US3687234A - Load lifting mechanism - Google Patents

Load lifting mechanism Download PDF

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Publication number
US3687234A
US3687234A US90758A US3687234DA US3687234A US 3687234 A US3687234 A US 3687234A US 90758 A US90758 A US 90758A US 3687234D A US3687234D A US 3687234DA US 3687234 A US3687234 A US 3687234A
Authority
US
United States
Prior art keywords
carrier
screw member
safety nut
screw
sleeve
Prior art date
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
Application number
US90758A
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English (en)
Inventor
Jacques C Gendreau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FOGAUTOLUBE SA
Original Assignee
FOGAUTOLUBE SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by FOGAUTOLUBE SA filed Critical FOGAUTOLUBE SA
Application granted granted Critical
Publication of US3687234A publication Critical patent/US3687234A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/02—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars
    • B66F7/025—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars screw operated
    • 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
    • Y10T74/18712—Contamination related

Definitions

  • a lifting mechanism employing vertical screws and U-S- Cl. carrier nut members move on the crews is dis- 254/103 closed.
  • the lift mechanism is characterized by means [51] Int. Cl. ..B66b 11/04 for readily checking the degree of wear of the threads [58] Field of Search ..187/24, 25, 8.41, 8.54; of the carrier members, the checking being facilitated 254/103; 74/424.8 by the provision of safety nuts which are linked to the carrier nuts and which .will assume the load bearing function upon failure of the carrier nuts.
  • the present invention relates to the raising and lowering of loads. More specifically, this invention is directed to lifts of the type comprising at least two rotating vertical screws. Accordingly, the general objects of the present invention are to provide novel and improved methods and apparatus of such character.
  • Screw type lifts have a major disadvantage.
  • This disadvantage resides in the fact that the threads of the carrier nuts for the vehicle supporting arms have to do a great deal of work and consequently become worn.
  • the wear of the carrier nut threads could not be checked until the carrier nuts had been removed; a process which required disassembly of the entire lift.
  • the degree of wear of the carrier nuts becomes too severe, resulting from the nuts being kept in use for too long a period, there is a risk that the nuts will no longer support the weight of the lifted vehicle and will slide on the vertical screws.
  • the present invention overcomes the above briefly discussed and other disadvantages of the prior art by providing a novel and improved screw type lift mechanism.
  • means are provided for preventing the load supporting arms from suddenly dropping under the weight of the load should the threads of the carrier nuts become excessively worn.
  • means are provided which enable the condition of the carrier nuts to be checked without dismantling of the lift.
  • the lift of the present invention comprises at least to vertical pillars or columns.
  • Each vertical column houses a rotating vertical screw, means for setting the screw in rotation about its axis and an internally threaded carrier nut which engages the threads on the screw.
  • each carrier nut is secured to an arm which is intended to be engaged under a vehicle or other load which is to be raised.
  • the present invention also includes, in each column or lifting mechanism, an internally threaded safety nut which cooperates with the screw.
  • Each lifting mechanism also includes a sleeve mounted on the screw and positioned between the carrier nut and safety nut, the sleeves being arranged to slide freely on the screw.
  • the invention also comprises means for linking the safety nut to the sleeve and the sleeve to the carrier nut; the linking mechanism providing for a predetermined amount of spacing or play between the carrier nut and sleeve.
