US2658191A - Electric signal for trackless trolley coaches - Google Patents

Electric signal for trackless trolley coaches Download PDF

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Publication number
US2658191A
US2658191A US235155A US23515551A US2658191A US 2658191 A US2658191 A US 2658191A US 235155 A US235155 A US 235155A US 23515551 A US23515551 A US 23515551A US 2658191 A US2658191 A US 2658191A
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coach
frame
electric signal
coaches
trackless trolley
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Expired - Lifetime
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US235155A
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Samuel S Stolp
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Cheatham Electric Switching Device Co
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Cheatham Electric Switching Device Co
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Priority to US235155A priority Critical patent/US2658191A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18—Measuring resistance to earth, i.e. line to ground

Definitions

  • This invention relates to an alarm device especially designed for use on coaches operating on a trackless trolley system.
  • the object of the invention is to devise an arrangement for producing a warning signal in case of a break-down of the insulation between the power circuits and the frame or body of a coach operating on a trackless trolley system. Such a break-down might be dangerous to persons boarding or leaving the coach, or to anyone standing on the ground and touching the coach body.
  • My charge detector circuit is especially designed for use on coaches provided with rubber tires and operating from a trackless trolley system at a voltage of the order of 600 volts.
  • My charge detector circuit is designed to operate a warning signal if the charge on the coach frame exceeds a value of approximately 50 volts.
  • a further object is to provide a uni-lateral conducting device, such as a one-way rectifier, in series with the detector circuit to prevent the application of the trolley voltage to the coach frame, through the detector circuit, when the coach is operated temporarily on the wrong side of the street, at which time the collectors are reversed.
  • a uni-lateral conducting device such as a one-way rectifier
  • My invention is illustrated diagrammatically in the accompanying drawing in which the two trolley wires are shown at l and 2, for supplying current at 600 volts to a coach 3 through the usual collectors 3b and 30 mounted on top of the coach.
  • the coach is provided with rubber tires and the frame of the coach will be insulated from the ground.
  • the negative trolley wire 2 usually is grounded, and in the case of improper insulation between the frame of the coach 3 and any connection leading to the positive trolley wire I the frame will become charged positively with respect to ground. If this positive charge exceeds 50 volts, it may become dangerous to persons using the coach, especially when they are boarding or leaving the coach.
  • One suitable form of my detector circuit includes a voltage sensitive relay 5 having an operating winding 5a and a switch blade 5b.
  • Relay 5 should operate at low current value, such as one milliampere.
  • the winding 5:; is connected in series with a rectifier 6 in a circuit extending from the frame of the coach to the collector 30 which normally engages negative trolley wire 2.
  • the rectifier 6 shown in the drawing is a doublediode electron tube rectifier having two cathodes 6a and two anodes 61:, but a single-diode may be used if desired.
  • the circuit for relay winding 5 extends from the frame of the coach to the two anode elements of the rectifier 6 through a series resistor l of high resistance value, for example, 30,000 ohms.
  • the cathode of the rectifier is connected to one terminal of the winding 5a and the other terminal of the winding is connected through connection 8 to collector which normally engages the negative trolley wire 2.
  • the cathode heater 6c of the rectifier 6 is energized by current from the trolley wires through connections, including a series resistor of approximately 8,000 ohms to reduce the voltage applied across the terminals of the heater.
  • the heater circuit also includes a signal lamp l3, preferably of amber color, to indicate that the circuit is in operating condition. This lamp may be shunted by a resistor I2 of approximately 200 ohms to maintain the detector circuit in operation in case the lamp l3 burns out.
  • Relay 5 is a sensitive relay requiring small current for its operation, and it should operate when the frame of the coach 3 becomes charged to a value of approximately volts with respect to round.
  • the blade 52 When the relay operates, the blade 52) completes a circuit through a suitable signal device such as one or more signal lamps l4, and an energizing battery I5, to warn the operator that the frame of the coach is charged to a value approaching the danger point.
  • a suitable signal device such as one or more signal lamps l4, and an energizing battery I5, to warn the operator that the frame of the coach is charged to a value approaching the danger point.
  • the signal lamps l4 produce red light to emphasize the dangerous condition.
  • collectors will be reversed so that collector 30 engages the high voltage trolley wire I, while collector 3b engages the grounded wire 2.
  • rectifier 6 will prevent the high voltage of trolley wire I from being applied to the frame of the coach through the detector circuit.
  • ionizable gas such as neon
  • a charge detector circuit for a two collector coach on a trackless trolley system in which one trolley wire is grounded comprising a unilateral conductive device comprising an electron tube having an anode, a cathode, and a heater for the cathode, a high-resistance connection for energizing said heater from the two collectors of said coach, a connection from said anode to the frame of said coach, a resistance element inserted in the connection between the anode and the frame of the coach and having a resistance value of the order of 30,000 ohms, a connection from said cathode to the collector which normally engages the grounded trolley wire, a voltage-sensitive electromagnetic relay having an operating winding included in the last mentioned connec 4 tion, and a signal device controlled by said relay.
  • a charge detector circuit including a signal lamp connected in series with the energizing circuit of said cathode heater.

