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Publication numberUS2543861 A
Publication typeGrant
Publication dateMar 6, 1951
Filing dateFeb 12, 1948
Priority dateFeb 12, 1948
Publication numberUS 2543861 A, US 2543861A, US-A-2543861, US2543861 A, US2543861A
InventorsMader Harry J
Original AssigneeMader Harry J
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Plug insert bit for core drills
US 2543861 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

March 6, 1951 H. J. MADER PLUG INSERT BIT FOR CORE DRILLS Filed Feb. 12, 1948 INVENTOR ATTORNEYS Patented Mar. 6, 1 951 UNITED STATES PATENT- OFFICE PLUG INSERT BIT FOR CORE DRILLS Harry J. Mader, Jerome, Ariz.

Application February 12, 1948, Serial No. 7,811

This invention relates to improvements in plug insert bits for core drills.

An object of the invention is to provide an improved plug insert bit for use with core drills.

Another object of the invention is to provide a detachable plug insert bit for use with core drills and having a flat face in which diamonds 1 Claim. (Cl. 25573) or other cuttin stones or materials are embedded.

A further object of the invention is provide an improved replaceable plug insert bit for use with core drills, the same having a fiat face in which diamonds or other cutting stones or materials are embedded, and having oppositely disposed longitudinally extending water grooves formed therein.

A still further object of the invention is to provide an improved plug insert bit for use with core drills, the same bein supported by a cross pin in retracted position to produce a concave type bit or in advanced position to produce a pilot type bit.

Another object of the invention is to provide an improved plug insert bit having a flat cutting surface in which diamonds or other cuttin stones or materials are embedded, said bit being highly efficient in operation and relatively inexpensive to manufacture and produce.

Other objects will appear as the description proceeds.

In the accompanying drawings which form a part of this application, I

Figure 1 is a bottom view of a core drill bit with the improved plug insert bit supported therein in advance of the core drill bit to produce a pilot type bit.

Fig. 2 is a sectional view taken on the line 2-2 of Fig.1.

Fig. 3 is a bottom view of a core drill bit with the improved plug insert bit supported therein in retracted position to produce a concave type bit.

Fig. 4 is a sectional view taken on the line 44 of Fig. 3.

Like characters of reference are used throughout the following specification and the accompanying drawings to designate corresponding parts.

In carryin out the invention, there is shown and provided a core drill bit I having an upwardly extending reduced portion 2 which is externally threaded as at 3 for connection with the usual drill rod (not shown). Diamonds or other cutting stones or materials 4 are embedded in the lower annular end 5 of the core drill bit I.

The improved plug insert bit 6 is of a size to fit snugly within the core drill bit I, with the lower end of the insert bit 6 extending in advance of or below the lower end of said core drill bit The flat lower face I of the insert bit 6 will support diamonds or other cutting stones or materials 3 which also are disposed a slight way up the side of the insert bit 6.

Oppositely disposed parallel Water grooves 9 and H! are formed longitudinally in the plug insert bit 6, and are angled inwardly as at I l and I2 adjacent their lower ends to discharge through the face 1 of the insert bit 6.

Aligned transversely extending bores l3 and I4 will be formed through the core drill bit I and the plu insert bit 6, and will receive the cross pin 15 for securin said plug insert bit 6 within the core drill bit I. The ends of the pin l5 will be caulked in or otherwise secured. Diametrically opposed water grooves I6 will be formed across the cutting end 5 of the core drill bit I.

In Figs. 3 and 4, a similar core drill bit I is provided, the same being reduced on the upper end 2 and externally threaded as at 3, and having diametrically opposed water grooves l6 formed across the cutting end 5 in which the diamonds 4 or other cutting stones or materials are embedded.

The plug insert bit 6 is supported in retracted position within the core drill bit I by mean of the cross pin l5 which is inserted through the aligned bores I3 and I4 through the core drill bit I and the plug insert bit 6. Diamonds 8 or other cutting stones or materials are embedded in the lower face 7 of the plug insert bit 6 to provide a concave type bit.

