US3468401A - Screw-driven elevator - Google Patents

Screw-driven elevator Download PDF

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Publication number
US3468401A
US3468401A US599196A US3468401DA US3468401A US 3468401 A US3468401 A US 3468401A US 599196 A US599196 A US 599196A US 3468401D A US3468401D A US 3468401DA US 3468401 A US3468401 A US 3468401A
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United States
Prior art keywords
screw
elevator
nut
car
lift
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US599196A
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English (en)
Inventor
Emile Guillaume Joseph Letz
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LETZ AUFZUG Ets
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LETZ AUFZUG Ets
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B9/00—Kinds or types of lifts in, or associated with, buildings or other structures
    • B66B9/02—Kinds or types of lifts in, or associated with, buildings or other structures actuated mechanically otherwise than by rope or cable
    • B66B9/025—Kinds or types of lifts in, or associated with, buildings or other structures actuated mechanically otherwise than by rope or cable by screw-nut drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H2025/2062—Arrangements for driving the actuator
    • F16H2025/2096—Arrangements for driving the actuator using endless flexible members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
    • F16H25/2472—Safety nuts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
    • Y10T74/18576—Reciprocating or oscillating to or from alternating rotary including screw and nut
    • Y10T74/18656—Carriage surrounded, guided, and primarily supported by member other than screw [e.g., linear guide, etc.]