Description

Nov. 3, 1953 s. s. STOLP 2,658,191
ELECTRIC SIGNAL FOR TRACKLEZSS TROLLEY COACHES Filed July 5, 1951 INVENTOR. 5ANUZ 5. 5 a 1,
A Z'I'OLNE) Patented Nov. 3, 1953 ELECTRIC SIGNAL FOR TRACKLESS TROLLEY COACHES Samuel S. Stolp, Louisville, Ky., assignor to Cheatham Electric Switching Device 00., Incorporated, Louisville, Ky., a corporation of Kentucky Application July 5, 1951, Serial No. 235,155
2 Claims. (Cl. 340--248) This invention relates to an alarm device especially designed for use on coaches operating on a trackless trolley system.
The object of the invention is to devise an arrangement for producing a warning signal in case of a break-down of the insulation between the power circuits and the frame or body of a coach operating on a trackless trolley system. Such a break-down might be dangerous to persons boarding or leaving the coach, or to anyone standing on the ground and touching the coach body.
My charge detector circuit is especially designed for use on coaches provided with rubber tires and operating from a trackless trolley system at a voltage of the order of 600 volts. My charge detector circuit is designed to operate a warning signal if the charge on the coach frame exceeds a value of approximately 50 volts.
A further object is to provide a uni-lateral conducting device, such as a one-way rectifier, in series with the detector circuit to prevent the application of the trolley voltage to the coach frame, through the detector circuit, when the coach is operated temporarily on the wrong side of the street, at which time the collectors are reversed.
My invention is illustrated diagrammatically in the accompanying drawing in which the two trolley wires are shown at l and 2, for supplying current at 600 volts to a coach 3 through the usual collectors 3b and 30 mounted on top of the coach. It will be understood that the coach is provided with rubber tires and the frame of the coach will be insulated from the ground. The negative trolley wire 2 usually is grounded, and in the case of improper insulation between the frame of the coach 3 and any connection leading to the positive trolley wire I the frame will become charged positively with respect to ground. If this positive charge exceeds 50 volts, it may become dangerous to persons using the coach, especially when they are boarding or leaving the coach.
One suitable form of my detector circuit includes a voltage sensitive relay 5 having an operating winding 5a and a switch blade 5b. Relay 5 should operate at low current value, such as one milliampere. The winding 5:; is connected in series with a rectifier 6 in a circuit extending from the frame of the coach to the collector 30 which normally engages negative trolley wire 2. The rectifier 6 shown in the drawing is a doublediode electron tube rectifier having two cathodes 6a and two anodes 61:, but a single-diode may be used if desired. The circuit for relay winding 5 extends from the frame of the coach to the two anode elements of the rectifier 6 through a series resistor l of high resistance value, for example, 30,000 ohms. The cathode of the rectifier is connected to one terminal of the winding 5a and the other terminal of the winding is connected through connection 8 to collector which normally engages the negative trolley wire 2.
The cathode heater 6c of the rectifier 6 is energized by current from the trolley wires through connections, including a series resistor of approximately 8,000 ohms to reduce the voltage applied across the terminals of the heater. The heater circuit also includes a signal lamp l3, preferably of amber color, to indicate that the circuit is in operating condition. This lamp may be shunted by a resistor I2 of approximately 200 ohms to maintain the detector circuit in operation in case the lamp l3 burns out.
Relay 5 is a sensitive relay requiring small current for its operation, and it should operate when the frame of the coach 3 becomes charged to a value of approximately volts with respect to round.
