US3871045A - Launcher for extendible and retractable bridge structure - Google Patents

Launcher for extendible and retractable bridge structure Download PDF

Info

Publication number
US3871045A
US3871045A US393610A US39361073A US3871045A US 3871045 A US3871045 A US 3871045A US 393610 A US393610 A US 393610A US 39361073 A US39361073 A US 39361073A US 3871045 A US3871045 A US 3871045A
Authority
US
United States
Prior art keywords
bridge
shaft
launcher
bridge structure
crossbeam
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
US393610A
Other languages
English (en)
Inventor
Claude Bouvet
Michel Eugene Terrien
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.)
REPUBLIC OF FRANCE REPRESENTED
Republic Of France Represented By Minister Of State For National Defense Delegation Ministerielle Pour L'armement Dpaga-Bureau Des Brevets & Inventions
Original Assignee
REPUBLIC OF FRANCE REPRESENTED
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 REPUBLIC OF FRANCE REPRESENTED filed Critical REPUBLIC OF FRANCE REPRESENTED
Application granted granted Critical
Publication of US3871045A publication Critical patent/US3871045A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D15/00—Movable or portable bridges; Floating bridges
    • E01D15/12—Portable or sectional bridges
    • E01D15/127—Portable or sectional bridges combined with ground-supported vehicles for the transport, handling or placing of such bridges or of sections thereof

