Patent ID: 7927027
Filing Date: 2011-04-19
Classification: F16M,G03B,H04N,Y10T

Abstract:
1. An arm pivot shaft support mechanism configured to support an arm extended from an instrument unit with an internal electric instrument incorporated therein, the arm pivot shaft support mechanism comprising: bifurcated arm-side engagement legs provided on a terminal end of the arm; a rotation support-side engagement leg provided on an opposed end, which is opposed to the terminal end of the arm, of a rotation support arm, on which the arm is supported in a pivotally rotatable manner; a pivot shaft inserted and fitted in through holes formed in the arm-side engagement legs and the rotation support-side engagement leg to support the arm via the arm-side engagement legs to be pivotally rotatable relative to the rotation support-side engagement leg; a first engagement leg internal member and a second engagement leg internal member located on one of the bifurcated arm-side engagement legs and arranged to be respectively rotatable about the pivot shaft; and a third engagement leg internal member located on the other of the bifurcated arm-side engagement legs and arranged to be rotatable about the pivot shaft, wherein the first engagement leg internal member has: an arc-shaped base-side peripheral wall protruded toward the third engagement leg internal member to fill a space on a bifurcation base side between the bifurcated arm-side engagement legs; and a base-side cord pathway formed in the base-side peripheral wall to receive and allow for passage of a cord extended from the internal electric instrument, the second engagement leg internal member has: an arc-shaped end-side peripheral wall protruded toward the third engagement leg internal member to fill a space on a bifurcation end side between the bifurcated arm-side engagement legs; and an end-side cord pathway formed in the end-side peripheral wall to receive and allow for passage of the cord with avoiding interference with the pivot shaft, the third engagement leg internal member has: arc-shaped block peripheral walls protruded toward the first engagement leg internal member and the second engagement leg internal member to fill spaces between edges of the base-side peripheral wall and edges of the end-side peripheral wall.