Inexpensive keyless user custom coded lock

摘要

Very simple, inexpensive keyless window sash combination code lock has a pivotable cover plate for preventing an intruder from unscrewing the conventional screws for mounting the lock to the sashes. Three combination code dials are slip coupled to associated rotatable pins which pass through the cover plate and an apertured anchor plate. The pins have lugs positioned under the anchor plate to prevent the lock from being opened. When the lugs are positioned within the anchor plate upon installation, the user rotates the dials to create his own custom combination code. The cover plate is then lowered, the dials are rotated and the lock is locked. The code dials are press fitted about the cylindrical locking pins to save manufacturing costs, and the manual sensing of the correct positioning of the code dials by an intruder, to open the lock, is prevented by providing radial dummy recesses in the lower surface of the anchor plate about each locking pin.