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EP0021623A1 - Cric actionné par vis sans fin et procédé pour sa fabrication - Google Patents

Cric actionné par vis sans fin et procédé pour sa fabrication Download PDF

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Publication number
EP0021623A1
EP0021623A1 EP80301809A EP80301809A EP0021623A1 EP 0021623 A1 EP0021623 A1 EP 0021623A1 EP 80301809 A EP80301809 A EP 80301809A EP 80301809 A EP80301809 A EP 80301809A EP 0021623 A1 EP0021623 A1 EP 0021623A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
worm gear
worm
lifting screw
screw
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.)
Granted
Application number
EP80301809A
Other languages
German (de)
English (en)
Other versions
EP0021623B1 (fr
Inventor
Alan C/O Fortune Engineering Limited 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 EP0021623A1 publication Critical patent/EP0021623A1/fr
Application granted granted Critical
Publication of EP0021623B1 publication Critical patent/EP0021623B1/fr
Expired 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 a worm screw Jack.
  • Known worm screw jacks generally have a housing in which is provided a worm rotatively arranged to be driven by means outside the housing, the worm being connected to meshingly engage with a worm gear which is constrained against axial movement within the housing and which, in turn, meshingly engages with a lifting screw.
  • the lifting screw is normally secured to a load so that the lifting screw is unable to rotate and rotation of the worm causes rotation of the worm gear which, since it is constrained against axial movement raises the lifting screw and hence the load.
  • the present invention seeks to provide a worm screw jack in which backlash is substantially eliminated.
  • a worm screw jack includes a worm meshing with a worm gear which is drivingly connected to a lifting screw, and a sleeve positioned axially along the lifting screw from the worm gear, said sleeve being secured to the worm gear by a shoulder member and a mating recess arrangement so as to be rotatable therewith, wherein the shoulder member is elongate in a direction transverse to the lifting screw axis.
  • the shoulder member is formed on the worm gear and the mating recess is provided on the sleeve.
  • the axial length of the sleeve is preferably less than the pitch of the lifting screw and conveniently is 8% less.
  • the shoulder member is a quadrilateral protiusion diametrically extending across the lifting screw axis formed by substantially parallel flat surfaces in the plane of the lifting screw axis with partially circular end-faces, and the sleeve recess is arranged to mate with the quadrilateral protrusion.
  • a circularly cross-sectioned extension is provided on the shoulder member, having a smaller diameter than that of the partially circular end faces, which is arranged to be an interference fit inside a bore of the sleeve thereby assisting to maintain the worm gear and sleeve in axial alignment.
  • safety factor X 0.5 where safety factor is 1.
  • a method of making a screw jack having a worm meshing with a worm gear which is drivingly connected to a lifting screw and a sleeve positioned axially along the lifting screw from the worm gear, said sleeve being secured to the worm gear by a shoulder member and mating recess arrangement so as to be rotatable therewith includes the step of axially aligning the worm gear and sleeve a pre-determined distance apart and cutting an internal screw thread through the worm gear and sleeve combination.
  • the pre-determined distance is provided by a split spacer of thickness given by safety factor X 0.5 which is secured between adjacent faces of the worm gear and sleeve.
  • the method includes the further steps of mounting the assembly of worm gear, split spacer and the sleeve on the lifting screw, removing the split spacer, engaging the worm gear with the worm and loading the sleeve so that the internal threads of the sleeve and worm gear apply opposing axial forces on the lifting screw threads.
  • the worm screw jack shown in Figure 1 has 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 which worm threads of a worm gear 4/is rotatable upon a lower thrust bearing 5 comprising bearing elements caged in any suitable manner, the bearing being restrained within an annular recess in a base portion of the housing 1,
  • the worm gear 4 is drivingly connected to a sleeve 6 which is mounted in an upper thrust bearing 7 which is similar to the lower thrust bearing 5 and is restrained within an annular recess in a shell cap 8, the shell cap 8 being the cadably engaged within a top, neck portion, of the housing 1.
