GB1292032A - Lifting devices - Google Patents

Lifting devices

Info

Publication number
GB1292032A
GB1292032A GB460669A GB460669A GB1292032A GB 1292032 A GB1292032 A GB 1292032A GB 460669 A GB460669 A GB 460669A GB 460669 A GB460669 A GB 460669A GB 1292032 A GB1292032 A GB 1292032A
Authority
GB
United Kingdom
Prior art keywords
dogs
nut
load
engage
ball nut
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
GB460669A
Inventor
Ernest Leonard Allen
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.)
Lucas Support Services Ltd
Original Assignee
Rotax 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 Rotax Ltd filed Critical Rotax Ltd
Priority to GB460669A priority Critical patent/GB1292032A/en
Priority to AU10412/70A priority patent/AU1041270A/en
Priority to FR7002195A priority patent/FR2029529A1/fr
Priority to DE19702003232 priority patent/DE2003232A1/en
Publication of GB1292032A publication Critical patent/GB1292032A/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
    • B66F3/20—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated actuated through multiple or change-speed 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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Types And Forms Of Lifts (AREA)
  • Transmission Devices (AREA)

Abstract

1292032 Screw-and-nut gearing ROTAX Ltd 14 Jan 1970 [28 Jan 1969] 4606/69 Heading F2Q [Also in Division B8] A jack comprises a hollow housing 18 through which can pass a screw shaft 13 attached non-rotatably to a concrete slot (11), Fig. 7 (not shown), to be lifted. A drive member 17 is located in the housing 18 by bearings 19 and may be rotated by a motor (14), Fig. 2 (not shown), through a roller chain 16, the motor (14) being arranged to operate two jacks by two such chains 16. A ball nut 20 is rotatably. arranged in the housing 18 and threaded on the shaft 13 above the member 17 and a plain nut 23 similarly arranged below the member 17 which has driving dogs 25 diametrically disposed on either end to engage driving dogs 26 on the respective nuts 20, 23. The arcuate-length of the dogs 26 is greater than that of the dogs 25, while the arcuate spacing between the dogs 26 is greater than the arcuate length of the dogs 25. In the rest position the plain nut 23 takes the load and, on rotation of the member 17 to raise the load the upper dogs 25 engage the ball nut dogs 26 to drive the ball nut 20 before the lower dogs 25 engage the plain nut dogs 26. This transfers the load to the ball nut 20, continued rotation of the member 17 raising the load, while the lower dogs 25, 26 engage to rotate the plain nut 23, which is now not under load, to follow-up.
GB460669A 1969-01-28 1969-01-28 Lifting devices Expired GB1292032A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB460669A GB1292032A (en) 1969-01-28 1969-01-28 Lifting devices
AU10412/70A AU1041270A (en) 1969-01-28 1970-01-19 Lifting devices
FR7002195A FR2029529A1 (en) 1969-01-28 1970-01-22
DE19702003232 DE2003232A1 (en) 1969-01-28 1970-01-24 Lifting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB460669A GB1292032A (en) 1969-01-28 1969-01-28 Lifting devices

Publications (1)

Publication Number Publication Date
GB1292032A true GB1292032A (en) 1972-10-11

Family

ID=9780343

Family Applications (1)

Application Number Title Priority Date Filing Date
GB460669A Expired GB1292032A (en) 1969-01-28 1969-01-28 Lifting devices

Country Status (4)

Country Link
AU (1) AU1041270A (en)
DE (1) DE2003232A1 (en)
FR (1) FR2029529A1 (en)
GB (1) GB1292032A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4386711A (en) * 1980-11-07 1983-06-07 Harnischfeger Corporation Crane having stabilizer outriggers and vertically positionable jacks for same

Also Published As

Publication number Publication date
DE2003232A1 (en) 1970-07-30
AU1041270A (en) 1971-07-22
FR2029529A1 (en) 1970-10-23

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Legal Events

Date Code Title Description
PS Patent sealed
PLE Entries relating assignments, transmissions, licences in the register of patents
PLNP Patent lapsed through nonpayment of renewal fees