| 摘要 |
A self-spotting barbell press is composed of an adjustable bench and uprights located on either side of the bench adjacent the lifters upper body. Barbell support arms extend from the uprights into the barbell's pathway and have the ability to slide up and down to contact the barbell and decrease the weight exerted on the exerciser. A single hydraulic cylinder in conjunction with a pulley system provides force to each lifting arm, which is depressed below the barbell's path before use. When assistance is needed, the weightlifter places a three-way valve into a valve position that allows hydraulic fluid under pressure to flow from an accumulator tank to a hydraulic cylinder with push-rod that causes the barbell support arms to ascend removing a user-determined amount of weight from the barbell. If the total amount of weight is not to be removed, the user can continue performing repetitions with assistance from the hydraulic system. Another valve position allows only upward movement should the exerciser fail.
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