Abstract:
The device provides for the formation of a CD jacket using conventional or custom dimensioned paper by imparting a diagonal folding pattern to the paper to be used for the CD jacket. The folding pattern is imparted to the paper and a defined series of folding steps followed to yield the CD jacket. Reversing the last step in the folding sequence provides access to the internal pocket formed by folding the paper through an aperture in a top flap. Completing the last step in the sequence seals the internal pocket. The folding sequence may be imparted to the paper using printing or scoring or both to yield the diagonal lines on which folds are made.

Description:
FIELD OF THE INVENTION 
     This invention relates to the storage of compact disks used in computers and audio and visual entertainment systems. More particularly it relates to improvement of the containment, personalization, transportation, computer enhancement and storage method used to retain a digital compact disk, known and related to further in this disclosure as CD&#39;s, through the placement of a target grid for folds on paper allowing individual assembling of personalized CD containers from single, uncut sheets of conventional or custom dimensioned paper. 
     BACKGROUND OF THE INVENTION 
     The digital compact disc, or CD, now commonplace in stereos and computers, was introduced in 1982 for digital and audio reproduction. Formally known as compact disc read-only memory, it is a form of a compact disc that reads by optical means. The CD-ROM drive uses a low-power laser beam to read digitized (binary) data that has been encoded in the form of tiny pits on an optical disc. The drive then feeds the data to the computer for processing. Co-invented by Philips Electronics N.V. and Sony Corporation in 1980, the compact disc has expanded beyond audio recordings into other storage-and-distribution uses, notably for computers (CD-ROM) and entertainment systems (videodisc). The compact disc comprises a thin polymeric circular member approximately 4¾ inches (12 centimeters) in diameter and having a central aperture to be received on the spindle or centering mechanism of a CD disc player. With the proliferation of growing multimedia files (i.e., audio, graphic, and video) in computer games, educational software, and electronic encyclopedias, as well as high definition movies and the ever expanding storage medium, digital videodiscs (DVD), introduced in 1995, the average computer users are acquiring a large number of CD&#39;s. 
     Shortly after the advent of the compact disc the conventional “jewel box” packaging container was adapted for sales and storage. These polymeric containers hinge on one side opening to access the internal compartment housing the CD disc, and are susceptible to cracking, and breakage of the hinges. Additionally, the over-all thickness of 0.3125 inch of the container, is far greater than necessary for the protection of the disc, making the storage of multiple discs unduly wasteful of space. There has been little or no change in the basic shape of the CD holder since its initial development. Other storing methods include modified envelopes, which may be purchased from an office supply, but have no method of personalization or computer enhancement such as printing upon them using a conventional printer. 
     U.S. Pat. No. 4,694,954 of Ira. Moss discloses an article of manufacture comprising a compact disc and convertible package thereof. The device comprises a blank, divided into four panel members by cruciform pairs of parallel intersecting fold lines. A flap portion is formed adjacent to a surface of at least one of said panels and the compact disc is received between the flap and panel. The device may be converted to the storage mode by removing the film, discarding the stiffener member, and folding the panels about the cruciform fold lines to provide a structure in which the disc is encompassed between four thicknesses of material. Tendencies of the device to buckle of expand when in the storage mode are minimized by removing the portion of the blank that encompasses the intersection of the hinge lines, and by connecting the flap to one of the panels in a tension condition. This is primarily a sales and promotional device, providing the durability required to protect the CD, with the limited capability of being modified for a storage container. It still remains a stiff polymer packaging device, with more than the necessary thickness required for storing compact discs and lacks the ability for computerized personalization. 
     U.S. Pat. No. 4,203,521 of Stanley A. Dunn teaches of a packet for containing documents and for providing thermal protection of those documents, the packet including a sacrificial ablating layer surrounding the documents, and a metal foil covering for shielding the ablating layer from contact with surrounding air. This is a packet for providing thermal protection for documents, with no indication of the light, thin storage of compact discs. 
     U.S. Pat. No. 5,004,144 of Betty J. Selga describes a reusable gift-wrapping comprised of a flexible expanse of folding fabric having releasable Velcro fasteners secured to its periphery. The Velcro fasteners are engaged when the fabric is folded to envelop a carton placed within the expanse of foldable fabric. This is clearly a process of gift wrapping not relating in any way to compact disc storage. 
