US931205A - Control system and switch. - Google Patents

Description

H; 1). JAMES. y CONTROL SYSTEM AND SWITGH. APPLICATION FILED DEO.14, 190.8. R.

'MTN ESSESr I QVENT OR I I ATTORNEY HENRY D. JAMES, OF PITTSBURG,

TRIO & MANUFACTURING COMPANY, A

coRroRilTIoN OF PENNSYLVANIA.

CONTROL SYSTEM; AND SWITCH.

Specification of Letters Patent.

Patented Aug. 17, 1969.

Application filed December 14, 1908. Seria1No.467,488.

To all whom it may concern:

Be it known that I, HENRY I). citizen of the United of Pittsburg, in the county and State of Pennsylvania,

new and useful Improvement in Control Systems and Switches, of which the following is'a specification.

My invention relates to controlling switches and systems for electrical translating devices, and particularly to controlling systems and switches Which are utilized for so controlling electric motors that they may be started from rest and brought to operating speed automatically and under such conditions as to avoid injury to either the motor or the starting apparatus. I

It has become common ractice to utilize a plurality of unit switc es in connection JAMES, a

of Allegheny ing and controlling electric motors, and to initially govern such switches by means of a manually operated master switch.

My invention pertains to such apparatus, and it has for its object to provide a simple and efi'ective means wherebythe operation of successive switches in a set or series shall be automatically. delayed a suflicient length of time to prevent such rushes of current to the controlled motor as will tend to cause inury or produce too rapid acceleration.

The single figure of the accompanying drawing is a View, partial-lyinsection, tially in side elevation, and partially diagrammatic of a system of control embodyinc my invention.'

eferring now to the details shown in the drawing, a motor 1 issupplied with energy from a suitable source through line conductors 2 and 3 and a resistance 4 is provided for insertion in whole or in part mto the motor circuit during the starting opera tion. a

As here shown, three automatic switches 5, 6 and? are employed, two ofwhich are alike in construction and the third of which differs therefrom in certain particulars which will be hereinafter pointed out. Each of the switches 5, 6 and 7 is provided with an operating magnet coil or solenoid 8 which is mounted in a suitable frame ,9, and with a stationary armature or core member 10 and -\almovable armature or core member 11, the latter being mounted upon a rod 12 the up-' per end of which is provided with a suitable States, and a resident have invented a 1 with a suitable variable resistance in startea as indicated at 25,

par-

contact terminal piece 13 to engage a similar stationary contact terminal piece 14 when the solenoid 8 is energized 1n av manner to be hereinafter explained.

Connected to the movable armature or. core member 11 is a movable contact bridging member 15 which is adapted to engage a pair of stationary contact terminals 16 and 17 when the movable armature or core. member is raised. The switch 7 is also provided with a pair of stationary contact terminals PENNSYLVANIA, A SSIGNOR TO WESTINGHOUSE ELEC- 18 and 19 to be engaged by the member 15 when it is in its lowest positio Located adjacent to the contact terminals 13 and 14 and at opposite sides thereof, are two blow-out magnet coils 20 and 21 into which project the upper ends of two armature or core members, the lower ends of which are supported upon tlQe @rame 9. In ch of the switches 5, 6 and 7, the armature or core member 22 may be stationary, but the other member 24 is pivoted upon the frame,

and is provided with" a projection 26 to engage a limiting stop 27 when it is moved inwardly by the action of the blow-out coils.

The outer side of the upper end of the pivotally mounted armature or core member 24 is provided with a contact terminal piece 28 in position to engage a cooperating stationary contact terminal piece 29 when the memher is in its outermost position, it being held in this position when the blow-out magnets are denergi'zed, or are energized to less than a predetermined degree, by means of a coilspring 30 the upper end of which-is attached to a lug 31 upon the member 24. The lower end of the spring 30 is adjustably attached to a lug 32 upon the frame 9 in order that the tension exerted by the spring may be ad.- justed to meet desired conditions-of opera tion.

In order to start the motor 1, a master switch 33 is closed manually, thus establishing a circuit from the line conductor 2 through the operating coil 8 of switch 5 and the auxiliary switch 1518-19 to the line conductor 3. The operating magnet coil 8,--

being thus energized, will raise the movable core member 11 and thus bring the contact terminals 13 and 14 into engagement and also close the corresponding auxiliary switch 1516-17, thus establishing a circuit from line conductor 2 through the motor 1, the en tire resistance 4, the blow-out magnet coils and the contact terminals of the switch 5, to the line conductorfi. The volume of current passing through the motor upon the 1n1t1al closing of the circuit will be suflicient to attract the armature or core member 24 against the force exerted by the spring 30 and thus separate the contact terminals: 28 and 29 to 1 prevent energizing the operating magnet 8 oi the switch 6 until the current flowing through the motor becomes reduced to such a degree that the spring 30 will overcome the power exerted by the blow-out magnet and thus bring the contact terminals and 29 again into engagement. Assoon as the contact terminals 28 and 29- come into engagement, a circuit will completed through the operating magnet 8 of the second switch, the

auxiliar switch )ertainin to switch con- . UlCt terminals 28 and 29 and the main terminals l3 and 14 to the negative line conductor The main contact terminals and auxiliary switch of the switch 6 will thus be closed and the main circuit will be through .the motor, one-half the resistance l, the

blow-out coils and the main contact terminals of switch (3 to the negative line conductor, the amount of current'thus caused to flow through ,the said blow-out coils being sufficient to draw the movable core member 24; inward against the action of the spring and thus separate the contact terminals 28 and 29, thereby delaying the operation of the switch 7 until the current-falls to such value auxiliary switch 151317 closed, thus placing a suitable resistance 36L in circuit.

