US1041859A - Motor-controlling device. - Google Patents

Description

T. w. NOWELL. MOTOR CONTROLLING DEVICE. APPLICATION FILED MAY 19, 1911.

Patented Oct. 22, 1912.

2 SHEETSSHBET 1 /17 we, to r" Thomas W/Vowe/A QZW /-//s Attorney W/tnesses:

' T. W. NOWBLL.

MOTOR CONTROLLING DEVICE.

APPLIQATION IILEDYMAY 19, 1911.

1,041,859. Patented Oct.22,1912.

2 SHEETSSHEET 2 v l V/tnesses: /27 van to)" 1 Thomas W/Vowe/L q (I 6 W14 His Attorney UNITED STATES PATENT OFFICE.

THOMAS W. NOWELL, OF SOHENECTADY, NEW YORK, ASSIGNOII. TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

MOTOR-CONTROLLING DEVICE.

To all whom it may concern: Be it known that I, THOMAS \V. NowELL,

a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Motor-Controlling of this character in which the speed at which the controlling operation is performed is positively limited in a simple and reliable manner.

One of the objects of my invention is to provide a controlling device with simple and positive means whereby the movement of the controlling member is automatically stopped for an instant at a predetermined point and may then be continued by the operator.

While my invention is applicable to vari- "ous types of controlling devices, it is particularly well adapted for motor controllin devices of a character in which the cone tro lin arm is moved from the initial or ofi position through the starting position to running position. y ment. In the starting of motors with starting devices of this character, especially where the starting is performed in a single step, it is desirable that there be some means for preventing the operator from passing.

too quickly through the starting position so as to establish running connections before the motor has come up to speed.

In carr'yin means where y when the operator reaches the starting position, the controlling. arm is positively stopped and in order that the startingarm may be continued to running position it is necessary to give the controlling arm a'sli'ght movement in a backward direction.

Other objects and purposes of my inven tion will appear in the course of the following specification in which I have shown my invention'em'bodied in concrete form for purposes of illustration.

Referring to the drawings illustratingone form of my invention, Figure l is a plan view of my device, showing the circuit connections; '2 is a side elevation of the same; Fig 3 is a view showing the Speci fi eIt ionof Letters Patent.

Application filed May 19, 1911. Serial No. 628,163.

a unidirectional move- 3 out my invention I provide Patented Oct. 22,1912.

controlling arm in the starting position;

and Fig. 4 shows the starting arm after it has been reversed farg ough to permit the movement of the arm to retirin position.

Referring to the drawing, it will be-seen that I have shown my invention in connection with the starting of a single phase motor by means of what is known as a split phase connection, but it is obvious that my invention is in no sense limited to the particular form of motor or connections for starting the same. fore, 10 represents an insulating base of slate or soapstone having mounted thereon the controlling arm 11 pivoted at 12 and biased or spring pressed to the off position against the stop 13 by means of the spring 14. 'The contact on the controlling arm in the off position is in contact with the insu- In the drawing, there,

ing segment 18. In order to hold the con-,

trolling arm in running position I provide a spring pressed latch 19 pivoted at 20 and spring pressed so that the notch 21 in the end of the lever will engage with a pin 22 on the controlling arm when the latter is in running position. The opposite end of the lever projects outward so as to be engaged by the plunger 23 of the no-voltage magnet when it drops and thereby release the controlling arm and allow it to return to the off position. In this type of starting device it is desirable to prevent the operator from passing through the's'tarting position too quickly. In other words, it is desirable that the operator be required to stop for an 'instant in the starting position so as to give the motor a short interval of time in which to speed up. .One of the principal features of my invention, therefore, is the provision of means for accomplishing this result. To this end I provide in connectionwith the controlling arm a detent member 24: which isadapted to engage the stop 25 when the arm is moved to starting position. This detent is secured to the controlling arm by means of the pin 26 secured to the arm. This pin passes through a slot 27 in the detent so as to act as a pivot for the detent. The ,pin moves easily in-the slot 27 from one yieldingly into contact with the care. The

point 32 at which the springf O is secured to the detent is in such a position that it is on opposite sides of the pivot 26 when the latter is at opposite ends of the slot.

As shown in Fig. 1, the pivot 32 is to the right of the pivot pin, while in the position shown in Fig. 3 the pivotal point 32 is to the left of the pivot pin. In other words, the point 32 is between the lines drawn from the point 31 to the two positions occupied by the pivot pin at opposite ends of the slot. In the position shown in Fig. 1, therefore, the finger of the detent is held against the cam face of the stop while in the position shown in Fig. 3 the spring tends to move the detent finger away from the cam face out the stop. It will be observed, however, that when the finger is against the stop thepoint'of the finger is in the recess 29 so that the finger can not leave the face of the calm until the arm backed the finger out of the recess.

