GB724273A - Improvements in or relating to hydraulic jacking systems - Google Patents

Improvements in or relating to hydraulic jacking systems

Info

Publication number
GB724273A
GB724273A GB1446651A GB1446651A GB724273A GB 724273 A GB724273 A GB 724273A GB 1446651 A GB1446651 A GB 1446651A GB 1446651 A GB1446651 A GB 1446651A GB 724273 A GB724273 A GB 724273A
Authority
GB
United Kingdom
Prior art keywords
piston
jack
cylinder
jacks
june
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
GB1446651A
Inventor
Cyril William Tridgell
John Rodway
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.)
Power Jacks Ltd
Original Assignee
Power Jacks Ltd
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 Power Jacks Ltd filed Critical Power Jacks Ltd
Priority to GB1446651A priority Critical patent/GB724273A/en
Publication of GB724273A publication Critical patent/GB724273A/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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/22—Synchronisation of the movement of two or more servomotors

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

724,273. Endless conveyers; lifting-jacks; platform hoists. POWER JACKS, Ltd. June 19, 1952 [June 19, 1951; June 4, 1952], Nos. 14466/51 and 14055/52. Classes 78 (1) and 78 (3). [Also in Group XXIX] In a jacking system of the kind having a plurality of jacks arranged hydraulically in series, the piston of the or each preceding jack in the system operating on one side as a ram piston and on the other side as a pump piston feeding a succeeding jack; the distance to volume ratio of the intake of each succeeding jack is equal to the distance to volume ratio of the pump side of the preceding jack operating as a pump piston, and is also equal to half the distance to volume ratio of the other side of such preceding jack. The invention is described in connection with an adjustable belt conveyer (not shown) for stacking goods on elevated shelves and comprising a conveyer supporting beam arranged to be supported at each side by a jack, but is stated to be applicable to a platform lift provided with two or four jacks. As shown, the cross-sectional area of the bore of the main ack cylinder a is twice the cross-sectional area of the bore of the cylinder b, and twice the cross-sectional area of the piston-rod c. To enable the positions of the two piston-rods to be synchronized, a ball-valve j is adapted to be opened by a member l, m when the piston reaches the top of the cylinder, so allowing the fluid to circulate freely past the piston d. The jack b is provided with an air vent h and a bleed valve (not shown) which when this jack is fully extended releases any air therein. In a modification (Fig. 3, not shown), the ball valve is lifted when the piston reaches the bottom of the cylinder by a rod provided with a piston so arranged that the rod is withdrawn from contact with the ball when fluid is admitted through port e.
GB1446651A 1951-06-19 1951-06-19 Improvements in or relating to hydraulic jacking systems Expired GB724273A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1446651A GB724273A (en) 1951-06-19 1951-06-19 Improvements in or relating to hydraulic jacking systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1446651A GB724273A (en) 1951-06-19 1951-06-19 Improvements in or relating to hydraulic jacking systems

Publications (1)

Publication Number Publication Date
GB724273A true GB724273A (en) 1955-02-16

Family

ID=10041697

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1446651A Expired GB724273A (en) 1951-06-19 1951-06-19 Improvements in or relating to hydraulic jacking systems

Country Status (1)

Country Link
GB (1) GB724273A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2164637A1 (en) * 1971-12-22 1973-08-03 Ibm
US4892028A (en) * 1984-09-10 1990-01-09 Vbm Corporation Fluid operated circuit for controlling a dual post hydraulic lift assembly
GB2241936A (en) * 1990-02-08 1991-09-18 Congleton Eng Dev Improved lifting arrangement
GB2251593A (en) * 1990-12-04 1992-07-15 Linvar Ltd A platform for a boom conveyor
EP2428482A1 (en) * 2010-09-14 2012-03-14 Otto Nussbaum GmbH & Co. KG Lifting platform for motor vehicles
CN108100920A (en) * 2018-02-08 2018-06-01 上海航空机械有限公司 A kind of synchronization lifting jack and jack hydraulic system
CN113955653A (en) * 2021-10-11 2022-01-21 中联重科建筑机械(江苏)有限责任公司 Self-climbing tower crane and multi-cylinder jacking system thereof
CN108100920B (en) * 2018-02-08 2024-05-10 上海航空机械有限公司 Synchronous lifting jack and jack hydraulic system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2164637A1 (en) * 1971-12-22 1973-08-03 Ibm
US4892028A (en) * 1984-09-10 1990-01-09 Vbm Corporation Fluid operated circuit for controlling a dual post hydraulic lift assembly
GB2241936A (en) * 1990-02-08 1991-09-18 Congleton Eng Dev Improved lifting arrangement
GB2251593A (en) * 1990-12-04 1992-07-15 Linvar Ltd A platform for a boom conveyor
EP2428482A1 (en) * 2010-09-14 2012-03-14 Otto Nussbaum GmbH & Co. KG Lifting platform for motor vehicles
JP2012062199A (en) * 2010-09-14 2012-03-29 Otto Nussbaum Gmbh & Co Kg Lift
RU2577440C2 (en) * 2010-09-14 2016-03-20 Отто Нуссбаум ГМбХ и Ко.КГ Autohoist
US9637364B2 (en) 2010-09-14 2017-05-02 Otto Nussbaum Gmbh & Co. Kg Car lift for motor vehicles
CN108100920A (en) * 2018-02-08 2018-06-01 上海航空机械有限公司 A kind of synchronization lifting jack and jack hydraulic system
CN108100920B (en) * 2018-02-08 2024-05-10 上海航空机械有限公司 Synchronous lifting jack and jack hydraulic system
CN113955653A (en) * 2021-10-11 2022-01-21 中联重科建筑机械(江苏)有限责任公司 Self-climbing tower crane and multi-cylinder jacking system thereof

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