US2472120A - Explosively actuated tool - Google Patents

Explosively actuated tool Download PDF

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Publication number
US2472120A
US2472120A US56693344A US2472120A US 2472120 A US2472120 A US 2472120A US 56693344 A US56693344 A US 56693344A US 2472120 A US2472120 A US 2472120A
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Prior art keywords
rod
cup member
tool
portion
soil
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Expired - Lifetime
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Ivester R Murphy
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Ivester R Murphy
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/26Drilling without earth removal, e.g. with self-propelled burrowing devices
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/007Drilling by use of explosives

Description

June 7, 1949. 1. R. MURPHY EXPLOSIVELY ACTUATED TOOL Filed Dec. 6. i944 Snow 1 to:

Patented June 7, 1949 UNITED STATES EATENT FFICE (Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) 2 Claims.

The invention described and claimed herein may be manufactured and used by or for the Government for governmental purposes, without payment to me of any royalty thereon.

This invention relates to tools actuated by explosive means and more particularly to apparatus of this character particularly adapted for use in penetrating hard surfaces, as, for example, hard soil or shale.

Equipment used heretofore in working soil preparatory to installing roads or placing poles has been found ineffective when the soil is very hard. For example, earth augers are either ineffective or very slow when employed in hard soil and are not adapted for use by troops in field operations.

It is the general object of this invention to provide an improved explosively actuated tool which is particularly adapted for boring holes in hard soil.

Another object of this invention is to provide a tool operated. by the force of a detonating wave generated by an explosive charge to drive the tool into the ground which may thereafter be withdrawn from the soil, placed at another location, and readily reloaded.

Another object of this invention is to provide an explosively actuated tool having a detonating chamber formed with a large upper portion and a reduced lower portion, the large upper portion being provided with an opening adapted to admit a propellent charge and a mass of tamping material to the chamber and release combustion gases therefrom, and the reduced lower portion being adapted to function as an expansion chamber for the combustion gases.

Still another object of this invention is to provide an explosively actuated tool wherein the amount or density of the tamping material may be varied to control the depth of pentration of the tool.

A further object of this invention is to provide an explosively actuated tool including a drill point which is adapted to be detachably connected selectively to either a starting drive rod or a driving rod leaving a chamber at its free end to receive a propellent charge whereby the drilling direction may be controlled.

A still further object of this invention is to provide an explosively actuated tool comprising a cup member adapted to receive a propellent charge, a driving rod and a separable drill point wherein the drill point has a larger diameter than the driving rod to permit ready withdrawal of the rod from the body penetrated by the tool.

Other objects will be apparent from the following description of the invention and the accompanying drawings in which:

Figure l is an elevational View with parts removed of an explosively actuated tool constructed in accordance with the principles of this invention;

Figure 2 is a longitudinal sectional view showing in enlarged detail the upper portion of the tool which contains the detonating chamber;

Figure 3 is a longitudinal sectional View showing in enlarged detail the lower portion of the tool with the drill point attached thereto;

Figure 4 is an elevational view showing an extension rod;

Figure 5 is an elevational view, partly in section, showing the propellent charge for the tool; and

Figure 6 is an elevational view of a starting rod for setting the drill point in the body to be penetrated.

Referring to Figures 1, 2 and 3, the explosively actuated tool includes a drive rod IEI, provided at its uppermost end with a threaded portion H and at its lowermost end with a reduced portion I2. The upper end of the rod in has a flared portion ltd adjacent the threaded portion II which provides a horizontal face or shoulder. A cup member 13 having a tapered lower portion I4 provided with a longitudinal internally threaded recess I5 is adapted to engage the threaded portion 1 l of the drive rod Ill. The upper portion of the cup member I3 is provided with a longitudinal recess l6 which is restricted near its lowermost portion to form a shoulder IT. A pair of diametrically opposed openings |8-l8 are formed in the walls of the cup member l3 which are adapted to receive a detachable handle 26. The handle 25, which may also be used as a starting tool as described below, enables the operator to rotate the cup member 13 and engage or disengage the threaded portion of the recess I5 and the threaded portion II of the drive rod Ill. The tapered portion M- of the cup l3 and the flared portion Illa, of the rod ID are comple mentary and thus, when the horizontal faces or shoulders of these portions are in contact, the cup l3 and the rod I form an uninterrupted substantially conical surface. This arrangement enable the operator to determine by inspection whether the cup member I3 and the drive rod [0 are completely engaged. A separable drill point l9 having a cylindrical upper portion and conical pointed lower portion is provided with a longitudinal recess 20, which is adapted to receive the reduced portion l2 of the lowermost end of the drive rod Ill. The cylindrical upper portion of the drill point I9 is larger in cross section than the drive rod l0 and thus drills an opening in the soil or other surface larger than the rod I0 when forced therein by the latter.

