GB535654A - Improvements in jacks adapted for automatic hydraulic locking - Google Patents

Improvements in jacks adapted for automatic hydraulic locking

Info

Publication number
GB535654A
GB535654A GB25139/39A GB2513939A GB535654A GB 535654 A GB535654 A GB 535654A GB 25139/39 A GB25139/39 A GB 25139/39A GB 2513939 A GB2513939 A GB 2513939A GB 535654 A GB535654 A GB 535654A
Authority
GB
United Kingdom
Prior art keywords
jack
piston valve
load
soc
undercarriages
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
GB25139/39A
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.)
Olaer SA De Materiel Oleo Pneu
Original Assignee
Olaer SA De Materiel Oleo Pneu
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 Olaer SA De Materiel Oleo Pneu filed Critical Olaer SA De Materiel Oleo Pneu
Publication of GB535654A publication Critical patent/GB535654A/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
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B66F3/25—Constructional features
    • B66F3/30—Constructional features with positive brakes or locks

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Check Valves (AREA)
  • Actuator (AREA)

Abstract

535,654. Operating aircraft undercarriages. SOC. OLAER (SOC. ANON. DE MATERIAL OLEO-PNEUMATIQUE), and MERCIER, J. Sept. 1, 1939, No. 25139. Convention date, Jan. 18. [Class 4] An hydraulic jack for operating the undercarriages of aircraft is provided with a locking device comprising a piston valve actuated by the load on the jack and adapted to stop the flow through the conduits in the discharge direction as long as the load is on, or exceeds a pre-determined value. In the form shown the jack is extended by passing pressure fluid through a conduit 9 connecting the end of the working cylinder 1 by a groove 6 in a piston valve 3. When a predetermined resistance is encountered, the piston valve is moved inwardly against the action of a spring 17 into the position shown, and fluid for further extension of the jack passes through a non-return valve 12 in a byepass 10. The jack can be retracted only when the load upon it is relieved, for example when the weight of an aeroplane is removed from the undercarriage on taking-off. In some cases, the jack operates against tensile forces. In modifications, the piston valve passes into the working cylinder and is subjected to the pressure in the cylinder as well as to that of a spring.
GB25139/39A 1939-01-18 1939-09-01 Improvements in jacks adapted for automatic hydraulic locking Expired GB535654A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR535654X 1939-01-18

Publications (1)

Publication Number Publication Date
GB535654A true GB535654A (en) 1941-04-17

Family

ID=8926311

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25139/39A Expired GB535654A (en) 1939-01-18 1939-09-01 Improvements in jacks adapted for automatic hydraulic locking

Country Status (1)

Country Link
GB (1) GB535654A (en)

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