Device for sequentially extending seat

Abstract

A device for sequentially extending a seat according to the present invention is installed on a mechanism that is provided with a seat member in order to allow a user to sit and is provided with a supporting member for supporting at least a portion of the lower body of the user sitting on the seat member. The device may comprise: a plurality of rotary extension units each provided with a body part for supporting at least a portion of the lower part of the supporting member, wherein one end of the body part is rotatably connected to one end of the body part of another rotary extension unit adjacent thereto, and the other end of the body part is rotatably connected to one end of the body part of still another rotary extension unit adjacent thereto; a plurality of supportable units respectively coupled to the plurality of rotary extension units; and a supporting unit which moves in a first supportable unit-direction toward the plurality of supportable units and supports at least some of the plurality of supportable units, thereby making the rotary extension units coupled to the supported supportable units unfold, or moves in a second supportable unit-direction opposite to the first supportable unit-direction and stops supporting the supportable units the supporting unit was supporting, thereby making the rotary extension units coupled to the unsupported supportable units bend.

Description

Sheet sequential extension device

[0001] The present invention relates to a seat sequential extension device, and more particularly, to a seat sequential extension device in which a plurality of rotational extensions are rotatably connected to each other to support a lower portion of a support member that supports at least a portion of the lower body of a user sitting on a seating member, and a plurality of supported members coupled to each of the plurality of rotational extensions or the plurality of rotational extensions are supported by the support members so that at least a portion of the rotational extensions is unfolded, thereby unfolding and extending the support member supported by the unfolded rotational extensions.

[0002]

[0003] Generally, a device equipped with a seating member for the user to sit on is called a chair, and this chair-shaped device is implemented in various ways, such as a sofa placed in a living room and a car seat placed in a car.

[0004] Recently, chairs (sofas, car seats) have been developed with a backrest to support the user's back or a support member to support the user's lower body to provide more comfort, and a reclining function to adjust the angle of the backrest or support member.

[0005] This reclining function automatically adjusts the angle of the backrest and support member according to the user's convenience. By reclining the backrest and lifting the support member, the user can comfortably rest while lying down.

[0006] For example, looking at the configuration of a conventional fully automatic recliner sofa, it is configured to include a leg frame formed at a certain interval, an armrest frame installed on the upper part of the leg frame, a fully automatic recliner body frame having a slide hole installed on each side of the leg frame, and a square floor support frame installed and fixed to the leg frame of the fully automatic recliner body frame to support the fully automatic recliner body frame (128). Through a combination of these configurations, the angles of the backrest and calf support of the sofa can be easily adjusted according to the user's body type or condition, thereby realizing the advantage of providing comfort to the user.

[0007] However, in the case of these conventional technologies, the frame supporting the calf support slides when operated by the control unit, and this noise is caused by friction, which has the problem of reducing the durability of the sofa itself.

[0008]

[0009] The purpose of the present invention is to provide a seat sequential extension device capable of extending and extending a support member that supports at least a portion of a lower body of a user sitting on a seating member by a plurality of rotatably connected rotary extensions, and wherein a plurality of supported members coupled to each of the plurality of rotary extensions or the plurality of rotary extensions are supported by the support members so that at least a portion of the rotary extensions is extended, thereby extending and extending the support member supported by the extended rotary extensions.

[0010] The objectives of the present invention are not limited to those mentioned above. Other objectives and advantages of the present invention not mentioned above can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0011]

[0012] A seat sequential extension device according to the present invention may be installed in a mechanism having a seating member for a user to sit on, and a support member for supporting at least a portion of a lower body of a user sitting on the seating member, the mechanism comprising: a body part for supporting at least a portion of a lower portion of the support member, one end of the body part being rotatably connected to the other end of the body part of another adjacent rotational extension part, and the other end of the body part being rotatably connected to one end of the body part of another adjacent rotational extension part; a plurality of supported parts coupled to each of the plurality of rotational extension parts; and a support part that moves in a first supported part direction toward the plurality of supported parts to support at least some of the supported parts among the plurality of supported parts, thereby allowing the rotational extension part coupled to the supported part to unfold, or moves in a second supported part direction opposite to the first supported part direction to unsupport the supported part, thereby allowing the rotational extension part coupled to the unsupported supported part to bend.

[0013] Preferably, the plurality of supporting portions have a first supporting protrusion formed protrudingly, and when the supporting portion moves in the direction of the first supporting portion or the direction of the second supporting portion, the first supporting protrusion can be crossed to support the plurality of supporting portions.

[0014] Preferably, the plurality of supporting parts further include a second supporting protrusion formed protruding from the lower portion of the first supporting protrusion,

[0015] Preferably, the support member can move between the second support protrusion and the first support protrusion when moved in the direction of the first support member or the direction of the second support member.

[0016] Preferably, the plurality of rotational extensions further include a first rotational fastening hole formed through one end of the body portion and a second rotational fastening hole formed through the other end of the body portion, and the sheet sequential extension device may further include a fastening member inserted into the first rotational fastening hole of one of the plurality of rotational extensions and the second rotational fastening hole of another rotational extension adjacent to the one of the rotational extensions to rotatably fasten the one of the rotational extensions and serving as a rotational axis of the one of the rotational extensions and the other of the rotational extensions.

[0017] Preferably, the plurality of rotational extensions further include a first rotational fastening hole formed through one end of the body portion and a second rotational fastening hole formed through the other end of the body portion, and the plurality of supported portions further include a third rotational fastening hole formed through one end and a fourth rotational fastening hole formed through the other end, and the sheet sequential extension device may further include a fastening member which is inserted into the first rotational fastening hole of one of the plurality of rotational extensions, the third rotational fastening hole of a supported portion disposed facing the one of the plurality of supported portions, the second rotational fastening hole of another of the rotational extensions adjacent to the one of the rotational extensions, and the fourth rotational fastening hole of another of the supported portions disposed facing the other of the rotational extensions, thereby rotatably fastening the one of the rotational extensions, the other of the rotational extensions, the supported portion, and the other of the supported portions, and which serves as a rotational axis of the one of the rotational extensions, the other of the rotational extensions, the supported portion, and the other of the supported portions.

[0018] Preferably, the sheet sequential extension device is configured such that, when a supported portion coupled with one of the plurality of rotational extensions and another supported portion coupled with another rotational extension adjacent to the one of the rotational extensions are not supported by the support portion, one end is rotatably connected to the body of one of the rotational extensions and the other end is rotatably connected to the body of the other of the rotational extensions so that an arrangement angle formed by the one of the rotational extensions and the other of the rotational extensions forms a preset reference angle,

[0019] Preferably, the support member and the other support member are supported by the support member, and when the arrangement angle exceeds the preset reference angle, an elastic member is relaxed and applies an elastic restoring force generated by the relaxation to the one of the rotational extension members and the other of the rotational extension members.

[0020] Preferably, the support member may be provided with a gear formed in a direction parallel to the direction of the first support member on the inner or outer side, a gear wheel that rotates by engaging with the gear wheel, and a motor that rotates the gear wheel.

[0021] A seat sequential extension device according to the present invention may be installed in a mechanism having a seating member for a user to sit on, and a support member for supporting at least a portion of a lower body of a user sitting on the seating member, the mechanism including a body part supporting at least a portion of a lower portion of the support member, one end of the body part being rotatably connected to the other end of the body part of another adjacent rotational extension part, and the other end of the body part being rotatably connected to one end of the body part of another adjacent rotational extension part; and a support part that moves in a first extension direction toward the plurality of rotational extensions to support at least some of the rotational extensions among the plurality of rotational extensions so that the supported rotational extensions are unfolded, or moves in a second extension direction opposite to the first extension direction to not support the rotational extensions that were being supported so that the unsupported rotational extensions are bent.

