US3574404A - Digging apparatus - Google Patents
Digging apparatus Download PDFInfo
- Publication number
- US3574404A US3574404A US823626A US3574404DA US3574404A US 3574404 A US3574404 A US 3574404A US 823626 A US823626 A US 823626A US 3574404D A US3574404D A US 3574404DA US 3574404 A US3574404 A US 3574404A
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- Prior art keywords
- piston
- combustion chamber
- outlet
- digging
- soil
- Prior art date
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/30—Auxiliary apparatus, e.g. for thawing, cracking, blowing-up, or other preparatory treatment of the soil
- E02F5/32—Rippers
- E02F5/323—Percussion-type rippers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/8883—Using the force of explosions, e.g. by the use of internal combustion engines
Definitions
- the present invention is directed to providing accessories for use with and actuated by the repetitive explosions from the outlet of the combustion chamber by the ignition of fuels therein to loosen and bi'eak up the soil or materials desired to be moved, separately from, prior to, and simultaneously with the displacement of the material by the explosive blasts from the combustion chamber.
- a further object of the present invention is the provision of a door-type piston in the outlet of a combustion chamber hinged at its upper side and having a plurality of ripping teeth on the outside whereby on actuation the material is engaged and loosened by the ripping teeth as well as displaced as the explosive blast moves past the door and out of the explosion chamber outlet.
- a still further object is the provision of a piston door in communication with a combustion chamber which is convexed in cross section to increase the leverage of the explosive force on the door for increased penetration of the digging assembly.
- FIG. 1 is a cross-sectional elevational view, partly schematic, illustrating one embodiment of the present invention prior to an explosion in the combustion chamber
- FIG. 2 is a view similar to FIG. 1, illustrating the apparatus of FIG. I in position afteran explosion in the combustion chamber,
- FIG. 3 is a cross-sectional elevational -view, partly schematic, illustrating the use of a chisel for penetrating hard 2 formations and to provide suitable penetration for positioning of the material displacement explosive outlet, and
- FIG. 4 is a cross-sectional elevational view, partly schematic, illustrating another embodiment of the present invention used for ripping the material.
- the numeral 10 generally indicates the apparatus of the present invention in use in moving a material 1] such as soil and generally includes an explosion cell or combustion chamber 12 which may be periodically moved against the soil 11 to be displaced by a suitable vehicle (not shown) to provide an explosive force through the outlet 13 of the combustion chamber 12 against the soil 11 to displace and move the soil.
- the combustion chamber 12 is charged with a suitable combustion mixture for creating an explosion therein, preferably the chamber l2 is charged with an air/fuel mixture, the air being provided through an air inlet 16, the fuel, preferably a hydrocarbon fuel, being provided through an injection nozzle 20 to provide an air/fuel mixture at the desired pressure and air/fuel mixture ratio.
- Combustion is initiated by a suitable ignition source 22 for creating an explosive force from the combustion chamber outlet 13 which is directed against the soil 11.
- the displacement of the soil 11 by explosions may be more efficiently utilized by the optimum penetration and positioning of the outlet 13 against the soil 11 by providing a digging assembly, particularly in hard rocky soils and other relative adamantine materials.
- the present improvement relates to the use of a digging assembly such as ripping tools or penetration pins or chisels which are driven directly by the explosive pressures from the combustion chamber 12 to loosen and break up the material 11 by the repetitive explosive blasts.
- a plate or door 30 is provided which is pivotally connected at its upper side such as to a pin 32 and is positioned in the outlet 13 of the combustion chamber 12 toform a piston therein.
- a plurality of digging teeth such as ripper teeth 34 are provided on the outside of the door 30 for engagement with the soil 11.
- the lower pressure firings would jar the door 30 and teeth 34 forward one or more times thereby allowing the apparatus 10 to move to a better position with the outlet 13 in full contact against the soil 11 to be displaced so as to be more effective for mass displacement of the material by the explosive exhaust.
- the explosive action acting on the back 36 of plate 30 provides an improved leverage around the pivot pin 32 for increasing the force applied against the material 11 and also for forcing proportionally greater amounts of the explosiveexhaust out near the base or bottom of the plate 30 which also increases the leverage and increases the displacement action on the loosened material.