Oppositely disposed parallel water grooves 9 and ID are formed in the plug insert bit 6 and extend straight down to discharge through the face 1 of the plug insert bit 6.

From the foregoing description, it will be seen thatin the event the plug insertbit 6 wears out before the core drill l, a new plug insert bit 6 may replace the worn out one, and vice versa,

should the core drill bit I wear out first, a new Having thus described my invention, what I claim as new and desire to secure by Letters'Patent of the United States is:

A drilling tool, comprising a tubular member having a reduced threaded portion adjacent to the drilling end thereof providing an enlarged drillin end having a diamond embedded cutting surface, an insert bit fitted within the tubular member in close engagement therewith, said bit having a diamond embedded cutting end extended beyond the cutting surface of the tubular member, said tubular member and bit having aligning transversely disposed openings, a cross pin permanently secured in the aligning openings securing the bit Within the tubular member, and said bit having longitudinally extended water grooves providing discharge passageways, the discharge ends of the grooves being directed inwardly towards each other.

HARRY J. MADER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 58,924 Webster Oct. 16, 1866 1,746,455 Woodruff et a1. Feb. 11, 1930 1,878,292 Pivoto Sept. 20, 1932 1,940,996 Carr Dec. 26, 1933 2,053,801 Mitchell Sept. 8, 1936 2,056,319 Harrington Oct. 6, 1936 2,081,302 Jarvis May 25, 1937 2,256,092 Koebel et al Sept. 16, 1941 FOREIGN PATENTS Number Country Date 5,942 Great Britain Sept. 1, 1910 472,587 Great Britain Sept. 27, 1937

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US58924 *Oct 16, 1866 Improvement in tube-sheet cutters
US1746455 *Jul 8, 1929Feb 11, 1930Storts Edward DDrill bit
US1878292 *Mar 13, 1931Sep 20, 1932Pivoto Felix LDrill bit
US1940996 *Mar 26, 1931Dec 26, 1933Carr John DDrill
US2053801 *May 29, 1934Sep 8, 1936Chicago Pneumatic Tool CoRotary drilling bit
US2056319 *Dec 11, 1933Oct 6, 1936Reed Roller Bit CoDrill bit
US2081302 *Nov 9, 1936May 25, 1937Jarvis Frank ERotary face bit
US2256092 *Apr 6, 1940Sep 16, 1941J K Smit & Sons IncDiamond bit
GB472587A * Title not available
GB191005942A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3736995 *Jun 16, 1972Jun 5, 1973Salter ADiamond-impregnated masonry bit with radially-stepped cutting faces
US4574895 *Dec 29, 1983Mar 11, 1986Hughes Tool Company - UsaSolid head bit with tungsten carbide central core
US5351765 *Aug 31, 1993Oct 4, 1994Baroid Technology, Inc.Coring assembly and method
US5810102 *Aug 23, 1996Sep 22, 1998Stewart; Gary L.Reversible bit assembly
US5887655 *Jan 30, 1997Mar 30, 1999Weatherford/Lamb, IncWellbore milling and drilling
US5887668 *Apr 2, 1997Mar 30, 1999Weatherford/Lamb, Inc.Wellbore milling-- drilling
US5996571 *Feb 1, 1996Dec 7, 1999Diamond Products Joint VentureDiamond core drill bit
US6024168 *Oct 31, 1997Feb 15, 2000Weatherford/Lamb, Inc.Wellborne mills & methods
US6112812 *Jan 6, 1998Sep 5, 2000Weatherford/Lamb, Inc.Wellbore milling method
Classifications
U.S. Classification175/405.1, 175/404, 175/385
International ClassificationE21B10/04, E21B10/62, E21B10/48, E21B10/46, E21B10/26, E21B10/00, E21B10/60
Cooperative ClassificationE21B10/60, E21B10/04, E21B10/26, E21B10/48, E21B10/62
European ClassificationE21B10/48, E21B10/04, E21B10/26, E21B10/62, E21B10/60