US3892316A - Crane with folding mast and jib - Google Patents

Crane with folding mast and jib Download PDF

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Publication number
US3892316A
US3892316A US322664A US32266473A US3892316A US 3892316 A US3892316 A US 3892316A US 322664 A US322664 A US 322664A US 32266473 A US32266473 A US 32266473A US 3892316 A US3892316 A US 3892316A
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US
United States
Prior art keywords
mast
jib
crane
pivot pin
compensation bar
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
US322664A
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English (en)
Inventor
Jean Noly
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.)
Manitowoc Crane Group France SAS
Original Assignee
Potain SA
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 Potain SA filed Critical Potain SA
Application granted granted Critical
Publication of US3892316A publication Critical patent/US3892316A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B66C23/64—Jibs
    • B66C23/68—Jibs foldable or otherwise adjustable in configuration
    • 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
    • B66C23/34—Self-erecting cranes, i.e. with hoisting gear adapted for crane erection purposes

Definitions

  • a crane of the type having a mast pivoted to a base for movement between a horizontal and vertical position and a jib pivoted to the top end of the mast is provided with a compensation bar to assist in the raising of the jib and mast to the operative position wherein the mast is disposed in a vertical position and a jib is disposed horizontally perpendicular thereto.
  • the compensation bar is pivoted at one end to the base with the opposite end thereof disposed in movable engagement with the underside of the jib when the jib and mast are disposed in the horizontal folded transport position.
  • a set of pulleys are provided adjacent said opposite end of the compensation bar and another set of pulleys is provided adjacent the mid-portion of the mast.
  • a cable is disposed about said sets of pulleys and secured to a winch so that upon taking-up of the cable on the winch the distance between said sets of pulleys will be shortened to raise said compensation bar from a horizontal position to a raised position
  • the initial raising of the compensation bar will lift the free end of the jib and continued takingup of the cable on said winch will further shorten the distance between said sets of pulleys to raise the mast to the vertical position.
  • An additional flexible member is secured to the mid-point of said jib and the base over the top of the mast to support the jib in a horizontal perpendicular position relative to said mast.
  • the present invention relates to a crane of a new type, the mast and jib of which are adapted to be brought back to a horizontal position when the crane is to be transported to another site.
  • the object of the present invention is to obviate such drawbacks by providing a crane, the position for road transport of which is very low, this being achieved without unduly increasing the stresses in the cable and tackle arrangement and, therefore, in the raising winch.
  • a foldable crane includes an undercarriage, a stand integral with said undercarriage and provided at its top with a transverse pivot pin, a mast, the lower portion of which is capable of rocking about said pivot pin between a vertical working position and a horizontal transportation position, a jib pivoted to the top of said mast and capable of being folded back horizontally against the latter, a raising winch carried by the undercarriage, and is characterized in that it includes, besides, a compensation bar the lower end of which is linked or pivoted to the undercarriage and stand assembly, while its upper end carries means which allow it to roll or slide over the underside of the jib lower frame, the cable of the raising winch being wound between a set of pulleys carried by the upper part of the compensation bar and a set of pulleys carried by the mast between the raising pivot pin thereof and the pivot pin for the jib, while finally a flexible sling or member has one of its ends hooked to the compensation bar and its other end hooked to the
  • the torque required for raising the jib alone from the horizontal position thereof by making the jib rock about its pivot pin on the mast is lower than the torque required for raising the mast and jib assembly from the horizontal position thereof by making said assembly rock about the pivot pin for the mast.
  • the cable and pulley assembly is directed substantially horizontally when the mast and the jib are folded back in a horizontal position too.
  • the length of the sling is selected so as to stop the compensation bar when the latter has raised the jib by about 20 with respect to the horizontal direction of the mast.
  • a jib sling has one of its ends secured to the back of the jib and passes then over at least one post linked to the top of the mast, while the opposite end thereof is secured to the undercarriage of the crane, said jib sling tightening automatically as soon as the mast has been raised about its pivot pin according to a direction inclined by at least 10 with respect to a horizontal line.
  • the location of the apices of the polygon defined by the jib raising sling are selected, as well as the relative locations of the pivot pin for the mast and the pivot pin for the jib on the mast, in such a way that the jib is kept set in an unchanging direction during the whole stage of the mast raising operation wherein the mast is raised beyond its position corresponding to which the jib leaves the end of the compensation bar.
  • the means provided on the free end of the compensation bar to ensure the contact of the latter with the jib are constituted by rollers capable of rolling along the lower frame or underside of the jib.
  • the block-pulleys carried by the mast are are fitted to that side of the mast which faces upwards when the mast is in a horizontal position.
  • FIG. 1 is a schematic view of a crane according to the invention, folded in position for transportation.
  • FIGS. 2 to S are schematic views of the crane which illustrate the successive stages of the raising of said crane.
  • the drawing shows a foldable crane, which includes an undercarriage l, a stand 2 integral with the undercarriage l, the top of said stand being provided with a transverse pin 15 about which a mast 3 is adapted to pivot between a vertical working position and a horizontal transport position.
  • a jib 4 is pivoted to the top of the mast 3, and is adapted to be folded horizontally against the latter when the crane is to be transported.
  • a raising winch 5 is carried by the undercarriage l of the crane.
  • a compensation bar 6 has its lower end linked at 7 to the stand 2, while its other end is provided with rollers 8 enabling it to slide over the underside of the jib. Said compensation bar 6 is provided, besides, with pulleys 9 towards that end thereof which carries the rollers 8.
  • the cable 11 of the raising winch 5 is wound be tween the set of pulleys 9 and a further set of pulleys 10 carried by the mast 3 between the raising pivot pin 15 and the pivot pin 20 for the jib, on that side of the mast facing upwards when said mast is in a horizontal position.
  • the cable and pulley assembly is thus set in a substantially horizontal direction when the mast and the jib are in their horizontal positions too.
  • One end of a flexible sling or member vl2 - is hooked to the upper end of the compensation bar 6, while the other end is hooked to'the stand 2.
  • a jib sling or flexible member 13 is secured to the back of the jib 4, and passes over a post 14 linked or pivoted to the top of the mast 3 by a pivot 21, and is then secured to the undercarriage I. Said jib sling is automatically tightened as soon as the mast 3 has been raised about its pivot pin according to a direction inclined by at least l to the horizontal.
  • the length of the flexible sling 12, which is slack when the raising operation starts, is selected so as to stop the compensation bar when the latter has raised the jib by about 20 with respect to the horizontal direction of the mast.
  • the raising winch 5 is started.
  • the mast 3 remains horizontal, the pulling action of the cable and pulley assembly causing only the compensation bar 6 to rock.
  • This causes the jib to be raised with respect to the mast 3, whereby the cable assembly 10-11 is brought to a position wherein it is capable of causing the mast 3 to rise, as the sling or flexible member 12 is now tight and locks the compensation bar 6 (FIG. 3).
  • the mast 3 keeps pivoting in an upward direction, but the jib 4 remains horizontal (FIG, .4), while moving away from the compensation bar.
  • the raising proceeds in the same way till the crane is fully raised (FIG. 5).
  • the transport position of the crane does not depend on the lever arm required between the raising cable assembly and the pivot pin 15 for the mast 3, which makes it possible to have a very low transport position 'while not unduly increasing the stresses in the cable and pulley assembly and, therefore, in the raising winch;
  • the crane may reach the working site and be raised thereon immediately, without it being necessary for it to follow a special route as is the case with special dimension conveys.”
  • a tblding crane including an undercarriage, a stand integral with said undercarriage and provided at its top with a first transverse pivot pin, a mast having a top portion and-a lower portion, the lower portion of said mast being pivotally mounted on said first pivot pin for movement between a vertical working position and a horizontal transport, position, a second transverse pivot pin secured to the top portion of said mast, a jib pivoted to the top of said mast on said second pivot pin and capable of being folded back horizontally against said mast in the transport position, a raising winch carried by said undercarriage, a third pivot pin on said stand adjacent said undercarriage, a compensation bar having an upper end and a lower end, said lower end of said bar being pivoted to said third pivot pin, means secured to the upper end of said bar for movement along a side of said jib which is disposed adjacent said mast in the transport position, first pulley means carried by said compensation bar adjacent the upper end thereof and second pulley means carried by said mast between said
  • a crane as set forth in claim 1 further comprising an additional flexible member having one end thereof secured to said jib, a fourth pivot pin on the top of said mast, at least one post pivoted to said fourth pivot on the top of said mast, said additional flexible member extending over said post, said additional flexible member having the other end thereof secured to the under carriage of said crane whereby said additional flexible member will be automatically tightened as soon as the mast has been raised about its pivot pin to at least a 10 angle with respect to the horizontal.
  • a crane as set forth in claim 1 wherein the means provided at the upper end of said compensation bar to ensure movable contact of the latter with the jib are comprised of rollers adapted to engage and move along said side of said jib.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Jib Cranes (AREA)
US322664A 1972-01-14 1973-01-11 Crane with folding mast and jib Expired - Lifetime US3892316A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7201979A FR2167464B1 (fr) 1972-01-14 1972-01-14

Publications (1)

Publication Number Publication Date
US3892316A true US3892316A (en) 1975-07-01

Family

ID=9092227

Family Applications (1)

Application Number Title Priority Date Filing Date
US322664A Expired - Lifetime US3892316A (en) 1972-01-14 1973-01-11 Crane with folding mast and jib

Country Status (8)

Country Link
US (1) US3892316A (fr)
JP (1) JPS4881251A (fr)
BR (1) BR7300293D0 (fr)
DK (1) DK137376B (fr)
FR (1) FR2167464B1 (fr)
GB (1) GB1409373A (fr)
IT (1) IT978010B (fr)
NL (1) NL7300396A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987594A (en) * 1975-02-06 1976-10-26 Clark Equipment Company System and method for automatic unstowing and stowing of a crane boom
CN103787205A (zh) * 2014-02-27 2014-05-14 钦州学院 两自由度双闭环混合驱动正面吊运起重机
ITMI20131510A1 (it) * 2013-09-12 2015-03-13 O M V Ohg Vicario S P A Gru auto-montante priva di contrappeso

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194411A (en) * 1962-07-30 1965-07-13 Weitz S A Ets Pivoting tower crane
US3378147A (en) * 1965-11-09 1968-04-16 Boilot Petolat Ets Tower crane rotatable on its base

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1217450A (en) * 1968-04-18 1970-12-31 Edilmac Spa Improvements in or relating to tower cranes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194411A (en) * 1962-07-30 1965-07-13 Weitz S A Ets Pivoting tower crane
US3378147A (en) * 1965-11-09 1968-04-16 Boilot Petolat Ets Tower crane rotatable on its base

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987594A (en) * 1975-02-06 1976-10-26 Clark Equipment Company System and method for automatic unstowing and stowing of a crane boom
ITMI20131510A1 (it) * 2013-09-12 2015-03-13 O M V Ohg Vicario S P A Gru auto-montante priva di contrappeso
CN103787205A (zh) * 2014-02-27 2014-05-14 钦州学院 两自由度双闭环混合驱动正面吊运起重机
CN103787205B (zh) * 2014-02-27 2015-11-25 钦州学院 两自由度双闭环混合驱动正面吊运起重机

Also Published As

Publication number Publication date
GB1409373A (en) 1975-10-08
NL7300396A (fr) 1973-07-17
FR2167464B1 (fr) 1974-12-13
DK137376B (da) 1978-02-27
DE2300579A1 (de) 1973-07-19
JPS4881251A (fr) 1973-10-31
IT978010B (it) 1974-09-20
FR2167464A1 (fr) 1973-08-24
DK137376C (fr) 1978-08-07
DE2300579B2 (de) 1976-03-18
BR7300293D0 (pt) 1973-09-25

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