Spherical 4-bar linkage mechanism 6b

Input: pink oblique crank rotating full revolution. Oblique angle A1 = 45 degrees. A1 cannot exceed 90 degrees. Output: green fork shaft performing angular oscillation. Oscillating angle A2 = 2*A1 = 90 degrees. Axes of all revolution joints intersect at a common point. The last scene of the video shows the case when A1 = 85 degrees, A2 = 170 degrees. Inventor files of this video:
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