- a position locking assembly may be provided if desired which may include a second piston 38 in communication with the combustion chamber through a passageway 40 and to which is connected a holding pin 42 which is positioned to extend downwardly and into engagement with the soil or material 11 as the piston 38 is actuated. Pin 42, as best seen in FIG. 2, will thus penetrate hard surfaces and give the ripping door 30 a finn support from which to push.
- Spring 44 is provided to act as a retracting means for the piston 38 after an explosion in which the force behind the piston is vented back to the combustion chamber 12.
- Valve 50 normally is held in a seated position by the spring 52 and performs the function of sealing ofi the combustion chamber 12 from the outlet 13 until a predetermined buildup in the explosive force in the chamber occurs after which the valve 50 opens allowing the high pressure and the temperature gases to move out the outlet 13 and rupture the soil 11.
- the valve 50 also performs an additional function in that it provides a timing means to allow the actuation of the position locking assembly piston 38 at a time prior to the actuation of the plate piston 30 thereby insuring that the apparatus will be secured in place prior to the release of the explosive force through the outlet 13 so as to hold the apparatus 10 in place and insure that the full impact from outlet 13 will be exerted on the soil 11.
- FIG 3 illustrates in this embodiment a piston 56 which is exposed to the combustion chamber 12a drives a penetration rod or chisel 58 outwardly and forwardly of the front point 60 of the combustion chamber for breaking up the material formation adjacent the leading edge 60 to aid in the proper penetration and positioning of the outlet 13a of the combustion chamber to provide a more efficient penetration of the material 11a by the outlet 1130.
- the material displacing apparatus 10b is preferably towed by means of supports 62.
- the outlet 13!; of the combustion chamber 12b is carried above the material 1117 which is to be ripped or broken and excavation of the soil 11b will be performed by any suitable means at a later step in the operation.
- a piston 64 is provided hinged at its upper side to a pin 66 and mounted in the outlet 13b and thus in communication with the repetitive explosions from the combustion chamber 12b and carries a plurality of ripping teeth 68 which are connected to the piston door 64 and extend downwardly and forwardly below the outlet 13!) and into the soil or material 11b for ripping and breaking up the material.
- the apparatus 10b is towed by suitable means (not shown) by the support 62 so that the prime mover is not required to travel over its own spoilage.
- a digging assembly comprising:
- said piston including a door hinged at one side, digging means connected to one side of the piston remote from the combustion chamber and positioned to engage the material, said digging means including a plurality of ripping teeth for penetration and loosening of hard materials, and
- a digging assembly comprising:
- digging means connected to one side of the piston remote from the combustion chamber and positioned to engage the material
- a pin connected to one side of the piston remote from the combustion chamber and positioned to be extended downwardly as the piston is actuated thereby acting to hold the apparatus in position when the digging assembly is actuated.
- valve means sealing off the combustion chamber from the first piston until the second piston has been actuated.
- a digging assembly comprising:
- a door pivotally connected at its upper side and positioned in the outlet of the combustion chamber to form a piston therein
- a plurality of ripper teeth connected to the door on the side remote from combustion chamber for engaging the material to be broken up
- a piston locking assembly including:
- a pin connected to the piston on the side remote from the combustion chamber and positioned to be extended downwardly as the second piston is actuated thereby acting to hold the apparatus in position when the fuel/air mixture is ignited
- valve means sealing off the combustion chamber from the door until the second piston has been actuated.
- a soil ripping assembly comprising:
- the outlet of the combustion chamber being positioned about the soil
- a door pivotally connected at its upper side and positioned in the outlet of the combustion chamber to form a piston therein
- a plurality of ripper teeth connected to said door and extending downwardly and directed forwardly below said outlet and into the soil for loosening the soil
Abstract
An improvement in an apparatus for creating repetitive explosions from an outlet of a combustion chamber by actuating a digging assembly by the explosive pressures to loosen and break up hard materials. The use of piston-driven digging teeth for loosening and breaking up material formations both prior to and simultaneously with material displacement by repetitive explosive blasts. An apparatus positioning locking assembly including a piston-driven pin actuated by the repetitive explosive blasts into position for holding the apparatus in position and which is actuated either prior to or simultaneously with the material displacement blasts and digging assembly actuation.
Description
an: 3 9 574 t M l [72] Inventor Thomas J. Hogan San Antonio, Tex. [21 Appl. No. 823,626 [22] Filed May 12,1969 [45 Patented Apr. 13, 1971 [73] Assignee H. B. Zachry Company San Antonio, Tex.
