Cleaning apparatus

• US 4,643,748 A
• Filed: 02/24/1986
• Issued: 02/17/1987
• Est. Priority Date: 02/24/1986
• Status: Expired due to Term

• Current Assignee: Dyson Technology Limited (Beeswax Holdings UK Limited)
• Original Assignee: Notetry Limited
• Inventors: Dyson, James
• Primary Examiner(s): Nozick, Bernard
• Application Number:
  US06/832,370
• Time in Patent Office: 358 Days
• Field of Search: 55/338, 55/345, 55/392, 55/417, 55/429, 55/459 R, 209/144, 209/211
• US Class Current: 55/338
• CPC Class Codes: A47L 9/1633 Concentric cyclones
• CPC Class Codes: B01D 45/12 by centrifugal forces centrifuges B04B; cyclones B04C
• CPC Class Codes: B04C 5/00 Apparatus in which the axial direction of the vortex is reversed combined with other devices B04C9/00
• CPC Class Codes: B04C 5/26 for series flow

Abstract

An improved cleaning apparatus 10 is described wherein a shroud 21 with a moveable collar 22 is provided on the outside surface 12b of a cyclone 12 in an air outlet 13d from a container 11 leading to the cyclone 12 to dislodge accumulated dirt in the air outlet when a fan 18 drawing air through the apparatus is stopped. The apparatus preferably has a disc 20 which prevents long strands, such as hair, in the dirt from clogging the air outlet 13d from the container 11. The apparatus is preferably in the form of a vacuum cleaner.

Claims

1. In a cleaning apparatus including an outer container comprising a bottom and a sidewall extending to and meeting the bottom, the sidewall having an interior surface, a dirty air inlet at an upper portion of the outer container spaced from the bottom which is oriented for supplying dirt laden air into the container tangentially to the interior surface of the outer container which has a circular cross-section and an air outlet from the container at the upper portion of the container;

a circular cross-sectioned cyclone having a longitudinal axis and mounted inside the container, the cyclone comprising a cyclone air inlet at an upper end having a first diameter of the cyclone in air communication with the air outlet of the container, an interior dirt rotational surface of frusto-conical shape for receiving an air flow from the air inlet and for maintaining its velocity to a cone opening smaller in diameter than the diameter of the upper end of the cyclone, the air inlet being oriented for supplying air tangentially to the surface, an outer surface of frusto-conical shape, and a cyclone air outlet communicating with the interior of the cyclone adjacent the upper end of the cyclone;

a dirt receiving and collecting chamber extending from the cone opening; and

means for generating an air flow which passes sequentially through the dirty air inlet, the container, the cyclone air inlet, the cyclone, the receiving chamber and the cyclone air outlet, the air flow rotating around the frusto-conical interior surface of the cyclone and depositing the dirt in the receiving chamber the improvement which comprises;

(a) shroud means which provides an extension of the air outlet from the container mounted around the outer surface of the cyclone, the shroud means having a circular cross-section around the longitudinal axis of the cyclone and extending from the air outlet towards the bottom of the container; and

(b) collar means moveably mounted on the shroud means around the outer surface of the cyclone so as to be moveable parallel to the longitudinal axis of the cyclone into the shroud means when the air flow is generated and out of the shroud means when the air flow is stopped to thereby prevent dirt from being entrapped in the air outlet.

2. The apparatus of claim 1 wherein the collar means has a larger end projecting from the shroud means towards the bottom of the container with a rim on a smaller end opposite the larger end which rests on a lip of the shroud means when the air flow is stopped.

3. The apparatus of claim 2 wherein the collar means has a cross-section positioned along the longitudinal axis in the form of a right triangle with the hypotenuse adjacent to and parallel to the outer surface of the cyclone, a short side at the larger end of the collar means perpendicular to the longitudinal axis and a long side parallel to the longitudinal axis and wherein the rim is positioned on the collar means adjacent the intersection of the long side and the hypotenuse at the smaller end of the collar means.

4. The apparatus of claim 3 wherein the collar means has an angle of between about 9°

and 11°

between the long side and the hypotenuse.

5. The apparatus of claim 1 wherein a portion of the shroud means is removable so that the collar means can be separated from the shroud.

