US3814215A - Elevator control apparatus - Google Patents

Elevator control apparatus Download PDF

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Publication number
US3814215A
US3814215A US00347690A US34769073A US3814215A US 3814215 A US3814215 A US 3814215A US 00347690 A US00347690 A US 00347690A US 34769073 A US34769073 A US 34769073A US 3814215 A US3814215 A US 3814215A
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Prior art keywords
advancer
floor
elevator car
synchronizer
speed
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Expired - Lifetime
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US00347690A
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English (en)
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Y Takahashi
M Takizawa
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Hitachi Ltd
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Hitachi Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B1/00—Control systems of elevators in general
    • B66B1/34—Details, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system
    • B66B1/46—Adaptations of switches or switchgear
    • B66B1/52—Floor selectors

Definitions

  • An elevator control apparatus comprising a synchronizer movable at a reduced speed proportional to the running speed of an elevator car, an advancer ar ranged for advancing movement on the synchronizer within a predetermined range for detecting a floor originating a call, and means for determining the running speed of the elevator car depending on the position of the advancer, hence the position of the floor orginating the call, relative to the position of the synchronizer, hence the floor position of the elevator car, when the advancer moves and stops at the position corresponding to the floor from which the call is originated.
  • a preadvancer is additionally provided for making advancing movement within a range outside the movable range of the advancer for detecting another floor originating another call so that it can detect calls originating from the range which is outside the detectable range of the advancer.
  • PATENTEDJUH 419M 331 4215 sum as or 13 PAIEIIIEIIIIIII 4 3.814.215
  • floor controller possesses three functions. It is the first function of the floor controller to detect a nearest serviceable call for an elevator car resting at one of the floors and to determine the running speed suitable for the service. It is the second function of the floor controller to deliver decelerating instructions andapply such instructions to an elevator car moving toward a floor in response to a call originated therefrom so that such elevator car can stop at the target floor.
  • the third function includes display of the position of an elevator car, previous notification of the arriving floor and various other signal display controls.
  • the floor controller is generally installed in the machinery room above the shaft and comprises essentially a synchronizer which makes vertical movement in synchronism with the movement of an elevator car and whose moving speed is reduced to about one one-hundredth of the running speed of the elevator car by a reduction gear unit, and an advancer which is advanced relative to the synchronizer in response to a call.
  • the advancer is advanced to a position corresponding to a floor from which a call is originated, and upon arrival at such position, an engaging member is actuated to engage a stopper fixed to the frame of the floor controller for stopping the advancer at such position. Then, the elevator car, hence the synchronizer following the movement of the advancer catches up with the advancer.
  • the relative movement between the synchronizer and the advancer is utilized for controlling the acceleration and deceleration of the elevator car.
  • the advancer In the conventional floor controllerin which the advancer is advanced to a position corresponding to a floor from which a call is originated, an increase in the rated speed of the elevator car results inevitably in an increase in the running distance required for the elevator car to attain this highest speed. Therefore, the advancer must be previously advanced by a distance corresponding to the running distance of the running elevator car.
  • the elevator car is rated to run at a speed'of 540 meters per minute.
  • the minimum running distance required for the elevator car to attain the speed of 540 meters per minute is of the order of 100 meters and this distance corresponds to the distance including about 30 floors of a building having floors vertically spaced apart by a pitch commonly employed in the art.
  • the advancer Inasmuch as the elevator car makes vertical movement, the advancer must make its free advancing movement within a range which is twice the movable range thereof.
  • the guide rail Iforthe advancer supported on the synchronizer must have a correspondingly large length and the size of the floor controller is increased correspondingly.
  • the floor controller is generally installed in the machinery room disposed above the shaft.
  • the floor controller can be accommodated within the space limited by the ceiling of the machinery room when it is adapted for controlling an elevator car rated at a highest speed of the orderof 400 meters per minute, but its height is increased to such an extent that it extends above the ceiling level of the machinery room when the rated speed of the elevator car is increased beyond the above value.