Definitions

  • ABSTRACT A bridge launcher which may be for example a stationary ground structure or a vehicle has attached thereto a bridge structure movable from a retracted position on the bridge launcher to an extended position at which it bridges a span. Both an end of the bridge structure and an end of a crossbeam are connected to a shaft on the launcher and an extendible element interconnects the end of an arm attached to the crossbeam with a point on the bridge structure close to the shaft.
  • a further extendible element connected at one end to the launcher is operable to raise the bridge structure from its retracted position to a partially raised position at which the center of gravity is over the shaft.
  • a further extension of the first said extendible element will then carry the center of gravity over a vertical plane through the shaft axis.
  • the crossbeam rests against an end wall of the launcher and the first said extendible member forms an adjustable brace for the extended bridge structure.
  • This invention relates to an apparatus for extending a bridge structure articulated at one of its ends about a shaft of a bridge launcher, provided with a device for connection between the launcher and the bridge structure capable of swinging the bridge structure between a retracted, folded position in which it is retracted onto the launcher and an extended position in which it is deployed outside the bridge launcher to bridge a span.
  • the connecting device comprises a crossbeam articulated on the launcher shaft, a positioning mechanism comprising at least one extendible jack joining the end of the crossbeam opposite the shaft to the end of the bridge structure, forming a brace for the bridge structure in its operative extended position, and a drive mechanism comprising at least one extendible jack capable of effecting the swing of the crossbeam-bridge element assembly between a retracted folded position that corresponds to the transport position of the bridge structure and an operative extended position in which the crossbeam is bolted on the launcher.
  • the crossbeam has the form of a U articulated by its base on the launcher shaft, the mechanism for positioning comprising two extendible jacks joined to the ends of the arms of the said U.
  • the drive mechanism comprises a jack connecting the crossbeam to the launcher.
  • This drive mechanism makes it possible to cause the crossbeam-bridge structure assembly to swing until the jack reaches its dead center. Going past this dead center is then effected by shifting the center of gravity of the bridge structure beyond the perpendicular of the articulation shaft of the launcher by supplementary means.
  • the drive mechanism comprises a deployment triangle articulated at one of its apexes on the launcher shaft, its other two apexes being joined by jack drive mechanisms to the launcher and the bridge structure respectively, the said jacks being adaptedto be actuated simultaneously in the same direction.
  • This embodiment is more complex than the former one, but it allows avoidance of the problem of passing beyond the dead center.
  • FIG. 1 shows a side view of the launcher with a connecting device joining it to a bridge structure according to a first embodiment of the invention, the bridge element being retracted onto the launcher.
  • FIG. 2 is a top view of the launcher of FIG. 1.
  • FIG. 3 is a front view of the launcher of FIG. 1.
  • FIGS. 4 to 7 show different stages in the operation of a bridge structure in two folded parts, the launcher having a connecting device as in the first embodiment.
  • FIG. 8 is a side view of the launcher with a connecting device joining it to a bridge element according to a second embodiment of the invention.
  • FIG. 9 is a top view of the launcher of FIG. 8.
  • FIG. 10 is a front view of the launcher of FIG. 8.
  • FIGS. 11 to 14 show different stages in the operation of a bridge structure in two foled parts, the launcher having a connecting device as in the second embodiment.
  • a bridge launcher 1 supports a bridge structure 2 articulated at its end 3 about shaft 4 of the launcher.
  • the launcher has a connecting device 5 that joins it to bridge structure 2.
  • This connecting device is constituted by a crossbeam 6 articulated on shaft 4 of the launcher, a positioning mechanism 7 comprising extendible hydraulic piston and cylinder jacks 8 joining the end of bridge structure 2 to the end of crossbeam 6 that is opposed to shaft 4;
  • a drive mechanism 9 capable of ensuring the swinging of the crossbeam-bridge structure assembly between a position corresponding to the transport position of the element and a position of use, and a bolting device fixed on the front wall of launcher 1.
  • the launcher which is of conventional design may be a stationary support structure such as a bridge piling or a vehicle, either a floating vehicle such as a ferry, an amphibious vehicle, a boat or a pneumatic float.
  • the launcher is shown with wheels bolted in road position. It is apparent that its wheels can be retracted when the launcher is in aquatic use. This possibility is not illustrated, however.
  • the launcher also has a propeller comprising a screw and the drive elements for the said screw. The propeller in the retracted position is indicated with dashed lines in FIGS. 1 and 8.
  • the bridge structure 2 is constituted by two parts 11 and 12 mutually articulated by a hinge that is not illustrated.
  • part 11 which is articulated on shaft 4 is retracted onto the launcher and covered by part 12.
  • part 12 rests on the opposite edge of the span that is to be bridged.
  • the crossbeam 6 has the general configuration of a U whose base is articulated on shaft 4 of the launcher.
  • the said crossbeam is constituted in fact by two bars that are parallel and articulated at one of their ends on the shaft and rigidly joined together by a transverse bar parallel to shaft 4, thus forming a kind of H shaped structure.
  • the positioning mechanism is constituted by two parallel, identical extendible hydraulic piston and cylinder jacks 8 These jacks, articulated at one of their ends on the ends of the crossbeam arms, are articulated at their other ends on part 11 of bridge structure 2.
  • drive mechanism 9 is constituted by an extendible hydraulic piston and cylinderjack l3 joining crossbeam 6 to launcher 1.
  • the said jack is articulated at one of its ends to the middle of the transverse bar joining the arms of the crossbeam, and at its other end on the launcher.
  • the end of the jack disposed on the launcher is thus fixed, and only the end joined to the crossbeam is movable.
  • jack 13 moves in a plane that is equidistant from and parallel to each of the planes described by the two jacks 8 of positioning mechanism 7.
