Abstract:
A reinforcing block for a closure tilt latch, comprising a body fastened in a closure track fastened to a frame, said body having a top and bottom and having a locking detent extending therein said locking detent providing a vertical face extending toward said top of said body from intermediate said top and bottom, the tilt latch being compatible with the vertical face of said locking detent, wherein when said latch engages said detent said block provides a reinforcement path to the closure frame to strengthen the loading capability of said closure and to reduce the risk of the latch from disengaging said track under loading which track would be subject to distortion had the block not been utilized.

Description:
This is a division of application No. 08/962,263 filed Oct. 31, 1997. This application is a continuation in part of U.S. patent application Ser. No. 08/362,995 filed Dec. 23, 1994 now U.S. Pat. No. 5,687,506 which is a continuation in part of U.S. patent application Ser. No. 08/281,620 filed Jul. 28, 1994 from which priority is claimed now U.S. Pat. No. 5,682,710. 
    
    
     FIELD OF INVENTION 
     This invention relates to a retractable screen system for a closure assembly and improvements thereof which allows the secure sliding and subsequent retraction of the screen from a operative position to a retracted position. The invention is preferably embodied in a window assembly but finds application also in large pivoting windows and patio doors. 
     BACKGROUND OF THE INVENTION 
     The reader is referred to Applicants Co-pending Applications abovementioned for teachings in relation to improvements to closure assemblies, the teachings thereof which are hereby incorporated by reference. 
     Screens are generally provided for doors, patio doors, and windows. One particular type of screen utilized for patio doors for example, includes a metal frame having a groove disposed around its edges. The screen is affixed to the frame by using a spline, a long extended piece of flexible material, which is forced into the groove capturing the edges of the screen. The screen is then slid in front of the opening when the patio door is moved to an opened position. The screen therefore permanently blocks the view of the occupant of the dwelling. The same is true for screens provided with double-hung windows, tilt and slide windows, and casement windows. The screen generally is always in position whether the window is opened or closed. 
     Various examples therefore have been developed by inventors to address this problem. 
     For example, U.S. Pat. No. 5,505,244 to Thumann describes a retractable covering for a door including a housing containing a roll of screen as best seen in FIGS. 2,  5 ,  6 A and  6 B thereof. The cover may be affixed to a door adjacent the frame thereof as an after-market product. 
     Another example of an after-market type of product is found in U.S. Pat. No. 4,821,786 as best seen in relation to FIG. 6 therein, the structure is adapted to be mounted on one side of a door jamb to be releaseably connected to the other. The assembly is quite complicated and complex and may be considered as an add-on structure. 
     Similarly, U.S. Pat. No. 3,911,990 provides a screen in combination with a sliding door. The screen is disposed upon a spring-loaded roller installed on the exterior of the framing sections of the opening adjacent to the window frame. 
     U.S. Pat. No. 4,757,852 describes a box-like housing carrying a tube for paying out and taking up a mesh screen. The housing is fastened over a window or door and is not part of the framing section of the door. 
     U.S. Pat. No. 4,651,797 describes a roll-up screen door included in a narrow housing containing a conventional spring-biased roll onto which flexible screen material is taken up and paid out. The housing is mounted adjacent one side of a vertical curved strip along one side of the door casement opening. The front vertical edge portion of the screen material is anchored within a vertical groove of the anchoring strip as best seen in FIGS. 3 and 5. Again, the housing extends from the framing section and is not part thereof. A more complex arrangement is found in U.S. Pat. Nos. 4,359,081 and 4,261,524. 
     Referring now to U.S. Pat. No. 1,150,000 to Matthews, there is described a window screen coiled on a roller for installation on a window frame. The roller for the window is illustrated in FIG. 5 including a hook portion for hooking a complementary hook portion on the screen. The other edge of the screen includes a hook portion for engaging with the trim portion  34 . 
     U.S. Pat. No. 1,141,996 to Vanasdale describes another type of roller screen which may be attached to the sill or lintel portion of the frame by mounting brackets as best seen in relation to FIGS. 1 through 6. 
     None of the above-mentioned references teach or even infer the installation of a screen within the framing sections of a closure assembly such as a jamb. Each of the products may be considered as an after-market product which is installed upon, adjacent to, on or butting up against the framing section of the appropriate closure member. In essence, some of the installations are unsightly with a housing extending from the general plane of the home or window, extending either outwardly away from or inwardly toward the interior being closed by the closure member. It would therefore be advantageous to solve this problem by providing a screen assembly which may be contained within the framing sections of a closure assembly and which retracts into the frame member and which is substantially invisible until such time as needed. 
     U.S. Pat. No. 4,825,921 describes a screen assembly having supporting elements secured along the edge of the material as best seen in relation to FIGS. 4 and 7. The structure also includes a spring-biased element which rides in a track. As best seen in FIGS. 9 through 11, the screen is considered to be an add-on, after-market device as well. 
     U.S. Pat. No. 3,842,890 to Kramer describes a coilable closure device as best seen in FIGS. 1 and 18 which includes a frame including a side jamb and a storage jamb,  34  and  36  respectively. The coilable closure device does not include a post and includes a multiplicity of sections as best seen in FIGS. 1 and 6 which sections include elements extending up into and down into respective track areas provided with the frame. The material which coils upon itself is particularly plastic sheet including reinforcing ribs which also act as guiding elements for the sheet. However, nowhere within the reference does it teach the use of such a structure for a screen, but merely as a closure to replace a door between adjacent rooms, for example. Nowhere within the reference does it teach the combination of a closure member such as a window or patio door and a screen. This is simply not described. Therefore, one would not be motivated to solve the problem of combinations of closure members and screens by the reading of the Kramer reference. 
     Nowhere therefore within the prior art is there taught improvements to screen assemblies, wherein the entire screen assembly is contained within the framing sections found adjacent to a closure member in a closure assembly, for example a window assembly. Further, nowhere within the art is there found a roll-out screen assembly embodied in a cassette which may be readily inserted within the hollow of a framing section sized to receive said cassette or screen assembly. Further, nowhere in the prior art is there manufactured a screen having an abutment on one edge thereof for engaging with a cooperative abutment on the roller of a screen assembly which may be cut to size as desired to repair a roller screen assembly. Further, nowhere within the prior art is there found various improvements to roll-up screen assemblies to simplify their installation, adjustment and replacement. 
     Nowhere within the prior art is such a simplified improved screen assembly provided which retracts into the jamb, sill or header of the frame portion of a window assembly in the retracted position and which is preferably guided to its operative position in guides provided with the jamb, sill or header, and which allows for the manufacture of heavier screens in larger sections without continuously covering of the window. 
     It is therefore an object of this invention to overcome many of the deficiencies in the prior art stated above which allows for smooth and simple operation of a retractable screen which is capable of both sliding within a guide channel between the retracted and the operative positions and which at the retracted position is fully contained within the jamb, sill or header section of the closure assembly. 
     It is a further object of the invention to provide a retractable screen assembly of appropriate size and construction to replace existing retractable screen assemblies for casement, double hung and/or tilt and slide windows as well as patio doors. 
     It is further a primary object of this invention to provide a roll-up screen embodied in the frame of a closure assembly which is retractable into the frame itself without requiring an additional housing. 
     It is a further object of the invention to provide a roll-up screen assembly in the form of a cassette which may be mounted within the hollow of a framing section, which cassette includes a front facia portion to close the framing section. 
     It is yet a further object of this invention to provide a continuous roll of screen manufactured so as to be cut at a predetermined width and include an anchoring element disposed adjacent one edge of the screen so as to allow ease of installation of the original or replacement screen. 
     It is yet a further object of the invention to provide a method of manufacturing a screen. 
