US2298521A - Remote positioning means - Google Patents

Description

Oct. 13, 1942.

F. F. UEHLING 2,298,521 REMOTE POSITIONING MEANS Filed March 3, 1942 NV NTO I 25 t- 01;

Patented Oct. 13, 1942 h I r "2,298,521

umreo STATES PATENT orrica 7 REMOTE MEANS Fritz Frederick Uehling, Pascale, N. 1.

Application March 3, 1942, Serial No. 433,209 11 Claims. (Cl. 17229) This invention relates to improvements in rethe periphery oi a copper disc i i and is electrimcte positioning means, one object of the invencaliy connected therewith. The axis of the disc tion being to energize a motor of any conven- II, the purpose 01' which will be presently detional type to function in one direction or the scribed, coincides with that of the motor shaft other as required to change the position of any 5 H, said disc being independently pivoted at I! ance with changes in the position of another in either direction except as limited by the fixed element at some local point. Another object 0! contact pieces 8 and I, Figure l. The circuit the motor at a velocity in' proportion to the dis- 10 said counter-clockwise direction starts at battery move in order to assume a position corresponding 3 of the motor and wire ii to the fixedconing to that of the local element, thus reducing tact piece 9 which, when engaged by the contact the speed of the motor gradually while the remember HI, closes the circuit through the disc mote element is approaching said corresponding and a flexible connection I! back to the battery.

oi overstepping is eliminated thereby preventing to the fixed contact piece! which,when engaged by driving torque regardless of the speed at which whichis carried by the disc II is midway between from the position of the local element. and 22 both of which are in a fixed position and Figure 1 illustrates diagrammatically all of the when energized react respectively with armatures elements 01' the invention with their electrical and 24 The armatures 2i and 24 are fasdisc 111-8 counter-clockwise direction, and when A reversible motor I, Figure 2, consisting of an the magnet 22 is energized its reaction with its armature 2 and two field windings 3 and 4, as armature 24 will tend to move the disc in a illustrated diagrammatically in Figure 1, is in clockwise direction. "The magnets 21 and 22 are geared connection with the brush 1 of a potenso designed that when the same amount of ourtiometer 5-4 as illustrated in Figure 2. The rent flows through each or them, the resulting motor is electrically connected through fixed contendencies to move the disc in opposite directions tact pieces 8 and 0, and a movable contact memwill be equal thus causing the contact member ber ll, Figure 1, so that, when contact is estab- II to. assume its normal poation in which posilished' between the fixed contact piece I and the 1 tionas previously stated said member is midway movable contact member ill, it will be energized between the fixed contact members I and a and to rotate the motor shaft I I in acounter-clockmake electrical contact with neither of them.

wise direction and, through the gear-train A second potentiometer consisting oi the brush 1 in a clockwise direction. Similarly,- when connected with the electrcmagnets 2i and 22 and tact is established between 0 and II, the motor wi h the potentiometer l-4 l through b g. will be energized to rotate said shalt in a-clockle 3' and wires 2!, 3|, 1-! and 32, so that when wise direction and to simultaneously move the the brushes 1 and II are in their midway posibrush I in 'a counter-clockwise direction The icna as-iliustrated, the amount of current flow flxed contact pieces 8 and 8 are electrically insuing hrough the magnet 2| will be the same as lated while the contact memberll is i'astened to at fl ng h cugh the magnet 22 thus main 7 function.

2 l V anteater 5 and 25'wiil equal the sum of the resistances 6 5 and 21, thus equalizing the amount of current which flows through the magnets 2| and 22., Under this condition the reaction between the ni'agnet 2| and its armature 23 tends to rotate the disc in a counter-clockwise direction with a 1 force equal to the reaction between the magnet 22 and its armature 24 which tends to rotate the disc in a clockwise direction, thus causing V the contact member It to assume its normal position in which position of said member, neither of the motor circuits previously traced will be closed and the motor will remain idle.

