Patent US3648282A successfully refreshed from Google Patents.
US3648282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm signal apparatus to indicate damage to the insulation of an electrical cable as it is being laid underground
Assignee: Individual
•
Filing: 1970-02-17
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Granted: 1972-03-07
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Expires: 1990-02-17
Abstract
Abstract During underground cable laying operations of electrical cables such as power, telephone, and TV cables, a cable damage alarm signal apparatus is secured to cable laying machinery equipped with a combined plow tooth and cable chute. This cable damage alarm signal apparatus has a detection circuit connected between the metal sheath of the cable, or alternatively its inner conductor, and the frame of the cable laying machinery. Upon damage of the insulation of the cable, current flows in the detection circuit and the alarm circuit is energized.
Inventors
- 👤 John B Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:39
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/02; E02F5/10; E02F5/102; H; H02; H02G; H02G1/00; H02G1/06
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
198 words
A cable damage alarm adaptable for use in conjunction with underground cable laying machines to instantaneously indicate to operators of cable laying machinery that the insulation of a cable being placed underground has been damaged and it is in need of immediate repair, comprising: a. a detection circuit to be completed upon an occurrence of cable insulation damage, comprising in turn, a source of electrical energy, a relay coil, connected to the source of electrical energy, a ground circuit lead connected to the source of electrical energy and adapted for connection to cable laying machinery, and a lead connected to the relay coil and adapted for a rotatable electrical connection to a cable end secured to a cable reel and insulated from the cable laying machinery; and b. an alarm circuit to be completed upon the operation of the relay coil of the detection circuit, comprising in turn, a source of electrical energy, a switch connected to the source of electrical energy and to be closed upon operation of the detection circuit relay coil, alarm rendering means (, and leads to join these members of this alarm circuit) connected between the source of electrical energy and the switch.
Claim 2
Dependent Claim
198 words
A cable damage alarm adaptable for use in conjunction with underground cable laying machines to instantaneously indicate to operators of cable laying machinery that the insulation of a cable being placed underground has been damaged and it is in need of immediate repair, comprising: a. a detection circuit to be completed upon an occurrence of cable insulation damage, comprising in turn, a source of electrical energy, a relay coil, connected to the source of electrical energy, a ground circuit lead connected to the source of electrical energy and adapted for connection to cable laying machinery, and a lead connected to the relay coil and adapted for a rotatable electrical connection to a cable end secured to a cable reel and insulated from the cable laying machinery; and b. an alarm circuit to be completed upon the operation of the relay coil of the detection circuit, comprising in turn, a source of electrical energy, a switch connected to the source of electrical energy and to be closed upon operation of the detection circuit relay coil, alarm rendering means (, and leads to join these members of this alarm circuit) connected between the source of electrical energy and the switch.
Claim 3
Dependent Claim
19 words
A cable damage alarm, as claimed in claim 1, wherein the alarm rendering means, comprises an audible warning signal.
Claim 4
Dependent Claim
70 words
an alarm circuit to be completed upon the operation oF the relay coil of the detection circuit, comprising in turn, a source of electrical energy, a switch connected to the source of electrical energy and to be closed upon operation of the detection circuit relay coil, alarm rendering means (, and leads to join these members of this alarm circuit) connected between the source of electrical energy and the switch.
Claim 5
Dependent Claim
70 words
an alarm circuit to be completed upon the operation oF the relay coil of the detection circuit, comprising in turn, a source of electrical energy, a switch connected to the source of electrical energy and to be closed upon operation of the detection circuit relay coil, alarm rendering means (, and leads to join these members of this alarm circuit) connected between the source of electrical energy and the switch.
Claim 6
Dependent Claim
19 words
A cable damage alarm, as claimed in claim 1, wherein the alarm rendering means, comprises a visual warning signal.
Claim 7
Dependent Claim
21 words
A cable damage alarm, as claimed in claim 1, wherein the alarm rendering means, comprises both visual and audible warning signals.
Claim 8
Dependent Claim
37 words
A cable damage alarm, as claimed in claim 1, wherein the alarm rendering means is capable of keying an external transmitter which transmits an alarm signal to be picked up by a receiver carried by a superintendent.
Claim 9
Dependent Claim
34 words
A cable damage alarm, as claimed in claim 1, wherein the detection circuit comprises a collector spring means used in making the rotatable electrical connection to a cable end secured to a cable reel.
Claim 10
Dependent Claim
19 words
A cable damage alarm, as claimed in claim 1, wherein the detection circuit has an on and off switch.
Claim 11
Dependent Claim
22 words
A cable damage alarm, as claimed in claim 1, wherein the detection circuit has a testing circuit branch including a test switch.
Claim 12
Dependent Claim
49 words
A cable damage alarm, as claimed in claim 8, wherein the testing circuit branch has a resistor for assurance of the sensitivity of the testing circuit to match the anticipated overall detection circuit operation upon the occurrence of actual damage to the insulation on a cable being laid underground.
Claim 13
Dependent Claim
71 words
In a combination with a cable laying machine, a cable damage alarm to immediately indicate to observers of cable laying machinery that the insulation of a cable being placed underground has been damaged and it is in need of repair, comprising: a. cable laying machine having cable reel dispensing accessories, a chassis and a ground plow and cable chute secured to the chassis; b. a cable damage alarm comprising, in turn,
Claim 14
Dependent Claim
71 words
In a combination with a cable laying machine, a cable damage alarm to immediately indicate to observers of cable laying machinery that the insulation of a cable being placed underground has been damaged and it is in need of repair, comprising: a. cable laying machine having cable reel dispensing accessories, a chassis and a ground plow and cable chute secured to the chassis; b. a cable damage alarm comprising, in turn,
Claim 15
Dependent Claim
25 words
A cable damage alarm, as claimed in claim 1, wherein connection means are provided to connect the tractor horn and light to the alarm circuit.
Claim 16
Dependent Claim
23 words
A cable damage alarm, as claimed in claim 1, wherein connection means is provided to connect the tractor horn to the alarm circuit.
Claim 17
Dependent Claim
23 words
A cable damage alarm, as claimed in claim 1, wherein connection means is provided to connect the tractor light to the alarm circuit.
Claim 18
Dependent Claim
27 words
A cable damage alarm, as claimed in claim 1, wherein a connection means is provided to connect the tractor DC power electrical source to the alarm circuit.
Claim 19
Dependent Claim
30 words
A cable damage alarm, as claimed in claim 1, wherein the detection circuit has a variable resistor to adjust the sensitivity of the detection circuit to meet variable field conditions.
References Cited (Backward Citations)
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US1938684A
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US1950484A
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US2131291A
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US2561152A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |