Electronic running exercise machine with a bidirectional supersonic detector

Abstract

An electronic running exercise machine with a bidirectional supersonic detector has a running belt. A front end of the running belt has a driving device for driving the running belt. Two sides of a front end of the electronic running exercise machine have respective U-like handle rods. A control panel is installed between the two handle rods. The supersonic detector has a control portion and a reflecting portion. The control portion is installed in a control panel of the electronic running exercise machine. The reflecting portion is worn on the runner. The reflecting portion emits supersonic wave to the control portion. The control portion measures the time interval required at the two ends precisely and then the time interval is converted into a distance so as to be transferred to the control panel. Therefore, the rotary speed of the running belt is controlled precisely.

What is claimed is:  
     
         1 . An electronic running exercise machine with a bidirectional supersonic detector; the electronic running exercise machine having a running belt; a front end of the running belt having a driving device for driving the running belt; two sides of a front end of the electronic running exercise machine having respective U-like handle rods; a control panel being installed between the two handle rods; characterized in that: 
 the supersonic detector has a control portion and a reflecting portion; the control portion is installed in a control panel of the electronic running exercise machine; the reflecting portion is worn on the runner; the reflecting portion emits supersonic wave to the control portion; the control portion measures a time interval required from emitting supersonic wave to receive supersonic wave precisely and then the time interval is converted into a distance so that the value of the distance is transferred to the control panel; therefore, a rotary speed of the running belt is controlled precisely.    
     
     
         2 . The electronic running exercise machine with a bidirectional supersonic detector as claimed in  claim 1 , wherein the control portion is installed within the control panel of the electronic running exercise machine, and the control panel has the functions of receiving and transmitting supersonic waves at a direction facing the running belt.  
     
     
         3 . The electronic running exercise machine with a bidirectional supersonic detector as claimed in  claim 1 , further comprising an infrared transmitter and an infrared receiver, which cause the instruments of the control portion and the reflecting portion to operate synchronously.  
     
     
         4 . The electronic running exercise machine with a bidirectional supersonic detector as claimed in  claim 3 , wherein the infrared transmitter is installed in the control portion and the infrared receiver is installed in the reflecting portion.  
     
     
         5 . The electronic running exercise machine with a bidirectional supersonic detector as claimed in  claim 1 , wherein the control portion has an infrared transmitter, a supersonic receiver, a numeric calculator, and an actuator and the reflecting portion has an infrared receiver, and a supersonic transmitter; when the actuator of the control portion is actuated, the control portion will emit a set of infrared signals to the infrared receiver of the reflecting portion through the infrared transmitter; when the infrared receiver of the reflecting portion has received infrared, the supersonic transmitter transmits a set of supersonic wave to return to the supersonic receiver of the control portion; by the time difference between the time transmitting the infrared and the time receiving the supersonic wave, the numeric calculator of the control portion calculates the distance between the transmitting end and the receiving end and then a calculated result is transferred to the control panel of the electronic running exercise machine; thereby, the operation speed of the running belt can be controlled precisely.  
     
     
         6 . The electronic running exercise machine with a bidirectional supersonic detector as claimed in  claim 1 , wherein the control portion is installed with a noise filter for determining whether the supersonic waves from the reflecting portion are noises due to effects from environment.