GB952645A - Improvements relating to levelling devices for rising and falling structures - Google Patents
Improvements relating to levelling devices for rising and falling structuresInfo
- 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
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.
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)
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 |
-
1961
- 1961-04-12 GB GB13096/61A patent/GB952645A/en not_active Expired
Cited By (4)
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 |
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