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  Triple edge trenching axeUSPTO Application #: 20070227050Title: Triple edge trenching axe Abstract: A head for a trenching axe has a central eye portion with an eye opening for joining a handle to extend in a first direction and a height in the first direction, a grubbing blade joined to the eye portion, extending away from the eye portion, and having a cutting edge on an end away from the eye portion, the cutting edge facing in a direction substantially orthogonal to the first direction, a first sidewall joined to the grubbing blade along a portion of a first long edge of the grubbing blade, and a second sidewall joined to the grubbing blade along a portion of a second long edge of the blade, the first and second sidewalls each presenting a sharpened edge at substantially a right angle to the cutting edge of the grubbing blade, and a back wall joined to the grubbing blade and the first and second sidewalls, the sidewalls, the grubbing blade and the back wall forming a pocket open toward the cutting edge of the grubbing blade. (end of abstract)
Agent: Central Coast Patent Agency, Inc - Watsonville, CA, US Inventors: Steve Brown, James Lucy USPTO Applicaton #: 20070227050 - Class: 037347000 (USPTO) Related Patent Categories: Excavating, Ditcher The Patent Description & Claims data below is from USPTO Patent Application 20070227050. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The present application claims priority to provisional application 60/645,717, filed on Jan. 20, 2005, and incorporates all disclosure of the prior application by reference. STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] Not Applicable INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ON A COMPACT DISC [0003] Not Applicable BACKGROUND OF THE INVENTION [0004] 1. Field of the Invention [0005] The present invention relates in general to trenching tools, and more particularly to such tools having an ability for cutting sides of trenches and removing dirt and debris from trenches while forming the trenches. [0006] 2. Background [0007] As demand for construction of all sorts increases, so does demand for efficiency in all aspects of the construction processes. The making of trenches is well-known to be a basic process in construction of many sorts, such as in forming foundations for buildings, and in burying utility cables and pipes of all sorts, for example. [0008] There are three general steps in making a trench. Firstly one must break up the soil in the region of the trench. In the process one must cut sides of the trench, and this process often means cutting roots that may pass across the path of the trench. Lastly it is necessary to remove the loosened soil, rocks, cut roots and other debris from the trench. [0009] Trench construction in the conventional art is done quite often by machines, such a "ditch witches" and back hoes. But there is still in the art a need for manual tools for forming trenches, partly because in some cases direct labor is less expensive than the amortized cost of the machines, for example, and in many cases ditches have to be made where machines cannot reach. [0010] Perhaps the best-known tool for manually forming a trench is a pick axe, which is an axe-like tool with a head and a handle. The head is relatively heavy, and has typically a relatively sharp-pointed end for breaking up soil and a wider blade end for cutting, typically across the direction of trench formation. Quite often more than one tool must be used to effectively form a trench; one to break the ground in the right area, such as a conventional pickaxe, using the sharp end and the wide end at different times, another to cut roots crossing the path of the trench, such as a mutt or a conventional axe, and still another, such as a narrow trench shovel, to remove loose material from the forming trench. [0011] An example of a trenching tool in the conventional art is U.S. design Pat. No. D256322 to inventor Zabarte, which includes a head that has a widened pick blade for loosening compacted soil. The widened blade makes it extremely inefficient to use for removing rocks and stones. On the opposite side of the head from the pick blade there is a wide grubbing blade with a sharpened edge and small sidewalls to assist in capturing and removing debris from the forming trench. There is no specification in this document of the intent of the sidewalls, because the document is a design patent, but the apparently sharpened upper edge of the sidewalls shown would not operate effectively to cut sidewalls of a trench in the application of the grubbing blade by swinging the pick axe in the usual manner. Further the short sidewalls would allow for only small amounts of debris to be removed with every pass. [0012] One reason that a variety of tools have to be used when forming a trench is that there is no single tool that performs all of the necessary functions efficiently. What is therefore needed is a new tool that effectively breaks the soil, cuts sides and crossing roots, and removes loose material as well. The new and unique trenching axe described below in various embodiments of the present invention in enabling detail provides all of these functions. BRIEF SUMMARY OF THE INVENTION [0013] A head for a trenching axe is provided, comprising a central eye portion having an eye opening for joining a handle to extend in a first direction and a height in the first direction, a grubbing blade joined to the eye portion, extending away from the eye portion, and having a cutting edge on an end away from the eye portion, the cutting edge facing in a direction substantially orthogonal to the first direction, a first sidewall joined to the grubbing blade along a portion of a first long edge of the grubbing blade, and a second sidewall joined to the grubbing blade along a portion of a second long edge of the blade, the first and second sidewalls each presenting a sharpened edge at substantially a right angle to the cutting edge of the grubbing blade, and a back wall joined to the grubbing blade and the first and second sidewalls, the sidewalls, the grubbing blade and the back wall forming a pocket open toward the cutting edge of the grubbing blade. [0014] In some embodiments the back wall is a surface of the eye portion, and the sidewalls extend from the grubbing blade to the height of the eye portion. In some other embodiments the back wall is separate from the eye portion. Also in some embodiments the grubbing blade extends from the eye portion further than the extent of the sidewalls from the eye portion. [0015] In some embodiments the back wall is a surface of the eye portion, and the sidewalls extend from the grubbing blade to a height substantially greater than the height of the eye portion. Also in some embodiments each sidewall has a sharpened edge extending from the grubbing blade to the back wall. In many embodiments there is pick end extending from the eye portion similar to that seen on conventional pickaxes. [0016] In another aspect of the invention a trenching axe is provided comprising a head having a central eye portion having an eye opening for joining a handle to extend in a first direction and a height in the first direction, a grubbing blade joined to the eye portion, extending away from the eye portion, and having a cutting edge on an end away from the eye portion, the cutting edge facing in a direction substantially orthogonal to the first direction, a first sidewall joined to the grubbing blade along a portion of a first long edge of the grubbing blade, and a second sidewall joined to the grubbing blade along a portion of a second long edge of the blade, the first and second sidewalls each presenting a sharpened edge at substantially a right angle to the cutting edge of the grubbing blade, and a back wall joined to the grubbing blade and the first and second sidewalls, the sidewalls, the grubbing blade and the back wall forming a pocket open toward the cutting edge of the grubbing blade, and a handle inserted firmly in the eye opening such that the head is joined to the handle at an end of the handle. [0017] In still another aspect a trenching attachment for a pick axe having a grubbing blade is provided, the attachment comprising a first and a second sidewall joined to opposite edges of a mounting plate having the shape and width of the grubbing blade, the first and second sidewalls each having a sharpened edge, a back plate joined to both sidewalls and the mounting plate, and an attachment mechanism for attaching the trenching attachment to a head of a pick axe. BRIEF DESCRIPTION OF THE DRAWING FIGURES [0018] FIG. 1 is a side elevation view of a triple-edge trenching axe in one embodiment of the present invention. Continue reading... Full patent description for Triple edge trenching axe Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Triple edge trenching axe patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. 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