Patent US3871302A successfully refreshed from Google Patents.
US3871302A
Expired / Lapsed
US
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Trolley control system
Assignee: Consolidation Coal Co
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Filing: 1973-09-26
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Granted: 1975-03-18
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Expires: 1993-09-26
Abstract
Abstract A transmitting device mounted on a trolley vehicle for operation within an underground mine transmits a first coded signal through an overhanging transmission line that extends through the mine haulageway to a receiver and is arranged in parallel relation to the trolley wire. The receiver delivers an output signal to a circuit breaking device in response to the input signal received from the transmitting device. The output signal from the receiver adjusts the overload setting of the circuit breaking device to allow current flow from a rectified source to the trolley wire at a predetermined level as required for operation of the trolley vehicle above the minimum current level provided continuously on the trolley wire. The incremental increase of current through the trolley wire associated with a fault will exceed the overload setting of the circuit breaking device thereby opening the circuit breaking device to interrupt the flow of current passing through the trolley wire. an emergency ''''off'''' signal transmitted as a second coded signal to the receiver locks out all other signals being transmitted from other trolley vehicles to the receiver and thereby actuates the circuit breaking device to interrupt the flow of current to the trolley wire.
Inventors
- 👤 Will B Jamison
- 👤 John F Burr
- 👤 Homayoun Hadi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:42
CPC Classifications
B; B60; B60L; B60L3/00; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
144 words
Apparatus for controlling the supply of electric current to a trolley wire comprising, a transmitting means for transmitting a first coded signal, receiving means for receiving the first coded signal, said receiving means positioned remote of said transmitting means, circuit breaking means for controlling the flow of electric current to said trolley wire, said circuit breaking means actuated by said receiving means upon receipt of the first coded signal to provide flow of electric current to said trolley wire and thereby energize said trolley wire at a preselected current magnitude, said transmitting means operable to transmit a second coded signal to said receiving means, and said circuit breaking means actuated by said receiving means upon receipt of the second coded signal to override said first coded signal which is transmitted from another transmitting means in order to interrupt current flow to said trolley wire.
Claim 2
Dependent Claim
144 words
Apparatus for controlling the supply of electric current to a trolley wire comprising, a transmitting means for transmitting a first coded signal, receiving means for receiving the first coded signal, said receiving means positioned remote of said transmitting means, circuit breaking means for controlling the flow of electric current to said trolley wire, said circuit breaking means actuated by said receiving means upon receipt of the first coded signal to provide flow of electric current to said trolley wire and thereby energize said trolley wire at a preselected current magnitude, said transmitting means operable to transmit a second coded signal to said receiving means, and said circuit breaking means actuated by said receiving means upon receipt of the second coded signal to override said first coded signal which is transmitted from another transmitting means in order to interrupt current flow to said trolley wire.
Claim 3
Dependent Claim
56 words
Apparatus for controlling the supply of electric current to a trolley wire as set forth in claim 1 in which said transmitting means includes, a transmitting device mounted to a trolley vehicle, an antenna arranged in cooperation with said transmitting device on the trolley vehicle, said transmitting device operable to emit coded signals from said antenna.
Claim 4
Dependent Claim
53 words
Apparatus for controlling the supply of electric current to a trolley wire as set forth in claim 2 in which, said transmitting device is operable to emit from said antenna coded signals at a given frequency selected from a plurality of frequencies within the range of 30 kilo hertz to 1 mega hertz.
Claim 5
Dependent Claim
56 words
Apparatus for controlling the supply of electric current to a trolley wire as set forth in claim 2 which includes, a pick-up wire suitably positioned adjacent to said antenna and connected to said receiving means, said pick-up arranged to receive electromagnetic signals transmitted from said transmitting device and conduct said electromagnetic signals to said receiving means.
Claim 6
Dependent Claim
56 words
Apparatus for controlling the supply of electric current to a trolley wire as set forth in claim 4 in which, said pick-up wire includes an insulated transmission line arranged in parallel relation to said trolley wire, said transmission line operable to provide the passage of electromagnetic signals transmitted by said transmitting means to said receiving mEans.
