Automatic foldable door of detachable type for showcase

1. An automatic detachable door of a detachable type for a showcase, the automatic detachable door comprising:

a plurality of foldable screens ( 30 ), of which a cover cap ( 40 ) is respectively fitted into upper and lower portions of the respective foldable screens ( 30 ), a first fitting protrusion ( 41 ) is mounted to one side of the upper cover cap ( 40 ), and a second fitting protrusion ( 47 ) is mounted to one side of the lower cover cap ( 40 ); and

upper and lower frames ( 20 and 22 ) which are provided with a plurality of fitting holes ( 23 ) at a certain interval,

wherein

power transmission members ( 70 ) are fitted into the fitting holes ( 23 ) of the upper frame ( 20 );

a center of the power transmission member ( 70 ) is provided with a protrusion receiving hole ( 71 ) for receiving the first fitting protrusion ( 41 );

rod receiving holes ( 73 ) are formed at symmetric positions at an equal distance from a center the protrusion receiving hole ( 71 );

a coil spring ( 81 ) and a powered rod ( 80 ) are sequentially inserted into the respective rod receiving holes ( 73 );

an upper portion of the protrusion receiving hole ( 71 ) is provided with a locking shoulder ( 72 ) on which a holding bolt ( 46 ) for holding the first fitting protrusion ( 41 ) is seated;

an upper portion of the first fitting protrusion ( 41 ) is provided at a center thereof with a fastening hole ( 45 ) to which the holding bolt ( 46 ) is fastened;

a lower portion of the first fitting protrusion ( 41 ) is provided with a protrusion body ( 42 ) having an outer diameter larger than an outer diameter of the first fitting protrusion ( 41 );

a top surface of the protrusion body ( 42 ) is provided with two seating holes ( 43 ) at two symmetric positions at an equal distance from the center of the first fitting protrusion ( 41 ), in which the seating holes ( 43 ) are formed to receive front ends of the rods ( 80 );

the protrusion body ( 42 ) is engaged to a protrusion body seating member ( 44 ) formed on a top surface of the cover cap ( 40 ); and

the plurality of foldable screens ( 30 ) are simultaneously opened or closed by a rotating member mounted to the upper frame ( 20 ).

2. The automatic detachable door of the detachable type for the showcase according to claim 1 , wherein a spacer ( 90 ) is mounted to the upper frame ( 20 ) to maintain an interval between the foldable screens ( 30 ) which are fully folded toward an inside of the showcase, and

rotation stoppers ( 91 ) are mounted to the lower frame ( 22 ) to prevent the foldable screens ( 30 ) from being further rotated and protruding forwardly from the showcase in a state in which the foldable screens are unfolded.

3. The automatic detachable door of the detachable type for the showcase according to claim 1 or 2 , wherein the rotating member is mounted to the upper frame ( 20 );

both inner sides of the upper frame ( 20 ) are provided with a pair of rail grooves ( 21 ), and a rail ( 55 ) is mounted on the respective rail grooves ( 21 );

a main movable member ( 50 ) is engaged to the upper portion of the respective rails ( 50 );

a top surface of the main movable member ( 50 ) is provided with a rack gear ( 51 ), and the rack gear ( 51 ) is meshed with a pinion gear ( 54 ) of a motor ( 53 );

rollers ( 52 ) are mounted to a bottom surface of the main movable member ( 50 );

a driven rotor ( 60 ) is mounted to an upper portion of the respective power transmission members ( 70 );

the driven rotor ( 60 ) is provided with a sliding hole ( 62 ) which penetrates the driven rotor ( 60 ); and

one end of a traction bar ( 61 ) which comes in or out of the sliding hole ( 62 ) is engaged to the rail ( 55 ), so that the driven rotor ( 60 ) is rotated by operation of the main movable member ( 50 ) to simultaneously open or close the plurality of foldable screens ( 30 ).