US1489493A - Motor-reverse control - Google Patents

Description

April 8, 1924.

' E. F. GWYNN ET AL MOTOR REVERSE CONTROL Filed Maly 12 1921 2 Sheets-Sheet l i v@-27 l April s, 1924, 1,489,493 K E. F. GwYNN ET AL MOTOR REVERSE CONTROL' Filed May 12,i 1921 2 sheets-snee; z

Patented Apr. 8, 1924.

UNITED STATES PATENT OFFICE.

EMMER F. GWYNN AND HAR-RY H. JAMES, OF PITTSBURGH, PENNSYLVANIA.

MOTOR-REVERSE CONTROL.

Application led May 12, 1921.

Serial No. 468,988, we have illustrated and described a motor reverse control in which magnets were interposed in the motor circuit between the reversing switches and the motor, the arrangement being such that when the motor is running in either direction one of said magnets will be withdrawn from its contact, and as long as the motor is running in this direction contact will be broken so that in case the lever is suddenly thrown to reverse the magnet will not be released to engage its contact until the motor comes to rest, thereby preventing the blowing out of fuses, stoppage of the elevator at points between the floors, burning out of the motor armature, etc., all of which cause aggravating delays and expensive repairs.

The object of our present invention is to effect the same result, but instead of operating the device entirely electrically, as in the application above referred to, the operation is done electro-mechanically.

In the accompanying drawings Fig. 1 is a plan view of our improved reverse control, the illustration being largely diagrammatic; Fig. 2 is a View of one of the reversing switches; and Figs. 3 and 4 show modied forms of our invention.

In the drawing the numeral 2 designates an ordinary control-box provided with the lever 3 and the ordinary segmental contact 4.

The control-box 2 has the ordinary contacts 5 and 6. The wire 7 leads from the contact 5 to the electro-magnet 8 with the longitudinally movable core-bar 9 which also enters the magnet 10. On the core-bar 9 is the collar or stop 11. Springs 9a are provided to return the core-bar to normal position.

Projecting out from the core-bar 9 are the brackets 12 and 13 having contacts 13 and 14a which normally engage the pins 14 and 15, respectively, said pins having the Serial No. 468,989.

heads 16 which lit within the small c 1inders 17, and springs 18 are interpose between the ends of said cylinders and the heads-of said pins acting to normally force said pins outwardly.

T he electro-magnet 19 has the core 20, the outer end of said core engaging the lever 21 which is pivoted at 22 on the arm 23 on said electrodnagnet 19. A. spring 24 surrounds the core 20 and acts normally to hold the lever 21 in the full line position shown in F ig. 1. The electro-magnet 19 is connected up to the circuit of the motor 25.

Suitable reversing switches 26 and 27 are provided, the construction of said switches being more specifically illustrated in F ig. 2.

It has not been deemed necessary to refer to the circuit in detail, as that is a matter which is well understood by those skilled in the art, and is the ordinary circuit employed in the operation of electric elevators, although it will be clearly understood that we do not limit our invention in any way to this application of our invention.

The operation is as follows:

Energizing magnet 27 a pulls down reversing switch for forming a circuit for the motor in which current flow from the inain line will be through fuse 30, lead 31, contact 27a of the reversing switch (not shown) through the switch'to lead 32, contact 33, lead 34, contact 35, and then to the reversing switch for forming a circuit to drive the motor in the vopposite direction of rotation (said switch not shown), through said switch to contact 36, lead 37, solenoid 19 and lead 38 to the motor 25, thence by lead 39 to contact 40 through said first mentioned reversing switch to contact 41, lead 42,' contact 43, said last mentioned reversing switch, contact 44, lead 45 and to the motor resistance 46, then back to opposite side of the line by lead 47.

Reversing the control handle 3 energizes magnet 27h, pulling down reversing switch for completing a circuit to drive the motor in the opposite direction. Current iiow from the main line A will then be through fuse 30', lead 48, contact 48, reversing switch, lead 49, contact 35, lead 34, contact 33, to said first mentioned reversing switch to contact 50, lead 51, to contact 43, lead 42 to the switch operated by magnet 27a to contact 53, lead 39 to the motor 25, thence by lead 38, solenoid 19 and leads 37 and 37n o contact 54, said iirst switch and contact i, to lead t5 and to motor resistance 4G, then back Vto line by lead el?.

rEhe motor tlien proceeds in the reverse direction, but only atter it has been permitted to come to rest, and the annoyance and inconvenience due to blowing ont ot tuses, stoppage of the el ve-or at points between the floors, buriiing out ot the motor armature, etc., are all practically obviated.

