GB952645A - Improvements relating to levelling devices for rising and falling structures - Google Patents

Improvements relating to levelling devices for rising and falling structures

Info

Publication number
GB952645A
GB952645A GB13096/61A GB1309661A GB952645A GB 952645 A GB952645 A GB 952645A GB 13096/61 A GB13096/61 A GB 13096/61A GB 1309661 A GB1309661 A GB 1309661A GB 952645 A GB952645 A GB 952645A
Authority
GB
United Kingdom
Prior art keywords
switch
valves
platform
mercury
corner
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
GB13096/61A
Inventor
Francis Joseph Mcnulty
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.)
LLOYD S PACKING WAREHOUSES HOL
Original Assignee
LLOYD S PACKING WAREHOUSES HOL
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 LLOYD S PACKING WAREHOUSES HOL filed Critical LLOYD S PACKING WAREHOUSES HOL
Priority to GB13096/61A priority Critical patent/GB952645A/en
Publication of GB952645A publication Critical patent/GB952645A/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
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/10—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks
    • B66F7/16—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks
    • B66F7/20—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported directly by jacks by one or more hydraulic or pneumatic jacks by several jacks with means for maintaining the platforms horizontal during movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F1/00—Ground or aircraft-carrier-deck installations
    • B64F1/32—Ground or aircraft-carrier-deck installations for handling freight
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
    • B65G69/22—Horizontal loading or unloading platforms
    • B65G69/24—Horizontal loading or unloading platforms having platform level adjusting means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

952, 645. Levels. LLOYD'S PACKING WAREHOUSES (HOLDINGS) Ltd. July 9, 1962 [April 12, 1961], No. 13096/61. Heading G1F. [Also in Division B8] A platform, deck, or other structure which is raised and lowered by hydraulic rams acting at its corners, e.g. the aircraft loading platform described in Specification 920,101, is kept level as it rises and falls by attitude responsive switches, located one at each corner which control the flow of hydraulic fluid to and from the rams. Rams 1a-1d are supplied with pressure fluid through a conduit 7 and valves 4a-4d and exhausted through valves 6a-6d and a conduit 8. Mercury switches 18 are located one at each corner and interconnected by a conduit 19 so that the level of mercury within each switch is proportional to its height with respect to the others. When the platform is level the parts are as shown and contact is made between contacts 20, 21 in each switch. When a change-over switch 15 is in position 15a solenoids 14 of the supply valves 4a-4d are energized to open the valves and cause the platform to rise. If one corner rises more quickly than the others the mercury level in the associated switch will fall away from the contact 21 thus breaking the circuit to the solenoid 14 and closing the valve 4. The closure may be complete or partial and results in the corner concerned rising more slowly or stopping until the others reach the same level. During lowering, the switch 15 is in position 15b and the solenoids 14 of exhaust valves 6a-6d are open. Also contacts 16 are closed by a relay 17. If one corner moves down lower than the others the mercury in the switch rises until contact 22 comes into the circuit. Thus a positive potential is applied to both ends of the relay 17 which is thereby deenergized and allows contacts 16 to open. This breaks the circuit to the solenoid 14 of the lowering valve 6, which closes. In the event of a hydraulic or mechanical failure which causes the platform to tilt, the mercury in the lowest switch reaches a contact 23 which energizes a "fail-safe" relay 28. This arrests the platform by opening contacts 29 thereby de-energizing all the solenoids 14 and closing all the valves 4, 6.
GB13096/61A 1961-04-12 1961-04-12 Improvements relating to levelling devices for rising and falling structures Expired GB952645A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB13096/61A GB952645A (en) 1961-04-12 1961-04-12 Improvements relating to levelling devices for rising and falling structures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB13096/61A GB952645A (en) 1961-04-12 1961-04-12 Improvements relating to levelling devices for rising and falling structures

Publications (1)

Publication Number Publication Date
GB952645A true GB952645A (en) 1964-03-18

Family

ID=10016763

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13096/61A Expired GB952645A (en) 1961-04-12 1961-04-12 Improvements relating to levelling devices for rising and falling structures

Country Status (1)

Country Link
GB (1) GB952645A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1267610B (en) * 1967-03-17 1968-05-02 Buetfering Maschfab Geb Tipping platform for unloading vehicles
FR2587784A1 (en) * 1985-09-20 1987-03-27 Chatenay Catherine EXTENDABLE AND RETRACTABLE STRUCTURE WITH ORIENTABLE PLAN
EP0287044A1 (en) * 1987-04-16 1988-10-19 Hydro-Gerätebau GmbH & Co. KG Hebezeuge Arrangement for lifting aircraft
GB2212929A (en) * 1987-11-25 1989-08-02 Heerema Engineering Deflection measurement

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1267610B (en) * 1967-03-17 1968-05-02 Buetfering Maschfab Geb Tipping platform for unloading vehicles
FR2587784A1 (en) * 1985-09-20 1987-03-27 Chatenay Catherine EXTENDABLE AND RETRACTABLE STRUCTURE WITH ORIENTABLE PLAN
EP0287044A1 (en) * 1987-04-16 1988-10-19 Hydro-Gerätebau GmbH & Co. KG Hebezeuge Arrangement for lifting aircraft
GB2212929A (en) * 1987-11-25 1989-08-02 Heerema Engineering Deflection measurement

Similar Documents

Publication Publication Date Title
US3726303A (en) Fluid flow control valves
US4129141A (en) Scram valve
GB952645A (en) Improvements relating to levelling devices for rising and falling structures
ES8403578A1 (en) Cabtilt system for a vehicle.
US4977635A (en) Control circuit for vertically storing dock leveler
US2948262A (en) Pressure-limiting device
GB1467148A (en) Fluid operated vehicle body level control system
GB1440107A (en) Liquid level control valve
IL40114A (en) Method and apparatus for treating timber
US3756264A (en) Pressure control devices for fluid flow systems
GB927511A (en) Pressure operated control valve
US1995299A (en) Means for controlling surge pressures
US3131721A (en) Accumulator and charging means therefor
GB1202918A (en) Warning device for cylinders for liquefied gas under pressure
JPS643841Y2 (en)
FR2530779B1 (en)
JPH0352252Y2 (en)
JPS57127174A (en) Flow control method and valve applied thereof
GB1257048A (en)
US3688791A (en) Siphon system
JPS5922322Y2 (en) Valve device for driving single-acting cylinder piston device for lifting heavy objects
JPH0442295Y2 (en)
GB893280A (en) Valves suitable for use as breather valves in pit props
US480486A (en) Joseph e
SU696231A1 (en) Hydraulic valve