     It is yet a further object of the invention to provide a cassette which may be side mounted into an opening of the framing section and closed by an exterior facia element. 
     It is yet a further object of the invention to provide a closure assembly including a roll-up screen contained with one of its framing sections adjacent the closure member. 
     It is yet a further object of the invention to provide improvements in mounting brackets, facia elements, and screens. 
     Further and other objects of this invention will become apparent to a man skilled in the art when considering the following summary of the invention and the more detailed description of the preferred embodiments illustrated herein. 
     SUMMARY OF THE INVENTION 
     This invention relates to a retractable screen system for a closure assembly and improvements thereof which allows the secure sliding and subsequent retraction of the screen from a operative position to a retracted position. The invention is preferably embodied in a window assembly but finds application also in large pivoting windows and patio doors. The closure member may further comprise a window sash being a casement, double hung, or tilt and slide installation or, a door or a patio door. 
     There is therefore provided improvements to screen assemblies, wherein the entire screen assembly is contained within the framing sections found adjacent to a closure member in a closure assembly, for example a window assembly. Further a roll-out screen assembly is embodied in a cassette which may be readily inserted within the hollow of a framing section sized to receive said cassette or screen assembly. The screen has an abutment on one edge thereof for engaging with a cooperative abutment on the roller of a screen assembly which may be cut to size as desired to repair a roller screen assembly which simplifies their installation, adjustment and replacement. 
     There is also provided a simplified improved screen assembly which retracts into the jamb, sill or header of the frame portion of a window assembly in the retracted position and which is preferably guided to its operative position in guides provided with the jamb, sill or header, and which allows for the manufacture of heavier screens in larger sections without continuously covering of the window. 
     In a tilt and slide, casement or double hung window a retractable screen is provided disposed within the header, sill or jamb of the assembly which screen accumulates on and pays out from a spring biased roll disposed within said header, sill or jamb, the screen being retractable for egress or cleaning purposes, and available as desired by providing a detent on the opposing framing member engageable with a detent provided with the screen when in its operable position. 
     According to yet another aspect of the invention there is provided a window assembly comprising a retractable screen disposed within a framing portion of the assembly, the screen accumulating on and paying out from a spring biased roll disposed within said frame portion, the screen being retractable for egress or cleaning purposes, and available as desired by providing a detent on the opposite frame portion engageable with the screen when in its operable position. 
     According to yet another aspect of the invention there is provided a closure assembly comprising a retractable screen disposed within a framing portion of the assembly, said framing portion providing a pocket within which the screen is contained in use, said pocket being bound by three sides of said framing portion thereby forming said pocket, said pocket being closed by a separate cover closing said framing portion, preferably said retractable screen being mounted on said cover and being positioned in said pocket when the cover closing the pocket is installed preferably by clipping a detent provided with said cover in a channel provided with one of the sides of said framing portion providing the pocket, the screen accumulating on and paying out from a spring biased roll disposed within said frame portion, the screen being retractable for egress or cleaning purposes, and available as desired by providing a detent on the opposite frame portion engageable with the screen when in its operable position. 
     According to yet another aspect of the invention there is provided a continuous screen formed as a continuous web and adapted to be utilized for a retractable screen for windows, doors and the like having a predetermined width of screen determined by the width or length of the closure member frame, said width of said screen having two ends, preferably each of the ends having an anchor or key shaped element fixed thereto adapted to engage a detent on a handle proximate one end of the screen and adapted to engage a detent of a preferably spring biased, preferably hollow, roller utilized for taking up and letting out the screen in a coil upon said roller, alternatively the handle end of the screen alternatively having a tape or continuous strip of adhesive applied thereto so as to engage and be captured by a handle portion of said screen when utilized in a closure assembly, said screen and said anchor or key shaped elements being cut at a predetermined length to fit said roller when assembled and being installed with said closure assembly and preferably within a hollow of one of said frame sections, wherein said screen may be utilized as an original installation or as a replacement screen for an original installation. 
     According to yet another aspect of the invention, there is provided a retractable screen assembly for a closure assembly, said closure assembly including a closure member surrounded by framing portions from which the closure member is supported, said closure member including framing sections, one of said framing sections providing a pocket within which said screen assembly is retained in use, said screen assembly comprising a cassette engageable with the interior of a cover utilized for closing the framing portion and pocket of the closure assembly, preferably said pocket being located proximate the sealing end of the closure member, said retractable screen including a handle portion affixed thereto including a first detent, the opposite jamb from said pocket including a latching portion including a second detent which engages the first detent of the handle portion when the screen is in the fully open position, wherein said cassette may be installed within any convenient pocket disposed within the framing portions of a closure assembly and fixed in position once the cover covering the pocket is installed. In a preferred embodiment, brackets are provided having channels which capture preferably T-shaped guides on the interior of said cover which allow for the fixing of the brackets in relation to the specific screen assembly being installed, said screen assembly also including a hollow tube to which said screen is anchored via a detent on the tube and via a detent on one end of said screen, the other end of said screen including another detent for engaging with the detent of a handle portion of said assembly, said tube having inserted within the ends thereof a pin assembly which will not rotate in relation to said tube as a result of rib portions disposed with said assembly engaging rib portions disposed within the hollow of said tube, each of said pin assemblies including a pin for engaging a pin-receiving opening disposed with each of said brackets, wherein said brackets may be fixed with respect to the interior of said cover thereby fixing the entire screen assembly as a cassette, one of said brackets being adjustable in relation to said torque tube in order to allow for adjustment and variations from installation to installation, preferably said handle portion including telescoping guides which capture the ends of said screen and are retained within a hollow within said handle, said guides for riding within a channel disposed with opposite or opposing framing sections to guide the screen across the opening defined by said closure member when desired. In an alternative embodiment, the brackets may include a box-like element which rests at the bottom of a framing section and being locked in position because of the compatible dimension of the bracket with the framing section and adjustable in position in relation to that bottom in order to provide for variations in manufacturing. 
     According to yet another aspect of the invention, there is provided a method of assembling a retractable screen cassette comprising: 
     (1) providing a tube upon which said screen will coil up in use, 
     (2) providing a pin assembly insertable into the open ends of said hollow tube and being prevented from rotating with respect to said tube as ribs disposed with said tube, engaged ribs disposed with said pin assembly, 
     (3) providing a torsion spring having ends which are engageable with said pin assembly ends for providing the correct torsion and tensioning of said spring, 
     (4) inserting said spring within the hollow tube and inserting said pin assemblies within said hollow tube and fixing the ends of said pin assemblies to the tyne portions of said torsion spring, 
     (5) providing brackets from which said pin assemblies will be adjustably inserted, said brackets being locked in place with respect to the assembly, preferably either by engaging with a detent provided with a flexible cover or alternatively by engaging with the bottom of the framing section, 
     (6) adjusting said brackets in relation to the distance from one another so as to correctly tension and carry the screen assembly, 
     (7) fixing said screen on said screen assembly by anchoring said screen to said tube via a detent, preferably a T-shaped detent or key for engaging with a key slot on the tube or alternatively by using welding or adhesive, and coiling said screen upon said tube, 
     (8) fixing said opposite end of said screen to a handle portion either preferably by a T-shaped detent engaging a T-shaped detent with said handle, or by welding or an adhesive, 
     (9) coiling said screen upon said tube, 
     (10) preferably engaging said cover portion with said brackets, 
     (11) inserting said screen assembly within a pocket of said closure assembly in one of the framing portions thereof, 
     (12) covering said pocket with a flexible cover. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a schematic perspective view of a tilt and slide window, wherein said windows move in a horizontal direction, illustrated in a preferred embodiment of the invention. 