  • elevator cars rated at a higher speed are demanded and this demand provides a serious problem.
  • a floor controller comprising a synchronizer movable at a reduced speed proportional to the running speed of an elevator car servicing a plurality of service floor landings, an advancer disposed on said synchronizer so as to be movable within a predetermined range from the position of said synchronizer for detecting a floor originating a call, a pre-advancer movable within a range outside the movable range of said advancer for detecting another floor originating another call, and means for determining the running mode of the elevator car depending on the position of said synchronizer relative to the position of the calloriginating floor detected by said pre-advancer or said advancer.
  • the present invention having the feature above described is advantageous in that the size of the synchronizer and advancer, hence the overall size of the floor controller can be remarkably reduced and the floor controller can be accommodated within the machinery room with a large space margin even if it is adapted for controlling an elevator car operable with a high speed of the'order of 540 meters per minute.
  • a floor controller of the kind above described in which means for indicating calloriginating floors are disposed on the frame of the floor controller so that the deceleration pattern which cannot be obtained on the basis of the positional relation between said advancer and said synchronizer during running of the elevator car at a high speed can be produced on the basis of the positional relation between said synchronizer and said means disposed on the frame of said floor controller.
  • the present invention having the above feature is advantageous in that the small-sized floor controller can satisfy the functional demands described previously.
  • FIG. 1 is a diagrammatic view showing schematically the structure of a prior art floor controller for comparing same with the present invention
  • FIG. 2 is a diagrammatic view showing the basic principle of the present invention
  • FIG. 3 is a perspective view of a floor controller embodying the present invention.
  • FIG. 4 is an enlarged detail view of parts of FIG. 3;
  • FIG. 5 is a diagrammatic view showing the arrangement of means for detecting the position of an advancer realtive to the position of a synchronizer in the floor controller according to the present invention
  • FIG. 6 is a diagrammatic view showing the arrangement of means for detecting the position of the synchronizer in the floor controller according to the present invention
  • FIG. 7 is a diagrammatic view showing the structure of a zone position detector in the floor controller ac cording to the present invention.
  • FIG. 8 shows output waveforms of the zone position detector anda waveform converter and operation of a speed instruction relay in the floor controller according to the present invention
  • FIG. 9 shows the arrangement of the synchronizer, advancer and accessories in the floor controller according to the present invention.
  • FIG. 10 is an electrical circuit diagram of a circuit for controlling speed instruction relays employed in the floor controller according to the present invention.
  • FIG. 11 is an electrical circuit diagram of a circuit for controlling deceleration instruction relays employed in the floor controller according to the present invention
  • FIGS. 12 and 13 are electrical circuit diagrams of circuits for controlling floor relays employed in the floor controller according to the present invention.
  • FIG. 14 is an electrical circuit diagram of a circuit for controlling call detection relays employed in the floor controller according to the present invention.
  • F IG. 15 is an electrical circuit diagram of a circuit for energizing oscillating units employed in the floor controller according to the present invention.
  • FIG. 1 showing schematically the structure of a prior art floor controller for controlling an elevator car operating with a highest speed of 360 meters per minute in a building having floors
  • a driving tape 1 is connected to the elevator car to be driven at a speed which is the same as the speed of the car.
  • An output gear 2 of a reduction gear unit (not shown) is rotated at a reduced speed which is proportional to the running speed of the elevator car.
  • a driving chain 4 is trained between the output gear 2 and an idler gear 3.
  • a synchronizer 5 is vertically movably supported on a guide rail 6 and is driven by the driving chain 4 to make vertical movement at a reduced speed which is proportional to the running speed of the elevator car.
  • an advancer 7 is vertically movable on the synchronizer S.
  • a guide rail 8 for guiding the vertical movement of the advancer 7 is supported by supporting means 9 extending from the synchronizer 5.
  • a miniature motor is mounted on the synchronizer 5 for causing vertical movement of the advancer 7 in advanced relation with respect to the synchronizer 5.
