US997280A - Electric controller. - Google Patents

Description

A. G. EASTWOOD.

ELECTRIC CONTROLLER.

urmoumu 11.31) SEPT. 24, 1910.

997,280, I Patented July 11, 1911 w u ss s mvma Q52 M W aw WW7 hand or no UNITED oFFioE.

ll, EH19, ASSIGNOR T6 THE ELECTRIC CON- Gil. PANY, CLEVELAND, GHIO, A. CORPORATION 917' CHIS.

1 LECTURE} CQETTRGLLEE;

Q9T BQ A Specification of ILctcers Patent Pggggnfigfl July 11, 1911.

Applicaiion filed Sepceinbei s13. Serial No. 583,536.

To all whom ii may concern: 'ihe operaiing windings 1* to 4 of the Be it known. that I, C wooo, SWilCQQS l to l, which control the sections a citizen of the United S l'fiflQiil oi ch; resistance R in an obvious manner.

Cleveland, the county of Cuyiihom and State of Ohio, have invented new and useful. Improve-meme in Eleciric 4 of which ihe following is a s My invention relates to elect i trollers of that type in which sepsr tucked magnetic swiichcs l the proper connections for s'erhr d1:

xnoi'or, operate it in filifififellh dire; vary its sieed. it sometimes otcurs in operation of such controllers ilrii when iloe master controller is moved to the oil position some one the resistance. cuhou i switches may remain closed no to heavy are which has been formed oi: its contacts which Welds them rogelzh The ohject of my invei Li a controller in which it will h- 3 "co operate ihe main swi'rcl.

of lihc cum:

is closed. A iis may he number of Ways, of which grammatically in the eccoui mg.

On the drawing, if have shown :1 pair o1 reversing switches nd 6 opcnl'cdr, rc-

spectively, by thswi Jigs 5 and having the auxiliary con'tacis o" nd closed when the said switches 12 open The common return from the operating said auxiliary contacts 1 5.0 the lfili;

two end of l e s sistance E, and also unoum). no

$0 the negaiiive main.

left from the ofi position, to connect the winding 5* or 6 to the positive segment on.

If the controller arm 0 be moved so us to engage the segment m current will flow from the posiiive segment m through the arm 0, the segment m, the winding (5, and the resistance r to the negative main, cousing the switch 6 to close its main or mol'o; contacts and to open its auxiliary contacts 6. No curren flows lhrough. 'lihc .i'no'ou' as the arm 0 l /hen lhc arm is moved step by step so as to engage the segments m to m the Wind- 1 lo become successively energized easing the switches l to to close succeslve 3* whereby the motor is caused to short and automatically increase its speed in a man well known.

To stop the motor the arm 0 1S moved to position which is that shown on the v cousin the deiincrgizing of all the iiigs 1 I 7., and 6. All of the q and 6 should open at once en the arm 0 is moved lo he left from s .llf-posiiiou. the operation described will apply cxcepl that the winding 5 will be and the switch 5 will close, causurouziurc A to rotate 'in a reverse ihe ogcning of ll1 auxiliary contacts 5 or (3" "when lhc corresponding switch 5 or 6 closed prevents connecting the lower end of the. winding' 5 or 6 to the positive main, which would make the said winding inoperoiive as hercinbeiiore explained.

I cluim- 1. In a circuit, a resistance, a set of resisiance switches having contacts for conneciing said resistance to one side of a source of current supply :1 main switch for connecting said resistance to the other side of said source an opcraiing Winding for said switch, means including the said contacts for closing 21 short circuit around said windwhen any of said resistance switches "hosed, mica-ms for energizing said which ing when all "of said resistance switches are en, and means for opening said short circuit when said main switch operates.

2. In a motor control system, a circuit containing a motor, a. magnetically operated reverser, a resistance, one or more switches having contacts connected to said resistance, means including the said contacts when said reverser s in its open position for connecting'ho'ch endsvot its operating winding to the same ads of a source of supply when any of the resistance switches is closed.

3. In a motor control system, a circuit containing a motor, a magnetically operated reverser, a resistance, one or more switches having contacts connected to said resistance, means including the said contacts when said reverser is in its open position for connecting both ends of its operating winding to the same side of a source of supply when any of the resistance switches is closed and means for energizing said winding only when all of said resistance switches are open.

4:. In a motor control syste1n,-a circuit containing a motor, a magnetically operated reverser, a resistance, one or more switches having contacts connected to said resistance,

means when said reverser is in its open position'for short circuiting its operating 'w1n ling through thc'said contacts when any of the resistance switches is closed, means for energizing said winding when all of said resistance switchesare open, and means for opening said short circuit when the reverser operates.

In a circuit controller, a magnetically operated switch for connecting an electric circuit.- to one side of a source of supply, means for automatically shortcircuiting the operating winding of said switch to prevent its operation it the circuit is connected at any point to the other side of the source of supply, the short-circuit. being through the said point.

6. In a circuit controller, a magnetically operated switch for connecting an electric circuit to one side of a. source of supply means for automatically short-cirmiiting the operating winding of said switch to preventits operation if the circuit is connected at any point to the other side of the source oi supply, the short-circuit including the said point of connection, and an auxiliary switch operated by said switch for opening said short. circuit when the switch operates.

7. A circuit, two reversing switches therc- For, an actuating winding for each switch. a third switch in the circuit. a circuit including the third switch in shunt with the windings, a resistance in series with eitherwinding and the shunt circuit, the resistance being of a value to prevent sutlicicnt current to flow througheither winding to actuate the corresponding reversing switch when the reversing switches are open and the third switch is closed. and means for opening the shunt circuit when either reversing switch is closed.

S A main circuit, a switch to close the same at one place, a winding to actuate the said switch, a second switch to close the circuit at a second place, a circuit including the second switch in shunt with the winding. a resistance in series with the winding and the shunt circuit, the resistance being of a value to prevent sutlicient current to flow through the winding to actuate the first switch when the latter switch is open and the second switch is closed, and means for opening the shunt circuit when the first switch is closed.

Signed at Cleveland, Ohio, this lgth day of Sept, A. i). 19l().

ARTHUR C. EASTYVOOD.

lVitnesses:

J. H. HALL,

lvi Dianna.

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