[0022] Preferably, the plurality of rotational extensions further include a first body protrusion formed protruding between one end of the body portion and the other end of the body portion, and when the support portion moves in the direction of the first extension portion or the direction of the second extension portion, the first body protrusion can be crossed to support the plurality of rotational extensions.

[0023] Preferably, the plurality of rotational extensions further include a second body protrusion formed by protruding from a lower portion of the first body protrusion between one end of the body portion and the other end of the body portion, and the support portion can move between the second body protrusion and the first body protrusion when moved in the direction of the first extension portion or the direction of the second extension portion.

[0024] Preferably, the plurality of rotational extensions further include a first rotational fastening hole formed through one end of the body portion and a second rotational fastening hole formed through the other end of the body portion, and the sheet sequential extension device may further include a fastening member inserted into the first rotational fastening hole of one of the plurality of rotational extensions and the second rotational fastening hole of another rotational extension adjacent to the one of the rotational extensions to rotatably fasten the one of the rotational extensions and serving as a rotational axis of the one of the rotational extensions and the other of the rotational extensions.

[0025] Preferably, the sheet sequential extension device may further include an elastic member, one end of which is rotatably connected to a body portion of one of the plurality of rotational extensions and the other end of which is rotatably connected to a body portion of the other rotational extension, such that when one of the rotational extensions and the other rotational extension adjacent to the one of the plurality of rotational extensions are not supported by the support portion, an arrangement angle formed by the one of the rotational extensions and the other rotational extension forms a preset reference angle, and when the one of the rotational extensions and the other rotational extension are supported by the support portion and the arrangement angle exceeds the preset reference angle, the elastic member is relaxed and applies an elastic restoring force generated by the relaxation to the one of the rotational extensions and the other rotational extension.

[0026] Preferably, the support may be provided with a gear formed in a direction parallel to the direction of the first extension on the inner or outer side, a gear wheel that rotates by engaging with the gear wheel, and a motor that rotates the gear wheel.

[0027] A seat sequential extension device according to the present invention is installed in a mechanism having a seating member for a user to sit on, and a support member for supporting at least a portion of a lower body of a user sitting on the seating member, the mechanism comprising: a body part for supporting at least a portion of a lower portion of the support member, one end of the body part being rotatably connected to the other end of the body part of another neighboring rotational extension part, and the other end of the body part being rotatably connected to one end of the body part of another neighboring rotational extension part; a plurality of shape memory alloy parts formed of a shape memory material, the one end and the other end of which are rotatably connected to two neighboring rotational extension parts among the plurality of rotational extension parts; and a deformation part for individually applying current or heat to each of the plurality of shape memory alloy parts to deform the shape of each of the plurality of shape memory alloy parts; wherein the plurality of rotational extension parts can be unfolded or bent by changing an angle formed by two neighboring rotational extension parts according to the deformation of the shape of the plurality of shape memory alloy parts.

[0028] Preferably, the plurality of rotational extensions further include a first rotational fastening hole formed through one end of the body portion and a second rotational fastening hole formed through the other end of the body portion, and the sheet sequential extension device may further include a fastening member inserted into the first rotational fastening hole of one of the plurality of rotational extensions and the second rotational fastening hole of another rotational extension adjacent to the one of the rotational extensions to rotatably fasten the one of the rotational extensions and serving as a rotational axis of the one of the rotational extensions and the other of the rotational extensions.

[0029] Preferably, the plurality of rotational extensions further have a fixing hole formed through between one end and the other end of the body portion, the plurality of shape memory alloy parts have a first fixing ring formed in a ring shape at one end and a second fixing ring formed in a ring shape at the other end, and the sheet sequential extension device may further include a plurality of fixing members inserted into the fixing hole of one of the plurality of rotational extensions, the first fixing ring of the shape memory alloy part whose one end is connected to one of the rotational extensions, and the second fixing ring of the other shape memory alloy part whose other end is connected to one of the rotational extensions.

[0030] Preferably, the plurality of shape memory alloy parts are deformed so that the arrangement angle formed by two adjacent rotational extensions is varied within a variation angle range, and the two adjacent rotational extensions are spread out so as to be arranged on the same straight line when the arrangement angle is varied to a maximum angle within the variation angle range, and are bent when the arrangement angle is varied to an angle other than the maximum angle within the variation angle range.

[0031] Preferably, when an unfolding control signal for unfolding the plurality of rotational extensions is input, the deformation unit may apply current or heat to the plurality of shape memory alloy parts, and when a bending control signal for bending the plurality of rotational extensions is input, the deformation unit may not apply current or heat to the plurality of shape memory alloy parts.

[0032] Preferably, the sheet sequential extension device may further include a plurality of elastic members, one end of which is fastened to the fastening member, the other end of which is fastened to the shape memory alloy portion, and which are relaxed when the fastening member and the shape memory alloy portion are separated according to the arrangement angle between the rotational extension portions to apply an elastic restoring force to the fastening member and the shape memory alloy portion.

[0033]

[0034] According to the present invention, a lower portion of a support member that supports at least a portion of the lower body of a user sitting on a seating member is supported by a plurality of rotational extensions that are rotatably coupled to each other, and a plurality of supported portions coupled to each of the plurality of rotational extensions or the plurality of rotational extensions are supported by the support member so that at least a portion of the rotational extensions is unfolded, thereby unfolding and extending the support member supported by the unfolded rotational extensions.

[0035]

[0036] FIG. 1 is a perspective view of a sheet sequential extension device according to a first embodiment of the present invention.

[0037] Figure 2 is a left side view of a sheet sequential extension device according to a first embodiment of the present invention.

[0038] Figure 3 is a right side view of a sheet sequential extension device according to the first embodiment of the present invention.

[0039] Figure 4 is a left-side isolated perspective view of a sheet sequential extension device according to a first embodiment of the present invention.

[0040] Figure 5 is a right-side exploded perspective view of a sheet sequential extension device according to a first embodiment of the present invention.

[0041] FIG. 6 is a left side view of a sheet sequential extension device according to a first embodiment of the present invention with a plurality of rotation extension parts unfolded.

[0042] FIG. 7 is a perspective view of a chair, which is a mechanism in which a seat sequential extension device according to the first embodiment of the present invention is installed.

[0043] FIG. 8 is a bottom perspective view of a chair, which is a mechanism having a seat sequential extension device installed according to the first embodiment of the present invention.

[0044] FIG. 9 is a bottom perspective view of a chair in which the support member is unfolded by a sheet sequential extension device according to the first embodiment of the present invention.

[0045] FIG. 10 is a bottom perspective view of a chair, which is a mechanism in which two seat sequential extension devices according to the first embodiment of the present invention are installed.

[0046] Fig. 11 is a perspective view of a support according to a second embodiment of the present invention.

[0047] FIG. 12 is a perspective view of a plurality of rotational extension parts according to a second embodiment, a plurality of support parts according to a second embodiment, and a support part according to a third embodiment included in a sheet sequential extension device according to the present invention.

