Abstract: A sash coupling is adapted to be connected to one side of a sash which slides vertically in parallel channel sash guides mounted within a sliding sash window frame. Secured to the top of the sash coupling is the lower end of a flexible sash cable, the outer end of which extends upward to and around a stationary outer pulley pivotally mounted on a transverse pulley support at the top of the sash guide, whence an intermediate section of the cable extends downward to and around a vertically-movable traveling pulley mounted on a balancing-spring coupling to which the upper end of the elongated sash-balancing tension spring is hooked, whence an inner section of the cable extends upward to an anchorage on the upper end of the sash guide. The lower end of the elongated sash-balancing spring is hooked over the lower end of the sash guide. For a double-hung sliding sash installation, the upper sash is balanced in a similar manner.

Abstract: 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.