US2455901A - Remote control with multiple-speed governor - Google Patents

Description

Dec. 7, 1948. v M. N. YARDENY A2,455,901

REMOTE CONTROL WITH MULTIPLE SPEED GOVERNOR l Filed Dec. 22, 1944 2 Sheets-Sheet l Fieri 21927 IN V EN TOR.

Dec- 7, 1948-- M. N. YARDENY 2,455,901

` REMOTE CONTROL WITH MULTIPLE SPEED GOVERNOR Filed Dec. 22, 1944 2 Sheets-Sheet 2 l 35j l 15e V |58 -l 157 7 a, ,44 4 40 o7 10+ 4l /2 50Euro-l5 I' ,los

IN V EN TOR.

Patented Dec. 7, 1948 UNITED STATES PATENTv OFFICE REMOTE coN-'rRoL WTHMULTIPLE-SPEED- GovERNoR Michel N. Yardcny, New York, N; Y.

ApplicationDecember 22, 1944SerialNo. 569,309

8 Claims. l

This ,invention relates to remote control systems forenerglzing a motor to. place an object or load at a desired point or position.Y More particularly, the invention 'relates to governing means for regulating'tlie speed ofthe load motor.

The prime object ofthe invention is to provide meansin a remote control system for holdingthe motor speedat a considerably reduced limit duringthe-short interval of time during the stopping of' the l'oad' at' the desired'end point; at other times, the. load. motor rotates at its normal running speed, which is also regulated by the irnproved` governing means of'thi's invention. By limiting motor speed' t'o the reducedlimitduring the interval of stopping, inertia .effect which would otherwise cause overrunning and hunting, may be greatlycut down.

For the attainment ofthisand such other objects. as may appear orY be pointed. out. herein, I have shown a number ormodied forms kof my invention in the accompanying drawings, wherein:

Fig. l is a diagrammatic view. of.. afremote controll system embodying the improved governing means of thisinventom in `which the improved governing. means is. associated' with the contact arm ofthe primary controlling device; n

Fig. lA is a fragmentary portion ofthe' circuit of Fig. l showing a governor having only a reduced-speed element;

Fig, 2 is a similar diagrammatic View, but showing. a modifiedl forminwhichthe improved governing meansincludes anins'u'lated disc andcontact arm separate from tl'iel insulated disc and Contact `arrntoi the primary. controlling device;,and

Fig. 3 isa diagrammatic front` View of a composits insulateddisc for both the primary control contact arm and the Contact arm of the improved governing, means. v

Referring rst to Fig., l", theL improved remote control system ofthis invention comprises are- Versible electric motor generally designated I, the armature 2. of which .is connected 'by gears 3,` 4 withl a useful load 5i The motor fieldcompris'es reversing. WindingA "l, 8, each individually connected in. series wtlitlie armature 22 The motor I is.. shown of4 a series wound type although any? other suitable type. of 'motor can be` used, A.-Clv or D.C. rllfiecon-trol for load motorjl is located at a control point, which may.` be remote from the motor, and comprises apair of Mrelatively movable members. One ofy the pair of. members is an insulatedY disc. I2 rotatively mounted on ashaft I 3i and carrying. electricalt conducting elements in the formfof metalsegments I0 yand-l I', theupper 2 adjacent ends of'which are separated by a gap I4. The other of the pair of members is a contact arm I5' secured to rotate with shaft I3` and' provided with a contact I8 slidably engageable with the conducting segments l0. and II.

The segments Il), I'I are connected to collector rings HL; Il,V respectively, engaged' by brushes 2U', 2l', connected by leads 22',` 2'3- to 'one end' of. th respective field windings Tand a'. The otner'enld's of the' windings; have a 'common lead" 2X to the armature circuit, which will be more fully described subset;uentl'y.,A

Contact arm. I5V is. connected by. a lead 24' to a wirey 'and through a 'switch 2 6` t'o one terminal 21 of a source lof'current y28, iThe other terminal 29d-s connected: through a switch 3l and leads 32', 33A toa relay armature. 311;. normally engaging a Contact point 35, connected by 'a lead 36 to a contact brushv 31j or 'a rotary speed governor. The latter comprises ani'n'sulated disc 4I secured' to rotate with a shaft 42 which is an extension of the armature 'shaft of motor I. Disc 4l carries 'a collector 'r'ing 4D' engaged by said. contact brush 31 an'd'electrically connected to a switch arm 43, the lower 'en-drei which iasshown in Fig. 1") is pivotal'l'y mounted' on disc 4I.; conveniently, the col- Y lector ring 4U, is shown 'connected at the pivoted endof'swi'tch' arm143 Switch 'arm 43' is arelatv'ely heavy spring, by reasonv of which its distal end normally engages a contact point `t which" is connectedto a second collector ring 46. The latter rin'gis engagedby a Contact brush 4.1' clonnected by lead 4'8", through the coil of a conventional' electromagnetic clutch and/or brake 5U', to

. th'e'arniature circuit, which includes armature 2 when centrifugal force acting on switch arm 43 causes it tjo move outwardly away from contact ai;` To augment this centrifugal action the distal end o'f` arm A'Sfmay 'beweig'nted as indicated at 4'4.