  • a lifting screw 9 Extending perpendicularly to the axes of the worm 2 and worm gear 4 is a lifting screw 9, having a trapezoidal thread, which meshingly engages with an internal thread in both the worm gear 4 and sleeve 6.
  • the lifting screw 9, at its upper end, as shown in Fig. 1, has a screw threaded portion 12 of smaller pitch circle diameter than the screw thread engaging with the lifting screw and worm gear which portion 12 is normally screwed and fixed to a plate member (not shown) for supporting a load.
  • the housing additionally has an aperture in the base portion through which the lifting screw is able to move in a vertical direction and a tubular extension 10 of the housing (shown broken away). shield the lifting screw in its lowered position.
  • Two mounting apertures 11 are provided in the base portion of the housing 1.
  • the worm gear 4 is shown in detail in Figures 2 and 3 and from these Figures it will be seen that the axially upper part of the worm gear has a shoulder 20 formed from a quadrilateral protrusion which extends diametrically across the lifting screw axis, the quadrilateral being shaped by substantially parallel flat surfaces 21 in the plane of the lifting screw-axis and with partially circular end t faces 22.
  • the axial length of the shoulder 20 is arranged to be less than the pitch of the lifting screw and is preferably 8% less.
  • a circularly cross-sectioned extension 23 is provided on the shoulder 20 having a smaller diameter than that of the partially circular end faces 22.
  • the detail of the sleeve 6 is shown in Figures 4 and 5 and this sleeve, which is made from phosphor bronze, has a stepped outside circular cross-section dimensioned so that the upper thrust bearing is fitted around the upper, smaller diameter of the sleeve and abuts the step in the sleeve,
  • the sleeve has a coaxial] recess 30 in the larger diamater portion which is of similar shape to the quadrilateral shoulder 20 of the worm gear and is arranged to be an interference fit with the shoulder 20.
  • a bore 31, coaxial with the recess 30 is also provided in the sleeve and the bore 31 is an interference fit with the circularly cross-sectioned extension 23 of the worm gear, the purpose of the bore 31 and extension 23 being to assist the alignment of the worm gear 4 inside the sleeve 6.
  • the worm gear and sleeve are made separately until the internal screw thread for mating with the lifting screw is provided.
  • the worm gear and sleeve are then axially aligned and spaced apart by a split spacer having a thickness given by safety factor X 0.5, where the safety factor is normally unity.
  • the combination of worm gear, split spacer and sleeve are then machined with an internal screw thread which will mesh with the trapezoidal screw thread of the lifting screw 9.
  • the machined combination is then assembled on the lifting screw, the split spacer is removed and the assembly together with the worm and shaft 2, 3 and the bearings 5, 7 is mounted in the housing and the shell cap 8 screwed into place.
  • the plate fixed to the threaded portion 12 is secured to a load and since the load does not rotate there is no rotational movement between the housing 1 and the lifting screw 9 and so rotation of the worm 2 causes rotation of the worm gear 4 and sleeve 6 combination thereby resulting in vertical drive to the lifting screw 9.
  • the quadrilaterally shaped protrusion on the shoulder of the worm gear 4 and mating recess in the sleeve 6 has the advantage that a substantial driving area of contact is provided. Furthermore, by machining the internal trapezoidal screw thread on the worm gear 4 and sleeve 6 with these two members combined together it is ensured that the angular relationship between these members is maintained and that the only manner by which backlash may be taken up is by screwing down the shell cap 8, it being remembered that the length of the shoulder 20 is preferably less than the screw pitch.
  • the present invention has the great safety advantage in that the maximum amount of wear permitted with the screw threads of the lifting screw which may be eliminated is governed by the initial distance between the faces 41, 61, i.e. 0.25 screw pitch.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Transmission Devices (AREA)
  • Gears, Cams (AREA)
EP19800301809 1979-05-31 1980-05-30 Cric actionné par vis sans fin et procédé pour sa fabrication Expired EP0021623B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB7918902 1979-05-31
GB7918902 1979-05-31
GB7928481 1979-08-15
GB7928481 1979-08-15

Publications (2)

