| 摘要 |
The present invention relates to a bottom-up door opening and closing device capable of improving convenience of use and reliability of operation by designing a door lifted in the predetermined location to be stopped while simply mechanically opening and closing the door without using the existing hydraulic or pneumatic structure. The bottom-up door opening and closing device comprises a body which has a fastening part having a screw thread in the lower end thereof and a first bracket combination part formed in the upper end thereof for the bracket combination and is formed in the internal hollow shape; a shaft of which a part is inserted into the inside of the body; and a connection socket which connects the shaft to the body by fastening the upper end thereof with the body and has a receiving part in which an access hole is formed so that the shaft can penetrate and a corresponding fastening part connected to the upper end of the receiving part to be screw combined with the fastening part of the body, wherein the shaft has the external diameter which becomes more enlarged toward the upper part. The bottom-up door opening and closing device further comprises a first stopper being received in the connection socket, being formed in the cylindrical shape so that the shaft can penetrate and having a first cutting part which is cut from the lower end to the upper part and a connection part which is not cut formed along the circumference in the lower part of the cylinder to stop/fixate the movement of the connection socket moved to the upper part along the shaft at the predetermined point. |
