Patent ID: 8641102
Filing Date: 2014-02-04
Classification: E05C,Y10T

Abstract:
1. A multistage lock comprising: a stationary frame being an annular framework and having an outer frame being an annular framework, mounted in and connected pivotally to the stationary frame, and having an inner frame mounted in and connected pivotally to the outer frame, and having a lock device mounted on the open stile of the outer frame and having wherein when the at least one handle is turned to allow the at least one outer main limiting protrusion on the outer sliding panel to engage with the first stopping protrusion of the outer main stop and the at least one inner main limiting protrusion on the inner sliding panel to engage with the third stopping protrusion of the inner main stop, the outer frame is closed relative to the stationary frame and the inner frame is closed relative to the outer frame; when the at least one handle is turned to allow the at least one outer main limiting protrusion on the outer sliding panel to be disposed between the first and second stopping protrusions of the outer main stop and the at least one inner main limiting protrusion on the inner sliding panel to engage with the fourth stopping protrusion of the inner main stop, the outer frame is opened relative to the stationary frame and the inner frame is closed relative to the outer frame; and when the at least one handle is turned to allow the at least one outer main limiting protrusion on the outer sliding panel to engage with the second stopping protrusion of the outer main stop and the at least one inner main limiting protrusion on the inner sliding panel to depart from the third and fourth stopping protrusions of the inner main stop, the outer frame is closed relative to the stationary frame and the inner frame is opened relative to the outer frame.