US3903799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of blasting
Assignee: Individual
•
Filing: 1973-09-20
•
Granted: 1975-09-09
•
Expires: 1993-09-20
Abstract
Abstract A method of blasting which allows greater amounts of explosives to be detonated at one shooting than was possible by prior art methods while at the same time holding the maximum vibration produced at or below levels produced by a single detonation. A plurality of charges are arranged in spaced apart rows with the detonations within a row being detonated with time delays of 10 milliseconds or more and with the detonations between successive rows being detonated with time delays of from 25 to 150 milliseconds.
Inventors
- 👤 Richard E Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:30
CPC Classifications
F; F42; F42D; F42D1/00; F42D1/04; F42D1/06
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
169 words
A method of removing material from an open face of a quarry comprising the steps of: arranging a first column of blasting assemblies of progressively greater time delay periods in a column proceeding away from the quarry face, arranging a second column of blasting assemblies of progressively greater time delay periods in a column proceeding away from the quarry face, respective assemblies of said columns forming rows that are generally parallel to the quarry face and the assemblies of each row having generally the same time delay, causing a first electrical ignition circuit to be connected to said first column of blasting assemblies with the assemblies being in parallel circuit, causing a second electrical ignition circuit to be connected to said second column of blasting assemblies with the assemblies being in parallel circuit, and sequentially energizing said first and second ignition circuits at a time interval generally between approximately 10 and approximately 100 milliseconds to achieve a successive peeling type of crack propagation in the successive rows of material.
Claim 2
Independent Claim
169 words
A method of removing material from an open face of a quarry comprising the steps of: arranging a first column of blasting assemblies of progressively greater time delay periods in a column proceeding away from the quarry face, arranging a second column of blasting assemblies of progressively greater time delay periods in a column proceeding away from the quarry face, respective assemblies of said columns forming rows that are generally parallel to the quarry face and the assemblies of each row having generally the same time delay, causing a first electrical ignition circuit to be connected to said first column of blasting assemblies with the assemblies being in parallel circuit, causing a second electrical ignition circuit to be connected to said second column of blasting assemblies with the assemblies being in parallel circuit, and sequentially energizing said first and second ignition circuits at a time interval generally between approximately 10 and approximately 100 milliseconds to achieve a successive peeling type of crack propagation in the successive rows of material.
Claim 3
Dependent Claim
40 words
The method of claim 1 wherein said time interval between energization of said circuits and the number of rows is selected so that no two blasts occur simultaneously within approximately a half shock wave distance in the material being removed.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein said time interval and rows are selected so that two blasts occur simultaneously at approximately a half shock wave distance apart in the material being removed.
Claim 5
Dependent Claim
41 words
The method of claim 1 wherein the time delay between rows is between approximately 25 and 100 milliseconds to hold pressure on succeeding blasts, and the time delay between columns is between approximately 60 and 100 milliseconds for optimum peeling action.
Claim 6
Independent Claim
118 words
A method of removal of material from an open quarry face comprising: arranging a plurality of blasting charges in a succession of generally parallel rows generally parallel to the open quarry face and with the repsective members of each row being arranged in columns which proceed away from the quarry face, and sequentially detonating the respective charges in each column with a time delay between charges of from approximately 25 to 100 milliseconds to hold pressure at each succeeding charge to provide improved fissure production while also sequentially detonating the respective charges in each row with a time delay between approximately 10 and 100 milliseconds to provide improved crack propagation between fissure by means of a peeling action.
Claim 7
Independent Claim
118 words
A method of removal of material from an open quarry face comprising: arranging a plurality of blasting charges in a succession of generally parallel rows generally parallel to the open quarry face and with the repsective members of each row being arranged in columns which proceed away from the quarry face, and sequentially detonating the respective charges in each column with a time delay between charges of from approximately 25 to 100 milliseconds to hold pressure at each succeeding charge to provide improved fissure production while also sequentially detonating the respective charges in each row with a time delay between approximately 10 and 100 milliseconds to provide improved crack propagation between fissure by means of a peeling action.
Claim 8
Dependent Claim
37 words
The method of claim 5 wherein no two detonations occur at the same time unless they are spaced apart by a distance corresponding generally to at least the half shock wave distance in the material being removed.
Claim 9
Independent Claim
125 words
A method of blasting comprising: providing a plurality of rows of blast igniters with igniters in a particular row having generally the same time delay, but with the time delay of succeeding rows being of increasing time delay periods, providing a first electrical circuit connecting the first respective blast igniter of each row, providing a second electrical circuit connecting a different respective blast igniter of each row, and providing means energizing said second circuit after said first circuit with a time delay different from that used in said rows but which time delay is less than the largest time delay used in said rows, to produce a staggered arrangement of blasts which alternates between rows and in which no two blasts occur at the same.
Claim 10
Independent Claim
125 words
A method of blasting comprising: providing a plurality of rows of blast igniters with igniters in a particular row having generally the same time delay, but with the time delay of succeeding rows being of increasing time delay periods, providing a first electrical circuit connecting the first respective blast igniter of each row, providing a second electrical circuit connecting a different respective blast igniter of each row, and providing means energizing said second circuit after said first circuit with a time delay different from that used in said rows but which time delay is less than the largest time delay used in said rows, to produce a staggered arrangement of blasts which alternates between rows and in which no two blasts occur at the same.
