Water-level measuring device using gear ratio

Abstract

A water-level measuring device using a gear ratio includes: a water pool filled with a liquid; a plot receiving buoyancy by being floated over a water surface of the liquid filled in the water pool; a cable connected to the plot and extending to the outside of the water pool; a first gear connected with the cable; a second gear connected with the first gear; a weight pendulum connected with the second gear and moving in up and down directions, wherein when a water level of the water pool descends, the weight pendulum ascends due to a weight of the plot, and when the water level of the water pool ascends, the weight pendulum descends due to the buoyancy of the plot.

What is claimed is: 
     
         1 . A water-level measuring device measuring a water level by using a gear ratio, the water-level measuring device comprising:
 a water pool filled with a liquid;   a plot receiving buoyancy by being floated over a water surface of the liquid filled in the water pool;   a cable connected to the plot and extending to the outside of the water pool;   a first gear connected with the cable;   a second gear connected with the first gear;   a weight pendulum connected with the second gear and moving in up and down directions,   wherein when the water level of the water pool descends, the weight pendulum ascends due to a weight of the plot, and when the water level of the water pool ascends, the weight pendulum descends due to the buoyancy of the plot.   
     
     
         2 . The water-level measuring device of  claim 1 , further comprising
 a water-level indicator connected with the first gear and configured to indicate the water-level of the water pool to the outside via rotation of the first gear.   
     
     
         3 . The water-level measuring device of  claim 1 , wherein the weight of the plot is greater than a weight of the weight pendulum, and
 the weight of the weight pendulum is greater than a weight of the cable.   
     
     
         4 . The water-level measuring device of  claim 3 , wherein the weight of the plot is greater than a sum of the weight of the weight pendulum and the weight of the cable. 
     
     
         5 . The water-level measuring device of  claim 1 , wherein the water pool includes a support wall which vertically extends and into which the plot is inserted. 
     
     
         6 . The water-level measuring device of  claim 1 , further comprising:
 a connector connected with the weight pendulum and configured to slidingly move in up and down directions; and   a bracket which vertically extends and into which the connector is inserted.   
     
     
         7 . The water-level measuring device of  claim 1 , further comprising
 a water-surface indicator connected with the weight pendulum and arranged outside the water pool,   the water-surface indicator being configured to indicate a level of the water surface of the water pool.   
     
     
         8 . The water-level measuring device of  claim 1 , further comprising
 a water-level transmitter including a space into which the weight pendulum is inserted and in which the weight pendulum is configured to move,   wherein the weight-level transmitter is configured to transmit a signal to the outside according to a movement of the weight pendulum.   
     
     
         9 . The water-level measuring device of  claim 8 , wherein the water-level transmitter includes:
 a housing including a space into which the weight pendulum is inserted and in which the weight pendulum is configured to move;   an input terminal connected with the housing and configured to supply a voltage; and   an output terminal connected with the housing and configured to generate a voltage according to the movement of the weight pendulum.   
     
     
         10 . The water-level measuring device of  claim 9 , wherein the input terminal includes a battery.