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US 4,227,725 AGranted
Sliding closure lock latch
OwnerMorris W. Lindquist, Henry P. Hinesinventors
Life of this patent
Estimating the term…
Abstract
A lock latch assembly for sliding closures (windows and patio doors) which is placed to limit the opening of such closures beyond an adjusted position and which prevents access through the closure opening. A simple integral notched plate as one element and a swiveled pin as a second element provides the structure, each held by fasteners which have substantially resistance in shear to any forcing of the closures.
Claims1
A safety lock latch for vertically sliding closures having a sash frame slidable vertically between vertical frame members,
- (a) an elongate plate having a plurality of spaced, unconnected openings therethrough, each said opening extending to a common edge of said plate,
- (b) a vertical frame member adjacent and forming a support for a sliding window sash frame,
- (c) means fastening said elongate plate on said frame member adjacent, parallel to, and overlying but spaced from said sash for sliding clearance,
- (d) a lock pin to position laterally of said plate dimensioned selectively to enter and engage any one of said spaced openings in said plate, and
- (e) a swing plate pivotally mounted on said sash frame between said sash and said elongate frame and carrying said lock pin, said swing plate being movable on a horizontal axis to a release position wherein said lock pin clears said elongate plate to allow free vertical movement of said sash and being movable to a substantially vertical position to engage one of said spaced openings to limit the movement of said sash frame until said swing plate is manually shifted to the release position.
2 more elements
Dependencies are inferred from the claim text.