Foldable unmanned aerial vehicle

1. An unmanned aerial vehicle comprising:

a rotor comprising a rotary wing;

a bar-shaped arm supporting the rotor; and

an arm connector to which the arm is connected,

wherein the arm connector comprises an arm holder that is a fixing member holding a part of the arm in a longitudinal direction of the arm,

wherein the part of the arm held by the arm holder is changeable by sliding the arm in the longitudinal direction of the arm relative to the arm holder,

wherein a base end of the arm protrudes from the arm holder when the arm is slid in a direction of the arm holder, the base end being an end of the arm furthest from the rotor, and

wherein the arm holder is a movable member movable in directions in which the arm is turned upward and downward and/or rightward and leftward.

2. The unmanned aerial vehicle according to claim 1 , wherein a range over which the arm holder is configured to turn the arm upward and downward has an upper limit defined by a position of the arm in flight.

3. The unmanned aerial vehicle according to claim 1 ,

wherein the arm connector comprises an arm holder support member comprising a pair of planar members arranged in parallel with each other with the arm holder held between the pair of planar members,

wherein each planar member of the planar members constituting the arm holder support member comprises, on a plate surface of the each planar member,

an arcuate long hole, and

either (i) an aperture bored at a center of an imaginary circle including the long hole as an arc, or (ii) a boss protruding toward the other planar member of the planar members from a center of an imaginary circle including the long hole as an arc, the long hole of one planar member and the long hole of the other planar member being disposed at positions corresponding to each other, the aperture or the boss of the one planar member and the aperture or the boss of the other planar member being disposed at positions corresponding to each other, and

wherein over an angle range defined by the long hole, the arm holder supported by the arm connector is rotationally movable about a rotational movement center located at a position corresponding to the aperture or the boss.

4. The unmanned aerial vehicle according to claim 3 ,

wherein the each planar member of the planar members constituting the arm holder support member comprises, on the plate surface of the each planar member,

the arcuate long hole, and

the aperture bored at the center of the imaginary circle including the long hole as the arc, the long hole of the one planar member and the long hole of the other planar member being disposed at positions corresponding to each other, the aperture of the one planar member and the aperture of the other planar member being disposed at positions corresponding to each other,

wherein the arm holder comprises

screw holes formed at positions corresponding to the respective long holes, and

axis holes formed at positions corresponding to the respective apertures and connecting the apertures to each other,

wherein a screw member is screwed in the screw holes through the long holes, and

wherein a core bar passes through the apertures and the axis holes.

5. An unmanned aerial vehicle comprising:

a rotor comprising a rotary wing;

an arm supporting the rotor and made of a cylindrical pipe material; and

an arm connector to which the arm is connected,

wherein the arm comprises a hinge on which the arm is foldable at a middle portion of the arm,

wherein the arm connector comprises an arm holder that is a fixing member holding a part of the arm in a longitudinal direction of the arm, and

wherein the part of the arm held by the arm holder is changeable by sliding the arm in the longitudinal direction of the arm relative to the arm holder,

wherein the arm comprises an arm side fitting member that is a fitting member to prevent the arm from rotating in a circumferential direction,

wherein in the longitudinal direction of the arm, the arm has

a leading end portion at which the rotor is disposed, and

a rear end portion opposite to the leading end portion, and

wherein when the arm has been slid to a limit extent in a direction of the leading end portion relative to the arm holder, the arm side fitting member is fitted with a fixation side fitting member that is a fitting member to form a pair with the arm side fitting member.

6. The unmanned aerial vehicle according to claim 5 ,

wherein the arm side fitting member is a pin protruding from the rear end portion of the arm,

wherein the pin protrudes in the direction of the leading end portion of the arm in parallel with the arm, and

wherein the fixation side fitting member is a pin hole formed in the arm holder.