US 7,350,419 B2
	Control device for non-positive connections
Holger Lüthje, Halstenbek (Germany); Saskia Biehl, Wendeburg (Germany); and Ralf Bandorf, Braunschweig (Germany)
Assigned to Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung E.V., Munich (Germany)
Appl. No. 10/511,252 PCT Filed Apr. 10, 2003, PCT No. PCT/EP03/03750 § 371(c)(1), (2), (4) Date Feb. 24, 2005, PCT Pub. No. WO03/087751, PCT Pub. Date Oct. 23, 2003.
Claims priority of application No. 102 17 284 (DE), filed on Apr. 12, 2002.
Prior Publication US 2006/0051180 A1, Mar. 09, 2006
Int. Cl. F16B 31/02 (2006.01)

U.S. Cl. 73—761

16 Claims

1. A control device for non-positive connections, in particular screw connections, wherein the device possesses force-application elements and at least one measuring element, wherein the measuring element is provided at least in some areas with a layer exhibiting a force sensory effect, characterized in that the force sensory layer changes its electrical resistance due to changes of an applied force and the surface of the layer has as support profiles flat prominences constructed for recording a force applied by the force application elements characterized in that the force sensory layer comprises diamond-like carbon-based layers including at least one of an amorphous and nanocrystalline structure.