Locking device for hinged door

A locking device of a hinged door (1) installed between a rotation opening side of the hinged door (1), which is installed in a door frame using a door hinge (1b) installed on one side of the door frame, and the door frame (1a), the locking device comprising:

• a plurality of close contact guide plates (130) installed on the rotation opening side of the hinged door (1) to be separated from each other in a longitudinal direction;
• a plurality of pressure rolls (120) configured to achieve a compressed locked state by pulling the rotation opening side of the hinged door (1) toward the door frame (la) while in contact with the plurality of close contact guide plates (130) in a state in which the rotation opening side of the hinged door (1) is closed on the door frame (1a) and configured to be installed on the door frame (1a) to be separated from each other in the longitudinal direction to achieve an uncompressed locked state between the rotation opening side of the hinged door (1) and the door frame (1a) in a noncontact state with the plurality of close contact guide plates (130);
• a driving plate (110) installed in a sliding pocket (110a), provided in the door frame (1a) in the longitudinal direction so that the pressure rolls 120 are slidably installed on the door frame (1a) in the longitudinal direction, and having the plurality of pressure rolls (120) provided in the longitudinal direction;
• and a switching device (100) configured to induce a longitudinal movement displacement (H) corresponding to that of the driving plate (110) by being engaged with at least one first pressure roll (120a) of the pressure rolls (120) installed on the driving plate (110) to provide the longitudinal movement displacement (H), configured to generate the longitudinal movement displacement (H) of a second pressure roll 120b induced by the longitudinal movement displacement (H) of the driving plate (110), and installed on the door frame (1a) to allow the second pressure roll (120b) to be switched between a contact compressed state position with the plurality of close contact guide plates (130) and a noncontact and uncompressed state position with the plurality of close contact guide plates (130) by the longitudinal movement displacement (H), wherein the switching device (100) further includes:
• a housing (10) fixedly installed on the door frame (la);
• a rotatable lever (30) installed in the housing (10) by a first hinge pin (32) to rotate on a front surface of the housing in the longitudinal direction;
• a conversion link bar (40) having one end portion connected at a predetermined position between the first hinge pin (32) of the rotatable lever (30) and a rotation end portion;
• a sliding block (20) connected to an other end portion of the conversion link bar (40) by a third hinge pin (40b) to slide linearly in the housing (10) in the longitudinal direction according to a longitudinal rotation operation of the rotatable lever (30);
• a cover plate (50) configured to cover a rear surface of the housing (10) to limit a displacement of the sliding block (20) by the longitudinal rotation operation of the rotatable lever (30) to a longitudinal linear sliding displacement in the housing (10) and having a hole formed in the longitudinal direction to guide the longitudinal linear sliding displacement and having a size such as to limit the height of the longitudinal linear sliding displacement;
• and a slider fork (25) integrated with the sliding block (20), provided to protrude to an outside of a sliding guide groove (52) formed in the cover plate (50), and sliding along the sliding guide groove (52) in the longitudinal direction while being engaged with the first pressure roll (120a).