[54] DIGGING APPARATUS 5 Claims, 4 Drawing Figs.
[52] US. (I 299/37, 299/ l 3 [51] Int. Cl E21c 29/00 [50] Field of Search 299/13, 36, 37, 67, 69, 70, 81; 173/59, 73; 175/93, 14
[56] References Cited UNITED STATES PATENTS 1,840,002 1/1932 Wallis 299/67 2,327,619 8/1943 Brown et al 173/59 2,574,103 11/1951 Hefner 173/59X 3,375,596 4/1968 Bacquie 299/37X 3,461,577 8/1969 Clark et al. 299/13X Primary Examiner-Ernest R. Purser Attorneys-James F. Weiler, Jefferson D. Giller, William A.
Stout, Paul L. De Verter 11, Dudley R. Dobie, Jr. and Henry W. Hope ABSTRACT: An improvement in an apparatus for creating repetitive explosions from an outlet of a combustion chamber I PATENTED APR 1 31971 SHEET 1 OF 2 ffza/nau 4/ hqyaw BY a ada zm A 7' 7' 0/17/75 VJ BACKGROUND OF THE INVENTION US. Pat. No. 3,46 l ,577 entitled Method of and Apparatus for Displacing Materials, discloses the use of combustion heat and pressures from the repetitive firing of a hydrocarbon fuel/air mixture in a combustion chamber for displacing materials by the repetitive explosive blasts. However, rocky or hard soil conditions or materials offer a great deal of resistance to the optimum penetration and positioning of the exhaust outlet of the combustion chamber disclosed in the above mentioned patent application.
SUMMARY The present invention is directed to providing accessories for use with and actuated by the repetitive explosions from the outlet of the combustion chamber by the ignition of fuels therein to loosen and bi'eak up the soil or materials desired to be moved, separately from, prior to, and simultaneously with the displacement of the material by the explosive blasts from the combustion chamber.
It is one object of the present invention to provide in combination with an apparatus for creating repetitive explosions froman outlet of a combustion chamber by the ignition of hydrocarbon fuel/air mixtures, 'a soil digging assembly having a piston in communication with and actuated from the combustion chamber with digging means connected to the piston and positioned to engage the material for breaking up and loosening the material.
A further object of the present invention is the provision of a door-type piston in the outlet of a combustion chamber hinged at its upper side and having a plurality of ripping teeth on the outside whereby on actuation the material is engaged and loosened by the ripping teeth as well as displaced as the explosive blast moves past the door and out of the explosion chamber outlet.
A still further object is the provision of a piston door in communication with a combustion chamber which is convexed in cross section to increase the leverage of the explosive force on the door for increased penetration of the digging assembly.
Yet a still further object of the present invention is the provision of a positioning locking assembly attachment which provides a second piston in communication with the combustion chamber with a holding pin connected to the piston and positioned to be extended downwardly into the material or soil as the second piston is actuated to hold the apparatus in position as the material is broken up or displaced, and also including'means for providing for the actuation of the second piston at a time prior to actuation of the digging or displacement mechanism to hold the entire apparatus firmly in place.
Yet a still further object to the present invention is the provision of a soil ripping assembly or attachment to the outlet of a comhustioncharnber having a door connected at an upper side and positioned in the outlet of the combustion chamber to form a piston therein which is actuated by the repetitive ignition of a hydrocarbon fuel/air mixture in the chamber in which a plurality of ripper teeth are connected to the door and extend downwardly and are directed forwardly below the outlet and into the soil for loosening the soil.
BRIEF DESCRIPTION OF THE DRAWING In the attached drawings, like character references refer to like parts throughout the several views in which:
FIG. 1 is a cross-sectional elevational view, partly schematic, illustrating one embodiment of the present invention prior to an explosion in the combustion chamber,
FIG. 2 is a view similar to FIG. 1, illustrating the apparatus of FIG. I in position afteran explosion in the combustion chamber,
FIG. 3 is a cross-sectional elevational -view, partly schematic, illustrating the use of a chisel for penetrating hard 2 formations and to provide suitable penetration for positioning of the material displacement explosive outlet, and
' FIG. 4 is a cross-sectional elevational view, partly schematic, illustrating another embodiment of the present invention used for ripping the material.
