Adjustable rock climbing device

Abstract

A rock climbing device includes two rails each have a slot and a front shaft is positioned between the two rails by engaging with a positioning device in the slots. A rear shaft is fixed connected between the two rails. Two pairs of bars are pivotably connected to a top shaft at one end thereof and the other end of the bars are respectively connected to the front shaft and the, rear shaft. A circular surface member is movably mounted to the front shaft, the rear shaft and the top frame. A plurality of grasp members are removably connected to the surface member and a driving device circulates the surface member.

What is claimed is:  
     
         1 . A rock climbing device comprising: 
 two rails each having a slot defined therethrough and a positioning device connected to the two rails;    a front shaft positioned between the two rails by engaging with the positioning device;    a rear shaft fixed connected between the two rails;    two pairs of bars pivotably connected to a top shaft at one end thereof and the other end of the bars connected to the front shaft and the rear shaft;    a circular surface member movably mounted to the front shaft, the rear shaft and the top frame, a plurality of grasp members removably connected to the surface member, and    a driving device circulating the surface member.    
     
     
         2 . The device as claimed in  claim 1 , wherein the positioning device includes a plurality of notches defined in an inside of each of the slits in the rails.  
     
     
         3 . The device as claimed in  claim 1 , wherein the surface member includes a plurality of protrusions extending from a first side thereof and each of the front shaft, the rear shaft and the top shaft has recesses for receiving the protrusions.  
     
     
         4 . The device as claimed in  claim 1 , wherein the surface member includes a plurality of support frames connected to a second side thereof and each support frame is connected to one grasp member.  
     
     
         5 . The device as claimed in  claim 1 , wherein a weight device is located between the two rails and in front of the surface member, the weight device electrically connected to the driving device.