US3750895A - Yard jib crane - Google Patents

Yard jib crane Download PDF

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Publication number
US3750895A
US3750895A US00108753A US3750895DA US3750895A US 3750895 A US3750895 A US 3750895A US 00108753 A US00108753 A US 00108753A US 3750895D A US3750895D A US 3750895DA US 3750895 A US3750895 A US 3750895A
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United States
Prior art keywords
truck
secondary beam
boom
counterweight
tower
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Expired - Lifetime
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US00108753A
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English (en)
Inventor
P Durand
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Richier SA
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Richier SA
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C9/00—Travelling gear incorporated in or fitted to trolleys or cranes
    • B66C9/14—Trolley or crane travel drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/72—Counterweights or supports for balancing lifting couples
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/03—Cranes with arms or jibs; Multiple cranes
    • B66C2700/0385—Cranes with trolleys movable along adjustable or slewable arms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/03—Cranes with arms or jibs; Multiple cranes
    • B66C2700/0392—Movement of the crane arm; Coupling of the crane arm with the counterweights; Safety devices for the movement of the arm

Definitions

  • ABSTRACT A yard jib or tower crane having a vertical mast, a hoist boom supporting a load hoist truck being pivotally supported for rotation about the mast end including a first beam and a second beam attached to said first beam and being radially movable relative thereto; a counterweight boom supporting a balancing weight compensating for the moments about the mast generated by said truck-supporting boom; and a control including a replaceable profile cam for predetermined radial displacement of said second beam relative to the first beam and of the balancing weight along the counterweight boom during angular displacement in a horizontal plane of said boom about the mast.
  • the hoist boom of the crane consists of a main beam which is connected to the head or top of the tower or mast, and of a secondary beam attached to and adapted to be moved radially in either direction in relation to the first or main beam through suitable control or drive means.
  • the latter are adapted to also control elements, such as tackles, blocks, or the like, which cause a counterweight to move in a radial direction opposed to the direction of movement of the secondary beam, so that the crane moment, under no-load conditions, will not be appreciably changed by the displacement of the secondary beam along the first beam, the foregoing procedure being effected without producing any change in the radial position of the hoist truck in relation to the tower mast head.
  • this arrangement permits imparting to both the first and second hoist beams the overall relative length dimensions consistent with the loads supported thereby.
  • the stress generated in the secondary beam will be considerably lower than that generated in the main beam, in view of which the secondary beam may be constructed of smaller dimensions and weight than the main beam.
  • Another advantage of this arrangement lies in that the crane can be operated under the greatest range of conditions while taking the utmost advantage of its specific characteristics.
  • the element controlling the radial movements of the secondary beam are used, on the one hand, in combination with a member which is supported against relative rotation with respect to the jib, so as to reproduce the desired path or trajectory of the free end of the secondary beam during a 360 degree rotation, measured in the horizontal plane, of the complete jib assembly about the mast, and, on the other hand, includes a replaceable profile cam which is adapted to detect, on the aforementioned element and for each angular position of the jib, the radial position relative to the first beam to be imparted to the secondary beam, and also to concurrently actuate the control element for automatically setting the secondary beam in its proper operating position.
  • FIG. 1 is a side elevational view of the upper portion of the crane showing the arrangement for hoisting the load;
  • FIGS. 2 and 3 are fragmentary views, on an enlarged scale, showing more particularly in, respectively a side elevational view and in a section taken along line 3-3 of FIG. 2 the arrangements for moving the secondary beam in relation to the main hoist beam, and the hoist truck in relation to both beams
  • FIG. 4 is a side elevational view showing various phases of the transfer of the hoist truck from the secondary beam to the main hoist beam and reversely
