09-07-2020 дата публикации
Номер: US20200214466A1
Принадлежит:
A coil-in-coil spring is provided that exhibits a variable and non-linear loading response upon compression. The spring comprises a continuous wire including a first spring portion having a first spring constant, a second spring portion having a second spring constant less than the first spring constant, and a third spring portion having a third spring constant less than the first spring constant and less than the second spring constant. In the coil-in-coil spring, the first spring portion forms an outer coil of the coil-in-coil spring and the second spring portion, the third spring portion, or both the second spring portion and the third spring portion are positioned within the first spring portion and form an inner coil of the coil-in-coil spring. A multi-coil spring is also provided that includes an outer coil, an intermediate coil positioned within the outer coil, and an inner coil positioned with the intermediate coil. 1. A coil-in-coil spring , comprising: a first spring portion having a first spring constant and forming an outer coil of the coil-in-coil spring, said first spring portion having a height;', 'a second spring portion having a second spring constant greater than said first spring constant, the second spring portion having a height less than the height of the outer coil, said second spring portion being positioned within said first spring portion; and,', 'at an upper end of said second spring portion and within said first spring portion or, at an upper end of said first spring portion;', 'a third spring portion having a third spring constant which varies and is less than said second spring portion, the third spring portion being positioned in either, 'the third spring portion having a transition convolution and a plurality of convolutions of differing diameter;', 'wherein each of said first spring portion, said second spring portion and said third spring portion are of different diameters and different spring constants., 'a continuous wire ...
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