Current supply` switches 25 and 3| are closed for placing the apparatus in operation. To start load motor- I,` contact. arm I5. is moved, by knob` l25 secured to shaftv I3. or by other instrumentality, away from normal position (as shown in Fig. 1) inwhich'itscontact I8 is disposed, at gap, I4and thusengages neither one of segments 3 III and II, to a position in which i8 engages one of the pair of segments, depending upon the direction in which it is desired motor I to rotate. Assuming that arm I5 is turned clockwise to engage its contact IS with segment Ii, a circuit is completed from terminal 21, through closed switch 26, leads 25 and 24, contact arm I5 and its contact I8, to seginent II and through its collector riiig I1 and brush 2l, lead 23 and ield winding 8 of motor l, common lead 2X, armature 2, electromagnet coil 58, lead 48, brush 41, inner collector ring 48, Contact 45, centrifugal switch arm 43, outer collector ring 48, brush 31, lead 36, contact 35, relay armature 34, leads 33 and 52, closed switch 3i and thus back to the other terminal 28. Load motor I thus rotates, in the selected direction, until. gap I 4 is again brought into alignment with contact arm I5. Insulated disc I2 is rotated, in a direction to enable gap I4 to overtake the selectively adjusted arm I5, by a pilot motor 88, the

armature 98 of which is secured on a shaft 95. At the right end of shaft 85 is secured a toothed or friction pinion Si which drives a gear E38 secured to insulated disc I2.

Pilot motor 89, in addition to its function in rotating disc I2 (as just explained), also functions in synchronizing instrumentalities for causing load motor I to stop in a position corresponding to the selectively adjusted position of contact arm. I5, which will now be described. Shaft d2 of load motor I rotates, through suitable gears 52 and 53, a shaft 54 to which is secured a contact arm 55. Contact arm 55, which is part of a commutator device at the remote point, is provided at its distal end with a contact 56 slidably engaging a plurality of concentrically disposed, stationary contacts 51, 58, 59, 6I) and others not designated. The stationary contacts are individually connected by wires 65 to corresponding contact brushes 66, 61, 68, etc., at the control point, which are engageable with one or the other of a pair of conducting segments 14 and 15 mounted on an insulated disc 16 rotatable about a shaft 11. Adjacent ends of segments 14 and 15 are separated by gaps 'I8 and 19 which are wider than the contact brushes 66, 61, etc., so that the lbrushes are ineffective to bridge the gaps and Contact both segments simultaneously. Segments 14 and 'I5 are connected to collector rings,

respectively, BI and 82, engaged by their respecf tive brushes 83 and 84, which are connected by leads 85 and 86, to one end of respective reversible eld windings 81 and 88 of the aforementioned pilot motor 89. The other ends of windings 81 and 88 are connected by a common lead to the armature circuit, which includes armature 88 and the coil of a conventional electromagnetic clutoh and/or brake 92 associated with pilot motor 89, and connected by short lead 9| to Wire 32 which, as already described, leads to one terminal 29 of the current supply. The circuit justtraced, going through one or the other of reversible windings 88, 89 depending upon which one of the pair of segments 14 and 15 is engaged by an energized stationary brush 6'6, 61, 68, etc., is completed through the engaged segment (14 or 15) and the energized brush (66, 61 or 68, etc.), its respective wire 65, to the corresponding stationary commutator contacts 51, 58, 59, 68, etc., and thus through rotatable contact 56 to contact arm 55. Contact arm 55 is connected through lead 25 back to the other terminal 21 of the current supply. The aforementioned disc 16, which carries segments 14 and 15 of the pilot motor control device is rotated by pilot motor 89 by means of a toothed or friction pinion 96 secured on the left end of shaft 85 and meshing with a gear 91 secured to rotate with disc 16.

It has already been explained that the displacement of contact arm I5 either to the left or right of its normal position-(as shown in Fig. 1), in which its contact I8 is at gap I4 between conducting segments I8, II-will cause load motor I to rotate in the desired direction. Rotation of the load motor will cause a concurrent turning of commutator arm 55, which is instrumental in causing a synchronized turning of pilot motor 89, in the following manner: When rotatable arm 55 of the commutator is in the position shown with its contact 56 engaging stationary contact 51, disc 16 of the pilot motor control device being at its corresponding synchronized position with brush 66 (which corresponds to stationary contact 51 of the commutator) at gap 18, the circuit (previously traced) is broken at brush Gli-gap 18. Rotation of load motor I now turns commutator arm 55 clockwise to engage its contact 56 with the next stationary contact 58, and thus to complete the circuit through the corresponding brush 61 of the pilot motor control device, segment 15 and through its associated field winding 81. The resulting rotation of pilot motor 89 causes a concurrent turning of both insulated disc I2 and insulated disc 16 of the pilot motor control device. Disc I2 is turned in a direction to cause gap I4 to overtake the displaced contact arm I5 and to cause its contact I8 to be free of both segments I8 and I I, thus breaking the circuit to the eld winding 8, and thereby bringing load motor I to a stop.

