| 摘要 |
A closure device comprising at least one set of panels movable between an extended and retracted position to selectively secure a portal such as a door or window when the panels are in the extended position, the set of panels comprises at least two panel members hingedly attached to each other to permit selective extension and retraction of the set of panels on an upper and lower track, each panel member comprising a pair of elongated panel elements held in substantially parallel spaced relation relative to each by an upper and lower plate coupled to opposite ends thereof, an upper and lower attachment device is coupled to the mid-portion of upper and lower plate respectively to operatively mount the set of panels between the upper and lower track and a lock device movable between a first and second position disposed to engage the panels when in the first position to secure the panels in the extended position to prevent entry through the portal and to disengage the panels when in the second position to permit movement of the panels to the retracted position to provide entry through the portal.
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