| 摘要 |
A first link member 4 is swingably connected to the base member 2 on a forward side, and a second link member 5 is swingably connected to the base member 2 on a backward side. A third link member 6 is swingably connected to the output member 3 on the forward side, and a fourth link member 7 is swingably connected to the output member 3 on the backward side. A swinging end of the third link member 6 is swingably connected to the first link member 4 on a first connecting axis J5, and a swinging end of the fourth link member 7 on the backward side is swingably connected to the first link member 4 on a second connecting axis J6. A swinging end of the second link member 5 is swingably connected to the fourth link member 7 on a third connecting axis J7.
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