Displacement sifter
View Patent ↗A sifting apparatus and container for storing and dispensing material, such as cosmetic powder are described. Two sifters are arranged so their holes are not aligned, and a resilient material is placed between the sifters to create a gap that allows powder to pass out from a storage cavity to a surface accessible by the user. In a second configuration, at least one of the sifters is displaced toward the other sifter to reduce or eliminate the gap, thus reducing or preventing the flow of material through the sifters.
1. A container comprising:
a cover, and,
a bottom portion including:
a base,
a first sifter engaged with the base,
a second sifter engaged with first sifter such that a gap is present between at least a portion of the first sifter and at least a portion of the second sifter to permit material to pass through the first sifter, the second sifters, and the gap; and
a gasket adapted to maintain the gap between the portions of the first and second sifters when the cover is not engaged with the bottom portion,
wherein the cover is adapted to engage the bottom portion displacing the second sifter toward the first sifter to prevent material from passing through the first sifter, the second sifter, and the gap.
2. A container according to claim 1 , further comprising a spring to maintain the gap between the portions of the first and second sifters when the cover is not engaged with the bottom portion.
3. A container according to claim 1 , wherein the gasket elastically compresses or elastically deforms when the cover is engaged with the bottom portion.
4. A container according to claim 1 , wherein the gasket has a solid cross-section.
5. A container according to claim 1 , wherein the gasket contacts the first sifter between a first sifting hole disposed on the first sifter and a perimeter of the first sifter, and wherein the gasket further contacts the second sifter between a second sifting hole disposed on the second sifter and a perimeter of the second sifter.
6. A container according to claim 1 , further comprising an opening in the base for filling the base with the material to be dispensed and a cap for closing the opening.
7. A container according to claim 1 , wherein one or both of the sifters have a protrusion which occludes a hole in the opposing sifter when the second sifter is displaced.
8. A container according to claim 1 , wherein a sealing ring occludes a hole in the second sifter upon displacement.
9. A container according to claim 1 , further comprising:
the first sifter being threadedly engaged with the second sifter; and
the second sifter having a cog to allow engagement with the cap, whereby rotation of the cap rotates the second sifter thus altering the displacement between the first and second sifter.
10. A container according to 9 , wherein the pitch of the threads between the first and second sifter differs from the pitch of the threads securing the cap.
11. A container according to claim 1 , further comprising an opening in the base which accepts and engages a matching cartridge pre-filled with material to be dispensed.
12. A container according to claim 1 , further comprising a supporting member extending between the first sifter and the base.
13. An apparatus comprising:
a base holding material to be dispensed;
a first sifter having a sifting hole, the first sifter being engaged to the base;
a second sifter having a sifting hole, the second sifter engaged to the first sifter;
a gasket; and
a displacement mechanism to displace the second sifter toward the first sifter to prevent the flow of the material to the exterior surface of the second sifter when the displacement mechanism is placed into an engaged position, wherein the gasket maintains a gap between the first sifter and the second sifter when the displacement mechanism is placed into a disengaged position to allow material to flow through the sifting hole in the first sifter, the sifting hole in the second sifter, and the gap.
14. An apparatus according to claim 13 , wherein the gasket is co-molded to the first sifter or the second sifter.
15. An apparatus according to claim 13 , wherein the gasket is arranged between the first and second sifters, is located proximate to an outer edge of the first and second sifters.
16. An apparatus according to claim 13 , further comprising an opening in the base and a cap to seal the opening.
17. An apparatus according to claim 13 , further comprising a protrusion on at least one of the sifters, the protrusion to occlude the hole in the opposing sifter when the second sifter is displaced toward the first sifter.
18. An apparatus according to claim 13 , further comprising the second sifter having a first side facing the first sifter and a second side opposite the first side, the second side including a concave surface.
19. An apparatus according to claim 13 , wherein the first sifter is integral to the base.
20. A sifting apparatus comprising:
a first sifter,
a second sifter engaged with the first sifter such that a gap is present between a portion of the first sifter and a portion of the second sifter to permit material to pass through the first sifter, the second sifter, and the gap;
a displacement mechanism operable to displace the second sifter toward the first sifter to prevent the flow of the material through the first sifter, the second sifter, and the gap, and,
a gasket adapted to maintain the gap between the portions of the first and second sifters.
21. A sifting apparatus according to claim 20 , wherein one or both of the sifters have a protrusion which occludes a hole in the opposing sifter when the second sifter is displaced toward the first sifter.
22. A container according to claim 1 , wherein the gasket has a hollow cross-section.
23. A container according to claim 1 , wherein the gasket is substantially U-shaped in cross-section.
24. A container according to claim 1 , wherein the gasket has a cross section of which at least a portion of the cross-section is substantially sinusoidal or zigzagged.