     FIGS. 1A and 1B are partial schematic perspective views of casement style windows embodying the invention and depicting the motion thereof and illustrated in a preferred embodiment of the invention. 
     FIG. 1C is a partial schematic perspective view of straight line windows embodying the invention and depicting the motion thereof and illustrated in a preferred embodiment of the invention. 
     FIG. 1D is a partial cutaway view of the casement style windows of FIG. 1A depicting a rollaway screen thereof and illustrated in a preferred embodiment of the invention. 
     FIG. 2 is a front view of the window of FIG.  1 . 
     FIG. 2 a  is a top view of the window of FIG.  1 . 
     FIG. 2 b  is a end view of the window of FIG.  1 . 
     FIG. 3 is a double hung window assembly utilizing hardware similar to that of FIG.  1  and illustrated in a preferred embodiment of the invention. 
     FIG. 4 is a perspective illustration of the hardware only for a double hung window of FIG.  3 . 
     FIG. 5 is an exploded perspective view of the components of the hardware of FIG. 4 to be installed in a double hung window assembly. 
     FIG. 6 is a carrier design illustrated in a preferred embodiment of the invention which allows for ease of removal of a window from a window assembly and illustrated in an exploded perspective view. 
     FIG. 7 is an assembled view of the components of FIG.  6 . 
     FIG. 8 is a tilt and slide window assembly primarily for the hardware therefore and illustrated in an alternative embodiment of the invention. 
     FIG. 9 is a schematic view of the movement of the shoes of FIG. 8 illustrated in alternative of the invention. 
     FIG. 10 is a perspective illustration of a pulley arrangement installed at the corners of the window assembly of FIG.  8  and illustrated in alternative embodiment of the invention. 
     FIG. 11 is a close-up perspective view of a locking mechanism for the shaft assembly  30  illustrated in a preferred embodiment of the invention. 
     FIG. 12 is an end view of the locking mechanism of FIG. 11 illustrated in a preferred embodiment of the invention. 
     FIG. 13 is an end view of a locking block assembly illustrated in a preferred embodiment of the invention. 
     FIG. 13A is an end view of the track profile used in conjunction with the lock block assembly of FIG.  13  and illustrated in a preferred embodiment of the invention. 
     FIG. 13B is a top schematic view of the lock block assembly of FIG. 13 shown engaging the rack portion of the track and illustrated in a preferred embodiment of the invention. 
     FIG. 13C is a side cross-sectional view of the adjusting cap screw used to adjust the track within the sill or header or jamb portions and illustrated in a preferred embodiment of the invention. 
     FIG. 14 is a top view of the carrier for the shaft assembly of FIG.  17  and illustrated in a preferred embodiment of the invention. 
     FIG. 14A is a cross-sectional view through the diameter of the opening  35   b  of FIG. 14 illustrated in a preferred embodiment of the invention. 
     FIG. 15 is an top end view of the sash portions for a tilt and slide window assembly from the opening end of the window and illustrated in a preferred embodiment of the invention. 
     FIG. 15A is a close up view of the section of the assembly of FIG. 15 where the sash abuts with the sill and illustrated in a preferred embodiment of the invention. 
     FIG. 16 is a schematic end view of a central locking system best seen in FIG.  17  and illustrated in a preferred embodiment of the invention. 
     FIG. 16A is an end view of the central locking system of FIG.  16 . 
     FIG. 16B specifically illustrates the latching plate and latch of the central locking system and illustrated in a preferred embodiment of the invention. 
     FIG. 17 is an exploded perspective view of a window sash for a tilt and slide or casement window illustrated in a preferred embodiment of the invention. 
     FIG. 18 is an exploded perspective view of the header, sill and jamb portions of the window assembly illustrating the track and its positioning in relation to the sill and header and illustrated in a preferred embodiment of the invention. 
     FIG. 19 is an exploded perspective view of a retractable screen assembly illustrated in one embodiment of the invention. 
     FIG. 20 is a similar view to that of FIG. 19 illustrating another embodiment of the invention. 
     FIG. 21 is a cross-sectional view of a frame portion containing the retractable screen illustrated in a preferred embodiment of the invention. 
     FIG. 22 is a schematic view of a screen manufactured in another embodiment of the invention illustrated in a preferred embodiment of the invention. 
     FIG. 23 is a schematic view of the installation of the screen of FIG. 22 in a retractable screen assembly and illustrated in a preferred embodiment of the invention. 
     FIG. 24 is a cross-sectional view of the hollow tube upon which the screen is rolled up and illustrated in one embodiment of the invention. 
     FIGS. 25A and 25B are side and end views of the pin assembly shown in FIG.  19  and illustrated in a preferred embodiment of the invention. 
     FIGS. 26A and 26B are side and end views of the slide illustrated in FIG.  19  and shown here in a preferred embodiment of the invention. 
     FIGS. 27A and 27B are side and end views of the bushing of FIG. 19 illustrated herein in a preferred embodiment of the invention. 
     FIGS. 28A through 28C are top end and side views of the mounting bracket of FIG. 19 illustrated in a preferred embodiment of the invention. 
     FIGS. 29A through 29C are side, top and end views of the guide portion illustrated in FIG.  19  and shown here in a preferred embodiment of the invention. 
     FIG. 30 is an end view of the screen handle illustrated in FIG.  19  and shown here in a preferred embodiment of the invention. 
     FIGS. 31A and 31B are top and side views of the screen lock illustrated in FIG.  19  and shown here in a preferred embodiment of the invention. 
     FIGS. 32A and 32B are top and side views of the latching plate of FIG.  19  and shown here in a preferred embodiment of the invention. 
     FIG. 33 is an end view of the sealing block shown in FIG.  19  and illustrated here in a preferred embodiment of the invention. 
     FIG. 34 is a side view of the cover portion for the jamb section of FIG.  21  and illustrated in a preferred embodiment of the invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring now to FIG. 1,  2  through  2   b  there is illustrated a tilt and slide window assembly. Therefore the assembly  5  includes an outer frame portion  10  which is normally hung within an opening established in a building (not shown). Normally nailing flanges are provided for this purpose attached to the outer frame  10 . The frame  10  includes top portions  17  and bottom portions  16  having tracks disposed therein, as best seen in relation to FIG.  2 . Within the tracks are contained a pivot assembly which will be hereinafter described. Primarily the pivot assembly includes a pinion  35  and carriers  38  and  37  interconnected by interconnecting portions  32  and  31  making up an interconnecting member  30 . The pinions move as the window  20  is slide in the track portion by the movement of the pinion  35  with respect to the rack  18  or  19  respectively. In this way the pinions  35  being interconnected remain parallel at all times in their motion along the track within which the rack  19  or  18  is disposed. The hardware is shown in normal view while the window assembly is shown in dotted lines, to illustrate the essence of the assembly. 
     Referring now to FIG. 2 there is illustrated the window of FIG. 1, wherein a window  20  and  40  is slidable within a track  15  and  17  upon a shoe  39 . The lower shoe  39  also is connected to a secondary show  39   a  for carrying the window which includes rollers  39   b ,  39   a   1  and  39   b   2  on the bottoms thereof respectively for ease of movement within track  17 . The pinion  35  rests within the shoe  39  as will be described hereinafter. The arrangement of the interconnecting portion  30  will also be described hereinafter. Window  40  therefore has its own interconnected system as can be best seen in relation to FIGS. 2 a  and  2   b.    
     Referring now to FIG. 2 a  there is illustrated the sash elements  20  and  40  and the rack portions  19  and  19   a  which accommodate the motion of the pinion  35  along a full length of the track, as best in FIG. 2 b.    
