초록

This invention relates to a double layer acoustic liner for attenuating noise and consisting of a plurality of cells formed in a plate in a manner to form an array of resonators, and a fluid processing device and method incorporating same.

대표청구항 ▼

This invention relates to a double layer acoustic liner for attenuating noise and consisting of a plurality of cells formed in a plate in a manner to form an array of resonators, and a fluid processing device and method incorporating same. eadrail, a bottom rail and window covering material located

This invention relates to a double layer acoustic liner for attenuating noise and consisting of a plurality of cells formed in a plate in a manner to form an array of resonators, and a fluid processing device and method incorporating same. eadrail, a bottom rail and window covering material located therebetween, the bottom rail being moveable between a fully raised and fully lowered position with respect to the headrail and intermediate positions, comprising: a flexible line storage spool with flexible line spooled thereon and coupled to one of the headrail and bottom rail; and, an adjustable friction member coupled to the line storage spool and the flexible line to adjustably alter the force necessary to effect movement of the bottom rail towards and away from the headrail by way of the line member wherein the adjustable friction member includes the application of a lubricant. 9. The window covering of claim 8, including a spring motor attached to one of the headrail and bottom rail and coupled to he storage spool. 10. The window covering of claim 9, including an additional spring motor mounted serially with the other spring motor. 11. The window covering of claim 8, wherein the lubricant is applied to the storage spool. 12. The window covering of claim 8, wherein the lubricant is applied to the line. 13. The window covering of claim 8, wherein the lubricant includes a friction enhancing material. 14. The window covering of claim 13, wherein the friction enhancing material is selected from a group including wax, grit and sand. 15. The window covering of claim 13, wherein the lubricant is applied between a fixed part and a movable part in the window covering. 16. A window covering of the type including a headrail, a bottom rail and window covering material located therebetween, the bottom rail being moveable between a fully raised and fully lowered position with respect to the headrail and intermediate positions, comprising in combination: a means of motoring attached to one of the headrail and bottom rail and including a means for storing line with flexible line spooled thereon and connected to the other of the headrail and bottom rail; and, a means for adjusting friction engageable with one of the means for motoring, means for storing line and the flexible line to adjustably alter the force necessary to effect movement of the bottom rail towards and away from the headrail by way of the line member wherein the means for adjusting friction includes the application of a lubricant. 17. A window covering in accordance with claim 16, wherein the means for adjusting friction further comprises application of a friction enhancing material. 18. A window covering in accordance with claim 16, including a plurality of means for motoring mounted serially in one of the bottom rail and headrail. 19. The window covering of claim 16, wherein the lubricant is applied to the means for storing line. 20. The window covering of claim 16, wherein the lubricant is applied to the flexible line. 21. The window covering of claim 17, wherein the friction enhancing material is selected from a group including wax, grit, and sand. 22. In a window blind that includes a headrail and a bottom rail with a window covering therebetween, a friction device, and a line storage spool with flexible line coupled thereon, with the flexible line operatively coupled to the headrail and bottom rail, a method for balancing forces in the window blind until an external force is applied sufficient to effect relative displacement of the bottom rail from the headrail, the method comprising the steps of: providing a lubricant; and, applying the lubricant to one of the line storage spool and flexible line to effect retention of the bottom rail relative to the headrail at a point when the external force is removed. 23. The method of claim 22, wherein the step of applying the lubricant includes applying the lubricant to a spring motor operatively coupled to the flexible line. 24. The method of claim 22, wherein the step of applying the lubricant includes applying the lubricant to the friction device. 25. The method of claim 22, wherein the lubricant includes a friction enhancing material. 26. The me