Electric locking structure for resistance motor of exercise machine

1 . An electric locking structure for a resistance motor of an exercise machine, the exercise machine including: a frame, at least one resistance motor, a traction member, an electric control unit, and a power storage unit, the at least one resistance motor being fixed to the frame and having an output shaft for outputting a resistance force, and the electric locking structure for each of the at least one resistance motor, comprising:

a rotary disk connected to the output shaft, wherein the traction member is coiled on the rotary disk for pulling of the rotary disk by a user of the exercise machine to overcome the resistance force output by the output shaft;

a locking disk connected to the output shaft and being formed with a plurality of locking spaces, wherein each of the plurality of locking spaces is an axial through hole extending parallel with respect to the output shaft; and

a locking bolt movably disposed on the frame;

wherein the electric control unit is connected to the locking bolt associated with the at least one resistance motor;

wherein the power storage unit is electrically connected to the electric control unit; and

wherein when the at least one resistance motor is stationary, the electric control unit selectively moves the locking bolt associated with the at least one resistance motor to extend into or be out of one of the plurality of locking spaces of the locking disk for either of restricting or releasing the output shaft to either one of lock or unlock the at least one resistance motor, thereby said locking bolt extending into a selective one of the plurality of locking spaces of the locking disk positively locks the locking disk.

2 . The electric locking structure as claimed in claim 1 , wherein the electric control unit is either one of a control motor or a solenoid valve.

3 . The electric locking structure as claimed in claim 2 , wherein the electric control unit includes an axle, a control disk fixed to the axle, and a cable extending between the control disk and the locking bolt associated with the at least one resistance motor, wherein the control disk is connected to the locking bolt associated with the at least one resistance motor through the cable for moving the locking bolt associated with the at least one resistance motor to extend into or be out of a selective one of the plurality of locking spaces of the locking disk.

4 . The electric locking structure as claimed in claim 3 , wherein the locking bolt associated with the at least one resistance motor is disposed in a retaining seat and the retaining seat is fixed to the frame, and wherein a stop ring is fitted on an outer periphery of the locking bolt associated with the at least one resistance motor and a return spring is disposed on said locking bolt for being held against a surface of the stop ring facing away from the locking disk, and thereby the return spring being elastically held between the stop ring and an inner wall of the retaining seat.

5 . The electric locking structure as claimed in claim 4 , further comprising two resistance motors, and wherein the cable includes a first cable and two second cables, wherein one of two ends of the first cable is connected to the control disk and one end of each of the two second cables is connected to an end of the locking bolt associated with a corresponding one of the at least one resistance motor of the two resistance motors facing away from the locking disk, and another end of each of the two second cables and a corresponding one of the two ends of the first cable are connected in opposing relationship to a linking block.

6 . The electric locking structure as claimed in claim 1 , wherein the locking bolt associated with the at least one resistance motor extends parallel with respect to the output shaft.

7 . The electric locking structure as claimed in claim 1 , wherein the locking disk is either one of independently coupled to the rotary disk or is integrally formed with the rotary disk.

8 . The electric locking structure as claimed in claim 1 , wherein the plurality of locking spaces are arranged on the locking disk around the output shaft.

9 . The electric locking structure as claimed in claim 1 , wherein the traction member is either one of a pull cable, a webbing, or a pull rope.

10 . An electric locking structure for a resistance motor of an exercise machine, the exercise machine including a frame, at least one resistance motor, a traction member, an electric control unit, and a power storage unit, the at least one resistance motor being fixed to the frame and having an output shaft for outputting a resistance force, and the electric locking structure for each of the at least one resistance motor, comprising:

a rotary disk connected to the output shaft, wherein the traction member is coiled on the rotary disk for pulling of the rotary disk by a user of the exercise machine to overcome the resistance force output by the output shaft;

a locking disk connected to the output shaft and being formed with a plurality of locking spaces; and

a locking bolt movably disposed on the frame;

wherein the electric control unit is connected to the locking bolt associated with the at least one resistance motor and the electric control unit is either one of a control motor or a solenoid valve, the electric control unit including an axle, a control disk fixed to the axle, and a cable extending between the control disk and the locking bolt associated with the at least one resistance motor, wherein the control disk is connected to the locking bolt associated with the at least one resistance motor through the cable;

wherein the power storage unit is electrically connected to the electric control unit; and

wherein when the at least one resistance motor is stationary and through the connection between the control disk and the locking bolt associated with the at least one resistance motor via the cable, the electric control unit moves the locking bolt associated with the at least one resistance motor to extend into or be out of a selective one of the plurality of locking spaces of the locking disk for either of restricting or releasing the output shaft to either one of lock or unlock the at least one resistance motor.

11 . The electric locking structure as claimed in claim 10 , wherein the locking bolt associated with the at least one resistance motor is disposed in a retaining seat and the retaining seat is fixed to the frame, and wherein a stop ring is fitted on an outer periphery of the locking bolt associated with the at least one resistance motor and a return spring is disposed on said locking bolt for being held against a surface of the stop ring facing away from the locking disk, and thereby the return spring being elastically held between the stop ring and an inner wall of the retaining seat.

12 . The electric locking structure as claimed in claim 11 , further comprising two resistance motors, and wherein the cable includes a first cable and two second cables, wherein one of two ends of the first cable is connected to the control disk and one end of each of the two second cables is connected to an end of the locking bolt associated with a corresponding one of the at least one resistance motor of the two resistance motors facing away from the locking disk, and another end of each of the two second cables and a corresponding one of the two ends of the first cable are connected in opposing relationship to a linking block.

13 . The electric locking structure as claimed in claim 10 , wherein the locking bolt associated with the at least one resistance motor extends parallel with respect to the output shaft.

14 . The electric locking structure as claimed in claim 10 , wherein the locking disk is either one of independently coupled to the rotary disk or is integrally formed with the rotary disk.

15 . The electric locking structure as claimed in claim 10 , wherein each of the plurality of locking spaces is either an axial through hole or is a groove formed at a corresponding circumferential portion of the locking disk.

16 . The electric locking structure as claimed in claim 10 , wherein the plurality of locking spaces are arranged on the locking disk around the output shaft.

17 . The electric locking structure as claimed in claim 10 , wherein the traction member is either one of a pull cable, a webbing, or a pull rope.