Disc 16 of the pilot motor control device is likewise turned in a direction to cause gap 18 (as shown in Fig. l) to reach stationary brush 61 (which is in energized condition, as described above, by reason of the engagement of commutator contact 56 with the corresponding stationary contact 58). The brushes 66, 61, 68, etc., being narrower than gaps 18, 19, the arrival of gap 18 at energized brush 61 will break the circuit to eld winding 81, thus bringing pilot motor 89 to a stop.

The turning of commutator arm 55, by load motor I, to bring its contact 56 into engagement with successive ones of the stationary contacts 51, 58, 59, etc., will cause a synchronized turning of pilot motor control disc 16, by its energization of pilot motor 89, gap 18 reaching the energized one of the brushes 66, 61, 68, etc., corresponding 2 to the engaged commutator contact 51, 58, 59 to break current supply to the pilot motor. Concurrently thev pilot motor rotates insulated disc I2 to bring gap I4 progressively nearer to the contact arm I5 in its selectively advanced position. Current is continued to be supplied to the load motor I, thus causing commutator arm 55 to continue to turn and engage successive commutator contacts 51, 58,. 59, etc. This stepped advance of commutator arm 55 and pilot motor control disc 16 will continue until gap I4 reaches the contact arm I5, at which time the load motor will be stopped, thus stopping the commutator arm 55 at its last engaged commutator contact and stopping disc 16 with the last corresponding brush at its gap 18.

Contact arm I5 is provided with a pointer |23 which cooperates with a fixed circular scale |22 to enable the operator to place the load at the desired end point, Without the use of a backindicator since the position of the load is di- @Nimmt 'rectlwor proportionally.- synchronized. with confk tact arm; L5.r

l Piyoted switchy arm. 43 hasbeen described` above asforming partoiar-otaryspeed governor. More particularly, centriiugally-.influenced arm 43l is effective; to break thel circuit to load motor I when. its. speed. exceeds. a predetermined normal runningv speed. It has been found desirable that themotor rotate ata. considerably reduced speed duringy the interval. approaching the stopping of; ther load: at; the desired end point, in order m. reduce inertia, effect which:Y would, otherwise callseoverrunning. and. hunting. For this, purpose, aseeond, switch arm ||J 5v is pivotally mounted; on rotary disc 4| of thaspeed governor with itsdistalxend normally engaging contact |04, connected in common with` contact 45 of the switch amm. 4.3. to...col1ector ring 40. Switch arm |05 is, a cnsiderably weaker spring than 43. and, in additioncarries a heavier Weight |06 at its distal withal; weight 4.4; of switch. arm 43, so that it will move outwardly awayfrom itscontact IM. at. a. Speed. considerably less than thenorrnal runrn'ngspeed at. whichv switch arm 43. functions. 'lhepiyoted end` of reduced-speed arm |05 is connected to a collector ring |01, engaged by a brush; Iilgwhich is connected by lead |09 to a contact, point 0; associated with relay armature 3.4.,Wllih hasnreviously been described in con nection, withthe circuitto normal-speed arm 43. Relay armature 3 ,4 is associated with a relay 5,0.l;1. 'Germinal of which is connected through lead-32 to,A one terminal 2Q of thecurrent source; the other,r relay terminal is connected through lead |45, to rbrush |;|f1 engaging a collector ring |.I8 carried on disc' I2; and connected to a pair Qtcontacts. |.;|-.9 separated by a gap |20. Contact arm, I5, carries-.a supplementary contact |2| which engages one,v orthe other of the disc contacts U8 simultaneously with the engagement of the disc segments |10, by contact I8 of contact Emili As previously described, the circuit to the load 3101101. is brokenv when gap 4 overtakes contact lgoithe Contact` arm I5. But before this occurs, one or .the other ofV the pair of contacts IIS. of

IIL-(dependingupon,` the direction of rotation) will have engaged supplementary contact |2|`, to. oo rmnlete.A a circ-uit from one terminal 21 of the current source, through lead 24'-, arm I5, its supplementary contact |2I, contact H9, collector ring H8, brush ||-1, lead- Hi, relay ||.5, and through lead 32 back to the other supply terminal 2,9.` The resulting energization of; relay |:I5 will attract relay` armf 31|. away from contact point 35., with which it is in normal contact, and into ene gagement with contact point H0, thus breaking the said circuit to 43 and completing a circuit through collector ring |01, to the reduced-speed switch arm |05. Thus, for the short interval that supplementary contact |2| is in engagementwith contacts ||9, H9 (which, incidentally, occurs not only when thev gap I4 approaches contact' arm I5 in stopping the load motor, but also occurs whenrthe contact arm I5is displacedaway from gap I4 in starting the motor), motor speed will bey held down to the desired reduced limit by switch arm |05.. Instead of a pair of supplementary contacts ||9,| I9 separated by gap` |20, a. single supplementary contact may be provided. The advantage of a pair ofA contacts resides in the fact that when contact |2| isl at the gap, the relay will be deenergized, thus saving current. which otherwise would be'wasted The improved speed regulating means ofrths inventionrmiy; if..desired, dis-pensewfh. the flore malfspeed: governor.v arm-V and, limit. 111011,01-` Speed only during-.the stopping of, the motor as theloalv approachesthet desired end. point. This is illustratedinlig. lawhiehisa fragmentary portion ofrthe circuitdiagrarnof'ig. 1*wherein the cor,` responding;l superseded. portion is shown boxed bra depend-.dash rectanele- Only-the-reduced-` Speed switch. lrand. its Contact |04.- are present. ont insulated1disc4 4|". Lead. 36.X from 11e.- lay contact 35, instead of going to normal-speed collector rine., asinEig.. 1. is connecteddirectly to.; wire48. leadinato the motor armature... AS. i.r.1..Fie.. 1l relay lrlyis energized, when Contact l5.. napprqaehine gap I4. engages supplecontacts |19.; HMO attract relay arma.- S; t0. eneaeerelay Contact Ill! and com: pletetheci-reuitto reducedrspeed switch. arm |05.. Atallother timsrelay l I5. is deenergized s0 that its; ermatu-r. 34. engages Contact 3.5.; this Circuit tlilouehleadf: ianecessary t0 complete the m0- tor Ciresiit 110 supplie terminal 21..

The System 0i- Eief- 2:. differs from that of Fig.. 1 described above, principally in the arrangement im @Peretlieithenormal-speed Switcharm 43 and is mechanically connected withdisc |:2 toI rotate therewith; this is diagrammatically shown in Fig'. 2-by broken lines |46. Disc |45 mounts a circular metal. plate |48 having a peripheral recess. |49 Acontact arm; L58 is,` like Contact arpa; |5l` secured, to slfiaftV 3 in a predetermined angular rel-ation to. contact arm I5, and is electrically connected thereto, as diagrammatically indicatedby lead |35. The distal. end of contact arm. |50 is engagedwithcircular plate |48 except at its recess L49, Circular plate |48 is connectedl by shqrtlead |51," toacollector ring I5I, engaged by a. brush |521 which is connected by leadv |53, toene terminal of relay ||5, the other terminall o f whichisJ connected by short lead |54 to wire 32,1eading to` one supply terminal 29. The relay circuit to the other terminal 21 is completed through leads 25., 24, and contact arm |50. (whenl its distalr end is not disposed in recess |49 of circular plate |48). Relay ||5 when energized, as just deribed, attractsrelay armature 34 to c0111-, plete a circuittd the reduced-.speed switch arm |15.'r rlhe distal' ends. or switch arms 43 and` |05 are normally engaged with contact points, respectively, 45ans 4.0.4, wl1ich are connetedto collector ring V46 leading ,through brush 41, to the armature circuit .o f(l load motor I, precisely as in Fig. l. Also as inV Fig. 1 the pivoted. end of, switch arm 43 is connected tot collector ring ,4.0, while the pivoted end of switch, arm |0,5,`is connected-to collector, ring |01. The remainder of the circuits from the normal'fspeed collector ring 40. and the reducedspeed coliector ring |,|L1 diier from that of Fig. 1 and will now be described. Collector ring |ll1l of the reduced-speed arrn |115, isengaged by. brush |08 which is connected by short lead |43, to Wire 25 which leads back to supply terminal 21. Hence current is always supplied tothe reduced-,speed governor. On the other hand, current is supplied to. the. nor-mala orl highspeed arm 43 at all times except when contact arm I is close to gap I4. The normal-speed circuit is traced from normalspeed collector ring 40 through brush |59 and lead |42 to relay armature 34, to relay Contact |68 (when relay I|5 is energized), and through lead |6| to current supply Wire 25. It is thus seen that governor arms 43 and |05 are in parallel circuits, one common juncture being at short lead |43, the other common junction being at the collector ring 46 leading to the armature circuit of motor I.

Recess |49 of circular plate |48 is so disposed relatively to gap I4 that contact arm |50 will be at recess |49 when gap I4 is at, or close to, the contact arm I5 (as diagrammatically shown in Fig. 2). It is at this time, more particularly, when gap I4 approaches Contact arm I5 (to stop the load motor) that it is desirable that the motor rotate at reduced speed. The circuit to relay I I5 is broken when contact arm |50 reaches recess |49 (as shown) to deenergize the relay and per- ;mit its armature 34 to disengage contact |60 (under urgency of a spring, not shown); this 'breaks the circuit to normal-speed arm 43. It is 'thus seen that only the reduced-speed arm |05 'is effective to govern motor speed when gap I4 :approaches contact arm I5, and hence will hold motor speed to the desired reduced limit.

When gap i4 is not close to contact arm I5, at which time there is no need to hold motor speed down to the reduced limit, the contact arm |50 will have been displaced relative to recess |49 .and will engage the circular plate |48 to complete the circuit to relay II5. Energization of relay ||5 will attract its armature 34 to complete the normal-speed circuit. It was explained above that current is always supplied the reduced-speed arm |05; hence in the normal running condition of the motor. current will be supplied to both arms 43 and |05 (in parallel circuits, as explained above). However, the reduced-speed switch arm |05 will move outwardly away from its contact |84 when the motor speed exceeds the reduced limit, thus leaving the normal or high speed switch arm 43 effective to govern motor speed.

One of the incidental differences between the systems of Figs. l and 2 concerns the energization of reversible field windings I and 8 of load motor I. In Fig. 1 the iield windings are connected directly to the collector rings of their respective segments I0, |I of insulated disc I2; in Fig. 2, a pair of relays |32 and |33 are interposed. One Iterminal of relay |33 is connected by lead I3| to collector ring il of segment I I, while one terminal of relay |32 is connected by lead |30 to collector ring I6 of segment I0. The other terminals of relays |32 and |33 are connected by short lead l34 to wire 32 leading back to the current source. Armature |37 of relay |32 normally engages contact |40 leading to eld winding 'I while armature |38 of relay |33 normally engages Contact 14| leading tc field winding 8. Energization of relay |32 will attract armature |31 to engage a contact |35 on current supply wire 32, thus completing a circuit from current source, through relay armature I3'I, a connecting lead |56, and the other relay armature |38, to contact |4| and thus to eld winding 8. If the other relay |33 is energized, its armature |38 will be attracted to engage a contact |36 on current supply wire 32, to supply current to the other eld winding 'I via relay armature I3'I which remains engaged with its contact |40.

As described above, the circular plate |48 during normal running of the motor when the load* end point is not being approached, is engaged by contact arm |50 to maintain relay ||5 energized to attract its armature 34 to complete the circuit to the normal-speed switch arm 43. The reverse arrangement may be used, in which relay ||5 is normallyi. e., when the load end point is not approached-deenergized; in this case the active relay contact will be the lower one (instead of the vupper contact |60, as shown) so that the circuit to the normal-speed switch arm 43 will loe normally completed. The circular plate |48 would be dispensed with entirely so that the cir-l cuit to relay ||5 will be broken during normal running. The insulated disc |45 would bear merely a small contact plate (not shown) substantially the size and shape of recess |49 and engageable by contact arm |50 when the load end point is approached, to energize relay ||5 to attract relay armature 34 away from the lower (and active) contact, thus breaking the circuit to normal-speed switch arm 43.

In instances where the total range of angular load'displacement is less than 90 in either direction from a normal rest position, the segments I0 and of disc I2 and the circular plate |48 of disc |45 may be combined. in a single disc |69, Fig. 3, in which segments I0 and II find their counterparts in the form of arcuate segments |66 and |67, respectively, each less than 90 and occupying the upper half of the disc, the adjacent ends of the two segments being separated by gap I4. Circular plate |48 nds its counterpartin an arcuate segment |68 which occupies the lower half of disc |69 and which is provided with a centrally disposed recess |49x in its inner arcuate edge. Contact I8 of contact arm I5 engages segments |66 and |61; the distal end of a contact arm |50X, which is a diametrically opposite extension of the contact arm I5, engages the segment |68 except in the central position shown, in which the distal end of arm |50x is disposed within recess |49X. Segments |66 and |61 are connected to collector rings, respectively, I6 and II while segment I 68 is connected to collector ring'|5|; these collector rings and the contact arms I5 and |50X are connected in a Wiring diagram precisely as shown in Fig. 2, and hereinabove described, the operation being the same.

The reverse arrangement suggested above in connection with the circular plate |48 and recess |49 of Fig. 2, may be employed in, Fig. 3 (with similar changes in the active contact of relay I I 5) by replacing segment |68 by a small contact plate (not shown) substantially the size and sha-pe of recess |49x.

