Locking collar for exercise bar with dynamically rotating hand grips

An exercise bar assembly comprising:

• a pair of hand grip assemblies, each including a planar frame rotatably supporting a hand grip to be manually engaged by a user;
• a pair of plate bar assemblies, one each engaged to one side of said frame of a corresponding one of said pair of hand grip assemblies, each of said plate bar assemblies configured to support a weight;
• and
• a center bar assembly having opposite ends, each of said opposite ends removably engaged to a corresponding one of said pair of plate bar assemblies on an opposite side of said frame opposite a corresponding one of said pair of hand grip assemblies, said center bar assembly including;
• an elongated center bar including a tubular portion at each end thereof, each tubular portion defining an interior cavity open at a corresponding one of said opposite ends of said center bar assembly, and
• at each end of said elongated center bar;
• a cylindrical collar engaged to said tubular portion;
• an elongated sleeve having an annular end wall and an opposite end engaged to said collar and defining an interior between said end wall and said opposite end;
• and
• a retaining washer disposed within said interior of said elongated sleeve, said retaining washer including an annular ring defining at the inner circumference at least one radial recess and at least one radial projection circumferentially adjacent said recess;
• and
• a mounting element fastened to said opposite side of said frame, said mounting element including;
• a flange fastened to said frame;
• an orientation stud projecting from said flange and including;
• an end configured to be received within the interior cavity of said center bar;
• and
• at least one shoulder projecting radially outward from said orientation stud, said at least one shoulder sized for passage through said retaining washer only when said at least one recess is circumferentially aligned with said at least one shoulder, said at least one shoulder axially offset from said flange to define a corresponding circumferential channel between said at least one shoulder and said flange sized to receive said retaining washer therein,
• wherein said washer is rotatable relative to said orientation stud to selectively align said at least one recess with said at least one shoulder and is axially movable along said orientation stud so that said washer can be moved toward said flange and then rotated into the circumferential channel corresponding to said at least one shoulder.