KR102677478B1 - Seat sequential extension device - Google Patents

Abstract

The seat sequential extension device according to the present invention is installed in a device provided with a seating member so that a user can sit, and provided with a support member for supporting at least a portion of the lower body of the user sitting on the seating member, wherein the lower part of the support member and a body portion supporting at least a portion of the body portion, one end of the body portion being rotatably coupled with the other end of the body portion of another adjacent rotational extension, and the other end of the body portion being rotatable with one end of the body portion of another adjacent rotational extension. a plurality of rotating extension parts coupled to each other; A plurality of shape memory alloy parts formed of a shape memory material, one end and the other end of which are respectively rotatably fastened to two neighboring rotation extension parts among the plurality of rotation extension parts; And a deformation part that changes the shape of each of the plurality of shape memory alloy parts by individually applying current or heat to each of the plurality of shape memory alloy parts, wherein the plurality of rotation extension parts are configured to change the shape of each of the plurality of shape memory alloy parts. Depending on the shape deformation of the memory alloy part, the angle formed by the two neighboring rotation extension parts may change and unfold or bend.

Description

Seat sequential extension device

The present invention relates to a seat sequential extension device, and more specifically, a plurality of rotatable extensions rotatably fastened to each other support the lower part of a support member supporting at least a portion of the lower body of a user sitting on a seating member, and these plurality of rotatable extensions A plurality of shape memory alloy parts formed of a shape memory material are fastened to the rotation extension part, and the shape of the plurality of shape memory alloy parts is modified to unfold or bend the plurality of rotation extension parts, so that the plurality of shape memory alloy parts are supported by the unfolding or bending rotation extension part. It relates to a sheet sequential extension device that extends or bends a support member.

In general, a device equipped with a seating member for a user to sit on is called a chair, and these chair-shaped devices, in various variations, are implemented as sofas used in living rooms, etc., and car seats placed in cars.

Recently, in order to provide more comfort, a backrest that supports the user's back or a support member that supports the user's lower body has been added, and chairs (sofas, car seats) with a reclining function that adjusts the angle of the backrest or support member have been added. ) is being developed.

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

As an example, looking at the configuration of a conventional fully automatic recliner sofa, a fully automatic recliner has a leg frame formed at regular intervals, an arm rest frame installed on the upper end of the leg frame, and a slide ball each installed on one side of the leg frame. It is composed of a body frame for the liner and a square-shaped floor support frame that is installed and fixed to the leg frame of the body frame for the fully automatic recliner and supports the body frame 128 for the fully automatic recliner, and a combination of these components. Through this, the angle of the sofa's backrest and calf rest can be easily adjusted according to the user's body type or body condition, thereby realizing the advantage of providing comfort to the user.

However, in the case of this prior art, severe noise is generated when the frame supporting the calf rest is slid through the operation of the control unit, and this noise is caused by friction, which has the problem of reducing the durability of the sofa itself.

Korean Patent No. 10-1238414

The object of the present invention is to support the lower part of the support member that supports at least a portion of the lower body of the user sitting on the seating member by a plurality of rotational extensions rotatably fastened to each other, and to have a plurality of rotational extensions formed of a shape memory material. A plurality of shape memory alloy parts are fastened, and the shape of the plurality of shape memory alloy parts is modified to unfold or bend the plurality of rotational extensions, so that the support member supported by the unfolding or bending rotational extension parts can be extended or bent. The purpose is to provide a sheet sequential extension device.

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention that are not mentioned can be understood by the following description and will be more clearly understood by the examples of the present invention. Additionally, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof indicated in the patent claims.