  • the means for linking the safety nut to the sleeve and the sleeve to the carrier nut comprises a pair of parallel bars. These linking bars are rigidly mounted to the exterior of the sleeve and safety nut. Extensions of the bars are provided with longitudinal slots and are juxtapositioned to the exterior of the carrier nut. The bars are maintained in position relative to the carrier nut by screws which pass through the slots and engage the carrier nuts. In the course of assembly a space will be left between the top of the sleeve and the bottom of the carrier nut. A decrease in the amount of this sleeve-carrier nut spacing is an indication that the internal threads on the carrier nut have become worn and the nut should be replaced.
  • the screws passing through the longitudinal slots in the linking bars exert sufficient force so as to normally 0p pose any axial displacement of the sleeve with respect to the carrier nut.
  • this force is not sufficient to prevent the carrier nut from sliding relative to the linking bars should the threads of the carrier nuts become worn.
  • An additional feature of the present invention is a construction which renders it impossible to continue to use the lifting mechanism should the threads of the carrier nut become worn; this safety feature becoming operative only after the load has been removed from the mechanism.
  • the safety nuts are disposed below the sleeves, which is themselves disposed below the carrier nuts, and the vertical screws on which these elements are mounted is provided with unthreaded portions of reduced diameter at their lower ends. Accordingly, when the arms intended to support the load are in their bottom position, the safety nuts will be completely disengaged from the thread of the vertical screws.
  • the carrier nuts will drop slightly and abut against the sleeves and the load will accordingly be transferred to the safety nuts. If the operator does not notice the fault he can nevertheless lower the load.
  • the safety nuts will become disengaged from the threads of the vertical screws and, since the worn threads of the carrier nuts will no longer be capable of engaging the vertical screws sufiiciently to permit raising a load, it will no longer be possible to employ the lift mechanism.
  • FIG. 1 is a side view of a vehicle lift employing the present invention
  • FIG. 2 is an enlarged, partial view of one of the lift mechanisms of the apparatus of FIG. 1;
  • FIG. 3 is an enlarged cross-sectional view of the mechanism of FIG. 2.
  • the vehicle lift illustrated in FIG. 1 comprises two vertical columns 1 and 2 which are supported at their lower ends from a frame 3; frame 3 being affixed to or embedded in the ground.
  • Each of columns 1 and 2 houses bearings, not shown, in which are joumaled the ends of respective vertical screws 4 (FIGS. 2 and 3).
  • the vertical screw 4 of column 1 has, at its upper end, a pinion which meshes with a corresponding pinion of a reduction gear driven by an electric motor 6 mounted at the top of the column.
  • the vertical screw 4 of column 2 is driven at the same speed as the screw of column 1 via a chain drive, not shown.
  • the vehicle lift of FIG. 1 is provided with two horizontal arms 7 which are capable of moving vertically along the columns 1 and 2, the arms 7 being shown as extending below a motor vehicle 8, in order to enable a load to be lifted for the purpose of giving axis to the various underside parts of theload which are to be checked and/or serviced.
  • Sleeve 10 is mounted on vertical screw 4 below carrier nut 9.
  • Sleeve 10 has an internal diameter which is slightly greater than the external diameter of screw 4 and thus the sleeve is able to slide freely on the screw.
  • a safety nut 11 is mounted on vertical screw 4 below sleeve 10. Nut 11 is internally threaded and engages screw 4.
  • each of safety nut 11, sleeve 10 and carrier nut 9 has two longitudinal grooves 12 and 13 which are oppositely disposed when the elements are in their proper installed position. Grooves 12 and 13 are intended to receive respective linking bars 14 and 15. Bar 14 has four longitudinally aligned smooth holes 16 and one slot 17. The holes 16 in bar 14 receive screws 18 which have threaded portions which engage corresponding threaded apertures in sleeve 10 and safety nut 11; the threaded apertures in the sleeve and safety nut being at the base of groove 12. Similarly, the base of the groove 13in sleeve 10 and safety nut 11 is provided with threaded apertures which are engaged by screws 19 which pass through aligned smooth holes 20 in bar 15. Through the combined locking action of the bars and screws, the sleeve 10 and safety nut 11 are permanently located relative to one another.
