US415610A - Drill - Google Patents

Description

(No Model.)

B. M. BROWN.

DRILL.

Patented Nov. 19, 1889.

MF-villi all" EdwanZJZBrown Wit names N FETEKS Flwibulhngnphur, Washinglon. D- C.

- UNITED STATES PATENT OFFICE.

MORGAN,

KELLY & 00., OF OSAGE, lOlVA.

DRILL.

SPECIFICATION forming part of Letters Patent No. 415,610, dated November. 19, 1889. Application filed August 13, 1889. Serial No. 320,606. (No model.)

To all whom, it may concern:

Be it known that I, EDWARD M. BROWN, a citizen of the United States of America, residing at Nashua, in the county of Chickasaw and State of Iowa, have invented certain new and useful Improvements in Drills; 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, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

My invention has reference to expansion- I 5 drills and it consists in the improvements hereinafter described and set forth, whereby a simple, durable, and eliicient drill is provided that will readily enable tube or case drilling operations to be conveniently carried on.

In the accompanying drawings,forming part of this specification, Figure 1 is a sectional view showing my improved drill within a tube or casing. Fig. 2 is a like view of said drill operating beyond the same. Fig. 3 is a detail perspective view of one of the lower cutters of my improved drill.

The main drill portion A is of somewhat similar form to the well-known constructions and has the drill-edge a located at its lower end, as will be well understood. Said portion is provided with a vertical recess 1), extending through from side to side. 1 ,Within recess 1), at each side, is located an auxiliary bit-section B, which consists of an extended rectangular shank (Z, lying in said recess and pivotally retained therein by means of a bolt 6,

which passes transversely through the portion A, forming the walls of said recess, and through an opening in said shank, the said 40 opening being of slightly-1arger diameter than said bolt, for a purpose to be hereinafter explained. At the lower end and at the outer side said section B carries integrally a cutting portion f, the inner face of which is curved to have the portion taper to its cutting-edge, and also enablejt, when the section B is compressed within its recess, to bear in a correspondingly-shaped recess g, formed in both of the adjacent walls, the width of the portion f being greater than that of its shank, so that it does not enter the shank-recess.

A bent leaf-spring Q has one end secured to the inner vertical edge face, so that its bent free portion 7L will bear against a pin 0, intersecting the lower portion of recess 5, and 5 5 thereby serving to normally throw the lower operating portion of each auxiliary section to the position represented in Fig. 2.

In practice the improved drill is passed down through the tube or casing, and while therein will be compressed, as represented in Fig. 1. N ow, when the drill passes beyond the end of said tube or casing the pressure on the auxiliary sections is removed, and their springs throw them to the position shown in Fig. 2, in which the entire drill can be operated to bore a hole that will be of such diameter as to enable the tube or casing to readily follow. By having thebolt-hole in the shank of slightly-larger diameter than that of the bolt the shank can have a limited vertical movement in its recess, so that its end can bear against the upper wall of said recess, and thereby relieve the bolt of the strain incurred in drilling-an exceedinglyimportant advantage, especially in piercing hard material.

The pressure of the curved inner face of the lower working portion of each auxiliary bit and the corresponding recess in the adjacent walls avoids the clogging and obstruction by clay or dirt, since, as will be noticed, all the vertical faces are inclined or deflected, so that no dirt or clay can lodge thereon.

From the foregoing it will be apparent that my improved drill embodies many important 8 5 advantages over previous constructions, and is decidedly useful and valuable.

I claim- The combination, with the enlarged main drill portion, having a recess, as described, lower cutting-edge and cut-away side walls adjacent thereto, of independent bolts intersecting said recess, auxiliary drill-sections pivoted upon said bolts by having larger openings for the passage of the same and provided 5 with the exterior enlarged cutting portions central stop below said bolts, substantially as set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

EDWARD M. BROWN. VVit-nesses:

J. \V. HOWE, HERVEY CECIL WILBUR.

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