     U.S. Pat. No. 6,117,061 of Ghanshyam H. Pompat et al, discloses a method for custom printing and forming three-dimensional structures using a computer and a computer-controlled printer, incorporating several steps. A flexible rectangular sheet is perforated to form a removable portion. Lines of weakness are formed on the removable portion, to serve as fold lines that ultimately fold the two-dimensional removable portion into a three-dimensional structure. A user instructs a computer program to command a computer-controlled printer to print particular information onto the printing surface of said removable portion. After printing, the user removes the removable portion from the sheet along the perforations and then folds the removable portion along the lines of weakness and secures the folded sheet into a three-dimensional structure. The computer program enables the user to design the custom printing for the structure, and optionally to preview the ultimate appearance of the three-dimensional structure. With this invention a computer is used to create a three-dimensional object to be cut or removed from a single sheet of paper, by the means of cutting on computer generated lines or pre-applied scoring or perforations in the paper. When paper is put through two separate devices as in a scoring or perforating device, and then into a computer by an amateur or a person unskilled in the act of publishing, there may be some alignment problems. Although this object is created from a single sheet of computer paper, there is an involved cutting or separating process along with attaching the parts, and it does not relate to the packaging or storing of computer compact discs. 
     U.S. Pat. No. 5,590,912 of Scott A. Stevens describes a product and method relating to a personalized envelope assembly secured to the interior of a printed publication such as a magazine, and more particularly to the means and method for binding in the envelope assembly to a personalized and/or customized publication and containing an information bearing disc. This patent primarily deals with the insertion of an envelope into a publication along with the binding methods, not relating in anyway to the personalized unique formation, storage and containment of compact discs constructed from a single sheet of uncut computer conventional or custom sized paper disclosed herein. 
     U.S. Pat. No. 5,638,666 of Gil Davidov discloses an invention directed to an apparatus and method for making an envelope from ordinary size, readily available, writing paper. Preferably, the apparatus is a compact desktop size machine that can be combined with any common office printer, such as a laser printer, or even incorporated therein, to form a single machine. This patent describes a machine for making a mailing envelope from a single sheet of paper, not conveniently adapted to the unique shape of a computer disc, where the disclosed invention requires the unique use of diagonal folds to adequately enclose the compact disc. 
     U.S. Pat. No. 6,006,457 of Felix Transport teaches of collapsible three-dimensional hollow ornamental structures. A polyhedral shaped, collapsible hollow structure having a fully enclosed hollow interior that is made from a blank cut from a single sheet of folding board or like sheet material, the blank having a dual cruciform configuration and being provided with a plurality of longitudinal, transverse and oblique scores to enable it to be folded and glued. This patent describes another folded ornamental device made from a single sheet of folding board or like material of no specific size, which requires cutting out or removing by using the perforation process. This patent bears no similarity described herein to the folded jacket, that may be used for the storage or mailing of compact discs. 
     Consequently there exist a growing need for a CD storage device that can easily and individually be formed from simple conventional paper. Such a device should use a simple method for constructing individual CD jackets to provide containers for the ever growing number of compact discs that are used in the field of audio, graphic, and video software. In forming such a CD jacket from conventional paper, the method and apparatus should provide easy user configuration and assembly of jacket that is easily customizable for labeling of the contents, and providing secure storage from damage for the computer disk therein contained. 
     SUMMARY OF THE INVENTION 
     The above-noted problems and others are overcome by the unique CD Jacket device, and the method for its forming from but not limited to a single sheet of uncut, standard size paper. Using a computer program or pre printing, fold lines identifying information and ornamentation for the contained disk, will be printed on the paper used for forming the jacket. Printing on both sides of the paper may require printing on one side then turning the paper over and re-inserting the paper back into the printer and printing again on the reverse side. The use of conventionally sized paper is allowed through the use of a novel folding pattern using target fold lines formed with diagonal printing or placement which designate the precise pattern for the diagonal fold lines used to form the appropriate sized CD jacket. Placement of the fold lines on the chosen piece of paper will be accomplished in one preferred embodiment through a special computer program devised for this purpose. The paper may be the common white paper used in computer printers or optionally a custom paper with a glossy color, or just colored surface on one or both sides thereby producing user customizable and professional look. 
     For optionally enhanced embodiments of the jacket device, custom paper could be provided to the user for imprinting on the computer printer which has adhesive activated by moisture or pressure on the inner surface of the top flap, or on inner surfaces of both top and bottom flap or the inner surface of just the bottom flap of the CD Jacket. Pre-printed and pre-scored papers can be made available in a packaged unit for those without a computer but desirous of using the CD Jacket for audio or video purposes and the ability to label it. The most common adhesive means would be placing a strip of commercially available double sticky back adhesive tape, one half inch from the edge, along the bottom flap, so that the top flap will tuck beneath the bottom flap. With a specialty paper pack for the CD Jacket, double sticky tape can be supplied however conventional transparent tape would work. Different weights or thickness of paper may also be used for the CD Jacket. The paper will be folded along the diagonal lines that are printed on the paper surfaces. 
     An additional embodiment would define the necessary diagonal fold lines by scoring the sheet of paper with one of the scoring methods disclosed or using pre-scored paper. Scoring while not necessary to define the diagonal fold lines, allows simplification and accuracy of the folding process. 
     While one preferred embodiment of this invention will use the conventional 8½×11 inch paper widely available and used on most computer printers, other optional sizes of paper, like A4 or a specially cut size, while not as convenient, will work and should be considered to be covered within the scope of this patent. Additional benefits are gained by using a paper sized to yield an even better dimensioned final envelope by using a paper substantially 8.5 inches by substantially 11.769 inches. 
     The unique feature of this patent when used to encompass a conventionally sized CD, is by the provision of a target means for the specific fold lines to yield the diagonal folding of the paper along two primary substantially parallel diagonal lines substantially 4⅞ inches apart. Then the paper is folded along two secondary substantially parallel lines 4⅞ inches apart, substantially normal to the first two lines thereby yielding a square enclosure for the intended CD. All folding will be done inwardly forming the enclosure area, with fold lines printed scored or otherwise properly positioned on this surface, designated as the second surface of the paper. 
     The enclosure area of the CD Jacket provided by the designated target fold lines, provides an area adequately large enough to retain one compact disc and the literature commonly enclosed within the commercial packaging. The outside of the CD Jacket may be printed with information and/or ornamentation 
     The device to yield a CD jacket using conventionally sized paper uses an initial fold being made inwardly and diagonally from the upper left hand corner of the paper to the right hand side of the page along the computer generated or preprinted, transferral fold line, forming the hypotenuse of a right triangle, thus creating the first primary fold. The second primary fold is made inwardly, and substantially parallel to the first primary fold, 4⅞ inches apart, translating diagonally across the paper along the hypotenuse of a second right triangle, at or immediately adjacent to the corner of the paper, and also along a transverse fold line. With the 90° corner of the first right triangle folded over along the first primary transverse fold line, inwardly and flat against the paper surface and the 90° corner of the second right triangle folded over along the second primary fold line, flat against the paper surface, the paper will take the form of a parallelogram with the lower corner missing. In the parallelogram state the first surface of the paper forming the outside of the CD Jacket has the secondary perpendicular fold lines printed on it so that the bottom flap and top flap can fold in place. The top and bottom flaps are in the shape of quadrilaterals with acute and obtuse angles on one side, and 90° angles on the folding edge. The bottom flap can be adhered in place by means of double-back sticky tape, or pre-applied adhesive on specialty paper along the diagonal edge. The adhesive is best distanced from the edge, currently substantially ½ inch back from the edge, allowing the top flap to be inserted under the edge. On the acute end of the bottom flap, the angle falls short, forming a natural tab, to aid in the insertion of the top flap beneath the edge of the bottom flap. 
     With this unique design the CD Jacket formed from standard 8½ by 11 paper has a desired diagonal opening flap providing an insertion aperture communicating with the pocket formed inside the folds that when in the open state creates a channel by which the compact disc rolls into the enclosure or pocket. The opening flap can then be folded over to maintain the CD inside the pocket. 
     Optionally, paper can be provided with scoring of the diagonal target folds formed along the transverse fold lines which will make the folding process easier, but is not necessary in creating the CD Jacket. Or, the paper may be custom sized to yield the best current embodiment of the device by using paper substantially 8.5 inches by substantially 11.769 inches which thereby yields a CD jacket with the especially easy to use openings and flaps. 
     Although diagonal folding along the printed lines is the simplest preferred embodiment to provide target folds that will yield a CD jacket, a number of alternate means to produce the desired diagonal target folds may be incorporated into the assembly process that will make the folding process easier. The first being a folding platen with the transverse fold lines relieved on one side and projecting on the other so that when the paper is inserted and the platen is closed, the paper will be adequately deformed along the diagonal target fold lines. The second method of placing target lines for folding on the paper would use scoring and would entail a plastic template. The templet would have elongated slots communicating therethrough in positions to scribe the paper in the proper position for the target folds whereby the user would use a tool to scribe the lines along the edges of the template. The third method of providing the lines properly positioned for diagonal folding scoring would incorporate an embossed sheet of plastic with protrusions along the transverse fold lines so that when the plastic sheet was placed over the paper and the surface is rolled over with a small roller, the impressions are inscribed into the paper making the desired scoring application. 
     It is an object of this invention is to create a personalized paper enclosure for a compact disc, which can be folded to size by an individual using computer placement of target diagonal fold lines printed on conventional sized paper. 
     Another object of this invention is to create an enclosure for a compact disc that requires no cutting to fabricate and requires only folding along printed diagonal fold lines to assemble. 
     A further object of the invention is to create a CD Jacket that can be further enhanced and customize through computer generated graphics and text which may be printed on both sides of the completed enclosure. 
     Another object of this invention is to create a CD Jacket easily formed from specialty papers, colored, glossy, pre-scored or with adhesive applied for a sealing means. 
     An additional object of this invention is to create a CD Jacket from a single sheet of paper that can be glossy, colored and individualized on one side, and when folded the enhancement will be displayed on both sides of the completed CD Jacket. 
     Still another object of this invention is to create a storage envelope for a CD that is approximately one fifth the thickness of the current plastic cases used for sales and storage thereby reducing the required area for the ever increasing number of compact discs used by individuals in their audio, graphic, and video applications. 
     And yet another object of this invention is to provide a method and apparatus for scoring the paper to yield the diagonal parallel fold lines either before or after printing, to simplify the folding process forming the resulting CD jacket. 
     These together with other objects and advantages which will become subsequently apparent reside in the details of the construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING FIGURES 
     FIG. 1 depicts a perspective view of the CD Jacket in the folded state, with the top flap tucked under the lip of the bottom flap exposing only the first surface of the paper. 
     FIG. 2 depicts a perspective view of a flat sheet of printer paper with transverse diagonal fold lines printed on the inside or second surface of the paper. The paper can be conventional 8.5 inch by 11 inch paper or in the best performing embodiment yielding the best dimensioned jacket, paper substantially 8.5 inch by substantially 11.769 inch would have the fold lines thereon. 
     FIG. 2A depicts a top view of the flat sheet of paper shown the fold lines and indicia indicating folding steps. 
     FIG. 3 depicts a perspective view of the sheet of paper with the 90° corner of the first right triangle folded over along the first, primary fold line. 
     FIG. 4 depicts a perspective view of the sheet of paper with the 90° corner of the second right triangle folded over along the second primary fold line and the paper in the shape of a parallelogram with the lower corner off, revealing the fold lines printed on the other side or first surface of the paper. 
     FIG. 5 depicts a perspective view of the CD Jacket with the bottom flap folded along the first, secondary fold line, and a CD partially inserted in the channel entry of the enclosure. 
     FIG. 6 depicts a perspective view of the CD Jacket with the top flap partially folded along the second, secondary fold line. 
     FIG. 7 depicts a perspective view of the under sides of the bottom flap showing the location of the optional adhesive strips. 
     FIG. 8 depicts a perspective view of an optional window available on specialty paper. 
     FIG. 9 depicts a perspective view of a platen with the transverse diagonal folding lines relieved in the base and projecting on the lid with a piece of scored paper. 
     FIG. 10 depicts a perspective view of a plastic template with cut-outs to guide a tool for scoring the paper. 
