초록 ▼

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 c

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.

대표청구항 ▼

A service window comprising: a window frame; first and second window panels secured to said frame for rotation about first and second generally vertical hinges between open and closed positions; first hinge actuator secured to said first hinge for rotation with said hinge about a common axis with sa

A service window comprising: a window frame; first and second window panels secured to said frame for rotation about first and second generally vertical hinges between open and closed positions; first hinge actuator secured to said first hinge for rotation with said hinge about a common axis with said first hinge; second hinge actuator secured to said second hinge for rotation with said hinge about a common axis with said second hinge; rigid tie rod connector between said first and second hinge actuators for translating rotation of said first hinge into counterrotation of said second hinge; push rod extending generally outwardly from the plane of said panels when in said closed position for receiving window-actuating forces; direction changing linkage means coupled between said push rod and said first hinge actuator for translating said window-actuating forces into rotational movement of said first hinge; wherein said direction changing linkage means comprises a one piece pivot member articulated to said push rod means at a first point on said pivot member; and an extension bar means rigidly secured to said first hinge actuator and articulated to said pivot member at a second point on said pivot member whereby displacement of push rod causes rotational movement relative to said second point.