US2210695A - Elevator control system - Google Patents

Description

A g- 1 R. H. WAGNER 2.210,.695

ELEVATOR CONTROL SYSTEM Filed April 13, 1959 2 Sheets-Sheet l 39E PM/O 3raf/ Paar 0/ 5/ S Egg 6? 40 ue U6 DC Q De INVENTOR fafierf/ih agnerf WITNESSES: 52% I BY Aug. 6, 1940.

R. H. WAGNER ELEVATOR CONTROL SYSTEM Filed April 13, 1939 2 Sheets-Sheet 2 Zens/f0 Facurag INIVENTOR M ATTORNEY WITNESSES: n Ki? Patented Aug. 6, 1940 PATENT OFFICE ELEVATOR CONTROL SYSTEM Robert H. Wagner, Glen Rock, N. J., assignor to Westinghouse Electric Elevator Company, Jersey City, N. J., a corporation of Illinois Application April 13, 1939, Serial No. 267,551

9 Claims.

My invention relates toelevator control systerns and more particularly to such control systems as embody an arrangement of light and light-sensitive cells for effecting deceleration,

stopping and leveling of the cars at the landing floors.

One object of my invention is to provide a light-sensitive relay system of the above-mentioned character which shall be simple and inexpensive to install and maintain in operation, and which will effect the deceleration, stopping and leveling of an elevator car in a more accurate manner than has heretofore been accomplished.

Another object is to reduce the number of parts required in light-sensitive cell, relay systems for decelerating, stopping and leveling elevator cars at their landing floors.

A further object is to provide a light-sensitive cell system in which the parts may be arranged to perform different functions under different conditions of operation and thereby effect a saving in the amount of apparatus necessary for an effective system. I

The invention is directed to an improved arrangement of lamps, light-sensitive cells, light controlling vanes and control apparatus which will efiect the landing of a car more accurately level with a floor andalso maintain it more accurately level with that floor while a stop is made thereat than heretofore.

For a better understanding of my invention, reference may be had to the accompanying drawings, in which:

Figure 1 is a diagrammatic representation of a one-car elevator installation having a lightsensitive cell control system embodying my invention;

Fig. 2 is an enlarged diagrammatic representation of the landing and leveling apparatus comprising the lamps, light-sensitive cells and controlling vanes illustrated in Fig. 1;

Fig. 3 comprises a diagrammatic representation, in what is known as the straight-line style, of the control system for operating the car shown in Fig. l; and

Fig. 3A comprises an explanatory illustration of the relays embodied in Fig. 3.

The relays in Fig. 3A are arranged with their the straight-line circuit may be readily determined.

For convenience, the relays included in the system are designated as follows:

U =Up direction switch D=Down direction switch E=Inductor relay for decelerating car S=Stopping relay for controlling inductor relay M=Inductor interlock relay V=Speed relay W=Speed relay G=Gate interlock relay UR=Up landing relay DR=Down landing relay UL=Up landing lamp DL=DoWn landing lamp UC=Up landing light-sensitive cell DC=Down landing light-sensitive cell Referring more particularly toqthe drawings, I have illustrated an elevator installation embodying a car C for serving a plurality of floors, only the second and third of which are shown. Although only two fioors are shown, it will be understood that the car may serve any desired number of floors. The car may be suitably suspended by a hoisting cable Ill which passes over azhoisting drum H to a suitable counterweight Referring to the control system for operating the car as shown in Fig. 3, the hoisting drum II is directly coupled by a shaft l3 tothe armature l4 of a suitable hoisting motor I5, the field winding I6 of which is connected, for constant voltage energization, to a source of supply designated by the supply conductors L+ and L. The hoisting motor is controlled by a variable voltage system wherein the armature I4 is connected in'a closed circuit with the armature l8 of a generator I9, which is provided with a cumulative series field winding 20 and a separately excited field Winding 2|. A pair of resistors TI and T2 are connected in the circuit of the separately excited field winding 2! for controlling the speed of the generator. The armature of the generator may be driven by any suitable motor (not shown).