  • FIGS. 5 and 6 are fragmentary views similar to FIGS. 2 and 3, i.e. taken, respectively, in side elevation and section along line 6-6 of FIG. 5, showing a modified arrangement for guiding the hoist truck on the main and secondary beams
  • FIGS. 7 and 8 are sectional views taken along, respectively, lines 7-7 and 8-8 of FIG. 6, showing an arrangement for laterally centering the hoist truck of FIGS. 5 and 6 during its transfer to the secondary beam and to the main beam, respectively
  • FIGS. 9 and 10 are schematic views showing two arrangements of the device for moving the secondary beam in relation to the main
  • FIGS. 11 and 12 are schematic views, respectively showing two arrangements of the rope means for driving the hoist truck.
  • the reference numeral 2 designates the tower of a jib crane, including a mast head 3 which is rotatably mounted on the upper por tion of this tower.
  • a counterweight boom 4 carrying a counterweight 5 and a hoist or truck boom which is generally designated as 6, are provided in aligned radial arrangement relative to the vertical axis of the tower 2.
  • the hoist or truck boom 6 comprises two elementl, i.e. i a main beam 7 having its root or base portion connected to the crane head 3,
  • the secondary beam 8 is carriedby the main beam 7 through the intermediary of identical sets of rollers, such as, respectively, upper and lower sets of rollers 9a and 9b. These sets of rollers are in turn carried by the lower frame structure of the main beam 7, adjacent the outer or free end thereof. Tracks are provided extending the length of the upper frame member 12 of the secondary beam 8 so as to permit the sliding movement thereof between the sets of rollers 90 and 9b.
  • the lower frame member 10 of main beam 7 also constitutes a track for a set of rollers 13a and 13b which are located at the upper portion of a hoist truck 14.
  • This hoist truck is equipped with another set of rollers a and 15b which are adapted to engage the track provided on the upper frame member 12 of secondary beam 8.
  • the truck 14 can travel along the main beam 7 as well as along the secondary beam 8 so as to be able to assume various radial positions between the base end of the former and the free or outer end of the latter, irrespective of the position of the secondary beam.
  • the pairs of rollers 13b and 15a are shifted vertically upwards in relation to their homologues 13a and 15b.
  • the distance e1 between centers of rollers 13a and 15a is determined to be slightly lesser than the distance e2 between the pairs of rollers 13b and 15b.
  • inclined surfaces 10a and 12a are provided, respectively, at the boom head end of the lower frame member 10 of main beam 7, and at the root or base end of the upper frame member 12 of secondary beam 8.
  • the truck 14 In the position denoted by A in FIG. 4, the truck 14 is carried both by the main beam 7 through rollers 13a and by the secondary beam 8 through rollers 156.
  • rollers 15a and 15b of truck 14 travel on a lower I-section frame member 18 of secondary beam 8, and with the upper frame member 12 of this beam travelling between the sets of rollers 9a and 9b.
  • Rollers 13a, 13b and 15a, 15b are, of course, disposed similar to those of the preceding arrangement so as to permit the desired progression of the passage of the truck from one beam to another.
  • the truck 14 is provided with lateral flanges 19 at its end closest to the outer end of the boom, in order to properly position the truck laterally in relation to the frame member 18 and to facilitate the passage of the truck from the main beam to the secondary beam.
  • these flanges 19 are spaced by a distance L slightly greater than the width 1 of frame member 18 and comprise, at their free ends, diverging or outflaring outwardly flaring portions which act like guide members.
  • the truck 14 is provided with rollers 11 movable about vertical axis and adapted to roll along the inner surface of frame members 10.
  • rollers 11 When the truck is being transferred from the secondary beam to the main beam, it is laterally positioned by these rollers 11 which, as shown in chain-dot lines in FIG. 8, engage end ramps 10b formed at the free or head end of frame members 10 and on the surfaces registering therewith.
  • the movements of the secondary beam below the main beam may be controlled through any suitable and known electrical, hydraulic or other actuating means.
  • the secondary beam is driven by a mechanism comprising a winch 22 which is mounted, for instance, on the main beam 7 which is and driven in turn by an electric motor 23.
  • the winch 22 is of the double-winding drum type so as to control the movements of two runs 24 and 25 of a suitable rope.
  • Run 24 is anchored at 26 to the secondary beam 8 and passes over a return pulley 27 mounted on the head or free end of the main beam 7.
