US3815759A - Inclinable jib for hoisting and transporting loads, in particular for cranes - Google Patents

Inclinable jib for hoisting and transporting loads, in particular for cranes Download PDF

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Publication number
US3815759A
US3815759A US00288318A US28831872A US3815759A US 3815759 A US3815759 A US 3815759A US 00288318 A US00288318 A US 00288318A US 28831872 A US28831872 A US 28831872A US 3815759 A US3815759 A US 3815759A
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United States
Prior art keywords
jib
foot
head
pulleys
winch
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Expired - Lifetime
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US00288318A
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English (en)
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M Gallay
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Individual
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Individual
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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
    • 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
    • B66C23/18—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 specially adapted for use in particular purposes
    • B66C23/26—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 specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail
    • 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
    • B66C23/18—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 specially adapted for use in particular purposes
    • B66C23/36—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 specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • 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
    • B66C2700/0321—Travelling cranes
    • B66C2700/0357—Cranes on road or off-road vehicles, on trailers or towed vehicles; Cranes on wheels or crane-trucks

Definitions

  • ABSTRACT An inclinable jib having a first beam with one end that is fixed to a lower king-pin to form a jib foot while the other end of the jib foot is pivotally connected to the base of a second beam which constitutes a jib head.
  • a fixedly positioned winch is connected by means of a cable to the free end of the jib head to control the variations of inclination of the jib head and jib foot.
  • a constant length sling has one end fastened to a fixed point while the other end is fastened to the jib foot with stop means in one embodiment being provided on the jib foot to make it mechanically integral with the jib head when the same is raised to a given position whereby the single winch may operate both jib foot and jib head in the selected manner.
  • stop means in one embodiment being provided on the jib foot to make it mechanically integral with the jib head when the same is raised to a given position whereby the single winch may operate both jib foot and jib head in the selected manner.
  • the present invention relates to a jib for a hoisting gear, such as a crane, or the like.
  • Said jib is made up of two members, one of which is linked to the end of the other, to wit, a jib foot and a jib head, the end of said jib head being provided with load-hoisting means.
  • the object of the present invention is to obviate the above drawbacks by providing a linked inclinable jib, the control of which is obtained in a very simple way, while new working abilities are available.
  • An inclinable jib includes a fixed lower king-pin to which a first beam is linked to constitute the jib foot, while the base of a second beam constituting the jib head is linked to the opposite end of said first beam, a fixedly positioned winch being connected through a cable to the free end of the jib head to control the variations of inclination thereof, and it is characterized in that a constant-length sling has one of its ends connected to the top of the jib foot, and its other end fastened to a fixed point, while stop means are provided on the jib foot to make the latter integral with the jib head when said jib head is raised up to a given position, so that, by means of the single winch, only the jib head steerable on the jib foot is actuated, as long as said jib head is inclined below its abutting position, whereas, after the jib head has reached said abutting position, said
  • the operating cable either provided with pulley-blocks or not, connects the winch drum directly to the end of a steerable king-rod, which, together with a stay and the jib head, defines an undeformable rocking triangle, the steerable king-rod being linked in the linking area of the two members of the jib, the stop means being constituted by two bearing heels, one of which is provided at the top of the jib foot, the other being provided on the base of the jib head.
  • the winch, the securing point for the sling, the steerableking-rod, and the bearing heels are located rearwardly of the pin through which the jib head is linked to the jib foot.
  • the control cable connecting the winch drum to the linked king-rod and the end of the jib head is fitted with reduction pulley-blocks completely housed within the jib foot.
  • the pulley-block assembly preferably includes a first set of pulleys secured to the upper part of the jib foot, and inside the latter, a second movably mounted set of pulleys moves inside the lower part of the jib foot, being. fastened to the cable end concerned, which cable is returned outwards, that is, towards the linked king-rod and the jibhead, by pulleys.
  • the pulley-block assembly comprising spaced sets of pulley disposed inside the jib foot is adapted to cooperate with a first stop, which is fixed but adjustable, and housed inside said jib foot, between the two sets of pulleys, which are both movable while a second fixed stop is provided above the upper set of pulleys, which is used as an anchoring point for one end of the constant-length sling, the latter being returned by pulleys towards another fixed anchoring point on the base of the crane.
  • the jib foot and the jib head move together as a unit until the upper set of pulleys abuts the second fixed stop, the jib head being further inclined with respect to the jib foot until the lower set of pulleys abut first stop.
  • the whole gear is preferably dimensioned in a manner such that, when the single winch pulls on the cable, the lower pulley-block assembly moves first, while the upper pulley-block assembly remains against its stop, said upper pulley-block assembly starting to be lowered, and causing both the jib foot and the jib head to rise, only when the lower pulley-block assembly bears against its stop.
  • FIG. 1 is a general view of a broken-jib crane according to the invention
  • FIGS. 2, 3 and 4 illustrate several successive steps of the operation of said crane
