US3727982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of electrically destroying concrete and/or mortar and device therefor
Assignee: Fujimotors Inc
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Filing: 1971-03-08
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Granted: 1973-04-17
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Expires: 1991-03-08
Abstract
Abstract This invention relates to a method of electrically destroying a ferroconcrete body which comprises steps of conducting an alternating magnetic flux generated at an exciting coil to a ferromagnetic material present in the inner part of a ferroconcrete body or conducting an alternating magnetic flux generated at an exciting coil connecting capacitors in parallel to a part or entire part of a coil to said ferromagnetic material thereby to constitute a controlled magnetic induction circuit mainly including said ferromagnetic material and magnetic inductor, and raising the temperature of said ferromagnetic material, and a device therefor.
Inventors
- 👤 Y Itoh
- 👤 M Kawamura
- 👤 Y Kasai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:36
CPC Classifications
E; E04; E04G; E04G23/00; E04G23/08; H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/101
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
100 words
A device for electrically destroying a ferroconcrete body characterized in that a magnetic inductor iron core (11) having a shape of consisting of two leg parts and connecting parts thereof is set closely to a round reinforcing steel bar (14) buried in a ferroconcrete body (13) and exciting coils (12,12) are wound around the leg parts of said iron core (11) thereby to pass a magnetic flux generated at said exciting coil (12) through said round reinforcing steel bar (14), and further said exciting coil (12) is connected to AC power source (26) in parallel together with a capacitor (25).
Claim 2
Independent Claim
100 words
A device for electrically destroying a ferroconcrete body characterized in that a magnetic inductor iron core (11) having a shape of consisting of two leg parts and connecting parts thereof is set closely to a round reinforcing steel bar (14) buried in a ferroconcrete body (13) and exciting coils (12,12) are wound around the leg parts of said iron core (11) thereby to pass a magnetic flux generated at said exciting coil (12) through said round reinforcing steel bar (14), and further said exciting coil (12) is connected to AC power source (26) in parallel together with a capacitor (25).
Claim 3
Independent Claim
89 words
A device for electrically destroying a ferroconcrete body characterized in that a magnetic inductor Iron core (11) having very short leg parts or no leg part and exciting coil (12) wound around central part is set closely to a round reinforcing steel bar (14) buried in a ferroconcrete body (13) thereby to pass a magnetic flux generated at said exciting coil (12) through said round reinforcing steel bar (14), and further said exciting coil (12) is connected to AC power source (26) in parallel together with a capacitor (25).
Claim 4
Independent Claim
89 words
A device for electrically destroying a ferroconcrete body characterized in that a magnetic inductor Iron core (11) having very short leg parts or no leg part and exciting coil (12) wound around central part is set closely to a round reinforcing steel bar (14) buried in a ferroconcrete body (13) thereby to pass a magnetic flux generated at said exciting coil (12) through said round reinforcing steel bar (14), and further said exciting coil (12) is connected to AC power source (26) in parallel together with a capacitor (25).
Claim 5
Independent Claim
102 words
A device for electrically destroying a ferroconcrete body characterized in that a magnetic inductor iron core (11) having a shape of consisting of three leg parts and connecting parts thereof is set closely to a round reinforcing steel bar (14) buried in a ferroconcrete body (13) and an exciting coil (12) is wound around the central leg part of said iron core (11) thereby to pass a magnetic flux generated at said exciting coil (12) through said round reinforcing steel bar (14), and further said exciting coil (12) is connected to AC power source (26) in parallel together with a capacitor (25).
Claim 6
Independent Claim
102 words
A device for electrically destroying a ferroconcrete body characterized in that a magnetic inductor iron core (11) having a shape of consisting of three leg parts and connecting parts thereof is set closely to a round reinforcing steel bar (14) buried in a ferroconcrete body (13) and an exciting coil (12) is wound around the central leg part of said iron core (11) thereby to pass a magnetic flux generated at said exciting coil (12) through said round reinforcing steel bar (14), and further said exciting coil (12) is connected to AC power source (26) in parallel together with a capacitor (25).
Claim 7
Independent Claim
102 words
The method of destroying a ferroconcrete body formed of a concrete mass having ferromagnetic reinforcements embedded therein, said method comprising positioning an exciting coil very close to the surface of the ferroconcrete body nearest the embedded ferromagnetic reinforcements, applying an alternating electric current to the exciting coil to produce an alternating magnetic flux; and controlling the field of said magnetic flux by the use of a magnetic core for said exciting coil so that the magnetic flux passes mainly through the ferromagnetic reinforcements and raises the temperature of said ferromagnetic reinforcements to facilitate separation of the embedded reinforcement from its boundary concrete.
Claim 8
Independent Claim
102 words
The method of destroying a ferroconcrete body formed of a concrete mass having ferromagnetic reinforcements embedded therein, said method comprising positioning an exciting coil very close to the surface of the ferroconcrete body nearest the embedded ferromagnetic reinforcements, applying an alternating electric current to the exciting coil to produce an alternating magnetic flux; and controlling the field of said magnetic flux by the use of a magnetic core for said exciting coil so that the magnetic flux passes mainly through the ferromagnetic reinforcements and raises the temperature of said ferromagnetic reinforcements to facilitate separation of the embedded reinforcement from its boundary concrete.