As has been previously explained in connection with Fig. 1 the arrangement shown in. Fig. 2, with either separate discs I2 and |45 or with the composite disc |69 of Fig. 3, may eliminate the normal-speed switch arm 43 and function to limit motor speed only during the stopping of the motor as the load approaches the desired end point. In this case, the rotary governor and ycircuit will be quite similar to that shown in Fig. 1A eX- cept that relay armature arm 34 will engage contact 35 when the relay is energized and will engage contact ||0 when deenergized (just the reverse of that shown in Fig. 1A). Recurring to Fig. 2, during normal motor rotation, i. e. when load end point is not being approached, relay ||5 would be energized to attract its armature 34, Fig. 1A, into engagement with contact 35 (as stated above, in the reverse of the armature operation shown) to complete the circuit through collector ring 46 to the motor. As the load end pointis approached, the circuit toirelay Hvwill be broken at recess |49, Fig. 2, so that relay armature 34 will now engage contact Hill .(Fig. 1A, with the reversed armature arrangement mem tioned above) to :complete the `circuit through collector ring 101 to the reducedespeed switch arm 105. I

I claim.:

l. In-a remote control :system for .placing a load at any desired end point, in combination, a .pair of relatively movable members, one of the members having electrical conducting elements separated by a gap, the other member having a contact element slidably engageable with the said conducting elements, a `motor for moving the load, circuit :means including the said motor and elements and a source of current supply, one of the said vpair of :members 4being selectively radjusted toA cause displacement between said rgap and contact element and engagement thereof with one or the other of the said conducting elements depending upon the direction jin which it is desired the motor to rotate, means under control of the load motor for turning the other member ci the pair lin-a direction to cause alignment of contact element and the said gap to stop the motor,` a rotary speed governor driven by the said motor, contacts on the governorV connected to the said motor circuit, a pair of switch arms mounted on the lgovernor and spring .urged inlto l engagement with the said contacts, the said pair .of switch arms being Vdistally Weighted, th'e :said :springurgedarms and `distal lweights being arranged, to cause one of the said pair of switch :arms .to disengage Vits said :Contact :at anpredetermlined normal running speed and toccause the .other switch arm to disengage its contact at a reduced speed, a relay having an :armature connected to .one supply terminal andengageable with one or the other of a pair of contacts, ythe .said v.normalspeed switch arm being connected to one of the said relay contacts Tand the said ,reduced-speed arm being connected Ato the other Vrelay Contact a pair of supplementary contacts carried on one of the said pair of relatively ymovable members one onlea'ch 'side'.ofthesaidsgapfand.adaptedto be engaged by the other of .thenrembers the said other member :being 'connect-'ed to one .supply terminal, circuit ymeansfincluding the said :relay .andfpair of 'supplementary 'contacts'.and the vother supply terminal whereby vthe 'relay will be energized'when'the memberslof said .pairare close to v alignment of contact .element and rgap, `sai-d vrelay armature being engaged -in .the deenergized condition of the relay with the said relay contact leading to the normal-speedfgovernor armwhereby when `the members of said pair are `not close Ato l.alignment the .said normal-speed -governor will be operative, land :the armature being lengaged in the energized condition of the relay with the said .relay `contact leading to .the reducedspeed governor -arm whereby when the members of said pair ,are close to falignment vthe said reduced-speed governor lwill Lbe operative.

2. In .a remote control .system 'for placing a load at any desired-end point, :in combination, la pairiof relatively movable members, Yone :of the members having 4electrical conducting velements separated by a gap, .the .other member having a contact elementslidablyengageable-with the said conducting elements,.a motorforimoving the load, circuit means including-.thesaid motor and ele- ,ments .and 1a. source-ocurrent supply, `one, of the -saidpairof members being selectively adjusted to cause displacement between said gap and contact element and engagement thereof with one or the other of the said conducting elements des pending upon the direction in which it is desired the motor to rotate, mean-s under control of the load motor for turning the other member of .the pair in a direction to cause alignment of contact `element and the said gap to stop the motor, a rotary -speed governor driven by the said motor, a contact on the governor connected to the said motor circuit, a switch arm mounted on the gov ernor and :springurged into @eng-agement wit-h the said contact, the said arm being distally weighted, the said spring-urged :arm and distal weight be ing arranged to cause vsaid switch-:arm toV disen vgage lits said contact vat a predetermined reduced speed, a relay having an armature connected to one supply tei-minalwand cangas-.cable with one .or the other of a vpair of contacts, the said ,switch arm being vconnected to one of :the said 'relay contacts, the otherzrelay contact 'beinguconnected to the said motor circuit, a pai-1' of supplementary contacts carried on one ci the said pair of rela tively movable members one .on cachside ofthe said gap and adapted to beengas'ad by the other of the members, the said `other member heir-1g connected to one supply terminal, `circuit means including .the `said relay and pair of .supplementary contacts and the other suppl-y terminal whereby the relay will be energized when the members kof said pair areclose to alignment Iof Contact element and gap, said relay `armature being engaged vin the deenergized :condition :of the relay with thesaid lrelay Contact' leading ,toy the motor circuit, ,and .the'armatfure being engaged in the energized .condition .of the rela-y with the said relay contact leading .to thewreduced-speed ygovernor .arm whereby 'when the members .of .said pair are .close to alignment .the said reduced speed governor will -be operative.