     FIG. 11 depicts a perspective view of a sheet of paper with a plastic sheet with the transverse fold lines protruding against the paper and a small roller pressing them in for the scoring operation. However a conventionally used printing scoring dye may also be used. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring now to FIG. 1, showing the fully assembled device  10  showing the front side  12  of the device  10  which forms a CD jacket in the assembled configuration with back surface  14 . FIG. 1 also displays the top flap  16  generally quadrahedral in shape with the indicia  18  forming a labeling designation area, folding instructions, or pattern, and with bottom edge  20 , of the top flap  16  tucked under top edge  22  of the bottom flap  24  generally quadrilateral in shape and extending through notch  23  which provides an engagement between the top flap  16  and bottom flap  24  thereby holding them in place. The corner tab  26  is formed where the tip or acute angle of the quadrilateral falls short. This corner tab  26  enables the bottom edge  20  to slip beneath top edge  22  easily, without catching on an extended acute angle. 
     FIG. 2 depicts a pre-printed perspective view of a sheet of paper  32 , with the second surface  28  in the up position, and the first surface  30  down. The sheet of paper may be  21  conventional 8.5 inch by 11.5 inch paper or in an especially preferred embodiment of the device  10  as depicted in FIG. 2 a , the sheet of paper  32  would be substantially 8.5 inches by substantially 11.769 inches. A folding pattern is placed on the second surface  28  or if desired the first surface  30  having primary and secondary fold lines positioned as targets for the folding necessary to yield the device  10 . The first primary fold line  34  translates diagonally from the upper corner  36  of the sheet of paper  32 . Of course the use of upper and lower and locational terms are used for illustrative purposes as those skilled in the art will realize that the lines and patters may be mirrored or otherwise imparted to the sheet of paper  30  to yield the device  10 . The second primary fold line  38  translates substantially parallel, diagonally across the sheet of paper  32 , substantially 4⅞ inches from the first primary fold line  34  when making a jacket for a conventionally sized CD. It should be noted that using diagonal lines allows the second primary fold line  38  to fall short of the lower corner  40  of the sheet of paper  32  thereby creating the desired corner tab  26  when  16  assembled. As is obvious to those skilled in the art the folding pattern may be mirrored on the sheet of paper  32  and yield the same jacket when folded. When using a sheet of paper  32  custom sized to substantivally 8.5 inches by 11.769 inches the fold line  38  extends exactly the bottom left lower corner  50  as depicted in FIG. 2 a  thereby yielding the current preferred embodiment of the device  10  when folded. 
     A first secondary fold line  42 A translates diagonally across the sheet of paper  32 , substantially normal or 90° to the first and second primary fold lines  34  and  38 . The second secondary fold line  44 A translates substantially parallel to the first secondary fold line  42 A and diagonally across the sheet of paper  32 , substantially 4⅞ inches from the first secondary fold line when the folding pattern formed is for a conventionally sized CD. 
     To initiate the four step folding sequence  33  which can be explained in directions distributed with the device  10  or printed on the device  10  as shown in FIG. 2A or as letters in sequence A, B, C, D, displayed in FIG.  2 A and shown in folds of FIGS. 3-6. The folding sequence  33  proceeds first as the top right corner  46  is folded across the sheet of paper  32  creasing along the primary fold line  34  placed as a target and creating the folded edge  48 . FIG. 4 depicts a perspective view of the parallelogram shape created when bottom left lower corner  50  is folded over along the second primary fold line  38  and creased to form the left folded edge  52 . Optional means of attachment such as the aforementioned adhesives such as adhesive tape  51  may be placed to hold the lower corner  50  in operative engagement when folded. Notably shown in this view is that the first surface  30  of the sheet of paper  32  covers most of the second surface  28 . Because of this, in preferred embodiment providing better viewing of the secondary fold lines  42 A and  42 B during folding of the device  10  the secondary fold lines  42 A and  44 A can be printed on the first surface  30  of the sheet paper  32 , creating the secondary fold lines  42 B and  44 B. However the device  10  will function with both secondary fold lines  42 B and  44 B just placed on the second surface  28  with a little more attention paid to the line positions. 
     FIG. 5 depicts a perspective view of the device  10  formed after the first three steps in the folding sequence yielding an open CD Jacket with the bottom flap  24  folded up along the second secondary fold line  44 B forming the bottom folded edge  54 . Compact disc  56  is displayed being inserted into aperture  58  which communicates with the storage pocket  59  formed between the folded flaps allowing a means for the CD to be inserted easily and slide into the storage pocket  59  or removed therefrom after the fourth fold in the sequence is completed by reversing the last fold and thereby providing access to the aperture  58  communicating with the storage pocket  59 . 
