Roller skate having a safety device

Abstract

A roller skate includes a fixing seat, a plurality of wheels, and a safety device mounted on the wheel. The safety device includes a safety member mounted on the fixing seat and urged on the wheel, so as to adjust a rotation speed of the wheel. Thus, the roller skate can be fixed on the ground without rotation by the safety device, so that the learner can stand on the roller skate without movement so as to practice his/her balance. In addition, the safety member is slightly loosened from the wheels, so that the wheels are rotated at a lower speed, thereby facilitating the learner practicing the skating skill.

What is claimed is:  
     
         1 . A roller skate, comprising: 
 a fixing seat;    a plurality of wheels each rotatably mounted on the fixing seat;    a safety device mounted on at least one of the wheels, wherein:    the safety device includes a safety member mounted on the fixing seat and urged on the at least one wheel, so as to adjust a rotation speed of the at least one wheel.    
     
     
         2 . The roller skate in accordance with  claim 1 , wherein the fixing seat is formed with a positioning portion, and the safety member includes an adjusting portion extended through the positioning portion of the fixing seat, a brake portion formed on a first end of the adjusting portion and rested on a rim of the wheel, and a circular adjusting knob formed on a second end of the adjusting portion for rotating the adjusting portion.  
     
     
         3 . The roller skate in accordance with  claim 2 , wherein the positioning portion of the fixing seat is a screw bore.  
     
     
         4 . The roller skate in accordance with  claim 2 , wherein the adjusting portion of the safety member is a threaded rod.  
     
     
         5 . The roller skate in accordance with  claim 2 , wherein the rim of each of the wheels is provided with a rubbing member made of wear-resistant material rested on the brake portion of the safety member.  
     
     
         6 . The roller skate in accordance with  claim 1 , wherein each of the wheels has a plurality of spokes, the fixing seat is formed with a positioning portion, and the safety member includes an adjusting portion extended through the positioning portion of the fixing seat, a passage rod formed on a first end of the adjusting portion and extended through the spokes of the wheel, and a circular adjusting knob formed on a second end of the adjusting portion for rotating the adjusting portion.  
     
     
         7 . The roller skate in accordance with  claim 6 , wherein the passage rod of the safety member is extended through the spokes of the wheel, with the adjusting knob and the passage rod being protruded outward from the wheel and rested on the periphery of the fixing seat, so as to stop movement of the wheel.  
     
     
         8 . The roller skate in accordance with  claim 6 , wherein the safety device further includes a hex wrench extended through the spokes of the wheel, so as to stop movement of the wheel.  
     
     
         9 . The roller skate in accordance with  claim 8 , wherein the fixing seat is formed with a hexagonal recess for receiving the hex wrench.  
     
     
         10 . The roller skate in accordance with  claim 1 , wherein each of the wheels has a plurality of spokes, the fixing seat is formed with a positioning portion, and the safety member includes a passage rod extended through the positioning portion of the fixing seat and the spokes of the wheel, a circular adjusting knob formed on a first end of the passage rod and rested on the fixing seat, and a protruding stop portion formed on a second end of the passage rod and rested on the fixing seat.  
     
     
         11 . The roller skate in accordance with  claim 1 , wherein the fixing seat is formed with a threaded positioning portion formed with two opposite locking holes, the safety device includes a safety member, and an elastic locking member, wherein: 
 the safety member includes a threaded adjusting portion screwed into the positioning portion of the fixing seat, a brake portion formed on a first end of the adjusting portion and rested on a rim of the wheel, and a circular adjusting knob formed on a second end of the adjusting portion for rotating the adjusting portion; and    the locking member is secured on the safety member and has a periphery formed with two opposite locking blocks each locked in a respective one of the two opposite locking holes of the fixing seat.    
     
     
         12 . The roller skate in accordance with  claim 11 , wherein the adjusting knob of the safety member has an inner side formed with a plurality of teeth, and the periphery of the locking member is formed with two opposite oblique elastic plates each having a distal end formed with a locking portion engaged with the teeth of the adjusting knob of the safety member.  
     
     
         13 . The roller skate in accordance with  claim 11 , wherein the elastic locking member is formed with a through hole for passage of the adjusting portion of the safety member.  
     
     
         14 . The roller skate in accordance with  claim 1 , wherein the fixing seat is provided with a threaded positioning portion, and the safety device includes a safety member, and an elastic press member, wherein: 
 the safety member includes a threaded adjusting portion screwed into the positioning portion of the fixing seat, a brake portion formed on a first end of the adjusting portion, and a circular adjusting knob formed on a second end of the adjusting portion for rotating the adjusting portion; and    the press member has a first end secured on the fixing seat and a second end rested on the brake portion of the safety member, the second end of the press member has an inner side formed with a press portion urged on the wheel.    
     
     
         15 . The roller skate in accordance with  claim 14 , wherein the fixing seat is provided with a threaded fixing hole, and the safety device further includes a fixing member extended through the first end of the press member and screwed into the fixing hole of the fixing seat for fixing the first end of the press member on the fixing seat.  
     
     
         16 . The roller skate in accordance with  claim 14 , wherein the positioning portion of the fixing seat is provided with a rubbing member made of wear-resistant material.  
     
     
         17 . The roller skate in accordance with  claim 1 , wherein the fixing seat is provided with a threaded positioning portion, and the safety device includes a safety member, and an elastic press member, wherein: 
 the safety member includes a threaded adjusting portion screwed into the positioning portion of the fixing seat, a positioning portion formed on a first end of the adjusting portion and formed with a threaded pulling bore, and a circular adjusting knob formed on a second end of the adjusting portion for rotating the adjusting portion; and    the press member is connected to the safety member by a threaded pulling member which is extended through a passage of the press member and is screwed into the pulling bore of the safety member.    
     
     
         18 . The roller skate in accordance with  claim 17 , wherein the press member has an inner side formed with a press portion urged on the wheel.  
     
     
         19 . The roller skate in accordance with  claim 17 , wherein the safety device further includes an elastic member mounted on the pulling member and urged between the safety member and the press member.  
     
     
         20 . The roller skate in accordance with  claim 19 , wherein the elastic member has a first end secured on the positioning portion of the safety member and a second end secured on a protruding lug of the press member.