Publication Number Publication Date
EP0021623A1 true EP0021623A1 (fr) 1981-01-07
EP0021623B1 EP0021623B1 (fr) 1987-03-04

Family

ID=26271707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800301809 Expired EP0021623B1 (fr) 1979-05-31 1980-05-30 Cric actionné par vis sans fin et procédé pour sa fabrication

Country Status (2)

Country Link
EP (1) EP0021623B1 (fr)
DE (1) DE3071916D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109648453A (zh) * 2019-01-28 2019-04-19 深圳市钜达机械设备有限公司 一种用于抛光机的可旋转式升降装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103009074B (zh) * 2012-11-30 2015-03-18 无锡京华重工装备制造有限公司 单柱立式车床横梁升降结构
CN103639447B (zh) * 2013-11-18 2016-03-16 无锡京华重工装备制造有限公司 一种横梁保护结构

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE341834C (fr) *
DE38503C (de) * A. BROSIG in Habelschwerdt, Schlesien Zweitheilige Schraubenmutter mit entgegenwirkenden Schrauben zur Vermeidung des todten Ganges
DE956804C (de) * 1954-07-07 1957-01-24 Anton Schroeder Fangvorrichtung fuer Hubvorrichtungen mit Spindeltrieb, insbesondere Hebebuehne
US2919596A (en) * 1958-02-24 1960-01-05 Gorton George Machine Co Anti-backlash nut
GB956958A (en) * 1962-02-26 1964-04-29 Joyce Cridland Co Screw jack
US3176963A (en) * 1962-03-23 1965-04-06 Joyce Cridland Co Safety jack with auxiliary safety nut
DE1258573B (de) * 1964-10-28 1968-01-11 Duff Norton Co Schraubenspindeltrieb
DE1550657B2 (de) * 1966-02-03 1971-06-09 Blohm, Robert, 2000 Hamburg Berge dorf Getriebe mit einer vertikal schraubbeweglich angeordneten gewindespindel
GB1291260A (en) * 1969-03-29 1972-10-04 Shackleton Engineering Ltd Screw jacks
FR2128112A3 (fr) * 1971-03-05 1972-10-20 Satam
GB1345136A (en) * 1972-12-15 1974-01-30 Philadelphia Gear Corp Anti-backlash screw jack

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE341834C (fr) *
DE38503C (de) * A. BROSIG in Habelschwerdt, Schlesien Zweitheilige Schraubenmutter mit entgegenwirkenden Schrauben zur Vermeidung des todten Ganges
DE956804C (de) * 1954-07-07 1957-01-24 Anton Schroeder Fangvorrichtung fuer Hubvorrichtungen mit Spindeltrieb, insbesondere Hebebuehne
US2919596A (en) * 1958-02-24 1960-01-05 Gorton George Machine Co Anti-backlash nut
GB956958A (en) * 1962-02-26 1964-04-29 Joyce Cridland Co Screw jack
US3176963A (en) * 1962-03-23 1965-04-06 Joyce Cridland Co Safety jack with auxiliary safety nut
DE1258573B (de) * 1964-10-28 1968-01-11 Duff Norton Co Schraubenspindeltrieb
DE1550657B2 (de) * 1966-02-03 1971-06-09 Blohm, Robert, 2000 Hamburg Berge dorf Getriebe mit einer vertikal schraubbeweglich angeordneten gewindespindel
GB1291260A (en) * 1969-03-29 1972-10-04 Shackleton Engineering Ltd Screw jacks
FR2128112A3 (fr) * 1971-03-05 1972-10-20 Satam
GB1345136A (en) * 1972-12-15 1974-01-30 Philadelphia Gear Corp Anti-backlash screw jack

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109648453A (zh) * 2019-01-28 2019-04-19 深圳市钜达机械设备有限公司 一种用于抛光机的可旋转式升降装置
CN109648453B (zh) * 2019-01-28 2024-05-07 深圳市钜达机械设备有限公司 一种用于抛光机的可旋转式升降装置

Also Published As

Publication number Publication date
EP0021623B1 (fr) 1987-03-04
DE3071916D1 (en) 1987-04-09

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