Drive systems and hinged window assemblies incorporating the same

A hinged window assembly comprising:

• a movable sash;
• 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 relative to the frame;
• a motor apparatus comprising an output shaft;
• a motor coupling apparatus operably connected to the drive shaft and the output shaft, wherein the motor coupling apparatus comprises a selective motor coupling apparatus configured to selectively couple or decouple the output shaft and the drive shaft;
• a hand crank gear fixedly attached to the drive shaft, wherein rotation of the hand crank gear about the drive shaft axis rotates the drive shaft;
• a hand crank apparatus operably connected to a drive gear, wherein the hand crank apparatus is movable between a manual configuration and a motorized configuration, wherein the drive gear engages the hand crank gear when the hand crank apparatus is in the manual configuration, and wherein movement of the hand crank apparatus from the manual configuration to the motorized configuration moves the drive gear away from the hand crank gear such that the drive gear does not engage the hand crank gear when the hand crank apparatus is in the motorized configuration, and further wherein the hand crank apparatus comprises a hand crank and rotation of the hand crank about a hand crank axis rotates the drive gear about the hand crank axis, wherein the hand crank axis extends through the drive gear and when the hand crank apparatus is in the manual configuration and the hand crank is rotated about the hand crank axis the drive gear rotates about the hand crank axis and rotates the hand crank gear, about the drive shaft axis, and wherein rotation of the hand crank gear about the drive shaft axis rotates the drive shaft and the linkage driver about the drive shaft axis;
• and
• an interlock switch operably connected to the motor coupling apparatus, wherein the interlock switch causes the selective motor coupling apparatus to couple the output shaft of the motor apparatus and the drive shaft only when the hand crank apparatus is in the motorized configuration.