Re-inforced vinyl extrusions
||Retterer, John M.;
A hollow plastic member provided with end caps having holes therein through which wires can pass and be placed under tension so as to provide internal support for said member to reduce deflection of said member when a load is placed thereon and to return said member back within acceptable limits to its original position.
BACKGROUND OF THE INVENTION
Hollow plastic extrusions in the form of tubing or those extrusions which are rectangular in cross section are used for a variety of purposes, but especially for fence rails. Common plastic material used for this purpose is vinyl. When fence rails made from such materials are put under a load at right angles to the fence rail between the ends of the fence rail, the rail can deflect a great deal.
BRIEF SUMMARY OF THE INVENTION
The purpose of this invention is to prevent such deflection of hollow plastic extruded members, especially those used as fence rails. The hollow extruded member is provided with end caps which have at least two pairs of oppositely disposed holes therein and at least two wires each extending through each of two sets of holes in each end cap and extending the interior length of the fence rail and are then joined together at the outside of one of the end caps and placed under tension when so joined.
It is therefore an object of this invention to provide a hollow plastic extrusion with suitable interior wire reinforcing so as to prevent unnecessary deflection in use. This, together with other objects of the invention, will become apparent from the following detailed description of the invention and the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1. A perspective view of an extruded plastic rectangular member with the two wires suitably connected together under tension.
FIG. 2. A side elevation of the extruded plastic rectangular member.
FIG. 3. An end view of the end of the extruded plastic rectangular member in FIG. 1 where the wires are joined together.
FIG. 4. A section through FIG. 2 on the plane 4--4.
FIG. 5. An end view of the opposite end of the extruded plastic rectangular member.
FIG. 6. A side view in section of the extruded plastic rectangular member shown in FIG. 1.
FIG. 7. An extruded plastic member similar to that shown in FIG. 1 only circular in cross section.
FIG. 8. A section through FIG. 7 on the plane 8--8.
FIG. 9 is a perspective view of an extruded plastic rectangular member with the two wires being placed in slots located at the interior corners of the rectangular member.
FIG. 10 is a section of FIG. 9 on the plane 8--8.
FIG. 11 is similar to FIG. 10 but shows a variation wherein there is a wire only in the center of the upper and lower portions of the extruded plastic member.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to the drawings and in particular to FIG. 1, 10 is a typical fence rail provided with end caps 11 and 12. Each of the end caps has holes near the corners thereof through which the wires are shown extending. The holes in end cap 12 are shown at 12a, 12b, 12c and 12d. The holes in end cap 11 are shown at 11a, 11b, 11c and 11d. (See FIG. 5).
One wire 13 extends through the two holes 11a and 11b in the end cap 11 (see FIG. 5), and through the corresponding two holes 12a and 12b in the end cap 12 and the two ends of wire 13 are joined together by connector 14 with the wire 13 under tension. Galvanized steel 1/8" high tension wire has been found to be very satisfactory. Similarly, wire 15 is led through the holes 12c and 12d in end cap 12 and the corresponding holes 11c and 11d in end cap 11 and the two ends of wire 15 are joined together by connector 16 with the wire 15 under tension. Also shown in FIG. 2 are the wire 15 and the connector 16.
Referring now to FIG. 5, it will be seen that the wire 15 extends through hole 11c in the end cap 11 down along the back of the end cap 11 and back through the hole 11d in the end cap 11.
FIG. 3 shows the end cap 12 and the two ends of wire 13 and the two ends of wire 15 being joined together by connectors 14 and 16 respectively after having been placed under tension.
In FIG. 4, the wires 13 and 15 are shown traversing the interior length of the fence rail 10 adjacent the four interior corners of the fence rail 10.
FIG. 5 is a view of the cap 11 and it will be seen that wire 13 enters through holes 11a and 11b in end cap 11 and the wire 15 enters the end cap 11 through holes 11c and 11d and then both wires return through the interior length of the fence rail 10 to the corresponding holes in end cap 12.
FIG. 6 is a section of the fence rail 10 showing the wire 13 entering holes 11a and 11b in end cap 11, traversing the length of the interior of the fence rail 10 and exiting end cap 12 through holes 12a and 12b and being held together under tension by connector 14. Wire 15 is similarly positioned on the opposite side of fence rail 10.
FIG. 7 shows a variation of the fence rail 10, namely fence rail 10a, which is circular in cross section and also provided with end caps provided with corresponding holes and wires 13a and 15a and connectors 14a and 16a functioning in the same fashion as is the case with the fence rail 10 shown in FIG. 1. FIG. 8 is a sectional view of rail 10a on the plane of 8--8 as shown in FIG. 7 with the two wires 13a and 15a shown running the interior length of the rail 10a.
FIG. 9 shows a variation of the fence rail 10 which has been provided on the each interior corner extending the length of the fence rail with openings 17a, b, c and d of a size adapted to hold the wires 13 and 15. This is a very convenient way in which to place the wires in the proper location in the fence rail so as to enable deflection to be minimized under load.
Referring to FIG. 10 which is a section on the plane 10--10 of FIG. 9, the openings 17a, b, c and d are shown as are the wires 13 and 15.
While this has been shown for an extruded plastic member such as a vinyl fence railing which is rectangular in cross section, it is obvious that comparable openings could be employed to modify the variations shown in FIGS. 7 and 8 which are circular in cross section.
While the invention has been shown with the connectors 14 and 16 only at one end of the fence rail 10 it's obvious that similar connectors can be employed at the opposite end of the fence rail if desired. In that case two wires are substituted for a continuous wire.
Referring to FIG. 11 there is shown an alternative structure in which a single wire rather than a pair of wires 18a at the top and 18b at the top are used which may be enclosed in openings 19a and 19b, similar to openings 17a, b, c and d. Wires 18a and 18b extend the length of the fence rail.
By constructing a hollow plastic member which is greater in length than in width with these internal wire supports under tension significant deflection of the member when a load is placed between the ends thereof is avoided and the member will return to within acceptable limits of its original position.
A standard 8 foot length of vinyl fence rail was supported at each end and a 500 lb. weight was placed on the fence rail at its center. The fence rail was distorted several feet and did not return to its original shape. An 8' long length of vinyl fence rail made in accordance with the present invention was supported at each end and a 500 pound weight was placed at the center thereof. The fence rail was only distorted 5" and when the weight was removed it recovered to within 1/2" of its original position.
While this invention has been shown and described with respect to a detailed embodiment thereof, it will be understood by those skilled in the art that various changes in form and detail thereof may be made without departing from the scope of the claims of the invention.