US3486583A - Arrangement at vertically adjustable stands - Google Patents

Arrangement at vertically adjustable stands Download PDF

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Publication number
US3486583A
US3486583A US690834A US3486583DA US3486583A US 3486583 A US3486583 A US 3486583A US 690834 A US690834 A US 690834A US 3486583D A US3486583D A US 3486583DA US 3486583 A US3486583 A US 3486583A
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stand
links
lowermost
platform
systems
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Expired - Lifetime
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US690834A
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English (en)
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Georg Wiklund
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Individual
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    • 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
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/042—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations actuated by lazy-tongs mechanisms or articulated levers

Definitions

  • a mobile stand which includes a platform and a pair of articulated systems of lifting arms on opposed sides of the platform for raising and lowering it, the systems of arms being interconnected by transverse shafts and the uppermost and lowermost central point being fixedto the platform and the stand, and includes stabilizing link systems transverse to the systems of lifting arms for preventing uneven movement during lifting and includes means for facilitating the initial lifting of the platform from its lowered position.
  • This invention relates to an arrangement at preferably mobile stands for cranes, hoists or the like, for example for building purposes, which stands are adapted to be raised and lowered and comprise a bottom frame mounted on a car or vehicle, and a plurality of platforms, balconies or the like adapted to be raised and lowered in relation to the bottom frame by a system of hinged arms of crosswise relationship and articulated with one another so as to form an extendible shears mechanism.
  • the system of cross-connected hinged arms is constructed as a simple shears, one of the lowermost hinged arms being articulated at the bottom frame, and the other lowermost hinged arm running by rolls on bars mounted in the frame and being adapted to be actuated by some power means for displacement in the longitudinal direction of the frame, thereby raising or lowering the stand.
  • An arrangement of the aforesaid type involves several disadvantages.
  • the stand upon the application of a force on the end of one hinged arm is being raised, great breaking loads will develop in the hinged arms and in the links by which the hinged arms are united.
  • the size of the stand and its capacity are already at the raising operation to carry a load, for example a building crane, building material or the like are limited.
  • much power is required for raising the stand.
  • the stabilization of the stand is improved by a system of stabilizing links connecting the ends of the two carrying link systems with each other, in such a manner, that the ends of the carrying links are slidably mounted on the outer shafts between the ends of the links in the carrying link systems, the ends of the lowermost carrying links being guided in parallel by a parallel construction in the bottom frame.
  • a lift starting device for facilitating the initial lifting phase, there is further mounted in the bottom frame a lift starting device by which the links in the "ice carrying link systems are lifted apart some distance before the main lifting force is being applied.
  • FIG. 1 shows in a lateral view a stand according to the invention mounted on a vehicle.
  • FIG. 2 shows a partial section along the longitudinal central line through the vehicle and the stand.
  • FIG. 3 shows a front view of the uppermost part of a longitudinal stabilizing link system according to the invention.
  • FIG. 4 shows in a horizontal view, partly in section, the lower part of the carrying link system with the parallel construction according to the invention.
  • FIG. 5 shows a side view, partly in section, of the lower part of a carrying link system with the lift starting device according to the invention.
  • the arrangement comprises a bottom frame 1 adapted to be mounted on a vehicle, which in the embodiment shown (FIG. 1) is a truck.
  • a carrying system of hinged arms which are placed crosswise and articulated with each other so as to form a shears, of which hinged arms the lowermost arms are half as long as the remaining arms and designated by 2 and 3.
  • a similar carrying system of hingedarms joined to form a shears of which arms the lowermost ones are designated by 5 and 6. Both of said systems are articulated with one another in the centre of the hinged arms and at their points of intersection.
