Abstract:
A window or a door has a frame structure and a U-shaped bar simultaneously serving as reinforcement section and a turn-tilt mechanism.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention concerns a reinforced window frame consisting of plastic sections and a tilt-turn mechanism. The tilt-turn mechanism is equipped with a sliding bar and with gears, corner diverting mechanisms and a locking tenon. 
     2. Description of the Prior Art 
     Such windows, doors and the like are already known in the art. In a known manner, a reinforcement section is inserted into a plastic hollow section and equipped with an ironwork mechanism screwed into the plastic hollow section. 
     Such an arrangement has the disadvantage that the assembly and installation thereof are very costly and very time consuming. 
     Therefore, an object of the present invention is to provide a window frame that is stable and easy to assemble and install. 
     SUMMARY OF THE INVENTION 
     The advantages associated with the present invention include, in particular, the integration of the reinforcement section and the tilt-turn mechanism into a single unit, thereby avoiding the separate positioning and assembly of the two parts. Thus, the window is easier to install. For window casements of plastic sections with dimensions of up to approximately 1300 mm by 1400 mm, a separate reinforcement section is unnecessary in accordance with the present invention. For larger casement windows, such reinforcement is desirable, because the strength of the window casement, that is, its modulus of elasticity, is insufficient according to the reinforcement guidelines of the plastics industry. 
     The invention is described below in more detail and with the aid of the embodiment illustrated in FIGS. 1 and 2. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Embodiments of the present invention will be described with reference to the accompanying drawing in which: 
     FIG. 1 is a perspective view of an embodiment section of a casement window frame according to the invention and; 
     FIG. 2 is an exploded view of the embodiment casement window shown in FIG. 1. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Those skilled in the art will gain an understanding of the invention from a reading of the following description of the preferred embodiments when read in conjunction with a viewing of the accompanying drawings of FIG. 1. 
     Referring to FIG. 1, there is seen an embodiment section of a casement window frame having a casement section 1, a combined reinforcement section 2, a sliding bar 3 and a locking tenon 3a. The reinforcement section 2 is placed in a channel 1a of the casement section 1 and lies on the contact surfaces 1d of a support section 1c. Support section 1c is approximately H-shaped, and the reinforcement section is held in place by two projections 1b. 
     Referring to FIG. 2, there is seen an exploded view of the embodiment casement window frame shown in FIG. 1. The locking tenon 3a is engageable with a mating member 6a, which secured to a casement 5 by a screw 4. The slider bar 3 and locking tenon 3a are movable along the length of reinforcement piece 2 in the direction indicated by the arrow. The slider bar 3 and locking tenon 3a thereby cause tilting and turning of casement 5 as is well known in the art. 
     The slider bar 3 of the tilt-turn mechanism runs below the cross leg 2a of the reinforcement section 2 but within the H-shaped support section 1c. The locking tenon 3a of the tilt-turn mechanism projects from the slider bar 3 into a mortise 2b, or lengthwise recess, of the reinforcement section 2. A fastening device 4, which may be, for example, a screw, fastens reinforcement section 2 and casement section 1. If sliding bar 3 moves below the cross leg 2a of the reinforcement section 2, the locking tenon 3a attached to the sliding bar 3 and the tilt-turn mechanism of the window frame are shifted either into the active or the rest position. 
     The window frame of the present invention has the necessary strength and is assembled in a simple manner with all of the desirable and required features of such a window. Naturally, the invention is not limited to the embodiment casement window frame consisting of plastic hollow sections as described above. The invention may also be successfully used in window frames consisting of other materials, such as wood, metal or some other combination of materials. 
     Accordingly, the several aforementioned objects and advantages are most effectively attained. Although a single preferred embodiment of the invention has been disclosed and described in detail herein, it should be understood that this invention is in no sense limited thereby and its scope is to be determined by that of the appended claims.