6. The apparatus of claim 1 wherein a stop means is provided on the outer surface cyclone to restrict the movement of the collar means into the shroud when the air flow is generated in the apparatus.

7. The apparatus of claim 6 wherein the stop means is engaged by the rim on the collar means.

8. The apparatus of claim 1 wherein a disc means is attached on the outside of the cyclone around the longitudinal axis and intermediate the shroud means and dirt receiving and collecting chamber with a space between the interior surface of the container and the disc means wherein the disc means retards long strands in the dirt from clogging the air outlet and retains the strands in the container.

9. The apparatus of claim 1 wherein the collar means has a larger end projecting from the shroud means towards the bottom of the container with a rim or a smaller end opposite the larger end which rests on a lip of the shroud means when the air flow is stopped and wherein a disc means is provided on the outside of the cyclone around the longitudinal axis and intermediate the shroud means and dirt receiving and collecting chamber with a space between the interior surface of the container and the disc means wherein the disc means retards long strands in the dirt from clogging the air outlet and retains the strands in the container.

10. The apparatus of claim 9 wherein the collar means has a cross-section positioned along the longitudinal axis in the form of a right triangle with the hypotenuse adjacent to and parallel to the outer surface of the cyclone, a short side at the larger end of the collar means perpendicular to the longitudinal axis and a long side parallel to the longitudinal axis and the rim is positioned on the collar means adjacent the intersection of the long side and the hypotenuse at the smaller end of the collar means which rests on the lip of the shroud means when the air flow is stopped.

11. The apparatus of claim 10 wherein the collar means has an angle of between about 9°

and 11°

between the long side and the hypotenuse.

12. The apparatus of claim 9 wherein a stop means is provided on the outer surface of the cyclone to restrict the movement of the collar means into the shroud means when the air flow is generated in the apparatus.

13. The apparatus of claim 12 wherein the stop means is engaged by the rim on the collar means.

14. The apparatus of claim 13 wherein the stop means is provided by projections from the outer surface of and around the longitudinal axis of the cyclone.

15. In a cleaning apparatus including an outer container comprising a bottom and a sidewall extending to and meeting the bottom, the sidewall having an interior surface, a dirty air inlet at an upper portion of the outer container spaced from the bottom which is oriented for supplying dirt laden air into the container tangentially to the interior surface of the outer container which has a circular cross-section and an air outlet from the container at the upper portion of the container;

a circular cross-sectioned cyclone having a longitudinal axis and mounted inside the container, the cyclone comprising a cyclone air inlet at an upper end having a first diameter of the cyclone in air communication with the air outlet of the container, an interior dirt rotational surface of frusto-conical shape for receiving an air flow from the air inlet and for maintaining its velocity to a cone opening smaller in diameter than the diameter of the upper end of the cyclone, the air inlet being oriented for supplying air tangentially to the surface, an outer surface of frusto-conical shape, and a cyclone air outlet communicating with the interior of the cyclone adjacent the upper end of the cyclone;

a dirt receiving and collecting chamber extending from the cone opening; and

means for generating an air flow which passes sequentially through the dirty air inlet, the container, the cyclone air inlet, the cyclone, the receiving chamber and the cyclone air outlet, the air flow rotating around the frusto-conical interior surface of the cyclone and depositing the dirt in the receiving chamber the improvement which comprises;

a disc means provided on the outside of the cyclone intermediate the receiving chamber and the air outlet of the container and around to the longitudinal axis of the cyclone with a space between the interior surface of the container and the disc means for passage of air wherein the disc means retards long strands in the dirt from clogging the air outlet and retains the strands in the container.

16. The apparatus of claim 15 wherein the disc means is circular around the longitudinal axis of the cyclone.

17. The apparatus of claim 16 wherein the disc means is conical in shape around the longitudinal axis with a smaller opening attached to the outer surface of the cyclone and a larger opening below the smaller opening facing the bottom of the container such that there is a tapered wall between the openings.

18. The apparatus of claim 17 wherein the larger opening has a flange perpendicular to the longitudinal axis of the container between the larger opening of the disc means and the inside surface of the container.