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US08903276B2 Arm unit with reduced spring load 有权
具有减小弹簧载荷的臂单元

Arm unit with reduced spring load
摘要:
An arm unit includes a first member, a rotation shaft, a second member, a spring member, and a displacement adjusting device. The second member is expandably connected to the first member via the rotation shaft. The spring member is configured to bias the first member and the second member to a direction of expanding the first member and the second member. The displacement adjusting device is configured to displace the spring member at an amount of displacement less than an amount of displacement between the first member and the second member around the rotation shaft.
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