| CPC E06B 9/42 (2013.01) [E06B 9/78 (2013.01); E06B 9/90 (2013.01)] | 12 Claims |
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1. A roller blind drive device preventing an accident due to a drive cord, the drive device being configured to lower or raise a curtain fabric by performing at least one of forward rotation and reverse rotation of a drum on which the curtain fabric is wound, the drive device comprising:
a fixed part disposed fixedly at a side of the drum;
a rotating part mounted rotatably to the fixed part and configured to perform the at least one of forward rotation and reverse rotation of the drum with which the curtain fabric is lowered or raised;
a drive cord; and
a manipulating part,
wherein, the drive cord comprises:
a front cord and a rear cord which are connected to the rotating part in an infinite loop with which the front and the rear cord rotate in a same direction and hang toward a lower side of the fixed part, the front cord and the rear cord are spaced apart from each other, and
the manipulating part connected to the drive cord at the lower side of the fixed part, the manipulating part being configured to perform at least one of forward rotation and reverse rotation of the drive cord by selectively gripping the front cord or the rear cord according to rotating and pulling manipulations of the manipulating part performed by a user,
wherein, the manipulating part comprises:
a manipulation cover disposed to cover the drive cord at the lower side of the fixed part, and receiving the front and rear cords of the drive cord, the front and rear cords are separated from each other in a front-to-rear direction and move upward and downward;
a holding member mounted to a center of the manipulation cover and slides forward and backward, the holding member being configured to press and hold the front and rear cords according to the forward and backward movements of the holding member, respectively;
a rotating member being rotatably mounted to a lower end of the manipulation cover and connected to the holding member, the rotating member moves the holding member forward and backward;
a manipulation tube mounted to a lower end of the rotating member configured to receive at least one of forward rotational force and reverse rotational force of the rotating member and downward movement force of the front and rear cords from a user through the drive cord;
a connecting member mounted in a center of the manipulation tube and connected to the drive cord in an infinite loop; and
a tension spring being mounted to a center of a lower end of the manipulation tube and connected to the connecting member, the tension spring allows the drive cord to be maintained in predetermined tension by pulling the connecting member down and allowing the manipulation cover to return to a raised position adjacent to the fixed part,
the manipulation cover comprises:
an inner cover disposed on one side of a lower part of the fixed part and, receiving the front and rear cords, the holding member, and the rotating member;
an outer cover mounted to the inner cover to cover the inner cover, the outer cover restricting the front and rear cords, the holding member, and the rotating member such that the front and rear cords, the holding member, and the rotating member are mounted in the inner cover;
a cover guide protruding on an upper end of each of the inner and outer covers, the cover guide configured to return to an original position by interfering with a lower end portion of the fixed part;
a plurality of separating protrusion parts on upper and lower ends of one surface of the inner cover by having predetermined lengths, the separating protrusion parts separating the front and rear cords from each other, the front and rear cords move upward and downward;
a guide rail protruding on a center of one surface of each of the inner and outer covers, the guide rail is horizontal in the front-to-rear direction, the guide rail supporting the holding member to slide forward and backward;
an elastic plate protruding on a center of the outer cover by being cut in a U shape, the elastic plate is bent leftward and rightward according to the sliding of the holding member;
a hold protrusion part protruding on a center of one surface of the elastic plate by having a cone shape, the manipulation cover is engaged with the holding member so as to hold the holding member at a position to which the holding member slides;
a rotation groove part recessed in a lower end of one surface of each of the inner and outer covers by being stepped in a semicircular shape, the rotation groove part being configured to restrict the rotating member; and
a hold groove part recessed in a lower end of one surface of each of the inner and outer covers by being stepped in an arc shape, the hold groove part is configured to interfere with the rotating member limiting a rotation range of the rotating member.
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