Abstract: A counterbalance device for weight training includes a brake unit and a control unit. The brake unit includes an outer cylinder, a resistant spring received in the outer cylinder, and a screw rod extending through the outer cylinder and the resistant spring. The screw rod is connected with a steel cable of a weight training apparatus. An adjusting member is coupled around the screw rod and movably threaded into the resistant spring. A gear is provided at a front end of the resistant spring. The control unit includes a transmission gear which can be driven by a motor and is engaged with the gear. When the motor is actuated, a position of the adjusting member relative to the resistant spring can be changed, so that a number of spring coils of the resistant spring for compressing are changed, therefore a counterbalance of the weight training apparatus can be adjusted.

Abstract: A counterbalance device for weight training includes a brake unit and a control unit. The brake unit includes an outer cylinder, a resistant spring received in the outer cylinder, and a screw rod extending through the outer cylinder and the resistant spring. The screw rod is connected with a steel cable of a weight training apparatus. An adjusting member is coupled around the screw rod and movably threaded into the resistant spring. A gear is provided at a front end of the resistant spring. The control unit includes a transmission gear which can be driven by a motor and is engaged with the gear. When the motor is actuated, a position of the adjusting member relative to the resistant spring can be changed, so that a number of spring coils of the resistant spring for compressing are changed, therefore a counterbalance of the weight training apparatus can be adjusted.