Definitions

  • An elevator comprising elevator shaft means defining a vertical elevator shaft, a cabin including at least one vertical wall position to move up and down said elevator shaft, a plurality of guide rails fixed vertically on said elevator shaft means, guide rollers arranged perpendicularly fixed to said cabin and riding on said guide rails, a screw vertically mounted on said elevator shaft means adjacent the center of the vertical wall of said cabin, beam means mounted to the exterior of said vertical wall in the plane of said screw and provided with an opening through which the screw passes, a nut fixed on said beam means and threadedly engaging said screw, and a motor rigidly fixed relative to said nut and operatively connected to drive said nut up and down said screw.
  • This invention relates to a lift or elevator, which comprises a nut which is axially fixed to the car and movable up and down along an axially stationary screw, and an electric motor for driving the nut or screw.
  • a lift or elevator which is suitable for "ice relatively low residential buildings as it can be installed along a wall and comprises a frame which can be made from prefabricated elements.
  • a longitudinal wall of the car is provided on its outside, preferably along its center line, with a crossbeam, to which the nut is secured, and the car is guided by rollers on laterally disposed tracks, which are preferably connected to the wall of the shaft for the lift or elevator.
  • the car of the lift or elevator according to the invention can be moved up and down like a motor-driven, wheeled car. All parts which may require servicing may be secured to the cross-beam, which extends preferably along the center line of a longitudinal wall of the car.
  • the area required for the driving and power transmitting means is approximately as large as the useful area of the car.
  • the space required for the cross-beam and the elements secured to it is only a fraction of the useful area of the car.
  • the elements which are carried by the cross-beam are accessible through a door from the interior of the car so that the servicing is facilitated.
  • a handwheel is carried by the nut or by the shaft or driving pulley of the motor, which is mounted on the cross-beam.
  • the passenger can lower the car with the aid of the handwheel even when the motor is inoperative.
  • the lift or elevator according to the invention is particularly suitable for residential buildings having two or three floors as well as for workshops in which loads must be lifted to a height of about 6 or 8 meters.
  • the screw is suspended at its top end from a fixed mounting and is inserted at its lower end with freedom of axial movement in a. sleeve so that the thermal expansion of the screw will not be obstructed.
  • FIG. 1 is an elevation showing a lift or elevator according to the invention
  • FIG. 2 is a fragmentary longitudinal sectional view taken on line IIII of FIG. 3 and shows the driving means
  • FIG. 3 is a horizontal sectional view taken on line IIII of FIG. 2 and showing the driving means
  • FIG. 4 is a perspective view showing the mounting of the upper and lower ends of the screw
  • FIG. 5 is a transverse sectional view which is associated with FIG. 4 and shows also the car;
  • FIG. 6 shows the wheeled car of the lift or elevator
  • FIG. 7 is a transverse sectional view taken through the cross-beam 6 in FIG. 6;
  • FIG. 8 shows the suspension means for the screw and a safety contact
  • FIG. 9 shows a modification of FIG. 8 with a spring suspension and a bridging contact
  • FIG. 10 is a longitudinal sectional view taken through the nut
  • FIG. 11 is a diagrammatic sectional view showing the interengaging parts of the nut and screw.
  • FIG. 12 shows the braking device
  • a car 1 of a lift or elevator comprises a floor 2, vertical longitudinal walls 3 and a top 4.
  • One of the vertical longitudinal walls 3 of the car 1 is provided with two vertical channels 5, the flanges of which are directed toward each other (see FIG. 3).
  • the channels 5 are interconnected by two horizontal channels 6.
  • One of the latter channels is secured to the inside of that flange of each channel 5 which faces the car.
  • the other channel 6 is secured to the outside of the other flange of each of the channels 5.
  • the tWo channels 6 form a cross-beam, to which a plate 7 is secured, which has a central, circular opening.
  • a stationary screw 8 extends, e.g., vertically through the opening in the plate 7. In Workshops having no space restrictions, the screw might be movable.
  • the upper end of the screw 8 is suspended from a stationary mounting. This is shown in FIG. 4.
  • the lower end of the screw 8 is inserted with an axial clearance in a stationary sleeve 23. Owing to this suspension, any thermal expansion of the screw in operation will not be obstructed.
  • the car 1 is vertically movable along the screw 8.
  • a nut 9 is secured to the plate 7 and movable along the screw 8.
  • the driving nut 9 is connected to the plate 7 by anti-friction bearings.
  • a simple ball bearing 10 is provided adjacent to the plate 7, and a self-aligning ball bearing 11 is provided adjacent to the nut 9.
  • the driving nut 9 is driven from an electric motor 12 by a V-belt 13 to move along the screw 8.
  • the drive motor 12 is a brake motor, which is secured by a beam 14 to the outside of one of the vertical longitudinal walls 3 of the car 1 so that this motor does not require additional space below the car when the same is in its lower end position. With the described arrangement, the motor is accessible from the interior of the car.
  • V-belts 13 are guided in grooves of a drive pulley 15, which is wedged to the shaft 16 of the motor 12, and in grooves formed in the cylindrical peripheral surface of the driving nut 9.
  • the transmission of power by V-belts has the advantage that a blockage of any of the elements for driving the lift or elevator will not result in a sudden seizing of the transmitting systems as the V-belts can slip in the grooves.
  • the rotor of the drive motor 12 can be manually operated by means of a handwheel 17, which is keyed to the shaft 16, so that the driving pulley and the driving nut 9 can also be rotated.
  • the operation of the handwheel enables a lowering of the entire car 1 and the motor 12 to the lower end position.
  • the lift or elevator according to the invention is much superior to the known lifts or elevators, in which a stoppage of the car occupied by passengers between two floors cannot be reliably avoided.
  • the rotation of the driving nut 9 is transmitted to a locknut 18, which is threaded to the screw 8 below the nut 9.
  • the locknut 18 is connected to the driving nut 9 by a driving pin 19 so that the locknut moves up and down along the screw 8 in unison with the driving nut 9.
  • a driving pin 19 whereas only one driving pin 19 is shown in FIG. 1, there are a plurality of driving pins, which are parallel to the screw 8.
  • the locknut 18 rotates normally with the driving nut 9 under no load. When the driving nut 9 has become Worn to such an extent that it is no longer selflocking, the locknut 18 takes up the function of the driving nut and prevents the car 1 from descending along the screw 8 merely under the action of gravity.
  • the threads of the driving nut 9, the locknut 18 and the screw 8 are self-locking. These threads have relative to the normal on their common longitudinal aXis an angle of lead which is preferably 6 or less.
  • the car 1 is moved up and down in the shaft for the lift or elevator in usual manner and is provided for this purpose near its top and bottom with rollers 20, 21, as is readily apparent from FIGS. 1 to 3, particularly from FIG. 1. These rollers serve to guide the car 1 along the flanges and in the interior of channel-shaped tracks.
  • the screw 8 is stationary and the driving nut 9 and the locknut 18 are movable.
  • the screw may be driven by a drive motor about its stationary longitudinal axis so that the nuts are displaced along the screw but do not rotate.
  • a single screw and a single driving nut may be sufiicient for moving up and down the car. This is a special advantage of the lift or elevator according to the invention.
  • the design according to the invention may also comprise a plurality of screws and associated driving screws.
  • FIG. 8 shows an overload-preventing safety device for the lift or elevator according to the invention.
  • a pivoted channel is designated 42a and a fixed channel is designated 42b.
  • the channels 42a and 4212 are connected by a connecting pin 24, which constitutes a pivot under certain operating conditions. Both channels are also provided with a pressure pin 28 and a limiting stop nut 29.
  • the pivoted channel 42a carries a bracket arm 25, in which the screw 8 is mounted with the aid of preferably conical insulators not shown), which serve to reduce the noise.
  • the screw 8 is locked with the aid of a castle nut 27.
  • a microswitch 30 is secured to the pivoted channel 42a and a switchactuating pin 31 is secured to the fixed channel 42b.
  • FIG. 10 shows a modification of the bearing arrangement for controlling the engagement between the screw 8 and the nut 9.
  • Two bearings 33, 34 are accommodated in a bearing chamber 32 and may alternatively consist of inclined conical roller bearings. This design has the advantage that the bearings are enclosed within a housing so that they are protected from being soiled.
  • FIG. ll shows that the screw threads 35 of the screw 8 and the mating screw threads 36 of the nut are designed so that the meshing portion of the nut 9 is much larger in section than the meshing portion of the screw 8.
  • the two meshing portions to be compared have different hatchings. This feature contributes to the safety.
  • the screw with a typical diameter of 70 mm. is highly overdimensioned in view of its load, which is small owing to the relatively low speed of travel at the angle of lead which has been stated, the described feature further reduces the pressure transmitted per unit of area between the screw and the nut.
