Height adjusting device for a platform of a treadmill

Abstract

A height adjusting device includes two lifting arms pivotally mounted to a main frame of a treadmill. Each lifting arm has a first end pivotally mounted to the main frame and a second end upwardly extending therefrom. The second end of each of the two lifting arms is pivotally connected to two opposite sides of the platform. A lateral rod has two opposite ends respectively secured on the two lifting arms such that the two lifting arms are synchronously operated and a pivot seat formed on a middle section of the lateral rod. A telescopic rod has a first end pivotally connected to the pivot seat and a second end pivotally mounted to a bottom of the platform for reciprocally driving the lateral rod and the two lifting arms to adjust a height of the platform.

1 . A height adjusting device for a platform of a treadmill, comprising: 
 two lifting arms respectively adapted to be pivotally mounted to two opposite ends of a main frame of the treadmill, each lifting arm having a first end adapted to be pivotally mounted to the main frame and a second end upwardly extending from each of the two lifting arms, the second end of each of the two lifting arms adapted to be pivotally connected to a corresponding one of two opposite sides of the platform;    a lateral rod having two opposite ends respectively secured on the two lifting arms such that the two lifting arms are synchronously operated, the lateral rod having a pivot seat formed on a middle section thereof, the pivot seat having a connecting portion extending therefrom and corresponding to the second end of each of the two lifting arms; and    a telescopic rod having a first end pivotally connected to the connecting portion of the pivot seat and a second end adapted to be pivotally mounted to a bottom of the platform for reciprocally driving the lateral rod and the two lifting arms to adjust a height of the platform.    
   
   
       2 . The height adjusting device as claimed in  claim 1  further comprising a power source mounted adjacent the telescopic rod for reciprocally driving the telescopic rod.  
   
   
       3 . The height adjusting device as claimed in  claim 1 , wherein the telescopic rod is a threaded rod.  
   
   
       4 . The height adjusting device as claimed in  claim 2 , wherein the telescopic rod is a threaded rod.