EP0415687A1 - Châssis de levage - Google Patents

Châssis de levage Download PDF

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Publication number
EP0415687A1
EP0415687A1 EP90309357A EP90309357A EP0415687A1 EP 0415687 A1 EP0415687 A1 EP 0415687A1 EP 90309357 A EP90309357 A EP 90309357A EP 90309357 A EP90309357 A EP 90309357A EP 0415687 A1 EP0415687 A1 EP 0415687A1
Authority
EP
European Patent Office
Prior art keywords
piston
hydraulic
cylinder assembly
jacking apparatus
pneumatic
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.)
Withdrawn
Application number
EP90309357A
Other languages
German (de)
English (en)
Inventor
Ernest Holland
Peter Simpson Kirkwood Grossart
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.)
VL Churchill Ltd
Original Assignee
VL Churchill 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 VL Churchill Ltd filed Critical VL Churchill Ltd
Publication of EP0415687A1 publication Critical patent/EP0415687A1/fr
Withdrawn legal-status Critical Current

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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
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/065—Scissor linkages, i.e. X-configuration
    • 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
    • B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
    • B66F7/08—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated

Definitions

  • the jacking apparatus may be a pit jack for use in supporting a vehicle over an inspection pit or may take other forms.
  • the hydraulic intensifier has hitherto been too large to produce a convenient and compact jacking device. This is because the quantity of fluid to be pumped is related to the stroke of the hydraulic piston and cylinder assembly and of the pneumatic piston and cylinder assembly which drives it.
  • a jacking apparatus comprising an hydraulic lifting ram adapted to lift a structure, and a pneumatic/hydraulic intensifier adapted to supply high pressure hydraulic fluid to said ram to operate it, the intensifier comprising a large diameter pneumatic piston and cylinder assembly and a small diameter hydraulic piston and cylinder assembly operable by the pneumatic piston, wherein at least one piston and cylinder assembly of the intensifier is double-acting.
  • double-acting in this description means that fluid is pumped by the piston and cylinder assembly in both directions of reciprocating travel of the piston.
  • both the hydraulic and pneumatic assemblies are double-acting.
  • the jacking apparatus may comprise a scissor operating lifting beam.
  • the pneumatic/hydraulic intensifier may be provided between the arms of the scissor in the lowered condition.
  • a manually operated directional control valve may be used to supply air to the pneumatic piston and cylinder assembly.
  • an automatic change-over valve may be provided to supply air to the pneumatic piston and cylinder assembly.
  • a jacking device generally indicated at 10 is intended to raise a beam 11 which in turn supports a load.
  • the jack is intended to support a vehicle over an inspection pit and is provided with roller wheels of generally known type which run on rails provided along the inspection pit opening. These details are not shown in the drawings.
  • the beam 11 has side extensions 11a telescopically arranged so as to extend the effective width of the beam.
  • the beam 11 is lifted by a scissor linkage comprising a pair of crossing scissor arms 12 and 13 linked by a pivot 14.
  • the arms 12 and 13 can be moved by a generally conventional angled hydraulic ram 15 which is attached at 16 and 17 to the limbs 12 and 13 respectively. It will be appreciated that, as the ram 15 extends, the limbs 12 and 13 pivot about the point 14 and raise the beam 11 in generally known manner.
  • Hydraulic fluid is supplied to the ram 15 from a small diameter hydraulic piston and cylinder assembly 18. This forms one element of a pneumatic/hydraulic intensifier, the other element being a pneumatic piston and cylinder assembly 19.
  • the hydraulic assembly has a piston 20 which is driven by a rod 21 secured to the piston 22 of the pneumatic assembly.
  • the pneumatic piston and cylinder assembly is of large diameter compared with that of the hydraulic assembly. This means that the pressure of hydraulic fluid is multiplied by the ratio of the piston areas, compared with the pressure of the air operating the pneumatic piston and cylinder assembly, in generally known manner.
  • the hydraulic piston 20 has a central passageway 23 which is closed by a ball valve 24.
  • the ball valve controls a passageway through which hydraulic fluid can be pumped to the ram 15.
  • a valve block shown in Figure 2 of the drawings is used to direct hydraulic fluid through pipework (not shown) to the ram 15.
  • compressed air is introduced by a manually controlled directional valve (not shown) at the right-hand end 25 of the pneumatic piston and cylinder assembly. This causes the piston 22 to travel towards the left, pushing the rod 21 and hence the piston 20. As the piston 20 moves up the hydraulic cylinder, the ball valve 24 opens, forcing compressed hydraulic oil into the space 26 behind the piston 20.
  • This oil passes through a pressure openable ball valve 27 and passageways 28 to a hydraulic hose 29 connected to the ram 15.
  • Hydraulic fluid is supplied from a reservoir 31 forming a jacket around the cylinder 18 through a demand valve (not shown) to replenish the oil in the cylinder.
  • Hydraulic oil at the right-hand side of the piston 20 is forced into the space 26, since it cannot return through the closed valve 24, and is also pumped through the valve 27 and passageways 28 to the supply hose 29 and hence to the ram 15.
  • the directional control valve can be repeatedly operated to supply air firstly to the right-hand and then to the left-hand end of the pneumatic cylinder and this will cause stepwise operation of the ram 15 until the limit of its travel is reached.
  • a mechanical lock is then provided to support the beam 11 in its fully lifted condition so as to prevent sudden dropping of the beam in the event of hydraulic failure. This is provided by a peg 32 running in a cranked slot 33 of the scissor linkage.
  • Lowering of the beam may be achieved by a manually operated exhaust valve which releases hydraulic pressure in the ram 15 and returns the hydraulic fluid to the reservoir 31.
  • the pneumatic cylinder could have an associated change-over valve to direct compressed air to the appropriate end of the cylinder to continue lifting.
  • the change-over valve can be controlled by suitable mechanical switches detecting limit positions of the pneumatic piston for example.
  • the manual control valve is then only required to switch on and off the air supply.
  • valve 34 is a pressure relief valve of generally known type operable on excess pressure being built up in the region 26.
  • the valve operates to return hydraulic oil to the reservoir 31 in the event of a pressure overload.
  • the intensifier comprising the assemblies 18 and 19 can be housed compactly within the scissor linkage in its lowered condition, as shown. This enables the jacking device to be made very compact while permitting adequate lifting of the beam 11.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Actuator (AREA)
EP90309357A 1989-08-26 1990-08-25 Châssis de levage Withdrawn EP0415687A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898919468A GB8919468D0 (en) 1989-08-26 1989-08-26 Jacking apparatus
GB8919468 1989-08-26

Publications (1)

Publication Number Publication Date
EP0415687A1 true EP0415687A1 (fr) 1991-03-06

Family

ID=10662190

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90309357A Withdrawn EP0415687A1 (fr) 1989-08-26 1990-08-25 Châssis de levage

Country Status (2)

Country Link
EP (1) EP0415687A1 (fr)
GB (2) GB8919468D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523434A1 (fr) * 1991-07-13 1993-01-20 Hydraulik Techniek Organe de positionnement actionné par pression, en particulier pour un dispositif de levage, de halage et de poussage
IT201700056306A1 (it) * 2017-05-24 2018-11-24 O Me R Spa Ponte sollevatore

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5868379A (en) * 1996-01-25 1999-02-09 Rite-Hite Holding Corporation Safety stand for trailer loading
US7914042B2 (en) 2008-05-13 2011-03-29 Rite-Hite Holding Corporation Support frame vehicle restraints
US8528929B2 (en) 2010-01-21 2013-09-10 Midwest Industrial Door, Inc. Trailer docking repositionable support
CA2795971C (fr) 2010-05-19 2016-11-01 Midwest Industrial Door, Inc. Stabilisateur de remorque
CA2895992C (fr) 2014-07-01 2020-07-21 Stabilock, LLC Dispositif de stabilisation et de retenue de remorque

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1075780A (fr) * 1952-04-26 1954-10-20 Perfectionnements aux pompes différentielles
GB1232983A (fr) * 1967-07-11 1971-05-26
FR2228389A5 (en) * 1973-05-02 1974-11-29 Hale Jean Claude Spray pump for low viscosity lubricant - piston has low pressure and differential high pressure portions
FR2480873A1 (fr) * 1980-04-22 1981-10-23 Toyooki Kogyo Kk Systeme hydro-pneumatique pour l'entrainement d'un dispositif de manoeuvre hydraulique
CA1120379A (fr) * 1980-09-25 1982-03-23 Argo Engineering Ltd. Systeme oleopneumatique composite pour installation de mise a quai
GB2091346A (en) * 1981-01-12 1982-07-28 Camtorc Ltd Valve Actuator
DE8609199U1 (de) * 1986-04-05 1989-05-11 Samarit Medizintechnik AG, Zug Vorrichtung mit einem ersten und einem zweiten Rahmen, wobei beide Rahmen über scherenartig gekoppelte Elemente miteinander verbunden sind

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB791466A (en) * 1955-03-17 1958-03-05 Weber Emil Improvements in or relating to hydraulically-operated double-acting pushing jacks for the displacement of equipment, for example conveyors, in mineral workings
GB910542A (en) * 1960-10-13 1962-11-14 Castrol Equipment Ltd Improvements in or relating to power operated hydraulic jacks

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1075780A (fr) * 1952-04-26 1954-10-20 Perfectionnements aux pompes différentielles
GB1232983A (fr) * 1967-07-11 1971-05-26
FR2228389A5 (en) * 1973-05-02 1974-11-29 Hale Jean Claude Spray pump for low viscosity lubricant - piston has low pressure and differential high pressure portions
FR2480873A1 (fr) * 1980-04-22 1981-10-23 Toyooki Kogyo Kk Systeme hydro-pneumatique pour l'entrainement d'un dispositif de manoeuvre hydraulique
CA1120379A (fr) * 1980-09-25 1982-03-23 Argo Engineering Ltd. Systeme oleopneumatique composite pour installation de mise a quai
GB2091346A (en) * 1981-01-12 1982-07-28 Camtorc Ltd Valve Actuator
DE8609199U1 (de) * 1986-04-05 1989-05-11 Samarit Medizintechnik AG, Zug Vorrichtung mit einem ersten und einem zweiten Rahmen, wobei beide Rahmen über scherenartig gekoppelte Elemente miteinander verbunden sind

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
POWER INTERNATIONAL, vol. 33, no. 387, 1987, pages 100-103, Morden, Surrey, GB; "Air driven compound hydraulic pumps" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0523434A1 (fr) * 1991-07-13 1993-01-20 Hydraulik Techniek Organe de positionnement actionné par pression, en particulier pour un dispositif de levage, de halage et de poussage
IT201700056306A1 (it) * 2017-05-24 2018-11-24 O Me R Spa Ponte sollevatore

Also Published As

Publication number Publication date
GB9018744D0 (en) 1990-10-10
GB8919468D0 (en) 1989-10-11
GB2237329A (en) 1991-05-01

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