| 摘要 |
A structural device composed of lazy-tong frame members is adjusted to different positions by an enclosed piston, which exerts a force upon the structure in a location providing improved stability in the device while the position is being adjusted. Stabilizer arm members situated substantially parallel to the lazy-tong frame members assist in overcoming twisting forces, and consequent lateral movement, created when the position is being adjusted. The lazy-tong frame members and stabilizer arms are mounted at their ends to angle iron corner members which prevent the structure from locking up when such structure is in a collapsed position. Adjustable tension spring loading is provided at the mounting between the lazy-tong frame members and the angle iron corner members, to assist in overcoming and neutralizing inertia and friction in the structure.
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