Track-variable Smith machine

Abstract

The invention particularly relates to a track-variable Smith machine which is characterized in that a rack comprises an upper cross beam, movable side supports and a bottom frame, each movable side support is of a frame-shaped structure, a vertical balance weight guide rod is arranged in each movable side support, a sliding balance weight set is arranged on each balance weight guide rod, and the bottoms of the two movable side supports are hinged to the bottom frame through pin shafts respectively, the upper ends of the two movable side supports are hung on the upper cross beam through movable pulleys respectively, the upper cross beam comprises two symmetrical circumferential tracks, the upper end faces of the circumferential tracks are in an arc shape, the radius of the circumferential tracks is equal to the distance between the lower end faces of the movable pulleys and pin shafts at the bottoms of the corresponding movable side supports, and the two circumferential tracks are provided with a plurality of symmetrical track lock holes, movable side support lock holes matched with the movable side supports are formed in the upper portions of the two movable side supports, and locking bolts penetrate through the movable side support lock holes and the track lock holes to fix the upper ends of the movable side supports to the circumferential track. The machine has the advantages of being reasonable in structure, flexible and convenient to use, multiple in function and good in training and rehabilitation effect.

Description

technical field [0001] The invention belongs to the field of fitness and rehabilitation equipment, and in particular relates to a variable trajectory Smith machine. Background technique [0002] Smith Machine, also known as Smith Rack, is a common fitness and rehabilitation equipment. Its barbell is controlled by longitudinal rails at both ends, and the sliding track is limited. The safety factor is high, and trainers can use large weights with confidence. Not only limited to squat training, but also bench press (incline, plank, decline), prone rowing, biceps curl and other barbell training. [0003] In October 2019, "Beijing Biomedical Engineering" Volume 38, Issue 5 published the article "The Influence of Training Trajectory on Upper Limb Muscle Synergy", which disclosed the following conclusion: the training trajectory of the upper limb has a certain influence on the characteristics of the upper limb muscles, and different training trajectories The muscle synergy structu...

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Problems solved by technology

[0003] In October 2019, "Beijing Biomedical Engineering" Volume 38, Issue 5 published the article "The Influence of Training Trajectories on Upper Limb Muscle Synergy", which disclosed the following conclusions: the training trajectory of the upper limbs has a certain influence on the characteristics of the upper limb muscles, and different training trajectories The synergistic structure of the muscles brought about is relatively similar, but the proportion of the flexor muscle group and the synergistic contribution will change for the purpose of coordinating the movement during exercise. From this, it can be speculated that different training trajectories may have different training intensities for different muscle groups

In the existing Smith machine, the counterweight guide rods are arranged vertically in parallel, and the counterweight on the counterweight guide rods can only move vertically upwards and downwards, resulting in the inability to change the motion trajectory, which cannot adapt to different action training requirements

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