GB925995A - Improvements relating to screw lifting devices, but particularly for milling machines and like machine tools - Google Patents

Improvements relating to screw lifting devices, but particularly for milling machines and like machine tools

Info

Publication number
GB925995A
GB925995A GB1558960A GB1558960A GB925995A GB 925995 A GB925995 A GB 925995A GB 1558960 A GB1558960 A GB 1558960A GB 1558960 A GB1558960 A GB 1558960A GB 925995 A GB925995 A GB 925995A
Authority
GB
United Kingdom
Prior art keywords
nut
screw
wear
load
failure
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
GB1558960A
Inventor
John Joseph O'neill
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries 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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB1558960A priority Critical patent/GB925995A/en
Publication of GB925995A publication Critical patent/GB925995A/en
Expired legal-status Critical Current

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles
    • B23Q5/58—Safety devices
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Structural Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

925,995. Screw-and-nut gearing. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. April 27, 1961 [May 3, 1960], No. 15589/60. Class 80 (3). In a safety device limiting the fall of a vertical rotatable screw 10, supporting a load such as a machine tool table, following wear or damage of the threads between the screw 10 and its fixed nut 11, an idle nut 18, which on failure of the nut 11 can seat on a thrust bearing 17 to support the load, is coupled non-rotatably to the nut 11 by pins 20 which uncouple after an amount a of axial movement. The distance a is equal to the amount of wear expected before failure of the nut threads. As wear occurs in the nut 11 the nut 18 moves closer to the bearing 17. As the nut fails the screw falls a distance A-a to seat nut 18 on bearing 17. During the fall the pins 20 become disconnected so that subsequent rotation of the screw 10 does not raise or lower the load, thereby indicating the failure of the nut 11. An aperture 21 allows inspection of the spacing A, which indicates the extent of wear in the nut 11. The pin connection 20 may be replaced by a splined or castellated connection.
GB1558960A 1960-05-03 1960-05-03 Improvements relating to screw lifting devices, but particularly for milling machines and like machine tools Expired GB925995A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1558960A GB925995A (en) 1960-05-03 1960-05-03 Improvements relating to screw lifting devices, but particularly for milling machines and like machine tools

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1558960A GB925995A (en) 1960-05-03 1960-05-03 Improvements relating to screw lifting devices, but particularly for milling machines and like machine tools

Publications (1)

Publication Number Publication Date
GB925995A true GB925995A (en) 1963-05-15

Family

ID=10061832

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1558960A Expired GB925995A (en) 1960-05-03 1960-05-03 Improvements relating to screw lifting devices, but particularly for milling machines and like machine tools

Country Status (1)

Country Link
GB (1) GB925995A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0048978A2 (en) * 1980-09-30 1982-04-07 Siemens-Elema AB Screw nut transmission for vertical displacement of a load (fall arrest safety device)
EP1467124A3 (en) * 2003-04-11 2006-06-07 Umbra Cuscinetti S.p.A. Ball screw actuator for aircraft control surfaces
CN107285247A (en) * 2017-08-23 2017-10-24 上海联影医疗科技有限公司 Lowering or hoisting gear and C arm machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0048978A2 (en) * 1980-09-30 1982-04-07 Siemens-Elema AB Screw nut transmission for vertical displacement of a load (fall arrest safety device)
EP0048978A3 (en) * 1980-09-30 1982-06-16 Siemens-Elema AB Screw nut transmission for vertical displacement of a load (fall arrest safety device)
EP1467124A3 (en) * 2003-04-11 2006-06-07 Umbra Cuscinetti S.p.A. Ball screw actuator for aircraft control surfaces
CN107285247A (en) * 2017-08-23 2017-10-24 上海联影医疗科技有限公司 Lowering or hoisting gear and C arm machine
US20190062132A1 (en) * 2017-08-23 2019-02-28 Shanghai United Imaging Healthcare Co., Ltd. Anti-fall mechanism for lifting equipment
US10717635B2 (en) * 2017-08-23 2020-07-21 Shanghai United Imaging Healthcare Co., Ltd. Anti-fall mechanism for lifting equipment
US11247882B2 (en) 2017-08-23 2022-02-15 Shanghai United Imaging Healthcare Co., Ltd. Anti-fall mechanism for lifting equipment

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