  • FIG. 12 shows a lift or elevator according to the invention in an embodiment which can be operated without a brake motor so that its cost can be further reduced.
  • the electromagnetically operable brake which is used in this embodiment for the nut 9 consists of a braking strap 37, which is secured at one end and slung around a drum portion 38 of the nut 9.
  • the free end 39 of the braking strap 37 is adapted to be attracted by means of a solenoid 40.
  • the braking direction is indicated by the arrow 41.
  • a brake acting in one direction is suflicient because only the descent of the nut must be frictionally braked.
  • FIG. 9 shows for the screw 8 a suspension which is simpler and comprises a bridging contact.
  • a strong spring is simply inserted between the retaining arm 25' and the castle nut 27. This spring is designed to maintain the contact closed unless the load on the lift exceeds a predetermined value. A higher load will compress the spring so that the bridging contact is opened and the lift or elevator is stopped.
  • the car 1 of the lift or elevator is provided near its upper and lower end with guide rollers 20, 21, which are at right 5 angles to each other. This arrangement prevents the occurrence of a canting moment at the car 1 under the action of the load.
  • the invention is applicable to other apparatus for transporting passengers or freight in a vertical or inclined direction.
  • An elevator comprising elevator shaft means defining a vertical elevator shaft, a cabin including a vertical wall positioned to move up and down said elevator shaft, a plurality of guide rails fixed vertically on said elevator shaft means, guide rollers arranged perpendicularly fixed to said cabin and riding on said guide rails, a screw vertically mounted on said elevator shaft means adjacent the center of the vertical wall of said cabin, a first vertical channel rigidly afiixed to one extremity of said vertical wall, a second vertical channel rigidly afiixed to the other extremity of said vertical wall, a first horizontal channel in juxtaposition to said vertical wall and rigidly aifixed to said first vertical channel at its one end and to said second vertical channel at its other end, a second horizontal channel remote from said vertical wall and rigidly afiixed to said first vertical channel at its one end and to said second vertical channel at its other end, said horizontal channels forming beam means mounted to the exterior of said vertical wall in the plane of said screw and provided with an opening through which the screw passes,
  • Elevator according to claim 1 wherein said motor is mounted to the exterior of said Wall laterally displaced from said nut.
  • Elevator according to claim 1 further provided with a handwheel drivingly connected to manually operate said nut and means to obtain convenient access to said handwheel from the cabin interior.
  • Elevator according to claim 1 wherein said screw 4 is suspended at its upper end from a fixed support and has its lower end received in a sleeve with freedom of axial movement.
  • Elevator according to claim 1 wherein the upper end of said screw is fastened to a holding arm which upon overload of the cabin is swung about a connecting pin to actuate a safety contact.
  • Elevator according to claim 1 further including electromagnetically actuatable brake means cooperating with said nut, said nut including a portion formed as a drum, and said brake means including a unilaterally fastened brake band wrapped around said drum with its free end attached to a spring acting in opposition to an electromagnet.
  • An elevator comprising elevator shaft means defining a vertical elevator shaft, a cabin including at least one vertical wall positioned to move up and down said elevator shaft, a plurality of guide rails fixed vertically on said elevator shaft means, guide rollers arranged perpendicularly fixed to said cabin and riding on said guide rails, a screw vertically mounted on said elevator shaft means adjacent the center of the vertical wall of said cabin, the upper end of said screw being fastened to a holding arm which upon overloading of the cabin is swung about a connecting pin to actuate a safety contact, beam means mounted to the exterior of said vertical wall in the plane of said screw and provided with an opening through which the screw passes, a nut fixed on said beam means and threadedly engaging said screw, and a motor rigidly fixed relative to said nut and operatively connected to drive said nut up and down said screw.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Structural Engineering (AREA)
  • Types And Forms Of Lifts (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)
US599196A 1965-12-13 1966-12-05 Screw-driven elevator Expired - Lifetime US3468401A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE21477 1965-12-13

