GB2428231A - Multiple lifting frame comprising locking means for securing the movement sequence of the extendable lifting masts - Google Patents

Multiple lifting frame comprising locking means for securing the movement sequence of the extendable lifting masts Download PDF

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Publication number
GB2428231A
GB2428231A GB0612579A GB0612579A GB2428231A GB 2428231 A GB2428231 A GB 2428231A GB 0612579 A GB0612579 A GB 0612579A GB 0612579 A GB0612579 A GB 0612579A GB 2428231 A GB2428231 A GB 2428231A
Authority
GB
United Kingdom
Prior art keywords
mast
lifting
primary
lifting mast
transverse bore
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
Application number
GB0612579A
Other versions
GB2428231B (en
GB0612579D0 (en
Inventor
Claudia Baumann
Martin Bickert
Klaus Rieder
Nikos Urbanczyk
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.)
Linde GmbH
Original Assignee
Linde GmbH
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 Linde GmbH filed Critical Linde GmbH
Publication of GB0612579D0 publication Critical patent/GB0612579D0/en
Publication of GB2428231A publication Critical patent/GB2428231A/en
Application granted granted Critical
Publication of GB2428231B publication Critical patent/GB2428231B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/08—Masts; Guides; Chains
    • 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
    • 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
    • B66F2700/00—Lifting apparatus
    • B66F2700/05—Hydraulic jacks
    • 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
    • B66F2700/00—Lifting apparatus
    • B66F2700/12—Lifting platforms for vehicles or motorcycles or similar lifting apparatus
    • B66F2700/126—Arrangements in which the platform is fixed to the upper end of a single or plural jacks

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Civil Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

The invention relates to a multiple lifting frame comprising a standing mast (1) and at least two lifting masts (2, 3), with which at least one lifting cylinder is associated in each case. A primary lifting mast (2) can be extended temporally before a secondary lifting mast (3) so that the movement sequence of the lifting masts (2, 3) is maintained even under unfavourable circumstances. According to the invention, mechanical locking means (8 or 11, 12 or 14a) are provided which can be brought in and out of engagement as a function of the vertical position of the primary lifting mast (2), with which - in relation to an extension of the lifting frame - the secondary lifting mast (3) can be locked relative to the standing mast (1) in an operating range between completely retracted lifting masts (2, 3) and a not completely extended primary lifting mast (2).

