Lift-off shoe system for tilt window
AssigneeCaldwell Manufacturing Company
InventorNorman R. Westfall
Life of this patent
Estimating the term…
Abstract
A lift-off shoe system uses non-locking sash support shoes (30) movable vertically and spring biased upwardly in a tilt window. Sash pins (25) have heads (26) that interlock with open top slots (31) in sash shoes (30) so that the sash pins are removable from the shoes only by lifting the pins vertically from above the uppermost position of the shoes. This simplifies the shoes, eliminates damage caused by shoe-locking mechanisms, and makes sash removal and replacement simple and convenient.
Claims30
A shoe system for a tilt window having a sash that moves vertically between a pair of jamb liners, tilts from the plane of said jamb liners, and has a pair of sash pins that extend into a pair of spring counterbalanced, nonlocking shoes that move vertically within said jamb liners, said shoe system comprising:
- a. said shoes having top opening slots that receive said sash pins;
- b. said pins having heads that interlock with said slots and prevent lateral withdrawal of said pins from said shoes;
- and
- c. said pins being removable from said shoes only by lifting said pins upward out of said top opening slots into a region above uppermost positions of said shoes.
In a tilt window having a tilt sash moving vertically between a pair of jamb liners holding vertically movable, non-locking sash shoes that engage pins extending from said sash into said jamb liners, the improvement comprising:
- a. said pins having heads and said shoes having open top slots receiving said pins so that said heads prevent lateral withdrawal of said pins from said shoes;
- b. a counterbalance spring system arranged for biasing each of said shoes upward with said pins to an uppermost position of said shoes where said pins can be removed from said shoes by being lifted upward from said slots to a region above said uppermost positions of said shoes;
- and
- c. said counterbalance spring systems having elements connected to said shoes in positions offset from said pins by a distance that is large enough relative to the vertical height of said shoes to cant said shoes within said jamb liners so that corners of said shoes engage said jamb liners with sufficient friction to overcome hop and drop of said sash.
A method of removing and replacing a sash of a tilt window, said method comprising:
- a. tilting said sash out of the plane of jamb liners for said window, without locking spring-balanced sash shoes supporting said sash within said jamb liner;
- b. holding an upper region of the tilted out sash while allowing said sash shoes to rise to their uppermost shoe positions within said jamb liners;
- c. lifting headed sash pins out of open top slots in said shoes to lift said sash pins clear of said shoes above said uppermost positions of said shoes;
- d. slanting said sash with said pins above said shoes to remove said pins from said jamb liners and then removing said sash from said window;
- e. reinserting said sash pins into said jamb liners above said uppermost positions of said shoes;
- f. lowering said pins into said open top slots of said shoes so that heads of said pins engage said shoes;
- g. lowering said shoes with said sash pins and said sash below said uppermost positions of said shoes;
- and
- h. tilting said sash back into said plane of said jamb liners.
A lift-off shoe and sash pin combination for a tilt window, said shoe having a body shaped to run in a vertical channel of said jamb liner, and said combination comprising:
- a. said body being formed of a single piece of resin material having an open top slot;
- b. said slot having a narrow region on a sashconfronting side of said shoe and a wider region spaced from said sash-confronting side of said shoe;
- c. a head of said sash pin being sized for lowering down into said wider region, and being unable to pass through said narrow region so that said narrow region prevents lateral withdrawal of said head in any angular orientation of said pin;
- d. a stem of said sash pin being sized to extend through said narrow region;
- and
- e. said pin being removable upward from said open top slot for withdrawal from said shoe in any angular orientation of said pin.
Dependencies are inferred from the claim text.