  • FIGS. 5 and 6 show a modification, with an inner pulley-block assembly
  • FIGS. 7 and 8 show another modification, with inner pulley-blocks and stops
  • FIGS. 9 and 10 show another adjustment of the modification of FIGS. 7 and 8.
  • FIGS. 1 to 4 show a broken-jib crane mounted, for instance, on the platform lot" a vehicle.
  • the base of a hollow beam 3 is linked to a fixed king-pin 2 on the platform 1, and constitutes the foot of the jib.
  • a pin 4 is provided at the front top of the jib foot 3.
  • the lower end of a further beam 5 is linked to said pin 4, said beam 5 constituting the jib head.
  • the free end of the jib head 5 is fitted with a hoisting cable 6 for handling the loads 7.
  • a king-rod 8 is linked to the pin 4.
  • a cable 9, which is anchored to the end 10 of the jib head 5 and to the end 11 of the linked king-rod 8, is connected to a control winch 12 fixedly mounted on the platform 1.
  • a pulley-block assembly 13 may be interposed in the path of the cable 9, in order to obtain a reduction.
  • a constant-length sling 14 is secured through one of its ends to the pin 4, and through its other end to a fixed point 15 on the platform 1.
  • a stop heel 16 is provided at the top of the jib foot 3, while another stop heel 17 is provided on the base of the jib head 5.
  • a pulley-block assembly such as 13 is a comparatively fragile device.
  • the present invention makes it possible to protect it.
  • the cable 9 is passed round pulleys 22 and 23 which return it towards the base of the jib foot 3, inside which it goes up to a first movable set of pulleys 24.
  • Said lower set 24 forms part of the pulley-block assembly 13, which includes, besides, an upper set 25 of pulleys, the axis pin of which is fixedly mounted inside the jib foot 3, at the top of the latter. Beyond the pulleysof the set 25, the cable is connected to the drum of the winch 12.
  • the two sets of pulleys of the pulley-block assembly 13, that is, the lower set 24 and an upper set 27, are movable.
  • the pin for the upper set of pulleys 27 is used as an anchoring point for the constant-length sling 14, the latter remaining, besides, connected to the fixed point on the platform 1.
  • a pulley 28 returns the sling to the upper part of the jib foot 3, so that the tension of the sling 14 tends to lift the set of pulleys 27 (arrow 29).
  • the extent of this lifting motion is limited by a fixed stop 30 integral with the jib foot 3.
  • a fixed stop 31 the location of which is adjustable, is provided between the two pulley sets 24 and 27, so as to act as a stop for the lower set 24 when the latter rises.
  • the whole gear is dimensioned in a manner such that, when the two sets 24 and 27 of pulleys are bearing against their respective stops (FIG. 10), the power required for pulling the upper set 27 downwards is higher than that required for pulling the lower set 24 downwards, it being understood that the winch 12 is simultaneously operated for slackening the cable.
  • the linking pin 4 for the jib foot 3 and the jib head 5 may be located at the front, or in the middle, or else at the rear of said two members, without it being necessary to provide the stop heels 16 and 17.
  • FIGS. 9 and 10 show, by way of example, an adjustment making it possible to obtain the same result as in FIGS. 1 to 4, that is, when-the jib head 5 and the jib foot 3 are integral with each other (the lower set 24 of pulleys bearing against its stop 31), said jib foot 3 and said jib head 5 are prolonging each other (angle 34 being equal to I claim: I
  • An inclinable jib for hoisting and transporting loads comprising: a first beam; a fixed lower king-pin to which said first beam is linked to constitute a jib foot; a second beam constituting a jib head said second beam being linked to the opposite end of said first beam, a fixedly positioned winch being connected through a cable to the free end of the jib'head to control the variations of inclination thereof; a constantlength sling having one of its ends connected to the top of the jib foot, and its other end fastened to a fixed point; stop means on the jib foot to make the latter integral with the jib head when said jib head is raised up to a given position, so that, by means of the single winch, only the jib head steerable on the jib foot is actuated, as long as said jib head is inclined below its abutting position, whereas, after the jib head has reached
  • An inclinable jib according to claim 1 characterized in that the upper end of the sling is secured directly to the top of the jib foot.
  • An inclinable jib for hoisting and transporting loads comprising: a first beam; a fixed lower king-pin to which said first beam is linked to constitute a jib foot; asecond beam constituting a jib head said second beam being linked to the opposite end of said first beam; afixedly positioned winch being connected through a cable to the free end of the jib head to control the variations of inclination thereof; a constantlength sling having one of its ends connected to the top of the jib foot, and its other end fastened to a fixed point, stop means on the jib foot to make the latter integral with the jib head when said jib head is raised up to a given position, so that, by means of the single winch, only the jib head steerable on the jib foot is actuated, as long as said jib head is inclined below its abutting position, whereas, after the jib head has reached said
  • An inclinable jib for hoisting and transporting loads comprising: a first beam; a fixed lower king-pin to which said first beam is linked to constitute a jib foot; a second beam constituting a jib head said second beam being linked to the opposite end of said first beam, a fixedly positioned winch being connected through a cable to the free end of the jib head to control the variations of inclination thereof; a constantlength sling being one of its ends connected to the top of the jib foot, and its other end fastened to a fixed point, a pulley-block assembly comprising spaced sets of pulleys disposed inside the jib foot and adapted to cooperate with a first stop, which is fixed but adjustable, and housed inside said jib foot between said sets of pulleys, which are both movable; a second fixed stop provided above the upper set of pulleys, which is used as an anchoring point for one end of said constantlength
  • An inclinable jib according to claim 1 characterized in that the constant length of the sling is adjustable, depending on the inclination desired for the jib foot.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Jib Cranes (AREA)
US00288318A 1971-09-15 1972-09-12 Inclinable jib for hoisting and transporting loads, in particular for cranes Expired - Lifetime US3815759A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7133992A FR2152491B1 (ja) 1971-09-15 1971-09-15