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US3468401A true US3468401A (en) 1969-09-23

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AT (1) AT278287B (cs)
DE (1) DE1456372A1 (cs)
ES (1) ES334439A1 (cs)
GB (1) GB1142520A (cs)
IL (1) IL27055A (cs)
NL (1) NL6616929A (cs)

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US3574286A (en) * 1968-01-24 1971-04-13 Nasa Material handling device
US3665782A (en) * 1970-09-04 1972-05-30 Superior Electric Co Nut support to accomodate misalignment
US3687234A (en) * 1969-12-08 1972-08-29 Fogautolube Sa Load lifting mechanism
US3686728A (en) * 1970-08-10 1972-08-29 Joseph William Fried Metal cutting tool
US3792894A (en) * 1972-05-17 1974-02-19 Aeroquip Corp Self-storing vehicle deck
US3833092A (en) * 1973-04-04 1974-09-03 Flinchbaugh Murray Corp Transport mechanism for stairway elevator
US3881575A (en) * 1972-12-11 1975-05-06 Carlisle F Manaugh Vertical transportation and elevator system
US3945469A (en) * 1974-01-04 1976-03-23 Dorcich Roy L Escape elevator
US3954157A (en) * 1974-08-16 1976-05-04 Dover Corporation Elevator lifting frame
US4005785A (en) * 1975-08-11 1977-02-01 Manaugh Carlisle F Elevator mechanism for multiple level mechanical car parking structure
US4019616A (en) * 1976-06-24 1977-04-26 International Business Machines Corporation Linear motion drive apparatus for a printer carriage
EP0020825A1 (en) * 1979-06-11 1981-01-07 Sanscord Australia Pty. Limited Apparatus for the transfer of loads from one level to another
US4493602A (en) * 1981-07-30 1985-01-15 Koerber Charles F Wheelchair lift apparatus
US4568132A (en) * 1984-12-19 1986-02-04 Weber-Knapp Company Motorized lift mechanism
US4747320A (en) * 1985-12-18 1988-05-31 Skf Nova Ab Screw and nut drive with rotation lock
US4768621A (en) * 1985-08-16 1988-09-06 Mitsubishi Denki Kabushiki Kaisha Elevator system
US5111925A (en) * 1989-12-22 1992-05-12 Somfy Device for automatically halting an electric motor after a certain number of revolutions
US5368430A (en) * 1993-07-21 1994-11-29 Lin; Pei-Chang Parking device
US5526903A (en) * 1994-08-30 1996-06-18 The University Of Chicago Low profile, high load vertical rolling positioning stage
US5901812A (en) * 1997-04-17 1999-05-11 Trus T! Lift Corp. Lift for disabled persons
US6234034B1 (en) * 1998-09-18 2001-05-22 Tsubakimoto Chain Co. Linear actuator with drop prevention mechanism
US6557431B2 (en) * 2001-02-02 2003-05-06 Siemens Medical Solutions Usa, Inc. Fail-safe ball screw
US20040206574A1 (en) * 2002-09-26 2004-10-21 Richey William H. Load lowering system
DE102004053386A1 (de) * 2004-11-02 2006-05-18 Hetek Baumann Hebetechnik Gmbh Maschine mit Einsäulenführung zum Heben und/oder Fortbewegen von Personen, insbesondere von Menschen mit eingeschränkter Beweglichkeit
US20060137185A1 (en) * 2003-02-25 2006-06-29 Wieslaw Bober Frame for mounting a lift device for a video display in an article of furniture
US20060150556A1 (en) * 2005-01-13 2006-07-13 Powell David W Method and apparatus for precision slip-forming of complex precast shapes
US20070246304A1 (en) * 2006-01-31 2007-10-25 Kuo Chang H Suspension mechanism of screw shaft
US7383922B1 (en) * 2004-04-01 2008-06-10 Richey William H Load stopping system
US20080135356A1 (en) * 2006-12-06 2008-06-12 Yungh-Siang Lin Transmission motor structure
US7396202B1 (en) * 2003-06-03 2008-07-08 Cook Technologies, Inc. Lift and carrier assembly for a personal-transportation vehicle
US20110155509A1 (en) * 2009-12-29 2011-06-30 Wu-Teng Hsieh Double Screw Elevator
CN104528501A (zh) * 2014-12-23 2015-04-22 义乌市开晶进出口有限公司 一种通过风扇散热的建筑物料提升装置
CN104843561A (zh) * 2015-04-27 2015-08-19 胡国良 丝杠电梯
CN104860158A (zh) * 2015-04-27 2015-08-26 胡国良 丝杠电梯
CN104876091A (zh) * 2015-04-27 2015-09-02 胡国良 丝杠电梯
CN105084167A (zh) * 2015-06-30 2015-11-25 胡国良 无机房内置式丝杠电梯
US9260274B2 (en) 2009-11-06 2016-02-16 Aloys Wobben Lift for a wind power installation
US9457988B1 (en) 2009-04-24 2016-10-04 Federal Equipment Company Elevator structure and brake system therefor
CN106715306A (zh) * 2014-09-30 2017-05-24 因温特奥股份公司 具有被分别驱动的轿厢和闭合的行驶轨道的电梯系统
US20170343086A1 (en) * 2014-07-29 2017-11-30 Raytheon Company Relative Translation Assembly
US9856111B1 (en) * 2009-04-24 2018-01-02 Paul Anderson Elevator structure and brake system therefor
US10040539B2 (en) * 2014-01-20 2018-08-07 Safran Electronics And Defense Actuator for controlling a horizontal stabilizer of an aircraft
CN109384126A (zh) * 2018-12-28 2019-02-26 攀枝花攀钢集团设计研究院有限公司 电梯
WO2021171059A1 (en) * 2020-02-25 2021-09-02 Mohammadi Masoud Column lift mechanism using rotating screw

