US897031A - System of control. - Google Patents

Description

No. 897,031 PATENTED AUG. 25,1908. E. W. STULL.

SYSTEM OF CONTROL.

APPLICATION FILED JAN.20,1908.

WNW/yaw M w M W 0% w PQRATION OF NEW JERSEY, AND THE A' CORPORATION OF OHIO. I

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w. s'rUnL. or nonwoon, onto, assietvon TO atuscaannnns conranv, A COR" BULLOCK nnno'reic MANUFACTURING COMPANY,

'SYSTEM or contract...

Specification o1 Lettere'Patent.

1?aten.tecl Aug. 25, 1908.,

Application filed Jannary 20, 1908. Serial No. %11,616.

To 'ail whomit' may concern:

' Be it known that I, Ennnrr W. seen, a

' citizen of the United States, residing at Nor 'ments for preventin Serial No. 324,133, filed June which the followingis a full, clear, and exact specification. "My inventionv relates to controllersv for electric .motors and especially to'arrangeg flashing atthe contacts of railway controllers. This present invention-is an improvementon that shown in'my'co-pending application 30, 1906. It frequently happens, especially when a car is being notched along, that dangerous arcing or flashing occurs at the controller contacts when the controller is moved to off position. Sometimes this arcing'will burn out the controller and absolutel dis I able the car.

. It is the object of my invention entirely to avoid flashing at the controller contacts and to break the motor circuit elsewhere. This attained without requiring any change in o'r addltlon to the controller proper.

Broadly niy invention comprises the combination with a motor controller of a switch from the description and drawings and will be particularly pointed out in the claims.

The single figure of the drawing shows diagrammatically one embodiment of my invention.

The controller shown in this figure may be of any desired type, but is here shown as a series-parallel controller for two electric motors Aand B. The controller drum 15 has operative positions 1 to 13 inclusive and is provided with contact segments cooperating with stationary contact fingers 16 to 28 in- As the controller is moved be tween positions 1 and S the resistance R in the motor circuit is varied with the motors connected inseries. Between positions 8 and 9 the connections of the motors are changed from series to parallel. Between posit-ions 9 and13 the resistanceit IS varied w1th the motors connectedin parallel.

The contact finger 16 is connectedt-o the trolley or other collecting device ,3l. The

contact finger 1.7 is connected to the lower end of the resistance B through the magnetically operated switch S and its blowout coil 32 and operating'solenoid' 36. The solenoid 36, however, is normally shortcircuited by a a second magnetically operated switch 34, which is biased toward closed position. The operating solenoid 35 of the switch 34 is connected in series between the contact fin 'er 18' and. a pointon the resistance R. The

solenoid 36 tends to open the switch S whenever it is energizethbut it is only energized when the switch 34 is open. The switch S is biased toward closed position, and normally held in such closed position bya spring 33. A dash pot or other time limit device 37 retards the closing movement of such switch, but allows a free opening movement thereof.

The operation of my invention is as follows: When the controller is moved into its first operative position the motor circuit is "completed from trolley 31 through contact finger 16, the proper contact segments on the controlling drum, contact finger 17, blowout coil 3'2, switch S, switch 34 short-circuit ing solenoid 36, the whole of resistance R, and the motors A and B to ground. In this position the solenoid 36 is deenergized. 'hen the controller is moved into its second operative position, the lowest section of resistance it and the switch S with its appurtenances will be shunted by the engagementof contact finger 18-and its cooperating contact segment on the drum. This completes iicicntly strongly to operate the switch S.

The further forward movement of the controllcr dcencrgizcs magnet 35 and varies the motor circu ts 111 any desired manner, butthis latter, having nothing to do with my present invention, will not be described in detail. VVhen the controller in its backward movement reaches position 2, magnet 35 is energized to open the switch 34. Upon finthcr backward movement the switch S, solenoid 36, and lowest section of resistance It are first momentarily connected in shunt to the solenoid But as stated above, the resistances of these parts are preferably so proportioned that with this connection the solenoid 36 is no energized sutliciently strongly to open the switch S. However, innnediately after the shunt connection. is made, the contacttinger 18 and the cooperating contact egment on the drum are disengaged, thus throwing the ,whole current through the switch S and solenoid .36, the switch 34 now being open. immediately opens the switch S, the upward extension of its core holding the switch 3% open, and thus the motor circuit is broken at the contacts 29 and 30. Any arcing that takes place at these contacts is extinguisl'ied by the blow-out magnet 32. Upon further backward movement of the controller to oil position no arcing takes place at the controller contacts because the motor circuit is wholl broken. In order to allow the motorman sullicient time to more the controller from [irsl to oil position, the closing movement of the switch S is retarded by the dash pot 37, the opening movement of this switch being unretarded. The switch at which the motor circuit-is broken may be located at an desired place but is preferably so located as to be out of sight of the passer gers.

In some controllers, as in the one shown, the motor circuit is broken as the controller moves between the last series and. the lirst parallel positions. As the motors usually have considerable counter elcctroinotiYe force at this time, thus gear-(l3 reducing sparking which would otherwise take place at the controller, it is generally unnecessary to provide for having the circuit broken elsewhere than at the controller contacts when L However, by a slight this change is made. rearrangeincnt of the parts this can be done if desired.

Many modifications in the particular ar- Tho solenoid. 36

rangernenthere shown and described may be made without departing from the spirit and scope of my invention, and all these obvious-modifications I aim to cover in the ollowing claims.

What I claim as new is A 1.- In combination, a motor controlle z, a switch, a magnet for opening said switch to break the motor circuit, and connections whereby said magnet-is energized only when the controller is moved backward to it's first operative position.

2. In eombinatit'in, a motor controller, a

normally closed switch, a magnet for opening said switch, and means for energizing said magnet only when the controller in its backward movement reaches a predetermined position.

3. In combination, a controller for electric motors, a normally closed switch. through which the motor current is supplied when the controller is in a predetermined position, a magnet for opening said switch, and means for energizing said magnet only when the controller in its backward movement passes through such predetermined position.

et. In combination, a controller for electric motors, a normally closed switch thrmigh which the motor currentis supplied when the controller is in a certain position, anormally shortwircuited magnet which when energized tends to open said switch, and means for opening the short-circuit around said magnet when the switch in its backward movement reaches ,a predetermined position. 5. In combination, a motor controller, a switch biased to closed position and in series with said controller when the latter is in a certain position, a magnet which when energized tends to open said switch, a second switch short-circuitiirg said magnet, a second magnet tending to open said second switch, and means for connecting said magnets in circuit in different positions of the controller. In testimony whereof I afli); my signature, in the presence of two witnesses.

EMMETT "W. STULL.

IYitnesses:

Gno. B. SOHLEY, Fnnn J. Kl'Nsl-IY.

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