US3895778A - Method of lowering and raising loads by means of a jack assembly and lifting element - Google Patents

Method of lowering and raising loads by means of a jack assembly and lifting element Download PDF

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Publication number
US3895778A
US3895778A US321154A US32115473A US3895778A US 3895778 A US3895778 A US 3895778A US 321154 A US321154 A US 321154A US 32115473 A US32115473 A US 32115473A US 3895778 A US3895778 A US 3895778A
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United States
Prior art keywords
lifting element
jack
lowering
load
jack assembly
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Expired - Lifetime
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US321154A
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English (en)
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Nils Harald Ahlgren
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
    • E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
    • E02B17/0836—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with climbing jacks
    • E02B17/0881—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with climbing jacks with following nuts
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
    • E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
    • E02B17/0836—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with climbing jacks

Definitions

  • ABSTRACT ln a method of lowering and raising loads by means of a jack assembly and lifting element the load is transferred from the lifting element by supporting means disposed on the lifting element and having a crosssection considerably larger than that of the lifting element.
  • the supporting means are alternately carried by preferably dismountable carrying members with holes for the lifting element, which holes are smaller than the cross-section of the supporting means, the carrying members being mounted on relatively movable parts of the jack assembly.
  • This invention relates to a method of lowering and raising a load by means of a jack assembly and lifting element in which the load is transferred from the lifting element by supporting means movable along said element and having a cross-section considerably larger than that of the lifting element.
  • the supporting means are alternately carried by preferably dismountable carrying members with holes for the lifting element, which holes are smaller than the cross-section of the supporting means, said carrying members being mounted on relatively movable parts of the jack assembly.
  • the inven tion permits the use of a simple equipment in lowering and raising loads and simultaneously makes it possible to perform the lowering and raising operation with the utmost safety.
  • the invention also relates to a method of lowering loads by means of an operating cylinder hydraulic jack assembly and lifting element.
  • the hydraulic jack assembly is wholly or partly relieved of load by part of the pressure medium in the operating cylinder being led to a lateral chamber communicating with the jack assembly, and the same amount of pressure medium is returned from the lateral chamber to the operating cylinder of the jack assembly in the next operating cycle.
  • the present invention further relates to a method of lowering rigid loads by means of a plurality of hydraulic jack assemblies and pertaining lifting elements, wherein the hydraulic systems of the different jack assemblies are interconnected so that a uniform distribution and lowering, respectively, of the load is realized.
  • FIG. 1 is a side view of one of the jack assemblies cooperating with a lifting element
  • FIG. 2 is a side view of another of the jack assemblies co-operating with a lifting element
  • FIG. 3 is a plan view of the jack assembly in FIG. 2;
  • FIGS. 4a 4e are views illustrating step by step the lowering of a load by means of a jack assembly comprising two hydraulic jacks;
  • FIGS. 5a 5g are diagrammatic views illustrating step by step the lowering of a load by means of a plurality of interconnected hydraulic jack assemblies
  • FIGS. 6a 6e are views illustrating step by step the lowering method of the invention with the use of a modified embodiment of the jack assembly shown in FIG. 4.
  • the jack assembly illustrated in FIG. 1 comprises a jack 1 and spacing means 2.
  • the jack 1 which is preferably hydraulic is composed of a piston unit 3 and a cylinder unit 4 which serves as a fixed part.
  • the spacing means 2 has its upper end portion 5 connected to the fixed part 4 of the jack I while it rests with its lower end portion 6 against a fixed base 7.
  • the load is applied to a lifting element which is in the form of a lifting rod 8.
  • the load is to be transferred from said rod by supporting means 9 and 10 shiftable along the rod and having a cross-section considerably larger than that of the lifting rod 8.
  • the supporting means 9 and 10 are adapted to be alternately carried by dismountable carrying members 11 and 12 which are formed with holes for the lifting rod 8, said holes being smaller than the cross-section of the supporting means 9 and 10.
  • the carrying member 11 is adapted to co-operate with the piston unit 3 while the carrying member 12 is adapted to co-operate with the spacing means 2 at or in proximity to the lower end portion 6 thereof.
