Sash lock
OwnerFred Granberginventor
Life of this patent
Estimating the term…
Abstract
An automatically operable window sash lock having a gravity-biased latch plate locking element. The latch plate is biased to a locking position wherein the latch plate is engaged with a catch. The latch structure may be mounted on one window member and the catch may be mounted on an adjacent window member. The latch structure is arranged to cause the latch plate to move to the locked position automatically as the result of the window members being moved to a closed position. The latch structure is further arranged to be retained in a retracted position when it is desired to move the window members to an open position.
Claims13
In a sash lock latch structure having a base, a latch plate, means for mounting said latch plate to said base for movement between a latching position and a retracted position, and biasing means urging said latch plate to said latching position, the improvement comprising:
- a control member having a mounting portion, a plate lock portion, and a trip portion;
- mounting means mounting said mounting portion adjacent said base for free pivoting of said control member about a pivot axis substantially parallel to the direction of movement of said latch plate, and reciprocable rearward and forward movement of said mounting portion in the direction of said axis, said lock portion and trip portion being disposed at opposite ends of said mounting portion and extending radially therefrom, said trip portion extending angularly to the direction of radial extension of said lock portion, the control member being biased to pivot about said pivot axis in a first direction;
- first shoulder means movable with said latch plate for engaging said lock portion to urge the control member rearwardly to a withdrawn position when the latch plate is moved to said retracted position with said lock portion being biased into the path of movement of said shoulder means;
- second shoulder means movable with said latch plate for engaging said lock portion to urge the control member forwardly from said lock position to dispose said trip portion in a forward trip position;
- and
- third shoulder means on said base for limiting the forward movement of said lock portion to releasably retain the latch plate in the retracted position and the trip portion in the trip position, said lock portion being removed from engagement with said second shoulder means to permit said biasing means to pivot said latch plate from said retracted position to said latching position as a result of said trip portion being swung from the trip position by a pivoting of said control member in a second direction opposite to said first direction.
In a sash lock structure having a base, a latch plate, means for mounting said latch plate to said base for movement between a latching position and a retracted position, and biasing means urging said latch plate to said latching position, the improvement comprising:
- a control member having a mounting portion, a plate lock portion, and a trip portion;
- mounting means mounting said mounting portion adjacent said base for free pivoting of said control member about a pivot axis substantially parallel to the direction of movement of said latch plate, and reciprocable rearward and forward movement of said mounting portion in the direction of said axis, said lock portion and trip portion being disposed at opposite ends of said mounting portion and extending radially therefrom, said trip portion extending angularly to the direction of radial extension of said lock portion and having a weight effectively greater than that of said lock portion to gravity-bias the control member pivotally about said axis;
- first shoulder means movable with said latch plate for engaging said lock portion to urge the control member rearwardly to a withdrawn position when the latch plate is moved to said retracted position with said trip portion free to bias said control member to dispose said lock portion in the path of movement of said shoulder means;
- second shoulder means movable with said latch plate for engaging said lock portion to urge the control member forwardly from said lock position to dispose said trip portion in a forward trip position;
- and
- thrid shoulder means on said base for limiting the forward movement of said lock portion to releasably retain the latch plate in the retracted position and the trip portion in the trip position, said lock portion being removed from engagement with said second shoulder means to permit said biasing means to pivot said latch plate from said retracted position to said latching position as a result of said trip portion being swung against the gravitybias thereof from the trip position.
Dependencies are inferred from the claim text.