Detachable crutches and method of controlling the same

1. A pair of detachable crutches extending in a longitudinal direction thereof, each of the detachable crutches comprising:

a metal ball having magnetic properties;

a holder having magnetic properties,

wherein a magnetic force is generated between the metal ball provided at one of the crutches and the holder provided at a remaining one of the crutches so as to maintain attachment therebetween; and

a sensor configured to sense whether the metal ball and the holder have been attached to each other.

2. The detachable crutches according to claim 1 , wherein each of the crutches further comprises an arm support, extending from an upper end portion of each crutch, and a handgrip disposed under the arm support and extending outwards in the longitudinal direction.

3. The detachable crutches according to claim 2 , wherein the arm support extends from the upper end portion of each crutch in both lateral directions so as to surround a portion of a wearer's forearm.

4. The detachable crutches according to claim 2 , wherein the handgrip and the arm support are integrally formed with each other and are rotatably coupled to each of the crutches.

5. The detachable crutches according to claim 2 , wherein the holder is disposed on an outer surface of the arm support that is located at a side of a wearer's forearm, and

wherein the metal ball is coupled to the upper end portion of each of the crutches.

6. The detachable crutches according to claim 5 , wherein the metal ball is coupled to the arm support via a strap so that a relative position between the metal ball and the crutches is variable.

7. The detachable crutches according to claim 1 , wherein each of the crutches further comprises a handgrip, extending outwards in the longitudinal direction, and a manipulation unit provided at the handgrip,

wherein the manipulation unit comprises buttons for controlling operation of at least one of a wearable robot or the crutches worn on a wearer, and

wherein, when the sensor senses that the metal ball and the holder have been attached to each other, the buttons of the manipulation unit are deactivated.

8. The detachable crutches according to claim 1 , wherein the metal ball and the holder are permanent magnets configured to generate a magnetic force to attract each other, and

wherein the sensor is an electromagnetic wave sensor configured to sense an electromagnetic wave that varies depending on attachment or detachment of the metal ball and the holder from each other.

9. The detachable crutches according to claim 1 , wherein the metal ball comprises protruding portions coupled to an outer surface thereof via elastic members,

wherein the holder comprises receiving recesses into which the protruding portions are inserted when the metal ball is attached to the holder, and

wherein the sensor senses current flowing through electric wires connected to two opposite sides of the holder when the protruding portions are inserted into the receiving recesses, thereby sensing attachment or detachment of the metal ball and the holder from each other.

10. The detachable crutches according to claim 1 , wherein each of the crutches further comprises a handgrip, extending outwards in the longitudinal direction, and a manipulation unit provided at the handgrip,

wherein the manipulation unit comprises buttons for controlling operation of at least one of a wearable robot or the crutches worn on a wearer, and

wherein one of the metal ball and the holder is formed as an electromagnet so that a magnetic force between the metal ball and the holder is changed by the manipulation unit.

11. The detachable crutches according to claim 1 , wherein the holder is provided with a hook switch configured to be turned on or off depending on attachment or detachment of the metal ball from the holder, and

wherein the sensor senses current flowing through an electric wire when the hook switch is turned on with attachment of the metal ball to the holder, thereby sensing attachment or detachment of the metal ball and the holder from each other.

12. A method of controlling a pair of detachable crutches, the method comprising:

providing the pair of detachable crutches, each of the detachable crutches comprising:

a metal ball having magnetic properties;

a holder having magnetic properties,

wherein a magnetic force is generated between the metal ball provided at one of the crutches and the holder provided at a remaining one of the crutches so as to maintain attachment therebetween; and

a sensor configured to sense whether the metal ball and the holder have been attached to each other;

sensing, by the sensor, whether the metal ball provided at one of the crutches and the holder provided at the remaining one of the crutches have been attached to each other; and

when attachment of the metal ball and the holder to each other is sensed, deactivating a button for controlling operation of at least one of a wearable robot or the crutches worn on a wearer, the button being provided at a handgrip formed so as to extend outwards from the one of the crutches in the longitudinal direction.

13. The method according to claim 12 , wherein the metal ball and the holder are formed as permanent magnets that generate a magnetic force to attract each other,

wherein the sensor is an electromagnetic wave sensor configured to sense an electromagnetic wave, and

wherein, in the sensing, the electromagnetic wave sensor senses an electromagnetic wave that varies depending on attachment or detachment of the metal ball and the holder from each other.

14. The method according to claim 12 , wherein the metal ball comprises protruding portions coupled to an outer surface thereof via elastic members,

wherein the holder comprises receiving recesses into which the protruding portions are inserted when the metal ball is attached to the holder, and

wherein, in the sensing, the sensor senses current flowing through electric wires connected to two opposite sides of the holder when the protruding portions are inserted into the receiving recesses, thereby sensing attachment or detachment of the metal ball and the holder from each other.

15. The method according to claim 12 , wherein the holder is provided with a hook switch configured to be turned on or off depending on attachment or detachment of the metal ball from the holder, and

wherein, in the sensing, the sensor senses current flowing through an electric wire when the hook switch is turned on with attachment of the metal ball to the holder, thereby sensing attachment or detachment of the metal ball and the holder from each other.