`3. In -.a remote control system for placing a load at any ldesired end point, in combination, a pair ,of relatively movable members, 'oneof the members having velectrical .conducting .elements separated by a gap, :the other :member having a contact element slidably engageable withithe said conducting elements, .a motor Afor moving fthe load, circuit means including the `said motor and elements and .a source .of .current supply, .one of the said pair vof `members being selectively .adjusted to cause displacement -:between said gap .and contact lelement and :engagement thereof with one 'or-.the other ,of the said conducting eleymentsdepending upon the vdirection in which vit lis desired .the .motor V.to-rotate, uneans undercontrol .of the load motor `for turning the other .member of the pai-r in a direction at@ .cause alignment Aof :oontact/elementand the said gap to stop the motor, a rotary speed .governor driven by ithessaid motor, contacts on thegovernorconnected 'to .the

fsaidmotorcircuitfa :pair of :switchzarms mounted on the governor and spring iurged intofengagement with 'the' said contacts, the ysaidfpair `,of switch arms being distally Weighted, the vsaid `spring-urged arms and distal `weights :being'zar- @one ,of the secondsaid ypair ,of .members having a .conducting surface ,provided t-witha recess. the

other member of the pair having a contacting element engageable with the said conducting surfacey the members of the said two pairs being angularly associated so that the contacting element of the second pair will be disengaged at the said recess when the members of the first said pair are close to alignment of contact element and gap, the contacting element of the second pair being connected to one supply terminal, a relay having an armature connected to the said supply terminal; a circuit including the said contacting surface of the second pair, the said relay and the other supply terminal whereby the said relay is energized except when the said contacting element is disengaged at the said recess, a second circuit including the said normal-speed governor arm, the said relay armature and a supply terminal so that current is supplied to the normal-speed governor arm except when the said contacting element is disengaged at the said recess whereby no current is supplied to the said normal-speed governor arm when the members of the rst said pair are close to alignment of contact element and gap, the reduced-speed governor arm being directly connected to a supply terminal so that current is constantly supplied thereto during motor rotation whereby only the reduced-speed governor arm is eiective when the members of the iirst pair are close to alignment.

4. In a remote control system for placing a load at any desired end point, in combination, a pair of relatively movable members, one of the members having electrical conducting elements separated by a gap, the other member having a contact element slidably engageable with the said conducting elements, a motor for moving the load, circuit means including the said motor and elements and a source of current supply, one of the said pair of members being selectively adjusted to cause displacement between said gap and contact element and engagement thereof with one or the other of the said conducting elements depending upon the direction in which it is desired the motor to rotate, means under control of the load motor for turning the other member of the pair in a direction to cause alignment of Contact element and the said gap to stop the motor, a rotary speed governor driven by the said motor, a -contact on the governor connected to the said motor circuit, a switch arm mounted on the governor and spring urged into engagement with the said contact, the said switch arm being distally weighted, the said spring-urged arm and distal weight being arranged to cause the switch arm to disengage its said contact at a predetermined reduced speed, a second pair of relatively movable members, individual ones thereof being arranged to move concomitantly with respective ones of the first said pair of movable members, one of the second said pair of members having a conducting surface provided with a recess, the other member of the pair having a contacting element engageable with the said conducting surface, the members of the said two pairs being angularly associated so that the contacting element of the second pair will be disengaged at the said recess when the members of the rst said pair are close to alignment of contact element and gap, the contacting element of the second pair being connected to one supply terminal, a relay connected to the said supply terminal; a circuit including the said contacting surface of the second pair, the said relay and the other supply terminal whereby the said relay is energized except when the Said Comi/.2WD-

ing element is disengaged at the said recess, a second circuit including the said governor arm, the armature of the said relay and a supply terminal so that current is supplied to the governor arm when the said contacting element is disengaged at the said recess whereby no current is supplied to the governor arm when the contact element and gap are out of alignment, the motor being then directly connected to a supply terminal so that current is supplied thereto during motor rotation.