A brake 23 operated by electromagnetic braking device 24 is provided for applying a braking effect to the hoisting motor ll through a brake drum 25 mounted on the shaft l3. The. brake magnet 24 is energized to release the brake when the car is running, and is deenergized to apply the brake to hold the car at a landing when the supply of power to the hoisting motor is cut off.

' The closure for theentrance tothe car may be any suitable means such as a door or gate 21 and it may be disposed to operate an interlock switch 28 for energizing a gate interlocking relay G to prevent operation of the car when the gate is opened, and also to interlock or render efiective other partsof the system. If desired, the car closure means may be motorized and connected to the control system so that stopping the car at a floor will cause the gates and doors to open automatically without manual operation, as set forth in the Hearn et a1. Patent No. 1,934,500, issued November '7, 1933, and the Ellis 1". et al. Patent No. 1,934,590, issued November 7, 1933, both assigned to Westinghouse Electric Elevator Company.

The direction and speed of the hoisting motor H may be suitably controlled by controlling the direction and the value of the excitation current supplied to the separately excited field winding M of the generator I9. The direction of the eX- citation current is controlled by an up direction switch U and a down direction switch D. The

value of the current may be controlled by means of speed relays W and V which include and exclude the resistors in the circuit of the generator field winding in accordance with the speed desired.

A' switch CS is mounted in the car for starting and stopping it. In starting the car, the'switch is moved in a counterclockwise direction to energize the up direction switch for starting the car upwardly and in a clockwise direction for energizing the down direction switch D to start the car downwardly. In stopping the car, the switch is moved to its center position to energize a stopping relay S which conditions the car control system to automatically decelerate and stop the car at the next floor.

The automatic stopping means responsive to energization of the stopping relay Sv comprises a decelerating inductor relay E for decelerating the car from its high speed to its intermediate speed and a pair of light-sensitive cell operated relays UR and DR for efiecting deceleration of the car from its intermediate speed to its stopping speed and for then effecting the cutting oif of the power and the application of the brake to stop the car at the landing for which the car has been decelerated and for maintaining it level with the floor while it stops at the landing. If additional steps of deceleration are desired, additional relays may be, embodied in the system for that purpose.

The inductor relay includes an electro-responsive or energizable coil and core E and contact members El and E2 mounted on the car in position to be operated by the influence of inductor plates of magnetic material mounted on the walls of the hatchway. An up direction plate and a down direction plate are associated with each floor for operating the relay when the car is tobe decelerated for astop at that floor.. The up plates are designated as 2U'E and 3UE for the second and third floors and the down plates for those floors are designated as ZDE and 3DE.

When the stopping relay is energized to decelerate the car for a stop, it energizes the inductor relay, and, as the car moves toward the floor at which the stop is to be made, the inductor relay comes opposite the inductor plate for the direction of the stop and is thus caused to open its contact members and thereby eifect deceleration of the car. Inductor relays of this character are-well known in the art and are illustrated and describedin the White and Hearn Patent No. 1,884,446. issued October- 25, "1932, assigned to Westinghouse Electric Elevator Company. Reference may be had to that patent for further details as to such relays, if desired.

When the car is making a down stop, it is first decelerated from its intermediate speed to its landing speed by the up relay UR and is then stopped by the down relay DR. When the car is making an up stop, it is first decelerated from its intermediate speed to its landing speed by the down relay DR and is then stopped by the up relay' While the car stands at the landing, the relays UR and DR act as leveling relays; that is,

' if the car drops below the floor level, the up relay UR. brings it up level with the floor; and, if the car rises. above the floor, the down relay DR brings it down level with the floor.

The relays UR and DR are associated with and are'controlled by an up light-sensitive cell UC and a down light-sensitive cell DC. The light-sensitive cells are mounted in approximately a horizontal line on the car. The use of lightsensitive devices such as the relay UR and the cell U0 is old and well known in the art. Therefore, no; detailed description thereof will be given. However, if more details are desired, they may be obtained from the Keiper Patent No. 2,000,703, issued May '7, 1935, and assigned to the Westinghouse Electric Elevator Company.