' As so in as the auxiliary switch 15'1819 maintained untilit is desired to stop the mo' is .thus opened, the circuits of the operating magnets of switches 5 and 6 will be opened, and, consequently, the movable members of vtheseswitches will drop and the blow-out m'gnets will perform their, functions of blowing" out the arcs which form between them The closing of the contact member of the switch 7, serves to place its blow-out. magnet in series with the motor and cuts the entire'starting resistance 4 out of circuit, this: being the-@perating condition which is -tor, which may, of course, be effected by na e- 1mg the master switch 33.

Qofar as the e'peratlonand functions thus far described are concerned, the core member 24 of the switch 7 may be immovable,

' and the contact terminals 28 and 29 omitted,

and I desire it to be understood that my invention covers "the system when so constructed and installed.

bince it. may sometimes be found desirable to employ an overload circuit breaker inconnection with a motor-controlling system, 1 have provided theswitch 7 with certain auxiliary devices whereby it may serve as an overload circuit breaker, as wellas one unit of a motor cont-roller. As shown, the

core member 2st is pivotally supported and I is normally held in its outermost position by the spring 30, which must be strong enough to resist every degree of magnetic pull which cur is'less than that caused by an overload rent in excess of what is allowable. The contact terminal 28 is connected to the line conductor 3 and the cooperating contact te'r i'ninal 2 is connected to one terminal of the resistance member 34, so that, when said contact terminals are separated by an excessive magnetic pull upon the member 24:, the circuit of the coil 8 will be opened to permit the main contact terminals 13 and 14 to separate. i

in order to lock the core member 24in its innermost position, I provide the lug 31 with a projection 35 which is engaged by a pivotally mounted latch 36 having a trip arm 37. main contact terminals of the switch 7 after it has performed its cirdi'iitfbreakingfunction, a magnet winding 38, which is connected across the line 2-3, through a normally open switch 39, may be energized by closing said switch and, when so energized, it will raise its coreor armature into engagement with the arm 37 and thus withdraw the latch 36 from the extension'35.

In order to effect closure of the.

It will be understood that the armatures 4 or movable core members for the blow-out magnets may be movable otherwise than as shown and described, and that the'circuits and the forms and relations of parts may be varied within considerable limits without 7 departing from my invention.

I claim as my invention:

1. The combination with a motor anda starting-resistance, of a series of main switches for removing successive sections of said resistance from the motor circuit, each of said main switches comprising an operating coil, a blow-out coil and an auxiliary switch, and all but one of said main switches being severally provided with movable armatures for the blow-out magnets which have means for making and'breaking the circuits of t'he succeeding operating magnets. 2. The combination of a series of main.

switches having operating coils, blow-out coils, and auxiliary switches'f or making and breaking the circuits of the operating coils,

, ,of the operating coils offother switches in some of said main switches .being severally provided with movable blow-out coil armatures which 'have means for making and breaking the circuits of the operating coils of other switches in the-series.

. 3. A series of motor-controlling switches coils, blow-out coils andauxiliary switches and some of which severally comprise movable blow-out coil "armatures which have means for making and breaking the circuits the series.

' In a switch for electr1c-c1rcu1ts,'the combination with separable contact termi- Y Y I x I nals, of a blow-out magnet therefor comprising a winding and a movable armature or core for said blow-out'magnet windmg.

5.; In a switch for electric circuits, thecombination with" separable contact terminals, of a blow-out magnet-comprising two.

I ,coilsadjacent to said terminals and cores or armaturesfor said coils one of which is mov'- able.

6. In a switch for electric circuits; the

combination with contact terminals and meansjfo'r actuating one of them, of a blowout magnet comprlsingtwocoils and cores .or armatures therefor, one .of which is movable and is providedwith an auxiliary contact terminal." 4

' "7. In a switch" for electriccircuits/the all of' which severally comprise operatingfdr I said winding 8. In a switch for electric circuits, the combination with separable contact terminals, and an operating coil, of a, blow-out magnet comprising a winding and a movable armature or core havingian auxiliary contact terminal, a cooperating auxlllary.

contact terminal, a-latch for said movable armature or core, a re-setting magnet and'a governing switch therefor. 9. In a switch for electric circuits, the. combination with a stationary contact terminal, a movable contact: terminal, and an actuatingcoil for the latter, of a blow-out magnet winding adjacent-to said contact termi nals, a spring-restrained movable core or armature for said winding bearlng one contact terminal of-avswit'ch in the circuit of'the main actuating coil, and means ,for locking and releasing said movable core or armature 10. In a switch for electric circuits, the

combination with a stationary contact. terminal, a movable contact terminal and a coil for actuating the latter, of a blow-out magnet windingadjacent to said contact term1 nals, a spring-restrained core or armature 7 that isv movable toward said contact terminals by said winding when energized in excess of a-predetermined de-' gree, a switch i the circuit of said actuating coil one membef-of which is supported by said core or armature, means for locking said 0 e or armature in its magnetically restraine position, and a manually controlled means for releasing said core or armature.

In testimony whereof, I have hereunto subscribed my'name-this'28rd dayof November, 1908. Y I

. HENRY D. JAMES. Witnesses .FRANK M. J. lHURPHY,

BmivnY Hnvns.

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