     Referring to FIGS. 1,  2  to  2   b  clearly the track portion  17  and  15  cooperate with the rack portions  19  and  19   a  to provide for the pinion  35  and its motion when the window remain slidable within the track. By interconnecting the two pinion portions and hence the two pivot shoes, by interconnecting means  30 , the shoes remain in a substantially parallel position in relation to one another at all times. This overcomes the problem described in the background of the prior art. By remaining parallel it is almost impossible for the window therefore to come out of the track when the window is pivoted to be cleaned and therefore is no longer necessary to provide braking portions as in previously described inventions of Canadian Thermo Windows, as referred to in the background of the invention. 
     Referring to FIGS. 1A and 1B there is illustrated a casement style window having similar components to that found in relation to FIG. 1 with the exception of only one sash being provided being secured on shaft assembly  30  including portions  31  and  32 . A link L is provided secured proximate ends L 1  adjacent the center of the sash  21  proximate the bottom thereof and adjacent the track  18  adjacent the opening end of the window sash  21 . By positioning the sash in this manner a full range of pivoting motion is available. If the link end L 1  is removable than the window sash may be moved totally to the opposite end remote the pivoting end  21   b  on shoe  39 . As with the case of the tilt and slide window a shoe  39  containing a pinion is provided. The pinion is connected to the shaft  30  and engages the rack  18  as it moves along the window sill and header in parallel arrangement between the upper and lower pivots maintained in parallel by the shaft  30 . In this manner the casement style window may be pivoted as normal to an open position, and the pivoting end may be moved to the other end of the window frame away from side  21   b  to allow ease of cleaning. By supplying the hardware described without a casement sash the casement window may be assembled without the need for expensive pivots and linkages and without a great deal of assembly labour. As best seen in FIG. 1D for the casement style window in particular a rollaway screen S may be provided which is housed in jamb  17   a  as illustrated. The screen S pulls across to engage detent D 1  with detent D 2  in jamb  16   a , whereat it may be locked. This allows a user to clean the glass of sash  21  on the inside without removing the screen. 
     Referring to FIG. 1C there is illustrated a tilt and slide type window similar to FIG. 1 with the exception that when closed the window sashes will be oriented in a straight parallel line with one another. In order for this to happen the rack provided  18  includes a portion  18   a  made from fiber filled plastic or the like and joined at seam  18   c  to an aluminum track  18   b . The sash  21  is therefore moveable as previously described on carrier  39  and rollers  39   a  as urged by pinion  35  until the pinion reaches the curved portion of the track  18  a wherein the assembly  30  will move along the curve to the terminus of the track  18   t . The sash portion  21   a  will then lock in behind the edge of the sash contained in track  18 ′ and be lockable at that position. The sash  21 ′(not shown) resides on assembly  30 ′ in track  18 ′. As pinion  35 ′ moves within the limits of rack  18 ′ the sash  21  cannot adopt a parallel position unless sash  21 ′ is in its fully closed position. Only then can the end  21   a  adopt its fully closed position butting up against the sash  21 ′ at the end opposite the carrier assembly  30  and  39 . 
     Referring to FIG. 3 there is illustrated a double hung window assembly embodying the preferred embodiment of the hardware making up the invention substantially equal to that which is disclosed in FIG. 1, with the exception that a coil spring  31   a  is provided around the connector portion  31  of the interconnecting portion  30 . By providing the interconnecting portion  31  with a spring  31   a  it will no longer be necessary in a double hung window assembly to provide a sash balance, as the spring  31   a  is pre-loaded to provide the necessary tension, much the same as a spring which is used in a garage door. In this example as a garage door goes up and down the spring is compressed and tensioned depending on the motion of the door and therefore provides for the return motion of the window assembly. Within the window assembly sashes  20  and  40  shown in ghost line are moveable with hardware substantially made up of a pivot or pinion  35  moving on a rack  18  and  19  respectively and being interconnected by the interconnecting portion  30 . 
     Referring to FIGS. 4 and 5 there is illustrated the hardware which is installed within the double hung window assembly of FIG.  3 . Pinions  35  therefore are provided, which seat within the carriers or shoes  39 . The pinion includes a shaped opening  35   a  which is compatible with the bar stock  34   c  and  32   a  proximate the ends thereof. The pinion therefore will ride on the rack  18  and  19  within shoe  39 . Opposed supplementary portion  37  is provided to oppose the shoe  39  as it rides in the track. Therefore, referring to FIG. 2 b  the portion  37  and  38  may be readily seen. A combined ratchet and pawl assembly is provided with portion  37  or at least connected therewith. The pawl assembly  37   c  is resilient biased through the opening  37   d  of member  37  so as to release the ratchet  34   b  of shaft  34  when the window is to be removed from the assembly. Proximate the other end of the hardware there is provided a backing member  38  in a unique shaft extension  33  which includes portions  33   b ,  33   d ,  33   c  and  33   a  wherein the shaft end  32   a  extends through. A locking nut  33   e  is provided to lock the entire hardware together and to allow for ease of separation thereof. An adjustable connector  31   b  is provided proximate the other end which allows for adjustment with regard to the length of section  32  of the shaft so as to allow variation in the sizes of the assembly supported. Portions  31 ,  31   b ,  32 , and  33  makeup the shaft assembly which allows for ease of installation, adjustment, alignment and removal of the sash assembly. Also the hardware therefore described provides for the interconnection of the pivot shoes proximate their sides and provides for parallel motion of the pivot shoes at all times thereby illuminating the need to lock the pivot shoes in the track assembly. 
     Referring to FIG. 6 there is a description of a different shoe construction which is useful when a window is removed, since the carrier will be locked in position when the window is removed for maintenance or for cleaning. Therefore the shoe  39  includes a spring b and a recess therefor and a supplementary portion  39   d  and a finger a therefore wherein teeth c are provided on supplementary portion  39   d  which teeth are biased by spring b against the pinion  35  to thereby lock against pinion  35  and prevent the motion of the carrier when the window is removed. A sloped wall d is provided with the carrier supplementary portion  39   d  which is engaged by a separate simple latching and unlatching mechanism which thereby releases the supplementary portion away from the pinion or toward the pinion when the latch is opened. Therefore when the latch engages the supplementary portion d it will drive the supplementary portion  39   d  away from the pinion  35  thereby allowing free motion of the pinion in normal circumstances. However when the latch is disengaged the portion  39   d  will be free to move as biased by the spring b toward locking the pinion  35  via the teeth c of the supplementary portion  39   d . The alternate shoe of FIGS. 6 and 7 has an opening  39   a  within which the extension  35   a  passes to engage the connecting member  30  as previously described. The rollers  39   b  engage with the notches as shown to improve the motion of the carrier in the track. 
     Referring now to FIGS. 8,  9  and  10  there is illustrated an alternative embodiment of the invention to maintain the carrier pivots  61 ,  65 ,  60  and  81  in substantially parallel alignment and thereby eliminate the need for braking mechanisms. FIG. 8 is illustrated as a tilt and slide frame in ghost line with the window  70  also shown in ghost line having pivot  75  and  71 . The pivots  75  and  71  engage with openings within the shoe  61  and  65  in the manner which is known. These pivot pins  75  and  71  may be removed from these shoes merely by retracting them from their locked positions. The sash  70  therefore is moved on the carrier  81 ,  82  and  83  proximate the bottom thereof in the track portions as shown and within carrier  60  on the top thereof. A similar sash arrangement would be arranged for the other shoes as well but for simplicity sake this is not illustrated. The important aspect is that a cable  91  is connected to the carrier  60  and the carrier assembly  81 ,  82  and  83  substantially as shown in FIG. 9, so that when the window moves toward the right hand side of the drawing that both carriers will move an equal amount by the movement of the cable maintaining the pivots  75  and  71  within the shoes  60  and  81  substantially parallel at all times. Similarly, a cable  90  is provided which moves in conjunction with the carrier  63 ,  62  and  61  and the shoe  65 , as best seen in FIG. 9, so that as the shoe  65  is moved in a direction D 2  that the carrier  61 ,  62  and  63  will also be moved in the direction D 2 . FIG. 9 therefore shows the path of the cable connecting the carrier described above. 