DESCRIPTION OF THE PREFERRED EMBODIMENT By way of example only, the present invention will be described in use for displacing earth and soil, but it is to be understood that the present apparatus may conveniently be used for loosening, breaking up and displacing many and various other types of material.
Referring now to the drawings and particularly to FIGS. 1 and 2, the numeral 10 generally indicates the apparatus of the present invention in use in moving a material 1] such as soil and generally includes an explosion cell or combustion chamber 12 which may be periodically moved against the soil 11 to be displaced by a suitable vehicle (not shown) to provide an explosive force through the outlet 13 of the combustion chamber 12 against the soil 11 to displace and move the soil. The combustion chamber 12 is charged with a suitable combustion mixture for creating an explosion therein, preferably the chamber l2 is charged with an air/fuel mixture, the air being provided through an air inlet 16, the fuel, preferably a hydrocarbon fuel, being provided through an injection nozzle 20 to provide an air/fuel mixture at the desired pressure and air/fuel mixture ratio. Combustion is initiated by a suitable ignition source 22 for creating an explosive force from the combustion chamber outlet 13 which is directed against the soil 11. The foregoing is generally described in the-above-mentioned patent application.
However, the displacement of the soil 11 by explosions may be more efficiently utilized by the optimum penetration and positioning of the outlet 13 against the soil 11 by providing a digging assembly, particularly in hard rocky soils and other relative adamantine materials. The present improvement relates to the use of a digging assembly such as ripping tools or penetration pins or chisels which are driven directly by the explosive pressures from the combustion chamber 12 to loosen and break up the material 11 by the repetitive explosive blasts. Thus, a plate or door 30 is provided which is pivotally connected at its upper side such as to a pin 32 and is positioned in the outlet 13 of the combustion chamber 12 toform a piston therein. A plurality of digging teeth such as ripper teeth 34 are provided on the outside of the door 30 for engagement with the soil 11. Thus, when an explosive blast is applied to the back of the door 30 the door will move out of the outlet 13 moving the teeth 34 against the soil 11 to break up and loosen the soil and the explosive blast explodes out of the outlet 13 and beneath the soil 11 which has been now loosened and broken up for displacement by the exhaust blast, as best seen in FIG. 2. Penetration into hard materials such as hard soils or rock-laden formations may be facilitated by one or more firings of the combustion chamber 12 at lower pressures below which would prove optimum for a mass displacement of the materials. The lower pressure firings would jar the door 30 and teeth 34 forward one or more times thereby allowing the apparatus 10 to move to a better position with the outlet 13 in full contact against the soil 11 to be displaced so as to be more effective for mass displacement of the material by the explosive exhaust. The explosive action acting on the back 36 of plate 30 provides an improved leverage around the pivot pin 32 for increasing the force applied against the material 11 and also for forcing proportionally greater amounts of the explosiveexhaust out near the base or bottom of the plate 30 which also increases the leverage and increases the displacement action on the loosened material.
As explosive blasts are released from the outlet 13 of the combustion chamber 12, there is a tendency for the apparatus 10 to be thrust backwardly. Therefore, a position locking assembly may be provided if desired which may include a second piston 38 in communication with the combustion chamber through a passageway 40 and to which is connected a holding pin 42 which is positioned to extend downwardly and into engagement with the soil or material 11 as the piston 38 is actuated. Pin 42, as best seen in FIG. 2, will thus penetrate hard surfaces and give the ripping door 30 a finn support from which to push. Spring 44 is provided to act as a retracting means for the piston 38 after an explosion in which the force behind the piston is vented back to the combustion chamber 12.
Valve 50 normally is held in a seated position by the spring 52 and performs the function of sealing ofi the combustion chamber 12 from the outlet 13 until a predetermined buildup in the explosive force in the chamber occurs after which the valve 50 opens allowing the high pressure and the temperature gases to move out the outlet 13 and rupture the soil 11. However, the valve 50 also performs an additional function in that it provides a timing means to allow the actuation of the position locking assembly piston 38 at a time prior to the actuation of the plate piston 30 thereby insuring that the apparatus will be secured in place prior to the release of the explosive force through the outlet 13 so as to hold the apparatus 10 in place and insure that the full impact from outlet 13 will be exerted on the soil 11.