Inlpracticing my invention, I provide a novel arrangement of light devices for illuminating the light-sensitive cells by mounting an up light device or lamp UL and a down light device or lamp DL on the car in approximately a vertical line between the light-sensitive cells, the up lamp being disposed above and the down lamp being disposed below the horizontal alinement of the cells.

When a stop is to be made at a floor, the lamp corresponding to the direction of the car is lighted to efiect deceleration and stopping. This is effected by selectively connecting the lamps to some part of the control system, responsive to the direction of operation, for instance, as in the present case by connecting them to be controlled bythe direction switches U and D. While the car is at the floor, both lamps are lighted to maintain it level with the floor. The lighting of bothlamps may be caused by connecting them to the gates or doors or some part of the control system so that they will be automatically lighted While the car remains at the floor. In the present case,- both lampsare lighted for leveling purposes by connecting the, lamp circuitsthrough the door and gate interlock relay G.

An up-opaque vane or plate 2UP and a down opaque vane orplate 2D]? are mounted on the hatchway wall at the second floor landing to control the illumination of the cells by thelamps when the car is, making a'stop at the floor. The vanes are so disposed in staggered over-lapping position that, on an up stop at a floor with the up lamp lighted, the movement of the car will cause first the lower portion of the downvane to intercept the light from the up lamp to the down cell and next the lower portion of the up vane tointercept the light from the up lampto the up cell. Conversely, when the car is on a down stop at the floor with the down lamp lighted, first the upper portion of the up vane will intercept the light from the down lamp to the up cell and next the upper portion of the down vane will intercept the light from the down lamp to the down cell.

The-adjacent ends of the'vanes and the position of the lamps and cells should be so selected that, when the car is standing level with the floor at a landing, a downward movement of the car for a distance of approximately one-quarter of an inch will cause the lower end of the up vane to expose the up cell UC to the light from the down lamp DL and an upward movement of the car for a distance of approximately onequarter inch will expose the down cell DC to the light from the up lamp UL. Similar vanes are provided for each floor, those at the third floor being indicated as 3UP and 3DP.

The invention may be better understood by an assumed operation of the elevator. The system may be placed in operation by closing the switches leading to the supply conductors L+ and L, thereby energizing the field winding l6 of the hoisting motor [5 to prepare it for operation. Inasmuch as the car switch CS is centered, the stopping relay S is also energized by the closing of the switches 30. It will also be assumed that the car is standing at the second floor with the car gate 2! in open position, thereby preventing the gate interlock relay G from being energized becausethe cam operated contact members 3| are open.

It will be assumed now that the attendant or a passenger enters the car and closes the car gate 21 and moves the car switch CS in a counterclockwise direction to start the car upwardly.

The closing of the gate or door 27 closes the gate contact members 3|, thereby energizing the gate interlock relay G, which in turn opens its contact members G4 and G5 to prevent the simultaneous lighting of both the lamps UL and DL While the car is traveling.

. The movement of the switch OS for the up direction opens its contact members 32 and 33, thus deenergizing the stopping relay S, and closes its contact members 34 and 35, thus energizing the up direction switch U and the interlock relay M by the circuit:

L+, G2, 34, 35,115, U, M, r.

The energized relay M closes its contact members MI and thereby prepares the inductor relay E for energization when a stop is to be made. The energization of the up direction switch U closes its contact members Ul, U2, U3, U4, U6 and U1 and opens its contact members U5; The

closing of the contact members U2 energizes the brake coil 24 to release the brake 23. The closing of the contact members UI and U3 energizes the generator field winding 2| by the circuit This energizes the generator l9 to cause the hoisting motor I5 to start the car upwardly. The closing of the contact members U4 energizes the high speed relay V by the circuit L+, U4, El, V, GI, L.

The energized relay V opens its contact members Vi, thereby short circuiting the resistor rl, thus increasing the speed of the hoisting motor to cause the car to increase its speed. The closing of the contact members U1 energizes the up direction lamp UL sothat it may be utilized in stopping the car when a stop is to be made at a floor landing.

The closing of the contact members V3 energizes the speed relay W which closes its contact members WI, thereby short circuiting the resistor T2 in the circuit of the generator field winding which causes the car to run at its high speed. As the car moves away from the second fioor, its up lamp UL passes out from the side of the vanes 2UP and ZDP, thereby permitting the light from the up lamp UL to illuminate the up cell UC and the down cell DC. The operation of these cells energizes the up landing relay UR and the down landing relay DR.

(When the car passes a floor without stopping, the vanes at that floor will temporarily operate the up cell UC and the down cell DC to deenergize the landing relays UR and DR. However, this will not affect the system because the car switch and the speed relay V maintains circuits around the contact members of the relays UR. and DR until the car switch is centered for a stop.)

Assuming now that the attendant on the car decides to stop it at the third floor and centers the car switch for that purpose, the centering of the car switch will not deenergize the up direction relay U because that relay is now energized through the circuit L+, U6, V2, URI, D5, U, M, L.

However, the centering of the car switch closes its contact members 32 and 33, thereby energizing the stopping relay S to cause the automatic stopping system to stop the car at the next floor. The relay S effects this by closing its contact members S2 for energizing the decelerating inductor relay E by the circuit The energization of the inductor relay E prepares it for operation when it comes adjacent to the inductor plate for the next floor. As the car approaches the third floor, the energized relay E comes opposite the inductor plate 3UE and is thereby influenced to open its contact members El and E2, thus deenergizing the speed relay V to open its contact members V! and thereby reinsert the resistor TI in the circuit for the generator field winding 2!. The insertion of the resistor in the field winding circuit decelerates the car from its high speed to its intermediate speed.

As the car approaches closely to the third floor, the down landing vane 3DP enters between the up lamp UL and the down cell DC, thereby intercepting the light from that lamp to the down cell. The efiect of intercepting the light to the down cell causes the down relay DR to be deenergized and therefore open its contact members DRZ. The opening of the contact members DB2 deenergizes the speed relay W, which in turn opens its contact members WI, thus reinserting the resistor T2 in the circuit of the generator field winding and thereby decelerating the car to its landing speed. As the car approaches closely to the fioor, the up lamp UL and the up cell UC pass the vane 3UP which intercepts the light from the lamp UL to the up cell UC, thereby causing that cell to deenergize the up landing relay UR which opens its contact members URI in the circuit for the up direction switch U and the relay M and thus deenergizes the switch to stop the car and apply the brake. The opening of the contact members UI and U3 deenergizes the generator field winding 2!, and the opening of the contact members U2 deenergizes the brake coil 24 to hold the car at the floor. The deenergization of the inductor interlock relay M also opens its contact members Ml, thereby deenergizing the inductor relay E. The opening of the contact members U1 also deenergizes the up direction lamp UL and the car stops level with the floor.

By referring to Fig. 2, it will be noted that the a position level with the floor.

arrow 36 indicates the amount of upward drift of the car after the vane 3UP intercepts thelight from the lamp UL to the cell UCv This drift of the car may be calculated and arranged to be within very small limits, say, approximately one inch, with a landing speed of about thirty feet per minute. Hence it is seen that the car and its control system may be designed to stop the car every time approximately level with the floor and that there will be practically no overrun or underrun. I

It will be assumed that the attendant now opens the car gate 21, thereby operatingthe interlock switch 28 to open its contact members 3! and thus deenergize the gate interlock relay G. The deenergized gate relay G closes its contact members GI, G3, G 1 and G5 and opens its contact members G2. The closing of the contact members G4 and G5 energizes both of the up and the down lamps UL and DL to render them effective for any leveling operation that may be necessary while the car stands at the floor.

