US1448407A - Control system - Google Patents

Description

Mar. 13, 1923. 1,448,407,

H; 0. JAMES.

CONTROL SYSTEM;

FILED JAN.'8.1921- 2 SHEETS- $HEE;T 1.

WITNESSES: INVENTOR 1/1 12 ATTORNEY 4 H. p. JAMES. v

\ CONTROL SYSTEM.

FILED JAN. 3; [32b. 4 2 SHEETS-SHEET 2.

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WITNESSES: INVENTOR MW fl James Patent'edlMar. 13, 1923.

UNITED STATES PATENT orrice.

HENRY D. JAMES, OF EDGEWOOD PARK, PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC Jz MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VANIA.

CONTROL SYSTEM.

Application filed January 8, 1921. Serial No. 435,777.

To aZZ whom it may concern Be it known that I, HENRY D. JAMES, a citizen of the United States, and a resident of Edgewood Park, in the county of Allegheny-and State ofPennsylvania,-have invented a new and useful Improvement. in Control Systems, of which the following is a specification.

My invention relates to motor-control systems and it has particular relation to such systems'of control as are employed in connection with elevators, hoists and similar machines.

Oneobject ofmy invention is to provide means for effectively stopping the car substantially level with any floor, independently of the manipulation of the master switch.

Another object of the invention is to maintain the car substantially onthe level with the floor while loading, or unloading heavy material, such as --a motor truck. During such operation, stretching or shortening of the cables will afiect the level of the can platform with respect to the floor; Previously, means have been provlded for effecting slow-down and dynamic-braking actions, which, combined with the skill of the operator, would effect more or less satisfactory stops. Such means, however, did not compensate for stretching of the cables.

In the present invention, a standard elevator-control equipment is provided and car-switch control of the usual type is shown. Push-buttons may be substituted for the car switch in any standard system without affecting the object of my invention.

Additional equipment is provided com prising an auxiliary hoisting and controlling mechanism which becomes operative, upon the opening of any enclosure gate, to open the main motor circuit, to establish the auxiliary circuit and to render the auxiliary hoisting means operative through a clutch mechanism. The auxiliary motor operates the car at a greatly reduced speed through this clutch mechanism and, consequently, with more positive control of the car, independently of the load conditions.

At each floor, is provided a cam which engages a double-throw switch on the car to control a relay, the function of which is to establish a circuit for the auxiliary hoisting mechanism. Notches are provided in the cam so that, when the car is substantially level with any floor, the switch just referred to will maintain its inoperative position. lVhen the car is above or below the floor level, the switch assumes one of two operating positions to cause the car to be restored to its normal position.

In the accompanying drawings-- 1 Fig. 1 is a diagrammatic view of circuits and apparatus embodying my invention.

Fig. 2 represents a standard hoisting mechanism, with the addition of an auxil- 1ary hoisting mechanism for operating the hoisting drum through a gear-and-clutch mechanism. 1

Referring particularly to Fig. 1, a main motor,'having an armature 1 and a fieldmagnet winding, 2, is operatively connected to positive line conductor 3 and negative line conductor 4 in the customary manner, with an accelerating resistor 5 in circuit with the armature during the starting period. Contactors 6. and 7 represent the usualreversing means, and contactor 8 controls the accelerating resistor 5. A brake coil 9 is connected with the reversing contactors in the customary manner.

The apparatus thus far disclosed is old and its operation is obvious.

Assuming the carto be at rest, if the mas ter switch 10 is actuated to -the right, corresponding to the up direction of travel, a circuit is established for the coil 11 of contactor 6 which extends from positive line conductor 3, through L hatch-way limit switches 12, gate switches 13, conductor 48, conductor 14, coil 11, conductor 15, contact finger 16, masterswitch segment 17, contact finger 18 and conductor 19, to the negative line conductor 4. Actuating coil 11 now being energized, operates to close contactor 6 and thereby establish the usual motor connections.

A circuit is normally established for relay .coil 20 from positive line conductor 3,

the auxiliary motor. This represents the condition of normal operation.

When it is 'desired to stop the car, the master switch is returned'to the o-E position, releasing the up directional contactor 6, de-energizing the main motor and allowing its brake to set. It may be assumed that the car stops within a reasonable distance of the desired landing and that latter operation may engagement of the clutch members,

the operator opens 35 and conductor 36 to the negative/line conductor 4.

l/Vhen relay contact member 24 is disengaged fromcontact member 25, the circuit of coil 26 is broken,.the spring 30 effects the and the auxiliary motor is then in operative connection to the car. Coil 33, the 'circuit'for which has just been traced, closes'contactor 37 establishing a circuit for the auxiliary motor armature 38 and acircuit for the coil 40 which controls the auxiliary motor brake. The direction ofrotationof armature 38" is such as to actuate the car toward the desired landing and, during this period, the cam 39 is out of engagement with the switch meme ber 29, which member, under the action of spring 41, is in engagement with contact 31, establishes the circuit previously traced-for coil 33. When the'car reaches its normal position, substantiallylevel with thedesired landing, a notch in the cam returns the switch member 29 to its inoperative position, thereby de-energizing coil 33 anddisconnecting the auxiliary motor.

The operating circuit for the auxiliary motor extends from positive line conductor through conductors 42, 43, contactor 37, conductor 44, armature 38,'conductor45,

' contactor 37 and conductors 35 and 36, to

the negative line conductor 4. A circuit for the shunt field-magnet winding 46 is established between the positive andnegative conductors 43 and 36, respectively.

In case the car is to beoperated in the Fdown direction, the master switch'is actuated'to the left to establish a circuit for coil'47 of the reversing conductor 7. The operating circuit for this contactor is established from positive line conductor" 3, through hatch-way limit switch 12, gate contacts 13, conductor 48, coil47, conductor 49 master switch segment 1'? contact 18 an conductor 19, to the' negat ve line conductor The operation thereby obtained nection with a reversible motor is obvious.

The car is now operating in the direction opposite to that previously described. The progress of the car is arrested, as before, by returning the master switch to the off position, thereby As was described for the upward motion of the car, the same operation now takes place when the 'gate is opened to de-energize the clutch-magnet coil 26 and establish contact between relay contact member 24 and contact 27.- If the car comes to restbelow the desired landing, the operation of the auxiliary motor is as previously described.

If, however, the car stops above the landing,- the cam 39 forces the switch contact member 29 into engagement with contact member 51. A circuit, which is now estab lished for the actuating coil 52 of contactor in con-.

de-energizing the coil 47.

53, extends from positive line conductor 3,

through hatch-way switches 12, conductor 23, contact member 24, contact27, conductor 28, switch member conductor 54, coil 52 and conductors 34, 35

and 36, to negative line conductor 4. The.

circuit through'the armature 38'is now established in the opposite direction to that previously described and it extends from positive line conductor 3, through conduc-' tors 42 and 43, contactor 53, conductors 55 and 45, armature 38, contact0r.53 and conductors 35 and 36, to the negative line ,con-

ductor 4. The circuit for thearmature 38 is interrupted, as previously described, when the car becomes level with the landing, the cam 39 returns the contact switch .member 29 to its inoperative position.

A push-button switch 56 may be substituted for the gateswitches 13, with the same electrical connections; or the push-button switch may be used' in conjunction with the gate switches. This button is preferably located in the car'and' is foot-operated, to open the circuit previously described on approaching any landing. From the foregoing disclosure, it will be understood that'a substantially exact landing may be accomplished without the necessity of inching the car and without the necessity of becoming skillful in the manipulation of the [master switch. Therefore, when the car is stopped Within a reasonable distance of the landing, the operator may open the gate and cause the platform of the car to slowly attain the normal level. car operator and attendants are free to give undivided attention to the gate and to the load which is to be taken on or removed from the car. If, during the process, the car is moved a certain amount from its normal position,

the auxiliary 'ho'istingmechanism immedi- 29, switch contact 51, g

The

due to movement of the cables,

ately becomes operative to establish the normal level. The distance which the car may move from the normal level is established by the. contour of the cam 39.

I claim as my ii'i\"cntion:-

l. The combination with a car. an actuating motor therefor and means for controlling said motor. of additional means for actuating said car and means independent of the operating condition of said controlling means for governing the operation of said additional actuating means.

2. The combination with a, car, an actuat ing motor therefor and means Comprising a master switch for controlling said motor, of an auxiliary actuating motor for said car and means independent of the position of said master switch for governing the operation of said additional actuating meansv In an elevator, the combination with a car, controlling means therefor, and agate, of means controlled in accordance with the position of the'gate for effecting the actua tion of said car substantially to a floor level, independently of said controlling means.

4-. In an elevator the combination with a car, controlling means therefor, and a gate,

of means comprising a relay controlled in accordancewith the position of the gate for effecting the actuation of'said car substantially to a floor level, independently of said controlling means- 5. In an elevator, the combination with a war, controllin means therefor, and a gate, of means comprising a switch on the car to be controlled in accordance with the position of the gate for effecting the actuation of said car substantially to a floor level,,independently of said controlling means.

.6. In an elevator, the combination with a car, controlling means, and av gate, of means comprising a sw1tch on' the car, cams 1n the hatchway and'a relay controlled in accordance with the position'of the gate for effecting the actuation of said car substantially to afloor level, independently of said controlling means. i

7. In an elevator, the combination with a car, controlling means therefor, and agate,

of means comprising a motor controlled in accordance with the position of the gate for effecting the actuation of said car) substantially to a. floor level, independently of said controlling means.

8. The combination with a car, an actuating motor therefor and controlling means for said motor. of a gate, av relay'responsive to the. operation of the gate, additional means for actuating said car, and means comprising said relay for effecting the actuation of said car, substantially to a floor level, independently of said controlling means.

9. T he combination with a car, an actuating motor therefor and controlling means for said motor comprising a master switch, of a gate, a relay responsive to the operation of the gate, additional means for actuating said car comprising an auxiliary motor, a clutch mechanism, means for controlling said auxiliary motor and said mechanism comprising said relay for effecting the actuation of said car substantially to a floor level, independently of said master switch.

10. In an elevator, the combination with a car, controlling means therefor and a. switch, of means responsive to the operation of said switch for effectin the actuation of said car substantially to a floor level, in-

dependently of the adjustment of said controlling means.

11. In an elevator, the combination with.

a car, controlling means therefor and a manually operable switch, of means responsive to the operation of said "fecting the actuation of said car substantially to a floor level, independently of the adjustment of said controlling means.

12. The combination'with a car, an actuating motor therefor and a circuit for controlling the motor, of additional means for actuating the car and electro-responsive means independent of the condition. of said circuit for governingthe operation of said additional means. c

13. The combination with a car, a motor therefor. and a controlling circuit, of a manually operable switch in the car, means responsive to the operation of said switch for effecting the actuation of said car substantially to a. floor level and for maintainingsuch level independently of said con trolling circuit. 7

14. The-combination with a car,controlling means therefor and amanually operable switch inthe car, of a relay controlled by the switch for effectin the actuation of'said car substantially to afloor level and for maintaining such level independently of said controlling means.

In testimony whereof, I have hereunto subscribed my name this 22nd day of December, 1920.

' HENRY D. JAMES. I

switch for ef--

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