US460444A

US460444A - Reamer

Info

Publication number: US460444A
Authority: US
Publication date: 1891-09-29
Anticipated expiration: 1908-09-29

Description

(No Model.)

W. W. MOGREGORY. REAMER.

Patented Sept. 29,1891.

WITNESSES A TTORNE Y8 the same.

UNITED STATEs PATENT OFFICE.

. \VILLIAM YVHITNEY MCGREGORY, OF PASADENA, CALIFORNIA.

REAM ER.

SPECIFICATION forming part of Letters Patent No. 460,444, dated September 29, 1891. Application filed November 11, 1890. Serial No. 371,029. (No model.)

T0 atZZ whom it may concern:

Be it known that I, WILLIAM WHITNEY MCGREGORY, of Pasadena, in the county of Los Angeles and State of California, have invented a new andImproved Reamer, of which the following is a full, clear, and exact description. I

The invention relates to drilling-tools for boring wells, &c.; and its object is to provide a new and improved reamer which is simple and durable in construction and readily expands to ream out the hole in the ground or rock made by the drilling-tool to permit a convenient lowering of the well pipes or casing.

The invention consists of certain parts and details and combinations of the same, as will be hereinafter fully described, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of the improvement. Fig. 2 is a sectional side elevation-of Fig. 3 is a transverse section of the same, and Fig. 4 is a sectional plan view of the same on the line w m of Fig. 2.

The improved reamer is provided with a head A, from which projects upwardly a shank B, adapted to be secured to the drill-rod in a similar manner as drilling-tools. From the lower end of the head A projects downwardly a tongue 0, terminating in a fork consisting of the arms D, arranged parallel with each other and each provided with an elongated aperture D, through which passes a correspondingly-shaped boltE, adapted to be locked in place by pins E. The bolt E passes through elongated apertures F, formed in the lugs F, passing between the arms D of the fork. The lugs F are formed on the inside of the cutting-blades G of suitable length, the cutting-blades G having their lower ends pressed apart by springs H, preferably made in the shape shown in Figs. 1 and 3that is, semi-ellipticaltheir backs resting one on the other. The upper ends of the springs H are secured by pins or rivets to the cuttingblades G. The upper ends of the cuttingblades G are provided with shoulders adapted to rest on the bottom sides of the head A.

The operation is as follows: When a hole has been bored in the ground or rock below the pipes or'casing already in the ground, the drilling-tool is removed from the drillrod and the reamer is secured to the same. The operator, in order to insert the reamer into the pipes, presses the lower ends of the cutting-blades G toward each other, so as to permit the reamer to enter the pipes or casing. The drill-rods are then lowered in the usual manner, and when the reamer passes below the lower endof the pipes or casing the springs H press the cutting-blades G outward, and the drill-rods, on being operated up and down, cause a consequent cutting by the cutting-blades in the ground or rock below the pipes or casing. As the cutting-blades are expanded after leaving the lower ends of the pipes, the hole is reamed out, so that the pipes or casing can readily be lowered by driving the same downward, as now practiced.

It will be seen that the cutting-blades are prevented from springing together at their free ends on account of the head A striking against the ends of the blades G, thus making the lower ends of the cutting-blades G rigid. The openings D in the arms D are made elongated, so as to allow the head A to strike against the ends of the blades G.

The openings in the lugs F are made sufficiently large to permit the blades G to spring together, so as'the reainer may be lowered in the well and pulled out again.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. The cornbinati0n,with the head, of the two opposed reaming-blades pivoted thereon and extending below the lower end of the head, and a longitudinally-extending platespring secured on the inner side of each blade below the head and pivot and bowed inward into contact with each other and holding the blades normally apart at their lower ends, substantially as shown and described.

2. The combination, with the head A, having a central tongue 0, terminating in a fork D, the members of which are at right angles to the tongue and slotted longitudinally, of the reaming-blades G G, provided on their inner sides between their ends with longitudinally-extending lugs F F, overlapping within the fork D and having registered openings in line with the fork-slots, the pivot-bolt E, passing through said slots and openings, and springs secured to the blades below theirlugs and pressing them apart, the inner faces of the upper ends of the blades resting against opposite sides of the tongue C, the head A being adapted to simultaneously engage the upper extremities of said blades, substantially as set forth.

3. The combination,with the head A, having a tongue 0 and a fork D, the members of which are at right angles to the tongue, of the two blades hearing at their upper ends on the opposite sides of the tongue and pr0- vided on their innerfaces between their ends with overlapping longitudinally-extending lugs, and a flattened bolt or pivot connecting said lugs and having a sliding connection with the said fork to permit the head to engage the upper extremities of the blades, and springs pressing the lower ends of the blades apart, substantially as set forth.

WILLIAM WHITNEY MGGREGORY.

\Vitnesses W. G. MoGREeoRY, S. B. MCGREGORY.