  • the drive mechanism 9 is constituted by an intermediate member in the form of an isosceles deployment triange l4 articulated at its apex on shaft 4 of the launcher and at its two base corners to two jacks and 16.
  • the opposite end of jack 15 is articulated on launcher 1 whereas that of jack 16 is articulated on part 11 of bridge structure 2.
  • triangle 14 is an isosceles triangle.
  • the side of the triangle opposite the apex articulated about shaft 4 of the launcher is perpendicular to jacks l5 and 16.
  • Triangle l4 and jacks l5 and 16 are in the same vertical plane.
  • the end of jack 15 that is located on the launcher is fixed, and only its end joined to triangle 14 is movable.
  • the ends ofjack 16 connected on the one hand to part 11 of the bridge structure and on the other hand to triangle 14 are movable.
  • the assembly constituted by triangle 14 and jacks l5 and 16 describe a plane that is equidistant from and parallel to each of the planes described by the two jacks 8 ofpositioning mechanism 7.
  • FIG. 8 shows that jacks 15 and 16 are parallel to bridge element 2 when said element is in the transport position.
  • FIG. 1 shows that bridge structure 2 is in the transport position and that the parts constituting it are folded one on the other on the launcher.
  • the rods of jacks 8 of the positioning mechanism and that of jack 13 of the drive mechanism are retracted.
  • Crossbeam 6 is then applied against the bridge element.
  • FIG. 4 it is to be seen that the phase of deployment of the bridge element has begun, but that the element is still folded on the launcher.
  • Jack 13 of the drive mechanism has caused crossbeam 6 to pivot slightly, by means of its rod whose elongation is controlled by a known device. During its pivoting, the crossbeam has brought along with it the rods of the jacks of the positioning mechanisms which are able to move freely. It is only when these elements have been sufficiently disengaged that jacks 8 are locked.
  • the deployment of the bridge element has continued.
  • the crossbeam has pivoted further about shaft 4 and the ends of its arms have continued to describe an arc that they started before, to assume the position of FIG. 5.
  • the bridge element is no longer bedded on the launcher because the locked jacks of the positioning mechanism have carried it with them in their motion imposed by the ends of the crossbeam arms.
  • the bridge element has already described a quarter circle and that its center of gravity is on the vertical of shaft 4 of the launcher. Jack 13 is then at its maximal extension and reaches its dead 'point.
  • FIG. 6 it is shown that the center of gravity of the bridge element has moved beyond shaft 4 after opening of its two parts.
  • jack 13 has completed its rotation in the course of which its rod is completely retracted, and that the crossbeam is locked in bolting device 10.
  • the jacks of the positioning mechanism are actuated, said jacks constituting braces. Since the crossbeam is locked, the braces allow a broad sweep of positioning of the element, extending for example between +30 and --20% with reference to the horizontal plane as shown in FIG. 7.
  • the hydraulic locking of these jacks then allowsimmobilizing of the bridge element in its position of use. Because of bolting device 10, the locking of the bridge element on the bridge launcher is realized. All the stresses applied on the bridge element in the course of its use are then transmitted to the launcher. It is obvious that the various operations described above, when executed in reverse directed, effect return of the bridge element to its original position as illustrated in FIG. 1.
  • FIG. 8 the bridge structure is in the folded transport position.
  • the rods of jacks 8 of the positioning mechanisms are retracted while those of jacks and 16 are extended.
  • Crossbeam 6 is applied against the bridge structure while the two apexes of triangle 14, joined to jacks l5 and 16, are in the same vertical plane outside of the launcher, It may be noted in FIG. 11 that the stage of deployment of the bridge structure has begun but that it is still folded onto the launcher, Jacks 8 of the positioning mechanism, brought to maximum extension, have turned crossbeam 6 about shaft 4.
  • jacks 15 and 16 and triangle 1.4 have retained the poisition that they had in FIG. 8. According to FIG.
  • the bridge structure has left its folded retracted position because the rods of jacks I5 and 16 have been retracted after having locked those of jacks 8 in the position of maximum extension. Since one of the ends of jack 15 is articulated on the launcher, the simultaneous retraction of the rods of jacks I5 and 16 forces the deployment-triangle to pivot downward. This pivoting consequently causes the upward pivoting of the bridge structure and allows continuation of that of the crossbeam. The center of gravity of the bridge element is now brought to the vertical.
  • FIG. 14 shows' the bridge structure completely deployed.
  • the crossbeam is at the end of its rotation whereat it is joined fixedly to the launcher by means of bolting device 10.
  • the rods of jacks l5 and 16 of the drive mechanism are returned within their cylinders while jacks 8 of the positioningmechanisms are adjusted to ensure contact of the end of part 12 with the edge of the span being bridged.
  • the positioning mechanism constitutes braces and allows a wide extent of positioning with reference to the horizontal plane. its locking and bolting of the crossbeam also constituting a rigid connection between the bridge structure and the launcher.
  • the lever arms of the jacks of the positioning mechanisms have a significant practically constant value, no matter what the position of the bridge structure. It is likewise to be observed that the stresses borne by the launcher are applied and distributed on the upper and lower parts of its front face, hence in zones that are readily reinforced, and that the stresses in the jacks and in the bridge structure are reduced. It is observed, moreover, that the mass of the connecting device is not great, and that it is possible to reduce still further those of the launcher and the bridge structure because of low stresses transmitted by the jacks when vehicles cross over the bridge.
  • the openings in the bridge structure to allow passage of different organs of the connecting device are smaller, and the grating surface to be placed for operation of the bridge is negligible.
  • the reduced bulk of the connecting device makes it possible to place a propeller in the center of the front wall.
  • the crew then has a good output and allows ready manoeuverability of the launcher.
  • the propeller does not hamper visibility. To be protected, the propeller may even te totally retracted into the front face.
