Frame assembly and motion assistance apparatus including the same
A frame assembly includes a first longitudinal member, a second longitudinal member spaced apart from the first longitudinal member, and a plurality of distance maintaining members connected between the first longitudinal member and the second longitudinal member, and configured to maintain a distance between the first longitudinal member and the second longitudinal member.
1. A frame assembly comprising:
a first longitudinal member;
A second longitudinal member spaced apart from the first longitudinal member; and
a plurality of distance maintaining members each having a first end and a second end, the first end connected to the first longitudinal member and the second end connected to the second longitudinal member, the plurality of distance maintaining members configured to maintain a distance between the first longitudinal member and the second longitudinal member, wherein
the first end of at least one of the plurality of distance maintaining members is fixed to the first longitudinal member and the second end of the at least one of the plurality of distance maintaining members is slid ably connected to the second longitudinal member,
the second longitudinal member is configured to bend the frame assembly in a first direction, when a tensile force is applied to the second longitudinal member,
the second longitudinal member is configured to bend the frame assembly in a second direction opposite to the first direction, when a compressive force is applied to the second longitudinal member,
the first end of the at least one of the plurality of distance maintaining members has a first height in a length direction of the first longitudinal member,
the second end of the at least one of the plurality of distance maintaining members has a second height in a length direction of the second longitudinal member, and
the first height is greater than the second height.
2. The frame assembly of claim 1 , wherein the first longitudinal member and the second longitudinal member each have ends with an intermediate portion therebetween, and
the plurality of distance maintaining members connect the first longitudinal member and the second longitudinal member such that the intermediate portion of the second longitudinal member moves relative to the intermediate portion of the first longitudinal member.
3. The frame assembly of claim 1 , wherein the second longitudinal member is parallel with the first longitudinal member.
4. The frame assembly of claim 1 , wherein
the frame assembly has ends with an intermediate portion therebetween, and
the intermediate portion of the frame assembly is configured to flex in response to a force applied in a lateral direction thereto.
5. The frame assembly of claim 1 , wherein the first longitudinal member and the second longitudinal member each include a flexible material.
6. The frame assembly of claim 1 , wherein a length of each of the plurality of distance maintaining members is less than a length of each of the first longitudinal member and the second longitudinal member.
7. The frame assembly of claim 1 , wherein adjacent ones of the plurality of distance maintaining members are separated by a distance, the distance being less than a length of each of the plurality of distance maintaining members.
8. The frame assembly of claim 1 , wherein at least one of the plurality of distance maintaining members has an intermediate portion between the first end and the second end.
9. The frame assembly of claim 8 , wherein at least one of the first end and the second end of the at least one of the plurality of distance maintaining members is rotatably fixed to one of the first longitudinal member and the second longitudinal member.
10. The frame assembly of claim 1 , wherein at least one of the plurality of distance maintaining members is slidably connected to one of the first longitudinal member and the second longitudinal member.
11. The frame assembly of claim 10 , wherein the second longitudinal member has an intermediate portion between the first end and the second end, and the frame assembly further comprises:
a first object and a second object, wherein
the second end of the second longitudinal member is connected to the second object such that the second end of the second longitudinal member moves in a direction that intersects a longitudinal direction of the second object.
12. The frame assembly of claim 11 , wherein the first object is configured to support a first portion of a user, and the second object is configured to support a second portion of the user, the first portion and the second portion of the user being on opposite sides of a joint of the user.
13. The frame assembly of claim 12 , wherein, the frame assembly is configured to apply a torque to the second object to rotate the second object relative to the first object, if the tensile force is applied to the second longitudinal member.
14. The frame assembly of claim 11 , wherein the first longitudinal member is an elastic body.
15. The frame assembly of claim 1 , wherein the first longitudinal member and the second longitudinal member each have an intermediate portion between the first end and the second end, and the frame assembly further comprises:
a first object and a second object, the first object connected to the first end of the first longitudinal member and the first end of the second longitudinal member, and the second object connected to the second end of the first longitudinal member and the second end of the second longitudinal member.
16. A motion assistance apparatus comprising:
a first object configured to attach to a first portion of a user;
a second object configured to attach to a second portion of the user; and
a frame assembly including,
a first longitudinal member configured to connect the first object and the second object,
a second longitudinal member spaced apart from the first longitudinal member, and
a plurality of distance maintaining members each having a first end and a second end, the first end connected to the first longitudinal member and the second end connected to the second longitudinal member, wherein
the first end of at least one of the plurality of distance maintaining members is fixed to the first longitudinal member and the second end of the at least one of the plurality of distance maintaining members is slidably connected to the second longitudinal member,
the second longitudinal member is configured to bend the frame assembly in a first direction, when a tensile force is applied to the second longitudinal member,
the second longitudinal member is configured to bend the frame assembly in a second direction opposite to the first direction, when a compressive force is applied to the second longitudinal member,
the first end of the at least one of the plurality of distance maintaining members has a first height in a length direction of the first longitudinal member,
the second end of the at least one of the plurality of distance maintaining members has a second height in a length direction of the second longitudinal member, and
the first height is greater than the second height.
17. The motion assistance apparatus of claim 16 , further comprising:
a rotary body connected to one of the first longitudinal member and the second longitudinal member,
wherein the frame assembly is configured to perform one of a flexion motion and an extension motion based on a direction of rotation of the rotary body.
18. The motion assistance apparatus of claim 16 , wherein one of the first longitudinal member and the second longitudinal member is an elastic body, and
an initial state of the frame assembly is a flexion state.