Window with pivotable sash and mechanism for locking the sash in

Details Window with pivotable sash and mechanism for locking the sash in Window with pivotable sash and mechanism for locking the sash in

1991-04-15

1992-05-12

Kannan, Philip C.

Movable or removable closures

Operator interrelated with closure latch release

49 13, 49394, E05F 1102

Patent

active

051116154

ABSTRACT:
A casement window wherein the sash is pivotable in the frame about a vertical axis has a self-locking crank drive which pivots the sash between open and closed positions by way of a pivotable lever, a link which is coupled to the lever, and an actuator which is movably installed in the sash, which is coupled to the link and which forms part of a locking-unlocking mechanism for the sash. The first stage of rotation of the crank drive in order to pivot the sash from closed position involves a displacement of the actuator which ensures that the sash is unlocked, and further rotation of the crank drive results in pivoting of the sash to the open position. If the direction of rotation of the crank drive is reversed, the sash is moved to the closed position before the actuator is caused to lock the sash to the frame. A blocking device for the actuator is operated by the frame to release the actuator for movement to its operative position shortly before the sash reaches the closed position. To this end, a mobile blocking element of the blocking device is installed in the sash and is displaced by the frame before the sash reassumes its closed position whereby the blocking element releases the actuator which is held in the inoperative position while the sash is held in an open or partly open position.

REFERENCES:
patent: 2114645 (1938-04-01), Benschoten
patent: 2366613 (1945-01-01), Hagstrom
patent: 4497135 (1985-02-01), Vetter
patent: 4617758 (1986-10-01), Vetter
patent: 4887392 (1989-12-01), Lense

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