When the relay operates, the blade 52) completes a circuit through a suitable signal device such as one or more signal lamps l4, and an energizing battery I5, to warn the operator that the frame of the coach is charged to a value approaching the danger point. Preferably the signal lamps l4 produce red light to emphasize the dangerous condition.
Sometimes it is necessary to operate the coach temporarily on the wrong side of the street, and in this case the collectors will be reversed so that collector 30 engages the high voltage trolley wire I, while collector 3b engages the grounded wire 2. Under this condition of operation, rectifier 6 will prevent the high voltage of trolley wire I from being applied to the frame of the coach through the detector circuit.
While I have illustrated a preferred form of my detector circuit involving the use of a voltagesensitive relay for controlling the operation of a signal device, it is obviou that other forms of alarm devices may be employed, such as a twoelectrode lamp filled with ionizable gas such as neon. This lamp would be connected in the detector circuit in the place of the relay 5, and the lamp will produce a visible glow when the charge on the coach frame exceeds the ionization voltage of the gas filling.
What I claim is:
1. A charge detector circuit for a two collector coach on a trackless trolley system in which one trolley wire is grounded, said circuit comprising a unilateral conductive device comprising an electron tube having an anode, a cathode, and a heater for the cathode, a high-resistance connection for energizing said heater from the two collectors of said coach, a connection from said anode to the frame of said coach, a resistance element inserted in the connection between the anode and the frame of the coach and having a resistance value of the order of 30,000 ohms, a connection from said cathode to the collector which normally engages the grounded trolley wire, a voltage-sensitive electromagnetic relay having an operating winding included in the last mentioned connec 4 tion, and a signal device controlled by said relay.
2. A charge detector circuit according to claim 1 and including a signal lamp connected in series with the energizing circuit of said cathode heater.
SAMUEL S. STOLP.
References Cited in the file of this patent UNITED STATES PATENTS
US235155A 1951-07-05 1951-07-05 Electric signal for trackless trolley coaches Expired - Lifetime US2658191A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2860244A (en) * 1953-05-11 1958-11-11 Bell Telephone Labor Inc Suppression of arcing in wave guides
US3016525A (en) * 1958-10-07 1962-01-09 Allis Chalmers Mfg Co Leak annunciator unit
DE1162474B (en) * 1961-01-27 1964-02-06 Horst Bayer Circuit for testing the insulation status of a trolleybus operated on a one-sided earthed direct current network
US3141156A (en) * 1961-06-14 1964-07-14 Harry J Freedman Danger indicator
US3987425A (en) * 1973-12-13 1976-10-19 Electronic Surveillance Corporation Leakage resistance detector and alarm circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2360288A (en) * 1940-06-24 1944-10-10 Union Switch & Signal Co Leakage indicator for alternating electric current circuits
US2478147A (en) * 1948-05-19 1949-08-02 Us Rubber Co Electrical protective system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2360288A (en) * 1940-06-24 1944-10-10 Union Switch & Signal Co Leakage indicator for alternating electric current circuits
US2478147A (en) * 1948-05-19 1949-08-02 Us Rubber Co Electrical protective system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2860244A (en) * 1953-05-11 1958-11-11 Bell Telephone Labor Inc Suppression of arcing in wave guides
US3016525A (en) * 1958-10-07 1962-01-09 Allis Chalmers Mfg Co Leak annunciator unit
DE1162474B (en) * 1961-01-27 1964-02-06 Horst Bayer Circuit for testing the insulation status of a trolleybus operated on a one-sided earthed direct current network
US3141156A (en) * 1961-06-14 1964-07-14 Harry J Freedman Danger indicator
US3987425A (en) * 1973-12-13 1976-10-19 Electronic Surveillance Corporation Leakage resistance detector and alarm circuit

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