Feed-level controlled dispenser

1. A feed dispenser, comprising:

a housing; and

a piston assembly disposed within the housing, the piston assembly having:

a piston, the piston and the housing configured to translate relative to each other, and

a sheath disposed between the piston and an inner wall of the housing, the sheath defining a feed volume with the housing, the feed volume configured to receive feed from a housing chamber of the housing in response to the relative translation of the piston and the housing.

2. The feed dispenser of claim 1 , wherein the piston is configured to translate along a longitudinal axis between a first position and a second position relative to a base of the housing.

3. The feed dispenser of claim 2 , wherein the piston assembly comprises a spring disposed between the base of the housing and the piston, the spring configured to position the piston between the first position and the second position relative to the base of the housing, the sheath configured to extend about the piston and spring.

4. The feed dispenser of claim 3 , wherein the sheath comprises a first end secured to the base and a second end secured to the piston, the sheath configured to move between a compressed position and an extended position as the piston moves between the first position and the second position.

5. The feed dispenser of claim 3 , wherein the sheath is configured as a centering mechanism to substantially align a longitudinal axis of the spring with a longitudinal axis of the housing.

6. The feed dispenser of claim 5 , wherein the centering mechanism comprises an inner housing portion defining a chamber, the piston and spring disposed within the chamber, the chamber configured to substantially constrain lateral movement of the piston and the spring as the piston translates between the first position and the second position along the longitudinal axis.

7. The feed dispenser of claim 2 , comprising a locking mechanism coupled to the housing, the locking mechanism configured to move between a first position to secure the piston assembly in a compressed state relative to the base and a second position to release the piston assembly and allow the piston assembly to extend relative to the base.

8. The feed dispenser of claim 2 , comprising a centering mechanism configured to substantially align a longitudinal axis of the spring with a longitudinal axis of the housing.

9. The feed dispenser of claim 1 , wherein the housing is configured to translate along the longitudinal axis of the housing between a first position and a second position relative to the piston.

10. The feed dispenser of claim 9 , wherein the sheath comprises a first end secured to a base of the housing and a second end secured to the piston, the sheath configured to move between an extended position and a compressed position as the housing moves between the first position and the second position.

11. The feed dispenser of claim 1 , wherein the housing defines a set of feed ports in communication with at least one of the housing chamber and the feed volume.

12. A feed dispenser, comprising:

a housing; and

a piston assembly having:

a piston disposed within the housing,

a spring disposed between a base of the housing and the piston, the spring configured to position the piston along a longitudinal axis between a first position and a second position relative to the base, and

a sheath extending about the piston and spring, the sheath defining a feed volume with the housing, the feed volume configured to receive feed from a housing chamber of the housing in response to the piston moving between the first position and the second position.

13. The feed dispenser of claim 12 , wherein the sheath comprises a first end secured to the base and a second end secured to the piston, the sheath configured to move between a compressed position and an extended position as the piston assembly moves between the first position and the second position.

14. The feed dispenser of claim 12 , wherein the sheath is configured as a centering mechanism to substantially align a longitudinal axis of the spring with a longitudinal axis of the housing.

15. The feed dispenser of claim 14 , wherein the centering mechanism comprises an inner housing portion defining a chamber, the piston and spring disposed within the chamber, the chamber configured to substantially constrain lateral movement of the piston and the spring as the piston translates between the first position and the second position.

16. The feed dispenser of claim 12 , comprising a locking mechanism couple to the housing, the locking mechanism configured to move between a first position to secure the piston assembly in a compressed state relative to the base and a second position to release the piston assembly and allow the piston assembly to extend relative to the base.

17. The feed dispenser of claim 12 , comprising a centering mechanism coupled to the piston assembly, the centering mechanism configured to substantially align a longitudinal axis of the spring with a longitudinal axis of the housing.

18. A feed dispenser, comprising:

a housing configured to translate along a longitudinal axis of the housing between a first position and a second position; and

a piston assembly having:

a piston disposed within the housing, and

a sheath extending about the piston, the sheath defining a feed volume with the housing, the feed volume configured to receive feed from a housing chamber of the housing in response to the housing moving between the first position and the second position relative to the piston.

19. The feed dispenser of claim 18 , wherein the sheath comprises a first end secured to a base of the housing and a second end secured to the piston, the sheath configured to move between an extended position and a compressed position as the housing moves between the first position and the second position.