It will be assumed. now that the car while standing at the third floor drifts below the floor by reason of the stretching of the hoisting cables or for some other reason. By referring to Fig. 2, it will be seen that a very short drift downward, say even a quarter of an inch, willpass the light-sensitive cell U and the down lamp DL beyond the lower end of the up leveling vane 3UP, thus permitting the light'from the lamp DL to shine upon the light-sensitive cell UC and thereby so affect that cell that it will energizethe up direction leveling relay'UR to return the car to The energized relay UR. closes its contact members URI thus energizing the up direction switch U to move the car upwardly through the circuit L+, G3, SI, URI, D5, U, M, L.

The energized up direction switch closes its contact members U2 to energize the brake coil 24, thus releasing the brake 23, and also closes its contact members UI and U3 to energize the field winding 2 I, as previously described, for operating the hoisting motor I5 to move the car upwardly. As the car moves upwardly in its leveling operation, it moves the light-sensitive cell UC and the lamp DL upwardly past the lower end of the vane 3UP until that vane intercepts the light from the lamp to the cell as the car comes level with the floor. The interception of the light to the cell UC causes it to deenergize the up relay UR which, in turn, opens its contact members URI thus deenergizing the up direction switch U and the relay M. The deenergization of the up switch U opens its contact members UI and U3, thereby deenergizing the generator field winding to stop the car and opens its contact members U2, thus deenergizing the brake coil 24 and causing the brake 23 to be applied to hold the car level with the floor.

If the car drifts upwardly while at the landing, the up lamp UL and the down cell DC will be moved above the upper end of the down vane 3DP and this will permitthe light from the lamp UL to fall upon the light-sensitive cell DC, thus conditioning that cell to effect energization of the down relay DR. The energized down relay DR "will close its contact members DRI, thus energizing the down direction switch D through the circuit L+,G3, SI,'DRI, U5, D, M, L.

The energized downdirection switch D will close its contact members D2 to efiect the release of the brake 23, and the closing of the contactmembers DI and D3 will energize the generator field winding 25 to operate the hoisting motor I5, thus moving the car downwardly until it is level with the fioor.- ,As the car levels with the floor, the upper end of the vane 3DP intercepts the light from the lamp UL to the cell DC, thus causing that cell to effect deenergization of the down relay DR which opens its contact members DRI and thus deenergizes the down direction switch D, which in turn opens its contact members DI and D3 to cut oif the supply of energy to the hoisting motor and opens its contact members D2 to effect application of the brake 23 to hold the car level with the floor.

From the foregoing description, it will be apparent that my improved system in which the up lamp is placed somewhat above the horizontal line between the light-sensitive cells and the down lamp BL is placed somewhat below the horizontal line between the light-sensitive cells, will cause the leveling apparatus to be very sensitive to either a slight upward or a slight downward movement of the car. In fact, a movement of approximately only a quarter of an inch, in either direction from the floor level .will be sufiicient to cause the cell for the direction of movement of the car to be exposed to the light from one of the lamps and to be thereby operated to effect the return of the car to a position exactly level with the landing floor.

I It will also be apparent that the apparatus is very simple in arrangement and efiective in action to land a car level with the floor and maintain it level with the floor during its stay thereat.

Although I have illustrated and described only one specific embodiment of my invention, it is to be understood that many modifications thereof and changes therein may be made without departing from the principles involved in the invention as set forth in the following claims.

I claim as my invention:

1. A control system for an elevator car serving a floor landing in a hatchway comprising a pair of light-sensitive cells, a pair of light devices for illuminating the cells, a pair of vanes disposed to be moved between the light devices and the cells in response to movement of the car. for

controlling the passage of light from the light;

devices to the cells, means for causing one of the light devices to be lighted-during the approach of the car to a stop at the floor, means for lighting both light devices during the stop of the car at the fioor, and means responsive to operation of the cells as a result of the lighting of one of the light devices and the movement of the vanes between it and the cells for decelerating the car and stopping it at the floor and responsive to operation of the cells as a result of the lighting of both light devices and the position of the vanes for maintaining the car level with the floor during its stop thereat.

