A low profile actuating window lock for casement windows having a handle actuate a lifter that slides vertically on a fork component in slidable communication with the window lock casing, the handle pivotable about the lifter and pivotable about a restrictor arm that pivots relative to the casing, a
A low profile actuating window lock for casement windows having a handle actuate a lifter that slides vertically on a fork component in slidable communication with the window lock casing, the handle pivotable about the lifter and pivotable about a restrictor arm that pivots relative to the casing, allowing the handle to rotate fully from the locked position to the unlocked position with low clearance from the window frame. The pivot points of the handle, lifter, restrictor arm configuration allow for an over center linkage that prevents back driving the casement window lock.
대표청구항▼
1. A casement window lock for securing a window sash to a casement window frame, said lock comprising: an elongated casing having a substantially horizontal sidewall section and a vertical section shorter in length than said sidewall section;a fork component adapted to engage a lock bar external to
1. A casement window lock for securing a window sash to a casement window frame, said lock comprising: an elongated casing having a substantially horizontal sidewall section and a vertical section shorter in length than said sidewall section;a fork component adapted to engage a lock bar external to said lock, said fork component in slidable communication with said casing;a lifter in slidable communication with said fork component;a restrictor arm pivotally attached to said casing;a plurality of hinges or pivot point forming an over center linkage to prevent back driving said lock, wherein said over center linkage includes:a first hinge point rotatably joining said handle to said lifter;a second hinge point rotatably joining said restrictor arm to said casing; anda third hinge point rotatably joining said restrictor arm to said casing; andsuch that when said handle is in an unlocked position, said first hinge point is between said second and third hinge points, and said second hinge point is in said locked position, said second hinge point is between said first and third hinge points, and said second hinge point is below an action line connecting said first and third hinge points;a handle pivotally attached at one end to said lifter, and pivotally attached at an intermediate point on said handle to said restrictor arm; andwherein upon rotation said handle engages said lifter to move said fork component horizontally along said casing horizontal sidewall section while simultaneously lifting or lowering said lifter relative to said fork component. 2. The casement window lock of claim 1, wherein said casing includes a first track for slidably engaging said fork component, and a second track for slidably engaging said lifter, said first track positioned horizontally about said casing horizontal sidewall section, and said second track having an angled portion slanting vertically relative to said horizontal position of said first track. 3. The casement window lock of claim 2 wherein said fork component includes a track for slidably communicating with said lifter such that said lifter moves vertically relative to said fork component when engaged by said handle. 4. The casement window lock of claim 2 wherein said fork component includes an extension attached to or integral with said fork component, extending perpendicular to said horizontal casing sidewall section for slidable engagement within said first track. 5. The casement window lock of claim 2 wherein said lifter includes a protrusion attached to or integral with said lifter, extending perpendicular to said horizontal casing sidewall section for slidable engagement with said second track. 6. The casement window lock of claim 1 including at least one detent formed on said restrictor arm to engage a detent spring located between said handle and said restrictor arm, said detent spring providing tactile and audible indication that said lock has reached an end of travel. 7. The casement window lock of claim 1 including a spring washer attached between said restrictor arm and said casing, said spring washer capable of providing force at minimal deflection. 8. The casement window lock of claim 1 including a slotted escutcheon attached to said casing. 9. The casement window lock of claim 8 including a retainer for securing said lock to a window frame, said retainer comprising a retainer body and a brush seal, wherein said retainer is placed on a window frame opposite said casement window lock, providing a surface for mounting screws through said window frame to said lock. 10. A casement window lock for securing a window sash to a casement window frame, said lock comprising: an elongated casing having a substantially horizontal sidewall section and a vertical section shorter in length than said sidewall section;a fork component adapted to engage a lock bar external to said lock, said fork component in slidable communication with said casing;a lifter in slidable communication with said fork component;a restrictor arm pivotally attached to said casing;a plurality of hinges or pivot points forming an over center linkage to prevent back driving said lock, wherein said over center linkage comprises a four bar linkage construction including:a first bar formed by said handle between a pivot connected at said lifter and a pivot connected at said restrictor arm;a second bar formed by said restrictor arm and pivoting at each end thereof;a third bar formed by said lifter and said lifter's relative vertical motion between the pivot point where said lifter connects to said handle, and said fork component; anda fourth bar formed by said fork component and horizontal sliding motion of said fork component relative to a fixed pivot point of said restrictor on said casing;a handle pivotally attached at one end to said lifter, and pivotally attached at an intermediate point on said handle to said restrictor arm; andwherein upon rotation said handle engages said lifter to move said fork component horizontally along said casing horizontal sidewall section while simultaneously lifting or lowering said lifter relative to said fork component. 11. The casement window lock of claim 10, wherein said casing includes a first track for slidably engaging said fork component, and a second track for slidably engaging said lifter, said first track positioned horizontally about said casing horizontal sidewall section, and said second track having an angled portion slanting vertically relative to said horizontal position of said first track. 12. The casement window lock of claim 2 wherein said fork component includes a track for slidably communicating with said lifter such that said lifter moves vertically relative to said fork component when engaged by said handle. 13. The casement window lock of claim 11 wherein said fork component includes an extension attached to or integral with said fork component, extending perpendicular to said horizontal casing sidewall section for slidable engagement within said first track. 14. The casement window lock of claim 11 wherein said lifter includes a protrusion attached to or integral with said lifter, extending perpendicular to said horizontal casing sidewall section for slidable engagement with said second track. 15. The casement window lock of claim 10 including at least one detent formed on said restrictor arm to engage a detent spring located between said handle and said restrictor arm, said detent spring providing tactile and audible indication that said lock has reached an end of travel. 16. The casement window lock of claim 10 including a spring washer attached between said restrictor arm and said casing, said spring washer capable of providing force at minimal deflection. 17. The casement window lock of claim 10 including a slotted escutcheon attached to said casing. 18. The casement window lock of claim 17 including a retainer for securing said lock to a window frame, said retainer comprising a retainer body and a brush seal, wherein said retainer is placed on a window frame opposite said casement window lock, providing a surface for mounting screws through said window frame to said lock.
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이 특허에 인용된 특허 (45)
Timothy, E. Erik; Minter, Peter, Actuator for use in fenestration systems.
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