     In order to allow for the movement of the cable the unique pulley arrangement is illustrated in FIG. 10 wherein the cable will travel through the respective channels  107 ,  108  and  105   a  within the wheel  105 , or through  106 ,  104 ,  105   a  within the opposite wheel or pulley  105 . Assembly  101  is therefore provided which is affixed within the window frame via opening  101   a  and a fastener, not shown, which assembly allows for the movement of the cable and hence the carriers in a manner as best seen in FIG.  9 . 
     Referring now to FIGS. 11 and 12 there is provided a locking mechanism for the shaft  30  which may be used with any lousier assembly. A handle assembly H is provided including a stationary portion H 2  fixed to the sash  21  and a moveable spring biased portion H 1  biased to a continual locked position via spring leaf S 2 . The handle portion H 1  includes a pivot H 4  and detent portions H 5  and H 6 . Normally the spring S 2  will cause the handle portion H 1  to remain in engagement at detents H 5  and H 6  with gear portion or serrations  30 Z of the shaft  30 . Therefore the window or door is locked in that position and cannot be pivoted or slid. When a user engages the handle H 1  and presses it towards H 2  the detents H 5  and H 6  release from the gears  30 Z and hence the window or door may be repositioned as desired. At that repositioned location when the user releases the handles the window or door will again become locked. 
     Referring now to FIGS. 13,  13   a ,  13   b ,  13   c  and FIG. 18, there is illustrated a track portion  18  and  19  which is to be installed within, as shown in FIG. 18, the sill and header  220  of a frame assembly also including upwardly extending jamb portions  220   a . The track portions  18  and  19  therefore are installed within the profiles as seen in FIGS. 2 b  and  18  by the provision of a locking block assembly  200  which includes an adjuster nut  210  which engages the rack portion  18   x  of the rack  18   a  of the track profile  18  as best seen in FIG. 13 a . The profile therefore includes the rack  18   a , a riding portion for the rollers  18   e  which will be explained hereinafter, and a recess  18   d  wherein a carrier as best seen in relation to FIG. 14 rides with the exception of the rollers. The track  18  therefore must be locked in position in the sash  220 , and this is affected by the locking block  200  and the moveable nut  210 . As best seen in FIG. 13 c , the track is inserted into the sill profile as shown so that the carrier may ride on the track. The assembly of FIG. 17 for the sash is therefore engaged with the carrier. The block  200  therefore is screwed down through the profile  15  into the wooden frame member not shown via opening  15   c  in the profile and  204  in the block  200 . Two fasteners  205  therefore are provided, and as shown in FIG. 13, they are inclined at an angle to the vertical in order to allow for the provision of an adjuster  206  which is accessible through-the opening  207  in the block  200  wherein a cap screw having a head  206   a  having an allen key type access slot is provided. The threading  207   b  extends down to the end  207   a  proximate the nut  210 . 
     As best seen in FIG. 13, the lock block  200  and the locking nut  210  have a profile substantially as shown with a triangular shaped cut out provided adjacent the top thereof and wherein abutting portions  201  and  203  are provided to engage with the flanges  15   b  and  15   a  of the profile  15  of the sill portion  220 . The triangular cut-out portion includes an upwardly vertical face  202   a , and bottom  202 . Similarly the nut has a shoulder  211  provided and a substantially triangular shaped cut out  212  and an upwardly extending face  212   a  for engaging with the sill profile  15  similar to that which is illustrated and described in relation to FIG.  13 . The rotation therefore of the cap screw  206  results in the movement of the nut  210  in relation to the block  200  which is fastened in position. The adjustment therefore of the screw allows for the thread to engage a threaded opening not shown in the nut  210  so that the rack portions  213   a  provide engagement with the rack  18   a  of the track portion  18  and will allow for fine adjustment in the positioning of the track  18  and the locking in position of the track. It has been found sufficient that by providing the block and the adjustment of the nut, it will sufficiently position and lock the track in position and allow for the adjustment of the track which will then further allow for the adjustment of the pivots as best seen in FIGS. 1,  1   a ,  1   b ,  1   c , FIG. 2, FIG.  3  and FIG. 17 so that the parallelism is not lost, and if fine adjustments once installed are required to the window sash to maintain the parallelism of the system, this is very easy to do. Should the system go out of parallel and require fine adjustment to restore the parallelism, a mere rotation of the head  207  is required for both the sill and headers  220  so that the system is squared. 
     The notch portion defined by the faces  202   a  and  202  have a unique purpose in that the latch portion  251  as well as  250 , as best seen in FIG. 17, will engage with the face  202   a  and provide a lock detent for the lock  251 . This adds reinforcement to the lock provided in that should the triangular shaped detent of the block not be provided, then the lock  251  would engage flange  15   a  and in time would wear out that flange in that particular locking position. The nut  210  has a similar function so that either the nut or the block can function as the detent for the latch. Specifically in FIG. 18, the screw  206  is shown being engageable from the nut toward the block, and in fact it is accessible in either direction as shown in FIG.  13  and FIG. 18 without changing the advantages of the system. For access purposes, depending on the installation and the type of window, it may be easier to adjust as shown in FIG. 18 as opposed to FIG.  13 . Preferably the block is made from fiber-filled nylon. Alternatively, the block may be made from aluminum. The nut may be made from fiber-filled nylon as well. 
     Referring to FIGS. 14,  14   a  and  18 , there is illustrated a carrier  39   x  which includes a pivot portion  35  for engaging with the shaft portion  32  and  34   c  of the pivot assembly and for carrying that shaft assembly and the pivoting end of the sash in the track  18  and  19  respectively of FIG.  18 . The carrier includes a portion  39   y  provided therewith to carry the rollers  39   b  therein. This is very similar to the carrier illustrated and described in the previous descriptions and more specifically in relation to FIGS. 1 a  and  1   b,  with the exception that the details of the carrier were not shown at that time in relation to the thrust wheel  35   c  provided on the bottom. 
