US1305792A - Post-hole digger - Google Patents

Description

R. C. FRASER.

POST HOLEDIGGER.

APPLICATION men ocT. I5. 1918.

1,305,792. Patented June 3, 1919.

ii'nirnn s rarns PATENT curios.

RICHARD CLAYTON FRASER, OF CENTRAL CITY, COLORADO, ASSIGNOR OF ONE-THIRD TO WILLIAM R. FRASER, OF DURANGO, COLORADO.

POST-HOLE means. 7

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To all whom it may concern:

Be it known that I, RICHARD O. FRASER, a citizen of the United States, residing at Central City, in the county of Gilpin and State of Colorado, have invented certain new and useful Improvements in Post-Hole Diggers, and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to earth boring tools and more particularly to tools in the nature ofpost hole diggers. 7

'It is one of the objects of the present, invention to provide for improvements in post hole diggers which will render instruments of this type'more easily operable and more rapidly driven and thus to increase the general utility oftheimplement; Another object of the invention is'to provide a device of the character which is simple in construction, substantial in its parts and inexpensive and durable.

With these and other objects in view as will be rendered manifest in the following specification, the invention consists in the construction, the combination, and in details and in organization of the parts as more fully hereinafter described, relative to the embodiment of the invention illustrated in the accompanying drawings, in which,

Figure 1 is a perspective view looking toward the bottom end of the implement, and

Fig. 2 is a vertical, through the implement.

The digger comprises a cylindrical shell of suitable dimension and kind and thickness of material being illustrated at 2 in the drawing, the upper end of the cylinder being open as at 3, while its lower end is termi nated in the form of a helical edge 4, the helix making one complete turn about a central rod 5 extending through the sleeve longitudinal section or shell 2. The upper end of the shell is shiftably connected to the center rod 5, preferably by means of a split gas pipe'6, the lower end of which is bifurcated or divided into a number of prongs 7, which are riveted or otherwise fastened securely to the adjacent end of the shell as at 8. While the sleeve or pipe 6 is slidable on the rod 5, it is rotative by the rod by suitable means Specification of Letters Patent. Patented June 3, 1919 Application filed October 15, 1918. Serial No. 258,769.

herein shown as comprising a pin 5 engaging the walls ofthe split pipe.

The center rod 5 may be in the form of a plece of gas pipe or other tubing having at its lower end a tapering point 10 and at the upper end of the rod there is connected the threaded cross connection 11, into which may be inserted the handles or levers 12, which may be of ordinary pipe form thus permitting cheapness of construction.

An important feature of the present invention resides in the provision of the cutting means, which means not only provides for the cutting of the earth but also which ex: tends upwardly into the interior of the shell or cylinder tube.- This cutting means comprises a helix of a' suitable number of turns and which is coordinate with the helical edge 4 of the cylinder or casing 2, and to which the perimeter of the lower portion of the helix is secured as by means of lugs 15, a suitable number of which are bent up from the edge of the helix 16, this latter being shown as riveted as at 17 to the central rod 5. The shell 2 has a cutting edge 18 ex tending longitudinally thereof and of a length substantially equal to the pitch between adjacent edgesof the blades of the helix, the edge 18 and the radial edge 19 of the helix being perpendicular to one another or in a common plane so that they co-act in cutting operation. Adjacent to its radial edge the cutter is provided with a lip 20 extendingdownwardly substantially parallel to the axis of the rod 5 the function of which is to make a circular cut during operation.

By extending the length of the helix up substantially into the shell tube it is found that the cutting operation by the device is rendered easier and that the implement can be operated more rapidly than other forms of post diggers.

What I claim is:

1. An earth boring tool comprising a cylindrical shell open at its top and having its lower edge forming a helix of one turn with a straight longitudinal lip connecting the terminals of the helical edge and forming a vertical cutter of that part of the shell; a sleeve attached to the upper end of the shell and coaxial therewith; a center rod on which the sleeve is slidable without rotation; and an integral, multiturn helical cutter attached to the lower end of the rod, the pitch of the helix being coordinate with that of the end of the shell so that the first turn forms a bottom for the shell while the upper portion of the helix projects well up into the shell to facilitate cutting and carryin of soil; the helix having a leading radiacutting edge; and means for holding the bottom edge of the shell.

2. An earth boring tool comprising a cylindrical shell open at its top and having its lower edge forming a helix of one turn with a straight longitudinal lip connecting the terminals of the helical edge and forming a vertical cutter of that part of the shell; a sleeve attached to the upper end of the shell and coaxial therewith; a center rod on which the sleeve is slidable without rotation; and an integral, multi-turn helical cutter attached to the lower end of the rod, the rod having its lower end shaped to form a fishtail cutter the pitch of the helix being coordinate with that of the end of .the shell so that the first turn forms a bottom for the shell while the upper portion of the helix projects well up into the shell to facilitate cutting and carrying of soil; the helix having a leading radial cutting edge; and means for holding the bottom edge of the shell.

3. An earth boring tool comprising a cylindrical shell open at its top and having its lower edge forming a helix of one turn with a straight longitudinal lip connecting the terminals of the helical edge and forming a vertical cutter of that part of the shell; a sleeve attached to the upper end of the shell and coaxial therewith; a center rod on which the sleeve is slidable without rotation; and an integral multi-turn helical cutter attached to the lOWer end of the rod, the pitch of the helix being coordinate with that of the end of the shell so that the first turn forms a bottom for the shell while the upper portion of the helix projects well up into the shell to facilitate cutting and carrying of soil; the helix having a leading radial cut ting edge; and means for holding the bottom edge of the shell, the advance'end of the helical cutter having a down-turned circle cutting lip disposed adjacent to the cutting edge of the shell.

4. An earth boring tool comprising a cylindrical shell open at its top and having its lower edge forming a helix of one turn with a straight longitudinal lip connecting the terminals of the helical edge and forming a vertical cutter of that part of the shell; a sleeve attached to the upper end of the shell and coaxial therewith; a center rod on Which the sleeve is slidable without rotation; and an integral, multi-turn helical cutter attached to the lower end of the rod, the pitch of the helix being cooordinate with that of the end of the shell so that the first turn forms a bottom for the shell while the upper portion of the helix projects well up into the shell to facilitate cutting and carrying of soil; the helix having a leading radial cutting edge; and means for holding the bottom edge of the shell the sleeve being longitudi nally split, and a pin in the shank to spline the parts for sliding action.

In testimony whereof I afi'ix my signature.

RICHARD CLAYTON FRASER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Ifatents, Washington, D. G.

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