Publications (1)

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US3815759A true US3815759A (en) 1974-06-11

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Application Number Title Priority Date Filing Date
US00288318A Expired - Lifetime US3815759A (en) 1971-09-15 1972-09-12 Inclinable jib for hoisting and transporting loads, in particular for cranes

Country Status (10)

Country Link
US (1) US3815759A (ja)
JP (1) JPS4835548A (ja)
BE (1) BE788758A (ja)
CH (1) CH551340A (ja)
DE (1) DE2244585A1 (ja)
ES (1) ES406618A1 (ja)
FR (1) FR2152491B1 (ja)
GB (1) GB1400585A (ja)
IT (1) IT964178B (ja)
NL (1) NL7212525A (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4828125A (en) * 1986-09-01 1989-05-09 Osa Ab Device for maintaining a tool attachment in a knuckle boom crane on a constant level above the ground
US20040007552A1 (en) * 2002-07-09 2004-01-15 Hermann Franzen Mobile handling equipment for piece goods
EP1426321A1 (de) * 2002-12-06 2004-06-09 Liebherr-Werk Ehingen GmbH Mobilkran mit einem zweiteiligen Ausleger

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2435592C2 (de) * 1974-07-24 1981-11-26 Elba Maschinenfabrik Kaiser GmbH & Co, 6670 St Ingbert Turmdrehkran mit einem Laufkatzen- Knickausleger
SE422574B (sv) * 1980-06-03 1982-03-15 Asea Ab Trippelstativ for gaffeltruckar
JPS57170379A (en) * 1981-04-08 1982-10-20 Hitachi Ltd Undulating beam middle folding device for crane

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722319A (en) * 1950-09-19 1955-11-01 Ransomes & Rapier Ltd Crane
US3037641A (en) * 1961-02-27 1962-06-05 American Hoist & Derrick Co Tower crane attachment
US3252585A (en) * 1964-12-21 1966-05-24 Harnischfeger Corp Rigging for mobile tower crane having a topping jib-boom

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722319A (en) * 1950-09-19 1955-11-01 Ransomes & Rapier Ltd Crane
US3037641A (en) * 1961-02-27 1962-06-05 American Hoist & Derrick Co Tower crane attachment
US3252585A (en) * 1964-12-21 1966-05-24 Harnischfeger Corp Rigging for mobile tower crane having a topping jib-boom

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4828125A (en) * 1986-09-01 1989-05-09 Osa Ab Device for maintaining a tool attachment in a knuckle boom crane on a constant level above the ground
US20040007552A1 (en) * 2002-07-09 2004-01-15 Hermann Franzen Mobile handling equipment for piece goods
EP1426321A1 (de) * 2002-12-06 2004-06-09 Liebherr-Werk Ehingen GmbH Mobilkran mit einem zweiteiligen Ausleger
US20040124167A1 (en) * 2002-12-06 2004-07-01 Liebherr-Werk Ehingen Gmbh Mobile crane with elongated boom
US7219810B2 (en) 2002-12-06 2007-05-22 Liebherr-Werk Ehingen Gmbh Mobile crane with elongated boom

Also Published As

Publication number Publication date
GB1400585A (en) 1975-07-16
DE2244585A1 (de) 1973-03-22
FR2152491B1 (ja) 1977-07-08
IT964178B (it) 1974-01-21
NL7212525A (ja) 1973-03-19
FR2152491A1 (ja) 1973-04-27
BE788758A (fr) 1973-01-02
CH551340A (fr) 1974-07-15
ES406618A1 (es) 1976-01-16
JPS4835548A (ja) 1973-05-25

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