US1631449A - Reamer drill bit - Google Patents

Description

June

D. ALFORD REAMER DRILL BIT Filed 1926' Q Patented June 7, 1927.

I UNITED STATES 1,631,449 PATENT caries.

i ALLEN 1:. mean, or'mmras, mixes.

DRILL an";

Application flled Deceinber e, 1920. serial Na-152,747.

This invention relates to improvements in reamer drill bits and in such connection it relates more particularly to the novel arrangement and construction thereof.

Heretofore in rotary drills it was possible at times to underream the hole made by the bit by means of reamers which were pro jecte by gravity from the drill stock or body. In such underreamers, however, as

the reamer body was droppedin the drill body the reamers were PI'OJQClIBd a short and defined distance beyond the drill.

It is of importance in drilling when the cap rock is reached that the hole be enlarged into a well-defined chamber and it is to accomplish this purpose as well asto provide a tool for underreaming that? the present invention has been devised.

In the present invention two reamer bits are provided, each bit being ivoted at its inner end to a cylindrical hea ,carried by the drill body, which head is recessed to receive the bits. The head is so arranged that it will move downward in the drill body by means of water, steam or air pressure, forcing the reamer bits outward at a more or less angular relationship to the drill body, and a coiled spring, co-acting with the pressure, is adapted, when the pressure is released, to cause the bits to resume a normal position in the head and drill body. Suitable means are employed to gauge the reamer bits to the distance t ey are to project outward before the pressure is applied.

'With the above and other minor,objects in View, the invention will be better andmore clearly understood by reference to the following description, in connection with the accompanying drawings, and wherein:

Figure 1 is a view partly in section and partly in side elevation of a reamer drill embodying the main features of the invention.

Figure 2 is a vertical sectional view, i1- e5 lustrating more in detail the position of the spring and bits when the latter are fully extended.

Figures 3, 4, 5, 6 and 7 are cross-sectional views taken on lines 33, 4-4, 5-5, 6-6

,60 and 7-7, respectively, of Figure 1; and

Figure 8 is an elevational view of a plug.

In the arrangement and construction of the invention there is provided a drill body 1 which is hollowedor interiorly chambered,

at the lower end being screw-threaded to r eof which 5 indicates the top, and having a circular opening V 5* for the admission of ceive a drill bit 2. Inside'the drill body 1 are arranged the reamer bits 3-3, which are pivoted by a pin 4 to a hollow slidable head water under pressure, the bottom or lower end indicated at 6' formed integral with a pin 7. This head is recessed to receive the reamer bits 3--3, the walls of the recess being shown at 5". The top 5 of the head and its bottom or lower end 6 have projections 8--8 formed integral therewith and fitting into a complemental groove or channel 9 and wherein the head rides when the bits are advanced outward, so that the reamer bits when projected thron h the slots 3 will not rotate within the dri 1 body, but will turn with said bodyin reaming out the hole.

Referring again to the pin 4, to which the reamer bits are pivoted, it will be seen by reference to Figure 4 that these bits overlap each other, and the pin whenfully advanced is enclosed in the drill body 1, its. ends supported by the recess walls 5". When so advanced the holes in the drill body into which the pin 4 is inserted are closed or plugged by screws 4 and 4. Arranged to. encircle the pin 7 is a coil spring 10, one end resting against the under side of the hollow head, the other end of .the spring encircling a pin 11 and supported by the head 12 of the pin, which is screw threaded so that it may be advanced upward in the drill body 1. Between the head 12 of the pin 11 and the drill bit 2 is a space 13 to allow of suflicient room for the-head 12 of the pin 11 to be moved up or down in the drill body 1.

To set or' gauge the distance the reamer bits 33 are to project through the slots 3, there .is provided a key 14' threaded to receiv a circular nut 15. The key 14 is placed on the to 5 of the head and the key turned, forcing the head downward,- the reamer bits being projected outward through the slots o 3, the desired distance. The head 12'of the pin 11 is then advanced until the pins 11 and 7 meet.. The key 14 is then removed.

When water-pressure is used the water-is forced downward through the drill stem 16, 105 passing through the opening 5*.and thence throu h the openings 6* and 12 to clean the, mud roin around the spring, etc. Water can thus pass through the openin s, yet the pressure is sufficient when thus imlnished I10 I an opening in its to tohold the pin 7 and the pin 11 in contact and thus retain the bits in a rigid position 'for underreaming. When air or steam resslida-ble head within the drill body, reamer bits carried by saidhead, said head having and a series of-openings in its lower en to admit water under pressure, the lower end of said head formed integrally with a downwardly projecting" in, a movable nut with an upwardly proecting pin below the upper pin, and a coil sipring encircling and resting on the shoulers of said pins.

2. A reamer drill comprising 'a hollow body, a drill bit on the end thereof, a slidable recessed head within said hollow body carrying reamer hits, a coil spring below said head supported b a nut and pm, erforations through sai head, nut and '11 bit for the admission of water under pressure to thereby contract said spring and project the reamer bitsoutwardlyat right angles to the drill body, and means for closing the opening in the top of said head when applying steam or air ressure.

In testimony whereo I aflix my si nature.

ALLEN D. ALF RD.

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