Gymnastic wrist apparatus case for e.g. working on wrist muscles, has retaining ring partially adjusted on upper case and lower case elements, and having part projecting towards interior, where part is interlocked in circumferential groove

摘要

The case has upper case and lower case elements (10, 20) with two coupling edges on which two coupling units are formed, respectively. One of the coupling units cooperates with the other coupling unit for attaching the lower case element to the upper case element to define a circumferential groove between the coupling edges. A retaining ring (50) is partially adjusted on the upper case element and the lower case element, and has a part projecting towards interior, where the part is interlocked in the groove.