  • the synchronizer 5 is at rest with its central portion registering with the position corresponding to the 13th floor on the floor controller.
  • the numerals shown on the righthand side of F IG. 1 represent the floor numbers.
  • the syncrhonizer 5 occupies the position shown by the solid lines in FIG. 1.
  • the advancer 7 has been at rest at the position corresponding to the 13th floor as shown by the broken lines until the elevator car, hence the synchronizer 5 movingupward from beneath stops at the 13th floor position.
  • the reference numeral 7' designates such position of the advancer 7.
  • the advancer 7 makes upward movement in a direction as shown by the arrow to be advanced relative to the synchronizer 5.
  • the advancer 7 continues to move upward until it reaches a position corresponding to an upper floor from which a call is originated.
  • the advancer 7 moving upward stops at the position corresponding to the 21st floor. This means that the floor at which the elevator car should stop next is detected and this floor position is memorized.
  • a detector on the advancer 7 detects successive detected elements disposed on the frame of the floor controller at positions corresponding to the floor positions, and means are provided for counting the number of the detected elements detected by the detector. This count represents the distance to be run next by the elevator car.
  • the highest speed of an elevator car differs depending on the running distance, that is, the number of floors to be passed thereby.
  • an elevator car having an operating range of more than ten floors and rated at a highest speed of 360 meters per minute is accelerated to run with the speed of meters per minute, meters per minute and ISO meters per minute when it runs from, for example, the lst floor to the 2nd floor, 3rd floor and 4th floor respectively, and the highest speed of 360 meters per minute is developed only when the elevator car runs from, for example, the lst floor to a floor above and including the l lth floor without stopping at any intermediate floors. This is necessarily determined from the requirements including provision of a comfortable sense of ride for passengers and the distance required for acceleration and deceleration.
  • the elevator car is instructed to run at a highest speed of 300 meters per minute due to the fact that the number of the elements detected by the detector on the advancer 7 is eight and the distance to be run by the elevator car is the range of from the 13th floor to the 2 lst floor.
  • the first function of the floor controller is to detect the distance between the elevator car and the floor originating the call and to determine the highest speed at which the elevator car should run for reaching such floor.
  • the elevator car leaving the 13th floor is accelerated up to the speed of 300 meters per minute during its upward movement and is subsequently decelerated.
  • the synchronizer 5 is now moved upward toward the advancer 7 which is at rest at the position shown by the solid lines.
  • the decelerating instruction signal is applied to the elevator car as a function of the position in order to minimize floor arrival errors.
  • the curve shown at the left-hand side of FIG. 1 represents the deceleration pattern for the elevator car under the illustrated relation between the position of the advancer 7 and the position of the synchronizer 5 shown by the solid lines.
  • the elevator car is gradually decelerated in the manner shown by the curve as a series of detectors 38 provided on the synchronizer 5 move past a detected element provided on the advancer 7.
  • the synchronizer 5, hence the elevator car is stopped when the synchronizer 5 is moved upward to the position at which the central portion of the synchronizer 5 registers with the advancer 7as seen from the deceleration pattern.
  • a position detector disposed in the shaft detects the physical position of the elevator car immediately before the elevator car is stopped so that the elevator car can be accurately stopped at the predetermined position.
  • the second function of the floor controller is to produce a deceleration pattern relative to the position of the elevator car.
  • the synchronizer 5 may be utilized to serve also as a means such as an indicator indicating the position of the elevator car, but this isnot the essential function of the floor controller.
  • the general outline of the floor controller can be understood from the above description, but a serious problem as described below arises in recent years. Due to the tendency toward construction of skyscrapers in recent years, elevator cars for servicing a longer service range are required and a higher speedis necessarily demanded. It is quite natural that a long distance run results in the increase in the height of the floor controller.