It follows from the above that a change in the position of the brush 25 in a counter-clockwise direction to any new position such as 25a,

will increase the resistance 26 and decrease the resistance 21 thus increasing the amount of current flowing through the magnet 2| and decreasing the amount of current flowing through the magnet 22 thereby increasing the force of 25 reaction between the magnet 2| and itsannature 23, anddecreasing the force of reaction between the magnet 22 and its armature 24. The dominating force ofv the magnet 2| will thus cause the disc II to move in a counter-clockwise direction to engage the contacts 9 and ill. The engagement of the contacts 9 and I0 closes the circuit which energizes the motor to rotate the motor shaft M in a clockwise direction and simultaneously, through the gear 5 train 33-34-3546, to move the brush 1m 8. counter-clockwise direction. The motion of the brush 1 in this direction will obviously increase the resistance 6 and decrease the resistance 5 equals the sum of the resistances 5 and 26 at which time the amount of current flowing through the magnet 2| will again be the same as that flowing through the magnet 22, the contact III will again have assumed its normal positlon as illustrated and the motor will cease to Similarly a change in the position of position 2512 will increase the resistance 21 and decrease the resistance 26 thus increasing the armature 24 and decreasing the force of reaccause the disc H to move in a clockwise direction to engage the contacts 8 and closing the circuit which energizes the motor to rotate the motor shaft M in a counter-clockwise direction and simultaneously to move the brush The motion of the brush 1 in this direction will increase the resistance 5 and decrease the resistance 8 untiles tude under which condition the contact member It will againhave assumed its normal position as illustrated and the motor will again cease to It follows from the above that when the brush 25 is moved to anynew position, the motor 75. her II to engage the con will be energized to function'in the proper direction to move the brush 1 to a corresponding position in which position as previously described the contact'member is will assume its normal position as illustrated to deenergize the motor. It is obvious however, from the foregoing description that so long as the magnets are unbalanced, so long will contact be established between-contact member It and one or s the other of the fixed contact pieces 8 and 9 thus causing the motor to function at-full speed until the brush 1 has reached its balanced position in which "tion the current flowing through the two magnets 2| and 22 will be thesame and the motor deenergized. The inertia of the motor will however cause the brush 1 to move beyond its balanced position thus, in the manner previo ly described, causing the contact member I! to move beyond its normal position to engage the other fixed contact piece thereby reversing the motor with a speed suflicient to create. an inertia that will move the brush 1 beyond its balanced position direction thus causing the contact member Hi to move in the opposite direction sufliciently to again engage the fixed contact member 8. The inertia of the motor will thus cause a hunting action which for any fixed position of the brush 25 will cause the brush 1 to move back and forth through an angle depending upon the inertia involved. This action is obviously very objection-- of the disc H by means of a hub 20. This ma net, which is rotated by the motor' in one direction or the other depending upon which of the motor circuits is closed by thecontact member it, in combination with said disc and the contacts 8 9 and I0 provides, as will be seen, the means for eliminating the aforesaid hunting action and therefore constitutes a very important part of this invention.

It is obvious that when the magnet H is rotated by the motor in either direction, eddy currents will be induced in the disc Ii which will react with the magnet to create a force or drag which tends to move the disc in the same direc- 1 tion; furthermore this force is a function of the decreases as the speed of the motor decreases until, when the magnet is at rest, said force will be zero. It follows therefore that when the brushes 1 and 25 are in any balanced position. as for example the midway positions illustrated, the balanced forces of the electromagnets 2| and 22 will maintain the contact member Ill-in its normal position as illustrated, the motor will be deene this condition is at rest will have noinfluence whatsoever on the dis on the other hand if the brush 25 is moved in a counter-clockwise direction to some new position 250, the force of the reaction between the magnet 2i and the armature 23 will be decreased while the force of reaction between the magnet 22 and the armature 24 will be increased thus, in the manner previously described, causing the. contact mem- 1; piece .8, energizing 2i and 22 in the opposite rgized and the magnet is which under.

