Patent Publication Number: US-6662515-B2

Title: Synthetic wood post cap

Description:
This Application claims the benefit of U.S. Provisional Application No. 60/193,711, filed Mar. 31, 2000. The entirety of U.S. Provisional Application No. 60/193,711 is hereby incorporated by reference. 
    
    
     BACKGROUND AND SUMMARY OF THE INVENTION 
     The present invention relates generally to posts and, more particularly, to a synthetic wood cap that is adapted to fit a post. A preferred use of the cap is to fit a wood or synthetic wood deck post. However, it is believed that the patentability of the present invention is not dependent on the composition of the cap or the use, type, or composition of the post. The cap of the present invention may be made from a variety of materials, and it may be used to fit any suitable post regardless of its type, use, or composition. 
     Posts serve a variety of purposes. For example, a post may be used as a support in a deck railing system, a fencing system, or other types of barrier systems. On the other hand, a post may be a solitary member that is used as a support, e.g., a mailbox post, or that is used to block or define a path. In addition, it should be recognized that posts serve many other different uses. 
     In a typical use of a post, one end of the post is secured to a foundation, e.g., a deck or the ground, and the other end of the post is elevated above the foundation. The end of the post that is elevated above the foundation is usually visible. Accordingly, it is desired to make that end of the post aesthetically pleasing. For this purpose, the end of the post can be shaped or finished such that it is in desired condition. Alternatively, it is desirable to place a cap over the end of the post to provide a desired visual appearance. In this manner, a cap can significantly limit the time and expense of shaping and finishing the end of the post. 
     A cap can also provide other benefits. The end of the post is susceptible to damage, particularly if it is made from wood or synthetic wood. For example, rainwater can settle on the end of the post and cause it to deteriorate if it is uncovered. A cap can substantially eliminate this type of damage. 
     A cap can also prevent damage to hollow posts. An extruded, synthetic wood post may be hollow. As a result of being hollow, rainwater, insects, and other debris can enter the hollow end of the post if it is not covered. This can result in various types of damage to the post. Accordingly, it is desirable to fit a cap on the end of a hollow post to keep out rainwater, insects, and other debris. 
     The present invention provides a cap that fulfills some or all of these needs. In particular, the present invention provides a cap that is adapted to fit securely on a post. A preferred embodiment of the cap is comprised of a synthetic wood composition that has been injection molded to obtain the desired shape and characteristics. The cap is preferably secured to the post by an adhesive and/or spacers. 
     In addition to the novel features and advantages mentioned above, other objects and advantages of the present invention will be readily apparent from the following descriptions of the drawings and preferred embodiments. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a side elevation view of a preferred embodiment of a cap of the present invention installed on a deck post of a deck railing system; 
     FIG. 2 is a perspective view showing how another preferred embodiment of a cap of the present invention is fitted on a deck post; 
     FIG. 3 is a side elevation view of still another preferred embodiment of a cap of the present invention; and 
     FIG. 4 is a bottom plan view of the cap of FIG.  3 . 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENT(S) 
     The present invention is directed primarily to a synthetic wood post cap. The present invention also includes systems that use the post cap as well as methods of manufacturing and using the post cap. A preferred implementation of the post cap is illustrated in FIG.  1 . FIG. 1 is a partial view of an exemplary deck railing system  10 . The deck railing system  10  extends around a deck  12 . The deck railing system  10  preferably includes a plurality of deck posts  14  and rails  16 . The deck posts  14  may be hollow or solid. The rails  16  extend between the deck posts  14 . The deck posts  14  and rails  16  may be comprised of a synthetic wood composition. For example, the deck posts  14  and rails  16  may be made from a TIMBERTECH® composition made by TimberTech Limited of Columbus, Ohio. However, it should be recognized that the deck posts  14  and rails  16  may be made from any other suitable material such as, but not limited to, metal, wood, or other plastic formulations. 
     The deck railing system  10  also includes a plurality of caps  18  of the present invention. In this example, a preferred embodiment of a cap  18  is fitted on each deck post  14 . In particular, a cap  18  fits around the outside of the deck post  14  regardless of whether the deck post  14  is hollow or solid. However, in alternative embodiments, it should be recognized that a cap may fit around the inside of a hollow deck post. 
