US1040555A - Electric-motor mechanism for operating elevator-safeties. - Google Patents

Description

APPLICATION FILED MAY 19. 10ML Patented Out. 8, 19312.

UNTED STATES PATENT OFFICE.

AXEL MAGNUSON, OE NEW YORK, N.Y., 'AssIGNoR To o'rIs ELEVATOR COMPANY, OE JERSEY CITY, NEW JERSEY, A CORPORATION OE NEW JERSEY.

ELECTRIC-MOTOR MEGHANISM To all whom t may concern:

Be it known that I, AXEL MAGNUSON, a

Specification of Letters Patent.

a Application led May 19, 1908. Serial No. 433,780.

FOR OPERATING ELEVATOR-SAFETIES.

Patented Oct. 8, 1912.1

ported by a frame B comprising sides a and 'secured to the under surface of the ear citizen of the United States, residing in the, ioor, and a bottom c. Pairs of gripping l city of New York, in the county of New York and State of New York, have invented a new and useful Improvement in Electric- Motor Mechanism for Operating Elevator- Safeties, of which the :following is a speciication.

My invention relates to emergency brakes for elevator cars, and is adapted for use with that type of brake in which gripping jaws carried by the elevator car are adated to 'grip the vertical guide rails in the e evator shaft.

One of the objects of the present invention is to provide an electric motor for operating the brake-applying mechanism.

Another object of the invention is the provision of a manual device in combination with the motor for either applying or releasing the brakes.

Another feature of the invention resides in the means for.controlling the brake-Open ating motor.

Othei` objects of the invention will appear hereinafter, the novel combination of elements being set forth in the appended claims.

Referring to the accompanying drawings, Figure 1 is a general View showing guide brake mechanism for an elevator, and also showing diagrammatically the electric system of control for the hoisting motor. and brake-,operating motor; Fig. 2 is a fragmentary view of a modilication in which the brake motor is placed on top of the elevator car; Fig. 3 `is a diagrammatic View of an ,elevator system to which my invention may floor of the car, and, as here shown, 1s supjaws 4, 5 and 4', 5 are pivoted at 6 and 6 respectively, and are adapted to lgrip the stationary vertical guide rails 8, 8 The jaws are operated by cams 9 and 9 on the outer ends of short rods 10 and 10. Between these rods and in line therewith are two other rods 11, 11 mounted in bearings 12, 12 and having their inner ends provided with right and left-hand screw threads, respectively, to receive the correspondingly threaded safety drum 13. The adjacent ends of the rods l0, 11 and 10', l1 have right and left-hand threads to receive the inter nally threaded pinions 14 and 14C in mesh with rack bars 15 ,and 15. Between the rack bars is a small electric motor N comprising a magnet frame 16 secured to the frame'B and an armature 17 -mounted in bearings 18, 18. The armature shaft 20 is extended some distance beyond each end of the armature and has bearings in brackets 2l4 secured to the frame B. Keyed to the shaft 2O are pinions 22 and 22 meshing with the rack bars, and a sprocket wheel 24 connected by a sprocket chain 25 to a pinion 26 adapted to be operated by a hand wheel 27 located in any convenient position in the car. The safety drum 13 is operated by the mechanism shown in Fig. fl. A governor 35, of any suitable form, is located at the top of the elevator well. .Around the sheave 36 of the governor passes an endless rope 87 which is hcld taut by means of the weight. 38 and sheave 39 at the bottom of the well. The governor rope has the usual yielding connection with the lcar (l at 40, and passes over the directing pulleysl Lt1 and ft2 mounterl on the lower portion of the car, and thence to the safety drum 13 around which it is wound. l

The operation is as follows: Normally the govdrnor rope travels with the car and rotates the sheavesl at the top and bottoni of the well and also the centrifugal governor mechanism. llf'hcn the car speed exceeds a predetermined limit, the governor operates the gripping dcvice li3 to hold the governor rope stationary.l As the car continues to v longitudinally and carry with tion l havel herein shown-a well known sysconductor 29 Vsition with the motor at rest.

troller lever 57 in the car be. moved to the llett to bridge the contacts 58 and 59, a circuit will be established as ollows,-rom

. switch contacts 45,

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move, lthe governor rope will be discon-l nected from the car at 40 and the 'relative movement ofthe rope and carwill rotate the safety drum 13. drum 13 begins substantially at the same time the governor rope is gripped, and the rods 11 and 11 which are held against rotation immediately commence to move out them the pinions 14, 14', the rods 10, 10 and the cams 9, 9, the latter operating to apply the grip- ,ping jaws to the guide rails.