Claim 9
Independent Claim
120 words
The method of destroying a ferroconcrete body formed of a concrete mass having ferromagnetic reinforcements embedded therein, said method comprising positioning an exciting coil very close to the surface of the ferroconcrete body nearest the embedded ferromagnetic reinforcements, applying an alternating electric current to the exciting coil to produce an alternating magnetic flux; connecting a capacitor in parallel with said exciting coil so as to reduce the needed alternating current magnitude; and controlling the field of said magnetic flux by the use of a magnetic core for said exciting coil so that the magnetic flux passes mainly through the ferromagnetic reinforcements and raises the temperature of said ferromagnetic reinforcements to facilitate separation of the embedded reinforcement from its boundary concrete.
Claim 10
Independent Claim
120 words
The method of destroying a ferroconcrete body formed of a concrete mass having ferromagnetic reinforcements embedded therein, said method comprising positioning an exciting coil very close to the surface of the ferroconcrete body nearest the embedded ferromagnetic reinforcements, applying an alternating electric current to the exciting coil to produce an alternating magnetic flux; connecting a capacitor in parallel with said exciting coil so as to reduce the needed alternating current magnitude; and controlling the field of said magnetic flux by the use of a magnetic core for said exciting coil so that the magnetic flux passes mainly through the ferromagnetic reinforcements and raises the temperature of said ferromagnetic reinforcements to facilitate separation of the embedded reinforcement from its boundary concrete.
Claim 11
Independent Claim
118 words
The method of destroying a ferroconcrete body formed of a concrete mass having ferromagnetic reinforcements embedded therein, said method comprising positioning an exciting coil very close to the surface of the ferroconcrete body nearest the embedded ferromagnetic reinforcements; applying an alternating electric current to the exciting coil to produce an alternating magnetic flux; and controlling the field of said magnetic flux by the use of a magnetic core for said exciting coil so that the magnetic flux passes mainly through the ferromagnetic reinforcements; said controlling is achieved by selecting a magnetic core having at least two poles separated by a distance of about two times the distance between the surface adjacent said coil and the embedded ferromagnetic reinforcements.
Claim 12
Independent Claim
118 words
The method of destroying a ferroconcrete body formed of a concrete mass having ferromagnetic reinforcements embedded therein, said method comprising positioning an exciting coil very close to the surface of the ferroconcrete body nearest the embedded ferromagnetic reinforcements; applying an alternating electric current to the exciting coil to produce an alternating magnetic flux; and controlling the field of said magnetic flux by the use of a magnetic core for said exciting coil so that the magnetic flux passes mainly through the ferromagnetic reinforcements; said controlling is achieved by selecting a magnetic core having at least two poles separated by a distance of about two times the distance between the surface adjacent said coil and the embedded ferromagnetic reinforcements.
Claim 13
Dependent Claim
36 words
A method as in claim 6, wherein the width of the coil around the core is selected to be at least two times the distance between the surface adjacent said coil and the embedded ferromagnetic reinforcements.
Claim 14
Independent Claim
136 words
The method of destroying a ferroconcrete body formed of a concrete mass having ferromagnetic reinforcements embedded therein, said method comprising positioning an exciting coil very close to the surface of the ferroconcrete body nearest the embedded ferromagnetic reinforcements, applying an alternating electric current to the exciting coil to produce an alternating magnetic flux; connecting a capacitor in parallel wIth said exciting coil so as to reduce the required alternating current magnitude and controlling the field of said magnetic flux by the use of a magnetic core for said exciting coil so that the magnetic flux passes mainly through the ferromagnetic reinforcements; said controlling is achieved by selecting a magnetic core having at least two poles separated by a distance of about two times the distance between the surface adjacent said coil and the embedded ferromagnetic reinforcements.
Claim 15
Independent Claim
136 words
The method of destroying a ferroconcrete body formed of a concrete mass having ferromagnetic reinforcements embedded therein, said method comprising positioning an exciting coil very close to the surface of the ferroconcrete body nearest the embedded ferromagnetic reinforcements, applying an alternating electric current to the exciting coil to produce an alternating magnetic flux; connecting a capacitor in parallel wIth said exciting coil so as to reduce the required alternating current magnitude and controlling the field of said magnetic flux by the use of a magnetic core for said exciting coil so that the magnetic flux passes mainly through the ferromagnetic reinforcements; said controlling is achieved by selecting a magnetic core having at least two poles separated by a distance of about two times the distance between the surface adjacent said coil and the embedded ferromagnetic reinforcements.
Claim 16
Dependent Claim
36 words
A method as in claim 8, wherein the width of the coil around the core is selected to be at least two times the distance between the surface adjacent said coil and the embedded ferromagnetic reinforcements.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |