IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0192015
(2005-07-29)
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우선권정보 |
AT-GM43/2003(2003-01-30) |
발명자
/ 주소 |
- Gassner,Daniel
- Krammer,Bernhard
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출원인 / 주소 |
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
5 |
초록
▼
A damper has a cylinder and a piston, the piston having two or more parts. A first piston part is made of a rubber-elastic material forced against the cylinder wall during a damping stroke. A second piston part is made of a material that is stiffer in comparison to the rubber-elastic material. The
A damper has a cylinder and a piston, the piston having two or more parts. A first piston part is made of a rubber-elastic material forced against the cylinder wall during a damping stroke. A second piston part is made of a material that is stiffer in comparison to the rubber-elastic material. The second piston part as seen in the radial direction lies between an area of the first piston part and the cylinder wall. The first piston part may have at least two sections of different hardnesses over its lengths. The piston could also include a piston part that is radially forced outwards to rub against the cylinder wall during damping, the piston part being made as a solid body of a material with rubber-elastic properties which becomes flattened under pressure, deforming in such a way that a friction seal is created between the piston part and the cylinder wall.
대표청구항
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The invention claimed is: 1. A damper comprising: a cylinder having a cylinder wall; and a piston movable within said cylinder, said piston including: a first piston part made of a rubber-elastic material, said first piston part having a radially-expandable main body portion operable to expand and
The invention claimed is: 1. A damper comprising: a cylinder having a cylinder wall; and a piston movable within said cylinder, said piston including: a first piston part made of a rubber-elastic material, said first piston part having a radially-expandable main body portion operable to expand and substantially fill an entire cross-sectional area of said cylinder so as to contact and be pressed against said cylinder wall during a damping stroke of said damper, and having a sealing lip portion shaped and arranged to maintain a constant contact with said cylinder wall of said cylinder; and a second piston part connected to said first piston part and made of a stiffer material as compared to said rubber-elastic material of said first piston part. 2. The damper of claim 1, wherein said second piston part is made of a rigid material. 3. The damper of claim 1, wherein said second piston part has a front recess portion, a base end of said first piston part being located in said front recess portion of said second piston part. 4. The damper of claim 1, wherein said front recess portion comprises a three-dimensionally curved recess. 5. The damper of claim 3, wherein said front recess portion comprises an approximately spherically-shaped recess. 6. The damper of claim 3, wherein said first piston part and said second piston part are shaped and arranged such that said base end of said first piston part only partially fills said front recess portion in unpressurized conditions and substantially fills said front recess portion in pressurized conditions during damping. 7. The damper of claim 1, further comprising a piston rod for acting as a ram, said second piston part being located between said first piston part and said piston rod. 8. The damper of claim 1, wherein said first piston part has a cone-shaped mantle. 9. The damper of claim 8, wherein said cone-shaped mantle is tapered toward said second piston part. 10. The damper of claim 8, wherein said cone-shaped mantle is tapered toward a distal end of said first piston part relative to said second piston part. 11. The damper of claim 1, wherein said first piston part has a base end closest to said second piston part, said base end having a graduated shape. 12. The damper of claim 1, wherein said first piston part has a base end closest to said second piston part, said base end having a snap ring groove. 13. The damper of claim 1, wherein said first piston part has a plurality of snap ring grooves spaced apart along a longitudinal axis of said first piston part, and has a plurality of piston lands, each of said piston lands being located between a respective pair of adjacent snap ring grooves. 14. The damper of claim 13, wherein a diameter of each of said piston lands is smaller in a direction approaching said second piston part. 15. The damper of claim 1, wherein said first piston part has a peg-type projection for attaching said first piston part to said second piston part. 16. The damper of claim 15, wherein said first piston part and said second piston part are shaped and arranged so that said peg-type projection is axially displaceable within said second piston part. 17. The damper of claim 1, wherein said second piston part encircles a mantle of said first piston part in a manner of a belt. 18. The damper of claim 17, wherein said second piston part comprises a network encircling said first piston part. 19. The damper of claim 1, wherein said first piston part has a cavity in an area adjacent to said second piston part, said cavity extending over less than half of an axial length of said first piston part. 20. The damper of claim 1, wherein a hardness of said first piston part is in a range between 40 A and 85 Shore. 21. The damper of claim 1, wherein said second piston part comprises a bolster plate connected to a piston rod. 22. The damper of claim 1, wherein said first piston part is monolithic such that said main body portion and said sealing lip portion have a one-piece construction. 23. The damper of claim 1, wherein said main body portion of said first piston part is made of a material having a different hardness than a material of said sealing lip portion of said first piston part. 24. The damper of claim 1, wherein said main body portion of said first piston part and said sealing lip portion of said first piston part are welded together. 25. The damper of claim 1, wherein said main body portion of said first piston part and said sealing lip portion of said first piston part are glued together. 