US1945502A

US1945502A - Electric elevator

Info

Publication number: US1945502A
Application number: US358219A
Authority: US
Inventors: Jr Joseph R Jackson
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-04-26
Filing date: 1929-04-26
Publication date: 1934-01-30
Anticipated expiration: 1951-01-30

Description

Jan. 30, 1934. J. R. JACKSON. JR 1,945,502

ELECTRIC ELEVATOR Filed April 26, 1929 6 Sheets-Sheet l INVENTOR W 7%: 7 (fr 01mm 2 A in U R r w r: l i 5 3 f 4 9 um NHH I IHMHI HWWI HI InunHHINNHIHJ 4 n $1 lllllllllllllllllli U 4. 1 I. Inn nnflfl hn nu hn a fll knl hhh lquwu L W 1 t I a r 1 i 4 Jan. 30, 1934. J. R. JACKSON, JR 1,945,502

ELECTRIC ELEVATOR Filed April 26, 1929 6 Sheets-Sheet 2 IN VEN TOR A TTORNE Y Jan. 30, 1934. J. R. JACKSON, JR 1,945,502

ELECTRIC ELEVATOR Filed April 26, 1929 6 Sheets-Sheet 3 INVENTOR:

ATTORNEY Jan. 30, 1934. J. R. JACKSON. JR 1,945,502

ELECTRIC ELEVATOR Filed April 26, 1929 6 Sheets-Sheet 5 S2 S1 U/L/DI A TTORNE Y Patented Jan. 30, 1934 UNITED STATES PATENT GFFICE 11 Claims.

The invention to be hereinafter described relates to electric elevator systems, and is an improvement upon that shown in my copending application Serial No. 267,716, filed April 5, 1928.

The system of said application is of the push button type in which a car automatically travels to and is brought to rest at a floor when a person at a floor presses a button, and an up or down travelling car can be stopped at any floor by a person at that floor without depending on stopping of the car by the operator in response to a call.

A supplemental system is provided which may be readily applied to existing elevator systems without material alteration thereof and without interference with ordinary operation of the elevator. This supplemental system may be applied to usual electric elevator systems whether of the rheostatic type or the variable voltage type, both of which are well known forms of electric elevator installations.

The supplemental system includes a panel having contacts thereon in the elevator control circuits, and the construction is such that variation is had in the time required for the car to decellerate to a stop at a floor, taking into account the resultant force urging the car toward a floor due to the weight of the car, the varying load thereon, and the counter weight. Deceleration should commence at a greater distance from a floor with resultant heavier loads than with resultant lighter loads. This is accomplished by means which is preset in response to operation of a weighing machine in the car.

In said application the weighing machine actuates a selector device mounted on the elevator car and connected by conductors with a position machine in the penthouse actuated by an electric motor which also adjusts the contact carrying panel to vary the time allowed for the car to decelerate to a stop at a floor.

A purpose of the present invention is to provide improved means for accomplishing this regulation. In carrying the invention into practical effect, the regulation initiated at the car and transmitted to the adjustable panel in the pent- 'hOuse utilizes an alternating current self-synchronizing or selsyn system for the transmission of angular motion.

Another purpose of the invention is to utilize the selsyn motor system to effect a control which will prevent a fully loaded car from stopping at floors response to pressure of floor buttons.

With the aforesaid and other purposes in view, the character of the invention may be best understood by reference to the following description of one good form of electric elevator system shown in the accompanying drawings, wherein:

Fig. 1 is a vertical section through an elevator system embodying the invention, some parts being shown in side elevation;

Fig. 2 is a horizontal section through the base of the elevator car, parts being broken away to show the weighing machine suspension in the base;

Fig. 3 is a vertical transverse section through the car base;

Fig. 4 is a vertical longitudinal section through the car base;

Fig. 5 is an elevation showing the panel of the supplemental control system, one of the selsyn motors and means connecting the same with the panel for adjusting the latter;

Fig. 6 is the wiring diagram of the selsyn motor system;

Fig. 7 is a conventional diagram of the selsyn motors; and

Figs. 8, 9 and 10 show the wiring diagram and instrumentalities associated therewith of the supplemental system. 80

Referring to the drawings, (Fig. 1) designates the car in the hatchway 2 suspended by cables 3 which pass around the drum 5 in the penthouse, and thence downward in the hatchway to the counterweight '7. The drum is driven by an electric motor 9 provided with a usual brake unnecessary to show in detail herein.

The elevator car (Figs. 2, 3 and 4) contains a shallow chamber 11 in which is mounted a weighing machine comprising a platform 13 which serves as the car floor. Projecting down from the platform are wedge-shaped lugs 15 resting on seats in yokes l7 and 19 of the weighing machine suspension, said yokes having ends pivotally mounted on bearings 21. The yoke 1'7 has an arm 23 overlying an arm 25 of the yoke 19, said arms being received by a ring 2'7. A coil spring 29 is interposed between the bottom of the base and the arm of the yoke 19, tends to rock the yokes upward, and is adapted to yield when a load is placed on the platform. The arm 23 is longer than the arm 25, and has a seat in the under side thereof engaged by a finger 31 on a rock shaft 33 projecting out beyond a side of the car.

To prevent dirt from reaching and interior ing with proper operation of the weighing machine, strips 35 of rubber or other suitable material are fitted into opposed grooves in the base a d g s of the platform.

ill

Fast on the rock shaft 33 are arms 37 (Fig. 1) connected by links 41 with a pair of arms 43 on a rock shaft at the top of the car on which is secured a toothed segment 45 meshing with a pinion 47 on the shaft of one of the selsyn motors 49 mounted on the top of the elevator car.

To look the weighing machine the rock shaft 33 referred to is provided with a cylindrical enlargement 51, and cooperating therewith are clamp shoes 53 carried by levers 55 pivotally mounted on the base and connected to cores of an electric magnet 57 carried by and located beneath the car base. Coil springs 59 are connected to the levers and brackets on the base. The construction is such that when the magnet is energized, the shoes will be released, and when the magnet is de-energized, the springs 59 will become effective to cause the shoes 53 to grip the cylindrical enlargement 51 on rock shaft 33 and thereby lock the weighing mechanism.

The motor 49 referred to, on the top of the car, is the transmitting motor of the selsyn system. The receiving selsyn motor 61 is located in the penthouse. These motors are provided with single phase windings 63 (Fig. 7) on their rotors or armatures and with

polycircuit windings

65', 65 and 65 on their stators. The polyphase windings of the two motors may be similar to a polyphase induction motor or alternating current generating windings. They are here shown as three-phase Y connected windings. It will be understood that the armature windings may be mounted on the stators, and the stator windings may be mounted on the rotors if desired. The single phase rotor windings are excited from a suitable source of alternating current supply, in the present instance shown herein as an alternating current generator 67 (Fig. 7) driven by an electric motor 69. The selsyn motors are excited by wires 71 leading to the rotors of said motors.

The rotor of the transmitting selsyn motor 49 on the car receives angular motion through the connections described extending from the weighing machine to the armature shaft of said motor. The construction is such that the motion given to the rotor of the transmitting selsyn motor will be imparted synchronously to the receiving selsyn motor 61 in the penthouse.

As stated, one of the purposes of this invention is to provide means for varying deceleration of the car to a stop at a floor, which is accomplished by means preset in response to operation of the weighing machine in the car and the selsyn motor system.

In the circuits to be described for the elevator, are sets of contacts which are mounted on a panel '73 (Figs. 1 and 5) adjacent a control board 75 in the penthouse. This panel is mounted on a suitable support 77, and at opposite ends of the panel are elongated slots 79 receiving pins 81 on the support. Fast on one end of the slide is a threaded lug or nut 83 receiving a screw shaft 75 which may be rotated by a gear train 62 and the rotor shaft of the ceiving selsyn motor 61.

The construction is such that the receiving selsyn motor rotor and the screw shaft will be turned in one direction or the other depending on increase or decrease in the load on the car, and the panel 73 will receive adjustments toward the right or left of Fig. 5. The effect of this adjustment in varying deceleration of the car to a floor will be hereinafter explained.

Referring now more particularly to Figs. 8, 9

and 10, the lines leading from the main control board of the present system comprise in the diagram feed line L, up-direction wire U, downdirection wire D, second speed wire S, and third speed wire S Assuming the elevator car is to travel down, the operator in the car presses a down button 101 in the car to complete a circuit which energizes the magnet 103 and is traced through line wire 105, stop button 107, wire 109, down button 101, wire 111, switch 113, contact 115, wire 117, contact 119, switch 121, contact 123, wire 125, magnet 103, wire 127 and line wire 129. Energization of the magnet 103 moves the switch 131 into engagement with

contacts

133, 135 and 139 which are in circuits similar to those made by the three speed car switch of the usual systems. In the usual system, if the switch engaged two of these contacts, one speed would be obtained, if it engaged three contacts, a second speed would be obtained, and if it engaged four contacts, a third speed would be obtained. In the present system the different speeds are not obtained in this way. Closing of the switch 131 completes circuits for full speed of the car, since deceleration of the car is controlled automatically by means to be described.

Since down button 101 is pressed momentarily, magnet 103 is made a holding magnet by a shunt around said button including wires 217 and 140, contact 140a, switch 421, contact 1401), and wire 1400 leading to wire 111.

Now it will be assumed that it is desired to bring the car down to the first floor. This is accomplished by pressing a button at the first floor in a circuit traced through main line 141, wire 143, contact 145, push button 147 at the first floor, contact 149, wire 151, contact 153, switch 155, contact 157, wires 159 and 161, magnet 153 and wire 165 to main line 167. Breaking this circuit de-energizes the magnet 163 and allows the switch 155 to open under the influence of gravity. As the car approaches a floor, a bridge contact carrier 169 is caused by travel of the car to reach contact 171. This carrier is mounted on a screw shaft 85 (Fig. 5) journalled in bearings on panel 73 referred to. Fast on one end of the shaft is a worm gear 87 meshing with a worm 89 on a shaft 91 carrying a grooved sprocketwhcel 93 connected by a sprocket tape 95 with the elevator car, the tape being maintained taut by a weighted pulley 97 (Fig. 1). As the car travels in the hatchway the tape rotates a sprocket wheel 3, and through the gearing described rotates the screw shaft 85, thereby causing the carrier 169 to move along the panel 75 to the right or left (Fig. 5) according to the direction of travel of the car.

The contact 169 carries a contact 173 which will engage the contact 171 on the board 74, completing a circuit for the down magnet 177 traced through main line 141, wire 179, wire 181, wire 183, contact 185, switch 187, contact 189, wire 191, contact 171, contact 173 on carrier 169, wire 193, contacts 100 and 102 at the receiving selsyn motor, wire 193a, switch E, wire 193b, wire 197, magnet 177, wire 199, contact 201, switch contact 205, wire 207, Wire 209. wire 217, wire 109, stop button 107 in the car, and line wire 105.

Magnet 177 is now energized, and it moves the switch carrier 219 which has thereon

switches

221, 223, 225, 227, 229 and 231, all of said switches being insulated from one another. The switches 225, 227, 229 and 231 are brought respectively into engagement with

contacts

233, 235, 237 and 239 rub which have current standing thereon respectively through

wires

241, 243, 245 and 247, which respectively lead to contacts 133, 13.5, 137 and 139 engaged by switch 131.

When the switch carrier 219 is moved by the magnet 177 as described, it moves switch 113 referred, out of engagement with contact 115, and this breaks the circuit to the down magnet 103. The car is caused to continue to travel by the circuits which include switches 225, 227, 229 and 231 which are respectively in engagement with

contacts

233, 235, 237 and 239. The circuit described for energizing the deceleration control magnet 177 was completed by engagement of the contact 173 on carrier 169 with contact 171. This condition is momentary, and the magnet 177 now becomes a holding magnet through a circuit which is traced through main line 141, wire 179, wire 180, wire 249, contact 251, switch 221 on carrier 219, wire 253, contact 255, bridge contact 193 on carrier 169, bar 195, wire 197, magnet 177, wire 199, contact 201, switch 203, contact 205,

wires

207, 209, 217 and 109, button 107, and line wire 105.

Next will be described the means for causing the deceleration of the car in coming to its stop. As the car approaches the floor, the carrier 169 after causing contact 173 to leave contact 171, will bring bridge contact 257 on carrier 169 into engagement with three

contacts

259, 261 and 263, and a bar 265, said contacts being of different lengths. A set of

contacts

267, 269 and 271 is provided for another floor, and a set of

contacts

273, 275, and 277 is provided for still another floor. A set of such contacts will be provided for every floor, three sets being shown herein for three floors for purposes of illustration, and all of said sets being mounted on the panel referred to. The bridge contact 257 on carrier 169 cooperates with all of these sets of contacts and bar 265. The bar 265 is connected by wire 279 with switch 22.5 on carrier 219. Contact 263 is connected by wire 231 with switch 227. Contact 261 is connected by wire 283 with switch 229. Contact 259 is connected by wire 285 with switch 231.

As the car approaches its stop, bridge contact 257 on carrier 169 will be brought into engagement with

contacts

259, 261 and 263. The bridge contact will move along said contacts and leave them in the .order named. When the bridge contact 257 leaves contact 259, it interrupts one of the circuits for the three speeds of the car driving electric motor. When the bridge contact 257 leaves contact 261, it interrupts another of said circuits, and when bridge contact 257 leaves the contact 263 it interrupts the final circuit and the deceleration control, and the car is thus brought automatically to rest at the floor.

When the car starts from the floor and is to make a stop at the next adjacent floor, although the car switch is thrust to full speed position, there is no time for the motor to build up full speed. On the other hand, when the car starts from the floor and is to make a stop at the second or third floor eyond, or when the car is running as an express, when the car switch is thrust to full speed position, the motor has suflicient time to build up full speed. When the car is travelling at express speed, -'the first step of deceleration should be initiated when the car is further from the floor than when the car is travelling at local or slower speed. Accordingly, means is provided which is operable in response to the speed of the car automatically to initiate the first step of deceleration at a greater distance from the floor when the car is running as an express than when the car is running at lower speeds. This means includes the governor 286 (Figs. 5 and 10) which may be located in the penthouse and may be rotated by the sprocket wheel 93 referred to, which is driven by the tape 95 connected to the elevator car. The worm shaft 91 has a bevel gear 286a thereon meshing with a bevel pinion 286?) fast on the governor shaft. The governor has a link 2860 connected to a lever 286d pivotally mounted intermediate its ends and having a contact 286a at the outer end thereof. The governor has a link 2% con nected to a lever 286g pivoted intermediate its ends and carrying a contact 28Gb at the outer end thereof.

Adjacent contact 286a are a pair of contacts 236i and 2861. The contact 2862' is connected to a wire 273, and a branch wire 273a leads therefrom to a contact 273?) adjacent the end of the contact 273 referred to. The contact 2367' is connected to a wire 2%, and a branch wire 274a leads therefrom to a contact 27 11) adjacent the contact 2731). A wire 276 tapped from wire 285 leads to the governor actuated contact 286a. Branch wires 276a and 27Gb lead from wire 276 to

contacts

267 and 273 respectively.

The construction is such that at low speed the governor actuated contact 286e will engage both of the contacts 286i and 2367', and the bridge contact 257 on carrier 169 will not initiate the first step of deceleration until said contact has left contact 274%). When the car is running as an express, the governor will have moved the contact 286e out of engagement with the contacts 236i and 2867, thereby interrupting the circuits includ ing the contacts 273?) and 274b, and the first stage of deceleration will be initiated earlier, that is, when the bridge contact 257 leaves the contact 273, and the car is at a greater distance from the floor.

When the car is running as an express, the circuits including both. of the contacts 27319 and 27 112 will be broken, but when the car is running at a slower speed, the circuit including the contact 2732) will not be broken, and deceleration will be initiated when the car is nearer the floor. When the car is running at a still slower speed, the circuits including both of the contacts 273!) and 27 1b will be closed, and deceleration will be initiated when the car is still nearer the floor.

The deceleration control has been described in respect to one of the floors, but it will be understood that it is the same for all of the floors. While for purposes of illustration two contacts have been shown adjacent each

contact

259, 267 and 273 in circuits controlled by the governor for varying the distance from the floor in initiating deceleration to stop, it will be understood that any number of such contacts in circuits controlled by the governor may be employed depending upon the high speed of the car.

The circuit for the down magnet 103 includes the switch 121 and

contacts

119 and 123, the arrangement being such that this circuit is broken on energization of the up-direction magnet 469, to be referred to. Similarly, the up-direction magnet cannot be energized when the down-direction magnet is energized.

Next will be described the circuit controlled by the button at the second floor for bringing the ear to a stop at that floor. This circuit includes wire 287 leading from line wire 1 11, contact 239, second floor push button 291, contact 293, wire 295, contact 297, switch 299, contact 301,

wires

303 and 305, magnet 307, wire 309 and line wire 167.

Before the second floor button 291 is pressed, the magnet 307 is in energized condition and the switch 299 is closed. When this button is pressed, the circuit to the magnet is broken, and the switch 299 opens under the influence of gravity. This initiates the operations already described for bringing the car to a stop at the second flour. The circuit for accomplishing this is traced through main wire 141, wire 179, wire 181, wire 311, contact 313, switch 315, contact 317, wire 319, contact 321, contact 173, wire 193, contacts 100 and 102 at the receiving selsyn motor, wire 193a, switch E, wire 193b, wire 197, magnet 177, wire 199, contact 201, switch 203, contact 205,

Wires

207, 209, and 217, stop button 107, and line wire 105.

Next will be described the circuit controlled by the button at the third floor for bringing the car to a stop at that floor. This circuit is traced through wire 323 leading from line wire 141, contact 325, third floor push button 327, contact 329, wire 331, contact 333, switch 335, contact 337,

wires

339 and 341, magnet 343, wire 345 and line wire 167. Before the third floor push bulton is pressed the circuit is completed and the magnet 343 is in energized position, and the switch 335 is closed. When the button is pressed the circuit is broken, the magnet is de-energized, and the switch 335 opens under the influence of gravity. On opening of the switch 335, a circuit is completed which is traced through line wire 141,

wires

179, 181 and 347, contact 349, switch 351, contact 353, wire 355, contact 357, contact 173, wire 193, contacts 100 and 102 at the receiving selsyn moior, wire 193a, switch E, wires 193b and 197, magnet 177, wire 199, contact 201, switch 203, contact 205,

wires

207, 209, 217 and 109, stop button 107 and line wire 105.

Means is provided for completing the circuits for the floor magnets, and energizing said magnets so as to close the switches which were opened by pressing the floor buttons. This is done so that after a floor button has been pressed to bring the car to a stop, any additional pushing of iioor buttons will not deenergize said magnets. Also, this means resets the swifches so as to be ready for calls after the car has left the floor to which it is called. Said means for the first floor magnet includes a circuit traced through line wire 141, wire 179, wire 180, contact 359, switch 223 on carrier 219, wire 361, bar 363, bridge contact 365, contact 367, wire 369, wire 161, magnet 163, wire 165, and line wire 167. When this circuit is completed by engagement of bridge contact 365 with bar 363 and contact 367, the first floor magnet 163 is energized, and the switch 155 is closed, thereby completing the circuit through the push button 147 as well as through the circuit just described, so that the magnet 163 becomes a holding magnet, and starting of the car and movement of the bridge contact 365 away from contact 367 leaves the magnet in energized condition and through the floor button circuit only.

To energize the second floor magnet 307 independently of the push button circuit and close the switch 299, a circuit is provided traced through line wire 141, wire 179, wire 180. contact 359, switch 223, wire 361, bar 363, bridge contact 365, contact- 371 wire 375, wire 305, magnet 307, wire 309, and line wire 167. This energizes the second floor magnet and closes the switch 299 and holds the switch closed independently of the push button circuit. When the car starts, the contact 365 leaves contact 371, and the switch is held closed by the circuit which includes the second floor push button.

The circuit for energizing the third floor magnet 343 and closing the switch 335 independently of the push button circuit is traced through line wire 141, wire 179, contact 359, switch 223, wire 361, bar 363, bridge contact 365, contact 373, wire 375, wire 341, magnet 343, wire 345 and line wire 167. This circuit energizes the magnet 343 and closes the switch 335 independently of the push button. When the car starts and the bridge contact 365 moves away from the contact 373, the magnet is held energized and the switch is held closed by the circuit which includes the third floor push button.

When the switch 219 has been closed by the magnet 177 to decclera'te and stop the car at the second floor, a circuit is completed which is traced through line wire 141, wire 179, wire 180, wire 249, contact 251, switch 221, wire 253, contact 255, wire 377, contact 379, bridge contact 193, bar 195, wire 197, magnet 177, wire 199, contact 201, switch 203, contact 205,

wires

207, 209, 217 and 109, stop button 107, line wire 105. Movement of bridge contact 193 out of engagement with contact 379 interrupts the circuit, deencrgizes the magnet 177 and allows the switch carrier 219 to open, thereby interrupting the circuits which bring the car to rest.

he circuits for the magnet 177 controlling deceleration of the car to the stop at the third floor is traced through line wire 141, wire 179, wire 180, wire 249, contact 251, switch 221, wire 253. wire 377, contact 381, bridge contact 193, bar 195, wire 197, magnet 177, wire 199, contact 201, switch 203, contact 205,

wires

207, 209, 217 and 109, stop button 107 and line wire 105. When the bridge contact 193 moves away from contact 381, the circuit just described is interrupted, the magnet 177 is de-energized, and the switch carrier 219 opens, thereby interrupting the circuits which bring the car to rest at the third floor.

When the down magnet 177 is energized, the switch carrier 219 is moved so as to throw the switch 113 out of engagement with the contact 115, thereby interrupting the circuit to the downdirection magnet 103. This allows switch 131 to open, thereby interrupting the main feed lines for causing down-travel of the car, and these circuits are now completed through the switches 225, 227, 229 and 231 on the carrier 219. When the circuits are set for up-travel of the car, the down-direction magnet 17'? cannot be energized, since its circuits are broken by switch 203.

To enable the operator in the car to stop the down-travel car at any floor, push

buttons

401, 102 and 403 are provided in the car. completed by pressing button 401 through line wire 141, wire 17.9,wi1'e 333, wire 384, contact push button 401, contact 307, wire 389, contact 391, bridge contact 193, bar 105, wire 197, magnet 177, wire 199, contact 201, switch 203, contact 205,

wires

207, 209, 217 and 109, stop button 107, and line wire 105.

Next will be described the circuit completed by pressing button 402 the car to bring the downtravel car down to a stop at the second floor.

This circuit is traced through line wire 141, wire 179, wire 333, wire 384, contact push button 402, contact wire 2307, contact 399, bridge contact 193, bar 19.", wire 197, magnet 3.77, wire 199, contact 201, switch 203, contact 205, wires The circuit is traced 207, 209 217 and 109, stop button 107 and line wire 105.

