Patent Document ID: 7935029
Application ID: 12322271
Patent Flag: 1

Claim One:
1. A swimmer training apparatus comprising: a housing; a rotatable spool mounted to the housing and defining a longitudinal spool axis, the rotatable spool having a cylindrical outer spool surface and being configured via rotating in a first direction or a second direction opposed to the first direction for respectively playing out or taking up a swimmer tethering line; a spooler mounted to the housing and adapted to axially advance a swimmer tethering line along the cylindrical outer spool surface during playing out or taking up the swimmer tethering line; a motor mounted within the housing and including a motor output shaft; and a torque transfer device coupled between the motor output shaft and the rotatable spool and including a magnetic field generator configured to generate a magnetic field, a first rotatable mechanism fixed to rotate with the motor output shaft and a second rotatable mechanism fixed to rotate with the rotatable spool, one of the first rotatable mechanism and the second rotatable mechanism including a magnetically permeable medium adapted, via interacting with a magnetic field generated by the magnetic field generator, to transfer a torque between the first rotatable mechanism and the second rotatable mechanism during rotating the rotatable spool.