  • the base of groove 12 in carrier nut 9 is provided with two threaded holes 21. Holes 21 receive the threaded ends of screws 22; the screws 22 having an intermediate portion of enlarged diameter between the threaded end and head.
  • a spring washer 25 is installed on each of screws 22, the screws are passed through the slot 17 in bar 14 and the screw is tightened until the shoulder at the junction of the threaded and enlarged intermediate portions of the screw abuts the surface of carrier nut 9 in slot 17.
  • the bar 15 has a slot 26 whereby screws 28 are spring washers 29 may be installed.
  • the invention enables lifts of the type described to be made safe in a very simple and highly effective manner. It is also to be observed that the present invention avoids the possibility of leaving the lift mechanism locked in the elevated position as a result of a component .failure.
  • a load lifting mechanism comprising: at least a first screw member; means coupled to said first screw member for causing rotation of said screw member about its axis;
  • carrier means having a threaded portion which normally engages a threaded portion of said first screw member whereby rotation of said screw member will cause movement of said carrier means along a plane transverse to the axis of said screw member, said carrier means also including a load supporting portion;
  • safety nut means said safety nut means having a threaded portion which corresponds with the threaded portion of said first screw member;
  • linking means normally providing spacing between said sleeve means and said carrier means to retain a preset positioning of the carrier means relative to the safety nut means, said linking means including:
  • bar means oriented parallel to the axis of said screw member, said bur means being affixed to said sleeve and safety nut means, said bar means having an extension which overlies at least a portion of said carrier means, said bar means extension being characterized by a longitudinal slot;
  • a load lifting mechanism comprising: a first vertically oriented rotatable screw member; a second vertically oriented rotatable screw member spacially displaced from said first screw member; first carrier means having a threaded portion which normally engages a threaded portion of said first screw member, said first carrier means also including a load supporting portion;
  • second carrier means having a threaded portion which normally engages a threaded portion of said second screw member, said second carrier means also including a load supporting portion whereby rotation of said first and second screw members will cause vertical movement of a load extending between and supported by said first and second carrier means;
  • first and second safety nut means respectively having threaded portions which correspond with the threaded portions of said first and second screw members;
  • first and second sleeve means positioned about respective of said screw members between said.
  • each of said sleeve means being greater than the maximum outer diameter of its associated screw member
  • linking means for linking each said safety nut means to each pair carrier means, said linking means normally providing spacing between said sleeve means and said carrier means, said linking means including;
  • each of said bar means oriented parallel to the axis of each of said screw members, one of said bar means being affixed to each of said safety nut means, each of said bar means having an extension which overlies at least a portion of the carrier means on its associated screw member;
  • each of said screw members comprises:
  • a substantially vertically oriented member having an upper threaded portion and a lower unthreaded portion, said safety nut means being coaxial with said unthreaded portion when said lifting mechanism is in its lowest position.
  • a substantially vertically oriented member having an upper threaded portion and a lower unthreaded portion, said safety nut means being coaxial with said unthreaded portion when said lifting mechanism is in its lowest position.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Types And Forms Of Lifts (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Steering Devices For Bicycles And Motorcycles (AREA)
  • Tents Or Canopies (AREA)
  • Invalid Beds And Related Equipment (AREA)
US90758A 1969-12-08 1970-11-18 Load lifting mechanism Expired - Lifetime US3687234A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6942313A FR2070516A5 (de) 1969-12-08 1969-12-08

