Buffer structure of treadmill

Abstract

A buffer structure of a treadmill includes a load board, two side rods and two tooth racks. The two side rods includes a pair of hand wheels and a pair of gear wheels which are respectively located central sections of the two side rods and connected by a link rod, and a pair of fixing rods disposed under the link rod. The two tooth racks includes toothed portions at upper ends thereof to mesh with the gear wheels, fixing posts at inner sides thereof for insertion of the hollow cylinders, fixing bolts screwed to the fixing posts, and two slots at two sides of the fixing bolts. The two slide bolts are inserted through two through holes of the two side rods and the two slots and connected with nuts and washers. A gap is formed between the tooth racks and the side rods for slide.

What is claimed is: 
     
         1 . A buffer structure of a treadmill, comprising a load board, two side rods and two tooth racks;
 the load board comprising a pair of buffer units under two sides thereof, the buffer units comprising a plurality of buffer members to lean against upper ends of hollow cylinders of the tooth racks;   the two side rods comprising a pair of hand wheels and a pair of gear wheels which are respectively located at outer and inner sides of central sections of the two side rods, a link rod connecting the hand wheels and the gear wheels and a pair of fixing rods disposed under the link rod, the fixing rods each having two through holes;   the two tooth racks comprising toothed portions at upper ends thereof to mesh with the gear wheels, fixing posts at inner sides thereof for insertion of the hollow cylinders, fixing bolts screwed to the fixing posts, and two slots at two sides of the fixing bolts, the two slide bolts being inserted through the two through holes of the two side rods and the two slots and connected with nuts and washers, a gap being formed between the tooth racks and the side rods for slide;   thereby, by turning either of the hand wheels, the link rod and the two gear wheels being driven to mesh with the two tooth portions so that the two tooth racks being slid through the two slots, the hollow cylinders being moved to be under the desired buffer members.   
     
     
         2 . The buffer structure of a treadmill as claimed in  claim 1 , wherein the link rod is connected between the two fixing posts, the link rod having threaded sections at two ends thereof for connection of the two fixing posts and stop walls to confine rotation of the hollow cylinders. 
     
     
         3 . The buffer structure of a treadmill as claimed in  claim 1 , wherein a motor is provided at one end of the buffer unit under either side of the load board close to the gear wheel of the corresponding side rod, the motor comprising a transmission gear wheel to mesh with the corresponding gear wheel. 
     
     
         4 . The buffer structure of a treadmill as claimed in  claim 1 , wherein the slide bolts are provided with sleeves to slide in the slots with ease.