The seat sequential extension device according to the present invention is installed in a device provided with a seating member so that a user can sit, and provided with a support member for supporting at least a portion of the lower body of the user sitting on the seating member, wherein the lower part of the support member and a body portion supporting at least a portion of the body portion, one end of the body portion being rotatably coupled with the other end of the body portion of another adjacent rotational extension, and the other end of the body portion being rotatable with one end of the body portion of another adjacent rotational extension. a plurality of rotating extension parts coupled to each other; A plurality of shape memory alloy parts formed of a shape memory material, one end and the other end of which are respectively rotatably fastened to two neighboring rotation extension parts among the plurality of rotation extension parts; And a deformation part that changes the shape of each of the plurality of shape memory alloy parts by individually applying current or heat to each of the plurality of shape memory alloy parts, wherein the plurality of rotation extension parts are configured to change the shape of each of the plurality of shape memory alloy parts. Depending on the shape deformation of the memory alloy part, the angle formed by the two neighboring rotation extension parts may change and unfold or bend.

Preferably, the plurality of rotation extensions further include a first rotation fastening hole formed through one end of the body portion and a second rotation fastening hole formed through a second end of the body portion, and the sheet sequential extension device is configured to extend the plurality of rotations. It is inserted into the first rotation fastening hole of any one of the rotation extension parts and the second rotation fastening hole of the other rotation extension adjacent to the one rotation extension part to connect the one rotation extension part to the other rotation extension part. It may further include a fastening member that rotatably fastens one rotation extension and serves as a rotation axis of the one rotation extension and the other rotation extension.

Preferably, the plurality of rotational extensions further include a fixing hole formed through a hole formed between one end and the other end of the body, and the plurality of shape memory alloy parts have a first fixing ring formed in a ring shape at one end and a ring shape at the other end. It is provided with a second fixing ring, and the sheet sequential extension device includes the fixing hole of any one of the plurality of rotary extension parts, and the first fixation of the shape memory alloy part whose one end is fastened to the one rotary extension part. It may further include a plurality of fixing members whose rings and other ends are inserted into the second fixing ring of another shape memory alloy part fastened to one of the rotation extension parts.

Preferably, the shape of the plurality of shape memory alloy parts is modified so that the arrangement angle formed by the two neighboring rotation extensions varies within the variation angle range, and the arrangement angle of the two neighboring rotation extensions is the maximum angle in the variation angle range. When changed, it is unfolded to be arranged on the same straight line, and when the arrangement angle is changed to an angle other than the maximum angle in the variable angle range, it may be bent.

Preferably, when an unfolding control signal for unfolding the plurality of rotational extensions is input, the deformation unit applies a current or heat to the plurality of shape memory alloy parts and a bending control signal for bending the plurality of rotational extensions. When is input, current may not be applied or heat may not be applied to the plurality of shape memory alloy parts.

Preferably, the sheet sequential extension device has one end fastened to the fastening member and the other end fastened to the shape memory alloy part, and relaxes when the fastening member and the shape memory alloy part are spaced apart according to an arrangement angle between the rotation extension parts. It may further include a plurality of elastic members that apply an elastic restoring force to the fastening member and the shape memory alloy portion.

According to the present invention, the lower part of the support member supporting at least a portion of the lower body of the user sitting on the seating member is supported by a plurality of rotational extensions rotatably fastened to each other, and the plurality of rotational extensions are formed of a shape memory material. The shape memory alloy portion is fastened, and the shape of the plurality of shape memory alloy portions is modified to unfold or bend the plurality of rotational extensions, so that the support member supported by the unfolding or bending rotational extension portion can be extended or bent. .

1 is a perspective view of a sheet sequential extension device according to an embodiment of the present invention.
Figure 2 is a left side view of a sheet sequential extension device according to an embodiment of the present invention.
Figure 3 is a right side view of the sheet sequential extension device according to an embodiment of the present invention.
Figure 4 is an exploded left perspective view of the sheet sequential extension device according to an embodiment of the present invention.
Figure 5 is an exploded right perspective view of the sheet sequential extension device according to an embodiment of the present invention.
Figure 6 is a left side view of a plurality of rotation extension parts of the sheet sequential extension device according to an embodiment of the present invention in an unfolded state.
Figure 7 is a perspective view of a chair, which is a device equipped with a seat sequential extension device according to an embodiment of the present invention.
Figure 8 is a lower perspective view of a chair equipped with a seat sequential extension device according to an embodiment of the present invention.
Figure 9 is a lower perspective view of the chair in a state in which the support member is unfolded by the seat sequential extension device according to an embodiment of the present invention.
Figure 10 is a lower perspective view of a chair equipped with two seat sequential extension devices according to an embodiment of the present invention.
Figure 11 is a perspective view of a sheet sequential extension device according to another embodiment of the present invention.
Figure 12 is a left side view of a plurality of rotation extension parts of the sheet sequential extension device according to another embodiment of the present invention in an unfolded state.