26. The damper of claim 1, wherein said first piston part has an axial groove extending through a surface of at least said main body portion. 27. The damper of claim 1, wherein said main body portion of said first piston part has a cylindrical shape in an unpressurized condition, and has a domed shape in a pressured condition during damping. 28. The damper of claim 1, further comprising a compression spring in said cylinder, said spring having a first end abutting against a front wall of said cylinder and having a second end abutting against said piston, a spring force of said spring being such that a force of movement of said piston through said cylinder is greater than said spring force of said spring. 29. The damper of claim 1, wherein at least a portion of said second piston part is located between said first piston part and said cylinder wall with respect to a radial direction of said damper. 30. The damper of claim 1, wherein said first piston part and said cylinder are shaped and arranged such that, when said piston is not being pressurized during damping, a gap is defined between said main body portion of said first piston part and said cylinder wall of said cylinder. 31. The damper of claim 1, further comprising a piston rod connected to said second piston part for moving said piston through said cylinder, said piston rod having a plurality of axial ribs for supporting said piston rod within said cylinder. 32. A damping arrangement comprising: a plurality of movable furniture parts; and said damper of claim 1 arranged between a first one of said furniture parts and a second one of said furniture parts so as to dampen a relative movement between said first one of said furniture parts and said second one of said furniture parts. 33. A damper comprising: a cylinder having a cylinder wall; a piston movable within said cylinder, said piston including: a first piston part made of a rubber-elastic material, said first piston part having a radially-expandable main body portion operable to expand and substantially fill an entire cross-sectional area of said cylinder so as to contact and be pressed against said cylinder wall during a damping stroke of said damper; and a second piston part connected to said first piston part and made of a stiffer material as compared to said rubber-elastic material of said first piston part; and a piston rod for acting as a ram, said second piston part being located between said first piston part and said piston rod. 34. The damper of claim 33, wherein said second piston part has a front recess portion, a base end of said first piston part being located in said front recess portion of said second piston part. 35. The damper of claim 33, wherein said main body portion of said first piston part is cone-shaped. 36. The damper of claim 35, wherein said cone-shaped main body portion is tapered toward said second piston part. 37. The damper of claim 35, wherein said cone-shaped main body portion is tapered toward a distal end of said first piston part relative to said second piston part. 38. The damper of claim 33, wherein said first piston part has a base end closest to said second piston part, said base end having a snap ring groove. 39. The damper of claim 33, wherein said first piston part has a plurality of snap ring grooves spaced apart along a longitudinal axis of said first piston part, and has a plurality of piston lands, each of said piston lands being located between a respective pair of adjacent snap ring grooves. 40. The damper of claim 39, wherein a diameter of each of said piston lands is smaller in a direction approaching said second piston part. 41. The damper of claim 33, wherein said first piston part has a peg-type projection for attaching said first piston part to said second piston part. 42. The damper of claim 41, wherein said first piston part and said second piston part are shaped and arranged so that said peg-type projection is axially displaceable within said second piston part. 43. The damper of claim 33, wherein said first piston part has a cavity in an area adjacent to said second piston part, said cavity extending over less than half of an axial length of said first piston part. 44. The damper of claim 33, wherein said first piston part further has a sealing lip portion shaped and arranged to maintain a constant contact with said cylinder wall of said cylinder, said first piston part being monolithic such that said main body portion and said sealing lip portion have a one-piece construction. 45. The damper of claim 33, wherein said first piston part further has a sealing lip portion shaped and arranged to maintain a constant contact with said cylinder wall of said cylinder, said main body portion of said first piston part being made of a material having a different hardness than a material of said sealing lip portion of said first piston part. 46. The damper of claim 33, wherein said first piston part has an axial groove extending through a surface of at least said main body portion. 47. The damper of claim 33, further comprising a compression spring in said cylinder, said spring having a first end abutting against a front wall of said cylinder and having a second end abutting against said piston, a spring force of said spring being such that a force of movement of said piston through said cylinder is greater than said spring force of said spring. 48. The damper of claim 33, wherein at least a portion of said second piston part is located between said first piston part and said cylinder wall with respect to a radial direction of said damper. 49. The damper of claim 33, wherein said first piston part and said cylinder are shaped and arranged such that, when said piston is not being pressurized during damping, a gap is defined between said main body portion of said first piston part and said cylinder wall of said cylinder. 50. The damper of claim 33, further comprising a piston rod connected to said second piston part for moving said piston through said cylinder, said piston rod having a plurality of axial ribs for supporting said piston rod within said cylinder. 51. A damping arrangement comprising: a plurality of movable furniture parts; and said damper of claim 33 arranged between a first one of said furniture parts and a second one of said furniture parts so as to dampen a relative movement between said first one of said furniture parts and said second one of said furniture parts.
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