     The carrier, as best seen in FIG. 1 a  therefore rides on the rollers on the track profile seen in FIG. 13A on the surfaces  18   e  for the roller wheels  39   b  and in the notch or cut-out recess  18   d  for the side portions adjacent the roller  39   b  at  39   z . The pinion portion  35  therefore has an opening  35   b  for receiving the shaft  32  which extends toward the bottom of the opening  35   d  and which opening  35   b  as best seen in FIG. 14 is compatible with the shape of the shaft  32 . The outer surface  35   a  of the opening  35   b  is compatibly shaped with the opening in the carrier so that the opening  35   b  may be accessible to the shaft  32 . At the bottom of the pinion portion  35  is a thrust wheel carrying portion  35   e  which carries the thrust wheel  35   c . The thrust wheel  35   c  therefore rides in between the shoulders  18   c  and  18   b  on the surface  18   d  of the track profile  18 . The thrust wheel is provided to accommodate any wind load which may be placed on the system when the window is opened. Further, in the normal meshing of gears with a rack, there is a thrusting force created as the pinion  35  moves on the rack  18   x . Therefore, the thrusting wheel will engage from time to time the shoulders or the surfaces defined by the shoulders  18   c  and  18   b  so as to maintain the parallelism and the accuracy of the installation of the window system. A pinion gear  35   a  is therefore provided between the thrust wheel  35   c  and the pivot receiving opening  35   b  which operates substantially as described in relation to FIG.  1 A and FIG. 1 in that as the window rotates the pivot rotates causing the gear  35   a  to rotate and move on the track. This is particularly advantageous when the pivot assembly is provided on a casement window as best seen in relation to FIG. 1A in that it is desirable to have the window move away from a pocket provided in the window jamb as best seen in relation to FIG. 1D so that the sash profile will not engage the jamb profile but will readily clear the jamb profile as the window is opened. For example, as best seen in FIG. 1D, proximate the top thereof, it may be readily seen that a pocket is provided in the jamb profile so that the pivot assembly  30  is accommodated at that end of the window. However, a flange portion unlabelled engages the sash cover portion so that within the jamb J 1  there is a pocket J 2  provided which improves the seal of the window in that the cover portion SC extends into the pocket J 2  when the sash is closed. However, when the sash is pivoted as in the case with the casement window of FIG. 1C, the pinion gear when pivoted will move the sash and the sash cover SC out of the pocket J 2  away from the jamb J 1  and provide suitable clearance so that the sash cover SC will not engage with the jamb portion J 3  which is a flange and therefore will clear easily the pocket and all its enabling portions. When the casement window is closed, the opposite happens and the sash cover SC will engage the pocket J 2  and be moved in position with the pivoting of the window to the closed position. 
     The rollers  39   b  therefore provide a smooth motion of the closure system in relation to the track which would not be present if the rollers were not provided since the track is made from aluminum. The rollers are not absolutely essential in every embodiment, however, it is preferred. 
     Referring now to FIG. 15, there is illustrated two sashes side by side shown in end view. The sashes are made substantially as constructed in relation to FIG. 17 wherein the sash  220  is defined by a central I-shaped portion  227  having an opening therein and two side abutting portions  225  and  226 . A pocket therefore for receiving the glass G is defined at  222 . Fin seal portions  221  are therefore provided for abutting the glass G which contains the normal known seal portion SX. The window sash profiles also include flange portions  224  proximate the opening opposite the glass G. Within that opening there is provided in use a closed cell caulking foam which is compressible at portion  240 . This portion extends totally along the sash profile within the opening as shown with the exception of the portion adjacent the pivoting assembly. A cover portion therefore is provided at  230  which engages the tab portions  224  proximate each side of the sash profile. This cover portion when inserted is flexed downwardly as the closed cell foam  240  is compressed as best seen in FIG. 15 a  so that the flange portions of the cover at  230   a  engage with the flange portion of the sash at  224  to provide a compressed seal for the track cover  230 . The track cover is defined as a track cover although it does occupy the sash as a component thereof in that as the sash is closed over the opening defined between the flange portion  16   a  and  16   b  as best seen in FIG. 15 a , the snap cover portion will extend down into and engage with the flanges  16   a  and  16   b , thus covering the track and snapping into position each time the sash is opened and closed. The typical seals BX and BY are provided as is known in the art. 
     Alternatively, as best seen in FIG. 1D, the sash covers may include alternative embodiments shown proximate the jamb portions  16   a  and  17   a  of the window assembly. Alternatively, a cover portion may be provided over the track portion  15  of sill portion  220  and header portion  220  of FIG. 18 that engages with the sash profile in a similar way to that of the track cover of FIG. 15 a  with the exception that the track cover only extends over the second half of the track, that is to say the second half not carrying the window. For example as shown in FIG. 2, the wheel portion  39   a  may be eliminated and the track cover may extend along the track portion opposite the pivot assembly so that the sash may slide on the track cover and be assisted to be supported by that track cover only in the second half of the track profile thereby eliminating the second carrier of FIG.  2 . The track cover therefore in FIG. 2 as an example would extend from the carrier  39   a  toward the left side of the page to allow the pivot assembly  35  to move to approximately the position of the present carrier  39   a  wherein it would engage the track cover. In the movement of the carrier  35  to that position, the other end of the window would already be supported by the track cover. This installation therefore would eliminate the carrier  39   a.    
     Referring now to FIG. 16B, there is provided locking detents  250  and  251  which engage with the locking detent portions  202  and  212  of the lock and nut portions  200  and  210 . These locking portions  250  therefore and  251  are operated by a handle  260  as best seen in FIG. 16A which is rotatable to cause the motion of the rack portion  265  and the detent  250  into and out of the locking abutment provided with the lock block and the lock nut  200  and  210  respectively. In FIGS. 16,  16 A and  16 B, the installation is provided for a casement window assembly. In the United States Patent Application described in the Summary of the Invention which was incorporated by reference, there is no provision of a casement-style window lock. Nor was there the provision of a lock block or nut detents  210  and  200  respectively. The handle therefore  260  is rotated by the user which causes the movement of the corresponding pinion gear  261 , the rotation of the pinion gear  261  affects the movement of the rack  265 , and the latch engaging portion  250   a  and  251   a  carried within the housings  255  and  254  respectively as best seen in relation to FIG.  17 . The rotation of the pinion will therefore also cause the motion of the rack portion  266  sufficiently as provided by the opening  266   a  of said rack portion to allow for engagement of said rack portion with said rack portion  265  with the bottom portion affecting the latching and unlatching of detent  251 . Intermediate the two latching portions for the casement window is provided a second pinion  267  which is rotated effectively by the movement of the rack portion  266 . Rotation of the pinion  267  causes rotation of the pinion sector  268  which is engaged with the locking detent  269  for the latch plate  270  and the detent  271  thereof. This latch plate is typical for casement windows as is the movement of the lock  269 , i.e. the rotation thereof. However, with the central locking system provided with this invention, it is the one handle operation of both the detents  250  and  251  and the casement window lock  269  which is in combination the essence of the central locking system. Alternatively, the casement window portion may be left out and the essence of the locking system therefore includes the locking block in the track which provides a detent for the locks  250  and  251  respectively. 
     As best seen in relation to FIG. 17, there is provided a cover C(x) which hooks into the sash profile similarly to the cover  230  previously described in relation to FIGS. 15 and 15A through which the handle portion  260  extends. Therefore, the latch assembly is contained within the sash profile, and the only portion extending outside of the sash profile is the handle portion. This handle portion is considerably smaller than the normal handle portion provided with a casement window which is typically rotary, and there is a tremendous elimination of components for a casement-type window. In fact, this will be described hereinafter. 
     Referring to FIG. 17, there is shown an exploded perspective view of the window assembly which will fit into the track profile similar to FIG. 18, but more specifically which may be designed for a casement window. The sashes  220  are provided with an opening  227  wherein a corner connector  280  is provided which extends into the opening  227  proximate all four corners and eliminates the necessity for welding. Clip portions  281  bite into the vinyl and are tapered in a direction so as to prevent the removal of the corner connectors once inserted within opening  227 . This snap lock feature therefore provides for the installation of the corner connectors and the quick fastening of the sash profile around the glass G. The track covers  230  are therefore provided and snapped into position once the closed cell foam, best seen in FIG. 15 a  at  240 , is inserted within the opening of the sash profile. The hardware including the carriers, best seen in FIG. 18, which are then assembled within the opening opposite the glass of the sash proximate each jamb portion in use. The hardware therefore including the top and bottom track engaging portion  39   x  and  37   x , the shaft  32 , the connector  31   b x, the other shaft  31 , and the small shaft  34   c  are provided proximate the pivoting end of the window assembly within the sash profile enclosed by a cover similar to that of cover CX. The central lock as described in relation to FIGS. 16,  16 A and  16 B is therefore inserted within the other opening of the sash profile and assembled and covered by the cover CX. The window sash is now available for installation within the frame assembly of FIG. 18 once the carrier portions  39   x  are engaged with the respective shafts  32  and  34   c . The block portions  200  are therefore locked in position once the track is installed in the frame, and the nut portions are adjusted to allow for the parallelism of the carriers  39   x  within the tracks to ensure the parallelism of the sash so that it rides well within the track portions. The window is therefore assembled. 