  • two hydraulic cylinders 12 for example, can be applied, one cylinder on each side, which cylinders engage with the lowermost movable central shaft 11 in the stand. Thereby, a symmetric load on the stand is obtained and breaks in the stand are prevented.
  • the hydraulic cylinders can be driven in an easy way from the hydraulic system of the vehicle.
  • the raising and lowermg operations also may be effected by pairs of square thread screws (not shown) which may be driven from the auxiliary drive of the vehicle, for example via gears and chains.
  • the hydraulic cylinders of the screws also may be arranged lying and to engage with the lowermost end shafts 10.
  • a platform 14 is mounted, in such a manner, that the ends of the uppermost carrying links by rolls 7 can be displaced in horizontal grooves in the lower surface of the platform, similar to the construction at the bottom frame 1.
  • an overflow valve is opened whereby the outward movement of the piston rods of the hydraulic cylinders 12 is stopped.
  • a limit switch for example, may be provided.
  • the hydraulic cylinders may be provided with built-in throttle washers, for preventing the stand from collapsing too fast, for example due to a possible oil leakage. In raised position, thus, the stand is supported on the four rolls 7 in the bottom frame 1 and also on the piston ends of the lift cylinders 12, and it is secured by the locking pins 20 at the same time as the energy supply to the hydraulic cylinders is stopped, for example by stop valves.
  • the stand is given a very firm support and it may be loaded with cranes and other loads with overhang, to the extent as permitted by the underlying vehicle or car, without being affected in its stability.
  • the vehicle preferably is provided with supporting legs 19 for permitting a crane or a load to have a greater overhang.
  • the stand described, with a working platform 14, can be extended to a substantial height, for example eight meters or more, and with very good stability. It was found, however, particularly at great heights and when being exposed to heavy lopsided loads, that the stand has the tendency of sinking somewhat on one side or the other, which has its reason in the necessary play of the individual links and, of course, also in the position of the carrier vehicle.
  • the small settlement which normally may take place, is not alarming per se, but it can irritate the person staying on the platform.
  • the said stand further, has proved to require a tremendous initial lifting force, while after the very first separation of the links the power demand is substantially less.
  • the present invention has as its object to eliminate the aforesaid shortcomings and to stabilize the stand still more as well as to facilitate the lifting.
  • the invention is characterized by a stabilizing link system which connects the two ends of the parallel carrying link systems with each other, a parallel construction for guiding the lower ends of the carrying link systems, and a lift starting device for applying a lifting force to a central shaft between the carrying link systems, which shaft it located at a greater height than the lowermost central shaft.
  • an embodiment of the stabilizing link system comprises links 24 pivoted in pairs at their mutual central points 29, the ends of said links being slidably mounted by bushings 25 on the end shafts mounted in theends of the links of the carrying link systems.
  • supporting links 27 are articulated both at the links 24 in the middle between their common pivotal point 29 and the ends, and at a bushing 28 mounted in the centre of the end shafts.
  • FIG. 4 shows a horizontal view of the parallel construction at the lower ends of the carrying link systems.
  • the parallel construction comprises the lowermost end shaft 30 which connects the two ends on the lowermost carrying links 31 extending in the same direction.
  • the end shafts 30 are rigidly connected each with its guide beam 3-2 which 4 is slidably guided in holes, by a transverse beam 33, preferably that beam which supports the jacks 12.
  • FIG. 5 shows a front view, partly in section, of a stand provided with the lift starting device according to the present invention.
  • the two carrying link systems are connected with transverse central shafts, for example 11, 36.
  • a lifting force is applied to the lowermost beam 11 whereby the stand is caused to unfold upwardly.
  • the jacks 12 for the lifting must exercise a tremendous initial force for moving the stand from the totally collapsed position to a somewhat raised position. Thanks to the fact that the links are separated a small distance, the lifting force required is considerably smaller.
  • a first lifting force is applied against the next to lowermost shaft 36 of the said central shafts with the assistance of a lift starting device.
  • This device comprises a sleeve detachably mounted on the projecting end of the jack pistons.
  • This sleeve which in the following is called cap 37, is at one of its ends provided with a bottom and at its other end with a radially projecting flange 38.
