showstack / glossary / shackle
Shackle 卸扣
The U-shaped steel connector, closed with a pin, that joins a sling or steel to a hoist, a beam clamp or a truss. Rated by working load limit and stamped with it; the pin type matters, since a screw pin can back out under a rotating load where a bolt-type pin will not.
中文
U 形鋼製連接件，以插銷閉合，用來把吊帶或鋼索連到葫蘆、樑夾或桁架上。以工作負載限值分級並打印在本體上。插銷型式很重要：螺旋插銷在負載轉動時可能鬆脫，螺栓型則不會。
Regional usage
| Where | Term | Note |
|---|---|---|
| UK / US | Shackle / bow shackle / D shackle | |
| HK / TW | 卸扣 / U 型扣 |
Easy to get wrong
A hardware-store shackle that looks identical is not rated and is not traceable. Only a marked, rated shackle from a known batch belongs above people.
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Sources
- Theatrecrafts glossary of technical theatre terms — Theatrecrafts / ABTT heritage primary
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