  • the floor controller shown in FIG. 1 differs from actual one since FIG. 1 is merely a schematic representation of the structure of the floor controller. Even if the pitch between the floors depicted in a reduced'scale in FIG.
  • the advancer 7 needn'ot detect calls within the range of from the l st to the25th floor andmay only detect 7 a call or calls originated from the range of from the 1st to the l Qth floor whenthe elevator car is-at rest atfthe lst floor. This isbecause the determination of the runhing speed of the elevator car is required only when the elevator car is instructed to run from, for example, the lst floor to the 10th or lower floor due to the fact that the elevator car is designed to develop its highest speed of 360 meters per minute only when it runs from, for example, the lst floor to the l lth or upper floor.
  • the floor number to which the advancer 7 should be advanced is inevitably increased when the highest speed of the elevator car exceeds 360 meters per minute.
  • theel'evator car isdesigned to run at a highest speed of 540 meters per minute
  • this highest speed can only be developed whenthe elevator car runs from, for example, the lst floor to the 17th or upperfloor provided that the speedcan be increased at a rate of 30 meters per minute as the elevator car passes from one floor to another. Therefore, the running speed must be determined depending on the running distance when the elevator car services the range of less'than sixteen floors.
  • the advancer 7 is requested to be capable of being advanced to the position beyond the position of the synchronizer 5 by the distance corresponding to 16 floors.
  • FIG. 1 shows that this results in a remarkable extension of the synchronizer 5 in the vertical direction and the height of the floor controller is remarkably increased to an extent that it is more than two times that designed for the highest speed of 360 meters per minute.
  • the present invention provides an improved floor controller having a remarkably reduced size.
  • the basic principle of the presentinvention will be described at first with reference to FIG. 2.
  • a pair of pre-advancers 42U and 42D are fixedly mounted on an advancer 7 so as to detect calls originated from the upper and lower floors than that detected by the advancer 7.
  • the length of the arm of three pre-advancers 42U and 42D is determined so that the pre-advancers are movable over a range which is greater than the movable distance of the advancer 7.
  • the advancer 7 in the prior art floor controller shown in FIG. 1 has had a limit in its movement such that it can only be advanced to the position corre sponding to the 11th floor when the synchronizer 5 is at rest at the position corresponding to the 1st floor.
  • the pre-advancer 42U moves with the movement of the advancer 7 to a position corresponding to the 12th or upper floor when the synchronizer 5 is at rest at the lst floor.
  • the synchronizer 5 and advancer 7 in FIG. 2 are shown entirely the same as those shown in FIG. 1. I r
  • the elevator car stands by at the lst floor and up calls are originated from the 4th and 19th floors. Due to the fact that the elevator car stands by at the lst floor, the synchronizer 5 occupies also the position corresponding to the lst floor on the floor controller.
  • the advancer 7 having been standing at the lst floor starts to move upward prior to the upward movement of the elevator car'so as to detect calls originated from the upper floors.
  • the pre-advancer 42U starts to detect calls from the upper floors includin the 12th floor. Since it is supposed that the callsCDandare only.
  • the advancer 7 detects the callbefore the preadvancer 42U detects the call@ Therefore, the ad- .vancer 7 stops at the position corresponding to the 4th fl2E1L99H9UF-.Tltl h -a nss sannot make upward movement any more and the callis not detected thereby.
  • this call is the call which should be serviced by the elevator car at first, and the elevator car, hence the synchronizer 5 starts to move upward toward the advancer 7 which is at rest at the position corresponding to the floor from which this call is originated.
  • the advancer. 7 and preadvancer 42U and 42D move upward and the call@ originated from the 14th floor is first detected by the pre-advancer-42U, but the advancer 7 does not stop and continues to move upward.
  • the advancer 7 moving upward reaches the position corresponding to the 8th floor as shown by 7"
  • the advancer 7 stops at such position by detecting the up calloriginated from the 8th floor.
  • Circuit arrangement is such that any memory stored in a memory circuit due to previous detection of other calls by the pre-advancer 42U is erased when the advancer 7 detects a call as above described.