  • the other run 25 passes over various pulleys constituting the set of pulleys 28a and 28b of a tackle 28 prior to being anchored with its free end, at 29, to the counterweight boom 4.
  • the set of pulleys 28a of tackle 28 is restrained against translation along the counterweight boom 4 and the other set 28b is connected to the counterweight 5 proper so as to be adapted to travel along the boom 4 in either direction, in correspondence with to the direction in which the secondary beam is travelling.
  • the counterweight 5 is operatively connected to a second set of pulleys 30a of a tackle 30 of which the first group 30b is restrained against translation along the counterweight boom 4.
  • a rope 32 passing over the pulleys of this tackle is attached at one end 33 to the counterweight boom 4 and at its opposite end 34 to the secondary beam 8.
  • the number of runs formed in each tackle 28, 30 is proportional to the ratio of the balance counterweight 5 to the weight of the secondary beam 8.
  • the mechanism driving the secondary beam may be controlled directly by the crane driver as a function of the configuration of the area above which the truck boom is to be operated, however, in a preferred form of the embodiment illustrated schematically in FIG. 9, this mechanism is automatically controlled.
  • the energization of the electric motor 23 is controlled by an apparatus 35 receiving information from a reading unit 36 travelling in conjunction with the crane jib relative to a stationary replaceable profile cam 37.
  • the edge of the profile cam 37 is dimensioned to provide a profile configuration having the same pattern as the ideal path, of movement, measured in a horizontal plane, of the free end of the secondary beam during a 360 displacement of this beam about the vertical axis of the mast head 3.
  • each angular movement of the jib is attended, if necessary, by a concurrent radial displacement of the secondary beam in relation to the main beam, this travel depending on the orientation of the truck boom and permitting the movement of the secondary beam either radially outwardly or inwardly in order to take the best possible advantage of the geographical area over which the truck boom is being operated, while preventing the boom from moving over thoroughfares or striking existing buildings which rise at least as high as the crane tower.
  • the yard jib or tower crane can be operated at a maximum degree of efficiency on any building sites, even on a site deeply situated among occupied houses or juxtaposed above busy thoroughfares,,requiring only very short preparation in time necessary for preparing a profile cam having a profile homothetic to the ideal trajectory to be followed by the free end of the secondary beam under the above-defined geographical condipulleys 28b and 30a of tackles 28 and 30 respectively,
  • n i.e. to the ratio of the weight of counterweight 5b to the weight of secondary beam 8.
  • the truck driving means In this crane, the truck driving means must be so arranged that the relative movement of the secondary beam to the main beam cannot interfere with the truck position.
  • the truck driving means as shown in FIG. 1 1, comprises a winch 38 mounted for instance on the counterweight boom 4 and has a double winding drum from which extend two runs 39 and 40 of a suitable rope.
  • the first run 39 passes over a pulley 42 which is mounted on the head or outer end of main beam 7, then returns below this beam so as to pass over another pulley 43 which is disposed at the root of the secondary beam, and adapted to return the run 39 to a third pulley 44 which is mounted at the outer end of the secondary beam 8. From pulley 44 the run is returned to the root or base of beam 8, and finally its free end is attached to the truck 14.
  • the other run 40 passes over a return pulley 45 which is mounted, for instance, on the counterweight boom 4 and has its free end similarly anchored to the truck 14.
  • the return pulleys 42 and 43 constitute a kind of block which, by automatically compensating for the movement of the secondary beam 8, allow of maintaining the truck 14 in the position initially imparted thereto before moving the secondary beam 8.
  • the device controlling the load movement comprises, as shown schematically in FIG. 1, a hoist 46 from which extends a rope 47 passing firstly over the pulleys 48, 49 and 50 of a set disposed near or at the root of the main beam, and then successively over the truck pulley 52, the pulleys 53 of the tackle block supporting the load or crane book 54, and finally over another pulley 55 of truck 14.
  • the rope passes over pulleys 56 and 57 which are mounted on, respectively, the head and root or base of the secondary beam 8, and its free end is eventually anchored at 58 to the head or free end of the main beam 7.