  • a bridge launcher a bridge structure articulated at one of its ends on a shaft-located on the bridge launcher for movement between a retracted position wherein the bridge structure rests on the bridge launcher and an operative extended position wherein the bridge structure is adapted to bridge a span
  • a positioning means including a positioning extendible element interconnecting a first point on the said arm which is spaced away from the shaft to a point on the bridge structure near the end thereof which is articulated on the shaft, said positioning extendible element forming a supporting brace for the bridge structure in the extended position thereof
  • a drive means including at least one drive extendible element for operatively interconnecting the bridge launcher and second point on the said arm between the shaft and the said first point thereon, whereby said drive means is operable, when extended, to move the crossbeam and hence also the bridge structure via said positioning extendible element from said retracted position at least to a partially
  • said crossbeam comprising a pair of parallel arms, one end of each arm being articulated on the shaft, and having a cross bar extending parallel to the shaft and interconnecting the pair of arms, said positioning means including a separate extendible element for each of said arms.
  • said bridge launcher having a vertical end wall, said shaft axis being parallel to and located at the top of said end wall, said crossbeam arm being pivotable about said shaft axis from a position on top of the. bridge launcher in the retracted position to a position against and supported by the said wall in the extended position.
  • said positioning extendible element being adjustable while the crossbeam is supported against and bolted with the said end wall for adjusting the inclination of the extended bridge structure.
  • said bridge launcher being an amphibious vehicle, and including a propeller recessable into said end wall when not in use.
  • a bridge launcher a bridge structure articulated at one of its ends on a shaft located on the bridge launcher for movement between a retracted position wherein the bridge structure rests on the bridge launcher and an operative extended position wherein the bridge structure is adapted to bridge a span
  • a positioning means including a positioning extendible element interconnecting a first point on the said arm which is spaced away from the shaft to a point on the bridge structure near the end thereof which is articulated on the shaft, said positioning extendible element forming a supporting brace for the bridge structure in the extended position thereof
  • a drive means including at least one drive extendible element, said drive extendible element comprising an intermediate member pivotally connected to said shaft for movement in a plane perpendicular to said shaft, two other points on the intermediate member being pivotally connected to first and second extendible members, one of which is connected at its other end to the bridge launcher and the other of which is connected at its other
  • said crossbeam comprising a pair of parallel arms, one end of each arm being articulated on the shaft, and having a cross bar extending parallel to the shaft and interconnecting the pair of arms, said positioning means including a separate extendible element for each of said arms.
  • said bridge launcher having a vertical end wall, said shaft axis being parallel to and located at the top of said end wall, said crossbeam arm being pivotable about said shaft axis from a position on top of the bridge launcher in the retracted position to a position against and supported by the said wall in the extended position.
  • said positioning extendible element being adjustable while the crossbeam is supported against and bolted with the said end wall for adjusting the inclination of the extended bridge structure.
  • said drive means is operable to drive said bridge structure from the retracted position at least to a partially extended position at which the center of gravity of the bridge structure has at least reached a point above the said shaft.
  • a bridge launcher a bridge structure articulated at one of its ends on a shaft located on the bridge launcher for movement between a retracted position wherein the bridge structure rests on the bridge launcher and an operative extended position wherein the bridge structure is adapted to bridge a span
  • a positioning means including a positioning extendible element interconnecting a first point on the said arm which is spaced away from the shaft to a point on the bridge structure near the end thereof which is articulated on the shaft, said positioning extendible element forming a supporting brace for the bridge structure in the extended position thereof
  • a drive means including at least one drive extendible element connected at one end to the bridge launcher, for raising both the bridge and the crossbeam from said retracted position to at least a partially extended position at which the center of gravity of the bridge and crossbeam are generally above the said shaft, and said positioning extendible element is in a position at which a further extension thereof will carry
  • said drive extendible element comprising an intermediate member pivotally connected to said shaft for movement in a plane perpendicular to said shaft, two other points on the intermediate member being pivotally connected to first and second extendible members, one of which is connected at its other end to the bridge launcher and the other of which is connected at its other end to the bridge structure near the shaft, the three said pivotal connections of the intermediate member forming an isosceles triangle with the pivot connection to the shaft being the apex thereof, whereby retracting both of said first and second extendible elements lifts the bridge structure off of the bridge launcher.
  • said bridge launcher having a vertical end wall, said shaft axis being parallel to and located at the top of said end wall, said crossbeam arm being pivotable about said shaft axis from a position on top of the bridge launcher in the retracted position to a position against and supported by the said wall in the extended position.
  • said positioning extendible element being adjustable while the crossbeam is supported against and bolted with the said end wall for adjusting the inclination of the extended bridge structure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Manipulator (AREA)
US393610A 1972-09-28 1973-08-31 Launcher for extendible and retractable bridge structure Expired - Lifetime US3871045A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7234301A FR2200856A5 (de) 1972-09-28 1972-09-28