     It is preferred that the cap  18  fits securely on the end of the deck post  14 . A secure fit preferably prevents the cap  18  from being knocked off of the deck post  14 . In addition, it preferably keeps rainwater, insects, and other debris from entering the inside of a hollow deck post  14 , settling on top of a solid deck post  14 , or invading the top of a solid deck post  14 . Any appropriate means may be used to secure the cap  18  to the deck post  14 . For example, nails, screws, pins, clamps, and/or other appropriate mechanical fastening means may be used to secure the cap  18  to the deck post  14 . Alternatively, an adhesive such as, but not limited to, an epoxy may be used alone or in conjunction with mechanical fastening means to secure the cap  18  to the deck post  14 . It should also be understood that one or more spacers may be used if the cap  18  does not fit snugly around the deck post  14 . The spacer(s) may be used alone or in conjunction with an adhesive and/or mechanical fastening means to fit the cap  18  on the deck post  14 . In particular, a spacer may be comprised of one or more pieces of material that are adapted to be positioned and/or wedged between the cap  18  and the deck post  14  in order to achieve a desired fit. The spacer may be comprised of any appropriate material such as, but not limited to, wood, synthetic wood, plastic, metal, or any other material that is suitable for this purpose. 
     FIG. 2 illustrates how a preferred embodiment of the cap  20  of the present invention is fitted on one embodiment of a deck post  22 . In this example, the deck post  22  is comprised of an interior wood post  24  which is surrounded by multiple pieces of synthetic wood cladding  26 . Any suitable, desired, or conventional synthetic wood composition may be used to make the cladding  26 . An example of a synthetic wood composition is a TIMBERTECH® composition made by TimberTech Limited of Columbus, Ohio. However, it should be recognized that, in alternative embodiments, the cladding  26  may be made of other materials including, but not limited to, wood, metal, plastic, or other similar, suitable, or conventional materials. An adhesive may be distributed on the interior of the cap  20  and/or on the top of the wood post  24  and/or on the top portions of the pieces of synthetic wood cladding  26 . The cap  20  is then moved in the direction indicated by the arrows  28  and fitted on the deck post  22 . 
     FIGS. 3 and 4 are detailed drawings of another preferred embodiment of a cap  30  of the present invention. Specifically, FIG. 3 is a side elevation view of the cap  30 . In FIG. 3, the broken lines indicate the interior of the cap  30  which is not visible from this viewing angle. FIG. 4, on the other hand, is a bottom plan view of the cap  30 . 
     Referring to FIGS. 3 and 4, the cap  30  includes a roof portion  32  and a wall portion  34 . In this example, the roof portion  32  has a generally pyramidal shape to help prevent rain and other debris from collecting on the top of the cap  30 . However, it should be recognized that the roof portion  32  may have any desired shape. The wall portion  34  extends from the roof portion  32 , and it is preferably shaped such that it provides a desired fit around the lateral sides of a post. An outer edge portion  38  of the roof portion  32  may extend outwardly beyond the wall portion  34  to promote drainage of rainwater away from the sides of the underlying post. The cap  30  also preferably includes one or more support members  36  that are adapted to support the roof portion  32 . In this example, the four support members  36  are interconnected, and each extends from and bisects a respective triangular section of the roof portion  32 . When the cap  30  is fitted on a deck post, it is preferred that the support members  36  rest against the top of the deck post in order to provide optimum support of the roof portion  32 . Moreover, it enables an adhesive to secure the support members  36  to the top of the deck post. 