ln Figs. 3 and el we have illustrated a modified torni oit our invention in which the electro-magnets 2S and 29 are. inteipi'ised between the reversing switches Q6 and and control-box. The cores 30 and 3l oi the electro-magnets QS and are connected to the lever 82 which is pivoted at 33 to the bracketr The lever 3Q has the projecting arin 35 carrying the c it cts 3G and 37 which are adapted` to engi. iiie pins and 39 adapted to move bach and forth in the cylinders Ll0, the springs it-l being provided for normally advancing said pins into en gageinent with the contacts 3G and 3T when the operating lever is at neutral position.

rllhe vertically movable rod is connected to the arni said rod having a telescopic connection with the shaft The vertical shaft 43 has the governor mounted thereon consisting ot the braclret el with the arms #to pivotally connected thereto and carrying at the lower ends the weights 4G. The ripper ends of the arms 45 are turned inwardly` as at el?.

The rod is provided with the collar or abutment 41S. lie sha'tt i3 may be driven in any suitable manner from the iiiotor di rectly or indirectly the shaft t9 being connected by means of the bevel gears and 51.

The operation is as tollows:

`When the operating lever is at neutral position the parts will have the positions indicated in Q. but. it the operator throws the lever so as to bring the segmental Contact into engagement with the contact point 5 the electioinagni-rt Q8 will be energized and the core 8O drawn inwardly. the parts assuming the positions indicated in li iff. 3 wl ere the lever 32 is moved so that die z in li drziws the contact il? ii 'n Pif) while the contact 36 is moved upwardly. compressing the spring il-l. The movement ot the oilierating lever through the reversi switch 2G will start the motor and wi*E the operation of the motor the governor pnt in operation.r and the centrifugal action orn the ariiis 45 will thror.' the, inwardly projecting ends t7 inwardly so as to be below the stop or aliiutnient 4S on the rod di@ which has been raised by the movement ot the lever 32. As long as the motor continues to run the rod t2 will be `prevented from moving downwardly and the separation between the contact 37 and the pin 39 will be ii'iaintained so that in case the perator should suddenly throw the lever into reverse by bringing the segiiieiital contact #l into engagement vfitli the contact point 6, such n'ioveineiit will have no ell'ectl to revci e the izio'oi'l. tor as lo y as the 'i' wardly projecting ends et-T ot the arms 45 ot the governor are below the abutment t8 'the contact 37 cannot niove. into engagciiieiit with the pin Tillien, however, the inotor ,finally conn 1"' vernor will assume the posi ion indicate in lull lines, Fig. and this will permit the rod 42 to descenth to permit the contact Si" to engage the pin Si): and the inward movement ot the core of' the electro-inagi'iet will torce the pin downwardly and will brealr the contact between the contact Il@ and the pin 38. ln this manner the reversal ot the motor will be etlected and without the dillicnlties above enumerated.

That we claim is:

l. In a motor reverse control, the combination with the control-box and lever, of rcversing switches. magnets interposed between said switches and the control-box, a longitudinally movable rod operated by said magnets, contacts connected to said rod for opening and closing the circuit to said switches, and means operated by the motor .For preventing the return ii'ioveinent ot said rod iintil the motor coines to rest.

2. In a motor reverse control, the combination with the ci ntrol-boX and lever, of rcversing switches. ni:V interposed between said switches and the control-boit, a longitudinal y movable rod operated by said magnets, contacts connected to said rod for opening and closing the circuit to said switches, an abutment on said rod, and means operated by the motor moving into the path of said abutment tor preventing the return movement ot said rod until the inotor comes to rest.

8. En a motor reverse control, the coinbination with a control-box and leven of re ve jing switches magnets interposed between said switches and the control-box. a longitudinally movable rod operated by said magnets, contacts connected to said rod for opening and closing the circuit to said switches. an al'iutment on said rod. and a member movable into the path oit said abutnent operated by said motor and automatically vitlidrawable when said motor is at rest.

it. In a inotoi reverse control, the combination with the control-boi: and lever, ot reversing switches, magnets interposed lietween said switches and the control-box, a longitudinally inovablc rod operated by said magnets, contacts connected to said rod for opening and closing the circuit to said switches, an abutment on said rod, and a governor comprising pivotally mounted weighted arms, and connections between the motor and said governor :for rotating same.

5. In a motor reverse control, the combination with the control-box and lever, of reversing switches, magnets interposed between said switches and the control-box, a longitudinally movable rod operated by said magnets, contacts connected to said rod for opening and closing the circuit of said switches, an abutment on said rod, a governor comprising pivotally mounted weighted arms having inwardly extending end portions, and connections between said motor and said governor for rotating same.

-In testimony whereof we, the said EMMER 15 F. GWYNN and HARRY H. JAMES, have hereunto set our hands.

EMMER F. GWYN N. HARRY H. JAMES. Witnesses:

RoBT. D. ToT'rEN, JOHN F. WILL

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