  • the elevator car starts to move upward -.toward1 thcasSth; flQOIeiflgffihfiA manner above described.
  • tAfteristoppingr atithehrfithafloorrrtherelevathr eapstnts call detection again andiimbl/" tupwardefmmiit-helfih lfloo'rltidwardrasfloon frdmritehichfiaribtlier: oalliisleg'igiit am if thatifloorcan be solely detected.
  • a plurality of means 41XU, 4IXD, 14, and 42X are fixedly provided on the frame of the floor controller at a position corresponding to each of the floors serviced by the elevator car.
  • the stationary means 14 consists of pairs of receiving units 14L and 14R arranged in two vertical series opposite to the respective oscillating units 12L and 12R, and each pair of these receiving units ML and MR are disposed at a position corresponding to each of the floors. However, the position of these receiving units 14L and MR is adjustable in the vertical direction.
  • the Stationary means 15 and 42X represent receiving units disposed at a position corresponding to each of the floors.
  • the stationary means 41XU and 4IXD represent oscillating units mounted on the controller frame opposite to the respective receiving units 41GU and 410D, and the number of these oscillating units is equal to the number of the floors. However, these oscillating units 41XU and 41XD are not disposed at the exact position corresponding to each of the floors and they are displaced downward and upward respectively relative to the exact floor position by a predetermined distance. Although only one set of lating units 41XU, 41XD and the receiving units 41GU,
  • 41GD is such that'the oscillating unit 41XU is opposed by the receiving unit 4lGU at a predetermined point beneath each floor level when the elevator car is moving upward and the oscillating unit 41XD is opposed by the receiving unit 4lGD at a predetermined point above each floor level when the elevator car is moving downward, so that output signals appear successively from the receiving units 41GU and 4lGDdepending on the moving direction of the elevator car.
  • these movable means and stationary means operate as a contactless position detecting means.
  • the movable means 13 and 42 provided on the advancer 7 are advanced beyond the actual position of the elevator car as the advancer 7 is driven by the motor 11, and the advancer 7 is stopped at the position corresponding to the floor from which a call is originated.
  • the movable means 12 and 41 provided on the synchronizer 5 follow the movement of the movable means I3 and 42 with in suitably delayed relation.
  • contactless type relative position detecting means which will be described later are provided for detecting the difference between the relative positions of the advancer 7 and the synchronizer 5 arranged for vertical movement in synchronism with the movement of the elevator car.
  • a magnet 19 is mounted on the synchronizer 5.
  • an armature 20 is attracted to the magnet 19 and makes pivotal movement around a pivot pin 21.
  • an enlarged portion 22 of the armature 20 presses against abutment members 25 and 26 provided on cranks 23 33 are mounted on the bar 32 at positions corresponding to the actual floor levels serviced by the elevator .car, although only one of such stoppers 33 is shown in FIG. 3.
  • FIG. 4 is an enlarged perspective view showing parts of FIG. 3 in detail, and parts bearing the same reference numerals as those shown in FIG. 3 have been already described.
  • a mounting arm 35 extends horizontally from the advancer 7 and an oscillating unit 36 of a contactless switch is mounted on the mounting arm 35.
  • a mounting plate 37 is fixed to the synchronizer 5 and a vertical series of receiving units 38 are mounted on the mounting plate 37 opposite to the oscillating unit 36.
  • the oscillating unit 36 and receiving units 38 are arranged in a manner as shown in FIG. 5 for detecting the distance D between the synchronizer 5 and the advancer 7.
  • the oscillating unit 36 carried by the advancer 7 is advanced upward to the position corresponding to the floor from which a call is originated.
  • the receiving units 38U 38U and 38U, carried by the synchronizer 5 are successively brought to the position opposite to the oscillating unit 36 with the upward movement of the synchronizer 5, and when the elevator car stops at the target floor, the oscillating unit 36 takes the neutral position C.