The present invention is especially adapted Yfor use with electrically operated and controlled elevators, and by way of illustratem -of electrical control in connection with 'my invention. rlhis system comprises a motor armature A, a shunt field winding S, reversing switches R, R', a potential 'switch l?, and a controller switch E in the elevator car. The positive and negative mains designated and respectively, are connected toany suitable source of current supply. Current from these mains is l supplied through the main line switch L, conductors 28 and 29, and potential switch P to the various motor controlling and operating circuits. The circuitthrough the potential switch magnet is asy tollows,-from the positive main' through the switch L, conductor 28, contacts 45. and 47, vwinding 49 of the potential switchmagnet, conductor 50, Asafety switch 51 in the car, conductor 53, switch 54, conductors 55 and 56, contacts 48 and 46, and switch L to the nega-tive main. This circuit is normally closed and receives current to hold the potential'switch closed so that current may be Vsupplied to the motor lvl. and controlling circuits.

' The parts are shown in their normal polf the conthrough the potential the positive main 47, conductor 60, magnet Winding 61, conductor 62, Contact 58, switch `versing 59, conductor 56, and to the negative main. The reversing switch R will now operate to close a circuit to the motor armature as follows,--from the positive main through the potential switch, conductors 60, 63,'reversing switch contacts 64, brush 65, armature-windings, lorush 6,6, reswitch contacts 67, and to the negative main. A circuit will also be established through the shunt field winding S' which may be 4traced through the conductor 60, reversing switch contacts 68, 69, 70, conductors 71, 72,1ield winding S, and conductor 73. rlhe motor armature and .field winding now receive clilrrent and the motor is operated to lift the car.. A reversal of the controller lever 57, Contact The motionvof the -switch opens the main motor meeste lever 57 effects a reversal of the motor in the well known manner. i

The circuit for. the brake motor N is controlled by the potential switch P and isopen at the contacts 30, 3l while the potential.

switch is closed. When the'potential switch magnet drops itsarmature, a circuit to the motor N is closed as follows,-,-rom the positive main through conductor 28, contacts 45, 30, conductor 32 to the motor, through the shunt field .and armature windings of the motor, conductor` 33, switch 34, conductor 52, contacts 31, 46, and thence to the negal tive main. A pilot la1np 77 is connected between the conductors 32 and 52 and serves to indicate when the potential switch is open.

Whenever the potential switch magnet solenoid releases its plunger, either on ac. count of ther'main line potential falling be-A low a predetermined value or the magnet circuit beingv interrupted at'any point, the

current supply will be cut oft from the hoist- 'mg motor M, and the usual yelectro-magnetic brake for said motor will be applied to bring the motor and car to rest. As the potential circuits, it also closes the circuit for the motor N which immediately commences to-rotate its armature and apply the emergency brakes. The

movement of the armature is transmitted through the pinions 22 and 22 and rack bars to the'pinions 14 and 14. The rotation ofthe pinions-14 and 14 on the'rods 11 and .11 .moves said .pinions and the rods 10 and 10 outwardly, and the rotation of the pinions on the rods 10 and l0 gives said rods an additional movement toward the gripping jaws. moved outwardly and operate the gripping jaws in an obvious manner.

1lt will be noted that the conditions for supplying current to the motors M and N are such that the'current supply to the hoist- The cams 9 and 9 are thusing motorv is always cutl off while the brake i' motor-N is receiving current; that is, the potential switch always keeps the current supply out olf from at least one of the motors.

V The emergency brake may be applied by the operator in the carat any time by opening .the safetyswitch 51 ink the potential switch magnet circuit.- Any of the usual automatic safety switches may -be placed in this circuit, as, for example, the stop limit switches that are automatically opened when the car nea-rs its limits of travel, the slack cable switch, or the speedl governor switch.

A switch lever 7 5 is'connected at one end to the cam 9 and holds the switch'54 closed while the cam is A-in its innerpositionand the gripping jaws released. When the cam is moved outwardly, however, to operate the gripping jaws, the switch 54 is opened to open the potential switch magnet circuit.