[0048] FIG. 13 is a left side view of a plurality of rotational extension parts according to a second embodiment and a plurality of support parts according to the second embodiment included in a sheet sequential extension device according to the present invention in a state in which they are unfolded by a support part according to a third embodiment.

[0049] FIG. 14 is a perspective view of a plurality of rotary extension members according to a third embodiment and a support member according to a third embodiment included in a sheet sequential extension device according to a third embodiment of the present invention.

[0050] FIG. 15 is a left side view of a plurality of rotary extensions according to a third embodiment included in a sheet sequential extension device according to a third embodiment of the present invention, unfolded by a support member according to the third embodiment.

[0051] Fig. 16 is a perspective view of a sheet sequential extension device according to a fourth embodiment of the present invention.

[0052] Fig. 17 is a left side view of a sheet sequential extension device according to a fourth embodiment of the present invention.

[0053] Fig. 18 is a right side view of a sheet sequential extension device according to a fourth embodiment of the present invention.

[0054] Fig. 19 is a left-side separated perspective view of a sheet sequential extension device according to a fourth embodiment of the present invention.

[0055] Figure 20 is a right-side exploded perspective view of a sheet sequential extension device according to a fourth embodiment of the present invention.

[0056] Figure 21 is a left side view of a sheet sequential extension device according to a fourth embodiment of the present invention with a plurality of rotation extension parts unfolded.

[0057] Fig. 22 is a perspective view of a chair, which is a mechanism in which a seat sequential extension device according to a fourth embodiment of the present invention is installed.

[0058] FIG. 23 is a bottom perspective view of a chair, which is a mechanism having a seat sequential extension device installed according to a fourth embodiment of the present invention.

[0059] FIG. 24 is a bottom perspective view of a chair in which the support member is unfolded by a seat sequential extension device according to a fourth embodiment of the present invention.

[0060] FIG. 25 is a bottom perspective view of a chair, which is a mechanism in which two seat sequential extension devices according to the fourth embodiment of the present invention are installed.

[0061] Fig. 26 is a perspective view of a sheet sequential extension device according to a fifth embodiment of the present invention.

[0062] Figure 27 is a left side view of a sheet sequential extension device according to a fifth embodiment of the present invention with a plurality of rotation extension parts unfolded.

[0063]

[0064] Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that the present invention includes various modifications, equivalents, and / or alternatives of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar components.

[0065] In this document, the expressions "have", "may have", "include", or "may include" indicate the presence of a feature (e.g., a number, function, operation, or component such as a part), but do not exclude the presence of additional features.

[0066] In this document, the expressions "A or B", "at least one of A and / or B", or "one or more of A and / or B" can include all possible combinations of the items listed together. For example, "A or B", "at least one of A and B", or "at least one of A or B" can all refer to cases where (1) at least one A is included, (2) at least one B is included, or (3) at least one A and at least one B are included.

[0067] The terms "first," "second," "first," or "second" used herein can describe various components, regardless of order and / or importance, and are only used to distinguish one component from another, without limiting the components. For example, "first orderer device" and "second orderer device" can refer to different orderer devices, regardless of order or importance. For example, without departing from the scope of the rights set forth in this document, "first component" could be referred to as "second component," and similarly, "second component" could also be referred to as "first component."

[0068] When it is said that a component (e.g., a first component) is "(operatively or communicatively) coupled with / to" or "connected to" another component (e.g., a second component), it should be understood that said component is directly coupled to / to the other component, or may be connected via another component (e.g., a third component). Conversely, when it is said that a component (e.g., a first component) is "directly coupled to" or "directly connected to" another component (e.g., a second component), it should be understood that no other component (e.g., a third component) exists between said component and said other component.

[0069] The expression "configured to" as used herein can be used interchangeably with, for example, "suitable for", "having the capacity to", "designed to", "adapted to", "made to", or "capable of", depending on the context. The term "configured to" does not necessarily mean something is "specifically designed to" in terms of hardware. Instead, in some contexts, the expression "a device configured to" can mean that the device, together with other devices or components, is "capable of". For example, the phrase "a processor configured (or set) to perform A, B, and C" can mean a dedicated processor (e.g., an embedded processor) for performing those operations, or a general-purpose processor (e.g., a CPU or application processor) that can perform those operations by executing one or more software programs stored in memory.

[0070] In particular, in this specification, “~device” may include one or more of a Central Processing Unit (CPU), an Application Processor (AP), and a Communication Processor (CP).

[0071] In this specification, “~device” means any type of hardware device including at least one processor, and may be understood to encompass a software configuration operating on the hardware device according to an embodiment.

[0072] The terms used in this document are used only to describe specific embodiments and may not be intended to limit the scope of other embodiments. The singular expression may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the art described in this document. Terms defined in general dictionaries among the terms used in this document may be interpreted as having the same or similar meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined in this document. In some cases, even if a term is defined in this document, it cannot be interpreted to exclude embodiments of this document.

[0073] FIG. 1 is a perspective view of a seat sequential extension device according to a first embodiment of the present invention, FIG. 2 is a left side view of a seat sequential extension device according to a first embodiment of the present invention, FIG. 3 is a right side view of a seat sequential extension device according to a first embodiment of the present invention, FIG. 4 is a left side isolated perspective view of a seat sequential extension device according to a first embodiment of the present invention, FIG. 5 is a right side isolated perspective view of a seat sequential extension device according to a first embodiment of the present invention, FIG. 6 is a left side view of a seat sequential extension device according to a first embodiment of the present invention in a state where a plurality of rotational extension parts are unfolded, FIG. 7 is a perspective view of a chair as a mechanism on which a seat sequential extension device according to a first embodiment of the present invention is installed, FIG. 8 is a bottom perspective view of a chair as a mechanism on which a seat sequential extension device according to a first embodiment of the present invention is installed, and FIG. 9 is a bottom perspective view of a chair in a state where a support member is unfolded by a seat sequential extension device according to a first embodiment of the present invention, and FIG. 8 is a bottom perspective view of a chair as a mechanism on which a seat sequential extension device according to a first embodiment of the present invention is installed. A bottom perspective view of a chair having a seat sequential extension device installed according to an example, and FIG. 9 is a bottom perspective view of a chair in a state where a support member is unfolded by a seat sequential extension device according to a first embodiment of the present invention.

[0074] Referring to FIGS. 1 to 9, a seat sequential extension device (100) according to a first embodiment of the present invention can be installed in a device (1) provided with a seating member (1-1) for a user to sit on, and a support member (1-2) for supporting at least a portion of the lower body of a user sitting on the seating member (1-1).

[0075] Such a device (1, hereinafter referred to as “chair”) may be any one of an office chair, a home chair, an armchair with a recliner function, a sofa, and a car seat.

[0076] Specifically, the support member (1-2) can support at least a portion of the body below the knees of a user sitting on the seating member (1-1). For example, the support member (1-2) can be a calf support.

[0077] For this purpose, one end of the seating member (1-1) is in contact with the backrest of the chair (1), and one end of the support member (1-2) is in contact with the other end of the seating member (1-1) or may extend from the other end of the seating member (1-1).

[0078] These support members (1-2) can be formed of a flexible material so that they can be bent or unfolded depending on whether the lower part is supported.

[0079] At this time, the seat sequential extension device (100) according to the first embodiment of the present invention can be installed on the chair (1) so that the support member (1-2) can be bent as shown in FIGS. 7 and 8 or unfolded as shown in FIG. 9.