2. A light-sensitive cell system of control for an elevator car serving a floor landing in a.

hatchway and having a device for closing the entrance thereto, said system comprising an up light-sensitive cell and 'a down light-sensitive cell disposed in approximately a horizontal line on the car, an up light device and a down light device disposed in approximately a vertical line between the light-sensitive cells with the up light device above the down light device, means for lighting the light device corresponding to the direction of the car as it approaches a stop at thefloor, means responsive to opening of the closure device for lighting both light devices while the car stays at the floor landing, a pair of vanes mounted in the hatchway for controlling the light from the light devicesto the cells, one of said vanes being disposed to pass between one of the cells and the light devices and the other vane being disposed to pass between the other cell and the light devices when the car is to make a stop at the floor, and means responsive to cooperative action of the light devices, the vanes and the cells when the car is to make a stop at the floor for causing the car to be decelerated and stopped at the floor and maintained level with the floor during its stop thereat.

3. A control system for an elevator car operable to make a stop at a fioorlanding in a hatchway, comprising an up light-sensitive cell and a down light-sensitive cell disposed in approximately horizontal alinement on the car, an up light device and a down light device for illuminating the cells, said devices being mounted in approximately vertical alinement between the cells on the car with the up light device above the down light device, means responsive to operation of the car for lighting the light device corresponding to the direction of the car when the car is approaching a stop at the floor, an up opaque vane and'a down opaque vane mounted on the hatchway in position, when the car is making a down, stop at the floor, to cause first the up vane to intercept the light from the down light device to the up cell for operating that cell and next the down vane to intercept the light from the down light device to the down cell for operating that cell and when the car is making an up stop at the floor, to cause first the down vane to intercept the light from the up light device to the down cell to operate that cell and next the up-vane to intercept the light from the up light device to the up cell to operate that cell, and means responsive to operation of first the up cell and next the down cell when the car is making a down stop for first decelerating and then stopping the car, and responsive to operation of first the down cell and next the up cell when the car is making an up stop for first decelerating and then stopping the car at the floor.

4. A control system for an elevator car operable to make a stop at a landing floor in a hatchway, comprising an up light-sensitive cell and a down light-sensitive cell disposed in approximately horizontal alinement on the car, an up light device and a down light device for illuminating th cells, said devices being mounted between the cells on the car with the up light device above the down light device, means responsive to operation of the car for lighting the light device corresponding to the direction of the car when the car is approaching a stop at the floor, means for lighting both light devices when the car stands at the floor, an up opaque vane and a down opaque vane mounted in the hatchway in position, when the car is making a down. stop at the floor, to cause first the up Vane to intercept the light from the down light device to the up cell for operating that cell and next the down vane to intercept the light from the down light device to the down cell for operating that cell and, when the car is making an up stop at the fioor, to cause first the down vane to intercept the light from the up light device to the down cell to operate that cell and next the up vane to intercept the light from the up light device to the up cell to operate that cell, and means responsive to operation of first the up cell and next the down cell when the car is making a down stop for first decelerating and then stopping the car, and responsive to operation of first the down cell and next the up cell when the car is making an up stop for first decelerating and then stopping the car at the floor, and responsive to the operation of the cells by the lighting of both light devices and the position of the vanes and the car for maintaining the car level with the floor during its stay at the landing.

5. A control system for an elevator car operable to make a stop at a landing floor in a hatchway, comprising a closure device for closing the entrance to the car, an up light sensitive cell and a down light-sensitive cell disposed in approximately horizontal alinement on the car, an up light device and a down light device for illuminating the cells, said devices being mounted between the cells on the car with the up light device above the down light device, means responsive to operation of the car for lighting the light device corresponding to the direction of the car when the car is approaching a stop at the fioor, means responsive to opening of the closure device for lighting both light devices, an up opaque vane and a down opaque vane mounted on the hatchway in position, when the car is making a down stop at the floor, to cause first the up vane to intercept the light from the down light device to the up cell for operating that cell and next the down vane to intercept the light from the down light device to the down cell for operating that cell and, when the car is making an up stop at the floor, to cause first the down vane to intercept the light from the up light device to the down cell to operate that cell and next the up vane to intercept the light from the up light device to the up cell to operate that cell, and means responsive to operation of first the up cell and next the down cell when the caris making a down stop for first decelerating and then stopping the car, and responsive to operation of first the down cell and next the up cell when the car is making an up stop for first decelerating and then stopping the car at the fioor, and responsive to the operation of the cells by the lighting of both light devices and the position of the vanes and the car for maintaining the car level with the floor during its stay at that landing.

