US931384A - Motor-controller. - Google Patents

Description

H. W. CHENEY.

MOTOR CONTROLLER.

APPLICATION FILED FEILZQ, 1908.

931,384. Patented Aug. 17, 1909.

HIIIIHIIII It] llllllllllllillllm 14 I A l 'stop. The striking of thc'soring-prcssed UNITED STATES PATENT OFFICE.

CORPORATION OF NEW JERSEY.

HERBERT W. CHENEY, 0F NORWOOD, OHIO, ASSIGNOR TO'ALLIS-CHALMERS COMPANY, A

Specification of Letters Patent;

MOTOR-CONTROLLER.

Patented Aug. 17, 1909.

Application am February 29, 1908.1 Serial No. 413,445.

To all whom it may concern:

' Be it known that I, Hennnn'r W. Gunner, citi'x'cn of the United States, residing at Nor wood, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Motor-Controllers, of which the following is a full, clear, and exactspccification;

My invention relates to controllers for electric motors and particularly to foolproof potential starters'for induction motors.

-,In my Patent No. 8%,446, granted August 27"., 1907,.there is describeda potential starter for/induction motors in which arotatable drum cooperates with fixed contact fingers and is, normally movable always in the same direction, means being provided whereby backward movement ofthe controller drum from olf'or running position is reve'nted and whereby the controller will e moved backward to off osition if it is released in any starting position. 'With this controller it is impossible for an operator, how careless or inexperienced soever, to leave the controller in a starting position indefinitely instead of moving it to running position as soon as the motor has gained sufficient speed, and thusthe autotransformer windings which are in circuit only when the control or is instarting position and which-.are proportioned not to carry current continuously but only for the brief perioduring starting,r arereserved from ong' c ntinned currents. at in the device as originally constructed, the means tending to more the com-roller hackward to off position when in starting position comprised a sprin' 5 pressed arm which engaged a part moral) ewith the controller dnum from the time tho/latter left off position until it reached stiirtin position, during this time tending to pal the con troller drum backward to olf position andnnti'l the arm itself struck a stop. When the controller reached the running position the arm was disengaged frhm' the part with which it was previously iniengagen'lcnt and was moved back by a spring against said ar'm. against the stop produced a considerable jwr.

'l tiis the object of my present invention to avoid this jar or shock, andthis object I have obtained by doing away with the stop four the sawingarmed arm. Specifically, the spifing, which is a tension spring, is allowed to not until it is in line with the pivotal point of the arm.

The various'finovel features of my invention will appear hereinafter and. will he particularly pointed out in the claims.

Figure 1 is a front elevation ofthe controller operating mechanism constructed in accordance with my invention, the parts being in. oil position and partly broken away; Fig. is a somewhat similar view, showing the parts just before they reach the running wsition; Fig. 3 is a side elevation. of the operatingmechanisln showing part of the controller, the controller casing and some of the other parts being in section; and Fig. 4 is a partial section through the operating handle.

Within the controller casing 10 is a controller drum A of any desired construction. The operating mechanism here shown is Iespeciall designed for controller drums having uplicate halves, which respectively cooperate with two diametrically opposite sets of contact fingers-during one complete operation of the contro ler and with the op-- posite setsduring the next complete 0 craition th'f'e'df. Such a controller has, uplicute oil, starting, and running positions. The controller here shown passes through but one-starting position between oil" and running positions, though any desired number of starting positions may be uscdl. In the arrangement shown analogous positions are 180 apart. The particular construction and arrangement of thc controlling drum, however, orms no part of my present invention and is applicable to controllers having one off and one running position with any desired number of starting posi tions between them.

' The controlling drum A is driven from an operating shaft 11 in any desired manner, as through gears 12. The shaft 11 isjouinaled in a hearing 13, here shown as integral with the upper part of the frainc l0. Mounted on th outer end of the shaft 11 is the operating handle 14, which is secured at its center to the shaft and )rovided with two hand gri s 15 and 16. s here shown the handle is aorizontalwhen the controller is in oil position. Integral with the frame 10 and surrounding the shaft 11 and bearing 13 is a notched ring 19, the notches of which are adapted to be engaged hy'a sliding pawl or plunger 23 pressed radially into engagement the sprin to the 0 therewith by a spring 24. The plunger 23 is mounted on an extension 25 from the handle 14, which also carries pointers to in- (.llttltfl the positions of the controller. In the ring 19 there is one pair of notches 20 and 20' which extend from the olf to the starting positions, and another pair of notches 22 and 22*which mark the running position of the controller. The ring 19 is so constructed that ratchet teeth are formed between the various notches to revent backward movement of the control er.