[0080] To this end, the sheet sequential extension device (100) according to the first embodiment may include a plurality of rotation extension parts (110), a plurality of support parts (120), a support part (130), a fastening member (140), an elastic member (150), and a fixing member (160).

[0081] The plurality of rotation extensions (110) may have a body portion (111) that supports at least a portion of the lower portion of the support member (1-2).

[0082] The shape of this body part (111) is not limited, but is shaped like a flat plate and is arranged perpendicular to the support member (1-2) so that the corners are in contact with the lower part of the support member (1-2) and can support the lower part of the support member (1-2).

[0083] Meanwhile, the body part (111) can be rotatably connected to an adjacent body part (111).

[0084] Specifically, among the plurality of rotation extensions (110), one rotation extension (110, 110b) may be rotatably connected to one end of the body (111) of another adjacent rotation extension (110, 110a) so that one end of the body (111) can be rotatably connected to one end of the body (111) of another adjacent rotation extension (110, 110c).

[0085] To this end, each of the plurality of rotation extensions (110) may further include a first rotation fastening hole (112) formed through one end and a second rotation fastening hole (113) formed through the other end.

[0086] At this time, the fastening member (140) can be sequentially inserted into the first fastening hole (112) of the body part (111) of one of the plurality of rotating extensions (110) and the second fastening hole (113) of the body part (111) of another rotating extension (110a) adjacent to one of the rotating extensions (110, 110b) to rotatably fasten one of the rotating extensions (110, 110b) and the other rotating extension (110, 110a).

[0087] Additionally, the fastening member (140) can become a rotation axis when one rotation extension (110b) and the other rotation extension (110a) are rotated.

[0088] That is, a plurality of rotation extensions (110) are sequentially connected one by one, and a connection member (140) is inserted into each of two neighboring rotation extensions (110), and the two neighboring rotation extensions (110) can be rotated with the connection member (140) as the rotation axis.

[0089] Accordingly, the plurality of rotation extensions (110) can be mutually connected in a structure that bends or unfolds like a joint when an external force is applied.

[0090] Meanwhile, the above-described fastening member (140) can be formed in a bolt shape.

[0091] Meanwhile, a fixing hole (114) through which an elastic member (150) is fixed can be formed between one end and the other end of the body (111) of the plurality of rotating extensions (110).

[0092] A fixing member (160) is inserted into the fixing hole (114), and an elastic member (150) can be fixed to the fixing member (160) inserted into the fixing hole (114).

[0093] The fixing method of the fixing hole (114), fixing member (160), and elastic member (150) will be described later.

[0094] FIG. 12 is a perspective view of a plurality of rotational extension parts according to a second embodiment, a plurality of support parts according to a second embodiment, and a support part according to a third embodiment included in a sheet sequential extension device according to the present invention.

[0095] Referring further to FIG. 12, the plurality of rotation extensions (110') according to the second embodiment may have a difference only in that the fixing hole (114) is not formed through the body portion (111') compared to the plurality of rotation extensions (110) according to the first embodiment.

[0096] In addition, the body part (111') of the plurality of rotation extensions (110') according to the second embodiment does not have a fixing hole (114), so that it can be formed as a plate having an area and shape through which the first rotation fastening hole (112) and the second rotation fastening hole (113) can be formed.

[0097] That is, the body part (111) of the plurality of rotation extensions (110) according to the first embodiment is formed as a plate having a triangular shape with a rounded vertex by forming not only the first rotation fastening hole (112) and the second rotation fastening hole (113) but also the fixing hole (114) through the first rotation fastening hole (112) and the second rotation fastening hole (113) through the second embodiment, but the body part (111) of the plurality of rotation extensions (110) according to the second embodiment is formed as a plate having a square shape with one end and the other end rounded by forming only the first rotation fastening hole (112) and the second rotation fastening hole (113) through the first rotation fastening hole (112) and the second rotation fastening hole (113).

[0098] Meanwhile, since the body part (111') of the plurality of rotational extension parts (110') according to the second embodiment does not have a fixing hole (114), the sheet sequential extension device (100) including the plurality of rotational extension parts (110') according to the second embodiment may not include the elastic member (150) and the fixing member (160) that fixes the elastic member (150), unlike the sheet sequential extension device (100) according to the first embodiment including the plurality of rotational extension parts (110), the plurality of supported parts (120), the support part (130), the fastening member (140), the elastic member (150), and the fixing member (160).

[0099] Referring again to FIGS. 1 to 9, each of a plurality of supporting members (120) can be coupled to a plurality of rotating extension members (110) according to the first embodiment.

[0100] To explain again, one support member (120) can be coupled to one rotation extension member (110).

[0101] The support member (120) according to the first embodiment may be formed in a plate shape and may be provided with a third rotation fastening hole (123) formed through one end and a fourth rotation fastening hole (124) formed through the other end to be coupled to the rotation extension member (110).

[0102] At this time, when the supported part (120) is coupled to the rotation extension part (110), the fastening member (140) is coupled to the first rotation fastening hole (112) of the body part (111) of one of the rotation extension parts (110, 110b) among the plurality of rotation extension parts (110) and the second rotation fastening hole (113) of the body part (111) of another rotation extension part (110, 110a) adjacent to one of the rotation extension parts (110b), the third rotation fastening hole (123) of the supported part (120, 120b) coupled to one of the rotation extension parts (110, 110b) among the plurality of supported parts (120) and the fourth rotation fastening hole (123) of another supported part (120, 120a) adjacent to the supported part (120, 120b) and coupled to another rotation extension part (110, 110a). One of the rotational extension parts (110, 110b) and the support part (120, 120b) that are sequentially inserted into the fastening hole (124) and mutually coupled can be rotatably coupled with another rotational extension part (110, 110a) and another support part (120, 120a) that are mutually coupled.

[0103] Additionally, the fastening member (140) can become a rotation axis when one of the rotation extensions (110, 110b), the supported portion (120, 120b), the other rotation extension (110, 110a), and the other supported portion (120, 120a) rotates.

[0104] That is, a plurality of rotation extension parts (110) are connected one by one in succession, and a plurality of support parts (120) connected one by one in succession are further connected one to one, and can be rotated with the connection member (140) as the rotation axis.

[0105] Accordingly, the plurality of rotation extensions (110) and the plurality of support members (120) can be mutually connected in a structure that bends or unfolds like a joint when an external force is applied.

[0106] Meanwhile, the support portion (120) according to the first embodiment may have a first support protrusion (121) that is formed protruding.

[0107] This first supporting protrusion (121) may be a plate that is vertically protruded near the upper edge of the supporting portion (120) which is a plate shape.

[0108] At this time, the first support protrusion (121) can have its lower surface supported by the support portion (130) moved downward.

[0109] The support member (130) can move in the first supported portion direction toward the plurality of supported portions (120) to support at least some of the supported portions (120) among the plurality of supported portions (120) so that the rotational extension member (110) coupled with the supported supported portions (120) can be unfolded, or can move in the second supported portion direction opposite to the first supported portion direction so that the supported supported portions (120) are not supported so that the rotational extension member (110) coupled with the unsupported supported portions (120) are bent.

[0110] This support member (130) is formed in a rod shape and, when positioned at the bottom of the seating member (1-1) and moves in the direction of the first supported member, the tip is positioned from the bottom of the first supported protrusion (121) of the supported member (120) closest to the seating member (1-1) among the plurality of supported members (120), and the tip can sequentially move to the bottom of the first supported protrusion (121) of the neighboring supported members (120).