When the safety drum 13 is rotated auto-i niatically by the governor to apply the emergency brakes it will not only do so by a direct operation of the cams 9 and 9', but thc initial movement of the cam 9 will open ther switch 54 and effect the operation of the motor N which will increase the power and speed with which the cams are operated, while at the same time cutting ott' the current supply from the hoisting motor.

rlhc hand wheel 27 forms a convenient' means tor releasing the gripping jaws and bringing the rack bars back to initial position after the motor N has operated. 'It ma also be used either to relieve the brakes su ticicntly to permit the car to gradually slide down to a floor landing or any desired position after the brakes have been operated, or to tighten the gripping jaws and hold the car more firmly.

In the arrangement shown in Fig. 2 the motor N is placed on top of the elevator car instead oi. being placed under the car with its armature mounted on the shaft 20. A

' sprocket chain 80 connects the sprocket wheels Sl and 82 securedlrespcctively to the motor .shaft and t0 the Shaft 0f the hand wheel QT. The operation is the same as that ot the arrangement shown in Fig. l, the power from the motor in this instance being transmitted through the chains 8O and 25,19

' the shaft 20.

Various changes in the details of construe-I tion and arrangement of parts Iriight be made without departing from the spirit and" scope ot the invention, and I wish therefore not to be limited to the precise construction herein disclosed.

What l. claim as new and desire to have protected by Letters Patent of the United States is i.. In an elevator, the combination of im elevator car, ay car brake comprising brake members carriedby the car and cooperating stationary brake members, a rotary electric motor carried by the car, and positively driven operating connections between the motor and the said first-named members.

ln brake mechanism, the combination with gripping jaws, of a screw-threaded rod, a cam carried by the rod; a pinion mounted on the rod, an electric motor, and gearing between the niotor and said pinion.

3. Inbrake'mechanism, the combination with gripping jaws, of a rotary eleetricmotor, a rack and pinion operated by the motor lo apply the brake, and mechanism between the rackand pinion and the gripping jaws t'or operating the latter.

l. The combination with a gripping device, of a rack bar, power-transm1tting means between said parts, and an electric motor 'for operating the rack bar to apply the gripping device. i

5. The combination withal4 brake, of an automatically.operable device fo'r operating the brake, a second device for effecting, an additional operationof the brakeano an electric motor for operating said second device.

G. The combination with a brake, of an automatic device for operating the brake, mechanism for effecting an additional operation of the brake, an electric motor for operating said mechanism, and means operated by said device for controlling the supply o current to the motor.

7. The combination with a brake, of successively operative brake applying devices, one of which is automatically operable independent of the other, a rotary electric motor for operating one of said devices, and a switch operated by the other of said devices and `controlling the supply of current to the motor.

8. In an elevator, the combination with a car, of a car brake, a safety drum, operating means therefor, operating connections .between the safety drum and brake, additional brake-'operating mechanism, an electric Inotor for operating said mechanism, and means operated by the operation lof the safet-ydrum i toeifect a supply off current to the niotor.

9. In an elevator, the combination with a car, of a car brake, an electric motor for op erating the brakeya safety circuit, andmeans for automatically closing a circuit to said motor when the safety circuit is opened.

10. In an elevator, the combination with a car, of a brake, an electric motor for operating the brake, a source of current supply,

and a otential switch, operable to automatically c ose a circuit to said motor when' the potential switch is opened.'

11. In an elevator, the combination with a car, of an electric hoisting motor, a car brake,-an electric motor for operating said brake, a source of current supply, and an' electro-magnetic potential switch controlling the supply of current `to said motors and permitting current to only one motor at a time.

12. In an elevator, the combination with a car, o' an electric hoisting motor, a car brake, an electric motor for operating said brake, and an electro-ma netic potential switch controlling the supp y of current to the motors by opening the circuit of the brake magnet motor when ener ized and opening the circuit of the hoisting motor when denergized. 13. In an elevator, the combination with an elevator car, of a brake member carried by the car, a cooperating stationary brake member, a rotary electric motor on the car, brake operat-inlr mechanisml'connected to the motor and brake, and a hand, wheel connected to said mechanism.

l 14. n an evatol" h@ combination v 24J 1mm@ im this snecilcaton in the reseno'e of c l 9 v u n n 1 nu A' n car, of gulde falls, gapping jaws ifm said two subscmbmg vilt-messes.

ui e rfis meha ism for 0 efart 0" Said X g d C F- f P* n@ f. AXEL MAGNUSON. 25a-WS, a, rotaj] @lemme mcftm geared to sind l mechanism, and a hand Wheel gead i@ h@ iefsses' shaftg ofsad motor, Y Vf; KINNEAR,

In testlmony whereof, l have slgned my JNO. WOHNSIEDLER.

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Washington, 'El 2."

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