' net 22 with its armature magnets 2| and 22 If during the period of time in vegch the magnet I9 has gained suflicient speed to break electrical contact between l and 8, the brush 1 has been moved sufficiently by the motor in a clockwise direction to balance the electromagnets 2| and 22, then the contact member ID will remain in its tact has been broken between I and ID by the drag on the disc, the motor will merely slow down until the drag on the disc in a counterclockwise direction as magnet H has decreased to a point where the resultant force of the two electromagnets 2| and 22 again dominates sufficiently in a clockwise direction to reestablish contact between 8 and ID. This action will obviously repeat itself until the reaction of the electromagnet 2| with its armature 23 balances the reaction of the electromag- 24 at which time the contact member ID will remain in its normal position as illustrated and the brush 1 will have assumed a new position corresponding to whatever new position'lnto which the brush 25 might have been moved. In this connection it should be pointed. out that for every revolution of the magnet IS the brush 1 is moved a proportionate proper direction to balance the are balanced the resultant force of the two magnets 2| and 22 which establishes contact, not only becomes smaller and smaller but the required speed of the magnet oi suflicient magnitude to becomes less and less so that as the brush 1 approaches a new position corresponding to any new position of the brush 2!, the motor will continue to slow down until the brush 1 has reached its final position in which the contact member to rotate the permanent magnet I! with respect to the disc II to electromagnets 2| and 22 are very much out of retarding the speed 01' the brush as it approaches at the same time.

Although the motor illustrated and described is a series wound motor with I claim: 1. In a device of the class described, the combination with 3. In a device o1 the class described, the comreversible electric motor, and for controlling its direction of balance and gradually to control the and two fined contacts for alternative engagemerit therewith; of a copper disc rotatahle about c eeses a. In a device of the class described, the combination with a motor and a metallic element rotatable thereby, of a circuit for energizing the motor to function in one direction, a second circuit for energizing the motor to function in the opposite direction, a contact arm fastened to the rotatable metallic element a fired contact piece in the path of the contact arm which limits the rotation of the element in one direction and which when engaged by the contact arm closes the first circuit, a second fixed contact piece in the path of the contact arm which limits the rctation of the element in'the opposite direction and which when engaged by t e contact arm closes the second circuit, a, movable magnet driven by the motor for creating a magnetic drag ontheelenient which when the motor functions in said one direction tends to move the contact arm away from the first contact piece and when the motor functions in the opposite direction tends to move the contact arm away irons the second contact piece, means for applying a force to "the element which tends to establish contact between the contact arm and the first contact piece,'means for applying a second force to the element which tends to establish contact between the contact arm and the second piece, means actuated by the motor for changing the ratio of the magnitude of said forces, and means for changing said ratio independently oi said motor actuated ratio changing means.

5. In a device or the class described, the combination with a rotatable disc, of a contact memher fastened to the periphery of the disc, at fixed contact piece in the path of the contact member for limiting its motion in clockwise direction and which when engaged by the contact member establishes electric contact therewith, a second fixed contact piece in the path or the contact member for limiting its motion in a counterclockwise direction and which when engaged by the contact member establishes electric contact therewith, a rotatable magnet located in proximity of the disc for creating an eddy current drag on the disc when the magnet is rotating, a motor,

for rotating the magnet, a circuit which is closed by contact between the contact member and the first fixed contact piece for energizing the motor to rotate the magnet in the proper direction to create a drag on the disc which tends to move the contact member contact piece, a second circuit which is closed by contact between-the contact member and the second fixed contact piece to rotate the magnet in the proper direction to create a drag on the disc which tends to move the contactmember away from the second fixed contact piece, an armature fastened to the disc, an

the proper direction to establish contact between the contact member and the second fixed contact electrical energy, a resistance, the electromagnet and a second resistance, a second armature las tened to the disc, a second electromagnet with which the second armature reacts in the proper direction to establish contact between the contact member andthe first fixed contact, a fourth circuitwhich includes the source of energy, a third resistance, the second electromagnet and a fourth resistance, means actuated by the motor for changing the relative magnitudes of the first and third resistances, and independent means for changing the relative magnitudes of the second and fourth resistances.

