US181983A - Improvement in earth-augers - Google Patents

Description

H. w. PULSE.

EARTH-AUGER. No. 181,983; Patented Sept. 5, 1876'.

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UNITED STATES PATENT O FICE HIBAM W. PULSE, OF WALDRON, INDIANA.

IMPROVEMENT IN EARTH-AUGERS.

Specification forming part of Letters Patent No. 181,983, dated September 5, 1876; application filed March 27, 1876.

To all whom it may concern Be it known that I, HIRAM W. PULSE, of Waldron, Shelby county, Indiana, have invented a new and useful Post-Hole Auger, of which the following is a specification:

My invention relates to improvements in those implements for boring holes in the ground which comprise a gimlet-point, a series of spiral blades, and a cylindrical retainer, all attached to a suitable stem or handle for operating the same; and my improvements consist in means for securing a greater or less protrusion of the gimlet-point, in means for securing a greater or less diameter of the retainer, and in a peculiar form of the retainer and of the cutting-blades in relation thereto.

In the accompanying drawing, Figure 1 represents, by perspective view, a post-hole auger embodying my improvements. Fig. 2 is a detached view of the gimlet-pointand sliding expander, together with one-half of the retaining-cylinder, and one of the cutting or entering blades.

The stem or shaft consists of a pair of bars, A A, united at top to a cross-bar or handle, B, and at bottom to two blades, 0 O, which, collectively, constitute my cylindrical retainer. The blades 0 O overlap, as shown, and their overlapping surfaces are feathered, as indicated, a pin, D, on the inner lap, occupying a slot, E, in the outer lap, so that, while prevented from separation in the radial direction, the two members 0 O are yet capable of being forced apart in direction of their slots. The said receiver is chamfered on the inner portions of its upper and lower margins, as at c and 0, so as to easily cut its way both downward and upward in the ground. Attached either to the bars A A, as shown, or to the members 0 O, or both, are two spiral cutting or entering blades, F F, whose upper ed ges extend partly outside of the receiver, as at f,and partly inside thereof, as at f, and whose lower edges converge in the manner indicated. Interposed between the bars A A is the long, flat, and slotted shank G g of my gimlet H. Fitted to slide upon shank G, so as, if desired, to be forced up between the bars A A, is my wedge-formed expander I, having the series of holes 6 for the reception of a bolt, J, which is passed through holes a in the bars A A, and through the slot g of shank G. This bolt, being made to occupy any desired hole in the expander, operates to retain the blades 0 O to the proper diameter for the hole to be dug. Still another bolt, J, traverses holes a, and the said slot 9 serves to maintain the gimlet in the proper axial position. Nuts K K secure the bolts in their places, and bind the members A A, G, and also the member I, (when the latter is used,) firmly together.

I have described the preferred form of my borer; but it is-evident that the protrudable gimlet may be used in conjunction with a nonexpansible retainer, or an expansible retainer with a fixed gimlet.

I claim as new and of my invention- 1. The combination of split stem A A, duplex receiver 0 O, and attached spiral blades F F with the slidable expander I 2', upon the stem of the gimlet H.

2. The gimlet H, having the slotted shank G g, and capable of being fixed at any desired protrusion by means of the bolts J J.

3. The cylindrical retainer 0 0, having upper and lower cutting-edges c c, for the purpose set forth.

4. The spiral entering-blades F F, whose upper portions are partly within and partly without the retainer, and whose lower edges converge in the manner represented.

In testimony of which invention I hereunto set my hand.

HIRAM W. PULSE. Witnesses:

GEO. H. KNIGHT, J OHN O. HEALY.

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