Tensioning gear mechanism for tensioning a stored-energy spring of a spring-type stored-energy drive

A tensioning gear mechanism for tensioning a stored-energy spring of a spring-type stored-energy drive, the tensioning gear mechanism comprising:

• a tensioning wheel coupled to the stored-energy spring;
• an intermediate shaft coupled to said tensioning wheel;
• an intermediate wheel capable of being driven by a tensioning motor;
• a freewheel coupled to said intermediate wheel;
• a locking mechanism for separable locking of said tensioning wheel in a tensioned state of the stored-energy spring;
• a claw coupling having a first coupling jaw coupled to said intermediate shaft in a torsion-resistant manner, and a second coupling jaw connected to said freewheel;
• a synchronizer ring disposed between said first and second coupling jaws and coupled to said first coupling jaw in torsion-resistant manner;
• said first coupling jaw being displaceable, parallel to a longitudinal axis of said intermediate shaft, between a first end position, in which said first coupling jaw abuts said second coupling jaw and which it assumes in a course of the tensioning of the stored-energy spring, and a second end position, in which said first coupling jaw has been separated from said second coupling jaw and which it assumes in the tensioned state of the stored-energy spring;
• and
• said synchronizer ring is pressed against said second coupling jaw when said first coupling jaw is moving from the second end position into the first end position.