Shutter assemblies and laths for them
AssigneeAlsecure Limited
InventorGeorge A. Cooper
Life of this patent
Estimating the term…
Abstract
A shutter assembly has a plurality of laths which extend between a pair of vertically extending side channels disposed to either side of a doorway, window or the like. A number of the laths are strengthened and are hollow box sections through which a pair of wire cables extend. The wire cables are anchored to retention members which can move vertically in the side channels. The remaining laths have windlocks at their ends which are located in and are moveable in the side channels. The wire strengthened laths are alternately interlaced with the remaining laths. The wire cables give additional strength to the strengthened laths and are sufficiently strong to withstand a heavy blow to the shutter assembly in the vicinity of the strengthened laths, extending with the blow and thereby absorbing energy rather than breaking.
Claims21
A shutter assembly comprises a pair of side channels, a plurality of laths extending between said side channels, at least one of said laths having a main body and a multi-stranded member, each end of said multi-stranded member being retained to a respective said side channel by retention means associated with said multi-stranded member, wherein said multi-stranded member is adapted to extend as a consequence of a heavy blow being applied to the shutter assembly.
A shutter assembly comprises a pair of side channels, a plurality of laths extending between said side channels, at least one of said laths having a main body and a longitudinally extensible member, each end of said extensible member being retained to a respective said side channel by retention means associated with said extensible member, wherein said extensible member is adapted to extend progressively as a consequence of a heavy blow being applied to the shutter assembly.
A lath for a shutter assembly comprises a lath body, an extensible member associated with said body, a first lug provided at a first end of said member, a second lug provided at a second end of said member, and wherein at least one of said lugs is adapted to be received in a channel provided adjacent an aperture across which the lath extends in use, and wherein said extensible member is adapted to extend if said lath is deformed by an impact, said extensible member absorbing energy as it extends.
A method of strengthening shutters comprising putting extensible members through or beside laths of a shutter and retaining the ends of said extensible members in side members adjacent to the end of the laths.
Dependencies are inferred from the claim text.