  • the truck 14 travels only below the secondary beam 8.
  • the radial displacement of the load takes place from the minimum load radius to the maximum load radius of main beam 7, by moving the secondary beam 8 having the truck 14 locked against motion, to the inner end of this beam 7 from the maximum load radius of main beam 7 to the maximum load radius of the truck supporting boom or I jib boom 6, by moving the truck 14 along the secondary beam 8.
  • FIG. 12 comprises a winch drum 60 which is mounted on the secondary beam 8, and two rope runs extending from this drum, one run having its free end attached to the truck at 62 and passing over a return pulley 63 mounted to the root of the secondary beam 8,. and another run attached by its free end at 64 to the truck 14 and passing over another return pulley 65 mounted on the head of the secondary beam 8.
  • the secondary beam 8 carries on its lower portion and along its entire length a track in the form of a single rail, consisting of, for example, an I section member 18 (FIG. which is engageable by the rollers of truck 14.
  • Improvements in yard jib or tower cranes with a radially travelling hoist truck of the type including a vertical tower having a mast head and a jib assembly rotatably mounted on the mast head of the tower, said jib assembly comprising a hoist truck boom, a load hoist truck being movable along said hoist truck boom, said truck having a tackle, and a counterweight boom carrying a balance weight adapted to be moved radially relative to said counterweight boom for compensating the moment created at the mast head level by the hoist truck boom, said hoist truck boom further including a main beam connected to the tower mast head and a secondary beam adapted to be moved radially in either direction relative to said main beam, control and driving means for imparting said movement to the secondary beam; tackle means adapted to be actuated by said control and driving means for causing the movement of said counterweight in a direction opposed to the direction of movement of said secondary beam, said control and drive means controlling the movements of the secondary beam being operative in one position thereof with a member
  • Tower crane as set forth in claim 1, comprising rollers disposed on either one of said main beam or secondary beam and engaging a suitable track means carried by the other beam for guiding said secondary beam during its translation in relation to said main beam.
  • the means controlling the movement of said secondary beam in relation to the main beam comprising a double-winding winch drum, means for actuating said winch drum, at least one rope having its two runs adapted to be partly wound on said drum and having free ends attached, respectively, to said secondary beam and to a fixed point of the counterweight boom, a set of return pulleys over which said rope runs pass being carried by the end of said counterweight which is closest to the tower, a further set of pulleys forming a tackle with said set of re turn pulleys being held against translation on said counterweight boom, a third set of pulleys carried on the other end of said counterweight, a fourth set of pulleys held against translation on said counterweight boom forming another rope tackle with said third set of pulleys and having its rope anchored to said counterweight boom through the end of one of its runs and to said secondary beam through the end of its other run, each said tackle comprising a number of runs equal or substantially equal to the ratio of the weight
  • said counterweight comprises a fixed element having a predetermined weight so as to balance the moment resulting from the product of the length of the main beam by one-half of the maximum load likely to be carried by said main beam and of a movable element of which the weight is a multiple of the weight of said secondary beam, said movable element of the counterweight being connected on the one hand to said secondary beam and on the other hand to said counterweight boom through tackle equal or substantially equal in number to the ratio of the weight of said movable counterweight element 'to the weight of said secondary beam.
  • said load truck driving means comprise a winch drum of the double winding type and a rope wound on said drum and having two runs, one run being attached with its free end to said truck and passing over a return pulley carried by said counterweight boom, the other run of said rope passing in succession over a pulley disposed at the head of said main beam and over another pulley disposed at the root of said secondary beam to constibeing anchored to said truck.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US00108753A 1970-01-22 1971-01-22 Yard jib crane Expired - Lifetime US3750895A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7002194A FR2111998B1 (fr) 1970-01-22 1970-01-22

