US2017834A - Drill bit - Google Patents

Description

A. P. HUMMEL DRILU BIT Filed March 4, 1935 A TTORNEY Patented oci. 1s, 193s UNITED STATES PATENT OFFICE The invention relates to well drilling tools and" more especially to a drilling bit of the type wherein a continuous stream of water is injected into the hole being drilled.

The lprimary object of the invention is the provision of a bit of this character, wherein the flow hole for the water has therein aresilient bushing to reduce materially the friction created by passage of the water and slush under pressure through the hole in the body of the bit and thus to increase the longevity and consequent usefulness of the tool.

' Another object of the invention is the provision of a bit of this character, wherein the same has the water passages therein lined with a wear resisting material. of elastic kind, such as rubber, which through its use` pressure fromthe pump will remove any accumulationof material which may become wedged in the passage and also functions to. hold the lining material rmly -in applied position in the passage in the bit.

A further object of the invention isthe provision of a bit of this character, wherein the lining is interchangeable and 'replaceable when the same becomes worn by the contact of sand and other cutting substances passing at high velocity through the iow hole therefor and under pump pressure. A still further obiect'of the invention is the provision of a bit of this character, which is simple in construction, thoroughly reliable and efIlcient in its operation, strong, durable. and inexpensive to manufacture.

With these and other objects in view, the invention consists in the features of construction,

combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawing, which discloses the preferred embodiment of the invention and pointed out in the clain` hereunto appended.

In theI accompanying drawing:

Figure 1 is a fragmentary vertical sectional view through a drill bit constructed in accordance with the invention.

Figure 2 is an enlarged sectional view throughthe lining for the ow hole in the bit.

Figure 3 is a perspective view of the bushing sponding parts throughout the several views in the drawing.

Referring to the drawing in detail, particularly Figures 1 to 3, inclusive, there is shown in Figure 1 an improvedV type of-bit, the body I0 being 5 formed with a shoulder I I set at an angle rto allow for rapid circulation of water and to direct the same upward past the shank I2 without interference thereby to retard its progress. The bit is further provided with a cutting blade I3 so dis- 10 posed as to insure maximum cutting eciency.

It is to be understood, however, that the co'nstruct-ion of the bit shown and specically described does not in any way restrict the use ofthe invention to be presently referred to. as the in 15 vention is adapted for applicationto. any type of earth boring tool employing the circulation of fluid as a. lubricating medium.

The shank has provided therein' a cavity I4 from which'leads a hole or water course I5 which 20 is trained downwardly and outwardly from the bottom of this cavity to a proper point for 4discharging uid on the operative surface of the blade I3. When the water course I5 becomes plugged by accumulation of substances therein it is obviously necessary to withdraw`the blt from the hole being bored .with the added disadvantage of having to lift the column of water entrapped in the drillstem assembly and requiring that such water be released. To reduce the likelihood of plugging'the water course I5 in the bit the present invention has been created and comprises a copper coated steel sleeve I 6 of a cross sectional diameter corresponding to that ofthe water course I5 for snug fitting theref in and this sleeve is preferably longitudinallyl slitted at I'I which slits extend through one end and terminate short of the other end which carries an outturned rim or nange I8. The rim or flange I8 in its entirety is embedded in a rubber lining I9 which extends inside of the sleeve I6 for the full length thereof and the same is vulcanized therewith. This lining of elastic material avoids the wearing away of the water course I5 when the sleeve is iitted therein.

The rim orange end I8 of the sleeve constitutes an abutment against the wall of the cavity It so as to avoid the working of the sleeve It through the course I5 when the iluid ilows through the latter, under high pressure and the 50v slitting of the sleeve I6 permits the expanding of the sleeve by the high pressure exerted against the same so that the sleeve. will firmly bind in the course I5 and be held in place.

In Figure 3- of the drawing there is showna 55 Um the sleeve :s carrying, the elastic lining :c

has the anged end 21 overlapped by a. rim 2l on the lining 26. i

A The bushing could be constructed without the use of the copper covered steel sleeve around which the rubber is iltted as it is contemplated for the useof steel spring mesh wire, either brass or copper covered as a bushing.

What is claimed is: l

In a drill bit. having a. water ow hole therel through, an elastic tubular bushing fitting said hole and including a metallic sleeve removed from the wall of the bore of said bushing.

ARTHUR P. HUMMEL.

Images