     For a casement window, all of the prior art levers and latch mechanisms are substantially eliminated. This means a great deal to window manufacture in that there are a considerable number of screws and fasteners to hold down the prior art lever linkages of the prior art systems. In the present invention, only the latch block fasteners are provided. The rest of the window assembly merely snaps together with a friction fit of the sash profiles, the sash profile covers and the frames. A minimum of assembly labour is therefore required with the installation of this window assembly. In one particular situation where an old style double-hung window is installed within an opening, it may be conveniently removed by an installer and the present invention may be installed in any of its embodiments including a casement window. 
     This is heretofore unknown in that a casement window occupies a certain standard space in the industry, and because of the linkage systems and the known systems, it is not possible to provide a larger window. With the present invention, a larger casement window may be provided which is easily installed with the minimum amount of labour and assembly time required. Should the window now be mis-alligned for any reason, it may be easily adjusted by the rotation of the screw  206  provided. A sophisticated user therefore could easily adjust this once instructed over the phone by an installer, or alternatively the installer may return for a quick adjustment at any time. Also, the window assembly is less likely to go out of adjustment because of the great care taken in the development of the precision of the assembly. 
     A method therefore of assembling the window may be considered as described in the above-mentioned description wherein, firstly the sash components are assembled by the quick fastening feature of the corner locking portions which are inserted within the opening of the sash profiles provided and provide one-way friction fit. The closed cell caulking is therefore inserted within the top and bottom of the sash assembled and these portions are covered by the track covers by the compression of the closed cell foam and the engagement of the tabs of the track cover with the tabs of the sash profile. The hardware is then installed along the vertical portions of the sash within the openings thereof opposite the glass which is then covered by a sash cover portion provided. The hardware located proximate the pivoting end is therefore installed on the carrier portions and inserted within the track portion within the sill and header, for example of a window assembly. The window is therefore closed in position with the sash covers or track covers located proximate the sill and header snapping into the frame and closing any path for air to enter the window and pass the primary seals provided as best seen in relation to the FIG.  15 A. The track covers also provide blockage of light, air and the friction fit of the sash into the track portions. By providing a track cover along the track remote the pivoting end of the window, this track cover may be used as support as well for the window assembly. 
     In another embodiment not shown, a double casement window is provided which is provided in a straight-line window, that is to say a frame is provided wherein a central mullion is disposed. A central mullion separates two casement windows, one opening as a mirror image of the other and containing all of the elements described above in relation to the pivot assembly and the central locking system and track system. 
     Referring now to FIGS. 1 and 1D, there is illustrated a retractable screen contained within the opening of the jamb within a framing section for a window assembly having a header  17 , a sill  15 , and two side jambs  5  and  10 . The side jambs  5  and  10  are somewhat identical with the exception of the details herein provided. One of said jambs  5  or  10 , or for that matter in alternative embodiments sill  15  and or header  17  may contain a retractable screen stored on a tube. This may be seen in relation to FIG. 21 which is comparable to FIG.  1 D. The screen assembly  300  includes a tube  305  having a pair of ridges  305   a  contained within the hollow  300   a  thereof, said hollow  300   a  for receiving a spring  301  being a torsion spring having two ends  301   a  and  301   b . Said ends  301   b  and  301   a  for anchoring into the assembly and for ensuring that the spring stays in constant torsion loading. A pin assembly  310  and  311  are disposed proximate each end of said tube  305 . The pin  310  includes an opening  310   a  for receiving the end  301   a  of said torsion spring  301 . Likewise, the insert  302  includes an opening  302   a  for receipt of the end  301   b  of the torsion spring  301 . The insert  302  engages the pin portion  311 . The pin portion  310  engages the bushing portion  312 . The pin portions  310   b  and  311   b  are inserted within mounting brackets M 1  and M 2  for mounting in the hollow of the jamb section. The rib portions  305   a  and  305   b  engage with corresponding rib portions provided with the pin section  311  and the bushing  312  to prevent rotation of the pins with respect to the tube unless the tube itself is rotated. With respect to the brackets M 1  and M 2 , spacers S 1  may be provided to orient and correctly space the screen assembly in the jamb portion or pocket within which the spring assembly retracts. The screen S is manufactured from a flexible material and has disposed proximate the ends thereof screen welding material or adhesive to adhere to the roller  305  and to the joint provided with respect to the handle portion  320  illustrated best in relation to FIG.  30 . The other end of the screen is inserted within the alligator-type locking jaw of FIG. 30 between elements  320   a  and  320   b  to capture the screen portion S 2  therein. The screen portion  320  also includes a seal portion  321  which will be described hereinafter which locks and is retained within a channel  322  provided on one edge of the aluminum handle portion. Openings  325  and  326  are provided with the handle assembly  320  so as to retain the guide portions  330  therein. The guide portions  330  are contained within the openings  325  and  326  of the handle portion  320  so as to guide the screen assembly as it pays out from the jamb in a track portion provided with the header and sill portion of the framing sections. A latch portion and a latching plate  350  are shown with the assembly. The latching plate  350  is affixed to the opposite jamb for engaging with the latching member  340  wherein the detents mate and cooperate to retain the screen in its closed position. A seal  321  is contained within a seal receiving channel  320   a  to seal against the opposite jamb and prevent bugs from entering the living space. The guide members  330  include a leg  330   a  which are compatibly shaped with the opening  325  within the handle portion  320 . The handle portion  320  is extruded from aluminum to form all of the details thereof. The bracket portions M 1  and M 2  are mounted within a pocket P as seen in FIG. 1 containing the roll  305 . A cover plate  350  therefore is provided which snaps into place via the leg portion  350   a  being inserted within an opening provided adjacent the jamb pocket. The jamb pocket therefore is defined by three sides  10   a ,  10   b  and  10   c  against which the closure member buts up against and seals. This will be described hereinafter in relation to FIG.  21 . The screen assembly, and particularly the brackets of FIG. 19 are therefore installed within the frame pocket P of FIG. 21 as being keyed into said frame pocket and engaged with the rear wall  10   c  of the jamb  10 . The roller cassette  300  is then installed within the pocket P being pre-tensioned and wherein the pin portions  311   b  and  310   b  are inserted within openings O 1  and O 2  within said brackets, and the adjustment is provided via the bottom bracket M 2  including the spacer S 1  with the supplemental adjustment M 3  to ensure that the roller is properly placed in the system. The tension may be adjusted if required by removing the snap-on cover portion  350  at any time. The handle portion  320  is specifically sized to be received within the opening defined between the cover  350  and the adjacent jamb portion  10   b.    
     Referring now to FIG. 20, there is illustrated a similar cassette assembly for a retractable screen to that of FIG. 19 with the exception of the mounting brackets and the particulars of the screen. All other elements are identical or substantially identical. The brackets  360  therefore engage the generally T-shaped guide  350   b  of the snap-on cover  350  proximate the generally T-shaped channels  360   b  disposed therewith as best seen in relation to FIG. 28 b . Only one of the T-shaped channels or pockets  360   b  therefore engage the T-shaped guide  350   b  which allows for a certain amount of adjustability in relation to the positioning and pretensioning of the screen assembly  300 . The cover is therefore utilized as a chassis to hold the screen brackets and hence the screen cassette. The edges of the screen S 1  and S 2  are therefore provided with adhesive in the form of a tape system to mount the edge S 1  onto the hollow tube  305  and to mount the edge S 2  into the screen-receiving pocket of the handle portion  320  at  320   a . The glides  330  at the end of the handle portion  320  telescope to accept manufacturing installation variations prior to snapping them into the flexible frame track provided thereby providing a seal for the screen pocket and guide rails. 
