| 摘要 |
PCT No. PCT/DK88/00133 Sec. 371 Date Mar. 14, 1989 Sec. 102(e) Date Mar. 14, 1989 PCT Filed Aug. 11, 1987 PCT Pub. No. WO89/01577 PCT Pub. Date Feb. 23, 1989.A spring for compression and tension mainly in an axial direction and made of a material having a Young's modulus of elasticity of at least 39 GPa, such as metal, steel, glass, plastic or reinforced plastic is disclosed. The spring is in the form of a tube or ring of generally constant thickness. In cross-section, each ring is made up of oppositely directed inner and outer U-shaped spring parts with contiguous axial projections. A spring is provided which has minimal elastic hysteresis.
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