Claims
- 1. A locking device slidably mounted in a jamb and locking in place against the jamb upon tilting of a window sash away from the vertical axis of the jamb, the locking device comprising:
- a shoe comprising a first arm having a projection extending therefrom, a second arm, and a plurality of raised prongs disposed between the first arm and the second arm;
- a coupling member for coupling the second arm to a spring balance; and
- a pin disposed within a U-shaped opening formed by the first arm and the second arm, the pin having a first end for engaging a window sash, a second end forming a tab for engaging a wall of the shoe, and a middle portion engaging at least one of the plurality of prongs, such that upon tilting the window sash, the pin rotates the shoe, causing the projection to engage the jamb and lock the shoe within the jamb.
- 2. The locking device according to claim 1, wherein the second arm has a bore defined therein for receiving the coupling member.
- 3. The locking device according to claim 2, wherein the coupling member comprises a balance cord having a retaining member at an end thereof.
- 4. The locking device of claim 2, wherein the coupling member comprises a wire-form coupling for retaining a balance cord.
- 5. The locking device according to claim 1, wherein the second arm has a sharp end for engaging the jamb as the pin rotates.
- 6. The locking device according to claim 5, wherein a length of the shoe is greatest between the projection and the sharp end.
- 7. The locking device according to claim 6, wherein the length of the shoe is about equal to a width of an interior space defined by the jamb, such that the shoe forms a wedge within the jamb when the pin rotates.
- 8. The locking device according to claim 1, wherein the first arm has a first bore defined therein for removably receiving the projection.
- 9. The locking device according to claim 1, the first arm further comprising an integrally formed retaining prong for limiting the angle at which the pin can be removed from engagement with the shoe.
- 10. The locking device according to claim 1, wherein the projection comprises a barb.
- 11. A locking system for a tiltable window sash comprising:
- a shoe comprising:
- a first arm having a first projection disposed at an end of the first arm;
- a second arm connected to the first arm, having a second projection comprising an angled edge disposed at an end of the second arm; and
- a plurality of integrally formed retaining prongs disposed between the first arm and the second arm;
- a pin disposed between the first arm and the second arm, the pin having a first end affixable to a window sash, a second end having a tab engaging the shoe, and a middle section of reduced diameter adjacent the tab engaging the retaining prongs; and
- a spring balance comprising:
- a spring; and
- a pulley cord having a first end attached to the spring and a second end coupled to the second arm of the shoe to transmit a spring force therebetween;
- whereby in response to rotation of the pin, the pin rotates the shoe and the shoe forms a wedge when disposed within a jamb to counter the spring force.
- 12. The locking system of claim 11, wherein the shoe further comprises a third arm coextenstive with the first arm, having a third projection disposed at an end thereof.
- 13. The locking system of claim 11, wherein at least one of the retaining prongs inhibits removal of the pin at predetermined angles to a horizontal axis of the shoe.
- 14. The locking system of claim 11, wherein a length of the shoe is greatest between the first projection and the angled edge.
- 15. The locking system of claim 11, wherein the first projection and the second projection each comprise a barb.
- 16. The locking device according to claim 11, wherein the second arm includes a bore extending therethrough.
- 17. The locking system of claim 16, wherein the pulley cord is disposed within the bore and secured to the second arm by a retaining member.
- 18. The locking system of claim 16, further comprising a wire-form coupling disposed within the bore, the wire-form coupling having a looped end for securing the pulley cord.
- 19. The locking device according to claim 11, wherein the shoe is sized to be removable through a plough opening in the jamb.
- 20. A locking device rotatably coupled to a window sash and a spring balance, the locking device locking in place upon tilting of the window sash away from a vertical axis of a jamb, the locking device comprising:
- a shoe comprising:
- a first arm having a bore disposed therein;
- a barb removably disposed within the bore in the first arm for engaging the jamb;
- a second arm connected to the first arm and forming a U-shape therewith, the second arm having a first end having a bore disposed therein for receiving an end of a spring balance cord, and a second end having an angled edge for engaging the jamb, wherein a length of the shoe is greatest between the angled edge and the barb;
- a plurality of prongs integrally formed in the shoe and disposed between the first arm and the second arm for retaining a sash pin during installation of the device in a window frame; and
- a sash pin disposed between the first arm and the second arm, the sash pin comprising:
- a first end for engaging the window sash;
- a second end forming a tab for engaging a wall of the shoe, the tab having a diameter greater than the diameter of the first end; and
- a middle portion for engaging at least one prong;
- wherein the sash pin rotates the shoe as the window sash tilts away from the vertical axis of the jamb, causing the barb and the angled edge to engage the jamb and become wedged within the jamb.
- 21. The locking device according to claim 20, wherein the length of the shoe is about equal to a width of a sash-engaging portion defined by the jamb.
- 22. The locking device according to claim 20, wherein a width of the shoe is less than a width of a plough opening formed in the jamb, such that the shoe is removable through the plough opening.
Parent Case Info
This application is a continuation in part of Ser. No. 08/687,684, filed Jul. 26, 1996, now U.S. Pat. No. 5,737,877.
US Referenced Citations (21)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1002338 |
Aug 1965 |
GBX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
687684 |
Jul 1996 |
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