| 摘要 |
A spring assembly for counterbalancing a door includes a compression spring and tension members engaging opposite ends of the spring. The tension members can be connected in a conventional door mechanism, the assembly replacing ordinary tension springs of the mechanism. The tension members and the spring are maintained in axial alignment during compression of the spring, which can be preloaded as desired. The assembly is fail-safe in that the spring is completely enclosed and the spring, if broken, continues to provide support for the door.
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