US1967391A - Ground anchor - Google Patents

Description

J. BLACKBURN GROUND ANCHOR July 24, 1934.A

Filed OCT.. 6, 1932 A TTORNE Y.

Patented July 24, 1934 GROUND ANCHOR Jasper Blackburn, Webster Groves, Mo.

Application October 6, 1932, Serial No. 636,461

1 Claim.

This invention relates to ground anchors for telegraph poles or the like.

The primary object of the invention is to provide a unitary or one-piece anchor of the formation of a hollow cone, which when seated in the ground will tend to hold its seat through the operation of suction within the hollow cone of the anchor, while the angular disposition of the walls of the cone relative to the axis thereof and relative to the side walls `of the hole in which the anchor is seated, will, under any straight-out pull upon the anchor, tend to deflect any stone or rock piled in the holeupon the anchor, radially outward against the sides of the hole, thus locking the anchor against withdrawal.

Another object is to provide an anchor Vof the kind referred to, consisting of a one-piece, hollow cone including a hub at its apex, an annular flange or foot portion extended flatly outward around its base, and a plurality of flat ribs outstanding upon the outer sides of its walls and extending from the hub to the foot flange in a spoke-like relation, whereby small rocks may become locked in between the adjacent ribs and other rocks being piled thereupon and becoming wedged between the locked rocks and the adjacent side walls of the hole in which the anchor is seated, the anchor is effectively locked against withdrawal under stresses imposed upon the attached anchor rod.

With these and such further and additionaly objects and advantages in View as may be developed in the course of the following speciiication, at

tention is directed 'to the accompanying drawing as constituting a part of the specification, the same embodying a practical form of my invention, and wherein Figure 1 is a side elevation of my improved form of anchor as in actual use, an anchor rod being shown attached thereto, and the ground within which is formed the hole for the seating of' the anchor being shown in section.

Figure 2 is a plan view of the anchor, the attached anchor rod being shown in section.

Figure 3 is a side elevation of the anchor.

Figure 4 is a longitudinal transverse section through the anchor.

Figure 5 is a fragmental, longitudinal transverse section through the upper part of the anchor.

In the form of structure shown in the drawing, the invention comprises an anchor designated generally at l, the same being made in the form of a hollow cone and including a hub 2 at its apex, an annular flange or foot portion 3 ex- (Cl. 18S-90) tended atly outward around the base of the cone with the extended plane thereof cutting perpendicularly the axis of the cone anchor, and a plurality of flat and relatively long ribs 4 outstanding upon the outer faces or sides of its integrally and conically formed walls 5. Intermediate the lower outer ends of the ribs 4, there are formed an equal number of smaller, relatively short ribs 4a. The hub 2 is tapped axially as shown at 6 for the engagement of the threaded -65 end of an anchor rod 7, in conventional manner, or a square recess 8 may be formed at the inner side of the hub for the reception of a nut 9, the end ofthe rod being then extended through and turned into the nut.

In use, the anchor l is seated in the bottom of the ground hole 10 and the rod 7 being screwed home, seals the hollow within the cone, and this hollow tends to form a suction resisting any pull outward upon the anchor rod. When the rocks l are piled in the hole upon the anchor, the smaller ones 11 will lock in between the adjacent ribs 4 and 4a, and other rocks l2 being then thrown into the hole, they will become braced between the locked rocks l1 and the outer walls 13 of the 89 hole l0, so that any outward or longitudinal pull upon the rod '7 will result in a counteracting thrust, radially and angularly outward against the side walls of the hole, thus staying any movement of the anchor and rod.

The integral and closed form of the cone anchor prevents dirt and smaller pebbles from falling or passing through from top to bottom as with other forms. The flat, radial, upstanding ribs serve also to strengthen the cone, so that thinner cone walls l may be used, requiring less metal. The at, annular foot portion provides a broad sealing base for seating in the dirt at the bottom of the hole, thus supporting the suction within the cone. The upstanding ribs also cooperate Awith the coneshaped formation of the relatively thin walls thereof by affording reinforcing connection and strengthening elements between the hub and annular foot portion. The hollow cone being provided for lesseningthe amount of metal and to provide a suction, it is obvious that supporting elements are necessary for the hub, to prevent same from cracking loose from the cone under stresses. The ribs supply such supporting elements. While I have herein described a certain specific manner and method of constructing and assembling the elements of my invention, it is understood that I may vary from the same in minor details, not departing from the spirit of my invenbase of the cone portion and presenting an anchoring surface perpendicular to the axis of the cone portion, and a plurality of relatively thin, flat supporting and strengthening ribs radially outstanding from the outer sides of the Walls of the cone portion and connecting and supporting the hub and foot portion in a spoke-like relation, thus rendering possible the use of the said thin, flat annular foot portion, as aforesaid.

JASPER BLACKBURN.

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