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US 4,274,666 AGranted
Lock for sliding windows and doors
OwnerAlmo E. Peckinventor
Life of this patent
Estimating the term…
Abstract
A pressure-sensitive lock for sliding windows and doors has rotatable eccentric cam means adapted to be mounted on the sash of a sliding window or door so as to engage the adjacent window frame when the cam means is rotated into the locking position. The lock also has a pressure block for mounting on the opposite side of the window adjacent the frame, such that when the cam means is placed in locking position against the frame, the sliding window is forced toward the opposite frame and the pressure block is thereby wedged against the frame to prevent the window from opening.
Claims4
Locking means for sliding windows and doors, comprising:
- rotatable eccentric cam means for mounting on a window sash adjacent a window frame, said cam means having a generally arc-shaped contact face for engaging the window frame, said face having a leading edge and a trailing edge, with the radius between said face and the pivot point of said cam means gradually increasing from the leading edge to the trailing edge, so as to apply increasing pressure on the frame as the window is attempted to be opened;
- mounting means for mounting on the sash, and having means on which said cam means is rotatably mounted at said pivot point;
- and
- a pressure block for fixedly mounting on the window sash adjacent the window frame on the opposite side of the window from said cam means, so that when said cam means applies pressure on the frame, the frame transfers the pressure to said mounting block.
1 more element
Dependencies are inferred from the claim text.