Filter cartridge and system using linear actuation

1. A filter cartridge comprising:

an outer shell having a first cartridge end and a second cartridge end, an inlet and an outlet located on the first cartridge end, and at least one cam track located on the outer shell;

the at least one cam track comprising a first opposing surface and a second opposing surface forming a channel having an entry portion and an exit portion;

the first opposing surface comprising a first upper advancing cam to advance an indexing lug through the channel and a locating detent to engage the indexing lug and to lock the filter cartridge in a service position, wherein the first upper advancing cam is located before the locating detent in the direction of travel from the entry portion to the exit portion;

the second opposing surface comprising a first advancing cam and a second advancing cam to advance the indexing lug through the channel, wherein the first advancing cam is positioned before an indexing stop and the second advancing cam is positioned after the indexing stop in a direction of travel from the entry portion to the exit portion; and

wherein the locating detent of the first opposing surface is positioned axially away from and after the indexing stop of the second opposing surface in the direction of travel from the entry portion to the exit portion.

2. The filter cartridge of claim 1 wherein the first opposing surface comprises a second upper advancing cam located after the locating detent in the direction of travel from the entry portion to the exit portion.

3. The filter cartridge of claim 1 comprising two cam tracks on the outer shell located 180 degrees apart; each cam track comprising the first opposing surface and the second opposing surface forming the channel having the entry portion and the exit portion; the first opposing surface comprising the locating detent; and the second opposing surface comprising the first advancing cam positioned before the indexing stop and the second advancing cam positioned after the indexing stop in the direction of travel from the entry portion to the exit portion.

4. The filter cartridge of claim 1 wherein the first advancing cam and the second advancing cam comprise linear ramps.

5. The filter cartridge of claim 1 wherein the second cartridge end comprises a cap having a rotatable connection to the second cartridge end.

6. The filter cartridge of claim 5 wherein the rotatable connection comprises a cam or a helix positioned between the cap and the second cartridge end.

7. The filter cartridge of claim 1 comprising a stem attached to the first cartridge end, and the stem is positioned in a manifold comprising a valve assembly and a coupling bracket.

8. The filter cartridge of claim 7 wherein the coupling bracket comprises a first end, a second end, and a sidewall; the second end of the coupling bracket comprising a receiving bore for the filter cartridge, the receiving bore having an interior surface, and the interior surface comprising at least one indexing lug.

9. The filter cartridge of claim 8 wherein the at least one indexing lug comprises a triangular shape, the locating detent comprises an angled portion adapted to receive a first corner of the indexing lug comprising a triangular shape, the indexing stop comprises an angled portion adapted to receive a second corner of the indexing lug comprising a triangular shape, and the first corner of the indexing lug is positioned axially away from the second corner of the indexing lug.

10. The filter cartridge of claim 9 wherein the interior surface comprises two indexing lugs having the triangular shape and the two indexing lugs are positioned 180 degrees apart.

11. A method of installing the filter cartridge of claim 7 into the manifold comprising pushing on the second cartridge end a first time, thereby rotating the filter cartridge in a first direction into a service position.

12. A method of removing the filter cartridge of claim 11 from the manifold comprising pushing on the second cartridge end a second time, thereby continuing to rotate the filter cartridge in the first direction to remove the filter cartridge from the service position.

13. A filter system comprising

a filter cartridge and a manifold;

the filter cartridge comprising an outer shell having a first cartridge end and a second cartridge end, and a stem attached to the first cartridge end;

the manifold comprising a valve assembly in fluid communication with the stem and a coupling block having a receiving bore with an interior surface, the receiving bore surrounding at least a portion of the outer shell;

an indexing lug located on either the interior surface or the outer shell and a cam track located on the outer shell or the interior surface engaged with the indexing lug; and

the cam track comprising a first opposing surface and a second opposing surface forming a channel having an entry portion and an exit portion; the first opposing surface comprising a first upper advancing cam to advance the indexing lug through the channel and a locating detent to engage the indexing lug and to lock the filter cartridge in a service position, wherein the first upper advancing cam is located before the locating detent in the direction of travel from the entry portion to the exit portion; the second opposing surface comprising a first advancing cam and a second advancing cam to advance the indexing lug through the channel, wherein the first advancing cam is positioned before an indexing stop and the second advancing cam is positioned after the indexing stop in a direction of travel from the entry portion to the exit portion; and wherein the locating detent of the first opposing surface is positioned axially away from and after the indexing stop of the second opposing surface in the direction of travel from the entry portion to the exit portion.

14. The filter system of claim 13 wherein the first opposing surface comprises a second upper advancing cam located after the locating detent in the direction of travel from the entry portion to the exit portion.

15. The filter system of claim 13 wherein the interior surface comprises the indexing lug and the outer shell comprises the cam track.

16. The filter system of claim 13 wherein the interior surface comprises the cam track and the outer shell comprises the indexing lug.

17. The filter system of claim 13 wherein the interior surface comprises the indexing lug and another cam track and the outer shell comprises the cam track and another indexing lug.

18. The filter system of claim 13 wherein the indexing lug comprises a triangular shape, the locating detent comprises an angled portion adapted to receive a first corner of the indexing lug comprising a triangular shape, the indexing stop comprises an angled portion adapted to receive a second corner of the indexing lug comprising a triangular shape, and the first corner of the indexing lug is positioned axially away from the second corner of the indexing lug.

19. A filter manifold that converts linear force into rotational motion to advance and secure a filter cartridge thereto comprising

a valve assembly;

a coupling block having a receiving bore with an interior surface; and

a cam track located on the interior surface;

the cam track comprising a first opposing surface and a second opposing surface forming a channel having an entry portion and an exit portion; the first opposing surface comprising a first upper advancing cam to advance an indexing lug through the channel and a locating detent to engage the indexing lug and to lock a filter cartridge in a service position, wherein the first upper advancing cam is located before the locating detent in the direction of travel from the entry portion to the exit portion; the second opposing surface comprising a first advancing cam and a second advancing cam to advance the indexing lug through the channel, wherein the first advancing cam is positioned before an indexing stop and the second advancing cam is positioned after the indexing stop in a direction of travel from the entry portion to the exit portion; and wherein the locating detent of the first opposing surface is positioned axially away from and after the indexing stop of the second opposing surface in the direction of travel from the entry portion to the exit portion.

20. A refrigerator comprising the filter manifold of claim 19 .

21. The refrigerator of claim 20 further comprising a filter cartridge.

22. The refrigerator of claim 21 wherein the filter cartridge comprises

an outer shell having a first cartridge end and a second cartridge end, at least a portion of the outer shell being receivable in the receiving bore;

a stem attached to the first cartridge end for fluid communication with the valve assembly; and

an indexing lug located on the outer shell for engaging with the cam track.

23. The filter system of claim 19 wherein the indexing lug comprises a triangular shape, the locating detent comprises an angled portion adapted to receive a first corner of the indexing lug having a triangular shape, the indexing stop comprises an angled portion adapted to receive a second corner of the indexing lug having a triangular shape, and the first corner of the indexing lug is positioned axially away from the second corner of the indexing lug.