6. A control system for an elevator car operable to make a stop at a landing fioor in a hatchway, comprising an up light-sensitive cell and a down light-sensitive cell disposed in approximately horizontal alinement on the car, an up light device and a down light device for illuminating the cells, said devices being mounted between the cells on the car with the up light device above the down light device, means for lighting the light device corresponding to the direction of the car when a stop is to be made at the floor, and an up vane and a down vane mounted in the hatchway for controlling the light from the light devices to the cells, said vanes being so positioned as to cause, when the car is mak ing a down stop at the fioor, first the up vane to intercept the light from the down light device to the up cell to operate that cell for decelerating the car and next the down vane to intercept light from the down light device to the down cell to operate that cell for stopping the car, and, when the car is making an up stop at the floor,

first the down vane to intercept the light from the uplight deviceto the 'down cell tor-operate that cell. for decelerating the car and next the up vane to intercept light from the up" light device to the up cell to operate that cell forstopping V the car.

7. A control system for an elevator car operable to make a stop at a landing floor in a hatchway,

comprising an up light-sensitive cell and a down device and a down'light device for-illuminating the cells, said devices being mounted between the cells on the car with theup light device above the down light device, means for lighting the light-device corresponding to the direction of the car when a stop is to be made at the floor, means for lighting both light devices while the car stays at the landing floor, and an up vane and a down vane mounted in the hatchway for controlling the light from the light devices to the cells, said vanes being so positioned as to cause, when the car is making a down stop-at the floor, first the up vane to intercept the light from the down light device to the up cell to operatethat cell for decelerating the car and next the down vane to intercept light from-the down'light device to the down cell to operate that cell for stopping the car, and, when the car is making an up stop at the floor, first'the down vane to intercept the light from: the uplight device to the down cell to operate that cell for decelerating the car and next the up vane to intercept light from the up light device to the'up cell'to operate that cell for stopping the car, said vanes being also disposed in slightly overlapping relation to cause them to intercept the light from both light devices to both cells while the car remains level with the landing. fioor during the stop thereat but to expose the down cell to the light from the up light device if the car moves upwardly during its stop at the floor'for operating the down cell to cause the car to return downwardly to the floor level and to expose the up cell "to the light-- froms the downlight device if the -car moves downwardly during" its stop'at the floor for operating'the up cell to cause the'car to return upwardly to the landing floor level.

8; In a slow down and leveling mechanism for an elevator car operable past a plurality of floors, the combination of means for moving said car in either direction past said floors; means for'causing said car :to slow down preparatory to stopping at any one of said floors; a movable means associated with said car, a stationary means associated with said fioor' and mechanism responsive to the cooperation'of said movable means and said stationary means for initiating stopping. a predetermined distance from said floor; leveling mechanism cooperating withpsaid stationary 'means in the event of movement of said car away from 'said floor; a leveling initiating circuit and means responsive to actuation'of said leveling mechanism to'cause car movement towards said fi'oor," and additional means responsive to said leveling initiating circuit for causing 'the cooperation of said movable means and said stationary means for initiating stopping ata different predetermined distance from said first: mentioned predetermined distance from said floor.

9. In a stopping device for stopping at a floor level an elevator car provided with a driving mechanism and a brake, the combination of 'mechanism'on the car, stationary mechanism associated with the floor for cooperation with said car mechanism; means'responsive to cooperation of said car mechanism and the floor mechanism for cutting oil power to the car driving mechanism and applying the brake at a'predetermined distance from said'floor, and additional means for changing the point of cooperation of said car mechanism and said floor mechanism to cause the power to be cut off from said driving means and the brake to be applied at a different predetermined distance from said floor.

ROBERT 'I-I. WAGNER.

Images