| 摘要 |
PURPOSE: A spring balance is provided to prevent breakage of a component by equally maintaining resilient force of a spring without considering pulling distance. CONSTITUTION: A spring balance comprises front and rear cases(110,120) combined each other by a bolt; a drum(200) rotationally combined to a rotational shaft(220) by being mounted in the case; a recessed groove unit(210) formed on an outer circumference of the drum; a wire rope(230) wound on the recessed groove unit; a spring(300) received in the drum; a clutch unit maintaining winding direction of the spring; a unidirectional gear(410) integrally formed on an end portion of the rotational shaft; and a stopper(420) elastically supported by being geared with the unidirectional gear. Thereby, the spring balance prevents breakage of a component by equally maintaining resilient force of the spring. |