Hereinafter, various embodiments of the present invention are described with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include various modifications, equivalents, and/or alternatives to the embodiments of the present invention. In connection with the description of the drawings, similar reference signs may be used for similar components.

In this document, expressions such as “have,” “may have,” “includes,” or “may include” refer to the presence of the corresponding feature (e.g., numerical value, function, operation, or component such as a part). , and does not rule out the existence of additional features.

In this document, expressions such as “A or B,” “at least one of A or/and B,” or “one or more of A or/and B” may 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” (1) includes at least one A, (2) includes at least one B, or (3) It can refer to all cases including both at least one A and at least one B.

As used herein, expressions such as "first", "second", "first", or "second" may modify various elements in any order and/or importance, and may refer to one element. It is only used to distinguish from other components and does not limit the components. For example, a first orderer device and a second orderer device may represent different orderer devices, regardless of order or importance. For example, a first component may be renamed a second component without departing from the scope of rights described in this document, and similarly, the second component may also be renamed the first component.

A component (e.g., a first component) is “(operatively or communicatively) coupled with/to” another component (e.g., a second component). When “connected to” is mentioned, it should be understood that any component may be directly connected to the other component or may be connected through another component (e.g., a third component). On the other hand, when a component (e.g., a first component) is referred to as being “directly connected” or “directly connected” to another component (e.g., a second component), it is said that the component and the other component are It may be understood that no other components (e.g., third components) exist between components.

The expression “configured to” used in this document may be used depending on the context, for example, “suitable for,” “having the capacity to.” )", "designed to", "adapted to", "made to", or "capable of". . The term “configured (or set) to” may not necessarily mean “specifically designed to” in hardware. Instead, in some contexts, the expression “a device configured to” may mean that the device is “capable of” working with other devices or components. For example, the phrase "processor configured (or set) to perform A, B, and C" refers to a processor dedicated to performing the operations (e.g., an embedded processor), or by executing one or more software programs stored in memory. , may refer to a general-purpose processor (e.g., CPU or application processor) capable of performing the corresponding operations.

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). .

In this specification, “˜device” refers to all types of hardware devices including at least one processor, and depending on the embodiment, it may be understood to also include software configurations operating on the hardware device.

Terms used in this document are merely used to describe specific embodiments and may not be intended to limit the scope of other embodiments. Singular expressions 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 technical field described in this document. Among the terms used in this document, terms defined in general dictionaries may be interpreted to have the same or similar meaning as the meaning they have in the context of related technology, and unless clearly defined in this document, they may be interpreted in an ideal or excessively formal sense. It is not interpreted. In some cases, even terms defined in this document cannot be interpreted to exclude embodiments of this document.

1 is a perspective view of a sheet sequential extension device according to an embodiment of the present invention,

Figure 2 is a left side view of a sheet sequential extension device according to an embodiment of the present invention, Figure 3 is a right side view of a sheet sequential extension device according to an embodiment of the present invention, and Figure 4 is an embodiment of the present invention. Figure 5 is a left separated perspective view of the sheet sequential extension device according to an embodiment of the present invention, Figure 5 is a right separated perspective view of the sheet sequential extension device according to an embodiment of the present invention, and Figure 6 is a plurality of sheet sequential extension device according to an embodiment of the present invention. It is a left side view with the rotating extension part in an unfolded state, Figure 7 is a perspective view of a chair equipped with a seat sequential extension device according to an embodiment of the present invention, and Figure 8 is a seat sequential extension device according to an embodiment of the present invention. It is a lower perspective view of a chair, which is an installed mechanism, and Figure 9 is a lower perspective view of the chair in a state in which the support member is unfolded by the seat sequential extension device according to an embodiment of the present invention, and Figure 10 is a seat according to an embodiment of the present invention. This is a lower perspective view of a chair equipped with two sequential extension devices.