[0111] Accordingly, the first support protrusion (121) supported by the support member (130) forming a straight line is arranged on the same straight line, and the rotation extensions (110) coupled with the support member (120) of the first support protrusion (121) supported by the support member (130) can also be spread out to form a straight line.

[0112] Accordingly, the support member (1-2) whose lower surface is supported by the rotating extensions (110) that are spread out in a straight line can also be spread out to form a flat surface.

[0113] For example, when the support member (130) moves as far as possible in the direction of the first supported member to the lower part of the first supported protrusion (121) of the supported member (120) that is farthest from the seating member (1-1), all of the first supported protrusions (121) are supported at the lower part by the support member (130) to form a straight line, and thus all of the plurality of supported members (120) also unfold to form a straight line, and due to this, all of the plurality of rotational extensions (110) also unfold to form a straight line, and finally, the support member (1-2) can also unfold so that all areas form a flat surface.

[0114] Thereafter, when the support member (130) moves in the direction of the second supported member, which is opposite to the direction of the first supported member, the first supported protrusions (121) supported by the support member (130) are released from support by the support member (130) in the order of distance from the seating member (1-1), and as a result, the supported member (120) not supported by the first supported protrusion (121) is bent by rotating downwards (in the direction of gravity) due to gravity, and the rotational extension (110) coupled with the bent supported member (120) is also bent by rotating downwards (in the direction of gravity), and finally, the area of ​​the support member (1-2) supported by the bent rotational extension (110) can be bent.

[0115] Meanwhile, the support member (130) may be formed in a rod shape, and may be provided with teeth (133) formed in a direction parallel to the first support direction on the outer lower surface in order to move in the direction of the first support member or the second support member, a gear wheel (134) that rotates by engaging with the gear wheel (133), and a motor that rotates the gear wheel.

[0116] In addition, the support member (130) further has a support protrusion (131) formed by protruding from the first side, and when the support member (130) is moved to the supported member (120), the support protrusion (131) is positioned below the first supported protrusion (121) and can support the first supported protrusion (121).

[0117] Additionally, the support member (130) may have a mounting groove (132) formed into the second side. A mounting wire may be inserted into the mounting groove (132) and mounted on the mounting wire. Here, the mounting wire may be fixed to the lower surface of the seating member (1-1).

[0118] That is, the support member (130) can be positioned at the bottom of the seating member (1-1) while being movable in the direction of the first support member or the second support member by being mounted on a mounting wire through a mounting groove (132) formed on the second side.

[0119] Meanwhile, the plurality of supporting parts (120) may further include a second supporting protrusion (122) formed protruding from below the first supporting protrusion (121).

[0120] At this time, the support member (130), i.e., the support protrusion member (131), can be moved between the first support protrusion member (121) and the second support protrusion member (122).

[0121] That is, the support protrusion (131) is positioned on the upper side of the first support protrusion (121) to support the lower part of the first support protrusion (121), and is positioned on the upper side of the second support protrusion (122) to be guided from the second support protrusion (122).

[0122] Meanwhile, the support member (120) according to the second embodiment is formed in a plate shape and can be joined to face one surface of the rotation extension member (110) to be joined.

[0123] More specifically, the support member (120) according to the second embodiment does not have a third rotation fastening hole (123) and a fourth rotation fastening hole (124), and can be coupled between the first rotation fastening hole (112) and the second rotation fastening hole (113) of the coupled rotation extension member (110).

[0124] That is, the support member (120) according to the second embodiment is not fastened to the rotation extension member (110) through the fastening member (140), but can be joined by making surface contact with the rotation extension member (110) through a process such as welding.

[0125] The support member (120) according to the second embodiment may also, like the support member (120) according to the first embodiment, have only the first support protrusion (121) or may have both the first support protrusion (121) and the second support protrusion (122).

[0126] Meanwhile, when the elastic member (150) is coupled with one of the plurality of rotational extensions (110) and the supported member (120, 120b) coupled with another rotational extension (110, 110a) adjacent to one of the rotational extensions (110, 110b) and the other supported member (120, 120a) coupled with the other rotational extension (110, 110a) is not supported by the support member (130), one end may be rotatably coupled with the body part (111) of one of the rotational extensions (110, 110b) and the other end may be rotatably coupled with the body part (111) of the other rotational extension (110, 110a) so that the arrangement angle formed by one of the rotational extensions (110, 110b) and the other rotational extension (110, 110a) forms a preset reference angle.

[0127] At this time, the elastic member (150) may be rotatably fastened to a fixing member (160) inserted into a fixing hole (114) of a body part (111) of one of the rotational extension parts (110, 110b) at one end, and may be rotatably fastened to a fixing member (160) inserted into a fixing hole (114) of a body part (111) of another rotational extension part (110, 110a) at the other end.

[0128] To this end, the elastic member (150) is positioned such that a coil having elasticity is wound around a wire at a stop, and two straight wires extending from the coil of the stop are positioned, and a circular wire is positioned at one end, which is the end of one straight wire, and another circular wire is positioned at the other end, which is the end of the other straight wire.

[0129] At this time, a fixing member (160) is inserted into the inside of each circular wire so that the elastic member (150) can be fastened to the rotation extension (110).

[0130] Such elastic member (150) is relaxed when the supported portion (120, 120b) and another supported portion (120, 120a) are supported by the support portion (130) and the arrangement angle exceeds a preset reference angle, and the elastic restoring force generated by the relaxation can be applied to one of the rotational extension portions (110, 110b) and the other rotational extension portion (110, 110a).

[0131] FIG. 10 is a bottom perspective view of a chair, which is a mechanism in which two seat sequential extension devices according to the first embodiment of the present invention are installed.

[0132] As illustrated in Fig. 10, a plurality of seat sequential extension devices (100) can be installed on a chair. Thus, even if a heavy object is positioned on top of the support member (1-2), the support member (1-2) can be supported and extended by the plurality of seat sequential extension devices (100).

[0133] Fig. 11 is a perspective view of a support according to a second embodiment of the present invention.

[0134] Referring to FIG. 11, the support member (130') according to the second embodiment may have two support protrusions (131) formed by protruding from each of the two sides.

[0135] Accordingly, the sheet sequential extension device (100) including the support member (130') according to the second embodiment may include two sets of extension modules each composed of a plurality of rotational extension members (110), a plurality of supported members (120), a support member (130), a fastening member (140), an elastic member (150), and a fixing member (160).

[0136] That is, among the two sets of extension modules, one set of extension modules can be supported and unfolded by a support protrusion (131) protruding from the first side of the support member (130'), and one set of extension modules can be supported and unfolded by a support protrusion (131) protruding from the second side of the support member (130').

[0137] In other words, the support member (130') according to the second embodiment has a plurality of support protrusions (131) so that a plurality of sets of extension modules can be unfolded.

[0138] At this time, the implementation example can be changed as long as the extension module is unfolded or bent by the support (130').

[0139] For example, the extension module may not include an elastic member (150), may not include a plurality of support portions (120) that have a second support protrusion (122), or may include a plurality of rotational extension portions (110) that do not have a fixing hole (114).

[0140] FIG. 12 is a perspective view of a plurality of rotational extension parts according to a second embodiment, a plurality of supported parts according to a second embodiment, and a support part according to a third embodiment included in a sheet sequential extension device according to the present invention, and FIG. 13 is a left side view of a state in which a plurality of rotational extension parts according to a second embodiment and a plurality of supported parts according to a second embodiment included in a sheet sequential extension device according to the present invention are unfolded by a support part according to a third embodiment.