  • the lifting rod 8 takes part in the upward movement of the piston unit because the supporting means 9 rests against the carrying member 11.
  • the supporting means 10 is moved into engagement with the carrying member 12 whereupon the piston unit 3 is allowed to return to its bottom position.
  • the supporting means 9 is again brought into engagement with the carrying member 11 by being shifted along the rod 8 to effect continued raising of the load.
  • the rod 8 preferably has a thread of large pitch, and upon rotation the supporting means 9 and 10 are movable in the manner of nuts along therod 8.
  • the supporting means 9 and 10 may be connected to springs or like means which are activated when the supporting means 9 and 10 are moved relative to the carrying members 11 and 12 and which move the supporting means 9 and 10 along the lifting rod 8 when they. are relieved of load.
  • the lifting rod 8 is adapted to be joined to other rod lengths by means of joining pieces 13 of larger crosssection than that of the lifting rod 8.
  • the jack 1 and the spacing means 2 must therefore be provided with wide passages 14 for the lifting rod 8. Besides, it must be possible to dismount the carrying members 11 and 12 alternately so as to allow free passage of the lifting rod joining pieces 13.
  • the piston unit 3 and the spacing means 2 are provided with upper and lower positions for the carrying members 11 and 12, the choice of position being determined by the point at which the joining piece 13 is situated so that the joining piece 13 does not disturb the raising or lowering movement.
  • the spacing means 2 is adapted to rest on the fixed base 7, the lower end portion 6 being rounded in such a way as to permit angular changes in relation to the base 7.
  • the spacing means 2 may be adapted to rest on the fixed part 4 of the jack 1 with its lower end portion 6, in which case the carrying member 12 co-operates with the upper end portion 5. Between said end portions 5 and 6 the spacing means 2 in any circumstances is so shapedas to permit the requisite shifting of the carrying member 12.
  • the jack assembly shown in FIGS. 2 and 3 comprises two co-operating hydraulic jacks 21 and 22.
  • the relatively movable parts of the jack assembly, on which parts the carrying members are mounted, comprise the piston units 23 and 24 in the jacks 21 and 22.
  • the jacks 21 and 22 could be disposed upon one another.
  • the jacks 21 and 22 are juxtaposed so that a compact structure is obtained.
  • Each jack 21 and 22, respectively, includes two cylinder and piston units which are diagonally disposed at the corners of a rectangular supporting plate 25.
  • the pistons 23 of one jack 21 are connected to a U-shaped member 26 whereof the web facing the supporting plate 25 serves as a base for the carrying member 12.
  • the pistons 24 of the other jack 22 are connected to a member 27 extending directly between them and serving as a base for the carrying member 11.
  • the bases for the carrying members 11 and 12 thus are at different levels although the jacks 21 and 22 are fully juxtaposed. Same as in the embodiment shown in FIG. 1 the bases for the carrying members 11 and 12 are divided into upper and lower positions, the choice of position being determined by the place at which the joining piece 13 is situated.
  • the bases of the carrying members 1 1 and 12 consist of units which individually co-operate with the rod 8 and to which the main parts of the jacks are intended for detachable connection, from the side of the rod 8.
  • the parts of the jack assembly should thus be provided with laterally open grooves permitting the parts to be moved into and out of position of engagement with the rod 8.
  • FIGS. 4a 4e illustrate how the load applied to the rod 8 is lowered with the use of two hydraulic jacks 31 and 32 which are arranged above one another but which could be juxtaposed as shown in FIGS. 2 and 3.
  • the supporting means momentarily carried by the jacks has been shown fully hatched. With the load distributed uniformly on the two supporting means, said means are partly hatched.
  • the jacks 31 and 32 are formed with at least one lateral chamber 35.
  • the engagement pressure of the jack 31 and 32, respectively, against the supporting means 9 and 10, respectively, is wholly or partly removed when the hydraulic medium is transferred to the lateral chamber 35.
  • the lateral chamber is common to the two hydraulic jacks 31 and 32 which have been interconnected so as to form a closed system.
  • the hydraulic jack assembly thus forms a closed system with the lateral chamber 35 in which the hydraulic medium is subjected to a low pressure.
  • the pressure is produced by the spring 36 which actuates a piston in the chamber 35 which is a cylinder.
  • the chamber 35 in another embodiment thereof may have resilient walls which serve to produce the desired pressure.
  • the pressure can also be produced by means of a hand pump.
  • FIG. 4a the full load is carried by the piston 33 of the jack 31 which is shut off from the remaining system.
  • the supporting means has been moved along the rod 8 away from the piston 34 of the jack 32 which is in communication with the lateral chamber 35.
  • FIG. 4a the jack assembly is ready for lowering of the load by means of the upper piston 33.
  • FIG. 4bv the cylinders of the two jacks 31 and 32 have been connected via the throttle valve 37, the load on the pistons 33 and 34 having finally been distributed uniformly according to the law of communicating vessels.
  • FIG. 4c the upper supporting means 9 is relieved of load without giving up its engagement with the piston 33. Besides the communication between the jacks 31 and 32 is interrupted simultaneously as the chamber 35 is connected to the jack 31. The load has now been taken over by the piston 34 simultaneously as the piston 33 is relieved of load by the medium in the jack 31 being transferred to the lateral chamber 35.
  • FIG. 4d thus corresponds to FIG. 4a with the difference, however, that lowering shall be effected by the lower piston 34, the cylinders of the two jacks 31 and 32 being again connected with one another via the throttle valve 37, as shown in FIG. 4e.
  • FIGS. 5a 5g use is made of a plurality of jack assemblies 31 and 32 with pertaining lifting rods 8 for the lowering of a rigid load, the closed systems of the different jack assemblies 31, 32 being interconnected so that a uniform lowering of the load in all rods 8 is realized.
  • the jack assembly diagrammatically shown in FIGS. 5a 5g are of the same nature as that illustrated in FIGS. 4a 4e, and in the illustrated embodiment the jack assembly is assumed to be one of a group of three interconnected jack assemblies. In FIG. 5a this assembly occupies the same position as in FIG. 4a.
  • the jack 32 has been connected to the system of the three interconnected jack assemblies, all three rods 8 having been lowered a third of the stroke length at the.
  • FIG. 5c shows the position of the jack assembly in question after the second of the three jack assemblies of the group has been connected to the common system, which implies that all three lifting rods 8 have been lowered a further third of the stroke length.
  • FIG. 5d the third of the jack assemblies in the group has been connected to the common system, which implies that all three lifting rods 8 have again been lowered a third of the stroke length.
  • FIG. 5g thus corresponds to FIG. 5a with the difference, however, that lowering shall now be effected with the lower piston 34.
  • the return cylinders of the two cylinder and piston units consist of the lateral chamber with which the two jacks 31 and 32 are in communication.
  • the jack assembly has a multi-way valve 38.
  • the supporting means 9 and 10 need not necessarily be rigid means movable along the lifting element, but they can be for instance gripping means formed as supporting means.
  • FIG. 6a the jack assembly is ready for lowering of the load with the aid of the upper piston 33.
  • FIG. 6b the main cylinders of the two jacks 31 and 32 have been interconnected by means of the multi-way valve 38 while the communication with the return cylinder 39 of the lower jack 32 is maintained.
  • the gripping means 10 Before the lower piston 34 has reached its top position its gripping means 10 has been closed so that the load is distributed on the two pistons 33 and 34.
  • FIG. 66 the upper piston 33 is relieved of load in that the oil in its main cylinder is transferred via the valve 38 to the return cylinder 40 where a certain vacuum has been provided during the lowering movement of the piston 33.
  • the gripping means 9 can then be opened or the carrying member can be removed.
  • the jack assembly is now ready for lowering of the load by means of the lower piston 34.
  • FIG. 6e shows an alternative conduit diagram wherein the multi-way valve 38 has been replaced by a simple shut-off valve 41 and wherein the connections with the return cylinders 39 and 40 extend via the nonretum valves 42 and 43.
  • This arrangement implies the advantage that the return cylinder will not be erroneously exposed to pressure above atmospheric at the return movement of the piston.
  • a method of lowering and raising a load by means of a jack assembly and lifting element which comprises transferring the load from the lifting element by supporting means moveable along said lifting element and alternately carrying the supporting means by one-andthen the other of two carrying means having holes ac commodating the passage of the lifting element, with said carrying means being mounted on relatively moveable parts of the jack assembly, and said lifting element being joined in series with other lengths of lifting element by connectors of a size incapable of passing through the holes of the carrying means, and alternately dismounting the carrier means to permit free passage of the connectors and thus the joined lengths of the lifting element.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Types And Forms Of Lifts (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Intermediate Stations On Conveyors (AREA)
  • Actuator (AREA)
US321154A 1972-01-12 1973-01-05 Method of lowering and raising loads by means of a jack assembly and lifting element Expired - Lifetime US3895778A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE00295/72A SE354635B (de) 1972-01-12 1972-01-12

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/815,989 Reissue USRE31206E (en) 1972-01-12 1977-07-15 Method of lowering and raising loads by means of a jack assembly and lifting element

Publications (1)

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US3895778A true US3895778A (en) 1975-07-22

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US321154A Expired - Lifetime US3895778A (en) 1972-01-12 1973-01-05 Method of lowering and raising loads by means of a jack assembly and lifting element

Country Status (12)

Country Link
US (1) US3895778A (de)
JP (1) JPS4878650A (de)
AT (1) AT336841B (de)
BR (1) BR7300232D0 (de)
CA (1) CA1007632A (de)
DE (1) DE2300830A1 (de)
ES (1) ES410514A1 (de)
FR (1) FR2167951B1 (de)
GB (1) GB1422042A (de)
IT (1) IT988101B (de)
SE (1) SE354635B (de)
ZA (1) ZA7362B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4238115A (en) * 1979-08-17 1980-12-09 Research-Cottrell, Inc. Jacking device
US4460039A (en) * 1982-11-04 1984-07-17 W-K-M Wellhead Systems, Inc. Wellhead valve removal and installation tool
US4535971A (en) * 1980-12-16 1985-08-20 Compagnie Francaise D'enterprises Metalliques Propulsive-force jack installation for producing the continuous movement of an oblong object in the direction of its axis, and/or for moving an element along said object
EP1125529A3 (de) * 2000-02-07 2002-07-24 Georg Shandor Hayde Verstellbares Aufhängesystem

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2424451A1 (fr) * 1978-04-28 1979-11-23 Delattre Levivier Dispositif d'entrainement d'un mobile
US4615509A (en) * 1985-10-23 1986-10-07 Cibeles International Inc. Continuous operation linear hydraulic winch
GB2219568B (en) * 1988-06-11 1992-08-05 Hydra Tight Ltd Pulling tool.
JP4783493B2 (ja) * 2000-07-03 2011-09-28 鉄建建設株式会社 連続牽引ジャッキ
JP5673870B1 (ja) 2013-07-26 2015-02-18 東洋製罐グループホールディングス株式会社 表面に液層を有する樹脂構造体

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686420A (en) * 1954-08-17 Slab lifting apparatus
US3416284A (en) * 1964-07-24 1968-12-17 Felix M. Adler Method for constructing a building including feeding a plurality of end connected column sections upwardly through a jack system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2758467A (en) * 1950-08-12 1956-08-14 Philip N Youtz Building apparatus
SE317791B (de) * 1969-02-21 1969-11-24 O Jahr

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2686420A (en) * 1954-08-17 Slab lifting apparatus
US3416284A (en) * 1964-07-24 1968-12-17 Felix M. Adler Method for constructing a building including feeding a plurality of end connected column sections upwardly through a jack system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4238115A (en) * 1979-08-17 1980-12-09 Research-Cottrell, Inc. Jacking device
US4535971A (en) * 1980-12-16 1985-08-20 Compagnie Francaise D'enterprises Metalliques Propulsive-force jack installation for producing the continuous movement of an oblong object in the direction of its axis, and/or for moving an element along said object
US4460039A (en) * 1982-11-04 1984-07-17 W-K-M Wellhead Systems, Inc. Wellhead valve removal and installation tool
EP1125529A3 (de) * 2000-02-07 2002-07-24 Georg Shandor Hayde Verstellbares Aufhängesystem

Also Published As

Publication number Publication date
AU5097273A (en) 1974-07-11
FR2167951B1 (de) 1976-05-14
ATA17973A (de) 1976-09-15
SE354635B (de) 1973-03-19
IT988101B (it) 1975-04-10
ES410514A1 (es) 1975-12-01
BR7300232D0 (pt) 1973-09-27
FR2167951A1 (de) 1973-08-24
ZA7362B (en) 1973-09-26
AT336841B (de) 1977-05-25
CA1007632A (en) 1977-03-29
GB1422042A (en) 1976-01-21
DE2300830A1 (de) 1973-07-19
JPS4878650A (de) 1973-10-22

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