Publications (1)

Publication Number Publication Date
US3687234A true US3687234A (en) 1972-08-29

Family

ID=9044246

Family Applications (1)

Application Number Title Priority Date Filing Date
US90758A Expired - Lifetime US3687234A (en) 1969-12-08 1970-11-18 Load lifting mechanism

Country Status (5)

Country Link
US (1) US3687234A (de)
DE (1) DE2047019A1 (de)
FR (1) FR2070516A5 (de)
GB (1) GB1251490A (de)
NL (1) NL7013798A (de)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833092A (en) * 1973-04-04 1974-09-03 Flinchbaugh Murray Corp Transport mechanism for stairway elevator
US3958664A (en) * 1974-10-25 1976-05-25 Maxon Industries, Inc. Fail safe mechanism for automatically de-energizing a multi-post vehicle hoist
US4102435A (en) * 1974-02-22 1978-07-25 Gebr. Hofmann Kg Mechanical safety unit on spindle-driven lifts
US4173268A (en) * 1976-10-29 1979-11-06 Hans Nussbaum Hoist mechanism
US4279329A (en) * 1979-02-17 1981-07-21 Gebr. Hofmann GmbH, KG Machinenfabrik Safety device for lift equipment
US4319738A (en) * 1979-03-08 1982-03-16 Otto Nussbaum G.M.B.H. & Co. Kg, Fertigungstechnik Und Maschinenbau Lifting mechanisms especially lifting platform
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
US4887774A (en) * 1988-08-08 1989-12-19 Eddie Phillips Safety nut assembly for backstand apparatus
US4919236A (en) * 1985-05-31 1990-04-24 Ntd Hiss Nartransportdon Ab Screw lift
US5318154A (en) * 1992-06-16 1994-06-07 Hellman Jr Robert R Column for load lifting devices
US5702222A (en) * 1996-08-14 1997-12-30 Park Plus Corporation Electrically driven car lift apparatus for home use
US5755310A (en) * 1996-09-17 1998-05-26 Joyce/Dayton Corporation Ratchet lifting nut assembly
US5937972A (en) * 1996-08-20 1999-08-17 Lohr Industrie Support stanchion with integrated raising mechanism and upper structure comprising at least one pair of functionally interconnected stanchions
US6234034B1 (en) * 1998-09-18 2001-05-22 Tsubakimoto Chain Co. Linear actuator with drop prevention mechanism
US6279685B1 (en) * 1998-05-28 2001-08-28 Hydra-Lift Industries Ltd. Lifting apparatus
US6557431B2 (en) * 2001-02-02 2003-05-06 Siemens Medical Solutions Usa, Inc. Fail-safe ball screw
EP1340958A2 (de) * 2002-03-01 2003-09-03 TRW Systemes Aeronautiques Civils Vorrichtung zur Messung der Abnutzung einer Schraube in einer Mutter- und Schraubenanordnung
US6814342B1 (en) * 2002-11-01 2004-11-09 Mohawk Resources Ltd. Pad adapters for vehicle lifts and methods employing same
US20040247423A1 (en) * 2003-05-19 2004-12-09 James Thiel Multi-lift for lifting and storing motorcycles and other vehicles
US20070278465A1 (en) * 2006-05-30 2007-12-06 Sefac Societe Anonyme Hoisting device with a catch nut
US20120193590A1 (en) * 2010-10-05 2012-08-02 Horwath William A Lifting bracket assembly including jack screw connector
US20180236949A1 (en) * 2017-02-21 2018-08-23 Randy Whitehurst Portable tool mounting device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9001900A (nl) * 1990-08-29 1992-03-16 Stertil Bv Drager voor een auto-hefbrug.
CN103551863B (zh) * 2013-10-31 2017-01-04 无锡华联精工机械有限公司 移动滚轮架丝母安全防滑结构
CN109775611B (zh) * 2017-11-01 2020-07-03 霍邱县建华米业有限责任公司 一种农业谷物处理用提升上料装置
US11498817B2 (en) * 2019-07-02 2022-11-15 Nabholz Construction Corporation Nut gap monitoring system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2593635A (en) * 1946-07-24 1952-04-22 Globe Hoist Co Method and mechanism for raising vehicles
US3179963A (en) * 1963-10-04 1965-04-27 Kenneth Peterson Company Buoyant swimming vest
US3309060A (en) * 1965-07-22 1967-03-14 Villars Julio Lift for motor vehicles
US3468401A (en) * 1965-12-13 1969-09-23 Letz Aufzug Ets Screw-driven elevator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2593635A (en) * 1946-07-24 1952-04-22 Globe Hoist Co Method and mechanism for raising vehicles
US3179963A (en) * 1963-10-04 1965-04-27 Kenneth Peterson Company Buoyant swimming vest
US3309060A (en) * 1965-07-22 1967-03-14 Villars Julio Lift for motor vehicles
US3468401A (en) * 1965-12-13 1969-09-23 Letz Aufzug Ets Screw-driven elevator