The circuit completed by pressing button 403 to bring the down-travel car to rest at the third floor, is traced through line wire 141, wire 179, wire 383-, wire 384, contact 406, button 403, contact 408, wire 405, contact 407, bridge contact 193, bar 195, wire 197, magnet 177, wire 199, contact 201, switch 203, contact 205,

wires

207, 209, 217 and 109, stop-button 107, and line wire 105.

Pressing any one of

buttons

401, 402 and 403 will complete a circuit which energizes the magnet 177 and causes deceleration of the car as previously described. This circuit for said magnet is completed when the bridge contact 193 is in engagement with any one of the

contacts

391, 399 and 407, and the car is in a stopping zone. Engagement of the bridge contact 193 with any one of the

contacts

391, 397 and 407 is momentary, and is interrupted before the car comes to a rest, in order to energize the magnet 177 momentarily and close the switch carrier 219. The circuit to the magnet 177 is completed independently of the engagement of the bridge contact 193 with

contacts

391, 399 and 407 through the circuit including the switch 221 on carrier 219 as already described.

The circuits and instrumentalities for causing the car to travel up in the hatchway are similar to those described for down-travel of the car, and it is not thought necessary to describe these circuits and instrumentalities, but that it will be sufficient to mark them with reference numerals which shall be the same as those already used for corresponding parts, with the exception that number 4 will be the initial number of each reference, as for example, the up-direction magnet corresponding to the down-direction magnet 103 is designated 4103. Then on re-reading the description for down-travel of the car with reference to these higher numbers, ready understant ing can be had of the circuits and instrumentalities for up-travel of the car.

When the car is to be run as an express, the operator can open the switches E in the circuits for the down and up magnets 177 and 4177, thereby cutting out stopping of the car by pressure of the buttons at floors.

When the car is fully loaded, the rotor of the receiving selsyn motor will have turned sufficiently to cause an arm 409 (Fig. 9) thereon to rock a switch 411 carrying

contacts

102 and 4102 to move them respectively away from contacts 100 and 4100, thereby breaking circuits which prevent response of the car to calls for stops from buttons at iloors.

By this invention simple and efficient means is provided for adjusting the contacts in the electric circuits controlling the speeds of deceleration of the car to stops at floors. To accomplish this, the only connect ons required between the elevator car and the mechanism in the penthouse is the wiring from the transmitting selsyn motor on the car to the receiving selsyn motor in the penthouse.

It will be understood that the invention is not limited to the specific embodiment shown, and that various deviations may be made therefrom without departing from the spirit and scope of the appended claims.

What is claimed is:

1. In an el vator, the combination of a car, an electric motor for causing the car to travel in the elevator hatchway, and means for regulating the automatic speed changes of deceleration of the car to stops at floors including a selsyn motor system having transmitting and receiving motors, and means for turning the rotor of the transmitting motor to present the system prior to travel of the car.

2. In an elevator, the combination of a car, an electric motor for causing the car to travel in the elevator hatchway, and means for controlling deceleration of the car to stop at floors including different speed motor circuits having contacts, a bridge contact carrier moved by travel of the car to and past said contacts, and means including a selsyn motor system controlled from the car to adjust said contacts, thereby to initiate deceleration of the car at varying distances from a floor.

3'. In an elevator, the combination of a car, an electric motor for causing the car to travel in the elevator hatchw'ay, and means for controlling deceleration of the car to floors including a panel having sets of contacts thereon including a set for each floor for up -travel and a set for each floor for down-travel of the car, each of said sets having graded contacts, a pair of contact carriers, means actuated by travel of the car for moving one of the carriers past the up-travel contact sets, and for moving the other carrier past the down-travel contact sets, difierent speed motor circuits including said contact sets, and means including a selsyn motor system for adjusting said panel to increase or decrease the distance of approach of the carriers to said sets according to increase or decrease in the resultant car load.