The longitudinal recess 15 in the cup member 13 is adapted to receive a propellent charge shown in Figure 5, and thus forms a detonating chamber. The propellent charge may consist of black powder or any other commercially available explosive 2! and is employed in a container 22 formed of light metal or: other waterproof material. The container 22 which is preferably cylindrically shaped, is adapted to fit loosely in the recess l with the peripheral edge of the bottom thereof resting on the shoulder H. The top of the container 22 is provided with a frangible disc 23 which may be perforated to permit a fuze 24 to be inserted through the opening and placed in the explosive 2i. When the propellent charge container 22 is positioned in the recess 55 of the cup member :3, the restricted portion of the recess it below the shoulder ll forms an expansion chamber for the combustion gases generated by the burning explosive. The charge is exploded by igniting the fuze 24 and the detonating wave generated moves downward in the detonating chamber, striking the bottom of the recess l6 and driving the cup member if downwardly. The cup member 53 transmits the explosive impact to the drive rod IE3 through the shoulder formed by the flared portion 18a and in turn the separable drill point [9 is forced. into the soil. Unless the cup member 13 and the drive rod is are properly connected with the horizontal face or shoulder of the tapered portion It in contact with the horizontal face or shoulder of the flared portion lOa, the threads on the portion I I will be sheared by the impact of the explosion. The operator must therefore observe whether the complementary portions of the cup !3 and the rod l9 are engaged to provide the uninterrupted substantially conical surface described before igniting the fuze 24. The force of the detonating wave generated by the exploding charge exerted on the driving rod is may be controlled by covering the propellent charge container 22 in the cup member [3 with tamping material 25 such as sand, clay or other soil. The camping material 25 may be dropped into the cup member 23 by gravity and, depending upon the amount and nature of the soil used, the driving rod Ii: will penetrate the soil with the drill point E9 to a predetermined depth. If it is desired to force the drivin rod it further into the ground, the tamping material may be tamped in the cup member #3 thus increasing the density of the tamping.

The cup member l3 and the driving rod I0 secured thereto may be withdrawn from the earth after penetration has been accomplished by detonating the explosive material 2 i. Ordinarily this operation may be carried out easily since the drill point I9 is slightly larger than the driving rod and the hole drilled by the point will not engage the rod l0 tightly. If the force of the explosion causes the drive rod II) to penetrate the soil to too great a depth, the cup member I3 is disengaged from the threaded portion H, a tapped extension rod lflb, which is shown in Figure 4, secured to the threaded portion II and the drive rod then withdrawn from the soil. The drill point NJ is separated from drive rod Hi When the latter is withdrawn and remains in the soil. The opening formed in the soil may be enlarged by inserting a prime cord charge therein and exploding the charge.

In Figure 6, there is shown a combined starting drive rod and handle 26 provided at its uppermost end with an enlarged head 21 and at its lowermost end with a reduced portion 28, The reduced portion 28 is adapted to fit into the recess 20 of the drill point 19. As described above, the rod 26 may be inserted in the openings |8I8 to provide a handle for attaching the cup member 53 to the drive rod H]. In operation, as a starting tool, the reduced portion 28 is inserted in the recess 28 of the drill point 19 and force applied by strikin the head 21 to drive the drill point into the soil, usually a depth of about one foot. In this manner the drilling direction of the drill point Iii may be controlled. Thus started, the tool 2G is withdrawn and the reduced portion l 2 of the drive rod H) is inserted in the recess 20 of the (hill point is. The cup member I3 is attached to the drive rod it, the propellent charge with the fare 2 3 attached thereto inserted in the recess l6 and camping placed therein. The fuze 24 is ignited and the explosive material 2| detonated forcing the tool into the soil. The tool may then be withdrawn and inserted in another drill point at another location. If any difi'iculty is encountered in withdrawing the tool from the soil, a rod extractor or any other commercially available apparatus similar to casing extractors employed in the oil industry may be used to withdraw the tool. The tool may thus be used to drill holes in extremely hard soil rapidly, efiieiently and economically.

