A strength training control device using a motor assembled beam-type load cell, comprising:
- a) a base frame;
- b) a torque source, fixed onto the base frame, and comprising a motor and a gear reduction box, wherein the motor is a brushless motor or a DC motor, and an end of the gear reduction box is coupled to the motor, and another end of the gear reduction box includes a main shaft;
- c) a drive arm having a depressing surface at the top of the internal side of the top end thereof and a flange at each side of the bottom end thereof, the flange having at the center thereof a shaft hole for slipping over the main shaft;
- d) an operating rod with the bottom pivotally coupled to the base frame and serving as a control element for training the muscle of an operator;
- e) a link mechanism including:
- i) a rocker arm with the bottom portion thereof mounted onto the operating rod such that it is driven by the operating rod;
- ii) a front and a rear plate each having a central hole at the bottom thereof, respectively, such that they are pivotally coupled to the flanges at both sides of the drive arm;
- and
- iii) a connecting rod with both ends pivotably and respectively coupled to the top of the rocker arm and the top of the front and rear plates, whereby, when the operating rod is activated, the rocker arm pulls (pushes) the connecting rod to impart a rotary motion in the forward or the reverse direction to the front and rear plates;
- f) a beam-type load cell secured to the side of the drive arm with one end thereof resting against the depressing surface, whereby, when the front and rear plates are reversely rotated, one end of the beam-type load cell rests against the drive arm to conduct a reverse rotation.
- g) an electronic meter, fixed onto the base frame, and provided for a user to set a required torque value;
- and
- h) a servo controller, for comparing the difference between a sensed value of the beam-type load cell and a set value of the electronic meter and after the difference value is adjusted, an electric current is output to drive the motor;
- wherein the torque produced by the motor is amplified by the gear reduction box to adjust the actual torque value to the desired set value;
- and
- wherein, when the operator works on the operating rod, the beam-type load cell will be activated via the link mechanism to force it to conduct an reverse rotation on the drive arm such that the torque acts on the operating rod to create a load resistance and the muscle of the operator is loaded by this resistance to achieve a desirable training effect.