[0141] Referring to FIGS. 12 and 13, the support member (130”) according to the third embodiment is formed in a hollow rod shape, and may be provided with a gear (133') formed on the upper surface of the inner space, and a gear wheel (134') arranged in the inner space and rotated by engaging with the gear (133').

[0142] That is, unlike the support (130) according to the first embodiment and the support (130') according to the second embodiment, the support (130”) according to the third embodiment can have teeth and gear wheels formed in the inner space.

[0143] Accordingly, the support member (130”) according to the third embodiment can be moved directly below the first support protrusion (121) or the support protrusion (131') formed by protruding from the first side can be moved.

[0144] FIG. 14 is a perspective view of a plurality of rotational extensions according to a third embodiment and a support according to a third embodiment included in a sheet sequential extension device according to a third embodiment of the present invention, and FIG. 15 is a left side view of a plurality of rotational extensions according to a third embodiment included in a sheet sequential extension device according to a third embodiment of the present invention in a state in which the plurality of rotational extensions according to a third embodiment are unfolded by a support according to the third embodiment.

[0145] Referring further to FIGS. 14 and 15, the plurality of rotation extensions (110') according to the second embodiment may have a first body extension (115) protrudingly formed between one end and the other end of the body portion (111”).

[0146] This first body extension (115) may be a plate that is formed to protrude vertically near the upper edge of the body portion (111”) of the plurality of rotation extensions (110') according to the second embodiment, which is a plate shape.

[0147] At this time, the lower surface of the first body extension (115) can be supported by the support (130”) that has been moved downward. Here, the support (130”) that has been moved downward to support the lower surface of the first body extension (115) may be the support (130) according to the first embodiment described above as well as the third embodiment and the support (130') according to the second embodiment.

[0148] Meanwhile, the support member (130”) may move in a direction toward the first body extension member (115) to support the first body extension member (115), thereby allowing the plurality of rotational extension members (110') according to the second embodiment to unfold, or may move in a direction opposite to the direction toward the first body extension member (115) to not support the first body extension member (115) that was being supported, thereby allowing the rotational extension member (110') of the unsupported first body extension member (115) to bend.

[0149] FIG. 16 is a perspective view of a seat sequential extension device according to a fourth embodiment of the present invention, FIG. 17 is a left side view of a seat sequential extension device according to a fourth embodiment of the present invention, FIG. 18 is a right side view of a seat sequential extension device according to a fourth embodiment of the present invention, FIG. 19 is a left side isolated perspective view of a seat sequential extension device according to a fourth embodiment of the present invention, FIG. 20 is a right side isolated perspective view of a seat sequential extension device according to a fourth embodiment of the present invention, FIG. 21 is a left side view of a seat sequential extension device according to a fourth embodiment of the present invention in a state where a plurality of rotational extension parts are unfolded, FIG. 22 is a perspective view of a chair as a mechanism on which a seat sequential extension device according to a fourth embodiment of the present invention is installed, FIG. 23 is a bottom perspective view of a chair as a mechanism on which a seat sequential extension device according to a fourth embodiment of the present invention is installed, and FIG. 24 is a bottom perspective view of a chair in a state where a support member is unfolded by a seat sequential extension device according to a fourth embodiment of the present invention, and FIG. 25 is a bottom perspective view of a chair, which is a mechanism in which two seat sequential extension devices according to the fourth embodiment of the present invention are installed.

[0150] Referring to FIGS. 16 to 24, a seat sequential extension device (1000) according to a fourth embodiment of the present invention can be installed in a device (1, the above-described 'chair') that is provided with a seating member (1-1) for a user to sit on, and a support member (1-2) for supporting at least a portion of the lower body of a user sitting on the seating member (1-1).

[0151] At this time, the seat sequential extension device (1000) according to the fourth embodiment of the present invention can be installed on the chair (1) so that the support member (1-2) can be bent as shown in FIGS. 22 and 23 or unfolded as shown in FIG. 24.

[0152] To this end, the sheet sequential extension device (1000) according to the fourth embodiment may include a plurality of rotation extension parts (1100), a plurality of shape memory alloy parts (1200), a deformation part (not shown), a fastening member (1300), a fixing member (1400), and an elastic member (1500).

[0153] The plurality of rotation extensions (1100) may have a body portion (1110) that supports at least a portion of the lower portion of the support member (1-2).

[0154] The shape of this body part (1110) is not limited, but is shaped like a flat plate and is arranged perpendicular to the support member (1-2) so that the corners contact the lower part of the support member (1-2) and can support the lower part of the support member (1-2).

[0155] Meanwhile, the body part (1110) can be rotatably connected to an adjacent body part (1110).

[0156] Specifically, among the plurality of rotation extensions (1100), one rotation extension (1100, 1100b) may be rotatably connected to one end of the body (1110) of another adjacent rotation extension (1100, 1100a) so that the other end of the body (1110) may be rotatably connected to one end of the body (1110) of another adjacent rotation extension (1100, 1100c).

[0157] To this end, each of the plurality of rotation extensions (1100) may further include a first rotation fastening hole (1120) formed through one end and a second rotation fastening hole (1130) formed through the other end.

[0158] At this time, the fastening member (1300) can be sequentially inserted into the first fastening hole (1120) of the body part (1110) of one of the plurality of rotating extensions (1100, 1100b) and the second fastening hole (1130) of the body part (1110) of another rotating extension (110a) adjacent to one of the rotating extensions (1100, 1100b) to rotatably fasten one of the rotating extensions (1100, 1100b) and the other rotating extension (1100, 1100a).

[0159] Additionally, the fastening member (1300) can become a rotation axis when one rotation extension (1100b) and the other rotation extension (1100a) are rotated.

[0160] That is, a plurality of rotation extensions (1100) are sequentially connected one by one, and a connection member (1300) is inserted into each of two neighboring rotation extensions (1100), and the two neighboring rotation extensions (1100) can be rotated with the connection member (1300) as the rotation axis.

[0161] Accordingly, the plurality of rotation extensions (1100) can be mutually connected in a structure that bends or unfolds like a joint when an external force is applied.

[0162] Meanwhile, the above-described fastening member (1300) can be formed in a bolt shape.

[0163] Meanwhile, the body part (1110) of the plurality of rotating extensions (1100) may have a fixing hole (1140) formed through which two shape memory alloy parts (1200) are rotatably connected between one end and the other end.

[0164] A fixing member (1400) is inserted into the fixing hole (1140), and two shape memory alloy parts (1200) adjacent to the fixing member (1400) inserted into the fixing hole (1140) can be fixed.

[0165] This shape memory alloy part (1200) is formed of a shape memory material, and can be connected to two adjacent rotational extension parts (1100a, 1100b) among a plurality of rotational extension parts (1100) so that one end and the other end can rotate, respectively.

[0166] Specifically, the shape memory alloy part (1200) may be formed by joining two long bars to form a predetermined bending angle, and may include a first fixing ring formed in a ring shape at one end of one of the two bars, and a second fixing ring formed in a ring shape at the other end of the other bar.

[0167] At this time, one shape memory alloy part (1200) may be inserted into the first fixing ring of one end of the fixing member (1400) inserted into the fixing hole (1140) of one of the two adjacent rotation extensions (1100), and the fixing member (1400) inserted into the fixing hole (1140) of the other rotation extension (1100) may be inserted into the second fixing ring of the other end.

