US979498A - Combined brake apparatus and switch mechanism. - Google Patents

Description

w. H. HULTGRBN. COMBINED BRAKE APPARATUS AND SWITCH MEGHANISM. APPLICATION FILED JUNE 21. 1907.

979,498, I Patented Dec. 27, 1910.

now HM: I

y W. 'H. HULTGREN. COMBINED BRAKE APIfABATUS AND SWITCH HEGHA NISM.

APPLICATION FILED JUNE 21, 1907.

Patented 1m 2?, 191a 5 BIRTH-SHEET 2.

'W. H. HULTGREN. COMBINED BRAKE APPARATUS-AND SWITCH MECHANISM.

APPLICATION FILED JUNE 21, 1907.

979,498. Patentgd Dec. 27, 1910 5 sums-sum s.

4a ii a 1 Q 'fi w. H. KHULTGREN. COMBINED BRAKE APPARATUS AND SWITGH' MEGHANISM.

iAPPIiIOATIOI FILED mm: 21, 1907.-

Patented Dad. 27, 1910.

5 Emma-Bum 4.

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: .vrazzbvct W. H. HULI'GREN. COMBINED BRAKE APPARATUSAND SWITCH MBUHANISH. APPLICATION FILED IUI Ii 11, .1901.

A mmnaeapemzz 1910.

EBEEETHiEETE.

UNITED STATES PATENT oEEIcE.

WILLIAM H. HULTGREN, OF PHILADELPHIA, PENNSYLVANIA, ASSliGNOB TO OTIS ELEVATOR COMPANY, OF JERSEY CITY, NEW

JERSEY.

JERSEY, A CORPORATION OF NEW COMBINED BRAKE APPARATUS AND SWITCH MECHANISM. 4

To all whom it may concern:

Be it known that I, WILLIAM H. HCLT- cans, a citizen of the United States, residing at Philadelphia, in the count of Philadelphia and State of Pennsylvama, have in- More particularly it is the object of 'my invention to provide the shipper sheave of an elevator with simple and efiicient means for effecting the operation of brake mechanism and the. operation of motor-cont olling means of a direct current elec ric motor.

Otherobjects of the invention will appear hereinafter, the novel combinations of elements being pointed out in the claims.

In the accompanying drawings, Figure 1 is a front elevation of my invention and Fig. 2 is a side elevation oi the same; Fig. 3 illustrates diagrammatically the circuits and' connections; and Figs. 4, 5 and 6 are modifications of the reversing switch: Fig.

7 is a view similar to Fig. 1 of a modificzr tion; Fig. 8 is a side elevation of Fig. 7, and Figs. 9 and 9? show in front and side elevation a traveling nut forming'part of the sto )-motion device.

eferring to F igS. 1 and 2, the reference number 13 designates the housing of :1 worm wheel and 14 the worm casing of a wellknown type of hoisting apparatus. lo dcsignates the worm shaft to which is fixed the brake pulley 16. lhe brake comprises the bands 18 and 19 which'are secured at their lower ends to the bracket 20 which is an tension of the oil drip 21 secured at 22 to the right-hand end of the worm casing 14. The upper ends of the brake bands 18 and 19 are connected at the points 23, 24 to the lever 25 pivoted at 26 to an extension of the housing 13. The lever 25 forms part of the brake-applying means which comprises a link 27, connected at its lower end to the lever 25, and a cam-operated lever 28 to which the upper end of the link 27 is con nected. The lever 28 is pivoted to'a rod 29,- connected at its inner end to the lionsing 13. The inner end of the lever 28 has Specification of Letters 2mm, Patented Dec. 27, 1910. Application filed June21, 1907. Serial No. 380,087.

a fiat cam engaging surface 30,.extending horizontally beneath a cam 31. The cam 31 is ri idly connected to rectangular-frame 32 to wdiich in turn is connected the shipper sheave 33. When the sheave 33 is in its to central or normal position as shown in Fig.

1, the cam 31 is out of engagement with the contact surface 30, and the brake is applied.

The brake may be held in this positionby a weight 99 secured to the end of the lever 25. 65, \Vhen the shipper she'ave is moved in either direction, the cam 31 engages the cam surface and moves the lever 28 about its fulcrum. This operates through the link 27 to lift the inner-end of the lever 25, and re- .move the brake bands 23 and 24 from the brake wheel.

A slack cable device is rovided which comprises a lever 35 pivoted to an arm 36 which is secured to the housing 13. 'The inner end of the arm 35 has pivoted to it a .link 37, which is connected at its upper end' to a horizontal arm 38 on the rock 5 aft 39. Carried by the rock shaft 39 are two vertical rock- arms 40 and 41 which straddle the .shaft 17 and have lugs at their upper ends engaging between the flanges 42 0 a slidable clutch member 43 feathered on the shaft 17. The clutch member 43 is adapted 'to be moved into engagement with a clutch member 44 connected to move with-the shiper sheave. The lever 35 is held in a horizontal position as shown in Fig. 2 by the tension of the cable in any well known-manner. \Vhen any slack in the cable occurs.

the outer end of the lever 35, which may be, weighted, will be moved downwardly.

This movement of the lever will operate through the link 37 to swing the rock shaft 39 and move the clutch member 43 into eu- 9F gag'ement with the member 4A. This will connect the shipper sheave for rotation with the shaft 17, and operate to permit the application of the brake and operate the motorcontrolling switches in a manner hereinafter fully described. i "lhe sto motion device is shown most clearly in Fig. 8. As here shown a portion of the shaft 17 issomewhat reduced in diameter and screw threaded. Adjustably secared to the threaded portion o:E the shaft for rotation therewith are the stops 45 and 46 between which is the traveling nut 47 shown in detail in Figs. 9 and 9. The nut 47 is'held against rotation independently of 19 t e nut 47. The nut 47 travels longitudinally of the shaft 17 as the shaft rotates,

A the shipper sheave being prevented from moving longitudinally; and as the elevator car reaches its lipoit of travel in either direction, the traveling nut en a es one of the stops 45, 46, andis rotat t ereby, carrying the shipper sheave with it, and stopping 'e elevator in a well-knownmanner. The

' traveling nut 47 also has aniarm 88 extendlever to release the brake bands.

. ing from one side and cured thereto in the same'manne'r.

guided between lugs 89 (Fig. 7) on the ship er sheave. The arm 88 extends undcrneat 1 the contact surface of a lever 28' formin partof a modified form of brake-operating device. The lever 28' is fulcrumed at 29 in a frame 29" secured to the housing 13. The outer end of the lever 28' is connected by a link 27 to the end of a lever 25' similar to the lever 25 in Fig. 1, and having the brake bands se- The' lever 25 has an extension 90 to which is secured a weight 91 which tends to swim the ien the shipper sheave is in its normal position as shown in Fi 7 the arm 88 on the traveling nut 47'hol s the lever 28 in a position to apply thebrake against the action of the weight 91. 'When the shipper; sheave is, moved in either direction, the. arm 88 is carried out of contact with the lever 28, allowing the weight 91 to operate the lever 25 and release t e brake.

Secured 'to the ship er sheave is a pendulum arm 92 to'which' is-adjustably se cured a weight 93. If the sheave is moved in a clockwise direction this weighted arm 92 will be moved upwardly and pasta vertical position, and tend to hold 'the sheave in position with the switch contacts in engagement with each other as hereafter described. If the sheaveis moved 'is a coun-' terclockwise direction, the weighted arm will be moved downwardly, but not far enough to carry it past the center to the right hand side. The weight will therefore operate to firmly hold the switch closedagainst accidental displacement when the shipper sheave has been moved in either direction. The.range of movement of the shipper sheave 'is limited in each direction by stops 95, 96 on the sheave engaging fined stops 97, 98, respectively.

Theelectri'cal. circuits for the motor are automatically controlled by switches associated with the shipper sheave or flier and operated thereby. These switches will now be described. Secured to the casing 14, (Fig. 2) is a bracket 50, to which is b0ltd a U-shaped frame 51. To the frame 51-are secured insulating plates 52, 52' which support re ectively the'fixed contacts 53, 54',

contact 55. blade 57, contact 54 connected across the the switches. Carried b the shipper sheave are two pairs of knife b sides 56, 56 and 57, 57 arrun ed to enga 'e with the fixed contacts or c ips when he sheave is oscillated in either direction. The blade 56 is arranged to electrically connect the contacts 53, 54, 55, the blade 56, the contacts 82, 72, 83 and so on. :The knife blades are pivoted at 58, and

are normally-held in'alvertical parallel position against an intermediate block 59, by a coil spr n 60 uniting the-upper ends of the. knife bla es. snap action or quick opening 'of the switch. Ifa knife blade 56 is moved into on age ment with the contacts 53, 54, 55, an the sheave is then moved'in'the' opposite direction, the knife blade 56 will. be held in position'by frictional engagement with the clip contacts 53, 54, 55 and will swing on its piv6t,58 as the sheave commences to move back; The blade56, however, will be This arrangement insures a,

prevented. by the block 59 from swinging with-the blade 56.. The ends of the blades aretherefore separateduntilthe tension of the spring 60 overcomes the frictionv be-- tween the blade 56 and, the clips, and the blade is snapped out, breaking-the circuit qulckly and reducing the are following.

Fi n 3 shows diagrammaticallthe switc es, and motorand controlling circuits.

.The motor M which is adapted for use with .a direct current, has a shunt'field winding F, and a series winding G. An accelerating magnet H controjs' the series winding G and the accelerating resistance R. The main or armature circuits are represented by heavy lines, and the shunt circuits by light lines. The switch blades 56 and 57 are insulated from each other, but move together about the pivot 60, corresponding to the ivot for the shipper sheave. When these b ades are moved in a counterclockwise direction the blade 56will engage'with the contacts 53, 54 and 55 electrically" uniting them. The

blade 57 will at the-same time bridge the contacts 53, 54 and 55?. This closes ,a-circuit through the motor as follows:from

the positivemain by ,wire 61 to. and through contact 55', blade 57, contact 53', wire 63, brush 64, the armature, brush 65, wire 66, contact 55, blade 56, contact 53, wire 67, accelerating resistance R, wire 68, series winding G to the negative maifn. A' circuit is also closed through theshunt field F as fol= lows from positive main through wire' 61,..

wires 69,

70, and field winding F to the negative main. f

The accelerating ma et wmdm rushes of t e motor armature through the following circuit brush 64, wire 63, contact 53, blade 57, contact 54, wire .69, accelerating magnet H, wire 71,- contact 72, wire 7 3, contact 54, blade 56, contact 55 and wire 66 tothe brush 65.

is-also conla '-t main' It will thus be seen that when the switch is closed, as stated, the motor field will be excited, and a current also passes through the armature but with the resistance R and winding G in series. The accelerating mag net H which is constructed to operate its, arn'iatures T5, 76, 77, 78, successively in a well-known manner as the current through the magnet increases, will not at first operate, owing to the low potential across the armature, but as the speed of the motor increases and the connter-electro nn:t'ive-force rises, the accelerating switches are operated .1 successively to gradually cut out. the resistance R and winding G. The motor M is connected to the worm shaft in any suitable manner.

Theoperation of the elevator controlling devices will now be apparent. In Fig. l the parts are shown in their normal position of rest with the brake applied. If new the shipper sheave is moved, for example, to the left, the cam 31 will engage and operate the lever 28 to release the-brake as before explained. At the .same time the switch arms 56, 57 engage the cooperating switch contact clips and establish a circult through the motor M which is gradually brought up to speed, and operates through the worm' shaft 15 and hoisting shaft 17 to lift or lower the elevator car. When it is desired to stop thc' elevator car, the shipper sheave ishnovcd back to its ce'ntrzil position, which opens the motor circn' -and again applies the brake. If the shipper sheave is not operated mann ally beforevthe ca'r reaches its limit of movement, it will be. operated automatically by the traveling nut 47 of the stop motion de vice. which will engage one of the stops r 16, depending on the direction of travel of the can'and operate as before pointed out. If it is desired to move the elevator car in the opposite direction, the shipper sheave is moved in the reverse direction to close the apposite set of switches. This will send a current tl'n'or hthe motdr armature in the opposite direction and cause arevcrsal of the n'iotor. The circuit through the armature is now as follows,through wire-61,-

Contact 7!), blade 57, contact 81,- wire 66,

brush (35, motor arn1atui'e,-ln'ush (i4, \vire 63,

contact 9; 'blade 56, contact wire 67, l'tSlhtilflL'Gdi. wire 68-, coll G to the negative main. It will thus be seen that the current through the armat re is reversed but is in the same dire'ction through the series field winding G. The direction of the current tbr-mgh the shunt'ficld F also remains unchanged (being as follows: from the positive through wire 61, contact 79, blade 57, 80, wire 94', contact 51", wires 69, 7O

-a1'1d field windin F to the ne ative main.

In l igi' i is shown a somewhat modified arrangen'xent of switch contacts and switch lover. The lever 85 1S pivoted at 86 and comprises two switch blades 56, 57 insulated from each other as in Fig. 3. When moved to the leftthe blade 56 will bridge the contacts 53, 54, 55, and the blade 57 will bridge the contacts 53', 54, 55 the same as 111 Fig. 3; When the lever is moved in the op posite direction, corresponding contacts will be bridged. It will also be observed that the electrical connections between the various contacts in Fig. 4 are identical with those in Fig. 3. Figs. 5 and 6 show a modification in which the contacts are arranged in parallel rows. The blades 56 and 57 are here pivoted at one end to the base which carries the contacts. and as the blades are moved together in either direction, they will engage the same contacts as in Figs. 3 and 4.

l do not wish to be limited to the structural features, and arrangcn'icnts of parts disclosed, as various modifications might obviously be made therein by those skilled in the art without departing fromthe spirit of my invention, or changing its scope as defined in the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States is 1. In an elevator system, the combination .with a hoisting drum, of a motor, a shipper sheave, means operated by the shipper sheave for controlling the hoisting drum, and means connected to the shipper sheave and operated bygravity for holdingv the shipper sheave in its operated position in either direction. a

2.-ln an elevator system, the combination with a hoisting drum, of operating nicans therefor, a shipper sheave for controlling the operating means, and means carried by the shipper. sheave for yieldingly holding it in itsopcrated position, and means forlimiting the movement of said sheave in either direction.

In an elevator, the combination with a shipper sheave, of operating means therefor, brake apparatns controlled by'said sheave and means movable with the sheave for holding it yieldingly in its operated position with the brake released.

4. Tn-an. elevator, the combination of a shipper sheave operable in either direction, a brake controlled by said sheave, and a gravity operated device carried thereby for holding the sheave yieldinglyfin its operated position in ciher direction"with the brake released. 4 1

In an elevator, the combinationwith a shipper sheave movable from a central position n either direction about.its axis, of stops carried by the sheave, fixed stops in the path of i'i'iovcment of the first-named stops, to l mit the mov ment. of the sheave in either direction, and a weight carried by the sheave and movable into position to hold the sheave yieldingly at its limit of movement in either direction,

6. In an elevator system, the combination one contact of each series and the negative with a hoisting drum and an electric motor main having connections through the series therefor, of a shipper sheave, fixed contacts winding and starting resistance with anin the motor circuit, switch blades carried other contact of each series, conductors exby the sheave and movable therewith into tendinc' from the armature brushes and havenga ement with the fixed contacts, and a iug co..nections with another contact of each m we1g it carried by the sheave and movable series, another contact in each series electherewith into lposition to hold the switch trically connected, a connection between said blades yielding y in engagement with the last-named contacts and on ,terminal of the fixed contacts. shunt field winding, a direct connection be- 7. In an elevator, thecomb'ination with a tween the other terminal of the'shunt field hoisting drum, of a brake therefor, a stop winding and one of the mains, another conmotion device comprising a traveling nut, tact in each series, and electrical connection and means carried by the nut for positively bet ween said last-named contacts, and be; operating the brake. tween said contacts and one terminal of the 8. In an elevator, the combination with a accelerating magnet, a direct connection be hoisting drum, of a brake therefor, a ro tween the other terminal of the'accelerating tatable screw-threaded shaft, stops carried ma net and the shunt field contacts, contact by the shaft, a traveling member on the" bridging members insulated from each other shaft, and positive brake-applying connecand movable into one position in which one tions between said member and the brake. of the members bridges a positive main con-'85 9. The combination with a screw-threaded trct, a shunt field contact and an armature shaft, of a traveling nut thereon, a stop for brush contact, and the other member bridges the put, an electric switch com rising a staa negative main contact, an acceleratin tionfiry member and. a mem' r rotatable magnet contact and theother armature b'rus about the axis of said shaft, ahd a sliding contact, said cont-act bridging-members beconnection between the nut and said rotaing movable intoanother position in which table member. said first member bridges another 'positivc 10..Inan elevator, the combination with a main contact, another shunt field contact,

hoisting drum, of a brake therefor, operatand a contact connected to the other armaing means for the brake, a shipper sheave, a. ture brush, and'the other member bridges screw-threaded shaft, a traveling nut on the another negative main contact, another a c. shaft stops therefor, means carried by' the celerating magnet contact and the other artraveling not for controlling the brake,.and mature brush eontactQ means for reventin rotation ofthe travel- 14. In an'elevator system, the combinaingnut in ependent y of the sheave. 'tion with a hoisting drum, of abrake therev Inan elevator, the combination with a for, operating means for the brake, a direct hoisting drum, of a. brake therefor, a rota current motor, a shi per sheave mounted for table 'screw-threaded shaft, a traveling 'nut rotation in either irection, contact blades shaft, a traveling nut on the shaft, sto s for {:arried by the sheave, and extending out- .the nut carried by the shaft,a shipper sheav vardly therefrom, fined contacts in the mo- 10.: surrounding the shaft, a sliding connection 1, or circuit with which one of the contact between the shipper sheave and traveling {blades engages whenthe sheave is rotated in nut preventing independent rotative move .onedirection to close the circuit through the ment between the sheave and 'nut, and means, motor in one directiomand fixed contacts in carried .by the nut for actuating the brake-- the. motor circuit with which the other conoperating means when-the shipper sheave is" tact blade engages when the sheave is ro rotated. tated in the reverse direction to ,clpse a cir.--

12. In an elevator, the combination with a cuit through the motor in a reverse direchoisting drum, of a brake therefor, a'ro'ta- 'tion, and means carried by the sheave and table screw-threaded shaft, a traveling nut in enga ement with the brake-operating: 11-5 on the shaft, an arm-extending from the nut, means or applying the brake when the a lever in engagement with the arm, and -sheave is in its intermediate osition, said operative connections between the lever and means bein movable' with t 1e sheave in brake. 4 u either directronout of engagement. with the 13.. The combination with adirect current brake-operatingmeans. electric motor having a shunt field winding, In testimony wl'lereof. I have signed my of a source of current for the motor, a windname to this specification in the presence ofing in series" with the motor firnfiature, a two subscribing witnesses.

star-tin resistance in series wit t e armature 21%(1 -series winding, an accelerating ILLIAM j L ma net controlling the starting resistance Witnesses: an series winding, two series of contacts, Isaac Brena-mos,

W. I. (.loorr the positive main having connections with

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