Removable-tilt-out window construction

In a tilt-out sash window comprising a frame including side jambs, at least one sash having side stiles, weather stripping secured to each of said side jambs, said weather stripping being shaped to receive said window stiles in slidable engagement, a longitudinal channel in said weather stripping on each side of said sash window, said channel having a back wall, spaced sidewalls and a front wall, at least one track integral with and extending perpendicularly away from said backwall toward said front wall in spaced parallel relationship with one of said sidewalls and a balance spring locking mechanism comprising:

• a slidable block in each of said longitudinal channels, said slidable block having at least one slot extending the length of one side of said slidable block through one face thereof
• said slidable block being positioned within said channel so that said slot is astride said track,
• said slidable block further having a central opening,
• a locking cam rotatably mounted in said central opening of said slidable block,
• spring means attached to said channel and said slidable block
• said locking cam being moveable into and out of engagement with said track so as to press said track into locking engagement with one side of said slot whereby said slidable block can be held fixedly in place with respect to said weather strip.

In a tilt-out sash window comprising a frame including side jambs, at least one sash having side stiles, weather stripping secured to said side jambs, said weather stripping being shaped to receive said window stiles in slidable engagement,

• a longitudinal channel in said weather stripping on each side of said sash window and a balance spring in each said channel;
• a balance spring locking mechanism comprising;
• a slidable block in said longitudinal channel;
• said slidable block having a first circular opening extending inwardly from a first face of said block, said block further having a second circular opening of greater diameter than said first circular opening extending inwardly from the faces of said block opposite said first face, said openings meeting each other centrally of the thickness of said block,
• said slidable block further having spaced wall means forming a pair of longitudinal slots extending from one end of said block to the opposite end of said block and forming the outer limits of said second circular opening,
• a rotatable locking cam having a first portion of a preset diameter and a second portion of greater diameter than said first portion, said rotatable cam being adapted to fit into said first and second circular openings,
• a pair of upstanding tracks attached to said weather stripping and being aligned with said slots,
• spring means attached to said weather stripping and to said block,
• means adapted to connect said window sash with said rotatable locking cam member to move said cam member from a first locked position in engagement with said track to a second unlocked position out of engagement with said tracks, whereby said block may be locked in a present location with respect to said side jamb.