| 摘要 |
The invention concerns a guide device for a winding shaft (4) of a material handling door (1) comprising vertical members (2, 3) including in their upper part a bore (11) traversed by the actuator (13) of the shaft (4) such that each bearing (14, 15) co-operates with a plate (16) fixed on the profile of the vertical members to guide said shaft (4) in rotation, while the bore (11) comprises means for braking the actuator (13) when a bearing (14, 15) and/or the corresponding plate (16) is broken thereby preventing the shaft (4) from falling vertically and for lowering the flexible curtain.
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