Liquid-resistance fitness machine

Abstract

A liquid-resistance fitness machine has a frame body, a liquid-resistance device mounted to the frame body, and a driving device. The liquid-resistance device has a liquid tank, a shaft, and a paddle wheel set. The paddle wheel set has a hub fixed to the shaft and multiple blades. The driving device is connected to the shaft and is configured to drive the shaft to spin clockwise and counterclockwise relative to the liquid tank. A shape of each of the blades when the shaft is spinning clockwise and a shape of the blade when the shaft is spinning counterclockwise are asymmetrical to a normal line between the blade and the hub. Therefore, the liquid-resistance device can provide two different liquid resistances without changing the volume of the liquids.

What is claimed is: 
     
         1 . A liquid-resistance fitness machine comprising:
 a frame body;   a liquid-resistance device mounted to the frame body and comprising
 a liquid tank mounted to the frame body; 
 a shaft rotatably connected to the liquid tank and extending into the liquid tank; 
 a paddle wheel set surrounding and fixed to the shaft, disposed in the liquid tank, and having
 a hub surrounding and fixed to the shaft; and 
 multiple blades arranged around the hub at angular intervals; and 
 
   a driving device connected to the shaft of the liquid-resistance device and configured to drive the shaft of the liquid-resistance device to spin clockwise and counterclockwise relative to the liquid tank; wherein   a shape of each of the blades when the shaft is spinning clockwise and a shape of the blade when the shaft is spinning counterclockwise are asymmetrical to a normal line between the blade and the hub.   
     
     
         2 . The liquid-resistance fitness machine as claimed in  claim 1 , wherein each of the blades of the paddle wheel set is pivotally connected to the hub of the paddle wheel set via one of two ends of the blade to allow the blade to swing relative to the hub of the paddle wheel set. 
     
     
         3 . The liquid-resistance fitness machine as claimed in  claim 2 , wherein
 the hub of the paddle wheel set has multiple blade holders arranged at angular intervals;   each of the blade holders has a stopping block;   each of the blades of the paddle wheel set is pivotally connected to a respective one of the blade holders and has an unfolded position and a folded position; and   when each of the blades of the paddle wheel set is in the unfolded position, the blade abuts against and is blocked by the stopping block of the respective one of the blade holders.   
     
     
         4 . The liquid-resistance fitness machine as claimed in  claim 3 , wherein each of the blades is curved. 
     
     
         5 . The liquid-resistance fitness machine as claimed in  claim 4 , wherein
 each of the blades of the paddle wheel set has two connecting portions respectively located at two opposite ends of the blade and adjacent to the hub of the paddle wheel set;   the paddle wheel set comprises two resilient rings;   the connecting portions of the blades at one of the two ends of the blades are surrounded by and are connected to a respective one of the two resilient rings.   
     
     
         6 . The liquid-resistance fitness machine as claimed in  claim 1 , wherein
 the liquid-resistance device comprises multiple said paddle wheel sets arranged along and fixed to the shaft.   
     
     
         7 . The liquid-resistance fitness machine as claimed in  claim 2 , wherein
 the liquid-resistance device comprises multiple said paddle wheel sets arranged along and fixed to the shaft.   
     
     
         8 . The liquid-resistance fitness machine as claimed in  claim 3 , wherein
 the liquid-resistance device comprises multiple said paddle wheel sets arranged along and fixed to the shaft.   
     
     
         9 . The liquid-resistance fitness machine as claimed in  claim 4 , wherein
 the liquid-resistance device comprises multiple said paddle wheel sets arranged along and fixed to the shaft.   
     
     
         10 . The liquid-resistance fitness machine as claimed in  claim 5 , wherein
 the liquid-resistance device comprises multiple said paddle wheel sets arranged along and fixed to the shaft.   
     
     
         11 . The liquid-resistance fitness machine as claimed in  claim 6 , wherein
 each adjacent two of the paddle wheel sets are connected by a respective connecting ring fixed to the shaft; wherein   two ends of the connecting ring are respectively inserted into the hubs of the adjacent two of the paddle wheel sets.   
     
     
         12 . The liquid-resistance fitness machine as claimed in  claim 7 , wherein
 each adjacent two of the paddle wheel sets are connected by a respective connecting ring fixed to the shaft; wherein   two ends of the connecting ring are respectively inserted into the hubs of the adjacent two of the paddle wheel sets.   
     
     
         13 . The liquid-resistance fitness machine as claimed in  claim 8 , wherein
 each adjacent two of the paddle wheel sets are connected by a respective connecting ring fixed to the shaft; wherein   two ends of the connecting ring are respectively inserted into the hubs of the adjacent two of the paddle wheel sets.   
     
     
         14 . The liquid-resistance fitness machine as claimed in  claim 9 , wherein
 each adjacent two of the paddle wheel sets are connected by a respective connecting ring fixed to the shaft; wherein   two ends of the connecting ring are respectively inserted into the hubs of the adjacent two of the paddle wheel sets.   
     
     
         15 . The liquid-resistance fitness machine as claimed in  claim 10 , wherein
 each adjacent two of the paddle wheel sets are connected by a respective connecting ring fixed to the shaft; wherein   two ends of the connecting ring are respectively mounted into the hubs of the adjacent two of the paddle wheel sets.   
     
     
         16 . The liquid-resistance fitness machine as claimed in  claim 1 , wherein the driving device is a pull-strap device. 
     
     
         17 . The liquid-resistance fitness machine as claimed in  claim 2 , wherein the driving device is a pull-strap device. 
     
     
         18 . The liquid-resistance fitness machine as claimed in  claim 3 , wherein the driving device is a pull-strap device. 
     
     
         19 . The liquid-resistance fitness machine as claimed in  claim 4 , wherein the driving device is a pull-strap device. 
     
     
         20 . The liquid-resistance fitness machine as claimed in  claim 5 , wherein the driving device is a pull-strap device.