Referring to Figures 1 to 9, the seat sequential extension device 100 according to an embodiment of the present invention is provided with a seating member 11 so that the user can sit, and the lower body of the user sitting on the seating member 11 It can be installed on the device 10 provided with a support member 12 that supports at least part of it.

This device (10, 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.

Specifically, the support member 12 may support at least part of the body below the knees of the user sitting on the seating member 11. For example, the support member 12 may be a calf rest.

For this purpose, one end of the seating member 11 is in contact with the backrest of the chair 10, and one end of the support member 12 is in contact with the other end of the seating member 11 or may extend from the other end of the seating member 11. .

The support member 12 may be made of a flexible material so that it can be bent or unfolded depending on whether the lower part is supported.

At this time, the seat sequential extension device 100 according to an embodiment of the present invention is installed on the chair 10 to bend the support member 12 as shown in Figures 7 and 8 or as shown in Figure 9. As shown, it can be unfolded.

To this end, the sheet sequential extension device 100 according to an embodiment includes a plurality of rotation extension parts 110, a plurality of shape memory alloy parts 120, a deformation part (not shown), a fastening member 130, and a fixing member. It may include 140 and an elastic member 150.

The plurality of rotational extension parts 110 may include a body part 111 that supports at least a portion of the lower part of the support member 12.

The shape of the body portion 111 is not limited, but is shaped like a flat plate, and is disposed perpendicular to the support member 12 so that its edges are in contact with the lower part of the support member 12. can support.

Meanwhile, the body portion 111 may be rotatably fastened to the adjacent body portion 111.

Specifically, one end of the body portion 111 of one rotation extension portion 110, 110b among the plurality of rotation extension portions 110 is adjacent to the body portion 111 of the other rotation extension portion 110, 110a. and the other end of the body portion 111 may be rotatably fastened to one end of the body portion 111 of another neighboring rotary extension portion 110 or 110c.

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.

At this time, the fastening member 130 is connected to the first rotation fastening hole 112 of the body portion 111 of any one of the rotation extensions 110 and 110b among the plurality of rotation extensions 110 and any one of the rotation extensions. (110, 110b) is sequentially inserted into the second rotation fastening hole 113 of the body portion 111 of the other rotation extension portion 110a adjacent to one of the rotation extension portions 110, 110b and the other one. The rotation extension portions 110 and 110a may be rotatably fastened.

Additionally, the fastening member 130 may become a rotation axis when one of the rotation extensions 110b and the other rotation extension 110a rotate.

That is, the plurality of rotational extensions 110 are fastened one by one in succession, and a fastening member 130 is inserted into each of the two neighboring rotational extensions 110, and the two neighboring rotational extensions 110 are fastening members ( It can be rotated using 130) as the rotation axis.

Accordingly, the plurality of rotational extension parts 110 may be connected to each other in a structure that bends or unfolds like a joint when an external force is applied.

Meanwhile, the above-described fastening member 130 may be formed in a bolt shape.

Meanwhile, the body portion 111 of the plurality of rotational extension portions 110 may have a fixing hole 114 formed between one end and the other end through which the two shape memory alloy portions 120 are fastened to be rotatable.

A fixing member 140 may be inserted into the fixing hole 114, and two shape memory alloy parts 120 adjacent to the fixing member 140 inserted into the fixing hole 114 may be fixed.

This shape memory alloy portion 120 is formed of a shape memory material, and one end and the other end of the plurality of rotation extension portions 110 may be respectively rotatably fastened to two neighboring rotation extension portions 110a and 100b. .

Specifically, the shape memory alloy portion 120 is composed of two long bars joined to form a predetermined bending angle, and a first fixing ring formed in a ring shape is provided at one end of one of the two bars. A second fixing ring formed in a ring shape may be provided at the other end of the other bar.