     A cap of the present invention may be comprised of a synthetic wood composition. Any desired synthetic wood compositions and foamed polymer compositions may be used in the present invention. For instance, the materials used to make the cap of the present invention may be virgin or recycled materials including, but not limited to, cellulosic fillers, polymers, plastics, thermoplastics, rubber, inorganic fillers, cross-linking agents, lubricants, process aids, stabilizers, accelerators, inhibitors, enhancers, compatibilizers, blowing agents, foaming agents, thermosetting materials, and other similar, suitable, or conventional materials. Examples of cellulosic fillers include sawdust, newspapers, alfalfa, wheat pulp, wood chips, wood fibers, wood particles, ground wood, wood flour, wood flakes, wood veneers, wood laminates, paper, cardboard, straw, cotton, rice hulls, coconut shells, peanut shells, bagass, plant fibers, bamboo fiber, palm fiber, kenaf, and other similar, suitable, or conventional materials. Examples of polymers include multilayer films, high density polyethylene (HDPE), polypropylene, polyvinyl chloride (PVC), low density polyethylene (LDPE), chlorinated polyvinyl chloride (CPVC), acrylonitrile butadiene styrene (ABS), ethyl-vinyl acetate (EVA), polystyrene, other similar copolymers, other similar, suitable, or conventional plastic materials, and formulations that incorporate any of the aforementioned polymers. Examples of inorganic fillers include talc, calcium carbonate, kaolin clay, magnesium oxide, titanium dioxide, silica, mica, barium sulfate, acrylics, and other similar, suitable, or conventional materials. Examples of thermosetting materials include polyurethanes, such as isocyanates, phenolic resins, unsaturated polyesters, epoxy resins, and other similar, suitable, or conventional materials. Combinations of the aforementioned materials are also examples of thermosetting materials. Examples of lubricants include zinc stearate, calcium stearate, esters, amide wax, paraffin wax, ethylene bis-stearamide, and other similar, suitable, or conventional materials. Examples of stabilizers include tin stabilizers, lead and metal soaps such as barium, calcium, and zinc, and other similar, suitable, or conventional materials. In addition, examples of process aids include acrylic modifiers and other similar, suitable, or conventional materials. 
     Examples of synthetic wood compositions include, but are not limited to, plastic/cellulosic filler compositions, polymer/cellulosic filler compositions, thermosetting/cellulosic filler compositions, thermoplastic/cellulosic filler compositions, rubber/cellulosic filler compositions, foamed synthetic wood compositions, inorganic-filled plastic compositions, and other synthetic wood compositions that are known now or in the future. An example of a synthetic wood composition is a TIMBERTECH® composition made by TimberTech Limited of Columbus, Ohio. For example, the composition of the cap is preferably comprised of wood flour in the amount of 30-55% by weight, zinc stearate in the amount of 0-10% by weight, ethylene bis stearamide (EBS) in the amount of 0-10% by weight, talc in the amount of 5-20% by weight, mica in the amount of 0-15% by weight, and high density polyethylene in the amount of 25-60% by weight. More preferably, the composition of the cap is comprised of wood flour in the amount of 35-45% by weight, zinc stearate in the amount of 0-5% by weight, ethylene Bis Stearamide (EBS) in the amount of 0-5% by weight, talc in the amount of 10-20% by weight, mica in the amount of 0-10% by weight, and high density polyethylene in the amount of 30-40% by weight. The blending process of the present invention is preferably comprised of drying the wood flour to about 2% or less moisture content by weight. Thereafter, the other ingredients are preferably added and then blended with the wood flour for about 5 minutes. The inventors have made the surprising discovery that the resulting composition can be injection molded at a suitable temperature in the shape of the present invention. 
     In alternative embodiments of the present invention, the cap can be made from other materials and compositions. For example, the cap of the present invention can be made from other known and/or conventional synthetic wood compositions. Also, the cap can be made from other plastic formulations and/or materials, e.g., wood or metal. 
     It should also be recognized that the manufacturing method is not limited to injection molding. The cap may be manufactured by any method that is suitable to obtain the desired characteristics of the cap. 
     The preferred embodiments herein disclosed are not intended to be exhaustive or to unnecessarily limit the scope of the invention. The preferred embodiments were chosen and described in order to explain the principles of the present invention so that others skilled in the art may practice the invention. Having shown and described preferred embodiments of the present invention, those skilled in the art will realize that many variations and modifications may be made to affect the described invention. Many of those variations and modifications will provide the same result and fall within the spirit of the claimed invention. It is the intention, therefore, to limit the invention only as indicated by the scope of the claims.