The mode of operation of my device is as follows: with the parts in the position shown in Fig. 1, the controlling arm lever is spring pressed to the ofi position and the detent 2% is pressed against the stop or buffer llift-orcing the detent into the position shown in Fig. 1. In this position. the spring 30 is pulling the detent into engagement with the cam face'of'the stop 25. As the arm is moved to the right to start the motor the contact arm engages the contact 33 which energizes the no voltage magnet so as to move the plunger 23 out of engagement with the LIIH of the latch 19. When the arm is mov ed to the position shown in Fig. 3, the starting connections 'are made. These connections are shown, for purposes of illustration, as being of the split phase type in which the resistance 34 and the reactance 35 are connected in parallel across one of the windings 0'? the motor .These connections gire to the motor a starting torque. It is Iecessary, however, that the arm be held in this position at least for an instant in order that themotor may be started. In this position it will be observed that the finger 28 of the detent enters the recess 29 of the stop and positively prevents any further movement. As the arm moves toward the starting. position the detent' is in the position shown in Fig. 1. "When, however, the starting finger engages the stop, the pivot pin :36 moves forward in the slot 2? until it reaches the position shown in witness Fig. 3. As the pin 32 passes to the opposite side of the pivot, the tension on the detent is reversed so that with the parts in the position shown in 3, the bias or tendency of the spring is to move the finger away "from the cam face of the stop. This movenient,however, is restrained by the fact that the finger 18 in the recess 29. 'lhe operator therefore reaches the starting position in which the resistance and reactance windings are in circuit and steps. In order to get' farther, e he moves the handle back a short distance sufiicient to take the 28. out of the recess 29. As soon as this is? done the spring throws the finger into the position shown in Fig. 4. The operator is F now able to continue the movement to run- 1 ning position, in which the arm. is held by the latch 19. On failure of voltage the plunger 23 of the no-voltage magnet will be released and trip the latch 19, thereby returning the arm to the 05 position. As the" arm strikes the buiier 13 the detent is again shifted on its pivot to the position shown in. Fig. 1. The net resultis that the operator can not possibly pass through the starting position without stopping and reversing slightly, which movement will take a small amount of time suthcient to enable the motor to get started.

While I have described my invention in connection with the controlling of a par ticular type of motor and as operating in a specific manner accordance with the patent statutes, it should be understood that I various modifications thereof will suggest themselves to those skilled in the art without departing from the spirit of my invention, the scope of which is set forth in the annexed claims.

What I claim as new and desire to secure by Letters Patent of the United States, is,-- 1. A controlling device for electric circuits comprising a controhing arm, a co operating stop and dct-ent mechanism associated with said arm biased to lock the arm when the latter is moved to a predetermined position and means whereby the detent is biased away from the stop by the pressure of the detent against the stop and is released therefrom by a backward movement. 2-.' A controlling device for electric pircuits comprising a controlling arm, a' j detent mounted thereon and biased to locin ng position, a recessed stop arranged to receive said detent at a predetermined point in'its travel when the detent is inloclning position, and means whereby the bias on said detent is reversed by the pressure of thedetent in the recess so as to cause the detent to nioveput of the path of the stop when released from the recess.

3. A. controlling device for electric circuits comprising a controlling arm, a reat .do not limit my invention thereto, sincecesseol stop, a detent on said arm having a locking position in which it enters the recess at a predetermined point of its travel and a releasing position in which it is out of the path of the stop, and means whereb the -detent is held in looking position whi e the arm is being moved to said predetermined point and is biased toward releasing position by engagement with the stop so that the detent will move to releasing positionwhen moved out of the recess.

4. A controlling device for electric cir cuits comprising a controlling arm, a recessed stop, a detent mounted on the arm and biasedto enter the recess at a predetermined point in the travel of the arm to stop the same, and means whereby the bias on the detent is reversed by the pressure of the detent against the stop so that the de- 90 tent will move out of the path of the stop when released from the recess.

5. A controlling devicefor electric circuits comprising a controlling arm, a pivot pin on said arm, a detent movable on said pivot to change the pivotal point thereof, a

spring having one end secured to the armand theopposite end secured to the detent at a oint between the pivotal points so that t is spring will act upon opposite sides of the pivot in opposite pivotal positions of the detent, and a stop for engaging the detent in a predetermined position of said arm.

6. A controlling device for, electric circuits comprising a controlling arm, a pivot pin mounted on said arm, a detent movable on said pivot to change the pivotal point thereof, a spring having one end secured to the arm and the opposite end secured to the detent at a point between lines drawn from the securing point on the arm to the opposite pivotal points, a stop for engaging the detent at a predetermined point in the travel of said arm to hold it while the pivot is moved to its opposite pivotal point, and a stop at the initial position of the arm for en-- gaging the detent and moving it to the other pivotal point. i

In witness whereof, I have hereunto set my hand this 17th day of May, 1911.

THOMAS WV. NOWVELL.

Witnesses:

HELEN ORFORD, BENJAMIN B. HU L.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Wilmington, D. C.

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