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833092A (en) * 1973-04-04 1974-09-03 Flinchbaugh Murray Corp Transport mechanism for stairway elevator
US4102435A (en) * 1974-02-22 1978-07-25 Gebr. Hofmann Kg Mechanical safety unit on spindle-driven lifts
US3958664A (en) * 1974-10-25 1976-05-25 Maxon Industries, Inc. Fail safe mechanism for automatically de-energizing a multi-post vehicle hoist
US4173268A (en) * 1976-10-29 1979-11-06 Hans Nussbaum Hoist mechanism
US4279329A (en) * 1979-02-17 1981-07-21 Gebr. Hofmann GmbH, KG Machinenfabrik Safety device for lift equipment
US4319738A (en) * 1979-03-08 1982-03-16 Otto Nussbaum G.M.B.H. & Co. Kg, Fertigungstechnik Und Maschinenbau Lifting mechanisms especially lifting platform
US4919236A (en) * 1985-05-31 1990-04-24 Ntd Hiss Nartransportdon Ab Screw 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
US4887774A (en) * 1988-08-08 1989-12-19 Eddie Phillips Safety nut assembly for backstand apparatus
US5318154A (en) * 1992-06-16 1994-06-07 Hellman Jr Robert R Column for load lifting devices
US5702222A (en) * 1996-08-14 1997-12-30 Park Plus Corporation Electrically driven car lift apparatus for home use
US5937972A (en) * 1996-08-20 1999-08-17 Lohr Industrie Support stanchion with integrated raising mechanism and upper structure comprising at least one pair of functionally interconnected stanchions
US5755310A (en) * 1996-09-17 1998-05-26 Joyce/Dayton Corporation Ratchet lifting nut assembly
US6279685B1 (en) * 1998-05-28 2001-08-28 Hydra-Lift Industries Ltd. Lifting apparatus
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
EP1340958A3 (de) * 2002-03-01 2004-08-25 Goodrich Control Systems Vorrichtung zur Messung der Abnutzung einer Schraube in einer Mutter- und Schraubenanordnung
FR2836718A1 (fr) * 2002-03-01 2003-09-05 Trw Sys Aeronautiques Civil Dispositif de detection d'usure de l'ecrou d'un ensemble vis-ecrou
EP1340958A2 (de) * 2002-03-01 2003-09-03 TRW Systemes Aeronautiques Civils Vorrichtung zur Messung der Abnutzung einer Schraube in einer Mutter- und Schraubenanordnung
US6814342B1 (en) * 2002-11-01 2004-11-09 Mohawk Resources Ltd. Pad adapters for vehicle lifts and methods employing same
US20040247423A1 (en) * 2003-05-19 2004-12-09 James Thiel Multi-lift for lifting and storing motorcycles and other vehicles
US20070278465A1 (en) * 2006-05-30 2007-12-06 Sefac Societe Anonyme Hoisting device with a catch nut
US20120193590A1 (en) * 2010-10-05 2012-08-02 Horwath William A Lifting bracket assembly including jack screw connector
US8807532B2 (en) * 2010-10-05 2014-08-19 Whiting Corporation Lifting bracket assembly including jack screw connector
US20180236949A1 (en) * 2017-02-21 2018-08-23 Randy Whitehurst Portable tool mounting device

Also Published As

Publication number Publication date
NL7013798A (de) 1971-06-10
DE2047019A1 (de) 1971-06-09
FR2070516A5 (de) 1971-09-10
GB1251490A (de) 1971-10-27

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