Patent ID: 11938366
Assignee: nan
Field: Furniture, games (Other fields)
Classification: CPC A | IPC A

Claim 4:
5. The free weight training protection device of claim 3, wherein if the barbell displacement data indicates a downward movement and a speed is greater than a safety value, the controller will start the protection program;
wherein, if the position data of the two plate-collars is lower than the ready position and the position of the two plate-collars has not changed within a first certain time, the controller will start the protection program;
wherein, if the barbell displacement data indicates an upward movement and the position data of the two plate-collars has not reached the ready position within a second certain time, the controller will start the protection program;
wherein, if the position data of the two plate-collars is lower than the lowest position, the controller will start the protection program; and
wherein, if a difference between the position data of the two plate-collars exceeds an allowable value, then the controller will start the protection program.