[0168] Accordingly, the array angle, which is the angle formed by two adjacent rotation extensions (1100), can be changed according to the bending angle formed by the two bars of the shape memory alloy portion (1200) to which the two rotation extensions (1100) and one end and the other end are each connected.

[0169] That is, the plurality of rotation extensions (1100) can be unfolded or bent by changing the angle formed by two adjacent rotation extensions (1100) according to the shape deformation of the plurality of shape memory alloy parts (1200).

[0170] Accordingly, the support member (1-2) whose lower part is supported by a plurality of rotational extensions (1100) can also be unfolded or bent in response to the unfolding and bending of the plurality of rotational extensions (1100).

[0171] Meanwhile, the shape of the plurality of shape memory alloy parts (1200) can be changed so that the arrangement angle formed by two adjacent rotation extension parts (1100) changes within a change angle range.

[0172] Specifically, among the plurality of rotation extensions (1100), two adjacent rotation extensions (1100) can be spread out so as to be arranged on the same straight line when the array angle changes to the maximum angle within the range of variation angles, and can be bent when the array angle changes to an angle other than the maximum angle within the range of variation angles.

[0173] Here, the maximum angle among the range of variable angles can be 180 degrees.

[0174] To this end, the deformation unit can individually apply current or heat to each of the plurality of shape memory alloy units (1200) to deform the shape of each of the plurality of shape memory alloy units (1200).

[0175] For example, when an unfolding control signal for unfolding a plurality of rotational extensions (1100) is input, the deformation unit can apply current or heat to at least one of the plurality of shape memory alloy parts (1200) to deform the shape so that two bars of the shape memory alloy part (1200) are unfolded, thereby unfolding the two rotational extensions (1100) connected to the shape memory alloy part (1200).

[0176] Conversely, when a bending control signal for bending a plurality of rotational extensions (1100) is input, the deformation unit can deform the shape so that two bars of the shape memory alloy unit (1200) are bent without applying current or heat to the plurality of shape memory alloy units (1200), thereby causing the two rotational extensions (1100) connected to the shape memory alloy unit (1200) to bend.

[0177] For this purpose, the deformation unit may be provided with an output circuit capable of applying current or heat.

[0178] Meanwhile, when the shape memory alloy part (1200) is deformed (spreads or shrinks), the plurality of rotational extensions (1100) also change their arrangement angles and spread or bend, and as the plurality of rotational extensions (1100) spread or bend, the support member (1-2) whose lower part is supported by the plurality of rotational extensions (1100) can also spread or bend.

[0179] A plurality of elastic members (1500) are connected at one end to a fastening member (1300) and at the other end to a shape memory alloy member (1200), and can be relaxed when the fastening member (1300) and the shape memory alloy member (1200) are separated according to the arrangement angle between the rotational extension members (1100).

[0180] Accordingly, the plurality of elastic members (1500) can apply elastic restoring force to the fastening member (1300) and the shape memory alloy part (1200) as they are spaced apart.

[0181] FIG. 25 is a bottom perspective view of a chair, which is a mechanism in which two seat sequential extension devices according to the fourth embodiment of the present invention are installed.

[0182] As illustrated in Fig. 25, a plurality of seat sequential extension devices (1000) can be installed on a chair. Thus, even if a heavy object is positioned on top of the support member (1-2), the support member (1-2) can be supported and extended by the plurality of seat sequential extension devices (1000).

[0183] FIG. 26 is a perspective view of a sheet sequential extension device according to a fifth embodiment of the present invention, and FIG. 27 is a left side view of a sheet sequential extension device according to a fifth embodiment of the present invention with a plurality of rotational extension parts unfolded.

[0184] Referring to FIGS. 26 and 27, the sheet sequential extension device (1000') according to the fifth embodiment may include the same configuration as the sheet sequential extension device (1000) according to the fourth embodiment, but does not include only the elastic member (1500).

[0185] The sheet sequential extension device (1000') according to the fifth embodiment does not include an elastic member (1500), so that when electricity or heat is applied to the shape memory alloy member (1200), the shape memory alloy member (1200) is deformed into an unfolded shape, and the plurality of rotation extension members (1100) are unfolded, so that even if the shape memory alloy member (1200) and the fastening member (1300) are separated, an elastic restoring force is not applied from the elastic member (1500), so that the shape memory alloy member (1200) is deformed more quickly, so that the unfolding motion of the support member (1-2) can be completed quickly.

[0186] The present invention has been described above, focusing on preferred embodiments. Those skilled in the art will appreciate that variations and modifications can be made to the invention without departing from its essential characteristics. Therefore, the disclosed embodiments should be considered illustrative rather than restrictive. The scope of the present invention is set forth in the claims, not the foregoing description, and all differences within the scope equivalent thereto should be construed as being encompassed by the invention.

[0187] As described above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

Claims

1. A seat sequential extension device installed in a device having a seating member for a user to sit on and a support member for supporting at least a portion of the lower body of the user sitting on the seating member, A plurality of rotational extensions having a body part that supports at least a portion of the lower part of the support member, one end of the body part being rotatably connected to the other end of the body part of another adjacent rotational extension part, and the other end of the body part being rotatably connected to one end of the body part of another adjacent rotational extension part; A plurality of support members each coupled to the plurality of rotation extension members; A support member characterized by including a support member that moves in the first direction toward the plurality of supported members to support at least some of the plurality of supported members so that the rotational extension coupled to the supported supported members is spread out, or moves in the second direction opposite to the first supported member direction so that the supported supported members are not supported so that the rotational extension coupled to the unsupported supported members are bent. Sheet sequential extension device.

2. In paragraph 1, The above multiple supporting parts It has a first protruding protrusion, The above support When moving in the direction of the first support portion or the direction of the second support portion, the first support protrusion is crossed to support the plurality of support portions. Sheet sequential extension device.

3. In paragraph 2, The above multiple supporting parts It further comprises a second supporting protrusion formed protruding from the lower portion of the first supporting protrusion, The above support When moving in the direction of the first support portion or the direction of the second support portion, it is characterized in that it moves between the second support protrusion and the first support protrusion. Sheet sequential extension device.

4. In paragraph 1, The above plurality of rotating extensions It further comprises a first rotation fastening hole formed through one end of the body portion and a second rotation fastening hole formed through the other end of the body portion, The above sheet sequential extension device It is characterized in that it further includes a fastening member which is inserted into the first fastening hole of one of the plurality of rotary extensions and the second fastening hole of another rotary extension adjacent to one of the rotary extensions, and which rotatably fastens one of the rotary extensions and the other rotary extension, and which becomes a rotation axis of one of the rotary extensions and the other rotary extension. Sheet sequential extension device.

5. In paragraph 1, The above plurality of rotating extensions It further comprises a first rotation fastening hole formed through one end of the body portion and a second rotation fastening hole formed through the other end of the body portion, The above multiple supporting parts It further comprises a third rotation fastening hole formed through one end and a fourth rotation fastening hole formed through the other end. The above sheet sequential extension device It is characterized in that it further comprises a fastening member which is inserted into the first rotation fastening hole of one of the plurality of rotational extensions, the third rotation fastening hole of the supported part which is arranged to face one of the plurality of rotational extensions, the second rotation fastening hole of another rotational extension adjacent to one of the plurality of rotational extensions, and the fourth rotation fastening hole of the other supported part which is arranged to face the other rotational extension, and which rotatably fastens one of the rotational extensions, the other rotational extensions, the supported part, and the other supported part, and which becomes a rotation axis of one of the rotational extensions, the other rotational extensions, the supported part, and the other supported part. Sheet sequential extension device.

