Tumbler lock
OwnerEdmond Uherinventor
Life of this patent
Estimating the term…
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.
Claims8
A tumbler lock comprising:
- an outer cylinder having two longitudinal recesses staggered by 180.degree.,
- an inner cylinder having guide slots and mounted in said outer cylinder,
- at least two springless plate-type tumblers associated with said inner cylinder, freely movable in said guide slots and engaging, in the locked state, in one of said longitudinal recesses of said outer cylinder, whereby said inner cylinder is prevented from rotating relative to said outer cylinder,
- said tumblers being provided with windows for a key and which, during insertion of the key, move in both directions of motion through the key profile from the area of said longitudinal recess to the area of said inner cylinder, the open position, so that said inner cylinder can rotate, and
- protective strips connected to said inner cylinder, and covering in the area of the key guide the side flanks of said windows which are parallel to the direction of motion of said tumblers,
- said inner cylinder including a guide profile into which, after insertion of said tumblers, said protective strips can be pushed into said guide slots to cover all the side of flanks of said windows provided in said tumblers and located in the area of the key guide, and
- said protective strips, in conjunction with a matched window size serving as stops for said tumblers in the locked state, so that the plunging depths of said individual tumblers into said longitudinal recess on said outer cylinder are determined.
Dependencies are inferred from the claim text.