     Referring now to FIGS. 21,  22  and  23 , the screen embodiments shown in FIGS. 19 and 20 may be utilized with a screen assembly as best seen in relation to FIGS. 22 and 23 which include generally T-shaped key portions S 1  and S 2  which are generally T-shaped and which engage with generally T-shaped openings  305   x  and  350   x  within the tube  305  and within the handle  350  in one embodiment of the invention thereof. By providing such a keyed relationship between the handle and the screen, screen replacement becomes very easy eliminating the need for adhesives and the general cutting of screen sections. The screen width indicated as Z therefore is a constant for all screens. Therefore, one continuous screen may be manufactured having the keyed portions located and anchored to the ends thereof as one continuous roll of screen having a predetermined size or width Z which may be cut to the desired length as the only variable dimension when making the screen assemblies of FIGS. 19 and 20 and/or replacing the broken screen which might result under normal wear of FIGS. 19 and 20. 
     Referring now to FIGS. 1D and 21, the screen assembly  310  included in the jamb does not compromise the typical framing size and standards nor interfere with the window function. Clearly the closure member or window  21  may be swung outwardly away from the jamb and be sealed against the seal  21   a  in a closed position. Alternatively, when the window is a tilt and slide, the window  21  may be slid away from the jamb  10 . When the window is in the closed position, there is no need for the screen to be utilized. Therefore, the screen assembly  300  remains hidden within the jamb portion  10  of the window assembly. An esthetically pleasing result therefore is pleasant without the unsightly screen being present and without the unsightly lines of an additional housing added onto the jamb section  10 . The cover portion  350  including the guide  350   b  may equally be utilized on the side  10   b  of the jamb  10 . That is to say it is not necessary to have the cover  350  close the three-sided jamb sections  10   a ,  10   b  and  10   c  from the front face thereof as shown in FIG.  21 . Equally, the side face  10   b  and in one embodiment a preferred approach will be utilized for the cover facing  350  wherein the cover therefore is not observable at the front of the jamb  10  but only at the side making a much more esthetically pleasing installation. 
     Referring to FIGS. 24,  25 A,  25 B,  26 A,  26 B,  27 A and  27 B, there is illustrated the tube of FIG. 24 having a predetermined diameter and having rib portions  305   a  provided therewith which engage with the compatible detents provided with the pin assembly at  311   a  which prevents the rotation of the pins with respect to the hollow tube  305 . In this way, the torsion spring  301  and its effort can not slip in relation to the pins  311   b  and  310   b . Similarly, the pin assembly embodying  302  as rib portions  302   b  to prevent rotation thereof with respect to the tube portion  305  when engaged with the pin assembly portion  311 . An opening  302   a  is provided to engage the spring end  301   b  and help in establishing the loading and the constant torsion of the assembly. Similarly, the pin portion  310  has an opening  310   a  for engagement with the end of the spring  301   a  prior to insertion within the bushing  312  which also includes rib portions  312   a.    
     Referring now to FIG. 28A, there is illustrated the bracket of FIG. 20 which bracket  360  includes a pin-receiving opening and a pair of generally T-shaped openings  360   b  for receiving the guide portion  350   b  of the flexible cover  350 . Only one of the openings  360   b  is utilized depending on whether the bracket is being utilized as a top or as a bottom bracket. Clearly, the bracket has adjustability in that it may slide along the guide  350   b  in the flexible cover to the predetermined position to turn by the distance separating the pins  311   b  and  310   b  in the screen assembly. The brackets then may be fixed in position utilizing glue or the like and may be fastened to the opposite wall  10   c  of the jamb  10  of FIG. 21 using conventional methods. It is recommended that the fastening be a removable fastener type allowing for repair of the screen assembly. 
     Referring now to FIGS. 29A and 29C, there is illustrated the glide portion  330  shown in FIGS. 19 and 20 which glide portion has a generally T-shaped guide-receiving portion  330   b  to retain the channel. The member  330   a  therefore is provided to be inserted within the opening  325  of the handle portion  320  to seal the entire assembly. Said foot  330   a  can be moved in and out of the opening  325  to allow for adjustment as is required. 
     Referring now to FIG. 30 in relation to FIGS. 19 and 20, the handle portion  320  is therefore shown including alligator jaw-like portions  320   a  and  320   b  as seen in FIG. 20 for capturing the edge S 2  of the screen S when the portion  320   b  is crimped and moved toward the edge of portion  320   a  capturing the screen therebetween via serrated edges  320   i  of the side  320   b  of the joint. An opening  325  is provided for receipt of the guide portion  330 . The handle portion  320   i  allows a user to remove the screen as required. 
     Referring now to FIGS. 31 a ,  31   b ,  32   a  and  32   b , there is illustrating the latching portions of the screen assembly comprising items  340  and  350 . The portion  340  is mounted on the handle portion  320  and is clipped in position via a hook portion  340   b  to be retained within a slot  320   i  and  340  as best seen in FIG.  19 . This latching portion engages the latching plate of FIGS. 32A and 32B which is mounted via mounting openings  350   b  of the latching plate  350 . The opposite jamb is utilized to mount the latching plate  350  so that as the screen moves across the opening framed by the frame assembly, the detent or latch portion  340   a  engages the latch portion  350   a  of the latching plate to retain the screen in its operative position. This can be released of course by disengaging the latching portions  340   a  and  350   a  respectively wherein the screen may be retracted within the opening in the jamb  10  of the framing section. 
     Referring now to FIG. 33, there is illustrated the but seal  321  which is anchored in position within the groove  320   a  of the handle portion  320  via legs  321   a . The bug seal  321  therefore buts up against the opposite jamb portion not shown via edge  320   b , that is the same jamb portion to which the latching plate of FIGS. 32A and 32B is mounted. 
     Referring now to FIG. 34, there is illustrated the cover portion  350  for the assembly of FIG. 20 which includes an arm or leg portion  350   a  which is received within the channel  10   x  of FIG. 21 which includes a locking edge at  350   b  to retain said arm  350   a  within the compatible groove  10   x  which also includes a detent at  10   y  to correspondingly lock the flange in position. The element  350   c  therefore is disposed within the interior side of the cover  350  to be received within the channels or guides shown in FIGS. 28A through 28C at  360   b  and thereby retain the mounting brackets for the screen assembly in the position required allowing the adjustment thereof and final fixing in relation thereto. 
     Those skilled in the art will also appreciate the fact that a screen assembly having two ends separated by a predetermined distance and being formed as a continuous screen which may be cut as required at a predetermined distance as set out by the length of the tube  305 . The anchor portions S 1  and S 2  are a fixed distance and are manufactured with the screen on a continuous length of screening which may be cut as required including cutting these anchor portions as best seen in relation to FIG.  23 . This makes screen replacement very easy. 
     The entire assembly therefore  300  is provided as a cassette totally assembled and insertable into the jamb opening defined by the three sides of the jamb  10  at  10   a ,  10   b  and  10   c . It is only necessary to provide the cassette integral with the cover portion  350  which may be either the front cover which clips in position as shown in FIG. 21 or a side cover, not shown, but easily determined by those skilled in the art from the teachings herein. 
     As many changes can be made to the invention without departing from the scope of the invention, it is intended that all material contained herein be interpreted as illustrative of the invention and not in a limiting sense.