Publications (1)

Publication Number Publication Date
US3871045A true US3871045A (en) 1975-03-18

Family

ID=9104889

Family Applications (1)

Application Number Title Priority Date Filing Date
US393610A Expired - Lifetime US3871045A (en) 1972-09-28 1973-08-31 Launcher for extendible and retractable bridge structure

Country Status (4)

Country Link
US (1) US3871045A (de)
DE (1) DE2341533C2 (de)
FR (1) FR2200856A5 (de)
GB (1) GB1451332A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023226A (en) * 1974-01-25 1977-05-17 Dr. -Ing. H.C.F. Porsche Aktiengesellschaft Transport vehicle
US4262381A (en) * 1979-11-02 1981-04-21 Blink James A Amphibious vehicle bridge apparatus
US4299002A (en) * 1978-06-08 1981-11-10 Magirus-Deutz Aktiengesellschaft Arrangement for use on a vehicle for transporting portable bridges
US4411037A (en) * 1980-07-28 1983-10-25 Etat Francais Automatic device for lap joint connection on the intrados or extrados of two bridge elements and method for the carrying out thereof
US20050156083A1 (en) * 2003-12-23 2005-07-21 Alcatel Sequencing device for deploying a structure as a function of the kinematics of one mobile body thereof
US20080163439A1 (en) * 2005-01-22 2008-07-10 Volker Green Mobile Bridge System
US20090194499A1 (en) * 2008-02-06 2009-08-06 Lutz Hanselmann Boom of a Laying Mechanism and Method of Moving the Boom into a Vehicle Transport Position

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556175A (en) * 1945-06-12 1951-06-12 Lester P Frost Bridge and mobile launching structure therefor
US3010128A (en) * 1956-06-04 1961-11-28 Gehlen Hermann W Mobile self propelled bridge units
US3208086A (en) * 1961-02-23 1965-09-28 Gillois Jean Mobile and amphibious bridge units
US3305885A (en) * 1962-10-01 1967-02-28 Vaillant Jean Bridge-laying vehicle
US3486180A (en) * 1967-03-31 1969-12-30 Porsche Kg Prefabricated folding bridge transporting and laying vehicle
US3562829A (en) * 1968-03-01 1971-02-16 Porsche Kg Automotive vehicle adapted for transporting and installing a folding bridge
US3597784A (en) * 1969-04-12 1971-08-10 Gehlen Hermann W Vehicle with dismountable ramp
US3754293A (en) * 1970-04-11 1973-08-28 Kloeckner Humboldt Deutz Ag Portable bridge section connection

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1127932B (de) * 1959-07-11 1962-04-19 Beteiligungs & Patentverw Gmbh Einrichtung zum Schwenken eines mit einem zweiten Koerper durch ein Scharniergelenk verbundenen Koerpers, insbesondere von beweglichen Bruecken
FR2015753A1 (de) * 1968-08-16 1970-04-30 Mannesmann Ag

