Tensioning systems and methods

1. A tensioning apparatus comprising:

a housing;

a fastener extending through an entirety of the housing

a trolley adjustably positioned within the housing about the fastener; and

a pulley disposed outside the housing and coupled to the trolley, wherein the pulley moves in unison with the trolley along an opening in the housing;

wherein the trolley and the pulley move in unison along the opening in the housing in response to adjustment of the fastener;

a plate disposed about the fastener inside the trolley; and

a spring disposed about the fastener between the plate and an interior surface of the trolley.

2. The tensioning apparatus of claim 1 , wherein the spring compresses between the plate and the interior surface in response to force applied to the fastener in a tightening direction.

3. The tensioning apparatus of claim 2 , wherein, when the spring is compressed, the spring preserves a position of the trolley and the pulley against movement in a direction opposite a direction of compression.

4. The tensioning apparatus of claim 3 , wherein the spring preserves the position of the trolley and the pulley against downward movement.

5. The tensioning apparatus of claim 1 , wherein the opening comprises a slide that extends substantially parallel to the fastener.

6. The tensioning apparatus of claim 1 , wherein the fastener comprises a threaded member that extends through an entirety of the housing.

7. The tensioning apparatus of claim 1 , comprising a belt disposed along the pulley, wherein the pulley supplies tension for the belt.

8. A method of tensioning, comprising:

positioning a trolley within a housing about a fastener that extend through an entirety of the housing;

positioning a trolley within a housing about a fastener;

coupling a pulley to the trolley, wherein the pulley is disposed outside the housing;

adjusting the fastener, the pulley moving in unison with the trolley along an opening in the housing in response to the adjusting; and

wherein a spring and a plate are each disposed about the fastener inside the trolley.

9. The method of claim 8 , wherein the adjusting comprises applying force to the fastener in a tightening direction, the spring compressing between the plate and an interior surface of the trolley in response to the force in the tightening direction.

10. The method of claim 9 , wherein the compressed spring preserves a position of the trolley and the pulley against movement in a direction opposite a direction of compression.

11. The method of claim 9 , comprising applying force to the fastener in a loosening direction, the spring decompressing in response to the force in the loosening direction.

12. The method of claim 9 , wherein the applying force to the fastener in the tightening direction comprises supplying increased tension for a belt disposed along the pulley.

13. A tensioning system, comprising:

a housing;

a fastener extending through an entirety of the housing;

a trolley adjustably positioned within the housing about the fastener;

a tensioning pulley disposed outside the housing and coupled to the trolley, wherein the tensioning pulley moves in unison with the trolley along an opening in the housing;

a motor comprising a motor pulley coupled thereto;

a motor-driven system comprising a drive pulley coupled thereto;

a belt linking the motor pulley and the drive pulley, wherein the tensioning pulley engages the belt at a point between the motor pulley and the drive pulley and supplies tension for the belt; and

wherein the motor-driven system comprises a blower for a heating, ventilation, and air conditioning (HVAC) system.

14. The tensioning system of claim 13 , wherein the trolley and the tensioning pulley move in unison along the opening in the housing in response to adjustment of the fastener.

15. The tensioning system of claim 13 , comprising:

a plate disposed about the fastener inside the trolley; and

a spring disposed about the fastener between the plate and an interior surface of the trolley, wherein the spring compresses between the plate and the interior surface in response to force applied to the fastener in a tightening direction.

16. The tensioning system of claim 15 , wherein, when the spring is compressed, the spring preserves a position of the trolley and the tensioning pulley against movement in a direction opposite a direction of compression.