  • the oscillating unit 36 carried by the advancer 7 is advanced downward, and subsequently,
  • the oscillating unit'36 and receiving units 38 constitute a relative position detecting means which detects the distance between the synchronizer 5 and the advancer 7 for generating a deceleration instruction signal.
  • Receiving units 38UL and 38DL are disposed at the opposite extremities of the vertical advancing movement of the ad vancer 7 relative to the synchronizer 5 so that the oscil lating unit 36 can be opposite by these receiving units at such extreme positions.
  • FIG. 6 shows the arrangement of the oscillating untis 41XU, 41XD and receiving units 41GU, 41GD.
  • the oscillating units 41XU and 41XD are mounted on the controller frame in the number equal to the number of the floors.
  • One or ones of these oscillating units 41XU and 41XD oscillate only when a call or calls are originated from the corresponding floor or floors and the remaining oscillating units do not oscillate as will be described later.
  • These oscillating units 4lXU and 4lXD are used to detect the relative positions between them and the synchronizer 5.
  • the elevator car is designed to run at a high rated speed of, for example, 540 meters per minute, a distance of about 50 meters is required for deceleration.
  • the oscillating units 41XU, 4lXD and receiving units 4lGU, 41GD are utilized for compensating for the reduction of the distance D.
  • the deceleration pattern is produced by the combination of the oscillating units on the controller frame and the receiving units on the cynchronizer 5 in the range in which the elevator car is sufficiently remote from the target floor and is running at a high speed, while in the low speed range in which the elevator car approaches the zone relatively near the target floor, the deceleration pattern is produced by the combination of the oscillating unit on the advancer 7 and the receivingunits onthe synchronizer 5.
  • a shielding plate detector 39 is secured to the mounting arm35 extending from the advancer 7 to constitute a zoner position detector 44 together with shielding plates 43 arranged in a vertical series on a bar 40 extending vertically within the controller housing.
  • the number of these shielding plates 43 is equal to the number of the floors of thebuilding although only two of them are shown in FIG. 4. Since the shielding plates 43 are disposed at positions corresponding to the floors, an output signal appears from the shielding plate detector 39 during the period of time in which the advancer 7 is present in the predetermined zone including the corresponding floor.
  • FIG. 7 shows schematically the structure of the zone position detector 44.
  • these coils L and L are magnetically coupled and an output appears from an output coil L
  • no output appears at an output terminal E(0) of a logic circuit 44L and an output appears at another output terminal C(0) of the logic circuit 44L.
  • the shielding plate 43 is inserted into the gap, the magnetic coupling between the coils L and L, is substantially lost and no output appears from the output coil L In this case, an output appears at the outputterminal E(0) and no output appears at the output terminal C(0).
  • FIG. 8 shows the output waveforms of the zone position detector 44 and of a waveform converter in a control circuit described later for generating a speed instruction signal in response to the application of the zone position detector output.
  • FIG. 9 shows the relation between the means for detecting the position of the synchronizer 5 relative to the position of the advancer 7 and means for generating such a deceleration instruction signal which cannot be obtained with the relative position detecting means depending on the relation between the shielding plate detector 39 and the shielding plates 43 and on the positional relation between the synchronizer 5 and the oscillating units 41XU and 41XD mounted on the frame of the floor controller.
  • FIG. 9 only those means associated with the upward movement are shown. The detection of the relative positions of the advancer 7 and the synchronizer 5 and the operation of the zone position detector 44 consisting of the shielding plate detector 39 and shielding plates 43 have been described already.
  • the receiving units 41GU to 41GU serve for giving a deceleration instruction signal during upward movement of the elevator car.
  • the receiving units 4lGU 41GU 41GU and 41GU are adapted to give the deceleration insturction signal for decelerating the speed of the elevator car from 450 m/min, 420 m/min, 390 m/min and 360 m/min respectively and are mounted on the synchronizer 5 at suitably spaced predetermined positions.