Loosely mounted on the shaft 11 is an arm 27, on the outer end of which a second arm 28'is pivoted and pressed inward against the stop 29 by means of the spring 80. The arm 28 carries at its free end a roller 31, which when the arm 28 is pulled inward is in the path of two lugs 32 and 32 carried by the upper gear 12 but which can be pressed outward by a cam 33 on the casting 10 so that it will clear the'lu 32 and 32. An adjustable tension spring 5 is attached to a-boss 36 on the arm 27 and tends to return said arm to the 011' position, the spring being in line with the pivotal point of the arm when the latter is in such off position. The fixed end of the spring 35.is attached by the adjusting screw 35 to a bracket 38 extending downward irom the casting 10 and also forming a bearing for the drt'lm A. When the controller is in off position 0 the parts are as shown in Fig.1, By mov ing the handle 14 in a clockwise direction the controller drum A ma starting position S, when t e pawl 23 will strike the clockwise end of the notch 20' or 20 so that the operator may feel when this startin position is reached. In this movement tie lug 32, through the roller 31 and arms 28 and 27, has extended the s rin 35 to some extent. -If the operators 0111 now release the handle, the spring '25 will contract and pull the drum back to 05 osition, thus preventing the controller rom being left without care in the starting posi-. tion. But if the operator does not re ease the handle when the co t-roller is in starting position, but after'a sufiicient time moves the controller farther in a' clockwise direction it will pass through the position shown in I ig, 2 into the running position R. The position indicated in Fig, 2 shows the parts ustbefore the running position is reached. [f the controller is released at any-point until the position shown in Fig. 2 is reached, 35 will move the controller back position. As the controller a proaches the running position, however, t 1e roller 31 strikes the ram 33. and is moved outward as shown in Fig. 2 until it clears the lug 32, whereupon the s ring 35 will pull the arms.27 and 28 and rol er 31 back to the position shown in Fig, 1-. These parts are actually moved further counter-clockwise be moved .to'

than shown, but will return and pass repeatedly through the position shown in a line of the spring 35 intersecting the axis of the shaft 11.

The pawl 23 and notch 21 or 21* prevent backward or counter-clockwise movement of the drum from the running position. When it is desired to stop the motor the controller is moved farther in a clockwise direction to oil position, when the plunger 23 dro )S into one of the notches 20 or 20 and bachward movement is'again prevented.- 'From this oil position the? operation above. do scribed may be re eated, thou hin this. operation the controller drum 1111f its operating parts are in diametrically opposite positions from. those of the previous operation.

Many modifications in the precise arrangement shown and described may be made without departing from the sgirit and scope of my invention and all such aim to cover in the following claims.

What I claim as new is 1. A starting controller for electric n10- tors, comprising fixed and movable membars, a spring-pressed arm, means for carrying said arm out of its normal position as the movable member is moved from oil' position, and means for releasing said arm from said movable member when the latter approaches running position, said springressed arm being constructed and arranged to returnto andsteg at its normal position by the action of its spring.

2. In astarting control er for-electric motors, the combination of a rotatable drum having 011', starting, and runnin positions; an arm which is spring-presse toward a normal position when on either side of such position, and means whereby on movement of said drum between 011' and running positions said arm is moved out of its normal position and tends to return said drum to oil position.

3., A controller for electric motors, comprising a rotatable drum having ofi', start mg, and running positions, a spring which tends to move the controller back to oil pomeans for releasing said drum from the spring when the running position is reached, said spring bein arrangrd to return to and stop at its norma position by its own action. 4. In a controller for electric motors, the combination of a rotatable drum having oil, starting, and running positions, and a spring-pressed arm through which the con troller is biased to oif position when n startirig position but is unbiased when in run ning position, said sprin -pressed arm being arranged when relea to return to an stop at its normal position by the action of its spring.

gradua ly decreasing arc until they come to rest in the position shown with the center sition when it is in a starting position, and i 5. In a controller for electric motors, the combination of a rotatable drum having ofi', starting, and running positions, an arm, means for carrying said arm out of its normal position by movement of said drum between ofl' and running positions, means for releasing said arm from said drum when the latter reaches running position, and a spring which tends to retnrn said arm to its norma position whenever it is in some other position and also acts as a buffer when the arm is returned to its normal position after having been released from said drum.

6. In a starting controller for electric motors, the combination of fixed and movable members, an arm, a helical sprin attached to the arm, said arm and spring ing normally in a position with the axis of the spring in line with the pivotal point of the arm, and means whereby said arm is forced out of said normal position as said movable member is moved from ofl position but is released to return to such normal position as said movable member approaches running position.

7 In a starting controller for electric motors, the combination of a rotatable drum, an arm acted on by a tension sprin and normally in position with the axis 0 the tension spring intersectingthe axis about which the arm turns, means whereby said drum as it is moved forward from off osition dis places said arm and is thereby iased backward to off position, and means whereby said arm is disen aged from said drum when the latter reac ies a predetermined position.

In testimony whereof I afiix my signature, in the presence of two witnesses.

HERBERT W. CHENEY.

Witnesses Gno, B. Sonmr, FRED J. KINsEY.

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