| 摘要 |
Each sash of this double-hung tiltably-removable sliding sash window installation slides in an elongated channel sash guide containing a sash balancing spring anchored at its upper end thereto and connected at its lower end to a lock carrier upon which is rotatably mounted a pointed locking lever. This lever cooperates with an eccentric lock-operating pin mounted on the pivot boss of a block mounted in the lower portion of the groove in the opposite side edges of each sash in such a manner that when the sash is moved around its pivot bosses into the plane of the window frame, the eccentric pin on each side is automatically moved laterally relatively to its respective locking lever so as to push the locking lever out of its locking position, thereby releasing each of the opposite sash-balancing springs into its sash-balancing position. When, however, the sash is tilted outward for cleaning or removal, each eccentric pin is moved automatically sidewise in the opposite direction to push its associated locking lever into its locking position, whereupon the sash may be removed by swinging it sidewise in its tilted position while leaving the sash balance locking springs in their tensioned positions. The locking lever is mounted in its channel sash guide in a plane perpendicular to the plane of the sash.
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