FR2358355A1 - Lifting gear for precision positioning of load - has mercury floating in tube between contacts to sense small pressures when manoeuvring - Google Patents

Lifting gear for precision positioning of load - has mercury floating in tube between contacts to sense small pressures when manoeuvring

Info

Publication number
FR2358355A1
FR2358355A1 FR7621665A FR7621665A FR2358355A1 FR 2358355 A1 FR2358355 A1 FR 2358355A1 FR 7621665 A FR7621665 A FR 7621665A FR 7621665 A FR7621665 A FR 7621665A FR 2358355 A1 FR2358355 A1 FR 2358355A1
Authority
FR
France
Prior art keywords
load
mercury
precision positioning
lifting gear
manoeuvring
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
FR7621665A
Other languages
French (fr)
Other versions
FR2358355B3 (en
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7621665A priority Critical patent/FR2358355A1/en
Publication of FR2358355A1 publication Critical patent/FR2358355A1/en
Application granted granted Critical
Publication of FR2358355B3 publication Critical patent/FR2358355B3/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)

Abstract

The lifting gear is used for precision positioning of a load and comprises a compressed air cylinder suspended vertically to carry a motorised lifting drum (4). The piston initially lifts the load approximately into position. The air also acts on both sides of a U-shaped tube (17) filled with mercury and when air is shut off, the system is in balance. Power cylinders then partly rotate the main cylinder about its vertical axis to break any friction seal. Downward or upward pressure (f9) on the load unbalances the column, mercury floating between electrical contacts (Co, Cl) to operate the cabld drum in the same direction (f10).
FR7621665A 1976-07-15 1976-07-15 Lifting gear for precision positioning of load - has mercury floating in tube between contacts to sense small pressures when manoeuvring Granted FR2358355A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7621665A FR2358355A1 (en) 1976-07-15 1976-07-15 Lifting gear for precision positioning of load - has mercury floating in tube between contacts to sense small pressures when manoeuvring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7621665A FR2358355A1 (en) 1976-07-15 1976-07-15 Lifting gear for precision positioning of load - has mercury floating in tube between contacts to sense small pressures when manoeuvring

Publications (2)

Publication Number Publication Date
FR2358355A1 true FR2358355A1 (en) 1978-02-10
FR2358355B3 FR2358355B3 (en) 1979-04-06

Family

ID=9175762

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7621665A Granted FR2358355A1 (en) 1976-07-15 1976-07-15 Lifting gear for precision positioning of load - has mercury floating in tube between contacts to sense small pressures when manoeuvring

Country Status (1)

Country Link
FR (1) FR2358355A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0235761A2 (en) * 1986-02-28 1987-09-09 Hitachi Juki Sekkei Co. Fluid control system
FR2639132A1 (en) * 1988-11-14 1990-05-18 Feralco Convoyeurs Cie Load limiter, particularly for an elevator (lifting device) controlled by a chain or the like

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0235761A2 (en) * 1986-02-28 1987-09-09 Hitachi Juki Sekkei Co. Fluid control system
EP0235761A3 (en) * 1986-02-28 1990-01-10 Hitachi Juki Sekkei Kk Fluid control system
FR2639132A1 (en) * 1988-11-14 1990-05-18 Feralco Convoyeurs Cie Load limiter, particularly for an elevator (lifting device) controlled by a chain or the like

Also Published As

Publication number Publication date
FR2358355B3 (en) 1979-04-06

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Legal Events

Date Code Title Description
ST Notification of lapse