Abstract: On a training device, in particular for developing human muscles, having a torque-generating unit which comprises an electric motor and a reduction gearing, and whose output interacts with at least one training element offered to the exercising person, an electric motor is designed as a three phase AC motor. Associated with the latter is a frequency converter for adjusting the frequency and amperage of the three phase current supplied to the electric motor. A control unit is provided upstream of the frequency converter. An angle-of-rotation sensor is associated with the motor whose measured signal is supplied to both the frequency converter and the control unit. The frequency converter is fed by the control unit with a setpoint value of the torque to be generated by the motor which setpoint value receives the measured signal from the angle-of-rotation sensor. The frequency converter adjusts the frequency and the amperage of the motor current using the principle of field-oriented control.

Abstract: On a training device, in particular for developing human muscles, having a torque-generating unit which comprises an electric motor and a reduction gearing, and whose output interacts with at least one training element offered to the exercising person, an electric motor is designed as a three phase AC motor. Associated with the latter is a frequency converter for adjusting the frequency and amperage of the three phase current supplied to the electric motor. A control unit is provided upstream of the frequency converter. An angle-of-rotation sensor is associated with the motor whose measured signal is supplied to both the frequency converter and the control unit. The frequency converter is fed by the control unit with a setpoint value of the torque to be generated by the motor which setpoint value receives the measured signal from the angle-of-rotation sensor. The frequency converter adjusts the frequency and the amperage of the motor current using the principle of field-oriented control.

Abstract: The seat (10) of a training device is connected via parallelogram arms (6a, 6b) to a base frame (2) so that it can execute circular-segment movements in reference to the base frame. A training force transmission frame (26) is articulated to a parallelogram arm, and one end is mounted to a crank mechanism (22) that acts on a belt pulley (24) which is connected via a belt (24) to a flywheel (38). A brake (40) (against which the trainee works) acts on the flywheel. A grip holder (30) with handgrips (32) extends upward from the transmission frame (26) before the seat. Footrests (18) are also provided on the base frame (2). The relative movements between the seat (10), the transmission frame (26) that executes a combined lengthwise and swinging motion, and the base frame (2) allow force to be exerted from the seat via the hand grips to the transmission frame to exercise the arms and upper body.

Abstract: An exercising apparatus for use by skiers to practice downhill runs, slalom runs and analogous types of runs has a main frame supporting a swaying frame which is turnable with reference to the main frame about two parallel horizontal axes extending longitudinally of the main frame. The movements of the swaying frame to either side of a central longitudinal vertical symmetry plane are opposed by strong coil springs whose bias is adjustable by a feed screw. The swaying frame carries a seesaw frame which is rockable with reference thereto about one or more horizontal axes disposed in the central longitudinal symmetry plane of the swaying frame.

Abstract: In a ball throwing machine, especially for squash balls or tennis balls, there is located on the base of a ball storage container a ball separating device in the form of a driven turntable which is arranged so as to be rotatable in a substantially horizontal plane and has on a circumferential circle substantially vertical passages of a width somewhat greater than the diameter of the balls to be separated. The turntable has a thickness corresponding to a multiple of a ball diameter and at the ball delivery point it has a ball stop which is located at a distance equivalent to approximately one ball diameter above the base member and there at least partially blocks the passages and for that purpose extends into a peripheral groove of the turntable. Each passage is located above a discrete base member which is connected to the turntable and rotates together with the turntable and gives way selectively below each passage in the peripheral sector of the ball discharge opening.