Having thus described my invention, what I claim as new and wish to secure by Letters Patent is:

1. An explosively actuated earth boring tool comprising, in combination, a driving rod, the driving rod having opposite ends, one of which is a reduced end, and a threaded portion on its opposite end, a drill point removably mounted on the reduced end of the driving rod, a cup member threadedly mounted on the threaded end portion of the dl'iVlng rod, the cup member being of substantially larger diameter than the driving rod and being adapted to receive a propellent charge and a mass of tamping material, the cup member being provided with oppositely disposed holes adapted to receive a handle bar for attaching the cup member to the driving rod, a handle bar in the holes, the said handle bar having a reduced end portion adapted to fit into the drill point and an enlarged end portion adapted to form a driving head, whereby the said handle bar may be used interchangeably as a starting rod and as a handle bar, a propellant charge in the cup member, and means for igniting the propellant charge.

An explosively actuated earth boring tool comprising, in combination, a driving rod, a drill point removably mounted on one end of the driving rod, a cup member mounted on an opposite end of the driving rod, means for detachably mounting the cup member on the driving rod, a handle removably mounted in the cup member for 2,472,120 5 6 attaching the cup member to the driving rod, the REFERENCES CITED handle comprising a bar having an end adapted to be received in the drill point and an enlarged g z fi g fii f i are of record m the driving end, whereby the handle may be used inp terchangeably as a handle and as a startin rod, NITED STATES PATENTS the cup member being adapted to receive an ex- 5 Number Name Date plosive charge, the cup member having an open 49,362 Barnes Aug 15 5 end through which the expl v charge is 1,905,497 Peters Apr 25 1933 ceived and a closed end attached to the driving 2,227,193 i t 1940 rod, and a shoulder on the inner wall of the cup member for retaining the explosive charge and 10 for providing an expansion chamber for products of combustion of the explosive charge.

IVESTER R. MURPHY.

US2472120A 1944-12-06 1944-12-06 Explosively actuated tool Expired - Lifetime US2472120A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717656A (en) * 1951-10-31 1955-09-13 Clyde E Bannister Method and apparatus for use in surveying earth formation by explosion and seismograph
US2774240A (en) * 1951-04-09 1956-12-18 Fur Grundwasserbauten Ag Soil testing apparatus
US2948923A (en) * 1958-06-04 1960-08-16 Rocca Edward W La High pressure, explosive-activated press
US5538090A (en) * 1995-04-10 1996-07-23 Siler; Gary W. Ground probe apparatus
US5950739A (en) * 1997-09-05 1999-09-14 Lafontaine; Stephen J. Earth piercing apparatus
US20050201834A1 (en) * 2004-03-11 2005-09-15 Lafontaine Stephen J. Method and apparatus for installing underground pipe
US20110258857A1 (en) * 2010-04-23 2011-10-27 Shunderson Communications Inc. Motor driven rotational sampling apparatus with removable cutting tools for material collection
US20130118017A1 (en) * 2010-04-30 2013-05-16 Ge Healthcare Bio-Sciences Corp. Motor driven rotational sampling apparatus with removable cutting tools for material collection

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US49362A (en) * 1865-08-15 Improvement in sinking deep-well tubes
US1905497A (en) * 1932-02-05 1933-04-25 Ingersoll Rand Co Working implement for percussive tools
US2227198A (en) * 1937-12-06 1940-12-31 Schlumberger Well Surv Corp Core-taking apparatus and method of exposing cores

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US49362A (en) * 1865-08-15 Improvement in sinking deep-well tubes
US1905497A (en) * 1932-02-05 1933-04-25 Ingersoll Rand Co Working implement for percussive tools
US2227198A (en) * 1937-12-06 1940-12-31 Schlumberger Well Surv Corp Core-taking apparatus and method of exposing cores

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2774240A (en) * 1951-04-09 1956-12-18 Fur Grundwasserbauten Ag Soil testing apparatus
US2717656A (en) * 1951-10-31 1955-09-13 Clyde E Bannister Method and apparatus for use in surveying earth formation by explosion and seismograph
US2948923A (en) * 1958-06-04 1960-08-16 Rocca Edward W La High pressure, explosive-activated press
US5538090A (en) * 1995-04-10 1996-07-23 Siler; Gary W. Ground probe apparatus
US5950739A (en) * 1997-09-05 1999-09-14 Lafontaine; Stephen J. Earth piercing apparatus
US20050201834A1 (en) * 2004-03-11 2005-09-15 Lafontaine Stephen J. Method and apparatus for installing underground pipe
US20110258857A1 (en) * 2010-04-23 2011-10-27 Shunderson Communications Inc. Motor driven rotational sampling apparatus with removable cutting tools for material collection
US20130118017A1 (en) * 2010-04-30 2013-05-16 Ge Healthcare Bio-Sciences Corp. Motor driven rotational sampling apparatus with removable cutting tools for material collection

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