Of course, various modifications may be utilized to provide various types of digging assemblies such as ripping tools or penetration pins or chisels driven directly by the explosive pressures from the chamber 12 to loosen and break up the formation either without, prior to, and simultaneously with the material displacement from the chamber 12. F168. 3 and 4 illustrate modifications according to the present invention, letters a and b being applied to parts corresponding to those in FIGS. 1-2 inclusive, for convenience of reference. Thus, FIG. 3 illustrates in this embodiment a piston 56 which is exposed to the combustion chamber 12a drives a penetration rod or chisel 58 outwardly and forwardly of the front point 60 of the combustion chamber for breaking up the material formation adjacent the leading edge 60 to aid in the proper penetration and positioning of the outlet 13a of the combustion chamber to provide a more efficient penetration of the material 11a by the outlet 1130.
Referring now to FIG. 4 the material displacing apparatus 10b is preferably towed by means of supports 62. The outlet 13!; of the combustion chamber 12b is carried above the material 1117 which is to be ripped or broken and excavation of the soil 11b will be performed by any suitable means at a later step in the operation. In providing only a ripping operation, a piston 64 is provided hinged at its upper side to a pin 66 and mounted in the outlet 13b and thus in communication with the repetitive explosions from the combustion chamber 12b and carries a plurality of ripping teeth 68 which are connected to the piston door 64 and extend downwardly and forwardly below the outlet 13!) and into the soil or material 11b for ripping and breaking up the material. Preferably, the apparatus 10b is towed by suitable means (not shown) by the support 62 so that the prime mover is not required to travel over its own spoilage.
The present invention, therefore, is well adapted to carry out the objects and attain the ends and advantages mentioned as well as others inherent. therein. While pre ently preferred embodiments of the invention are given for the purpose of disclosure, numerous changes in the details of construction, and arrangement of parts will readily suggest themselves to those skilled in the art and which are encompassed within the spirit of the invention and the scope of the appended claims.
lclaim:
1. In combination with an apparatus for displacing material having a combustion chamber for creating and applying a repetitive explosive force against the material, a digging assembly comprising:
a piston in communication with the combustion chamber,
said piston including a door hinged at one side, digging means connected to one side of the piston remote from the combustion chamber and positioned to engage the material, said digging means including a plurality of ripping teeth for penetration and loosening of hard materials, and
means limiting the travel of the piston and the digging means.
2. In combination with an apparatus for displacing material having a combustion chamber for creating and applying a repetitive explosive force against the material, a digging assembly comprising:
a piston in communication with the combustion chamber,
digging meansconnected to one side of the piston remote from the combustion chamber and positioned to engage the material,
means limiting the travel of the piston and the digging means,
a second piston in communication with the combustion chamber, and
a pin connected to one side of the piston remote from the combustion chamber and positioned to be extended downwardly as the piston is actuated thereby acting to hold the apparatus in position when the digging assembly is actuated.
3. The apparatus of claim 2 including valve means sealing off the combustion chamber from the first piston until the second piston has been actuated.
4. In combination with an apparatus displacing material by applying combustion pressure from the repetitive ignition of a hydrocarbon fuel/air mixture from the outlet of a combustion chamber against the material, a digging assembly comprising:
a door pivotally connected at its upper side and positioned in the outlet of the combustion chamber to form a piston therein,
a plurality of ripper teeth connected to the door on the side remote from combustion chamber for engaging the material to be broken up,
a piston locking assembly including:
a second piston in communication with the combustion chamber, and
a pin connected to the piston on the side remote from the combustion chamber and positioned to be extended downwardly as the second piston is actuated thereby acting to hold the apparatus in position when the fuel/air mixture is ignited, and
valve means sealing off the combustion chamber from the door until the second piston has been actuated.
5. in combination with an apparatus for creating repetitive explosions from an outlet of a combustion chamber by the ignition of a hydrocarbon fuel/air mixture, a soil ripping assembly comprising:
the outlet of the combustion chamber being positioned about the soil,
a door pivotally connected at its upper side and positioned in the outlet of the combustion chamber to form a piston therein,
a plurality of ripper teeth connected to said door and extending downwardly and directed forwardly below said outlet and into the soil for loosening the soil, and
means for towing said apparatus across the soil.
Claims (5)
1. In combination with an apparatus for displacing material having a combustion chamber for creating and applying a repetitive explosive force against the material, a digging assembly comprising: a piston in communication with the combustion chamber, said piston including a door hinged at one side, digging means connected to one side of the piston remote from the combustion chamber and positioned to engage the material, said digging means including a plurality of ripping teeth for penetration and loosening of hard materials, and means limiting the travel of the piston and the digging means.