5. In a remote control system for placing a load at any desired end point, in combination, a pair of relatively movable members, one of the said members being an insulated disc having a pair of arcuate conducting elements each less than of a circle and separated by a gap, the other member having a Contact arm provided with a contact element slidably engageable with the said conducting elements, a motor for moving the load, circuit means including the said motor and elements and a source of current supply, one of the said pair oi members being selectively adusted to cause displacement between said gap and Contact element and engagement thereof with one or the other of the said conducting elements depending upon the direction in which it is desired the motor to rotate, means under control oi the load motor for turning the other member of the pair in a direction to cause alignment of contact element and the said gap to stop the motor, contacts on the governor connected to the-y said motor circuit, a rotary speed governor driven` by the said motor, a pair oi switch arms mounted` on the governor, and spring urged into engagement with the said contacts, the said pair of switch arms being distally weight-ed, the said spring-urged arm and distal weights being arranged to cause one of the said pair of switch arms to disengage its said contact at a predetermined normal running speed and to cause the other switch arm to disengage its contact at a reduced speed, the said insulated disc having an arcuate conducting segment less than of a circle and provided with a centrally disposed recess, and the said contact arm having a contact extension slidably engageable with the said conducting segment except at its said recess, the said composite contact arm of the pair of relatively movable members being connected to one supply terminal, a relay having an armature connected to the said supply terminal, a circuit including the said conducting segment, the said relay and the other supply terminal whereby the said relay is energized except when the said Contact extension is disengaged at the said recess, a second circuit including the said normal-speed governor arm, the said relay armature and a supply terminal so that current is supplied to the normalspeed governor arm except when the said contact extension is disengaged at the said recess whereby no current is supplied to the said normalspeed governor arm when the members of said pair are close to alignment of contact element and gap, the reduced-speed governor arm being directly connected to a supply terminal so that current is constantly supplied thereto during motor rotation whereby only the reduced-speed governor arm is effective when the members of said pair are close to alignment.

6. In a remote control system for placing a load at any desired end point, in combination, a pair of relatively movable members, one of the said members being an insulated disc having a pair of arcuate conducting elements each less than 90 of a circle and separated by a gap, the other member having a contact arm provid-ed with a contact eleinent slidably engageable with the said conducting elements, a motor for moving the load, circuit means including the said motor and elements and s u ce of current supply, one of the said pair of members being selectively adjusted to cause displacement between said gap and contact element and engagement thereof with one or the other of the said conducting elements depending upon the direction in which it is desired the motor to rotate, means under control of the load motor for turning the other member of the pair in a direction to cause alignment of contact element and the said gap to stop the motor, a Contact on the governor connected to the said motor circuit, a rotary speed governor driven by the said motor, a switch arm mounted on the governor and spring urged into engage-- ment with the said contact, the said switch arm being distally weighted, the said spring-urged arm and distal weight being arranged to cause the switch arm to disengage its said contact at a predetermined reduced speed, the said insulated disc having an arcuate conducting segment less than 180 of a circle and provided with a centrally disposed recess, and the said contact arm having a contact extension slidably engageable with the said conducting segment except at its said recess, the said composite contact arm oi the pair of relatively movable members being connected to one supply terminal, a relay connected to the said supply terminal, a circuit in'w cluding the said conducting segment, the said relay and the other supply terminal whereby the said relay energized except when the said contact extension is disengaged at the said recess, a second circuit including the said governor arm, the armature of said relay and a supply terminal so that current is supplied to the governor arm when the said contact extension is disengaged at the said recess whereby no current is supplied to the said governor arm when the contact element and gap are out of alignment.

7. In a remote control system for placing a load at any desired end point, in combination, a pair of relatively movable members, one of the members having electrical conducting elements separated by a gap, the other member having a contact element slidably engageable with the said conducting elements, a motor for moving the load, circuit means including the said motor and ele ments and a source of current supply, one of the said pair of members being selectively adjusted to cause displacement between said gap and contact element and engagement thereof with one or the other of the said conducting elements depending upon the direction in which it is desired the motor to rotate, means under control of the load motor for turning the other member of the pair in a direction to cause alignment oi contact element and gap to stop the motor, a rotary speed governor driven by the said motor, contacts on the governor connected to the said motor circuit, a pair of switch arms mounted on the governor and spring urged, into engagement with the said contacts, the said pair of switch arms being distally weighted, the said spring-urged arms and distal weights being arranged to cause one of the said pair of switch arms to disengage its said contact at a predetermined normal running speed and to cause the other switch arm to disengage its contact at a reduced speed, and means associated with the said pair oi movable members operative when the members of the said pair are close to alignment of contact element and gap ior rendering the normal-speed governor arrr effective for control of lthe motor speed during the normal running of the motor and placing the motor under control the reduced-speed v`overnor arm as the load approaches the desired end point.

8. In a remote control system -for placing a load at any desired end point, in combination, a reversible motor for moving the load, a pair of relatively movable members, one of the members being selectively adjusted to either side of a neutral position to rotate the motor in the desired direction, means under control of the motor for moving the other member in a direction to overtake the said selectively adjusted member at the said neutral position to stop the motor, a speed governor driven by the said motor having a normal-speed and a reduced-speed switch arm, and control means associated with said pair of members and under control thereof for rendering the normal-speed governor arm eiiective for control of the motor speed during normal running of the motor and for placing the motor under control of the reduced-speed governor arm when the members of said pair are close to the said neutral position whereby the motor speed will be reduced as the load approaches the desired end point.

MICHEL N. YARDENY.

REFERENCES CITED The following references are of record in the nie of this patent:

UNITED STATES PATENTS Number Name Date '714, 862 Buck Dec. 2, 1902 2, 124, 684 Behr et al July 26, 1938 2, 339, 289 Oiken Jan. 18, 1944

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