Patent ID: 8118334

Claim:
An adjusting device for rotating bolts of closures for mounting in a thin-wall door leaf and a door frame, comprising: a closure driveshaft which is provided with an external thread; a bolt which is axially adjustable along the driveshaft; a coupling disk which couples the bolt and the driveshaft, the coupling disk being axially adjustable along the driveshaft and being rigid against rotation with respect to the driveshaft; and a holding device which presses the coupling disk against the bolt; wherein said bolt is a rotatable bolt which has a mating internal thread for screwing in the closure driveshaft; wherein the driveshaft has an axially extending groove that fits a projection part of the coupling disk to prevent the coupling disk from rotating; wherein the bolt has a projection or recession that fits an engagement part of the coupling disk; wherein the driveshaft has a noncircular cross section including a flattened portion; wherein the holding device is formed by a spiral spring which is slid onto the driveshaft; and wherein the coupling disk which contacts the spring has a projecting rim.