GB960358A - Screw jack - Google Patents

Screw jack

Info

Publication number
GB960358A
GB960358A GB10274/63A GB1027463A GB960358A GB 960358 A GB960358 A GB 960358A GB 10274/63 A GB10274/63 A GB 10274/63A GB 1027463 A GB1027463 A GB 1027463A GB 960358 A GB960358 A GB 960358A
Authority
GB
United Kingdom
Prior art keywords
jack
nut
drive nut
screw
auxiliary
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
Application number
GB10274/63A
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.)
Joyce Cridland Co
Original Assignee
Joyce Cridland Co
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 Joyce Cridland Co filed Critical Joyce Cridland Co
Publication of GB960358A publication Critical patent/GB960358A/en
Expired legal-status Critical Current

Links

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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
    • B66F3/18—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated actuated through worm gearings
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

960,358. Screw jacks. JOYCE-CRIDLAND CO. March 15, 1963 [March 23, 1962], No. 10274/63. Heading B8J. A screw jack including a drive nut meshing with a jack screw is provided with means for indicating wear of the drive nut and provision is made for supporting a load safely when operation of the jack is impossible due to wear. Fig. 2 shows a jack when first assembled, the indicator means comprising an auxiliary nut 42 engaging a jack screw 16 and spaced above a drive nut 14. The top surface of the auxiliary nut 42 projects a slight distance above the top of a cap 18 and indicates that the drive nut 14 is unworn. The two nuts are connected by a ring 44 having tongues 50 which project into a pair of slots provided in the hub portion 28 of the drive nut. Pins 46 project through aligned apertures in the ring and the auxiliary nut. Accordingly there is substantially no relative rotation between the nuts. As the threads of the drive nut become worn, the jack screw 16 lowers carrying the auxiliary nut 42 with it. Fig. 3 shows the relative positions of the parts after prolonged use, the top of auxiliary nut 42 being coplanar with the housing cap 18 and indicating to a user that further operation of the jack is undesirable without replacement of the drive nut 14. The tongues 50 of the ring 44 have moved further into the slots in the drive nut. In Fig. 4 the threads of the drive nut have become so worn as to be incapable of supporting the screw 16. The auxiliary nut has dropped further and rests on the drive nut. Thereafter, if the auxiliary nut is rotated in an effort to rotate the jack screw, the pins 46 are sheared and operation of the jack is impossible although the jack screw and the load are safely supported.
GB10274/63A 1962-03-23 1963-03-15 Screw jack Expired GB960358A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US181874A US3176963A (en) 1962-03-23 1962-03-23 Safety jack with auxiliary safety nut

Publications (1)

Publication Number Publication Date
GB960358A true GB960358A (en) 1964-06-10

Family

ID=22666167

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10274/63A Expired GB960358A (en) 1962-03-23 1963-03-15 Screw jack

Country Status (5)

Country Link
US (1) US3176963A (en)
CH (1) CH406569A (en)
DE (1) DE1194547B (en)
FR (1) FR1352383A (en)
GB (1) GB960358A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3323777A (en) * 1964-10-28 1967-06-06 Duff Norton Co Anti-backlash worm gear jack

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1294132B (en) * 1964-04-15 1969-04-30 Demag Ag Securing device against tearing out the thread of an axially held spindle nut
CH437700A (en) * 1965-07-22 1967-06-15 Villars Julio Car lift
DE1550657B2 (en) * 1966-02-03 1971-06-09 Blohm, Robert, 2000 Hamburg Berge dorf GEAR WITH A VERTICALLY SCREW-MOVABLE THREADED SPINDLE
US3485110A (en) * 1968-08-21 1969-12-23 Duff Norton Co Nut and screw mechanism
US3857547A (en) * 1974-03-18 1974-12-31 Templeton Kenly & Co Automatically compensating jack construction
US3927863A (en) * 1974-09-03 1975-12-23 George Polsky Transportable jack
EP0021623B1 (en) * 1979-05-31 1987-03-04 Fortune Engineering Limited Worm screw jack apparatus and method of making same
DE3036940A1 (en) * 1980-09-30 1982-05-13 Siemens AG, 1000 Berlin und 8000 München SCREW NUT TRANSMISSION FOR VERTICAL SHIFTING OF A LOAD
DE19503299C2 (en) * 1995-02-02 2000-07-13 Peri Gmbh Gear for moving a load up and down
US6158720A (en) * 1998-08-03 2000-12-12 Joyce/Dayton Corporation Anti-backlash nut assembly
JP3349098B2 (en) * 1998-09-18 2002-11-20 株式会社椿本チエイン Linear actuator with drop prevention mechanism
GB0126510D0 (en) * 2001-11-05 2002-01-02 Lucas Industries Ltd Screw actuator
AT413877B (en) * 2004-07-23 2006-06-15 Juergen Zimmermann PARKING FACILITY
JP5701870B2 (en) * 2009-07-15 2015-04-15 サノフィ−アベンティス・ドイチュラント・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング Thrust bearing assembly, drive train, and drug delivery device
CA2934319C (en) * 2014-01-22 2020-03-24 William T. Long Method and apparatus for raising a structure
DE102018106788A1 (en) * 2018-03-22 2019-09-26 Dewertokin Gmbh Electromotive furniture drive with a gear arrangement with intermediate shaft

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US786353A (en) * 1897-06-19 1905-04-04 Brown & Sharpe Mfg Screw-machine.
GB652199A (en) * 1948-12-23 1951-04-18 Mb Wild & Co Ltd Improvements relating to screw-jack and like mechanisms
DE956804C (en) * 1954-07-07 1957-01-24 Anton Schroeder Safety gear for lifting devices with spindle drive, in particular lifting platform
FR1219474A (en) * 1958-03-25 1960-05-18 Zd Y V I Safety device indicating the maximum force to be exerted on a machine bolt subjected to tension

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3323777A (en) * 1964-10-28 1967-06-06 Duff Norton Co Anti-backlash worm gear jack
DE1258573B (en) * 1964-10-28 1968-01-11 Duff Norton Co Screw drive

Also Published As

Publication number Publication date
US3176963A (en) 1965-04-06
DE1194547B (en) 1965-06-10
FR1352383A (en) 1964-02-14
CH406569A (en) 1966-01-31

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