Drive systems and hinged window assemblies incorporating the same

A hinged window assembly comprising:

• a movable sash rotatably attached to a window in a window frame, wherein the movable sash is attached to the window frame such that the movable sash can be rotated relative to the window frame;
• a linkage connected to the window frame and the movable sash;
• and
• a drive system operably connected to the linkage, wherein the drive system and the linkage are configured to rotate the movable sash relative to the window frame, wherein the drive system comprises:
• a linkage driver fixedly mounted on a drive shaft, wherein the drive shaft defines a shaft axis extending along a length of the drive shaft, wherein rotating the drive shaft about the shaft axis rotates the linkage driver about the shaft axis, and wherein rotation of the linkage driver operates the linkage such that the movable sash rotates;
• a motor comprising an output shaft;
• a motor coupling apparatus operably connected to the drive shaft and the output shaft, wherein the motor coupling apparatus is configured to selectively couple or decouple the output shaft and the drive shaft;
• a hand crank gear attached to the drive shaft, wherein rotation of the hand crank gear about the drive shaft axis rotates the drive shaft about the shaft axis;
• a hand crank apparatus comprising a hand crank lever configured to rotate about a hand crank axis;
• a hand crank coupling apparatus configured to selectively couple and decouple the hand crank lever and a driven bevel gear, when the hand crank coupling apparatus is in a manual configuration, rotation of the hand crank lever about the hand crank axis causes the driven bevel gear to rotate about the hand crank axis;
• wherein the hand crank gear comprises a bevel gear and wherein the driven bevel gear meshes with the hand crank gear such that, when the hand crank coupling apparatus is in the manual configuration, rotation of the hand crank lever about the hand crank axis rotates the driven bevel gear about the hand crank axis, wherein the rotation of the driven bevel gear about the hand crank axis rotates the hand crank gear about the shaft axis causing the drive shaft, and the linkage driver to rotate about the drive shaft axis.