  • These receiving units 41GU are disposed opposite to the oscillating units 41XU and the number of these receiving units 41GU is equal to the number of the floors.
  • the receiving units 41GU used in the upward movment of the elevator car are displaced downward by a predetermined distance from the position corresponding to the floors of the building.
  • a call is originated from the 40th floor and the elevator car stands by at the 1st floor.
  • the elevator car moving upward from the 1st floor while being accelerated toward the 40th floor in response to the call is running at a speed of 450 m/min.
  • a circuit described later is ready for generating a deceleration instruction signal and the oscillating unit 41XU corresponding to the 40th floor is solely energized.
  • a deceleration instruction signal for decelerating the speed of the elevator car to 420 m/min from 450 m/min is generated due to the fact that the receiving unit 41GU is brought to' the position opposite to the oscillating unit 41XU Then, the receiving unit 41GU is brought to the position opposite to the oscillating unit 41XU -and a deceleration instruction signal is generated for decelerating the speed to 390 m/min from 420 m/min. In this manner, the receiving units 4lGU 41GU 4lGU are successively brought to the position opposite to the oscillating unit 41XU corresponding to the 40th floor originating the call so that the speed of the elevator car is reduced to less than 360 m/min.
  • the magnet 19 is deenergized and the engaging member 29 engages the stopper 33 corresponding to the 40th floor thereby stopping the advancer 7 at the position corresponding to the 40th floor. Then, when the synchronizer 5 moves upward to reach the point at which the speed of the ele-

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Elevator Control (AREA)
  • Control Of Transmission Device (AREA)
US00347690A 1972-04-05 1973-04-04 Elevator control apparatus Expired - Lifetime US3814215A (en)

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JP (1) JPS5237661B2 (xx)
AU (1) AU456776B2 (xx)
BR (1) BR7302401D0 (xx)
CA (1) CA969293A (xx)
GB (1) GB1422568A (xx)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050547A (en) * 1975-03-05 1977-09-27 Hitachi, Ltd. Floor controller for an elevator
US20110228212A1 (en) * 2006-06-23 2011-09-22 Pixeloptics, Inc. Electro-Active Spectacle Lenses

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5433413B2 (xx) * 1974-02-15 1979-10-20
DE2442865C3 (de) * 1974-09-06 1979-07-05 Hagenuk Vormals Neufeldt & Kuhnke Gmbh, 2300 Kiel Vorrichtung, insbesondere Manipulator, zum raschen Bewegen und genauen Positionieren eines Laststellglieds längs eines vorgegebenen Weges

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3051267A (en) * 1959-08-10 1962-08-28 Toledo Scale Corp Elevator control
US3160232A (en) * 1962-07-31 1964-12-08 Westinghouse Electric Corp Floor selector for an elevator control system
US3685618A (en) * 1970-01-16 1972-08-22 Hitachi Ltd A floor selector for an elevator car

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3051267A (en) * 1959-08-10 1962-08-28 Toledo Scale Corp Elevator control
US3160232A (en) * 1962-07-31 1964-12-08 Westinghouse Electric Corp Floor selector for an elevator control system
US3685618A (en) * 1970-01-16 1972-08-22 Hitachi Ltd A floor selector for an elevator car

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050547A (en) * 1975-03-05 1977-09-27 Hitachi, Ltd. Floor controller for an elevator
US20110228212A1 (en) * 2006-06-23 2011-09-22 Pixeloptics, Inc. Electro-Active Spectacle Lenses

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GB1422568A (en) 1976-01-28
JPS5237661B2 (xx) 1977-09-24
BR7302401D0 (pt) 1974-02-07
CA969293A (en) 1975-06-10
DE2316907A1 (de) 1973-10-18
AU456776B2 (en) 1975-01-16
DE2316907B2 (de) 1976-01-02
HK4277A (en) 1977-01-28
JPS48100841A (xx) 1973-12-19
AU5413973A (en) 1974-10-10

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