6. In a deviw oi'the class described, the combination with a movable contact member, of a fixed contact member capable of being engaged by the movable contact member to close an electrio circuit, a second fixed contact member capable of being engaged by the movable contact member to close a second electric circuit, an electromagnt which when energized tends to move the movable contact memberinto engagement with the first contact member, a second electromagnet which when energized tends to move the movable contact member into engagement with the second fixed contact membe means for energizing said electromagnets, a variable resistance for controlling the energy input to the first electromagnet, a second variable resistance for controlling the energy input to the second electromagnet, an electrical meansrin the first circuit for simultaneously increasing the first resistance and decreasing the-second resistance, a second electrical means in the second teneousiy decreasing the first resistance and increasing the second resistance, means actuated by the first electrical means for creating current drag which tends to move an eddy the movable contact element away from the first fixed contact element, means actuated by the second electrical means for creating an eddy current drag which tends to move the'movable contact element away from the second fined contact element, and independent means for changing the ratio of said variable resistances.

7. The combination with a motor, of a circuit 7 for energizing the motor to rotate in one direction, a second circuit for energizing the motor to rotate in the opposite direction, a movable contact member, means actuated by the motor for creating a drag which tends to movethe movable contact member in thedirection of rotation. of the motor, a fixed contact which said movable contact member, when moved in said one direction, is capable of engaging to close the second circuit, electrical means for moving the movable away from the first fixed for energizing the motor electromagnet with which the armature reacts in contact member into engagement with this fixed contact member in opposition to the drag in said opposite direction, a second fixed contact which said movable contact member, when moved in said opposite direction, is capable of engaging to close the first circuit," and electrical means for moving the movable contact member into encasement with the second fixed contact in opposition to the drag in said one direction. a

8. The means set forth in claim 7, with additional means .for simultaneously electrically energiaing both of said electrical means, independent means -for changing the ratio of the electrical input to one of said electrical means with respect tothat of the other, and means actuated by the motor for changing said ratio.

9. In a device of the hination with a reversible motor, of a circuit for energizing the motor to rotate-in one direction,

circuit for simule class described, the commeans actuated by the motor for a second circuit for energizing the motor to rotate in the opposite direction, an electromagnet which when energized tends to close the first circuit and open the second circuit, a second electromagnet which when energized opposes the first electromagnet and tends to close the second circuit and open the first circuit, means for energizing both electromagnets simultaneously, creating a drag in one direction or the other depending upon the direction of rotation of the motor, means for applying the drag in said one direction to oppose the action of the first electromagnet and tending to open the first circuit, means for applying the drag in said other direction to oppose the action of the second electromagnet and tending to open the second circuit, means actuated by the motor for changing the ratio of energy input of the first electromagnet with respect to that of the second, and independent means for changing said ratio.

10. In a device of the class described, the combination with a reversible motor, of a circuit for energizing the motor to rotate in one. direction,

a second circuit for energizing the motor to rotate in the opposite direction, means actuated by the motor for creating an eddy current drag in the direction of its rotation, electrical means which tends to close the first circuit, means actuated by the drag in said one direction which tends to open the first circuit, a second electrical means which tends to close the second circuit, means actuated by the drag in said opposite direction which tends to open the second circuit, a third circuit which includes the first electrical means, a fourth circuit which includes the secergy in both of said third and fourth circuits, a circuit, a second 1 contact member.

variable resistance in the fourth circuit, means actuated by the motor for simultaneously changing both of said resistances, and independent means for simultaneously changing said resistances.

- 11. In a device of bination with a movable contact member, of a fixed contact member for limiting the motion of the movable contact member in one direction, a second fixed contact member for limiting the motion of the movable contact member in the opposite direction, means for applying a force to the movable contact member in said one direction to cause its engagement with the first fixed contact member, means for applying a force to the movable contact member in said opposite direction to cause its engagement with the second fixed contact member, means for changing the ratio of the magnitude of the first force with respect to that of the second force, means for creating a magnetic drag, means for applying the drag to the movable contact member, an electric circuit which is closed by engagement of the movable contact member with the first fixed contact member, electrical means in said circuit for actuating said ratio changing means in one direction and simultaneously actuating said drag creating means to move the movable contact member away from the first fixed contact member, a second electric circuit which is closed by engagement of the movable contact member with'the second fixed contact member, and a second electrical means in the second circuit for actuating said ratio changing means in the opposite direction and simultaneously actuating said drag creating means to move the movable contact member away from the second fixed F. FREDERICK UEHLING- the class described, the com-

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