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GB2160175A (en) * 1984-06-15 1985-12-18 Chown Peter A C Wheelchair lift
US4644811A (en) * 1985-06-19 1987-02-24 The United States Of America As Represented By The Secretary Of The Air Force Termination load carrying device
GB2335411A (en) * 1998-03-21 1999-09-22 Philip Brendan Middleton Helically driven elevator
DE19847763B4 (de) * 1998-10-16 2005-03-24 Hirt, Hans-Jürgen Behindertenaufzug
DE10021884A1 (de) * 2000-05-05 2001-11-08 Frank Thielow Aufzug mit einer Hohlspindel
DE102005055639A1 (de) * 2005-11-22 2007-05-31 Hiwin Technologies Corp. Rollenspindelgetriebe für einen Aufzug
DE102006034834A1 (de) * 2006-07-27 2008-01-31 Hiwin Technologies Corp. Wellenantrieb für Aufzug
CN103420259B (zh) * 2012-05-23 2015-09-09 上银科技股份有限公司 螺杆升降结构
CN104828677A (zh) * 2015-04-29 2015-08-12 汪涛 运行稳固的电力铁塔维护用设备及其使用方法
CN104828675A (zh) * 2015-04-29 2015-08-12 毛玲波 具有限位功能的电力铁塔维护用设备及其使用方法

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US3215227A (en) * 1963-03-04 1965-11-02 Ellamac Inc Elevator drives
US3308674A (en) * 1965-01-27 1967-03-14 Arthur M Maroth Radial roller anti-friction transmission

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US789003A (en) * 1904-09-03 1905-05-02 Joseph Casho Elevator.
US2004060A (en) * 1934-05-24 1935-06-04 Warner Elevator Mfg Company Residence elevator
US2187390A (en) * 1938-03-30 1940-01-16 Reliance Elevator Mfg Company Safety and indicating mechanism for elevators
US2527897A (en) * 1945-11-15 1950-10-31 Todd Earl Single column elevator device
US3215227A (en) * 1963-03-04 1965-11-02 Ellamac Inc Elevator drives
US3308674A (en) * 1965-01-27 1967-03-14 Arthur M Maroth Radial roller anti-friction transmission

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3574286A (en) * 1968-01-24 1971-04-13 Nasa Material handling device
US3687234A (en) * 1969-12-08 1972-08-29 Fogautolube Sa Load lifting mechanism
US3686728A (en) * 1970-08-10 1972-08-29 Joseph William Fried Metal cutting tool
US3665782A (en) * 1970-09-04 1972-05-30 Superior Electric Co Nut support to accomodate misalignment
US3792894A (en) * 1972-05-17 1974-02-19 Aeroquip Corp Self-storing vehicle deck
US3881575A (en) * 1972-12-11 1975-05-06 Carlisle F Manaugh Vertical transportation and elevator system
US3833092A (en) * 1973-04-04 1974-09-03 Flinchbaugh Murray Corp Transport mechanism for stairway elevator
US3945469A (en) * 1974-01-04 1976-03-23 Dorcich Roy L Escape elevator
US3954157A (en) * 1974-08-16 1976-05-04 Dover Corporation Elevator lifting frame
US4005785A (en) * 1975-08-11 1977-02-01 Manaugh Carlisle F Elevator mechanism for multiple level mechanical car parking structure
US4019616A (en) * 1976-06-24 1977-04-26 International Business Machines Corporation Linear motion drive apparatus for a printer carriage
EP0020825A1 (en) * 1979-06-11 1981-01-07 Sanscord Australia Pty. Limited Apparatus for the transfer of loads from one level to another
US4493602A (en) * 1981-07-30 1985-01-15 Koerber Charles F Wheelchair lift apparatus
US4568132A (en) * 1984-12-19 1986-02-04 Weber-Knapp Company Motorized lift mechanism
US4768621A (en) * 1985-08-16 1988-09-06 Mitsubishi Denki Kabushiki Kaisha Elevator system
US4747320A (en) * 1985-12-18 1988-05-31 Skf Nova Ab Screw and nut drive with rotation lock
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Also Published As

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GB1142520A (en) 1969-02-12
ES334439A1 (es) 1968-02-01
NL6616929A (cs) 1967-06-14
DE1456372A1 (de) 1969-04-10
IL27055A (en) 1970-08-19
AT278287B (de) 1970-01-26

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