4. In an elevator, the combination of a car, an electric motor for causing the car to travel in the elevator hatchway, and means for controlling the automatic speed stages of deceleration of the car to stops at floors including means on the car for weighing the load thereon, a panel having sets of contacts thereon including a set for each floor for up-travel and a set for each floor for downtravel of the car, each of said sets having graded contacts, a pair of contact carriers, means actuated by travel of the car for moving one of the carriers past the up-travel contact sets, and for moving the other carrier past the down-travel contact sets, electric circuits for the different motor speeds of deceleration including said contact sets, and means including a selsyn motor system controlled by the weighing means automatically to adjust the panel, thereby to increase or decrease the distance of approach of the carriers to said sets according to increase or decrease in the car load.

5. In a push button electric elevator, the combination of buttons at floors for up and down travel of the car, means operable on pressure of a selected up or down push button to cause the car to travel to and stop at the floor of that button, and means for regulating occurrence of the automatic speed stages of deceleration of the car to stops at floors, including a selsyn motor system having its transmitting motor mounted on the car, a weighing machine, and means for imparting motion from the weighing machine to the rotor of the transmitting motor.

6. In a push button electric elevator, the combination of a car, an electric motor for causing the car to travel in the elevator hatchway, buttons located at floors, means operable on pressure of a selected button for causing the car to travel to and stop at a floor, weighing means on the car for weighing the load thereon, and means for regulating occurrence of the automatic speed stages of deceleration of the car to stops at floors including a selsyn motor system adapted to be set in accordance with variations in the load on the weighing means, and means actuated by said selsyn motor system for preventing the car from responding to calls to floors when fully loaded.

7. In a push button electric elevator, the combination of a car, an electric motor for causing the car to travel in the elevator hatchway, buttons located at floors, means operable on pressure of a selected button for causing the car to travel to, and stop at a floor, including means for causing the car automatically to decelerate to said floor, weighing means on the car for weighing the car load, means including a selsyn motor system controlled by the weighing means having transmitting and receiving motors for regulating occurrence of the initiation of the automatic deceleration of the car to stops at floors, and means actuated by the receiving motor for preventing the car from responding to calls to floors when fully loaded.

8. In an elevator system, the combination of an elevator car, a driving motor for the elevator car, means for controlling deceleration of the car to stop the car at floor landings including different speed motor circuits, means for controlling the operation of the different motor circuits to initiate deceleration of the car at varying distances from the floor landings, a selsyn motor system operative from the car for actuating said control means for the difierent speed motor circuits, and means for operating said selsyn motor system in accordance with the load on the car.

9. In an electric elevator system, an elevator car, a driving motor for the elevator car, control circuits for the driving motor, including means for starting the driving motor and different speed motor circuits for decelerating the motor as the car approaches a floor landing, push buttons located at the floor landings for initiating the operation of said motor control circuits, means for controlling the operation of the different speed motor circuits to initiate deceleration of the car at varying distances from the floor landings, means including a selsyn motor system operative from the car for actuating said control means for the different speed motor circuits and means for operating said selsyn motor system in accordance with the load on the elevator car.

10. In an electric elevator system, an elevator car, a driving motor for the elevator car, control circuits for the driving motor, including means for starting the driving motor and different speed motor circuits for decelerating the m0- tor as the car approaches a floor landing, push buttons located at the floor landings for initiating the operation of said motor control circuits, means for controlling the operation of the different speed motor circuits to initiate deceleration of the car at varying distances from the floor landings, means including a selsyn motor system operative from the car for actuating said control means for the different speed motor circuits, means for operating said selsyn motor system in accordance with the load on the elevator car, and means actuatable by said selsyn motor system for preventing the car from responding to floor calls when fully loaded.

11. In an elevator system, the combination of an elevator car, a driving motor for the elevator car, call buttons at the various floor landings, means responsive to the actuation of a call button for decelerating and stopping the car, means for controlling the response of the decelerating and stopping means to the actuation of a call button, a selsyn motor system operative from the car for actuating said control means, and means for operating said selsyn motor system when the car is fully loaded to prevent the car from responding to floor calls.

JOSEPH R. JACKSON, JR.