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A fluid damper, in particular for moving furniture parts, includes a cylinder and a piston linearly displaceable within the cylinder. The piston has at least one opening for a damping fluid provided in the cylinder, and the fluid damper further includes at least one movable ring disk in the area of

A fluid damper, in particular for moving furniture parts, includes a cylinder and a piston linearly displaceable within the cylinder. The piston has at least one opening for a damping fluid provided in the cylinder, and the fluid damper further includes at least one movable ring disk in the area of the opening(s). The at least one ring disk (8, 9, 10, 11) is arranged such that it at least partially covers the opening(s) (15) of the piston (3) during the damping stroke of the piston (3).

대표청구항 ▼

1. A fluid damper comprising: a cylinder having a cylinder chamber; a piston linearly movable in said cylinder chamber, said piston having at least one opening to allow a flow of a damping fluid through said piston; and a plurality of movable ring disks at said piston in said cylinder chamber, at

1. A fluid damper comprising: a cylinder having a cylinder chamber; a piston linearly movable in said cylinder chamber, said piston having at least one opening to allow a flow of a damping fluid through said piston; and a plurality of movable ring disks at said piston in said cylinder chamber, at least two of said ring disks each having an opening to allow a flow of the damping fluid through said at least two of said ring disks, said ring disks being arranged so as to gradually reduce the flow of the damping fluid through said at least one opening in said piston during a damping stroke of said piston by each of said ring disks at least partially covering openings in other of said ring disks and in said piston behind said each of said ring disks with respect to a damping stroke direction of said piston. 2. The fluid damper of claim 1, wherein said at least one opening of said piston comprises at least one hole in a body of said piston. 3. The fluid damper of claim 1, wherein said plurality of ring disks comprises three ring disks, two of said three ring disks each having at least one opening to allow a flow of the damping fluid through said two ring disks. 4. The fluid damper of claim 1, wherein said ring disks are arranged at a front side of said piston with respect to the damping stroke direction. 5. The fluid damper of claim 1, further comprising a piston rod connected to a first side of said piston, said ring disks being arranged at a second side of said piston opposite said first side. 6. The fluid damper of claim 1, wherein at least two of said ring disks are elastically bendable during the damping stroke. 7. The fluid damper of claim 6, wherein at least two of said ring disks have different rigidities. 8. The fluid damper of claim 7, wherein said ring disks have different thicknesses. 9. The fluid damper of claim 6, wherein each of said elastically bendable ring disks are made of rubber material or plastic material. 10. The fluid damper of claim 6, wherein said at least two elastically bendable ring disks are arranged so as to form ring gaps between said at least two elastically bendable ring disks and a wall of said cylinder chamber. 11. The fluid damper of claim 1, wherein said ring disks are movable in an axial direction. 12. The fluid damper of claim 11, wherein said piston has a pin, said ring disks being axially movably arranged on said pin. 13. The fluid damper of claim 1, wherein each of said ring disks is operable to bend so as to at least partially cover said openings in said ring disks and said piston behind said each of said ring disks. 14. The fluid damper of claim 1, wherein each of said ring disks has a larger number of openings than one of said ring disks directly in front of said each of said ring disks with respect to the damping stroke direction of said piston. 15. The fluid damper of claim 1, wherein said plurality of ring disks includes a front ring disk with respect to the damping stroke direction of said piston, said front ring disk having no openings formed therein. 16. The fluid damper of claim 15, wherein said front ring disk is elastically bendable. 17. The fluid damper of claim 1, wherein each of said ring disks has a ring projection at a hub area. 18. The fluid damper of claim 17, further comprising a flat disk directly in front of said piston and behind said ring disks with respect to the damping stroke direction of said piston, said flat disk being arranged on a pin extending from said piston so as to be freely axially movable on said pin. 19. The fluid damper of claim 1, further comprising springs, one of said springs being arranged between each adjacent pair of said ring disks, and one of said springs being arranged between said piston and one of said ring disks closest to said piston. 20. The fluid damper of claim 19, wherein said springs have different thicknesses. 21. The fluid damper of claim 20, wherein a weakest one of said springs is arranged between said piston and said one of said ring disks closest to said piston, and a strongest one of said springs is located between a front one of said ring disks and a ring disk adjacent to said front one of said spring disks. 22. The fluid damper of claim 1, wherein each of said ring disks has a peripheral ring projection. 23. The fluid damper of claim 1, further comprising at least one spring, one of said at least one spring being arranged between at least one adjacent pair of said ring disks. 24. A fluid damper comprising: a cylinder having a cylinder chamber; a piston linearly movable in said cylinder chamber, said piston having at least one opening to allow a flow of a damping fluid through said piston; and three movable ring disks at said piston in said cylinder chamber, a first one of said ring disks farthest from said piston having no openings, a second one of said ring disks adjacent to said first one of said ring disks having one opening, and a third one of said ring disks adjacent to said second one of said ring disks having two openings, said ring disks being arranged so as to gradually reduce the flow of the damping fluid through said at least one opening in said piston during a damping stroke of said piston. 25. The fluid damper of claim 24, wherein a total cross-sectional area of said two openings of said third ring disk are approximately half as large as a total cross-sectional area of said at least one opening of said piston. 26. A fluid damper comprising: a cylinder having a cylinder chamber; a piston linearly movable in said cylinder chamber, said piston having at least one opening to allow a flow of a damping fluid through said piston; and at least one movable ring disk at said piston in said cylinder chamber, said at least one ring disk being arranged so as to gradually reduce the flow of the damping fluid through said at least one opening in said piston during a damping stroke of said piston by each of said at least one ring disk at least partially covering openings in said at least one ring disk and in said piston being said each of said at least one ring disk with respect to a damping stroke direction of said piston. 27. The fluid damper of claim 26, wherein each of said at least one ring disk is shaped to form a ring gap between each of said at least one ring disk and a wall of said cylinder chamber. 28. The fluid damper of claim 26, wherein said piston is shaped to form a ring gap between said piston and a wall of said cylinder chamber.