Claim 7
Dependent Claim
65 words
Apparatus for controlling the supply of electric current to a trolley wire as set forth in claim 5 which includes, said transmission line and said trolley wire divided into a plurality of corresponding blocks each having said receiver means and said circuit breaking means provided therein, each of said trolley wire blocks supplied with a continuous flow of electric current maintained at a minimum level.
Claim 8
Dependent Claim
73 words
Apparatus for controlling the supply of electric current to a trolley wire as set forth in claim 6 which includes, each of said trolley wire blocks being selectively energized at a predetermined current level above said minimum level by the transmission of coded signals through each of said corresponding transmission line blocks to said receiving means for actuation of said circuit breaking means to permit current flow to said preselected trolley wire block.
Claim 9
Dependent Claim
77 words
Apparatus for controlling the supply of electric current to a trolley wire as set forth in claim 1 in which said circuit breaking means includes, a circuit breaking device maintained in a normally closed position to thereby provide continuous flow of electric current at a predetermined level to said trolley wire, said circuit breaking device operable to open and interrupt the flow of electric current to said trolley wire when a fault in said trolley wire occurs.
Claim 10
Dependent Claim
43 words
Apparatus for controlling the supply of electric current to a trolley wire as set forth in claim 8 in which, said circuit breaking device includes an overload setting adjustable to permit flow of electric current at an increased level to said trolley wire.
Claim 11
Dependent Claim
63 words
Apparatus for controlling the supply of electric current to a trolley wire as set forth in claim 9 in which, said transmitting means is operable to transmit coded signals to said receiving means to thereby actuate said circuit breaking device so that the overload setting thereof is adjusted to permit the flow of electric current to said trolley wire at a predetermined level.
Claim 12
Dependent Claim
91 words
Apparatus for controlling the supply of electric current to a trolley wire as set forth in claim 1 in which said receiving means includes, a main receiver which receives the signal from said transmitting means and supplies a first signal to actuate said circuit breaking means and a second signal, and an auxiliary receiver electrically coupled to said main receiver to receive the second signal from said main receiver and supply an auxiliary output signal responsive to the signal of said transmitting means to actuate another of said circuit breaking means.
Claim 13
Dependent Claim
179 words
Apparatus for controlling the supply of electric current to a trolley wire comprising, a transmitting means for transmitting a first coded signal, receiving means for receiving the first coded signal, said receiving means positioned remote to said transmitting means, circuit breaking means for controlling the flow of electric current to said trolley wire, said circuit breaking means operable to allow a minimum current level to flow continually into said trolley wire and to interrupt the flow of said minimum current level when a fault in said trolley wire occurs, said circuit breaking means actuated by said receiving means upon receipt of the first coded signal to provide flow of electric current to said trolley wire and thereby energize said trolley wire at a preselected current magnitude over the minimum current level already flowing through said trolley wire, and said circuit breaking means returning said trolley wire to said minimum current level in the absence of the first coded signal being transmitted to said receiving means in order to allow said minimum current level to flow through said trolley wire.
Claim 14
Dependent Claim
179 words
Apparatus for controlling the supply of electric current to a trolley wire comprising, a transmitting means for transmitting a first coded signal, receiving means for receiving the first coded signal, said receiving means positioned remote to said transmitting means, circuit breaking means for controlling the flow of electric current to said trolley wire, said circuit breaking means operable to allow a minimum current level to flow continually into said trolley wire and to interrupt the flow of said minimum current level when a fault in said trolley wire occurs, said circuit breaking means actuated by said receiving means upon receipt of the first coded signal to provide flow of electric current to said trolley wire and thereby energize said trolley wire at a preselected current magnitude over the minimum current level already flowing through said trolley wire, and said circuit breaking means returning said trolley wire to said minimum current level in the absence of the first coded signal being transmitted to said receiving means in order to allow said minimum current level to flow through said trolley wire.
Claim 15
Dependent Claim
72 words
Apparatus for controlling the supply of electric current to a trolley wire as set forth in claim 12 which includes, said transmitting means operable to transmit a second coded signal to said receiving means, and said cirCuit breaking means actuated by said receiving means upon receipt of the second coded signal to completely interrupt current flow to said trolley wire even though said first coded signal is transmitted from another transmitting means.
References Cited (Backward Citations)
US1817692A
Cited
US2478133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |