Resistance training exercise machines having inertial switch-actuated dampening device

1. An exercise machine comprising:

a resistance mechanism that is movable with respect to a stationary frame into and between a rest position and an active position;

a pulley system coupled to the resistance mechanism and being operable by a user performing an exercise motion, wherein operation of the pulley system moves the resistance mechanism from the rest position to the active position, against a resistance force from the resistance mechanism, and wherein releasing the pulley system allows the resistance force to automatically move the resistance mechanism back towards the rest position;

a dampening device comprising an inertial switch that causes the dampening device to automatically dampen movement of the resistance mechanism from the active position towards the rest position when the pulley system is suddenly released;

wherein the pulley system comprises a pulley cable and a cam about which the pulley cable extends such that operation of the pulley system causes rotation of the cam, and such that when the user suddenly releases the pulley system the cam is rotated by the pulley cable;

wherein the inertial switch is coupled to the cam such that rotation of the cam causes rotation of the inertial switch; and

a hub that rotates along with the cam, wherein the inertial switch is located on an outer perimeter of the hub;

wherein the inertial switch further comprises a pawl that is movable into and between an engagement position in which the dampening device engages with the pulley system and a disengaged position in which the dampening device is disengaged from the pulley system; and wherein the inertial switch further comprises a spring providing a spring force that biases the pawl into the disengaged position, wherein suddenly releasing the pulley system when the resistance mechanism is in the active position causes an inertial force on the inertial switch sufficient to move the pawl into the engagement position against the spring force; and

wherein the dampening device further comprises a damper plate that is coupled to the dampening device, wherein in the engagement position the pawl engages with the damper plate so that the hub and damper plate rotate together and in the disengaged position the pawl is disengaged from the damper plate so that the hub rotates with respect to the damper plate.

2. The exercise machine according to claim 1 , further comprising a dampening member that is coupled to the damper plate.

3. The exercise machine according to claim 2 , wherein the dampening member comprises a piston-cylinder device that slows the movement of the resistance mechanism from the active position towards the rest position when the pawl engages with the damper plate.

4. The exercise machine according to claim 3 , wherein the piston-cylinder device has a first end that is coupled to the stationary frame and an opposite second end that is coupled to the damper plate such that rotation of the damper plate in a first direction causes the piston-cylinder to extend and such that rotation of the damper plate in an opposite, second direction causes the piston-cylinder to retract.

5. The exercise machine according to claim 4 , wherein when the spring force biases the pawl into the disengaged position, the piston-cylinder device is configured to automatically retract and rotate the damper plate back toward an original position of the damper plate.

6. The exercise machine according to claim 1 , wherein the damper plate is concentrically aligned with the hub.

7. The exercise machine according to claim 6 , wherein the damper plate comprises an engagement finger that extends radially inwardly towards the hub and is engaged by the pawl when the pawl is in the engagement position and the hub is rotated with respect to the damper plate.

8. An exercise machine comprising:

a resistance mechanism that is movable with respect to a stationary frame into and between a rest position and an active position;

a pulley system coupled to the resistance mechanism and being operable by a user performing an exercise motion, wherein operation of the pulley system moves the resistance mechanism from the rest position to the active position, against a resistance force from the resistance mechanism, and wherein releasing the pulley system allows the resistance force to automatically move the resistance mechanism back towards the rest position; and

a dampening device configured to automatically slow movement of the resistance mechanism from the active position to towards the rest position when the pulley system is released; wherein the dampening device comprises a piston-cylinder device and an inertial switch, the dampening device being configured to automatically slow the movement of the resistance mechanism from the active position towards the rest position depending upon a positional state of the inertial switch;

wherein the inertial switch comprises a pawl that is movable into and between an engagement position in which the piston-cylinder device slows the movement of the resistance mechanism and a disengaged position in which the piston-cylinder device does not slow the movement of the resistance mechanism.

9. The exercise machine according to claim 8 , wherein the inertial switch further comprises a spring providing a spring force that biases the pawl into the disengaged position, and wherein suddenly releasing the pulley system when the resistance mechanism is in the active position causes an inertial force on the inertial switch sufficient to move the pawl into the engagement position, against the spring force.

10. The exercise machine according to claim 9 , wherein the pulley system comprises a pulley cable and a cam about which the pulley cable extends such that operation of the pulley system causes rotation of the cam, and such that suddenly releasing the pulley system rotates the cam; wherein the inertial switch is coupled to the cam such that rotation of the cam causes rotation of the inertial switch.

11. The exercise machine according to claim 8 , wherein the pulley system comprises a pulley cable and a cam about which the pulley cable extends such that operation of the pulley system causes rotation of the cam, and such that when the user suddenly releases the pulley system the cam is rotated by the pulley cable; and wherein the inertial switch is coupled to the cam such that rotation of the cam causes rotation of the inertial switch.

12. The exercise machine according to claim 11 , further comprising a hub that rotates along with the cam, wherein the inertial switch is located on an outer perimeter of the hub.

13. The exercise machine according to claim 8 , wherein the resistance mechanism comprises a plurality of elastic resistance members that are supported by a carriage.

14. An exercise machine comprising:

a resistance mechanism that is movable with respect to a stationary frame into and between a rest position and an active position, the resistance mechanism comprising a plurality of elastic resistance members that are supported by a carriage;

a pulley system coupled to the resistance mechanism and being operable by a user performing an exercise motion, wherein operation of the pulley system moves the resistance mechanism from the rest position to the active position, against a resistance force from the resistance mechanism, and wherein releasing the pulley system allows the resistance force to automatically move the resistance mechanism back towards the rest position; and

a dampening device comprising an inertial switch that causes the dampening device to automatically dampen movement of the resistance mechanism from the active position towards the rest position when the user suddenly releases the pulley system, wherein the dampening device further comprises a piston-cylinder device that slows the movement of the resistance mechanism from the active position towards the rest position depending upon a positional state of the inertial switch;

wherein the pulley system comprises a pulley cable and a cam about which the pulley cable extends such that operation of the pulley system causes rotation of the cam, and such that when the user suddenly releases the pulley system the cam is rotated by the pulley cable; and

wherein the inertial switch is coupled to the cam such that rotation of the cam causes rotation of the inertial switch.

15. The exercise machine according to claim 14 , further comprising a hub that rotates along with the cam, wherein the inertial switch is located on an outer perimeter of the hub, and wherein the inertial switch comprises a pawl that is movable into and between an engagement position in which the dampening device engages with the pulley system and a disengaged position in which the dampening device is disengaged from the pulley system.

16. An exercise machine comprising:

a resistance mechanism that is movable with respect to a stationary frame into and between a rest position and an active position;

a pulley system coupled to the resistance mechanism and being operable by a user performing an exercise motion, wherein operation of the pulley system moves the resistance mechanism from the rest position to the active position, against a resistance force from the resistance mechanism, and wherein releasing the pulley system allows the resistance force to automatically move the resistance mechanism back towards the rest position;

a dampening device comprising an inertial switch that causes the dampening device to automatically dampen movement of the resistance mechanism from the active position towards the rest position when the pulley system is suddenly released;

wherein the pulley system comprises a pulley cable and a cam about which the pulley cable extends such that operation of the pulley system causes rotation of the cam, and such that when the user suddenly releases the pulley system the cam is rotated by the pulley cable;

wherein the inertial switch is coupled to the cam such that rotation of the cam causes rotation of the inertial switch; and

a hub that rotates along with the cam, wherein the inertial switch is located on an outer perimeter of the hub;

wherein the inertial switch further comprises a pawl that is movable into and between an engagement position in which the dampening device engages with the pulley system and a disengaged position in which the dampening device is disengaged from the pulley system; and

wherein in the engagement position, the pawl extends out of a recess in the hub and wherein in the disengaged position the pawl is retracted in the recess.