Patent ID: 8985537
Filing Date: 2015-03-24
Classification: B25J,F16L,F16M,H01R

Abstract:
1. A support arm comprising: a first joint part supported by a base; a second joint part arranged away from said first joint part; a first parallel link arranged between said first joint part and said second joint part and coupled pivotally to said first joint part and said second joint part; and a self-weight compensation device producing a force that cancels a force of gravity acting on said first parallel link, said first parallel link having a first upper shaft, a second upper shaft, and a lower shaft, said first upper shaft and said second upper shaft being arranged in parallel to said lower shaft with spacing therebetween, the spacing being changed with a pivoting movement of said first parallel link, said first upper shaft and said second upper shaft being arranged offset from said lower shaft in a direction of an axis on which said first parallel link is pivoted, when said first parallel link is positioned to extend laterally from said first joint part, said first upper shaft and said second upper shaft being located above said lower shaft, said lower shaft having a thickness greater than the thickness of said first upper shaft and the thickness of said second upper shaft, a wiring line extending from said first joint part toward said second joint part being fixed to said lower shaft, said wiring line being directly supported by said lower shaft between said first joint part and said second joint part, said first upper shaft, said second upper shaft, and said lower shaft being disposed at vertices of a triangle, respectively, said lower shaft being a hollow tubular member having a substantially rectangular sectional shape, and said lower shaft having a top surface located on the outer side of the tubular member, said wiring line being fixed to said top surface.