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Publication numberUS336187 A
Publication typeGrant
Publication dateFeb 16, 1886
Publication numberUS 336187 A, US 336187A, US-A-336187, US336187 A, US336187A
InventorsWillet O. Wells
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 336187 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

W. o. WELLS.


' Patented Feb. 16, 1886.


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SPECIFICATION forming part of Letters Patent No 336,187, dated February 16,1856.

Application filed April 10, 15485.

To all whom it may concern,.-

Beit known that I, W'rLLE'r C. WELLS, a citizen of the United States, residing at Tiffin, in the county of Seneca and State of Ohio, have invent-ed a new and useful Improvement in Vell-Drills, of which the following is a specification.

My invention relates to that class of reciprocating drills which by repeated blows excavate the well. Its special object is to provide for the automatic expansion and contraction of the cutting-wings of the drill while securing a rigid support of those wings in their expanded position during the operation of drilling.

In the accompanying drawings, Figure l shows an elevation of my drill at work as seen from the side; Fig. A2, an elevation of the same as seen from the edge; Fig. 3, a vertical section taken transversely of Fig. l, Fig. 4., a ver tical section taken transversely of Fig. 2,show ingthewingsin their expanded position. Fig. 5 shows the cutting-wings partly contracted or forced together as the operation of withdrawing the drill through the tube begins. Fig. 6 shows their position when the drill has passed wit-hin the tube and the contraction of the wings has become complete.

E is a hollow drill-stock, having openings C communicating therewith.

AD is the drill head or bit.

B B are the expans-ible cutting-wings, pivoted at m.

A is the casing or tubing through which the drill passes.

G is the shank having valve II.

The screw-thread for uniting the shank to the drill-stock is shown at g.

F is a key or socket plate held in position by pins or rivets L L.

I is the vertical opening in the drill-stock.

J is the slot in the drill-head for the reception of the expansible wings.

R R R represent compressible springs, serving to hold the wings normally in their expanded position.

n n are arms or bars pivoted to the wing at p p and connected bypivotal joint at r, forniing togetheratoggle-joint. -r is a trippingpin below this joint, and S S are shoulders on the key or socket plate.

rI`he operation is as follows: The springs Serial No. 161,862. (Model.)

cause the wings to assume the position shown in Fig. 4, when the toggle-joint, being straightened, affords a perfectly rigid resistance to direct lateral p1essure,\vliile the shoulders at S afford a rigid resistance to any upward strain, the toggle and shoulder together serving to lock the wings rigidly against all strains which they have to resist in the operation of drilling. Vhen the drill is to be withdrawn, either wholly or partially, the sloping outer faces of the wings are by the act of withdraw ing it brought in contact with the outer tubing, which gives a diagonal downward and inward pressure upon them, forcing the toggle joint against the trip K, whereby it is upset and the wings pass iirst to the position shown in Fig. 5, and then to that shown in Fig. 6, enabling the drill to be withdrawn through the tube. A single expanding-wing may be used in some cases, the jointed support therefor being attached to a fixed part of the drill.

Instead of makinga toggle-joint, as shown, a pivoted bar or bars may be substituted, providing such bar or bars be so fulcrumed as to present rigid resistance to lateral pressure.

I prefer to use for the spring which is to expand the wings a flexible or compressible packing which serves at the same time to exclude detritus or sediment from the interior ofthe drill; but it is obvious that other kinds of springs may be substituted and secure other advantages of my invention, and that many other modications in the construction of the parts may be made without departing from the essence of my invention. v

l. In a well-drill, two expansible wings having rigid vertical supports in bearings,in which they oscillate, and united by a toggle-joint, by which they are rigidly supported against lateral pressure when out of contact with the drilling-tube, substantially as described.

2. In combination with the expansible wing of a drill, connected by a toggle-j oint and rigidly supported against vertical strains,a spring interposed between said wings and serving to force said wing or wings apart, for the purpose described.

3. In combination with a drill, an expansible wing formed with a projecting boss tting int-o a corresponding socket-bearing, in which it oscillates, and provided with a shoulder IOO which rigidly abuts against a corresponding shoulder when the wing is in its expanded position, for the purpose described.

4. The combination ofthe wing or wings having a projecting boss or bearing-surface with a key or removable socket-plate having corresponding faces, in which said bosses are received and confined and in which they oscillate, substantially as described.

5. The combination of the wings having abutting shoulders, a toggle-joint uniting` the wings, and an expansible spring serving to press the wings apart, for the purpose described.

6. The combination of an oscillating wing rigidly supported at its bearings against ver tical strains, a bar pivotally connected to said wing below the center of oscillation of' said wing and rigidly supporting the saine in the expanded position when said wings are out of -contact with the tube, and a trip mounted on the fixed part of said drill for upsetting said joint When said wing is contracted,.s.ibstau` tially for the purpose described.

7. The combination,with the pivoted wings united by a toggle-joint, of a trip mounted on the fixed part of said drill, whereby thejoint is automatically upset by the downward pressure of said wings forcing the toggle -joint against said trip when the wings are drawn upward through the tube, for the purpose described.

8. In combination with an expansible wing or Wings, an elastic packing serving at once to force the wings to the expanded position and to exclude detritus or sediment from the interior, substantially as described.

9. The Wings pivoted and connected by a togglejoint normally held straight by means of outwardly-pressing springs interposed between and bearing against said wings, as described, When said Wings have rigid vertical support at their bearings and sloping outer faces, whereby a diagonal pressure is applied through their contact with the interior tubing when being withdrawn, for the purpose described.

l0. An oscillating wing for a well-drill, having projected from the upper part thereof a a boss adapted to oscillate in a corresponding socket, and abutting shoulder adjacentto said boss, and a cutting-edge at the lower end thereof, substantially as described.

l1. The combination of socket-plate, wings having proj ecting bosses fitting into the sockets of said plate .and oscillating therein, and shoulders abutting against the shoulders of said plate, a jointed connection between the wiDgS,Whereby they are rigidly supported against lateral strains, a trip for upsetting the joint, and spring for restoring the wings to their expanded position, substantially as de-

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Cooperative ClassificationE21B10/34