US1490552A - Recentering device for elevator control - Google Patents

Description

c. J. ANDERsoNl RECENTERING DEVICE FOR ELEVATOR CONTROL 'Filed March 7 1923 EINE n ffl/@22140 .042! c/ @if y l iii Patented Apr. 15, 1924.

PATENT OFFICE.

" CARL J. ANDERSON, or CHICAGO, ILLINOIS..

BECEN'IERING DEVICE Fon ELEVA'IOR CONTROL.

Application tiled March 7, 1923. Serial No. 623,358'.

To all 'whom it may concem:

Be it known that I, CARL J. ANDERSON, a. citizen of the Unitedy States of America, and airesident oi' Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements` in Recentering Devices for Elevator Control, of which the following is a specification.

My invention relates to reoentering devices to be used innelevator control, and has for its object, improvement in such devices. More particularly, my improvement relates tothose elevators which are controlled by a rope or cable which passes thru the yelevator car and runs over asheave, the car being moved by an electric motor. If the current from the source should be interrupted and the motor stopped when the de-.

vices operated by the cable are in a position to start the motor, the operator ymight leave the car without kknowing that fact. The object is to prevent the 'motor from starting in case the current again Hows from the source until after the cable, and arts controlled thereby, havefbeen returne to center position. In this connection it should be remembered thatthere is nothing on or about the cable to indicateto the operator the position of :the parts which startend stop the elevator. f l

In the accompanying drawings- Fig. 1 is an elevation ofso much structure as is necessary to an of the present invention; f L

Fig. 2 is a sectionon line 2 2- of Fig. 1; and .y t

Fig. 3 is adiagram of the circuits. f`

The cab-le which passes thru lthe elevator car is shown in dotted: lines at l11, and one of the sheaves over which kit passes is shown in dotted lines at 10. The sheave .10` is secured to a shaft 12,r and also secured to this shaft is an arm 13.

Near the arm 13 is a frame 14 which carries a magnet 15, having an armature 16 pivoted at 17. Pivoteol` at 18 on the frame 14 is an armv 19 having` a roller 20 in the path of the arm 13 when said armis moved back and forth eachside ofits center posi tion as shown in Fig. 3.' IVhen the arm 13 is in the position shown in Fig. 1, and there is no current fiowing thru the magnet 15, the armature 16 drops by gravity until it is stopped by striking the corner 21 On the post 22 which carries the pivot 17, and the arm 19 drops until stopped by engagement with of if the understandingk they lug 23 on frame 14. In this position the armature is so far from the pole of the magnet 15 that the attractive force of the magnet kwill not be enough yto raise said armature when a current flows thru the ma net.. y

eyond the roller 20, the. arm 19 bends upward, as shown at 24, so as to strike and raise the armature 16 when the end of the arm 13 engages the roller 20 as said arm 13 comesk to its center position. In such raised position, the armature 16 is within the range of the magnet, and will be attracted and held provided a current is flowing thru said magnet at such time. On the end of the arm 19 beyond 24 is a hook 25, and on the `armature 16 is a hook 26. These parts are so arranged that, when the arm 19 pushes the armature upward, the hook 26 comes under the hook 25. If there is a current flowingthru the magnet 15 at the time, then the attraction of the armature will maintain hook 26Aunder hook 25, and the parts will not fall when the arm 13 moves away from its center position.

Supported on a piece of insulation 27 are Contact terminals 28 and 29, and insulatingly supported on arm 19 is a plate 30. yWhen the arm 19 is atits upper position, the` plate 30 completes connection `between the terminals28 and 29, butwhen the arm 19 drops to its lower position, this connection is broken.

Secured to the shaft 12 is a lever 31 having insulated ends 32 and 33 adapted to make electrical connections to certain terminalswhen the leveris moved in either direction from its center position. The relationship ,of thelever 31 vvtothe arm 13 is such that the two are in their center positions at the same time, as shown in Fig. 3. There is a motor M for driving the elevator, and a solenoid 34 for closing electrical connections as will be described. There are electrical connections illustrated in Fig. 3, and which will bel hereinafter described. The magnet 15 is bridged upon the lines 35 and 40 leading to the source of electric current, but otherwise there is no comp-lete electrical connection when the lever 31 is in central position.

