Detachable lighting device

1. A detachable lighting device comprising:

a mounting rail comprising a plurality of fitting recesses and power terminals through which power is supplied; and

a lighting unit comprising:

an inner body detachably fitted into a fitting recess of the plurality of fitting recesses,

an outer body movable along the inner body and configured to lock or unlock the inner body in or from a fitted state based on a movement position of the outer body, and

a lamp disposed on the inner body and configured to emit light by receiving power when the inner body is mounted on the mounting rail,

wherein a lower portion of the outer body is configured to surround the lamp.

2. A detachable lighting device comprising:

a mounting rail comprising a plurality of fitting recesses and power terminals through which power is supplied; and

a lighting unit comprising:

an inner body detachably fitted into a fitting recess of the plurality of fitting recesses,

an outer body movable along the inner body and configured to lock or unlock the inner body in or from a fitted state based on a movement position of the outer body, and

a lamp disposed on the inner body and configured to emit light by receiving power when the inner body is mounted on the mounting rail,

wherein the outer body comprises: a first through-hole, second-through holes, and a deformation inducing protrusion, and

wherein the first and second-through holes are provided in an upper portion of the outer body to be spaced apart in a direction from a center toward edges, and the deformation inducing protrusion is provided in the first through-hole.

3. The detachable lighting device of claim 2 , wherein the inner body comprises fixing flanges formed on an upper portion thereof, the fixing flanges configured to extend through the first through-hole to be disposed on both sides of the deformation inducing protrusion, and

wherein each of the fixing flanges comprises holding protrusions provided on a distal end thereof to protrude inward and outward.

4. The detachable lighting device of claim 3 , wherein a distal end of the deformation inducing protrusion protrudes in a circumferential direction such that, when the outer body moves upwards or downwards, the deformation inducing protrusion causes the fixing flanges to be opened or closed, thereby causing the holding protrusions to be held by or separated from a corresponding fitting recess among the fitting recesses.

5. The detachable lighting device of claim 2 , wherein the lamp comprises:

a substrate part fixed to the outer body,

a light source part disposed on a lower portion of the substrate part to emit light, and

terminal portions extending from an upper portion of the substrate part through the second-through holes to be electrically connected to the power terminals.

6. The detachable lighting device of claim 5 , wherein the lamp further comprises a switch part configured to determine whether or not to operate the light source part, and

wherein the light source part is configured to emit light in a predetermined lighting mode based on a number of times or a length of time for which the switch part is touched.

7. The detachable lighting device of claim 1 , wherein the outer body comprises open holes on both sides in a first direction, and

wherein the inner body comprises holding portions on both sides in the first direction to be deformable in the first direction, the holding portions configured to be inserted into the open holes.

8. The detachable lighting device of claim 7 , wherein the holding portions of the inner body are configured to extend upward and protrude outward such that end portions thereof are inserted into the open holes, and

wherein upper ends of the end portions are inclined so as to slide when in contact with upper ends of the open holes, and lower ends of the end portions are configured to be held by the open holes when in contact with lower ends of the open holes.

9. The detachable lighting device of claim 1 , wherein the outer body comprises: open holes formed in sides of the outer body in a second direction, and holding portions provided in the open holes, respectively, each of the holding portions configured to be deformable in the second direction, and

wherein the inner body comprises support protrusions formed on sides of the inner body in the second direction.

10. The detachable lighting device of claim 9 , wherein each of the holding portions has a semicircular or triangular shape extending upward, with a distal end thereof protruding inward, and

wherein each of the support protrusions has a semicircular or triangular shape.

11. The detachable lighting device of claim 1 , wherein the mounting rail comprises an insertion recess formed in a longitudinal direction, the plurality of fitting recesses is provided along the insertion recess, and the power terminals are provided outside the insertion recess to extend along the insertion recess.

12. A detachable lighting device comprising:

a mounting rail comprising a plurality of fitting recesses and power terminals through which power is supplied; and

a lighting unit comprising:

an inner body detachably fitted into a fitting recess of the plurality of fitting recesses,

an outer body movable along the inner body and configured to lock or unlock the inner body in or from a fitted state based on a movement position of the outer body, and

a lamp disposed on the inner body and configured to emit light by receiving power when the inner body is mounted on the mounting rail,

wherein the outer body of the lighting unit comprises a fixing part and a tilting part,

the inner body is disposed in the fixing part to lock or unlock the inner body into or from the fitted state, and

the lamp is disposed in the tilting part and connected to the fixing part in a tiltable manner so as to change a direction of emitted light from the lamp.