6. In paragraph 1, The above sheet sequential extension device When a supported portion coupled with one of the plurality of rotational extensions and another supported portion coupled with another rotational extension adjacent to one of the rotational extensions are not supported by the support portion, an arrangement angle formed by one of the rotational extensions and the other rotational extension is rotatably connected to the body of one of the rotational extensions so that the arrangement angle formed by the one of the rotational extensions and the other rotational extension forms a preset reference angle, and the other end is rotatably connected to the body of the other rotational extension. The above-mentioned supported portion and the other supported portion are supported by the support portion, and when the arrangement angle exceeds the preset reference angle, the elastic member is relaxed, and the elastic restoring force generated by the relaxation is applied to the one of the rotational extension portions and the other of the rotational extension portions; characterized in that it further includes; Sheet sequential extension device.

7. In paragraph 1, The above support It is characterized by having a gear formed in a direction parallel to the direction of the first support portion on the inside or outside, a gear wheel that rotates by engaging with the gear, and a motor that rotates the gear wheel. Sheet sequential extension device.

8. In a seat sequential extension device installed in a device having a seating member for a user to sit on and a support member for supporting at least a portion of the lower body of the user sitting on the seating member, A plurality of rotational extensions having a body part that supports at least a portion of the lower part of the support member, one end of the body part being rotatably connected to the other end of the body part of another adjacent rotational extension part, and the other end of the body part being rotatably connected to one end of the body part of another adjacent rotational extension part; and A support member characterized by including a support member that moves in a first extension direction toward the plurality of rotational extensions to support at least some of the plurality of rotational extensions so that the supported rotational extensions are spread out, or moves in a second extension direction opposite to the first extension direction so that the supported rotational extensions are not supported so that the unsupported rotational extensions are bent. Sheet sequential extension device.

9. In paragraph 8, The above plurality of rotating extensions It further comprises a first body protrusion formed protruding between one end of the body part and the other end of the body part, The above support When moving in the direction of the first extension portion or the direction of the second extension portion, the first body protrusion is characterized in that it supports the plurality of rotational extension portions by crossing over them. Sheet sequential extension device.

10. In paragraph 9, The above plurality of rotating extensions It further comprises a second body protrusion formed protruding from the lower portion of the first body protrusion between one end of the body portion and the other end of the body portion, The above support When moving in the direction of the first extension portion or the direction of the second extension portion, it is characterized in that it moves between the second body protrusion portion and the first body protrusion portion. Sheet sequential extension device.

11. In paragraph 8, The above plurality of rotating extensions It further comprises a first rotation fastening hole formed through one end of the body portion and a second rotation fastening hole formed through the other end of the body portion, The above sheet sequential extension device It is characterized in that it further includes a fastening member which is inserted into the first fastening hole of one of the plurality of rotary extensions and the second fastening hole of another rotary extension adjacent to one of the rotary extensions, and which rotatably fastens one of the rotary extensions and the other rotary extension, and which becomes a rotation axis of one of the rotary extensions and the other rotary extension. Sheet sequential extension device.

12. In paragraph 8, The above sheet sequential extension device When one of the plurality of rotational extensions and another rotational extension adjacent to the one rotational extension are not supported by the support, one end is rotatably connected to the body of the one rotational extension and the other end is rotatably connected to the body of the other rotational extension so that the arrangement angle formed by the one rotational extension and the other rotational extension forms a preset reference angle, The above-described one of the rotation extensions and the other of the rotation extensions are supported by the support member, and when the arrangement angle exceeds the preset reference angle, an elastic member is relaxed, and an elastic restoring force generated by the relaxation is applied to the one of the rotation extensions and the other of the rotation extensions; characterized in that it further includes; Sheet sequential extension device.

13. In paragraph 8, The above support It is characterized by having a gear formed in a direction parallel to the direction of the first extension on the inside or outside, a gear wheel that rotates by engaging with the gear, and a motor that rotates the gear wheel. Sheet sequential extension device.

14. In a seat sequential extension device installed in a device having a seating member for a user to sit on and a support member for supporting at least a portion of the lower body of the user sitting on the seating member, A plurality of rotational extensions having a body part that supports at least a portion of the lower part of the support member, one end of the body part being rotatably connected to the other end of the body part of another adjacent rotational extension part, and the other end of the body part being rotatably connected to one end of the body part of another adjacent rotational extension part; A plurality of shape memory alloy parts formed of a shape memory material and connected to two adjacent rotational extensions among a plurality of rotational extensions so that one end and the other end can rotate respectively; and A deformation unit that individually applies current or heat to each of the plurality of shape memory alloy units to deform the shape of each of the plurality of shape memory alloy units; The above plurality of rotating extensions The shape memory alloy portions are characterized in that the angle between the two adjacent rotation extension portions changes according to the shape deformation, thereby unfolding or bending. Sheet sequential extension device.

15. In paragraph 14, The above plurality of rotating extensions It further comprises a first rotation fastening hole formed through one end of the body portion and a second rotation fastening hole formed through the other end of the body portion, The above sheet sequential extension device It is characterized in that it further includes a fastening member which is inserted into the first fastening hole of one of the plurality of rotary extensions and the second fastening hole of another rotary extension adjacent to one of the rotary extensions, and which rotatably fastens one of the rotary extensions and the other rotary extension, and which becomes a rotation axis of one of the rotary extensions and the other rotary extension. Sheet sequential extension device.

16. In paragraph 15, The above plurality of rotating extensions It further has a fixing hole formed through between one end and the other end of the above body part, The above plurality of shape memory alloy parts It has a first fixing ring formed in a ring shape at one end and a second fixing ring formed in a ring shape at the other end, The above sheet sequential extension device It is characterized in that it further includes a plurality of fixing members inserted into the fixing hole of one of the plurality of rotational extensions, a first fixing ring of a shape memory alloy part whose one end is connected to one of the rotational extensions, and a second fixing ring of another shape memory alloy part whose other end is connected to one of the rotational extensions. Sheet sequential extension device.

17. In paragraph 14, The above plurality of shape memory alloy parts The shape is deformed so that the arrangement angle formed by two adjacent rotation extensions varies within a range of variation angles, The two adjacent rotation extensions above are When the above array angle changes to the maximum angle among the above variation angle ranges, it is spread out so as to be arranged on the same straight line, and when the above array angle changes to an angle other than the maximum angle among the above variation angle ranges, it is bent. Sheet sequential extension device.

18. In paragraph 17, The above deformation part When an unfolding control signal for unfolding the plurality of rotational extensions is input, current is applied to the plurality of shape memory alloy parts or heat is applied, and when a bending control signal for bending the plurality of rotational extensions is input, current is not applied to the plurality of shape memory alloy parts or heat is not applied. Sheet sequential extension device.

19. In paragraph 15, The above sheet sequential extension device A plurality of elastic members, one end of which is fastened to the fastening member and the other end of which is fastened to the shape memory alloy portion, and which are relaxed when the fastening member and the shape memory alloy portion are separated according to the arrangement angle between the rotational extensions to apply an elastic restoring force to the fastening member and the shape memory alloy portion; characterized in that the elastic members further include: Sheet sequential extension device.

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