Variable shape structure having bend members

1. A variable shape structure comprising:

a first bend member having a first central coupling point, a first one-end coupling point, and a first other-end coupling point that are arranged so as to form a V shape with a fixed bend angle;

a second bend member having a second central coupling point, a second one-end coupling point, and a second other-end coupling point that are arranged so as to form a V shape with a fixed bend angle, the second central coupling point being pivotally coupled to the first central coupling point of the first bend member;

a third bend member having a third central coupling point, a third one-end coupling point, and a third other-end coupling point that are arranged so as to form a V shape with a fixed bend angle, at least one of the third one-end coupling point and the third other-end coupling point being coupled to one of the first one-end coupling point and the first other-end coupling point of the first bend member, and

a fourth bend member having a fourth central coupling point, a fourth one-end coupling point, and a fourth other-end coupling point that are arranged so as to form a V shape with a fixed bend angle, the fourth bend member being adjacent to the first bend member in a Y direction, at least one of the fourth one-end coupling point and the fourth other-end coupling point being coupled to one of the first one-end coupling point and the first other-end coupling point of the first bend member, wherein

the second bend member is adjacent to the first bend member in the Y direction, and wherein the structure forms a panel by coupling together the first, second, third and fourth bend members that are adjacent in an X direction and the Y direction, and wherein

the third bend member is adjacent to the first bend member in the X direction.

2. The variable shape structure of claim 1 , wherein

the first, second, third and fourth bend members contiguously coupled in the X direction or the Y direction each have a same shape and a same size, with a length between the central coupling point and the one-end coupling point being equal to a length between the central coupling point and the other-end coupling point.

3. The variable shape structure of claim 1 , wherein

the first, second, third and fourth bend members contiguously coupled in the X direction and the first, second, third and fourth bend members contiguously coupled in the Y direction each have the same shape and the same size, with a length between the central coupling point and the one-end coupling point being equal to a length between the central coupling point and the other-end coupling point.

4. The variable shape structure of claim 1 , wherein

the third one-end coupling point of the third bend member is pivotally coupled to the first one-end coupling point of the first bend member, and wherein

the fourth one-end coupling point of the fourth bend member is pivotally coupled to the first one-end coupling point of the first bend member.

5. The variable shape structure of claim 1 , further comprising:

a cross unit in which two linear members crossed in an X shape are pivotally coupled together at an intersection, wherein

the cross unit has four end coupling points,

each of the four end coupling points being pivotally coupled to the one-end coupling point of one of the first, second, third and fourth bend members.

6. The variable shape structure of claim 1 , comprising:

a plurality of cross units each including a first arm and a second arm that are crossed in an X shape, at an intersection of which both the arms are pivotally coupled, the cross units adjacent to each other being pivotally coupled together at the cross units ends, wherein

each of the first arm and the second arm comprises the first bend member, the second bend member, the third bend member, and the fourth bend member, wherein

the third bend member is pivotally coupled at the third one-end coupling point to the first one-end coupling point of the first bend member, and wherein

the fourth central coupling point is pivotally coupled to the third central coupling point of the third bend member.

7. The variable shape structure of claim 1 , wherein

the first, second and third bend members adjacent to each other are coupled together to form a frame.

8. The variable shape structure of claim 7 , wherein

the first bend member, the second bend member, and the third member have the same shape and the same size, and wherein

a length between the central coupling point and the one-end coupling point is equal to a length between the central coupling point and the other-end coupling point.

9. The variable shape structure of claim 8 , wherein

the fourth central coupling point is pivotally coupled to the third central coupling point of the third bend member, wherein

the third one-end coupling point of the third bend member is pivotally coupled to the first one-end coupling point of the first bend member, wherein

the fourth one-end coupling point of the fourth bend member is pivotally coupled to the second one-end coupling point of the second bend member, and wherein

the fourth bend member has the same shape and the same size as those of the first bend member, the second bend member, and the third bend member.

10. The variable shape structure of claim 7 , wherein

the fourth central coupling point is pivotally coupled to the third central coupling point of the third bend member, wherein

the third one-end coupling point of the third bend member is pivotally coupled to the first one-end coupling point of the first bend member, and wherein

the fourth one-end coupling point of the fourth bend member is pivotally coupled to the second one-end coupling point of the second bend member.

11. The variable shape structure of claim 7 , wherein

the third one-end coupling point of the third bend member is coupled to the first one-end coupling point of the first bend member, and wherein

the third other-end coupling point of the third bend member is coupled to the first other-end coupling point of the first bend member.

12. The variable shape structure of claim 7 , wherein

the variable shape structure is a frame having a plurality of corners,

the structure further comprising:

a first bent member with a bent shape pivotally coupled, at each of the corners, to the one-end coupling point of the one of the bend members adjacent to the one-end of the first bent member and to the other-end coupling point of the one of the bend members adjacent on the other-end of the first bent member;

a second bent member with a bent shape pivotally coupled, at each of the corners, to the one-end coupling point of the one of the bend members adjacent to the one-end of the second bent member, to which the first bent member is not coupled, and to the other-end coupling point of the one of the bend members adjacent on the other-end of the second bent member, to which the first bent member is not coupled; and

a corner coupling shaft via which the first bent member and the second bent member are pivotally coupled together at their intersection.

13. A variable shape structure comprising:

a first bend member having a first central coupling point, a first one-end coupling point, and a first other-end coupling point that are arranged so as to form a V shape with a fixed bend angle;

a second bend member having a second central coupling point, a second one-end coupling point, and a second other-end coupling point that are arranged so as to form a V shape with a fixed bend angle, the second central coupling point being pivotally coupled to the first central coupling point of the first bend member;

a third bend member having a third central coupling point, a third one-end coupling point, and a third other-end coupling point that are arranged so as to form a V shape with a fixed bend angle, at least one of the third one-end coupling point and the third other-end coupling point being coupled to one of the first one-end coupling point and the first other-end coupling point of the first bend member, wherein

the structure forms a panel by coupling together a plurality of extendable arms that are adjacent in an X direction and a Y direction, wherein

the second bend member is adjacent to the first bend member in the Y direction, wherein

the third bend member is adjacent to the first bend member in the X direction, the third one-end coupling point being pivotally coupled to the first one-end coupling point of the first bend member,

the structure further comprising:

a fourth bend member having a fourth central coupling point, a fourth one-end coupling point, and a fourth other-end coupling point that are arranged so as to form a V shape with a fixed bend angle, the fourth bend member being adjacent to the second bend member in the X direction, the fourth one-end coupling point being pivotally coupled to the second one-end coupling point of the second bend member, the fourth central coupling point being pivotally coupled to the third central coupling point of the third bend member, wherein

the first, second, third and fourth bend members each comprise linearly contiguous cross units to make up an extendable arm of the plurality of extendable arms, and wherein

each of the cross units comprises a first linear member, a second linear member crossing the first linear member, and a pivot shaft via which the first linear member and the second linear member are pivotally coupled together at an intersection.

14. The variable shape structure of claim 13 , wherein

each of the first, second, third and fourth bend members forms a semicircular arm in its expanded state.