EP0014070A1 - Schraubenwinde - Google Patents

Schraubenwinde Download PDF

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Publication number
EP0014070A1
EP0014070A1 EP80300151A EP80300151A EP0014070A1 EP 0014070 A1 EP0014070 A1 EP 0014070A1 EP 80300151 A EP80300151 A EP 80300151A EP 80300151 A EP80300151 A EP 80300151A EP 0014070 A1 EP0014070 A1 EP 0014070A1
Authority
EP
European Patent Office
Prior art keywords
screw
worm
worm wheel
rotating
jack
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.)
Withdrawn
Application number
EP80300151A
Other languages
English (en)
French (fr)
Inventor
Alan Fortune
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.)
FORTUNE ENGINEERING Ltd
Original Assignee
FORTUNE ENGINEERING Ltd
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 FORTUNE ENGINEERING Ltd filed Critical FORTUNE ENGINEERING Ltd
Publication of EP0014070A1 publication Critical patent/EP0014070A1/de
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • This invention relates to screw-jacks and more particularly to rotating worm screw jacks.
  • a known rotating worm screw jack shown partially sectioned in Fig. 1 of the accompanying drawings, includes a housing 1 in which is a worm 2 mounted on a shaft 3, the shaft 3 being supported within the housing 1 by bearings (not shown).
  • the worm 2 engages concave external worm threads of a worm wheel 4 which is supported between upper and lower thrust bearings 5, 6 respectively comprising ball elements caged in any suitable manner.
  • the thrust bearings 5 and 6 are restrained within annular recesses in a housing cap 7 and a base portion 8 of the housing 1 respectively, the housing cap 7 being threadably engaged with an opening in the top of the housing 1.
  • a screw 9 Extending perpendicularly to both the axis of the worm 2 and the worm wheel 4 is a screw 9 to which the worm wheel is keyed by a square sectioned key 10 having a longitudinal axis extending parallel to the longitudinal axis of the screw 9.
  • the screw 9 has screw threaded portions 11 and 12 at the extremities thereof, the remaining portions of the screw 9 being plane.
  • a section of the screw 9 between the threaded portions 11 and 12 and above (as viewed in Fig. 1) the key 10 is a plane section 13 having a diameter which is larger than the major diameter of the screw threaded portion 11 and which is mounted on an upper shoulder 14 of the worm wheel 4.
  • a lock-nut 15 is secured to the threaded portion 12 and abuts a lower shoulder 16 of the worm wheel 4 so that by means of the lock nut bearing on the shoulder 16 and the section 13 bearing on the shoulder 14 of the worm wheel the screw is held in a predetermined longitudinal position relative to the worm wheel 4.
  • a sealing sleeve 17 is located intermediate the housing cap 7 and the section 13 of the screw by a grub screw 18 and a circular aperture in the base portion 8 of the housing 1 is closed by a plug 19.
  • the worm and worm wheel are lubricated by a grease nipple 20 located on the side of the housing 1.
  • a travelling nut 21 is provided to co-operatively engage with the threaded portion 11 of the screw, the travelling nut 21 having four aqui-spaced holes 22 for fixing to a load (not shown) to be raised or lowered. Since the travelling nut 21 is secured to the load it does not rotate and hence upon rotation of the screw 9 so the travelling nut moves up or down depending upon the direction of rotation of the screw.
  • Such rotating worm screw jacks may be of the upright type as shown in Fig. 1 or of the inverted type in which the screw protrudes through the opening closed by the plug 19 and the screw threaded portion 11 and travelling nut 21 are below the portion 8 of the housing.
  • Rotating worm screw jacks of the forementioned types tend to be complex to manufacture due to the numerous machining operations that are required on the screw 9 and it is an object of the present invention to provide a rotating worm screw jack of simpler construction.
  • a rotating worm screw jack includes a worm meshing with a worm wheel and a screw drivingly secured to and rotatable with said worm wheel, said screw having an external thread meshing with an internal thread of the worm wheel and means for preventing relative rotation therebetween.
  • the means for preventing the relative rotation comprises at least one dowel pin inserted parallel to the longitudinal axis of said screw and into both the worm wheel and the nut.
  • the screw extends through the worm wheel to be substantially flush therewith at the side of the worm wheel, in operation, remote from a load and at least one dowel pin is inserted parallel to the longitudinal axis of said screw and into the confluenae of the major diameters of the meshing threads.
  • the at least one dowel pin is or are secured in position by, for example, adhesive.
  • the rotated worm screw jack shown in Fig. 2 is of the upright type although like the prior art screw jack described with reference to Fig. 1, the present invention is also applicable to inverted rotated worm screw jacks.
  • the screw 9 of the present invention is threaded throughout its entire length and the external thread of the screw meshing with an internal thread of the worm wheel 4 and the lower end of the screw remote from the load is arranged to be substantially flush with the lower side of the worm wheel. Relative rotation between the worm wheel 4 and screw 9 is prevented by two dowel pins 30, only one of which is shown for clarity.
  • the dowel pins 30 are substantially parallel to the longitudinal axis of the screw and are inserted at the confluence of the major diameters of the meshing threads of the worm wheel 4 and screw 9. So as to prevent loosening of the dowel pins 30 they are secured in position by any suitable means such as an adhesive known under the trade name as Loctite.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Transmission Devices (AREA)
EP80300151A 1979-01-19 1980-01-16 Schraubenwinde Withdrawn EP0014070A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7901966 1979-01-19
GB7901966 1979-01-19

Publications (1)

Publication Number Publication Date
EP0014070A1 true EP0014070A1 (de) 1980-08-06

Family

ID=10502610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80300151A Withdrawn EP0014070A1 (de) 1979-01-19 1980-01-16 Schraubenwinde

Country Status (1)

Country Link
EP (1) EP0014070A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1741664A2 (de) * 2005-07-05 2007-01-10 Jürgen Zimmermann Stelleinrichtung zum Positionieren einer Last

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB181994A (en) * 1921-07-11 1922-06-29 Joseph Hill Improvements in screw lifting jacks
FR554816A (fr) * 1919-10-16 1923-06-18 Cric
GB216269A (en) * 1923-03-27 1924-05-29 Hill John Improvements in and relating to lifting jacks for motor vehicles and the like
DE1275260B (de) * 1967-01-28 1968-08-14 E A Storz O H G Wagenheber
DE2445695A1 (de) * 1974-09-25 1976-04-08 Indramat Gmbh Lagegeregelte hubvorrichtung mit stellspindel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR554816A (fr) * 1919-10-16 1923-06-18 Cric
GB181994A (en) * 1921-07-11 1922-06-29 Joseph Hill Improvements in screw lifting jacks
GB216269A (en) * 1923-03-27 1924-05-29 Hill John Improvements in and relating to lifting jacks for motor vehicles and the like
DE1275260B (de) * 1967-01-28 1968-08-14 E A Storz O H G Wagenheber
DE2445695A1 (de) * 1974-09-25 1976-04-08 Indramat Gmbh Lagegeregelte hubvorrichtung mit stellspindel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1741664A2 (de) * 2005-07-05 2007-01-10 Jürgen Zimmermann Stelleinrichtung zum Positionieren einer Last
EP1741664A3 (de) * 2005-07-05 2007-11-21 Jürgen Zimmermann Stelleinrichtung zum Positionieren einer Last

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT SE

17P Request for examination filed

Effective date: 19810117

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19820614

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FORTUNE, ALAN