| 摘要 |
A pull-up exercising machine including two opposite handlebars fastened to an upright frame above a base frame, a revolving axle transversely fastened to the upright frame and spaced between handlebars and the base frame, a first supporting rod perpendicularly connected to the revolving axle in the middle, a second supporting rod perpendicularly connected to the revolving axle at one end, a platform hinged to the first supporting rod, a weight holder mounted on the second supporting rod to hold weights, two connecting rods bilaterally connected between the platform and the upright frame to maintain the platform horizontal, and a retracting air cylinder connected between the second supporting rod and the base frame, for buffering the upstroke of the platform to a speed that is safe for the user.
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