EP0344252A1 - Device for displacing a first part relative to a second part - Google Patents
Device for displacing a first part relative to a second partInfo
- Publication number
- EP0344252A1 EP0344252A1 EP19880910177 EP88910177A EP0344252A1 EP 0344252 A1 EP0344252 A1 EP 0344252A1 EP 19880910177 EP19880910177 EP 19880910177 EP 88910177 A EP88910177 A EP 88910177A EP 0344252 A1 EP0344252 A1 EP 0344252A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- arrangement
- engagement
- mechanisms
- cylinder
- 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.)
- Granted
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
Definitions
- the device in question is preferably a lifting device, in which case ' the second part forms a base part whereas the first part is designed for abutment against or connection to objects to be lif ⁇ ted.
- the lifting device is in particular adapted for vehicles .
- the cylinders are fixedly secured to the second part and connected by lines to a power exerting arrangement for delivering fluid under pressure and also fixedly secured to the second part.
- the tensile force transmitting arrangement comprises two telescopic supports, which act between the first and second parts and which may be fixed as to their ad ⁇ justed length by means of locking pins.
- the first part is described as being attached, for instance by welding, to the upper elements of the telescopic supports.
- the object of the present invention is ⁇ .o devise ways to reduce the amount of time and work necessarv when service has to be carried out of the piston cylinder mechanism in such devices, wherein the cylinder of the mechanism is fixedly secured to the second part.
- the piston may freely be withdrawn from the cylinder without additional measures for dismantling the piston cylinder mechanism after having released the first part from the piston and moved it sidewardly out of the path for withdrawal of the piston. Furthermore, there is no need to carry out any dismant ⁇ ling of the tensile force transmitting arrangement since it is so arranged that its engagement members may maintain their mutual engagement when the first part is lifted off of the piston and moved sidewardly.
- the invention presupposes a piston cylinder design, in which the piston may be withdrawn from the cylinder without dismantling thereof, for instance by the portion of the piston received in the cylinder having generally uniform cross sections.
- Fig 1 is a perspective overall view of the device accordin to the invention
- fig 2 is a section viewed along the line II-II ' in fig 1;
- fig 3 is a view similar to fig 2 but illustrating the first part disengaged from the piston of the piston cy ⁇ linder mechanism and moved sidewardly for allowing ith ⁇ drawal of the piston;
- fig 4 is a partly cut view of the device viewed from above, the first part and certain further components of the device having been eliminated for clarity;
- fig 5 is a partly cut view taken along the line V-V in fig 4.
- the device according to the invention comprises in prac ⁇ tice two piston cylinder mechanisms 1 arranged to provide displacement of a first part 2 relative to a second part 3.
- the latter part forms a base part whereas the first part 2 is designed for abutment against objects to be lifted.
- the device will be described as a vehicle lifting device.
- the base part 3 has an elon ⁇ gated shape and comprises at its ends means 4 known per se for supporting base part 3 on suitable supports, e.g. upwardly projecting edge flanges of spaced tracks.
- the part 3 comprises two mutually spaced beams 5, 6, which in the embodiment are hollow and telesc ⁇ pically receive beams 7 contained in means 4 so that the space therebet ⁇ ween may be adjusted as desired.
- the first part 2 comprises an elongated beam 8, which is in releasable force transmitting engagement with the pistons 9 of mechanisms 1. More specifically, the pistons have as appears from fig 3 a flat end portion 10 projecting into a respective recess 11 in beam 8.
- the means for engagement between oistons 9 and beam 8 are so d sig that pistons 9 may apply lifting forces on beam 8 but the latter is prevented from moving perpendicularly to the ⁇ axi.al direction of mechanisms 1.
- Beam 8 receives telescopically components 12 having at their extreme ends members 13 for suitable supporting contact with vehicles. The members 13 are preferably replacable so that such may always be chosen which are best suitable for the vehicle in question.
- pistons 9 project through the lower wall portion 14 of the hollow beam 8 and also through the interior of the beam.
- Components 12 comprise two interconnected and spaced plates receivable in beam 8 so that these two plates will be located on either sides of the portion of the respective piston 9 present within hollow beam 8. Adjacent to the recesses 11 suitable reinforcements may if needed be arranged within hollow beam 8 and the pistons abut with their shoulders 14 against these rein ⁇ forcements .
- the cylinders 15 of the mechanisms are rigidly attached to beams 5, 6 of part 3 by means of plate shaped pieces
- the cylinders 15 are more specifically attached to beams 5, 6 so as to extend vertically therebetween.
- Means are provided for restricting extensioning of mecha ⁇ nisms 1.
- Said means form more specifically arrangements 17 acting tensile force transmitting between part 2 and cylinders 15 when pistons 9 have been pushed out to a maximally allowed extent and by said tensile force trans ittance preventing continued pushing of the piston outwardly.
- the arrangements 17 comprise each in the em ⁇ bodiment a first member 18 connected to part 2 and a member 19 attached to the cylinder. These two members 18, 19 engage limitedly displacable with each other since member 18 defines a space 20 having an elongated extent in the direction of expansion of mechanism 1 , said space -receiving member 19, which has the character of a pro ⁇ jection received in space 20 and attached exteriorly of cylinder 15.
- Member 18 has preferably the character of a yoke, the legs of which are secured to part 2 and the base of which serves for movement restricting abutment against the projection 19. '
- Each mechanism 1 is so designed that the portion of piston 9 intended to be received in cylinder 15 has generally uniform cross sections as indicated in fig 3. More spe ⁇ cifically, the portion of piston 9 receivable in cylinder 15 is in the embodiment entirely cylindrical, which means that piston 9 in a non-expensive manner may be manufactur starting from rod material with necessary diameter. Cy ⁇ linder 15 has its interior chamber designed with one and the same diameter from the end of the cylinder, where the piston enters, and to the bottom of the chamber, i.e. the end wall of the cylinder. The only exception is possible ring shaped recesses for housing required sealings 21 adjacent to the open end of the cylinder.
- Lines or conduits 22 and 23 are connected to cylinders 15 and communicate via holes in their walls with the chambers within the cylinders.
- pressurized fluid may flow to and from the space between the bottoms of the cylinders and the adjacent piston end via the small clearing present between the pistons and the cylinder walls .
- the tensile force transmitting arrangements 17 are adapte to allow disengagement of part 2 from the pistons and such movement of part 2 that, as appears from fig 3, pistons 9 are set free to be drawn out of the cylinders, such withdrawal freely being possible without additional measures for dismantling mechanisms 1 due to the uniform cross sections of the portions of the ⁇ istons received in the cylinders. More specifically, part 2 is loosely laid on to piston ends 10, 1 in normal operation so that when pistons 9 are lowered relative to their uppermos position, part 2 may be lifted off the pistons and dis ⁇ placed sidewardly to the position according to fig 3. Part 2 could of course also be displaced to a removed position, in which part 2 is located to the left of pis ⁇ tons 9 as the device is viewed in fig 3.
- a guide arrangement 24 for avoiding mutual inclination of parts 2 and 3 acts therebetween.
- This guide arrange ⁇ ment is of a mechanical nature and ensures that parts 2 and 3 are held correctly orientated relative to each other even if mechanisms 1 would get in inbalance, e.g. by minor fluid leakage, jamming or the like.
- the guide arrangement comprises a shaft 25 ro- tatably supported on part 3 and two spaced arms 26 rigid ⁇ ly secured to said shaft, said arms engaging at a distance from shaft 25 with part 2 such that shaft 25 will be rotated on elevation and lowering of part 2.
- arms 26 comprise engagement means 27 engaging with corresponding engagement means on part 2, said engagement means being so designed that they allow arms 26 to carry out their arcuate movement although part 2 moves up and down in one and the same plane.
- the engagement means 27 on arms 26 are designed as projections, which are received in slots
- the shaft 25 is with its ends rotatably supported in the plates 16 also connecting beam 6 to cylinders 15.
- the device comprises a power exerting arrangement gene ⁇ rally denoted 30 for supplying fluid under pressure to mechanisms 1.
- this arrang ment comprises a fluid pump 31 with a cylinder 32 and a piston 33 received therein.
- the arrangement 30 comprises a cylindrical housing 34 and two end walls 35, 36. Tie rods 37, in the embodiment four, press end walls 35 and 36 towards each other so that cylinder housing 34 is locked therebetween.
- Fluid pump has its cylinder 32 sealingly inserted into a recess
- a space 40 serving as a pressure fluid reservoir.
- the pressure fluid is more specifically formed by r hydraulic fluid, which is also the fluid delivered to mechanisms 1.
- Piston 33 of pump 31 is connected to second piston 41 having a considerably larger diameter and sealingly ad ⁇ joining to the inside of cylinder housing 34 while defining two chambers 42 and 43 respectively on either sides thereof.
- Pressure fluid conduits 44 and 45 respec ⁇ tively run to chambers 42 and 43, said conduits being connected to a valve 46, to which also a pressure fluid supply conduit 47 is connected.
- the pressure fluid for bringing piston 41 in movement is preferably pressurized air.
- conne tion 64 which is diagrammatically indicated in fig 4 and which in practice preferably opens into the reser ⁇ voir above the fluid level therein.
- End wall 35 comprises a channel 49, which communicates with recess 38 and in which there is provided a non ⁇ return valve 50 closing against flow in a direction to ⁇ wards recess 38, the degree of opening of said valve preferably being controlled by means of a control member indicated in fig 5.
- Fluid from space 38 is intended to flow to mechanisms 1 via channel 49 and non-return valve 50.
- a further channel 48, 66, 65 serving for return flow of hydraulic fluid from mechanisms 1 to reser voir 40.
- This channel is more specifically formed by a channel portion 65, a space 66 and a connection 48 between the same and reservoir 40.
- a valve 53 controllable by means of an ope ⁇ rating member 52, said valve thus being openable for hydraulic fluid return by means of operating member 52.
- Operating member 52 may preferably comprise a threaded portion engaging with an internal thread in space 66.
- a channel 51 is connected to channel 48, 66, 65 down ⁇ stream of valve 53 as concerns the direction of flow for return, said channel 51 extending to space 38 and having a non-return valve 54 arranged therein, which opens in the direction towards space 38.
- Channel 49 opens at its end turned away from space 38 into an opening 55 in end wall 35.
- the conduits 22 and 23 extending to mechanisms 1 have their ends directed away from the mechanisms .attached, e.g. welded, to an attachment member 56.
- conduit 23 is supported by means of a carrying member 57, e.g. by the conduit passing through a hole there ⁇ in.
- Carrying member 57 has the character of a plate se ⁇ cured to beam 5.
- a connecting element 58 arranged for mechanical intercon ⁇ nection of arrangement 30 and beam 5 of part 3 is also arranged to establish, in its connecting state, fluid communication between arrangement 30 and conduits 22, 23 in that connecting element 58 comprises an internal fluid channel 59. More specifically, connecting element
- the internal channel 59 in screw 58 has an axial portion and a transverse portion communicating therewith, the transverse portion opening into a widened part of hole 60 in attachment member 56 between two portions 61 arranged on screw 58 and having larger diameter than the portion, wherein the transverse portion of channel 59 opens.
- openings 62 see fig 4
- conduits 22 and 23 communicate with hole 60 opposite to the widened hole portion, in which the transverse portion of channel
- Screw 58 is provided with a widened head abuttin against attachment member 56 on the side thereof turned away from end wall 35.
- the arrangement 30 is received between beams 5 and 6 and also between mecha ⁇ nisms 1, which results in a very comoact embodiment.
- the mechanical connection of arrangement 30 relative to beam 5 obtained by screw 58 should preferably be supplemented with any further mechanical connection devic In the embodiment this has been realized in that a lower of the tie rods 37 (fig 4) -comprises an extended por ⁇ tion protruding through a hole in carrying member 57. Nuts 63 engage with the thread of tie rod 37 and fix the tie rod and accordingly the entire arrangement 30 relative to carrying member 57.
- valve 46 When there is a need for elevating part 2 relative to part 3, valve 46 is operated so that pressurized air is introduced into chamber 42 and further via channel 64 to reservoir 40.
- the piston 41 now moves to its right end position in fig 4 and at the same time an overpressure is created above the fluid level in reservoir 40.
- This overpressure forces fluid to pass via connection 48, space 66, channel 51, valve 54, space 38, channel 49, valve 50, opening 55 and connecting element 58 to mecha ⁇ nisms 1.
- Pistons 9 and part 2 now move outwardly into contact with the object to be lifted; the lifting force is restricted to the overpressure present in reservoir 40.
- pressurized air is supplied to chamber 43 via conduit 45 at the same time as chamber 42 is deaj rated via conduit 44.
- Pistons 41 and 33 now pump liquid from cylinder 32 to mechanisms 1, the liquid passing via channel 49 and valve 50.
- the overpressure in mechanisms 1 and accordingly the lifting force now increase in proportion to the difference in area between pistons 41 and 33.
- valve 46 By reversing valve 46, the pumping operation may be repeated a desired number of times.
- the operating arm on valve 46 is released, it is automatically returned to a neutral position, where ⁇ by chambers 42 and 43 are deairated and the inlet 47 on the valve blocked.
- the load on pistons 9 is now entirel carried on the hydraulic fluid enclosed in cylinders 15 in that valves 50 and 53 are closed.
- valve 53 is opened by screwing operating member 52 and accordingly its valve spindle outwardly. Hydraulic fluid may now flow back from the mechanisms 1 to reservoir 40 via connecting element 58, channel 49, channel portion 65, valve 53, space 66 and connection 48, the part 2 returning to its lowest posi ⁇ tion due to its own weight.
- pistons 9 When there is a need for service on mechanisms 1 , pistons 9 are lowered at least somewhat from their upper posi ⁇ tions so that part 2 may be lifted off the pistons and be moved sidewardly to the position according to fig 3. Thereafter pistons 9 may freely be drawn out of the cylinders without any other dismantling measures and e.g. the sealings 21 may be replaced. Subsequently, the pistons 9 may easily be introduced into the cylinders and part 2 again put in place. It is of course essential t the engagement between projections 27 and slots 28 as well as between yoke 18 and projection 19 is so designed that the movement sidewardly of part 2 to the position according to fig 3 is allowed without having to release said engagement.
- conduits 44, 45 are released therefrom, which is easily carried out by means of quick couplings. Thereafter the one visible to the right in fig 4 of the nuts 63 is released and finally screw 58 is screwed out, where ⁇ upon arrangement 30 after some displacement to the left in fig 4 is entirely disengaged. On mounting one proceeds in analogous, reversed manner.
- the invention is of course not only restricted to the embodiment illustrated. For instance, it is not necessary to use two piston cylinder mechanisms but only one as used.
- the movement restricting arrangement 17 may not necessarily have the character of co-operating yoke and projection but instead other arrangements with such tensile force transmitting function that they restrict extension of mechanisms 1 to a maximum value .could be. used. It is to be mentioned that the projections 19 or other correspondinq components may be arranged directly on part 3 as well as on cylin ⁇ ders 15.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Actuator (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8704618 | 1987-11-23 | ||
SE8704618A SE459806B (en) | 1987-11-23 | 1987-11-23 | DEVICE FOR TRANSMISSION OF A FIRST PART RELATIVELY ANOTHER PART |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0344252A1 true EP0344252A1 (en) | 1989-12-06 |
EP0344252B1 EP0344252B1 (en) | 1994-03-16 |
Family
ID=20370339
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880910177 Expired - Lifetime EP0344252B1 (en) | 1987-11-23 | 1988-11-14 | Device for displacing a first part relative to a second part |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0344252B1 (en) |
CA (1) | CA1296706C (en) |
DE (1) | DE3888524D1 (en) |
SE (1) | SE459806B (en) |
WO (1) | WO1989004808A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4135193C1 (en) * | 1991-10-22 | 1993-03-11 | Schering Ag Berlin Und Bergkamen, 1000 Berlin, De |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1239648A (en) * | 1916-08-02 | 1917-09-11 | Gen Electric | Air-starting system for internal-combustion engines. |
US2307328A (en) * | 1941-04-19 | 1943-01-05 | Otis C Martin | Swivel fitting |
SE393850B (en) * | 1975-07-10 | 1977-05-23 | J Claren | PIPE CONNECTION CONNECTION WITH A CONNECTION PIECE AND A DEVICE FOR CONNECTING A PIPELINE TO A CHANNEL IN THE CONNECTION PIECE |
DE3136242A1 (en) * | 1981-09-12 | 1983-03-31 | Reinhold 3414 Hardegsen Fischer | Single-track approach platform |
-
1987
- 1987-11-23 SE SE8704618A patent/SE459806B/en not_active IP Right Cessation
-
1988
- 1988-11-14 DE DE88910177T patent/DE3888524D1/en not_active Expired - Lifetime
- 1988-11-14 EP EP19880910177 patent/EP0344252B1/en not_active Expired - Lifetime
- 1988-11-14 WO PCT/SE1988/000607 patent/WO1989004808A1/en active IP Right Grant
- 1988-11-22 CA CA000583738A patent/CA1296706C/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO8904808A1 * |
Also Published As
Publication number | Publication date |
---|---|
SE459806B (en) | 1989-08-07 |
WO1989004808A1 (en) | 1989-06-01 |
CA1296706C (en) | 1992-03-03 |
SE8704618D0 (en) | 1987-11-23 |
SE8704618L (en) | 1989-05-24 |
EP0344252B1 (en) | 1994-03-16 |
DE3888524D1 (en) | 1994-04-21 |
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