At this time, one of the shape memory alloy parts 120 is a fixing member 140 inserted into the fixing hole 114 of one of the two neighboring rotary extension parts 110. The fixing member 140 inserted into one fixing ring and the fixing hole 114 of the other rotary extension part 110 may be inserted into the second fixing ring at the other end.

Accordingly, the arrangement angle, which is the angle formed by the two neighboring rotation extensions 110, changes depending on the bending angle formed by the two rotation extensions 110 and the two bars of the shape memory alloy portion 120, one end and the other end of which are respectively fastened to each other. It can be.

That is, the plurality of rotational extensions 110 may be unfolded or bent by changing the angle between the two neighboring rotational extensions 110 according to the shape deformation of the plurality of shape memory alloy parts 120.

Accordingly, the support member 12, the lower part of which is supported by the plurality of rotational extensions 110, may also be unfolded or bent in response to the unfolding and bending of the plurality of rotational extensions 110.

Meanwhile, the shape of the plurality of shape memory alloy parts 120 may be modified so that the arrangement angle formed by the two neighboring rotation extension parts 110 changes within the variation angle range.

Specifically, among the plurality of rotational extensions 110, two neighboring rotational extensions 110 are unfolded to be arranged on the same straight line when the array angle changes to the maximum angle in the variable angle range, and the array angle changes to the maximum angle in the variable angle range. If the angle is changed to something other than the angle, it may bend.

Here, the maximum angle in the variable angle range may be 180 degrees.

To this end, the deformation unit may deform the shape of each of the plurality of shape memory alloy parts 120 by individually applying current or heat to each of the plurality of shape memory alloy parts 120.

For example, when an unfolding control signal for unfolding the plurality of rotation extension parts 110 is input, the deformation unit applies current or heat to one or more of the plurality of shape memory alloy parts 120 to form the shape memory alloy part. By deforming the shape of the two bars of 120 to spread, the two rotational extension parts 110 fastened to the corresponding shape memory alloy part 120 can be unfolded.

On the contrary, when a bending control signal to bend the plurality of rotation extension parts 110 is input, the deformation part does not apply current or heat to the plurality of shape memory alloy parts 120, thereby forming the shape memory alloy parts 120. By modifying the shape of the two bars to shrink, the two rotation extension parts 110 coupled to the corresponding shape memory alloy part 120 can be bent.

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

Meanwhile, when the shape memory alloy portion 120 is deformed (opened or contracted), the plurality of rotational extensions 110 also change their arrangement angles to unfold or bend, and the plurality of rotational extensions 110 are unfolded or bent. Accordingly, the support member 12, the lower part of which is supported by the plurality of rotating extension parts 110, may also be unfolded or bent.

The plurality of elastic members 150 have one end fastened to the fastening member 130 and the other end fastened to the shape memory alloy part 120, and have a shape with the fastening member 130 according to the arrangement angle between the rotation extension parts 110. When the memory alloy portion 120 is spaced apart, it may relax.

Accordingly, as the plurality of elastic members 150 are spaced apart, an elastic restoring force may be applied to the fastening member 130 and the shape memory alloy portion 120.

Figure 10 is a lower perspective view of a chair equipped with two seat sequential extension devices according to an embodiment of the present invention.

As shown in FIG. 10, a plurality of seat sequential extension devices 100 may be installed on a chair. Through this, even if a heavy object is located on the upper part of the support member 12, the support member 12 can be supported and unfolded through the plurality of sheet sequential extension devices 100.

Figure 11 is a perspective view of a sheet sequential extension device according to another embodiment of the present invention, and Figure 12 is a left side view of a plurality of rotation extension parts of the sheet sequential extension device according to another embodiment of the present invention in an unfolded state.

11 and 12, the sheet sequential extension device 100' according to another embodiment does not include only the elastic member 150 compared to the sheet sequential extension device 100 according to one embodiment, and other components include The same may be included.