Description

1 2428231 Multiple lifting frame comprising locking means for securing the
movement sequence of the extendable lifting masts The invention relates to a multiple lifting frame comprising a standing mast and at least two extendable lifting masts, with which at least one lifting cylinder is respectively associated, wherein a primary lifting mast can be extended temporally before a secondary lifting mast.
In the generic lifting frames configured as a triple (Triplex") or quadruple ("Quadruplex") lifting frame, in which each lifting mast has the same lifting speed owing to the use of lifting cylinders of equal area, the extension sequence is determined exclusively by the inherent weight of the components to be lifted by the lifting cylinders. The lifting frame is designed in such a way that a specific extension sequence is maintained. Firstly, the primary lifting mast is extended as a result of the lower weight and is generally raised by two associated lifting cylinders. Only when these lifting cylinders are completely extended or the primary lifting mast impacts against a limit, do the lifting cylinders, which are connected hydraulically in series to the lifting cylinders of the primary lifting mast and are associated with the secondary lifting mast, also begin to extend as a result of the rising system pressure, and raise the latter.
Owing to the dynamic pressure in the connection lines of the lifting cylinder, it may occur, under unfavourable circumstances, in particular in the case of low oil temperatures, that the lifting cylinders of the secondary lifting mast extend first and this is unintended. This reversal of the movement sequence can also occur when the lifting frame is being retracted, but is regarded as less critical.
The present invention is based on the object of providing a multiple lifting frame of the type mentioned at the outset, in which the movement sequence is maintained even under unfavourable conditions.
This object is achieved according to the invention in that, as a function of the vertical position of the primary lifting mast, mechanical locking means, which can be brought into and ouf of engagement, are provided, with which - in relation to an extension of the lifting frame - the secondary lifting mast can be locked relative to the standing mast in an operating range between completely retracted lifting masts and a not completely extended primary lifting mast.
Owing to the locking means, an extension movement of the secondary lifting mast is prevented until the primary lifting mast is completely extended.
If is thus ensured that the movement sequence always remains the same when extending the lifting frame.
The lifting frame according to the invention can be configured both as a Triplex and as a Quadruplex lifting frame. In the latter case, three lifting masts, which can be extended from the standing mast, are provided. When extending the primary lifting mast, not only the secondary lifting mast, but also a tertiary lifting mast is therefore initially locked. Once the primary lifting mast has been completely extended, the lock of the secondary lifting mast is released, so it can be raised together with the primary lifting mast. Only when the secondary lifting mast is completely extended, is the lock of the tertiary lifting mast also released and the latter can be raised together with the other lifting masts.
In a development of the invention in an operating range, in which the primary lifting mast is completely extended, if the secondary lifting mast can be locked relative to the primary lifting mast, the movement sequence is also ensured when the lifting frame is retracted. In other words: the secondary lifting mast firstly retracts together with the primary lifting mast, with the relative position of the primary lifting mast to the secondary lifting mast not changing owing to the lock. Only when the secondary lifting mast is completely retracted, is the lock to the primary lifting mast released, so the latter can retract further. This also applies similarly to Quadruplex lifting frames, which have three lifting masts which can be extended from a standing mast.
By means of an enforced lock of the individual lifts with respect to one another, the invention thus ensures that the next lift only fakes place once the end position of the previous lift has been reached. An unintended exchange of the lifting sequence when extending and retracting the lifting frame is therefore prevented.
The locking means can be activated mechanically according to an advantageous configuration of the invention.
The secondary lifting mast in this case expediently has, in at least one vertical rail, a transverse bore, which, when the secondary lifting mast is completely retracted, is flush with a first latching recess in the standing mast, and, when the primary lifting mast is completely extended, is flush with the second latching recess in the primary liftin9 mast, a locking member being arranged in the transverse bore, the axial extent of which approximately corresponds to the sum of the axial extents of the transverse bore and one of the two latching recesses of equal length to one another.
If the primary lifting mast is not completely extended, the locking member is located in the first latching recess in the standing mast and in the transverse bore of the secondary lifting mast. The secondary lifting mast is therefore locked relative to the standing mast. When the primary lifting mast is completely extended, the second latching recess arranged therein is flush with the transverse bore in the secondary lifting mast, so the locking member can now change its position and moves into the second latching recess. In this case, the locking member is removed from the first latching recess in the standing mast and thus releases the lock of the secondary lifting mast to the standing mast. The primary lifting mast is simultaneously locked to the secondary lifting mast.
The locking member is preferably configured as a ball or roll.
Another, no less favourable configuration of the invention provides that the secondary lifting mast, in at least one vertical rail, has a transverse bore, which, when the secondary lifting mast is completely retracted, is flush with a latching recess in the standing mast, an axially displaceable bar being arranged in the transverse bore, against which bar an axially displaceable locking bolt rests so as to be loaded by spring force, the locking bolt being arranged in the latching recess and, when the primary lifting mast is not completely extended, engaging in a locking manner in the transverse bore, with the primary lifting mast having an active face which is provided to rest against the end face of the bar remote from the locking bolt and which disengages the locking bolt from the transverse bore when the primary lifting mast is completely extended.
The mode of action of this arrangement is similar to the mode of action of the embodiment variant described above. The secondary lifting mast is thus initially locked relative to the standing mast when the primary lifting mast is extended and is only released when the primary lifting mast is completely extended. A lock of the primary lifting mast relative to the secondary lifting mast is not provided in this case.
The locking means of the multiple lifting frame according to the invention may be hydraulically activated. In order to recognise whether the primary lifting mast is completely extended, the oil volume, which has flowed into the associated lifting cylinders, may be determined, for example, in this connection.
In connection with a hydraulic activation of the locking means, if is advantageous if the secondary lifting mast has a locking bore, in which a locking pin can be brought hydraulically in and out of engagement.
The locking means may also, however, be electrically activafable. The complete extension of the primary lifting mast can thus be determined via a suitable lift height sensor. The lift height sensor is in operative connection, for example, with an operating magnet.
Further advantages and details of the invention are described in more detail with the aid of the embodiments shown in the schematic figures, in which: Figure 1 shows a rear view of a multiple lifting frame according to the invention; Figure 2 shows a mechanically activated lock; Figure 3 shows a variant of a mechanically activated lock; and Figure 4 shows a plan view of a multiple lifting frame with a hydraulically activated lock.
The multiple lifting frame shown in Figure 1 is configured as a Triplex lifting frame. Accordingly, it has a standing mast 1, a primary lifting mast 2 and a secondary lifting mast 3. A fork slide 4 is mounted heightadjustably on the primary lifting mast 2. The primary lifting mast 2 is height-adjustably mounted in the secondary lifting mast 3 and is the inner mast in the present construction. The secondary lifting mast 3 is height-adjustably mounted inside the standing mast 1 designed as the outer mast.
The fork carrier 4 is raised by means of a free lift cylinder 5 arranged on the primary lifting mast 2. Two further lifting cylinders 6a, 6b raise the primary lifting mast 2. If the primary lifting mast 2 is completely extended, two further lifting cylinders 6c and 6d. which are connected hydraulically in series to the lifting cylinders 6a, 6b of the primary lifting mast 3 and each have the same cross-section as the lifting cylinders 6a, 6b, raise the secondary lifting mast 3, which extends together with the primary lifting mast 2 and the fork carrier 4.
The lifting masts 2, 3 are accordingly retracted in the reversed sequence.
Both the lifting cylinders 6a and 6b and the lifting cylinders 6c and 6d are connected hydraulically in parallel, in each case.
In order to ensure the extension sequence even in unfavourable circumstances, a mechanical lock of the secondary lifting mast 3 to the standing mast 1 is provided, which can be activated mechanically, hydraulically or electrically. Two variants of a mechanically activated lock are shown in Figures 2 and Figure 3 in each case in various connection states A, B and C. Arranged in at least one of the two vertical rails 3a of the secondary lifting mast 3 is a transverse bore 7, in which is located, in the embodiment according to Figure 2, a locking member 8 configured as a ball. When the secondary lifting mast 3 is completely retracted, the transverse bore 7 is flush with a first latching recess 9 in the adjacent vertical rail 1 a of the standing mast 1. The locking member 8, the axial extent of which approximately corresponds to the sum of the axial extents of the latching recess 9 and the transverse bore 7, is located in the first latching recess 9 of the standing mast 1 and of the transverse bore 7 of the primary lifting mast 2 when the primary lifting mast 2 is not completely extended and thus locks the secondary lifting mast 3 to the standing mast 1 (state A). The primary lifting mast 2 can move upwardly, unimpeded (arrow).
When the primary lifting mast 2 is completely extended, a second latching recess 10, which is arranged in the vertical rail 2a of the primary lifting mast 2 adjacent to the transverse bore 7 and is the same length as the first latching recess 9, is flush with the transverse bore 7, so the locking member 8 can move into the second latching recess 10 and is thus removed from the first latching recess 9 (state B). The lock of the secondary lifting mast 3 to the standing mast us therefore released.
When the lock to the standing mast 1 is released, the secondary lifting mast 3 (together with the primary lifting mast 2 and fork carrier 4) can move upwardly (state C), with a return of the locking member 8 being prevented and the primary lifting mast 2 being locked to the secondary lifting mast 3.
It is obvious that the transverse bore 7 does not absolutely have to be arranged in a vertical rail 3a of the secondary lifting mast 3. Rather, other regions of the secondary lifting mast 3 may be suitable for this function.
The embodiment shown in Figure 3 differs from the embodiment according to Figure 2 in that an axially displaceable bar ills arranged in the * transverse bore 7, against which bar the axially displaceable locking bolt 12 rests so as to be loaded by spring force, which locking bolt is arranged in the latching recess 9, and engages in a locking manner in the transverse bore 7 when the primary lifting mast 2 is not completely extended (state A).
When the primary lifting mast 2 is completely extended, an active face W of the vertical rail 2a arranged at the end of a ramp R comes to rest against the end face 1 Ia of the bar 11 remote from the locking bolt and thus disengages the locking bolt 12 from the transverse bore 7 (state B). The secondary lifting mast 3 can therefore be extended (state C). A lock to the primary lifting mast 2 does not exist in this case - unlike the embodiment according to Figure 2.
In the embodiment shown in Figure 4, a locking bore 13 is introduced into the vertical rail 3a of the secondary lifting mast 3. A locking pin 1 4a configured as a piston rod of a hydraulic cylinder 14 can be brought in and out of engagement with the locking bore 13. Activation of the doubly loadable hydraulic cylinder 14 and therefore of the locking pin 140 takes place as a function of the vertical position of the primary lifting mast 2, i.e. if the primary lifting mast 2 is not yet completely extended, the secondary lifting mast 3 is locked by the locking piston 1 4a and therefore is prevented from extending. The vertical position of the primary lifting mast 2 can be determined, for example, in that the oil flow flowing into the lifting cylinders 6a, 6b is measured.
The locking pin 1 4a can also be activated electrically, an operating magnet then being provided, for example, which is actuated as a function of signals of an electrical lift height sensor.

Claims (9)

  1. * Cl alms 1. A multiple lifting frame comprising a standing mast and at
    least two extendable lifting masts, with which at least one lifting cylinder is associated in each case, wherein a primary lifting mast can be extended temporally before a secondary lifting mast, characterised in that mechanical locking means which can be brought in and out of engagement as a function of the vertical position of the primary lifting mast are provided, with which - in relation to an extension of the lifting frame the secondary lifting mast can be locked relative to the standing mast in an operating range between completely retracted lifting masts) and a not completely extended primary lifting mast.
  2. 2. A multiple lifting frame according to claim 1, characterised in that the secondary lifting mast can be locked relative to the primary lifting mast in an operating range, in which the primary lifting mast is completely extended.
  3. 3. A multiple lifting frame according to claim 1 or 2, characterised in that the locking means, can be mechanically activated.
  4. 4. A multiple lifting frame according to claim 3, characferised in that the secondary lifting mast has a transverse bore in at least one vertical rail, which transverse bore is flush with a first latching recess in the standing mast when the secondary lifting mast is completely retracted, and, when the primary lifting mast is completely extended, is flush with a second latching recess in the primary lifting mast, a locking member being arranged in the transverse bore, the axial extent of which corresponds approximately to the sum of the axial extents of the transverse bore and one of the two latching recesses which are equal in length to one another.
    *
  5. 5. A multiple lifting frame according to claim 4, characterised in that the locking member is configured as a ball or roll.
  6. 6. A multiple lifting frame according to claim 3, characterised in that the secondary lifting mast has a transverse bore in at least one vertical rail, which transverse bore is flush with a latching recess in the standing mast when the secondary lifting mast is completely retracted, wherein an axially displaceable bar is arranged in the transverse bore, against which bar an axially displaceable locking bolt rests so as to be loaded with spring force, which locking bolt is arranged in the latching recess and, when the primary lifting mast is not completely extended, engages in the transverse bore in a locking manner, wherein the primary lifting mast has an active face provided to rest against the end face of the bar remote from the locking bolt, the active face disengaging the locking bolt from the transverse bore when the primary lifting mast is completely extended.
  7. 7. A multiple lifting frame according to claim 1, characterised in that the locking means can be hydraulically activated.
  8. 8. A multiple lifting frame according to claim 7, characterised in that the secondary lifting mast has a locking bore, in which a locking pin can be brought in and out of engagement hydraulically.
  9. 9. A multiple lifting frame according to claim 1, characterised in that the locking means can be activated electrically.
GB0612579A 2005-07-12 2006-06-26 Multiple lifting frame comprising locking means for securing the movement sequence of the extendable lifting masts Expired - Fee Related GB2428231B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005032390A DE102005032390A1 (en) 2005-07-12 2005-07-12 Multiple mast with locking means to secure the sequence of movement of the extendable masts

Publications (3)

Publication Number Publication Date
GB0612579D0 GB0612579D0 (en) 2006-08-02
GB2428231A true GB2428231A (en) 2007-01-24
GB2428231B GB2428231B (en) 2008-10-01

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ID=36803859

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0612579A Expired - Fee Related GB2428231B (en) 2005-07-12 2006-06-26 Multiple lifting frame comprising locking means for securing the movement sequence of the extendable lifting masts

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DE (1) DE102005032390A1 (en)
GB (1) GB2428231B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007062491A1 (en) 2007-12-22 2009-06-25 Linde Material Handling Gmbh Lifting device for industrial truck, has lifting cylinders pressure impinged by control valve, where flow cross section of valve is downsized at low temperatures, and expandable and retractable sequences of cylinders are maintained
DE102008013765A1 (en) 2008-03-12 2009-09-17 Linde Material Handling Gmbh Device for securing the sequence of movements of at least two fluid-operated displacement units
DE102012101236A1 (en) 2012-02-16 2013-08-22 Linde Material Handling Gmbh Mast of a truck
CN103523706A (en) * 2013-09-18 2014-01-22 济南华北升降平台制造有限公司 Wall-mounted type multiple-cylinder lifting platform
CN112850571A (en) * 2021-02-08 2021-05-28 安徽合力股份有限公司 Three-level full-freedom portal frame with grading lifting function and forklift

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1330647A (en) * 1969-12-30 1973-09-19 Bushnell S W Multistage lift
SU887450A1 (en) * 1979-12-27 1981-12-07 Предприятие П/Я В-2330 Telescopic hoist
SU1388591A1 (en) * 1986-02-11 1988-04-15 Предприятие П/Я А-1923 Multistage telescopic hydraulic cylinder
DE29824867U1 (en) * 1997-05-28 2003-03-06 Demag Mobile Cranes Gmbh & Co Crane with telescopic boom - has individual sections movable by hydraulic piston cylinder unit whose displaceable element has at inner and outer ends security locking units to couple with recesses in telescopic sections

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1330647A (en) * 1969-12-30 1973-09-19 Bushnell S W Multistage lift
SU887450A1 (en) * 1979-12-27 1981-12-07 Предприятие П/Я В-2330 Telescopic hoist
SU1388591A1 (en) * 1986-02-11 1988-04-15 Предприятие П/Я А-1923 Multistage telescopic hydraulic cylinder
DE29824867U1 (en) * 1997-05-28 2003-03-06 Demag Mobile Cranes Gmbh & Co Crane with telescopic boom - has individual sections movable by hydraulic piston cylinder unit whose displaceable element has at inner and outer ends security locking units to couple with recesses in telescopic sections

Also Published As

Publication number Publication date
GB2428231B (en) 2008-10-01
GB0612579D0 (en) 2006-08-02
DE102005032390A1 (en) 2007-01-18

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Legal Events

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732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20140626