Abstract: A tumbler lock having an outer cylinder and an inner cylinder rotatably mounted therein with springless plate-shaped tumblers which move freely in guide slots. Tumbler locks of known construction can be opened by unauthorized persons because an object can be inserted through the windows in the plate-shaped tumblers required for the insertion of the key, wedged against the side faces of the windows and the tumblers lifted from their locked state. This is foreclosed in the invention because the side flanks of the windows in the area of the key guide which are parallel to the direction of the motion of the tumblers are covered by protective strips connected with the inner cylinder.

Abstract: An anchor windlass has a shaft on which an anchor-line sprocket is freely rotatable between an abutment fixed axially on the shaft and an entrainment emenet fixed rotationally but axially shiftable on this shaft. A nut threaded on the shaft bears via a stack of spring washers on this entrainment element and can be screwed axially forwardly on the shaft to wedge the sprocket between the entrainment element and the abutment to rotationally couple the sprocket to the shaft, and can be screwed axially backwardly on the shaft to allow free rotation of this sprocket on the shaft. A pawl and cam mechanism serves to automatically rotationally temporarily arrest the nut to screw it in the desired direction for coupling the sprocket to the shaft or uncoupling it therefrom.