  • a hoist crane can be mounted in a carriage 0n the working platform 14, whereby the stand together with the crane can be employed as a building crane for new constructions.
  • a crane of this type is equivalent to a conventional smaller tower crane and can be operated in the same way from the platform or by remote control from the building site. It offers in addition the advan tage, that the expensive and time-consuming mounting and dismounting work for conventional building cranes is eliminated and that the crane is not bound for a certain time to a definite place. Compared with usual mobile cranes, which always are operated from the ground, it offers the advantage that the crane operator can operate from the platform and, thus, always has a free view.
  • Another way of employing the stand according to the invention is to utilize it as a vertically adjustable working platform, i.e. without a crane.
  • a vertically adjustable working platform i.e. without a crane.
  • This type of stand thus, is employed indoors of large industrial buildings, in rock chambers and the like.
  • the same carriage which is used for the crane can be utilized for the mounting of various tools, for example a pair of forks adapted to be turned by the carriage.
  • various tools for example a pair of forks adapted to be turned by the carriage.
  • the stand When the stand is in its lowered position, pipe ducts or other details are placed in the forks, whereafter the stand is raised at the same time as the carriage is turned for fitting the pipe or details in position. If so required, the stand may thereby also be used for securing the workpiece by pressing. In this case, thus, the stand serves as a hoist.
  • the balconies can be provided with projecting decks for improving the accessibility at different working places, for example niches, protrusions or the like, and as mentioned, hoists and the like may be mounted on the balconies.
  • electric lines may be laid which at the height of the balconies are provided with taps for light, power supply etc.
  • An arrangement as described may also be utilized for transporting material to a working place, and after its arrival there be employed as a hoist to the desired level.
  • a mobile building stand having a base and a platform adapted to be raised and lowered, two articulated systems of lifting arms disposed on opposed sides of said stand and transverse shafts interconnecting the opposed lifting arms at points of intersection, the improvement comprising means securing the central uppermost and lowermost lifting arms to the platform and base respectively, rollers provided at the outermost ends of the upper and lower arms of said systems, the platform and base being provided with horizontal grooves to receive said rollers, locking bars moveable with said rollers, means for locking said 'bars in a desired position on said base, two stabilizing link systems on opposed sides of said stand and mounted transversely to the lifting arms systems, each link system comprising links articulated in pairs at their central points, the ends of said links being slidably mounted on the ends of said transverse shafts adjacent said lifting arms, supporting links articulated with the centre of said said transverse shafts and with the stabilizing links at the midpoint between the central pivotal point and the ends thereof, and means for raising said plaftorm.
  • a mobile building stand having a base and a platform adapted to be raised and lowered, two articulated systems of lifting arms disposed on opposed sides of said stand and transverse shafts interconnecting the opposed lifting arms at points of intersection, the improvement comprising means securing the central uppermost and lowermost lifting arms to the platform and base respectively, rollers provided at the outermost ends of the upper and lower arms of said systems, the platform and base being provided with horizontal grooves to receive said rollers, locking bars moveable with said rollers, means for locking said bars in a desired position on said base, two stabilizing link systems mounted on opposed sides of said stand and transversely of said lifting arms systems, said link systems being articulated with the ends of said arms, and means for facilitating the initial lifting-of said platform comprising a plurality of jacks, elongated caps atop each jack, said caps being provided with radial flanges at the lower ends thereof, said lowermost central transverse shaft being provided with vertical guide holes therethrough to receive said elongated caps, whereby said caps when raised by said
  • a mobile building stand as claimed in claim 1 wherein the means for raising the platform includes means for exerting a lifting force on the next to lowermost transverse shaft before exerting a lifting force on the lower-most transverse shaft.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
US690834A 1967-11-21 1967-12-15 Arrangement at vertically adjustable stands Expired - Lifetime US3486583A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE15984/67A SE311989B (de) 1967-11-21 1967-11-21

