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US 5,110,165 AGranted
Biased check rail lock
AssigneeTruth Division of SPX Corporation
InventorStephen M. Piltingsrud
Life of this patent
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AssigneeTruth Division of SPX Corporation
InventorStephen M. Piltingsrud
Estimating the term…
A window lock has a window sash mounted housing with a cam which is manually pivotable between a locking position engaging a keeper on a second window sash and an open position clear of the keeper. A bearing post projects from the cam and a spring secured to the housing exerts a biasing force against the post. The spring is a leaf spring having a first portion bearing against the post when the cam is positioned toward the locking position from the neutral position, and a second portion bearing against the post when the cam is positioned toward the open position from the neutral position. A curved portion of the spring connects the first and second portions at an angle relative to each other, and bears against the post when the cam is in the neutral position. The spring biasing force is directed substantially toward the cam pivot axis when the cam is in a neutral position between the locking and open positions, and is overcenter toward the open or locking position when the cam is selectively positioned toward the open or locking position, respectively, from the neutral position. The cam pivots substantially 180.degree. between the open and locking positions, and the neutral position is about 70.degree. from the locking position and about 110.degree. from the open position.
In a window lock having a cam pivotable relative to a housing between a first position extending from said housing to engage a keeper to lock said window and a second position with substantially all of said cam located within said housing, the improvement comprising means for biasing said cam toward said second position when said cam is not in said first position and up to at least 60.degree. from said second position, where said biasing means does not bias said cam toward said second position when said cam is within at least 50.degree. of said first position.
In a window lock having a cam with a member thereon, said cam being pivotable relative to a housing between a first position extending from said housing to engage a keeper to lock said window and a second position with substantially all of said cam located within said housing, the improvement comprising a spring engaging said cam member to bias said cam toward said second position when said cam is not in said first position and up to at least 30.degree. from said second position, said cam further applying a biasing force against said member substantially toward the pivot axis of said cam when said cam is in a neutral position between said first position and said second position.
In a window lock having a cam pivotable relative to a housing between a first position extending from said housing to engage a keeper to lock said window and a second position with substantially all of said cam located within said housing, the improvement comprising means for biasing said cam toward said second position when said cam is non in said first position wherein said cam pivots substantially 180.degree. between said first and second positions, and said cam is in said neutral position when positioned substantially 70.degree. from said first position and substantially 110.degree. from said second position.
In a check rail lock having a cam manually pivotable about an axis with respect to a housing mountable on a first window sash, said cam pivoting between a locking position engaging a keeper on a second window sash and an open position clear of said keeper, the improvement comprising:
In a check rail lock having a cam manually pivotable about an axis with respect to a housing mountable on a first window sash, said cam pivoting between a locking position engaging a keeper on a second window sash and an open position clear of said keeper, the improvement comprising:
Dependencies are inferred from the claim text.