Movable or removable closures – Closures interconnected for concurrent movement – Closures mounted for swinging
Patent
1986-07-30
1987-10-27
Kannan, Philip C.
Movable or removable closures
Closures interconnected for concurrent movement
Closures mounted for swinging
49356, 49388, 49394, 49501, E05F 1700, E05D 708, E06B 300
Patent
active
047020377
ABSTRACT:
The service window is constructed from a universal extruded framing member which can be cut to any desired window dimensions. A bell crank linkage with hip actuator or either of the pair of handles can be used to swing both doors open simultaneously about their respective vertical hinges. The bell crank linkage is mechanically efficient and space saving, and includes an automatic spring return mechanism. The handles are located over center with respect to the hinges. A U-shaped channel-formed member with wedge-shaped insert slips over the handles to prevent the window from being opened. The innermost edges of the handles confront the wedge insert to prevent the handles from following the arc trajectories followed during opening. These trajectories pass closest as they cross the plane between vertical hinges, thus, the wedge insert provides a solid, stable locking condition which is not readily jarred loose by vibration or prying.
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Hollowell John F.
Hollowell John R.
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