     FIG. 6 displays the device  10  pictured as a CD jacket with the top flap  16  partially folded along the secondary fold line  44 B. In the unique folding sequence of yielding the device  10  in the form of a CD jacket, the second surface  28  of the sheet of paper  32  is completely enclosed, exposing only the first surface  30  of the paper  30 . This surface may be printed upon by the user using indicia identifying the CD enclosed in the storage pocket  59  and any desired ornamentation. 
     While not necessary to function as a CD jacket, additional utility is yielded by a means of holding the top flap  16  to the bottom flap  24  to thereby securely hold the CD in the storage pocket  59  with the aperture  58  closed. Several common means of attachment the top flap  16  and bottom flap  24  into position may be incorporated as depicted in FIG.  7 . Most common, but not limited to, the use of adhesive means such as double sticky back tape  53  placed substantially ½ inch from, and parallel to the top edge  22  of the bottom flap  24 . Or optionally pre-applied, moisture activated adhesive  62  applied to special paper for the device  10  will be available. Or, the double sticky back tape  53  can be placed only on the inside of the bottom flap  24  to secure the bottom flap to the folded over first surface  30  and thereby providing an overlapping edge  63  at top edge  22  under which the top flap  16  may be removably secured. As is obvious to those skilled in the art, an adhesive means suitable to the purpose of permanent or temporary and removable attachment would be chosen. 
     FIG. 8 displays an alternate embodiment of the device  10  as a CD jacket with a cellophane window  64  allowing visual communication through back surface  14  displaying the literature or indicia about the enclosed compact disc thereby being self labeling. 
     FIGS. 9,  10  and  11  display perspective views of different means to impart the folding pattern to the sheet of paper  32  other than by the aforementioned printing of the folding pattern. In this embodiment the folding pattern is scored into the sheet of paper  32  and could be used instead of the aforementioned printed folding pattern, or in addition to the printed folding pattern to yield an both visual and tactile aids to the precise diagonal pattern required to yield the device  10 . 
     In this embodiment, a mechanical means to score the paper along the folding pattern would be provided. The first is a platen  70  that has top plate  72  with raised lines  74  projecting off the surface  76 , and a bottom plate  78  with matching grooves  80 , in surface  82 . When these two plates are folded together by means of hinge  84 , with a computer style sheet of paper  32  inserted, depressions  86  are inscribed in the sheet of paper  32  generally along the folding pattern, making the folding sequence easier. The second method would make use of a rectangular plastic template  90 , with slots  92  communicating therethrough that a creasing tool (not shown) can be inserted into to impart scores along the diagonal lines forming the folding pattern on the sheet of paper  32 . Should the printer on the computer which prints the lines on the paper fail, this templet  90  would also allow a pencil to be used to draw the folding pattern on the sheet of paper  32 . 
     Another embodiment of a device for scoring the paper that can be provided to provide a mechanical means of scoring the paper along the lines of the folding pattern would be an embossed sheet  94  of plastic or other hard material, with protrusions  96  rising from the surface and in positions to register with the desired fold lines of the folding pattern noted above. When the sheet of paper  32  is placed on a surface under the sheet  94  and a small roller  98  is rolled over the, impressions are transferred into the sheet of paper  32 , scoring the sheet of paper  32  in positions to correspond to the folding lines of the folding pattern. 
     The device  10  could thus be formed by printing the folding pattern on the sheet of paper  32  as depicted in FIGS.  2  and three and then folding the sheet of paper  32  to yield the device  10  in CD jacket form. Or the device could be formed using the scoring apparatus depicted in FIGS. 9-11 to score the paper along the fold lines of the folding pattern. Or, the device could be formed using both the printing and scoring to aid in the proper folding along the folding patter needed to yield the proper sized CD jacket. If provided in a kit form with both a mechanical means for scoring the paper with the desired folding pattern and software to print the fold pattern, the user could choose one or both means of imparting the folding pattern of diagonal lines to the paper as desired. 
     While the present invention has been described herein with reference to particular embodiments thereof, a latitude of modification, various changes and substitutions are intended in the foregoing disclosure, and it will be appreciated that in some instance some features of the invention will be employed without a corresponding use of other features without departing from the scope of the invention as set forth.