The sheet sequential extension device 100' according to another embodiment does not include the elastic member 150, so that when electricity or heat is applied to the shape memory alloy portion 120, the shape memory alloy portion 120 has an expanded shape. is deformed, and the plurality of rotational extensions 110 are spread out, so that even if the shape memory alloy part 120 and the fastening member 130 are separated, an elastic restoring force is not applied from the elastic member 150, thereby forming a shape memory more quickly. The alloy portion 120 is deformed so that the unfolding operation of the support member 12 can be completed quickly.

So far, the present invention has been examined with a focus on preferred embodiments. A person skilled in the art to which the present invention pertains will understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the equivalent scope should be construed as being included in the present invention.

As described above, although the present invention has been described with limited examples and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following will be understood by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalence of the patent claims to be described.

100: Sheet sequential extension device
110: rotation extension
120: Shape memory alloy part
130: fastening member
140: fixing member
150: elastic member

Claims (6)

In the seat sequential extension device installed on a device provided with 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,
It has a body portion supporting at least a portion of the lower part of the support member, one end of the body portion is rotatably fastened to the other end of the body portion of another adjacent rotational extension, and the other end of the body portion is a body of another adjacent rotational extension. A plurality of rotating extension parts rotatably coupled to one end of the unit;
A plurality of shape memory alloy parts formed of a shape memory material, one end and the other end of which are respectively rotatably fastened to two neighboring rotation extension parts among the plurality of rotation extension parts; and
It includes a deformation unit that changes the shape of each of the plurality of shape memory alloy parts by individually applying current or heat to each of the plurality of shape memory alloy parts,
The plurality of rotation extensions
Characterized in that the angle formed by the two neighboring rotation extension parts is changed and unfolded or bent according to the shape deformation of the plurality of shape memory alloy parts.
Sheet sequential extension device.
According to paragraph 1,
The plurality of rotation extensions
Further comprising a first rotation fastening hole formed through one end of the body portion and a second rotation fastening hole formed through a second end of the body portion,
The sheet sequential extension device is
It is inserted into the first rotation fastening hole of any 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 rotate the one of the rotational extensions. Characterized in that it further comprises a; a fastening member that rotatably fastens the extension and the other rotational extension and serves as a rotation axis of the one of the rotational extensions and the other rotational extension.
Sheet sequential extension device.
According to paragraph 2,
The plurality of rotation extensions
Further comprising a fixing hole formed through the body between one end and the other end,
The 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 sheet sequential extension device is
The fixing hole of any one of the plurality of rotational extensions, the first fixing ring of the shape memory alloy part whose one end is engaged with the one of the rotational extensions, and the other end of which is engaged with the one of the rotational extensions Characterized in that it further comprises a plurality of fixing members inserted into the second fixing ring of the other shape memory alloy part.
Sheet sequential extension device.
According to paragraph 1,
The plurality of shape memory alloy parts
The shape is transformed so that the arrangement angle formed by the two neighboring rotation extensions varies within the variable angle range,
The two neighboring rotation extensions are
When the array angle changes to the maximum angle in the variable angle range, it unfolds to be arranged on the same straight line, and when the array angle changes to an angle other than the maximum angle in the variable angle range, it is bent.
Sheet sequential extension device.
According to paragraph 4,
The deformed part is
When an unfolding control signal to unfold the plurality of rotational extensions is input, current is applied or heat is applied to the plurality of shape memory alloy parts, and when a bending control signal to bend the plurality of rotational extensions is input, the plurality of rotational extensions are Characterized by not applying current or heat to the shape memory alloy part of
Sheet sequential extension device.
According to paragraph 2,
The sheet sequential extension device is
One end is fastened to the fastening member, and the other end is fastened to the shape memory alloy part, and when the fastening member and the shape memory alloy part are spaced apart according to the arrangement angle between the rotating extension parts, they are relaxed to exert an elastic restoring force between the fastening member and the shape memory alloy part. Characterized in that it further comprises a plurality of elastic members applied to the shape memory alloy portion.
Sheet sequential extension device.

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