Restraint devices

This disclosure discloses a restraint device including a pair of bracelets that are adjustable in distance therebetween, while at least one of the bracelets can be dually engaged during a restraint and dually disengaged not during the restraint. Further, this disclosure discloses a sleeve to enable a restraint device to be converted from a "chain style" into a "hinge style" and vice versa. Additionally, this disclosure discloses a restraint device including a first arm and a second arm, where the second arm is elastically coupled to the first arm in order to avoid overtightening when restraining. 本公开公开了一种约束装置，所述约束装置包括可在其间调节距离的一对手镯，而所述手镯中的至少一个能够在约束期间双重接合并且在不约束期间双重脱离。此外，本公开公开了使约束装置能够从"链式"转换成"铰链式"并且反之亦然的套筒。另外，本公开公开了一种约束装置，所述约束装置包括第一臂和第二臂，其中第二臂弹性地联接到第一臂，以便避免约束时的过紧。