2. In combination with an apparatus for displacing material having a combustion chamber for creating and applying a repetitive explosive force against the material, a digging assembly comprising: a piston in communication with the combustion chamber, digging means connected to one side of the piston remote from the combustion chamber and positioned to engage the material, means limiting the travel of the piston and the digging means, a second piston in communication with the combustion chamber, and a pin connected to one side of the piston remote from the combustion chamber and positioned to be extended downwardly as the piston is actuated thereby acting to hold the apparatus in position when the digging assembly is actuated.
3. The apparatus of claim 2 including valve means sealing off the combustion chamber from the first piston until the second piston has been actuated.
4. In combination with an apparatus displacing material by applying combustion pressure from the repetitive ignition of a hydrocarbon fuel/air mixture from the outlet of a combustion chamber against the material, a digging assembly comprising: a door pivotally connected at its upper side and positioned in the outlet of the combustion chamber to form a piston therein, a plurality of ripper teeth connected to the door on the side remote from combustion chamber for engaging the material to be broken up, a piston locking assembly including: a second piston in communication with the combustion chamber, and a pin connected to the piston on the side remote from the combustion chamber and positioned to be extended downwardly as the second piston is actuated thereby acting to hold the apparatus in position when the fuel/air mixture is ignited, and valve means sealing off the combustion chamber from the door until the second piston has been actuated.
5. In combination with an apparatus for creating repetitive explosions from an outlet of a combustion chamber by the ignition of a hydrocarbon fuel/air mixture, a soil ripping assembly comprising: the outlet of the combustion chamber being positioned about the soil, a door pivotally connected at its upper side and positioned in the outlet of the combustion chamber to form a piston therein, a plurAlity of ripper teeth connected to said door and extending downwardly and directed forwardly below said outlet and into the soil for loosening the soil, and means for towing said apparatus across the soil.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US82362669A | 1969-05-12 | 1969-05-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3574404A true US3574404A (en) | 1971-04-13 |
Family
ID=25239271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US823626A Expired - Lifetime US3574404A (en) | 1969-05-12 | 1969-05-12 | Digging apparatus |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3574404A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3880568A (en) * | 1973-12-21 | 1975-04-29 | Southwest Res Inst | Combustion method and apparatus for generating repetitive explosions |
| US3887237A (en) * | 1973-06-07 | 1975-06-03 | Caterpillar Tractor Co | Ripper with repetitive explosive device for rock breaking |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1840002A (en) * | 1928-11-20 | 1932-01-05 | Wallis Charles William | Steam shovel |
| US2327619A (en) * | 1941-10-04 | 1943-08-24 | Francis N Bard | Rock drill |
| US2574103A (en) * | 1948-08-30 | 1951-11-06 | John P Hefner | Gasoline driven hammer |
| US3375596A (en) * | 1965-06-09 | 1968-04-02 | Guy O. Bacquie | Earthmoving apparatus |
| US3461577A (en) * | 1965-12-15 | 1969-08-19 | Southwest Res Inst | Method of and an apparatus for displacing materials |
-
1969
- 1969-05-12 US US823626A patent/US3574404A/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1840002A (en) * | 1928-11-20 | 1932-01-05 | Wallis Charles William | Steam shovel |
| US2327619A (en) * | 1941-10-04 | 1943-08-24 | Francis N Bard | Rock drill |
| US2574103A (en) * | 1948-08-30 | 1951-11-06 | John P Hefner | Gasoline driven hammer |
| US3375596A (en) * | 1965-06-09 | 1968-04-02 | Guy O. Bacquie | Earthmoving apparatus |
| US3461577A (en) * | 1965-12-15 | 1969-08-19 | Southwest Res Inst | Method of and an apparatus for displacing materials |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3887237A (en) * | 1973-06-07 | 1975-06-03 | Caterpillar Tractor Co | Ripper with repetitive explosive device for rock breaking |
| US3880568A (en) * | 1973-12-21 | 1975-04-29 | Southwest Res Inst | Combustion method and apparatus for generating repetitive explosions |
| US4113315A (en) * | 1973-12-21 | 1978-09-12 | Southwest Research Institute | Combustion apparatus for generating repetitive explosions |
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