ES315449A1 - Apparatus for controlling the operation of fluid operated jacks required to be moved in synchronism - Google Patents
Apparatus for controlling the operation of fluid operated jacks required to be moved in synchronismInfo
- Publication number
- ES315449A1 ES315449A1 ES0315449A ES315449A ES315449A1 ES 315449 A1 ES315449 A1 ES 315449A1 ES 0315449 A ES0315449 A ES 0315449A ES 315449 A ES315449 A ES 315449A ES 315449 A1 ES315449 A1 ES 315449A1
- Authority
- ES
- Spain
- Prior art keywords
- jack
- jacks
- cross
- platform
- crossmember
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
A hoisting apparatus comprises two hydraulic jacks V1, V2 whose pistons P1, P2 are fixed to the ground in a vertical position and whose cylinders C1, C2 are supplied with pressure liquid through pipes a1, a2. A load supporting platform is represented by a crossmember T attached to the cylinders C1, C2 by pin joints A1, A2. In order to cause the jacks to move together so as to keep the crossmember T horizontal each cylinder C1, C2 comprises a bleed pipe b1, b2, respectively, connected to a valve 1 fixed to the cylinder C1. The valve 1 consists of a body 6 with a bore 7 into which extend ducts 8, 9, 10, 101. A slide member 11 extended by a rod 12 is connected by a rod 3 and pivoted lever 4 to the cross-member T. If the jack V1 rises more rapidly than the jack V2 the lever 4 is pivoted clockwise by the tilting of the cross-member T so that the slide member 11 moves to the left to connect the bleed orifice b 1 to tank through the duets 8, 101 to slow down the jack V1. On descent the system operates in the same way, the bleed orifice of the lagging jack being connected to tank to accelerate its descent. The means sensitive to the relative movement of the jacks V1, V2 may be two micro-contactors (13), (14), Fig. 3 (not shown): a mercury contactor (15), Fig.4 (not shown) photo-sensitive cells (26), (27), Fig. 5 (not shown), or an arm (28), Fig. 6 (not shown), may act directly on micro-contactors. In a platform raised by four jacks (not shown) the horizontality of the platform may be maintained by combining the jacks in pairs, each jack being provided with two synchronizing devices, one of which controls the tilt of a transverse cross member, and the other the tilt of a longitudinal cross-member.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8588 | 1965-03-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
ES315449A1 true ES315449A1 (en) | 1966-02-16 |
Family
ID=8573388
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES0315449A Expired ES315449A1 (en) | 1965-03-10 | 1965-07-17 | Apparatus for controlling the operation of fluid operated jacks required to be moved in synchronism |
Country Status (2)
Country | Link |
---|---|
ES (1) | ES315449A1 (en) |
GB (1) | GB1143363A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4750405A (en) * | 1983-08-30 | 1988-06-14 | The Perkin-Elmer Corporation | Vibration and shock isolation apparatus |
FR2937782B1 (en) * | 2008-10-29 | 2010-12-17 | Areva Np | DEVICE AND METHOD FOR EXTRACTING A MODULE FROM A STACKING RACK OF NUCLEAR COMBUSTIBLE ASSEMBLIES USED IN A SWIMMING POOL OF A NUCLEAR POWER PLANT |
CN111498743B (en) * | 2020-04-30 | 2021-10-15 | 中铁二十二局集团有限公司 | Direct-buried heat-insulation pipeline installation construction method |
-
1965
- 1965-07-17 ES ES0315449A patent/ES315449A1/en not_active Expired
-
1966
- 1966-03-10 GB GB1061566A patent/GB1143363A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB1143363A (en) | 1969-02-19 |
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