Claim 11
Dependent Claim
70 words
The method of claim 7 including the steps of: providing additional igniters respective ones of which are located in each row and which are positioned between said igniters previously referred to, said additional igniters having time delay periods which differ from each other, and each of which differs from those previously referred to in its rows, and providing means energizing said additional igniters simultaneously with energization of said first circuit.
Claim 12
Dependent Claim
29 words
The method of claim 7 wherein the time delay between rows is at least 25 milliseconds, and said second circuit is energized approximately 60 milliseconds after said first circuit.
Claim 13
Dependent Claim
28 words
The method of claim 7 wherein the time delay between rows is approximately 100 milliseconds, and said second circuit is energized approximately 60 milliseconds after said first circuit.
Claim 14
Dependent Claim
44 words
The method of claim 8 wherein said second circuit is energized after said first circuit with a time delay which is greater than the minimum time delay period and less than the maximum time delay period of the igniters in the said first row.
Claim 15
Dependent Claim
18 words
The method of claim 8 wherein the time delay interval of said second series is approximately 60 milliseconds.
Claim 16
Independent Claim
171 words
A method of blasting comprising the steps of: arranging a multiplicity of blasting assemblies in rows that run in one direction and columns that run at generally right angles to the rows with the blast assemblies in the columns having increasing time delay periods, causing the time delay periods of the assemblies within a row to be greater in the second and fourth columns than in the first and third columns by a generally predetermined in-row time delay interval, causing the time delay periods of the assemblies of each column to increase by a generally predetermined between-row time delay interval, causing a first electrical ignition circuit to be connected to the first and second columns of said assemblies with the assemblies being in parallel, causing a second electrical ignition circuit to be connected to the third and fourth columns of said assemblies with the assemblies being in parallel, and energizing said second circuit after said first circuit with a time delay interval that is greater than the in-row time delay interval.
Claim 17
Independent Claim
171 words
A method of blasting comprising the steps of: arranging a multiplicity of blasting assemblies in rows that run in one direction and columns that run at generally right angles to the rows with the blast assemblies in the columns having increasing time delay periods, causing the time delay periods of the assemblies within a row to be greater in the second and fourth columns than in the first and third columns by a generally predetermined in-row time delay interval, causing the time delay periods of the assemblies of each column to increase by a generally predetermined between-row time delay interval, causing a first electrical ignition circuit to be connected to the first and second columns of said assemblies with the assemblies being in parallel, causing a second electrical ignition circuit to be connected to the third and fourth columns of said assemblies with the assemblies being in parallel, and energizing said second circuit after said first circuit with a time delay interval that is greater than the in-row time delay interval.
Claim 18
Dependent Claim
31 words
The method of claim 13 including the step of energizing said second circuit after said first circuit with a time delay interval that is less than said between-row time delay interval.
Claim 19
Dependent Claim
22 words
The method of claim 14 wherein said second circuit is energized after said first circuit by an interval of approximately 60 milliseconds.
Claim 20
Dependent Claim
25 words
The method of claim 15 wherein said in-row time delay interval is approximately 50 milliseconds and said between-row time delay interval is approximately 100 milliseconds.
Claim 21
Independent Claim
176 words
A method of blasting comprising the steps of: arranging a multiplicity of blasting assemblies in rows that run in one direction and columns that run at generally right angles to the rows with the blasting assemblies in the columns having increasing time delay periods, providing a plurality of individual electrical ignition circuits, connecting the blasting assemblies of predetermined columns to predetermined electrical ignition circuits with the blasting assemblies in parallel, and sequentially energizing said ignition circuits at times spaced apart by a uniform circuit delay interval determined by the formula x m y/n wherein: x said uniform circuit delay interval, y said between-row time delay interval, n the number of intervals between the ignition circuit energizations to give a predetermined composite time delay, and m the number of between-row time delay intervals to give said predetermined composite time delay, to provide an arrangement wherein the blasting assemblies are ignited sequentially in repeating spaced apart blocks with no more than one assembly in each block being ignited simultaneously with an assembly in another one of the blocks.
Claim 22
Independent Claim
176 words
A method of blasting comprising the steps of: arranging a multiplicity of blasting assemblies in rows that run in one direction and columns that run at generally right angles to the rows with the blasting assemblies in the columns having increasing time delay periods, providing a plurality of individual electrical ignition circuits, connecting the blasting assemblies of predetermined columns to predetermined electrical ignition circuits with the blasting assemblies in parallel, and sequentially energizing said ignition circuits at times spaced apart by a uniform circuit delay interval determined by the formula x m y/n wherein: x said uniform circuit delay interval, y said between-row time delay interval, n the number of intervals between the ignition circuit energizations to give a predetermined composite time delay, and m the number of between-row time delay intervals to give said predetermined composite time delay, to provide an arrangement wherein the blasting assemblies are ignited sequentially in repeating spaced apart blocks with no more than one assembly in each block being ignited simultaneously with an assembly in another one of the blocks.
Claim 23
Dependent Claim
64 words
The method of claim 17 including the steps of: causing the time delay periods of the assemblies within a row to be greater in the even number columns than in the odd number columns by a generally predetermined in-row time delay interval, and causing respective electrical ignition circuits to be connected to the assemblies of both an odd and an adjacent even number column.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |