US3572636A - Device for automatic control of climbing jack movements - Google Patents

Device for automatic control of climbing jack movements Download PDF

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Publication number
US3572636A
US3572636A US722975A US3572636DA US3572636A US 3572636 A US3572636 A US 3572636A US 722975 A US722975 A US 722975A US 3572636D A US3572636D A US 3572636DA US 3572636 A US3572636 A US 3572636A
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US
United States
Prior art keywords
control member
climbing
jack
grip
locking means
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 - Lifetime
Application number
US722975A
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English (en)
Inventor
Rolf Gustaf Johansson
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.)
BYGGFORBATTRING AB
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BYGGFORBATTRING AB
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 BYGGFORBATTRING AB filed Critical BYGGFORBATTRING AB
Application granted granted Critical
Publication of US3572636A publication Critical patent/US3572636A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/06—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
    • E04G11/20—Movable forms; Movable forms for moulding cylindrical, conical or hyperbolical structures; Templates serving as forms for positioning blocks or the like
    • E04G11/22—Sliding forms raised continuously or step-by-step and being in contact with the poured concrete during raising and which are not anchored in the hardened concrete; Arrangements of lifting means therefor
    • E04G11/24—Construction of lifting jacks or climbing rods for sliding forms
    • 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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B66F3/25—Constructional features
    • B66F3/30—Constructional features with positive brakes or locks

Definitions

  • Climbing jacks have long been in useprimarily for the lifting of forms in connection with sliding form casting. In recent years, climbing jacks have increasingly come into use for other purposes, such as the lifting of heavy loads, in connection or without connection with sliding form casting.
  • Climbing jacks generally have in common, two pairs of grip members alternatingly movable along arod in such a manner that one pair always is retaining while the other pair is being moved.
  • the power required for the movement is obtained from the lifting members, which are connected with the grip members and which may be mechanical, pneumatic or hydraulic. In certain connections particularly hydraulic climbing jacks, with their low weight in relation to their lift capacity, have proved to be an ideal lifting equipment.
  • FIG. 1 shows partially in section a climbing jack for upward climbing, inclusive of a climb rod and control means, with the.
  • FIG. 2 shows the same device as FIG. 1, with the upper grip head having been moved to its uppermost position by hydraulic pressure cylinder'piston means.
  • the climbing jack climbs on an entirely smooth climb rod 1 and comprises a hydraulic pressure cylinder provided with a piston 4. Both of grip heads 2 and 3 of the climbing jack are provided with grip members which block the downward movement'but allow for unimpeded upward movement. Between the two grip heads 2, 3, two hydraulicjacksare arranged on diametrically opposite sides of the climb rod 1, each of said jacks comprising a piston 4, a cylinder Sand a return spring (not shown), with the said spring biasing the lower griphead 3 upwards against the upper grip head 2 when'the medium in the cylinder 5 is pressureless.
  • the control means comprises a locking head 6 secured by clamp screws to the lower grip head 3.
  • a locking bar 7 is pivoted to a holder 8 by a cotter pin 12 which is'positioned in a hole 18 and the holder is secured by a clamp screw secured to the upper grip head '2.
  • the climbing jack is to move upwardly a load supported on the grip head 2.
  • the rod '1 rests at its lower end on a fixed support or with its upper end in asuspended connection with a fixed support.
  • the climbing jack theoretically would travel at each step a distance having the same length as the maximum stroke of the jack.
  • the length of the climbing step is always shorter than the maximum stroke of the pressure cylinder, and in the case of several cooperating climbing jacks, the steps have individual different lengths. As the individual differences have the tendency to multiply, after a plurality of climbing steps, they result in unacceptable deviations, so that manual adjustment of the individual climbing distances is required.
  • locking bar 7 is lifted and thereby ceases to effect a locking action on a chain 9 which isfastened by locking means M to the climb rod 1 and wound by a suitable winding device 19 in a chain box 17 after its travel over the rollers 15 and 16. It will be seen that the rollers 15 and 16 and the chain box 17 are mounted on the locking head 6.
  • the chain 9 can be held in stretched condition by a locking member 10 which, by a spring-loaded piston or plunger 11, is pressed against the chain.
  • the locking bar 7 is free of its engagement with a space in the chain 9, its lower end is held by a spring-loaded ball 13 through a distance corresponding to the distance between two spaces in the chain to the position shown in FIG. 2.
  • FIG. 2 it will be seen that the upper grip head 3 has been moved upwardly hydraulically as much as possible so the heads 2 and 3 are disposed at their farthermost relative position.
  • the locking bar 7 is free from the chain 9 and is pressed against the member 22 by means of the spring-loaded ball 13.
  • the lower head 3 has been moved upwardly and lower tail portion of the bar 7 has entered a space in the chain 9 and has been moved to the left by the chain to stop against the member 21 thereby providing an uppermost position for the grip head 3.
  • the upper head 2 is again moved upwardly and so on and for each step, and the uppermost position of the lower head 3 is determined by the distance between the spaces in the chain 9.
  • the locking bar 7 is provided with a plurality of apertures 18 for the cotter pin 12.
  • all jacks used in a common lifting operation are provided with the present control means, all jacks are given a travel distance of substantially equal length, independently of the number of climbing steps.
  • the chains always are stretched equally by the spring force pressing the pistons with the lower grip heads upwards.
  • the individual differences in the climbing step length being caused on smooth rods, such as by different loads on the jacks and by the particular gripping capacity of the grip means, automatically are compensated for at the next following climbing step, because at that time the piston can move into the cylinder to a greater depth. All of the climbing jacks used in the common lifting operation are caused to execute the climbing steps simultaneously, such as for example hydraulically.
  • a device for automatically controlling the travelling distance of a climbing jack climbing stepwise on a smooth climbing rod comprising a flexible elongated control member, means connecting said control member to and stretching the same parallel to the climb rod by the climbing jack, said control member having equally spaced openings, and a locking means on the climbing jack in each of successive step motions of the jack engaging a subsequent opening of the control member thus effecting limiting of the length of the step.
  • the device as claimed in claim 1 further including two grip heads operating alternately for effecting the stepwise movement, said locking means which, by a variation in the distance between said grip heads resulting from said stepwise movement, is actuated to engage an opening in the control member so that by such engagement, the movement of one of said grip heads is locked.
  • the device as claimed in claim 4 including guide means connected to one of said grip heads and over which guide means said control member passes, said control member between said guide means having a substantially horizontal connection and said locking means including a vertical locking bar operably connected to the other grip head and pivotable between two stop members on said one grip head above the horizontal extension of the control member viewed in the direction of movement of the latter, and said locking means, during the movement in a direction against each of said grip heads, being adapted to engage a hold in the control member so that the movement of said one grip head alter a predetermined distance of such head is retained by said control member and during a movement apart of said grip heads, the locking means is disengaged from the control member, said locking means then being moved against the other of said stop members by a spring-loaded ball.
  • step length is set selectively by making at least one of the openings of the control member inoperative by mounting the locking means at different levels relative to the other grip head.
  • the device as claimed in claim 1 including winding means for said flexible elongated control member and means connecting the winding means to the jack.
  • a method for controlling the traveling distance of a plurality of climbing jack each climbing stepwise on a separate smooth climb rod comprising controlling the step length of each of the climbing jacks by a flexible elongated control member connected to the climb rod and stretched in parallelism to the rod by the climbing jack and having equally spaced openings therein cooperating with locking means on the climbing jack to define the length of the successive steps of the jack, and making each of the control members of different jacks substantially identical whereby the same step length is imparted to the different jacks.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Jib Cranes (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Load-Engaging Elements For Cranes (AREA)
US722975A 1967-04-25 1968-04-22 Device for automatic control of climbing jack movements Expired - Lifetime US3572636A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE05808/67A SE334457B (fr) 1967-04-25 1967-04-25

Publications (1)

Publication Number Publication Date
US3572636A true US3572636A (en) 1971-03-30

Family

ID=20267283

Family Applications (1)

Application Number Title Priority Date Filing Date
US722975A Expired - Lifetime US3572636A (en) 1967-04-25 1968-04-22 Device for automatic control of climbing jack movements

Country Status (4)

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US (1) US3572636A (fr)
DE (1) DE1756230A1 (fr)
GB (1) GB1220253A (fr)
SE (1) SE334457B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889926A (en) * 1973-11-19 1975-06-17 Ahlgren Nils H Methods for shifting loads

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104986702B (zh) * 2015-07-10 2017-05-10 安徽巨一自动化装备有限公司 高空升降机升降滑台缓冲系统
CN114319990A (zh) * 2021-12-15 2022-04-12 中国三冶集团有限公司 一种倒锥壳水塔施工工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2914302A (en) * 1957-05-27 1959-11-24 Sampson Construction Co Inc Slip-form jack
US2944403A (en) * 1953-09-04 1960-07-12 Raymond Int Inc Hydraulic jacking assembly for marine platforms
US3172297A (en) * 1962-08-15 1965-03-09 Reynolds Printasign Co Gripper adapted for lineal indexing
US3389890A (en) * 1966-07-01 1968-06-25 Offshore Co Jacking apparatus and controls

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2944403A (en) * 1953-09-04 1960-07-12 Raymond Int Inc Hydraulic jacking assembly for marine platforms
US2914302A (en) * 1957-05-27 1959-11-24 Sampson Construction Co Inc Slip-form jack
US3172297A (en) * 1962-08-15 1965-03-09 Reynolds Printasign Co Gripper adapted for lineal indexing
US3389890A (en) * 1966-07-01 1968-06-25 Offshore Co Jacking apparatus and controls

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3889926A (en) * 1973-11-19 1975-06-17 Ahlgren Nils H Methods for shifting loads

Also Published As

Publication number Publication date
SE334457B (fr) 1971-04-26
GB1220253A (en) 1971-01-27
DE1756230A1 (de) 1970-03-12

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