| 摘要 |
To improve the motion of a platform or bedspring (P) belonging to a liftable bed (10; 100), the platform or bedspring being rotatable about a horizontal axis (X) to vary its own inclination from vertical to horizontal to make a person lie down on it, or vice versa; antagonist force is applied to the platform or bedspring in order to compensate for the weight thereof while passing from vertical to horizontal inclination, or vice versa, wherein the antagonist force is the sum of at least two elastic forces (F1a, F2a; F1b, F2b). |
