| 摘要 |
A system for support of a sash that is laterally removable from between opposed window jambs that uses sash support arms that are movably arranged for transferring the weight of the sash to the shoes and for bridging distances between the sash stiles and the shoes. When not supporting the weight of the sash, the support arms move to positions that allow the sash to be lifted off of counterbalance support shoes and laterall y removed from between the window jambs and conversely reinserted between window jambs and lowered onto the shoes. This is done while the shoes are locked in positions within the window jambs. When the support arms support the weight of the sash, they are in positions that rest the sash weight on the counterbalance shoes to support the weight of th e sash. The shoes have hooks that can be deployed to lock the shoes reliably in the jamb s by engaging projections formed in the jambs for this purpose. In the preferred embodiments, support arm latching members are provided on the hooks in the form of rear extension s that latch over interlock pins extending from the support arms when the hooks are disengaged from the jambs. Thus, the same hook elements that serve to hold the shoes in position when engaged to the jambs serve to further secure the support arms for the sash i n position on the shoes when disengaged from the jambs.
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