US414411A - Expanding drill-blade - Google Patents

Description

' A'rniv'r tries,

UNITED S'rArE-e TOLLEF HERBERG, OF IIENDRUM, MINNESOTA.

EXPANDING DRlLL-BLADE.

SPECIFICATION forming part of Letters Patent No. 414,411, dated November 5, 1889.

Application filed March 27, 1889. Serial No. 304,974. (No model.)

To a/ZZ whom it may cmwern: end of the latch is projected normally out- Be it known that I, TOLLEF UE'RBERG, a Ward, so that its lower end Will be held in citizen of the United States, residing at Henengagement with the drill-blades bya spring 55 drum, in the county of Norman and State of Q, arranged in the recess L and bearing Minnesota, have invented a new and useful against the latch. The upper end of the Expanding Drill-Blade, of which the followlatch is of a convex form, as shown in the flg iS a Specification. drawings, so that it Will be casily operated by My invention relates to improvenients in the lower end of the casing, as will be pres- 6o cxpanding drill-blades; and it consists in cerently more particularly described. Io tain novel features hereinafter described and The construction and arrangement of the claimed. parts of my device being thus made known, In the accompan'ying drawings, Figure l is the operation of the same will, it is thought, a side view of my improved device. Fig. 2 is be readily understood. 65

a vertical section of the same. Fig. 3 is a lVhen the device is to be lowered to the horizontal section. Fg. is a perspective bottom of awell or other opening, the latch is view of one of the blades. disengaged from the drill-blades, so as to al- Referring to the drawings by letter, A deslow the same to drop by reason of their weight. ignates the drill-rod, which may be either The ribs and grooves will direct the drill- 7o solid or tubular, aspreferred, and has its blades inward, so that they will occupy less 2o lower end bifurcated, thereby providing the room, and consequently can be easily passed arms B, and through the said arms I form a downward through the casing to the bottom horizontal perforation O, as shown. On their of the well, while the pin l prevents the blades inner opposing sides the arms B are provided falling from the drill-rod. The device is then 7 5 With the reversely-inclined shoulders D, and lowered in the casing, and when the drillat the base of said shoulders with the grooves blades strike the bottom of the well they will E, which extend the entire length of said be forced upward, and by reason of the inclishoulders and follow the Outline thereof. n-ation of the grooves and ribs will be directed IThe drill-blades F are inounted between the outward and expanded. The drill-blades will 8o arms B, and are provided with the inclined be held in their expanded position by the 3o ribs G on their sides, at their upper ends, latoh automatically engagingthe notches in adapted to engage the grooves E and slide their upper ends, as Will be readilyY undertherein. The drill-blades are further prostood. Then the drilling has been completed vided with the inclined slots H near their upthe drill is lifted from the well and the blades 85 per ends, and the pin I, secured in the openwill be thrown inward, so as to pass easily up ings C in the drill-rod, passes through the the casing in the following manner: As the said slot-s. drill-rod is raised, the convex end of the latch The drill-blades are provided on their outer will be brought against the end of the casing, sides with the projeotions J, having the aband Will be thereby pressed inward, and the 9o rupt shoulders K at their upper ends adapted lower end of the latch is thereby withdrawn 4o to engage with the lower end of the drill-rod from engagement with the drill-blades, so and thereby limit the upward movement of that the same Will be free to move. The the blades, and the lower ends of the blades blades after being released have a tendency and of the offsets J are sharpened, so that as to fall by reason of their weight, and this 95 the drill-rod is' rotated the blades will cut the tendency Will be accelerated by the upper ground, as will be readily understood. ends of the blades striking against the end of The drill-rod is provided in its outer side, 'the casing as the drill-rod is raised. The near its lower end, with areeess L, and alatch blades will thus be thrown inward and Will M is pivotally secured in said recess and has pass easily through the casing. Ioo its lower end bent inward to form a hook N, It will be seen from the fore-going descripwhich projects through an opening O in the tion that I have provided a very simple and drill-rod to engage a notch or notches P in the efficient drill in which the blades will be seupper ends of the drill-blades. The upper curely locked in their expanded position, so

as to cut a large opening, and will be automatically released from their expanded position When the device is raised. The several parts of the device are all protected against injury and are simple in their construction.

Havng thus described my invention,what I claim, and desire to secure by Letters Patent, 1s-

l. The combination, With the drill-rod, of the drill-blades mounted therein' and provided on their outer sides With the offsets J, having the abrupt shoulders K, adapted to impinge against the end of the drill-rod, and a latch mounted on the drill-rod and adapted to engage the drill-blades, as set forth.

2. The combination of the drill-rod provided at its loWer end With the arms B, having the transverse perforations C and 'the' inelined grooves E in their inner faces, the drill-blades arranged between the arms B and provided with the nolined slots H, and the inclined ribs G, engaging the grooves E,

the pin inserted through the perforations 0,'

4presence of two Witnesses.

TOLLEF HERBERG. WVitnesses:

A. L. GERNON, THoMAs PEDERsoN.

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