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556175A (en) * 1945-06-12 1951-06-12 Lester P Frost Bridge and mobile launching structure therefor
US3010128A (en) * 1956-06-04 1961-11-28 Gehlen Hermann W Mobile self propelled bridge units
US3208086A (en) * 1961-02-23 1965-09-28 Gillois Jean Mobile and amphibious bridge units
US3305885A (en) * 1962-10-01 1967-02-28 Vaillant Jean Bridge-laying vehicle
US3486180A (en) * 1967-03-31 1969-12-30 Porsche Kg Prefabricated folding bridge transporting and laying vehicle
US3562829A (en) * 1968-03-01 1971-02-16 Porsche Kg Automotive vehicle adapted for transporting and installing a folding bridge
US3597784A (en) * 1969-04-12 1971-08-10 Gehlen Hermann W Vehicle with dismountable ramp
US3754293A (en) * 1970-04-11 1973-08-28 Kloeckner Humboldt Deutz Ag Portable bridge section connection

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023226A (en) * 1974-01-25 1977-05-17 Dr. -Ing. H.C.F. Porsche Aktiengesellschaft Transport vehicle
US4299002A (en) * 1978-06-08 1981-11-10 Magirus-Deutz Aktiengesellschaft Arrangement for use on a vehicle for transporting portable bridges
US4262381A (en) * 1979-11-02 1981-04-21 Blink James A Amphibious vehicle bridge apparatus
US4411037A (en) * 1980-07-28 1983-10-25 Etat Francais Automatic device for lap joint connection on the intrados or extrados of two bridge elements and method for the carrying out thereof
US20050156083A1 (en) * 2003-12-23 2005-07-21 Alcatel Sequencing device for deploying a structure as a function of the kinematics of one mobile body thereof
US7708228B2 (en) * 2003-12-23 2010-05-04 Alcatel Sequencing device for deploying a structure as a function of the kinematics of one mobile body thereof
US20080163439A1 (en) * 2005-01-22 2008-07-10 Volker Green Mobile Bridge System
US7543347B2 (en) * 2005-01-22 2009-06-09 I.C.I. Inter-Commerz Innovationstechnik Gmbh Mobile bridge system
US20090194499A1 (en) * 2008-02-06 2009-08-06 Lutz Hanselmann Boom of a Laying Mechanism and Method of Moving the Boom into a Vehicle Transport Position
US8256052B2 (en) * 2008-02-06 2012-09-04 Krauss-Maffei Wegmann Gmbh & Co. Kg Boom of a laying mechanism and method of moving the boom into a vehicle transport position

Also Published As

Publication number Publication date
FR2200856A5 (de) 1974-04-19
GB1451332A (en) 1976-09-29
DE2341533A1 (de) 1974-04-04
DE2341533C2 (de) 1985-08-29

Similar Documents

Publication Publication Date Title
US5184914A (en) Lift for watercraft
US4305694A (en) Hydraulic tailgate extension, bumper and lock
US4614275A (en) Heavy duty crane
JP2959776B2 (ja) 自動車運搬用トレーラトラック
US4369008A (en) Vehicle transport system
US5014863A (en) Vehicle mounted crane
US3871045A (en) Launcher for extendible and retractable bridge structure
US4150754A (en) Utility crane
CZ300292A3 (en) Automatically foldable jib
US4142640A (en) Device for retracting or extending a movable access ramp
US20090106917A1 (en) System for transporting a span on a road vehicle capable of being transformed into an amphibious vehicle enabling the crossing of a dry or water-filled gap by any road vehicle
US3456769A (en) Transit mixer discharge chute
EP0433356B1 (de) Faltbare transportable brücke
US4142308A (en) Linkage mechanism for digging implement
US4458800A (en) Folding chute linkage assemblies
US3628490A (en) Amphibious vehicle
US2503181A (en) Trussed track tower vehicle
US4498568A (en) Swinging chute linkage assemblies
US4222457A (en) Hydraulic platforms
RU2193007C2 (ru) Складная мачта из трех элементов с устройством складывания и раскладывания для башенного крана
US3173549A (en) Material handling device
US3786953A (en) Loader linkage
US3842933A (en) Aerial platform
US3363944A (en) Elevator mechanism for operating tilting buckets or the like on vehicles
GB2026399A (en) Vehicle more particularly a lorry for transporting a multi-component mobile bridge