| 摘要 |
PURPOSE: An auto-closing device of a fireproofing door is provided to utilize for an emergency case such as a fire by opening a fireproofing door compulsively as occasion demands and re-closing a fireproofing door automatically. CONSTITUTION: The auto-closing device of a fireproofing door contains a housing, a DC motor, a primary gear train, a driving unit(100), a sensing unit and a link unit. The driving unit(100) comprises a bearing gear unit composed of a primary bearing gear(110) and a secondary bearing gear(120), a driving shaft(140) and support members(151,156) for a driving unit. The primary bearing gear(110) is provided with a semi-globular bearing groove(112) formed on the outer circumference of an inserting pipe(130) extended from the outer side of a through hole and a ball bearing(114) formed in the center through hole, the secondary bearing gear(120) is provided with a bearing fitting hole(121) to insert a bearing(123) which is supported/projected elastically by a supporting spring(124) and a key penetrating hole(127), and interlocked with the primary bearing gear(110) by inserting the projected bearing(123) to the bearing groove(112), and the driving shaft(140) is inserted to the through holes of the primary and secondary bearing gears(110,120) and provided with a key groove corresponded to the key penetrating hole(127) to fix a fixing key to couple with primary and secondary bearings through primary, secondary support members and primary, secondary support rings on both sides of the housing, and fastened with the link unit. |
