include: The shaft is arranged on the seat, and one end of the shaft is relatively rotatably arranged on the armrest; a housing fastened to the handrail, the other end of the shaft passing through the housing, so that the housing supports the shaft in a state of being disposed on the handrail; A pair of brackets, fastened to the shaft; a ratchet wheel rotatably fastened to a hinge member fastened to the pair of brackets; A sector gear portion, fastened to the armrest to rotate together with the armrest and meshing with the ratchet wheel; as well as The elastic component is arranged between the bracket and the ratchet wheel, applies a rotational elastic force to make the ratchet gear teeth formed on the ratchet wheel mesh with the sector gear teeth formed on the sector gear part, and prevents the ratchet wheel from moving axially between the pair of brackets.

2. The multi-level handrail structure according to claim 1, It is characterized in that The ratchet comprises: A ratchet body rotatably fastened to the hinge member; ratchet gear teeth formed at an end of the ratchet body and meshing with the sector gear teeth; and The ratchet fixing protrusion is formed to protrude from one surface of the ratchet body and is inserted into and supported by the elastic member.

3. The multi-level handrail structure according to claim 2, It is characterized in that The elastic component comprises: A combining portion, combined with the bracket; a groove portion, wherein the ratchet fixing protrusion is selectively inserted into the groove portion to be supported; and The bent portion connects the coupling portion and the groove portion, and provides an elastic restoring force to move the coupling portion and the groove portion away from each other when the coupling portion and the groove portion are close to each other.

4. The multi-level handrail structure according to claim 3, It is characterized in that The sector gear portion comprises: A sector gear body, fastened to the armrest; Sector gear teeth are formed along the side of the sector gear portion body so as to mesh with the ratchet gear teeth; A first locking platform is formed at one end of the sector gear body and is configured to be locked by one end of the ratchet body; and The second locking platform is formed at the other end of the sector gear body and is configured to be locked with the other end of the ratchet body.

5. The multi-level handrail structure according to claim 4, It is characterized in that The groove portion comprises: a first groove configured to maintain a locked state of the armrest when the ratchet fixing protrusion is inserted; and The second groove is formed between the first groove and the bent portion, and is configured to maintain the armrest in an unlocked state when the ratchet fixing protrusion is inserted.

6. The multi-level handrail structure according to claim 5, It is characterized in that When the armrest is rotated in a first direction, After the ratchet gear teeth move to the end of the sector gear teeth, the ratchet body is locked to the first locking platform and rotates. The second groove applies a restoring direction load of the bent portion to the ratchet fixing protrusion, so that the ratchet fixing protrusion is disengaged from the first groove and inserted into the second groove.

7. The multi-level handrail structure according to claim 6, It is characterized in that When the armrest is rotated in the second direction, The ratchet body is locked to the second locking platform and rotates. The first groove applies a restoring direction load of the bent portion to the ratchet fixing protrusion, so that the ratchet fixing protrusion is disengaged from the second groove and inserted into the first groove.

8. The multi-level handrail structure according to claim 1, It is characterized in that The shaft comprises: The shaft body is installed on the seat by passing through the shaft through hole formed in the housing; A flange portion extending from the shaft body in a radial direction and having a larger diameter than the shaft through hole, and in close contact with the housing; a bracket fastening portion, formed to protrude in the axial direction from the flange portion, and inserted and fastened to the shaft fastening hole of the bracket; and The rotating shaft is formed to protrude in the axial direction from the fastening portion and is inserted into a rotating hole formed in the armrest to be rotatably supported.

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