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US3750895A true US3750895A (en) 1973-08-07

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US00108753A Expired - Lifetime US3750895A (en) 1970-01-22 1971-01-22 Yard jib crane

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US (1) US3750895A (fr)
CA (1) CA923079A (fr)
DE (1) DE2102737A1 (fr)
DK (1) DK127876B (fr)
FR (1) FR2111998B1 (fr)
GB (1) GB1286610A (fr)
SE (1) SE382615B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947144A (en) * 1974-08-26 1976-03-30 Barry Elliott Counterweighted mechanical boom
US4004696A (en) * 1975-10-17 1977-01-25 Dravo Corporation Material handling apparatus with load compensated counterweight system
US4907768A (en) * 1987-02-25 1990-03-13 Masseron Alain O F Telescoping crane
US20080061022A1 (en) * 2006-07-28 2008-03-13 Hans-Dieter Willim Lattice mast crane with a derrick boom
US20230026998A1 (en) * 2019-12-27 2023-01-26 S&L Access Systems Ab A crane comprising a movable boom and a movable counterweight

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE5871T1 (de) * 1980-04-18 1984-02-15 Karel Helena August Theyskens Turmdrehkran.
EP0205265B1 (fr) * 1985-05-30 1989-08-16 Toyota Jidosha Kabushiki Kaisha Véhicule pour travail en hauteur
GB2207109B (en) * 1987-02-25 1991-05-08 Alain Olivier Felix Masseron Telescoping crane
DE3718800A1 (de) * 1987-06-04 1988-12-15 Liebherr Werk Biberach Gmbh Turmdrehkran
GB8905421D0 (en) * 1989-03-09 1989-04-19 Value Control Limited Supporting portable power tools

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US859031A (en) * 1905-11-27 1907-07-02 Niels Anders Hansen Abel Crane for hoisting and distributing building materials, &c.
US2413701A (en) * 1941-09-24 1947-01-07 Faure Andre Crane
FR1212461A (fr) * 1958-10-17 1960-03-24 Potain & Cie Ets F Perfectionnements aux grues
US3381826A (en) * 1965-12-30 1968-05-07 Richier Sa Translating means for the counterbalancing carriages in tower cranes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US859031A (en) * 1905-11-27 1907-07-02 Niels Anders Hansen Abel Crane for hoisting and distributing building materials, &c.
US2413701A (en) * 1941-09-24 1947-01-07 Faure Andre Crane
FR1212461A (fr) * 1958-10-17 1960-03-24 Potain & Cie Ets F Perfectionnements aux grues
US3381826A (en) * 1965-12-30 1968-05-07 Richier Sa Translating means for the counterbalancing carriages in tower cranes

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3947144A (en) * 1974-08-26 1976-03-30 Barry Elliott Counterweighted mechanical boom
US4004696A (en) * 1975-10-17 1977-01-25 Dravo Corporation Material handling apparatus with load compensated counterweight system
US4907768A (en) * 1987-02-25 1990-03-13 Masseron Alain O F Telescoping crane
US20080061022A1 (en) * 2006-07-28 2008-03-13 Hans-Dieter Willim Lattice mast crane with a derrick boom
US7533779B2 (en) * 2006-07-28 2009-05-19 Liebherr-Werk Ehingen Lattice mast crane with a derrick boom
US20230026998A1 (en) * 2019-12-27 2023-01-26 S&L Access Systems Ab A crane comprising a movable boom and a movable counterweight
US12049390B2 (en) * 2019-12-27 2024-07-30 Skyrex Ab Crane comprising a movable boom and a movable counterweight

Also Published As

Publication number Publication date
FR2111998B1 (fr) 1974-08-09
DK127876B (da) 1974-01-28
GB1286610A (en) 1972-08-23
FR2111998A1 (fr) 1972-06-16
SE382615B (sv) 1976-02-09
DE2102737A1 (de) 1971-07-29
CA923079A (en) 1973-03-20

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