Publications (1)

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US3486583A true US3486583A (en) 1969-12-30

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US690834A Expired - Lifetime US3486583A (en) 1967-11-21 1967-12-15 Arrangement at vertically adjustable stands

Country Status (5)

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US (1) US3486583A (de)
DE (1) DE1756361A1 (de)
FR (1) FR1565973A (de)
GB (1) GB1183286A (de)
SE (1) SE311989B (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877544A (en) * 1971-10-14 1975-04-15 Del Mar Eng Lab Stress balanced extendible boom structure
US3964725A (en) * 1973-04-17 1976-06-22 Kabushiki Kaisha Morita Seisakusho Dental chair
US3983960A (en) * 1973-10-15 1976-10-05 Robert Staines Scissors lift
US4123039A (en) * 1975-07-03 1978-10-31 American Sterilizer Company Raise-lower device
US5375681A (en) * 1992-08-05 1994-12-27 Eickmann; Karl Lifting device and stroke multiplier
US20030066334A1 (en) * 2001-10-09 2003-04-10 Mcclellan Daniel Jack with elevatable platform
ES2203350A1 (es) * 2003-11-26 2004-04-01 Oscar Méndez Argente Plataforma elevadora remolcable.
US20040200258A1 (en) * 2003-04-08 2004-10-14 Hess Jeffrey A. Locking mechanism for jack with elevated platform
WO2005058742A1 (de) * 2003-12-18 2005-06-30 Gerold Heckert Scherenhubtisch
US10227222B2 (en) 2015-07-31 2019-03-12 Vehicle Service Group, Llc Precast concrete pit
US10246313B2 (en) 2015-07-31 2019-04-02 Vehicle Service Group, Llc Precast concrete pit

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1553107A (en) * 1975-05-17 1979-09-19 Nisso Sangyo Kk Working base elevating apparatus
SE8007216L (sv) * 1980-10-15 1982-04-16 Nertransportdon Ntd Ab Hoj- och senkbart arbetsbord, eller likanade
CN101092230B (zh) * 2007-06-28 2013-06-05 倪既民 变叉折叠式附框组合剪叉升降车
CN111439711A (zh) * 2020-05-13 2020-07-24 张必武 一种室内装修用便携式升降机
CN112411977A (zh) * 2020-12-02 2021-02-26 山东耀华特耐科技有限公司 一种耐火材料多层一体化施工设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE545141A (de) *
US722166A (en) * 1902-10-25 1903-03-03 Charles E Taft Truck.
US3174722A (en) * 1962-09-17 1965-03-23 Erhard J Alm Load lifting device
US3373844A (en) * 1966-05-16 1968-03-19 George F. Schafer Compact motorized scaffold arrangement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE545141A (de) *
US722166A (en) * 1902-10-25 1903-03-03 Charles E Taft Truck.
US3174722A (en) * 1962-09-17 1965-03-23 Erhard J Alm Load lifting device
US3373844A (en) * 1966-05-16 1968-03-19 George F. Schafer Compact motorized scaffold arrangement

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877544A (en) * 1971-10-14 1975-04-15 Del Mar Eng Lab Stress balanced extendible boom structure
US3964725A (en) * 1973-04-17 1976-06-22 Kabushiki Kaisha Morita Seisakusho Dental chair
US3983960A (en) * 1973-10-15 1976-10-05 Robert Staines Scissors lift
US4123039A (en) * 1975-07-03 1978-10-31 American Sterilizer Company Raise-lower device
US5375681A (en) * 1992-08-05 1994-12-27 Eickmann; Karl Lifting device and stroke multiplier
WO2003031092A1 (en) * 2001-10-09 2003-04-17 Delaware Capital Formation, Inc. Jack with elevatable platform
US20030066334A1 (en) * 2001-10-09 2003-04-10 Mcclellan Daniel Jack with elevatable platform
US6601430B2 (en) * 2001-10-09 2003-08-05 Delaware Capital Formation, Inc. Jack with elevatable platform
US20040200258A1 (en) * 2003-04-08 2004-10-14 Hess Jeffrey A. Locking mechanism for jack with elevated platform
ES2203350A1 (es) * 2003-11-26 2004-04-01 Oscar Méndez Argente Plataforma elevadora remolcable.
WO2005058742A1 (de) * 2003-12-18 2005-06-30 Gerold Heckert Scherenhubtisch
US20070017748A1 (en) * 2003-12-18 2007-01-25 Gerold Heckert Scissors-type lifting platform
US10227222B2 (en) 2015-07-31 2019-03-12 Vehicle Service Group, Llc Precast concrete pit
US10246313B2 (en) 2015-07-31 2019-04-02 Vehicle Service Group, Llc Precast concrete pit

Also Published As

Publication number Publication date
SE311989B (de) 1969-06-30
DE1756361A1 (de) 1970-04-09
GB1183286A (en) 1970-03-04
FR1565973A (de) 1969-05-02

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