Adjustable device for a roller skate

Abstract

An adjustable device for a roller skate includes a base securely engaged with a bottom face of the sole portion, a positioning plate received in the recess of the base, a clamping plate pivotally connected to the positioning plate and a retainer extending to secure connection in the heel portion, the sole portion, the positioning plate and the base. Pivotal movement of the clamping plate toward the heel portion secures the relative position between the heel portion and the sole portion and pivotal movement of the clamping plate away from the heel portion enables the relative position between the heel portion and the sole portion to be slidable.

What is claimed is:  
     
         1 . An adjustable device for a roller skate having a heel portion and a sole portion slidable relative to the heel portion, the adjustable device comprising: 
 a base securely engaged with a bottom face of the sole portion and having a recess defined in a top face of the base, a central through hole centrally defined in a bottom face defining the recess and multiple clamping recesses defined in opposite sides of the bottom face defining the recess;    a positioning plate received in the recess and having multiple extensions formed on opposite sides of the positioning plate to correspond to the clamping recesses arranged on opposite sides in the recess, a hole corresponding to the central through hole of the base and a connection block integrally formed on the positioning plate;    a clamping plate pivotally connected to the positioning plate and having an extension boss formed on a bottom face of the clamping plate for engagement with the heel portion;    a through hole adapted to be defined in a bottom face of the heel portion;    an elongated hole adapted to be defined in a bottom face of the sole portion to correspond to the through hole of the heel portion and the central through hole in the base; and    a retainer extending through the elongated hole of the sole portion, the through hole of the heel portion, the hole of the positioning plate and the central through hole of the base to secure connection in the heel portion, the sole portion, the positioning plate and the base,    whereby pivotal movement of the clamping plate toward the heel portion enables the extension boss of the clamping plate to adapt to be received in a receiving hole in the heel portion and the extensions of the positioning plate to be received in the clamping recesses in the base so that relative position of the heel portion to the sole portion is fixed, and    pivotal movement of the clamping plate away from the heel portion enables the extensions of the positioning plate to be detached from the clamping recesses and thus relative position of the heel portion to the sole portion is slidable.    
     
     
         2 . The slidable device as claimed in  claim 1  further comprising a resilient plate providing a downward force to the positioning plate to maintain the extensions to be received in the clamping recesses in the base.  
     
     
         3 . The adjustable device as claimed in  claim 2 , wherein the resilient plate has a hole defined to correspond to the through hole of the heel portion, the elongated hole of the sole portion and the central through hole of the base so that the retainer is able to extend through the through hole of the heel portion, the elongated hole of the sole portion and the central through hole of the base to secure the connection in the heel portion, the sole portion, the positioning plate and the base.  
     
     
         4 . The adjustable device as claimed in  claim 1 , wherein the retainer is composed of a bolt with an outer threading and a sleeve with an inner threading corresponding to the outer threading of the bolt.  
     
     
         5 . The adjustable device as claimed in  claim 3 , wherein the retainer is composed of a bolt with an outer threading and a sleeve with an inner threading corresponding to the outer threading of the bolt.