Mr. Locksmith 16th Centure Danner's Breaking Screw Tool

16th Century Locksmith Tool “Danner’s Breaking Screw” | Mr. Locksmith Blog

16th Century Locksmith Tool “Danner’s Breaking Screw” | Mr. Locksmith Blog

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Medieval Locksmith Tools.

Mr. Locksmith 16th Centure Danner's Breaking Screw Tool
16th Century Danner’s Breaking Screw LocksmithTool



Leonhard Danner of Nuremberg was a Sixteenth-Century Nuremberger engineer/inventor. Nuremberger (Nürnberg) was the leading metalworking centre of Europe.

Danner was renowned for inventing and manufacturing instruments which could demolish strong Medieval Moorish castle walls, gadgets for breaking through locks and metal bars as well as creating lifting machinery for heavy artillery. At the same time, he was also producing delicate artistic works.

The Danner screw device or “Dannscher Brechschrauber” which could destroy locks came from his workshop around 1560 and the operation of the vicelike tool was as simple as it was effective. The machine’s lawless efficiency and capacity to enable criminal behaviour was quickly recognized by the Nuremberg City Council and they issued a decree banning it from January 16, 1561. Anyone requesting such an apparatus should be reported to the reigning mayor and instructions for manufacturing them were restricted. This did not prevent more of these ‘Dannscher Brechschrauber’ being manufactured.

Medieval Locksmith Tools: 

“Die Brechschraube bestand aus zwei Haken, die unter die Schlossdecke geklemmt werden konnten, und einer Gewindestange, die es wirklich kinderleicht machte, das Schloss von der Tür zu reißen.”

“Danner’s breaking screw consisted of two hooks, which could be stuck undethe lock cover, and a thread bar, which made it really simple, to break the lock of the door.”

As a consequence of this invention, locksmiths developed far better and secure locks and other locksmiths, criminals, etc. invented methods to defeat these new locks.


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Les Cahiers de la Musee National de la Renaissance, Le Banc d’Orfevre de l’Electeur de Saxe, (Paris, 2012)
Herman Maué, et al.,(eds), Quasi Centrum Europae: Europa kauft in Nürnberg 1400–1800, (Nürnberg, 2002)
Watanabe-O’Kelly, Helen, Court Culture in Dresden: From Renaissance to Baroque, (Palgrave, Basingstoke, 2002)



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