Frame structure for plastic window

Abstract

A frame structure for a plastic window frame structure includes four plastic casings, four steel bushings, and four angled insertion members. The plastic casings are integrally connected with each other by welding to form a rectangular frame. Each of the steel bushings is axially mounted in a respective one of the plastic casings. Each of the insertion members is mounted in the plastic casings and mounted on any two adjacent steel bushings to connect the steel bushings. Thus, the steel bushings are connected by the insertion members, so that the steel bushings are combined integrally, thereby greatly enhancing the structural strength of the frame structure.

1 . A frame structure, comprising four plastic casings, four steel bushings, and four angled insertion members, wherein: 
 the plastic casings are integrally connected with each other by welding to form a rectangular frame;    each of the steel bushings is axially mounted in a respective one of the plastic casings; and    each of the insertion members is mounted in the plastic casings and mounted on any two adjacent steel bushings to connect the steel bushings, so that the steel bushings are combined integrally by the insertion members.    
   
   
       2 . The frame structure in accordance with  claim 1 , wherein each of the insertion members is made of a steel material.  
   
   
       3 . The frame structure in accordance with  claim 1 , wherein each of the insertion members is substantially L-shaped.  
   
   
       4 . The frame structure in accordance with  claim 1 , wherein each of the insertion members is integrally formed with two insertion sections each axially inserted into a respective one of the steel bushings.  
   
   
       5 . The frame structure in accordance with  claim 4 , wherein the insertion sections of each of the insertion members are arranged at a right angle.  
   
   
       6 . The frame structure in accordance with  claim 4 , wherein each of the insertion sections of each of the insertion members has a substantially inverted U-shaped cross-section.  
   
   
       7 . The frame structure in accordance with  claim 1 , wherein the plastic casings, the steel bushings and the insertion members are combined with each other by a plurality of fastening members.  
   
   
       8 . The frame structure in accordance with  claim 7 , wherein each of the fastening members is a screw.  
   
   
       9 . The frame structure in accordance with  claim 7 , wherein each of the fastening members is a bolt.  
   
   
       10 . The frame structure in accordance with  claim 7 , wherein each of the fastening members is a rivet.  
   
   
       11 . The frame structure in accordance with  claim 1 , wherein the plastic casings, the steel bushings and the insertion members are combined with each other by an adhesive.  
   
   
       12 . The frame structure in accordance with  claim 1 , wherein each of the plastic casings has a hollow inside formed with a chamber, and each of the steel bushings is mounted in the chamber of a respective one of the plastic casings.  
   
   
       13 . The frame structure in accordance with  claim 1 , wherein each of the steel bushings has a substantially rectangular cross-section.