It will be assumed that there is a current on lines 35 and 40, and that the parts stand as in Fig. 3. If the operator on the car pulls the cable 11 so as to connect 32 to 48 and 33 to 36 and 41, then a current will flou7 -35-33-36-37-34-38-30-29- 3940- This current thru the solenoid 34 connects an electrical connection for the motor lat 45 and a current flows :#35-33-41-42-31- dt-lldt-LlG--iT-iS-32-l9-4O.

This operates to move the elevator in a direction corresponding to the direction given to the motor by this current. then f the cable is pulled to stop the car, the circuit is broken vfor both the motor and the solenoid lVhen the lever 31 is moved to the other extreme, a current lo\vs:-35L3- 50-37-34-38-30-29--39-40.

This operates the solenoid 3s as before, whereupon a current flows thru the motor but in a direction reverse to that before, follows 35--33-51-16-45-#14-43-hl i2-52-32-l9-40.

Tt is to be not-ed that the solenoid 34 closes the circuit for the motor M, and that the circuit for the solenoid goes thru or includes the contact 29. It the supply of current thru lines 35 and 40 should be cut ofi' at some point outside, then the motor would stop. It' the arm 13 is not at its center position when this occurs, then the armature 16 and arm 1S) ivill fall down and break the con nection at 29. It the current thru lines 35 and 40 should be re-established While the arm 13 was ott center, the motor circuit would not be re-established, even if the arm 13 were far enough oit center to close the connections at 32 and 33. The reason is that the magnet 15 does not close the connection at contact 29, and that connection must be closed before the motor can be started. The magnet is supposed to have power enough to hold the armature when it is in attracted position, but not enough to raise it from retracted position. However, no harm Would come if the magnet did have enough power to raise the armature, because, in that case, the end of the hook 26 Woud strike the corner 5ft on the outer end of arm 19. This would in no Way prevent the arm 13 from raising the arm 19.

From the foregoing description it will be seen that for the motor to operate, the contact 29 must be closed. Also, that this contact is closed by mechanical means, and is held closed by electrical means. Also, that the mechanical means for closing this contact operates for that purpose only when at center position and When all other circuit closing devices are in open condition.

lVhat I claim is:

l. In a recentering device for elevator control, an electric contact involved indirectly in the completion of circuits for causing the operation of the elevator in either direction, other contacts involved directly in causing the operation of the elevator, mechanical means for the closing ot all of said contacts so arranged that the first contact is mechant cally closed when the others are open, and electrical means for holding said lirst contact closed independent of the position of the mechanical means.

2. In a cable operated elevator control, an electrical connection involved in such control, a mechanical device operated by the cable and serving to mechanically close said connection at any time when associated parts are at center position, and electrical means tor holding said connection closed when the mechanical device is moved to some other position, said electrical means being incapable of causing the closure of said electrical connection.

3. In a cable operated elevator control, an electrical connection involved in the operation of the elevator, an arm arranged to be moved to a position to close said connection, means operated by the cable for moving said arm to close said connection at any time when associated parts are at center position, and a magnet provided with an armature arranged to lock said arm in closing position.

f1. The combination with a motor and a. source of electric current therefor, of a contact involved in the completion ot' a circuit :tor the operation of the motor, an arm, mechanical means for moving said arm to close said contact, a magnet bridged upon the source of current, and an armature operated by the magnet and serving to lock said arm a-fter being moved to closing position by said mechanical means.

5.. The combination with a motor, a source of electric current therefor, and cable operated devices for connecting the motor to the source, of a cont-act involved in the completion of a circuit for the motor, an arm arranged to be moved to a position to close said contact but normally acting to open said contact when not held in closed position, means operated by the cable for moving the arm to close said contact, a magnet bridged upon the source of current, and an armature operated by the magnet and serving to lock said arm atter it has been moved to closing position by said cable operated means.

CARL J. ANDERSON.

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