| 摘要 |
<p>In various aspects, the invention provides frameless modular security bar assemblies adapted to be mounted in a pre-existing frame, such as a frame that defines a window or door opening. The assemblies may be provided with bars that are slidably, or slidably and pivotally, received by channels attached to opposing sides of the opening. The slidable connection of the bars and the channels may for example be adapted to accommodate shifts in the size or configuration of the framed opening, as for example may occur as a building settles. The slidable, or slidable and pivotal, attachment of the bars and the channels may also facilitate installation of security bar assemblies using methods of the invention. The bars and channels may be sized so that the bar ends are slidably, or slidably and pivotally, retained in the channels when the assembly is installed in a framed opening, the frame in effect serving to slidably, or slidably and pivotally, retain the bars in opposing channels, while the bars are permitted some freedom of lengthways, or lengthways and pivotal movement while being retained. Noise reduction sleeves may be used to insulate the slidable, or slidable and pivotal, connection between the bars and the channels, so as to minimize sound generated by movement of the bars relative to the channels, for example to prevent rattling of the bars in the channels. Adjustable shutter vanes may also be provided, adapted either for installation at the same time as the security bar assemblies of the invention, or by later retrofitting of existing installations.</p> |
